CN221099996U

CN221099996U - Sealing performance detection device of switch machine

Info

Publication number: CN221099996U
Application number: CN202322473361.5U
Authority: CN
Inventors: 要海龙; 张振; 孙志源; 李斌; 刁望博; 薛丽丹; 任杰; 朴盛斌; 甄晓光
Original assignee: Tianjin Railway Signal Co Ltd
Current assignee: Tianjin Railway Signal Co Ltd
Priority date: 2023-09-12
Filing date: 2023-09-12
Publication date: 2024-06-07
Anticipated expiration: 2033-09-12

Abstract

The utility model discloses a sealing performance detection device of a switch machine, which comprises a vacuum pump ZKB, a mechanical pressure switch YL, a digital display pressure switch YB and an electrical control module; the air inlet of the vacuum pump ZKB is connected with an inner cavity interface on the switch machine shell to be detected in a sealing way through a hollow connecting pipeline; a mechanical pressure switch YL and a digital display pressure switch YB are arranged on the connecting pipeline; the vacuum pump ZKB is used for enabling the inner cavity of the switch machine shell to form negative pressure; the mechanical pressure switch YL and the digital display pressure switch YB are used for detecting the negative pressure value of the inner cavity of the switch machine shell; the electric control module comprises a direct-current power supply DC, a self-locking button S1 and a vacuum pump ZKB; the positive terminal of the direct current power supply DC is connected with the negative terminal of the direct current power supply DC through the self-locking button S1 and the vacuum pump ZKB. The utility model can efficiently and reliably detect the sealing performance of the switch machine (in particular to a sealed switch machine), and improve the detection efficiency.

Description

Sealing performance detection device of switch machine

Technical Field

The utility model relates to the technical field of railway turnout switching equipment, in particular to a sealing performance detection device of a switch machine, which is applied to the detection of the sealing performance of the sealing switch machine.

Background

The switch machine is an important signal basic device for reliably converting the switch position, changing the switch opening direction, locking the switch tongue, reflecting the switch position and state, and can well ensure the driving safety, improve the transportation efficiency and improve the labor intensity of driving personnel.

In order to extend the service life of the switch machine, sealed switch machines are correspondingly developed. The sealed switch machine is a new product which is improved and upgraded on the basis of the original switch machine, the product can meet the requirement of protection grade IP67, and the sealing performance of the product influences the state of internal parts and the service life of the product.

At present, when the sealing performance of a sealed point switch product is detected, the product is required to be placed into a water tank, and after the product is soaked for a certain time, whether the sealing performance meets the standard is judged by confirming whether water is present in the product. Because the sealed switch is large in size and weight, the existing detection mode is adopted, and the balance crane and the large-sized water tank are needed, so that the detection efficiency is low, and the overall production progress of the product is restricted.

Therefore, there is an urgent need to develop a technique for efficiently and reliably detecting the sealing performance of a switch machine (specifically, a sealed switch machine) and improving the detection efficiency.

Disclosure of utility model

The utility model aims at providing a sealing performance detection device of a switch machine aiming at the technical defects existing in the prior art.

The utility model provides a sealing performance detection device of a switch machine, which comprises a vacuum pump ZKB, a mechanical pressure switch YL, a digital display pressure switch YB and an electrical control module;

the air inlet of the vacuum pump ZKB is connected with an inner cavity interface on the switch machine shell to be detected in a sealing way through a hollow connecting pipeline;

a mechanical pressure switch YL and a digital display pressure switch YB are arranged on the connecting pipeline;

The vacuum pump ZKB is used for pumping out air in the inner cavity of the switch machine shell, so that the inner cavity of the switch machine shell forms negative pressure;

The mechanical pressure switch YL and the digital display pressure switch YB are used for detecting the negative pressure value of the inner cavity of the switch machine shell;

The electric control module comprises a direct-current power supply DC, a self-locking button S1 and a vacuum pump ZKB;

The positive terminal of the direct current power supply DC is connected with the negative terminal of the direct current power supply DC through the self-locking button S1 and the vacuum pump ZKB.

Wherein, two ends of the connecting pipeline are respectively provided with a quick connector;

One of the quick-connection joints is in sealing connection with an inner cavity interface on the switch machine shell to be detected;

And the other quick connector is connected with the air inlet of the vacuum pump ZKB in a sealing way.

The positive electrode end of the direct current power supply DC is connected with the contact 13 of the self-locking button S1;

the contact 14 of the self-locking button S1 is connected with the node M;

The node M is respectively connected with a contact 10 of a time relay KT1, a contact 10 of a time relay KT2, a contact 01 of a digital display pressure switch YB, a contact 14 of an intermediate relay K1, a contact 01 of an indicator lamp 2HL, a contact 14 of the intermediate relay K2, a contact 01 of a vacuum pump ZKB, a contact 01 of an indicator lamp 3HL and a contact 01 of a buzzer HA;

The contact 2 of the time relay KT1, the contact 2 of the time relay KT2 and the contact 04 of the digital display pressure switch YB are converged at a node N;

a contact 13 of the intermediate relay K1 and a contact 02 of the indicator lamp 2HL meet at a node O;

node O is respectively connected with a contact 01 of a mechanical pressure switch YL and a contact 9 of an intermediate relay K1;

Contact 02 of mechanical pressure switch YL and contact 5 of intermediate relay K1 meet at node N;

The contact 13 of the intermediate relay K2 is connected with the contact 02 of the digital display pressure switch YB;

The contact 02 of the vacuum pump ZKB is connected with the contact 8 of the time relay KT 1;

The contact 11 of the time relay KT1 is connected with the contact 11 of the intermediate relay K1;

the contact 3 of the intermediate relay K1 is connected with the node N;

The contact 02 of the indicator lamp 3HL is connected with the contact 9 of the time relay KT 2;

the contact 8 of the time relay KT2 is connected with the node N;

The contact 02 of the buzzer HA is connected with the contact 5 of the time relay KT 2;

The contact 7 of the time relay KT2 is respectively connected with the contact 6 of the time relay KT1 and the contact 6 of the intermediate relay K1;

The contact 5 of the time relay KT1 is connected with the node N;

the contact 10 of the intermediate relay K1 is connected with the contact 03 of the digital display pressure switch YB;

the negative terminal of the direct current power supply DC is connected with the node N.

The electric control module further comprises an indicator lamp 1HL;

The contact 01 of the indicator lamp 1HL is connected with the negative electrode end of the direct current power supply DC;

the contact 02 of the indicator lamp 1HL is connected to the node M.

The contact 13 of the intermediate relay K1 is connected with the contact 9 of the intermediate relay K1 through a wire, and the contact 5 of the intermediate relay K1 is connected with the negative electrode terminal of the direct current power supply DC.

The contact 12 of the intermediate relay K1 is connected with the contact 4 of the time relay KT1 through a wire;

the contact 8 of the intermediate relay K1 is connected to the contact 1 of the time relay KT 1.

The contact 12 of the intermediate relay K2 is connected with the contact 4 of the time relay KT2 through a wire;

The contact 4 of the intermediate relay K2 is connected to the contact 1 of the time relay KT 2.

Wherein, a set pressure parameter value C is preset on the mechanical pressure switch YL;

On the digital display pressure switch YB, preset: setting pressure parameter values D1, D2, E1 and E2;

wherein, the set pressure parameter value C of the mechanical pressure switch YL is less than the set pressure parameter value D1 of the digital display pressure switch YB and less than the set pressure parameter value D2 of the digital display pressure switch YB, and the set pressure parameter value E1 of the digital display pressure switch YB is less than the set pressure parameter value E2 of the digital display pressure switch YB.

Wherein, the time relay KT1 and the time relay KT2 are both power-on time-delay type time relays;

Presetting a set time parameter value A serving as delay time on a time relay KT 1;

A set time parameter value B as a delay time is preset on the time relay KT 2.

Compared with the prior art, the technical scheme provided by the utility model provides the sealing performance detection device for the switch machine, which is scientific in design, can efficiently and reliably detect the sealing performance of the switch machine (particularly the sealing type switch machine), and improves the detection efficiency.

For the utility model, the vacuum pump is utilized to vacuumize the inner cavity of the switch machine, so that the state that the external pressure of the switch machine is relatively higher than the internal pressure when the switch machine is immersed under water is simulated, the device can automatically monitor the change of the pressure of the inner cavity of the switch machine within a set time, and the judgment of whether the sealing performance of the switch machine is qualified or unqualified is given through a pressure feedback signal, thereby having great practical significance.

Drawings

FIG. 1 is a schematic diagram of a gas circuit of a sealing performance detecting device of a switch machine according to the present utility model;

FIG. 2 is a schematic diagram of a control circuit of an embodiment of the sealing performance detecting device of a switch machine according to the present utility model;

FIG. 3 is a schematic diagram of a quick connector assembly in the sealing performance detecting device of a switch machine according to the present utility model;

Fig. 4 is a schematic structural view of a quick connector in the sealing performance detecting device of a switch machine according to the present utility model;

Fig. 5a is a schematic diagram of self-wiring of a time relay KT1 in the sealing performance detecting device of a switch machine provided by the utility model;

Fig. 5b is a schematic diagram of self-wiring of the time relay KT2 in the sealing performance detecting device of the switch machine provided by the utility model;

Fig. 6 is a schematic diagram of self-wiring of an intermediate relay K1 in the sealing performance detecting device of a switch machine according to the present utility model; self-wiring schematic diagram of intermediate relay K2; the self wiring schematic diagram is the same as that of the intermediate relay K1;

Fig. 7 is a schematic circuit wiring diagram of a digital display pressure switch YB in the sealing performance detection device of a switch machine provided by the utility model;

Fig. 8 is a schematic circuit control diagram of the sealing performance detection device of the switch machine after the self-locking button S1 is pressed;

Fig. 9 is a schematic circuit diagram of a sealing performance detecting device for a switch machine according to the present utility model, wherein the circuit control is shown when the pressure in the inner cavity of the switch machine reaches the set pressure parameter value C of the mechanical pressure switch YL, and the required vacuum pumping time is greater than or equal to the set time parameter value a of the time relay KT 1;

fig. 10 is a schematic diagram of circuit control when the pressure in the inner cavity of the switch reaches the set pressure parameter value C of the mechanical pressure switch YL and the required vacuum pumping duration is less than the set time parameter value a of the time relay KT1 in the sealing performance detection device of the switch provided by the utility model;

Fig. 11 is a schematic diagram illustrating circuit control when the negative pressure in the inner cavity of the switch casing is higher than the set pressure parameter value D1 of the digital display pressure switch YB in the sealing performance detecting device of the switch provided by the utility model;

Fig. 12 is a schematic circuit control diagram of the sealing performance detecting device of the switch machine according to the present utility model when the time relay KT2 counts to the set time parameter value B.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "disposed" are to be construed broadly, and may be, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 to 4, 5a to 5b, and 6 to 12, the present utility model provides a sealing performance detecting device for a switch machine, which is applied to the sealing performance detection of the sealing switch machine, and comprises a vacuum pump (ZKB) 4, a mechanical pressure switch (YL) 2, and a digital display pressure switch (YB) 3;

An air inlet of a vacuum pump (ZKB) 4 is in sealing connection with an inner cavity interface on a casing of the switch machine 1 to be detected (in particular a sealed switch machine) through a hollow connecting pipeline;

A mechanical pressure switch (YL) 2 and a digital display pressure switch (YB) 3 are arranged on the connecting pipeline;

A vacuum pump (ZKB) 4 for pumping out air in the inner cavity of the switch machine housing so that the inner cavity of the switch machine housing forms negative pressure;

In the inner cavity of the switch machine housing, various parts necessary for the function of the switch machine are mounted.

The mechanical pressure switch YL and the digital display pressure switch YB are used for detecting the negative pressure value of the inner cavity of the switch machine shell.

In the utility model, in particular implementation, two ends of the connecting pipeline are respectively provided with a quick connector 5;

One of the quick-connect connectors 5 is in sealing connection with an inner cavity interface on a casing of the switch machine (in particular a sealed switch machine) to be detected;

And the other quick connector 5 is connected with the air inlet of the vacuum pump ZKB in a sealing way.

In the concrete implementation, the air passage interface (i.e. air inlet) of the mechanical pressure switch YL and the air passage interface (i.e. air inlet) of the digital display pressure switch YB are respectively communicated with the connecting pipelines. It should be noted that, the installation manner of the mechanical pressure switch YL and the digital display pressure switch YB is a conventional manner known in the prior art, and will not be described herein.

As shown in fig. 3, the quick connector 5 has an inner hole penetrating in the axial direction, and two grooves are provided on the outer side in the circumferential direction for mounting two seal rings.

It should be noted that, the quick connector, i.e. the quick connector, is a connector capable of realizing connection or disconnection of a pipeline without tools, and is a well-known connector in the prior art, and is not described herein.

In the specific implementation of the utility model, the sealing performance detection device of the switch machine further comprises an electrical control module;

The positive terminal of the direct current power supply DC is connected (specifically, may be indirectly connected) with the negative terminal of the direct current power supply DC through the self-locking button S1 and the vacuum pump ZKB.

In the concrete implementation, the positive electrode end of the direct current power supply DC is connected with the contact 13 of the self-locking button S1;

the contact 14 of the self-locking button S1 is connected with the node M;

the contact 3 of the intermediate relay K1 is connected with the node N;

the contact 8 of the time relay KT2 is connected with the node N;

The contact 5 of the time relay KT1 is connected with the node N;

In particular, the direct current power supply DC is a 24V direct current power supply, for example a 24V direct current battery.

In the concrete implementation, the electric control module further comprises an indicator lamp 1HL;

the contact 02 of the indicator lamp 1HL is connected to the node M.

The 24V DC battery dc+ is connected to the contact 13 of the self-locking button S1 via a wire, the contact 14 of the self-locking button S1 is connected to the contact 02 of the indicator lamp 1HL, and the contact 01 of the indicator lamp 1HL is connected to the DC of the 24V DC battery. At the moment, the self-locking button S1 is pressed, the indicator lamp 1HL is lightened, and power supply of the system is represented;

after the self-locking button S1 is pressed, two ends (namely contacts 01 and 04) of the digital display pressure switch YB are powered to start working;

In the present utility model, it should be noted that, in the present utility model, the contact 14 of the self-locking button S1 is connected to the contact 01 of the indicator lamp 2HL through a wire, and the contact 02 of the indicator lamp 2HL is connected to the contact 13 of the intermediate relay K1;

The contact 14 of the self-locking button S1 is connected with the contact 01 of the indicator lamp 3HL by a wire, the contact 02 of the indicator lamp 3HL is connected with the contact 9 of the time relay KT2, and the contact 8 of the time relay KT2 is connected with the negative terminal of the current source DC (for example, 24V direct current battery).

In the present utility model, the buzzer HA includes a contact 01 and a contact 02; the contact 14 of the self-locking button S1 is connected with the contact 01 of the buzzer HA through a wire, the contact 02 of the buzzer HA is connected with the contact 5 of the time relay KT2, the contact 7 of the time relay KT2 is connected with the contact 6 of the time relay KT1, and the contact 5 of the time relay KT1 is connected with the negative electrode end of a direct current power supply DC (for example, a 24V direct current battery); the contact 7 of the time relay KT2 is connected with the contact of the intermediate relay K1, and the contact 10 of the intermediate relay K1 is connected with the contact 03 of the digital display pressure switch YB.

In order to more clearly understand the present utility model, the technical principle and the working mechanism of the self-locking button S1 are explained below.

In the present utility model, the self-locking button S1 is a mature device in the prior art, for example, a self-locking button manufactured by zhengtai group company and having a model of LAY39B (LA 38) -11BN may be used, and the function of the self-locking button S1 in the present utility model is to switch on or off the dc power supply of the sealing performance detecting device of the present utility model.

Wherein, the contact 13 and the contact 14 of the self-locking button S1 are normally open contacts;

The working principle of the self-locking button S1 is as follows: after the hands are loosened by pressing, the button is kept by a self-locking mechanism, and the contact 13 and the contact 14 of the self-locking button S1 can be closed, at the moment, the self-locking button S1 is used for starting a direct current power supply of the sealing performance detection device; after the release of the hand is again pressed, the self-locking mechanism of the button is disconnected, and the contact 13 and the contact 14 of the self-locking button S1 are disconnected, so that the direct-current power supply of the sealing performance detection device is turned off.

In the utility model, a set pressure parameter value C (-10.5 Kpa) is preset on a mechanical pressure switch YL;

On the digital display pressure switch YB, preset: setting four parameter values of pressure parameter values D1 (-10 Kpa), D2 (-9.8 Kpa), E1 (-9.7 Kpa) and E2 (0 Kpa);

Wherein, the set pressure parameter value C of the mechanical pressure switch YL < the set pressure parameter value D1 of the digital display pressure switch YB < the set pressure parameter value D2 of the digital display pressure switch YB < the set pressure parameter value E1 of the digital display pressure switch YB (E1 is equal to D2+0.1Kpa for example) < the set pressure parameter value E2 of the digital display pressure switch YB (0 Kpa).

In the utility model, for the digital display pressure switch YB, the set pressure parameter values D1 (-10 Kpa), D2 (-9.8 Kpa) and E1 (-9.7 Kpa) and E2 (0 Kpa) of the digital display pressure switch YB are all parameter values set for detecting the change of the pressure in the inner cavity of the switch machine shell;

Wherein, the set pressure parameter values D1 (-10 Kpa) and D2 (-9.8 Kpa) respectively show the working intervals of the contact 02 and the contact 04 of the pressure switch YB;

the set parameter values E1 (-9.7 Kpa) and E2 (0 Kpa) are respectively the working intervals of the contact 03 and the contact 04 of the digital display pressure switch YB.

When the set pressure parameter value D1 (-10 Kpa) is less than the pressure of the inner cavity of the switch machine shell and less than or equal to D2 (-9.8 Kpa), the contact 02 and the contact 04 of the digital display pressure switch YB are closed;

When the pressure in the inner cavity of the switch machine shell is less than or equal to D1 (-10 Kpa) or more than D2 (-9.8 Kpa), the contact 02 and the contact 04 of the digital display pressure switch YB are disconnected.

When the set pressure parameter value E1 (-9.7 Kpa) < the pressure in the inner cavity of the switch machine shell is less than or equal to E2 (0 Kpa), the contact 03 and the contact 04 of the digital display pressure switch YB are closed;

When the pressure in the inner cavity of the switch machine shell is less than or equal to E1 (-9.7 Kpa) or more than E2 (0 Kpa), the contact 03 and the contact 04 of the digital display pressure switch YB are disconnected.

In the present utility model, the set time parameter value a of the time relay KT1 is used as a standard time for the vacuum pump ZKB to pump the switch machine housing inner cavity pressure to the set pressure parameter value C of the mechanical pressure switch YL.

The function of the set time parameter value A is: the method comprises the steps of comparing actual time for a vacuum pump ZKB to pump the pressure in the inner cavity of a switch machine shell to a set pressure parameter value C of a mechanical pressure switch YL, closing a time delay contact 5 and a contact 6 (namely time delay movable contact) of a time relay KT1 if the actual time is more than or equal to standard time, switching on a working circuit of a buzzer HA, and giving an alarm by using a buzzer HA flash lamp;

If the actual time is less than the standard time, as the pressure in the inner cavity of the switch machine shell reaches the set pressure parameter value C of the mechanical pressure switch YL, the contact 01 and the contact 02 of the mechanical pressure switch YL are closed, the working circuit of the indicator lamp 2HL is connected, and the indicator lamp 2HL is lighted.

In the utility model, a set time parameter value B of a time relay KT2 is used for representing the time for monitoring the negative pressure change of the inner cavity of the switch machine shell.

The main functions of the set time parameter value B are as follows: and comparing the time when the negative pressure of the inner cavity of the switch machine shell is changed from the set pressure parameter value D1 to the set pressure parameter value D2.

If the time for changing the negative pressure of the inner cavity of the switch machine shell from D1 to D2 is smaller than the set time parameter value B of the time relay KT2, the buzzer HA flashes to alarm;

If the time for changing the negative pressure of the inner cavity of the switch machine shell from D1 to D2 is more than or equal to the set time parameter value B of the time relay KT2, the indicator lamp 3HL is lighted.

In the present utility model, in particular implementation, the time relay KT1 includes contacts (also called mounting terminals) 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11;

The time relay KT2 includes contacts (also called mounting terminals) 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11;

in the concrete implementation, the time relay KT1 and the time relay KT2 are both power-on time-delay type time relays.

It should be noted that, for the time relay of the power-on delay type, when the coil is powered on, the delay moving contact is closed only after a certain time delay, and the delay moving contact is opened only after a certain time delay. When the coil is powered off, the delay moving contact is quickly opened, and the delay moving contact is quickly closed.

Wherein, on the time relay KT1, a set time parameter value a (i.e., delay time) as delay time is preset, and on the time relay KT2, a set time parameter value B (i.e., delay time) as delay time is preset.

In order to more clearly understand the present utility model, the technical principle and the working mechanism of the time relay KT1 are explained below.

In the utility model, the time relay KT1 and the time relay KT2 are the same in type selection and the same in working principle. Fig. 5a is a schematic diagram of the self-wiring of the time relay KT1, and contacts of the time relay KT1 and the time relay KT2 are both in fig. 2.

In the utility model, the time relay KT1 is used as the existing electrical element, and the ZYS48-A type time relay which is produced by Shanghai Zuo-electronic limited company and can be provided with a delay value can be used for making a delay element in a control circuit and switching on or switching off the circuit according to the preset time.

The time relay KT1 is mainly used for comparing the set time parameter value A with the actual time of the vacuum pump ZKB for pumping the pressure in the inner cavity of the switch machine shell to the set pressure parameter value C of the mechanical pressure switch YL, and controlling the working circuits of the buzzer HA and the vacuum pump ZKB through the connection or disconnection of the contacts of the time relay KT 1.

In the concrete implementation, for a time relay KT1, a contact 5, a contact 6 and a contact 7 of the time relay KT1 are a group of time delay switches, wherein the contact 5 is a movable contact, the contact 6 is a normally open contact, and the contact 7 is a normally closed contact; the contact 8, the contact 9 and the contact 11 of the time relay KT1 are a group of time delay switches, wherein the contact 8 is a movable contact, the contact 9 is a normally open contact, and the contact 11 is a normally closed contact; the contact 10 and the contact 2 of the time relay KT1 are power supply connection contacts; the contact 1 of the time relay KT1 is a common contact; the contact 3 of the time relay KT1 is a reset contact; the contact 4 of the time relay KT1 is a pause contact;

The working principle of the time relay KT1 is as follows: a time A (namely a set time parameter value A) is preset for the time relay KT1, after the time relay KT1 is electrified, the time of the time relay KT1 starts to be counted, when the time A is counted, the normally open contact 6 and the contact 5 of the time relay KT1 are closed and are closed, the normally closed contact 7 and the contact 5 are opened, the normally open contact 9 and the contact 8 of the time relay KT1 are closed, and the normally closed contact 11 and the contact 9 are opened; in the time A of the time relay KT1, if the pause contact 4 and the contact 1 of the time relay KT1 are switched on, the time relay KT1 stops timing, and at the moment, the normally open contact and the normally closed contact of the time relay KT1 are in an initial state, namely the normally open contact 6 and the contact 5 are normally open, the normally closed contact 7 and the contact 5 are closed, and the normally open contact 9 and the contact 8 of the time relay KT1 are normally open, and the normally closed contact 11 and the contact 9 are closed; if reset contact 3 and contact 1 of time relay KT1 are turned on, time relay KT1 restarts timing.

In the utility model, the normally open contact 6 and the contact 5 of the time relay KT1 are applied, and the normally open contact 6 and the contact 5 of the time relay KT1 are in an open state when the time relay KT1 is in an initial state. In the utility model, a normally open contact 6 and a contact 5 of a time relay KT1 are connected in series in a working circuit of a buzzer HA, if the pressure of the inner cavity of a shell of the switch machine reaches (i.e. is greater than or equal to) the vacuum pumping time length (i.e. the actual time) required by a set pressure parameter value C of a mechanical pressure switch YL, the time relay KT1 is firstly timed to the A time when the vacuum pumping time length is greater than or equal to a set time parameter value A (i.e. standard time) of the time relay KT1, and when the time relay KT1 is timed to the A time, the normally open contact 6 and the contact 5 of the time relay KT1 are closed.

In the utility model, the normally-closed contact 11 and the contact 8 of the time relay KT1 are applied, and the normally-closed contact 11 and the contact 8 of the time relay KT1 are in a closed state when the time relay KT1 is in an initial state. In the utility model, a normally closed contact 11 and a contact 8 of a time relay KT1 are connected in series in a working circuit of a vacuum pump ZKB, if the pressure in the inner cavity of a switch machine shell reaches (i.e. is greater than or equal to) the vacuum pumping time length (i.e. the actual time) required by a set pressure parameter value C of a mechanical pressure switch YL, the time relay KT1 firstly counts to the time A when the pressure is greater than or equal to a set time parameter value A (i.e. standard time) of the time relay KT1, and when the time relay KT1 counts to the time A, the normally closed contact 11 and the contact 8 of the time relay KT1 are disconnected, and the vacuum pump ZKB stops working.

In the utility model, a pause contact 4 and a contact 1 of a time relay KT1 are used, the pause contact 4 of the time relay KT1 is connected with a movable contact 12 of an intermediate relay K1, and the contact 1 of the time relay KT1 is connected with a normally open contact 8 of the intermediate relay K1. In the utility model, the pause contact 4 and the contact 1 of the time relay KT1 are used for controlling the operation of the time relay KT1, after the intermediate relay K1 is electrified, the normally open contact 8 and the movable contact 12 of the intermediate relay K1 are closed, the pause contact 4 and the contact 1 of the time relay KT1 are connected, and the time relay KT1 stops timing; when the intermediate relay K1 is powered off, the normally open contact 8 and the movable contact 12 of the intermediate relay K1 are disconnected, the pause contact 4 and the contact 1 of the time relay KT1 are disconnected, and the time relay KT1 starts to count time;

In the present utility model, the power sources mentioned refer to the DC24V direct current power source in fig. 2.

In order to more clearly understand the present utility model, the technical principle and the working mechanism of the time relay KT2 are explained below.

In the utility model, the time relay KT2 is used as the existing electrical element, and the ZYS48-A type time relay which is produced by Shanghai Zuo-electronic limited company and can be provided with a delay value can be used for making a delay element in a control circuit and switching on or switching off the circuit according to the preset time.

The time relay KT2 is mainly used for comparing the set time parameter value B with the time of changing the negative pressure of the inner cavity of the switch machine shell from D1 to D2, and controlling the working circuits of the buzzer HA and the indicator lamp 3HL through the connection or disconnection of the contacts of the time relay KT 2.

In the concrete implementation, for a time relay KT2, a contact 5, a contact 6 and a contact 7 of the time relay KT2 are a group of time delay switches, wherein the contact 5 is a movable contact, the contact 6 is a normally open contact, and the contact 7 is a normally closed contact; the contact 8, the contact 9 and the contact 11 of the time relay KT2 are a group of time delay switches, wherein the contact 8 is a movable contact, the contact 9 is a normally open contact, and the contact 11 is a normally closed contact; the contact 10 and the contact 2 of the time relay KT2 are power supply connection contacts; the contact 1 of the time relay KT2 is a common contact; the contact 3 of the time relay KT2 is a reset contact; the contact 4 of the time relay KT2 is a pause contact.

The working principle of the time relay KT2 is as follows: a time B is preset for the time relay KT2 (namely, a time parameter value B is set), when the time relay KT2 times to the time B, a normally open contact 6 and a contact 5 of the time relay KT2 are closed and are closed, a normally closed contact 7 and a contact 5 are opened, a normally open contact 9 and a contact 8 of the time relay KT2 are closed, and a normally closed contact 11 and a contact 9 are opened; in the time B of the time relay KT2, if the pause contact 4 and the contact 1 are switched on, the time relay KT2 stops timing, and at the moment, the normally open contact and the normally closed contact of the time relay KT2 are in an initial state, namely the normally open contact 6 and the contact 5 are normally open, the normally closed contact 7 and the contact 5 are closed, and the normally open contact 9 and the contact 8 of the time relay KT2 are normally open, and the normally closed contact 11 and the contact 9 are closed; if reset contact 3 and contact 1 are closed, time relay KT2 restarts counting.

In the utility model, the reset contact 3, the normally open contact 6 and the normally closed contact 11 of the time relay KT2 are empty.

In the utility model, a pause contact 4 and a contact 1 of a time relay KT2 are used, the pause contact 4 of the time relay KT2 is connected with a movable contact 12 of an intermediate relay K2, and the contact 1 of the time relay KT2 is connected with a normally closed contact 4 of the intermediate relay K2. In the initial state, the intermediate relay K2 does not work, the normally closed contact 4 and the east contact 12 of the intermediate relay K2 are closed, the pause contact 4 and the contact 1 of the time relay KT2 are turned on, and the time of the time relay KT2 is not counted after being electrified. When the negative pressure of the inner cavity of the switch machine shell is higher than the set pressure parameter value D1 of the digital display pressure switch YB, the contact 02 of the digital display pressure switch YB is connected with the contact 04 of the digital display pressure switch YB through the main circuit of the digital display pressure switch YB, the working circuit of the time relay K2 is connected, the normally closed contact 4 and the movable contact 12 of the intermediate relay K2 are disconnected, the pause contact 4 and the contact 1 of the time relay KT2 are disconnected, and the time relay KT2 starts to count time.

In the utility model, a normally open contact 9 and a normally open contact 8 of a time relay KT2 are applied, and when the time relay KT2 is in an initial state, the normally open contact 9 and the normally open contact 8 of the time relay KT2 are in an open state. In the utility model, a normally open contact 9 and a contact 8 of a time relay KT2 are connected in series in a working circuit of an indicator lamp 3 HL. When the time relay KT2 times to the time of the parameter B, the normally open contact 9 and the contact 8 of the time relay KT2 are closed, the working circuit of the indicator lamp 3HL is switched on, and the indicator lamp 3HL is lighted.

In the utility model, a normally closed contact 7 and a normally closed contact 5 of a time relay KT2 are applied, and when the time relay KT2 is in an initial state, the normally closed contact 7 and the normally closed contact 5 of the time relay KT2 are in a closed state; when the time relay KT2 times to the time of the parameter B, the normally closed contact 7 and the contact 5 of the time relay KT2 are disconnected, and the working circuit of the buzzer HA is disconnected.

The time relay KT1 and the time relay KT2 are the same in type selection and the same in working principle. Fig. 5a and 5b are schematic diagrams of self-wiring of the time relay KT1 and the time relay KT2, respectively, and contacts wired to the time relay KT1 and the time relay KT2 are shown in fig. 2.

In the present utility model, in particular implementation, the intermediate relay K1 comprises contacts (also called mounting terminals) 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 and 14;

The intermediate relay K2 includes contacts (also called mounting terminals) 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14;

In particular, as shown in fig. 2, contact 13 of intermediate relay K1 is connected to contact 9 of intermediate relay K1 by a wire, and contact 5 of intermediate relay K1 is connected to the negative terminal of direct current power supply DC (for example, 24V direct current battery).

In particular, as shown in fig. 2, the contact 12 of the intermediate relay K1 is connected to the contact 4 of the time relay KT1 by a wire;

In particular, as shown in fig. 2, the contact 12 of the intermediate relay K2 is connected to the contact 4 of the time relay KT2 by a wire;

In order to understand the present utility model more clearly, the technical principle and the operation mechanism of the intermediate relay K1 will be explained below.

In the utility model, the intermediate relay K1 is used as the existing electrical element, and can be a model JZX-22F (D)/4Z intermediate relay with a lamp 14 pin, which is produced by Zhengtai group Co., ltd, and is used in a control circuit to control the operation of the vacuum pump ZKB, the buzzer HA and the time relay KT1 mainly through normally open and normally closed contacts thereof.

In particular, for the intermediate relay K1, the intermediate relay K1 has four sets of contact switches. The contact 1, the contact 5 and the contact 9 of the intermediate relay K1 are contact switches, the contact 1 is a normally closed contact, the contact 5 is a normally open contact and the contact 9 is a movable contact; the contact 2, the contact 6 and the contact 10 of the intermediate relay K1 are contact switches, the contact 2 is a normally closed contact, the contact 6 is a normally open contact and the contact 10 is a movable contact; the contact 3, the contact 7 and the contact 11 of the intermediate relay K1 are contact switches, the contact 3 is a normally closed contact, the contact 7 is a normally open contact and the contact 11 is a movable contact; the contact 4, the contact 8 and the contact 12 of the intermediate relay K1 are contact switches, the contact 4 is a normally closed contact, the contact 8 is a normally open contact and the contact 12 is a movable contact; the contact 13 and the contact 14 of the intermediate relay K1 are coil outputs of the intermediate relay K1.

When the contact 14 and the contact 13 of the intermediate relay K1 are powered on, the coil is electrified, the intermediate relay K1 starts to work, and the movable iron core is attracted under the action of electromagnetic force, so that the movable contact 9 and the normally open contact 5 of the intermediate relay K1 are closed, the movable contact 10 and the normally open contact 6 are closed, the movable contact 11 and the normally open contact 7 are closed, the movable contact 12 and the normally open contact 8 are closed, the movable contact 9 and the normally closed contact 1 are disconnected, the movable contact and the normally closed contact 2 are disconnected, the movable contact 11 and the normally closed contact 3 are disconnected, and the movable contact 12 and the normally closed contact 4 are disconnected;

In the utility model, the normally closed contact 1, the normally closed contact 2, the normally open contact 7 and the normally open contact 4 of the intermediate relay K1 are empty.

In the utility model, the normally open contact 5 and the contact 9 of the intermediate relay K1 are applied, and the normally open contact 5 and the contact 9 of the intermediate relay K2 are connected into a self-locking loop of the intermediate relay K1. When the intermediate relay K1 is electrified to work, the normally open contact 5 and the contact 9 of the intermediate relay K2 are closed, and the working circuit of the intermediate relay K1 is self-locked. When the intermediate relay K1 is powered off, the normally open contact 5 of the intermediate relay K2 is disconnected from the contact 9.

In the utility model, the normally closed contact 3 and the contact 11 of the intermediate relay K1 are applied, and the normally closed contact 3 and the contact 11 of the intermediate relay K1 are connected in series in a working circuit of the vacuum pump ZKB. In the initial state, the normally closed contact 3 and the contact 11 of the intermediate relay K1 are closed, when the pressure in the inner cavity of the shell of the switch machine reaches (i.e. is greater than or equal to) the set pressure parameter value C of the mechanical pressure switch YL, the contact 01 and the contact 02 of the mechanical pressure switch YL are closed, the working circuit of the intermediate relay K1 is switched on, the armature of the intermediate relay K1 is sucked up, the normally closed contact 3 and the contact 11 of the intermediate relay K1 are opened, and the working circuit of the vacuum pump ZKB is disconnected.

In the utility model, the normally open contact 6 and the contact 10 of the intermediate relay K1 are applied, and the normally open contact 6 and the contact 10 of the intermediate relay K1 are connected in series in the working circuit of the buzzer HA. In the initial state, the normally open contact 6 and the contact 10 of the intermediate relay K1 are disconnected, when the pressure in the inner cavity of the shell of the switch machine reaches (i.e. is greater than or equal to) the set pressure parameter value C of the mechanical pressure switch YL, the contact 01 and the contact 02 of the mechanical pressure switch YL are closed, the working circuit of the intermediate relay K1 is switched on, the armature of the intermediate relay K1 is sucked up, the normally open contact 6 and the contact 10 of the intermediate relay K1 are closed, and the working circuit of the buzzer HA is switched on.

In the utility model, a normally open contact 8 and a contact 12 of the intermediate relay K1 are applied, and the normally open contact 8 and the contact 12 of the intermediate relay K1 are respectively connected with a pause contact 4 of the time relay KT1 and a contact 1 of the time relay KT 1. In the initial state, the normally open contact 8 and the contact 12 of the intermediate relay K1 are disconnected, when the pressure in the inner cavity of the shell of the switch machine reaches (i.e. is greater than or equal to) the set pressure parameter value C of the mechanical pressure switch YL, the contact 01 and the contact 02 of the mechanical pressure switch YL are closed, the working circuit of the intermediate relay K1 is switched on, the armature of the intermediate relay K1 is sucked up, the normally open contact 8 and the contact 12 of the intermediate relay K1 are closed, the pause contact 4 and the contact 1 of the time relay KT1 are switched on, and the pause timing of the intermediate relay KT1 is performed.

It should be noted that fig. 6 only shows the wiring description of the intermediate relay itself, the contacts connected with the intermediate relay are all shown in fig. 2, and the electronic components such as resistors and the like appearing in fig. 6 belong to the electronic components inside the intermediate relay, and in the present utility model, the connection is not needed again, and the description is omitted here.

In order to understand the utility model more clearly, the technical principle and the working mechanism of the intermediate relay K2 are explained below.

In the utility model, the intermediate relay K2 is used as the existing electrical element, and the model JZX-22F (D)/4Z intermediate relay with a lamp 14 pin, which is produced by Zhengtai group Co., ltd, can be used in a control circuit, and the work of the time relay KT2 is controlled mainly through normally open and normally closed contacts.

In particular, for the intermediate relay K2, the intermediate relay K2 has four sets of contact switches. The contact 1, the contact 5 and the contact 9 of the intermediate relay K2 are contact switches, the contact 1 is a normally closed contact, the contact 5 is a normally open contact and the contact 9 is a movable contact; the contact 2, the contact 6 and the contact 10 of the intermediate relay K2 are contact switches, the contact 2 is a normally closed contact, the contact 6 is a normally open contact and the contact 10 is a movable contact; the contact 3, the contact 7 and the contact 11 of the intermediate relay K2 are contact switches, the contact 3 is a normally closed contact, the contact 7 is a normally open contact and the contact 11 is a movable contact; the contact 4, the contact 8 and the contact 12 of the intermediate relay K2 are contact switches, the contact 4 is a normally closed contact, the contact 8 is a normally open contact and the contact 12 is a movable contact; the contact 13 and the contact 14 of the intermediate relay K2 are coil outputs of the intermediate relay K1.

When the contact 14 and the contact 13 of the intermediate relay K2 are powered on, the coil is electrified, the intermediate relay K2 starts to work, and the movable iron core is attracted under the action of electromagnetic force, so that the movable contact 9 and the normally open contact 5 of the intermediate relay K2 are closed, the movable contact 10 and the normally open contact 6 are closed, the movable contact 11 and the normally open contact 7 are closed, the movable contact 12 and the normally open contact 8 are closed, the movable contact 9 and the normally closed contact 1 are disconnected, the movable contact and the normally closed contact 2 are disconnected, the movable contact 11 and the normally closed contact 3 are disconnected, and the movable contact 12 and the normally closed contact 4 are disconnected;

In the utility model, only the normally closed contact 12 and the contact 4 of the intermediate relay K2 are used, and the rest of the contacts are left empty.

In the utility model, the normally closed contact 8 and the contact 12 of the intermediate relay K2 are respectively connected with the pause contact 4 of the time relay KT2 and the contact 1 of the time relay KT 2. In the initial state, the normally closed contact 8 and the contact 12 of the intermediate relay K1 are closed, the pause contact 4 of the time relay KT2 and the contact 1 of the time relay KT2 are closed, and the time relay KT2 is not timed. When the negative pressure of the inner cavity of the casing of the switch machine is higher than the set pressure parameter value D1 of the digital display pressure switch YB, the contact 02 of the digital display pressure switch YB is connected with the contact 04 of the digital display pressure switch YB through the main circuit of the digital display pressure switch YB, the working circuit of the intermediate relay K2 is connected, the armature of the intermediate relay K2 is sucked up, the normally closed contact 4 and the contact 12 of the intermediate relay K2 are disconnected, the pause contact 4 of the time relay KT2 and the contact 1 of the time relay KT2 are disconnected, and the time of the intermediate relay KT2 is started.

When the negative pressure of the inner cavity of the casing of the switch machine is changed from the set pressure parameter value D1 of the digital display pressure switch YB to be higher than the set pressure parameter value D2 of the digital display pressure switch YB or equal to the set pressure parameter value E1 of the digital display pressure switch YB, the contact 02 of the digital display pressure switch YB is disconnected with the contact 04 of the digital display pressure switch YB through the main circuit of the digital display pressure switch YB, the working circuit of the intermediate relay K2 is disconnected, the armature of the intermediate relay K2 is reset, the normally closed contact 4 and the contact 12 of the intermediate relay K2 are closed, and the time relay KT2 stops timing.

In order to understand the utility model more clearly, the technical principle and the working mechanism of the mechanical pressure switch YL will be explained below.

In the utility model, the mechanical pressure switch YL is a mature device in the prior art, for example, a mechanical pressure switch which is produced by Zhejiang all-Yao electric technology Co., ltd and is of the model SZM-V16-FC-91 can be adopted, and the function of the mechanical pressure switch YL is to disconnect a working circuit of the vacuum pump ZKB when the negative pressure of the inner cavity of the switch machine shell reaches a set pressure parameter value C, so that the vacuum pump ZKB stops working.

The connection terminal (i.e. contact) 01 and the connection terminal (i.e. contact) 02 of the mechanical pressure switch YL are normally open contacts, and the working principle is as follows: when the pressure is increased, the membrane inside the switch deforms, and when the pressure reaches a set value, the membrane drives the wiring terminal (i.e. the contact) 01 and the wiring terminal (i.e. the contact) 02 through the pull rod.

In the present utility model, referring to fig. 2, when the switch machine housing inner cavity pressure reaches the mechanical pressure switch YL set pressure parameter value C, the contact 01 and the contact 02 of the mechanical pressure switch YL are closed, thereby completing the operation circuit of the intermediate relay K1 (i.e., completing the contact 9 and the contact 5 of the intermediate relay K1 so that the contact 9 and the contact 5 are electrically connected) and the operation circuit of the indicator lamp 2 HL. When the switch machine housing cavity pressure is less than the set pressure parameter value C of the mechanical pressure switch YL, the contacts 01 and 02 of the mechanical pressure switch YL are open.

The set pressure parameter value C of the mechanical pressure switch YL is: the pressure in the inner cavity of the switch machine shell is pumped to a set value through a vacuum pump ZKB, and the set value has the functions of: when the pressure in the inner cavity of the switch machine shell is pumped to a set value, the diaphragm in the mechanical pressure switch YL deforms, so that the contact 01 and the contact 02 of the mechanical pressure switch YL are closed, and the switch is used for switching on the working circuit of the intermediate relay K1 (namely switching on the contact 9 and the contact 5 of the intermediate relay K1, so that the contact 9 and the contact 5 are electrified) and the working circuit of the indicator lamp 2 HL.

When the pressure in the inner cavity of the switch machine shell is larger than or equal to a set pressure parameter value C of the mechanical pressure switch YL, the contact 01 and the contact 02 of the mechanical pressure switch YL are closed;

When the switch machine housing cavity pressure is less than the set pressure parameter value C of the mechanical pressure switch YL, the contact 01 and the contact 02 of the mechanical pressure switch YL are disconnected.

In order to more clearly understand the present utility model, the technical principle and the working mechanism of the digital display pressure switch YB are explained below.

In the utility model, the digital display pressure switch YB is used as the existing electrical element, and the pressure switch with the model DP101-HT produced by the electric appliance limited company can be adopted, and is mainly used for detecting the change of the pressure in the inner cavity of the switch machine shell, and the work of the intermediate relay K2 and the buzzer HA is controlled by opening and closing the contacts of the switch machine shell according to the different pressures in the inner cavity of the switch machine shell.

In the concrete implementation, for the digital display pressure switch YB, a contact 01 and a contact 04 of the digital display pressure switch YB are used for switching on a power supply of the digital display pressure switch, and a contact 02 and a contact 03 of the digital display pressure switch are both normally open contacts.

The working principle of the digital display pressure switch YB is as follows: presetting four parameter values D1, D2, E1 and E2, wherein D1 is more than D2 and E1 is more than E2, and the set parameter values D1 and D2 are working intervals of a contact 02 and a contact 04 of the digital display pressure switch YB; the set parameter values E1 and E2 are the working intervals of the contact 03 and the contact 04 of the digital display pressure switch YB. When D1 is smaller than the pressure in the inner cavity of the switch machine shell and is smaller than or equal to D2, the contact 02 and the contact 04 of the digital display pressure switch YB are closed; when the pressure in the inner cavity of the switch machine shell is less than or equal to D1 or more than D2, the contact 02 and the contact 04 of the digital display pressure switch YB are disconnected. When E1 is smaller than the pressure in the inner cavity of the switch machine shell and is smaller than or equal to E2, the contact 03 and the contact 04 of the digital display pressure switch YB are closed; when the pressure in the inner cavity of the switch machine shell is less than or equal to E1 or more than E2, the contact 03 and the contact 04 of the digital display pressure switch YB are disconnected.

In the utility model, the contact 01 and the contact 04 of the digital display pressure switch YB are applied, wherein the contact 01 and the contact 04 of the digital display pressure switch YB are used for switching on a power supply, and the digital display pressure switch YB starts working after being electrified.

In the utility model, a contact 02 of a digital display pressure switch YB is applied, the contact 02 of the digital display pressure switch YB is connected with a working circuit of an intermediate relay K2, and when the pressure of the inner cavity of a shell of the switch machine is less than or equal to D1 and less than D2, the contact 02 and the contact 04 of the digital display pressure switch YB are closed to switch on the working circuit of the intermediate relay K2; when the pressure in the inner cavity of the switch machine shell is less than or equal to D1 or more than D2, the contact 02 and the contact 04 of the digital display pressure switch YB are disconnected, and the working circuit of the intermediate relay K2 is disconnected.

In the utility model, a contact 03 of a digital display pressure switch YB is applied, and the contact 03 of the digital display pressure switch YB is connected with a working circuit of a buzzer HA. When E1 is smaller than the pressure in the inner cavity of the switch machine shell and is smaller than or equal to E2, the contact 03 and the contact 04 of the digital display pressure switch YB are closed, and a working circuit of the buzzer HA is connected; when the pressure in the inner cavity of the switch machine shell is less than or equal to E1 or more than E2, the contact 03 and the contact 04 of the digital display pressure switch YB are disconnected, and the working circuit of the buzzer HA is disconnected.

It should be noted that fig. 7 only shows the wiring principle inside the digital display pressure switch YB, the contacts connected with the digital display pressure switch YB are all in fig. 2, and each electrical component, such as a transistor, appearing in fig. 7 belongs to an electronic component inside the digital display pressure switch, and in the present utility model, the connection is not needed again, and the description is omitted here.

In order to more clearly understand the detection method of the present utility model, the following will describe in detail with reference to specific examples.

The utility model provides a sealing performance detection device of a frog machine, which comprises the following working modes:

1. Operation mode one:

As shown in fig. 8, after the self-locking button S1 is pressed, the contact 13 and the contact 14 of the self-locking button S1 are turned on, the power supplies of the time relay KT1 and the time relay KT2 are turned on (specifically, the contact 10 and the contact 2 of the time relay KT1 are powered on, and the contact 10 and the contact 2 of the time relay KT2 are powered on, so that the contact 8 and the contact 11 of the time relay KT1 are closed and conductive, and the contact 5 and the contact 7 of the time relay KT2 are closed and conductive), and the time relay KT1 starts to count time;

The contact 01 of the vacuum pump ZKB is connected with the positive electrode end of a direct current power supply DC (for example, a 24V direct current battery) through a self-locking button S1, the contact 02 of the vacuum pump ZKB is connected with the negative electrode end of the direct current power supply DC (for example, the 24V direct current battery) through a time relay KT1 and an intermediate relay K1, and the vacuum pump ZKB starts to work; at this time, the contact 8 and the contact 11 of the time relay KT1 are turned on, and the contact 11 and the contact 3 of the intermediate relay K1 are turned on;

2. And a second working mode:

As shown in fig. 9, when the switch machine housing inner chamber pressure reaches (i.e., is greater than or equal to) the set pressure parameter value C of the mechanical pressure switch YL, the contacts 01 and 02 of the mechanical pressure switch YL are closed, thereby completing the operating circuit of the intermediate relay K1 (i.e., the contacts 9 and 5 of the intermediate relay K1 are closed, such that the contacts 9 and 5 are energized) and the indicator lamp 2 HL.

If the pressure in the inner cavity of the casing of the switch machine reaches (i.e. is greater than or equal to) the set pressure parameter value C of the mechanical pressure switch YL, the vacuum pump vacuumizing duration (i.e. the actual time for the vacuum pump ZKB to suck the pressure in the inner cavity of the casing of the switch machine to the set pressure parameter value C of the mechanical pressure switch YL) is greater than or equal to the set time parameter value A of the time relay KT1, on one hand, the contact 8 and the contact 11 of the time relay KT1 are disconnected, and the vacuum pump ZKB stops working because the time relay KT1 is an electrified time delay type time relay;

On the other hand, the contact 5 and the contact 6 of the time relay KT1 are communicated, the contact 01 of the buzzer HA is connected with the positive end of the direct current power supply DC through the contact 14 and the contact 13 of the self-locking button S1, the contact 02 of the buzzer HA is connected with the negative end of the direct current power supply DC through the contact 5 and the contact 7 of the time relay KT2 and the contact 6 and the contact 5 of the time relay KT1, and the buzzer HA starts to give out a flash alarm, so that the sealing performance of the whole machine does not meet the vacuumizing requirement, namely the sealing performance is disqualified;

In the utility model, when the pressure in the inner cavity of a switch machine shell reaches (i.e. is greater than or equal to) a set pressure parameter value C of a mechanical pressure switch YL, a contact 01 and a contact 02 of the mechanical pressure switch YL are closed, a contact 14 of the intermediate relay K1 is connected with a positive end (specifically 24V direct current battery DC+) of a direct current power supply DC through a contact 14 and a contact 13 of a self-locking button S1, a contact 13 of the intermediate relay K1 is connected with a negative end (specifically 24V direct current battery DC-) of the direct current power supply DC through the contact 01 and the contact 02 of the mechanical pressure switch YL, an internal coil of the intermediate relay K1 is connected with the direct current power supply DC (24V direct current battery) through the contact 14 and the contact 13, so that a working circuit of the intermediate relay K1 is switched on, an armature in the intermediate relay K1 is sucked up, a movable contact 9 and a normally open contact 5 of the intermediate relay K1 are closed, a movable contact 11 and a normally open contact 7 are closed, a movable contact 12 and a normally open contact 8 are closed, a movable contact 9 and a normally closed contact 1 and a normally closed contact 2 and a normally closed contact 3 and a normally closed contact 11 and a normally closed contact 4 are opened;

When the pressure in the inner cavity of the switch machine shell reaches (i.e. is greater than or equal to) the set pressure parameter value C of the mechanical pressure switch YL, the contact 01 and the contact 02 of the mechanical pressure switch YL are closed, the contact 01 of the indicator lamp 2HL is connected with the positive end (specifically 24V direct current battery DC+) of the direct current power supply DC through the contact 14 and the contact 13 which are connected with the self-locking button S1, the contact 02 of the indicator lamp 2HL is connected with the negative end (specifically 24V direct current battery DC-) of the direct current power supply DC through the contact 01 and the contact 02 of the mechanical pressure switch YL, the indicator lamp 2HL is conducted with the direct current power supply DC (24V direct current battery) through the contact 01 and the contact 02 on the contact 01, so that a working circuit of the indicator lamp 2HL is connected, and the indicator lamp 2HL is lighted.

It should be further noted that, because after the self-locking button S1 is pressed, the working circuit of the time relay KT1 and the vacuum pump ZKB is simultaneously turned on, the time relay KT1 starts to time, the vacuum pump ZKB starts to vacuumize the inner cavity of the switch machine shell, if the pressure of the inner cavity of the switch machine shell reaches (i.e. is greater than or equal to) the set pressure parameter value C of the mechanical pressure switch YL, the vacuum pumping duration (i.e. the actual time) required by the set time parameter value a (i.e. the standard time) of the time relay KT1 is greater than or equal to the set time parameter value a (i.e. the standard time), the time relay KT1 firstly times to the a time, and when the time relay KT1 times to the a time, the time delay breaking contact 8 and the contact 11 of the time relay KT1 are opened. At this time, the negative pressure in the inner cavity of the switch machine shell is not pumped to the set pressure parameter value C of the mechanical pressure switch YL, so that the working circuit of the intermediate relay K1 is not switched on, and the normally closed contact 11 and the contact 3 of the intermediate relay K1 are still in the on state.

As shown in fig. 5a, because the time relay KT1 and the vacuum pump ZKB working circuit are simultaneously turned on after the self-locking button S1 is pressed, the time relay KT1 starts to time, the vacuum pump ZKB starts to vacuumize the inner cavity of the switch machine shell, if the vacuum pumping duration required by the inner cavity pressure of the switch machine shell to reach (i.e. be greater than or equal to) the set pressure parameter value C of the mechanical pressure switch YL, (i.e. the actual time) is greater than or equal to the set time parameter value a (i.e. the standard time) of the time relay KT1, the time relay KT1 firstly times to the a time, and when the time relay KT1 times to the a time, the delay on contacts 5 and 6 of the time relay KT1 are turned on. At this time, the time relay KT2 has not started to count, and the time delay opening contact 5 and the contact 7 of the time relay KT2 are in an on state.

3. And a third working mode:

as shown in fig. 10, if the vacuum pump evacuation time period required for the case cavity pressure of the switch machine to reach (i.e., be greater than or equal to) the set pressure parameter value C of the mechanical pressure switch YL is less than the set time parameter value a (i.e., delay time) of the time relay KT1, the contacts 01 and 02 of the mechanical pressure switch YL are turned on;

It should be noted that, because the working circuit of the time relay KT1 and the vacuum pump ZKB is simultaneously turned on after the self-locking button S1 is pressed, the time relay KT1 starts to time, the vacuum pump ZKB starts to vacuumize the inner cavity of the switch machine shell, if the inner cavity pressure of the switch machine shell reaches (i.e. is greater than or equal to) the set pressure parameter value C of the mechanical pressure switch YL, the vacuum pumping duration (i.e. the actual time) required by the vacuum pump is less than the set time parameter value a (i.e. the standard time) of the time relay KT1, and when the time relay KT1 does not time to time a, the vacuum pump ZKB pumps the inner cavity pressure of the switch machine shell to the set pressure parameter value C of the mechanical pressure switch YL, and the membrane inside the mechanical pressure switch YL deforms to turn on the contact 01 and the contact 02 of the mechanical pressure switch YL.

At this time, as shown in fig. 10, the contact 14 of the intermediate relay K1 is connected to the positive terminal of the DC power supply DC (for example, 24V DC battery) through the contact 14 and the contact 13 of the self-locking button S1, the contact 13 of the intermediate relay K1 is connected to the negative terminal of the DC power supply DC (for example, 24V DC battery) through the contact 01 and the contact 02 of the mechanical pressure switch YL, so that the intermediate relay K1 starts to be energized, on the one hand, the contact 6 and the contact 10 of the intermediate relay K1 are turned on, the contact 12 and the contact 8 of the intermediate relay K1 are turned on, thereby turning on the contact 04 and the contact 01 of the time relay KT1, and the time relay KT1 stops timing; on the other hand, the contact 5 and the contact 9 of the intermediate relay K1 are connected, and at this time, the contact 13 of the intermediate relay K1 is connected with the negative terminal of a direct current power supply DC (for example, a 24V direct current battery) through the contact 9 and the contact 5 of the intermediate relay K1 to form a self-locking loop;

At this time, in view of the fact that the contact 01 of the indicator lamp 2HL is connected with the positive terminal of the direct current power supply DC (for example, 24V direct current battery) through the contact 14 and the contact 13 of the self-locking button S1, the contact 02 of the indicator lamp 2HL is connected with the negative terminal of the direct current power supply DC (for example, 24V direct current battery) through the contact 9 and the contact 5 of the intermediate relay K1, so that the indicator lamp 2HL is lighted at this time, and the sealing performance of the whole machine of the switch machine meets the vacuumizing requirement, namely, the sealing performance is qualified.

After the intermediate relay K1 starts the energization operation, the contact 6 and the contact 10 of the intermediate relay K1 are turned on and the contact 12 and the contact 8 of the intermediate relay K1 are turned on, because: after the intermediate relay K1 starts to be electrified, the coil of the intermediate relay K1 is electrified, the movable iron core acts and is attracted under the action of electromagnetic force to drive the movable contact to act, and the movable contact is separated from the normally-closed contact and is closed with the normally-open contact; the coil is powered off, the movable iron core drives the movable contact to reset under the action of the spring, and the movable contact is closed with the normally closed contact and disconnected with the normally open contact; therefore, after the intermediate relay K1 starts the energization operation, the movable contact 10 and the normally open contact 6 of the intermediate relay K1 are closed and turned on, and the movable contact 12 and the normally open contact 8 are closed and turned on.

With the present utility model, after the contact 04 and the contact 01 of the time relay KT1 are turned on, the time relay KT1 stops counting because: the contact 04 and the contact 01 of the time relay KT1 are used for connecting a pause timing contact of the time relay KT1, and after the contact 04 and the contact 01 of the time relay KT1 are connected, the time relay KT1 is triggered to form a pause timing signal, so that the time relay KT1 stops timing.

In the utility model, the working principle of the intermediate relay is as follows: the coil is electrified, the movable iron core acts and attracts under the action of electromagnetic force to drive the movable contact to act, the movable contact is separated from the normally-closed contact, and the normally-open contact is closed; the coil is powered off, the movable iron core drives the movable contact to reset under the action of the spring, and the movable contact is closed with the normally closed contact and disconnected with the normally open contact;

For the intermediate relay K1, the contact 14 and the contact 13 of the intermediate relay K1 are connected with the coil of the intermediate relay K1, after the contact 14 and the contact 13 of the intermediate relay K1 are powered on, the coil is electrified, the intermediate relay K1 starts to work, and the movable iron core is attracted under the action of electromagnetic force, so that the movable contact 9 and the normally open contact 5 of the intermediate relay K1 are closed, the movable contact 10 and the normally open contact 6 are closed, the movable contact 11 and the normally open contact 7 are closed, the movable contact 12 and the normally open contact 8 are closed, the movable contact 9 and the normally closed contact 1 are opened, the movable contact and the normally closed contact 2 are opened, the movable contact 11 and the normally closed contact 3 are opened, and the movable contact 12 and the normally closed contact 4 are opened.

In the present utility model, when the pressure in the inner cavity of the switch machine case reaches (i.e., is equal to or greater than) the set pressure parameter value C of the mechanical pressure switch YL, the normally open contact 01 and the contact 02 of the mechanical pressure switch YL are closed. The intermediate relay K1 is connected with a power supply through the contact 01 and the contact 02 of the mechanical pressure switch YL, a working circuit of the intermediate relay K1 is connected (namely, the contact 9 and the contact 5 of the intermediate relay K1 are connected, so that the contact 9 and the contact 5 are electrified), the moving contact 9 and the normally open contact 5 of the intermediate relay K1 are closed, and at the moment, the intermediate relay K1 and the normally open contact 5 form a self-locking loop through the moving contact 9 of the intermediate relay K1.

After the working circuit of the intermediate relay K1 is switched on, the moving contact 11 of the intermediate relay K1 is disconnected from the normally closed contact 3, so that the working circuit of the vacuum pump ZKB is disconnected, and the vacuum pump ZKB stops working.

The self-locking loop has the functions that: for preventing the vacuum pump from being operated again when the internal cavity pressure of the casing of the switch machine is lower than the set pressure parameter value C of the mechanical pressure switch YL. This is because: the working circuit of the vacuum pump ZKB is connected in series with the normally closed contact 11 and the moving contact 3 of the intermediate relay K1, and the working circuit of the intermediate relay K1 is connected in series with the normally open contact 01 and the contact 02 of the mechanical pressure switch YL, and the closing and the on-off of the normally open contact 01 and the contact 02 of the mechanical pressure switch YL are influenced by the pressure of the inner cavity of the switch machine shell.

If the self-locking loop does not exist, the pressure in the inner cavity of the switch machine shell does not reach the set pressure parameter value C of the mechanical pressure switch YL, the normally open contact 01 and the contact 02 of the mechanical pressure switch YL are disconnected, the working circuit of the intermediate relay K1 is not connected, the normally closed contact 11 and the moving contact 3 of the intermediate relay K1 are in a closed state, the working circuit of the vacuum pump ZKB is always connected, and the vacuum pump ZKB is always working. Until the pressure in the inner cavity of the switch machine shell reaches the set pressure parameter value C of the mechanical pressure switch YL, the normally open contact 01 and the contact 02 of the mechanical pressure switch YL are connected, the working circuit of the intermediate relay K1 is connected, the normally closed contact 11 and the moving contact 3 of the intermediate relay K1 are disconnected, the working circuit of the vacuum pump ZKB is disconnected, and the vacuum pump ZKB stops working.

When the switch machine housing internal pressure changes to a set pressure parameter value C below the mechanical pressure switch YL, the vacuum pump is again activated and the cycle is repeated, in view of the change in switch machine housing internal pressure.

After the self-locking loop is designed, when the pressure in the inner cavity of the switch machine shell reaches the set pressure parameter value C of the mechanical pressure switch YL for the first time, the normally open contact 01 and the contact 02 of the mechanical pressure switch YL are connected, the working circuit of the intermediate relay K1 is connected, the moving contact 9 and the normally open contact 5 of the intermediate relay K1 are closed, the intermediate relay K1 forms the self-locking loop through the moving contact 9 and the normally open contact 5, the working circuit of the intermediate relay K1 can be always in a connection state through the self-locking loop and is not influenced by the normally open contact 01 and the normally open contact 02 of the mechanical pressure switch YL any more,

4. And a fourth working mode:

as shown in fig. 11, when the negative pressure of the inner cavity of the casing of the switch machine is higher than the set pressure parameter value D1 of the digital display pressure switch YB, the contact 02 of the digital display pressure switch YB is connected with the contact 04 of the digital display pressure switch YB through the main circuit of the digital display pressure switch YB;

It should be noted that, the digital display pressure switch is based on high performance electronic components, and uses an inlet high precision pressure sensitive element as a measuring element, and an advanced digital circuit is adopted to convert the power signal induced by the pressure sensitive element into a switch signal.

When the negative pressure of the inner cavity of the switch machine shell is higher than the set pressure parameter value D1 of the digital display pressure switch YB, an inner induction inner disc of the switch machine shell instantaneously moves, so that the contact 02 of the digital display pressure switch YB is communicated with the contact 04 of the digital display pressure switch YB through a main circuit of the digital display pressure switch YB, namely, the contact 02 and the contact 04 of the digital display pressure switch YB are closed.

At this time, the contact 13 of the intermediate relay K2 is connected with the negative terminal of the direct current power supply DC (for example, 24V direct current battery) through the contact 02 of the digital display pressure switch YB, the contact 14 of the intermediate relay K2 is connected with the positive terminal of the direct current power supply DC (for example, 24V direct current battery) through the contact 14 and the contact 13 of the self-locking button S1, so that the intermediate relay K2 starts to work, thereby disconnecting the contact 12 and the contact 4 of the intermediate relay K2, and further disconnecting the contact 4 and the contact 1 of the time relay KT2, so that the time relay KT2 starts to time;

The working principle of the intermediate relay is that the coil is electrified, the movable iron core acts and is attracted under the action of electromagnetic force to drive the movable contact to act, and the movable contact is separated from the normally closed contact and is closed with the normally open contact; the coil is powered off, the movable iron core drives the movable contact to reset under the action of the spring, and the movable contact is closed with the normally-closed contact and disconnected with the normally-open contact.

For the intermediate relay K2, the contact 14 and the contact 13 of the intermediate relay K2 are connected with the coil of the intermediate relay K2, after the contact 14 and the contact 13 of the intermediate relay K2 are powered on, the coil is electrified, the intermediate relay K2 starts to work, and the movable iron core is attracted under the action of electromagnetic force, so that the normally closed contact 4 and the movable contact 12 of the intermediate relay K2 are disconnected.

For time relay KT2, time relay KT 2's contact 4 and contact 1 connect time relay KT 2's suspension timing contact, and its theory of operation is: when the contact 4 is connected with the contact 1, triggering a pause timing signal of the time relay KT1, and stopping timing of the time relay; when the contact 4 is disconnected from the contact 1, the pause timing signal of the time relay KT1 is disconnected, and the time relay starts timing. Thus, after contact 4 and contact 1 of time relay K2 are opened, time relay KT2 begins to count.

After the time relay KT2 starts to time, as shown in fig. 10, and when the set time parameter value B (i.e. delay time) of the time relay KT2 is not reached, when the negative pressure in the inner cavity of the casing of the switch machine changes from the set pressure parameter value D1 of the digital pressure switch YB to be higher than the set pressure parameter value D2 of the digital pressure switch YB or equal to the set pressure parameter value E1 of the digital pressure switch YB, on the one hand, the contact 02 of the digital pressure switch YB is disconnected with the contact 04 of the digital pressure switch YB through the main circuit of the digital pressure switch YB, so that the intermediate relay K2 stops working (because the contact 14 and the contact 13 lose electricity), thereby connecting the contact 12 and the contact 4 of the intermediate relay K2, and then connecting the contact 4 and the contact 1 of the time relay KT2, and the time relay KT2 stops timing;

It should be noted that, the digital display pressure switch YB is an intelligent digital display pressure switch, when the negative pressure in the shell cavity of the switch machine changes from the set pressure parameter value D1 of the digital display pressure switch YB to a value higher than the set pressure parameter value D2 of the digital display pressure switch YB or equal to the set pressure parameter value E1 of the digital display pressure switch YB, the inductive inner disc inside the digital display pressure switch YB is reset instantaneously, so that the contact 02 of the digital display pressure switch YB is disconnected from the contact 04 of the digital display pressure switch YB through the main circuit of the digital display pressure switch YB.

For the intermediate relay K2, the contact 14 and the contact 13 of the intermediate relay K2 are connected with the coil of the intermediate relay K2, when the intermediate relay K2 stops working, the coil is powered off, the intermediate relay K2 starts working, and the movable iron core drives the movable contact to reset under the action of the spring, so that the normally closed contact 4 and the movable contact 12 of the intermediate relay K2 are closed.

For the time relay KT2, because the contact 04 and the contact 01 of the time relay KT2 are connected with the pause timing contact of the time relay KT2, after the contact 04 and the contact 01 of the time relay KT2 are switched on, the pause timing signal of the time relay KT2 is triggered, so that the time relay KT2 stops timing.

On the other hand, the contact 03 of the digital display pressure switch YB is communicated with the contact 04 of the digital display pressure switch YB through a main circuit of the digital display pressure switch YB;

It should be noted that, the digital display pressure switch YB is an intelligent digital display pressure switch, when the negative pressure in the shell cavity of the switch machine changes from the set pressure parameter value D1 of the digital display pressure switch YB to a value higher than the set pressure parameter value D2 of the digital display pressure switch YB or equal to the set pressure parameter value E1 of the digital display pressure switch YB, another inductive inner disc inside the digital display pressure switch YB moves, so that the contact 03 of the digital display pressure switch YB is connected with the contact 04 of the digital display pressure switch YB through the main circuit of the digital display pressure switch YB.

As shown in fig. 10, a contact 01 of a buzzer HA is connected with a positive terminal of a DC power supply DC (for example, 24V DC battery) through a contact 14 and a contact 13 of a self-locking button S1, a contact 02 of the buzzer HA is connected with a negative terminal of the DC power supply DC (for example, 24V DC battery) through a contact 5 and a contact 7 of a time relay KT2, a contact 6 and a contact 10 of an intermediate relay K1 and a contact 03 of a digital display pressure switch YB, and at this time, the buzzer HA starts a flashing alarm, which means that the sealing performance of the whole machine of the switch machine does not meet the pressure maintaining requirement, namely, the pressure maintaining performance is not qualified.

5. Working mode five:

As shown in fig. 12, after the time relay KT2 starts timing, if the negative pressure in the casing cavity of the switch machine is changed from the set pressure parameter value D1 of the digital pressure switch YB to be still smaller than the set pressure parameter value D2 of the digital pressure switch YB, the contact 02 of the digital pressure switch YB is conducted with the contact 04 of the digital pressure switch YB through the main circuit of the digital pressure switch YB, the intermediate relay K2 continuously works (because the contact 14 and the contact 13 are powered), the contact 12 and the contact 4 of the intermediate relay K2 are disconnected at this time, the contact 4 and the contact 1 of the time relay KT2 are further disconnected, the time relay KT2 continuously counts time until the set time parameter value B (i.e. delay time) of the time relay KT2 is still smaller, so that the contact 5 and the contact 7 of the time relay KT2 are disconnected, the contact 9 and the contact 8 of the time relay KT2 are connected, therefore, the contact 01 of the indicator lamp 3HL is continuously operated (because the contact 14 and the contact 13 of the self-locking button S1 are electrically connected with the direct current power supply, i.e.e. the direct current (e.g. the direct current power supply) and the direct current (DC power) end of the direct current (voltage) 3) are satisfied, and the direct current power supply voltage (the direct current end) is indicated by the direct current end) is satisfied, and the direct current end of the contact 24 is indicated by the direct current end of the contact 3, for example, the contact 01 of the indicator lamp is connected.

It should be noted that, for the time relay KT2, the contact 5 and the contact 7 of the time relay KT2 are delay-open contacts, the contact 8 and the contact 9 are delay-close contacts, and the two sets of contacts work independently but are controlled by the timing time of the time relay KT 2. The working principle of the device is as follows: when the time relay KT2 is in the initial state (when starting timing), the contacts 5 and 7 are in the closed state, and the contacts 8 and 9 are in the open state; when the timing of the time relay KT2 is finished, the contact 5 and the contact 7 of the time relay KT2 are opened, and the contact 9 and the contact 8 are closed and connected.

In order to more clearly understand the technical scheme of the present utility model, the working principle of the present utility model is described below.

For the device, the device is connected into an inner cavity interface of a dustproof sealing switch machine shell through a quick connector, and the quick connector is connected with a digital display pressure switch and a vacuum pump through an air pipe; pressing a start button (namely a self-locking button), and lighting the power indicator lamp 1HL to indicate that the vacuum pump starts to work;

When the negative pressure in the inner cavity of the casing of the switch machine reaches (i.e. is greater than or equal to) the set value of the mechanical pressure switch, the vacuum pump stops working.

When the vacuumizing time is smaller than the set time (namely, the set time parameter value A of the instant relay KT 1), the indicator lamp 2HL is lightened, and the sealing performance of the whole machine meets the vacuumizing requirement;

when the vacuumizing time is longer than the set time (namely, the set time parameter value A of the relay KT 1), the buzzer flashes and gives an alarm, and the situation that the whole sealing performance of the switch machine does not meet the vacuumizing requirement is represented.

After the vacuum pump stops working, when the internal cavity negative pressure of the whole machine of the switch machine is higher than the set pressure lower limit of the digital display pressure switch, the time relay KT2 starts to count, and when the internal cavity negative pressure of the whole machine is higher than the set pressure upper limit (D2) of the digital display pressure switch or equal to the set pressure upper limit (E1) of the digital display pressure switch, the time relay stops KT2 to count.

When the negative pressure of the whole inner cavity of the switch machine is lower than the set pressure upper limit (namely D2) of the digital display pressure switch in the set time (namely the set time parameter value A of the instant relay KT 1), the indicator light 3HL is on, and the sealing performance of the whole machine meets the pressure maintaining requirement;

When the negative pressure in the whole casing of the switch machine is higher than the upper limit (namely D2) of the set pressure of the digital display pressure switch in the set time (namely the set time parameter value A of the time relay KT 1), the buzzer flashes and alarms, and the sealing performance of the whole switch machine does not meet the pressure maintaining requirement.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims

1. The sealing performance detection device of the switch machine is characterized by comprising a vacuum pump ZKB, a mechanical pressure switch YL, a digital display pressure switch YB and an electrical control module;

2. The sealing performance detecting device of a switch machine according to claim 1, wherein two ends of the connecting pipe are respectively provided with a quick connector;

3. The sealing performance detecting device of a switch machine according to claim 1, wherein the positive terminal of the direct current power supply DC is connected with the contact 13 of the self-locking button S1;

the contact 14 of the self-locking button S1 is connected with the node M;

the contact 3 of the intermediate relay K1 is connected with the node N;

the contact 8 of the time relay KT2 is connected with the node N;

The contact 5 of the time relay KT1 is connected with the node N;

4. The switch machine sealing performance detecting device as claimed in claim 3, wherein the electric control module further comprises an indicator lamp 1HL;

the contact 02 of the indicator lamp 1HL is connected to the node M.

5. The switch machine sealing performance detecting device as claimed in claim 3, wherein the contact 13 of the intermediate relay K1 is connected with the contact 9 of the intermediate relay K1 through a wire, and the contact 5 of the intermediate relay K1 is connected with the negative terminal of the direct current power source DC.

6. The switch machine sealing performance detecting device as claimed in claim 3, wherein the contact 12 of the intermediate relay K1 is connected with the contact 4 of the time relay KT1 through a wire;

7. The switch machine sealing performance detecting device as claimed in claim 3, wherein the contact 12 of the intermediate relay K2 is connected with the contact 4 of the time relay KT2 through a wire;

8. The sealing performance detecting apparatus of a switch machine according to any one of claims 1 to 7, wherein a set pressure parameter value C is preset on the mechanical pressure switch YL;

9. The sealing performance detecting apparatus of a switch machine according to any one of claims 1 to 7, wherein the time relay KT1 and the time relay KT2 are both power-on delay type time relays;

A set time parameter value B as a delay time is preset on the time relay KT 2.