CN213812121U

CN213812121U - Displacement type sensor detection device

Info

Publication number: CN213812121U
Application number: CN202022345569.5U
Authority: CN
Inventors: 陈怡因
Original assignee: Ema Electronic Suzhou Co ltd
Current assignee: Ema Electronic Suzhou Co ltd
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-07-27
Anticipated expiration: 2030-10-20

Abstract

The utility model provides a displacement formula sensor detection device, it includes the following module through wire interconnect: the distance testing module is used for detecting the distance of the sensor; the multi-path gating module comprises a positive and negative connection communication module, a three-line communication module and a two-line communication module, and is provided with a button for selecting the positive and negative connection communication module, the three-line communication module and the two-line communication module; the overload and short-circuit protection testing module is used for testing overload and short-circuit protection; and the output display module comprises a current meter and a sliding rheostat, so that the current magnitude under different loads can be simulated by adjusting the resistance value of the sliding rheostat. The utility model discloses a displacement formula sensor detection device adopts switching on of multichannel gating module control inner line, and need not to use single chip microcomputer program control, and it is controllable consequently to have a test procedure, and the result is directly perceived, convenient operation, advantages such as low cost can satisfy the quick test demand of different sensors.

Description

Displacement type sensor detection device

Technical Field

The utility model relates to a sensor detection device field especially relates to a displacement type sensor detection device.

Background

In the technical field of level instruments, a capacitive displacement sensor is mainly applied to level and liquid level control or upper and lower limit alarm. The capacitance displacement sensor utilizes the measuring principle of capacitance, takes a probe and a measured object as two polar plates of the capacitance, charges and discharges the formed capacitance through a high-frequency oscillation circuit, and generates a switching signal through the processing of an internal circuit according to the distance change and the difference of dielectric constants of the measured object, thereby achieving the purpose of material level detection.

In the technical field of level instruments, an inductive displacement sensor is mainly applied to level and liquid level control or upper and lower limit alarm. The inductance type displacement sensor utilizes an LC oscillating circuit formed by an electromagnetic head and a capacitor to generate a low-energy electromagnetic field, and when a conductive object target enters a magnetic field, a cyclotron current begins to spread in a conductor so as to reduce the current of an oscillator. When the oscillator current is reduced to an accurate point, the oscillation is stopped, the electromagnetic field disappears, and at the moment, an internal circuit generates a switching signal so as to achieve the aim of level detection.

The traditional capacitance and inductance sensor testing method mostly adopts MCU automatic control, different types of sensors need to be provided with different parameters, the process is more complicated, and the testing time is longer. Meanwhile, because the testing methods of the capacitive sensor and the inductive sensor are different, one machine cannot meet the testing requirements of two sensors at the same time.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model discloses a displacement type sensor detection device, include the following module through wire interconnect: the distance testing module is used for detecting the distance of the sensor; the multi-path gating module comprises a positive and negative connection communication module, a three-line communication module and a two-line communication module, and is provided with a button for selecting the positive and negative connection communication module, the three-line communication module and the two-line communication module; the overload and short-circuit protection testing module is used for testing overload and short-circuit protection; and the output display module comprises a current meter and a sliding rheostat, so that the current magnitude under different loads can be simulated by adjusting the resistance value of the sliding rheostat.

The utility model discloses an among the displacement type sensor detection device, multichannel gating module includes that 2 lines/3 lines switch, positive and negative connect the selection function of switching, overload/short circuit test to can set up the test index of the sensor of required test fast through multichannel gating module, can take different setting methods to different sensor models simultaneously.

Further, the distance test module comprises a grating displacement control device, a clamping device and a distance display module, wherein the clamping device is used for fastening a sensor, the grating displacement control device is connected with the distance display module and comprises a grating ruler, a baffle and a hand-operated rotating wheel, the front and back displacement of the grating ruler is controlled through the front and back rotation of the hand-operated rotating wheel, and the displacement change is displayed through the distance display module.

Further, the distance display module adopts a distance display module with one thousandth precision and is provided with a zero clearing button.

Furthermore, the clamping device is composed of two half sides with the same shape, each half side is of an inverted arch bridge structure, a hollow part is reserved after the two half sides are mutually attached to each other to be used for fastening the sensor, one half side is fixed on the sensor detection device, the other half side is supported by the flat plate, and the two half sides of the clamping device are attached to each other through the spring.

Further, the clamping device is suitable for fastening various sensors with sizes ranging from M8 to M34.

Furthermore, the displacement sensor detection device further comprises a voltage drop display module and a leakage current display module, so as to respectively test whether voltage drop and leakage current indexes of the two-wire product are normal.

Further, the three-wire communication module comprises an NPN communication module and a PNP communication module.

Further, the voltage drop display module is a digital voltmeter with one percent precision, and the leakage current display module is a digital ammeter with one percent precision.

Further, the output display module comprises a one-hundredth precision digital ammeter and a sliding rheostat with the resistance value of 200 ohms.

Further, the overload and short-circuit protection test module controls the connection of the sensor output loop under the control of the multi-path gating module, wherein the sensor output loop is connected with a resistor which is not more than 150 ohms after the sliding rheostat is short-circuited in the overload protection test, and the sensor output loop is directly connected with a power supply after the sliding rheostat is short-circuited in the short-circuit protection test.

The utility model discloses a displacement formula sensor detection device adopts switching on of multichannel gating module control inner line, and need not to use single chip microcomputer program control, and it is controllable consequently to have a test procedure, and the result is directly perceived, convenient operation, advantages such as low cost can satisfy the quick test demand of different sensors.

Drawings

Fig. 1 is a block diagram schematically illustrating the structure of the displacement sensor detection device according to the present invention;

fig. 2 is a schematic structural diagram of the displacement sensor detection device of the present invention.

Detailed Description

The technical solution of the present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.

Referring to fig. 1 and 2, the displacement sensor detecting device of the present invention includes: a distance test module 10 for detecting a sensor distance; the multiplex gating module 20 comprises a positive and negative connection communication module 201, a three-wire connection module 202 and a two-wire connection module 203, and is provided with a button for selecting the positive and negative connection communication module 201, the three-wire connection module 202 and the two-wire connection module 203; an overload and short-circuit protection test module 30 for detecting whether the protection is normal; the output display module 40 comprises an ammeter 402 and a sliding rheostat 401, so that the current magnitude under different loads can be simulated by adjusting the resistance value of the sliding rheostat 401. The modules are connected with each other by leads, and the sensor is suitable for detection of capacitance and inductance displacement sensors with two-wire systems, three-wire systems and four-wire systems.

Preferably, the three-wire communication module 202 includes an NPN communication module 2021 and a PNP communication module 2022.

Preferably, the distance testing module 10 includes a grating displacement control device, a clamping device 11 and a distance display module, the clamping device is used for fastening the sensor 50 to be tested, the grating displacement control device is connected with the distance display module and includes a grating ruler, a baffle 12 and a hand-operated rotating wheel 13, wherein the front and back displacement of the grating ruler is controlled by the front and back rotation of the hand-operated rotating wheel, and the change amount of the displacement is displayed by the distance display module.

Preferably, the distance display module uses a distance display module with one thousandth precision, is connected with the grating displacement control device, accurately reflects the current detection distance of the sensor, and comprises a zero clearing button, so that the current distance data can be cleared at any time for carrying out the next test.

Preferably, the clamping device consists of two halves with the same shape, each half is of an inverted arch bridge structure, and hollow parts are reserved after the two halves are mutually attached to each other to fasten the sensor. Wherein, one side is fixed on the detection device, the other side is supported by a flat plate, the clamping device is jointed by a spring, and the device can meet the fastening requirements of various sensors with the specification size of M8-M34.

Preferably, the displacement sensor detection device further comprises a voltage drop display module and a leakage current display module, so as to respectively test whether voltage drop and leakage current indexes of the two-wire product are normal.

Preferably, the voltage drop display module and the leakage current display module are one digital voltmeter and one digital ammeter respectively with one-hundredth precision, and whether the voltage drop and leakage current indexes of the sensor meet the requirements or not is displayed. Different from a three-wire/four-wire output sensor, the indexes of voltage drop and leakage current are particularly important in the indexes of the two-wire sensor, and the indexes directly influence whether a load can be driven or not.

Preferably, the output display module 40 includes a one-hundredth precision digital ammeter 402 and a sliding rheostat 401 having a resistance of 200 ohms.

Preferably, the overload and short-circuit protection test module controls the connection of the sensor output circuit under the control of the multi-way gating module, wherein the sensor output circuit is connected with a resistor which is not more than 150 ohms after short-circuiting the sliding rheostat in the overload protection test, and is directly connected with a power supply after short-circuiting the sliding rheostat in the short-circuit protection test.

The utility model discloses a displacement type sensor detection device's multichannel gating module contains NPN PNP and switches, 2 line 3 line switch, the switching of positive and negative connecing, transships/short circuit test's optional function to can set up the test index of the sensor of required test fast through multichannel gating module, can take different setting methods to different sensor models simultaneously.

The utility model provides a pair of electric capacity/inductance displacement formula sensor detection device has following beneficial effect: the multi-channel gating module is adopted to control the conduction of the internal circuit, and the single-chip programming control is not used, so that the method has the advantages of controllable test process, visual result, convenience in operation, low cost and the like, and can meet the rapid test requirements of different sensors.

The device work flow is as follows: the sensor specifications tested, such as three-wire NPN inductance, were confirmed prior to testing. Before the sensor is powered on, the multichannel gating module on the device is switched to the positive connection, the three wires and the NPN, and then the positive electrode, the negative electrode and the output of the sensor are connected to the detection device according to the corresponding interfaces. After the clamping device is used for fixing, the rotating hand-operated rotating wheel is rotated to enable the baffle to be in contact with the top of the sensor, the reset distance display button is pressed to start testing, the baffle is controlled to be far away from the top of the sensor by rotating the hand-operated rotating wheel, and distance display and output conditions are observed. When the output of the sensor is switched, the rotating wheel is stopped, the current distance is recorded, when the distance is different from the expected distance, the sensor is taken down, the parameters of the sensor are readjusted, the sensor is placed in the clamping device again, and the previous operation is repeated until the distance is close to the expected distance. At this time, the load resistance is adjusted to enable the sensor to be at the maximum rated output current, the overload key, the protection key and the reverse connection key are pressed in sequence, and whether the output current suddenly rises and then suddenly falls below the specification requirement is observed. If the sensor has the phenomena of no output, no reverse connection protection, too short distance or no protection and the like in the detection, the sensor is unqualified and needs to be reworked or scrapped. When the above operation is completely performed, the test sensor can be determined to be a normal piece, and the process flows to the next stage. In conclusion, the testing device has the advantages of obvious effect, simple operation and high detection speed, and is favorable for rapid implementation of factory shipment inspection links.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and improvements can be made without departing from the inventive concept, and all of them belong to the protection scope of the present invention.

Claims

1. A displacement sensor detection device, comprising the following modules interconnected by wires:

the distance testing module is used for detecting the distance of the sensor;

the multi-path gating module comprises a positive and negative connection communication module, a three-line communication module and a two-line communication module, and is provided with a button for selecting the positive and negative connection communication module, the three-line communication module and the two-line communication module;

the overload and short-circuit protection testing module is used for testing overload and short-circuit protection;

and the output display module comprises a current meter and a sliding rheostat, so that the current magnitude under different loads can be simulated by adjusting the resistance value of the sliding rheostat.

2. The displacement sensor detection device according to claim 1, wherein the distance measurement module comprises a grating displacement control device, a clamping device and a distance display module, the clamping device is used for fastening the sensor, the grating displacement control device is connected with the distance display module and comprises three parts of a grating ruler, a baffle plate and a hand-operated rotating wheel, wherein the front and back displacement of the grating ruler is controlled by the front and back rotation of the hand-operated rotating wheel, and the change amount of the displacement is displayed by the distance display module.

3. The displacement sensor detection device according to claim 2, wherein the distance display module adopts a distance display module with a precision of one thousandth and is provided with a zero clearing button.

4. The displacement sensor measuring device of claim 3, wherein the clamping device is composed of two halves having the same shape, each half having an inverted arch bridge structure, and the two halves are attached to each other to leave a hollow portion for fastening the sensor, wherein one half is fixed to the sensor measuring device, the other half is supported by the plate, and the two halves of the clamping device are attached by a spring.

5. The displacement sensor probe device of claim 4, wherein the clamp device is adapted to secure sensors of the size M8-M34.

6. The displacement sensor detection device according to any one of claims 1 to 5, further comprising a voltage drop display module and a leakage current display module for respectively testing whether the voltage drop and leakage current indexes of the two-wire product are normal.

7. The displacement sensor sensing device of any one of claims 1-5, wherein the three-wire communication module comprises an NPN communication module and a PNP communication module.

8. The displacement sensor sensing device of claim 6, wherein said voltage drop indicator is a digital voltmeter of one percent accuracy and said leakage current indicator is a digital ammeter of one percent accuracy.

9. The displacement sensor testing apparatus of any one of claims 1 to 5, wherein said output display module comprises a one hundredth accuracy digital current meter and a 200 ohm sliding rheostat.

10. The displacement sensor measuring device of any one of claims 1 to 5, wherein the overload and short-circuit protection test module controls the connection of the sensor output circuit under the control of the multiple-way gating module, wherein the sensor output circuit is connected to a resistor of not more than 150 ohms after short-circuiting the sliding rheostat when testing the overload protection, and is directly connected to the power supply after short-circuiting the sliding rheostat when testing the short-circuit protection.