CN203439944U

CN203439944U - Alarm device for limited detection

Info

Publication number: CN203439944U
Application number: CN201320561404.9U
Authority: CN
Inventors: 何伟; 赵永江; 于建淼; 于新军; 宫珊珊
Original assignee: SHANQI HEAVY MACHINERY CO Ltd
Current assignee: SHANQI HEAVY MACHINERY CO Ltd
Priority date: 2013-09-10
Filing date: 2013-09-10
Publication date: 2014-02-19
Anticipated expiration: 2023-09-10

Abstract

The utility model discloses an alarm device for limited detection. The alarm device comprises a limited control circuit, wherein the limited control circuit is connected in series with a limited switch and a relay; the limited switch is a normally closed contact point limited switch; the relay comprises a normally open contact point and a normally closed contact point; the normally closed contact point of the relay is connected in series with a switch out alarm device and a power supply to form a limited detection circuit; the normally open contact point of the relay is connected in series with a limited detection button, the detection alarm device, and the power supply to form a limited detection circuit; the normally open contact point of the relay connected in series in the limited detection circuit controls the working circuit of a crane to realize detection of the limited switch and the relay through the structure; during use, an alarm signal can be sent if the relay or the limited switch goes wrong. The alarm device for limited detection, provided by the utility model, has a simple structure, is convenient to use, and is strong in practicability.

Description

Spacing detection alarm device

Technical field

The utility model relates to hoisting crane technical field, relates in particular to the spacing detection alarm device that in, the inhibiting device of hoisting crane is carried out detection alarm.

Background technology

Conventional hoisting crane inhibiting device has mechanical cam spacing, rotary limit switch, cross deflector rod switch is spacing, the spacing limit method that waits of weight, the principle of the inhibiting device of these types is normally the same, conventionally be all to adopt travel switch and relay to control circuit, travel switch and relay make the pull up circuit of hoisting crane keep "on" position under normal circumstances, weight is hoisted and fallen, when the weight of hoisting crane arrives certain location triggered travel switch, the power-off of Control pull up circuit, make the timely stop motion of weight, yet, the components and parts such as these type inhibiting device limit switches cannot be found after damaging in time, hoisting crane is easily rushed to summit and is broken assembly pulley, break steel rope, the serious equipment fatal accidenies such as gib head tenesmus.

Summary of the invention

Technical problem to be solved in the utility model is: the spacing detection alarm device that a kind of detectability bit switch and relay are provided.

For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of spacing detection alarm device, comprise spacing control circuit, on described spacing control circuit, be connected in series with limit switch and relay, described limit switch is normally closed contact limit switch, described relay comprises open contact and normally closed contact, the normally closed contact of described relay is connected in series formation limiting detection circuit with disconnection warning device and power supply, the open contact of described relay and spacing test button, detection alarm device and power supply are connected in series formation limiting detection circuit, the open contact of the described relay of connecting in described limiting detection circuit is controlled the pull up circuit of hoisting crane.

Owing to having adopted technique scheme, described limit switch is normally closed contact limit switch, so when normal condition, relay keeps "on" position, the open contact of relay is closed, before crane loading weight, can shift to an earlier date the quality of detectability bit switch and relay, by pressing spacing test button, if the open contact of relay is closed in limiting detection circuit, limiting detection circuit will be switched on, detection alarm device sends signal alarm, limit switch and relay work are now described, pull up circuit should be switched on, even if pull up circuit no energising also illustrates it is not the problem of relay, when hoisting crane is normally used, the normally closed contact of the relay in limiting detection circuit is closed, the contact of the relay on spacing disconnection warning circuit disconnects, if relay goes wrong or limit switch goes wrong, cause the open contact of the relay in limiting detection circuit to disconnect, the normally closed contact of the relay on spacing disconnection warning circuit will be closed, therefore spacing disconnection warning circuit will be switched on, disconnect warning device and will send warning, notify in time staff to process.The circuit structure of this device is simple, therefore installs more for convenience, and the components and parts of use are less, so cost is lower, is adapted at generally application in Crane Industry.

As further improvement, on described limit switch, be parallel with 1 spacing reset button, because can triggering limit switch when reaching spacing position, the weight of hoisting crane disconnects, thereby make relay power-off, open contact is in off-state, make pull up circuit power-off, if now want, pull up circuit being switched on again can use, in the time of now just can pressing this spacing reset button, relay continues energising, thereby pull up circuit energising is worked on, for the limit switch of inhibiting device use non-automatic-reset or when limit switch damages, can this spacing reset button of Interim use be worked by hoisting crane at short notice, the weight poising is put into safe position, then limit switch is repaired.

As a kind of preferred version, described detection alarm device and disconnection warning device are buzzer phone, use buzzer phone can realize the same alarm of acousto-optic, can certainly adopt other suitable warning devices, as indicator lamp and electric bell etc.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is further illustrated.

Fig. 1 is the circuit diagram of the utility model embodiment;

In figure: 1, spacing control circuit; 2, spacing disconnection warning circuit; 3, limiting detection circuit; XS: limit switch; QA: spacing reset button; QB: spacing test button; KA: relay; 1XD: buzzer phone 2XD: buzzer phone.

The specific embodiment

As shown in Figure 1, a kind of spacing detection alarm device, comprise spacing control circuit 1, on described spacing control circuit 1, be connected in series with limit switch XS and relay K A, described limit switch XS is normally closed contact limit switch XS, described relay K A comprises open contact and normally closed contact, the normally closed contact of described relay K A is connected in series and forms spacing disconnection warning circuit 2 with disconnection warning device and power supply, described disconnection warning device is buzzer phone 1XD, the open contact of described relay K A and spacing test button QB, detection alarm device and power supply are connected in series and form limiting detection circuit 3, spacing control circuit 1, spacing disconnection warning circuit 2 and limiting detection circuit 3 can be used same 220V power supply, described detection alarm device is buzzer phone 2XD, in described limiting detection circuit 3, the open contact of the described relay K A of series connection is controlled the pull up circuit of hoisting crane, shown in Fig. 1, described detection alarm device and disconnection warning device are except using buzzer phone, can certainly adopt other suitable warning devices, as indicator lamp and electric bell etc., adopt buzzer phone can realize sound and light alarm simultaneously, alarming effect is better, for convenience of workman's operation, spacing test button QB and spacing disconnection alarm button QA are positioned at driver's cab.

Principle of work of the present utility model is: during hoisting crane energising work, described limit switch XS is closed, relay K A keeps "on" position, now the open contact of relay K A is closed, before crane loading weight, can press spacing test button QB, shift to an earlier date the quality of detectability bit switch XS and relay K A, if the open contact of relay K A is closed in limiting detection circuit 3, limiting detection circuit 3 will be switched on, buzzer phone 2XD sends sound and light signal and reports to the police, limit switch XS and relay K A normal operation are now described, pull up circuit should be switched on, even if pull up circuit no energising also illustrates it is not the problem of relay K A and limit switch XS, the open contact of relay K A in limiting detection circuit 3 is closed, the contact of the relay K A on spacing disconnection warning circuit 2 disconnects, if relay K A goes wrong or limit switch XS goes wrong, cause the open contact of the relay K A in limiting detection circuit 3 to disconnect, the normally closed contact of the relay K A on spacing disconnection warning circuit 2 will be closed, therefore spacing disconnection warning circuit 2 will be switched on, buzzer phone 1XD will send sound and light signal and report to the police, and notifies in time staff to process.

As a kind of improved embodiment, as shown in Figure 1, on the basis of said structure, on described limit switch XS, be parallel with 1 spacing reset button QA, because can triggering limit switch XS when reaching spacing position, the weight of hoisting crane disconnects, thereby make relay K A power-off, open contact is in off-state, make pull up circuit power-off, if now want, pull up circuit being switched on again can use, in the time of now just can pressing this spacing reset button QA, relay K A continues energising, thereby pull up circuit energising is worked on, for using the limit switch of non-automatic-reset in inhibiting device or when limit switch XS damages, can this spacing reset button QA of Interim use be worked by hoisting crane at short notice, the weight poising is put into safe position, then limit switch XS is repaired.

Claims

1. spacing detection alarm device, comprise spacing control circuit, on described spacing control circuit, be connected in series with limit switch and relay, described limit switch is normally closed contact limit switch, described relay comprises open contact and normally closed contact, it is characterized in that: the normally closed contact of described relay is connected in series formation limiting detection circuit with disconnection warning device and power supply, the open contact of described relay and spacing test button, detection alarm device and power supply are connected in series formation limiting detection circuit, the open contact of the described relay of connecting in described limiting detection circuit is controlled the pull up circuit of hoisting crane.

2. spacing detection alarm device as claimed in claim 1, is characterized in that: on described limit switch, be parallel with 1 spacing reset button.

3. spacing detection alarm device as claimed in claim 1 or 2, is characterized in that: described detection alarm device and disconnection warning device are buzzer phone.