CN108896282B

CN108896282B - Circuit breaker press-pull test bench and test method

Info

Publication number: CN108896282B
Application number: CN201810421127.9A
Authority: CN
Inventors: 路士州; 朱宝宇; 刘成城; 王浩然; 亓佳慧; 隆逸洲; 赵玉佩
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2018-05-04
Filing date: 2018-05-04
Publication date: 2019-12-24
Anticipated expiration: 2038-05-04
Also published as: CN108896282A

Abstract

The invention relates to a circuit breaker press-pull test bench and a test method, which solve the technical problems of low efficiency, high cost and low accuracy of the existing press-pull type circuit breaker test process, and comprise a shell, a PLC (programmable logic controller), a two-position five-way electromagnetic valve, a cylinder and a clamp, wherein the cylinder is connected with a first magnetic switch and a second magnetic switch, and a telescopic rod of the cylinder is connected with a magnetic ring; the first magnetic switch and a first coil on the two-position five-way electromagnetic valve are connected in series and then connected between a first voltage pulse output port and a GND port of the PLC controller, and the second magnetic switch and a second coil on the two-position five-way electromagnetic valve are connected in series and then connected between a second voltage pulse output port and the GND port of the PLC controller; the node between the first magnetic switch and the first coil of the two-position five-way electromagnetic valve and the node between the second magnetic switch and the second coil of the two-position five-way electromagnetic valve are connected to the first switching value input port and the second switching value input port of the PLC, and the air outlet of the two-position five-way electromagnetic valve is connected with the air cylinder. The invention is widely applied to the technical field of reliability test of circuit breakers.

Description

Circuit breaker press-pull test bench and test method

Technical Field

The invention relates to a reliability test of a circuit breaker in the technical field of aerospace, in particular to a circuit breaker press-pull test bench and a test method.

Background

The main brand of the push-pull circuit breaker is KLIXON, and the following websites are specifically seen, http:// www.aictrade.com/Product show. asp? ID 117.

https://detail.1688.com/offer/541112760197.html？spm＝a312h.7841636.1998813769.d_pic_5.umUbYr。

In the production process of the press-pull type circuit breaker, the circuit breaker needs to be subjected to on-off test for multiple times in a circulating mode, a press-pull cap of the circuit breaker is repeatedly pulled out and pressed back during the test, and the press-pull cap drives a tripping mechanism in the circuit breaker to act to achieve on-off of a product. At present, the press-pull test of the circuit breakers is mainly that an operator manually checks the circuit breakers one by one or by using a simple tool to identify the damaged circuit breakers. This has the technical problems of low efficiency, high cost and low accuracy.

Disclosure of Invention

The invention aims to solve the technical problems of low efficiency, high cost and low accuracy of the existing press-pull type circuit breaker testing process, and provides a circuit breaker press-pull testing test bed and a testing method with high efficiency, low cost and high accuracy.

The technical scheme includes that the circuit breaker press-pull test bench comprises a shell, a PLC (programmable logic controller), a two-position five-way electromagnetic valve, a first magnetic switch, a second magnetic switch, an air cylinder, a hanging plate and a clamp, wherein the PLC and the two-position five-way electromagnetic valve are connected to the shell, the first magnetic switch and the second magnetic switch are connected with the air cylinder, and a telescopic rod of the air cylinder is connected with a magnetic ring;

the clamp comprises a front baffle, a bottom plate, a first baffle locking handle, a second baffle locking handle, a first side plate, a second side plate, a rear baffle and a partition plate, wherein the front baffle is connected with the bottom plate through a hinge, the first side plate and the second side plate are respectively and vertically connected with two ends of the bottom plate, the rear baffle is vertically connected with the bottom plate, and two ends of the rear baffle are respectively connected with the first side plate and the second side plate; at least one partition plate is vertically connected between the rear baffle plate and the bottom plate, and the partition plate, the first side plate, the second side plate, the rear baffle plate and the bottom plate are connected to form a circuit breaker placing groove; the rear baffle is provided with a positioning hole for a pressing and pulling cap of the circuit breaker, the first baffle locking handle and the second baffle locking handle respectively penetrate through the front baffle to be connected with the first side plate and the second side plate, and the front baffle is provided with an extrusion part; the hanging plate comprises a cylinder connecting part and a breaker connecting part which are connected together, the breaker connecting part is provided with a hanging groove, and the cylinder connecting part is fixedly connected with a telescopic rod of the cylinder; the bottom plate is connected with the shell;

one joint of the first magnetic switch is connected with a first voltage pulse output port of the PLC, the other joint of the first magnetic switch is connected with a first coil on the two-position five-way electromagnetic valve, and the first coil on the two-position five-way electromagnetic valve is connected with a GND port of the PLC; one joint of the second magnetic switch is connected with a second voltage pulse output port of the PLC, the other joint of the second magnetic switch is connected with a second coil on the two-position five-way electromagnetic valve, and the second coil on the two-position five-way electromagnetic valve is connected with a GND port of the PLC; the node between the first magnetic switch and the first coil of the two-position five-way electromagnetic valve is connected with a first switching value input port of the PLC controller, the node between the second magnetic switch and the second coil of the two-position five-way electromagnetic valve is connected with a second switching value input port of the PLC controller, and a positive action air outlet and a reverse action air outlet of the two-position five-way electromagnetic valve are connected with the air cylinder through pipelines.

Preferably, the shell is connected with an electric proportional valve, and an air outlet of the electric proportional valve is connected with an air inlet of the two-position five-way electromagnetic valve through a pipeline; and a control signal output end of the PLC is connected with the electric proportional valve.

Preferably, the clip further comprises a first clip locking handle and a second clip locking handle for connecting the base plate and the housing together.

Preferably, the two ends of the bottom plate are connected with a first handle and a second handle.

Preferably, the circuit breaker press-pull test bench further comprises a touch screen, and the touch screen is connected with the PLC.

Preferably, the PLC controller is connected with a key switch and a signal lamp.

Preferably, the pressing part is provided with a triangular pressing groove, a trapezoidal pressing groove, an interrupted triangular pressing groove, or a pressing block.

The invention also provides a test method using the breaker push-pull test bench, which comprises the following steps:

the method comprises the following steps that firstly, a circuit breaker to be tested is prepared, a front baffle of a clamp is opened, a plurality of circuit breakers are placed in a plurality of circuit breaker placing grooves of the clamp, a press-pulling cap on the circuit breaker penetrates through a circuit breaker press-pulling cap positioning hole, then the front baffle is closed, a first baffle locking handle and a second baffle locking handle are used for locking the front baffle, an extrusion part on the front baffle abuts against a protruding part on the tail part of the circuit breaker, and the circuit breaker in the circuit breaker placing grooves is fixed;

secondly, the clamps with the mounted row of circuit breakers are placed on the shell and fixedly connected, and the ring groove on the press-pull cap of each circuit breaker is clamped into the hanging groove of the hanging plate;

thirdly, starting the work, setting the number N of pressing and pulling actions on the PLC, outputting a voltage pulse A from a voltage pulse output port of the PLC, outputting a voltage pulse B from a voltage pulse output port of the PLC, driving the cylinder to work, extending and retracting the telescopic rod of the cylinder back and forth to drive the hanging plate to reciprocate back and forth, and driving the pressing and pulling cap of the circuit breaker to be repeatedly pulled out and pressed in by the hanging plate;

fourthly, the PLC reads a feedback pulse signal a received by the first switching value input port and reads a feedback pulse signal b received by the second switching value input port;

fifthly, the PLC calculates the pulse times of the feedback pulse signal a and the feedback pulse signal b;

sixthly, judging that the breaker breaks down if the first switching value input port or the second switching value input port cannot receive the pulse signal, and controlling the cylinder to stop acting by the PLC;

and seventhly, an operator opens a front baffle of the clamp and confirms to take out the damaged circuit breaker by hands.

Preferably, after the seventh step, the front baffle is installed again, the PLC controller controls the cylinder to operate, and the test is continued until the pulse number P of the feedback pulse signal a or the pulse number Q of the feedback pulse signal b reaches the set value N.

The invention has the beneficial effects that: the working frequency, the cycle times and the interval time of the test bed are adjustable. The test bed is small in size, low in energy consumption, capable of testing a plurality of circuit breakers simultaneously, high in working efficiency, high in accuracy, easy to control, high in intelligentization and automation degree, low in cost and capable of guaranteeing product quality. The test bench can be used for testing different types of circuit breakers only by replacing corresponding clamps, and the drawing stress points can be consistent without changing the position of the cylinder.

Further features of the invention will be apparent from the description of the embodiments which follows.

Drawings

FIG. 1 is a perspective view of a circuit breaker pull-out test stand;

FIG. 2 is a rear view of a circuit breaker pull-out test stand;

FIG. 3 is a schematic view of the structure of FIG. 1 with the upper cover removed to show internal structure;

figure 4 is a schematic view of the circuit breaker product of the configuration shown in figure 3, with the circuit breaker removed;

FIG. 5 is a perspective view of a fixture with a row of circuit breakers mounted thereon;

FIG. 6 is a right side view of the structure shown in FIG. 5;

FIG. 7 is a schematic view of the structure of FIG. 5 with the front wall of the clamp open;

FIG. 8 is a perspective view of the clamp;

FIG. 9 is a perspective view of the clamp;

FIG. 10 is an enlarged view of a portion of FIG. 7 at A;

FIG. 11 is a front view of the peg board;

FIG. 12 is a right side view of the peg board;

figure 13 is a perspective view of the circuit breaker of figure 5;

figure 14 is a schematic diagram of a configuration in which a row of circuit breakers is mounted on a fixture;

FIG. 15 is a schematic view of the cylinder connecting the first magnetic switch and the second magnetic switch;

FIG. 16 is a schematic structural view of a magnet ring mounted on a telescopic rod of an air cylinder;

FIG. 17 is an electrical connection diagram of the control part of the circuit breaker pull-out test stand

FIG. 18 is a flow chart of a normal operating mode of the circuit breaker pull-out test stand;

FIG. 19 is a flow chart of fault detection;

FIG. 20 is a waveform diagram of two sets of level signals output by the PLC controller;

FIG. 21 is a modified form of the clamp;

FIG. 22 is a schematic view of the front baffle of the structure of FIG. 21;

figure 23 is a schematic diagram of a circuit breaker with which the clamp of figure 21 is adapted;

FIG. 24 is another alternative configuration of the clamp;

FIG. 25 is a schematic view of the construction of the front baffle of the construction of FIG. 24;

figure 26 is a schematic diagram of a circuit breaker suitable for use with the clamp of figure 24;

FIG. 27 is another alternative configuration of the clamp;

FIG. 28 is another alternative configuration of the clamp;

fig. 29 is a waveform diagram of an output voltage pulse a from a voltage pulse output port of the PLC controller and a waveform diagram of a pulse signal received by a first switching value input port Y1.

The symbols in the drawings illustrate that:

1. the device comprises a shell, a plane part 101, an upper cover 2, a power supply module 3, a PLC controller 4, a touch screen 5, a key switch 6, a signal lamp 7, a two-position five-way electromagnetic valve 8, an electric proportional valve 9, a first magnetic switch 10-1, a second magnetic switch 10-2, an air cylinder 11-1, an expansion rod 12, a clamp 1201, a front baffle 1201-1, an extrusion part 1201-1, a triangular extrusion groove 1201-1, a second baffle locking handle mounting hole 1201-1-2, a bottom plate 1202, a circuit breaker placing groove 1203, a first clamp locking handle 1204, a second clamp locking handle 1205, a second clamp locking handle 1206, a first baffle locking handle 1207, a second baffle locking handle 1208, a first side plate 1209, a second side plate 1210, a rear baffle 1210-1, a circuit breaker pressing cap positioning hole 1210-1, 1211. partition, 1212 hinge, 1213 first handle, 1214 second handle; 13. the suspension plate, 1301, the cylinder connecting part, 1302, the breaker connecting part and 1302-1, a suspension groove; 14. the circuit breaker comprises a circuit breaker body, 1401, a press-pull cap, 1401-1, a ring groove, 1402, a first connecting terminal, 1403, a second connecting terminal, 1404 and a triangular protruding portion; 15. relay, 16. magnetic ring; 17. the circuit breaker comprises a breaker, 17-1 parts of trapezoidal convex parts, 18 parts of clamps, 18-1 parts of front baffles, 18-1-1 parts of trapezoidal extrusion grooves, 19 parts of circuit breakers, 19-1 parts of rectangular convex parts, 20 parts of clamps, 20-1 parts of front baffles and 20-1-1 parts of rectangular extrusion parts; 21. the fixture comprises a fixture, 21-1 parts of a front baffle, 21-1-1 parts of an interrupted triangular extrusion groove, 22 parts of the fixture, 22-1 parts of the front baffle and 22-1-1 parts of an extrusion block.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments thereof with reference to the attached drawings.

As shown in fig. 1-4, the circuit breaker press-pull test bench comprises a housing 1, an upper cover 2, a power module 3, a PLC controller 4, a touch screen 5, a key switch 6, a signal lamp 7, a two-position five-way solenoid valve 8, an electric proportional valve 9, a first magnetic switch 10-1, a second magnetic switch 10-2, an air cylinder 11 and a clamp 12. The upper cover 2 is connected with the shell 1, the power module 3, the PLC 4, the two-position five-way electromagnetic valve 8, the electric proportional valve 9 and the air cylinder 11 are installed in the shell 1, the first magnetic switch 10-1 and the second magnetic switch 10-2 are installed on the air cylinder, and the upper cover 2 covers all units in the shell. The touch screen 5, the key switch 6 and the signal lamp 7 are mounted on the upper cover 2, and the units are connected together through cables. The clamp 12 is installed at the outer side of the housing 1, and the clamp 12 is used for fixing the circuit breaker to be tested.

As shown in fig. 5-9, 3 and 4, the clip 12 includes a front baffle 1201, a bottom plate 1202, a first clip locking handle 1204, a second clip locking handle 1205, a first baffle locking handle 1206, a second baffle locking handle 1207, a first side plate 1208, a second side plate 1209, a back baffle 1210, a partition 1211, a hinge 1212, a first handle 1213, and a second handle 1214, wherein the front baffle 1201 is connected to the bottom plate 1202 through the hinge 1212, the first clip locking handle 1204 and the second clip locking handle 1205 are respectively connected to two ends of the bottom plate 1202, and the first clip locking handle 1204 and the second clip locking handle 1205 are used to fixedly connect (by screwing) the bottom plate 1202 to the housing 1. The first side plate 1208 and the second side plate 1209 are respectively connected to two ends of the bottom plate 1202 vertically, the bottom of the back plate 1210 is connected to the bottom plate 1202 vertically, and two ends of the back plate 1210 are respectively connected to the first side plate 1208 and the second side plate 1209. A plurality of baffles 1211 are vertically connected between the back panel 1210 and the base panel 1202. The back baffle 1210 is provided with a plurality of positioning holes 1210-1 for the press-pull cap of the circuit breaker. A plurality of partitions 1211 divide the first side plate 1208, the second side plate 1209, the back plate 1210, and the bottom plate 1202 into a plurality of circuit breaker placement slots 1203. First baffle locking handle 1206, second baffle locking handle 1207 pass the hole at preceding baffle 1201 both ends respectively and adopt the mode of revolving soon to be connected with first curb plate 1208, second curb plate 1209 for fix the circuit breaker in the circuit breaker standing groove 1203. As shown in fig. 10, the front baffle 1201 is provided with an extrusion part 1201-1, and the extrusion part 1201-1 is provided with a triangular extrusion groove 1201-1-1; the right end of the squeezing portion 1201-1 is provided with a second baffle locking handle mounting hole 1201-1-2 for mounting a second baffle locking handle 1207, and the left end of the squeezing portion 1201-1 is provided with a first baffle locking handle mounting hole for mounting a first baffle locking handle. A first handle 1213 and a second handle 1214 are respectively connected to the two ends of the bottom plate 1202, and the first handle 1213 and the second handle 1214 are used to facilitate the operator to move the whole clamp.

As shown in fig. 11 and 12, the hanging plate 13 includes a cylinder connecting portion 1301 and a circuit breaker connecting portion 1302 connected together, and the circuit breaker connecting portion 1302 is provided with a plurality of hanging grooves 1302-1. The cylinder connection portion 1301 is fixedly connected with the telescopic rod of the cylinder 11.

As shown in fig. 13, the circuit breaker 14 is provided with a push-pull cap 1401, a first terminal 1402, a second terminal 1403 and a triangular protruding portion 1404, wherein the first terminal 1402, the second terminal 1403 and the triangular protruding portion 1404 are located at the tail of the circuit breaker. The push-pull cap 1401 is provided with a ring groove 1401-1.

As shown in fig. 15, the first and second magnetic switches 10-1 and 10-2 are mounted on the housing of the cylinder 11. As shown in fig. 16, a magnet ring 16 is installed on the extension rod 11-1 of the cylinder 11, and the magnet ring 16 is used for operating the magnetic switch.

As shown in fig. 17, the first magnetic switch 10-1 and the second magnetic switch 10-2 are of a two-wire system, one joint of the first magnetic switch 10-1 is connected with a first voltage pulse output port of the PLC controller 4, the other joint is connected with one lead of a first coil on the two-position five-way solenoid valve 8, the other lead of the first coil is connected with a GND port of the PLC controller 4, and the first magnetic switch 10-1 and the first coil of the two-position five-way solenoid valve 8 are connected in series; one joint of the second magnetic switch 10-2 is connected with a voltage pulse output port II of the PLC controller 4, the other joint is connected with a second coil on the two-position five-way electromagnetic valve 8, the second coil is connected with a GND port of the PLC controller 4, and the second magnetic switch 10-2 and the second coil of the two-position five-way electromagnetic valve 8 are connected in series. The node between the first magnetic switch 10-1 and the first coil of the two-position five-way solenoid valve 8 is connected to the first switching value input port Y1 of the PLC controller 4, that is, the feedback signal a is connected to the first switching value input port Y1 of the PLC controller 4. The node between the second magnetic switch 10-2 and the second coil of the two-position five-way solenoid valve 8 is connected to the second switching value input port Y2 of the PLC controller 4, that is, the feedback signal b is connected to the second switching value input port Y2 of the PLC controller 4. An air outlet of the electric proportional valve 9 is connected with an air inlet of the two-position five-way electromagnetic valve 8 through a pipeline, and a positive action air outlet and a reverse action air outlet of the two-position five-way electromagnetic valve 8 are connected with the air cylinder 11 through pipelines.

The control signal output end of the PLC 4 is connected with an electric proportional valve 9. The gas input end of the two-position five-way electromagnetic valve 8 is connected with the gas output end of the electric proportional valve 9, the gas output end of the two-position five-way electromagnetic valve 8 is connected with the cylinder 11, and the gas input end of the electric proportional valve 9 is connected with an external gas pump. Under the control of the PLC 4, the electric proportional valve 9 outputs adjustable air pressure to the air cylinder 11 through the two-position five-way electromagnetic valve. The two-position five-way electromagnetic valve 8 adopts a double electric control mode.

The power module 3 is connected with the PLC 4, and the power module 3 is used for supplying power to each module. The touch screen 5 is connected with the PLC 4, the key switch 6 is connected with the PLC 4, and the signal lamp 7 is connected with the PLC 4. The touch screen 5 is used as a man-machine interaction unit and can input control instructions and display process parameters and test results. The key switch 6 is used as a start switch, a pause switch and a stop switch of the test board. The signal lamp 7 can display the working state of the test bench.

The side of the shell 1 is connected with a main power switch, an air pressure input interface and an air pressure output interface, the air pressure output interface is connected with an air path of the two-position five-way electromagnetic valve, and the air pressure input interface is connected with an air filter. The two sides of the shell 1 are provided with heat dissipation holes. The main power switch is connected with the input end of the power module 3 through an air switch, and the two-position five-way electromagnetic valve 8 and the electric proportional valve 9 are respectively connected with the direct-current voltage output end of the switch power supply through solid-state relays.

Referring to fig. 18 and 19, the operation of the circuit breaker pull-out test stand is described as follows:

firstly, a circuit breaker 14 to be tested is prepared, a front baffle 1201 of a clamp 12 is opened (as shown in the states of fig. 8 and 9), a plurality of circuit breakers 14 are taken and placed into a plurality of circuit breaker placing grooves 1203 of the clamp 12, a push-pull cap 1401 on the circuit breaker 14 penetrates through a circuit breaker push-pull cap positioning hole 1210-1, then the front baffle 1201 is closed, the front baffle 1201 is locked by a first baffle locking handle 1206 and a second baffle locking handle 1207, a triangular extrusion groove 1201-1-1 on the front baffle 1201 is pressed against a triangular bulge 1404 at the tail part of the circuit breaker 14, and therefore the circuit breaker 14 in the circuit breaker placing groove 1203 is fixed.

In the second step, the jig 14 with the mounted row of circuit breakers is placed on the plane portion 101 of the housing 1, and the ring groove 1401-1 of the push-pull cap 1401 of each circuit breaker 14 is engaged with the corresponding hanging groove 1302-1 of the hanging plate 13. The bottom plate 1202 of the clip 14 is fixedly connected to the flat surface 101 of the housing 1 by a first clip locking handle 1204 and a second clip locking handle 1205, as shown in fig. 3 and 14.

And thirdly, pressing down a key switch on the test bed, starting to work, inputting the pressing and pulling action times on the touch screen, driving the cylinder 11 to work by the PLC 4, stretching and retracting the telescopic rod of the cylinder 11 back and forth for multiple times to drive the hanging plate 13 to reciprocate, and driving the pressing and pulling cap 1401 of the circuit breaker to be repeatedly pulled out and pressed in by the hanging plate 13 for multiple times in a circulating manner. Thereby performing mechanical performance test of the press-pull cap. The specific process of the PLC controller 4 driving the cylinder 11 is that, referring to fig. 20, when the output voltage pulse a is at a high level, the voltage pulse B is at a low level; when the output voltage pulse a is low, the voltage pulse B is high. When the voltage pulse A rises from a low level to a high level, the circuit of the first magnetic switch 10-1 is conducted, the first coil on the two-position five-way electromagnetic valve 8 is electrified, the telescopic rod of the air cylinder 11 extends forwards, and the circuit of the second magnetic switch 10-2 is disconnected at the moment. When the voltage pulse B rises from a low level to a high level, the circuit of the second magnetic switch 10-2 is turned on, the second coil on the two-position five-way electromagnetic valve 8 is energized, the telescopic rod of the air cylinder 11 retracts backwards, the circuit of the first magnetic switch 10-1 is turned off at this time, and the first coil on the two-position five-way electromagnetic valve 8 is de-energized. In short, the two coils of the two-position five-way electromagnetic valve 8 are alternately electrified through the two magnetic switches to control the action of the air cylinder. When the telescopic rod of the air cylinder 11 extends, the pressing and pulling cap of the circuit breaker is pressed in, and a feedback signal a is sent to a first switching value input port Y1 of the PLC 4; when the telescopic rod of the cylinder 11 retracts, the press-pull cap of the circuit breaker is pulled out, and the feedback signal b is sent to the second switching value input port Y2 of the PLC controller 4.

The number of times of the pressing and pulling actions is defined as N, N is a natural number, and 1 pressing and pulling action is the extending and retracting action of the telescopic rod of the air cylinder, which corresponds to one period of the output voltage pulse a and one period of the output voltage pulse B of the PLC controller shown in fig. 20. As shown in fig. 29, each rising edge of the output voltage pulse a corresponds to the feedback pulse signal received by the first switching value input port Y1. Similarly, each rising edge of the output voltage pulse B corresponds to the feedback pulse signal received by the second switching value input port Y2.

As shown in fig. 19, the test procedure is:

step 1, setting the number N of pressing and pulling in a PLC controller.

And 2, outputting a voltage pulse A and a voltage pulse B by the PLC, wherein the voltage pulse A has N rising edges, and the voltage pulse B has N rising edges.

And 3, reading the feedback pulse signal a received by the first switching value input port Y1 and reading the feedback pulse signal b received by the second switching value input port Y2 by the PLC.

And 4, calculating the pulse frequency P of the feedback pulse signal a and the pulse frequency Q of the feedback pulse signal b by the PLC, wherein before the actual press-pulling frequency does not reach the set frequency, when the press-pulling cap of one breaker in a row cannot be pressed in or pulled out, the first switching value input port Y1 or the second switching value input port Y2 cannot receive the pulse signal, and the pulse frequency P of the feedback pulse signal a is not accumulated or the pulse frequency Q of the feedback pulse signal b is not accumulated.

Step 5, if the first switching value input port Y1 or the second switching value input port Y2 cannot receive the pulse signal, judging that the breaker breaks down, and entering step 6; otherwise, jumping to step 8.

And 6, the PLC controls the cylinder to stop acting, and information is displayed through a fault indicator lamp and a touch screen to prompt the occurrence of a fault.

And 7, opening the front baffle of the clamp by an operator, confirming which one of the circuit breakers has a fault by hands, taking out the damaged circuit breaker by taking out the damaged circuit breaker and putting the front baffle back again, wherein the fault comprises that the pressing plate cap cannot be pulled out or pressed into the circuit breaker. And (3) pressing a key switch of the upper cover (the fault indicator lamp is turned off), controlling the air cylinder to act by the PLC, and continuing to test until the pulse frequency P of the feedback pulse signal a or the pulse frequency Q of the feedback pulse signal b reaches a set value N or the power supply is emergently stopped and cut off by a worker.

And 8, when the pulse frequency P of the feedback pulse signal a or the pulse frequency Q of the feedback pulse signal b reaches N, the task completion indicator lamp is turned on, and the test bed stops working.

And fourthly, after the test is finished, loosening the first baffle locking handle 1206 and the second baffle locking handle 1207, opening the front baffle 1201 and taking out a plurality of tested circuit breakers. And loading the next group of circuit breakers to be tested, and carrying out pull-out and pull-out tests for multiple times.

The electric proportional valve 9 can adjust the air pressure supplied to the air cylinder under the control of the PLC 4, so that the telescopic rod of the air cylinder is adjusted to drive the drawing force generated by the hanging plate 13, and the test requirements of different conditions or different specifications and models of circuit breakers are met.

As shown in fig. 23, the circuit breaker 17 is another specification type, and the tail portion thereof has a trapezoidal convex portion 17-1. As shown in fig. 21-22, a clamp 18 for a circuit breaker 17 includes a front bezel 18-1, the front bezel 18-1 having a trapezoidal crush slot 18-1-1 that mates with the trapezoidal boss 17-1.

As shown in fig. 26, the circuit breaker 19 is of another specification type, and the tail portion thereof has a rectangular boss portion 19-1. As shown in fig. 24-25, a clamp 20 for a circuit breaker 19 includes a front baffle 20-1, the front baffle 20-1 having a trapezoidal extrusion 20-1-1 that mates with the trapezoidal protrusion 17-1.

As shown in FIG. 27, the clamp 21 is another structure, which comprises a front baffle 21-1, wherein the front baffle 21-1 is provided with an intermittent triangular extrusion groove 21-1-1.

As shown in FIG. 28, another structural jig 22 includes a front fender 22-1, and the front fender 22-1 is provided with a pressing block 22-1-1.

It should be noted that the PLC controller may also be replaced by a single chip, an ARM chip, or a DSP chip.

The above description is only for the purpose of illustrating preferred embodiments of the present invention and is not to be construed as limiting the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention.

Claims

1. A circuit breaker press-pull test bench is characterized by comprising a shell, a PLC (programmable logic controller), a two-position five-way electromagnetic valve, a first magnetic switch, a second magnetic switch, an air cylinder, a hanging plate and a clamp, wherein the PLC and the two-position five-way electromagnetic valve are connected to the shell, the first magnetic switch and the second magnetic switch are connected with the air cylinder, and a telescopic rod of the air cylinder is connected with a magnetic ring;

2. The circuit breaker press-pull test bench of claim 1, wherein an electric proportional valve is connected to the housing, and an air outlet of the electric proportional valve is connected with an air inlet of a two-position five-way electromagnetic valve through a pipeline; and a control signal output end of the PLC is connected with the electric proportional valve.

3. The circuit breaker pulldown test rig as recited in claim 1, wherein the clamp further comprises a first clamp locking handle and a second clamp locking handle for coupling the base plate and the housing together.

4. The circuit breaker pull-down test bench of claim 1, wherein a first handle and a second handle are connected to both ends of the base plate.

5. The circuit breaker press-pull test bench of claim 1, further comprising a touch screen, wherein the touch screen is connected to the PLC controller.

6. The circuit breaker press-pull test bench of claim 5, wherein the PLC controller is connected with a key switch and a signal lamp.

7. The circuit breaker press-pull test bench of claim 1, wherein the extrusion portion is provided with a triangular extrusion groove, a trapezoidal extrusion groove, an interrupted triangular extrusion groove or an extrusion block.

8. A testing method using the circuit breaker pull-down test stand of claim 1, comprising the steps of:

9. The method according to claim 8, wherein after the seventh step, the front baffle is installed again, and the PLC controller controls the cylinder to operate to continue the test until the pulse number P of the feedback pulse signal a or the pulse number Q of the feedback pulse signal b reaches a set value N.