A travel switch parameter testing device and testing method

Abstract

The present invention discloses a travel switch parameter testing device, comprising a base, a bottom plate provided on the base, a rear plate provided on one side of the bottom plate, a top plate provided on the top of the rear plate, a screw rod mounting seat provided between the top plate and the bottom plate, the screw rod mounting seat comprising a vertical first support block, a second support block and a third support block provided at both ends of the first support block, a screw rod provided between the second support block and the third support block, a slider, a detection head of a long grating displacement sensor and a movable plate provided on the screw rod in sequence, a detection guide rail of the long grating displacement sensor provided on the first support block, a pressure sensor and a metal pressure head provided on the bottom surface of the movable plate in sequence, a travel switch test seat provided on the bottom plate directly below the metal pressure head, and an electrical box provided on the bottom plate. This device is simple to operate, safe and reliable, has low proficiency requirements for test personnel, short testing time, high efficiency, a wide variety of test parameters, reduces labor consumption, can effectively improve test accuracy, and reduce measurement errors.

Description

Technical Field

[0001] The invention relates to travel switch test auxiliary equipment, in particular to a travel switch parameter test equipment and a test method. Background Art

[0002] With the rapid development of the travel switch industry, there are more and more types of travel switches, and their overall appearance and structure are becoming more and more complex. Each type of travel switch requires testing of multiple travel parameters and force parameters. Currently, the parameter testing of travel switches is mostly done manually by testers using a handheld vernier caliper or dynamometer. Therefore, the following deficiencies exist in the testing process:

[0003] a) There are many parameters that need to be tested for limit switches. The manual testing steps are complicated and difficult to operate, which requires a high level of proficiency of the tester;

[0004] b) Manual testing, reading and recording parameters takes a long time, has poor accuracy, low efficiency, high workload for testers, and high labor consumption;

[0005] c) Each travel switch needs to be manually zeroed at the start of the test, but the tester cannot accurately control the zero position of each travel switch. As a result, the test accuracy is low, the product defect rate is high, and the test parameter errors are large. Summary of the Invention

[0006] The present invention addresses the shortcomings of the prior art by providing a device and method for testing parameters of a travel switch. This device is simple to operate, safe and reliable, requires minimal proficiency from the tester, shortens testing time, is highly efficient, and can test a wide variety of parameters. The device allows for user-selectable test parameters and records and outputs test results, significantly reducing labor consumption. Furthermore, the device features an automatic zeroing function and high-precision CNC stepper motor drive control, effectively improving test accuracy and reducing measurement errors.

[0007] The technical solution for achieving the purpose of the present invention is:

[0008] A travel switch parameter testing device comprises a base with an upper opening, a bottom plate for covering the base is provided at the base opening, a motor with a pulley is provided on the bottom surface of the bottom plate, the motor is placed in the inner cavity of the base, a back plate is provided on one side of the bottom plate and is perpendicular to the bottom plate, a top plate is provided on the top of the back plate and is in the same direction as the bottom plate, a screw mounting seat is provided between the top plate and the bottom plate, the screw mounting seat comprises a first support block vertically close to the inner side of the back plate, a second support block and a third support block are respectively provided at both ends of the first support block, which are perpendicular to the first support block and respectively abut against the bottom plate and the top plate, the second support block and the third support block are both in the same direction as the top plate, a screw is provided between the second support block and the third support block, the screw passes through the second support block and is connected to the pulley of the motor, and the third support block extends to the second support block A slider, a detection head of a long grating displacement sensor and a stepped moving plate are sequentially arranged on the lead screw in the direction of the moving plate. The lead screws all pass through the slider, the detection head of the long grating displacement sensor and the moving plate. A detection guide rail of the long grating displacement sensor in the same direction as the second support block is provided on the first support block, wherein the detection head of the long grating displacement sensor and the detection guide rail of the long grating displacement sensor constitute a long grating displacement sensor. A pressure sensor and a metal pressure head are sequentially arranged on the bottom surface of the step facing the bottom plate. A travel switch test seat is arranged on the bottom plate just below the metal pressure head. The axis of the metal pressure head and the axis of the travel switch test seat are in the same straight line. A drag chain transmission track and a drag chain arranged on the drag chain transmission track are provided on the inner wall of the rear plate. An electrical box is also provided on the bottom plate.

[0009] The electrical box includes a shell, in which a PLC controller connected to a power supply, an AD sensor conversion module and a motor driver are arranged. The shell is provided with a display screen, a zero adjustment indicator light, a contact signal line wire port, a contact indicator light and an operation button, wherein the contact signal line wire port is located at an interface on the outside of the shell and is externally connected to multiple groups of contact wires and a group of zero adjustment wires. A group of contact wires and a zero adjustment wire respectively include two contact wires and a zero adjustment wire. The outer end of each contact wire is connected to a conductive clip. A group of contact wires and a zero adjustment wire respectively correspond to the contact signal line wire port located at an interface on the inside of the shell and are connected to a contact indicator light and a zero adjustment indicator light through wires, that is, two contact wires are connected to a contact indicator light, and two zero adjustment wires are connected to a zero adjustment indicator light, thereby forming a loop. The motor driver is connected to the motor through wires, the AD sensor conversion module is connected to the pressure sensor and the PLC controller through signal lines, the PLC controller is connected to the long grating displacement sensor, the display screen, the contact indicator light, the zero adjustment indicator light and the operation button through signal lines, and the display screen is externally connected to a computer.

[0010] The signal lines of the long grating displacement sensor and the pressure sensor are placed in the drag chain. When the equipment is working, the signal lines are not easy to bend or knot during the test, thereby better ensuring the smoothness of the test process and the stability of signal transmission.

[0011] The end of the screw rod passing through the second support block is sequentially provided with a first deep groove ball bearing, a thrust ball bearing and a second deep groove ball bearing, and the first deep groove ball bearing is close to the pulley of the motor; the end of the screw rod passing through the third support block is provided with a third deep groove ball bearing.

[0012] The contact signal wire port is located at the interface outside the shell and is connected to multiple groups of contact wires and a group of zero adjustment wires. A group of contact wires and a group of zero adjustment wires respectively include two contact wires and a zero adjustment wire. The outer end of each contact wire is connected to a conductive clip, which increases the test types of the travel switch.

[0013] The number of the contact signal line wire ports located on the outside of the housing is the same as the sum of the number of the contact wires and the zero adjustment wires.

[0014] The lengths of the contact wire and the zero adjustment wire are both greater than the maximum displacement of the long grating displacement sensor, thereby preventing the contact wire and the zero adjustment wire from being pulled due to the movement of the detection head of the long grating displacement sensor.

[0015] The operation buttons include emergency stop, rise, fall, stop, manual reset and start test, and the operation buttons are used for manual testing.

[0016] The first support block, the second support block and the third support block are integrally formed to form a screw mounting seat.

[0017] The motor is a stepping motor.

[0018] A method for testing a travel switch parameter testing device includes the above-mentioned travel switch parameter testing device, and the method includes the following steps:

[0019] 1) Place the travel switch to be tested on the travel switch test seat;

[0020] 2) Connect the two zero adjustment wires to the metal pressure head and the test button of the travel switch respectively, and connect the conductive clip to the contact connector of the travel switch;

[0021] 3) Turn on the power, computer, and display. The motor driver controls the motor to work in the forward direction, driving the lead screw to rotate. The detection head, slider, and moving plate of the long grating displacement sensor on the lead screw rotate along with the lead screw, thereby driving the metal indenter downward. When the metal indenter contacts the test button of the travel switch, the metal indenter and the travel switch form a loop through the zeroing wire to adjust the force and displacement values ​​to zero.

[0022] 4) The metal indenter continues to move downward as the screw rotates. The downward movement of the metal indenter generates pressure to test the travel switch. At the same time, the pressure sensor starts to calculate the pressure parameters, and the long grating displacement sensor calculates the displacement.

[0023] 5) When the actual test value of the pressure sensor reaches the set movement value of the PLC controller, the motor driver controls the motor to work in reverse, and the pressure sensor on the metal pressure head moves up to the initial position following the screw rod, completing the test of the current travel switch.

[0024] Working principle:

[0025] During the test, when the metal indenter touches the test button of the travel switch, a loop is formed between the two zeroing wires and the zeroing indicator light is lit. At this time, the equipment will clear the displacement parameters and then use the long grating displacement sensor to collect the displacement signal; the PLC controller is mainly used to control the up and down movement of the pressure sensor on the metal indenter and stop the return action, and then the AD sensor conversion module converts the electrical signal parameters obtained through the test into digital signals and displays them on the display.

[0026] The advantages of this technical solution are:

[0027] 1. This technical solution adopts CNC stepper motor to control the transmission, realizes the automatic pressing measurement of the pressure sensor, changes the status quo of manual test records, realizes the semi-automatic test of the travel switch, greatly reduces the work intensity of the testers, and reduces labor consumption.

[0028] 2. This technical solution uses a long grating displacement sensor and a pressure sensor to collect displacement signals and force signals during the test process, and digitally displays the displacement signals and force signals through circuit signal transmission and AD sensor conversion modules, realizing automatic reading and automatic storage of test parameters, thereby effectively reducing test time and greatly improving test efficiency and test accuracy.

[0029] 3. This technical solution has the function of automatically adjusting the zero test starting point. When the metal indenter touches the test button of the travel switch, a loop signal will be formed and the zero indicator light will be lit, so that the equipment will automatically zero the displacement data and start recording the displacement parameters. This can more effectively improve the test accuracy, reduce the product defect rate, and reduce measurement errors.

[0030] 4. This technical solution uses a PLC controller to control the operation of the metal indenter, which can automatically determine the operation and stop of the test to realize automated testing, and uses multiple sets of contact wires and indicator lights to connect and display the normally closed and normally open states of multiple contacts of the travel switch, thereby adapting to the measurement of multiple displacement parameters of different travel switches, and the tester can select the required test parameters by himself, which makes the test process more convenient, the range of test parameters is wider, and the functionality is stronger.

[0031] 5. This technical solution has a compact structure, is easy to assemble and disassemble, safe and reliable, and simple to operate, and has low requirements on the proficiency of the testers.

[0032] This equipment is simple to operate, safe and reliable, has low requirements on the proficiency of the testers, short testing time, high efficiency, a wide range of test parameters, and can automatically select the test parameter types and record and output test results, thereby greatly reducing labor consumption. At the same time, the equipment also has an automatic zeroing function and high-precision CNC stepper motor transmission control, which can effectively improve test accuracy and reduce measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of an embodiment;

[0034] Figure 2 for Figure 1 The middle base is a schematic diagram of the structure in a cutaway state;

[0035] Figure 3 for Figure 1 Left view of;

[0036] Figure 4 Schematic diagram of the internal structure of the electrical box in the embodiment;

[0037] Figure 5 Schematic diagram of the zeroing process of the test starting point displacement in the embodiment;

[0038] Figure 6 Schematic diagram of the contact signal wire port and its wires in the embodiment.

[0039] In the figure, 1. Base 2. Bottom plate 3. Top plate 4. Rear plate 5. Motor 6. Pulley 7. Screw 701. First deep groove ball bearing 702. Thrust ball bearing 703. Second deep groove ball bearing 704. Third deep groove ball bearing 8. Screw mounting base 801. First support block 802. Second support block 803. Third support block 9. Slider 10. Moving plate 11. Pressure sensor 12. Detection head of long grating displacement sensor 13. Displacement detection guide rail of long grating displacement sensor 14. Display 15. Zero adjustment indicator light 1501. Zero adjustment wire 16. Contact indicator light 17. Operation button 18. Contact signal wire port 1801. Contact wire 1802. Conductive clip 19. Drag chain drive track 20. Drag chain 21. Metal indenter 22. Travel switch test socket 23. Travel switch 2301. Test button 2302. Contact connector 24. Housing 25. PLC controller 26. AD sensor conversion module 27. Power supply 28. Motor driver 201. Signal line. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments, but the present invention is not limited thereto. Example

[0041] Reference Figure 1-Figure 3 , a travel switch parameter testing device, comprising a base 1 with an upper opening, a bottom plate 2 for covering the base 1 is provided at the opening of the base 1, a motor 5 with a pulley 6 is provided on the bottom surface of the bottom plate 2, the motor 5 is placed in the inner cavity of the base 1, a rear plate 4 is provided on one side of the bottom plate 2 and is perpendicular to the bottom plate 2, a top plate 3 is provided on the top of the back plate 4 and is in the same direction as the bottom plate 2, a screw mounting seat 8 is provided between the top plate 3 and the bottom plate 2, the screw mounting seat 8 comprises a first support block 801 vertically close to the inner side of the back plate 4, a second support block 802 and a third support block 803 are respectively provided at both ends of the first support block 801, which are perpendicular to the first support block 801 and are respectively abutted against the bottom plate 2 and the top plate 3, the second support block 802 and the third support block 803 are both in the same direction as the top plate 3, a screw rod 7 is provided between the second support block 802 and the third support block 803, the screw rod 7 passes through the second support block 802 and is connected to the pulley 6 of the motor 5, the third support block 803 A slider 9, a detection head 12 of a long grating displacement sensor and a stepped movable plate 10 are sequentially arranged on the lead screw 7 toward the second support block 802. The lead screw 7 passes through the slider 9, the detection head 12 of the long grating displacement sensor and the movable plate 10. A detection guide rail 13 of a long grating displacement sensor facing the same direction as the second support block 802 is provided on the first support block 801, wherein the detection head 12 of the long grating displacement sensor and the detection guide rail 13 of the long grating displacement sensor form a long grating displacement sensor. A pressure sensor 11 and a metal pressure head 21 are sequentially arranged on the stepped bottom surface of the movable plate 10 facing the bottom plate 2. A travel switch test seat 22 is provided on the bottom plate 2 just below the metal pressure head 21. The axis of the metal pressure head 21 is in the same straight line as the axis of the travel switch test seat 22. A drag chain transmission track 19 and a drag chain 20 arranged on the drag chain transmission track 19 are provided on the inner side of the rear plate 4. An electrical box is also provided on the bottom plate 2.

[0042] like Figure 4As shown, the electrical box includes a shell 24, and a PLC controller 25 connected to a power supply, an AD sensor conversion module 26 and a motor driver 28 are provided in the shell 24. A display screen 14, a zero adjustment indicator light 15, a contact signal line wire port 18, a contact indicator light 16 and an operation button 17 are provided on the shell 24, wherein the contact signal line wire port 18 is located at an interface on the outside of the shell and is externally connected to multiple groups of contact wires 1801 and a group of zero adjustment wires 1501. A group of contact wires 1801 and a zero adjustment wire 1501 respectively include two contact wires 1801 and a zero adjustment wire 1501. The outer end of each contact wire 1801 is connected to a conductive clip 1802. A group of contact wires 1801 and a zero adjustment wire The wires 1501 correspond to the contact signal line wire ports 18 located on the interface inside the shell 24 and are connected to a contact indicator light 16 and a zero adjustment indicator light 15 through wires, that is, two contact wires 1801 are connected to a contact indicator light 16, and two zero adjustment wires 1501 are connected to a zero adjustment indicator light 15, thereby forming a loop. The motor driver 28 is connected to the motor 5 through wires, the AD sensor conversion module 26 is connected to the pressure sensor 11 and the PLC controller 25 through signal lines, the PLC controller 25 is connected to the long grating displacement sensor, the display screen 14, the contact indicator light 16, the zero adjustment indicator light 15 and the operation button 17 through signal lines, and the display screen 14 is externally connected to a computer.

[0043] The signal lines of the long grating displacement sensor and the pressure sensor 11 are placed in the drag chain 20. When the equipment is working, the signal lines are not easy to bend or knot during the test, thereby better ensuring the smoothness of the test process and the stability of signal transmission.

[0044] The end of the screw rod 7 passing through the second support block 802 is sequentially provided with a first deep groove ball bearing 701, a thrust ball bearing 702 and a second deep groove ball bearing 703, and the first deep groove ball bearing 701 is close to the pulley 6 of the motor 5; the end of the screw rod 7 passing through the third support block 803 is provided with a third deep groove ball bearing 704.

[0045] The number of the external connection ports of the contact signal line conductor port 18 is the same as the sum of the number of the contact conductors 1801 and the zero adjustment conductors 1501 .

[0046] The lengths of the contact wire 1801 and the zeroing wire 1501 are both greater than the maximum displacement of the long grating displacement sensor, thereby preventing the contact wire 1801 and the zeroing wire 1501 from being pulled by the movement of the detection head 12 of the long grating displacement sensor.

[0047] The operation buttons 17 include emergency stop, rise, fall, stop, manual reset and start test. The operation buttons 17 are used for manual testing.

[0048] The first support block 801 , the second support block 802 and the third support block 803 are integrally formed to form the screw mounting seat 8 .

[0049] The motor 5 is a stepping motor.

[0050] A method for testing a travel switch parameter testing device includes the above-mentioned travel switch parameter testing device, and the method includes the following steps:

[0051] 1) Place the travel switch 23 to be tested on the travel switch test seat 22;

[0052] 2) Connect the two zero adjustment wires 1501 to the metal pressure head 21 and the test button 2301 of the limit switch 23 respectively, and connect the conductive clip 1802 to the contact connector 2302 of the limit switch 23, as shown in the figure. Figure 5 、 Figure 6 As shown;

[0053] 3) Turn on power 27, turn on the computer and display screen 14, and the motor driver 28 controls the motor 5 to work in the forward direction, driving the lead screw 7 to rotate. The detection head 12, slider 9, and movable plate 10 of the long grating displacement sensor on the lead screw 7 rotate along with the lead screw 7, thereby driving the metal indenter 21 to move downward. When the metal indenter 21 contacts the test button 2301 of the travel switch 23, the metal indenter 21 and the travel switch 23 form a loop through the zeroing wire 1501 to perform zeroing of the force and displacement values.

[0054] 4) The metal pressing head 21 continues to move downward following the rotation of the screw rod 7. The downward movement of the metal pressing head 21 generates pressure to test the travel switch 23. At the same time, the pressure sensor 11 starts to calculate the pressure parameters, and the long grating displacement sensor calculates the displacement.

[0055] 5) When the actual test value of the pressure sensor 11 reaches the set movement value of the PLC controller 25, the motor driver 28 controls the motor 5 to work in the reverse direction, and the pressure sensor 11 on the metal pressing head 21 moves up to the initial position along with the screw rod 7, completing the test of the current travel switch.

[0056] Working principle:

[0057] During the test, when the metal pressing head 21 touches the test button 2301 of the travel switch 23, a loop is formed between the two zeroing wires 1501 to light up the zeroing indicator light 15. At this time, the equipment will clear the displacement parameters and then use the long grating displacement sensor to collect the displacement signal; the PLC controller 25 is mainly used to control the up and down movement of the pressure sensor 11 on the metal pressing head 21 and stop the return action, and then the AD sensor conversion module 26 converts the electrical signal parameters obtained by the test into digital signals and displays them on the display screen 14.

Claims

1. A travel switch parameter testing device, characterized in that: The cam is provided with a plurality of guide wheels, and the guide wheels are connected to the top of the cam, and the guide wheels are connected to the top of the cam, and the guide wheels are connected to the bottom of the cam. A slider, a detection head of a long grating displacement sensor and a stepped moving plate are sequentially arranged, and the lead screws all pass through the slider, the detection head of the long grating displacement sensor and the moving plate. A detection guide rail of the long grating displacement sensor facing the same direction as the second support block is provided on the first support block, wherein the detection head of the long grating displacement sensor and the detection guide rail of the long grating displacement sensor constitute a long grating displacement sensor. A pressure sensor and a metal pressure head are sequentially arranged on the stepped bottom surface of the moving plate facing the bottom plate, and a travel switch test seat is arranged on the bottom plate just below the metal pressure head. The axis of the metal pressure head and the axis of the travel switch test seat are in the same straight line. A drag chain transmission track and a drag chain arranged on the drag chain transmission track are provided on the inner wall of the rear plate, and an electrical box is also provided on the bottom plate. The electrical box includes a shell, in which a PLC controller connected to a power supply, an AD sensor conversion module and a motor driver are arranged. The shell is provided with a display screen, a zero adjustment indicator light, a contact signal line wire port, a contact indicator light and an operation button, wherein the contact signal line wire port is located at an interface on the outside of the shell and is externally connected to multiple groups of contact wires and a group of zero adjustment wires. A group of contact wires and a zero adjustment wire respectively include two contact wires and a zero adjustment wire. The outer end of each contact wire is connected to a conductive clip. A group of contact wires and a zero adjustment wire respectively correspond to the contact signal line wire port located at an interface on the inside of the shell and are connected to a contact indicator light and a zero adjustment indicator light through wires, that is, two contact wires are connected to a contact indicator light, and two zero adjustment wires are connected to a zero adjustment indicator light, thereby forming a loop. The motor driver is connected to the motor through wires, the AD sensor conversion module is connected to the pressure sensor and the PLC controller through signal lines, the PLC controller is connected to the long grating displacement sensor, the display screen, the contact indicator light, the zero adjustment indicator light and the operation button through signal lines, and the display screen is externally connected to a computer.

2. The travel switch parameter testing device according to claim 1, characterized in that: The signal lines of the long grating displacement sensor and the pressure sensor are placed in the drag chain.

3. The travel switch parameter testing device according to claim 1, characterized in that: The end of the screw rod passing through the second support block is sequentially provided with a first deep groove ball bearing, a thrust ball bearing and a second deep groove ball bearing, and the first deep groove ball bearing is close to the pulley of the motor; the end of the screw rod passing through the third support block is provided with a third deep groove ball bearing.

4. The travel switch parameter testing device according to claim 1, characterized in that: The number of the contact signal line wire ports located on the outside of the housing is the same as the sum of the number of the contact wires and the zero adjustment wires.

5. The travel switch parameter testing device according to claim 1, characterized in that: The lengths of the contact wire and the zero adjustment wire are both greater than the maximum displacement of the long grating displacement sensor.

6. The travel switch parameter testing device according to claim 1, characterized in that: The operation buttons include emergency stop, rise, fall, stop, manual reset and start test, and the operation buttons are used for manual testing.

7. The travel switch parameter testing device according to claim 1, characterized in that: The first support block, the second support block and the third support block are integrally formed to form a screw mounting seat.

8. A method for testing a travel switch parameter testing device, characterized in that: The device for testing the parameters of a travel switch according to any one of claims 1 to 7, wherein the method comprises the following steps: 1) Place the travel switch to be tested on the travel switch test seat; 2) Connect the two zero adjustment wires to the metal pressure head and the test button of the travel switch respectively, and connect the conductive clip to the contact connector of the travel switch; 3) Turn on the power, computer, and display. The motor driver controls the motor to work in the forward direction, driving the lead screw to rotate. The detection head, slider, and moving plate of the long grating displacement sensor on the lead screw rotate along with the lead screw, thereby driving the metal indenter downward. When the metal indenter contacts the test button of the travel switch, the metal indenter and the travel switch form a loop through the zeroing wire to adjust the force and displacement values ​​to zero. 4) The metal indenter continues to move downward as the screw rotates. The downward movement of the metal indenter generates pressure to test the travel switch. At the same time, the pressure sensor starts to calculate the pressure parameters, and the long grating displacement sensor calculates the displacement. 5) When the actual test value of the pressure sensor reaches the set value of the PLC controller, the motor driver controls the motor to work in reverse, and the pressure sensor on the metal pressure head moves up to the initial position along with the screw rod, completing the test of the current travel switch.

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