A method for testing a cam switch

Abstract

The application discloses a kind of inspection methods for cam switch, carry out cam switch deceleration ratio monitoring in turn, carry out the comparison of datum angle data and the cam piece angle parameter set, and carry out the comparison of cam piece test angle curve and the angle difference parameter set, to complete the detection of cam product.The present application can realize the high-precision detection of cam switch.

Description

Technical Field

[0001] This invention relates to an inspection method for cam switches used in the field of cam switch manufacturing. Background Technology

[0002] A cam switch is a commonly used mechanical limit switch, mainly composed of a shaft, gears, cam plates, and contacts. It's a control switch that uses a cam mechanism to control the open or closed contact of a circuit. It's typically used when the switching device cannot directly limit the displacement of a specific component, but only controls the component's travel by measuring its rotation angle. It's widely used in lifting and transportation equipment, elevators, stage equipment, and other fields, especially in high-altitude areas where workers may be in danger, such as in situations requiring deceleration or buffering of cranes or lifting equipment. This switch triggers a microswitch through cam rotation, using a weak electrical signal to control high-voltage electrical equipment, achieving the purpose of positioning or stopping the equipment.

[0003] In recent years, with the increasing market demand from industries such as logistics and transportation, port loading and unloading, and building electrical systems, as well as the development of automated equipment and various automated production lines in industries such as steel, metallurgy, machinery, light industry, and mining, the supply and requirements for cam limit switches have become increasingly stringent. How to perform higher-precision detection of the dimensions of cam switches to ensure production stability and reliability is a primary objective for technical personnel. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a testing method for cam switches that can achieve high-precision testing of cam switches.

[0005] One technical solution to achieve the above objective is: a test method for cam switches, comprising the following steps,

[0006] Step 1: Set the cam switch into the cam switch testing equipment;

[0007] Step 2: Manually point the probe of the cam switch testing device to the NO contact of the cam switch;

[0008] Step 3: The servo rotates a maximum of 200 revolutions. The product reduction ratio is obtained through the NO contact signal of the cam and sent to the industrial control computer. The reduction ratio data is compared with the set reduction ratio parameter to confirm whether the product is correct. If the product is correct, the process continues. Otherwise, the process ends directly and the defective product count is incremented by 1.

[0009] Step 4: Clear the current position of the servo;

[0010] Step 5: The servo starts rotating one revolution to find the reference starting angle of the NO and NC contacts of the 8 sets of cams;

[0011] Step 6: Send the reference angle data to the industrial computer. The industrial computer uses this data to determine the angles of the 8 cam plates, generates a cam plate reference angle curve, and compares it with the set cam plate angle parameters. If they match, continue to the next step; otherwise, the process ends directly, and the defective product count is incremented by 1.

[0012] Step 7: Clear the current position of the servo;

[0013] Step 8: The servo starts to rotate one revolution to find the test starting angle of the NO and NC contacts of the 8 sets of cams;

[0014] Step 9: Send the test angle data to the industrial control computer. The industrial control computer obtains the difference between the NO and NC contact angles of the 8 cam plates and the previous rotation angle, and generates the cam plate test angle curve. It then compares the curve with the set angle difference parameter. If the comparison is consistent, the process continues. Otherwise, the process ends directly, and the defective product count is incremented by 1.

[0015] Step 10: Complete the specified number of action cycles according to the set number of tests;

[0016] Step 11: After the product inspection is completed, the industrial control computer saves the product data and then the product needs to be removed. If the product is unqualified, the "NG Confirmation" button of the cam switch inspection equipment needs to be pressed and then the product needs to be removed. If the product is qualified, it can be removed directly after the inspection is completed.

[0017] Furthermore, the cam switch inspection equipment sets product part numbers for the specifications and types of cam switch products. Each part number defines its standard specification and size data range. The product part number is input before the cam switch is set on the cam switch inspection equipment.

[0018] Furthermore, the product part number can be entered manually or by scanning the work order number barcode.

[0019] Furthermore, set the cam switch before the cam switch testing equipment, check whether the equipment's emergency stop is released, and check whether the safety door is closed. After ensuring that the emergency stop is released and the safety door is closed, power on the equipment and check whether the equipment is powered on normally.

[0020] This invention provides a testing method for cam switches that simulates the usage scenarios of cam switches, enabling testing of cam switches under conditions closer to actual use. The method offers two modes, adaptable to both routine production scenarios and experimental scenarios conducted by R&D engineers. Furthermore, this invention achieves digital automated testing, improving testing efficiency. After testing the cam switches, the data is stored in a database, allowing for easy access to internal experimental data and providing guidance for design and production. Detailed Implementation

[0021] To better understand the technical solution of the present invention, detailed descriptions are provided below through specific embodiments:

[0022] The present invention provides a method for inspecting cam switches, which is implemented using a cam switch inspection device. The specific operation steps are as follows.

[0023] I. Preparatory work before operation

[0024] 1. The equipment is powered by 220VAC and 1KW.

[0025] 2. The equipment does not require a gas supply.

[0026] 3. Ensure all network connections are normal, including: switch to PLC, switch to IPC, PLC to HMI (RS232 serial communication), and barcode scanner to IPC.

[0027] II. Operating Procedures

[0028] 1. Powering on the device: Turn on the rotary power switch next to the device to power it on. The IPC will start automatically, and the host software will start automatically after entering the system. The HMI will light up normally.

[0029] 2. Powering on the equipment: Check if the emergency stop is released and if the safety door is closed. With the emergency stop released and the safety door closed, press the first green button on the HMI panel to power on the equipment. A normal power-on will illuminate the green indicator light on the button. If the light does not illuminate, check the HMI alarm messages.

[0030] 3. Switch the device to manual mode, click the initialization button on the HMI main screen, and the servo will start searching for the origin. Once the origin search is complete, it is ready to run automatically.

[0031] 4. Before the equipment automatically starts testing, you first need to select the product part number (material number). Part number information is maintained in the IPC software, which allows you to add, delete, and modify product part numbers. You can select a part number manually from the part number selection list box, manually enter the part number name, or automatically select it by scanning the material barcode. Depending on the parameter configuration, if the barcode scanning function is "on," you also need to scan the work order number barcode; if it's "off," you don't need to scan the work order number barcode.

[0032] 5. Entering the automatic process: Place the product in the designated position on the equipment and push it in. Once in place, a tooling positioning sensor will detect it. If the product is detected correctly, an electromagnet will hold it in place. Indicator lights will appear on the HMI screen. Manually press down the probe mechanism; a probe positioning sensor will detect if the probe is in place. Indicator lights will appear on the HMI screen. Leave the light curtain area and press the dual start button; the equipment will then begin automatic operation. The automatic monitoring and operation steps are as follows:

[0033] 5.1 Initialization of detection status: Signals exchanged between the device and the IPC.

[0034] 5.2 Obtaining the product's reduction ratio: The servo rotates a maximum of 200 revolutions. The product's reduction ratio is obtained through the NO contact signal of cam #1 and sent to the IPC for comparison with the set reduction ratio parameter to confirm the product's correctness. If the product is correct, the process continues; otherwise, the process ends directly, and the defective product count is incremented by 1.

[0035] 5.3, Reset the current position of the servo to zero.

[0036] 5.4 The servo begins to rotate one revolution to find the reference starting angle of the NO and NC contacts of the 8 cams.

[0037] 5.5. Send the reference angle data to the IPC. The IPC uses this data to determine the angles of the 8 cam plates, generates a cam plate reference angle curve, and compares it with the set cam plate angle parameters. If they match, continue execution; otherwise, the process ends directly, and the defective product count is incremented by 1.

[0038] 5.6, Reset the current position of the servo to zero.

[0039] 5.7 The servo begins to rotate one revolution to find the test starting angle of the NO and NC contacts of the 8 sets of cams.

[0040] 5.8. Send the test angle data to the IPC. The IPC then obtains the difference between the NO and NC contact angles of the 8 cam plates and the previous rotation angle, generates the cam plate test angle curve, and compares it with the set angle difference parameter. If they match, continue execution; otherwise, the process ends directly, and the defective product count is incremented by 1.

[0041] 5.9 Determine the number of cycles for the action based on the set number of detections.

[0042] 5.10. Product testing is complete. The IPC saves the product data, and then the product needs to be removed. If the product is NG (not working), press the "NG Confirmation" button on the left side of the equipment control panel, and then remove the product. If the product is OK, it can be removed directly.

[0043] 5.11. All defects observed during testing will be displayed with corresponding prompts and status indicator lights on the HMI. The IPC will also provide data tables that use different colors to distinguish between OK and NG.

[0044] 6. On the main HMI screen, clicking "Confirm Work Order Completion" will clear the current part number and work order number information for the IPC. Note: This operation must be performed when the equipment is not running.

[0045] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A method for inspecting cam switches, characterized in that, Includes the following steps, Step 1: Set the cam switch into the cam switch testing equipment; Step 2: Manually press the probe of the cam switch testing equipment against the NO contact of the cam switch; Step 3: The servo rotates a maximum of 200 revolutions. The product reduction ratio is obtained through the NO contact signal of the cam and sent to the industrial control computer. The reduction ratio data is compared with the set reduction ratio parameter to confirm whether the product is correct. If the product is correct, the process continues. Otherwise, the process ends directly and the defective product count is incremented by 1. Step 4: Clear the current position of the servo; Step 5: The servo starts rotating one revolution to find the reference starting angle of the NO and NC contacts of the 8 sets of cams; Step 6: Send the reference angle data to the industrial computer. The industrial computer uses this data to determine the angles of the 8 cam plates, generates a cam plate reference angle curve, and compares it with the set cam plate angle parameters. If they match, continue to the next step; otherwise, the process ends directly, and the defective product count is incremented by 1. Step 7: Clear the current position of the servo; Step 8: The servo starts to rotate one revolution to find the test starting angle of the NO and NC contacts of the 8 sets of cams; Step 9: Send the test angle data to the industrial control computer. The industrial control computer obtains the difference between the NO and NC contact angles of the 8 cam plates and the previous rotation angle, and generates the cam plate test angle curve. It then compares the curve with the set angle difference parameter. If the comparison is consistent, the process continues. Otherwise, the process ends directly, and the defective product count is incremented by 1. Step 10: Complete the specified number of action cycles according to the set number of tests; Step 11: After the product inspection is completed, the industrial control computer saves the product data and then the product needs to be removed. If the product is unqualified, the "NG Confirmation" button of the cam switch inspection equipment needs to be pressed and then the product needs to be removed. If the product is qualified, it can be removed directly after the inspection is completed.

2. The inspection method for a cam switch according to claim 1, characterized in that, The cam switch inspection equipment sets product part numbers for the specifications and types of cam switch products. Each part number defines its standard specification and size data range. The product part number is input before setting the cam switch to the cam switch inspection equipment.

3. The inspection method for a cam switch according to claim 2, characterized in that, The product part number can be entered manually or by scanning the work order number barcode.

4. The inspection method for a cam switch according to claim 1, characterized in that, Set the cam switch in front of the cam switch testing equipment, check whether the emergency stop of the equipment is released, and check whether the safety door is closed. After ensuring that the emergency stop is released and the safety door is closed, power on the equipment and check whether the equipment is powered on normally.