Linear potentiometer measuring device

Abstract

The utility model relates to the technical field of linear potentiometers, and discloses a linear potentiometer measuring device which comprises a testing device table body, a signal conditioning box is arranged at the top of the testing device table body, an industrial personal computer is arranged on the side face of the testing device table body, a multifunctional card is arranged in the industrial personal computer, and the multifunctional card is connected with the signal conditioning box. A display screen is arranged at the top of the testing device table body, a programmable power supply is arranged on the side surface of the testing device table body, and a clamping device is arranged at the top of the testing device table body; the clamping device comprises a mounting plate. Before testing is started, measurement and control software controls the side face pressing air cylinder and the top face pressing air cylinder to position and clamp the linear potentiometers in the linear potential clamping grooves through the signal conditioning box, and after testing is completed, the measuring device controls the side face pressing air cylinder and the top face pressing air cylinder to be released. And then an operator can take out the linear potentiometer in the linear potential clamping groove.

Description

Technical Field

[0001] This utility model relates to the field of linear potentiometer technology, specifically to a linear potentiometer measuring device. Background Technology

[0002] In the field of finished product inspection on linear potentiometer production lines, quality inspection of finished products is usually required, including the effective stroke length, total resistance, linearity, smoothness, and noise of linear potentiometers. Existing automatic potentiometer testing devices are mostly for testing circular rotary potentiometers, while automatic testing devices for linear potentiometers are relatively scarce. Currently, most newly developed linear potentiometer products rely on manual measurement by operators, which takes a long time and results in inconsistent values. Therefore, we have designed a new device that can automatically measure various parameters of the output characteristics of linear potentiometers, reducing the single measurement time to less than 30 seconds and providing good consistency of test results. This facilitates batch inspection and testing of linear potentiometer products and improves production line efficiency.

[0003] Existing technology, such as patent publication number CN208737961U, discloses a linear potentiometer for measurement, including a potentiometer body and replaceable contacts. The potentiometer body is a conductive plastic potentiometer, which also includes a slide rod, an outer cylinder, a conductive plastic substrate, a plastic film, and a brush. The conductive plastic substrate is fixed on the plastic film, and the plastic film covers the inner wall of the outer cylinder. The brush is fixed to the tail end of the slide rod, and the brush is slidably connected to the conductive plastic substrate. A return spring is sleeved on the outer wall of the slide rod, with one end of the return spring tightly attached to the connecting seat and the other end tightly attached to the replaceable contacts. This utility model discloses a linear potentiometer for measurement, which has a simple and reasonable structure, facilitates the replacement of various types of contacts, has low cost, provides accurate measurement, and has a long service life.

[0004] While the aforementioned existing technologies have significant beneficial effects, they still have shortcomings:

[0005] The existing technology described above involves replacing the potentiometer body and contacts. The potentiometer body is a conductive plastic potentiometer assembly. When testing a linear potentiometer, the linear potentiometer can only be manually positioned. Therefore, a linear potentiometer measuring device is proposed. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a linear potentiometer measuring device. The linear potentiometer is placed into the linear potentiometer slot within a clamping device. Before testing, the control software uses a signal conditioning box to control the side and top clamping cylinders to position and clamp the linear potentiometer in the slot. After testing, the measuring device releases the side and top clamping cylinders, allowing the operator to remove the linear potentiometer from the slot.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a linear potentiometer measuring device, comprising a test device platform, a signal conditioning box disposed on the top of the test device platform, an industrial control computer disposed on the side of the test device platform, a multi-function card disposed inside the industrial control computer, a display screen disposed on the top of the test device platform, a programmable power supply disposed on the side of the test device platform, and a clamping device disposed on the top of the test device platform;

[0008] The clamping device includes a mounting plate, the bottom of which is fixedly connected to the top of the test device platform. A side-clamping cylinder is fixedly connected to the top of the mounting plate. A fixing plate is fixedly connected to the top of the test device platform. A linear potentiometer slot is provided on the top of the fixing plate. A linear potentiometer is installed inside the linear potentiometer slot. The signal conditioning box serves as a conversion module for the electrical signal connection between the product under test and the test device. It is mainly responsible for controlling the loading and cutting off of the power supply, selecting and changing the measurement mode, conditioning and adapting the signal of the linear potentiometer under test, and controlling the clamping and releasing of the clamping fixture. The clamping fixture is used for clamping and fixing the linear potentiometer before testing and releasing it after testing. The industrial control computer serves as the measurement and control host, used to install the multi-function card hardware and install and run the linear potentiometer measurement and control software. It controls the operation of the measuring device according to the operator's instructions. The display screen is used for the human-machine interface display of the measuring device system software.

[0009] Preferably, the top of the test device platform is provided with a support rod, and the bottom of the support rod is fixedly connected to a top surface clamping cylinder, which has the function of measuring the total resistance of the potentiometer slider push-pull mechanism, with a measurement range covering 200Ω~30KΩ and a resistance accuracy of 1‰, and has the function of measuring the effective stroke of the potentiometer slider push-pull mechanism, with a stroke measurement range covering 5mm~350mm and a stroke accuracy of 5um.

[0010] Preferably, the linear potentiometer adopts a quick installation and disassembly method using a slot sliding in and out and a cylinder clamping and releasing mechanism, and has functions for testing the linearity of the potentiometer slider push-pull mechanism, output smoothness, and noise.

[0011] Preferably, the programmable power supply is configured as a high-precision power supply and can switch between voltage output mode and current output mode. When the output accuracy in either voltage or current mode is better than one percent, it can provide a highly stable power supply for linear potentiometer testing.

[0012] Preferably, a linear transmission device is provided on the top of the test device platform. The linear transmission device includes a lead screw motor. The bottom of the lead screw motor is fixedly connected to the inside of the signal conditioning box. The output shaft of the lead screw motor is provided with a transmission mechanism. A connecting plate is fixedly connected to the top of the transmission mechanism. A connecting rod is fixedly connected to the front side of the connecting plate. The back side of the support rod is fixedly connected to the front side of the connecting rod. A grating ruler slider push-pull mechanism is provided at the bottom of the connecting rod. The lead screw motor and the grating ruler slider push-pull mechanism are used to control the displacement and positioning feedback of the potentiometer slider push-pull mechanism.

[0013] Preferably, the bottom of the grating ruler sliding head push-pull mechanism is fixedly connected to the top of the test device platform, the top of the test device platform is fixedly connected to the grating ruler, and the bottom of the top surface pressing cylinder is provided with a potentiometer sliding head push-pull mechanism. The grating ruler is used to control the displacement and positioning feedback of the potentiometer sliding head push-pull mechanism.

[0014] Preferably, the potentiometer slider push-pull mechanism and the grating ruler slider push-pull mechanism and grating ruler are integrated and installed in parallel. The multi-function card is connected to the lead screw motor of the linear transmission module through the driver to control the motor to run in the positive direction, and is connected to the grating ruler of the linear transmission module to read the real-time position feedback of the linear transmission module; and the output signal of the potentiometer slider push-pull mechanism is collected.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This utility model uses a clamping device to place the linear potentiometer product into the linear potentiometer slot in the clamping device. Before the test begins, the measurement and control software controls the side clamping cylinder and the top clamping cylinder through the signal conditioning box to position and clamp the linear potentiometer in the linear potentiometer slot. After the test is completed, the measuring device controls the side clamping cylinder and the top clamping cylinder to release, and then the operator can take out the linear potentiometer from the linear potentiometer slot.

[0017] 2. This utility model uses a collection device and a lead screw motor to rotate in both directions according to the control signal output of the multi-functional card motor. This drives the potentiometer slider mechanism to perform linear reciprocating motion. One end of the potentiometer slider mechanism is connected to the sliding contact of the linear potentiometer of the product under test, and the other end is connected to the grating ruler. When the lead screw motor drives the slider arm of the linear potentiometer to reciprocate, the reading head of the grating ruler moves accordingly. The testing device can determine the real-time position feedback based on the grating ruler.

[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures pointed out in the description, claims, and drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0020] Figure 2 This is a schematic diagram of the clamping device structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the linear transmission device of this utility model;

[0022] Figure 4 This utility model Figure 2 A three-dimensional magnified structural diagram at point A in the middle;

[0023] Figure 5 This is the circuit diagram for the linear potentiometer measurement of this utility model.

[0024] In the diagram: 1. Test device platform; 2. Signal conditioning box; 3. Industrial computer; 4. Multifunction card; 5. Display screen; 6. Programmable power supply; 7. Clamping device; 71. Mounting plate; 72. Side clamping cylinder; 73. Fixing plate; 74. Linear potentiometer slot; 75. Linear potentiometer; 76. Support rod; 77. Top clamping cylinder; 8. Linear transmission device; 81. Lead screw motor; 82. Transmission mechanism; 83. Connecting plate; 84. Connecting rod; 85. Grating ruler slider push-pull mechanism; 86. Grating ruler; 87. Potentiometer slider push-pull mechanism. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1 - Figure 5This embodiment of a linear potentiometer measuring device includes a test platform 1, a signal conditioning box 2 on the top of the test platform 1, an industrial control computer 3 on the side of the test platform 1, a multi-function card 4 inside the industrial control computer 3, a display screen 5 on the top of the test platform 1, a programmable power supply 6 on the side of the test platform 1, and a clamping device 7 on the top of the test platform 1. The clamping device 7 includes a mounting plate 71, the bottom of which is fixedly connected to the top of the test platform 1, and a side clamping cylinder 72 fixedly connected to the top of the mounting plate 71. A fixing plate 73 is fixedly connected to the top of the platform 1. A linear potentiometer slot 74 is provided on the top of the fixing plate 73. A linear potentiometer 75 is installed inside the linear potentiometer slot 74. The signal conditioning box 2 serves as a conversion module for the electrical signal connection between the product under test and the testing device. It is mainly responsible for controlling the loading and unloading of the power supply, selecting and changing the measurement mode, conditioning and adapting the signal of the linear potentiometer 75 under test, and controlling the clamping and releasing of the clamping fixture. The clamping device 7 is used for clamping and fixing the linear potentiometer 75 before testing and releasing it after testing. The industrial control computer 3 serves as the measurement and control host, used to install the multi-function card 4 hardware, and... The linear potentiometer 75 measurement and control software is installed and run to control the operation of the measuring device according to the operator's instructions. The display screen 5 is used for the human-machine interface display of the measuring device system software. The top of the test device platform 1 is equipped with a support rod 76, and the bottom of the support rod 76 is fixedly connected to a top surface clamping cylinder 77. It has the function of measuring the total resistance of the potentiometer slider push-pull mechanism 87, with a measurement range covering 200Ω~30KΩ and a resistance accuracy of 1‰. It also has the function of measuring the effective stroke of the potentiometer slider push-pull mechanism 87, with a stroke measurement range covering 5mm~350mm and a stroke accuracy of 5um. The linear potentiometer 75 adopts a slot. The device features a quick installation and disassembly method using sliding in, sliding out, and cylinder clamping and releasing mechanisms. It also includes functions for testing the linearity, output smoothness, and noise of the potentiometer slider push-pull mechanism 87. The programmable power supply 6 is configured as a high-precision power supply and can switch between voltage and current output modes. When the output accuracy in either voltage or current mode is better than one percent, it can provide a highly stable power supply for testing the linear potentiometer 75. The signal conditioning box 2 is a self-developed device, mainly composed of a power module, a power loading relay, a mode switching relay, a drive module, a main control MCU, an RS232 communication module, and a multi-function card 4 signal conversion module.The power supply module outputs 24V, 5V, and 3.3V voltages. The 24V power supply powers the relays and drive modules, while the 5V and 3.3V power supplies the digital circuits. The power loading relay controls the loading and unloading of the power supply to the linear potentiometer 75 of the product under test. The mode switching relay consists of multiple sets of relays, allowing selection of different connection modes based on the measurement content. The drive module is a Darlington output array used to control the on / off state of the solenoid valve of the clamping device 7 cylinder. The main control MCU executes control commands issued by the industrial control computer 3 measurement and control software, such as power on / off, mode switching, and cylinder action. The RS232 communication module is used for level signal conversion between the UART interface of the main control MCU and the RS232 interface of the industrial control computer 3. The multi-function card 4 signal conversion module is used for the connection between the motor pulse output control interface and the lead screw motor 81 driver, and the connection between the counting interface and the grating ruler 86.

[0027] like Figure 1 - Figure 2 As shown, the potentiometer in this utility model is similar to existing potentiometers, such as the linear potentiometer for measurement disclosed in CN208737961U. The main improvement of this utility model is that, firstly, when it is necessary to use this device to measure the linear potentiometer 75, the clamping device 7 can be used to position the linear potentiometer 75. The operator places the linear potentiometer 75 into the linear potentiometer slot 74 in the clamping device 7. Before the test begins, the measurement and control software controls the side clamping cylinder 72 and the top clamping cylinder 77 through the signal conditioning box 2 to position and clamp the linear potentiometer 75 in the linear potentiometer slot 74. After the test is completed, the measuring device controls the side clamping cylinder 72 and the top clamping cylinder 77 to release, and then the operator can take out the linear potentiometer 75 from the linear potentiometer slot 74.

[0028] like Figure 3As shown, a linear transmission device 8 is installed on the top of the test device platform 1. The linear transmission device 8 includes a lead screw motor 81. The bottom of the lead screw motor 81 is fixedly connected to the inside of the signal conditioning box 2. A transmission mechanism 82 is installed on the output shaft of the lead screw motor 81. A connecting plate 83 is fixedly connected to the top of the transmission mechanism 82. A connecting rod 84 is fixedly connected to the front side of the connecting plate 83. A support rod 76 is fixedly connected to the front side of the connecting rod 84. A grating ruler slider push-pull mechanism 85 is installed at the bottom of the connecting rod 84. The lead screw motor 81 and the grating ruler slider push-pull mechanism 85 are used to control the displacement and positioning feedback of the potentiometer slider push-pull mechanism 87. The bottom of the grating ruler slider push-pull mechanism 85 is fixedly connected to the top of the test device platform 1. A grating ruler 86 is fixedly connected to the top of the test device platform 1. A potentiometer slider push-pull mechanism is installed at the bottom of the top surface pressing cylinder 77. Mechanism 87 and grating ruler 86 are used to control the displacement and positioning feedback of potentiometer slider push-pull mechanism 87. Potentiometer slider push-pull mechanism 87, grating ruler slider push-pull mechanism 85, and grating ruler 86 are integrated and installed in parallel. Multifunction card 4 is connected to the lead screw motor 81 of linear transmission module through driver to control the motor's positive direction operation. It is also connected to grating ruler 86 of linear transmission module to read the real-time position feedback of linear transmission module and to collect the output signal of potentiometer slider push-pull mechanism 87. Multifunction card 4 is model USB-6451 and has a motor control IO interface, a counter input interface, and a 20-bit resolution data acquisition interface. The motor control IO interface is connected to the motor driver of linear transmission module; the counter input interface is connected to the grating ruler 86 for position feedback; and the data acquisition interface is connected to the linear potentiometer 75 signal output from signal conditioning box 2.

[0029] like Figures 3-4 As shown, the lead screw motor 81 operates in both forward and reverse directions according to the motor control signal output of the control multifunction card 4, driving the potentiometer slider push-pull mechanism 87 to perform linear reciprocating motion. One end of the potentiometer slider push-pull mechanism 87 is connected to the sliding contact of the linear potentiometer 75 of the product under test, and the other end is connected to the grating ruler 86. When the lead screw motor 81 drives the slider arm of the linear potentiometer 75 to reciprocate, the reading head of the grating ruler 86 moves accordingly, and the testing device can determine the real-time position feedback based on the grating ruler 86.

[0030] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A linear potentiometer measuring device comprising a test device table body (1), characterized in that, The test device platform (1) is provided with a signal conditioning box (2) on the top, an industrial control computer (3) is provided on the side of the test device platform (1), a multi-function card (4) is provided inside the industrial control computer (3), a display screen (5) is provided on the top of the test device platform (1), a programmable power supply (6) is provided on the side of the test device platform (1), and a clamping device (7) is provided on the top of the test device platform (1). The clamping device (7) includes a mounting plate (71), the bottom of which is fixedly connected to the top of the test device platform (1). A side clamping cylinder (72) is fixedly connected to the top of the mounting plate (71). A fixing plate (73) is fixedly connected to the top of the test device platform (1). A linear potential slot (74) is provided on the top of the fixing plate (73). A linear potentiometer (75) is provided inside the linear potential slot (74).

2. A linear potentiometer measuring device according to claim 1, characterized in that The top of the test device platform (1) is provided with a support rod (76), and the bottom of the support rod (76) is fixedly connected with a top surface pressing cylinder (77).

3. A linear potentiometer measuring device according to claim 1, wherein The linear potentiometer (75) is installed and disassembled quickly using a slot-sliding-in and slot-sliding-out method and a cylinder-clamping and releasing method.

4. The linear potentiometer measuring device according to claim 1, wherein The programmable power supply (6) is set as a high-precision power supply and can switch between voltage output mode and current output mode. When the output accuracy in voltage or current mode is better than one percent, it can provide a highly stable power supply for testing linear potentiometers (75).

5. A linear potentiometer measuring device according to claim 2, wherein The test device platform (1) is provided with a linear transmission device (8) on its top. The linear transmission device (8) includes a lead screw motor (81). The bottom of the lead screw motor (81) is fixedly connected to the inside of the signal conditioning box (2). The output shaft of the lead screw motor (81) is provided with a transmission mechanism (82). The top of the transmission mechanism (82) is fixedly connected with a connecting plate (83). The front side of the connecting plate (83) is fixedly connected with a connecting rod (84). The back side of the support rod (76) is fixedly connected to the front side of the connecting rod (84). The bottom of the connecting rod (84) is provided with a grating ruler slider push-pull mechanism (85).

6. A linear potentiometer measuring device according to claim 5, wherein The bottom of the grating ruler sliding push-pull mechanism (85) is fixedly connected to the top of the test device platform (1), the top of the test device platform (1) is fixedly connected to the grating ruler (86), and the bottom of the top surface pressing cylinder (77) is provided with a potentiometer sliding push-pull mechanism (87).

7. A linear potentiometer measuring device according to claim 6, characterised in that, The potentiometer slider push-pull mechanism (87), the grating ruler slider push-pull mechanism (85), and the grating ruler (86) are integrated and installed in parallel.

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