A conductive plastic resistor life test device for angular displacement potentiometer

Abstract

The present invention discloses a conductive plastic resistor life test device for an angular displacement potentiometer, comprising a base, a driving motor, a driving spindle, a rotation counting device and a plurality of driving terminal components, wherein the driving terminal components comprise a gear plate, a transmission shaft, a brush driving shaft, a brush and a resistor mounting seat, wherein the transmission shaft passes through the central through hole of the gear plate and is connected to each other, the transmission shaft is connected to the first end of the brush driving shaft, the second end of the brush driving shaft passes through the central through hole of the resistor mounting seat, the brush is mounted on the second end of the brush driving shaft, the driving motor is mounted on the base, the rotating shaft of the driving motor is connected to the driving spindle, the driving spindle is provided with a spindle gear, and the spindle gear is respectively meshed and connected with a plurality of gear plates. The present invention can complete the life test of a plurality of conductive plastic resistors at one time, is simple and quick, improves the test accuracy and efficiency, and the entire test device can be reused, reducing the test cost.

Description

Technical Field

[0001] The invention relates to a testing device for an angular displacement potentiometer (or sensor), in particular to a testing device for the life of a conductive plastic resistor for an angular displacement potentiometer, and belongs to the field of angular displacement potentiometer production. Background Art

[0002] The angular displacement potentiometer (or sensor) based on conductive plastic resistor and brush is the most commonly used angular displacement potentiometer. Its service life mainly depends on the service life of the conductive plastic resistor. In order to meet most application requirements, the service life of the conductive plastic resistor should not be less than 1 million cycles. Based on the above requirements, before the potentiometer leaves the factory, or even before the potentiometer is mass-produced, it is necessary to conduct a life test on the conductive plastic resistor to avoid unqualified products from entering the market as much as possible.

[0003] The traditional method of conducting a life test on a conductive plastic resistor is to assemble the conductive plastic resistor and other components into a complete angular displacement potentiometer, and then use the potentiometer to conduct a life test to determine whether the life of the resistor meets the requirements.

[0004] The above-mentioned traditional method for life test of conductive plastic resistor has the following serious defects:

[0005] The life of the conductive plastic resistor obtained from the test is closely related to the other structures of the assembled potentiometer. That is to say, the service life of the test result is largely not the actual service life of the conductive plastic resistor itself, resulting in low test accuracy. At the same time, a lot of time is required to assemble the potentiometer before the test, which requires a large number of parts, time and materials, resulting in low test efficiency and high cost. Summary of the invention

[0006] The purpose of the present invention is to provide a conductive plastic resistor life test device for an angular displacement potentiometer with high accuracy and efficiency and low cost in order to solve the above problems.

[0007] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0008] A conductive plastic resistor life test device for an angular displacement potentiometer comprises a base, a drive motor, a drive spindle, a rotation counting device and a plurality of drive terminal assemblies, wherein the drive terminal assemblies comprise a gear plate, a transmission shaft, a brush drive shaft, a brush and a resistor mounting seat, wherein in each of the drive terminal assemblies, the transmission shaft passes through the central through hole of the gear plate and is connected to each other, the first end of the transmission shaft is connected to the first end of the brush drive shaft, the second end of the brush drive shaft passes through the central through hole of the resistor mounting seat and can rotate freely, the brush is mounted on the second end of the brush drive shaft, and a mounting groove for mounting a conductive plastic resistor is provided on a side surface of the resistor mounting seat close to the brush; the drive motor is mounted on the base, the rotating shaft of the drive motor is connected to one end of the drive spindle, the drive spindle is provided with a spindle gear, and the spindle gear is respectively meshed and connected with the gear plates of the plurality of drive terminal assemblies, and the rotation counting device is used to detect the number of rotations of the gear plate or the transmission shaft.

[0009] Preferably, in order to facilitate gear transmission and place the gear transmission structure in a closed space to improve safety and facilitate the installation of gear transmission components, the conductive plastic resistor life test device for angular displacement potentiometer also includes a coupling, a gearbox body and a gearbox cover, the gearbox cover is connected to the gearbox body and both are installed on the base, the rotating shaft of the drive motor is connected to one end of the coupling, the other end of the coupling is connected to one end of the drive main shaft, the other end of the drive main shaft is placed in the gearbox body after passing through the corresponding through hole on the gearbox cover, the main shaft gear is placed in the gearbox body, and the gear plates of all the drive terminal assemblies are placed in the gearbox body; the drive terminal assembly also includes a connecting shaft, a connecting plate and a mounting plate, in each of the drive terminal assemblies, the first end of the transmission shaft is connected to the first end of the two ends of the connecting shaft, the second end of the two ends of the connecting shaft is connected to the first end of the brush drive shaft, and the second end of the two ends of the transmission shaft is connected to the first end of the brush drive shaft. The second end passes through the corresponding through hole on the gearbox cover, the first end of the transmission shaft passes through the corresponding through hole on the box wall of the gearbox body away from the gearbox cover, the connecting plate is installed on the side of the gearbox body away from the gearbox cover, the mounting plate is installed on the connecting plate, the resistor mounting seat is installed on the mounting plate, the first end of the connecting shaft passes through the corresponding through hole on the connecting plate, and the second end of the connecting shaft passes through the corresponding through hole on the mounting plate; bearings are respectively installed between the driving main shaft and the corresponding through hole wall of the gearbox cover, between the second end of each of the transmission shafts and the corresponding through hole wall on the gearbox cover, between the first end of each of the transmission shafts and the corresponding through hole wall on the gearbox body, between the first end of the connecting shaft and the corresponding through hole wall on the connecting plate, between the second end of the connecting shaft and the corresponding through hole wall on the mounting plate, and between the brush drive shaft and the central through hole wall of the resistor mounting seat.

[0010] Preferably, in order to facilitate accurate rotation counting function and installation, the rotation counting device includes a magnetic induction counter and a magnet, and the magnet is installed on a side surface of one of the gear plates close to the gearbox cover, and the induction probe of the magnetic induction counter passes through the corresponding through hole on the gearbox cover and is close to the magnet.

[0011] Preferably, in order to prevent dust from contaminating the resistor and brushes during the test and reducing the test accuracy, the drive terminal assembly also includes a dust cover, which is installed on the side of the mounting plate away from the connecting plate, and the resistor mounting seat and the brush are both placed in the dust cover.

[0012] Preferably, in order to realize synchronous testing of multiple resistors to improve test efficiency and facilitate synchronous and unidirectional driving, there are six drive terminal assemblies, the outer diameter of the gear plate is larger than the outer diameter of the main shaft gear, the gear plates of the six drive terminal assemblies are divided into two groups, and the three gear plates in each group are arranged on the same horizontal line, the upper and lower groups of gear plates are respectively located on the upper and lower sides of the main shaft gear, the gear plates in the middle of the upper and lower groups of gear plates are directly meshed and connected with the main shaft gear, the gear plates at both ends of the upper and lower groups of gear plates are respectively meshed and connected with the gear plates in the middle of the corresponding group through transmission gears, the transmission gear is mounted on the transmission gear shaft, and the two ends of the transmission gear shaft respectively pass through the corresponding through holes on the gear box cover and the corresponding through holes on the gear box body and are connected through transmission bearings.

[0013] Preferably, in order to facilitate installation of the drive motor and adjustment of its rotation speed, the drive motor is installed on the base via a plurality of mounting columns, and a speed regulator is connected to the input end of the drive motor.

[0014] Preferably, in order to facilitate the installation of the speed regulator, a top plate is connected to the base through a column, the top plate is located above the drive motor, and the speed regulator is installed on the top plate. At the same time, the magnetic induction counter is also installed on the top plate.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides a driving motor, a driving spindle, a rotation counting device and a plurality of driving terminal assemblies. The transmission shafts of the plurality of driving terminal assemblies are driven by one driving motor to drive the resistor mounting seats to rotate synchronously. It is only necessary to mount the plurality of conductive plastic resistors to be tested on the resistor mounting seats of the plurality of driving terminal assemblies. Thus, the life test of the plurality of conductive plastic resistors can be completed at one time. Compared with the traditional assembly of potentiometers, the test is simpler and faster, and the test result is not affected by other structures of the potentiometer, thereby improving the test accuracy and efficiency. The entire test device can be reused, thereby reducing the test cost.

[0017] More specific advantages are as follows: the problem of poor accuracy of the number of cycles in the life test of resistors is solved. With this device, the magnetic induction counter and the magnet can be used to accurately count, and the progress of the test can be known at any time; the problem of time and material consumption in the life test of resistors is solved. With this device, it is only necessary to prepare the resistor before the test, and prepare the brush-related components according to the test conditions such as the contact pressure between the brush and the resistor, without consuming the remaining parts to assemble into a complete potentiometer product, which can greatly save labor costs, time costs and material costs, and the preparation work before the test is simple, and the economic efficiency of the test is greatly improved; due to the combined use of the drive motor, gear transmission, and speed regulator, the test can be carried out according to the test conditions. The test requires the control of the speed of the brush to meet the diversified resistor life test conditions (speed) requirements; each drive terminal component is relatively independent, and each drive terminal component can be installed on the gearbox body after a certain size adjustment according to the resistor test conditions (pressure, size, etc.), without the need to disassemble the gearbox body and other structures, it is easy to use and can meet the diversified resistor life test needs; this test device can realize the life test of 6 resistors at the same time (generally 4 resistors are tested at the same time in actual use), with high test efficiency, and the transmission structure in the gearbox body can also be expanded according to actual conditions to meet the needs of simultaneous testing of more resistors. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the conductive plastic resistor life test device for the angular displacement potentiometer of the present invention;

[0019] Figure 2 It is a partial cross-sectional left-side structural schematic diagram of the conductive plastic resistor life test device for angular displacement potentiometers according to the present invention;

[0020] Figure 3 It is a schematic diagram of the top view of the conductive plastic resistor life test device for angular displacement potentiometers according to the present invention;

[0021] Figure 4 It is an enlarged view of "A" in the partial cross-sectional left view structural schematic diagram of the conductive plastic resistor life test device for the angular displacement potentiometer of the present invention;

[0022] Figure 5 The present invention is a schematic diagram of the transmission structure between the main shaft gear and the gear plates of each drive terminal assembly of the conductive plastic resistor life test device for angular displacement potentiometers.

[0023] In the figure, 1-speed regulator, 2-magnetic induction counter, 3-top plate, 4-gearbox body, 5-mounting plate, 6-dust cover, 7-base, 8-drive motor, 9-column, 10-mounting column, 11-coupling, 12-gearbox cover, 13-connecting plate, 14-induction probe, 15-bearing cover, 16-bearing, 17-drive spindle, 18-gear plate, 19-magnet, 20-transmission shaft, 21-connecting shaft, 22-brush drive shaft, 23-resistance body mounting seat, 24-conductive plastic resistor, 25-brush, 26-fixing nut, 27-transmission gear, 28-spindle gear. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] like Figure 1-Figure 5 As shown, the conductive plastic resistor life test device for angular displacement potentiometer of the present invention comprises a base 7, a drive motor 8, a drive spindle 17, a rotation counting device and a plurality of drive terminal assemblies, wherein the drive terminal assemblies comprise a gear plate 18, a transmission shaft 20, a brush drive shaft 22, a brush 25 and a resistor mounting seat 23. In each of the drive terminal assemblies, the transmission shaft 20 passes through the central through hole of the gear plate 18 and is connected to each other (for example, by a radial key connection), a first end of the transmission shaft 20 is connected to a first end of the brush drive shaft 22, and a second end of the brush drive shaft 22 passes through the resistor mounting seat The brush 25 is mounted on the second end of the brush drive shaft 22 (the outer wall of which is provided with an external thread) through a fixing nut 26. A mounting groove (not marked in the figure) for mounting a conductive plastic resistor 24 is provided on the surface of the resistor mounting seat 23 on one side close to the brush 25; a driving motor 8 is mounted on the base 7, and a rotating shaft of the driving motor 8 is connected to one end of a driving spindle 17. A spindle gear 28 is provided on the driving spindle 17. The spindle gear 28 is respectively meshed and connected with a plurality of gear plates 18 of the driving terminal assemblies. The rotation counting device is used to detect the number of rotations of the gear plate 18 or the transmission shaft 20. The installation method of the above-mentioned conductive plastic resistor 24 in the mounting groove is determined according to needs. For example, a plurality of pressing plates distributed in the circumferential direction can be used to press the outer peripheral edge of the conductive plastic resistor 24, and the pressing plates can be installed on the resistor mounting seat 23 by screws. A gasket can be installed between the bottom of the mounting groove and the conductive plastic resistor 24 to adjust the distance between the conductive plastic resistor 24 and the brush 25, thereby changing the contact pressure between the two.

[0026] like Figure 1-Figure 5 As shown, the present invention also discloses the following multiple more optimized specific structures. According to actual needs, the above structure can be superimposed and combined with one or more of the following structures to form a more optimized technical solution.

[0027] In order to facilitate gear transmission and place the gear transmission structure in a closed space to improve safety and facilitate the installation of gear transmission components, the conductive plastic resistor life test device for angular displacement potentiometer also includes a coupling 11, a gearbox body 4 and a gearbox cover 12, the gearbox cover 12 is connected to the gearbox body 4 and both are installed on the base 7, the rotating shaft of the drive motor 8 is connected to one end of the coupling 11, the other end of the coupling 11 is connected to one end of the drive main shaft 17, the other end of the drive main shaft 17 passes through the corresponding through hole on the gearbox cover 12 and is placed in the gearbox body 4, the main shaft gear 28 is placed in the gearbox body 4, and the gear plates 18 of all the drive terminal assemblies are placed in the gearbox body 4; the drive terminal assembly also includes a connecting shaft 21, a connecting plate 13 and a mounting plate 5, in each of the drive terminal assemblies, the first end of the transmission shaft 20 is connected to the first end of the two ends of the connecting shaft 21, the second end of the two ends of the connecting shaft 21 is connected to the first end of the brush drive shaft 22, the second end of the two ends of the transmission shaft 20 passes through the corresponding through hole on the gearbox cover 12, and the first end of the transmission shaft 20 passes through the variable The corresponding through holes on the box wall of the gearbox body 4 away from the gearbox cover 12, the connecting plate 13 is installed on the side of the gearbox body 4 away from the gearbox cover 12, the mounting plate 5 is installed on the connecting plate 13, the resistor mounting seat 23 is installed on the mounting plate 5, the first end of the connecting shaft 21 passes through the corresponding through hole on the connecting plate 13, and the second end of the connecting shaft 21 passes through the corresponding through hole on the mounting plate 5; between the driving main shaft 17 and the corresponding through hole wall of the gearbox cover 12, between the second end of each transmission shaft 20 and the corresponding through hole wall on the gearbox cover 12, and between each Bearings 16 are installed respectively between the first end of a transmission shaft 20 and the corresponding through-hole wall on the gearbox body 4, between the first end of the connecting shaft 21 and the corresponding through-hole wall on the connecting plate 13, between the second end of the connecting shaft 21 and the corresponding through-hole wall on the mounting plate 5, and between the brush drive shaft 22 and the central through-hole wall of the resistor mounting seat 23. Note: The bearing 16 here refers to an assembly of products such as bearings, and does not refer to bearings of the same model and size. Bearings 16 of different sizes can be installed at different positions according to actual application needs.

[0028] In order to facilitate the accurate rotation counting function and facilitate installation, the rotation counting device includes a magnetic induction counter 2 and a magnet 19. The magnet 19 is installed on a gear plate 18 (it can be installed on any gear plate 18, or multiple magnetic induction counters 2 and magnets 19 can be set as needed, and multiple magnets 19 are installed on multiple gear plates 18) close to the side surface of the gearbox cover 12, and the induction probe 14 of the magnetic induction counter 2 passes through the corresponding through hole on the gearbox cover 12 and is close to the magnet 19.

[0029] In order to prevent dust from contaminating the resistor and brush during the test and reducing the test accuracy, the drive terminal assembly also includes a dust cover 6, which is installed on the side of the mounting plate 5 away from the connecting plate 13, and the resistor mounting seat 23 and the brush 25 are both placed in the dust cover 6.

[0030] In order to realize synchronous testing of multiple resistors to improve the test efficiency and facilitate synchronous and unidirectional driving, there are six drive terminal assemblies, the outer diameter of the gear plate 18 is larger than the outer diameter of the main shaft gear 28, and the gear plates 18 of the six drive terminal assemblies are divided into two groups, and the three gear plates 18 in each group are arranged on the same horizontal line. The upper and lower groups of gear plates 18 are respectively located on the upper and lower sides of the main shaft gear 28, and the middle gear plates 18 of the upper and lower groups of gear plates 18 are directly meshed and connected with the main shaft gear 28 respectively. The gear plates 18 located at both ends of the upper and lower groups of gear plates 18 are respectively meshed and connected with the corresponding middle gear plates 18 of the group through transmission gears 27. The transmission gear 27 is mounted on a transmission gear shaft (not shown in the figure), and the two ends of the transmission gear shaft respectively pass through the corresponding through holes on the gearbox cover 12 and the corresponding through holes on the gearbox body 4 and are connected through transmission bearings. The outer diameter of the transmission gear 27 is the same as the outer diameter of the main shaft gear 28.

[0031] In order to facilitate installation of the drive motor 8 and adjustment of its rotation speed, the drive motor 8 is installed on the base 7 via a plurality of mounting columns 10 , and the input end of the drive motor 8 is connected to the speed regulator 1 .

[0032] In order to facilitate the installation of the speed regulator 1, a top plate 3 is connected to the base 7 through a plurality of columns 9. The top plate 3 is located above the driving motor 8. The speed regulator 1 and the magnetic induction counter 2 are respectively installed on the top plate 3.

[0033] Figure 4 Also shown is a bearing cover 15 for protection against dust.

[0034] like Figure 1-Figure 5 As shown, when used, multiple conductive plastic resistors 24 are respectively installed in the mounting grooves of the resistor mounting seats 23 of multiple drive terminal assemblies and fixed, the power supply of the magnetic induction counter 2 is turned on, the drive motor 8 (using a DC motor) is started, and the speed regulator 1 is adjusted so that the speed of the drive motor 8 reaches the designed value; after transmission, the magnet 19 installed on the gear plate 18 rotates synchronously with the gear plate 18, and the brush 25 rotates synchronously with the brush drive shaft 22, and the brush 25 contacts and slides on the working belt of the conductive plastic resistor 24. When the magnet 19 approaches the induction probe 14 of the magnetic induction counter 2, the magnetic induction counter 2 counts once, and this continues, and the number of rotations of the brush 25 can be accurately counted, that is, the number of rotation life cycles of the conductive plastic resistor 24.

[0035] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A conductive plastic resistor life test device for an angular displacement potentiometer, characterized in that: It includes a base, a driving motor, a driving spindle, a rotation counting device and a plurality of driving terminal components, wherein the driving terminal components include a gear plate, a transmission shaft, a brush driving shaft, a brush and a resistor body mounting seat, wherein in each of the driving terminal components, the transmission shaft passes through the central through hole of the gear plate and are connected to each other, the first end of the two ends of the transmission shaft is connected to the first end of the two ends of the brush driving shaft, the second end of the two ends of the brush driving shaft passes through the central through hole of the resistor body mounting seat and can rotate freely, the brush is mounted on the second end of the brush driving shaft, and a mounting groove for mounting a conductive plastic resistor is provided on a side surface of the resistor body mounting seat close to the brush; the driving motor is mounted on the On the base, the rotating shaft of the driving motor is connected to one end of the driving main shaft, and the driving main shaft is provided with a main shaft gear, and the main shaft gear is respectively meshed and connected with the gear plates of the plurality of driving terminal assemblies, and the rotation counting device is used to detect the number of rotations of the gear plate or the transmission shaft; the conductive plastic resistor life test device for angular displacement potentiometer also includes a coupling, a gearbox body and a gearbox cover, the gearbox cover is connected to the gearbox body and both are installed on the base, the rotating shaft of the driving motor is connected to one end of the coupling, and the other end of the coupling is connected to one end of the driving main shaft, and the other end of the driving main shaft passes through the corresponding through hole on the gearbox cover and is placed in the In the gearbox body, the main shaft gear is placed in the gearbox body, and the gear plates of all the drive terminal assemblies are placed in the gearbox body; the drive terminal assembly also includes a connecting shaft, a connecting plate and a mounting plate. In each of the drive terminal assemblies, the first end of the transmission shaft is connected to the first end of the connecting shaft, the second end of the connecting shaft is connected to the first end of the brush drive shaft, the second end of the transmission shaft passes through the corresponding through hole on the gearbox cover, the first end of the transmission shaft passes through the corresponding through hole on the box wall of the gearbox body away from the gearbox cover, the connecting plate is installed on the side of the gearbox body away from the gearbox cover, and the mounting plate is installed on The resistor body mounting seat is mounted on the connecting plate, the first end of the connecting shaft passes through the corresponding through hole on the connecting plate, and the second end of the connecting shaft passes through the corresponding through hole on the mounting plate; bearings are respectively installed between the driving main shaft and the corresponding through hole wall of the gearbox cover, between the second end of each of the transmission shafts and the corresponding through hole wall on the gearbox cover, between the first end of each of the transmission shafts and the corresponding through hole wall on the gearbox body, between the first end of the connecting shaft and the corresponding through hole wall on the connecting plate, between the second end of the connecting shaft and the corresponding through hole wall on the mounting plate, and between the brush driving shaft and the central through hole wall of the resistor body mounting seat;The rotation counting device includes a magnetic induction counter and a magnet, wherein the magnet is mounted on a side surface of one of the gear plates close to the gearbox cover, and the induction probe of the magnetic induction counter passes through a corresponding through hole on the gearbox cover and is close to the magnet. ; 2. The conductive plastic resistor life test device for angular displacement potentiometer according to claim 1, characterized in that: The drive terminal assembly also includes a dust cover, which is installed on a side of the mounting plate away from the connecting plate, and the resistor mounting seat and the brush are both placed in the dust cover.

3. The conductive plastic resistor life test device for angular displacement potentiometer according to claim 1, characterized in that: There are six drive terminal assemblies, and the outer diameter of the gear plate is larger than the outer diameter of the main shaft gear. The gear plates of the six drive terminal assemblies are divided into two groups, and the three gear plates in each group are arranged on the same horizontal line. The upper and lower groups of gear plates are respectively located on the upper and lower sides of the main shaft gear, and the gear plates located in the middle of the upper and lower groups of gear plates are directly meshed and connected with the main shaft gear, and the gear plates located at both ends of the upper and lower groups of gear plates are respectively meshed and connected with the gear plates in the middle of the corresponding group through transmission gears. The transmission gear is mounted on the transmission gear shaft, and the two ends of the transmission gear shaft respectively pass through the corresponding through holes on the gear box cover and the corresponding through holes on the gear box body and are connected through transmission bearings.

4. The conductive plastic resistor life test device for angular displacement potentiometer according to any one of claims 1 to 3, characterized in that: The driving motor is installed on the base through a plurality of mounting columns, and the input end of the driving motor is connected to a speed regulator.

5. The conductive plastic resistor life test device for angular displacement potentiometer according to claim 4, characterized in that: The base is connected with a top plate via a column, the top plate is located above the driving motor, and the speed regulator is mounted on the top plate.

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