Temperature coefficient testing device for conductive plastic potentiometer resistor body

Abstract

The utility model discloses a temperature coefficient testing device for a conductive plastic potentiometer resistor body, which comprises an insulating bottom plate, an insulating guide rod and a plurality of clamping assemblies, the two ends of the insulating guide rod are respectively arranged on the insulating bottom plate through a guide rod seat, and the plurality of clamping assemblies are respectively arranged on the insulating guide rod. The clamping assembly comprises a clamping base, a clamping pressing plate and a clamping bolt, a base through hole is formed in the clamping base, the insulating guide rod penetrates through the base through hole, the conductive clamping pressing plate is arranged above the clamping base, and a screw rod of the clamping bolt penetrates through a pressing plate through hole in the clamping pressing plate and then is connected with a base screw hole in the clamping base. A base V-shaped part is arranged on the clamping base, a pressing plate V-shaped part is arranged on the clamping pressing plate, and a contact part is arranged below the end part of the pressing plate V-shaped part. According to the utility model, the reliable clamping function of a plurality of circular resistor bodies and a plurality of long-strip-shaped resistor bodies can be realized, welding and dewelding are not needed, the time and labor costs are reduced, and the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a testing device for a conductive plastic potentiometer, in particular to a temperature coefficient testing device for a resistor of a conductive plastic potentiometer. Background Art

[0002] Conductive plastic potentiometer is a potentiometer based on conductive plastic resistor. It includes angular displacement potentiometer and linear displacement potentiometer according to the different displacement forms to be detected. Generally, the resistor used in angular displacement potentiometer is round or arc-shaped, and the resistor used in linear displacement potentiometer is long strip.

[0003] Before the conductive plastic potentiometer resistor is formally assembled to form a potentiometer, it needs to undergo a series of electrical performance tests, such as total resistance, stroke, tap resistance, temperature coefficient, etc. Among them, the temperature coefficient test is used to test the coefficient of the resistor body changing with temperature. It needs to be placed in an oven and loaded with power, which is an important electrical performance test item.

[0004] The traditional temperature coefficient test method for conductive plastic potentiometer resistors is as follows: first solder a test wire to each end of the working strip on the resistor, then connect the other end of the test wire to the resistance test equipment. The resistor with the soldered wires is then placed in an oven and the oven temperature is gradually increased. The resistance values ​​corresponding to different temperatures are recorded from the resistance test equipment. The temperature coefficient of the resistor is calculated according to the formula. After the test is completed, the test wires are desoldered and removed from both ends of the resistor.

[0005] The above-mentioned traditional temperature coefficient test method for conductive plastic potentiometer resistors has the following defects: it requires repeated soldering and desoldering, which is extremely labor-intensive, increasing time and labor costs, and has low test efficiency, especially in large-scale production. The test efficiency is very low, affecting the production efficiency and delivery cycle of the potentiometer. In addition, multiple soldering may affect the reliability of the solder joints on the resistor body, thereby affecting the quality of the potentiometer. Utility Model Content

[0006] The purpose of the utility model is to provide a temperature coefficient testing device for a resistor of a conductive plastic potentiometer, which has the advantages of simple and quick operation and high testing efficiency, in order to solve the above problems.

[0007] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0008] A temperature coefficient test device for a conductive plastic potentiometer resistor, comprising an insulating base plate, an insulating guide rod and a clamping assembly, wherein the two ends of the transverse insulating guide rod are respectively mounted on the transverse insulating base plate through a guide rod seat, and a plurality of the clamping assemblies are respectively mounted on the insulating guide rod, the clamping assembly comprising a clamping base, a clamping pressure plate and a clamping bolt, the clamping base is provided with a transverse base through-hole and the insulating guide rod passes through the base through-hole, the hole wall of the base through-hole is provided with a transverse locking screw hole and the locking screw is mounted in the locking screw hole and can tighten the insulating guide rod, the conductive clamping pressure plate The plate is placed above the clamping base, and the screw of the clamping bolt passes through the pressure plate through hole on the clamping pressure plate and is connected to the base screw hole on the clamping base. The vertical planes on both sides of the clamping base near one end have an angle to form a "V"-shaped part of the base, and the end width of the "V"-shaped part of the base is narrower. The vertical planes on both sides of the clamping pressure plate near one end have an angle to form a "V"-shaped part of the pressure plate, and the end width of the "V"-shaped part of the pressure plate is narrower. The "V"-shaped part of the pressure plate is located directly above the "V"-shaped part of the base and corresponds to each other, and a downwardly protruding contact part is provided below the end of the "V"-shaped part of the pressure plate.

[0009] Preferably, in order to facilitate the clamping and removal operations of the resistor body, the clamping assembly also includes a compression spring, the clamping bolt includes a height adjustment bolt and a tightening bolt, there are two pressure plate through holes, one of which is provided at the wider end of the "V"-shaped portion of the pressure plate, and the other pressure plate through hole is provided at the other end of the clamping pressure plate opposite to the contact portion, there are two base screw holes, one of which is provided at the wider end of the "V"-shaped portion of the base, and the other base screw hole is provided in the middle section of the clamping base, the two vertical compression springs are respectively located between the clamping base and the clamping pressure plate, the screw of the height adjustment bolt and the screw of the tightening bolt respectively pass through the two pressure plate through holes and the center through holes of the two compression springs and are connected to the two base screw holes, and the tightening bolt is located between the height adjustment bolt and the contact portion.

[0010] Preferably, in order to facilitate the rapid compression and clamping operation of the resistor and facilitate application, the outer diameter of the upper section of the clamping bolt is increased to form a large diameter section, and the upper end face of the large diameter section is provided with a square countersunk hole, and the lower center position of the plastic handle with an outer diameter greater than that of the large diameter section is provided with a downwardly protruding square boss, and the square boss is placed in the square countersunk hole, and the screw rod of the transverse connecting screw passes through the connecting through hole on the hole wall of the square countersunk hole and is connected to the connecting screw hole on the square boss.

[0011] Preferably, in order to be able to drive the plastic handle to rotate by other tools when needed, a transverse operating through hole is provided on the plastic handle.

[0012] Preferably, in order to facilitate the reliable installation of the compression spring, the upper hole wall of the base screw hole expands toward the peripheral direction to form a base compression spring positioning countersunk hole, and the lower end of the compression spring is placed in the corresponding compression spring positioning countersunk hole, and the lower hole wall of the pressure plate through hole expands toward the peripheral direction to form a pressure plate compression spring positioning countersunk hole, and the upper end of the compression spring is placed in the corresponding pressure plate compression spring positioning countersunk hole.

[0013] Preferably, in order to facilitate the clamping of more circular resistors and long strip resistors, the insulating guide rods are two parallel to each other, and multiple clamping assemblies are installed on each insulating guide rod. The "V"-shaped portion of the pressure plate and the "V"-shaped portion of the base of all the clamping assemblies are located between the two insulating guide rods.

[0014] Preferably, in order to better clamp the circular resistor, the "V"-shaped portion of the base is bent 10°-30° toward one end of the base through hole, and multiple groups of the clamping assemblies are installed on the same insulating guide rod. The same group of clamping assemblies includes two adjacent clamping assemblies, and the ends of the base "V"-shaped portions of the two clamping assemblies in the same group are close to each other.

[0015] Preferably, in order to better realize the anti-rotation function of the clamping assembly, the radial cross-section of the base through hole and the radial cross-section of the insulating guide rod are both rectangular.

[0016] Preferably, in order to facilitate the installation of the insulating guide rod on the insulating base plate through the guide rod seat, the guide rod seat is an "L"-shaped connecting plate, the horizontal plate of the guide rod seat is located on the insulating base plate and the vertical mounting bolts pass through the corresponding through holes on the horizontal plate and are connected to the corresponding screw holes on the insulating base plate, the vertical plate of the guide rod seat is provided with a guide rod seat through hole and one end of the insulating guide rod is placed in the guide rod seat through hole, and the mounting screws pass through the corresponding through holes on the hole wall of the guide rod seat through hole and are connected to the corresponding screw holes at the end of the insulating guide rod.

[0017] Preferably, in order to facilitate the centralized lead-out of the test wires, a transverse test wire groove is provided at the bottom of the guide rod seat, and test wire positioning seats are respectively installed on the insulating bottom plate near the two ends of the insulating guide rod, and a transverse lead groove is provided below the test wire positioning seat.

[0018] The beneficial effects of the present invention are:

[0019] The V-shaped portion of the clamping plate is provided on the clamping base, the V-shaped portion of the clamping plate is provided on the clamping pressure plate, and a downwardly protruding contact portion is provided below the end of the V-shaped portion of the clamping plate. When used, the circular resistor body can be placed on the two mutually adjacent V-shaped portions of the base, and the contact portions below the V-shaped portions of the two mutually adjacent pressure plates can be used to reliably contact the two ends of the working belt above the circular resistor body. The two ends of the long strip resistor body can also be placed on the two base V-shaped portions, and the contact portions below the V-shaped portions of the two pressure plates can be used to reliably contact the two ends of the working belt above the long strip resistor body. In this way, the reliable clamping function of multiple circular resistor bodies and multiple long strip resistor bodies is achieved, and welding and desoldering are not required, which reduces time and labor costs and improves testing efficiency. The utility model is particularly beneficial for mass production testing of potentiometers, and is beneficial for ensuring the reliability of the solder joints on the resistor body, ensuring that the quality of the potentiometers is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a three-dimensional diagram of the temperature coefficient testing device for the resistor of a conductive plastic potentiometer according to the present invention;

[0021] Figure 2 This is a perspective view of the clamping assembly of the temperature coefficient testing device for the resistor of a conductive plastic potentiometer according to the present invention before assembly;

[0022] Figure 3 This is a three-dimensional diagram of the assembled clamping assembly of the temperature coefficient testing device for the resistor of a conductive plastic potentiometer according to the present invention;

[0023] Figure 4 This is a three-dimensional diagram of an insulating guide rod, two corresponding guide rod seats, and multiple clamping components of the temperature coefficient testing device for a conductive plastic potentiometer resistor according to the present invention;

[0024] Figure 5 This is a three-dimensional diagram of the temperature coefficient testing device for the resistor of a conductive plastic potentiometer of the present invention when in use. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] like Figure 1-Figure 4As shown, the temperature coefficient testing device for the resistor of a conductive plastic potentiometer described in the present invention includes an insulating base plate 4, an insulating guide rod 3 and a clamping assembly 5. The two ends of the transverse insulating guide rod 3 are respectively mounted on the upper surface of the transverse insulating base plate 4 through the guide rod seat 2. A plurality of clamping assemblies 5 are respectively mounted on the insulating guide rod 3. The clamping assembly 5 includes a clamping base 67, a clamping pressure plate 63 and a clamping bolt. The clamping base 67 is provided with a transverse base through hole 69 and the insulating guide rod 3 passes through the base through hole 69. The hole wall of the base through hole 69 is provided with a transverse locking screw hole (not marked in the figure) and the locking screw 68 is installed in the locking screw hole and can tighten the insulating guide rod 3. The conductive clamping pressure plate 63 is provided with a transverse locking screw hole (not marked in the figure) and the insulating guide rod 3 is tightened. The plate 63 is placed above the clamping base 67, and the screw of the clamping bolt passes through the pressure plate through hole 62 on the clamping pressure plate 63 and is connected to the base screw hole 66 on the clamping base 67. The vertical planes on both sides near one end of the clamping base 67 have an angle to form a base "V"-shaped portion 70, and the end width of the base "V"-shaped portion 70 is relatively narrow. The vertical planes on both sides near one end of the clamping pressure plate 63 have an angle to form a pressure plate "V"-shaped portion 61, and the end width of the pressure plate "V"-shaped portion 61 is relatively narrow. The pressure plate "V"-shaped portion 61 is located directly above the base "V"-shaped portion 70 and corresponds to each other. A downwardly protruding contact portion 59 is provided below the end of the pressure plate "V"-shaped portion 61.

[0027] like Figure 1-Figure 4 As shown, the present invention also discloses the following multiple more optimized specific structures:

[0028] In order to facilitate the clamping and removal of the resistor, the clamping assembly 5 also includes a compression spring 64, and the clamping bolt includes a height adjustment bolt 60 and a tightening bolt 58. There are two pressure plate through holes 62, and one of the pressure plate through holes 62 is arranged at the wider end of the pressure plate "V"-shaped portion 61, and the other pressure plate through hole 62 is arranged at the other end of the clamping pressure plate 63 opposite to the contact portion 59. There are two base screw holes 66, and one of the base screw holes 66 is arranged at the wider end of the base "V"-shaped portion 70, and the other base screw hole 66 is arranged in the middle section of the clamping base 67. The two vertical compression springs 64 are respectively located between the clamping base 67 and the clamping pressure plate 63. The screw of the height adjustment bolt 60 and the screw of the tightening bolt 58 respectively pass through the two pressure plate through holes 62 and the center through holes of the two compression springs 64 and are connected to the two base screw holes 66. The tightening bolt 58 is located between the height adjustment bolt 60 and the contact portion 59.

[0029] In order to facilitate the rapid compression and clamping operation of the resistor body and facilitate application, the outer diameter of the upper section of the clamping bolt 58 is increased to form a large diameter section 55, and the upper end face of the large diameter section 55 is provided with a square countersunk hole 53. The plastic handle 51, which has an outer diameter larger than the large diameter section 55 and is circular, is provided with a downwardly protruding square boss 52 at the lower center position. The square boss 52 is placed in the square countersunk hole 53, and the screw rod of the horizontal connecting screw 57 passes through the connecting through hole 56 on the hole wall of the square countersunk hole 53 and is connected to the connecting screw hole on the square boss 52.

[0030] In order to be able to drive the plastic handle 51 to rotate by other tools when needed, a transverse operating through hole 54 is provided on the plastic handle 51 .

[0031] In order to facilitate the reliable installation of the compression spring 64, the upper hole wall of the base screw hole 66 expands toward the peripheral direction to form a base compression spring positioning countersunk hole 65, and the lower end of the compression spring 64 is placed in the corresponding compression spring positioning countersunk hole 65. The lower hole wall of the pressure plate through hole 62 expands toward the peripheral direction to form a pressure plate compression spring positioning countersunk hole (not visible in the figure), and the upper end of the compression spring 64 is placed in the corresponding pressure plate compression spring positioning countersunk hole.

[0032] In order to facilitate the clamping of more circular resistors and long strip resistors, the insulating guide rods 3 are two parallel to each other, and multiple clamping components 5 are installed on each insulating guide rod 3. The pressure plate "V"-shaped portion 61 and the base "V"-shaped portion 70 of all the clamping components 5 are located between the two insulating guide rods 3.

[0033] In order to better clamp the circular resistor, the "V"-shaped portion 70 of the base is bent 10°-30° toward one end of the base through hole 69. Multiple groups of clamping assemblies 5 are installed on the same insulating guide rod 3. The same group of clamping assemblies 5 includes two adjacent clamping assemblies 5, and the ends of the base "V"-shaped portion 70 of the two clamping assemblies 5 of the same group are close to each other.

[0034] In order to better realize the anti-rotation function of the clamping assembly 5, the radial cross-section of the base through hole 69 and the radial cross-section of the insulating guide rod 3 are both rectangular.

[0035] In order to facilitate the installation of the insulating guide rod 3 on the insulating base plate 4 through the guide rod seat 2, the guide rod seat 2 is an "L"-shaped connecting plate, the horizontal plate of the guide rod seat 2 is located on the insulating base plate 4 and the vertical mounting bolts (not marked in the figure) pass through the corresponding through holes on the horizontal plate and are connected to the corresponding screw holes on the insulating base plate 4, the vertical plate of the guide rod seat 2 is provided with a guide rod seat through hole 21 and one end of the insulating guide rod 3 is placed in the guide rod seat through hole 21, and the mounting screws (not marked in the figure) pass through the corresponding through holes on the hole wall of the guide rod seat through hole 21 and are connected to the corresponding screw holes 31 at the end of the insulating guide rod 3.

[0036] In order to facilitate the centralized leading out of the test lines, a horizontal test line groove 22 is provided at the bottom of the guide rod seat 2, and a test line positioning seat 1 is respectively installed on the insulating base plate 4 near the two ends of the insulating guide rod 3, and a horizontal lead groove is provided under the test line positioning seat 1 (not visible in the figure).

[0037] The above-mentioned insulating base plate 4 and insulating guide rod 3 are made of insulating materials, the clamping pressure plate 63 (including the pressure plate "V"-shaped portion 61) is made of metal material, and the material is more preferably gold-plated copper. The compression spring 64 and all screws and bolts are made of metal, and the plastic handle 51 is made of insulating plastic. On the basis of the above structure, the materials of the clamping base 67 (including the base "V"-shaped portion 70), the guide rod seat 2 and the test line positioning seat 1 are determined according to needs, and are preferably insulating materials; among them, the materials of the insulating base plate 4, the insulating guide rod 3, the clamping base 67, the guide rod seat 2 and the test line positioning seat 1 are more preferably polyetherimide (Polyetherimide, abbreviated as PEI), which is a super engineering plastic made of amorphous polyetherimide.

[0038] like Figure 1-Figure 5 As shown, when used, one end of multiple test lines (test lines covered with an insulating layer, not shown in the figure) is first connected to multiple clamping plates 63 respectively. The connection method is preferably to install the connection terminal between the nut of the height adjustment bolt 60 and the clamping plate 63. After the connection, the multiple test lines are respectively passed through the test line slot 22 of the corresponding guide rod seat 2 and the lead groove of the test line positioning seat 1 to realize the centralized lead-out function. The process of connecting one end of the multiple test lines to the multiple clamping plates 63 can also be completed in advance; according to the number of circular resistors 8 and / or long strip resistors 9 to be tested ( Figure 5 Only one circular resistor 8 and one long strip resistor 9 are shown in the figure, which is only for example. In actual application, it can be multiple circular resistors 8, or multiple long strip resistors 9, or multiple circular resistors 8 and multiple long strip resistors 9). First, loosen the locking screw 68, adjust the position relationship of the corresponding clamping assembly 5, and then place the multiple circular resistors 8 and / or multiple long strip resistors 9 in appropriate positions and connect them to the corresponding clamping assembly 5. After connection, tighten the locking screw 68 again to achieve the clamping installation of multiple circular resistors 8 and / or multiple long strip resistors 9; then place the test device with the installed resistors in an oven, connect the other end of the test line to the two ends of the resistance testing equipment respectively, test the resistance value of the resistors at different temperatures, and calculate the temperature coefficient to complete the temperature coefficient test of the resistors.

[0039] The above embodiments are only preferred embodiments of the present invention and are not limitations on 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 device for testing the temperature coefficient of a resistor in a conductive plastic potentiometer, comprising an insulating base plate, characterized in that: It also includes an insulating guide rod and a clamping assembly, the two ends of the horizontal insulating guide rod are respectively installed on the horizontal insulating bottom plate through the guide rod seat, and multiple clamping assemblies are respectively installed on the insulating guide rod, and the clamping assembly includes a clamping base, a clamping pressure plate and a clamping bolt. The clamping base is provided with a horizontal base through-hole and the insulating guide rod passes through the base through-hole, the hole wall of the base through-hole is provided with a horizontal locking screw hole and the locking screw is installed in the locking screw hole and can tighten the insulating guide rod, the conductive clamping pressure plate is placed above the clamping base, and the clamp The screw rod of the holding bolt passes through the pressure plate through hole on the clamping pressure plate and is connected to the base screw hole on the clamping base. The vertical planes on both sides of the clamping base near one end have an angle to form a base "V"-shaped part, and the end width of the base "V"-shaped part is narrow. The vertical planes on both sides of the clamping pressure plate near one end have an angle to form a pressure plate "V"-shaped part, and the end width of the pressure plate "V"-shaped part is narrow. The pressure plate "V"-shaped part is located directly above the base "V"-shaped part and corresponds to each other, and a downwardly protruding contact part is provided below the end of the pressure plate "V"-shaped part.

2. The temperature coefficient testing device for a conductive plastic potentiometer resistor according to claim 1, characterized in that: The clamping assembly also includes a compression spring, and the clamping bolt includes a height adjustment bolt and a tightening bolt. There are two pressure plate through holes, one of which is located at the wider end of the "V"-shaped portion of the pressure plate, and the other is located at the other end of the clamping pressure plate opposite to the contact portion. There are two base screw holes, one of which is located at the wider end of the "V"-shaped portion of the base, and the other is located in the middle section of the clamping base. The two vertical compression springs are respectively located between the clamping base and the clamping pressure plate, and the screw rods of the height adjustment bolt and the tightening bolt are respectively connected to the two base screw holes after passing through the two pressure plate through holes and the center through holes of the two compression springs. The tightening bolt is located between the height adjustment bolt and the contact portion.

3. The temperature coefficient testing device for a conductive plastic potentiometer resistor according to claim 2, characterized in that: The outer diameter of the upper section of the clamping bolt is increased to form a large diameter section, and the upper end face of the large diameter section is provided with a square countersunk hole. The lower center position of the plastic handle with an outer diameter larger than that of the large diameter section is provided with a downwardly protruding square boss. The square boss is placed in the square countersunk hole, and the screw rod of the transverse connecting screw passes through the connecting through hole on the hole wall of the square countersunk hole and is connected to the connecting screw hole on the square boss.

4. The temperature coefficient testing device for a conductive plastic potentiometer resistor according to claim 3, characterized in that: A transverse operating through hole is provided on the plastic handle.

5. The temperature coefficient testing device for a conductive plastic potentiometer resistor according to claim 2, characterized in that: The upper hole wall of the base screw hole expands toward the peripheral direction to form a base compression spring positioning countersunk hole, and the lower end of the compression spring is placed in the corresponding compression spring positioning countersunk hole. The lower hole wall of the pressure plate through hole expands toward the peripheral direction to form a pressure plate compression spring positioning countersunk hole, and the upper end of the compression spring is placed in the corresponding pressure plate compression spring positioning countersunk hole.

6. The temperature coefficient testing device for a conductive plastic potentiometer resistor according to any one of claims 1 to 5, characterized in that: The insulating guide rods are two parallel to each other, and a plurality of the clamping assemblies are installed on each of the insulating guide rods. The "V"-shaped portions of the pressure plates and the "V"-shaped portions of the bases of all the clamping assemblies are located between the two insulating guide rods.

7. The temperature coefficient testing device for a conductive plastic potentiometer resistor according to claim 6, characterized in that: The "V"-shaped portion of the base is bent 10°-30° toward one end of the base through hole. Multiple groups of the clamping assemblies are installed on the same insulating guide rod. The same group of the clamping assemblies includes two adjacent clamping assemblies, and the ends of the base "V"-shaped portions of the two clamping assemblies in the same group are close to each other.

8. The temperature coefficient testing device for a conductive plastic potentiometer resistor according to any one of claims 1 to 5, characterized in that: The radial cross-sections of the base through-hole and the insulating guide rod are both rectangular.

9. The temperature coefficient testing device for a conductive plastic potentiometer resistor according to any one of claims 1 to 5, characterized in that: The guide rod seat is an "L"-shaped connecting plate, the horizontal plate of the guide rod seat is located on the insulating base plate and the vertical mounting bolts pass through the corresponding through holes on the horizontal plate and are connected to the corresponding screw holes on the insulating base plate. The vertical plate of the guide rod seat is provided with a guide rod seat through hole and one end of the insulating guide rod is placed in the guide rod seat through hole. The mounting screws pass through the corresponding through holes on the hole wall of the guide rod seat through hole and are connected to the corresponding screw holes at the end of the insulating guide rod.

10. The temperature coefficient testing device for a conductive plastic potentiometer resistor according to claim 9, characterized in that: A transverse test line slot is provided at the bottom of the guide rod seat, and test line positioning seats are respectively installed on the insulating bottom plate near the two ends of the insulating guide rod, and a transverse lead groove is provided below the test line positioning seat.

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