A test device for testing the tremor life of non-wirewound precision potentiometers

Abstract

The present invention discloses a test device for testing the tremor life of a non-wire-wound precision potentiometer, comprising a potentiometer, a base, a motor fixing seat, a potentiometer fixing plate, an eccentric wheel and a swing arm. The motor fixing seat and the potentiometer fixing plate are fixed on the base, a motor is fixedly installed on the top of the motor fixing seat, the motor shaft of the motor is fixedly connected to the center of the eccentric wheel, an eccentric driving pin is eccentrically provided on the eccentric wheel, a long strip-shaped limiting slide groove is opened on the top of the swing arm along the length direction, the eccentric driving pin is slidingly limited and assembled in the limiting slide groove of the swing arm and limited by a limiting nut; the potentiometer is installed on the potentiometer fixing plate, and the bottom of the swing arm is fixedly connected to the potentiometer shaft of the potentiometer. The present invention drives the eccentric wheel to rotate by a motor, the eccentric wheel drives the eccentric driving pin to rotate eccentrically, and the swing arm drives the potentiometer shaft of the potentiometer to rotate left and right, so as to realize a small-angle high-frequency tremor test on the potentiometer, and has the advantages of high reliability, low cost, and convenient operation.

Description

Technical Field

[0001] The invention relates to the technical field of precision potentiometer type displacement sensors, and in particular to a test device for testing the tremor life of a non-wire-wound precision potentiometer. Background Art

[0002] Non-wirewound precision potentiometers are widely used as displacement sensors. The general specification for non-wirewound precision potentiometers, "GJB1865A-2015", clearly stipulates that a tremor life test is required during product identification tests. However, there is currently no reliable tremor life test device for non-wirewound precision potentiometers. The traditional method is to use motors and programming control. As people's requirements for the life and reliability of displacement sensors increase, if non-wirewound precision potentiometers are used as displacement sensors, more stringent small-angle tremor life tests are required. The technical difficulty lies in the need for high-frequency swings at small angles. If motors and programming control are used, it is extremely difficult to achieve, and the reciprocating small-angle forward and reverse rotation of the motor will exceed the service life of the motor. Multiple motors or high-performance motors are often required to achieve the test purpose, which makes the test cost higher. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a test device for testing the vibration life of non-wirewound precision potentiometers. The eccentric wheel is driven by a motor to rotate, and the eccentric wheel drives the eccentric driving pin to rotate eccentrically. The eccentric driving pin drives the pendulum arm to swing left and right. Since the bottom of the pendulum arm is fixedly connected to the potentiometer shaft of the potentiometer, the pendulum arm will drive the potentiometer shaft of the potentiometer to rotate left and right, thereby realizing a small-angle high-frequency vibration test on the potentiometer; there is no need to use high-performance motors and program control, and the potentiometer shaft can be driven to vibrate at high frequency by the pendulum arm with small-angle and high-frequency swing.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A test device for testing the tremor life of a non-wirewound precision potentiometer, comprising a potentiometer, a base, a motor fixing seat, a potentiometer fixing plate, an eccentric wheel and a rocker arm, wherein the potentiometer has a potentiometer shaft, the motor fixing seat and the potentiometer fixing plate are fixed on the base, a motor is fixedly mounted on the top of the motor fixing seat, the motor shaft of the motor is fixedly connected to the center of the eccentric wheel, an eccentric driving pin is eccentrically provided on the eccentric wheel, a long strip-shaped limiting groove is opened on the top of the rocker arm along the length direction, the eccentric driving pin is slidably limited and assembled in the limiting groove of the rocker arm and limited by a limiting nut; the potentiometer is mounted on the potentiometer fixing plate, and the bottom of the rocker arm is fixedly connected to the potentiometer shaft of the potentiometer.

[0006] In order to better implement the present invention, the angle of the swing rod's left-right reciprocating swing around the connection position between the potentiometer shaft and the bottom of the swing rod is less than 3 degrees.

[0007] A further technical solution is: the eccentric drive pin is composed of a plug-in part, a sliding part and a threaded column in sequence; the plug-in part of the eccentric drive pin is eccentrically plugged into the eccentric wheel and fixed by a locking screw A; the sliding part of the eccentric drive pin is cooperated in the limiting slide groove of the rocker arm; the threaded column of the eccentric drive pin is threadedly installed with two limiting nuts, and a spring washer is cooperated between the two limiting nuts.

[0008] Preferably, the potentiometer fixing plate is composed of a vertical plate and a horizontal plate and is in an "L" shape as a whole. The horizontal plate of the potentiometer fixing plate is fixed to the top of the base by a plurality of locking screws B. The potentiometer is fixed to the vertical plate of the potentiometer fixing plate by screws. The vertical plate of the potentiometer fixing plate is provided with an axial hole that matches the potentiometer shaft.

[0009] Preferably, the motor has a motor fixing plate, the motor fixing plate of the motor is fixed to the top of the motor fixing seat by screws, and a positioning pin is provided between the motor fixing plate and the top of the motor fixing seat.

[0010] Preferably, the motor shaft of the motor is inserted into the center of the eccentric wheel and fixed by a locking screw C.

[0011] Preferably, the bottom of the rocker arm is connected and fixed to the potentiometer shaft of the potentiometer via a locking screw D.

[0012] Preferably, the eccentric driving pin and the rocker arm are both made of GCr15 steel.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0014] (1) The present invention drives the eccentric wheel to rotate through a motor, and the eccentric wheel drives the eccentric driving pin to rotate eccentrically, and the eccentric driving pin drives the pendulum arm to swing left and right. Since the bottom of the pendulum arm is fixedly connected to the potentiometer shaft of the potentiometer, the pendulum arm drives the potentiometer shaft of the potentiometer to rotate left and right, so that a small-angle high-frequency tremor test of the potentiometer can be realized; there is no need to use a high-performance motor and program control, and the potentiometer shaft is driven to tremble at a high frequency by the pendulum arm with a small-angle high-frequency swing, so the test has high reliability, low cost and convenient operation.

[0015] (2) The present invention adopts an eccentric cam and a rocker arm structure, does not involve software, greatly reduces costs, is easy to manufacture, and has easy replacement of wearing parts and extremely high reliability.

[0016] (3) The present invention adopts the principle of eccentric cam and rocker structure, which ingeniously solves the problem of small-angle high-frequency tremor. The structure is simple and reliable, avoiding complex circuit design and software design, greatly reducing the requirements for motor performance, and reducing the cost of the entire test device. The present invention improves the reliability of the test device, distinguishes the vulnerable parts of the mechanism during the design process, and optimizes the materials and structure, which has good interchangeability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 for Figure 1 A local enlarged schematic diagram in FIG.

[0019] Figure 3 for Figure 1 A schematic diagram of the structure of the swing rod swinging back and forth in the right direction;

[0020] Figure 4 A schematic diagram of the structure of assembling three sets of test components of the present invention.

[0021] The names corresponding to the reference numerals in the accompanying drawings are:

[0022] 1 - motor, 11 - motor shaft, 2 - motor fixing seat, 3 - eccentric wheel, 4 - eccentric driving pin, 41 - plug-in part, 5 - limit nut, 6 - spring washer, 7 - rocker arm, 71 - limit slide groove, 8 - potentiometer, 81 - potentiometer shaft, 9 - potentiometer fixing plate, 10 - base, 12 - motor fixing plate. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with embodiments:

[0024] Example

[0025] like Figure 1 to Figure 3As shown, a test device for testing the tremor life of a non-wirewound precision potentiometer comprises a potentiometer 8, a base 10, a motor fixing base 2, a potentiometer fixing plate 9, an eccentric wheel 3 and a rocker arm 7, wherein the potentiometer 8 has a potentiometer shaft 81, the motor fixing base 2 and the potentiometer fixing plate 9 are fixed on the base 10, a motor 1 is fixedly mounted on the top of the motor fixing base 2, a motor shaft 11 of the motor 1 is fixedly connected to the center of the eccentric wheel 3, an eccentric driving pin 4 is eccentrically provided on the eccentric wheel 3, a long strip-shaped limiting groove 71 is opened on the top of the rocker arm 7 along the length direction, the eccentric driving pin 4 is slidably limited and assembled in the limiting groove 71 of the rocker arm 7 and limited by a limiting nut 5; the potentiometer 8 is mounted on the potentiometer fixing plate 9, and the bottom of the rocker arm 7 is fixedly connected to the potentiometer shaft 81 of the potentiometer 8. The preferred eccentric drive pin 4 and the rocker arm 7 of the present invention are both made of GCr15 steel material. The GCr15 steel material has good heat resistance and can obtain higher hardness after heat treatment. The heat treatment hardness requirement of the present invention is HRC60-70, which improves the wear resistance of the test device during use and improves the service life of the test device. A motor 1, an eccentric wheel 3, an eccentric drive pin 4, a rocker arm 7, and a potentiometer 8 of the present invention constitute a set of test components, and the test component can be used to perform a tremor life test on a potentiometer 8, such as Figure 4 As shown, the present invention can also have three sets of test assemblies (of course, it can also be two test assemblies or more than three test assemblies), so that the three sets of test assemblies are respectively for the three potentiometers 8, and the three potentiometers 8 are synchronously tested for tremor life. The connection relationship of each set of test assemblies is the same, which will not be repeated here. The motor 1 of this embodiment uses a servo motor (the preferred servo motor has a rated speed of 8000 rpm, and the motor speed is adjusted to 3000 rpm in this embodiment), and its temperature resistance reaches 125°C. When in use, the motor 1 performs unidirectional continuous motion, the motor 1 drives the eccentric drive pin 4 to eccentrically move, and the eccentric drive pin 4 drives the swing rod 7 to swing at a fixed frequency, meeting the (60±5) Hz swing frequency requirement.

[0026] like Figure 3 As shown, the angle of the reciprocating left and right swing of the pendulum rod 7 around the potentiometer shaft 81 and the bottom connection position of the pendulum rod 7 is less than 3 degrees (that is, the left and right swing angles are both less than 3 degrees, which can be expressed as ±3 degrees, and the swing angle of this embodiment is preferably ±2.5 degrees). The eccentric distance between the eccentric driving pin 4 and the center of the eccentric wheel 3 of this embodiment is designed to be 2.4 mm, and the vertical height between the center of the eccentric wheel 3 and the center of the potentiometer shaft 81 is 55 mm. In this way, the angle of the reciprocating left and right swing of the pendulum rod 7 around the potentiometer shaft 81 and the bottom connection position of the pendulum rod 7 is 2.5 degrees.

[0027] like Figure 2As shown, the eccentric drive pin 4 is composed of a plug-in portion 41, a sliding portion and a threaded column in sequence. The plug-in portion 41 of the eccentric drive pin 4 is eccentrically plugged into the eccentric wheel 3 and fixed by a locking screw A. The sliding portion of the eccentric drive pin 4 is matched and located in the limiting slide groove 71 of the swing rod 7. The threaded column of the eccentric drive pin 4 is threadedly installed with two limiting nuts 5. There is a left limiting step between the plug-in portion 41 of the eccentric drive pin 4 and the sliding portion. The two limiting nuts 5 constitute a right limiting function between the sliding portion, so that the sliding portion of the eccentric drive pin 4 can be limited in the limiting slide groove 71 of the swing rod 7. A spring washer 6 is matched and assembled between the two limiting nuts 5. In this way, the top of the swing rod 7 is limited and prevented from loosening by using a double nut + spring washer 6, so that the sliding portion of the eccentric drive pin 4 is limited in the limiting slide groove 71 of the swing rod 7, which can effectively reduce the mechanical noise in high-frequency swinging. The remaining connections of the test device are fixed with screws to ensure convenient assembly.

[0028] like Figure 1 As shown, the potentiometer fixing plate 9 is composed of a vertical plate and a horizontal plate and is in an "L" shape as a whole. The horizontal plate of the potentiometer fixing plate 9 is fixed to the top of the base 10 by a plurality of locking screws B. The potentiometer 8 is fixed to the vertical plate of the potentiometer fixing plate 9 by screws. The vertical plate of the potentiometer fixing plate 9 is provided with an axial hole that matches the potentiometer shaft 81.

[0029] like Figure 1 As shown, the motor 1 has a motor fixing plate 12, and the motor fixing plate 12 of the motor 1 is fixed to the top of the motor fixing seat 2 by screws. When there are multiple test assemblies, the motor 1 of each test assembly has a motor fixing plate 12. A positioning pin is provided between the motor fixing plate 12 and the top of the motor fixing seat 2. The motor shaft 11 of the motor 1 is inserted into the center of the eccentric wheel 3 and fixed by a locking screw C; the bottom of the pendulum 7 is connected and fixed to the potentiometer shaft 81 of the potentiometer 8 by a locking screw D.

[0030] When in use, the motor 1 drives the motor shaft 11 to rotate, and the motor shaft 11 drives the eccentric wheel 3 to rotate around the center, and the eccentric driving pin 4 on the eccentric wheel 3 rotates eccentrically, so that the eccentric driving pin 4 slides in the limiting slide groove 71 at the top of the rocker arm 7, so that the rocker arm 7 will swing left and right under the drive of the eccentric driving pin 4, and since the bottom of the rocker arm 7 is fixedly connected to the potentiometer shaft 81 of the potentiometer 8, the rocker arm 7 will drive the potentiometer shaft 81 of the potentiometer 8 to rotate left and right, so that the potentiometer 8 can be subjected to a small-angle high-frequency tremor test (also called a high-frequency left and right swing test or a high-frequency left and right rotation test), and the life of the potentiometer 8 under small-angle high-frequency tremor (that is, the tremor life of the potentiometer 8) can be tested, and it can be used as an important indicator for the factory quality inspection of the potentiometer 8.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A test device for testing the tremor life of a non-wirewound precision potentiometer, comprising a potentiometer (8), wherein the potentiometer (8) has a potentiometer shaft (81), and wherein: The invention also comprises a base (10), a motor fixing base (2), a potentiometer fixing plate (9), an eccentric wheel (3) and a swing rod (7), wherein the motor fixing base (2) and the potentiometer fixing plate (9) are fixed on the base (10), a motor (1) is fixedly mounted on the top of the motor fixing base (2), a motor shaft (11) of the motor (1) is fixedly connected to the center of the eccentric wheel (3), an eccentric driving pin (4) is eccentrically provided on the eccentric wheel (3), a long limiting groove (71) is provided on the top of the swing rod (7) along the length direction, the eccentric driving pin (4) is slidably limited and assembled in the limiting groove (71) of the swing rod (7) and limited by a limiting nut (5); the potentiometer (8 ) is mounted on a potentiometer fixing plate (9), the bottom of the swing rod (7) is fixedly connected to the potentiometer shaft (81) of the potentiometer (8); the angle of the swing rod (7) reciprocating left and right around the connection position of the potentiometer shaft (81) and the bottom of the swing rod (7) is less than 3 degrees; the eccentric drive pin (4) is composed of a plug-in portion (41), a sliding portion and a threaded column in sequence, the plug-in portion (41) of the eccentric drive pin (4) is eccentrically plugged into the eccentric wheel (3) and fixed by a locking screw A, and the sliding portion of the eccentric drive pin (4) is cooperated and located in the limiting slide groove (71) of the swing rod (7); the bottom of the swing rod (7) is connected and fixed to the potentiometer shaft (81) of the potentiometer (8) by a locking screw D.

2. A test device for testing the tremor life of a non-wirewound precision potentiometer according to claim 1, characterized in that: The threaded column of the eccentric driving pin (4) is threadedly mounted with two limiting nuts (5), and a spring washer (6) is fitted between the two limiting nuts (5).

3. A test device for testing the tremor life of a non-wirewound precision potentiometer according to claim 1, characterized in that: The potentiometer fixing plate (9) is composed of a vertical plate and a horizontal plate and is in an "L" shape as a whole. The horizontal plate of the potentiometer fixing plate (9) is fixed to the top of the base (10) by a plurality of locking screws B. The potentiometer (8) is fixed to the vertical plate of the potentiometer fixing plate (9) by screws. The vertical plate of the potentiometer fixing plate (9) is provided with an axial hole that matches the potentiometer shaft (81).

4. A test device for testing the tremor life of a non-wirewound precision potentiometer according to claim 1, characterized in that: The motor (1) has a motor fixing plate (12), the motor fixing plate (12) of the motor (1) is fixed to the top of the motor fixing seat (2) by means of screws, and a positioning pin is provided between the motor fixing plate (12) and the top of the motor fixing seat (2).

5. A test device for testing the tremor life of a non-wirewound precision potentiometer according to claim 1, characterized in that: The motor shaft (11) of the motor (1) is plugged into the center of the eccentric wheel (3) and fixed by a locking screw C.

6. A test device for testing the tremor life of a non-wirewound precision potentiometer according to claim 1, characterized in that: The eccentric driving pin (4) and the rocker rod (7) are both made of GCr15 steel material.

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