CN218546884U - Durable testing arrangement of potentiometre - Google Patents

Abstract

The utility model relates to a durable testing arrangement of potentiometre, characterized by: the potentiometer is driven to approach and leave the driving wheel by the movable mechanism; the testing device also comprises a driven wheel which is arranged at the end part of the rotating shaft of the potentiometer, and the driven wheel can be contacted with the driving wheel when the movable mechanism drives the driven wheel to be close to the driving wheel; the testing device also comprises a testing circuit used for detecting the resistance value of the potentiometer, and the testing circuit is used for being connected with the electrode of the potentiometer. The test device can automatically drive the rotating shaft of the potentiometer to rotate, and the traditional manual detection mode can be replaced by the test device, so that time and labor are saved, and the detection efficiency is higher; the error and the false detection of manual testing can be avoided, and the detection accuracy is higher.

Description

Durable testing arrangement of potentiometre

Technical Field

The utility model relates to an electronic components testing tool, concretely relates to durable testing arrangement of potentiometre.

Background

The potentiometer generally comprises an annular resistor body and a movable electric brush, and when a rotating shaft of the potentiometer is rotated, the contact position of the electric brush and the resistor body can be changed, so that a resistance value which is in a linear relation with the rotating angle of the rotating shaft is obtained at the output end of the potentiometer.

The quality of the potentiometer is tested before the potentiometer is shipped, wherein an important test item is a durability test and a linearity test of the potentiometer. The potentiometer is characterized in that the potentiometer is provided with a rotating shaft, a resistance value is tested after the potentiometer rotates for each time, the linearity of the potentiometer is calculated through a plurality of groups of rotating angles and resistance value data, the linearity calculated by detection is compared with a preset linearity value, whether the potentiometer is abraded or not is judged, when the potentiometer is abraded, the linearity can deviate from the set linearity, and the durability of the potentiometer is subjected to quality inspection through multiple rotation tests.

In the prior art, when the durability test is performed on the potentiometer, the rotating shaft of the potentiometer is manually rotated, and the resistance value of the potentiometer is detected through an instrument, so that the workload is high, the error is easy to occur, the time and the labor are wasted, the test efficiency is low, and the improvement is needed.

SUMMERY OF THE UTILITY MODEL

Based on the above expression, the utility model provides a potentiometre durability testing arrangement to solve the problem that artifical efficiency of software testing is low.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

a durability testing device for a potentiometer comprises a supporting plate and a motor, wherein the motor is fixedly connected with the supporting plate, a driving wheel is coaxially fixed at the end part of an output shaft of the motor, a movable mechanism for fixing the potentiometer is arranged on the supporting plate and positioned on the outer side of the output shaft of the motor, and the movable mechanism can drive the potentiometer to be close to or far away from the driving wheel; the testing device also comprises a driven wheel which is arranged at the end part of the rotating shaft of the potentiometer, and the driven wheel can be contacted with the driving wheel when the movable mechanism drives the driven wheel to be close to the driving wheel; the testing device also comprises a testing circuit used for detecting the resistance value of the potentiometer, and the testing circuit is used for being connected with the electrode of the potentiometer.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further: the movable mechanism comprises a swing arm and an elastic piece, one end of the swing arm is rotatably connected with the supporting disc, the other end of the swing arm is used for fixing the potentiometer, the elastic piece is abutted against the swing arm, and the elastic piece is used for driving the swing arm to swing towards the driving wheel.

Further: the free end of the swing arm is provided with a positioning hole, the positioning hole is used for allowing a flange on the main body of the potentiometer to enter, and the positioning hole is in interference fit with the flange.

Further: and the middle part of the driven wheel is provided with a shaft hole, and the shaft hole is in interference fit with a rotating shaft of the potentiometer.

And further: the test circuit comprises at least two detection cables, the end parts of the detection cables are connected with butt joints, and the butt joints are used for being in butt joint with electrodes of the potentiometers.

Further: the output shaft of the motor is provided with a convex block, the outer side of the output shaft is provided with a microswitch, a trigger part of the microswitch is positioned on a path of the convex block rotating along with the output shaft, and the output end of the microswitch is connected with the counter.

Further: the testing device further comprises a shell, the supporting plate is fixed with the shell, a status indicator lamp and a switch key are arranged on the supporting plate, the testing device further comprises a controller used for controlling the motor, and the status indicator lamp, the detection circuit and the switch key are respectively connected with the controller.

And further: the driving wheel and the driven wheel are both gears.

Further: the elastic piece is a torsion spring.

Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:

the testing device forms a power device through a motor, a gear, a swing arm and the like, can automatically drive a rotating shaft of the potentiometer to rotate, can replace a traditional manual detection mode by utilizing the testing device, is time-saving and labor-saving, and has higher detection efficiency; the error and the false detection of manual testing can be avoided, and the detection accuracy is higher.

Drawings

FIG. 1 is a schematic view of the overall structure of the testing apparatus in this embodiment;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a schematic structural view of the motor and the support plate in the embodiment;

FIG. 4 is a schematic diagram illustrating the connection between the swing arm and the potentiometer in the present embodiment;

FIG. 5 is an enlarged view of the portion B of FIG. 4;

fig. 6 is a schematic circuit diagram in the present embodiment.

In the drawings, the reference numbers indicate the following list of parts:

1. a housing; 2. switching a key; 3. a display screen; 4. a support disc; 5. a motor; 6. an output shaft; 7. A driving gear; 8. connecting columns; 9. swinging arms; 10. a torsion spring; 11. a driven gear; 12. a microswitch; 13. a bump; 14. detecting the cable; 15. a potentiometer; 1501. a main body; 1502. a rotating shaft; 1503. an electrode; 1504. a flange; 16. positioning holes; 17. butt joints; 18. a status indicator light; 19. And a power indicator lamp.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that spatial relationship terms, such as "under," "below," "beneath," "under," "above," "over," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. The "connection" in the following embodiments is understood as "electrical connection", "communication connection", or the like if the connected circuits, modules, units, or the like have electrical signals or data transmission therebetween.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Referring to fig. 1, 2 and 3, a durability testing device for a potentiometer comprises a supporting plate 4 and a motor 5, wherein a housing 1 of the motor 5 is fixedly connected with the supporting plate 4, an output shaft 6 of the motor 5 penetrates through the supporting plate 4 and can freely rotate, a driving gear 7 is coaxially fixed at the end of the output shaft 6 of the motor 5, a movable mechanism for fixing the potentiometer 15 is arranged on the supporting plate 4 and positioned on the outer side of the output shaft 6 of the motor 5, and the movable mechanism can drive the potentiometer 15 to be close to and far away from the driving gear 7; the testing device also comprises a driven gear 11 which is arranged at the end part of a rotating shaft 1502 of the potentiometer 15, after the driven gear 11 is arranged on the rotating shaft 1502 of the potentiometer 15, the driven gear 11 is driven to drive the rotating shaft 1502 to synchronously rotate, and when the movable mechanism drives the driven gear 11 to be close to the driving gear 7, the driven gear 11 can be meshed with the driving gear 7; the test apparatus further comprises a test circuit for detecting the resistance of the potentiometer 15.

The signal output terminal and the receiving terminal of the test circuit are respectively connected to the two sets of electrodes 1503 of the potentiometer 15.

The working principle of the testing device is as follows: moving the movable mechanism away from the driving gear 7, mounting the potentiometer 15 on the movable mechanism, and rotating the rotating shaft 1502 of the potentiometer 15 to center the potentiometer 15 (at this time, the rotating shaft 1502 of the potentiometer 15 can rotate in the same angle range in the clockwise direction and the anticlockwise direction, and the potentiometer 15 is in an initial state); the movable mechanism drives the potentiometer 15 to be close to the driving gear 7 until the driven gear 11 on the rotating shaft 1502 of the potentiometer 15 is meshed with the driving gear 7; and then, the motor 5 is powered on to enable the motor 5 to start to operate, the output shaft 6 of the motor 5 drives the driving gear 7 to synchronously rotate, the driving gear 7 drives the driven gear 11 to synchronously rotate, the rotating shaft 1502 of the potentiometer 15 starts to synchronously rotate, a voltage signal is output to one group of electrodes 1503 of the potentiometer 15 through the test circuit, the test circuit acquires a current signal output by the other group of electrodes 1503 of the potentiometer 15, and the current resistance value of the potentiometer 15 can be obtained through a resistance calculation formula.

The method comprises the steps of driving a rotating shaft 1502 of a potentiometer 15 to rotate clockwise and anticlockwise by controlling forward rotation and reverse rotation of a motor 5, detecting the current resistance value of the potentiometer 15 when the rotating shaft 1502 rotates to a specific angle (namely, a detection angle, the motor 5 can adopt a stepping motor 5, calculating the number of pulses sent to the stepping motor 5 by a controller of the motor 5 by combining with the step of the stepping motor 5 to calculate the rotating angle of the stepping motor 5, namely, the rotating angle of the rotating shaft 1502 of the potentiometer 15, detecting the current resistance value of the potentiometer 15, obtaining corresponding data (the resistance value should be linearly changed along with the rotating angle) of the rotating angle and the resistance value of the potentiometer 15 after carrying out a plurality of groups of tests, calculating the linearity value (resistance value uniformity of the potentiometer 15) of the measured potentiometer 15 through each group of corresponding data, comparing the linearity value of the potentiometer 15 obtained by detection with the set linearity value, and indicating that the potentiometer 15 is greatly worn if the linearity value of the potentiometer 15 is lower than the set value (0.5%), and the potentiometer 15 does not pass the test.

The testing device can replace the traditional manual detection mode, saves time and labor and has higher detection efficiency; the error and the false detection of manual testing can be avoided, and the detection accuracy is higher.

In this embodiment, the movable mechanism includes spliced pole 8 and swing arm 9, spliced pole 8 perpendicular to supporting disk 4, the lower extreme of spliced pole 8 is connected fixedly with supporting disk 4, swing arm 9 is on a parallel with supporting disk 4 and swing arm 9 is towards driving gear 7, the rear end of swing arm 9 is rotated with the upper end of spliced pole 8 and is connected, the front end of swing arm 9 is used for fixed potentiometre 15, the cover is equipped with torsional spring 10 on spliced pole 8, the one end of torsional spring 10 is fixed with spliced pole 8, the other end and the swing arm 9 contact of torsional spring 10, torsional spring 10 is used for driving swing arm 9 and swings towards driving gear 7.

Before testing, the swing arm 9 is broken by hand to enable the free end of the swing arm 9 to swing outwards, and the torsion spring 10 deforms to store force in the process; then, a potentiometer 15 is fixedly arranged at the free end of the swing arm 9, and a driven gear 11 is arranged at the upper end of a rotating shaft 1502 of the potentiometer 15, so that the driven gear 11 and the driving gear 7 are basically positioned at the same height; and then slowly releasing the swing arm 9 until the driven gear 11 is meshed with the driving gear 7, wherein the elastic force of the torsion spring 10 acts on the swing arm 9 in the state, so that the free end of the swing arm 9 has pressure on the potentiometer 15, and the pressure is transmitted to the driven gear 11 to stably and reliably maintain the driven gear 11 in a meshed state with the driving gear 7.

After the test is finished, the swing arm 9 is pulled outward again by hand, and the potentiometer 15 which has finished the test is taken off from the free end of the swing arm 9.

The movable mechanism in this embodiment can make the operation of dismouting potentiometre 15 more convenient, and can guarantee the reliability of driven gear 11 and driving gear 7 meshing.

In other embodiments, the movable mechanism may be in other forms, for example, a bent elastic sheet is adopted, one end of the elastic sheet is fixedly connected to the support plate 4, the potentiometer 15 is fixed to the other end of the elastic sheet, and the driven gear 11 and the driving gear 7 are maintained in a meshed state by the elastic force of the elastic sheet; the slider may be slidably connected to the support plate 4, the slider may be slidable in a direction toward and away from the driving gear 7, the potentiometer 15 may be fixed to an end of the slider, the driven gear 11 may be engaged with the driving gear 7 by sliding the slider, and the driven gear 11 may be held in an engaged state with the driving gear 7 by a sliding frictional resistance of the slider.

In other embodiments, a driving wheel and a driven wheel with rough circumferential surfaces can be used instead of the driving gear 7 and the driven gear 11 in the present embodiment, and the driving wheel and the driven wheel transmit power through friction force generated by contact.

Referring to fig. 3, 4 and 5, in this embodiment, a positioning hole 16 is provided at the free end of the swing arm 9, the positioning hole 16 is used for allowing a flange 1504 on a main body 1501 of the potentiometer 15 to enter (an annular flange 1504 is generally designed at a joint of a rotating shaft 1502 of the conventional potentiometer 15 and the main body 1501, the flange 1504 and the main body 1501 are of an integral structure), the positioning hole 16 is in interference fit with the flange 1504, an axial hole (not shown) is formed in the middle of the driven gear 11, and the axial hole is in interference fit with the rotating shaft 1502 of the potentiometer 15, when the potentiometer 15 is installed, the potentiometer 15 is first placed under the positioning hole 16, then the potentiometer 15 is moved from bottom to top, so that the rotating shaft 1502 of the potentiometer 15 passes through the positioning hole 16 until the flange 1504 on the main body 1501 is clamped into the positioning hole 16, i.e. the potentiometer 15 can be fixed at the free end of the swing arm 9, and then the driven gear 11 is sleeved on the rotating shaft 1502, i.e. the fixing of the potentiometer 15 can be completed.

Referring to fig. 1 and 2, the test circuit in this embodiment includes at least two detection cables 14, the detection cables 14 are used to connect a signal sending circuit and a signal receiving circuit (i.e., a detection circuit), the end of the detection cables 14 is connected with a butt joint 17, and the butt joint 17 is used to be butted with the electrode 1503 of the potentiometer 15, so that the structure can realize quick connection and disconnection between the detection cables 14 and the potentiometer 15, and improve the operation efficiency.

In this embodiment, a protrusion 13 is disposed on the output shaft 6 of the motor 5, a micro switch 12 is disposed outside the output shaft 6, the micro switch 12 is fixed to the support plate 4, a trigger portion of the micro switch 12 is located on a path where the protrusion 13 rotates along with the output shaft 6, and the protrusion 13 contacts with the micro switch 12 during the rotation of the output shaft 6, so that the micro switch 12 is triggered.

The testing device further comprises a shell 1, an opening (not shown) is formed in the shell 1, the motor 5 penetrates through the opening and is hidden below the shell 1, a supporting plate 4 covers the opening and is fixed with the shell 1, and a status indicator lamp 18, a power indicator lamp 19, a switch key 2 and a display screen 3 are arranged on the supporting plate 4.

Referring to fig. 6, the testing device further includes a controller, the controller in this embodiment includes an MCU module, a motor 5 driving module and a power module, an input end of the motor 5 driving module is connected with an output end of the MCU module, a driving signal output end of the motor 5 driving module is connected with a control end of the motor 5, a signal output end of the microswitch 12 is connected with a sampling end of the MCU module, and the display screen 3, the detection circuit, the switch key 2, the status indicator lamp 18 and the power indicator lamp 19 are respectively connected with each I/O end of the MCU module.

After the potentiometer 15 is installed and wired, the power indicator 19 is turned on after the testing device is powered on, and the test is started by pressing the switch button 2.

The MCU module is integrated with a counter, after the test is started, the MCU module controls the motor 5 to drive the module to drive the motor 5 to rotate, and when the motor 5 rotates to a certain angle (namely the detection angle of the potentiometer 15), a voltage signal is sent to the potentiometer 15 through the detection circuit, and a current signal output by the potentiometer 15 is collected, so that the current resistance value of the potentiometer 15 is obtained through calculation. In the process, the output shaft 6 of the motor 5 can enable the bump 13 to trigger the microswitch 12 in the rotating process, the microswitch 12 can feed back a level jump signal to the MCU each time the microswitch is triggered, the MCU module counts once every time the MCU module receives the level jump signal, and when the counting reaches five times (namely five times of detection), the MCU module sends a pulse signal to the status indicator lamp 18 to enable the status indicator lamp 18 to flash rapidly, so that the test is prompted to be completed.

During the test, the display screen 3 can display the current resistance value of the potentiometer 15 and the state information of the test device.

The status indicator light 18 has another function of: when the potentiometer 15 is centered, the potentiometer 15 is wired to test the resistance value, for example, the potentiometer 15 with 0K to 1K ohms rotates the rotating shaft 1502 of the potentiometer 15, and when the resistance value of the potentiometer 15 is 500 ohms, the MCU module outputs a high level signal to the status indicator light 18 to turn on the status indicator light 18 to indicate that the centering operation is completed, and at this time, the midpoint of the resistance value of the potentiometer 15 is found.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (9)

1. A durable testing arrangement of potentiometre, characterized by: the potentiometer is characterized by comprising a supporting plate and a motor, wherein the motor is fixedly connected with the supporting plate, a driving wheel is coaxially fixed at the end part of an output shaft of the motor, a movable mechanism for fixing the potentiometer is arranged on the supporting plate and positioned on the outer side of the output shaft of the motor, and the movable mechanism can drive the potentiometer to be close to or far away from the driving wheel; the testing device also comprises a driven wheel which is arranged at the end part of the rotating shaft of the potentiometer, and the driven wheel can be contacted with the driving wheel when the movable mechanism drives the driven wheel to be close to the driving wheel; the testing device also comprises a testing circuit used for detecting the resistance value of the potentiometer, and the testing circuit is used for being connected with the electrode of the potentiometer.

2. A potentiometer durability testing device according to claim 1, wherein: the movable mechanism comprises a swing arm and an elastic piece, one end of the swing arm is rotatably connected with the supporting disc, the other end of the swing arm is used for fixing the potentiometer, the elastic piece is abutted against the swing arm, and the elastic piece is used for driving the swing arm to swing towards the driving wheel.

3. A potentiometer durability testing apparatus according to claim 2, wherein: the free end of the swing arm is provided with a positioning hole, the positioning hole is used for allowing a flange on the main body of the potentiometer to enter, and the positioning hole is in interference fit with the flange.

4. A potentiometer durability testing apparatus according to claim 1, wherein: and the middle part of the driven wheel is provided with a shaft hole, and the shaft hole is in interference fit with a rotating shaft of the potentiometer.

5. A potentiometer durability testing device according to claim 1, wherein: the testing circuit comprises at least two detection cables, the end parts of the detection cables are connected with butt joints, and the butt joints are used for being in butt joint with electrodes of the potentiometer.

6. A potentiometer durability testing apparatus according to claim 1, wherein: the output shaft of the motor is provided with a convex block, the outer side of the output shaft is provided with a microswitch, a trigger part of the microswitch is positioned on a path of the convex block rotating along with the output shaft, and the output end of the microswitch is connected with the counter.

7. A potentiometer durability testing device according to claim 1, wherein: the testing device further comprises a shell, the supporting plate is fixed with the shell, a state indicator lamp and a switch key are arranged on the supporting plate, the testing device further comprises a controller used for controlling the motor, and the state indicator lamp, the detection circuit and the switch key are respectively connected with the controller.

8. A potentiometer durability testing apparatus according to claim 1, wherein: the driving wheel and the driven wheel are both gears.

9. A potentiometer durability testing device according to claim 2, wherein: the elastic piece is a torsion spring.

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