Potentiometer contact pressure testing tool
By designing a potentiometer contact pressure testing fixture and utilizing a screw-fixed potentiometer housing with dual bearings and a fastening screw pump, the problem of inaccurate potentiometer contact pressure adjustment was solved, achieving higher testing accuracy.
Patent Information
- Application Number
- CN202423294485.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-30
AI Technical Summary
The contact pressure adjustment of existing potentiometers cannot be performed accurately, especially due to the fact that the first connection structure is blocked by the second connection structure and the central shaft tilts during rotation, which causes accuracy problems.
A potentiometer contact pressure testing fixture was designed, including a fixture housing and bearings. By limiting the swing angle of the center contact brush, the influence of gravity on the contact pressure value is reduced, ensuring that the contact pressure between the brush and the wire-wound resistor is not affected by the angle swing during rotation. The potentiometer housing under test is fixed by a double bearing structure and fastening screws.
This improves the accuracy of potentiometer contact pressure testing, ensuring that the contact pressure between the brush and the wire-wound resistor remains stable during rotation, thus avoiding test inaccuracies caused by central axis misalignment.
Smart Images
Figure CN223664145U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of potentiometer, specifically relates to a potentiometer contact pressure test frock. BACKGROUND
[0002] Potentiometer is used for contact pressure measurement and is widely used in instrument equipment such as aerospace.
[0003] The potentiometer needs to be debugged in contact pressure between the brush and the resistance wire before use, but the existing potentiometer is two-connection structure, and the brush of the first connection cannot be adjusted because it is shielded by the second connection structure.
[0004] If only the first connection structure is directly used, the central shaft is tilted in rotation, and the accuracy of contact pressure debugging is affected. INVENTION CONTENTS
[0005] The utility model provides a kind of potentiometer contact pressure test frock, solve the problem that prior art cannot accurately carry out contact pressure debugging.
[0006] The utility model provides a kind of potentiometer contact pressure test frock, comprising: frock shell and first bearing;
[0007] Frock shell is barrel-shaped, and installation boss is arranged in the center of bottom, first bearing is fixedly arranged in the center of installation boss, and the height of installation boss is less than the height of frock shell;
[0008] Frock shell is barrel-shaped, and installation boss is arranged in the center of bottom, first bearing is fixedly arranged in the center of installation boss, and the height of installation boss is less than the height of frock shell;
[0009] The central shaft of potentiometer is arranged in first bearing and second bearing, brush is connected on the central shaft of potentiometer, and the contact of brush contacts with wire-wound resistance.
[0010] Optionally, the potentiometer contact pressure test frock further comprises: a collar;
[0011] Ring groove is arranged in installation boss, and collar is arranged in ring groove;First bearing is arranged above collar.
[0012] Optionally, installation groove is arranged on the upper end surface of frock shell, and measured potentiometer shell is arranged in installation groove.
[0013] Optionally, a plurality of fixing holes are arranged around installation groove;
[0014] Fastening screw is arranged in fixing hole, and is used to fasten measured potentiometer shell.
[0015] Optionally, the number of fixing holes is four, and is evenly arranged around installation groove;
[0016] The preload of each fastening screw is consistent.
[0017] Optionally, the coaxiality of the inner and outer ring diameters of the mounting boss of the tooling housing is φ0.03, and the parallelism between the bottom of the mounting groove and the bottom of the tooling housing is 0.03.
[0018] This utility model provides a potentiometer contact pressure testing fixture, comprising: a fixture housing and a bearing; the fixture housing is barrel-shaped, with a mounting boss at the center of the bottom, and a first bearing fixedly mounted at the center of the mounting boss, the height of the mounting boss being less than the height of the fixture housing; a potentiometer housing to be tested is mounted above the fixture housing, a wire-wound resistor is mounted inside the potentiometer housing, and a second bearing is mounted in the central through hole of the potentiometer housing; the central shaft of the potentiometer passes through the first and second bearings, and a brush is connected to the central shaft of the potentiometer, with the brush contacts contacting the wire-wound resistor. This testing fixture improves the accuracy of the potentiometer contact pressure test value by limiting the swing angle of the central contact brush, reducing the influence of the brush's gravitational component on the contact pressure value. It ensures that the contact pressure between the brush and the wire-wound resistor coil is not affected by angular sway during one rotation of the brush, ensuring test accuracy. By controlling the dimensional tolerances of the mounting fit, the skewing angle of the rotation center is limited. This ensures that the contact pressure between the brush and the resistance wire is as unaffected as possible by the gravitational component when the central shaft sways. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the potentiometer contact pressure testing fixture.
[0020] Explanation of reference numerals in the attached figures:
[0021] 1-Central axis;
[0022] 2-Brush;
[0023] 3-Second bearing;
[0024] 4- Wire-wound resistor;
[0025] 5 - Potentiometer housing;
[0026] 6-Fastening screws;
[0027] 7-First bearing;
[0028] 8-Card Circle;
[0029] 9-Tool housing. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0031] The features and illustrative embodiments of various aspects of this utility model will now be described in detail. In the following detailed description, numerous specific details are set forth in order to provide a comprehensive understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it. This utility model is by no means limited to any specific arrangements and methods set forth below, but covers any improvements, substitutions, and modifications to the structure, method, and apparatus without departing from the spirit of this utility model. In the accompanying drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring this utility model.
[0032] It should be noted that, where there is no conflict, the embodiments of this utility model and the features therein can be combined with each other, and the various embodiments can be referenced and cited in turn. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.
[0033] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.
[0034] like Figure 1 This utility model provides a potentiometer contact pressure testing fixture, including: fixture housing 9 and first bearing 7;
[0035] The tooling housing 9 is barrel-shaped, with a mounting boss at the center of the bottom. A first bearing 7 is fixedly mounted at the center of the mounting boss, and the height of the mounting boss is less than the height of the tooling housing.
[0036] Above the tooling housing 9 is the potentiometer housing 5 to be measured, inside the potentiometer housing is a wire-wound resistor 4, and inside the central through hole of the potentiometer housing is a second bearing 3;
[0037] The potentiometer’s central shaft 1 is fitted with a first bearing and a second bearing. A brush 2 is connected to the central shaft of the potentiometer, and the brush contacts are in contact with the wire-wound resistor.
[0038] Optionally, the potentiometer contact pressure testing fixture also includes: a retaining ring 8;
[0039] The mounting boss is provided with a ring groove, and a clamping ring is clamped in the ring groove.
[0040] Optionally, a mounting groove is arranged on the upper end face of the tool shell, and the measured potentiometer shell is arranged in the mounting groove.
[0041] Optionally, a plurality of fixing holes are arranged in a circle of the mounting groove.
[0042] A fastening screw 6 is arranged in the fixing hole for fastening the measured potentiometer shell.
[0043] Optionally, the number of the fixing holes is four, and the fixing holes are uniformly arranged along the circle of the mounting groove.
[0044] The pre-tightening force of each fastening screw is consistent.
[0045] Optionally, the coaxiality of the inner and outer circles of the mounting boss of the tool shell is φ0.03, and the parallelism between the bottom of the mounting groove and the bottom of the tool shell is 0.03.
[0046] The working mode of the test tool is as follows: the center shaft 1, the brush 2, the second bearing 3, the wire-wound resistance 4 and the potentiometer shell 5 are assembled, that is, only the first connecting structure of the potentiometer is installed, the first connecting structure is installed on the tool shell 9, at this time, the center shaft 1 on the potentiometer assembly passes through the center of the first bearing 7 on the tool shell, and the radial swing of the center shaft is constrained due to the action of the double bearings.
[0047] The brush 2 is vertically and hard connected to the center shaft 1, and the contact pressure between the brush contact and the resistance wire is formed through the leaf spring on the back. When the center shaft is rotated, the brush contact slides on the wire-wound resistance, and the contact pressure exists in the whole circle at this time. By controlling the deflection angle of the center shaft when rotating, the contact pressure between the brush and the resistance in the whole circle can be ensured to be within a certain range, so that the inaccuracy of the contact pressure caused by the influence of the gravity component when the center shaft is inclined is avoided. The test accuracy is improved.
[0048] The above is only a specific embodiment of the utility model, which is used to describe the utility model in detail, and the part not described in detail is a conventional technology. However, the protection scope of the utility model is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. The protection scope of the utility model should be subject to the protection scope of the claims.
Claims
1. A potentiometer contact pressure testing fixture, characterized in that, include: Tool housing and first bearing; The tooling housing is barrel-shaped, with a mounting boss at the center of the bottom. A first bearing is fixedly mounted at the center of the mounting boss, and the height of the mounting boss is less than the height of the tooling housing. The housing of the potentiometer to be measured is set on the top of the tooling housing. A wire-wound resistor is set inside the housing of the potentiometer to be measured. A second bearing is set in the central through hole of the potentiometer housing. The potentiometer's central shaft is fitted with a first bearing and a second bearing. A brush is connected to the central shaft of the potentiometer, and the brush contacts are in contact with the wire-wound resistor.
2. The potentiometer contact pressure testing fixture according to claim 1, characterized in that, Also includes: Card circle; The mounting boss has an annular groove, and a retaining ring is fitted inside the annular groove; the first bearing is positioned above the retaining ring.
3. The potentiometer contact pressure testing fixture according to claim 1, characterized in that, The upper surface of the tooling housing is provided with a mounting groove, and the housing of the potentiometer to be measured is placed in the mounting groove.
4. The potentiometer contact pressure testing fixture according to claim 3, characterized in that, The mounting slot has multiple fixing holes around its circumference; A fastening screw is inserted into the fixing hole to fasten the housing of the potentiometer being measured.
5. The potentiometer contact pressure testing fixture according to claim 4, characterized in that, There are four fixing holes, which are evenly distributed around the mounting groove. The preload of each fastening screw is consistent.
6. The potentiometer contact pressure testing fixture according to claim 1, characterized in that, The coaxiality of the inner and outer ring diameters of the mounting boss on the tooling housing is φ0.03, and the parallelism between the bottom of the mounting groove and the bottom of the tooling housing is 0.03.