Measuring device for measuring the starting friction torque of a gimbal, working method

Abstract

The application relates to the technical field of measuring equipment, in particular to a measuring device for measuring the starting friction torque of a universal support, which comprises a base, a rotating structure arranged on the base, a frame arranged on the rotating structure, and a to-be-measured piece arranged on the frame; a measuring tool arranged on the to-be-measured piece, a first magnetic piece arranged on the measuring tool, and a correction hole arranged on the measuring tool; a mounting frame arranged on the base, a correction mechanism arranged on the mounting frame, the correction mechanism comprising a correction shaft matched with the correction hole and used for resetting the measuring tool; and two driving loading mechanisms arranged on the mounting frame, the end of each driving loading mechanism being provided with a second magnetic piece and a detection element, the driving loading mechanism driving the second magnetic piece to do reciprocating motion on the mounting frame and approach the measuring tool. The measuring device for measuring the starting friction torque of the micro rolling bearing of the universal support has the advantages of high measuring precision, good repeatability of the measuring result and high automation degree.

Description

Technical Field

[0001] This invention relates to the field of measuring equipment technology, specifically to a measuring device and its working method for measuring the starting friction torque of a universal joint bracket. Background Technology

[0002] In inertial navigation and guidance systems, gyroscopes are crucial sensitive components. In frame-type gyroscopes, the gimbal is a key component, with its inner and outer rings connected by bearings, allowing for relative rotation around an axis. The initial frictional torque during this relative rotation significantly impacts guidance accuracy. To meet the accuracy requirements of inertial navigation and guidance systems, it is necessary to test this frictional torque.

[0003] Existing friction torque testers are mainly used in the testing of individual bearing products. Research on the measurement technology of starting friction torque of miniature rolling bearings is far from sufficient. Furthermore, the problems of loading difficulties and large measurement errors in the study of starting friction torque of rotating shaft assemblies supported by miniature bearings have not yet been effectively solved. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems of difficulty in loading and large measurement error in the friction torque test of the rotary shaft assembly in the prior art, thereby providing a measuring device and working method for measuring the starting friction torque of the universal bracket.

[0005] To address the aforementioned technical problems, this invention provides a measuring device for measuring the starting friction torque of a universal joint bracket, comprising: a base with a rotating structure and a frame on the rotating structure, the frame having a component to be measured; a measuring fixture disposed on the component to be measured, the measuring fixture having a first magnetic component and a calibration hole; a mounting frame disposed on the base, the mounting frame having a calibration mechanism, the calibration mechanism including a calibration shaft that engages with the calibration hole for resetting the measuring fixture; and two drive loading mechanisms disposed on the mounting frame, the ends of the drive loading mechanisms having a second magnetic component and a detection element, the drive loading mechanisms driving the second magnetic component to reciprocate on the mounting frame and move closer to the measuring fixture.

[0006] In some embodiments, the rotating structure includes: a support frame disposed on the base; a first rotating shaft and a second rotating shaft, both disposed on the support frame; the frame is disposed on the first rotating shaft and the second rotating shaft; and the first rotating shaft and the second rotating shaft are coaxially arranged.

[0007] In some embodiments, the rotating structure further includes a bearing housing disposed on the support frame, and the first rotating shaft and the second rotating shaft are disposed on the support frame.

[0008] In some embodiments, the adjustment structure includes: an expansion sleeve connected to the first rotating shaft, the expansion sleeve having a positioning disk and a plurality of grooves on the outer wall of the positioning disk; and a fixing block disposed on the support frame, the fixing block having a fixing pin, the fixing pin being disposed corresponding to the grooves.

[0009] In some embodiments, there is an angular difference of 10° between two adjacent grooves.

[0010] In some embodiments, the calibration mechanism includes: a calibration drive member connected to a calibration sliding platform; and a support base disposed on the calibration sliding platform, with the calibration shaft disposed on the support base.

[0011] In some embodiments, the driving loading mechanism includes: a loading sliding platform, which is disposed on a mounting frame and has a loading driving element at one end; a mounting base, which is disposed on the loading sliding platform; a loading rod, which is disposed on the mounting base, a second magnetic element is disposed on the loading rod, and a detection element is disposed at the free end of the loading rod.

[0012] In some embodiments, the second magnetic element includes: a copper sleeve disposed at the input end of the detection element; and a permanent magnet disposed inside the copper sleeve.

[0013] In some embodiments, a positioning structure is further included, the positioning structure comprising: a positioning screw disposed at the top of the frame for connecting the workpiece to be measured and the frame; and a spring pin and a positioning pin disposed at the bottom of the frame for fixing the workpiece to be measured.

[0014] The present invention also provides a method for operating a measuring device for measuring the starting friction torque of a universal bracket, comprising: setting a workpiece to be measured on a frame, setting a measuring fixture on the workpiece to be measured, using a calibration shaft on a calibration mechanism to cooperate with a calibration hole on the measuring fixture to calibrate the position of the measuring fixture, then using a second magnetic component on a drive loading mechanism to reciprocate relative to a first magnetic component on the measuring fixture, and using a detection element to detect the maximum static friction force of the workpiece to be measured in the rotation direction, thereby calculating the starting friction torque value in the rotation direction.

[0015] The technical solution of this invention has the following advantages:

[0016] 1. The present invention provides a measuring device for measuring the starting friction torque of a universal bracket, comprising: a base, wherein a rotating structure is provided on the base, and a frame is provided on the rotating structure, and a component to be measured is provided on the frame; a measuring fixture is provided on the component to be measured, wherein a first magnetic component is provided on the measuring fixture, and a calibration hole is provided on the measuring fixture; a mounting frame is provided on the base, and a calibration mechanism is provided on the mounting frame, wherein the calibration mechanism includes a calibration shaft, the calibration shaft cooperating with the calibration hole for resetting the measuring fixture; and two driving loading mechanisms are provided on the mounting frame, wherein a second magnetic component and a detection element are provided at the end of the driving loading mechanism, and the driving loading mechanism drives the second magnetic component to reciprocate on the mounting frame and move closer to the measuring fixture.

[0017] By setting a rotating structure on the base and a frame on the rotating structure, a workpiece to be measured is placed inside the frame, and a measuring fixture is set inside the workpiece. The frame is used to clamp and position the workpiece, ensuring the stability of the workpiece installation and enabling the measurement of the starting friction torque in two rotational directions of the workpiece. At the same time, the rotating structure increases the initial measurement position of the workpiece and the measuring fixture in the same rotational direction, that is, it enables the workpiece to be measured in different starting positions within the range of -30° to 30°.

[0018] Furthermore, the measuring fixture can be calibrated by a calibration mechanism. This involves the calibration shaft of the calibration mechanism engaging with the calibration hole of the measuring fixture to achieve calibration and reset. Then, a drive loading mechanism moves the second magnetic component on the mounting structure, bringing it close to the first magnetic component on the measuring fixture. The second and first magnetic components generate a repulsive force. When this repulsive force exceeds the maximum static friction force in the rotational direction of the workpiece, a detection element measures the maximum static friction force of the workpiece, thereby calculating the starting friction torque.

[0019] This measuring device for the starting friction torque of a universal joint has advantages such as high measurement accuracy, good repeatability of measurement results, and high degree of automation. It can measure the starting friction torque value of the universal joint in the rotation direction.

[0020] This device for measuring the starting friction torque of a universal joint can measure the starting friction torque of the support bearing at the rotation center of the workpiece under test in different initial positions (-30° to 30°). It can also achieve slow loading of a small force to ensure that the detection element can collect the maximum static friction force in the rotation direction of the joint, thereby calculating the starting friction torque value at that position. Furthermore, it can achieve tooling reset after unidirectional measurement, ensuring the continuity of multiple measurements.

[0021] 2. The present invention provides a measuring device for measuring the starting friction torque of a universal joint bracket. The rotating structure includes: a support frame mounted on a base; a first rotating shaft and a second rotating shaft, both mounted on the support frame; and a frame mounted on the first and second rotating shafts, with the first and second rotating shafts coaxially arranged. By mounting the support frame on the base, and providing a mounting position for the frame; and by connecting the first and second rotating shafts to the support frame, the angle of the frame can be adjusted via the first and second rotating shafts, thereby measuring the starting friction torque value of the component under test at different angles.

[0022] 3. The measuring device for measuring the starting friction torque of a universal bracket provided by the present invention further includes a bearing housing on the support frame, wherein the first rotating shaft and the second rotating shaft are disposed on the support frame. The bearing housing contains a bearing, wherein one end of the first rotating shaft and the second rotating shaft passes through the bearing and is inserted into the bearing housing. This arrangement effectively reduces the frictional resistance between the bearing housing and the first and second rotating shafts, making the rotation of the frame smoother.

[0023] The summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed description below. The summary section is not intended to identify essential or indispensable features of this disclosure, nor is it intended to limit the scope of this disclosure. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of the measuring device for measuring the starting friction torque of a universal joint bracket provided by the present invention;

[0026] Figure 2 A side view of the measuring device for measuring the starting friction torque of a universal joint bracket provided by the present invention;

[0027] Figure 3 A schematic diagram of the rotating structure of the measuring device for measuring the starting friction torque of a universal bracket provided by the present invention;

[0028] Figure 4A bottom view of the support frame of the measuring device for measuring the starting friction torque of a universal bracket provided by the present invention;

[0029] Figure 5 A schematic diagram of the positioning disk of the measuring device for measuring the starting friction torque of a universal bracket provided by the present invention;

[0030] Figure 6 A schematic diagram of the mounting frame of the measuring device for measuring the starting friction torque of a universal joint bracket provided by the present invention;

[0031] Figure 7 A schematic diagram of the calibration mechanism of the measuring device for measuring the starting friction torque of a universal bracket provided by the present invention;

[0032] Figure 8 A side view of the calibration mechanism of the measuring device for measuring the starting friction torque of a universal bracket provided by the present invention;

[0033] Figure 9 This is a side view of the drive loading mechanism of the measuring device for measuring the starting friction torque of a universal bracket provided by the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Base; 2. Rotating structure; 3. Frame; 4. Measured part; 5. Measuring fixture; 6. First magnetic component; 7. Calibration hole; 8. Mounting frame; 9. Calibration mechanism; 10. Calibration shaft; 11. Drive loading mechanism; 12. Second magnetic component; 13. Detection element; 14. Support frame; 15. First rotating shaft; 16. Second rotating shaft; 17. Bearing seat; 18. Expansion sleeve; 19. Positioning plate; 20. Groove; 21. Fixing block; 22. Fixing pin; 23. Calibration drive component; 24. Calibration sliding platform; 25. Support base; 26. Loading sliding platform; 27. Loading drive component; 28. Mounting base; 29. ​​Loading rod; 30. Permanent magnet; 31. Positioning screw; 32. Spring pin; 33. Positioning pin; 34. Base; 35. Side cover plate; 36. Top cover plate. Detailed Implementation

[0036] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure. Therefore, the drawings and description are to be considered exemplary in nature and not restrictive.

[0037] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or connections that allow for communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0039] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] The following disclosure provides numerous different embodiments or examples for implementing various structures of this disclosure. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this disclosure. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this disclosure, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0041] The preferred embodiments of this disclosure are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0042] Please see Figures 1 to 9 As shown, the present invention provides a measuring device for measuring the starting friction torque of a universal bracket, comprising: a base 1, wherein a rotating structure 2 is provided on the base 1, and a frame 3 is provided on the rotating structure 2, and a part to be measured 4 is provided on the frame 3; a measuring fixture 5 is provided on the part to be measured 4, wherein a first magnetic element 6 is provided on the measuring fixture 5, and a calibration hole 7 is provided on the measuring fixture 5; a mounting frame 8 is provided on the base 1, and a calibration mechanism 9 is provided on the mounting frame 8, wherein the calibration mechanism 9 includes a calibration shaft 10, the calibration shaft 10 cooperating with the calibration hole 7 for resetting the measuring fixture 5; and a driving loading mechanism 11, having two components, provided on the mounting frame 8, wherein the end of the driving loading mechanism 11 is provided with a second magnetic element 12 and a detection element 13, and the driving loading mechanism 11 drives the second magnetic element 12 to reciprocate on the mounting frame 83 and approach the measuring fixture 5.

[0043] By setting a rotating structure 2 on the base 1, and a frame 3 on the rotating structure 2, a part to be measured 4 is placed inside the frame 3, and a measuring fixture 5 is set inside the part to be measured 4. That is, the frame 3 is used to clamp and position the part to be measured 4, which ensures the stability of the installation of the part to be measured 4, and can realize the measurement of the starting friction torque of the part to be measured 4 in two rotation directions on the same rotating axis. At the same time, the setting of the rotating structure 2 can increase the initial measurement position of the part to be measured 4 and the measuring fixture 5 in the same rotation direction, that is, the part to be measured 4 can be measured in different starting positions within the range of -30° to 30°.

[0044] Furthermore, the measuring fixture 5 can be calibrated by the calibration mechanism 9, that is, by using the calibration shaft 10 of the calibration mechanism 9 to cooperate with the calibration hole 7 of the measuring fixture 5, thereby realizing the calibration and reset of the measuring fixture 5. Then, the driving loading mechanism 11 drives the second magnetic component 12 to move on the mounting structure, so that the second magnetic component 12 is close to the first magnetic component 6 on the measuring fixture 5. The second magnetic component 12 and the first magnetic component 6 generate a repulsive force. When the generated repulsive force is greater than the maximum static friction force in the rotation direction of the part to be measured 4, the detection element 13 measures the maximum static friction force in the rotation direction, thereby calculating the starting friction torque.

[0045] This measuring device for the starting friction torque of a universal joint has advantages such as high measurement accuracy, good repeatability of measurement results, and high degree of automation. It can measure the starting friction torque value of the universal joint in the rotation direction.

[0046] The measuring device for the starting friction torque of the universal joint bracket can measure the starting friction torque of the support bearing at the rotation center of the measured part 4 at different initial positions (-30° to 30°); the measuring device for the starting friction torque of the universal joint bracket can achieve slow loading of a small force to ensure that the detection element 13 can collect the maximum static friction force in the rotation direction of the measured part 4, thereby calculating the starting friction torque value at that position; the measuring device for the starting friction torque of the universal joint bracket can achieve the function of tooling reset after unidirectional measurement to ensure the continuity of multiple measurements.

[0047] In some optional embodiments, the rotating structure 2 includes: a support frame 14 disposed on the base 1; a first rotating shaft 15 and a second rotating shaft 16, both disposed on the support frame 14; and a frame 3 disposed on the first rotating shaft 15 and the second rotating shaft 16, wherein the first rotating shaft 15 and the second rotating shaft 16 are coaxially arranged.

[0048] By setting the support frame 14 on the base 1, the support frame 14 provides an installation position for the frame 3; at the same time, the first rotating shaft 15 and the second rotating shaft 16 are set on the support frame 14, and the frame 3 is connected to the first rotating shaft 15 and the second rotating shaft 16. Therefore, the angle of the frame 3 can be adjusted by the first rotating shaft 15 and the second rotating shaft 16, thereby measuring the starting friction torque value of the workpiece 4 under different angles.

[0049] In some optional embodiments, the rotating structure 2 further includes a bearing seat 17 disposed on the support frame 14, and the first rotating shaft 15 and the second rotating shaft 16 are disposed on the support frame 14.

[0050] The bearing housing 17 is equipped with a bearing, with one end of the first rotating shaft 15 and the second rotating shaft 16 passing through the bearing and inserted into the bearing housing 17. This arrangement can effectively reduce the frictional resistance between the bearing housing 17 and the first rotating shaft 15 and the second rotating shaft 16, making the rotation of the frame 3 smoother.

[0051] In some optional embodiments, the locking structure includes: an expansion sleeve 18 connected to the first rotating shaft 15, the expansion sleeve 18 having a positioning disk 19 and a plurality of grooves 20 on the outer wall of the positioning disk 19; and a fixing block 21 disposed on the support frame 14, the fixing block 21 having a fixing pin 22, the fixing pin 22 being disposed corresponding to the grooves 20.

[0052] The expansion sleeve 18 connects the first rotating shaft 15 to the positioning disk 19. Meanwhile, the groove 20 on the outer wall of the positioning disk 19 can cooperate with the fixing pin 22 to lock the rotating positioning disk 19. The position of the frame 3 and the workpiece 4 to be measured can be adjusted by limiting the rotation position of the positioning disk 19.

[0053] In this embodiment, there is an angular difference of 10° between two adjacent grooves 20.

[0054] In some optional embodiments, the correction mechanism 9 includes: a correction drive 23 connected to the correction sliding platform 24; a support 25 disposed on the correction sliding platform 24, and the correction shaft 10 disposed on the support 25.

[0055] The calibration drive 23 is bolted onto the side cover plate 35, which provides an installation position for the calibration drive 23 and ensures the installation stability of the calibration drive 23. At the same time, the calibration sliding platform 24 is connected to one end of the calibration drive 23. The calibration drive 23 drives the support base 25 to perform reciprocating linear motion through the calibration sliding platform 24, so that the calibration shaft 10 on the support base 25 cooperates with the calibration hole 7 on the measuring fixture 5, thereby completing the reset of the measuring fixture 5 and the part to be measured 4.

[0056] The calibration drive 23 is connected to the lead screw in the calibration sliding platform 24 via a coupling. The support base 25 is fixed to the nut in the calibration sliding platform 24. The calibration shaft 10 is tightly connected to the support base 25 via a thread. The measuring fixture 5 is symmetrically distributed on its side at the top and bottom from the rotation center, with two permanent magnets 30 serving as force loading points. After completing one starting friction torque measurement on one of the rotating shafts of the test piece, the measuring fixture 5 will deflect at a small angle around its rotation center. At this time, the calibration drive 23 rotates, driving the calibration shaft 10 to reciprocate through the calibration sliding platform 24. The calibration shaft 10 gradually forms a clearance fit with the calibration hole 7 in the measuring fixture 5, allowing the measuring fixture 5 to return to its initial position.

[0057] In some optional embodiments, the drive loading mechanism 11 includes: a loading sliding platform 26, which is disposed on the mounting frame 83 and has a loading drive component 27 at one end; a mounting base 28, which is disposed on the loading sliding platform 26; a loading rod 29, which is disposed on the mounting base 28, a second magnetic component 12 is disposed on the loading rod 29, and a detection element 13 is disposed at the free end of the loading rod 29.

[0058] By mounting the loading sliding platform 26 on the top cover plate 36 and the base 34, the loading sliding platform 26 and the mounting frame 8 are integrated, ensuring the stability of the installation of the drive loading mechanism 11. Simultaneously, the loading sliding platform 26 is bolted to the mounting frame 8. The loading drive component 27 drives the support seat 28 on the loading sliding platform 26 to reciprocate on the mounting frame 8, thus realizing the reciprocating motion of the loading rod 29. The second magnetic component 12 on the free end of the loading rod 29 generates a repulsive force with the first magnetic component 6, applying a force load to the measuring fixture 5. The starting friction torque of the measured component 4 is then measured using the detection element 13.

[0059] The loading drive unit 27 is connected to the lead screw inside the loading sliding platform 26 via a coupling. The loading mounting base 28 is fixedly connected to the nut of the loading sliding platform 26. The loading rod 29 is threadedly connected to the mounting base 28. The fixed end of the detection element 13 is threadedly connected to the loading rod 29, and the input end of the detection element 13 is threadedly connected to the copper sleeve. The permanent magnet 30 is embedded in the copper sleeve. The loading drive unit 27 drives the lead screw of the loading sliding platform 26 to rotate, thereby causing the loading rod 29 to perform linear reciprocating motion. This causes the permanent magnet 30 at the input end of the detection element 13 and the permanent magnet 30 on the test fixture to generate a repulsive force, completing the process of applying force to the test piece.

[0060] In some alternative embodiments, the second magnetic element 12 includes a copper sleeve disposed at the input end of the detection element 13; and a permanent magnet 30 disposed inside the copper sleeve.

[0061] That is, a copper sleeve is provided on the input end of the detection element 13, and the permanent magnet 30 is placed inside the copper sleeve, that is, the copper sleeve is used to position and install the permanent magnet 30.

[0062] Among them, the detection element 13 is a force sensor; the correction drive 23 and the loading drive 27 are both motors.

[0063] In some optional embodiments, the mounting frame 8 includes: a base 34, with side cover plates 35 on both sides of the base 34; and a top cover plate 36, which is disposed on the side cover plates 35 and located at one end of the side cover plates 35. That is, the mounting frame 8 is formed by the base 34, the two side cover plates 35, and the top cover plate 36. Simultaneously, a correction mechanism 9 is fixed to the two side cover plates 35, and a drive loading mechanism 11 is fixed to the top cover plate 36 and the base 34.

[0064] In some optional embodiments, the measuring device for measuring the starting friction torque of the universal bracket further includes a positioning structure, which includes: a positioning screw 31, located at the top of the frame 3, for fixing the part to be measured 4 and the frame 3; a spring pin 32 and a positioning pin 33, located at the bottom of the frame 3, the spring pin 32 and the positioning pin 33 fixing the part to be measured 4.

[0065] The positioning screw 31, spring pin 32, and positioning pin 33 facilitate the installation of the part to be measured 4 on the frame 3. At the same time, the height of the part to be measured 4 can be adjusted according to the position of the positioning screw 31, spring pin 32, and positioning pin 33 on the frame 3.

[0066] The present invention also provides a method for operating a measuring device for measuring the starting friction torque of a universal bracket, comprising: setting a component 4 to be measured on a frame 3, setting a measuring fixture 5 on the component 4 to be measured, using a calibration shaft 10 on a calibration mechanism 9 to cooperate with a calibration hole 7 on the measuring fixture 5 to calibrate the position of the measuring fixture 5, then using a second magnetic component 12 on a drive loading mechanism 11 to reciprocate relative to a first magnetic component 6 on the measuring fixture 5, and using a detection element 13 to detect the maximum static friction force of the component 4 in its rotation direction, thereby calculating the starting friction torque value in the rotation direction.

[0067] The specific working method of the measuring device for measuring the starting friction torque of the universal bracket is as follows: First, the measuring fixture 5 is installed on the part to be measured 4. The part to be measured 4 is installed on the frame 3 by the positioning screw 31, the spring pin 32, and the positioning pin 33. The calibration drive 23 drives the calibration sliding platform to move, and the calibration sliding platform drives the support 25 to reciprocate, so that the calibration shaft 10 on the support 25 cooperates with the calibration hole 7 on the measuring fixture 5, that is, the resetting of the measuring fixture 5 and the part to be measured 4 is completed.

[0068] The loading rod 29 is reciprocated by the loading sliding platform 26 through the loading drive structure. The second magnetic element 12 on the free end of the loading rod 29 generates a repulsive force with the first magnetic element 6, which drives the measuring fixture 5 to rotate. The maximum static friction force of the measured part 4 when it rotates is measured by the detection element 13, and then the starting friction torque value is calculated. The position of the measuring fixture 5 is then corrected by the calibration mechanism 9, and then the measurement is performed by the drive loading on the other side, thus completing one measurement.

[0069] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A measuring device for measuring the starting friction torque of a universal joint bracket, characterized in that, include: A base (1) is provided on the base (1), a rotating structure (2) is provided on the base (1), and a frame (3) is provided on the rotating structure (2), and a part to be measured (4) is provided on the frame (3); A measuring fixture (5) is provided on the workpiece (4) to be measured. A first magnetic component (6) is provided on the measuring fixture (5), and a calibration hole (7) is provided on the measuring fixture (5). The mounting frame (8) is mounted on the base (1), and a calibration mechanism (9) is provided on the mounting frame (8). The calibration mechanism (9) includes a calibration shaft (10), which cooperates with the calibration hole (7) to reset the measuring fixture (5). Two drive loading mechanisms (11) are provided on the mounting frame (8). The end of the drive loading mechanism (11) is provided with a second magnetic element (12) and a detection element (13). The drive loading mechanism (11) drives the second magnetic element (12) to reciprocate on the mounting frame (8) and approach the measuring fixture (5).

2. The measuring device for measuring the starting friction torque of a universal joint bracket according to claim 1, characterized in that, The rotating structure (2) includes: A support frame (14) is mounted on the base (1); The first rotating shaft (15) and the second rotating shaft (16) are both mounted on the support frame (14), and the frame (3) is mounted on the first rotating shaft (15) and the second rotating shaft (16), and the first rotating shaft (15) and the second rotating shaft (16) are coaxially arranged.

3. The measuring device for measuring the starting friction torque of a universal joint bracket according to claim 2, characterized in that, The rotating structure (2) also includes a bearing seat (17) on the support frame (14), and the first rotating shaft (15) and the second rotating shaft (16) are on the support frame (14).

4. The measuring device for measuring the starting friction torque of a universal joint bracket according to claim 2 or 3, characterized in that, The adjustment structure includes: An expansion sleeve (18) is connected to the first rotating shaft (15). The expansion sleeve (18) is provided with a positioning disk (19), and multiple grooves (20) are provided on the outer wall of the positioning disk (19). A fixing block (21) is provided on the support frame (14), and a fixing pin (22) is provided on the fixing block (21), and a positioning pin (33) is provided in the groove (20).

5. The measuring device for measuring the starting friction torque of a universal joint bracket according to claim 4, characterized in that, There is a 10° angle difference between two adjacent grooves (20).

6. The measuring device for measuring the starting friction torque of a universal joint bracket according to claim 5, characterized in that, The calibration mechanism (9) includes: The calibration drive (23) is connected to the calibration sliding platform (24); The support base (25) is located on the correction sliding platform (24), and the correction shaft (10) is located on the support base (25).

7. The measuring device for measuring the starting friction torque of a universal joint bracket according to claim 6, characterized in that, The drive loading mechanism (11) includes: A loading sliding platform (26) is mounted on the mounting frame (8) and a loading drive (27) is provided at one end; Mounting base (28) is provided on loading sliding platform (26); A loading rod (29) is mounted on a mounting base (28), a second magnetic element (12) is mounted on the loading rod (29), and a detection element (13) is mounted on the free end of the loading rod (29).

8. The measuring device for measuring the starting friction torque of a universal joint bracket according to claim 7, characterized in that, The second magnetic component (12) includes: A copper sleeve is provided at the input end of the detection element (13); The permanent magnet (30) is located inside the copper sleeve.

9. The measuring device for measuring the starting friction torque of a universal joint bracket according to any one of claims 5-8, characterized in that, It also includes a positioning structure, which includes: Positioning screws (31) are located on the top of the frame (3) and are used to connect the part to be measured (4) and the frame (3); Spring pin (32) and positioning pin (33) are located at the bottom of frame (3) to fix the part to be measured (4).

10. A method for operating the measuring device for measuring the starting friction torque of a universal joint bracket according to any one of claims 1-9, characterized in that, include: The part to be measured (4) is set on the frame (3), and the measuring fixture (5) is set on the part to be measured (4). The position of the measuring fixture (5) is corrected by using the correction shaft (10) on the correction mechanism (9) to cooperate with the correction hole (7) on the measuring fixture (5). Then, the second magnetic component (12) on the drive loading mechanism (11) is used to reciprocate relative to the first magnetic component (6) on the measuring fixture (5). The maximum static friction force of the measuring fixture (5) in the rotation direction of the rotating structure (2) is detected by the detection element (13), thereby calculating the starting friction torque value in the rotation direction.

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