Limiting spring moment measuring device

Abstract

The invention discloses a torque measuring device for a limiting spring. The torque measuring device for the limiting spring comprises a bottom plate, a bearing, a driving cylinder and a torque wrench. The limiting spring is fixed in a spring fixing seat of the bottom plate, and an opening of the spring fixing seat faces the tangential direction. As the driving cylinder can rotate around the central column to drive the test pin connected to the driving cylinder to rotate around the central axis of the central column, the test pin can accurately enter through the U-shaped notch and extrude the two first arc-shaped sections of the limiting spring, so that the two first arc-shaped sections are expanded and deformed and enter the limiting spring; the rotation torque of the driving cylinder can be accurately measured by the torque wrench, so that the limiting torque of the limiting spring can be accurately and rapidly detected by adopting the limiting spring torque measuring device.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of part testing tooling, in particular to a limiting spring torque measuring device. BACKGROUND

[0002] A limiting snap spring is a ring-shaped mechanical fastener, which realizes a fixing function by limiting the axial displacement of assembled parts.

[0003] The limiting spring seat is widely applied to high-tech fields such as photoelectric rotating towers, photoelectric homing heads and robots, and plays a vital role in modern industry. The limiting spring torque measuring tooling can clearly determine the limiting effect of the limiting spring in the shaft system, and has guiding significance for the design of the shaft system, the selection of the motor and the limiting reliability of the shaft system parts. Therefore, it has unique advantages in the field of small-sized photoelectric homing heads and photoelectric rotating towers.

[0004] The incoming inspection of the limiting spring needs to test the limiting torque of the limiting spring. However, the measuring device in the related art is not reasonably designed, and cannot accurately detect the limiting torque of the limiting spring. In addition, other external errors are introduced in the measuring process, resulting in inaccurate errors, thereby affecting the minimum limiting torque measurement of the limiting spring. SUMMARY

[0005] The application provides a limiting spring torque measuring device, which can solve the technical problems that the measuring device in the prior art cannot accurately detect the limiting torque of the limiting spring due to unreasonable design, and the measuring process is complex. The technical solution is as follows:

[0006] A limiting spring torque measuring device, the limiting spring comprises a U-shaped main body part, two free end parts of the U-shaped main body part are integrally formed with a back bending structure; the back bending structure comprises: a first arc segment protruding from the free end part to the center area of the U-shaped main body part, and a second arc segment formed by the end of the first arc segment protruding in a direction away from the center of the U-shaped main body part, the limiting spring torque measuring device comprises a bottom plate, a bearing, a driving cylinder and a torque wrench.

[0007] The bottom plate is provided with a center column with a radius of R1 and a spring fixing seat at point A on the bottom plate, the point A is located on a circle with a center at the intersection of the center axis of the center column and the bottom plate and a radius of R2, wherein R2>R1, the spring fixing seat is provided with a U-shaped notch, and the opening of the U-shaped notch is parallel to the tangent direction of point A, the U-shaped notch is used for fixing the limiting spring; the bearing comprises an inner ring and an outer ring, the inner ring is sleeved on the center column and is in interference fit with the center column.

[0008] A driving cylinder is sleeved on the outer ring of the bearing and is in interference fit with the outer ring, and a test pin is arranged on the end face of the driving cylinder facing the bottom plate, and the distance between the test pin and the central axis of the central column is equal to R2; a torque wrench is used to drive the rotation of the driving cylinder and measure the rotation torque of the driving cylinder.

[0009] The minimum distance between the two first arc segments is D1, and the diameter of the test pin is D2, and D2>D1.

[0010] Optionally, the end of the driving cylinder away from the bottom plate is provided with two radial clamping grooves on the same diameter; the limit spring torque measuring device further comprises a measuring rod, the measuring rod is clamped in the two radial clamping grooves, and the middle part of the measuring rod has a through hole; the driving shaft of the torque wrench matches the through hole.

[0011] Optionally, the central column comprises a first cylinder, a second cylinder and a third cylinder which are coaxially arranged from the bottom plate in sequence, and the diameters of the first cylinder, the second cylinder and the third cylinder decrease in sequence; the inner wall of the end of the driving cylinder away from the bottom plate has an annular step, and an outer pressure ring is threadedly connected in the annular step; the bearing is sleeved on the second cylinder, the third cylinder is provided with an outer thread, and an inner pressure ring is threadedly connected on the third cylinder.

[0012] Optionally, the side of the driving cylinder facing the bottom plate is provided with a threaded hole for mounting the test pin, the test pin has a threaded segment matching the threaded hole, and the test pin is threadedly connected to the driving cylinder.

[0013] Optionally, the limit spring torque measuring device has a plurality of test pins with different diameters, and the diameters of the plurality of test pins are not equal.

[0014] Optionally, the two side walls at the opening of the U-shaped notch respectively have protruding parts extending to the inside of the U-shaped notch; the distance between the two protruding parts is L, and D2<L.

[0015] Optionally, the number of bearings is two, and the two bearings are axially sleeved on the central column along the central column.

[0016] The technical scheme provided by the embodiments of the application has at least the following beneficial effects:

[0017] The application discloses a limit spring torque measuring device, which comprises a bottom plate, a bearing, a driving cylinder and a torque wrench.

[0018] Other features and advantages of the present disclosure will be described in detail in the following detailed description section. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a schematic view of a limit spring;

[0021] Figure 2 is a schematic view of a limit spring torque testing device provided by the embodiments of the present application;

[0022] Figure 3 is a longitudinal sectional view of the limit spring torque testing device provided by the embodiments of the present application;

[0023] Figure 4 is an exploded view of the limit spring torque testing device provided by the embodiments of the present application;

[0024] Figure 5 is a top view of the bottom plate in the limit spring torque testing device provided by the embodiments of the present application;

[0025] Figure 6 is a schematic view of the bottom plate in the limit spring torque testing device provided by the embodiments of the present application;

[0026] Figure 7 is a schematic view of the cooperation between the limit spring and the test pin in the limit spring torque testing device provided by the embodiments of the present application.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 1-limiting spring; 11-U-shaped main body part; 12-bent-back structure; 121-first arc-shaped section; 122-second arc-shaped section; 2-bottom plate; 21-center column; 211-first cylinder; 212-second cylinder; 213-third cylinder; 22-spring fixing seat; 221-U-shaped notch; 222-protruding part; 3-bearing; 4-driving cylinder; 41-radial clamping groove; 42-annular step; 5-test pin; 6-torque wrench; 7-measuring rod; 71-through hole; 8-outer pressing ring; 9-inner pressing ring. DETAILED DESCRIPTION

[0029] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0030] In the present disclosure, the orientation words such as "up, down" used without the opposite description generally refer to the "up, down" of the corresponding components in the direction of gravity in the use state, and "inner, outer" refer to the "inner, outer" relative to the outline of the corresponding component itself. In addition, the terms "first", "second" and the like used in the present disclosure are used to distinguish one element from another element, and do not have sequential and important meanings. In the following description, the same reference signs in different drawings represent the same or similar elements unless otherwise explained. The limiting spring 1 includes a U-shaped main body part 11, both free ends of the U-shaped main body part 11 are integrally formed with a bent-back structure 12; the bent-back structure 12 includes: a first arc-shaped section 121 protruding from the corresponding free end to the center area of the U-shaped main body part 11, and a second arc-shaped section 122 protruding from the end of the first arc-shaped section 121 to the direction away from the center of the U-shaped main body part 11. By matching the curvatures of the first arc-shaped section 121 and the second arc-shaped section 122, the bent-back structure 12 has an elastic clamping matching space, and the limiting spring 1 is made of an elastic material to realize the limiting constraint of the target component through the cooperation of the holding force of the U-shaped main body part 11 and the elastic deformation of the bent-back structure 12. The incoming inspection of the limiting spring 1 needs to test the limiting torque of the limiting spring 1. However, the measuring device in the related art is not reasonable in design, and cannot accurately detect the limiting torque of the limiting spring 1, and other external errors are introduced in the measuring process, resulting in inaccurate errors, thereby affecting the minimum limiting torque measurement of the limiting spring 1.

[0031] According to the embodiments of the present application, referring to Figures 2 to 7 a limiting spring 1 torque measuring device, the limiting spring 1 torque measuring device comprises a bottom plate 2, a bearing 3, a driving cylinder 4 and a torque wrench 6.

[0032] Among them, referring to Figures 5 to 7As shown, the bottom plate 2 is provided with a center column 21 with a radius of R1 and a spring fixing seat 22 at point A on the bottom plate 2, the point A is located on a circle with the intersection of the center axis of the center column 21 and the bottom plate 2 as the center and a radius of R2, where R2>R1, the spring fixing seat 22 is provided with a U-shaped notch 221, and the opening of the U-shaped notch 221 is parallel to the tangent direction of point A, the U-shaped notch 221 is used to fix the limit spring 1.

[0033] Reference Figure 4 As shown, the bearing 3 includes an inner ring and an outer ring, the inner ring is sleeved on the center column 21 and is in interference fit with the center column 21; the driving cylinder 4 is sleeved on the outer ring of the bearing 3 and is in interference fit with the outer ring, the driving cylinder 4 is provided with a test pin 5 on the end face of the bottom plate 2, and the distance between the test pin 5 and the center axis of the center column 21 is equal to R2. Reference Figures 2 to 4 As shown, it also includes a torque wrench 6 for driving the rotation of the driving cylinder 4, the torque wrench 6 is used to measure the rotation torque of the driving cylinder 4. Wherein the minimum distance between two first arc segments 121 is D1, the diameter of the test pin 5 is D2, and D2>D1.

[0034] In the above embodiment, the limit spring 1 is fixed in the spring fixing seat 22 of the bottom plate 2, and the opening of the spring fixing seat 22 is oriented along the tangent direction. Since the driving cylinder 4 can rotate around the center column 21, the test pin 5 connected to the driving cylinder 4 rotates around the center axis of the center column 21, therefore, the test pin 5 can accurately enter the U-shaped notch 221 and press the two first arc segments of the limit spring 1, so that the two first arc segments are expanded and deformed and enter the inside of the limit spring 1, and the torque of the rotation of the driving cylinder 4 can be accurately measured by the torque wrench 6, therefore, the limit spring torque measuring device of the present application can accurately and quickly detect the limit torque of the limit spring 1. The limit spring torque measuring device of the present application can also be used to test the failure times of the limit spring 1.

[0035] According to an embodiment of the present application, reference Figure 3 As shown, the end of the driving cylinder 4 away from the bottom plate 2 is provided with two radial clamping grooves 41 on the same diameter; the limit spring torque measuring device further includes a measuring rod 7, the measuring rod 7 is clamped in the two radial clamping grooves 41, and the middle part of the measuring rod 7 has a through hole 71; the driving shaft of the torque wrench 6 matches the through hole 71. By such design, the limit spring torque measuring device can be quickly assembled and disassembled.

[0036] According to an embodiment of the present application, reference Figure 2 and Figure 3As shown, the center column 21 comprises a first cylinder 211, a second cylinder 212 and a third cylinder 213 coaxially arranged from the bottom plate 2 in sequence, and the diameters of the first cylinder 211, the second cylinder 212 and the third cylinder 213 decrease in sequence; the inner wall of the driving cylinder 4 far away from the bottom plate 2 has an annular step 42, and the outer pressure ring 8 is threadedly connected in the annular step 42; the bearing 3 is sleeved on the second cylinder 212, the third cylinder 213 is provided with external threads, and the inner pressure ring 9 is threadedly connected on the third cylinder 213. In the above embodiment, since there is a step between the first cylinder 211 and the second cylinder 212, when the inner ring of the bearing 3 is sleeved on the second cylinder 212, a gap between the inner ring of the bearing 3 and the bottom plate 2 can be ensured. Correspondingly, there is also a gap between the outer ring of the bearing 3 and the bottom plate 2, so that the inaccuracy caused by the friction between the inner and outer rings of the bearing 3 and the bottom plate 2 is avoided.

[0037] According to an embodiment of the present application, referring to Figure 2 As shown, the driving cylinder 4 is provided with a threaded hole on the side facing the bottom plate 2 for mounting the test pin 5, the test pin 5 has a threaded segment matching the threaded hole, and the test pin 5 is threadedly connected to the driving cylinder 4.

[0038] According to an embodiment of the present application, referring to Figure 3 As shown, the limit spring 1 torque measuring device has a plurality of test pins 5 of different diameters, and the diameters of the plurality of test pins 5 are not equal to each other. In other embodiments, a plurality of spring fixing seats 22 of different sizes can also be matched, so as to expand the application range of the limit spring 1 furnace measuring device.

[0039] According to an embodiment of the present application, referring to Figure 3 As shown, in order to prevent the limit spring 1 from being taken out of the U-shaped notch 221, the two side walls at the opening of the U-shaped notch 221 respectively have a protruding part 222 extending into the U-shaped notch 221; the distance between the two protruding parts 222 is L, and D2 and L satisfy: D2 < L. In this way, the test pin 5 can repeatedly enter and exit the U-shaped notch 221 of the spring fixing seat 22 without taking out the limit spring 1, so that in this case, the limit spring 1 torque measuring device can also be used for fatigue test of the limit spring 1.

[0040] According to an embodiment of the present application, referring to Figure 3 As shown, in order to further improve the rotational coaxiality of the driving cylinder 4 and the center column 21, the number of bearings 3 is two, and the two bearings 3 are axially sleeved on the center column 21 along the center column 21.

[0041] According to another embodiment of the present application, the driving cylinder 4 is provided with a plurality of first notches (not shown in the drawings) above the spring fixing seat 22, which are used to facilitate the placement and removal of the limiting spring 1 during testing.

[0042] In other embodiments, the lower end of the driving cylinder 4 can also be provided with a cantilever extending radially, and the test pin 5 is fixedly connected to the lower end of the cantilever. Correspondingly, the distance between the test pin 5 and the central axis of the center column 21 is equal to the distance between the spring fixing seat 22 and the central axis of the center column 21. In this case, the placement and removal of the limiting spring 1 can also be facilitated.

[0043] Reference Figures 1 to 7 The implementation principle of the limiting spring 1 torque measuring device of the present application will be described below in combination with specific operation steps:

[0044] First step: Rotate the driving cylinder 4 so that the test pin 5 is outside the spring fixing seat 22, and place a limiting spring 1 from the U-shaped notch 221 of the spring fixing seat 22, so that the opening of the limiting spring 1 is consistent with the opening direction of the U-shaped notch 221 of the spring fixing seat 22;

[0045] Second step: Place the measuring rod 7 in the radial clamping groove 41 at the upper end of the driving cylinder 4, and insert the driving shaft of the torque wrench 6 into the through hole 71 in the middle of the measuring rod 7;

[0046] Third step: Rotate the torque wrench 6 and record the maximum torque of the torque wrench 6;

[0047] Fourth step: Repeat the third step, record multiple maximum torque values, and calculate the average value to obtain the maximum torque of the limiting spring 1;

[0048] Fifth step: Pull out the driving shaft of the torque wrench 6 from the through hole 71 of the measuring rod 7, remove the measuring rod 7, remove the limiting spring 1 from the spring fixing seat 22, and end the test.

[0049] The preferred embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the specific details in the above-described embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, and these simple modifications all belong to the protection scope of the present application.

[0050] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the present application.

[0051] Furthermore, the various embodiments of the present disclosure can be arbitrarily combined with each other unless they contradict each other, and it should be understood that the same should be construed as being included in the disclosure of the present disclosure.

Claims

1. A limiting spring torque measuring device, wherein the limiting spring (1) includes a U-shaped main body (11), and two free ends of the U-shaped main body (11) are respectively integrally formed with a return structure (12); the return structure (12) includes: a first arc-shaped segment (121) protruding from the corresponding free ends toward the center region of the U-shaped main body (11), and a second arc-shaped segment (122) protruding from the end of the first arc-shaped segment (121) in a direction away from the center of the U-shaped main body (11), characterized in that, The limiting spring torque measuring device includes: The base plate (2) is provided with a central column (21) with radius R1 and a spring fixing seat (22) located at point A on the base plate (2). Point A is located on a circle with radius R2 centered at the intersection of the central axis of the central column (21) and the base plate (2), where R2 > R1. The spring fixing seat (22) is provided with a U-shaped notch (221), and the opening of the U-shaped notch (221) is parallel to the tangent direction of point A. The U-shaped notch (221) is used to fix the limiting spring (1). The bearing (3) includes an inner ring and an outer ring, wherein the inner ring is fitted on the central column (21) and is interference-fitted with the central column (21); The drive cylinder (4) is sleeved on the outer ring of the bearing (3) and is interference-fitted with the outer ring. The end face of the drive cylinder (4) facing the base plate (2) is provided with a test pin (5). The distance between the test pin (5) and the central axis of the central column (21) is equal to R2. And a torque wrench (6) for driving the drive cylinder (4) to rotate, the torque wrench (6) being used to measure the rotational torque of the drive cylinder (4); The minimum distance between the two first arc segments (121) is D1, the diameter of the test pin (5) is D2, and D1 and D2 satisfy D2 > D1.

2. The limiting spring torque measuring device according to claim 1, characterized in that, The drive cylinder (4) has two radial slots (41) on the same diameter at one end away from the base plate (2). The torque measuring device of the limiting spring (1) also includes a measuring rod (7), which is fitted into two radial slots (41) and has a through hole (71) in the middle; the drive shaft of the torque wrench (6) matches the through hole (71).

3. The limiting spring torque measuring device according to claim 2, characterized in that, The central column (21) includes a first cylinder (211), a second cylinder (212) and a third cylinder (213) arranged coaxially from near to far from the base plate (2), and the diameters of the first cylinder (211), the second cylinder (212) and the third cylinder (213) decrease sequentially. The inner wall of the drive cylinder (4) away from the bottom plate (2) has an annular step (42), and the annular step (42) is internally threaded with an outer pressure ring (8). The bearing (3) is fitted on the second cylinder (212), and the third cylinder (213) is provided with an external thread. An inner pressure ring (9) is threaded onto the third cylinder (213).

4. The limiting spring torque measuring device according to claim 3, characterized in that, The drive cylinder (4) has a threaded hole on the side facing the base plate (2) for installing the test pin (5). The test pin (5) has a threaded section that matches the threaded hole and is threadedly connected to the drive cylinder (4).

5. The limit spring torque measuring device according to claim 1, characterized in that, The limit spring (1) torque measuring device has multiple test pins (5) with different diameters.

6. The limit spring torque measuring device according to claim 1, characterized in that, The opening of the U-shaped notch (221) has two sidewalls with protrusions (222) extending into the U-shaped notch (221). The distance between the two protrusions (222) is L, and L and D2 satisfy the condition: D2 < L.

7. The limit spring torque measuring device according to claim 1, characterized in that, The number of bearings (3) is two, and the two bearings (3) are axially sleeved on the central column (21) along the central column (21).

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