Vernier caliper for diaphragm spring detection

Abstract

The invention relates to a vernier caliper for diaphragm spring detection. A vernier scale is arranged on a caliper body of a main caliper in a sleeving manner; the lantern ring movably sleeves the caliper body outside the vernier scale, the bottom of the lantern ring is vertically and fixedly connected with a supporting column, the lower end of the supporting column is horizontally and fixedly connected with a bottom plate, V-shaped openings are symmetrically formed in the front end of the bottom plate, and the symmetry axis of the V-shaped openings is collinear with a fixed measuring claw at the front end of the caliper body and a sliding measuring claw at the front end of the vernier scale; the bottom plate is coplanar with ruler tips at the bottoms of the fixed measuring claw and the sliding measuring claw. Due to the symmetry of the V-shaped opening, the symmetry axis of the V-shaped opening is located on the radius of the diaphragm spring, and the symmetry axis of the V-shaped opening is collinear with the connecting line of the fixed measuring claw and the sliding measuring claw, the main scale and the diameter of the diaphragm spring are collinear, then the vernier scale is slid to enable the sliding measuring claw to abut against the outer arc line of the separation finger, and the width of the diaphragm spring can be measured. The above steps are repeated, different separation fingers are replaced for multiple times of measurement, and the coaxiality error of the diaphragm spring can be obtained.

Description

Technical Field

[0001] This invention relates to the field of diaphragm spring manufacturing technology, and in particular to a vernier caliper for testing diaphragm springs. Background Technology

[0002] Currently, when testing the coaxiality of diaphragm springs, they are typically placed on a secondary precision plate, and the width of the diaphragm spring is measured using vernier calipers with a graduation value less than or equal to 0.02 mm. At least three measurements are taken at different positions, and the coaxiality error is determined by calculating the difference between the maximum measured value and the theoretical value. However, when using existing vernier calipers, due to the structural characteristics of the diaphragm spring, the fixed measuring jaw is not at the center of the diaphragm spring. The diaphragm spring is only in contact with two points: the fixed measuring jaw and the sliding measuring jaw. When measuring the width, it is difficult for the vernier caliper to be collinear with the diameter of the diaphragm spring. This causes measurement errors, resulting in inaccurate test results, which in turn affects the quality assessment and subsequent use of the diaphragm spring. Summary of the Invention

[0003] The purpose of this invention is to provide a vernier caliper for diaphragm spring testing, thereby solving the aforementioned problems in the prior art.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A vernier caliper for diaphragm spring testing includes a main scale, a vernier scale, and a limiting module. The vernier scale is fitted onto the main scale. The limiting module includes a collar, a support column, and a base plate. The collar is movably fitted onto the outer side of the vernier scale. The support column is vertically fixed to the bottom of the collar, and the base plate is horizontally fixed to the lower end of the support column. The base plate has symmetrically arranged V-shaped openings at its front end, and the axis of symmetry of the V-shaped openings is collinear with the fixed measuring claw at the front end of the main scale and the sliding measuring claw at the front end of the vernier scale. The base plate is coplanar with the tips of the fixed measuring claw and the sliding measuring claw.

[0005] The beneficial effects of this invention are as follows: The diaphragm spring to be tested is placed horizontally on a secondary precision plate. The fixed measuring claw extends into the central hole of the diaphragm spring. A separating finger is selected, and the fixed measuring claw is pressed against the midpoint of the inner arc of the separating finger. Simultaneously, the angle of the main scale is adjusted, and the sliding collar is slid so that both sides of the V-shaped opening are pressed against the outer arc of the separating finger. Due to the symmetry of the V-shaped opening, the axis of symmetry of the V-shaped opening is located on the radius of the diaphragm spring. Furthermore, the axis of symmetry of the V-shaped opening is collinear with the line connecting the fixed measuring claw and the sliding measuring claw. Therefore, the main scale is collinear with the diameter of the diaphragm spring. The vernier scale is then slid so that the sliding measuring claw abuts against the outer arc of the separating finger, thus measuring the width of the diaphragm spring. Repeating the above steps and changing different separating fingers for multiple measurements yields the coaxiality error of the diaphragm spring.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the first and second cutting edges of both the fixed measuring jaw and the sliding measuring jaw are single cutting edges with triangular cross-sections.

[0008] The further beneficial effect of adopting the above is that the triangular cutting edge can make point contact with the arc-shaped edge of the diaphragm spring, further improving the measurement accuracy and reducing measurement error.

[0009] Furthermore, it also includes fastening bolts, with a vertical threaded connection at the top of the vernier scale.

[0010] The further beneficial effect of adopting the above is that after the fixed measuring jaw and the sliding measuring jaw are clamped onto the diaphragm spring, the fastening bolt is tightened. The bottom of the fastening bolt is pressed against the scale body to prevent the sliding measuring jaw from moving, which makes it easier for the operator to read the value. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a vernier caliper for diaphragm spring testing according to the present invention; Figure 2 This is a side view of a vernier caliper for diaphragm spring testing according to the present invention; Figure 3 This is a schematic diagram illustrating the use of a vernier caliper for diaphragm spring testing according to the present invention; Figure 4 This is a diagram of existing technology.

[0012] The attached diagram lists the components represented by each number as follows: 1. Main scale; 11. Fixed measuring jaw; 111. First cutting edge; 12. Scale body; 2. Vernier scale; 21. Sliding measuring jaw; 211. Second cutting edge; 22. Fastening bolt; 3. Limiting module; 31. Collar; 32. Support column; 33. Base plate; 331. V-shaped opening; 4. Diaphragm spring; 41. Separation finger. Detailed Implementation

[0013] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0014] Example 1 like Figures 1 to 3As shown, a vernier caliper for diaphragm spring testing includes a main scale 1, a vernier scale 2, and a limiting module 3. The vernier scale 2 is fitted onto the scale body 12 of the main scale 1. The limiting module 3 includes a collar 31, a support column 32, and a base plate 33. The collar 31 is movably fitted onto the scale body 12 outside the vernier scale 2. The support column 32 is vertically fixedly connected to the bottom of the collar 31. The base plate 33 is horizontally fixedly connected to the lower end of the support column 32. The front end of the base plate 33 has symmetrically opened V-shaped openings 331, and the axis of symmetry of the V-shaped openings 331 is collinear with the fixed measuring claw 11 at the front end of the scale body 12 and the sliding measuring claw 21 at the front end of the vernier scale 2. The base plate 33 is coplanar with the tips of the fixed measuring claw 11 and the sliding measuring claw 21.

[0015] Place the diaphragm spring 4 to be tested horizontally on a secondary precision plate, and insert the fixed measuring claw 11 into the central hole of the diaphragm spring 4. Select a separating finger 41 and press the fixed measuring claw 11 against the midpoint of the inner arc of the separating finger 41. At the same time, adjust the angle of the main scale 1 and slide the collar 31 so that both sides of the V-shaped opening 331 are pressed against the outer arc of the separating finger 41. Due to the symmetry of the V-shaped opening 331, the axis of symmetry of the V-shaped opening 331 is located on the radius of the diaphragm spring 4. Since the axis of symmetry of the V-shaped opening 331 is collinear with the line connecting the fixed measuring claw 11 and the sliding measuring claw 21, the main scale 1 is collinear with the diameter of the diaphragm spring 4. Then slide the vernier scale 2 so that the sliding measuring claw 21 is pressed against the outer arc of the separating finger 41. The width of the diaphragm spring 4 can be measured. Repeat the above steps and change different separating fingers 41 to perform multiple measurements to obtain the coaxiality error of the diaphragm spring 4.

[0016] Example 2 This embodiment is a further improvement on embodiment 1, as detailed below: The first cutting edge 111 and the second cutting edge 211 of the fixed measuring jaw 11 and the sliding measuring jaw 21 are both single cutting edges with triangular cross-sections. The triangular cutting edges can make point contact with the arc-shaped edge of the diaphragm spring 4, further improving measurement accuracy and reducing measurement errors.

[0017] It also includes a fastening bolt 22, which is vertically threaded onto the top of the vernier scale 2. After the fixed measuring claw 11 and the sliding measuring claw 21 are clamped onto the diaphragm spring 4, the fastening bolt 22 is tightened. The bottom of the fastening bolt 22 abuts against the scale body 12 to prevent the sliding measuring claw 21 from moving, making it easier for the operator to read the value.

[0018] Example 3 This embodiment is a further improvement on embodiment 1, as detailed below: The support column 32 has reinforcing ribs on both sides of its bottom. By adding reinforcing ribs, the deformation resistance of the support column 32 and the base plate 33 can be improved, and the overall rigidity can be enhanced.

[0019] The main scale 1, vernier scale 2, collar 31, support column 32, and base plate 33 are all made of carbon steel. Carbon steel has good hardness and wear resistance.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vernier caliper for testing diaphragm springs, characterized in that, The device includes a main scale (1), a vernier scale (2), and a limiting module (3). The vernier scale (2) is fitted onto the body (12) of the main scale (1). The limiting module (3) includes a collar (31), a support column (32), and a base plate (33). The collar (31) is movably fitted onto the body (12) outside the vernier scale (2). The support column (32) is vertically fixed to the bottom of the collar (31). The base plate (33) is horizontally fixed to the lower end of the support column (32). The base plate (33) has a V-shaped opening (331) symmetrically opened at the front end. The axis of symmetry of the V-shaped opening (331) is collinear with the line connecting the fixed measuring claw (11) at the front end of the body (12) and the sliding measuring claw (21) at the front end of the vernier scale (2). The base plate (33) is coplanar with the tips of the fixed measuring claw (11) and the sliding measuring claw (21).

2. The vernier caliper for diaphragm spring testing according to claim 1, characterized in that, The first cutting edge (111) and the second cutting edge (211) of the fixed measuring claw (11) and the sliding measuring claw (21) are both single cutting edges and have a triangular cross-section.

3. The vernier caliper for diaphragm spring testing according to claim 2, characterized in that, It also includes a fastening bolt (22), which is vertically threaded onto the top of the vernier scale (2).

4. The vernier caliper for diaphragm spring testing according to claim 1, characterized in that, The support column (32) has reinforcing ribs on both sides of its bottom.

5. The vernier caliper for diaphragm spring testing according to any one of claims 1 to 4, characterized in that, The main scale (1), the vernier scale (2), the collar (31), the support column (32), and the base plate (33) are all made of carbon steel.

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