A detection fixture for spring-like parts

Abstract

The present application belongs to the technical field of detection fixture, and specifically discloses a detection fixture for spring parts, which comprises a top rod, a pressing rod arranged above the top rod and matched with the top rod in a gap, an arc clamping piece I connected with the top rod, and an arc clamping piece II connected with the pressing rod. The present application has the characteristics of effective constraint and positioning, reliability, convenient loading and unloading, quick and accurate replacement of test bodies, etc. The present application effectively improves the test reliability by effectively constraining the spring joint surface and the outer cylindrical surface for testing springs of various specifications, and by designing the temperature control section and the limiting section together. As a positioning detection fixture, the present application can quickly position the outer circle, reference surface and radial displacement of the parts, and after quick and convenient testing and replacement of the test body, the subsequent test can be directly performed without complex positioning, thereby effectively reducing the test period and improving the test accuracy and efficiency.

Description

Technical Field

[0001] This invention belongs to the field of testing fixture technology, and specifically relates to a testing fixture for spring-type parts. Background Technology

[0002] Spacecraft docking mechanisms utilize many elastic components, with compression springs being one of the most common. To ensure that these springs can function safely and stably in spacecraft docking mechanisms over a long period, it is necessary to simulate the working environment in space. For example, this involves subjecting the springs to gradient heating or cooling, and conducting rigorous stress relaxation tests on these compression springs under different temperature conditions.

[0003] During the test, the spring was placed vertically and pressed between the upper and lower pressure heads of the pressure testing machine with the assistance of the testing fixture. Due to the inherent defects of the existing testing fixture and the differences in mechanical properties between different batches of springs, the spring will have a large lateral displacement as the press is pressed down, and the measurement data will show large fluctuations, resulting in low accuracy and poor repeatability of the test results, as well as problems such as long test cycle and low efficiency. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a testing fixture for spring-type parts that can improve testing accuracy and efficiency, reduce testing cycle, and enhance testing reliability.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] A testing fixture for spring-type parts includes a push rod, a pressure rod that is clearance-fitted to the push rod above the push rod, an arc-shaped clamp I connected to the push rod on the push rod, and an arc-shaped clamp II connected to the pressure rod on the pressure rod.

[0007] Preferably, the top rod has a stepped shaft-like structure, which includes, from bottom to top, a clamping section I, a heating section I, a positioning section I that mates with the arc-shaped clamp I, and a limiting section. The heating section I is connected to the positioning section I through a heating connecting rod I. The side of the positioning section I near the limiting section is symmetrically provided with fan-shaped recesses I that mate with the arc-shaped clamp I. The clamping section I and the heating section I are detachably connected. The top of the clamping section I is provided with a sealing ring and adhesive that are sealed to the heating section I.

[0008] Preferably, the arc-shaped clamp I includes a double arc structure I symmetrically arranged on the positioning section I and connected to the fan-shaped groove I. The double arc structure I includes a large-diameter arc plate I connected to the side of the positioning section I. The large-diameter arc plate I is provided with a small-diameter arc plate I that is clearance-fitted with the limiting section. The small-diameter arc plate I is connected to the large-diameter arc plate I through a transition surface I. The transition surface I is in contact with the fan-shaped groove I. The length of the limiting section is 2 / 3 of the original length of the detection piece.

[0009] Preferably, the pressure rod has a stepped shaft-like structure, which includes, from top to bottom, a clamping section II, a heating section II, and a positioning section II that cooperates with the arc-shaped clamping piece II. The heating section II is connected to the positioning section II through a heating connecting rod II. The side of the positioning section II away from the heating section II is symmetrically provided with fan-shaped recesses II that cooperate with the arc-shaped clamping piece II. The clamping section II and the heating section II are detachably connected. The top of the clamping section II is provided with a sealing ring and adhesive dots that are sealed to the heating section II.

[0010] Preferably, the arc-shaped clamping component II includes a double arc structure II symmetrically arranged on the positioning section II and connected to the fan-shaped recess II. The double arc structure II includes a large-diameter arc plate II connected to the side of the positioning section II. A small-diameter arc plate II is provided below the large-diameter arc plate II. The small-diameter arc plate II is connected to the large-diameter arc plate II through a transition surface II. The transition surface II is in contact with the fan-shaped recess II.

[0011] Preferably, the central angle between the large-diameter arc plate I and the small-diameter arc plate I is 100 degrees, and the large-diameter arc plate I and the small-diameter arc plate I are coaxial arc plates.

[0012] Preferably, the central angle between the large-diameter circular arc plate II and the small-diameter circular arc plate II is 90 degrees, and the large-diameter circular arc plate II and the small-diameter circular arc plate II are coaxial circular arc plates.

[0013] Preferably, both positioning section I and positioning section II have fixing holes on their sides that mate with large-diameter arc plate I and large-diameter arc plate II, respectively. The fixing holes mate with countersunk holes on large-diameter arc plate I and large-diameter arc plate II, respectively. Both heating section I and heating section II have oil passage holes. The fixing holes are respectively located on the center lines of the corresponding fan-shaped groove I and fan-shaped groove II.

[0014] Preferably, the diameter of the large-diameter arc plate I is not equal to the diameter of the small-diameter arc plate I, which is not equal to the diameter of the large-diameter arc plate II.

[0015] Preferably, at the large diameter of the stepped shaft in the pressure rod and the push rod, i.e., at heating section I and heating section II, a flowing hot fluid is used to control the temperature of the material, thereby indirectly controlling the temperature of the upper and lower ends of the test piece; both the pressure rod and the push rod are made of materials with high thermal conductivity.

[0016] Preferably, it also includes a heater, which includes a heating block sleeved on the limiting section and clearance-fitted with the limiting section. The heating block is clearance-fitted with clamping section I and clamping section II. The heating block includes heating plates symmetrically arranged on both sides of the limiting section. The side of the heating plate near the limiting section is provided with a semi-circular heating hole that is clearance-fitted with the limiting section.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] (1) This application provides effective and reliable constraint and limit on the test spring by setting arc clamp I and arc clamp II on the clearance fit top rod and pressure rod respectively, so as to prevent the test spring from radially deviating during the test and reduce the test failure rate. When the test spring is replaced, the gap between the top rod and pressure rod can be increased to easily remove the test body from the top rod, thereby achieving the purpose of quickly and accurately replacing the test body.

[0019] (2) The top rod and the pressure rod are fixed in the lower chuck and upper chuck of the testing machine through clamping section I and clamping section II, respectively; the upper and lower ends of the test body are heated simultaneously through heating section I and heating section II; the arc clamp I and arc clamp II are fixed through positioning section I and positioning section II, respectively; the test body is limited and placed through the limiting section, which facilitates the quick replacement of test springs, etc.; by setting fan-shaped recess I and fan-shaped recess II, the arc clamp I and arc clamp II can be accurately and stably fixed on positioning section I and positioning section II, respectively. The materials of all parts of the fixture in this application are the same as those of the spring parts, and all are made of high thermal conductivity materials to ensure that the overall temperature of the spring parts is consistent when the spring parts are tested at different temperatures. The material of all parts of the spring parts and fixtures is 0Cr18Ni9.

[0020] (3) The double arc structure I is fixedly connected to the positioning section I through the large-diameter arc plate I, and then fixed in the fan-shaped groove I through the transition surface I. This can firmly fix the double arc structure I on the positioning section I. When conducting tests on spring-type parts, it can prevent the double arc structure I from moving laterally or longitudinally on the positioning section I, reduce the error caused by the movement of the test body, and ensure the reliability of the test. The double arc structure II is fixedly connected to the positioning section II through the large-diameter arc plate II, and then fixed in the fan-shaped groove II through the transition surface II. This can firmly fix the double arc structure II on the positioning section II. When conducting tests on spring-type parts, it can prevent the double arc structure II from moving laterally or longitudinally on the positioning section II, reduce the error caused by the movement of the test body, and ensure the reliability and stability of the test.

[0021] (4) The small-diameter arc plate I, in conjunction with the limiting section, can quickly and accurately replace the test body, effectively improving the test efficiency; by setting small-diameter arc plates I and II of different diameters, the spring mating surface and outer cylindrical surface can be effectively constrained to realize spring tests of various specifications; by setting arc clamps I and arc clamps II on the top rod and pressure rod, the outer circle, reference surface and radial displacement of the part can be quickly positioned, which is convenient for rapid testing; by setting separate top rods and pressure rods, the test body can be quickly and accurately replaced.

[0022] In summary, this invention features effective and reliable constraint limiting, convenient loading and unloading, and quick and accurate replacement of the test body. By effectively constraining the spring mating surface and outer cylindrical surface, this invention can be used for testing springs of various specifications. The design of the heating section and positioning section together effectively improves test reliability. As a positioning and testing fixture, this invention can quickly position the outer circle, datum surface, and radial displacement of parts. It not only facilitates rapid testing but also eliminates the need for complex positioning after replacing the test body, allowing for direct subsequent testing, thereby effectively reducing the test cycle and improving test accuracy and efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention in Embodiment 1;

[0024] Figure 2 This is a schematic diagram of the connection between the push rod and the arc-shaped clamp I in Embodiment 1;

[0025] Figure 3 This is a schematic diagram of the connection between the pressure rod and the arc-shaped clamp II in Embodiment 1;

[0026] Figure 4 This is a schematic diagram of the top rod structure in Example 1;

[0027] Figure 5 This is a schematic diagram of the top rod structure in Example 1;

[0028] Figure 6 This is a schematic diagram of the arc-shaped clip I in Example 1;

[0029] Figure 7 This is a schematic diagram of the compression bar in Example 1;

[0030] Figure 8 This is a schematic diagram of the compression bar in Example 1;

[0031] Figure 9 This is a schematic diagram of the arc-shaped clip II in Example 1;

[0032] Figure 10 This is a schematic diagram of the connection between the push rod and the test spring in Example 1;

[0033] Figure 11 This is a schematic diagram of the experimental structure of this application in Example 1;

[0034] Figure 12 This is a schematic diagram of the internal structure of heating section I and positioning section I in Example 5;

[0035] Figure 13 This is a cross-sectional view of heating section I and positioning section I in Example 5.

[0036] In the diagram, 1. Top rod, 2. Test spring, 3. Pressure rod, 4. Arc clamp I, 5. Arc clamp II, 6. Pipe connector, 7. Pipe connector, 8. Heating plate, 9. Heating plate, 10. Lower chuck, 11. Upper chuck, 101. Clamping section I, 102. Heating section I, 103. Positioning section I, 104. Limiting section, 105. Oil passage hole, 106. Fixing hole, 107. Fan-shaped recess I, 108. Large diameter arc plate I. 109. Small diameter arc plate I; 110. Transition surface I; 111. Countersunk hole; 112. Oil pipe; 113. Oil pipe; 114. Oil guide pipe; 301. Clamping section II; 302. Heating section II; 303. Positioning section II; 304. Oil hole; 305. Fixing hole; 306. Fan-shaped groove II; 307. Large diameter arc plate II; 308. Small diameter arc plate II; 309. Transition surface II; 310. Countersunk hole. Detailed Implementation

[0037] The present invention will be further described in detail below through specific embodiments, but this does not limit the scope of the present invention.

[0038] Example 1

[0039] A testing fixture for spring-type parts, the structure of which is as follows: Figure 1 - Figure 11 As shown (where Figure 10 The arc-shaped locking component II 5 is not shown. It includes a top rod 1, a pressure rod 3 that is clearance-fitted with the top rod 1 above the top rod 1, an arc-shaped locking component I 4 connected to the top rod 1 on the top rod 1, and an arc-shaped locking component II 5 connected to the pressure rod 3 on the pressure rod 3.

[0040] The top rod 1 has a stepped shaft-like structure, which includes, from bottom to top, a clamping section I 101, a heating section I 102, a positioning section I 103 that cooperates with the arc-shaped clamp I 4, and a limiting section 104. The side of the positioning section I 103 near the limiting section 104 is symmetrically provided with a fan-shaped groove I 107 that cooperates with the arc-shaped clamp I 4. The arc-shaped fastener I 4 includes a double arc structure I symmetrically arranged on the positioning section I 103 and connected to the fan-shaped recess I 107. The double arc structure I includes a large-diameter arc plate I 108 connected to the side of the positioning section I 103. The large-diameter arc plate I 108 is provided with a small-diameter arc plate I 109 that is clearance-fitted with the limiting section 104. The small-diameter arc plate I 109 is connected to the large-diameter arc plate I 108 through a transition surface I 110. The transition surface I 110 is in contact with the fan-shaped recess I 107.

[0041] The pressure rod 3 has a stepped shaft-like structure, consisting of a clamping section II 301, a heating section II 302, and a positioning section II 303 that mates with the arc-shaped clamping piece II 5, arranged from top to bottom. Symmetrically arranged on the side of the positioning section II 303 away from the heating section II 302 are fan-shaped recesses II 306 that mate with the arc-shaped clamping piece II 5. The arc-shaped clamping piece II 5 includes a double arc structure II symmetrically arranged on the positioning section II 303 and connected to the fan-shaped recesses II 306. The double arc structure II includes a large-diameter arc plate II 307 connected to the side of the positioning section II 303. A small-diameter arc plate II 308 is located below the large-diameter arc plate II 307. The small-diameter arc plate II 308 is connected to the large-diameter arc plate II 307 via a transition surface II 309, which is in contact with the fan-shaped recesses II 306.

[0042] The central angle subtended by the large-diameter circular arc plate I 108 and the small-diameter circular arc plate I 109 is 100 degrees. The large-diameter circular arc plate I 108 and the small-diameter circular arc plate I 109 are coaxial circular arc plates. The central angle subtended by the large-diameter circular arc plate II 307 and the small-diameter circular arc plate II 308 is 90 degrees. The large-diameter circular arc plate II 307 and the small-diameter circular arc plate II 308 are coaxial circular arc plates.

[0043] Positioning section I 103 and positioning section II 303 are respectively provided with fixing holes 106 and 305 on their sides, which are respectively matched with large diameter arc plate I 108 and large diameter arc plate II 307. Fixing holes 106 and 305 are respectively matched with countersunk holes 111 and 310 provided on large diameter arc plate I 108 and large diameter arc plate II 307. Heating section I 102 and heating section II 302 are respectively provided with oil passage holes 105 and 304.

[0044] The diameter of large-diameter arc plate I 108 is not the same as the diameter of small-diameter arc plate I 109. The diameter of large-diameter arc plate II 307 is not the same as the diameter of small-diameter arc plate II 308.

[0045] At the large diameter of the stepped shaft in pressure rod 3 and push rod 1, i.e., heating section I 102 and heating section II 302, the temperature of the material is controlled by a flowing hot fluid, indirectly controlling the temperature of the upper and lower ends of the test piece; both pressure rod 3 and push rod 1 are made of materials with high thermal conductivity.

[0046] In use, install the arc-shaped clamp I 4 onto the positioning section I 103 of the top rod 1, and install the arc-shaped clamp II 5 onto the positioning section II 303 of the pressure rod 3. Adjust the positions of the small-diameter arc plates I 109 and II 308 respectively, so that the transition surfaces I 110 and II 309 are fully fitted with the fan-shaped grooves I 107 and II 306 respectively. Use countersunk screws to install the large-diameter arc plates I 108 and II 307 into the fixing holes 106 and 305 on the side of the positioning sections I 103 and II 303 respectively through the countersunk holes 111 and 310. Then, install the assembly of the top rod 1 and the arc-shaped clamp I 4 into the lower chuck 10 of the testing machine through the clamping section I 101, and clamp the pressure rod 3 and the arc-shaped clamp II 5 through the clamping section II 301. The assembly of component 5 is installed in the upper chuck 11 of the testing machine. Pipe joints 6 and 7 are installed in heating section I 102 and heating section II 302 through oil passages 105 and 304 respectively. Oil pipes are installed, and test spring 2 is placed on the limiting section 104. Heating plates 8 and 9 are placed on the test spring 2. The pressure rod 3 is adjusted to a suitable position, the circulating oil is turned on, and the heater is turned on, so that the test can be carried out quickly.

[0047] When installing the top rod 1 and the pressure rod 3, the top of the clamping section I 101 has a sealing ring and adhesive that are sealed to the heating section I 102; the top of the clamping section II 301 has a sealing ring and adhesive that are sealed to the heating section II 302; at the junction of the pipe joint 6 and the oil passage hole 105, at the junction of the countersunk screw and the countersunk hole 111 and the fixing hole 106, at the junction of the pipe joint 7 and the oil passage hole 304, and at the junction of the countersunk screw and the countersunk hole 310 and the fixing hole 305, there is thread adhesive.

[0048] After raising the pressure bar 3, separating the heater, and ending the oil circulation, the test body can be removed and replaced with other bodies of the same or different structures.

[0049] Example 2

[0050] A testing fixture for spring-type parts differs from Embodiment 1 in that the diameter of the clamping section I 101 is not equal to the diameter of the heating section I 102, the diameter of the positioning section I 103, or the diameter of the limiting section 104.

[0051] Example 3

[0052] A testing fixture for spring-type parts differs from Embodiment 1 in that the diameter of the clamping section II 301 is not equal to the diameter of the heating section II 302, which is not equal to the diameter of the positioning section II 303.

[0053] Example 4

[0054] A testing fixture for spring-type parts differs from Embodiment 1 in that: a fluid cavity is provided inside both heating section I 102 and heating section II 302, and the top of the fluid cavity is respectively located inside positioning section I 103 and positioning section II 303.

[0055] Example 5

[0056] A testing fixture for spring-type parts, the structure of which is as follows: Figure 12 - Figure 13 As shown (where Figure 12 (The internal structure is shown through perspective). The difference from Example 1 is that: each of the heating section I 102 and heating section II 302 is provided with a pair of clearance-fitted oil passage pipes 112 and 113, which are connected to oil passage holes 105 and 304 respectively. Both oil passage pipes 112 and 113 are connected to oil guide pipes 114 respectively set in positioning section I 103 and positioning section II 303. During installation and use, all threaded connections are sealed with sealant, and sealing rings are added at the connection between clamping section I 101 and heating section I 102, and at the connection between clamping section II 301 and heating section II 302. After the addition of oil passage pipes 112, 113 and oil guide pipes 114, the internal structure of pressure rod 3 and top rod 1 is different from that of Example 1. Because flow channels are designed in top rod 1 and pressure rod 3, clamping section I 101 and clamping section II 301 are set separately and have the same structure.

[0057] Example 6

[0058] A testing fixture for spring-type parts differs from Embodiment 1 in that the central angles subtended by the large-diameter arc plate II and the small-diameter arc plate II are 60-120 degrees.

[0059] Example 7

[0060] A testing fixture for spring-type parts differs from Embodiment 1 in that the central angles subtended by the large-diameter arc plate I and the small-diameter arc plate I are 70-130 degrees.

[0061] The above description is only a preferred embodiment of the present invention, but is not limited to the above examples. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A testing fixture for spring-type parts, characterized in that, It includes a push rod, a pressure rod that is clearance-fitted with the push rod above the push rod, an arc-shaped fastener I connected to the push rod on the push rod, and an arc-shaped fastener II connected to the pressure rod on the pressure rod; The top rod is a stepped shaft-type structure, which includes, from bottom to top, a clamping section I, a heating section I, a positioning section I that cooperates with the arc-shaped clamp I, and a limiting section. The side of the positioning section I near the limiting section is symmetrically provided with a fan-shaped groove I that cooperates with the arc-shaped clamp I. The arc-shaped fastener I includes a double arc structure I symmetrically arranged on the positioning section I and connected to the fan-shaped groove I. The double arc structure I includes a large-diameter arc plate I connected to the side of the positioning section I. The large-diameter arc plate I is provided with a small-diameter arc plate I that is clearance-fitted with the limiting section. The small-diameter arc plate I is connected to the large-diameter arc plate I through a transition surface I. The transition surface I is in contact with the fan-shaped groove I. The pressure bar is a stepped shaft structure, which includes, from top to bottom, a clamping section II, a heating section II, and a positioning section II that cooperates with the arc-shaped clamp II. The side of the positioning section II away from the heating section II is symmetrically provided with a fan-shaped groove II that cooperates with the arc-shaped clamp II. The arc-shaped fastener II includes a double arc structure II symmetrically arranged on the positioning section II and connected to the fan-shaped groove II. The double arc structure II includes a large-diameter arc plate II connected to the side of the positioning section II. A small-diameter arc plate II is provided below the large-diameter arc plate II. The small-diameter arc plate II is connected to the large-diameter arc plate II through a transition surface II. The transition surface II is in contact with the fan-shaped groove II. The sides of positioning section I and positioning section II are provided with fixing holes that mate with large-diameter arc plate I and large-diameter arc plate II, respectively. The fixing holes mate with countersunk holes provided on large-diameter arc plate I and large-diameter arc plate II, respectively. Oil passage holes are provided on heating section I and heating section II.

2. The inspection fixture for spring-type parts according to claim 1, characterized in that, The central angle between the large-diameter arc plate I and the small-diameter arc plate I is 100 degrees, and the large-diameter arc plate I and the small-diameter arc plate I are coaxial arc plates.

3. The inspection fixture for spring-type parts according to claim 2, characterized in that, The central angle between the large-diameter arc plate II and the small-diameter arc plate II is 90 degrees, and the large-diameter arc plate II and the small-diameter arc plate II are coaxial arc plates.

4. The inspection fixture for spring-type parts according to claim 3, characterized in that, The diameter of the large-diameter arc plate I is not equal to the diameter of the small-diameter arc plate I, nor is the diameter of the large-diameter arc plate II.

5. The inspection fixture for spring-type parts according to claim 4, characterized in that, At the large diameter of the stepped shaft in the pressure rod and push rod, i.e., heating section I and heating section II, the temperature of the material is controlled by a flowing hot fluid, which indirectly controls the temperature of the upper and lower ends of the test piece; the materials of the pressure rod and push rod are both high thermal conductivity materials.

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