Small bolt twist-off force test assembly

Abstract

A small bolt twist-off force test assembly comprises a base and a test structure connected to the base, the base is provided with a plurality of holes, the test structure comprises a fixing part and an adjusting part, a test surface is formed between the fixing part and the adjusting part, and the test surface is provided with a plurality of through test holes parallel to the test surface. The small bolt twist-off force test assembly provided by the utility model has the advantages that the structure is simple, the installation of the bolt is fast, nuts do not need to be screwed at two ends of the bolt when the bolt is tested, a plurality of groups of bolts with different sizes can be tested at the same time, and the disassembly of bolt defective pieces after the test is completed is relatively simple.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt testing, in particular to a small bolt torsional fracture force testing component. Background Art

[0002] Bolts are applied in all walks of life. Their structure is simple and they are convenient to install and disassemble. Just tighten two nuts at both ends of the bolt to achieve fixation, which is suitable for scenarios with large lateral forces. At present, more and more industries have higher requirements for bolt performance, and the test standards for bolt anti-torsion and anti-shear are also getting higher. For the test of bolt anti-torsion, usually one end of the bolt is fixed by screwing a nut, and the other end is used with a test instrument to twist the bolt. When the bolt breaks, the value of the maximum anti-torsion force of the bolt is recorded.

[0003] For example, a utility model with the publication number CN214703099U in a Chinese patent proposes a bolt strength testing device. Two of the clamps are arranged above the base in a relative position. The rotary drive assembly is installed on one side of the base and drives one of the clamps to rotate. The upward force assembly is arranged below the clamp, and the thrust assembly is arranged at one end of the base far from the rotary drive assembly to push the clamp to move along the length direction of the base. The device of the utility model is provided with a rotary drive assembly, a clamp, an upward force assembly and a thrust assembly. Through the rotary drive assembly, one of the clamps can be driven to rotate, so that the torsional strength of the bolt can be tested. Through the upward force assembly, the compressive strength of the bolt can be tested. Through the thrust assembly, the tensile strength of the bolt can be tested. When the bolt strength testing device proposed by the utility model tests the torsional force of the bolt, it is necessary to install and disassemble a single bolt on the testing device, and still need to screw nuts at both ends of the bolt and then install it on the testing device during installation, and the efficiency is not high when continuously testing multiple groups of bolts. Content of the Utility Model

[0004] Aiming at the problems that when the current bolt testing device continuously tests multiple groups of bolts, it is necessary to install and disassemble the bolts multiple times, the efficiency is not high and the installation and disassembly processes are relatively cumbersome, the utility model proposes a small bolt torsional fracture force testing component, which has a simple structure, quick installation of bolts, does not require screwing nuts at both ends of the bolt when testing the bolt, and can simultaneously test multiple groups of bolts with different sizes. After the test is completed, the disassembly of the bolt residues is relatively simple.

[0005] In order to achieve the above object, the utility model adopts the following technical solutions:

[0006] The present utility model provides a small bolt breaking torque test assembly. The small bolt breaking torque test assembly includes a base and a test structure connected to the base. The base is provided with a plurality of holes. The test structure includes a fixing part and an adjusting part. A test surface is formed between the fixing part and the adjusting part. A through-shaped test hole is provided on the test surface and parallel to the test surface. A test surface is formed between the fixing part and the adjusting part of the test structure. The test surface has a through-shaped test hole for installing a bolt to be tested. The test hole is parallel to the test surface. The inner surface of the test hole is provided with threads that cooperate with the bolt to be tested. The bolt to be tested is installed and fixed in the test hole. The exposed part of the other end of the bolt to be tested can be used for breaking torque testing with a test device. And a plurality of test holes are provided on the test surface, and various thread specifications can be set according to actual needs, so that continuous testing can be carried out when testing the bolt to be tested.

[0007] Preferably, the fixing part includes a first fixture assembly. The first fixture assembly has a first test surface. A plurality of through-shaped first arc thread surfaces are provided on the first test surface. The adjusting part includes a second fixture assembly. The second fixture assembly has a second test surface. A plurality of through-shaped second arc thread surfaces corresponding to the first arc thread surfaces are provided on the second test surface. Through-shaped first arc thread surfaces and second arc thread surfaces are integrally formed on the first test surface and the second test surface. The threads on the first arc thread surface and the second arc thread surface correspond to each other.

[0008] Furthermore, at least two positioning protrusions are provided on the first test surface. At least two positioning depressions corresponding to the positioning protrusions are provided on the second test surface. At least two positioning protrusions are further provided on the first test surface. The two positioning depressions on the second test surface are arranged opposite to the positioning protrusions in terms of quantity and position. The positioning protrusions and the positioning depressions are used for quick positioning when the first test surface and the second test surface are fitted.

[0009] Furthermore, when the positioning protrusions and the positioning depressions are fixedly fitted, the first test surface and the second test surface are fixedly fitted, and the first arc thread surface and the second arc thread surface correspond to each other to form the test hole. After the positioning protrusions and the positioning depressions are fitted, the first test surface and the second test surface are simultaneously fitted, and the first arc thread surface and the second arc thread surface integrally formed on the first test surface and the second test surface accurately correspond to each other.

[0010] Optionally, the fixing part further includes a first fixture, the first fixture has a first docking surface, a docking protrusion is provided on the first docking surface, the first fixture assembly has a second docking surface disposed opposite to the first docking surface, a docking depression that cooperates with the first docking surface is provided on the second docking surface, and the first docking surface is fixedly engaged with the second docking surface. The docking protrusion on the first fixture is engaged with the docking depression on the first fixture assembly. While facilitating the disassembly and replacement of the fixture assembly, the cooperation between the docking protrusion and the docking depression prevents the first fixture assembly from experiencing horizontal displacement during use.

[0011] Furthermore, at least two through holes are provided on the top surface of the first fixture, through holes are provided on the top surface of the first fixture assembly, the first fixture is fixedly connected to the base through bolts passing through the through holes, and the first fixture assembly is fixedly connected to the base through bolts passing through the through holes. The split design of the first fixture and the first fixture assembly facilitates the disassembly and replacement of the fixture assembly.

[0012] Optionally, at least two through holes are provided on the top surface of the second fixture, and the second fixture is fixedly connected to the base through bolts passing through the through holes.

[0013] Furthermore, the adjusting part includes a second fixture, the second fixture is provided with a first limiting hole, the opening direction of the first limiting hole is perpendicular to the second test surface, the adjusting part further includes a limiting rod rotatably connected to the first limiting hole, the second fixture assembly is provided with a second limiting hole corresponding to the first limiting hole, and the limiting rod is partially placed in the second limiting hole and rotatably connected to the second fixture assembly. The second fixture is provided with a first limiting hole, the surface of the first limiting hole is provided with threads, the second fixture further includes a limiting rod threadedly connected to the first limiting hole, the side surface of the limiting rod is provided with threads, the limiting rod is partially disposed in the second limiting hole of the second fixture assembly, and by rotating the limiting rod, the limiting rod pushes the second fixture assembly to cooperate with the first fixture assembly through threaded connection with the first limiting hole, or loosens the fastening of the second fixture assembly.

[0014] The beneficial effects of the present utility model are:

[0015] A small bolt torque breakage force test assembly proposed by the present utility model does not require screwing nuts at both ends when installing the bolt to be tested, the installation steps are simple, multiple bolts to be tested with different sizes can be tested simultaneously, improving the efficiency, the debris generated during the test process is easy to clean, and the removal of the bolt residue after the test is relatively simple. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the released state of the small bolt torque breakage force test assembly.

[0017] Figure 2 It is an exploded view of a small bolt breaking torque test assembly.

[0018] Figure 3 It is a schematic diagram of some parts of a small bolt breaking torque test assembly.

[0019] Figure 4 is Figure 3 A schematic diagram of the parts in another orientation in

[0020] Figure 5 It is a schematic diagram of the clamping state of a small bolt breaking torque test assembly.

[0021] Reference numerals in the attached drawings:

[0022] 1. Base; 2. Fixed part; 3. Adjusting part; 4. Bolt; 5. Base connection hole; 6. Testing structure; 21. First fixture; 22. First fixture assembly; 31. Second fixture; 32. Second fixture assembly; 61. Testing surface; 62. Testing hole; 211. First docking surface; 212. Docking protrusion; 213. First fixture connection hole; 221. Second docking surface; 222. Docking depression; 223. Positioning protrusion; 224. First testing surface; 225. First arc thread surface; 226. First fixture assembly connection hole; 312. First limiting hole; 313. Limiting rod; 314. Second fixture connection hole; 322. Positioning depression; 323. Second testing surface; 324. Second arc thread surface; 325. Second limiting hole. Specific embodiments

[0023] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0024] The present utility model provides a small bolt breaking torque test assembly, and the following describes the preferred embodiments of the small bolt breaking torque test assembly.

[0025] Such as Figure 1As shown in the figure, the small bolt breaking torque test assembly includes a base 1 and a test structure 6 connected to the base. There are several base connection holes 12 on the base 1. The test structure 6 includes a fixing part 2 and an adjusting part 3. A test surface 61 is formed between the fixing part 2 and the adjusting part 3. There are several through test holes 62 on the test surface 7. The test holes 62 are formed by fixing the first fixture assembly 22 and the second fixture assembly 32 in the positions when testing the bolt to be tested, and opening along the joint surface of the first fixture assembly 22 and the second fixture assembly 32 and perpendicular to the top surface of the base 1, with a certain spacing between each test hole 62. In this embodiment, there are three screw holes of M5, M6, and M8 thread specifications arranged in sequence in the test holes 62. When testing the strength of the bolt to be tested, fix the corresponding model of the bolt to be tested into the test holes 62, and a torque wrench can be used to continuously test the nine bolts to be tested and record the values, with relatively high efficiency.

[0026] As Figure 2 shown in the figure, the fixing part 2 includes a first fixture assembly 22. The first fixture assembly 22 has a first test surface 224, and there are several through first arc thread surfaces 225 on the first test surface 224. The adjusting part 3 includes a second fixture assembly 32. The second fixture assembly 32 has a second test surface 323, and there are several through second arc thread surfaces 324 corresponding to the first arc thread surfaces 225 on the second test surface 323. After the first test surface 224 and the second test surface 323 are processed and formed, quenching treatment can be carried out. Since the hardness of the bolt to be tested is relatively large, quenching treatment of the components forming the test surface 61 can ensure the durability of the components.

[0027] As Figure 2 , Figure 3 and Figure 4As shown, the fixing part 2 includes a first fixture 21 and a first fixture assembly 22. On the top surface of the first fixture 21, there are two first fixture connection holes 213, both of which are through holes for passing bolts 4 to connect with corresponding base connection holes 5 on the base 1. One side surface of the first fixture 21 is machined into a first docking surface 211, and there are four angular docking protrusions 212 on the first docking surface 211. On the top surface of the first fixture assembly 22, there is a first fixture assembly connection hole 226, which is a through hole for passing bolts 4 to connect with corresponding base connection holes 5 on the base 1. One side surface of the first fixture assembly 22 is machined into a second docking surface 221, and there are four angular docking depressions 222 corresponding to the docking protrusions 212 on the first docking surface 211 on the second docking surface 221. On the side surface of the first fixture assembly 22 opposite to the second docking surface 221, it is machined into a first test surface 224. On the first test surface 224, there are 9 first arc thread surfaces 225 machined at a certain interval. The first arc thread surfaces 225 are perpendicular to the top surface of the first fixture assembly and penetrate the first test surface 224. The first arc thread surfaces 225 are composed of three threads of M5, M6, and M8 specifications each arranged at a certain interval. At each of the two end positions of the first test surface 224, there is an angular positioning protrusion 223. The protruding length of the positioning protrusion 223 is longer than that of the docking protrusion 212, and the angle of the tip is smaller. The top surface of the positioning protrusion 223 is an isosceles triangle, and the two side surfaces are perpendicular to the top surface.

[0028] The design of the docking protrusions 212 and the docking depressions 222 can facilitate the disassembly and replacement of the first fixture assembly 22, and at the same time prevent the first fixture assembly 22 from having horizontal displacement during use after installation. Under this design, only one connection hole needs to be opened on the first fixture assembly 22, which facilitates the disassembly and replacement of the first fixture assembly 22.

[0029] Such as Figure 2 、 Figure 3 and Figure 4As shown in the figure, the adjusting part 3 includes a second clamp 31 and a second clamp assembly 32. Two second clamp connection holes 314 are provided on the top surface of the second clamp 31. The second clamp connection holes 314 are all through holes for passing bolts 4 to be connected to the corresponding base connection holes 5 on the base 1; a first limiting hole 312 is provided on the side surface of the second clamp 31, and the inner wall of the first limiting hole is machined with threads; the second clamp 31 further includes a limiting rod 313. The limiting rod 313 is a threaded rod with threads corresponding to the first limiting hole 312 on the side surface, and the limiting rod 313 is threadedly connected to the first limiting hole 312. A second limiting hole 325 is provided on one side surface of the second clamp assembly 32. The second limiting hole 325 is a counterbore that can accommodate part of the limiting rod 313; the side surface of the second clamp assembly 32 opposite to the side surface where the second limiting hole 325 is located is machined into a second test surface 323, and nine second arc thread surfaces 324 corresponding to the first arc thread surface 225 are machined on the second test surface 323 at a certain interval; there is a corner-shaped positioning depression 322 corresponding to each of the two end segments of the second test surface 323 for the positioning protrusion 223. The shape of the positioning depression 322 is the same as that of the positioning protrusion 223. The fitting of the positioning depression 322 and the positioning protrusion 223 can achieve the quick positioning of the clamping of the first clamp assembly 22 and the second clamp assembly 32, so that the first arc thread surface 225 on the first test surface 224 and the second arc test surface 324 on the second test surface 323 are sequentially corresponding to form a complete test hole 62. The test hole 62 can be designed into a threaded hole with a variety of specification combinations according to the actual use scenario, and the paired first clamp assembly 22 and second clamp assembly 32 with test holes 62 of different specifications are replaced, which improves the flexibility of the small bolt breakage torque test assembly, and the first clamp assembly 22 and the second clamp assembly 32 are very convenient to disassemble and assemble during replacement. There is only one screw on the top of the first clamp assembly 22, and only one limiting rod 313 of the second clamp assembly 32 abuts against it. After disassembling the first clamp assembly 22 and the second clamp assembly 32, the other paired two assemblies are installed on the base 1 simply and quickly.

[0030] The cooperation of the positioning protrusion 223 and the positioning depression 322 not only makes the butt joint of the first arc thread surface 225 and the second arc thread surface 324 more accurate, but also simplifies the design of the limiting rod 313. Under this design, only one set of the first limiting hole 312, the second limiting hole 325 and the limiting rod 313 can realize the operations of positioning and clamping. If the positioning protrusion 223 and the positioning depression 322 are not used, at least two sets of the above-mentioned limiting holes and limiting rods are required to achieve the positioning purpose, but at this time, the operation of clamping the components becomes cumbersome and the accuracy is relatively low.

[0031] As Figure 2 shown, the manufacturing and installation process of the small bolt breakage torque test assembly is described:

[0032] The first fixture 21, the first fixture assembly 22, the second fixture 31 and the second fixture assembly 32 can be cut from the same metal sheet, which can ensure the fit between the first test surface 224 and the second test surface 323, and the fit between the first docking surface 211 and the second docking surface 221. Technologies such as wire cutting can be used to cut the first fixture 21, the first fixture assembly 22, the second fixture 31 and the second fixture assembly 32 from the same sheet, and the fit accuracy of the docking protrusion 212 and the docking recess 222, the positioning protrusion 223 and the positioning recess 322 is higher, and the positioning is more accurate. The cut first fixture assembly 22 and the second fixture assembly 32 are docked and positioned in the clamped state, and the two assemblies are clamped and fixed. Drill holes vertically downward along the gap formed by the first test surface 224 and the second test surface 323, at a certain distance from each other, and tap the through holes to form test holes 62; release the fixation of the first fixture assembly 22 and the second fixture assembly 32, the threaded surface on the first test surface 224 is the first arc threaded surface 225, and the threaded surface on the second fixture assembly 32 is the second arc threaded surface 324. Fix the second fixture 31 and the second fixture assembly 32 in the position when they are in the clamped state, open a hole in the center of the side surface of the second fixture 31 opposite to the second test surface 323, and continuously open the first limiting hole 312 and the second limiting hole 325. The first limiting hole 312 is a through hole, and threads are tapped on the surface. The second limiting hole 325 is a blind hole, and the bottom of the hole is processed flat. The limiting rod 313 is a rod with a thread matching the thread of the first limiting hole on its surface, or a screw can be directly used. Vertically open two threaded holes on the top surface of the first fixture 21, one threaded hole on the top surface of the first fixture assembly 22, and two threaded holes on the top surface of the second fixture 31. Press Figure 1As shown in the figure, five base connection holes 5 corresponding to the first fixture connection holes 213, the first fixture assembly connection holes 226, and the second fixture connection holes 314 are opened on the base 1 and processed into screw holes. Base connection holes 5 for connecting with the test structure 6 are opened on the base 1. Two bolts 4 are used to fixedly connect the second fixture 31 to the base 1, and two bolts 4 are used to fixedly connect the first fixture 21 to the base 1. The first docking surface 211 faces the second fixture 31; the second docking surface 221 of the first fixture assembly 22 is fitted with the first docking surface 211, and the docking protrusions 212 and the docking depressions 222 are docked one by one. One bolt 4 is used to fixedly connect the first fixture assembly 22 to the base 1; the screwing end of the limit rod 313 faces the first fixture assembly 22 and is screwed into the first limit hole 312 until the screwing end of the limit rod 313 exposes a sufficient length on the side of the first limit hole 312 close to the first fixture assembly 22. The second test surface 323 of the second fixture assembly 32 faces the second test surface 323 and is placed on the base 1. The second fixture assembly 32 is horizontally moved, and the positioning protrusion 223 and the positioning depression 322 are fitted. At this time, the first arc thread surface 225 and the second arc thread surface 324 correspond one by one to form a complete test hole 62, completing the fitting of the first test surface 224 and the second test surface 323. Then continue to tighten the limit rod 313, insert the screwing end of the limit rod 313 into the bottom of the second limit hole 325, and tighten the limit rod 313 to fix the second fixture assembly 32 to complete the installation.

[0033] As Figure 1 and Figure 5 shown, the usage process of the small bolt breakaway torque test assembly is described as follows:

[0034] As Figure 5 described, at this time, the small bolt breakaway torque test assembly is in a clamped state. Three small bolts of M5, M6, and M8 specifications are screwed into the test holes 62 of corresponding sizes. Each bolt to be tested is screwed to the bottom end of the test hole 62 or tightened to the tightest position. A torque wrench is used to perform the breakaway torque test on each bolt to be tested one by one, and the readings are recorded. Since the bolts to be tested need to be damaged during the test process and debris is likely to be generated when the bolts to be tested break, after all 9 bolts to be tested are completed, first use a cleaning tool to clean the surface of the test mechanism, and then rotate the limit rod to loosen it. At this time, the second fixture assembly is loosened. Continue to rotate the limit rod and move the second fixture assembly to a suitable position (as Figure 1 shown), the first test surface and the second test surface have been separated, and the bolt residues can be taken out; after taking out the bolt residues, clean the surface of the base, and tighten the limit rod to restore the second fixture assembly to the clamped state (as Figure 5 shown).

[0035] To cope with the increasingly complex product usage scenarios and ensure the usage requirements of the bolts used in the products, the small bolt breaking torque test assembly mentioned in the present utility model can achieve continuous testing of multiple bolts. Among them, multiple test holes with different models can ensure the consistency of the test conditions. The opening and closing of the assembly once can test multiple bolts, improving the test efficiency and having a positive impact on actual production.

[0036] In addition to the above embodiments, within the scope disclosed in the claims and the specification of the present utility model, the technical features of the present utility model can be reselected and combined to form new embodiments, which can be realized by those skilled in the art without creative labor. Therefore, these embodiments not specifically described in the present utility model should also be regarded as specific embodiments of the present utility model and within the protection scope of the present utility model.

Claims

1. A small bolt breaking torque test assembly, comprising a base and a test structure connected to the base, wherein a plurality of holes are provided on the base, and it is characterized in that, The test structure includes a fixing part and an adjusting part. A test surface is formed between the fixing part and the adjusting part. A plurality of through-shaped test holes are provided on the test surface and parallel to the test surface.

2. The small bolt breaking torque testing assembly according to claim 1, wherein The fixing part includes a first fixture assembly, which has a first test surface. A plurality of through-shaped first arc threaded surfaces are provided on the first test surface. The adjusting part includes a second fixture assembly, which has a second test surface. A plurality of through-shaped second arc threaded surfaces corresponding to the first arc threaded surfaces are provided on the second test surface.

3. The small bolt breaking torque test assembly according to claim 2, characterized in that, At least two positioning protrusions are further provided on the first test surface, and at least two positioning depressions corresponding to the positioning protrusions are provided on the second test surface.

4. A small bolt breaking force test assembly according to claim 3, characterized in that, When the positioning protrusions and the positioning depressions are fixedly engaged, the first test surface and the second test surface are fixedly engaged, and the first arc threaded surface and the second arc threaded surface correspond to each other to form the test holes.

5. A small bolt breaking torque test assembly according to any one of claims 2 or 3, characterized in that, The fixing part further includes a first fixture, which has a first docking surface. A docking protrusion is provided on the first docking surface. The first fixture assembly has a second docking surface opposite to the first docking surface. A docking depression matching the first docking surface is provided on the second docking surface. The first docking surface and the second docking surface are fixedly engaged.

6. A small bolt breaking torque test assembly according to claim 5, characterized in that, At least two through holes are provided on the top surface of the first fixture. The first fixture is fixedly connected to the base through bolts passing through the through holes. The first fixture assembly is fixedly connected to the base through bolts passing through the through holes.

7. A small bolt torque breakage force test assembly according to any one of claims 2 or 3, characterized in that At least two through holes are provided on the top surface of the second fixture. The second fixture is fixedly connected to the base through bolts passing through the through holes.

8. A small bolt breaking torque test assembly according to claim 7, characterized in that, The adjusting part includes a second fixture, which is provided with a first limiting hole. The opening direction of the first limiting hole is perpendicular to the second test surface. The adjusting part further includes a limiting rod rotatably connected to the first limiting hole. The second fixture assembly is provided with a second limiting hole corresponding to the first limiting hole. The limiting rod is partially placed in the second limiting hole and rotatably connected to the second fixture assembly.

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