A fast-clamping fastener tensile test aid

Abstract

The invention discloses a fast-clamping fastener tensile test auxiliary tool, comprising a bolt sleeve, an upper quick loader, a bolt tension head, and a lower quick loader. The upper end of the bolt sleeve is connected to the upper pulling head of the testing machine through the upper quick loader, and the bolt tension head is connected to the lower pulling head of the testing machine through the lower quick loader. A limiting hole is provided at the center of the lower end of the bolt sleeve, and the limiting hole is used to limit the head of the bolt. A threaded hole is provided on the bolt tension head corresponding to the limiting hole, and the threaded hole is used to connect the rod of the bolt. The invention is easy, accurate, and fast to operate, makes up for the problem that a universal material testing machine cannot be used directly for testing, and has high versatility.

Description

Technical Field

[0001] The invention belongs to an auxiliary tool for bolt test detection, in particular to a fast-clamping fastener tensile test auxiliary tool. Background Art

[0002] In the production of threaded fasteners, the mechanical properties of fasteners are a very important performance indicator. During production, threaded fasteners must be subjected to tensile tests to verify whether the fasteners meet the mechanical properties. The inspection of mechanical properties needs to be carried out using a tensile testing machine.

[0003] The main shortcomings of using a tensile testing machine to test threaded fasteners are as follows: 1) Unable to clamp: The upper and lower clamps of the existing testing machine can only perform clamping tests on standard samples specified by the state, and there are limitations for rod-shaped bolts with certain shapes. For example, a hexagonal head washer bolt cannot clamp the head because there is a gasket on the head of the bolt; 2) The tensile direction is not perpendicular to the bolt support surface: According to the use requirements of threaded fasteners, the tensile test requires that the tensile direction of the force is perpendicular to the bolt support surface. Using a clamp to clamp cannot ensure that the tensile force direction is perpendicular to the support surface. Summary of the invention

[0004] The invention provides a fast-clamping fastener tensile test auxiliary tool, which solves the problems of the existing testing machine that the chuck cannot clamp the bolt and the detection accuracy is low.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a quick-clamping fastener tensile test auxiliary tool, characterized in that: it includes a bolt sleeve, an upper quick loader, a bolt tensile head, and a lower quick loader, the upper end of the bolt sleeve is connected to the upper pulling head of the testing machine through the upper quick loader, and the bolt tensile head is connected to the lower pulling head of the testing machine through the lower quick loader; a limiting hole is provided at the center of the lower end of the bolt sleeve, the limiting hole is used to limit the head of the bolt, and a threaded hole is provided on the bolt tensile head corresponding to the limiting hole, and the threaded hole is used to connect the rod of the bolt.

[0006] The above technical solution is further limited. The upper quick-installer includes an upper connecting piece, an upper semicircular sleeve, an upper sleeve, and a threaded head. The upper end of the upper connecting piece is connected to the upper pulling head of the testing machine by a threaded structure. The lower end of the upper connecting piece is limited within the upper end of the upper semicircular sleeve. The upper end of the threaded head is limited within the lower end of the upper semicircular sleeve. The upper sleeve and the upper semicircular sleeve can clamp the upper connecting piece and the threaded head after interference fit. The lower end of the threaded head is connected to the bolt sleeve by a threaded structure.

[0007] The above technical solution is further limited in that the upper sleeve and the upper semicircular sleeve achieve interference fit through a conical surface.

[0008] The above technical solution is further limited. The lower quick-installer includes a lower connecting piece, a lower semicircular sleeve, and a lower sleeve. The lower end of the lower connecting piece is connected to the lower pull head of the testing machine by a threaded structure. The upper end of the lower connecting piece is limited in the lower end of the lower semicircular sleeve, and the lower end of the bolt tension head is limited in the upper end of the lower semicircular sleeve. The lower sleeve and the lower semicircular sleeve can clamp the lower connecting piece and the bolt tension head after interference fit.

[0009] The above technical solution is further limited in that the lower sleeve and the lower semi-circular sleeve achieve interference fit through a conical surface.

[0010] Beneficial effects: The support plane of the bolt sleeve is in surface contact with the lower end surface of the bolt head for positioning support, so as to ensure that the axial direction of the bolt extends in the up and down directions, thereby ensuring the result; by adding a quick loader, the existing testing machine can be transformed into a special bolt testing machine, which is also convenient for clamping the test piece; the present invention is easy, accurate and fast to operate, which makes up for the problem that a universal material testing machine cannot be used directly for testing, and has high versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0012] like Figure 1 As shown, a fast-clamping fastener tensile test auxiliary device includes a bolt sleeve 1, an upper quick-installer 2, a bolt tension head 3, and a lower quick-installer 4. The upper end of the bolt sleeve is connected to an upper pull head 5 of a testing machine through the upper quick-installer, and the bolt tension head is connected to a lower pull head 6 of the testing machine through the lower quick-installer. A limiting hole is provided at the center of the lower end of the bolt sleeve, and the limiting hole is used to limit the head of the bolt. A threaded hole is provided on the bolt tension head corresponding to the limiting hole, and the threaded hole is used to connect the rod of the bolt.

[0013] like Figure 1As shown, the upper quick-installer 2 includes an upper connecting piece 201, an upper semicircular sleeve 202, an upper sleeve 203, and a threaded head 204. The upper end of the upper connecting piece is connected to the upper pulling head of the testing machine by a threaded structure. The lower end boss of the upper connecting piece is limited in the upper end of the upper semicircular sleeve, and the upper end boss of the threaded head is limited in the lower end of the upper semicircular sleeve. The upper sleeve and the upper semicircular sleeve can clamp the upper connecting piece and the threaded head after interference fit, that is, the upper connecting piece, the upper semicircular sleeve, the upper sleeve, and the threaded head constitute an integrated structure, and the lower end of the threaded head is connected to the bolt sleeve by a threaded structure. Advantages of the structure: 1) The threaded connection method is convenient for loading and unloading and adjusting the distance; 2) The semicircular sleeve refers to: the truncated cone is cut in half along the axial direction and the cross section is semicircular, and a limiting cavity is provided inside the semicircular cone, so that rapid limiting can be achieved; 3) The upper sleeve and the upper semicircular sleeve are interference fit through the conical surface, that is, the cylinder surface (conical surface) of the upper sleeve matches the outer surface of the upper semicircular sleeve, so that rapid clamping can be achieved; 4) The upper connector or threaded head can be replaced according to the length of the part, so that it can adapt to bolts of different lengths for testing, and has high versatility;

[0014] like Figure 1 As shown, the lower quick-installer 4 includes a lower connecting piece 401, a lower semicircular sleeve 402, and a lower sleeve 403. The lower end of the lower connecting piece is connected to the lower pull head of the testing machine by a threaded structure. The upper end of the lower connecting piece is limited in the lower end of the lower semicircular sleeve, and the lower end of the bolt tension head is limited in the upper end of the lower semicircular sleeve. The lower sleeve and the lower semicircular sleeve can clamp the lower connecting piece and the bolt tension head after interference fit; 1) The threaded connection method is convenient for loading and unloading and adjusting the distance; 2) The semicircular sleeve refers to: a truncated cone is cut in half along the axial direction and has a semicircular cross section, and a limiting cavity is provided in the semicircular cone, so that rapid limiting can be achieved; 3) The lower sleeve and the lower semicircular sleeve are interfered by a conical surface, that is, the barrel surface (conical surface) of the upper sleeve matches the outer surface of the lower semicircular sleeve, so that rapid clamping is achieved.

[0015] Instructions for use of the present invention: When testing bolts, remove the original chuck on the testing machine and replace it with the auxiliary tool described in the present invention: 1) The upper end of the upper connecting piece is connected to the upper pull head of the testing machine, the upper sleeve is sleeved on the upper connecting piece, the lower end of the upper connecting piece and the upper end of the threaded head are both stuck in the upper semicircular sleeve, and the upper sleeve is lowered to have an interference fit with the upper semicircular sleeve; 2) The lower end of the lower connecting piece is connected to the lower pull head of the testing machine, the upper end of the lower connecting piece is stuck in the upper semicircular sleeve, and the lower sleeve is installed to have an interference fit with the lower semicircular sleeve; 3) Select a suitable bolt Sleeve, install the bolt 7 to be measured into the bolt sleeve, connect the threaded end of the bolt with the bolt tensile head, and screw in a length of not less than one thread diameter; 4) Connect the threaded end of the bolt sleeve with the threaded head; 5) Lift up the sleeve on the lower semicircular sleeve and loosen the lower semicircular sleeve; adjust the lifting system of the testing machine, insert the other end of the bolt tensile head into the lower semicircular sleeve, lower the sleeve on the lower semicircular sleeve, and screw the bolt, bolt tensile head and lower connecting piece together to make the parts contact with each other to prevent the bolt from moving up and down; 6) Perform a tensile test.

[0016] Parts not described in detail in this specification are technologies known in the art or their structures are clearly shown in the drawings.

Claims

1. A fast-clamping fastener tensile test auxiliary tool, comprising a bolt sleeve, an upper quick-installer, a bolt tensile head, and a lower quick-installer, wherein the upper end of the bolt sleeve is connected to the upper pull head of the test machine through the upper quick-installer, and the bolt tensile head is connected to the lower pull head of the test machine through the lower quick-installer; a limiting hole is provided at the center of the lower end of the bolt sleeve, the limiting hole is used to limit the head of the bolt, and a threaded hole is provided on the bolt tensile head corresponding to the limiting hole, and the threaded hole is used to connect the rod of the bolt; the characteristics are: The upper quick-installer includes an upper connecting piece, an upper semicircular sleeve, an upper sleeve, and a threaded head. The upper end of the upper connecting piece is connected to the upper pulling head of the testing machine by a threaded structure, the lower end of the upper connecting piece is limited within the upper end of the upper semicircular sleeve, and the upper end of the threaded head is limited within the lower end of the upper semicircular sleeve. The upper sleeve and the upper semicircular sleeve can be clamped after interference fit, and the lower end of the threaded head is connected to the bolt sleeve by a threaded structure; the upper sleeve and the upper semicircular sleeve achieve interference fit through a conical surface.

2. A fast-clamping fastener tensile test aid according to claim 1, characterized in that: The lower quick-installer includes a lower connecting piece, a lower semicircular sleeve, and a lower sleeve. The lower end of the lower connecting piece is connected to the lower pull head of the testing machine by a threaded structure. The upper end of the lower connecting piece is limited in the lower end of the lower semicircular sleeve, and the lower end of the bolt tension head is limited in the upper end of the lower semicircular sleeve. The lower sleeve and the lower semicircular sleeve can clamp the lower connecting piece and the bolt tension head after interference fit.

3. A fast-clamping fastener tensile test aid according to claim 2, characterized in that: The lower sleeve and the lower semicircular sleeve are interference fit through the conical surface.

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