Clamp for testing tensile strength

Abstract

The utility model relates to the technical field of detection clamps, in particular to a clamp for testing tensile strength, which comprises a mounting block and a limiting mechanism, a rotating shaft is rotationally connected into the mounting block; the limiting mechanism comprises a pull rod, an inserting block arranged on the pull rod, a fixing disc coaxially arranged on the pull rod and provided with three arc-shaped through holes, a plurality of threaded grooves distributed in the mounting block in an annular array mode and three second fixing bolts penetrating through the arc-shaped through holes and in threaded connection with the threaded grooves, and a rectangular groove is formed in one end of the rotating shaft; and the inserting block is rectangular and is matched with the rectangular groove. According to the utility model, the situation that the bolt body is damaged or the clamping is loosened when the high-lock bolt is tested can be avoided, and the fastening effect on the bolt is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to detection clamp technical field, in particular to a kind of clamps for tensile strength test. BACKGROUND

[0002] High lock bolt is a fastener, its main feature is the interference fit caused by the interference of bolt and nut and the combination of higher pre-tightening force to improve the joint fatigue strength, when installing, bolt is inserted from one side of hole, and the collar is tightened on the other side, when reaching certain tightening torque, the collar is broken from recessed groove part.

[0003] Chinese patent with publication number CN219161823U discloses a kind of high-strength bolt tensile strength detection clamp, including bolt main body, the lower side of bolt main body is connected with nut by screw thread outside, the two sides of bolt main body are all provided with clamp main body, the side of two groups of clamp main body is all provided with adjusting limiting mechanism, the adjusting limiting mechanism includes limit block, the two sides of two groups of clamp main body are all clamped with limit block, and the recess of limit block is set in clamp main body interior and cooperates, the end of two sides limit block is all fixedly connected with limiting plate, the interior of two groups of clamp main body is all movably connected with threaded rod. The device of this test clamp is more flexible as a whole, can be adjusted, to meet the detection of different specifications of bolt, and it is convenient and fast when adjusting, increase the flexibility and convenience of device as a whole.

[0004] However, the above technical solution has the following deficiencies: the device is screwed with the limit block by the threaded rod, and the limit block drives the limiting plate to clamp the bolt body, this mode lacks the limitation of the axial rotation of the threaded rod when performing tensile test, so that the shear stress generated during stretching may cause the threaded rod to deflect, thereby causing the bolt body to be damaged or clamped loose, affecting the accuracy of test results. UTILITY MODEL CONTENTS

[0005] The utility model aims at the problems in the background art, and provides a kind of clamp for tensile strength test, can avoid the bolt body to be damaged or clamped loose when testing high lock bolt, guarantee the fastening effect of bolt.

[0006] The technical scheme of the utility model, a kind of clamp for tensile strength test, including mounting block and limiting mechanism;Rotatably connected with the pivot in the interior of mounting block;Limiting mechanism includes pull rod, the insert block being set on pull rod, the fixed disc being coaxially set on pull rod and having three arc-shaped through holes, a plurality of annular array distribution screw grooves on mounting block, and three second fixed bolts passing through arc-shaped through hole and being screw thread connected with screw groove, the one end of pivot is provided with rectangular slot, and the shape of insert block is rectangle and mutually adapts with rectangular slot.

[0007] Preferably, the rotating shaft is provided with a first threaded part and a second threaded part with opposite screw directions.

[0008] Preferably, a limiting ring is coaxially arranged on the rotating shaft and rotatably arranged in the mounting block.

[0009] Preferably, the mounting block is provided with a clamping mechanism, the clamping mechanism comprises two moving plates which are symmetrically distributed and respectively threadedly connected with the rotating shaft, a clamping block arranged on the moving plate, two guide blocks arranged on the moving plate, and a transmission assembly for driving the rotating shaft to rotate, and the mounting block is internally provided with a sliding groove for sliding of the guide blocks.

[0010] Preferably, the clamping block is provided with a fixing block, a first fixing bolt is arranged through the fixing block, and the first fixing bolt is threadedly connected with the moving plate.

[0011] Preferably, the transmission assembly comprises a fixing frame arranged on the mounting block, a rotating rod rotatably connected with the fixing frame, a first gear and a second gear coaxially arranged on the rotating shaft and the rotating rod respectively, and the first gear and the second gear are meshingly connected.

[0012] Preferably, the rotating rod is provided with a handle and two protruding rings distributed along the axial direction, and the two protruding rings are respectively in abutment with the two sides of the fixing frame.

[0013] Preferably, the mounting block is provided with a connecting ring for fixing installation.

[0014] Compared with the prior art, the utility model has the advantages of the following beneficial technical effects:

[0015] 1. The limiting mechanism can prevent the axial rotation direction of the rotating shaft from being locked, avoid the situation that the clamping effect is loosened or the high-lock bolt is abraded due to the shear stress in the stretching process, ensure the accuracy of the test result, and has good practicability.

[0016] 2. The clamping mechanism can quickly and stably clamp the high-lock bolt, the fixing block and the first fixing bolt are cooperatively arranged, the clamping block can be replaced, the clamping block can clamp high-lock bolts with different sizes, and the applicability range of the clamp is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of an embodiment of the utility model;

[0018] Figure 2 is a sectional structural schematic view of a mounting block;

[0019] Figure 3 is an internal structural connection schematic view of a clamping mechanism;

[0020] Figure 4 This is a schematic diagram showing the separation of the limiting mechanism and the rotating shaft.

[0021] Reference numerals: 1. Mounting block; 2. Rotating shaft; 3. First threaded part; 4. Second threaded part; 5. Limiting ring; 6. First gear; 7. Fixing frame; 8. Rotating rod; 9. Second gear; 10. Handle; 11. Protruding ring; 12. Moving plate; 13. Clamping block; 14. Guide block; 15. Slide groove; 16. Fixing block; 17. First fixing bolt; 18. Rectangular groove; 19. Threaded groove; 20. Pull rod; 21. Fixing plate; 22. Insert block; 23. Second fixing bolt; 24. Connecting ring. Detailed Implementation

[0022] Example 1

[0023] like Figures 1-4 As shown, this embodiment proposes a tensile strength testing fixture, including a mounting block 1 and a limiting mechanism. A rotating shaft 2 is rotatably connected inside the mounting block 1. A connecting ring 24 for fixed mounting is provided on the mounting block 1, and the connecting ring 24 is used to fix the mounting block 1 to a driving device (not shown) that drives the mounting block 1 to move. The rotating shaft 2 is provided with a first threaded portion 3 and a second threaded portion 4 with opposite thread directions. A limiting ring 5 is coaxially provided on the rotating shaft 2, rotatably disposed inside the mounting block 1. The limiting ring 5 is used to limit the axial position of the rotating shaft 2, ensuring stability during rotation.

[0024] like Figure 1 , Figure 2 and Figure 4 As shown, the limiting mechanism includes a pull rod 20, an insert block 22 disposed on the pull rod 20, a fixed plate 21 coaxially disposed on the pull rod 20 and having three arc-shaped through holes, multiple threaded grooves 19 distributed in a ring array on the mounting block 1, and three second fixing bolts 23 that penetrate the arc-shaped through holes and are threadedly connected to the threaded grooves 19. One end of the rotating shaft 2 is provided with a rectangular groove 18, and the insert block 22 is rectangular in shape and is adapted to the rectangular groove 18.

[0025] In this embodiment, after the high-strength bolt is clamped, the angle of the insert 22 is adjusted by rotating the pull rod 20 so that the insert 22 can be inserted into the rectangular groove 18 of the rotating shaft 2. The axial rotation of the rotating shaft 2 is achieved by the cooperation between the rectangular insert 22 and the rectangular groove 18, thus locking the shaft and preventing the shear stress during the stretching process from causing the clamping effect to loosen or the high-strength bolt to wear, ensuring the accuracy of the test results. Then, the three second fixing bolts 23 are passed through the three arc-shaped through holes and screwed into the corresponding threaded grooves 19 on the mounting block 1 until the second fixing bolts 23 press the fixing plate 21 tightly against the outer wall of the mounting block 1, thus completing the restriction of the rotating shaft 2. The operation is simple and convenient and has good practicality.

[0026] Embodiment two

[0027] As Figure 1 and Figure 2 shown, the embodiment proposes a tensile strength test fixture, compared with embodiment one, in the embodiment, the mounting block 1 is provided with a clamping mechanism, the clamping mechanism two symmetrically distributed and respectively with the threaded connection of the moving plate 12 of the rotating shaft 2, the clamping block 13 arranged on the moving plate 12, two guide blocks 14 arranged on the moving plate 12, and the transmission assembly for driving the rotating shaft 2 to rotate, the inside of the mounting block 1 is provided with a sliding groove 15 for the guide block 14 to slide, the clamping block 13 is provided with a fixed block 16, the first fixed bolt 17 is arranged through the fixed block 16, the first fixed bolt 17 is threadedly connected with the moving plate 12, the fixed block 16 and the first fixed bolt 17 are arranged for mounting and dismounting the clamping block 13, and the clamping block 13 with different clamping diameters is replaced to adapt to high lock bolts with different sizes.

[0028] The transmission assembly comprises a fixed frame 7 arranged on the mounting block 1, a rotating shaft 8 rotatably connected to the fixed frame 7, a first gear 6 and a second gear 9 coaxially arranged on the rotating shaft 2 and the rotating shaft 8 respectively, the first gear 6 and the second gear 9 are meshed and connected, the rotating shaft 8 is provided with a handle 10 and two protruding rings 11 distributed along the axial direction, the two protruding rings 11 are respectively in abutment with the two sides of the fixed frame 7, the protruding rings 11 are used for mounting the rotating shaft 8 on the fixed frame 7, and the two protruding rings 11 limit the axial position of the rotating shaft 8.

[0029] In the embodiment, when the high lock bolt needs to be clamped, the nut is screwed on the screw rod for a distance, then the upper and lower parts of the screw rod of the bolt are respectively arranged between the clamping blocks 13 on the two sides, the handle 10 is rotated to rotate the rotating shaft 8, the second gear 9 is screwed with the first gear 6, then the first gear 6 drives the rotating shaft 2 to rotate, and under the guidance of the guide block 14, the first threaded part 3 and the second threaded part 4 of the rotating shaft 2 are respectively screwed with the two moving plates 12, then the two moving plates 12 drive the clamping blocks 13 to approach each other, until the screw rod of the bolt is clamped, and then the tensile strength test can be carried out, which is simple and convenient to operate.

[0030] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to this, within the knowledge range possessed by the person skilled in the art, various changes can be made without departing from the purpose of the utility model.

Claims

1. A tensile strength test fixture characterized by, The utility model relates to a kind of installation block (1), the inside rotatory connection has rotating shaft (2);Limit mechanism, including pull rod (20), the plug-in block (22) being set on pull rod (20), the fixed disc (21) being coaxially set on pull rod (20) and having three arc-shaped through holes, a plurality of annular array distribution screw grooves (19) on installation block (1), and three second fixed bolts (23) passing through arc-shaped through hole and being screw thread connection with screw groove (19), one end of rotating shaft (2) is provided with rectangular slot (18), the shape of plug-in block (22) is rectangular and mutually adapted with rectangular slot (18). Rotating shaft (2) is provided with first threaded portion (3) and second threaded portion (4) of opposite screw thread direction. Rotating shaft (2) is coaxially provided with limit ring (5), limit ring (5) is rotatoryly arranged in the inside of installation block (1).

2. The tensile strength testing fixture of claim 1, wherein, Installation block (1) is provided with clamping mechanism, clamping mechanism includes two symmetrical distribution and respectively with rotating shaft (2) screw thread connection moving plate (12), the clamping block (13) being set on moving plate (12), two guide blocks (14) being set on moving plate (12), and the transmission assembly for driving rotating shaft (2) rotation, the inside of installation block (1) is provided with sliding slot (15) for the sliding of guide block (14).

3. The tensile strength testing fixture of claim 1, wherein, Clamping block (13) is provided with fixed block (16), first fixed bolt (17) is passed through and set on fixed block (16), and first fixed bolt (17) and moving plate (12) are screw thread connection.

4. The tensile strength testing fixture of claim 1, wherein, Transmission assembly includes fixed frame (7) being set on installation block (1), rotatory connection is established in fixed frame (7) on rotating lever (8), first gear (6) and second gear (9) are coaxially set on rotating shaft (2) and rotating lever (8) respectively, and first gear (6) and second gear (9) are engaged connection.

5. The tensile strength testing fixture of claim 4, wherein, Rotating lever (8) is provided with handle (10) and two axially distributed convex rings (11), and two convex rings (11) are respectively with the two sides of fixed frame (7) mutually abutted.

6. The tensile strength testing fixture of claim 4, wherein, Installation block (1) is provided with connecting ring (24) for fixed installation.

7. A tensile strength testing fixture according to claim 6, wherein, ​ 8. The tensile strength testing fixture of claim 1, wherein, ​

Images