CN212932172U

CN212932172U - Clamp for bolt tensile test

Info

Publication number: CN212932172U
Application number: CN202021997412.4U
Authority: CN
Inventors: 杜海玉; 许叶
Original assignee: China Kun Testing Technology Services Co ltd
Current assignee: China Kun Testing Technology Services Co ltd
Priority date: 2020-09-12
Filing date: 2020-09-12
Publication date: 2021-04-09
Anticipated expiration: 2030-09-12

Abstract

The application relates to a bolt tensile test is with anchor clamps, it includes locating hole, locking hole, screw rod and sleeve, still includes the holding ring, and locating hole and locking hole are all seted up on the inner wall of holding ring. This application has the life's of extension anchor clamps effect.

Description

Clamp for bolt tensile test

Technical Field

The application relates to the field of bolt tensile detection, in particular to a clamp for bolt tensile test.

Background

When the bolt is subjected to tensile detection, a special clamp is generally used for fixing the bolt body and the bolt cap body of the bolt respectively, and then a tensile testing machine is used for stretching the bolt body and the bolt cap body of the bolt through the clamp, so as to apply force along the axial direction of the bolt, and further detect the tensile strength of the bolt.

The structure of a clamp for detecting the tensile strength of a bolt is shown in fig. 1, and the clamp comprises a positioning cylinder 5 for locking the bolt 4, wherein the positioning cylinder 5 is a rectangular cylinder. The axis of the positioning cylinder 5 is arranged along the horizontal direction, the top surface of the positioning cylinder 5 is provided with a locking hole 11, a screw 111 can be inserted into the locking hole 11, and one end of the screw 111 facing the axis of the positioning cylinder 5 is sleeved with a screw cap 51. The bottom surface of the positioning cylinder 5 is provided with a positioning hole 12, and the side wall of the positioning hole 12 is communicated with one end of the positioning cylinder 5.

When the clamp is used for detecting the bolt, the bolt slides into the positioning hole, the head of the bolt is arranged in the positioning cylinder, and the rod body of the bolt is sleeved with the sleeve with the internal thread. Two clamping devices of the tensile testing machine respectively clamp one end of the screw rod and one end of the sleeve, which are opposite to the positioning cylinder, so that tensile force can be applied to the bolt along the axis direction of the bolt, and the tensile strength of the bolt can be detected.

With respect to the related art in the above, the inventors consider that: when the clamp is used practically, the positioning hole of the clamp is communicated with the end face of the positioning cylinder, so that the side wall of the positioning cylinder, provided with the positioning hole, is easy to bend when the bolt is stretched, and the service life of the clamp is shortened.

SUMMERY OF THE UTILITY MODEL

In order to prolong the service life of the clamp, the application provides a clamp for bolt tensile test.

The application provides a bolt anchor clamps for tensile test adopts following technical scheme:

the clamp for the bolt tensile test comprises a positioning hole, a locking hole, a screw rod, a sleeve and a positioning ring, wherein the positioning hole and the locking hole are formed in the inner wall of the positioning ring.

By adopting the technical scheme, the positioning hole and the locking hole are formed in the positioning ring, when the bolt is stretched, the bolt is arranged in the positioning hole in a penetrating mode, and the sleeve is sleeved on the rod body of the bolt. And then, a screw is placed in the locking hole, after the clamp is arranged on a tensile testing machine, two clamping devices of the tensile testing machine respectively clamp the screw and the sleeve, and the bolt is stretched. Because the end surfaces of the positioning hole and the positioning ring are not communicated, the deformation resistance of the positioning ring can be improved, the possibility of bending the side surface of the positioning ring provided with the positioning hole is further reduced, and the service life of the clamp is prolonged.

Preferably, the inner wall of the positioning ring is provided with a limiting cylinder for limiting the rotation of the bolt cap body, the inner wall of the limiting cylinder abuts against the side face of the bolt cap body, and the axis of the limiting cylinder coincides with the axis of the positioning hole.

By adopting the technical scheme, the bolt is prevented from rotating by the limiting cylinder, the worker places the cap body of the bolt in the limiting cylinder, the cap body is tightly abutted to the inner wall of the limiting cylinder, the bolt can be prevented from rotating, and the worker can conveniently sleeve the sleeve on the bolt.

Preferably, the number of the limiting cylinders is a plurality, the maximum width of the inner side wall of each limiting cylinder is different, and the height of each limiting cylinder is greater than that of the previous limiting cylinder in the direction away from the positioning hole.

Through adopting above-mentioned technical scheme, set up a plurality of spacing section of thick bamboo, can utilize this anchor clamps to press from both sides the multiple bolt of adorning different nominal diameters. After the bolt penetrates into the positioning hole, the side face of the cap body of the bolt is attached to the inner wall of the corresponding limiting cylinder, so that the bolt is prevented from rotating. Meanwhile, the end face of the cap body of the bolt facing the nail body is abutted against the inner wall of the limiting cylinder or the positioning ring with a smaller circumscribed circle diameter.

Preferably, the inner side of the limiting cylinder is provided with a support ring, and the outer side wall of the support ring is abutted to the inner side wall of the corresponding limiting cylinder.

Through adopting above-mentioned technical scheme, utilize the support ring can assist the cap body of the less spacing section of thick bamboo supporting bolt of circumscribed circle diameter, reduce the compressive stress that a spacing section of thick bamboo received, reduce the possibility of a spacing section of thick bamboo damage.

Preferably, the bottom end of the sleeve is closed.

Through adopting above-mentioned technical scheme, seal the setting with telescopic bottom, when using tensile test machine to test the bolt, tensile test machine's holder can press from both sides the sleeve confined one end to reduce the possibility that the holder damaged the bolt body of rod in the sleeve.

Preferably, the outer side surface of the sleeve is provided with at least one pair of auxiliary grooves, and the groove bottoms of the two auxiliary grooves in the same pair are parallel to each other.

Through adopting above-mentioned technical scheme, set up the auxiliary tank, when tensile bolt leads to telescopic screw thread and the screw thread interference fit of bolt, can utilize two auxiliary tanks of adjustable spanner centre gripping to demolish the sleeve from the bolt.

Preferably, the outer side wall of the sleeve is sleeved with a rubber sleeve.

Through adopting above-mentioned technical scheme, the cover is established the rubber sleeve on the sleeve, can make things convenient for the staff to establish the sleeve cover on the body of rod of bolt, and the rubber sleeve can reduce the possibility of sleeve slippage.

Preferably, the locking hole is a threaded hole.

Through adopting above-mentioned technical scheme, set up the locking hole into the screw hole for screw-thread fit between screw rod and the locking hole can no longer use nut and screw rod cooperation, and with the position of locking screw rod, can play reduce cost's effect.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by arranging the positioning ring and the positioning hole, the possibility of bending the side surface of the positioning ring provided with the positioning hole can be reduced, and the service life of the clamp can be prolonged;

2. by arranging the limiting cylinder, the effect that workers can conveniently sleeve the sleeve on the bolt can be achieved;

3. through the bottom closed setting with the sleeve, can play the effect that reduces the holder and damage the possibility of the bolt body of rod in the sleeve.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a clamp for testing the tensile strength of a bolt in the prior art;

FIG. 2 is a schematic diagram of the overall structure of an embodiment of the present application;

fig. 3 is a schematic view of the connection structure of the limiting cylinder and the positioning ring in the embodiment of the application.

Description of reference numerals: 1. a positioning ring; 11. a locking hole; 111. a screw; 12. positioning holes; 2. a limiting cylinder; 21. a first limiting cylinder; 211. a first support ring; 22. a second limiting cylinder; 221. a second support ring; 23. a third limiting cylinder; 24. a support ring; 3. a sleeve; 31. a rubber sleeve; 32. an auxiliary groove; 4. a bolt; 5. a positioning cylinder; 51. and (4) a nut.

Detailed Description

The present application is described in further detail below with reference to figures 2-3.

The embodiment of the application discloses anchor clamps are used in bolt tensile test. Referring to fig. 1, the clamp for the bolt tension test comprises a rectangular positioning ring 1, a locking hole 11 is formed in the top end of the inner wall of the positioning ring 1, a positioning hole 12 is formed in the bottom end of the inner wall of the positioning ring 1, and the axis of the positioning hole 12 coincides with the axis of the locking hole 11.

Referring to fig. 1, the locking hole 11 is a threaded hole, and when the clamp is used, a screw 111 needs to be inserted into the locking hole 11, and one end of the side surface of the screw 111 facing the inside of the positioning ring 1 is threaded. When the jig is used, it is only necessary to insert the screw 111 into the locking hole 11, and the screw 111 is screw-engaged with the locking hole 11. When performing a tensile test, a gripper clamping screw 111 of the tensile tester extends beyond a section of the positioning ring 1.

Referring to fig. 1 and 2, the inner wall of the positioning ring 1 provided with the positioning hole 12 is welded with three limiting cylinders 2, namely a first limiting cylinder 21, a second limiting cylinder 22 and a third limiting cylinder 23, which are sequentially sleeved, and the cross sections of the three limiting cylinders 2 are hexagonal. The diameter of the circumscribed circle of three spacing section of thick bamboo 2 increases in proper order, and the axis of three spacing section of thick bamboo 2 all coincides with the axis of locating hole 12, and two adjacent spacing section of thick bamboos 2 still laminate mutually.

Referring to fig. 1 and 2, along the direction far away from the axis of the positioning hole 12, the diameters of the circumscribed circles of the first limiting cylinder 21, the second limiting cylinder 22 and the third limiting cylinder 23 are sequentially increased, and the heights of the first limiting cylinder 21, the second limiting cylinder 22 and the third limiting cylinder 23 are also sequentially increased. When the bolt 4 is inserted into the positioning hole 12, the side face of the cap body of the bolt 4 is attached to the inner side wall of the third limiting cylinder 23, different bolts 4 are tested in practical use, and the side face of the cap body of the bolt 4 can also be attached to the inner side wall of the first limiting cylinder 21 or the second limiting cylinder 22.

Referring to fig. 1 and 2, support rings 24 are embedded in the inner sides of the first limiting cylinder 21 and the second limiting cylinder 22, each support ring 24 comprises a first support ring 211 and a second support ring 221, the first support ring 211 is located on the inner side of the first limiting cylinder 21, the outer side wall of the first support ring 211 is attached to the inner side wall of the first limiting cylinder 21, and the end surface of the first support ring 211 abuts against the inner side wall of the positioning ring 1; the second support ring 221 is located on the inner side of the second limit cylinder 22, the outer side wall of the second support ring 221 is attached to the inner side wall of the second limit cylinder 22, and the end face, back to the positioning ring 1, of the second support ring 221 abuts against the first support ring 211 and the first limit cylinder 21.

Referring to fig. 1 and 2, the shapes of the inner holes of the first support ring 211 and the second support ring 221 are circular, the diameters of the inner holes of the first support ring 211 and the second support ring 221 are coincident with the axis of the positioning hole 12, and the diameters of the inner holes of the first support ring 211 and the second support ring 221 are the same as the diameter of the positioning hole 12, so that rod bodies of bolts 4 with different diameters can penetrate through the inner holes of the first support ring 211 and the second support ring 221.

Referring to fig. 1, the body of the bolt 4 passes through the positioning hole 12, and when a tensile test is required, the bolt 4 is further required to be sleeved with the sleeve 3 with an internal thread. The inner hole one end of sleeve 3 communicates with the terminal surface of sleeve 3, and the other end seals the setting, has seted up the internal thread on the inner wall of sleeve 3. When carrying out tensile test, the side of 3 blind ends of tensile test machine's another holder clamp sleeve avoids the holder to pass through the body of rod of 3 clamping bolt 4 of sleeve, can reduce the possibility that the body of rod of bolt 4 is extrudeed and destroyed.

Referring to fig. 1, the outer side surface of the open end of the sleeve 3 is sleeved with a rubber sleeve 31, and a worker twists the sleeve 3 through the rubber sleeve 31 to screw the sleeve 3 onto the rod body of the bolt 4. The rubber sleeve 31 is arranged, so that the possibility that the sleeve 3 slips from the hand of a worker can be reduced, and the worker can install the sleeve 3 on the rod body of the bolt 4 conveniently.

Referring to fig. 1, when the bolt 4 is subjected to a tensile test, the thread pitch of the bolt 4 may change, so that the thread of the bolt 4 is in interference fit with the thread of the sleeve 3, and it is difficult for a worker to unscrew the sleeve 3. In order to facilitate the detachment of the sleeve 3, two auxiliary grooves 32 are formed in the side face of the closed end of the sleeve 3, the two auxiliary grooves 32 are respectively located on two sides of the axis of the sleeve 3, and the groove bottoms of the two auxiliary grooves 32 are parallel to each other. When the shank of the bolt 4 is tightened with the sleeve 3, a spanner wrench may be used, which can clamp the sleeve 3 through the two auxiliary grooves 32, and conveniently rotate the sleeve 3 and remove the sleeve 3 using the spanner wrench.

The implementation principle of the clamp for the bolt tensile test is as follows: a positioning hole 12 and a locking hole 11 are formed in the positioning ring 1, when the bolt 4 is stretched, the bolt 4 is firstly inserted into the positioning hole 12, and the sleeve 3 is sleeved on the rod body of the bolt 4; the screw 111 is then screwed into the locking hole 11. After the jig is mounted on the tensile testing machine, the two grippers of the tensile testing machine grip the screw 111 and the sleeve 3, respectively. The positioning hole 12 is not communicated with the end face of the positioning ring 1, so that the deformation resistance of the positioning ring 1 can be improved, the possibility of bending the side face of the positioning ring 1 provided with the positioning hole 12 is reduced, and the service life of the clamp is prolonged.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a bolt tensile test is with anchor clamps, includes locating hole (12), locking hole (11), screw rod (111) and sleeve (3), its characterized in that: the positioning structure is characterized by further comprising a positioning ring (1), wherein the positioning hole (12) and the locking hole (11) are formed in the inner wall of the positioning ring (1).

2. The jig for bolt tension testing according to claim 1, wherein: the inner wall of the positioning ring (1) is provided with a limiting cylinder (2) used for limiting the rotation of the bolt (4) cap body, the inner wall of the limiting cylinder (2) is abutted to the side face of the bolt (4) cap body, and the axis of the limiting cylinder (2) is overlapped with the axis of the positioning hole (12).

3. The jig for bolt tension testing according to claim 2, wherein: the number of the limiting cylinders (2) is a plurality, the maximum width of the inner side wall of each limiting cylinder (2) is different, and the height of each limiting cylinder (2) is larger than that of the previous limiting cylinder (2) in the direction away from the positioning hole (12).

4. The jig for bolt tension testing according to claim 2, wherein: the inner side of the limiting cylinder (2) is provided with a support ring (24), and the outer side wall of the support ring (24) is abutted to the inner side wall of the corresponding limiting cylinder (2).

5. The jig for bolt tension testing according to claim 1, wherein: the bottom end of the sleeve (3) is arranged in a closed mode.

6. The jig for bolt tension testing according to claim 1, wherein: at least one pair of auxiliary grooves (32) is formed in the outer side surface of the sleeve (3), and the groove bottoms of the two auxiliary grooves (32) in the same pair are parallel to each other.

7. The jig for bolt tension testing according to claim 1, wherein: the outer side wall of the sleeve (3) is sleeved with a rubber sleeve (31).

8. The jig for bolt tension testing according to claim 1, wherein: the locking hole (11) is a threaded hole.