CN210690224U - Lower clamp for bolt tensile test and clamp combination - Google Patents
Lower clamp for bolt tensile test and clamp combination Download PDFInfo
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- CN210690224U CN210690224U CN201921358423.5U CN201921358423U CN210690224U CN 210690224 U CN210690224 U CN 210690224U CN 201921358423 U CN201921358423 U CN 201921358423U CN 210690224 U CN210690224 U CN 210690224U
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Abstract
The utility model relates to an anchor clamps, concretely relates to bolt tensile test is with lower anchor clamps and anchor clamps combination. The utility model aims at solving the technical problem that the tensile lower fixture of the existing bolt has unbalance loading shearing and easy deformation, and providing a lower fixture and fixture combination for bolt tensile test. The lower clamp is formed by combining a fixing part and a stretching part up and down; the stretching part consists of a square head and a pull rod fixedly connected to the center of the end face at one side of the square head; a first through hole, a second through hole, a first through groove and a second through groove are coaxially and sequentially formed in the center of the fixing part; the first through hole is used for penetrating through the bolt rod part, and the second through hole is used for accommodating the bolt head part; the first through groove and the second through groove penetrate through the front end face and the rear end face of the regular quadrangular prism structure; the first through groove is used for matching with the square head of the stretching part, and the second through groove is used for penetrating through the pull rod of the stretching part. The clamp assembly comprises the lower clamp.
Description
Technical Field
The utility model relates to an anchor clamps, concretely relates to bolt tensile test is with lower anchor clamps and anchor clamps combination.
Background
Bolts typically require tensile testing to test their tensile strength. The existing clamp combination for the bolt tensile test comprises an upper clamp 01 and a lower clamp 03, wherein as shown in fig. 1, the upper clamp 01 is connected with the upper part of the rod part of a bolt 02 through threads; while the lower clamp 03 has two main forms.
The other type is adopted when most laboratories detect bolts 02 with large nominal diameter, namely, a lower clamp 03 adopts a sample cabin structure for fixing the head of the bolt 02 disclosed in the Chinese patent 'a sample tensile clamp' with the publication number of CN 204758395U, as shown in figure 2, a semi-open type inner sample cabin 032 and an outer sample cabin 033 are matched through a dovetail groove to form a cavity for accommodating the head of the bolt 02 and are fixed through a fixing pin 034, relative sliding of the two is effectively prevented, and a 031 pull rod is connected with the inner sample cabin 032. After the lower clamp 03 is used for a long time, the contact part of the lower clamp 03 and the bolt 02 is deformed, so that the two parts of the inner sample cabin 032 and the outer sample cabin 033 slide during stretching, and unbalance loading and shearing are caused; meanwhile, the lower clamp 03 is large in size, heavy and inconvenient to use.
The other is used in part of laboratories, and a ring 04 is used as a lower clamp (namely a clamping end), as shown in fig. 3, and is limited by a V-shaped jaw of a tensile testing machine, so that the wall of the ring 04 cannot be too thick; however, when the bolt 02 with a large nominal diameter is detected, a large clamping force is required, and the ring 04 is often deformed seriously by one-time use and cannot be reused.
Disclosure of Invention
The utility model aims at solving the technical problem that the lower clamp for the existing bolt tensile test has unbalance loading shearing and easy deformation, and providing a lower clamp for the bolt tensile test and a clamp combination.
In order to solve the technical problem, the utility model provides a technical solution as follows:
the lower clamp for the bolt tensile test is characterized in that: the lower clamp is formed by combining a fixing part and a stretching part up and down;
the stretching part consists of a square head and a pull rod fixedly connected to the center of the end face at one side of the square head;
a first through hole, a second through hole, a first through groove and a second through groove are coaxially and sequentially formed in the center of the fixing part;
the first through hole is used for penetrating through the bolt rod part, and the diameter of the first through hole is between the outer diameter of the bolt rod part and the outer diameter of the bolt head contour;
the second through hole is used for accommodating the bolt head, the diameter of the second through hole is larger than the outer diameter of the outline of the bolt head, and the axial length of the second through hole is larger than or equal to the thickness of the bolt head;
the first through groove and the second through groove penetrate through the front end face and the rear end face of the fixing part; the first through groove is matched with the shape and the size of the stretching square head; the second through groove is used for penetrating the pull rod of the stretching part, and the size of the second through groove is smaller than that of the first through groove.
Further, the fixing part is of a cube structure.
Further, the pull rod is a solid round rod.
Further, in order to adapt to larger tensile force, the axial length of the first through hole is not less than the outer diameter of the bolt rod part.
Furthermore, the fixed part and the stretching part are both made of medium carbon alloy steel subjected to quenching and tempering, and the hardness is not lower than 30 HRC.
Further, the hardness of the first through hole is not lower than 40 HRC.
The utility model also provides a bolt is anchor clamps combination for tensile test, its special character lies in: comprises an upper clamp and a lower clamp; the upper clamp is connected with the upper part of the bolt rod part through threads; the lower clamp adopts the lower clamp for the bolt tensile test.
The utility model discloses compare the beneficial effect that prior art has:
1. the utility model provides a lower clamp for bolt tensile test and a clamp combination, wherein the lower clamp is a combination type, and a stretching part consists of a square head and a pull rod fixedly connected with the center of the end face at one side of the square head; the center of the fixing part is coaxially and sequentially provided with a first through hole, a second through hole, a first through groove and a second through groove which penetrate through the upper bottom surface and the lower bottom surface. When the stretching part is used, the rod part of the bolt penetrates out of the fixing part and is fixed by the upper clamp in a threaded connection mode, the head of the bolt is left in the second through hole of the fixing part, the lower end face of the head of the bolt is clamped at the interface of the second through hole and the first through hole, and the square head and the pull rod of the stretching part are inserted into the first through groove and the second through groove of the fixing part from the side face of the fixing part, so that the stretching part and the fixing part are connected together; the pull rod of the stretching part is clamped on a V-shaped jaw of the tensile testing machine. By adopting the combined structure, the fixing part is matched with the bolt and transmits the experimental force to the head part of the bolt, and the stretching part is matched with the fixing part through the through groove to realize connection as a clamping end, so that the deformation problem of the conventional bolt tensile test clamp is solved; compared with the existing left and right combined dovetail groove matching clamp, the experimental force is transmitted along the axial direction, and the phenomenon of unbalanced load shearing is avoided.
2. The utility model provides a bolt is restriction that the lower anchor clamps for tensile test only the pull rod external diameter received tensile test's V type and kept silent, and the size of other each parts all can design according to concrete needs, does not have size limitation, when detecting the great bolt of nominal diameter, under very big clamping-force effect, lower anchor clamps non-deformable can used repeatedly.
3. The utility model provides a bolt is anchor clamps and anchor clamps combination down for tensile test, the size is little, and is very simple light, facilitates the use.
Drawings
FIG. 1 is an assembly view of an upper clamp for a conventional bolt tensile test and an upper end of a rod portion of a bolt to be tested;
FIG. 2 is an assembly diagram of a lower clamp and an end of a bolt head to be tested for a conventional bolt tensile test, wherein the lower clamp is of a left-right split type sample cabin structure;
FIG. 3 is an assembly view of a clamp assembly for a bolt tensile test and a bolt to be tested, wherein a lower clamp is of a circular ring structure;
FIG. 4 is an assembly drawing of the tensile test fixture assembly and the bolt to be tested according to the present invention;
description of reference numerals:
in fig. 1 to 3:
01-upper clamp; 02-bolt; 03-lower clamp; 031-a pull rod; 032-inner sample chamber; 033-outer sample chamber; 034-fixed pins; 04-ring;
in fig. 4:
1, mounting a clamp;
2-bolt; 21-bolt shank; 22-bolt head;
3-a fixed part; 31-a first via; 32-a second via; 33-a first through slot; 34-a second through slot;
4-a stretching section; 41-square head; 42-pull rod.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments.
The clamp assembly for the bolt tensile test of the utility model, as shown in fig. 4, comprises an upper clamp 1 and a lower clamp, wherein the upper clamp 1 is connected with the upper part of the screw rod of a bolt 2 (such as a common hexagon bolt) through threads; the portable up-down combined type lower clamp is designed at present, and the problem of strength tension of a large nominal diameter bolt 2 is solved.
The utility model discloses a lower anchor clamps for bolt tensile test, the lower anchor clamps is formed by fixed part 3 and stretching part 4 from top to bottom combination, fixed part 3 and stretching part 4 all adopt the well carbon alloy steel through quenching and tempering, and the hardness is not lower than 30 HRC; the stretching part 4 consists of a square head 41 and a solid pull rod 42 (round bar) fixedly connected to the center of one side end face of the square head 41, and the pull rod 42 is matched with a V-shaped jaw of the tensile testing machine; the fixing portion 3 is a cube structure, and a first through hole 31, a second through hole 32, a first through groove 33 and a second through groove 34 are coaxially and sequentially formed in the center of the cube structure.
The first through hole 31 is used for passing through the bolt rod part 21, the diameter of the first through hole is between the outer diameter of the bolt rod part 21 and the outer diameter of the contour of the bolt head part 22, and the axial length of the first through hole is not smaller than the outer diameter of the bolt rod part 21; the second through hole 32 is used for accommodating the bolt head 22, the diameter of the hole is larger than the contour outer diameter of the bolt head 22, and the axial length of the second through hole 32 is larger than or equal to the thickness of the bolt head 22.
The first through groove 33 and the second through groove 34 both penetrate through the front end surface and the rear end surface of the fixing part 3; wherein, the first through groove 33 is matched with the shape and the size of the square head 41 of the stretching part 4; the second through groove 34 is used for pulling the rod 42 through the stretching part 4, and the second through groove 34 is smaller in size than the first through groove.
When the bolt fixing part is used, the bolt rod part 21 sequentially penetrates through the second through groove 34, the first through groove 33, the second through hole 32 and the first through hole 31 from top to bottom from one side of the second through groove 34 of the lower clamp fixing part 3 and then penetrates out of the fixing part 3, the upper end of the bolt rod part 21 is fixed with the upper clamp 1 in a threaded connection mode, the bolt head part 22 is left in the second through hole 32, and the lower end face of the bolt head part 22 is clamped at the interface of the second through hole 32 and the first through hole 31; the square head 41 of the stretching part 4 is inserted into the first through groove 33 of the fixing part 3 from the side of the fixing part 3, thereby connecting the stretching part 4 and the fixing part 3 together; the pull rod 42 of the stretching portion 4 is clamped on a V-shaped jaw of a tensile testing machine. During stretching, a tensile force can be transmitted to the bolt head 22 through the combined lower jig.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for a person skilled in the art to modify the specific technical solutions described in the foregoing embodiments or to equally replace some technical features of the embodiments, and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.
Claims (7)
1. The utility model provides a bolt is anchor clamps down for tensile test which characterized in that: the lower clamp is formed by combining a fixing part (3) and a stretching part (4) up and down;
the stretching part (4) consists of a square head (41) and a pull rod (42) fixedly connected to the center of one side end face of the square head (41);
a first through hole (31), a second through hole (32), a first through groove (33) and a second through groove are coaxially and sequentially formed in the center of the fixing part (3);
the first through hole (31) is used for penetrating through the bolt rod part (21) and has a hole diameter between the outer diameter of the bolt rod part (21) and the outer diameter of the profile of the bolt head part (22);
the second through hole (32) is used for accommodating the bolt head (22), the aperture of the second through hole is larger than the outer diameter of the outline of the bolt head (22), and the axial length of the second through hole is larger than or equal to the thickness of the bolt head (22);
the first through groove (33) and the second through groove (34) penetrate through the front end face and the rear end face of the fixing part (3); wherein the first through groove (33) is matched with the square head (41) of the stretching part (4) in shape and size; the second through groove (34) is used for penetrating through the pull rod (42) of the stretching part (4), and the size of the second through groove (34) is smaller than that of the first through groove.
2. The lower jig for bolt tensile test according to claim 1, characterized in that: the fixing part (3) is of a cube structure.
3. The lower jig for bolt tensile test according to claim 2, characterized in that: the pull rod (42) is a solid round rod.
4. The lower jig for bolt tensile test according to claim 3, characterized in that: the axial length of the first through hole (31) is not less than the outer diameter of the bolt rod part (21).
5. The lower jig for bolt tensile test according to claim 4, characterized in that: the fixing part (3) and the stretching part (4) are both made of medium carbon alloy steel subjected to quenching and tempering, and the hardness is not lower than 30 HRC.
6. The lower jig for bolt tensile test according to claim 5, characterized in that: the hardness of the first through hole (31) is not lower than 40 HRC.
7. The utility model provides a bolt is anchor clamps combination for tensile test which characterized in that: comprises an upper clamp (1) and a lower clamp; the upper clamp (1) is connected with the upper part of the bolt rod part (21) through threads; the lower clamp is the lower clamp for the bolt tensile test according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921358423.5U CN210690224U (en) | 2019-08-20 | 2019-08-20 | Lower clamp for bolt tensile test and clamp combination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921358423.5U CN210690224U (en) | 2019-08-20 | 2019-08-20 | Lower clamp for bolt tensile test and clamp combination |
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| Publication Number | Publication Date |
|---|---|
| CN210690224U true CN210690224U (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921358423.5U Active CN210690224U (en) | 2019-08-20 | 2019-08-20 | Lower clamp for bolt tensile test and clamp combination |
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| CN (1) | CN210690224U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115753356A (en) * | 2023-02-13 | 2023-03-07 | 西北工业大学 | Testing system for measuring bolt strain based on optical fiber sensor and method and application thereof |
-
2019
- 2019-08-20 CN CN201921358423.5U patent/CN210690224U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115753356A (en) * | 2023-02-13 | 2023-03-07 | 西北工业大学 | Testing system for measuring bolt strain based on optical fiber sensor and method and application thereof |
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