CN211697235U - Tensile test clamp for left-handed threaded bolt - Google Patents
Tensile test clamp for left-handed threaded bolt Download PDFInfo
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- CN211697235U CN211697235U CN201922211893.5U CN201922211893U CN211697235U CN 211697235 U CN211697235 U CN 211697235U CN 201922211893 U CN201922211893 U CN 201922211893U CN 211697235 U CN211697235 U CN 211697235U
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Abstract
The utility model relates to a mechanical stress testing arrangement, concretely relates to tensile test anchor clamps of left-hand thread bolt. The tensile test clamp for the left-handed threaded bolt comprises an upper clamp body and a lower clamp body; one of the upper clamp body and the lower clamp body is provided with a bolt head connecting structure, and the bolt head connecting structure is used for a bolt to be tested to penetrate through and is in stop fit with the head of the bolt to be tested along the axial direction of the bolt; the tensile test fixture further comprises a thread adapter; the two ends of the thread conversion head in the up-down direction are respectively provided with a bolt connecting hole and a screw connecting hole; the bolt connecting hole is a left-handed threaded hole for threaded connection of a left-handed threaded bolt to be detected; the other one of the upper clamp body and the lower clamp body is provided with a threaded connecting rod, and the stud connecting hole is used for being connected to the threaded connecting rod in a threaded mode so as to transfer axial tension. When the bolts to be tested with different specifications are replaced, the operation is convenient and fast.
Description
Technical Field
The utility model relates to a mechanical stress testing arrangement, concretely relates to tensile test anchor clamps of left-hand thread bolt.
Background
In the short-time mechanical tension test, the tension test of the left-hand threaded bolt is not as frequent as the tension test of the right-hand threaded bolt, but the tension test of the left-hand threaded bolt is also encountered. The tensile test is preferably performed with an insertion jig according to the requirements associated with GJB715.23A-2015 tensile strength for fastener test method. As shown in fig. 1, the prior art insertion jig is composed of a tension washer 13, a threaded joint 15, and upper and lower jig bodies 11 and 12. The upper clamp body 11 and the lower clamp body 12 are provided with clamping grooves, the end parts of the clamping grooves in the length direction are provided with clamping openings, and the clamping openings are used for clamping the threaded joint 15 and the stretching gasket 13 along the radial direction of the stretching gasket 13. And a safety door is arranged at the position of the clamping groove and is used for preventing the threaded joint 15 and the stretching gasket 13 clamped into the clamping groove from sliding out.
When the device is used, the bolt 14 to be tested is inserted into the through hole in the middle of the tensile gasket 13, the tensile gasket 13 is clamped into the clamping groove of the upper clamp body 11 along the radial direction, then the threaded joint 15 slides into the clamping groove of the lower clamp body 12 along the radial direction, the safety door is closed, the bolt 14 to be tested is connected with the threaded joint 15, and then a specified load is applied to perform tests, such as a tensile test device and a test method in the technologies disclosed by the authorized bulletin number CN203479610U and the authorized bulletin number CN 201152840Y.
According to the structure, when test samples of different specifications are tested, the safety door needs to be opened to take the stretching gasket 13 and the threaded joint 15 out of the upper clamp body 11 and the lower clamp body 12, different stretching gaskets 13 and threaded joints 15 are replaced, the replaced stretching gaskets 13 and threaded joints 15 are put into the upper clamp body 11 and the lower clamp body 12 again, and the safety door is closed, so that the operation is complex, time-consuming and labor-consuming. Moreover, each specification of the bolt to be tested 14 corresponds to one specification of the threaded joint 15, the number is large, time and labor are wasted when the threaded joints 15 of different specifications are replaced, the shape of the threaded joint 15 is the same as the shape of the threaded joint used for testing common threads, only the thread turning direction is different, the bolt is not easy to distinguish from the shape, and the bolt is easy to be confused when the specification is replaced. Moreover, in order to meet the connection requirement of the threaded joint and the sleeve, the external dimension of the threaded joint 15 is large, and in order to match bolts 14 to be tested with different specifications, the threaded joint 15 with the corresponding specification needs to be manufactured, which causes the problems of high manufacturing cost and large occupied space.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a tensile test anchor clamps of left-handed thread bolt can conveniently be applicable to the experiment of left-handed thread bolt.
The utility model discloses in adopt following technical scheme:
the tensile test clamp for the left-handed threaded bolt comprises an upper clamp body and a lower clamp body;
one of the upper clamp body and the lower clamp body is provided with a bolt head connecting structure, and the bolt head connecting structure is used for a bolt to be tested to penetrate through and is in stop fit with the head of the bolt to be tested along the axial direction of the bolt;
the tensile test fixture further comprises a thread adapter;
the two ends of the thread conversion head in the up-down direction are respectively provided with a bolt connecting hole and a screw connecting hole;
the bolt connecting hole is a left-handed threaded hole for threaded connection of a left-handed threaded bolt to be connected;
the other one of the upper clamp body and the lower clamp body is provided with a threaded connecting rod, and the screw connecting hole is used for being connected to the threaded connecting rod in a threaded mode so as to transmit axial tension.
Has the advantages that: adopt above-mentioned scheme, the screw thread conversion head is in the same place threaded connection pole and the bolted connection that awaits measuring of left-handed screw form, realize that left-handed screw and the conversion of general screw thread are connected, when the bolt that awaits measuring of different specifications needs to be tested, take off the bolt that awaits measuring from the screw thread conversion head earlier, take off the screw thread conversion head from the threaded connection pole again, change with the screw thread conversion head of the bolt adaptation that awaits measuring of other specifications can, the bolt that awaits measuring of different specifications only need change the screw thread conversion head of corresponding specification, time saving and labor saving, easy operation is convenient.
As a preferable technical scheme, the bolt connecting hole and the screw connecting hole on the thread switching head are isolated.
Has the advantages that: the bolt connecting hole and the screw connecting hole on the thread converting head are isolated, so that the threaded connecting rod can be ensured to be screwed in the screw connecting hole and the bolt to be detected can be screwed in the bolt connecting hole, the bolt to be detected can be prevented from being in direct contact with the threaded connecting rod, the mutual acting force between the bolt to be detected and the threaded connecting rod is avoided, and the measuring result is prevented from being interfered by other factors.
As a preferred technical scheme, the bolt connecting hole and the screw connecting hole which are arranged at the two ends of the thread adapter in the vertical direction are blind holes, and the bottoms of the bolt connecting hole and the screw connecting hole are isolated from each other.
Has the advantages that: the bolt connecting hole and the screw connecting hole are made into blind holes, so that the isolation effect is good, and the contact between the threaded connecting rod and the bolt to be tested is avoided in the installation process of the bolt to be tested.
According to the preferable technical scheme, the threaded connecting rod is formed by a double-end stud, and a stud connecting structure is arranged on the corresponding upper clamp body or the corresponding lower clamp body.
Has the advantages that: the double-sided stud is used for connecting the thread conversion head with the stud connecting structure, when the threads of different specifications are tested, the thread conversion head is taken down from the threaded connecting rod and is changed into the thread conversion head corresponding to the thread specification of the bolt to be tested, the threaded connecting rod does not need to be taken down from the stud connecting structure in the process, and the process is convenient to assemble and disassemble and saves time and labor.
According to a preferable technical scheme, the stud connecting structure is a threaded joint;
one end of the threaded joint close to the stud penetrates through the upper fixture body or the lower fixture body, and the other end of the threaded joint is provided with an annular step which is used for being in stop fit with the upper fixture body or the lower fixture body;
one end of the threaded joint close to the stud is provided with a threaded hole for threaded connection of the stud.
Has the advantages that: the annular step stop is convenient and reliable, and the threaded connector can be conveniently taken down from the clamp body.
As a preferable technical scheme, the outer circle diameter of the thread adapter is smaller than that of the threaded joint.
Has the advantages that: the screw thread adapter is small in size, saves space and cost and is convenient to assemble and disassemble.
As a preferred technical scheme, the thread conversion head is a cylinder.
Has the advantages that: the cylinder is convenient to manufacture and has beautiful appearance.
As a preferred technical scheme, the diameters of the two ends of the stud are consistent.
Has the advantages that: the two ends of the stud are consistent, the universality is strong, and the positive and negative problems of the stud are not considered when the clamp is installed.
According to a preferable technical scheme, the bolt head connecting structure comprises a circular gasket and an annular limiting table on the end face of the circular gasket, and the annular limiting table is used for forming stop matching with the upper clamp body or the lower clamp body;
the middle of the circular gasket is provided with a through hole for the bolt to be tested to pass through and matched with the head of the bolt to be tested in a blocking way along the axial direction of the bolt.
Has the advantages that: the annular limiting table is reliable and convenient to stop, and is simple to operate and convenient to assemble and disassemble when bolts to be tested of different specifications are replaced.
The above-described preferred embodiments may be adopted alone, or two or more embodiments may be arbitrarily combined when they can be combined, and the embodiments formed by the combination are not specifically described here and are included in the description of the present patent.
Drawings
Fig. 1 is a schematic structural diagram of an insertion type tensile test fixture in the prior art.
Figure 2 is a tooling fixture assembly drawing of the present application.
Fig. 3 is a schematic view of a thread transition head.
Fig. 4 is a schematic view of a threaded connecting rod.
Fig. 5 is a schematic view of the structure of a threaded joint.
Fig. 6 is a schematic structural view of a circular gasket.
Fig. 7 is a top view of the circular shim of fig. 6.
The names of the components corresponding to the corresponding reference numerals in the drawings are:
11-an upper clamp body, 12-a lower clamp body, 13-a tensile gasket, 14-a bolt to be tested, 15-a threaded joint, 21-an upper clamp body, 22-a lower clamp body, 23-a circular gasket, 24-a bolt to be tested, 25-a threaded conversion head, 251-a bolt connecting hole, 252-a screw rod connecting hole, 26-a stud and 27-a threaded joint.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that relational terms such as the terms first and second, and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the recitation of "comprising an … …" may occur without the exclusion of additional like elements present in the process, method, article, or apparatus that comprises the element.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.
In the description of the present invention, unless otherwise explicitly specified or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.
The present invention will be described in further detail with reference to examples.
Embodiment 1 in the present invention is shown in fig. 2 to fig. 7:
the tensile test clamp for the left-handed threaded bolt comprises an upper clamp body 21 and a lower clamp body 22 as shown in figure 1, wherein the upper clamp body 21 and the lower clamp body 22 are respectively provided with a clamping groove. The upper clamp body 21 is provided with a circular gasket 23 as shown in fig. 6 and 7, the circular gasket 23 is provided with an annular limiting table 231, and the annular limiting table 231 is in stop fit with the clamping groove of the upper clamp body 21. The circular gasket 23 is provided with a through hole for the bolt 24 to be tested to pass through and to be matched with the head of the bolt 24 to be tested in a blocking manner along the axial direction of the bolt. The lower clamp body 22 is provided with a threaded joint 27, the threaded joint 27 is in stop fit with the through hole in the lower clamp body 22, and a threaded hole is formed in the middle of one end of the threaded joint 27.
The tensile test fixture for the left-handed threaded bolt further comprises a thread conversion head 25 and a stud 26, wherein one end of the thread conversion head 25 is provided with a bolt connecting hole 251, and the bolt connecting hole 251 is a left-handed threaded hole and is used for being connected to one end of a bolt 24 to be tested which is also left-handed threaded. The other end of the threaded transition piece 25 is provided with a screw connection hole 252, and the screw connection hole 252 is a threaded hole for connecting to one end of the stud 26 to transmit axial tension. The screw adapter 25 connects the left-handed screw to-be-tested bolt 24 and the stud bolt 26, and realizes the connection between the left-handed screw and the normal screw. One end of the stud 26 is connected to the threaded joint 27. To this end, the bolt 4 to be tested is fixed on the tool clamp through the bolt head connecting structure 3, the thread adapter 5, the thread connecting rod 6 and the thread joint 7 so as to perform a tensile test.
The thread adapter 25 is a cylinder, the diameter of the outer circle of the thread adapter 25 is smaller than that of the thread connector 27, as shown in fig. 3, a bolt connecting hole 251 formed at one end of the thread adapter 25 is isolated from a screw connecting hole 252 formed at the other end of the thread adapter, both the bolt connecting hole 251 and the screw connecting hole 252 are blind holes, and the bottoms of the bolt connecting hole 251 and the screw connecting hole 252 are isolated from each other. The bolt connection hole 251 is a left-handed screw hole, and is fitted to one end of the left-handed screw 24 to be tested. The bolt connecting hole 251 is matched with the bolt 24 to be tested, and the screw thread conversion heads 25 with different specifications are only different in the specification of the bolt connecting hole 251, and the specification of the bolt connecting hole 251 is matched with the specification of the bolt 24 to be tested.
The stud 26 forms a threaded connecting rod, as shown in fig. 4, the diameters of the two ends of the stud 26 are the same, the thread specifications are the same, one end of the stud 26 is matched with the screw connecting hole 252, the other end of the stud is matched with the threaded hole on the threaded joint 27, when the to-be-tested bolt 24 with different specifications is replaced, only the thread switching head 25 with the corresponding specification needs to be replaced, the stud 26 does not need to be replaced, and the operation is rapid and convenient.
The threaded connector 27 has a cylindrical end at one end, and as shown in fig. 5, a threaded hole is formed in the middle of the end, and the threaded hole is connected with one end of the stud 26 in a matching manner. The other end of the threaded joint 27 is provided with an annular step 271, the annular step 271 is used for forming stop matching when the cylindrical end of the threaded joint 27 penetrates through the clamping groove of the lower clamp body 22, and the middle of one end of the threaded joint 27, which is provided with the annular step 271, is provided with a unthreaded hole, so that materials can be saved, and the weight of the tool can be reduced.
During a tensile test, after the bolt 24 to be tested is connected with the circular gasket 23, the circular gasket 23 is radially slid into the clamping groove of the upper clamp body along the circular gasket 23, and the annular limiting table 231 and the through hole of the upper clamp body 21 form stop fit. The threaded joint 27 is then slid into the slot of the lower clamp body 22 in the radial direction, and the annular step 271 forms a stop fit with the end face of the slot. Then, one end of the stud 26 is connected with the threaded hole on the threaded connector 27, the other end of the stud is connected with the screw connecting hole 252 on the threaded adapter 25, and finally, the bolt 24 to be tested is connected with the bolt connecting hole 251 on the threaded adapter 25, so far, the bolt 24 to be tested is fixed on a tool clamp through the round gasket 23, the threaded adapter 25, the stud 26 and the threaded connector 27 to perform a tensile test.
The utility model provides a tensile test anchor clamps embodiment 2 of left-handed screw bolt:
the difference between embodiment 2 and embodiment 1 in the present invention is that in embodiment 1, the bolt connecting hole 251 and the screw connecting hole 252 at the two ends of the screw adapter 25 are separately isolated, and in this embodiment, the screw connecting hole 251 and the screw connecting hole 252 are communicated with each other, and an isolation gasket is disposed at the junction of the screw connecting hole 251 and the screw connecting hole 252.
In the above embodiment, the thread adapter 25 has a cylindrical shape, in other embodiments, two planes may be milled on the outer cylindrical surface of the thread adapter 25 to facilitate the tightening of a wrench or other tool during the installation of the fixture, or the thread adapter 25 has a polygonal prism shape.
The utility model provides a tensile test anchor clamps embodiment 3 of left-handed screw bolt:
the difference between embodiment 3 and embodiment 1 in the present invention is that, in embodiment 1, the threaded adapter 25 and the threaded adapter 27 are connected together through the stud 26, in this embodiment, the threaded connection rod 26 and the threaded adapter 27 are not provided, but a bolt is inserted into the slot of the lower clamp body 22, the bolt head and the slot end face form a stop fit, and the other end of the bolt is connected with the screw connection hole 252 on the threaded adapter 25.
The above description is only a preferred embodiment of the present application, and not intended to limit the present application, the scope of the present application is defined by the appended claims, and all changes in equivalent structure made by using the contents of the specification and the drawings of the present application should be considered as being included in the scope of the present application.
Claims (9)
1. The tensile test clamp for the left-handed threaded bolt comprises an upper clamp body and a lower clamp body;
one of the upper clamp body and the lower clamp body is provided with a bolt head connecting structure, and the bolt head connecting structure is used for a bolt to be tested to penetrate through and is in stop fit with the head of the bolt to be tested along the axial direction of the bolt;
the method is characterized in that:
the tensile test fixture further comprises a thread adapter;
the two ends of the thread conversion head in the up-down direction are respectively provided with a bolt connecting hole and a screw connecting hole;
the bolt connecting hole is a left-handed threaded hole for threaded connection of a left-handed threaded bolt to be connected;
the other one of the upper clamp body and the lower clamp body is provided with a threaded connecting rod, and the screw connecting hole is used for being connected to the threaded connecting rod in a threaded mode so as to transmit axial tension.
2. The tension test jig for the left-hand threaded bolt according to claim 1, characterized in that: the bolt connecting hole and the screw connecting hole on the screw thread conversion head are isolated.
3. The left-handed threaded bolt tension test jig according to claim 2, characterized in that: the bolt connecting hole and the screw connecting hole which are arranged at the two ends of the thread adapter in the vertical direction are blind holes, and the bottoms of the two holes of the bolt connecting hole and the screw connecting hole are isolated from each other.
4. The left-hand threaded bolt tension test jig according to any one of claims 1 to 3, characterized in that: the threaded connecting rod is formed by a double-end stud, and a stud connecting structure is arranged on the corresponding upper clamp body or the corresponding lower clamp body.
5. The left-handed threaded bolt tensile test jig of claim 4, wherein: the stud connecting structure is a threaded joint;
one end of the threaded joint close to the stud penetrates through the upper fixture body or the lower fixture body, and the other end of the threaded joint is provided with an annular step which is used for being in stop fit with the upper fixture body or the lower fixture body;
one end of the threaded joint close to the stud is provided with a threaded hole for threaded connection of the stud.
6. The tension test fixture for the left-handed threaded bolt according to claim 5, wherein the outer diameter of the screw adapter is smaller than the outer diameter of the nipple.
7. A tension test fixture for a left-handed threaded bolt as recited in any one of claims 1 to 3 wherein the threaded adapter is a cylinder.
8. The left-hand threaded bolt tensile test fixture of any one of claims 1 to 3, wherein the stud has uniform diameters at both ends.
9. The left-handed threaded bolt tensile test fixture of any one of claims 1 to 3, wherein the bolt head connecting structure comprises a circular gasket, and an annular limiting table is arranged on the end surface of the circular gasket and used for forming stop fit with the upper fixture body or the lower fixture body;
the middle of the circular gasket is provided with a through hole for the bolt to be tested to pass through and matched with the head of the bolt to be tested in a blocking way along the axial direction of the bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922211893.5U CN211697235U (en) | 2019-12-11 | 2019-12-11 | Tensile test clamp for left-handed threaded bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922211893.5U CN211697235U (en) | 2019-12-11 | 2019-12-11 | Tensile test clamp for left-handed threaded bolt |
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| Publication Number | Publication Date |
|---|---|
| CN211697235U true CN211697235U (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922211893.5U Active CN211697235U (en) | 2019-12-11 | 2019-12-11 | Tensile test clamp for left-handed threaded bolt |
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| CN (1) | CN211697235U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323433A (en) * | 2022-01-14 | 2022-04-12 | 河南省计量科学研究院 | Supersound bolt stress appearance calibrating device |
-
2019
- 2019-12-11 CN CN201922211893.5U patent/CN211697235U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323433A (en) * | 2022-01-14 | 2022-04-12 | 河南省计量科学研究院 | Supersound bolt stress appearance calibrating device |
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