Segment bolt tensile test fixture and tensile performance testing machine

Abstract

The present invention discloses a segment bolt tensile test fixture and a tensile performance testing machine, wherein the segment bolt tensile test fixture comprises a first fixture assembly for fixing the nut end of the arc bolt to be tested and a second fixture assembly for fixing the threaded end of the arc bolt to be tested, the first fixture assembly comprises a first base and a limiting sleeve, the first end of the limiting sleeve is movably connected to the first base and has a first through hole therein for the nut end to pass through, the second end of the limiting sleeve has a second through hole therein for the threaded end to pass through, wherein the first through hole is connected to the second through hole, and the aperture of the first through hole is larger than the aperture of the second through hole; the second fixture assembly comprises a second base and a threaded sleeve, wherein one end of the threaded sleeve is movably connected to the second base, and the other end has an internal threaded hole that matches the threaded end. The segment bolt tensile test fixture can not only improve the efficiency of the segment bolt tensile test, but also improve the accuracy of the test results.

Description

Technical Field

[0001] The invention belongs to the technical field of bolt tensile testing, and in particular relates to a segment bolt tensile testing fixture and a tensile performance testing machine. Background Art

[0002] In the prior art, arc bolts are commonly used as fasteners to connect adjacent tunnel segments. Due to the diversity of sizes and specifications of the segments, the sizes and shapes of the arc bolts are also different. Therefore, before conducting a bolt tensile test, each bolt must be straightened according to its specific conditions to meet the basic requirements of the subsequent tensile test.

[0003] At present, the straightening process of using traditional threaded clamps to test the tensile performance of segment bolts is relatively complicated, inefficient, and difficult to straighten in place at one time. At the same time, the following phenomena may occur during the actual straightening operation:

[0004] (1) It is easy to over-adjust, causing the bolt to warp or deform before the tensile test, thus affecting the accuracy of the test results;

[0005] (2) It is easy to damage the threaded end of the bolt, which may destroy the integrity of the test sample and further affect the accuracy of the test results.

[0006] Therefore, in the straightening process of the segment bolt tensile performance test, how to improve the test efficiency and the accuracy of the test results is a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0007] In order to overcome the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a segment bolt tensile test fixture, aiming to improve the efficiency of the segment bolt tensile test and improve the accuracy of the test results.

[0008] In order to achieve the purpose, the technical solution adopted by the present invention is as follows:

[0009] A segment bolt tensile test fixture comprises a first fixture assembly for fixing the nut end of a curved bolt to be tested and a second fixture assembly for fixing the threaded end of the curved bolt to be tested, wherein the first fixture assembly comprises a first base and a limiting sleeve, wherein the first end of the limiting sleeve is movably connected to the first base and has a first through hole therein for the nut end to pass through, and wherein the second end of the limiting sleeve has a second through hole therein for the threaded end to pass through, wherein the first through hole is connected to the second through hole and the aperture of the first through hole is larger than the aperture of the second through hole; the second fixture assembly comprises a second base and a threaded sleeve, wherein one end of the threaded sleeve is movably connected to the second base and the other end has an internal threaded hole threadably matched with the threaded end.

[0010] Furthermore, the first clamp assembly also includes a first latch, one end of the first base has a first installation space, and the first end of the limiting sleeve is rotatably connected to the first installation space of the first base through the first latch.

[0011] Further, the first clamp assembly also includes a first pin and a connecting rod, one end of the first base has a first installation space, and the first end of the limiting sleeve is rotatably connected to the first installation space of the first base through the connecting rod and the first pin, wherein one end of the connecting rod is detachably connected to the first end of the limiting sleeve, and the other end is rotatably connected to the first installation space of the first base through the first pin.

[0012] Furthermore, one end of the connecting rod is threadably connected to the first end of the limiting sleeve.

[0013] Furthermore, the second clamp assembly also includes a second latch pin, one end of the second base has a second installation space, and one end of the threaded sleeve is rotatably connected to the second installation space of the second base through the second latch pin.

[0014] Furthermore, the first clamp assembly also includes a washer that can be placed in the first through hole, wherein the inner diameter of the washer is larger than the outer diameter of the threaded end and smaller than the outer diameter of the nut end, and the outer diameter of the washer is larger than the aperture of the second through hole.

[0015] Correspondingly, the present invention also proposes a tensile performance testing machine, comprising a testing machine body and a segment bolt tensile testing fixture as described in any one of claims 1 to 6, wherein the testing machine body is provided with a first chuck and a second chuck arranged opposite to each other, wherein an end of the first base away from the nut end is clamped on the first chuck, and an end of the second base away from the threaded end is clamped on the second chuck.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The segment bolt tensile test fixture proposed by the present invention, when in use, only needs to insert the nut end of the arc bolt into the limiting sleeve and screw the threaded end of the arc bolt into the threaded sleeve, the operation is very simple and convenient, and the setting of the threaded sleeve can avoid damaging the threaded end of the arc bolt during the test; at the same time, because the limiting sleeve is movably connected to the first base that can be installed on the tensile performance testing machine, and the threaded sleeve is also movably connected to the second base that can be installed on the tensile performance testing machine, the test angle of the arc bolt can be flexibly adjusted during the test to avoid the problem of over-adjustment. It can be seen that the segment bolt tensile test fixture proposed by the present invention can realize the straightening of the bolt sample and the continuous tensile test, which not only improves the test efficiency, but also avoids the problems of over-adjustment and damage to the thread during the test, and effectively improves the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0019] Figure 1 It is a structural schematic diagram of a segment bolt tensile test fixture in one embodiment of the present invention;

[0020] Figure 2 It is a schematic structural diagram of a limiting sleeve in one embodiment of the present invention;

[0021] Figure 3 This is a schematic structural diagram of a first base in one embodiment of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the second base in one embodiment of the present invention;

[0023] Figure 5 It is a schematic structural diagram of a segment bolt tensile test fixture in another embodiment of the present invention;

[0024] Figure 6 It is a structural schematic diagram of a limiting sleeve (including a gasket) in another embodiment of the present invention;

[0025] Figure 7 It is a structural schematic diagram of an arc-shaped bolt to be tested in the prior art;

[0026] Figure 8 Schematic diagram of the use principle of the segment bolt tensile test fixture in one embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1-first clamp assembly, 11-first base, 111-first installation position, 12-limiting sleeve, 121-first through hole, 122-second through hole, 13-first pin, 14-connecting rod, 15-washer, 2-second clamp assembly, 21-second base, 211-second installation position, 22-threaded sleeve, 221-inner threaded hole, 23-second pin, 3-arc bolt to be tested, 31-nut end, 32-threaded end. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention, and the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0031] Reference Figure 1 , Figure 2 and Figure 7 The embodiment of the present invention provides a segment bolt tensile test fixture, including a first fixture assembly 1 for fixing the nut end 31 of the arc-shaped bolt 3 to be tested and a second fixture assembly 2 for fixing the threaded end 32 of the arc-shaped bolt 3 to be tested, the first fixture assembly 1 includes a first base 11 and a limiting sleeve 12, the first end of the limiting sleeve 12 is movably connected to the first base 11 and has a first through hole 121 therein for the nut end 31 to pass through, the second end of the limiting sleeve 12 has a second through hole 122 therein for the threaded end 32 to pass through, wherein the first through hole 121 is communicated with the second through hole 122, and the aperture of the first through hole 121 is larger than the aperture of the second through hole 122; the second fixture assembly 2 includes a second base 21 and a threaded sleeve 22, wherein one end of the threaded sleeve 22 is movably connected to the second base 21, and the other end has an internal threaded hole 221 threadably matched with the threaded end 32.

[0032] In this embodiment, when the segment bolt tensile test fixture is used, it is only necessary to insert the nut end 31 of the arc bolt into the limiting sleeve 12 and screw the threaded end 32 of the arc bolt into the threaded sleeve 22. The operation is very simple and convenient, and the setting of the threaded sleeve 22 can avoid damaging the threaded end 32 of the arc bolt during the test. At the same time, since the limiting sleeve 12 is movably connected to the first base 11 that can be installed on the tensile performance testing machine, and the threaded sleeve 22 is also movably connected to the second base 21 that can be installed on the tensile performance testing machine, the test angle of the arc bolt can be flexibly adjusted during the test to avoid the problem of over-adjustment. It can be seen that the segment bolt tensile test fixture of this embodiment can realize the straightening of the bolt sample and the continuous tensile test, which not only improves the test efficiency, but also avoids the problem of over-adjustment and damage to the thread during the test, and effectively improves the accuracy of the test results.

[0033] Further, refer to Figures 1 to 3 In an exemplary embodiment, the first clamp assembly 1 also includes a first latch 13, one end of the first base 11 has a first installation space 111, and the first end of the limiting sleeve 12 is rotatably connected to the first installation space 111 of the first base 11 through the first latch 13.

[0034] In this embodiment, based on the above-mentioned structural design, the limiting sleeve 12 can flexibly rotate with the first pin 13 as the axis. Not only is the structure simple and reliable, but the test angle of the arc bolt can be flexibly adjusted during the test, thereby avoiding the problem of excessive adjustment during the test, which is beneficial to improving the accuracy of the test results.

[0035] Further, refer to Figure 3 and Figure 5 In another exemplary embodiment, the first clamp assembly 1 further includes a first latch 13 and a connecting rod 14, one end of the first base 11 has a first installation space 111, and the first end of the limiting sleeve 12 is rotatably connected to the first installation space 111 of the first base 11 through the connecting rod 14 and the first latch 13, wherein one end of the connecting rod 14 is detachably connected to the first end of the limiting sleeve 12, and the other end is rotatably connected to the first installation space 111 of the first base 11 through the first latch 13. The connecting rod 14 and the limiting sleeve 12 can be detachably connected by means of a snap connection, a threaded connection, or the like.

[0036] In this embodiment, based on the above-mentioned structural design, the limiting sleeve 12 and the connecting rod 14 as a whole can be flexibly rotated with the first pin 13 as the axis. Not only is the structure simple and reliable, but the test angle of the arc bolt can be flexibly adjusted during the test, thereby avoiding the problem of excessive adjustment during the test, which is beneficial to improving the accuracy of the test results. At the same time, by adding the connecting rod 14, the nut end 31 of the arc bolt 3 to be tested can also be conveniently installed in the limiting sleeve 12 without the need for a detachable design of the first pin 13 (that is, the connection between the first pin 13 and the first base 11 can be a fixed connection), and there is no need to open a pin hole on the limiting sleeve 12 that matches the first pin 13, which is beneficial to improving the strength of the limiting sleeve 12, so that the tensile test of the bolt can be carried out more stably.

[0037] Further, refer to Figures 5 to 7 In an exemplary embodiment, one end of the connecting rod 14 is threadedly connected to the first end of the limiting sleeve 12. As shown, one end of the connecting rod 14 is provided with an external thread, and the first through hole 121 is provided with an internal thread, and one end of the connecting rod 14 can be threadedly engaged with the first through hole 121 of the limiting sleeve 12.

[0038] In this embodiment, based on the above-mentioned structural design, a detachable connection between the connecting rod 14 and the limiting sleeve 12 is realized. Moreover, during installation, the nut end 31 of the arc bolt 3 to be tested is tightened by screwing the connecting rod 14 into the first through hole 121, so that the nut end 31 of the arc bolt 3 to be tested can be fastened in the limiting sleeve 12, which is beneficial to further improve the stability of the tensile test.

[0039] Further, refer to Figure 1 and Figure 4 In an exemplary embodiment, the second clamp assembly 2 further includes a second latch 23 , one end of the second base 21 has a second installation space 211 , and one end of the threaded sleeve 22 is rotatably connected to the second installation space 211 of the second base 21 through the second latch 23 .

[0040] In this embodiment, based on the above structural design, the threaded sleeve 22 can flexibly rotate with the second pin 23 as the axis. Not only is the structure simple and reliable, but the test angle of the arc bolt can be flexibly adjusted during the test, thereby avoiding the problem of excessive adjustment during the test, which is beneficial to improving the accuracy of the test results.

[0041] Further, refer to Figures 5 to 7In an exemplary embodiment, the first clamp assembly 1 further includes a washer 15 that can be placed in the first through hole 121, wherein the inner diameter of the washer 15 is larger than the outer diameter of the threaded end 32 and smaller than the outer diameter of the nut end 31, and the outer diameter of the washer 15 is larger than the aperture of the second through hole 122. Illustratively, the washer 15 is annular.

[0042] In this embodiment, the above-mentioned washers 15 can be customized according to bolts of different specifications. In this way, when in use, by replacing washers 15 of different diameters, a limiting sleeve 12 of one specification can be used for testing bolts of multiple specifications, making the use of the entire clamp more flexible and more practical.

[0043] For easy understanding of the segment bolt tensile test fixture disclosed in the present invention, refer to Figures 3 to 8 In a specific embodiment, the straightening process of the segment bolt tensile performance test using the segment bolt tensile test fixture is as follows:

[0044] Before use, select the fixture parts of corresponding sizes according to the specifications of the arc-shaped bolt 3 to be tested; when in use, the nut end 31 of the arc-shaped bolt 3 to be tested can be inserted into the limiting sleeve 12 with the washer 15, and the threaded end 32 can be screwed into the threaded sleeve 22; then the connecting rod 14 can be screwed into the first through hole 121 of the limiting sleeve 12, so that the nut end 31 of the arc-shaped bolt 3 to be tested can be fastened in the limiting sleeve 12; then the tensile performance testing machine can be started to clamp the end of the first base 11 away from the connecting rod 14 in the upper chuck of the tensile performance testing machine, and the connecting rod that has been connected to the limiting sleeve 12 as a whole can be screwed into the first through hole 121 of the limiting sleeve 12. 14 is installed in the first installation position 111 of the first base 11 through the first pin 13, ensuring that the connecting rod 14 can flexibly rotate with the first pin 13 as the axis; then, the end of the second base 21 away from the threaded sleeve 22 can be clamped in the lower chuck of the tensile performance testing machine, and the threaded sleeve 22 can be screwed and installed on the threaded end 32 of the arc bolt 3 to be tested; then, the end of the threaded sleeve 22 away from the threaded end 32 can be installed in the second installation position 211 of the second base 21 through the second pin 23; finally, the test is started at the standard test speed, and the bolt straightening and the bolt tensile test can be completed successively.

[0045] It should be noted that other contents of the segment bolt tensile test fixture disclosed in the present invention can be found in the prior art and will not be described in detail here.

[0046] Correspondingly, an embodiment of the present invention also provides a tensile performance testing machine, including a testing machine body and a segment bolt tensile test fixture in any of the above embodiments, the testing machine body is provided with a first chuck and a second chuck arranged opposite to each other, wherein an end of the first base 11 away from the nut end 31 is clamped on the first chuck, and an end of the second base 21 away from the threaded end 32 is clamped on the second chuck.

[0047] In this embodiment, thanks to the improvement of the above-mentioned segment bolt tensile test fixture, the tensile performance testing machine of this embodiment can achieve the same technical effect as the above-mentioned segment bolt tensile test fixture, which will not be repeated here.

[0048] It should be noted that other contents of the tensile performance testing machine of this embodiment can be referred to in the prior art and will not be described in detail here.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A segment bolt tensile test fixture, characterized in that: It includes a first clamp assembly for fixing the nut end of the arc bolt to be tested and a second clamp assembly for fixing the threaded end of the arc bolt to be tested, the first clamp assembly includes a first base and a limiting sleeve, the first end of the limiting sleeve is movably connected to the first base and has a first through hole therein for the nut end to pass through, the second end of the limiting sleeve has a second through hole therein for the threaded end to pass through, wherein the first through hole is connected to the second through hole, and the aperture of the first through hole is larger than the aperture of the second through hole; the second clamp assembly includes a second base and a threaded sleeve, wherein one end of the threaded sleeve is movably connected to the second base, and the other end has an internal threaded hole that threadably cooperates with the threaded end.

2. The segment bolt tensile test fixture according to claim 1, characterized in that: The first clamp assembly also includes a first latch, one end of the first base has a first installation space, and the first end of the limiting sleeve is rotatably connected to the first installation space of the first base through the first latch.

3. The segment bolt tensile test fixture according to claim 1, characterized in that: The first clamp assembly also includes a first pin and a connecting rod, one end of the first base has a first installation space, the first end of the limiting sleeve is rotatably connected to the first installation space of the first base through the connecting rod and the first pin, wherein one end of the connecting rod is detachably connected to the first end of the limiting sleeve, and the other end is rotatably connected to the first installation space of the first base through the first pin.

4. The segment bolt tensile test fixture according to claim 3, characterized in that: One end of the connecting rod is threadably connected to the first end of the limiting sleeve.

5. The segment bolt tensile test fixture according to claim 1, characterized in that: The second clamp assembly also includes a second latch pin, one end of the second base has a second installation space, and one end of the threaded sleeve is rotatably connected to the second installation space of the second base through the second latch pin.

6. The segment bolt tensile test fixture according to any one of claims 1 to 5, characterized in that: The first clamp assembly further includes a washer that can be placed in the first through hole, wherein the inner diameter of the washer is larger than the outer diameter of the threaded end and smaller than the outer diameter of the nut end, and the outer diameter of the washer is larger than the aperture of the second through hole.

7. A tensile properties testing machine, characterized in that: It comprises a testing machine body and a segment bolt tensile test fixture as claimed in any one of claims 1 to 6, wherein the testing machine body is provided with a first chuck and a second chuck arranged opposite to each other, wherein an end of the first base away from the nut end is clamped on the first chuck, and an end of the second base away from the threaded end is clamped on the second chuck.

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