Detection tool for dovetail bolt tensile test

Abstract

The utility model discloses a detection tool for a dovetail bolt tensile test, which is suitable for a dovetail bolt and comprises a dovetail head part for fixing the dovetail bolt and a first connecting piece for fixing the dovetail head part of the dovetail bolt, a bolt gasket is arranged in the first connecting piece, and the bolt gasket is matched with the outline of the dovetail head so that the bolt gasket can be tightly attached to the dovetail head. By adopting the detection tool provided by the utility model, when a dovetail bolt tensile test is carried out, the conventional operation of firstly cutting off the dovetail head of the dovetail bolt and then fixing and clamping the two ends is not needed, but the dovetail head of the dovetail bolt is fixed through the first connecting piece which is internally provided with the bolt gasket; according to the dovetail bolt tensile test completed through the detection tool, the overall performance of the dovetail bolt can be evaluated, and especially the dovetail head can be evaluated.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt tensile testing, in particular to a detection tool used for dovetail bolt tensile testing. Background Art

[0002] In subway electromechanical installations, dovetail bolts are used to match the dovetail-shaped pre-buried grooves in the segments to secure contact lines, evacuation platforms, and hydropower supports. Currently, there are no standards for dovetail bolt tensile testing methods and corresponding tooling. Due to the shape of the dovetail bolts, there are no suitable testing tools in the related art that can directly detect the overall tensile properties of the dovetail bolts. Typically, the dovetail head of the dovetail bolt is removed, and only the threaded portion of the dovetail bolt is tested. However, this method can only evaluate the threaded portion of the dovetail bolt and cannot evaluate the overall performance of the dovetail bolt, especially the dovetail head. In view of this, research and improvements are conducted to address existing problems. The present utility model aims to provide a testing tool for dovetail bolt tensile testing to address the problems raised in the above-mentioned background technology. Utility Model Content

[0003] In order to overcome the technical problems described in the prior art, the purpose of the present invention is to provide a mouthpiece for endotracheal intubation.

[0004] The utility model provides a detection tool for tensile testing of dovetail bolts, which is suitable for dovetail bolts and includes a dovetail head for fixing the dovetail bolt and a first connecting member for fixing the dovetail head of the dovetail bolt; wherein a bolt washer is arranged inside the first connecting member, and the bolt washer is adapted to the contour of the dovetail head so as to be able to fit tightly with the dovetail head.

[0005] As a preferred technical solution, the first connecting member includes:

[0006] a first sleeve configured with a connected first pull rod and a first threaded section having an external thread structure;

[0007] The second sleeve is provided with a receiving cavity for receiving the dovetail head and the bolt washer, and the side wall of the receiving cavity is provided with threads so that the first threaded section of the first sleeve can be screwed into the second sleeve.

[0008] As a preferred technical solution, one end of the bolt washer is a plane to fit with the bottom of the accommodating cavity, and the end of the bolt washer facing away from the bottom of the accommodating cavity is a stepped surface to adapt to the dovetail head contour; wherein, the center of the bolt washer and the center of the bottom of the accommodating cavity are both provided with through holes for the threaded rod to pass through.

[0009] As a preferred technical solution, the side wall of the accommodating cavity is fully covered with threads, so that when the first sleeve is screwed into the second sleeve, it can abut the dovetail head located at the bottom of the accommodating cavity.

[0010] As a preferred technical solution, the end of the bolt washer that fits the bottom of the accommodating cavity is rounded so that the bottom of the accommodating cavity is evenly stressed.

[0011] As a preferred technical solution, the bolt washer and the second sleeve are separate structures, so that the detection tool can replace the bolt washers of different sizes.

[0012] As a preferred technical solution, the first sleeve and the second sleeve are connected by fine-pitch threads, and the two are heat-treated to meet the tensile bearing capacity requirements of the bolts.

[0013] As a preferred technical solution, the second connecting member includes a connected first pull rod and a second threaded segment with an internal thread groove, and the threaded rod can be screwed into the second threaded segment to achieve connection.

[0014] In summary, the present invention has the following technical effects:

[0015] The present invention provides a test fixture for a tensile test of a dovetail bolt, which is suitable for dovetail bolts and includes a dovetail head for fixing the dovetail bolt, and a first connecting member for fixing the dovetail head of the dovetail bolt; wherein a bolt washer is disposed inside the first connecting member, and the bolt washer is adapted to the contour of the dovetail head so as to be able to fit tightly with the dovetail head. When the test fixture of the present invention is used, when performing a tensile test on a dovetail bolt, it is not necessary to first cut off the dovetail head of the dovetail bolt and then perform the conventional operation of fixing and clamping the two ends. Instead, the dovetail head of the dovetail bolt is fixed by the first connecting member with the bolt washer disposed inside, that is, the dovetail bolt is retained as a whole for testing. The tensile test of the dovetail bolt completed using this test fixture can evaluate the overall performance of the dovetail bolt, especially the dovetail head. Therefore, compared with the existing dovetail bolt tensile test technology, the test fixture for a tensile test of a dovetail bolt provided by the present invention has obvious technical advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1is a schematic diagram of an assembly of a detection tool for a dovetail bolt tensile test and a dovetail bolt provided by some embodiments;

[0018] Figure 2 is a schematic structural diagram of a dovetail bolt provided in some embodiments;

[0019] Figure 3 is a schematic structural diagram of a first connecting member provided in some embodiments;

[0020] Figure 4 is a schematic structural diagram of a bolt washer provided in some embodiments;

[0021] Figure 5 is a schematic structural diagram of a second connecting member provided in some embodiments;

[0022] The meanings of the reference numerals are as follows:

[0023] 1-first connecting member, 11-first sleeve, 111-first pull rod, 112-first threaded section, 12-second sleeve;

[0024] 2-second connecting member, 21-second threaded segment, 22-second pull rod;

[0025] 31- dovetail head, 32- threaded rod;

[0026] 4-bolt washer, 41-step surface. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings to clearly and completely describe the technical solution in this embodiment. The embodiment described herein is for illustrative purposes only and is not intended to limit the scope of protection of the present utility model. Therefore, it should be understood that various modifications and changes can be made to this embodiment without departing from the scope of protection of the present utility model.

[0028] In the description of the present invention, unless otherwise expressly specified or limited, the term "and / or" includes any and all combinations of one or more of the associated listed items. Unless otherwise specified or explained, the terms "connected" and "fixed" should be understood broadly. For example, "connected" can mean fixed, removable, or integral; "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0029] Furthermore, in the description of the present invention, it should be understood that the directional words described in the present embodiment are described based on the angles shown in the accompanying drawings and should not be understood as limiting the present embodiment. It should also be understood that, in the context, when an element or feature is mentioned as being connected to another element(s), it can be connected not only directly to the other element(s), but also indirectly to the other element(s) through an intermediate element.

[0030] Before introducing the technical solution of the present invention, it is necessary to explain the background of the invention. It is common that in subway electromechanical installation, dovetail bolts are used to match the embedded grooves of the dovetail tooth shape in the pipe segments to fix the contact network, evacuation platforms and hydropower supports, etc. At present, there is no standard to stipulate the tensile test method and corresponding tooling for dovetail bolts. Due to the shape of the dovetail bolts in the related art, there is no suitable detection tooling that can directly detect the overall tensile performance of the dovetail bolts. Usually, the dovetail head of the dovetail bolt is cut off and only the threaded part of the dovetail bolt is tested. However, this method can only evaluate the threaded part of the dovetail bolt, and cannot evaluate the overall performance of the dovetail bolt, especially the dovetail head. In order to overcome the technical problems of the above-mentioned prior art, the present invention aims to provide a detection tooling for the tensile test of dovetail bolts.

[0031] The present invention provides an exemplary embodiment of a dovetail bolt tensile test device, which is suitable for dovetail bolts. Figures 1 to 5 This testing fixture includes a dovetail head 31 for fixing a dovetail bolt, and a first connecting member 1 for fixing the dovetail head 31 of the dovetail bolt; wherein, a bolt washer 4 is disposed inside the first connecting member 1, and the bolt washer 4 is adapted to the contour of the dovetail head 31 so as to fit tightly with the dovetail head 31. Specifically, this testing fixture is composed of two parts, upper and lower, to fix and clamp the dovetail bolt as a whole, avoiding the conventional operation of first cutting off the dovetail head 31 of the dovetail bolt and then fixing and clamping the two ends. Instead, the dovetail head 31 of the dovetail bolt is fixed by the first connecting member 1 with the bolt washer 4 disposed inside, that is, the dovetail bolt is retained as a whole for testing, which can achieve the evaluation of the overall performance of the dovetail bolt, especially the evaluation of the dovetail head 31.

[0032] The first connecting member 1 and the second connecting member 2 of the detection fixture will be described below.

[0033] First connecting piece 1:

[0034] See also Figures 1 to 4 , the first connecting member 1 includes:

[0035] A first sleeve 11 is provided with a first pull rod 111 and a first threaded section 112 having an external thread structure;

[0036] The second sleeve 12 is provided with an accommodating cavity for accommodating the dovetail head 31 and the bolt washer 4 . The side wall of the accommodating cavity is provided with threads so that the first threaded section 112 of the first sleeve 11 can be screwed into the second sleeve 12 .

[0037] It should be noted that one end of the bolt washer 4 is a plane to fit with the bottom of the accommodating cavity, and the end of the bolt washer 4 facing away from the bottom of the accommodating cavity is a stepped surface 41 to adapt to the contour of the dovetail head 31; wherein, the center of the bolt washer 4 and the center of the bottom of the accommodating cavity are both provided with through holes for the threaded rod 32 to pass through.

[0038] It should be understood that the first connector 1 is an assembly comprising a first sleeve 11 and a second sleeve 12 connected by threads. Its function is to securely clamp the dovetail head 31 of the dovetail bolt. Specifically, during the securing operation, the threaded rod 32 of the dovetail bolt is passed through the through-hole of the bolt washer 4, while the dovetail head 31 is mated and abutted against the bolt washer 4. The threaded rod 32 of the dovetail bolt is then passed through the through-hole of the accommodating cavity, thereby achieving the initial securing of the dovetail head 31, which is covered by the bolt washer 4.

[0039] Based on the above preliminary fixation of the dovetail head 31, as a preferred technical solution, please refer to Figures 1 to 4 The sidewalls of the accommodating cavity are completely covered with threads, so that when the first sleeve 11 is screwed into the second sleeve 12, it can abut the dovetail head 31 located at the bottom of the accommodating cavity. Specifically, the first sleeve 11 is connected to the second sleeve 12 through the first threaded section 112. At the same time, the first threaded section 112 can also abut the initially fixed dovetail head 31 after being screwed in, that is, prevent the dovetail head 31 from moving before the load is applied. For further information, please refer to Figures 1 to 4 The end of the bolt washer 4 that contacts the bottom of the accommodating cavity is rounded to ensure uniform force on the bottom of the accommodating cavity. Furthermore, the bolt washer 4 and the second sleeve 12 are separate structures. By replacing different bolt washers 4 according to different dovetail bolt models, tensile tests can be completed on dovetail bolts of various sizes, effectively expanding the test range of this testing tool.

[0040] It should be noted that, as a preferred technical solution, the threaded connection between the first sleeve 11 and the second sleeve 12 adopts a fine thread connection to provide a more precise threaded connection, and the two are heat-treated to meet the requirements of the maximum specification bolt tensile bearing capacity.

[0041] Second connecting piece 2:

[0042] See also Figures 1 to 5The second connecting member 2 includes a connected first tie rod 111 and a second threaded section 21 having an internal thread groove. The threaded rod 32 can be screwed into the second threaded section 21 to achieve connection. Specifically, the second connecting member 2 is an integral structure, preferably integrally formed. First, the threaded rod 32 of the dovetail bolt is screwed into the second threaded section 21, thereby achieving fixed clamping of the threaded rod 32. After the dovetail head 31 and the threaded rod 32 are fixedly clamped by the inspection tool of the present invention, the operator will begin to gradually load the first tie rod 111 and the second tie rod 22, that is, to begin a tensile test on the dovetail bolt to study and analyze the overall mechanical properties of the dovetail bolt.

[0043] In summary, the dovetail bolt tensile test performed using this inspection tool can evaluate the overall performance of the dovetail bolt, especially the dovetail head. Therefore, compared with existing dovetail bolt tensile testing technology, the inspection tool for dovetail bolt tensile testing provided by this utility model has significant technical advantages.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A detection tool for tensile testing of dovetail bolts, suitable for dovetail bolts, characterized in that: It includes a dovetail head for fixing the dovetail bolt, and a first connecting piece for fixing the dovetail head of the dovetail bolt; wherein, a bolt washer is configured inside the first connecting piece, and the bolt washer is adapted to the contour of the dovetail head so as to fit tightly with the dovetail head.

2. The detection tool according to claim 1, characterized in that: The first connecting member includes: a first sleeve configured with a connected first pull rod and a first threaded section having an external thread structure; The second sleeve is provided with a receiving cavity for receiving the dovetail head and the bolt washer, and the side wall of the receiving cavity is provided with threads so that the first threaded section of the first sleeve can be screwed into the second sleeve.

3. The detection tool according to claim 2, characterized in that: Also included are threaded rods; One end of the bolt washer is a flat surface to fit with the bottom of the accommodating cavity, and the end of the bolt washer facing away from the bottom of the accommodating cavity is a stepped surface to adapt to the dovetail head contour; wherein, the center of the bolt washer and the center of the bottom of the accommodating cavity are both provided with through holes for the threaded rod to pass through.

4. The detection tool according to claim 3, characterized in that: The side wall of the accommodating cavity is completely covered with threads, so that the first sleeve can abut against the dovetail head located at the bottom of the accommodating cavity when the first sleeve is screwed into the second sleeve.

5. The detection tool according to claim 4, characterized in that: One end of the bolt washer that is in contact with the bottom of the accommodating cavity is rounded so that the bottom of the accommodating cavity is evenly stressed.

6. The detection tool according to claim 5, characterized in that: The bolt washer and the second sleeve are separate structures, so that the detection tool can replace the bolt washers of different sizes.

7. The detection tool according to claim 6, characterized in that: The first sleeve and the second sleeve are connected by fine thread, and the two are heat treated to meet the tensile bearing capacity requirements of the bolt.

8. The detection tool according to claim 3, characterized in that: Also comprising a second connecting member; The second connecting member includes a connected first pull rod and a second threaded section with an internal thread groove, and the threaded rod can be screwed into the second threaded section to achieve connection.

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