Positioning clamp for detecting mechanical property of external thread part

Abstract

The utility model belongs to the technical field of external thread part detection, and discloses a positioning fixture for mechanical property detection of external thread parts, which comprises an upper fixture mounting block. The clamp upper mounting block is mounted on an upper chuck of the vertical tension measuring instrument, and the part head limiting tool is mounted at the bottom end of the clamp upper mounting block in a matched manner; the clamp lower mounting block is mounted on a lower chuck of the vertical tension measuring instrument, and the external thread mounting block is mounted at the top end of the clamp lower mounting block in a matched manner; an external thread part to be detected is vertically arranged between the part head limiting tool and the external thread mounting block; wherein the part head limiting tool is used for limiting and fixing a part head of a to-be-detected external thread part, and the external thread mounting block is used for being in threaded connection with a rod part of the to-be-detected external thread part; according to the utility model, the external thread part to be measured is reliably fixed, so that the accuracy of a mechanical measurement result is ensured; meanwhile, parts can be prevented from falling off or jumping out in the measuring process, and potential safety hazards are greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of external thread part detection, and particularly relates to a positioning fixture for mechanical property detection of external thread parts. Background Art

[0002] For vertical tensile measurement of threads, it mainly tests the tensile strength of threaded fasteners. During the test process, general jaws are mostly used to clamp and fix the threaded fasteners to be tested, which are often applicable to standard samples with a planar structure. When using the existing general jaws to clamp and fix external thread parts such as screws and set screws, due to the small clamping surface, it is impossible to firmly and reliably fix between the jaws and the external thread parts to be tested, thereby greatly reducing the accuracy of the measurement results. Secondly, due to the deformation of the external thread parts to be tested under force, they are prone to falling off or popping out, thus posing a safety hazard of hitting and injuring the operator. Summary of the Utility Model

[0003] Aiming at the technical problems existing in the prior art, the utility model provides a positioning fixture for mechanical property detection of external thread parts to solve the technical problems of unable to firmly fix and low accuracy of measurement results when using the existing general jaws to clamp and fix external thread parts.

[0004] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0005] The utility model provides a positioning fixture for mechanical property detection of external thread parts. The positioning fixture is installed between the upper chuck and the lower chuck of a vertical tensile measuring instrument and is used for clamping and fixing the external thread parts to be tested. The positioning fixture includes a fixture upper mounting block, a part head limiting tooling, an external thread mounting block, and a fixture lower mounting block.

[0006] The fixture upper mounting block is installed on the upper chuck of the vertical tensile measuring instrument, and the part head limiting tooling is cooperatively installed at the bottom end of the fixture upper mounting block. The fixture lower mounting block is installed on the lower chuck of the vertical tensile measuring instrument, and the external thread mounting block is cooperatively installed at the top end of the fixture lower mounting block.

[0007] The external thread part to be tested is vertically arranged between the part head limiting tooling and the external thread mounting block. Among them, the part head limiting tooling is used for limiting and fixing the part head of the external thread part to be tested, and the external thread mounting block is used for being connected with the rod part of the external thread part to be tested through threads.

[0008] Further, the fixture upper mounting block includes an upper mounting block body.

[0009] The bottom end of the upper mounting block body is provided with an upper mounting groove; wherein, the open end of the upper mounting groove communicates with the bottom surface of the upper mounting block body, and both inner walls at the open end of the upper mounting groove horizontally extend towards the center of the bottom end of the upper mounting block body to form upper clamping portions;

[0010] The part head limiting tooling is coaxially arranged in the upper mounting groove, and both lower sides of the lower end of the part head limiting tooling are tightly connected to the upper surfaces of the upper clamping portions.

[0011] Furthermore, a limiting through hole is arranged at the center of the part head limiting tooling, and the limiting through hole includes an upper hole section and a lower hole section that are vertically communicated;

[0012] The upper end of the upper hole section communicates with the top surface of the part head limiting tooling, and the lower end of the lower hole section communicates with the bottom surface of the part head limiting tooling; wherein, the diameter of the upper hole section is larger than that of the lower hole section;

[0013] The part head of the external thread part to be measured is placed in the upper hole section, and the lower end surface of the part head of the external thread part to be measured is tightly connected to the upper end surface of the lower hole section; the rod portion of the external thread part to be measured penetrates through the lower hole section and extends vertically downward to the lower side of the bottom end of the part head limiting tooling.

[0014] Furthermore, the depth of the upper hole section is adapted to the height of the part head of the external thread part to be measured, and the diameter of the upper hole section is adapted to the diameter of the part head of the external thread part to be measured.

[0015] Furthermore, the external thread part to be measured is a screw or a set screw.

[0016] Furthermore, the fixture upper mounting block further includes an upper connecting portion; the upper connecting portion is vertically arranged at the top end of the upper mounting block body; wherein, the bottom end of the upper connecting portion is fixedly connected to the center of the top end of the upper mounting block body, and the top end of the upper connecting portion is used for connecting with the upper chuck of a vertical tensile measuring instrument.

[0017] Furthermore, the fixture lower mounting block includes a lower mounting block body;

[0018] The top end of the lower mounting block body is provided with a lower mounting groove; wherein, the open end of the lower mounting groove communicates with the top surface of the lower mounting block body, and both inner walls at the open end of the lower mounting groove extend towards the center of the top end of the lower mounting block body to form lower clamping portions;

[0019] The lower end of the external thread mounting block is cooperatively arranged in the lower mounting groove, and the upper end of the external thread mounting block extends to the outside of the open end of the lower mounting groove; wherein, both lower sides of the lower end of the external thread mounting block are tightly connected to the lower clamping portions.

[0020] Furthermore, the external thread mounting block includes a fixed block and a connecting block;

[0021] The fixed block is fitted in the lower mounting groove, and both sides of the upper end surface of the fixed block are tightly abutted and connected to the lower end surface of the lower clamping portion; the lower end of the connecting block is connected to the upper end surface of the fixed block, and the top end of the connecting block extends to the outside of the opening end of the lower mounting groove; wherein, an assembly hole is provided at the center of the top end of the connecting block, and the lower end of the rod portion of the external thread part to be measured is fitted and installed in the assembly hole.

[0022] Furthermore, internal threads are provided on the inner wall of the assembly hole, and the internal threads are in mating connection with the external threads on the rod portion of the external thread part to be measured.

[0023] Furthermore, the lower mounting block of the fixture further includes a lower connecting portion, and the lower connecting portion is vertically provided at the bottom end of the lower mounting block body; wherein, the top end of the lower connecting portion is fixedly connected to the center of the bottom end of the lower mounting block body, and the bottom end of the lower connecting portion is used for connecting with the lower chuck of the vertical tensile measuring instrument.

[0024] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0025] The positioning fixture for detecting the mechanical properties of external thread parts provided by the present utility model installs the part head limiting tooling on the upper chuck of the vertical tensile measuring instrument by using the upper mounting block of the fixture, and installs the external thread mounting block on the lower chuck of the vertical tensile measuring instrument by using the lower mounting block of the fixture, realizing the stable installation of the positioning fixture and the vertical tensile measuring instrument; using the part head limiting tooling to limit and fix the part head of the external thread part to be measured, and connecting the rod portion of the external thread part to be measured with the external thread mounting block through threads, improving the clamping surface of the external thread part, realizing the reliable fixation of the external thread part to be measured, and further ensuring the accuracy of the mechanical measurement result; at the same time, it can avoid the part falling off or popping out during the measurement process, greatly reducing the safety hazard. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic diagram of the use state of the positioning fixture for detecting the mechanical properties of external thread parts described in the present utility model;

[0028] Figure 2Schematic structural diagram of the mounting block on the fixture in the present utility model;

[0029] Figure 3 Schematic structural diagram of the lower mounting block on the fixture in the present utility model;

[0030] Figure 4 Schematic assembly structure diagram of the part head limiting tooling, the external thread part to be measured, and the external thread mounting block in the present utility model.

[0031] Wherein, 1 is the upper mounting block on the fixture, 2 is the part head limiting tooling, 3 is the external thread mounting block, 4 is the lower mounting block on the fixture, 5 is the external thread part to be measured; 11 is the upper mounting block body, 12 is the upper connecting part, 13 is the upper clamping part; 21 is the limiting through hole; 31 is the fixing block, 32 is the connecting block; 41 is the lower mounting block body, 42 is the lower connecting part, 43 is the lower clamping part. Detailed implementation manners

[0032] In order to make the technical problems, technical solutions, and beneficial effects solved by the present application clearer and more understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application; obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0033] The present utility model provides a positioning fixture for detecting the mechanical properties of external thread parts. The positioning fixture is installed between the upper chuck and the lower chuck of a vertical tensile measuring instrument and is used to clamp and fix the external thread part to be measured during the vertical tensile measurement process; wherein, the external thread part to be measured includes a part head and a rod part connected to the part head, and an external thread is provided on the outer side of the rod part; preferably, the external thread part to be measured includes a screw and a set screw.

[0034] As shown in the attached Figures 1-4 figure, the positioning fixture for detecting the mechanical properties of external thread parts in the present utility model includes an upper mounting block 1 on the fixture, a part head limiting tooling 2, an external thread mounting block 3, and a lower mounting block 4 on the fixture; the mounting block 1 on the fixture is installed on the upper chuck of the vertical tensile measuring instrument, and the part head limiting tooling 2 is cooperatively installed at the bottom end of the upper mounting block 1 on the fixture; the lower mounting block 4 on the fixture is installed on the lower chuck of the vertical tensile measuring instrument, and the external thread mounting block 3 is cooperatively installed at the top end of the lower mounting block 4 on the fixture; the external thread part 5 to be measured is vertically arranged between the part head limiting tooling 2 and the external thread mounting block 3; wherein, the part head limiting tooling 2 is used to limit and fix the part head of the external thread part 5 to be measured, and the external thread mounting block 3 is used to be threadedly connected with the rod part of the external thread part 5 to be measured.

[0035] The mounting block 1 on the fixture includes a mounting block body 11 and an upper connecting portion 12. A mounting groove is provided at the bottom end of the mounting block body 11, and the mounting groove is a concave groove with a downward opening. Among them, the opening end of the mounting groove communicates with the bottom surface of the mounting block body 11; on both inner walls of the opening end of the mounting groove, horizontal extensions are formed towards the center of the bottom end of the mounting block body 11 to form upper clamping portions 13, and the upper clamping portions 13 are used to limit and fix the part head limiting tooling 2; the upper connecting portion 12 is vertically provided at the top end of the mounting block body 11 and is used to connect the mounting block body 11 with the upper chuck of the vertical tensile measuring instrument; among them, the bottom end of the upper connecting portion 12 is fixedly connected to the center of the top end of the mounting block body 11, and the top end of the upper connecting portion 12 is used to connect with the upper chuck of the vertical tensile measuring instrument.

[0036] It should be noted that an upper mounting cavity is formed between the upper clamping portions 13 on both sides of the opening end of the mounting groove and the inner wall of the mounting groove, and the upper mounting cavity serves as the installation space for the part head limiting tooling 2; among them, the ends of the two upper clamping portions 13 are spaced apart to form an upper channel, and the upper channel serves as the through channel for the rod portion of the external thread part 5 to be measured; one end or both ends of the mounting groove communicate with the side wall of the mounting block body 11, serving as the disassembly and assembly channel for the part head limiting tooling 2, so as to assemble different models of part head limiting tooling 2 into the mounting block body 11.

[0037] The part head limiting tooling 2 is coaxially arranged in the mounting groove, and the two lower sides of the part head limiting tooling 2 are tightly connected to the upper surfaces of the upper clamping portions 13 respectively; specifically, the part head limiting tooling 2 is assembled into the upper mounting cavity along the disassembly and assembly channel of the part head limiting tooling 2, and it is ensured that the two lower sides of the part head limiting tooling 2 are respectively located above the upper surfaces of the two upper clamping portions 13.

[0038] A limiting through hole 21 is provided at the center of the part head limiting tooling 2, and the limiting through hole 21 runs through along the vertical center line of the part head limiting tooling 2; the limiting through hole 21 includes an upper hole section and a lower hole section that are connected up and down. The upper end of the upper hole section communicates with the top surface of the part head limiting tooling 2, the lower end of the upper hole section is connected to the upper end of the lower hole section, and the lower end of the lower hole section communicates with the bottom surface of the part head limiting tooling 2; among them, the diameter of the upper hole section is larger than that of the lower hole section, that is, the upper hole section and the lower hole section form a stepped hole to limit and fix the head of the external thread part 5 to be measured.

[0039] Specifically, the part head of the external thread part 5 to be measured is placed inside the upper hole section, and the lower end face of the part head of the external thread part 5 to be measured is tightly abutted and connected to the upper end face of the lower hole section; the rod part of the external thread part head 5 to be measured penetrates through the lower hole section and extends vertically downward through the upper channel and then to below the bottom end of the part head limiting tooling 2, and then is cooperatively connected with the external thread mounting block 3; wherein, the depth of the upper hole section is adapted to the height of the part head of the external thread part 5 to be measured, and the diameter of the upper hole section is adapted to the diameter of the part head of the external thread part 5 to be measured.

[0040] The external thread mounting block 3 includes a fixed block 31 and a connecting block 32, and the fixed block 31 is coaxially arranged at the lower end of the connecting block 32; wherein, the fixed block 31 is used for being cooperatively connected with the lower mounting block 4 of the fixture, the lower end of the connecting block 32 is connected to the upper end face of the fixed block 31, an assembly hole is arranged at the center of the top end of the connecting block 32, and the lower end of the rod part of the external thread part 5 to be measured is cooperatively installed in the assembly hole to realize a reliable connection between the external thread part 5 to be measured and the external thread mounting block 3; specifically, internal threads are arranged on the inner wall of the assembly hole, and the internal threads are cooperatively connected with the external threads on the rod part of the external thread part 5 to be measured.

[0041] It should be noted that the cross-sectional width dimension of the fixed block 31 is greater than the cross-sectional width dimension of the connecting block 32, that is, the cross-section of the external thread mounting block 3 is in a convex shape structure, so as to be cooperatively connected with the lower mounting block 4 of the fixture through the fixed block 31 to realize a reliable connection between the external thread mounting block 3 and the lower mounting block 4 of the fixture.

[0042] The lower mounting block 4 of the fixture includes a lower mounting block body 41 and a lower connecting part 42. A lower mounting groove is arranged at the bottom end of the lower mounting block body 41, and the lower mounting groove is a concave groove with an upward opening; wherein, the opening end of the lower mounting groove communicates with the top surface of the lower mounting block 41; the inner walls on both sides of the opening end of the lower mounting groove horizontally extend towards the center of the bottom end of the lower mounting block body 41 to form a lower clamping part 43, and the lower clamping part 43 is used for limiting and fixing the external thread mounting block 3; the lower connecting part 42 is vertically arranged at the bottom end of the lower mounting block body 41 and is used for connecting the lower mounting block body 41 with the lower chuck of the vertical tensile measuring instrument; wherein, the top end of the lower connecting part 42 is fixedly connected to the center of the bottom end of the lower mounting block body 41, and the bottom end of the lower connecting part 42 is used for being connected with the lower chuck of the vertical tensile measuring instrument.

[0043] It should be noted that a lower mounting cavity is formed between the lower clamping portions 43 on both sides of the open end of the lower mounting groove and the inner wall of the lower mounting groove. The lower mounting cavity serves as the mounting space for the fixed block 31 in the external thread mounting block 3. Among them, the ends of the two lower clamping portions 43 are spaced apart to form a lower channel, and the lower channel serves as the through channel for the connecting block 32 in the external thread mounting block 3. One end or both ends of the lower mounting groove communicate with the side wall of the lower mounting block body 41, serving as the disassembly and assembly channel for the external thread mounting block 3, so as to assemble different models of external thread mounting blocks 3 into the lower mounting block body 41.

[0044] Specifically, the fixed block 31 is cooperatively arranged in the lower mounting groove, and the upper end surfaces on both sides of the fixed block 31 are tightly abutted and connected to the lower end surfaces of the lower clamping portions 43. That is, the fixed block 31 is assembled into the lower mounting cavity along the disassembly and assembly channel of the external thread mounting block 3, and it is ensured that both sides of the upper end of the fixed block 31 are respectively located below the lower surfaces of the two lower clamping portions 44. The lower end of the connecting block 32 is connected to the upper end surface of the fixed block 31, and the top end of the connecting block 32 extends above the top end of the lower mounting body 41 after passing through the lower channel, and then is threadedly connected to the rod portion of the external thread part 5 to be measured.

[0045] It should be noted that the differences between different models of the part head limiting tooling 2 are as follows: the sizes of the limiting through holes 21 in the part head limiting tooling 2 are different to meet the requirements for limiting and fixing the part heads of external thread parts of different specifications. The differences between different models of the external thread mounting block 3 are that the sizes of the assembly holes and the specifications of the internal threads in the external thread mounting block 3 are different to meet the requirements for limiting and fixing the rod portions of external thread parts of different specifications.

[0046] Working principle:

[0047] When using the positioning fixture for mechanical property testing of external thread parts of the present utility model, the part head of the external thread part 5 to be measured is assembled into the limiting through hole of the part head limiting tooling 2, and the rod portion of the external thread part 5 to be measured extends vertically downward to below the bottom end of the part head limiting tooling 2. Then, the lower end of the rod portion of the external thread part 5 to be measured is cooperatively assembled into the assembly hole of the external thread mounting block 3 and is fixedly connected by threads. After that, the part head limiting tooling 2 is assembled into the upper mounting block 1 of the fixture, and the external thread mounting block 3 is assembled into the lower mounting block 4 of the fixture. Finally, the positioning fixture with the external thread part 5 to be measured is integrally installed between the upper chuck and the lower chuck of the vertical tensile measuring instrument to start the vertical tensile measurement test.

[0048] For the positioning fixture described in the present utility model, by connecting the mounting block 1 on the fixture to the upper chuck of the vertical tensile measuring instrument and connecting the lower mounting block of the fixture to the lower chuck, the stable installation of the fixture on the tensile measuring instrument is achieved; by using the part head limiting tooling and the external thread mounting block to accurately limit and fix the head and rod of the external thread part to be measured respectively, it is ensured that the part will not shift or loosen due to uneven force during the test, thereby improving the accuracy and reliability of the test.

[0049] In the present utility model, the external thread mounting block is connected to the rod of the part to be measured by a threaded connection method, enabling the fixture to be applicable to external thread parts of various specifications and sizes, enhancing the versatility and flexibility of the fixture; at the same time, the part head limiting tooling can also adapt to the shapes and sizes of different part heads by adjusting or replacing components of different sizes; secondly, when the fixture clamps the part to be measured, through reasonable structural design and material selection, it can reduce damage to the part surface, protect the integrity of the part, and extend its service life; during the tensile test process, the stable fixture can ensure that the part to be measured will not suddenly break or fly out when subjected to tensile force, thereby avoiding possible injuries and losses to operators and equipment and improving the safety of the test process.

[0050] The positioning fixture for the mechanical property detection of external thread parts described in the present utility model uses the part head limiting tooling to limit and fix the part head of the external thread part to be measured, and connects the rod of the external thread part to be measured to the external thread mounting block by threads, which can improve the accurate vertical tensile measurement of the external thread part; at the same time, it can effectively prevent the part from falling off or popping out during the test due to insecure and unreliable clamping, avoiding the risk of injury to the test personnel; the overall fixture structure is reasonably designed, and the installation and disassembly processes are simple and fast, reducing the operation difficulty and time cost.

[0051] The above embodiments are only one of the implementation manners capable of realizing the technical solution of the present utility model. The scope of protection required by the present utility model is not only limited by this embodiment, but also includes any changes, substitutions and other implementation manners that are easily conceivable by those skilled in the art within the technical scope disclosed by the present utility model.

Claims

1. A positioning fixture for testing the mechanical properties of external threaded parts, characterized in that: The positioning fixture is installed between the upper clamp and the lower clamp of the vertical tension measuring instrument, and is used to clamp and fix the external threaded part (5) to be tested; the positioning fixture comprises an upper fixture mounting block (1), a part head limiting tool (2), an external thread mounting block (3) and a lower fixture mounting block (4); The fixture upper mounting block (1) is mounted on the upper clamp of the vertical tension measuring instrument, and the part head limiting tool (2) is mounted on the bottom end of the fixture upper mounting block (1); the fixture lower mounting block (4) is mounted on the lower clamp of the vertical tension measuring instrument, and the external thread mounting block (3) is mounted on the top end of the fixture lower mounting block (4); The externally threaded part (5) to be tested is vertically arranged between the part head limiting fixture (2) and the externally threaded mounting block (3); wherein the part head limiting fixture (2) is used to limit and fix the part head of the externally threaded part (5) to be tested, and the externally threaded mounting block (3) is used to be connected to the rod portion of the externally threaded part (5) to be tested via threads.

2. A positioning fixture for testing mechanical properties of external threaded parts according to claim 1, characterized in that: The fixture upper mounting block (1) comprises an upper mounting block body (11); An upper mounting groove is provided at the bottom end of the upper mounting block body (11); wherein the opening end of the upper mounting groove is connected to the bottom surface of the upper mounting block body (11), and the inner walls on both sides of the opening end of the upper mounting groove extend horizontally toward the bottom center of the upper mounting block body (11) to form an upper clamping portion (13); The part head limiting fixture (2) is coaxially arranged in the upper mounting groove, and both sides of the lower end of the part head limiting fixture (2) are respectively tightly connected to the upper surface of the upper clamping part (13).

3. A positioning fixture for testing mechanical properties of external threaded parts according to claim 2, characterized in that: A limiting through hole (21) is arranged at the center of the part head limiting tooling (2), and the limiting through hole (21) comprises an upper hole section and a lower hole section which are connected up and down; The upper end of the upper hole section is connected to the top surface of the part head limiting fixture (2), and the lower end of the lower hole section is connected to the bottom surface of the part head limiting fixture (2); wherein the diameter of the upper hole section is greater than the diameter of the lower hole section; The part head of the externally threaded part (5) to be measured is placed in the upper hole section, and the lower end surface of the part head of the externally threaded part (5) to be measured is tightly connected to the upper end surface of the lower hole section; the rod of the externally threaded part (5) to be measured passes through the lower hole section and extends vertically downward to below the bottom end of the part head limiting tool (2).

4. A positioning fixture for testing mechanical properties of external threaded parts according to claim 3, characterized in that: The depth of the upper hole section is adapted to the part head height of the external threaded part (5) to be measured, and the diameter of the upper hole section is adapted to the part head diameter of the external threaded part (5) to be measured.

5. A positioning fixture for testing mechanical properties of external threaded parts according to claim 3, characterized in that: The external threaded part (5) to be tested is a screw or a top screw.

6. A positioning fixture for testing mechanical properties of external threaded parts according to claim 2, characterized in that: The fixture upper mounting block (1) further comprises an upper connecting portion (12); the upper connecting portion (12) is vertically arranged at the top end of the upper mounting block body (11); wherein the bottom end of the upper connecting portion (12) is fixedly connected to the top center of the upper mounting block body (11), and the top end of the upper connecting portion (12) is used to be connected to the upper clamp of a vertical tension measuring instrument.

7. A positioning fixture for testing mechanical properties of external threaded parts according to claim 1, characterized in that: The clamp lower mounting block (4) comprises a lower mounting block body (41); A lower mounting groove is provided at the top of the lower mounting block body (41); wherein the opening end of the lower mounting groove is connected to the top surface of the lower mounting block body (41), and the inner walls on both sides of the opening end of the lower mounting groove extend toward the top center of the lower mounting block body (41) to form a lower clamping portion (43); The lower end of the external thread mounting block (3) is arranged in cooperation with the lower mounting groove, and the upper end of the external thread mounting block (3) extends to the outside of the opening end of the lower mounting groove; wherein, both sides of the lower end of the external thread mounting block (3) are tightly connected to the lower clamping portion (43).

8. A positioning fixture for testing mechanical properties of external threaded parts according to claim 7, characterized in that: The external thread mounting block (3) comprises a fixing block (31) and a connecting block (32); The fixing block (31) is arranged in cooperation with the lower mounting groove, and the two sides of the upper end surface of the fixing block (31) are tightly connected with the lower end surface of the lower clamping portion (43); the lower end of the connecting block (32) is connected with the upper end surface of the fixing block (31), and the top end of the connecting block (32) extends to the outside of the opening end of the lower mounting groove; wherein, the center of the top end of the connecting block (32) is provided with an assembly hole, and the lower end of the rod of the external threaded part (5) to be measured is mounted in cooperation with the assembly hole.

9. A positioning fixture for testing mechanical properties of external threaded parts according to claim 8, characterized in that: An internal thread is provided on the inner wall of the assembly hole, and the internal thread is matched and connected with the external thread on the rod portion of the external threaded part (5) to be tested.

10. A positioning fixture for testing mechanical properties of external threaded parts according to claim 7, characterized in that: The clamp lower mounting block (4) also includes a lower connecting portion (42), which is vertically arranged at the bottom end of the lower mounting block body (41); wherein the top end of the lower connecting portion (42) is fixedly connected to the center of the bottom end of the lower mounting block body (41), and the bottom end of the lower connecting portion (42) is used to be connected to the lower clamp of the vertical tension measuring instrument.

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