Tool for testing pre-tightening force of ring groove rivet

Abstract

The utility model discloses a pre-tightening force test tool for a ring groove rivet. The pre-tightening force test tool is composed of a pre-tightening assembly and a test assembly. The pre-tightening assembly comprises a test rivet and a threaded sleeve and a riveting plate for simulating the fastening connection assembly; the testing assembly comprises a double-end stud, and an upper backing plate, an axial force sensor, a lower backing plate and an arch-shaped tool which are sequentially sleeved on the double-end stud; the two ends of the stud are provided with external threads, the external threads of the stud on the outer side of the upper base plate are in threaded connection with a pre-tightening nut, and the external threads at the other end of the screw are in threaded connection with the internal threads of the threaded sleeve; the arch-shaped tool is a supporting frame and comprises a top face supporting platform and supporting arms arranged on the edge of the platform, a through hole is formed in the center of the top face supporting platform which makes contact with the lower base plate in a supporting mode, the threaded sleeve can be contained between the supporting arms, and the tail end makes contact with the plate face of the riveting plate in a supporting mode. According to the utility model, the pre-tightening force test of the ring groove rivet with a short riveting range can be realized, the disassembly is convenient, and a special forcible entry tool is not needed for forcible entry of the connecting pair.

Description

Technical Field

[0001] The utility model belongs to the technical field of riveting, in particular to a tool for testing the pre-tightening force of annular groove rivets, belonging to the riveting category (B21J) and fastener category (F16B) of metal machining. Background Art

[0002] Ring groove rivets formed by riveting using Hooke's law are a type of special fasteners that have been widely used in various industrial fields. Preload force is an important mechanical performance indicator of nuclear ring groove rivets after installation, so the test and detection of preload force has also become an important point in the development process of ring groove rivets. According to the existing test conditions and technical standards, the preload force test of ring groove rivets generally requires that the riveting range is greater than 2 times the nominal diameter before the preload force test can be carried out.

[0003] According to the current actual usage and customer needs, it is necessary to conduct preload test on the ring groove rivets with a shorter riveting range. However, in order to ensure the test progress, the large-range axial force sensor is often designed with a larger thickness, which makes it impossible for the conventional preload detection method to detect the ring groove rivets with a riveting range of less than 2 times the nominal diameter. Therefore, it is necessary to design and develop a preload test tool for ring groove rivets to meet the preload detection of ring groove rivets with a wider riveting range. Summary of the invention

[0004] The utility model discloses a preload test tool for ring groove rivets in view of the deficiencies of the prior art. The utility model aims to provide a preload test tool for ring groove rivets, which can realize the preload test riveting and disassembly of the ring groove rivets.

[0005] The utility model is realized by the following technical solutions:

[0006] A ring groove rivet preload test tool, characterized in that it is composed of a preload component and a test component;

[0007] The pre-tightening assembly includes a test rivet and a threaded sleeve and a riveting plate for simulating a fastening connection assembly; the riveting plate is a plane, and a riveting through hole for the rivet to pass through is arranged at the center; the threaded sleeve is a sleeve closed at one end, and a riveting through hole for the rivet to pass through is arranged at the center of the closed end, and an internal thread is arranged on the inner wall of the open end; the threaded sleeve and the riveting plate are fastened and riveted by rivets;

[0008] The test assembly includes a stud and an upper pad, an axial force sensor, a lower pad and a bow-shaped tooling which are sequentially mounted on the stud; the stud is a screw with external threads at both ends of the screw, a pre-tightening nut is threadedly connected to the external thread of the stud on the outer side of the upper pad, and the external thread of the other end of the screw is threadedly connected to the internal thread of the threaded sleeve; the bow-shaped tooling is a support frame, including a top surface support platform with a through hole in the center that is in contact with the lower pad, and support arms arranged on the edge of the platform, the threaded sleeve can be accommodated between the support arms, and the ends are in contact with the riveted plate surface support.

[0009] Furthermore, the axial force sensor is a cylindrical sensor with a central opening, the upper pad and the lower pad have the same structure, and the plane thereof is larger than the end plane of the cylindrical axial force sensor.

[0010] Furthermore, the bow-shaped tooling is a double-arm bow-shaped support device with a symmetrical structure, including a top surface support platform with a through hole in the center, the diameter of the through hole is larger than the diameter of the stud, and support arms with bow structures are symmetrically arranged on both sides of the platform, and a threaded sleeve can be accommodated between the two support arms.

[0011] Furthermore, the end of the support arm is configured as a vertical L-shaped structure, and the plane of the L-shaped end is in supporting contact with the plane of the riveted plate to increase the contact area with the riveted plate.

[0012] The utility model is beneficial. The utility model can effectively realize the preload test of the annular groove rivet with a short riveting range. After the preload test is completed, the disassembly is also relatively convenient, and no special demolition tool is required to demolish the connection pair, thereby reducing the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the preload test tooling of the utility model;

[0014] Figure 2 It is a schematic diagram of the cross-sectional structure of the preload test fixture of the utility model;

[0015] Figure 3 It is a schematic diagram of the bow-shaped tooling of the utility model;

[0016] Figure 4 It is a schematic diagram of the cross section of the bow-shaped tooling of the utility model;

[0017] Figure 5 It is a schematic cross-sectional view of the threaded sleeve of the utility model;

[0018] Figure 6 It is a schematic diagram of the double-ended stud of the utility model;

[0019] Figure 7 This is a schematic diagram of the ring groove rivet of the utility model;

[0020] Figure 8 It is a schematic diagram of the sleeve ring of the utility model;

[0021] Figures 9 to 14 It is a schematic diagram of the preload force test process of the utility model.

[0022] In the figure, 1 is a pre-tightening nut, 2 is an upper pad, 3 is an axial force sensor, 4 is a lower pad, 5 is a bow-shaped tooling, 6 is a stud, 7 is a threaded sleeve, 8 is a riveting plate, 9 is a collar, and 10 is a rivet. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies identical or similar to the present invention do not exceed the scope of protection of the present invention.

[0024] Combined with the attached pictures.

[0025] like Figures 1 to 8 As shown, the utility model is used for a ring groove rivet preload test tool, including a preload nut 1, an upper pad 2, an axial force sensor 3, a lower pad 4, a bow-shaped tool 5, a stud 6, a threaded sleeve 7, a riveting plate 8, a collar 9, and a ring groove rivet 10.

[0026] A threaded sleeve 7 is provided as the upper connecting piece of the test connecting piece. The inner thread of the threaded sleeve 7 cooperates with the lower thread of the stud 6 . A through hole is provided at the lower end thereof for the ring groove rivet 10 to pass through to realize riveting with the riveting plate 8 .

[0027] The riveted plate 8 of the flat plate structure is provided as the lower side coupling piece of the test coupling piece.

[0028] The axial force sensor 3 converts the preload force of the annular groove rivet 10 into an electrical signal and outputs it to a computer signal acquisition page, thereby reading the test result.

[0029] The upper pad 2 and the lower pad 4 have the same specifications, and their diameters are larger than the end diameter of the axial force sensor 3 to ensure that the axial force sensor 3 is evenly stressed. The center hole diameters of the upper pad 2 and the lower pad 4 are larger than the rod diameter of the stud 6.

[0030] The internal thread of the pre-tightening nut 1 cooperates with the upper thread of the stud 6, and the pre-tightening nut 1 is driven to rotate by an electric torque wrench to make the upper end surface of the upper pad 2 fit with the lower end surface of the pre-tightening nut 1; the lower end of the stud 6 is threadedly connected with the threaded sleeve 7, and after the rivet 10 pre-tightens the threaded sleeve 7 and the riveted plate 8, the pre-tightening force of the threaded sleeve 7 of the upper connecting part is transmitted to the axial force sensor 3 through the stud 6, the pre-tightening nut 1 and the upper pad 2.

[0031] The bow-shaped fixture 5 is used to transmit the preload force of the riveted plate 8 of the lower connecting part. After the rivet 10 preloads and tightens the threaded sleeve 7 and the riveted plate 8, the preload force of the riveted plate 8 of the lower connecting part is transmitted to the axial force sensor 3 through the bow-shaped fixture 5 and the upper pad 2. The bow-shaped fixture 5 is a double-arm bow-shaped support device with a symmetrical structure, including a top surface support platform with a through hole in the center. The through hole diameter is larger than the diameter of the stud 6, so that the stud 6 can pass freely; support arms with bow structures are symmetrically arranged on both sides of the platform, and the threaded sleeve 7 can be accommodated between the two support arms; in order to increase the stability of the support arm, the end of the support arm is set as a vertical L-shaped structure to increase the contact area with the riveted plate 8.

[0032] like Figures 9 to 14 As shown, the preload test tool test of the ring groove rivet of the utility model includes the following steps:

[0033] 1) If Fig. 9 As shown in (1), the rivet 10 is passed through one side of the threaded sleeve 7;

[0034] 2) If Fig.10 As shown in (2), screw the threaded sleeve 7 into the bottom of the stud 6;

[0035] 3) If Fig.11 (3) As shown in the figure, tighten the pre-tightening nut 1 downwards to make the pre-tightening nut 1 contact with the upper pad 2;

[0036] 4) If Fig.12 As shown in (4), the riveted plate 8 and the collar 9 are respectively passed through the annular groove rivet 10, and riveted by a special riveting tool. After the riveting is formed, the preload force test result is read by the electrical signal output by the axial force sensor 3;

[0037] 5) If Fig.13 As shown in (5), the pre-tightening nut 1 is loosened in the reverse direction by a torque wrench or other tool to remove the pre-tightening force of the connection pair;

[0038] 6) If Fig.14 As shown in (6), the threaded sleeve 7 is reversely unscrewed from the lower end of the stud 6, and the annular groove rivet 10 is pressed off by a universal testing machine so as to carry out the next preload test.

Claims

1. A ring groove rivet preload test tool, characterized in that: It consists of a preload component and a test component; The pre-tightening assembly includes a test rivet and a threaded sleeve and a riveting plate for simulating a fastening connection assembly; the riveting plate is a plane, and a riveting through hole for the rivet to pass through is arranged at the center; the threaded sleeve is a sleeve closed at one end, and a riveting through hole for the rivet to pass through is arranged at the center of the closed end, and an internal thread is arranged on the inner wall of the open end; the threaded sleeve and the riveting plate are fastened and riveted by rivets; The test assembly includes a stud and an upper pad, an axial force sensor, a lower pad and a bow-shaped tooling which are sequentially mounted on the stud; the stud is a screw with external threads at both ends of the screw, a pre-tightening nut is threadedly connected to the external thread of the stud on the outer side of the upper pad, and the external thread of the other end of the screw is threadedly connected to the internal thread of the threaded sleeve; the bow-shaped tooling is a support frame, including a top surface support platform with a through hole in the center that is in contact with the lower pad, and support arms arranged on the edge of the platform, the threaded sleeve can be accommodated between the support arms, and the ends are in contact with the riveted plate surface support.

2. The ring groove rivet preload test tool according to claim 1, characterized in that: The axial force sensor is a cylindrical sensor with a central opening, the upper pad and the lower pad have the same structure, and the plane thereof is larger than the end plane of the cylindrical axial force sensor.

3. The ring groove rivet preload test tool according to claim 2, characterized in that: The bow-shaped tooling is a double-arm bow-shaped support device with a symmetrical structure, including a top surface support platform with a through hole in the center, the diameter of the through hole is larger than the diameter of the stud, and support arms with bow structures are symmetrically arranged on both sides of the platform, and a threaded sleeve can be accommodated between the two support arms.

4. The ring groove rivet preload test tool according to claim 3, characterized in that: The end of the support arm is arranged as a vertical L-shaped structure, and the plane of the L-shaped end is in supporting contact with the plane of the riveted plate.

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