High-strength nut load limit evaluation device

Abstract

The utility model discloses a high-strength nut load limit evaluation device which comprises a base, a plurality of supports are arranged on the base, a frame top is arranged at one end of each support, a test hydraulic cylinder is fixedly inserted into the frame top, a tension and compression sensor is installed at the telescopic end of the test hydraulic cylinder, a fixed clamp holder is arranged on the base, and a clamping device is arranged on the fixed clamp holder. A movable clamp holder is arranged on the tension and compression sensor, and a fixed pull bowl is arranged on the fixed clamp holder; the utility model relates to the technical field of nut load testing devices, the pressing and drawing test of a nut can be realized by only assembling a tool once and only needing one device, the tedious step of replacing a clamp and the device in the traditional method is omitted, the detection efficiency is improved, and meanwhile, through the design of a limiting column and a guide groove hole, the detection precision is improved. It is ensured that the placement structure is free of radial movement or deflection in the testing process, and the testing precision is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of nut load testing devices, specifically a high-strength nut load limit assessment device. Background Technology

[0002] In numerous industrial sectors such as machinery manufacturing, construction engineering, and aerospace, high-strength nuts serve as critical fasteners, their performance directly impacting the safety and reliability of the entire structure or equipment. Currently, load limit assessment of high-strength nuts typically requires the use of various fixtures and equipment to conduct compression and pull-out tests. In the compression test, a press applies vertically downward pressure to the nut until it undergoes plastic deformation or fails, thus assessing its compressive strength. In the pull-out test, a tensile testing machine applies axial tension to the nut until it is pulled out or breaks, thereby assessing its tensile strength.

[0003] However, traditional testing methods are cumbersome and require frequent changes of fixtures and equipment, which not only increases testing costs but also reduces testing efficiency. During the testing process, the nut can usually move radially in the fixture. For example, in a tension cup guard assembly with publication number CN210401025U, the nut is set in it by a threaded part. It lacks a radially fixed structure and is prone to radial movement or skew, which further affects the testing accuracy.

[0004] While existing technologies may already offer solutions to the aforementioned problems, this case aims to provide an alternative or replacement technical solution. Utility Model Content

[0005] To address the problems mentioned in the background art, this utility model provides the following technical solution: a high-strength nut load limit assessment device, comprising a base, multiple supports on the base, a support top at one end of each support, a test hydraulic cylinder fixedly inserted on the support top, a tension / compression sensor installed on the telescopic end of the test hydraulic cylinder, a fixed clamp on the base, a movable clamp on the tension / compression sensor, a fixed pull cup on the fixed clamp, a movable pull cup on the movable clamp, and a placement structure movably provided on the fixed pull cup and the movable pull cup;

[0006] The placement structure includes a large-end threaded post, a guide slot is provided at the center of one end of the large-end threaded post, a tension ring is threaded onto the large-end threaded post, a semi-threaded support rod is provided at the center of the other end of the large-end threaded post, a washer is movably fitted onto the semi-threaded support rod, a tension nut is threaded onto the semi-threaded support rod near the washer, and a pressure nut is threaded onto one end of the semi-threaded support rod.

[0007] The fixed pull bowl includes a fixed clip head, the clip head has a stepped notch, the tension ring is movably placed inside the stepped notch, and a limit post is installed on the bottom surface of the inner side of the stepped notch, the limit post and the guide groove are matched with each other;

[0008] The movable pull bowl includes a movable clamp head, which has an opening for receiving. The gasket, pull-test nut, and pressure-test nut are movably placed inside the stepped opening.

[0009] Preferably, both the fixed clamp head and the movable clamp head are provided with a connecting post, and multiple retaining rings are provided on the connecting post along the axial direction.

[0010] Preferably, both the fixed clamp and the movable clamp include a mounting base. The mounting base has a placement groove at its center. Two clamping hydraulic cylinders are symmetrically inserted into the inner wall of the placement groove. Each clamping hydraulic cylinder has a semi-circular clamping block installed at its telescopic end. The semi-circular clamping block has a slot that matches the multiple retaining rings.

[0011] Preferably, a control panel is mounted on the base.

[0012] Preferably, a first guide rod is movably inserted into the top of the frame, and one end of the first guide rod is mounted on the movable clamp.

[0013] Preferably, a second guide rod is installed on the semi-circular clamping block, and one end of the second guide rod is movably inserted into the mounting base.

[0014] Beneficial effects

[0015] This invention provides a high-strength nut load limit assessment device, which has the following advantages compared with the prior art: only one tooling assembly is required, and only one device is needed to realize the nut compression and pull-out tests, eliminating the cumbersome steps of changing fixtures and equipment in the traditional method, improving the testing efficiency. At the same time, through the design of the limiting post and guide slot, it is ensured that the placement structure does not move radially or tilt during the test, thus improving the test accuracy. Attached Figure Description

[0016] Figure 1 This is a front sectional view of the high-strength nut load limit assessment device of this utility model.

[0017] Figure 2 This is a partial three-dimensional structural schematic diagram of a high-strength nut load limit evaluation device according to the present invention.

[0018] Figure 3 This is a partial top-view cross-sectional structural diagram of a high-strength nut load limit assessment device according to the present invention.

[0019] Figure 4 This utility model relates to a high-strength nut load limit assessment device. Figure 1 A magnified schematic diagram of the central part of the structure.

[0020] In the diagram: 1. Base, 2. Bracket, 3. Frame top, 4. Test hydraulic cylinder, 5. Tension / compression sensor, 6. Large end threaded post, 7. Tension ring, 8. Semi-threaded support rod, 9. Washer, 10. Tension test nut, 11. Compression test nut, 12. Fixed clamp, 13. Limiting post, 14. Moving clamp, 15. Connecting post, 16. Clamping ring, 17. Mounting base, 18. Clamping hydraulic cylinder, 19. Semi-arc clamping block, 20. Control panel, 21. First guide rod, 22. Second guide rod. Detailed Implementation

[0021] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] Example: Those skilled in the art shall connect all electrical components and their compatible power supplies in this case with wires, and select appropriate controllers according to actual conditions to meet control requirements. The specific connection and control sequence shall refer to the working principle described below, in which the electrical components are connected in sequence. The detailed connection methods are well-known in the art. The following mainly introduces the working principle and process, without explaining the electrical control.

[0023] Please see Figure 1-4 To address the problems of traditional testing methods being cumbersome and requiring frequent changes of fixtures and equipment, which not only increases testing costs but also reduces testing efficiency, and the fact that nuts can typically move radially within the fixture during testing, easily leading to radial runout or skewness, further affecting testing accuracy, this technical solution is designed. The detailed technical solution is as follows:

[0024] A high-strength nut load limit assessment device includes a base 1, a plurality of supports 2 on the base 1, a support top 3 at one end of each support 2, a test hydraulic cylinder 4 fixedly inserted on the support top 3, a tension / compression sensor 5 installed on the telescopic end of the test hydraulic cylinder 4, a fixed clamp on the base 1, a movable clamp on the tension / compression sensor 5, a fixed pull cup on the fixed clamp, a movable pull cup on the movable clamp, and a placement structure movably provided on the fixed pull cup and the movable pull cup.

[0025] It should be noted that the device is installed at the target position via base 1, the device is connected to the power supply, and the hydraulic components mentioned in the device are connected to the hydraulic power system.

[0026] Specifically, the placement structure includes a large-end threaded post 6, a guide slot hole is opened at the center of one end of the large-end threaded post 6, a tension ring 7 is threadedly fitted on the large-end threaded post 6, a semi-threaded support rod 8 is provided at the center of the other end of the large-end threaded post 6, a washer 9 is movably fitted on the semi-threaded support rod 8, a tension nut 10 is threadedly fitted on the semi-threaded support rod 8 near the washer 9, and a pressure nut 11 is threadedly fitted on one end of the semi-threaded support rod 8.

[0027] It should be noted that when assembling and placing the structure, first, the tension ring 7 is threaded onto the large end threaded post 6, and then the washer 9 is threaded onto the semi-threaded support rod 8. The semi-threaded support rod 8 is that the end near the large end threaded post 6 is unthreaded, while the end away from the large end threaded post 6 is threaded. The tension nut 10 is threaded onto the body of the semi-threaded support rod 8, and the pressure nut 11 is threaded onto one end of the semi-threaded support rod 8, that is, half of the pressure nut 11 is screwed onto the end of the semi-threaded support rod 8, and the rest of the pressure nut 11 is suspended.

[0028] Specifically, the fixed pull bowl includes a fixed clip head 12, which has a stepped notch. The tension ring 7 is movably placed inside the stepped notch. A limit post 13 is installed on the bottom surface of the inner side of the stepped notch, and the limit post 13 matches the guide groove.

[0029] Specifically, the movable pull bowl includes a movable clamp 14, which has an opening for receiving. The gasket 9, the pull-test nut 10, and the pressure-test nut 11 are movably placed inside the stepped opening.

[0030] It should be noted that the staff first adjusts the extension and retraction of the test hydraulic cylinder 4 so that the stepped notch and the receiving notch are aligned with the two ends of the placement structure. The placement structure is then moved laterally so that it is placed in the stepped notch and the receiving notch. The large end threaded column 6 is then fitted onto the limiting column 13 through the guide slot to prevent the placement structure from moving radially or tilting during the fixed pull cup and the moving pull cup.

[0031] First, a pressure test is performed on the pressure test nut 11. The test hydraulic cylinder 4 extends, pushing the movable clamp closer to the fixed clamp. The movable pull cup applies pressure to the suspended end of the pressure test nut 11. The tension and compression sensor 5 monitors the pressure value. When the pressure reaches the preset limit value or the pressure value detected by the tension and compression sensor 5 suddenly drops, the test hydraulic cylinder 4 stops extending, and the test ends.

[0032] Then, a pull test is performed on the pull test nut 10. The test hydraulic cylinder 4 retracts, moving the movable clamp away from the fixed clamp and applying an axial tensile force to the pull test nut 10. The tension sensor 5 monitors the tensile force value. When the tensile force reaches the preset limit value or the tensile force value detected by the tension sensor 5 suddenly drops, the test hydraulic cylinder 4 stops retracting, and the test ends.

[0033] The tooling only needs to be assembled once, and only one device is needed to perform the nut compression and pull-out tests, eliminating the cumbersome steps of changing fixtures and equipment in the traditional method, improving the testing efficiency. At the same time, the design of the limiting post 13 and the guide slot hole ensures that the placement structure does not move radially or tilt during the test, thus improving the testing accuracy.

[0034] Specifically, both the fixed clamp head 12 and the movable clamp head 14 are provided with connecting posts 15, and multiple retaining rings 16 are provided on the connecting posts 15 along the axial direction;

[0035] Specifically, both the fixed clamp and the movable clamp include a mounting base 17. The mounting base 17 has a placement groove in the center. Two clamping hydraulic cylinders 18 are symmetrically inserted into the inner wall of the placement groove. Each clamping hydraulic cylinder 18 has a semi-arc clamping block 19 installed at its telescopic end. The semi-arc clamping block 19 has a slot that matches multiple retaining rings 16.

[0036] It should be noted that the connecting post 15 on the fixed pull bowl is inserted into the placement slot of the fixed clamp, and the connecting post 15 on the movable pull bowl is inserted into the placement slot of the movable clamp. The clamping hydraulic cylinder 18 extends to its limit position and pushes the slots of the two semi-circular clamping blocks 19 to engage with the retaining rings 16 on the connecting post 15 to fix the connecting post 15.

[0037] As a preferred and further option, a control panel 20 is installed on the base 1. The control panel 20 usually has a built-in microcontroller. The microcontroller can be programmed with software. By writing the control program, the device can be controlled. Since this is existing technology, it will not be described in detail here.

[0038] As a preferred and further option, a first guide rod 21 is movably inserted on the top of the frame 3. One end of the first guide rod 21 is installed on the movable clamp. The first guide rod 21 is used to support and limit the movable clamp and protect the telescopic end of the test hydraulic cylinder 4.

[0039] As a preferred and further option, a second guide rod 22 is installed on the semi-circular clamping block 19. One end of the second guide rod 22 is movably inserted into the mounting base 17. The second guide rod 22 is used to support and limit the semi-circular clamping block 19 and protect the telescopic end of the clamping hydraulic cylinder 18.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-strength nut load limit assessment device, comprising a base (1), wherein a plurality of supports (2) are provided on the base (1), and a frame top (3) is provided at one end of the plurality of supports (2), and a test hydraulic cylinder (4) is fixedly inserted on the frame top (3), characterized in that, The telescopic end of the test hydraulic cylinder (4) is equipped with a tension and compression sensor (5), a fixed clamp is provided on the base (1), a movable clamp is provided on the tension and compression sensor (5), a fixed pull bowl is provided on the fixed clamp, a movable pull bowl is provided on the movable clamp, and a placement structure is movably provided on the fixed pull bowl and the movable pull bowl. The placement structure includes a large-end threaded post (6), a guide slot is provided at the center of one end of the large-end threaded post (6), a tension ring (7) is threaded onto the large-end threaded post (6), a semi-threaded support rod (8) is provided at the center of the other end of the large-end threaded post (6), a washer (9) is movably fitted onto the semi-threaded support rod (8), a pull-test nut (10) is threaded onto the semi-threaded support rod (8) near the washer (9), and a pressure-test nut (11) is threaded onto one end of the semi-threaded support rod (8). The fixed pull bowl includes a fixed clip (12), the clip has a stepped notch, the pull ring (7) is movably placed inside the stepped notch, and a limit post (13) is installed on the bottom surface of the inner side of the stepped notch. The limit post (13) matches the guide slot. The movable pull bowl includes a movable clamp (14), which has an opening for receiving. The gasket (9), the pull nut (10), and the pressure nut (11) are movably placed inside the stepped opening.

2. The high strength nut load limit evaluation device of claim 1, wherein, Both the fixed clamp (12) and the movable clamp (14) are provided with connecting posts (15), and multiple retaining rings (16) are provided on the connecting posts (15) along the axial direction.

3. The high strength nut load limit evaluation device of claim 2, wherein, Both the fixed clamp and the movable clamp include a mounting base (17). The mounting base (17) has a placement groove in the center. Two clamping hydraulic cylinders (18) are symmetrically inserted into the inner wall of the placement groove. Each clamping hydraulic cylinder (18) has a semi-arc clamping block (19) installed at its telescopic end. The semi-arc clamping block (19) has a slot that matches the multiple retaining rings (16).

4. The high strength nut load limit evaluation device of claim 1, wherein, A control panel (20) is installed on the base (1).

5. The high strength nut load limit evaluation device of claim 1, wherein, A first guide rod (21) is movably inserted on the top (3) of the frame, and one end of the first guide rod (21) is installed on the movable clamp.

6. The high strength nut load limit evaluation device of claim 3, wherein A second guide rod (22) is installed on the semi-circular clamp (19), and one end of the second guide rod (22) is movably inserted into the mounting base (17).

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