Tool for testing friction coefficient of threaded fastener

Abstract

The utility model relates to the technical field of friction coefficient testing of threaded fasteners, and discloses a tool for testing the friction coefficient of a threaded fastener, which comprises a working table, a bolt fixing part and a nut fixing part, an operation table is arranged on one side of the working table, and a power supply box is arranged at the bottom of the working table. A motor is fixedly installed at the top of the workbench, and a sliding groove is formed in the outer wall of the top of the workbench. According to the utility model, through the cooperation among the torsion sensor, the rectangular fixing block, the bolt fixing cylinder, the rectangular groove and the bolt fixing groove, the bolt can be firmly fixed, the position of the bolt is ensured to be stable and the bolt cannot shake or shift in the test process, the test precision is improved, and the test efficiency is improved. According to the invention, the accuracy of the test result is ensured, the bolt can be quickly and conveniently mounted and dismounted, the test efficiency is improved, the fixing state of the bolt every time is ensured to be basically consistent, and repeatable test data can be obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of friction coefficient testing of threaded fasteners, in particular to a tooling for testing the friction coefficient of threaded fasteners. Background Technique

[0002] Threaded fasteners are widely used in various mechanical mechanisms because of their easy disassembly and repair. They are one of the most widely used connection methods. The magnitude and stability of the pre-tightening force generated during the tightening process will directly determine the safety and reliability of the threaded connection. In most engineering applications, the pre-tightening force of the fastener is achieved by applying a tightening torque to the screw, bolt head or nut with a torque wrench.

[0003] Accurately testing the friction of threaded fasteners is of great significance for improving the reliability and safety of threaded connections. Most of the current devices for testing the friction coefficient of threads are based on test elements and power elements such as pressure sensors, rotational torque sensors, angle encoders, and DC motors. When testing fasteners, it is necessary to replace the tooling multiple times according to bolts and nuts of different sizes, which may affect the test accuracy and precision to a certain extent and it is difficult to ensure the complete consistency of each test condition. Content of the Utility Model

[0004] The purpose of the utility model is to provide a tooling for testing the friction coefficient of threaded fasteners to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A tooling for testing the friction coefficient of threaded fasteners, including a workbench, a bolt fixing part, and a nut fixing part. An operating table is arranged on the workbench, a power supply box is arranged at the bottom of the workbench, a motor is fixedly installed on the top of the workbench, and a chute is opened on the outer wall of the top of the workbench; both the bolt fixing part and the nut fixing part are arranged on the top of the workbench.

[0006] Preferably, the bolt fixing part specifically includes: a torque sensor fixedly installed on the top of the workbench; a rectangular fixing block is fixedly installed at the output end of the torque sensor, and the input end of the torque sensor is fixedly connected to the output end of the motor. The rectangular fixing block is snap-connected with a bolt fixing cylinder. The four right-angled sides of the rectangular fixing block provide good stability and support force, and can ensure stability when fixing an object.

[0007] Preferably, one end of the bolt fixing cylinder is provided with a rectangular groove, and the other end of the bolt fixing cylinder is provided with a bolt fixing groove, and the rectangular groove is adapted to the rectangular fixing block.

[0008] Preferably, the nut fixing part specifically includes: a fixing block fixedly installed on the top of the workbench; an electric telescopic rod is fixedly installed on one side of the fixing block, the telescopic end of the electric telescopic rod is fixedly connected with a slider, a cavity is formed in the slider, a connecting block is fixedly installed on the inner wall of the cavity, one end of the connecting block away from the inner wall of the cavity is fixedly connected with a pressure sensor, and the slider is slidably connected with a chute.

[0009] Preferably, a pressure rod is fixedly connected to the pressure sensor, one end of the pressure rod away from the pressure sensor movably penetrates the outer wall of the slider, and is fixedly connected with a spring, one end of the spring away from the pressure rod is fixedly connected with a cushion block, and the slider is respectively installed with support seat positioning columns and nut fixing block positioning columns at equal circumferential intervals. The settings of the support seat positioning columns and nut fixing block positioning columns ensure that the installation position of the support seat is accurate, guarantee good cooperation with other components, can be installed quickly and accurately, and improve the assembly efficiency.

[0010] Preferably, a nut fixing block is sleeved on the nut fixing block positioning column, a support seat is sleeved on the support seat positioning column, and the support seat is respectively provided with a threaded hole, a through hole, a placement groove and a positioning hole.

[0011] Preferably, a bolt is threadedly connected to the threaded hole, a gasket is placed in the placement groove, and the positioning hole is adapted to the support seat positioning column.

[0012] Preferably, a fixing threaded hole is formed in the slider, the fixing threaded hole is adapted to the bolt, and a nut groove is formed in the nut fixing block.

[0013] The utility model provides a tooling for testing the friction coefficient of threaded fasteners. It has the following beneficial effects:

[0014] (1) Through the cooperation between the torque sensor, the rectangular fixing block, the bolt fixing cylinder, the rectangular groove and the bolt fixing groove, the utility model can firmly fix the bolt, ensure the stable position of the bolt during the test, without shaking or displacement, guarantee the accuracy of the test results, can install and disassemble the bolt quickly and conveniently, improve the test efficiency, ensure that the fixing state of the bolt is basically the same each time, and is conducive to obtaining repeatable test data.

[0015] (2) Through the cooperation between the bolt, the gasket, the support seat, the nut fixing block, the support seat positioning column, the cushion block, the nut fixing block positioning column, the electric telescopic rod, the fixing block, the pressure rod, the pressure sensor, the connecting block and the slider, the utility model can accurately fix the position of the nut, ensure the stable state of the nut during the test, guarantee the accuracy of the test data, can adapt to nuts of different specifications and sizes, has strong versatility, is convenient for quickly installing and fixing the nut, saves the test preparation time, ensures that the fixing state of the nut is similar each time, and is convenient for obtaining repeatable test results. Brief Description of the Drawings

[0016] Figure 1 This is a perspective view of the present utility model;

[0017] Figure 2 This is a partial view of the bolt fixing part of the present utility model;

[0018] Figure 3 This is a partial view of the nut fixing part of the present utility model;

[0019] Figure 4 This is a partial sectional view of the nut fixing part of the present utility model.

[0020] In the figure: 1 workbench, 2 power supply box, 3 operation console, 4 motor, 5 bolt fixing part, 511 torque sensor, 512 rectangular fixing block, 513 bolt fixing cylinder, 514 rectangular groove, 515 bolt fixing groove, 6 nut fixing part, 611 bolt, 612 gasket, 613 support seat, 614 nut fixing block, 615 support seat positioning post, 616 spacer block, 617 nut fixing block positioning post, 618 electric telescopic rod, 619 fixing block, 6111 pressure rod, 6112 pressure sensor, 6113 connecting block, 6114 slider. Detailed Description of the Preferred Embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation of the present utility model.

[0023] Embodiment 1

[0024] A preferred embodiment of a tooling for testing the friction coefficient of a threaded fastener provided by the present utility model is as Figures 1-4 shown: A tooling for testing the friction coefficient of a threaded fastener includes a workbench 1, a bolt fixing part 5, and a nut fixing part 6. An operation console 3 is arranged on the workbench 1, a power supply box 2 is arranged at the bottom of the workbench 1, a motor 4 is fixedly installed on the top of the workbench 1, and a chute is provided on the outer wall of the top of the workbench 1; both the bolt fixing part 5 and the nut fixing part 6 are arranged on the top of the workbench 1.

[0025] The bolt fixing part 5 specifically includes:

[0026] A torque sensor 511, fixedly installed on the top of the workbench 1;

[0027] A rectangular fixing block 512 is fixedly installed at the output end of the torque sensor 511, and the input end of the torque sensor 511 is fixedly connected to the output end of the motor 4. The rectangular fixing block 512 is snap-connected to a bolt fixing cylinder 513.

[0028] One end of the bolt fixing cylinder 513 is provided with a rectangular groove 514, and the other end of the bolt fixing cylinder 513 is provided with a bolt fixing groove 515. The rectangular groove 514 is adapted to the rectangular fixing block 512.

[0029] During the process of this embodiment, first, select a bolt fixing cylinder 513 that is adapted to the rectangular fixing block 512 according to the model of the test bolt. Secondly, open the power supply box 2, and then adjust the data of the torque sensor 511 to zero through the operation table 3.

[0030] Embodiment 2

[0031] On the basis of Embodiment 1, a preferred embodiment of a tooling for testing the friction coefficient of a threaded fastener provided by the present utility model is as Figures 1-4 shown: The nut fixing part 6 specifically includes:

[0032] A fixing block 619, fixedly installed on the top of the workbench 1;

[0033] A cavity is provided in the slider 6114, and a connecting block (6113) is fixedly installed on the inner wall of the cavity. One end of the connecting block 6113 away from the inner wall of the cavity is fixedly connected to a pressure sensor 6112, and the other end of the connecting block 6113 is fixedly connected to a pressure sensor 6112. The slider 6114 is slidably connected to the chute.

[0034] A pressure rod 6111 is fixedly connected to the pressure sensor 6112. One end of the pressure rod (6111) away from the pressure sensor 6112 movably penetrates through the outer wall of the slider 6114 and is fixedly connected to a spring. One end of the spring away from the pressure rod 6111 is fixedly connected to a cushion block 616. Support seat positioning columns 615 and nut fixing block positioning columns 617 are respectively installed on the slider 6114 at equal circumferential intervals.

[0035] A nut fixing block 614 is sleeved on the nut fixing block positioning column 617, and a support seat 613 is sleeved on the support seat positioning column 615. Threaded holes, through holes, placing grooves and positioning holes are respectively provided on the support seat 613.

[0036] A bolt 611 is threadedly connected to the threaded hole, a gasket 612 is placed in the placing groove, and the positioning hole is adapted to the support seat positioning column 615.

[0037] The slider 6114 is provided with fixed threaded holes which are adapted to the bolts 611, and the nut fixing block 614 is provided with nut grooves.

[0038] In the process of this embodiment, first manually unscrew the bolt 611, then remove the support seat 613 and the nut fixing block 614, and place the nut in the nut fixing groove provided in the nut fixing block 614. Then sleeved the nut fixing block 614 on the nut fixing block positioning post 617, then sleeved the support seat 613 on the support seat positioning post 615, then adjust the positions of the holes and the through holes on the gasket 612 according to different types of test bolts. Finally, fix the support seat 613 and the slider 6114 tightly by the bolt 611. Then rotatably connect the test bolt with the nut through the gasket 612 and the support seat 613. Finally, start the electric telescopic rod 618 through the operating platform 3, move the slider 6114 to a suitable position, make the other end of the bolt 611 engage with the bolt fixing cylinder 513, and then start the motor 4 through the operating platform 3. During the test, the torque sensor 511 and the pressure sensor 6112 transmit the data to the operating platform 3 through electrical signals.

[0039] Working principle: First, select a bolt fixing cylinder 513 that is adapted to the test bolt and engage it with the rectangular fixing block 512. Secondly, turn on the power supply box 2, and then adjust the data of the torque sensor 511 to zero through the operating platform 3. First, manually unscrew the bolt 611, then remove the support seat 613 and the nut fixing block 614, and place the nut in the nut fixing groove provided in the nut fixing block 614. Then sleeved the nut fixing block 614 on the nut fixing block positioning post 617, then sleeved the support seat 613 on the support seat positioning post 615, then adjust the positions of the holes and the through holes on the gasket 612 according to different types of test bolts. Finally, fix the support seat 613 and the slider 6114 tightly by the bolt 611. Then rotatably connect the test bolt with the nut through the gasket 612 and the support seat 613. Finally, start the electric telescopic rod 618 through the operating platform 3, move the slider 6114 to a suitable position, make the other end of the bolt 611 engage with the bolt fixing cylinder 513, and then start the motor 4 through the operating platform 3. During the test, the torque sensor 511 and the pressure sensor 6112 transmit the data to the operating platform 3 through electrical signals.

[0040] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0041] Finally, it should be noted that the above are only preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent substitution on some of the technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A tool for testing the friction coefficient of a threaded fastener, comprising a workbench (1), a bolt fixing portion (5), and a nut fixing portion (6), characterized in that: An operating table (3) is arranged on the workbench (1), a power supply box (2) is arranged at the bottom of the workbench (1), a motor (4) is fixedly mounted on the top of the workbench (1), and a slide groove is provided on the top outer wall of the workbench (1); the bolt fixing portion (5) and the nut fixing portion (6) are both arranged on the top of the workbench (1).

2. A tool for testing the friction coefficient of threaded fasteners according to claim 1, characterized in that: The bolt fixing portion (5) specifically comprises: A torque sensor (511) is fixedly mounted on the top of the workbench (1); The output end of the torque sensor (511) is fixedly mounted with a rectangular fixing block (512), and the input end of the torque sensor (511) is fixedly connected to the output end of the motor (4), and the rectangular fixing block (512) is snap-connected with a bolt fixing cylinder (513).

3. A tool for testing the friction coefficient of threaded fasteners according to claim 2, characterized in that: A rectangular groove (514) is formed at one end of the bolt fixing tube (513), and a bolt fixing groove (515) is formed at the other end of the bolt fixing tube (513), wherein the rectangular groove (514) is adapted to fit the rectangular fixing block (512).

4. A tool for testing the friction coefficient of threaded fasteners according to claim 1, characterized in that: The nut fixing portion (6) specifically comprises: A fixed block (619) fixedly mounted on the top of the workbench (1); An electric telescopic rod (618) is fixedly mounted on the outer wall of the fixed block (619); a sliding block (6114) is fixedly connected to the telescopic end of the electric telescopic rod (618); a cavity is formed on the sliding block (6114); a connecting block (6113) is fixedly mounted on the inner wall of the cavity; a pressure sensor (6112) is fixedly connected to one end of the connecting block (6113) away from the inner wall of the cavity; and the sliding block (6114) is slidably connected to the sliding groove.

5. A tool for testing the friction coefficient of threaded fasteners according to claim 4, characterized in that: The pressure sensor (6112) is fixedly connected to a pressure rod (6111), one end of the pressure rod (6111) away from the pressure sensor (6112) movably penetrates the outer wall of the slider (6114) and is fixedly connected to a spring, one end of the spring away from the pressure rod (6111) is fixedly connected to a cushion block (616), and the slider (6114) is equidistantly mounted with support seat positioning columns (615) and nut fixing block positioning columns (617) at a circumferential distance.

6. A tool for testing the friction coefficient of threaded fasteners according to claim 5, characterized in that: The nut fixing block positioning column (617) is sleeved with a nut fixing block (614), the support seat positioning column (615) is sleeved with a support seat (613), and the support seat (613) is respectively provided with a threaded hole, a through hole, a placement groove and a positioning hole.

7. A tool for testing the friction coefficient of threaded fasteners according to claim 6, characterized in that: The threaded hole is threadedly connected with a bolt (611), the placement groove is placed with a gasket (612), and the positioning hole is compatible with the support seat positioning column (615).

8. A tool for testing the friction coefficient of threaded fasteners according to claim 7, characterized in that: The sliding block (6114) is provided with a fixing threaded hole, the fixing threaded hole being compatible with the bolt (611), and the nut fixing block (614) is provided with a nut groove.

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