Steel ball clamping device suitable for friction-wear testing machine

Abstract

The utility model provides a steel ball clamping device suitable for a friction-wear testing machine, which comprises a clamping head used for being connected with the friction-wear testing machine, a steel ball base arranged at the lower end of the clamping head, a plurality of spherical grooves arranged at the bottom of the steel ball base, steel balls placed in the spherical grooves, and a bottom cover arranged below the steel ball base. A limiting spherical groove matched with the steel ball is formed in the bottom cover, a through hole for exposing the steel ball is formed in the bottom of the limiting spherical groove, threaded holes matched with the fastening screw are formed in the steel ball base and the bottom cover, and the steel ball base and the bottom cover are connected through the fastening screw. The device can conveniently, quickly and stably clamp the steel ball, and meets the test requirement of the steel ball friction pair for stability.

Description

Technical Field

[0001] The utility model relates to the technical field of material friction and wear, in particular to a steel ball clamping device suitable for a friction and wear testing machine. Background Art

[0002] In tribology tests, friction and wear testing machines are usually used to detect the friction and wear properties of the test materials, and most friction and wear tests use steel ball friction pairs. The test requires that the steel balls be firmly clamped without left and right jumping or circular rolling, to ensure that a stable friction surface is formed between the test material and the steel ball to ensure the success rate of the friction and wear test.

[0003] However, the existing steel ball clamping devices or fixtures are inconvenient to operate or can only clamp a single steel ball. For example, a variable working condition dynamic loading material lubrication friction and wear testing machine disclosed in CN220568595U can only clamp a single steel ball, thereby affecting the efficiency of friction and wear and the convenience of operation. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a steel ball clamping device suitable for a friction and wear testing machine, which can clamp the steel ball conveniently, quickly and stably, and meet the test requirements of the steel ball friction pair for stability.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a steel ball clamping device suitable for a friction and wear testing machine, including a clamping head for connecting to the friction testing machine, a steel ball base is provided at the lower end of the clamping head, a plurality of spherical grooves are provided at the bottom of the steel ball base, the steel balls are placed in the spherical grooves, a bottom cover is provided under the steel ball base, a limiting spherical groove adapted to the steel ball is provided on the bottom cover, a through hole is provided at the bottom of the limiting spherical groove for exposing the steel ball, threaded holes matching with fastening screws are provided on the steel ball base and the bottom cover, and the steel ball base and the bottom cover are connected by the fastening screws.

[0006] In a preferred solution, a connecting thread groove is provided on the upper end of the clamping head, and the head of the friction testing machine is connected to the connecting thread groove.

[0007] In a preferred solution, a positioning rod is provided on the upper side of the bottom cover, and a positioning hole matching with the positioning rod is provided on the steel ball base.

[0008] In a preferred solution, the fastening screws include a central fastening screw and a plurality of circumferential fastening screws, the central fastening screw is arranged at the center of the bottom cover, and the circumferential fastening screws are distributed along the same pitch circle.

[0009] The utility model provides a steel ball clamping device suitable for a friction and wear testing machine, which has the following beneficial effects:

[0010] 1. The steel ball clamping device has a simple structure, easy installation and simple operation. The steel ball can be clamped and fixed by tightening the fastening screws between the steel ball base and the bottom cover. Similarly, when taking out the steel ball, it is only necessary to manually rotate the fastening screws. The steel ball clamped between the steel ball base and the bottom cover will not jump left and right or roll in a circle, so as to ensure the stability of the contact surface of the friction pair and greatly improve the success rate of the friction and wear test.

[0011] 2. Multiple steel balls can be clamped to improve the efficiency of friction and wear.

[0012] 3. The device has a simple structure, compact dimensions, and is easy to operate and install, meeting the requirements for the installation and use of friction and wear testing machines. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the connection structure between the chuck and the steel ball base;

[0016] Figure 3 It is a structural schematic diagram of the connection structure between the chuck and the steel ball base from another angle;

[0017] Figure 4 is a schematic diagram of the structure of the bottom cover;

[0018] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present device;

[0019] In the figure: chuck 1, steel ball base 2, spherical groove 3, steel ball 4, bottom cover 5, limiting spherical groove 6, through hole 7, fastening screw 8, threaded hole 9, connecting threaded groove 10, positioning rod 11, positioning hole 12, center fastening screw 801, circumferential fastening screw 802. DETAILED DESCRIPTION

[0020] Example 1: Figures 1 to 4 As shown, a steel ball clamping device suitable for a friction and wear testing machine includes a clamping head 1 for connecting to the friction testing machine. The clamping head 1 is a cylindrical structure. The clamping head 1 can be connected to the head of the friction testing machine through a coupling. In this embodiment, a connecting thread groove 10 is provided on the upper end of the clamping head 1, and the head of the friction testing machine is connected to the connecting thread groove 10, which is convenient for disassembly, cleaning and replacement of the clamping head 1.

[0021] A steel ball base 2 is provided at the lower end of the chuck 1, and the steel ball base 2 is fixedly connected to the chuck 1. The steel ball base 2 is a disc structure, and a plurality of spherical grooves 3 are provided at the bottom of the steel ball base 2. Steel balls 4 are placed in the spherical grooves 3. A bottom cover 5 is provided below the steel ball base 2, and a limiting spherical groove 6 adapted to the steel ball 4 is provided on the bottom cover 5. A through hole 7 for exposing the steel ball 4 is provided at the bottom of the limiting spherical groove 6. The diameter of the steel ball 4 is larger than the depth of the spherical groove 3, so that after the bottom cover 5 is installed below the steel ball base 2, the steel ball 4 can be exposed from the through hole 7 for friction and wear.

[0022] The steel ball base 2 and the bottom cover 5 are both provided with threaded holes 9 that cooperate with the fastening screws 8. The fastening screws 8 are countersunk screws. The steel ball base 2 and the bottom cover 5 are connected by the fastening screws 8. By connecting the steel ball base 2 and the bottom cover 5, the steel ball 4 is clamped and limited. The spherical groove 3 and the limiting spherical groove 6 increase the contact area with the steel ball 4, so that the steel ball 4 can rotate but cannot jump left and right or roll in a circle. The steel ball can be clamped conveniently, quickly and stably, meeting the test requirements of the steel ball friction pair for stability.

[0023] In this embodiment, the fastening screws 8 include a central fastening screw 801 and a plurality of circumferential fastening screws 802 . The central fastening screw 801 is arranged at the center of the bottom cover 5 , and the circumferential fastening screws 802 are distributed along the same pitch circle.

[0024] During disassembly and assembly, the tightening screws 8 need to be tightened from the center to the periphery in multiple times to ensure that the steel ball base 2 and the bottom cover 5 are parallel and without warping, so as to ensure the stability of the clamping force during the test.

[0025] The working principle of this device is as follows:

[0026] When in use, first place the device upside down with the spherical groove 3 of the steel ball base 2 facing upward, place the steel ball 4 in the spherical groove 3 of the steel ball base 2, then connect the bottom cover 5 and the steel ball base 2 with the fastening screws 8, tighten the fastening screws 8 to clamp the steel ball 4, and then connect the chuck 1 to the motor spindle of the friction and wear testing machine to carry out the friction and wear test.

[0027] Embodiment 2: Different from embodiment 1, as Figure 5 As shown, a positioning rod 11 is provided on the upper side of the bottom cover 5 , and a positioning hole 12 matching with the positioning rod 11 is provided on the steel ball base 2 .

[0028] When the bottom cover 5 and the steel ball base 2 are closed, the bottom cover 5 is positioned by inserting the positioning rod 11 on the upper side of the bottom cover 5 into the positioning hole 12 of the steel ball base 2, so as to facilitate the alignment of the threaded holes 9 on the steel ball base 2 and the bottom cover 5, so that the spherical groove 3 and the limiting spherical groove 6 are correspondingly arranged, and the steel ball 4 is limited and fixed, which is convenient for installation.

Claims

1. A steel ball clamping device suitable for a friction and wear testing machine, It is characterized in that The invention comprises a chuck (1) for connecting to a friction testing machine, wherein a steel ball base (2) is provided at the lower end of the chuck (1), a plurality of spherical grooves (3) are provided at the bottom of the steel ball base (2), a steel ball (4) is placed in the spherical grooves (3), a bottom cover (5) is provided below the steel ball base (2), a limiting spherical groove (6) matched with the steel ball (4) is provided on the bottom cover (5), a through hole (7) for exposing the steel ball (4) is provided at the bottom of the limiting spherical groove (6), a threaded hole (9) matched with a fastening screw (8) is provided on the steel ball base (2) and the bottom cover (5), and the steel ball base (2) and the bottom cover (5) are connected by the fastening screw (8).

2. A steel ball clamping device suitable for a friction and wear testing machine according to claim 1, It is characterized in that The upper end of the chuck head (1) is provided with a connecting thread groove (10), and the head of the friction testing machine is connected to the connecting thread groove (10).

3. A steel ball clamping device suitable for a friction and wear testing machine according to claim 1, It is characterized in that A positioning rod (11) is provided on the upper side of the bottom cover (5), and a positioning hole (12) matching with the positioning rod (11) is provided on the steel ball base (2).

4. A steel ball clamping device suitable for a friction and wear testing machine according to claim 1, It is characterized in that The fastening screws (8) comprise a central fastening screw (801) and a plurality of circumferential fastening screws (802); the central fastening screw (801) is arranged at the center of the bottom cover (5), and the circumferential fastening screws (802) are distributed along the same pitch circle.

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