Vertical end face contact friction wear testing machine

Abstract

The utility model discloses a vertical end face contact friction wear testing machine, which belongs to the technical field of tribology research and experimental test, and comprises a base and a mounting rack fixed on the base, the upper end part of the mounting rack is provided with an upper mounting seat, the lower end part of the mounting rack is provided with a lower mounting seat, and the lower mounting seat is fixedly connected with the base. A loading mechanism and a measuring structure are mounted in the mounting frame, the loading mechanism comprises a nut follow-up block, a plurality of through holes are formed in the nut follow-up block, a guide rail, a ball screw and the measuring structure are mounted in the through holes respectively, and the top of the ball screw is connected with a servo motor. The vertical end face contact friction wear testing machine disclosed by the utility model can ensure that the load between samples reaches a preset value and is stable, so that the load control is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of tribology research and experimental testing, in particular to a vertical end face contact friction and wear testing machine. Background Art

[0002] There will always be friction and wear between the relative moving parts of mechanical equipment, and friction and wear are not only the cause of low efficiency of mechanical equipment, but also the main form of equipment failure. Therefore, it is very important to study the friction and wear mechanism and the tribological properties of materials. The friction and wear performance indicators of materials are mainly tested by friction and wear testing machines, so friction and wear testing machines have become an indispensable experimental equipment for tribological test research.

[0003] According to the distribution of moving test pieces, friction and wear testing machines can be divided into vertical friction and wear testing machines and horizontal friction and wear testing machines. Regardless of the form of friction and wear testing machine, a loading device is required to provide loading pressure for the test piece.

[0004] The loading device in the prior art is generally provided with a spring mechanism, such as the heavy-load multi-sensing friction and wear testing machine of Chinese patent CN 117451558 A, which drives the thrust plate to move up and down through a spring buffer mechanism. The thrust plate pushes the processing axis upward, and the load is loaded upward through a linear bearing fixed on the desktop, and the linear bearing drives the sample fixture up and down to contact the upper rotating mechanism. In the above design, since the spring will generate a certain buffer force in the process of pushing the thrust plate, and long-term use will cause problems such as spring aging, the force of the pressure sensor is unstable, which leads to the instability of the load value of the loading system. Utility Model Content

[0005] The technical problem to be solved by the utility model is to design a novel vertical end face contact friction and wear testing machine, the loading system of which can ensure that the load between the test specimens reaches a preset value and is stable, thereby realizing load control.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions: a vertical end face contact friction and wear testing machine, including a base, a mounting frame fixed on the base, an upper mounting frame is provided at the upper end of the mounting frame, and a lower mounting frame is provided at the lower end, the lower mounting frame is fixedly connected to the base, a loading mechanism and a measuring structure are installed inside the mounting frame, the loading mechanism includes a nut follower block, a plurality of through holes are provided on the nut follower block, guide rails, ball screws and measuring structures are respectively installed in the through holes, and the top of the ball screw is connected to the servo motor.

[0007] Furthermore, the ball screw includes a support seat fixed on the lower mounting seat, the upper portion of the support seat is threadedly connected to a screw rod, and the top of the screw rod is connected to a servo motor via a coupling.

[0008] Furthermore, support seats are respectively arranged at both ends of the guide rail and are fixedly connected to the upper mounting seat and the lower mounting seat, and the track of the guide rail is an optical axis structure.

[0009] Furthermore, the measuring structure includes a pressure sensor module.

[0010] Preferably, the pressure sensor module comprises a force transmission member and a sensor placement box located at the lower part of the force transmission member, the force transmission member is connected to the nut follower block, and the pressure sensor is placed in the sensor placement box.

[0011] Furthermore, the pressure sensor module and the servo motor are respectively connected to the input end and the output end of the loading controller.

[0012] Furthermore, the lower end of the pressure sensor module is fixedly connected to the torque sensor module, and the output end of the torque sensor module is connected to the data acquisition system.

[0013] Furthermore, the measuring structure comprises a sample fixture module, the upper part of the sample fixture module is connected to the torque sensor module via a flange and a universal joint, and the lower part of the sample fixture module is connected to the motor via a planetary reducer.

[0014] Furthermore, the sample fixture module includes two sample fixtures which are symmetrically arranged up and down.

[0015] Further, the sample fixture comprises a fixture cavity, a fixture cavity locking bolt is arranged on one side of the fixture cavity, a rotating shaft is arranged on one end surface of the fixture cavity, and a transmission shaft locking bolt is arranged at the connection between the rotating shaft and the fixture cavity.

[0016] Beneficial effects: The loading system of the vertical end face contact friction and wear testing machine of the present application controls the servo motor to drive the ball screw to move in a closed-loop control manner to generate a load between the upper and lower specimens. The load size is controlled by the pressure sensor module and then fed back to the loading controller. The loading controller will detect the data detected on the pressure sensor module in real time, and send a control signal to control the servo motor to make adjustments. The load control is achieved through a closed-loop control system, which ensures that the load size between the specimens reaches the preset value and is stable, thereby achieving load control.

[0017] At the same time, the testing machine installs a universal joint at the upper end of the upper sample fixture so that the upper sample can fine-tune its angle in real time during friction, ensuring that the adaptive coupling of the two disc sample end faces is completely in fit and uniformly stressed when the upper and lower samples rotate and rub against each other, thereby ensuring stable friction between the samples.

[0018] In summary, this testing machine is smartly designed and can be used to conduct dry friction and lubricated friction tests on the upper and lower sample end faces, and to preliminarily detect the friction and wear characteristics of the samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the friction and wear testing machine of the utility model.

[0020] Figure 2 It is a structural schematic diagram of the nut follower block of the utility model.

[0021] Figure 3 This is a schematic diagram of the structure of the pressure sensor module of the utility model.

[0022] Figure 4 It is a structural schematic diagram of the measuring mechanism of the utility model.

[0023] Figure 5 It is a structural schematic diagram of the sample clamp of the utility model.

[0024] Among them, 1-base, 2-mounting frame, 3-upper mounting seat, 4-lower mounting seat, 5-nut follower block, 6-guide rail, 7-ball screw, 8-servo motor, 9-pressure sensor module, 91-force transmission component, 92-sensor placement box, 10-torque sensor module, 11-flange, 12-universal joint, 13-sample fixture module, 131-fixture cavity, 132-fixture cavity locking bolt, 133-drive shaft locking bolt, 134-rotating shaft, 14-planetary reducer, 15-motor. DETAILED DESCRIPTION

[0025] In order to enhance the understanding of the present invention, the present invention will be described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0026] like Figure 1 The vertical end face contact friction and wear testing machine shown includes a base 1, two columns are fixedly welded on the upper part of the base as a mounting frame 2, the upper end of the mounting frame 2 is connected to an upper mounting seat 3 by bolts, and the lower end is connected to a lower mounting seat 4 by bolts, and a loading mechanism and a measuring structure are installed inside the mounting frame 2, and the loading mechanism includes a nut follower block 5.

[0027] like Figure 2The figure shows the structure of the nut follower block 5. The nut follower block 5 is L-shaped, and a plurality of through holes are arranged on its inner side, in which the guide rail 6, the ball screw 7 and the measuring structure are respectively installed, wherein the ball screw 7 includes a support seat fixed on the lower mounting seat 4, a screw is threadedly connected to the upper part of the support seat, and the top of the screw passes through the upper mounting seat 3 and is connected to the servo motor 8 through a coupling. Support seats are respectively arranged at both ends of the guide rail 6, and are fixedly connected to the upper mounting seat 3 and the lower mounting seat 4 by bolts and nuts. The track of the guide rail 6 is an optical axis structure.

[0028] like Figure 1 and Figure 3 As shown, the uppermost part of the measuring structure is a pressure sensor module 9, which includes a force transmission member 91 and a sensor placement box 92 located at the lower part of the force transmission mechanism. The force transmission member 91 is bolted to the nut follower block 5 through the through hole on the nut follower block 5. The lower part of the force transmission member 91 extends out of the body of the force transmission member 91, which is hollowly sleeved in the sensor placement box 92. A pressure sensor is placed in the sensor placement box 92. When the pressure sensor is not subjected to load, the sensor placement box 92 is supported by the lower extension of the force transmission member 91, and the upper end face of the pressure sensor does not contact the bottom end face of the force transmission member 91 at this time; when the pressure sensor is subjected to pressure load, the bottom end face of the force transmission member 91 will contact the upper end face of the pressure sensor and apply pressure, so that the applied load size can be measured. The output end of the pressure sensor is connected to the input end of the loading controller to transmit the pressure value to the loading controller, and then the output end of the loading controller is connected to the servo motor 8. The loading controller will detect the data detected by the pressure sensor in real time, and send out a control signal to control the servo motor 8 to make adjustments, and realize load control through a closed-loop control system, ensuring that the load size between samples reaches the preset value and is stable.

[0029] like Figure 4 As shown, a plurality of through holes are provided at the bottom of the sensor placement box 92, and the torque sensor module 10 is bolted to the pressure sensor module 9 through the through holes. The output end of the torque sensor module 10 is connected to the data acquisition system. The data acquisition system uses the USB3101A multi-function data acquisition card launched by Beijing Altai Company. The analog input resolution is 16 bits, the acquisition rate is 100 kps, the analog output resolution is 14 bits, the acquisition rate is 50 kps, and it can output 2-channel analog synchronously, 16 programmable I / Os, and uses a portable USB interface and screws to stabilize the output, and supports LabVIEW seamless connection; the acquisition card is powerful and supports single-point sampling, limited-point sampling, and continuous sampling. The torque sensor module uses the DAYSENSOR brand model DYJN-104 double-flange torque sensor.

[0030] The bottom of the torque sensor module 10 is fixedly connected to the flange 11, the bottom of the flange 11 is bolted to the universal joint 12, and the bottom of the universal joint 12 is bolted to the sample fixture 13. The purpose of installing a universal joint 12 on the upper end of the upper sample fixture 13 is to enable the upper sample to fine-tune its angle in real time during friction, to ensure that the end faces of the two disc samples are fully fitted and evenly stressed when the upper and lower samples rotate and rub against each other, and to ensure stable friction between the samples.

[0031] like Figure 5 As shown, the sample fixture 13 includes a fixture cavity 131, a fixture cavity locking bolt 132 is arranged on one side of the fixture cavity, a rotating shaft 134 is arranged on one end surface of the fixture cavity, and a transmission shaft locking bolt 133 is arranged at the connection between the rotating shaft 134 and the fixture cavity 131. According to the test requirements, in order to meet the needs of samples with different radii, multiple sets of fixture cavities 131 with different radii can be designed according to the radius size of the sample, and they can be replaced by adjusting the transmission shaft locking bolt 133.

[0032] Two sample holders 13 are symmetrically arranged in the upper and lower parts, respectively used to place the upper sample and the lower sample. The rotating shaft 134 of the lower sample holder 13 is matched and connected with the output shaft of the planetary reducer 14 to ensure synchronous rotation with the output shaft of the reducer. The input end of the planetary reducer 14 is connected to the motor 15.

[0033] During the test, the data that the testing machine ultimately measures are the friction force and the friction coefficient. The torque is measured by the torque sensor module 10 installed above the sample fixture 13, and the torque signal is converted into an electrical signal, which is then collected by the data acquisition system. The load between the upper and lower samples is preset in advance, and closed-loop control is achieved through the loading controller. Knowing the magnitude of the torque and load, the computer calculates the real-time friction force and friction coefficient between the upper and lower samples through formula calculation and data processing, and displays the obtained data in real time.

[0034] The embodiments disclosed in the present utility model are preferred embodiments, but are not limited thereto. Ordinary technicians in this field can easily understand the spirit of the present utility model based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present utility model, they are all within the protection scope of the present utility model.

Claims

1. A vertical end face contact friction and wear testing machine, comprising a base (1), a mounting frame (2) fixed on the base, an upper mounting seat (3) being arranged at the upper end of the mounting frame (2), and a lower mounting seat (4) being arranged at the lower end, the lower mounting seat (4) being fixedly connected to the base (1), characterized in that: A loading mechanism and a measuring structure are installed inside the mounting frame (2), wherein the loading mechanism comprises a nut follower block (5), wherein a plurality of through holes are provided on the nut follower block (5), wherein guide rails (6), ball screws (7) and the measuring structure are installed in the through holes respectively, and the top of the ball screw (7) is connected to a servo motor (8).

2. The vertical end surface contact friction and wear testing machine according to claim 1, characterized in that: The ball screw (7) comprises a support seat fixed on a lower mounting seat, the upper portion of the support seat being threadedly connected to a screw rod, and the top of the screw rod being connected to a servo motor (8) via a coupling.

3. The vertical end surface contact friction and wear testing machine according to claim 1, characterized in that: Support seats are respectively arranged at both ends of the guide rail (6) and are fixedly connected to the upper mounting seat (3) and the lower mounting seat (4); the track of the guide rail is an optical axis structure.

4. The vertical end surface contact friction and wear testing machine according to claim 1, characterized in that: The measurement structure comprises a pressure sensor module (9).

5. The vertical end surface contact friction and wear testing machine according to claim 4, characterized in that: The pressure sensor module (9) comprises a force transmission component (91) and a sensor placement box (92) located below the force transmission component (91); the force transmission component (91) is connected to a nut follower block (5); and a pressure sensor is placed in the sensor placement box (92).

6. The vertical end surface contact friction and wear testing machine according to claim 4, characterized in that: The pressure sensor module (9) and the servo motor (8) are respectively connected to the input end and the output end of the loading controller.

7. The vertical end surface contact friction and wear testing machine according to claim 4, characterized in that: The lower end of the pressure sensor module (9) is fixedly connected to the torque sensor module (10), and the output end of the torque sensor module (10) is connected to a data acquisition system.

8. The vertical end surface contact friction and wear testing machine according to claim 7, characterized in that: The measuring structure comprises a sample fixture module, the upper part of which is connected to a torque sensor module (10) via a flange (11) and a universal joint (12), and the lower part of which is connected to a motor (15) via a planetary reducer (14).

9. The vertical end surface contact friction and wear testing machine according to claim 8, characterized in that: The sample fixture module comprises two sample fixtures (13) which are symmetrically arranged up and down.

10. The vertical end surface contact friction and wear testing machine according to claim 9, characterized in that: The sample fixture (13) comprises a fixture cavity (131), a fixture cavity locking bolt (132) is arranged on one side of the fixture cavity (131), a rotating shaft (134) is arranged on one end surface of the fixture cavity (131), and a transmission shaft locking bolt (133) is arranged at the connection between the rotating shaft (134) and the fixture cavity (131).

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