CN101017129B - Multifunctional micro friction wear testing machine - Google Patents

Abstract

A multifunctional micro-friction and wear testing machine is composed of a driving device, a moving device connected with the driving device, a loading and measuring device arranged above the moving device, and a lifting platform connected with the loading and measuring device. The cantilever elastic plate and connecting rod are used to articulate the driving device and the moving device. Under the push of the connecting rod, the sliding table (or rotating table) produces fretting wear in the form of reciprocating linear motion (or twisting) with a small amplitude. The amplitude is constant and the error Small; the mechanical driving method of using the motor to directly drive the connecting rod to push the sliding table (or rotating table) produces a large-amplitude reciprocating linear motion (or twisting) in the form of wear, and the driving force is large and stable; by adjusting the center of the eccentric body The hinged position of the connecting rod can realize reciprocating linear motion (or twisting) with different amplitudes, which can meet the requirements of various experimental conditions. The movement mechanism is arranged reasonably, and can be quickly switched to meet the experimental requirements, and the loading is more stable and rapid.

Description

Multifunctional micro friction and wear testing machine

technical field

The invention relates to a testing machine, in particular to a multifunctional micro-friction and wear testing machine. the

Background technique

When two objects in contact with each other undergo relative motion or tend to move relative to each other under the action of external force P, the tangential resistance F generated on the contact surface is called friction force, and this resistance phenomenon is called friction. According to the motion form of the kinematic pair, it can be divided into sliding friction and rolling friction. In the laboratory, the forms of sliding friction mainly include ring-one type, pin-disk type, end-face friction type, and fretting wear type. The fretting wear testing machine produces small-amplitude relative sliding between two contact surfaces, and the small-amplitude sliding mainly includes three methods: mechanical drive, fluid drive and electromagnetic drive. The mechanical drive can utilize cams, levers, unbalanced rotation, or elastic expansion and contraction of one of the micro-motion pairs. Lever, cam, etc. can work under large amplitude, and the load can also change in any range, but the frequency generally does not exceed 50Hz. The elastic expansion and contraction mode of the sample is limited by the elastic limit of the material, so it can only work at a lower amplitude, and its frequency range depends on the driving source. Electromagnetic methods generally use electromagnetic vibration or use functional materials to generate vibration, which can work at high frequencies, but this type of equipment can only work under small loads. The electro-hydraulic servo drive method is adopted, which has the advantages of large driving force, wide range of amplitude and frequency fluctuations, and easy use of computer program control and measurement, but the technology is more complicated, the cost is higher, and the equipment volume is also larger. the

For the above-mentioned wear forms, there are already many kinds of testing machines, such as M2000 friction and wear testing machine, vertical universal wear testing machine, pin-on-disc friction and wear testing machine, CETR testing machine, etc., these testing machines are mostly single-wear testing machines , The CETR testing machine can test the reciprocating linear motion and the rotating form of different amplitudes, but it cannot test the twisting motion form. There is no multifunctional friction and wear testing machine that combines the reciprocating linear motion and twisting of different amplitudes at home and abroad. the

Contents of the invention

The purpose of the present invention is to solve the problems existing in the prior art, and to provide a multi-functional micro-screw that can combine various wear motion forms such as large-amplitude reciprocating linear motion, small-amplitude reciprocating linear motion, large-angle twisting, and small-angle twisting. Friction and wear testing machine. the

For achieving the above object, the solution of the present invention is: it is made of drive unit, the kinematic device that links to each other with drive unit, is located at the loading and measuring device above the kinematic device and connects the lifting platform of loading and measuring device. the

The driving device is composed of a motor bracket arranged on the bottom plate, a stepping motor installed on the motor bracket and an eccentric body, the eccentric body is connected with the stepping motor, and a connecting rod hinged to the lower end of the eccentric body is provided; The moving device is composed of a sliding seat on the bottom plate and a sliding table matched with it; the moving device is composed of a support on the bottom plate and a rotating table matching it; the loading and measuring The device includes a console, a connecting block connected to the sensor is provided under the console, a slide rail is provided between the connecting block and the console, and a positioning device is provided. The positioning device is composed of a stepping motor and a screw connected to the connecting block. Composition; the lifting table includes a fixed frame located on the bottom plate, the side of the fixed frame is provided with a square guide rail that provides loading and measuring devices to move up and down, and the top is provided with a stepping motor that controls the movement of the ball screw, and the ball screw and The loading and measuring device is connected; the driving device and the moving device can be connected through a hinged cantilever elastic plate and a connecting rod, or can be directly connected through a connecting rod hinge; The sensor is a force sensor; the sensor in the loading and measuring device correspondingly arranged on the turntable is a torque sensor. the

The beneficial effects of the present invention are:

(1) Four types of friction and wear motion experiments can be realized, combining large-amplitude reciprocating linear motion, small-amplitude reciprocating linear motion, large-angle twisting, and small-angle twisting together;

(2) The mechanical excitation method is adopted, and the driving force is large;

(3) The testing machine has few moving links, and the hinged parts are connected by precision bearings, with constant amplitude and small error; the whole testing machine is designed in a modular manner, and the testing machine is divided into four modules, and corresponding modules can be selected for assembly according to needs. The function switching is convenient, the modules are arranged reasonably on the bottom plate of the testing machine, the structure is reasonable, easy to process and easy to install. the

Description of drawings

Fig. 1 is a structural front view of Embodiment 1 of the present invention. the

Fig. 2 is a side view of the first embodiment of the present invention. the

Fig. 3 is a structural top view of Embodiment 1 of the present invention. the

Fig. 4 is a front view of the structure of Embodiment 2 of the present invention. the

Fig. 5 is a top view of the second embodiment of the present invention. the

Fig. 6 is a front view of the structure of Embodiment 3 of the present invention. the

Fig. 7 is a top view of the structure of the third embodiment of the present invention. the

Fig. 8 is a front view of the fourth embodiment of the present invention. the

Fig. 9 is a top view of the fourth embodiment of the present invention. the

In the figure: connecting rod 1, 20, 26, eccentric body 2, motor bracket 3, stepper motor 4, 5, 8, ball screw 6, console 7, lead screw 9, slide rail 10, coupling block 11, force Sensor 12, upper sample 13, sliding table 14, bottom plate 15, sliding seat 16, fixed frame 17, square guide rail 18, lower sample 19, bracket 21, cantilever elastic plate 22, torque sensor 23, rotating table 24, support 25. the

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

Embodiment 1: As shown in Fig. 1, Fig. 2 and Fig. 3, the micro-friction and wear testing machine is composed of a driving device, a moving device, a loading and measuring device and a lifting platform arranged on the bottom plate 15, and the driving device passes through a cantilever fixed on the support 21 The elastic plate 22 and the connecting rod 1, 20 are hinged together with the movement device. According to the proportional amplification and elastic bending effect of the cantilever elastic plate 22, a small vibration amplitude is generated at the hinge joint between the cantilever elastic plate 22 and the connecting rod 20, and the small amplitude is generated by the connecting rod. Transfer to the sliding table (or rotating table). The loading and measuring device is connected with the lifting platform and is located above the moving device. The driving device is composed of a motor bracket 3, a stepping motor 4 and an eccentric body 2, the stepping motor 4 is arranged on the motor bracket 3, the eccentric body 2 is connected to the transmission shaft of the stepping motor 4, and the lower end of the eccentric body 2 is provided with a hinge joint Connecting rods 1 together. The rotating speed of the stepping motor 4 is controlled by the pulse signal of the stepping motor controller, and the rotating speed of the motor can be changed by adjusting the pulse signal of the controller. The moving device is composed of a sliding seat 16 and a sliding table 14 matched with it. The lower sample 19 is arranged on the sliding table 14, and the sliding table 14 drives a linear reciprocating motion with a small amplitude. The loading and measuring device is composed of a console 7, a connection block 11 and a force sensor 12 sequentially connected under the console 7, an upper sample 13 is installed under the force sensor 12, and the connection block 11 is connected with the console 7 through a slide rail 10, The side of the coupling block 11 is provided with a positioning device composed of a stepping motor 8 and a lead screw 9 connected thereto. Lifting platform is made of fixed frame 17, ball screw 6 and stepper motor 5, and fixed frame 17 side is provided with square guide rail 18, and the chute on the console 7 in loading and measuring device cooperates with square guide rail 18, and fixed frame The top of 17 is provided with the stepping motor 5 that controls ball screw 6 motion, and ball screw 6 links to each other with loading and measuring device. Friction and wear movement occurs between the upper sample 13 and the lower sample 19 . The upper sample 13 is driven by the motor 5, and the loading and measuring device can be adjusted to the required height through the rotation of the ball screw 6, and the left and right positions are adjusted by the motor 8, the screw 9, and the slide rail 10. the

Embodiment 2: As shown in Fig. 4 and Fig. 5, the components of the mechanism are basically the same as in Embodiment 1, the difference is that the movement device connected to the drive device is composed of a support 25 and a rotating table 24 matched therewith, and the lower sample 19 It is fixed on the turntable 24, and the sensor in the loading and measuring device corresponding to the turntable 24 is a torque sensor 23. The turntable 24 is hinged with the connecting rod 20, and twists back and forth together with the connecting rod 20, so that the lower sample 19 and the upper sample 13 generate twisting friction and wear motion, and the magnitude of the torque is detected by the torque sensor 23. the

Embodiment 3: As shown in Fig. 6 and Fig. 7, the mechanism components are basically the same as in Embodiment 1, the difference is that the connecting rod 26 of the driving device is directly hingedly connected with the sliding table 14 of the moving device, and the driving device is located close to the On the side of the moving device, the bracket 21 and the cantilever elastic plate 22 arranged on the bracket 21 are removed. Since the proportional amplification link of the cantilever elastic plate is reduced in the middle, the slide table 14 can obtain a relatively large linear reciprocating motion, so that the lower sample 19 and the upper sample 13 produce friction and wear motion with relatively large amplitude, and the magnitude of the friction force is detected by the force sensor 12 . the

Embodiment 4: As shown in Fig. 8 and Fig. 9, the mechanism components are basically the same as in Embodiment 2, the difference is that the connecting rod 26 of the driving device is directly hingedly connected with the rotating table 24 of the moving device, so that the rotating table 24 can be used as Larger angles of twisting. The driving device is located next to the turntable 24, and the support 21 and the cantilever elastic plate 22 arranged on the support 21 are removed. Since the proportional amplification link of the cantilever elastic plate is reduced in the middle, a relatively large angle of twisting motion can be obtained. The lower sample 19 is fixed on the rotating table 24, the rotating table 24 is hinged with the connecting rod 26, and the rotating table 24 twists together with the connecting rod 26, and a larger angle of twisting is generated between the lower sample 19 and the upper sample 13 The torque of the friction and wear movement is detected by the torque sensor 23 . the

Claims (5)

1. multifunctional micro friction wear testing machine, comprise drive unit, the telecontrol equipment that links to each other with drive unit, be located at the loading and the measurement mechanism of telecontrol equipment top, the lifting table that connects loading and measurement mechanism, it is characterized in that: described drive unit is made of the stepper motor (4) and the eccentric body (2) that are located at electric machine support (3) on the base plate (15), be installed on the electric machine support (3), eccentric body (2) links to each other with stepper motor (4), and eccentric body (2) lower end is provided with the connecting rod hinged with it (1); Described telecontrol equipment is made of the slide unit (14) that is located at the slide (16) on the base plate (15) and matches with it, or is made of the turntable (24) that is located at the bearing (25) on the base plate (15) and matches with it; Described loading and measurement mechanism comprise control desk (7), and control desk (7) has the coupling block (11) that links to each other with sensor, are provided with slide rail (10) between coupling block (11) and the control desk (7), and are provided with locating device; Described lifting table comprises the fixed mount (17) that is located on the base plate (15), the square guide rail (18) that provides loading and measurement mechanism to move up and down is provided in fixed mount (17) side, the top is provided with the stepper motor (5) of control ball-screw (6) motion, and ball-screw (6) links to each other with loading and measurement mechanism.

2. multifunctional micro friction wear testing machine according to claim 1 is characterized in that: described locating device is made of with the leading screw (9) that is connected with coupling block (11) stepper motor (8).

3. multifunctional micro friction wear testing machine according to claim 1, it is characterized in that: described drive unit is connected with second connecting rod (20) by first connecting rod (1) articulating boom elastic plate (22) with telecontrol equipment, or directly is hinged and connected by third connecting rod (26) and connects.

4. multifunctional micro friction wear testing machine according to claim 1 is characterized in that: it is force transducer (12) that described slide unit (14) is gone up corresponding loading and the sensor in the measurement mechanism that is provided with.

5. multifunctional micro friction wear testing machine according to claim 1 is characterized in that: it is torque sensor (23) that described turntable (24) is gone up corresponding loading and the sensor in the measurement mechanism that is provided with.

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