A friction and wear test simulation device suitable for joint motion pairs

Abstract

A friction and wear test simulation device suitable for joint motion pairs, belonging to the field of friction and wear test technology, includes a base plate, a driving actuator, a load simulation mechanism, a joint motion pair mechanism and a joint heating actuator; the driving actuator, the load simulation mechanism and the joint heating actuator are all arranged on the base plate, and the joint motion pair mechanism is connected between the driving actuator and the load simulation mechanism; the joint heating actuator is used in conjunction with the joint motion pair mechanism; a force sensor is arranged between the power output rod and the force transmission block of the load simulation driving cylinder; a temperature sensor is arranged at the end of the joint shaft pin of the joint motion pair mechanism; the surfaces of the two joint rods of the joint motion pair mechanism are both installed with inclination sensors, and the end of the first transmission shaft of the driving actuator is installed with an angle sensor. The present invention satisfies the simulation of the actual working conditions of heating and load, can truly reflect the friction and wear conditions of the joint motion pair, and provides technical support for the research related to the friction dynamics of the joint motion pair.

Description

Technical Field

[0001] The invention belongs to the technical field of friction and wear test, and in particular relates to a friction and wear test simulation device suitable for a joint motion pair. Background Art

[0002] Friction and wear are one of the main reasons for the decrease in transmission accuracy of the joint motion pair of the mechanism, which seriously affects the quality, performance and life of the mechanical equipment. Due to the existence of wear, the clearance of the joint motion pair will increase and the matching accuracy will decrease, which will cause the failure of the normal function of the entire device. In the process of friction and wear, friction and wear testing is one of the indispensable means.

[0003] With the rapid development of science and technology and industrial equipment, the working conditions of friction and wear tests are becoming more and more complex, and the requirements for data measurement accuracy are becoming higher and higher. Taking aircraft engines as an example, the friction and wear problems of related components have become a key factor affecting the reliability and life of the system. Therefore, in order to meet the design requirements of high reliability of aircraft engines, it is necessary to build a friction and wear testing machine with multi-condition coupling.

[0004] The Chinese patent application with the announcement number CN111982731A discloses a bushing friction and wear test device, which is mainly composed of a crankshaft, a crankshaft mounting seat supported at both ends of the crankshaft, a force cylinder, and a test cylinder provided at each eccentric part of the crankshaft. The friction pair composed of the bushing at the end of the test cylinder and the crankshaft is simulated by rotating the crankshaft and adjusting the load of the force cylinder. During the test, the bushing is installed between the eccentric part of the crankshaft and the axis of the piston rod of the test cylinder. A pressure sensor is installed at the oil hole of the test cylinder, and a displacement sensor is installed on the piston rod of the test cylinder. The pressure sensor and the displacement sensor are connected to the control system signal, and the control system controls the movement of the test cylinder and the force cylinder. However, the loading range of this scheme is mainly determined by the stroke of the force cylinder, and the influence of temperature on the kinematic pair is not taken into account, so the motion state of the mechanism cannot be truly simulated.

[0005] The Chinese patent application with announcement number CN202330199U discloses a friction and wear testing machine that uses a crank-connecting rod mechanism to achieve rotation and reciprocating motion. The testing machine is mainly composed of a driving mechanism, a loading mechanism, an electrical control system, and a data acquisition and processing system. The driving mechanism drives the turntable to rotate, so that the tested disk and the tested piece are in contact to form a friction pair. During the experiment, the turntable is driven by the main shaft to rotate, so that the upper test piece and the lower test piece form a friction pair to produce wear. The friction force is detected by the lever sensor and transmitted back for processing, realizing the friction and wear test in the form of rotation. However, this solution only realizes the rotation form and measures the friction force, and fails to reflect the movement form of the connecting rod that constitutes the kinematic pair under real working conditions.

[0006] The Chinese patent application with the announcement number CN117907215A discloses a device for measuring the friction coefficient of a rotating pair and a loading method thereof. The device is mainly composed of a first joint, a second joint, a pin, a torque sensor, a rotation driver and a linear loading actuator. During the test, multiple predetermined loads from small to large are applied to the second joint by the linear loading actuator, the pin is driven to rotate by the rotation driver, and the torque value of the torque sensor is obtained, and then the friction force of the first joint, the second joint and the pin under the predetermined load is calculated. However, the motion form of this scheme cannot simulate the real motion of the mechanism under complex conditions. Summary of the invention

[0007] In view of the problems existing in the prior art, the present invention provides a friction and wear test simulation device suitable for a joint motion pair, which can simultaneously meet the simulation of real working conditions of heating and load, and can more realistically reflect the friction and wear conditions of the joint motion pair, provide technical support for the dynamics-related research on the friction of the joint motion pair, and provide a solution reference for the subsequent research and development of the friction and wear testing machine.

[0008] In order to achieve the above-mentioned objectives, the present invention adopts the following technical scheme: a friction and wear test simulation device suitable for a joint motion pair, comprising a base plate, a drive actuator, a load simulation mechanism, a joint motion pair mechanism and a joint heating actuator; the drive actuator, the load simulation mechanism and the joint heating actuator are all arranged on the base plate, and the joint motion pair mechanism is connected between the drive actuator and the load simulation mechanism; the joint heating actuator is used in conjunction with the joint motion pair mechanism.

[0009] The driving actuator includes a joint driving motor, a first coupling, a torque measuring instrument, a second coupling, a first transmission shaft and a first bearing seat; the joint driving motor is horizontally fixed on the upper surface of the base plate, the motor shaft of the joint driving motor, the first coupling, the torque measuring instrument, the second coupling and the first transmission shaft are coaxially connected in series, and the first transmission shaft is rotatably mounted on the upper surface of the base plate through the first bearing seat.

[0010] The load simulation mechanism includes a load simulation driving cylinder, a force transmission block, a slider, a slide rail and a second transmission shaft; the load simulation driving cylinder is horizontally fixed on the upper surface of the base plate, the load simulation driving cylinder and the joint driving motor are vertically distributed, and the power output rod of the load simulation driving cylinder is connected to the force transmission block; the slide rail adopts a parallel double-track structure, the slide rail is horizontally fixed on the upper surface of the base plate, and the slide rail is parallel to the load simulation driving cylinder; the slider is arranged on the slide rail, and the slider is fixedly connected to the force transmission block; the second transmission shaft is horizontally fixed on the force transmission block, the second transmission shaft is vertically distributed to the slide rail, and an anti-friction bearing is mounted on the second transmission shaft.

[0011] The joint motion sub-mechanism includes a first joint rod, a second joint rod and a joint shaft pin; one end of the first joint rod is fixedly connected to the first transmission shaft, the other end of the first joint rod is hinged to one end of the second joint rod through the joint shaft pin, and the other end of the second joint rod is hinged to the second transmission shaft through an anti-friction bearing.

[0012] The joint heating actuator includes a heater, a posture adjustment frame, a third transmission shaft, a second bearing seat, a third coupling and a posture adjustment motor; the posture adjustment motor is horizontally fixed on the upper surface of the base plate, and the posture adjustment motor and the joint drive motor are coaxially distributed; the third transmission shaft is rotatably mounted on the upper surface of the base plate through the second bearing seat, one end of the third transmission shaft is coaxially fixedly connected to the motor shaft of the posture adjustment motor through the third coupling, and the other end of the third transmission shaft is fixedly connected to one end of the posture adjustment frame; the heater is installed at the other end of the posture adjustment frame, and the heater is located directly above the joint shaft pin of the joint motion sub-mechanism.

[0013] A force sensor is installed between the power output rod of the load simulation driving cylinder and the force transmission block.

[0014] A temperature sensor is installed at the end of the joint shaft pin.

[0015] A first inclination sensor is installed on the surface of the first joint rod, and a second inclination sensor is installed on the surface of the second joint rod.

[0016] An angle sensor is installed at the end of the first transmission shaft.

[0017] Beneficial effects of the present invention:

[0018] The friction and wear test simulation device suitable for joint motion pairs of the present invention can simultaneously meet the simulation of real working conditions of heating and loading, can more realistically reflect the friction and wear conditions of the joint motion pairs, provide technical support for dynamics-related research on the friction of joint motion pairs, and also provide a solution reference for the subsequent research and development of friction and wear testing machines. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a friction and wear test simulation device suitable for a joint motion pair of the present invention;

[0020] Figure 2 It is a structural schematic diagram of a friction and wear test simulation device suitable for a joint motion pair of the present invention (the joint heating actuator is not shown);

[0021] Figure 3 It is a structural schematic diagram of the load simulation mechanism of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the joint heating actuator of the present invention;

[0023] In the figure, 1 is a base plate, 2 is a joint drive motor, 3 is a first coupling, 4 is a torque meter, 5 is a second coupling, 6 is a first transmission shaft, 7 is a first bearing seat, 8 is a load simulation drive cylinder, 9 is a force transmission block, 10 is a slider, 11 is a slide rail, 12 is a second transmission shaft, 13 is an anti-friction bearing, 14 is a first joint rod, 15 is a second joint rod, 16 is a joint shaft pin, 17 is a heater, 18 is a posture adjustment swing frame, 19 is a third transmission shaft, 20 is a second bearing seat, 21 is a third coupling, 22 is a posture adjustment motor, 23 is a force sensor, 24 is a temperature sensor, 25 is a first inclination sensor, 26 is a second inclination sensor, and 27 is an angle sensor. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 1 to 4 As shown, a friction and wear test simulation device suitable for a joint motion pair includes a base plate 1, a driving actuator, a load simulation mechanism, a joint motion pair mechanism and a joint heating actuator; the driving actuator, the load simulation mechanism and the joint heating actuator are all arranged on the base plate 1, and the joint motion pair mechanism is connected between the driving actuator and the load simulation mechanism; the joint heating actuator is used in conjunction with the joint motion pair mechanism.

[0026] The driving actuator includes a joint driving motor 2, a first coupling 3, a torque measuring instrument 4, a second coupling 5, a first transmission shaft 6 and a first bearing seat 7; the joint driving motor 2 is horizontally fixed on the upper surface of the base plate 1, and the motor shaft of the joint driving motor 2, the first coupling 3, the torque measuring instrument 4, the second coupling 5 and the first transmission shaft 6 are coaxially connected in series, and the first transmission shaft 6 is rotatably mounted on the upper surface of the base plate 1 through the first bearing seat 7.

[0027] The load simulation mechanism includes a load simulation driving cylinder 8, a force transmission block 9, a slider 10, a slide rail 11 and a second transmission shaft 12; the load simulation driving cylinder 8 is horizontally fixed on the upper surface of the base plate 1, the load simulation driving cylinder 8 is vertically distributed with the joint driving motor 2, and the power output rod of the load simulation driving cylinder 8 is connected with the force transmission block 9; the slide rail 11 adopts a parallel double-track structure, the slide rail 11 is horizontally fixed on the upper surface of the base plate 1, and the slide rail 11 is parallel to the load simulation driving cylinder 8; the slider 10 is arranged on the slide rail 11, and the slider 10 is fixedly connected with the force transmission block 9; the second transmission shaft 12 is horizontally fixedly installed on the force transmission block 9, the second transmission shaft 12 is vertically distributed with the slide rail 11, and an anti-friction bearing 13 is mounted on the second transmission shaft 12.

[0028] The joint motion sub-mechanism includes a first joint rod 14, a second joint rod 15 and a joint shaft pin 16; one end of the first joint rod 14 is fixedly connected to the first transmission shaft 6, the other end of the first joint rod 14 is hinged to one end of the second joint rod 15 through the joint shaft pin 16, and the other end of the second joint rod 15 is hinged to the second transmission shaft 12 through the anti-friction bearing 13.

[0029] The joint heating actuator includes a heater 17, a posture adjustment swing frame 18, a third transmission shaft 19, a second bearing seat 20, a third coupling 21 and a posture adjustment motor 22; the posture adjustment motor 22 is horizontally fixed on the upper surface of the base plate 1, and the posture adjustment motor 22 is coaxially distributed with the joint drive motor 2; the third transmission shaft 19 is rotatably installed on the upper surface of the base plate 1 through the second bearing seat 20, one end of the third transmission shaft 19 is coaxially fixedly connected with the motor shaft of the posture adjustment motor 22 through the third coupling 21, and the other end of the third transmission shaft 19 is fixedly connected to one end of the posture adjustment swing frame 18; the heater 17 is installed at the other end of the posture adjustment swing frame 18, and the heater 17 is located directly above the joint shaft pin 16 of the joint motion sub-mechanism. In this embodiment, the heater 17 adopts an inverted U-shaped structure, and a quartz radiation heater is specifically selected.

[0030] A force sensor 23 is installed between the power output rod of the load simulation driving cylinder 8 and the force transmission block 9 .

[0031] A temperature sensor 24 is installed at the end of the joint shaft pin 16 .

[0032] A first inclination sensor 25 is mounted on the surface of the first joint rod 14 , and a second inclination sensor 26 is mounted on the surface of the second joint rod 15 .

[0033] An angle sensor 27 is installed at the end of the first transmission shaft 6 .

[0034] The following describes a one-time use process of the present invention in conjunction with the accompanying drawings:

[0035] First, the test is carried out under normal temperature environment. The joint heating actuator is not activated temporarily, and the joint driving motor 2 of the driving actuator and the load simulation driving cylinder 8 of the load simulation mechanism are started synchronously.

[0036] When the joint drive motor 2 is started, it will synchronously drive the first coupling 3, the torque meter 4, the second coupling 5 and the first transmission shaft 6 to rotate. The rotating first transmission shaft 6 will drive the first joint rod 14 to swing, and then drive the second joint rod 15 to move in space. At this time, the joint motion pair formed by the first joint rod 14, the second joint rod 15 and the joint shaft pin 16 will synchronously generate friction.

[0037] As the second joint rod 15 moves in space, it will synchronously drive the second transmission shaft 12, the force transmission block 9, the force sensor 23 and the slider 10 to move linearly along the slide rail 11. At this time, the load simulation drive cylinder 8 will generate load resistance to the linear motion to simulate the stress state of the load when working.

[0038] During the normal temperature test, the measurement data of the torque meter 4, the force sensor 23, the temperature sensor 24, the first inclination sensor 25, the second inclination sensor 26 and the angle sensor 27 are summarized in real time into the computer to analyze the friction and wear law of the joint motion pair under normal temperature environment.

[0039] Subsequently, the test in the high temperature environment can be carried out, and the activation method of the driving actuator and the load simulation mechanism is exactly the same as that in the normal temperature environment. The difference is that the posture adjustment motor 22 and the heater 17 of the joint heating actuator also need to be started synchronously.

[0040] When the attitude adjustment motor 22 is started, it will synchronously drive the third coupling 21 and the third transmission shaft 19 to rotate. The rotating third transmission shaft 19 will drive the attitude adjustment swing frame 18 to swing, and the swing frequency and amplitude of the attitude adjustment swing frame 18 are exactly the same as those of the first joint rod 14, so that the positions of the heater 17 and the joint shaft pin 16 are relatively fixed, thereby ensuring that the high temperature environment of the joint motion pair formed by the first joint rod 14, the second joint rod 15 and the joint shaft pin 16 is relatively stable, and the heating temperature of the heater 17 can be dynamically adjusted according to test needs.

[0041] During the high temperature test, the measurement data of the torque meter 4, the force sensor 23, the temperature sensor 24, the first inclination sensor 25, the second inclination sensor 26 and the angle sensor 27 are summarized in real time into the computer to analyze the friction and wear laws of the joint motion pair under high temperature environment.

[0042] The solutions in the embodiments are not intended to limit the protection scope of the present invention. All equivalent implementations or changes that do not deviate from the present invention are included in the protection scope of the present invention.

Claims

1. A friction and wear test simulation device suitable for joint motion pairs, characterized by: It includes a base plate, a driving actuator, a load simulation mechanism, a joint motion sub-mechanism and a joint heating actuator; the driving actuator, the load simulation mechanism and the joint heating actuator are all arranged on the base plate, the joint motion sub-mechanism is connected between the driving actuator and the load simulation mechanism; the joint heating actuator is used in conjunction with the joint motion sub-mechanism; The driving actuator comprises a joint driving motor, a first coupling, a torque measuring instrument, a second coupling, a first transmission shaft and a first bearing seat; the joint driving motor is horizontally fixed on the upper surface of the base plate, the motor shaft of the joint driving motor, the first coupling, the torque measuring instrument, the second coupling and the first transmission shaft are coaxially connected in series, and the first transmission shaft is rotatably mounted on the upper surface of the base plate through the first bearing seat; The load simulation mechanism comprises a load simulation driving cylinder, a force transmission block, a slider, a slide rail and a second transmission shaft; the load simulation driving cylinder is horizontally fixed on the upper surface of the base plate, the load simulation driving cylinder is vertically distributed with the joint driving motor, and the power output rod of the load simulation driving cylinder is connected with the force transmission block; the slide rail adopts a parallel double-track structure, the slide rail is horizontally fixed on the upper surface of the base plate, and the slide rail is parallel to the load simulation driving cylinder; the slider is arranged on the slide rail, and the slider is fixedly connected with the force transmission block; the second transmission shaft is horizontally fixedly installed on the force transmission block, the second transmission shaft is vertically distributed with the slide rail, and a friction-reducing bearing is mounted on the second transmission shaft; The joint motion sub-mechanism comprises a first joint rod, a second joint rod and a joint shaft pin; one end of the first joint rod is fixedly connected to the first transmission shaft, the other end of the first joint rod is hinged to one end of the second joint rod through the joint shaft pin, and the other end of the second joint rod is hinged to the second transmission shaft through an anti-friction bearing; The joint heating actuator includes a heater, a posture adjustment frame, a third transmission shaft, a second bearing seat, a third coupling and a posture adjustment motor; the posture adjustment motor is horizontally fixed on the upper surface of the base plate, and the posture adjustment motor and the joint drive motor are coaxially distributed; the third transmission shaft is rotatably mounted on the upper surface of the base plate through the second bearing seat, one end of the third transmission shaft is coaxially fixedly connected to the motor shaft of the posture adjustment motor through the third coupling, and the other end of the third transmission shaft is fixedly connected to one end of the posture adjustment frame; the heater is installed at the other end of the posture adjustment frame, and the heater is located directly above the joint shaft pin of the joint motion sub-mechanism.

2. A friction and wear test simulation device suitable for joint motion pairs according to claim 1, characterized in that: A force sensor is installed between the power output rod of the load simulation driving cylinder and the force transmission block.

3. A friction and wear test simulation device suitable for joint motion pairs according to claim 1, characterized in that: A temperature sensor is installed at the end of the joint shaft pin.

4. A friction and wear test simulation device suitable for joint motion pairs according to claim 1, characterized in that: A first inclination sensor is installed on the surface of the first joint rod, and a second inclination sensor is installed on the surface of the second joint rod.

5. A friction and wear test simulation device suitable for joint motion pairs according to claim 1, characterized in that: An angle sensor is installed at the end of the first transmission shaft.

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