Friction and wear test bench for sealing element of magnetorheological damper

Abstract

The utility model relates to the technical field of friction-wear testing, and discloses a friction-wear testing stand for a magnetorheological damper sealing element, which comprises a base and a friction-wear testing machine, the friction-wear testing machine is fixedly mounted on the rear side of the upper surface of the base, and a first linear guide rail is fixedly mounted on the front side of the upper surface of the base. A bedplate is fixedly mounted on the upper surface of a sliding table of the first linear guide rail, a simulation device is fixedly mounted on the upper surface of the bedplate, a U-shaped clamp is fixedly mounted at the lower end of a push rod of the friction wear testing machine, and a pin sample is mounted in the U-shaped clamp; a driving mechanism used for moving the platen is arranged on the upper surface of the base, and a switching assembly is installed at one end of the upper surface of the platen. According to the utility model, the assembly relation and the working environment of different types of sealing elements in the magnetorheological damper can be simulated, and the simulation test range is wide; and the working modes of uniform speed and variable speed can be generated and can be quickly switched according to simulation requirements, so that the friction wear test of the sealing element can be smoothly completed.

Description

Technical Field

[0001] The utility model relates to the technical field of friction and wear testing, in particular to a friction and wear testing platform for sealing elements of a magnetorheological damper. Background Art

[0002] A magnetorheological damper is a semi-active control device filled with magnetorheological fluid working medium. The required magnetic field strength is obtained by adjusting the input current in the excitation coil, thereby changing the rheological properties of the magnetorheological fluid and ultimately achieving the purpose of controlling the damping force.

[0003] During the operation of the magnetorheological damper, the reciprocating motion of the piston rod tends to form a fluid dynamic pressure effect at the wedge-shaped entrance of the sealing element, prompting iron powder to enter the sealing interface under the combined action of dynamic pressure and shear force, accelerating the wear of the sealing element. In addition, the rheological properties of the magnetorheological fluid change under the action of the magnetic field, and the iron powder gathers around the sealing element in a chain structure to form a barrier, thereby reducing the supply of base oil that can be used to improve boundary lubrication wear, ultimately leading to a significant increase in the degree of abrasive wear in the sealing interface and obvious "micro-cutting" marks on the surface of the piston rod.

[0004] In summary, although the movement mode of the magnetorheological damper is consistent with that of the traditional hydraulic cylinder, the wear mechanism of the sealing element is very different, and this difference is inevitably related to the composition and working characteristics of the magnetorheological fluid. In view of the normal distribution of the internal particle size distribution of the magnetorheological fluid, it is of great practical significance to study the influence of surface roughness and particle interaction on the wear of the magnetorheological fluid seal.

[0005] Therefore, based on the working principle of magnetorheological damper, a friction and wear test bench for magnetorheological damper sealing elements is proposed. Utility Model Content

[0006] The utility model aims to provide a friction and wear test bench for a sealing element of a magnetorheological damper, aiming to reproduce the friction and wear conditions of the sealing element under a magnetorheological fluid working environment, so as to deeply study the seal wear mechanism.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A friction and wear test bench for a magnetorheological damper sealing element comprises a base and a friction and wear tester, and is characterized in that: a friction and wear tester is fixedly mounted on the rear side of the upper surface of the base, a first linear guide is fixedly mounted on the front side of the upper surface of the base, a table is fixedly mounted on the upper surface of the slide table of the first linear guide, a simulation device is fixedly mounted on the upper surface of the table, a U-shaped clamp is fixedly mounted on the lower end of the push rod of the friction and wear tester, a pin sample is mounted inside the U-shaped clamp; a driving mechanism for moving the table is provided on the upper surface of the base, and a switching assembly is mounted on one end of the upper surface of the table.

[0009] Specifically, the simulation device includes a cylinder body, an excitation coil and a symbol block. The bottom of the cylinder body is mounted on a table by screws, the excitation coil is installed in the inner cavity of the cylinder body, a liquid carrier tank for containing magnetorheological fluid is provided on the inner side of the cylinder body, and a symbol block for fixing a sealing element is installed at the bottom of the liquid carrier tank.

[0010] Furthermore, a groove matching the shape of the pin sample is formed on the top of the symbol block, and an adapting groove is formed in the groove. Baffles are installed at both ends of the upper surface of the symbol block, and the baffles block both ends of the adapting groove.

[0011] Furthermore, the pin sample is connected and assembled with the U-shaped clip by screws, the symbol block is connected and assembled with the cylinder body by screws, and the baffle is connected and assembled with the symbol block by screws.

[0012] Specifically, the driving mechanism includes a second linear guide, a first servo motor, a turntable and an electric lead screw module. The electric lead screw module is fixedly installed on the upper surface of the base and located in front of the first linear guide. The second linear guide and the first servo motor are fixedly installed on the upper surface of the base and located on the rear side of the first linear guide. The output end of the first servo motor is connected to the turntable, and one end of the transmission rod is rotatably installed at the edge of the turntable, and the other end of the transmission rod is rotatably assembled with the slide table of the second linear guide.

[0013] Optionally, the switching component includes a transmission bolt and a screw hole, the second linear guide rail and the top of the slide table of the electric screw module are both provided with a blind hole, the table plate is provided with a pair of screw holes, one of the screw holes is threaded with a transmission bolt, and the transmission bolt is assembled with the corresponding blind hole.

[0014] Optionally, the switching assembly includes a T-shaped rod, a second servo motor and a long hole, the table is provided with a pair of upper long holes, the second linear guide rail and the slide table of the electric screw module are provided with lower long holes, the second servo motor is fixedly installed on the upper surface of the table, and the output end of the second servo motor is fixedly installed, and the T-shaped rod is inserted into the upper long hole and the lower long hole on the same side.

[0015] The beneficial effects of the utility model are:

[0016] Through the coordination of friction and wear tester, pin sample and simulation device, the assembly relationship and working environment of different types of sealing elements in magnetorheological damper can be simulated, and the range of simulation test is wide;

[0017] By cooperating with the switching components and the driving mechanism, uniform speed and variable speed working modes can be generated, and rapid switching can be performed according to simulation requirements to smoothly complete the friction and wear test of the sealing element;

[0018] This test bench can be used to analyze the causes of accelerated wear of sealing components under different motion modes and damping, which is conducive to finding ways to increase the service life of sealing components and ultimately guide the actual production of magnetorheological dampers. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic front view of the structure of the utility model;

[0020] Figure 2 It is a schematic cross-sectional view of the structure of the simulation device of the utility model;

[0021] Figure 3 It is a schematic top view of the structure of the driving mechanism of the utility model;

[0022] Figure 4 This is a left side view showing the structure of the second switching component of the utility model.

[0023] In the figure: 1 friction and wear testing machine, 2 U-shaped clamp, 3 simulation device, 31 cylinder body, 32 excitation coil, 33 excitation coil, 34 adapter slot, 35 symbol block, 4 switching assembly, 41 transmission bolt, 42 T-shaped rod, 43 second servo motor, 44 upper long hole, 5 first linear guide, 6 driving mechanism, 61 electric lead screw module, 62 second linear guide, 63 first servo motor, 64 turntable, 7 base, 8 table, 9 pin sample, 10 blind hole, 11 lower long hole. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0025] See also Figure 1The utility model provides a friction and wear test bench for a sealing element of a magnetorheological damper, comprising a base 7 and a friction and wear tester 1, wherein the base 7 plays a supporting role, and the friction and wear tester 1 is an existing device having structures such as an electric cylinder and a pressure sensor, wherein the friction and wear tester 1 is fixedly installed on the rear side of the upper surface of the base 7, and a first linear guide 5 is fixedly installed on the front side of the upper surface of the base 7, and a table 8 is fixedly installed on the upper surface of the slide table of the first linear guide 5, and a simulation device 3 is fixedly installed on the upper surface of the table 8, and the simulation device 3 is used to simulate the working mode of the magnetorheological damper, and a U-shaped clamp 2 is fixedly installed on the lower end of the push rod of the friction and wear tester 1, and a pin sample 9 is installed inside the U-shaped clamp 2, and the pin sample 9 is horizontally arranged and the first linear guide 5 is parallel to the pin sample 9, and the pin sample 9 can be replaced in the U-shaped clamp 2, and matched with the corresponding simulation device 3, and the pin sample 9 can be extended into the simulation device 3 and adjust the contact force after the friction and wear tester 1 is raised and lowered.

[0026] The upper surface of the base 7 is provided with a driving mechanism 6 for moving the table 8, and a switching component 4 is installed at one end of the upper surface of the table 8; the driving mechanism 6 has two driving modes, and the translation mode of the table 8 can be changed by switching the switching component 4, thereby driving the simulation device 3 to move repeatedly along the first linear guide rail 5.

[0027] Specifically, Figure 2 As shown, the simulation device 3 includes a cylinder 31, an excitation coil 32 and a symbol block 35. The cylinder 31 is composed of a base, an inner cylinder, an outer cylinder and a cover, forming an inner cavity and a liquid carrier tank. The base and the outer cylinder are made of materials with good magnetic conductivity and low hysteresis loss, such as Q235 carbon structural steel. The process of magnetization generated by energizing the excitation coil 32 is inevitably accompanied by the release of heat. In order not to affect the working performance of the magnetorheological fluid, the inner cylinder will be made of PBT plastic material with poor thermal conductivity and non-magnetic conductivity. It is convenient to guide the magnetic lines of force to flow into the interior of the magnetorheological fluid to maximize the magnetorheological effect; the excitation coil selects enameled wire with low resistivity; the bottom of the cylinder 31 is mounted on the table 8 by screws, and an excitation coil 32 is installed in the inner cavity of the cylinder 31. The inner side of the cylinder 31 is provided with a liquid carrier tank for containing the magnetorheological fluid. When the excitation coil 32 is energized, a magnetic field of controllable intensity can be generated, thereby changing the viscosity of the magnetorheological fluid. A symbol block 35 for fixing the sealing element is installed at the bottom of the liquid carrier tank, and the symbol block 35 is immersed in the magnetorheological fluid.

[0028] A groove matching the shape of the pin sample 9 is formed on the top of the symbol block 35, and an adapting groove 34 is formed in the groove. The shape of the adapting groove 34 is half of the sealing element. Baffles 33 are installed at both ends of the upper surface of the symbol block 35. The baffles 33 block the two ends of the adapting groove 34. After the sealing element is cut in half, it can be put into the adapting groove 34 and fixed by the baffles 33.

[0029] The pin sample 9 is connected and assembled with the U-shaped clip 2 by screws, which is convenient for replacing pin samples 9 of different models; the symbol block 35 is connected and assembled with the cylinder body 31 by screws, which is convenient for replacing symbol blocks 35 of different models; the baffle 33 is connected and assembled with the symbol block 35 by screws, which is convenient for quickly installing and removing the lower half of the sealing element.

[0030] Specifically, Figure 3 As shown, the driving mechanism 6 includes a second linear guide rail 62, a first servo motor 63, a turntable 64 and an electric lead screw module 61. The electric lead screw module 61 is fixedly installed on the upper surface of the base 7 and located in front of the first linear guide rail 5. The electric lead screw module 61 is an existing component and can realize repeated movements at a uniform speed. After being connected with the switching component 4, it can drive the simulation device 3 to move repeatedly at a uniform speed.

[0031] A second linear guide 62 and a first servo motor 63 are fixedly installed on the upper surface of the base 7 and located at the rear side of the first linear guide 5. The output end of the first servo motor 63 is connected to a turntable 64. One end of a transmission rod is rotatably installed at the edge of the turntable 64, and the other end of the transmission rod is rotatably assembled with the slide of the second linear guide 62. When the first servo motor 63 is working, the turntable 64 is rotated, and after being transmitted by the transmission rod, the slide of the second linear guide 62 can be driven to move at a variable speed, and after being connected with the switching component 4, the simulation device 3 can be driven to move repeatedly at a variable speed.

[0032] Specifically, the two forms of the switching component 4 are as follows:

[0033] Form 1, such as Figure 1 , Figure 3 As shown, the switching component 4 includes a transmission bolt 41 and a screw hole, a blind hole 10 is provided on the top of the slide of the second linear guide 62 and the electric lead screw module 61, and a pair of screw holes is provided on the table 8, in which a transmission bolt 41 is screwed into one of the screw holes, and the transmission bolt 41 is plugged and assembled with the corresponding blind hole 10; when the transmission bolt 41 is screwed into the screw hole on the front side, the table 8 is connected to the slide of the electric lead screw module 61, and when the transmission bolt 41 is screwed into the screw hole on the rear side, the table 8 is connected to the slide of the second linear guide 62.

[0034] Form 2, such as Figure 4As shown, the switching component 4 includes a T-bar 42, a second servo motor 43 and a long hole 44, the table 8 is provided with a pair of upper long holes 44, the second linear guide 62 and the slide of the electric screw module 61 are provided with lower long holes 11, the second servo motor 43 is fixedly installed on the upper surface of the table 8, and the output end of the second servo motor 43 is fixedly installed with a T-bar 42, and the T-bar 42 is inserted into the upper long hole 44 and the lower long hole 11 on the same side; the setting of the upper long hole 44 and the lower long hole 11 will not interfere with the swinging action of the T-bar 42, and the second servo motor 43 can swing the T-bar 42 back and forth 180°. When inserted into the upper long hole 44 and the lower long hole 11 located on the front side, the table 8 is connected to the slide of the electric screw module 61, and when inserted into the upper long hole 44 and the lower long hole 11 located on the rear side, the table 8 is connected to the slide of the linear guide 62.

[0035] The working method of this embodiment is as follows:

[0036] The excitation coil 32 in the simulation device 3 is connected to a DC regulated power supply to provide the required excitation current, change the magnetic induction intensity, and thus change the rheological properties of the magnetorheological fluid. At the same time, a Gaussmeter probe is used to detect and check the magnetic induction intensity in the liquid carrier tank to achieve a simulation value.

[0037] In order to reproduce the contact state of the internal sealing components of the magnetorheological damper and explore the influence of magnetorheological fluid on the wear mechanism under different magnetic field conditions, the common O-ring sealing component is taken as an example, and the experiment is carried out by simulating the piston rod with pin sample 9.

[0038] Select the corresponding model of the symbol block 35 and the pin sample 9 and install and fix them, cut the O-ring in half and put it into the adapter groove 34, install the baffle 33 to fix it, adjust the friction and wear testing machine 1 to move the pin sample 9 down and against the O-ring until the pressure reaches the normal assembly condition of the magnetorheological damper, add the magnetorheological fluid to be tested in the liquid carrier tank, and adjust the magnetic induction intensity to the simulation value.

[0039] According to the working mode of the magnetorheological damper, the table 8 can be connected to the electric screw module 61 or the table 8 can be connected to the second linear guide rail 62 through the switching component 4 to perform uniform speed and variable speed motion simulation, thereby obtaining accurate experimental data.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A friction and wear test bench for a magnetorheological damper sealing element, comprising a base (7) and a friction and wear tester (1), characterized in that: A friction and wear tester (1) is fixedly mounted on the rear side of the upper surface of the base (7), a first linear guide rail (5) is fixedly mounted on the front side of the upper surface of the base (7), a table plate (8) is fixedly mounted on the upper surface of the slide table of the first linear guide rail (5), a simulation device (3) is fixedly mounted on the upper surface of the table plate (8), a U-shaped clamp (2) is fixedly mounted on the lower end of the push rod of the friction and wear tester (1), and a pin sample (9) is mounted inside the U-shaped clamp (2); The upper surface of the base (7) is provided with a driving mechanism (6) for moving the platform (8), and a switching component (4) is installed at one end of the upper surface of the platform (8).

2. The friction and wear test bench for the magnetorheological damper sealing element according to claim 1, characterized in that: The simulation device (3) comprises a cylinder body (31), an excitation coil (32) and a symbol block (35); the bottom of the cylinder body (31) is mounted on a table (8) by means of screws; the excitation coil (32) is mounted in the inner cavity of the cylinder body (31); a liquid carrier tank for containing magnetorheological fluid is arranged on the inner side of the cylinder body (31); and a symbol block (35) for fixing a sealing element is mounted at the bottom of the liquid carrier tank.

3. The friction and wear test bench for the magnetorheological damper sealing element according to claim 2, characterized in that: The top of the symbol block (35) is provided with a groove matching the shape of the pin sample (9), and the groove is provided with an adapting groove (34). Baffles (33) are installed at both ends of the upper surface of the symbol block (35), and the baffles (33) block the two ends of the adapting groove (34).

4. The friction and wear test bench for the magnetorheological damper sealing element according to claim 3, characterized in that: The pin sample (9) is connected and assembled with the U-shaped clip (2) by screws, the symbol block (35) is connected and assembled with the cylinder body (31) by screws, and the baffle (33) is connected and assembled with the symbol block (35) by screws.

5. The friction and wear test bench for the magnetorheological damper sealing element according to claim 1, characterized in that: The driving mechanism (6) comprises a second linear guide rail (62), a first servo motor (63), a turntable (64) and an electric lead screw module (61); the electric lead screw module (61) is fixedly mounted on the upper surface of the base (7) and located in front of the first linear guide rail (5); the second linear guide rail (62) and the first servo motor (63) are fixedly mounted on the upper surface of the base (7) and located in the rear of the first linear guide rail (5); the output end of the first servo motor (63) is connected to the turntable (64); one end of a transmission rod is rotatably mounted on the edge of the turntable (64); the other end of the transmission rod is rotatably assembled with the slide table of the second linear guide rail (62).

6. The friction and wear test bench for the magnetorheological damper sealing element according to claim 5, characterized in that: The switching assembly (4) includes a transmission bolt (41) and a screw hole, the second linear guide rail (62) and the top of the slide table of the electric lead screw module (61) are both provided with a blind hole (10), the table plate (8) is provided with a pair of screw holes, one of the screw holes is threaded with a transmission bolt (41), and the transmission bolt (41) is plugged and assembled with the corresponding blind hole (10).

7. The friction and wear test bench for the magnetorheological damper sealing element according to claim 5, characterized in that: The switching assembly (4) comprises a T-shaped rod (42), a second servo motor (43) and a long hole (44); the table (8) is provided with a pair of upper long holes (44); the second linear guide rail (62) and the slide table of the electric lead screw module (61) are both provided with lower long holes (11); the second servo motor (43) is fixedly mounted on the upper surface of the table (8); the output end of the second servo motor (43) is fixedly mounted with a T-shaped rod (42); the T-shaped rod (42) is inserted into the upper long hole (44) and the lower long hole (11) on the same side.

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