Testing device of magnetorheological damper

Abstract

The utility model discloses a testing device of a magneto-rheological damper, which belongs to the technical field of damper testing and comprises a driving system used for providing reciprocating motion power for a piston rod of the magneto-rheological damper, the driving system is composed of a PLC control box, a servo driver and a servo electric cylinder, the PLC control box is internally provided with a PLC controller, and the servo electric cylinder is connected with the servo driver. The servo driver is installed in the PLC control box, a tension and pressure sensor is arranged between the output end of the servo electric cylinder and the magnetorheological damper, and the two ends of the tension and pressure sensor are connected with the servo electric cylinder and the magnetorheological damper through threaded connection assemblies respectively. According to the utility model, through the arrangement of the driving system, the servo electric cylinder, the pull pressure sensor, the film pressure sensor, the acquisition card and the computer, the relationship between the acting force on the magnetorheological damper and the positive pressure between the sealing ring and the piston rod can be researched; and the relationship between the acting force borne by the magneto-rheological damper during working and the abrasion of the sealing ring is further obtained.

Description

Technical Field

[0001] This utility model relates to the field of damper testing technology, and in particular to a testing device for magnetorheological dampers. Background Technology

[0002] The measurement of the friction coefficient of the sealing ring in a damper involves two parameters: friction force and contact pressure. Friction force indicates the magnitude of the sliding resistance between the seal and the piston rod, and its value has a significant impact on the sealing effect and leakage. In dynamic seals, if the friction force is too large, it will aggravate the friction and wear of the sealing ring, leading to wear failure of the sealing ring. The existing technology lacks experimental equipment for studying the wear of the sealing ring caused by the normal pressure between the piston rod and the sealing ring of the magnetorheological damper. Therefore, an experimental device for magnetorheological dampers is proposed to solve the above-mentioned technical problems. Utility Model Content

[0003] The purpose of this invention is to solve the problems in the prior art by proposing a test device for a magnetorheological damper.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A test apparatus for a magnetorheological damper includes a drive system for providing reciprocating motion power to the piston rod of the magnetorheological damper. The drive system consists of a PLC control box, a servo driver, and a servo electric cylinder. The PLC control box contains a PLC controller, and the servo driver is installed inside the PLC control box. A tension / compression sensor is installed between the output end of the servo electric cylinder and the magnetorheological damper. The two ends of the tension / compression sensor are connected to the servo electric cylinder and the magnetorheological damper respectively through threaded connection assemblies.

[0006] Preferably, a thin-film pressure sensor is bonded between the sealing ring and the piston rod of the magnetorheological damper. The thin-film pressure sensor is connected to a data acquisition card via a wire, and the data acquisition card is connected to a computer via a square-port USB cable.

[0007] Preferably, the threaded connection assembly includes threaded posts fixedly connected to both ends of the tension / compression sensor and threaded connectors distributed at the output end of the servo electric cylinder and one end of the piston rod, wherein the threaded connectors are threadedly connected to the threaded posts.

[0008] Preferably, a DC power supply for supplying power to the control system is provided on one side of the PLC control box.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] This invention incorporates a drive system, a servo electric cylinder, a tension / compression sensor, a thin-film pressure sensor, a data acquisition card, and a computer. The drive system controls the servo electric cylinder to control the reciprocating motion of the piston rod of the magnetorheological damper. The tension / compression sensor measures the frictional force between the sealing ring and the piston rod, while the thin-film pressure sensor measures the normal pressure between them. This allows for the study of the relationship between the force acting on the magnetorheological damper and the normal pressure between the sealing ring and the piston rod, thereby revealing the relationship between the force acting on the magnetorheological damper during operation and the wear of the sealing ring. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the test apparatus in the test device for the magnetorheological damper proposed in this invention;

[0012] Figure 2 The system structure frame of the test device for the magnetorheological damper proposed in this invention. Figure 1 ;

[0013] Figure 3 The system structure frame of the test device for the magnetorheological damper proposed in this invention. Figure 2 .

[0014] In the diagram: 1. PLC control box; 2. DC power supply; 3. PLC controller; 4. Servo electric cylinder; 5. Data acquisition card; 6. Thin-film pressure sensor; 7. Computer; 8. Tension / compression sensor; 9. Threaded joint; 10. Threaded post. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0016] Reference Figure 1-3 The test apparatus for a magnetorheological damper includes a drive system for providing reciprocating motion power to the piston rod of the magnetorheological damper. The drive system consists of a PLC control box 1, a servo driver, and a servo electric cylinder 4. A PLC controller 3 is installed inside the PLC control box 1, and the servo driver is installed inside the PLC control box 1. A tension / compression sensor 8 is provided between the output end of the servo electric cylinder 4 and the magnetorheological damper. The two ends of the tension / compression sensor 8 are connected to the servo electric cylinder 4 and the magnetorheological damper respectively through threaded connection assemblies.

[0017] It should be noted that: PLC controller 3 (PLC programmable controller is Mitsubishi FX1 S-20MT-D series) sends instructions to servo drive, servo drive (servo drive model is ASD-B2-0721-B series) sends pulse instructions to servo motor in servo electric cylinder 4, servo electric cylinder 4 controls piston rod to reciprocate, tension and pressure sensor 8 can measure the tension on piston rod of magnetorheological damper, and thus indirectly measure the friction between piston rod and sealing ring;

[0018] It should be noted that the frictional force generated by the O-ring during the reciprocating motion should be obtained by subtracting the damping force of the damping gap under zero field from the coefficient measured by the S-type tension and pressure sensor 8 during the experiment. Since the left and right ends of the magnetorheological damper cylinder are symmetrically designed, the frictional force generated by the sealing rings at the left and right ends during the motion can be considered equal, i.e., F = / F sensor - F damping force.

[0019] It is worth noting that during the reciprocating motion of the servo electric cylinder 4, in order to avoid collisions caused by the servo electric cylinder 4 exceeding the mechanical limits, upper and lower limit switches and the origin must be set during use. The limits must not be exceeded during operation. The upper limit is defined as the farthest point when the piston rod is pushed out, and the lower limit is defined as the closest point to the motor side when the piston rod is retracted. Switches are set at the upper and lower limits. The switch settings should be appropriately smaller than the actual absolute mechanical limits. The upper and lower limit switches and the origin switch are magnetic switches, mainly used to detect the position of the magnetic ring on the piston rod of the electric cylinder, that is, to detect the movement stroke of the piston rod. The magnetic switch model is AL-39DF.

[0020] It is worth noting that when the magnetic ring on the piston rod approaches the magnetic switch, the magnetic switch generates an electrical signal. Therefore, the magnetic switch is connected to the input port of the PLC as a signal input to control the reciprocating stroke of the electric cylinder piston rod. Since the stroke required for the piston movement of the magnetorheological damper is too small, in order to avoid the two magnetic switches from malfunctioning due to the small installation distance, they are installed in the two grooves of the servo electric cylinder 4 respectively.

[0021] A thin-film pressure sensor 6 is bonded between the sealing ring and the piston rod of the magnetorheological damper. The thin-film pressure sensor 6 is connected to a data acquisition card 5 via a wire. The data acquisition card 5 is connected to a computer 7 via a square-port USB cable.

[0022] It should be noted that the thin-film pressure sensor 6 is a resistance strain gauge pressure sensor. During the experiment, the resistance strain gauge of the thin-film pressure sensor 6 is attached between the sealing ring and the piston rod. When the positive pressure between the O-ring and the piston rod changes, it will cause a change in the resistance of the resistance strain gauge. The thin-film pressure sensor 6 is connected to a signal amplifier and a resistance-to-voltage converter. In this way, the change in resistance is processed by the circuit and output as a voltage signal. Then, the required pressure signal can be obtained through the AD IO data acquisition card 5. After the A / D conversion of the acquisition card 5, the analog signal is converted into a digital signal. Then, the data analysis and processing unit displays the data on the computer screen and realizes the output and storage of the data.

[0023] The threaded connection assembly includes threaded posts 10 fixedly connected to both ends of the tension / compression sensor 8 and threaded connectors 9 distributed at the output end of the servo electric cylinder 4 and one end of the piston rod. The threaded connectors 9 are threadedly connected to the threaded posts 10.

[0024] A DC power supply 2 for supplying power to the control system is provided on one side of the PLC control box 1.

[0025] When this utility model is in use, the PLC controller 3 sends instructions to the servo driver, and the servo driver sends pulse instructions to the servo electric cylinder 4, so that the servo electric cylinder 4 drives the piston rod to reciprocate through the tension and pressure sensor 8. The tension and pressure sensor 8 can measure the tension force on the piston rod of the magnetorheological damper, and thus indirectly measure the friction force between the piston rod and the sealing ring. The friction force generated by the sealing ring during the movement is F = / F_sensor - F_damping force.

[0026] Meanwhile, the normal pressure between the piston rod and the sealing ring can be measured by the thin-film pressure sensor 6. When the normal pressure between the O-ring and the piston rod contact surface changes, it will cause a change in the resistance of the resistance strain gauge. The thin-film pressure sensor 6 is connected to the signal amplifier and the resistance-to-voltage converter. In this way, the change in resistance is processed by the circuit and output as a voltage signal. Then, the required pressure signal can be obtained through the ADIO data acquisition card 5. After the A / D conversion of the acquisition card 5, the analog signal is converted into a digital signal. Then, the data analysis and processing unit displays the data on the computer screen and realizes the output and storage of the data. Thus, the relationship between the force on the magnetorheological damper when it is working and the normal pressure between the piston rod and the sealing ring can be obtained. Since the normal pressure is proportional to the friction between the sealing ring and the piston rod, the relationship between the force on the magnetorheological damper when it is working and the wear of the sealing ring can be obtained.

[0027] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A test apparatus for a magnetorheological damper, comprising a drive system for providing reciprocating motion power to the piston rod of the magnetorheological damper, characterized in that, The drive system consists of a PLC control box (1), a servo driver, and a servo electric cylinder (4). The PLC control box (1) is equipped with a PLC controller (3). The servo driver is installed inside the PLC control box (1). A tension / compression sensor (8) is provided between the output end of the servo electric cylinder (4) and the magnetorheological damper. The two ends of the tension / compression sensor (8) are connected to the servo electric cylinder (4) and the magnetorheological damper respectively through threaded connection components.

2. The test apparatus for the magnetorheological damper according to claim 1, characterized in that: A thin-film pressure sensor (6) is bonded between the sealing ring and the piston rod of the magnetorheological damper. The thin-film pressure sensor (6) is connected to a data acquisition card (5) via a wire. The data acquisition card (5) is connected to a computer (7) via a square-port USB cable.

3. The test apparatus for the magnetorheological damper according to claim 1, characterized in that: The threaded connection assembly includes threaded posts (10) fixedly connected to both ends of the tension / compression sensor (8) and threaded connectors (9) distributed at the output end of the servo electric cylinder (4) and one end of the piston rod, wherein the threaded connectors (9) are threadedly connected to the threaded posts (10).

4. The test apparatus for the magnetorheological damper according to claim 1, characterized in that: A DC power supply (2) for supplying power to the control system is provided on one side of the PLC control box (1).

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