A test bench for static and dynamic performance of rotary hydraulic vibration dampers

Abstract

This invention discloses a rotary hydraulic vibration damper static and dynamic performance testing bench, comprising a support, a rotating mechanism, a test bench mechanism, a shaft clamping device, a swing angle locking device, and a piping structure. The rotating mechanism uses a servo motor as the power element and is equipped with a swing angle encoder, forming a closed-loop control with the servo motor to accurately control the swing angle between the test bench mechanism and the support. The test bench mechanism is driven to rotate by the rotating mechanism, forming a certain swing angle with the support. The shaft clamping device and the swing angle locking device are mounted on the support and are hydraulically driven, forming a three-point lock on the test bench mechanism. Through this method, the invention has a simple structure, controls the swing angle with precision, ensures angle consistency during multiple tests, is suitable for testing vibration dampers at different installation angles, can flexibly adapt to vibration dampers of different working lengths, and avoids oil pipe tangling, winding, and wear during rotation, thus improving testing efficiency and accuracy.

Description

Technical Field

[0001] This invention relates to the field of hydraulic vibration damper testing technology, and in particular to a rotary hydraulic vibration damper static and dynamic performance testing bench. Background Technology

[0002] After the hydraulic shock absorber is assembled, its damping performance needs to be tested on a test bench. A conventional shock absorber performance test bench includes a base and a frame set on the base. A hydraulic actuator is set at one end of the frame and a force sensor is set at the other end. The shock absorber is connected to the actuator and the force sensor respectively through tooling. During the test, the excitation is input through the actuator, the force sensor collects the corresponding signal, and the damping characteristics of the shock absorber are obtained after the data is processed by software.

[0003] In existing technologies, the rotation of the test bench frame is driven by a hydraulic cylinder, and the rotation is controlled by a knob on the control box manually. During the swinging process, the frame is prone to overshoot, requiring repeated adjustments to achieve the desired angle. The swing angle control accuracy is poor, and the swing angle consistency is poor across multiple tests. Traditional test benches use a double-column frame, which has poor frame rigidity and stability. The crossbeam movement is driven by a hydraulic cylinder, and the movement is controlled by a knob on the control box manually. The crossbeam movement involves significant impact and is prone to overshoot, resulting in poor position control accuracy. To avoid interference during frame rotation, traditional test benches use flexible hoses connecting the hydraulic actuators, requiring sufficient hose slack. When the frame rotates, the entire hose rotates with the frame, leading to problems such as knotting, tangling, and wear, and also resulting in poor aesthetics. Traditional test benches lock the rotating frame by clamping only the rotating spindle, or by adding a clamping cylinder on the rotating arc. These locking methods result in significant frame vibration during testing at any angle, leading to angle deviations, low stability, and low test accuracy.

[0004] Based on the above defects and shortcomings, it is necessary to improve the existing technology and design a rotary hydraulic vibration damper static and dynamic performance test bench. Summary of the Invention

[0005] The main technical problem solved by this invention is to provide a rotary hydraulic vibration damper static and dynamic performance testing bench, which solves the problems of poor swing angle control accuracy and poor angle consistency during multiple tests in existing hydraulic vibration damper testing benches; solves the problems of poor frame stiffness and insufficient stability; solves the problems of large impact during crossbeam movement and poor position control accuracy; solves the problems of easy knotting, tangling, wear and poor aesthetics of oil pipes when the frame rotates; and solves the problems of large frame vibration and easy angle deviation during arbitrary angle testing.

[0006] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide a rotary hydraulic vibration damper static and dynamic performance testing bench, the rotary hydraulic vibration damper static and dynamic performance testing bench comprising:

[0007] Support;

[0008] A rotating mechanism is installed on the support. The rotating mechanism uses a servo motor as a power element and is equipped with a swing angle encoder to form a closed-loop control with the servo motor, so as to accurately control the swing angle between the experimental platform mechanism and the support.

[0009] The experimental platform mechanism adopts a four-column structure and a movable upper crossbeam driven by a servo motor. The upper crossbeam has high precision in controlling its movement position and can flexibly adapt to vibration dampers of different working lengths, thereby improving testing efficiency. It is driven to rotate by the rotating mechanism and forms a certain swing angle with the support.

[0010] The rotating shaft clamping device and the swing angle locking device are set on the support and are hydraulically driven to form a three-point locking of the experimental platform mechanism, so that the experimental platform mechanism can be stably stopped at any swing angle position for testing.

[0011] The pipeline structure adopts a pipeline connection method with a rotary joint, which allows the oil pipes at both ends of the rotary joint to rotate freely.

[0012] Preferably, the shaft clamping device includes a shaft clamping beam, a locking nut, a locking screw, a disc spring, and a hydraulic cylinder. The shaft clamping beam is fixedly installed on the upright plate of the support. A notch is opened at the lower part of the shaft clamping beam. The notch is locked by the locking nut and the locking screw. A disc spring is fitted on the locking nut. A hydraulic cylinder is installed at the lower part of the shaft clamping beam. The piston of the hydraulic cylinder is opposite to the locking nut. When the piston extends, it compresses the disc spring, and the notch at the lower part of the shaft clamping beam is restored.

[0013] Preferably, the swing angle locking device includes an arc track, a locking cylinder, and a T-block. The arc track is fixedly installed on the upright plate of the support. The arc track is centered on the rotation axis of the rotating mechanism. Two locking cylinders are installed on the lower crossbeam of the experimental platform mechanism. A T-block is installed on the piston rod of the locking cylinder. The T-block is located in the groove of the arc track. When the locking cylinder contracts, it drives the T-block to press the arc track, thereby achieving self-locking.

[0014] Preferably, the experimental platform mechanism is provided with a transmission mechanism for adjusting the position of the upper crossbeam. The transmission mechanism includes a motor mounted on the upper crossbeam, a lead screw nut driven by the motor and rotated through a chain transmission, and a lifting lead screw mounted on the top of the column. The lead screw nut is sleeved on the lifting lead screw and is rotatably mounted on the upper crossbeam through a bearing seat. The motor drives the chain to rotate the lead screw nut around the lifting lead screw, thereby causing the upper crossbeam to move up and down on the column. A hydraulic actuator is mounted on the upper crossbeam.

[0015] Preferably, the upper crossbeam and the rotating shaft of the rotating mechanism are connected by a key.

[0016] Preferably, the pipeline structure includes a rotary joint, an inlet hose and a return hose respectively connected to the upper connector bodies on both sides of the rotary joint, and an inlet hard pipe and a return hard pipe connected to the lower connector body in the middle of the rotary joint. The inlet hose and the return hose are connected to an oil pump, and the inlet hard pipe and the return hard pipe are connected to a hydraulic actuator.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] Design a closed-loop control system driven by a servo motor to quickly and accurately control the swing angle between the experimental platform mechanism and the support, ensuring the consistency of the swing angle during multiple tests;

[0019] A hydraulically driven shaft clamping device is installed on the shaft clamping beam, which, together with two sets of hydraulically driven swing angle locking devices at the bottom of the support, locks the experimental platform mechanism, forming a three-point locking method. This allows the experimental platform mechanism to be stably stopped at any swing angle position and tested, reducing the impact of angle deviation.

[0020] The experimental platform adopts a four-column structure, which can enhance the overall rigidity, reduce elastic deformation, and reduce the impact on the dynamic testing of the vibration damper.

[0021] The movable upper crossbeam is driven by a servo motor, which has high precision in controlling the movement position of the upper crossbeam and can be flexibly adapted to vibration dampers of different working lengths, thereby improving testing efficiency.

[0022] The use of a pipe connection method with a rotary joint ensures that the bottom oil pipe does not rotate with the experimental platform mechanism when it rotates, avoiding problems such as oil pipe tangling, knotting and wear, and improving the safety and aesthetics of the experimental platform.

[0023] The rotating spindle and the upper beam of the frame are connected by a key, which ensures stable and efficient torque transmission without impact. The test bench is characterized by its simple structure and reliable operation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure from another perspective of an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the rotating mechanism in an embodiment of the present invention.

[0027] Figure 4 This is a cross-sectional view of the shaft locking device in an embodiment of the present invention.

[0028] Figure 5 This is a partial cross-sectional view of the swing angle locking device in an embodiment of the present invention.

[0029] Figure 6 This is a side view of an embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram of the mounting structure of the rotating spindle in an embodiment of the present invention.

[0031] Figure 8 This is a schematic diagram of the pipeline structure in an embodiment of the present invention.

[0032] Figure 9 This is a cross-sectional view of the rotary joint in an embodiment of the present invention.

[0033] Among them, 1 is the support, and 101 is the vertical plate;

[0034] 2. Rotating mechanism; 201. Servo motor; 202. Reducer; 203. Coupling; 204. Synchronous belt; 205. Swing angle encoder; 206. Rotating spindle.

[0035] 3. Experimental bench mechanism, 301. Lower crossbeam, 302. Column, 303. Upper crossbeam, 304. Hydraulic cylinder, 305. Motor, 306. Chain, 307. Screw nut, 308. Lifting screw, 309. Hydraulic actuator, 310. Key;

[0036] 4. Shaft clamping device; 40. Shaft clamping beam; 401. Locking nut; 402. Locking screw; 403. Butterfly spring; 404. Oil cylinder; 405. Piston.

[0037] 5. Sway angle locking device, 501. Arc track, 502. Locking cylinder, 502a. Piston rod, 502b. Lower chamber, 502c. Upper chamber, 503. T-block;

[0038] 6. Piping structure, 601. Rotary joint, 6a. Lower joint body, 6b. Upper joint body, 6c. Deep groove ball bearing, 6d. Connection port of lower joint body, 6e. Hole, 6f. Upper oil pipe, 6g. Seal, 602. Oil inlet hose, 603. Oil return hose, 604. Oil inlet rigid pipe, 605. Oil return rigid pipe. Detailed Implementation

[0039] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0040] Please see Figures 1 to 9 The embodiments of the present invention include:

[0041] A rotary hydraulic vibration damper static and dynamic performance testing bench includes a support 1, a rotation mechanism 2, a test bench mechanism 3, a shaft clamping device 4, a swing angle locking device 5, and a pipeline structure 6.

[0042] like Figure 3 As shown, the rotating mechanism 2 includes a servo motor 201, a reducer 202, a coupling 203, a synchronous belt 204, a swing angle encoder 205, and a rotating spindle 206. The servo motor 201 drives the reducer 202 and drives the rotating spindle 206 to rotate through the coupling 203. The swing angle encoder 205 obtains the rotation state of the rotating spindle 206 in real time through the synchronous belt 204 and feeds the signal back to the servo motor 201 to form a closed-loop control, ultimately achieving precise swing angle control. The rotating mechanism controlled by the servo motor 201 has highly reliable position accuracy, high torque value, and very good speed regulation.

[0043] like Figure 4 As shown, the rotating shaft clamping beam 40 is fixedly installed on the vertical plate 101 of the support 1. A rotating shaft clamping device 4 is installed on the rotating shaft clamping beam 40. The lower part of the rotating shaft clamping beam 40 has a notch, which is locked by a locking nut 401 and a locking screw 402. A butterfly spring 403 is fitted on the locking nut 401. By adjusting the elastic deformation of the butterfly spring 403, the corresponding elastic force is transmitted to the rotating shaft clamping beam 40. After receiving the elastic force, the notch contracts, thereby clamping the rotating spindle 206. A hydraulic cylinder 404 is installed at the lower part of the rotating shaft clamping beam 40. The piston 405 is opposite to the locking nut 401. When high-pressure oil enters the interior of the cylinder 404, it pushes the piston 405 forward. Under the action of the piston 405, the disc spring 403 is further compressed, and the locking nut 401 and the locking screw 402 move forward as a whole. The lower notch of the rotating shaft clamping beam 40 is restored, and the rotating spindle 206 is released. With this hydraulically driven tightening and loosening method, when no high-pressure oil enters the cylinder, the rotating spindle 206 remains in a clamped state due to the action of the disc spring 403, ensuring the safety of the test bench.

[0044] Two sets of hydraulically driven swing-angle locking devices 5 are designed at the lower part of the experimental platform mechanism 3. An arc track 501 is installed on the upright plate 101 of the support 1, with the arc track 501 centered on the rotating main shaft 206. Two locking cylinders 502 are installed on the lower crossbeam 301 of the experimental platform mechanism 3. A T-block 503 is installed on the piston rod 502a of the locking cylinder 502, and the T-block 503 is located in the groove of the arc track 501. The lower crossbeam 301 of the experimental platform mechanism 3 is locked onto the arc track 501. When oil enters the lower chamber 5 of the locking cylinder 502... After 02b, the piston rod 502a is pushed backward, and the T-block 503 connected to the piston rod 502a presses against the groove of the arc track 501, thereby locking the lower crossbeam 301. When the oil enters the upper chamber 502c of the locking cylinder 502, the piston rod 502a moves forward, and the T-block 503 is released, allowing the lower crossbeam 301 to slide freely on the groove of the arc track 501. A three-point locking method is formed by the rotating shaft locking device and the two swing angle locking devices 5, which can firmly lock the experimental platform mechanism 3 onto the support 1. Figure 5 As shown.

[0045] The experimental platform mechanism 3 adopts a single-sided double-column 302 design. The lower crossbeam 301 and upper crossbeam 303 of the experimental platform mechanism 3 are connected by the double columns 302 on both sides, which enhances the rigidity and stability of the test platform and prevents the frame from shaking or deforming during the test. In addition, each column 302 is equipped with a set of column locking hydraulic cylinders 304, which facilitates the quick locking of the moving upper crossbeam 303 onto the column 302 by hydraulic drive when adjusting the working length of the test platform, thereby improving the testing efficiency. The experimental platform mechanism 3 is equipped with a transmission mechanism for adjusting the position of the upper crossbeam 303, and the transmission mechanism includes... A motor 305 is mounted on the upper crossbeam 303; a lead screw nut 307, driven by the motor 305 and transmitted through a chain 306, rotates; and a lifting screw 308 is mounted on the top of the column 302. The lead screw nut 307 is fitted onto the lifting screw 308. The lead screw nut 307 is rotatably mounted on the upper crossbeam 303 via a bearing seat. The motor 305 drives the chain 306 to rotate the lead screw nut 307 around the lifting screw 308, thereby allowing the upper crossbeam 303 to move up and down on the column 302. A hydraulic actuator 309 is mounted on the upper crossbeam 303. Figure 6 As shown.

[0046] like Figure 7 As shown, the rotating spindle 206 and the upper crossbeam 303 are connected by a key 310, which can effectively fix the circumferential direction and transmit torque, reducing the vibration and impact of the structure during the rotation of the experimental platform mechanism 3. The key connection method makes the test platform simple in structure, easy to disassemble and assemble, and reliable in operation.

[0047] like Figure 8As shown, the pipeline structure 6 includes a rotary joint 601, an inlet hose 602 and a return hose 603 respectively connected to the upper connector bodies on both sides of the rotary joint 601, and an inlet hard pipe 604 and a return hard pipe 605 connected to the lower connector body in the middle of the rotary joint 601. The inlet hose 602 and the return hose 603 are connected to an oil pump, and the inlet hard pipe 604 and the return hard pipe 605 are connected to a hydraulic actuator 309. This allows the oil pipes at both ends of the rotary joint to rotate freely. When the test bench mechanism 3 rotates, the inlet hard pipe 604 and the return hard pipe 605 rotate with it, while the inlet hose 602 and the return hose 603 do not rotate with it, thus avoiding pipe tangling and knotting, improving the safety of the test bench, and making the test bench more concise and aesthetically pleasing.

[0048] like Figure 9 As shown, the lower connector body 6a of the rotary joint 601 is fixed, and the upper connector body 6b is installed at the end of the lower connector body 6a through a deep groove ball bearing 6c and can rotate around the axis of the lower connector body 6a. When the oil enters the rotary joint through the connection port 6d of the lower connector body, it flows into the interior of the upper connector body 6b through the circumferentially distributed holes 6e in the inner cavity, and finally flows into the upper oil pipe 6f. Under the action of the sealing element 6g, the oil is prevented from leaking outward, thereby realizing the free rotation of the oil pipes at both ends of the rotary joint.

[0049] This invention relates to a rotary hydraulic vibration damper static and dynamic performance testing bench. The vibration damper testing bench has good swing angle control accuracy, ensuring angle consistency during multiple tests. It is suitable for testing vibration dampers at different installation angles, enhancing overall rigidity and structural stability. The upper crossbeam moves to mitigate impacts, and it can flexibly adapt to vibration dampers of different working lengths. During rotation, it avoids oil pipe tangling, winding, and wear, and can adapt to the testing needs of different types of vibration dampers, improving testing efficiency and accuracy.

[0050] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A test bench for testing static and dynamic performance of a rotary oil damper, characterized in that: The utility model relates to a test bench for shock absorber, which comprises: a support (1); a rotating mechanism (2) installed on the support (1), the rotating mechanism (2) adopts a servo motor (201) as a power element, the rotating mechanism (2) is provided with a swing angle encoder (205) and forms a closed loop control with the servo motor (201) to accurately control the swing angle between a test bench mechanism (3) and the support (1); the test bench mechanism (3) adopts a four-column (302) structure, a movable upper cross beam (303) driven by a servo motor, the movable upper cross beam has high moving position control precision, is suitable for shock absorbers with different working lengths, improves test efficiency, is driven to rotate by the rotating mechanism (2) and forms a certain swing angle with the support (1); a rotating shaft clamping device (4) and a swing angle locking device (5) arranged on the support (1) are driven by a hydraulic pressure, three-point locking is formed on the test bench mechanism (3), and the test bench mechanism (3) is stably parked at an arbitrary swing angle position for testing; a pipeline structure (6) adopts a pipeline connection mode with a rotating joint to realize the free rotation of oil pipes at the upper and lower ends of the rotating joint; the pipeline structure (6) comprises a rotating joint (601), an oil inlet hose (602) and an oil return hose (603) connected with upper joint bodies on the two sides of the rotating joint (601) and an oil inlet hard pipe (604) and an oil return hard pipe (605) connected with a lower joint body in the middle of the rotating joint (601), the oil inlet hose (602) and the oil return hose (603) are connected with an oil pump, and the oil inlet hard pipe (604) and the oil return hard pipe (605) are connected to a hydraulic actuator (309).

2. The static and dynamic performance test bench for rotary oil hydraulic shock absorber according to claim 1, characterized in that: The rotating shaft clamping device (4) comprises a rotating shaft clamping cross beam (40), a locking nut (401), a locking screw (402), a butterfly spring (403) and an oil cylinder (404), the rotating shaft clamping cross beam (40) is fixedly installed on a vertical plate (101) of the support (1), a notch is formed in the lower part of the rotating shaft clamping cross beam (40), the notch is locked by the locking nut (401) and the locking screw (402), the locking nut (401) is sleeved with the butterfly spring (403), the oil cylinder (404) is installed at the lower part of the rotating shaft clamping cross beam (40), the piston of the oil cylinder (404) is opposite to the locking nut (401), the piston (405) extends to compress the butterfly spring (403), and the notch at the lower part of the rotating shaft clamping cross beam (40) restores.

3. The static and dynamic performance test bench for a rotary oil hydraulic shock absorber according to claim 1, characterized in that: The swing angle locking device (5) comprises a circular arc track (501), a locking oil cylinder (502) and a T-shaped block (503), the circular arc track (501) is fixedly installed on the vertical plate (101) of the support (1), the circular arc track (501) is centered on the rotating main shaft (206) of the rotating mechanism (2), two locking oil cylinders (502) are installed on a lower cross beam (301) of the test bench mechanism (3), the piston rod of the locking oil cylinder (502) is provided with the T-shaped block (503), the T-shaped block (503) is located in a sliding groove of the circular arc track (501), the locking oil cylinder (502) is contracted to drive the T-shaped block (503) to compress the circular arc track (501), and self-locking is realized.

4. The static and dynamic performance test bench for rotary oil hydraulic shock absorber according to claim 1, characterized in that: The experimental bench mechanism (3) is provided with a transmission mechanism for adjusting the position of the upper cross beam (303), the transmission mechanism comprises a motor (305) installed on the upper cross beam (303), a screw nut (307) driven by the motor (305) and rotated through a chain (306), a lifting lead screw (308) installed on the top of the column (302), the screw nut (307) is sleeved on the lifting lead screw (308), and the screw nut (307) is rotatably installed on the upper cross beam (303) through a bearing seat.

5. The static and dynamic performance test bench for rotary oil hydraulic shock absorber according to claim 4, characterized in that: The upper cross beam (303) and the rotating main shaft (206) of the rotating mechanism (2) are connected through a key (310).

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