CN-118929460-B - Suspension valve group, hydro-pneumatic suspension lifting leveling system and all-ground crane

CN118929460BCN 118929460 BCN118929460 BCN 118929460BCN-118929460-B

Abstract

The invention discloses a suspension valve group, an oil-gas suspension lifting leveling system and an all-ground crane, wherein the suspension valve group comprises a working oil port A, a working oil port B, an oil return port T, an oil inlet P, an SP port used for being connected with an energy accumulator, and further comprises a suspension lifting control valve, a suspension descending control valve, a suspension quick lifting control valve, a suspension slow lifting damping hole, a suspension slow descending damping hole and a suspension quick descending control valve, wherein the suspension lifting control valve and the suspension slow lifting damping hole are arranged between the suspension valve port P and the port A in series, the suspension quick lifting control valve and the suspension slow lifting damping hole are arranged in parallel, the suspension descending control valve and the suspension slow descending damping hole are arranged between the suspension valve group port T and the port A in series, and the suspension quick descending control valve and the suspension slow descending damping hole are arranged in parallel. The invention gives consideration to one-key leveling and suspension lifting speed control, so that the vehicle can quickly lift and lower the suspension to adjust the height of the vehicle under complex road conditions, and the suspension operation efficiency and the vehicle passing performance are improved.

Inventors

ZHANG JINXING
MA YUNWANG
YU ZHONGTAI
QIN HENG
ZHANG GUOHE
ZHANG HENG
LI WEI

Assignees

徐州重型机械有限公司

Dates

Publication Date: 20260505
Application Date: 20240929

Claims (8)

1. The suspension valve group comprises a working oil port A, a working oil port B, an oil return port T, an oil inlet P and an SP port used for being connected with an energy accumulator, and is characterized by further comprising a suspension lifting control valve (1), a suspension lowering control valve (2), a suspension quick lifting control valve (4), a suspension slow lifting damping hole (5), a suspension slow lowering damping hole (6) and a suspension quick lowering control valve (7); the suspension lifting control valve (1) and the suspension slow lifting damping hole (5) are arranged between the P port and the A port of the suspension valve group in series, and the suspension fast lifting control valve (4) and the suspension slow lifting damping hole (5) are arranged in parallel; the suspension descending control valve (2) and the suspension slow descending damping hole (6) are arranged between the T port and the A port of the suspension valve group in series, and the suspension fast descending control valve (7) and the suspension slow descending damping hole (6) are arranged in parallel; When a first oil port of the suspension lifting control valve (1) is connected with the port A, a second oil port of the suspension lifting control valve (1) is connected with a first oil port of a suspension slow-lifting damping hole (5), oil ports at two ends of the suspension fast-lifting control valve (4) are respectively connected with oil ports at two ends of the suspension slow-lifting damping hole (5), a second oil port of the suspension slow-lifting damping hole (5) is connected with the port P, a first oil port of the suspension lowering control valve (2) is connected with the port A, a second oil port of the suspension lowering control valve (2) is connected with a first oil port of the suspension slow-lowering damping hole (6), oil ports at two ends of the suspension fast-lowering control valve (7) are respectively connected with oil ports at two ends of the suspension slow-lowering damping hole (6), and a second oil port of the suspension slow-lowering damping hole (6) is connected with the port T; When a second oil port of the suspension lifting control valve (1) is connected with the P port, a first oil port of the suspension lifting control valve (1) is connected with a second oil port of a suspension slow-lifting damping hole (5), oil ports at two ends of the suspension fast-lifting control valve (4) are respectively connected with oil ports at two ends of the suspension slow-lifting damping hole (5), the first oil port of the suspension slow-lifting damping hole (5) is connected with the A port, a second oil port of the suspension lowering control valve (2) is connected with the T port, the first oil port of the suspension lowering control valve (2) is connected with a second oil port of the suspension slow-lowering damping hole (6), oil ports at two ends of the suspension fast-lowering control valve (7) are respectively connected with oil ports at two ends of the suspension slow-lowering damping hole (6), and the first oil port of the suspension slow-lowering damping hole (6) is connected with the A port.
2. The suspension valve group as claimed in claim 1, further comprising a spring-rigid switching control valve (3) disposed between the port a and the port SP, the spring-rigid switching control valve (3) being configured to control on-off of the accumulator with the port a.
3. The suspension valve set of claim 1 wherein each control valve is a two-position, two-way electromagnetic directional valve.
4. A hydro-pneumatic suspension lifting leveling system, characterized by comprising four groups of suspension valve groups as claimed in any one of claims 1-3, namely a right front suspension valve group (11), a left front suspension valve group (12), a right rear suspension valve group (13) and a left rear suspension valve group (14); the hydraulic control system further comprises a right front suspension cylinder group (21) and a left front suspension cylinder group (22) which are symmetrically arranged on two sides of the frame, and a right rear suspension cylinder group (23) and a left rear suspension cylinder group (24) which are symmetrically arranged on two sides of the frame; The right front suspension valve group (11), the left front suspension valve group (12), the right rear suspension valve group (13) and the left rear suspension valve group (14) are used for controlling the telescopic actions of the right front suspension cylinder group (21), the left front suspension cylinder group (22), the right rear suspension cylinder group (23) and the left rear suspension cylinder group (24).
5. The hydro-pneumatic suspension lift leveling system of claim 4, wherein the right front suspension cylinder group (21), the left front suspension cylinder group (22), the right rear suspension cylinder group (23), and the left rear suspension cylinder group (24) are in communication with the large chambers and the small chambers of the cylinders in the same group.
6. The hydro-pneumatic suspension lift leveling system of claim 5 wherein port a of the suspension valve block is connected to a suspension cylinder block large chamber on the same side of the suspension valve block and port B of the suspension valve block is connected to a suspension cylinder block small chamber on the same side of the suspension valve block.
7. The hydro-pneumatic suspension lift leveling system of claim 4 wherein the SP ports of the four sets of suspension valve blocks are each connected with an accumulator.
8. An all-terrain crane comprising the hydro-pneumatic suspension lift leveling system of any one of claims 4-7.

Description

Suspension valve group, hydro-pneumatic suspension lifting leveling system and all-ground crane Technical Field The invention relates to the technical field of all-ground cranes, in particular to a suspension valve group, an oil-gas suspension lifting leveling system and an all-ground crane. Background The hydraulic-pneumatic suspension is a connecting device between the full-ground crane frame and the axle, takes hydraulic oil as a transmission medium, takes inert gas as an elastic medium, and consists of a suspension cylinder, a suspension valve group, an energy accumulator, a thrust rod, a flow distribution system and the like, so that impact and vibration caused by the ground are alleviated and damped, and meanwhile, force and moment are transmitted. The hydro-pneumatic suspension technology is used as a key technology of the all-ground crane, can realize the functional actions of lifting, pitching, rolling, one-key leveling of the middle position of the vehicle suspension and the like of the chassis of the all-ground crane, effectively improves the running performance of the vehicle, and can adapt the vehicle to complex and severe regional environments. As the market for all-terrain crane products increases, the user's awareness of their technology increases. In order to ensure the vibration damping performance of the hydro-pneumatic suspension and the reliability of suspension elements, the vehicle body needs to be leveled to the middle position state of the suspension through a suspension one-key leveling function before the vehicle runs on a normal road. In order to realize a one-key leveling function of a suspension, in the industry, the lifting or lowering action of a suspension cylinder is generally realized by controlling a suspension lifting or suspension lowering electromagnetic directional valve in a suspension valve group, and a neutral position detection switch or a displacement sensor of the suspension cylinder is matched as cylinder displacement feedback to further control the suspension lifting or suspension lowering electromagnetic directional valve of the suspension valve group to be powered on or powered off, so that closed-loop control of suspension cylinder displacement adjustment is realized. In order to prevent the suspension cylinder from oscillating and overshooting at the middle position due to too high expansion speed in the one-key leveling process, damping is generally designed to reduce the flow of a system before the suspension valve bank suspension lifts and drops the electromagnetic directional valve, so that the expansion speed of the suspension cylinder is reduced, the micro-motion performance of the system when the one-key leveling of the suspension is ensured, but the normal lifting efficiency of the suspension is lower, the lifting speed cannot be controlled, and the operation experience is poor. The prior patent of the utility model (201811216303.1, issued publication number CN 109441913B) discloses a suspension valve, a suspension system and an engineering vehicle, wherein the suspension valve provided by the suspension valve only needs a short-time control action (such as power supply or air supply action) to realize rigid and flexible switching of the suspension system and automatically maintain the rigid and flexible state of the suspension system, but cannot control the suspension lifting speed. Another patent of the utility model, suspension system and vehicle (application number 202223608430.0, grant publication number CN 218785909U), discloses a suspension system and vehicle, in which the number of accumulators of the access system can be adjusted, and the effective gas volume of the accumulators of the access system can be changed, so as to ensure that the vibration frequency of the suspension system can be kept within a reasonable range, and the flexibility of the suspension system can be reasonably adjusted, so that the vehicle can run more comfortably and stably, but the suspension lifting speed cannot be controlled. Disclosure of Invention Aiming at the defect that the prior art cannot achieve one-key leveling and control of suspension lifting speed, the invention provides a suspension valve group, an oil-gas suspension lifting leveling system and an all-ground crane. The technical scheme is that the suspension valve bank comprises a working oil port A, a working oil port B, an oil return port T, an oil inlet P and an SP port for connecting with an energy accumulator, and is characterized by further comprising a suspension lifting control valve, a suspension lowering control valve, a suspension quick lifting control valve, a suspension slow lifting damping hole, a suspension slow lowering damping hole and a suspension quick lowering control valve; The suspension quick-rise control valve and the suspension slow-rise damping hole are arranged in parallel; the suspension drop control valve and the suspension slow drop damping hole are connected in series