Suspension valve group, oil-gas suspension lifting leveling system and all-terrain crane

Abstract

The application discloses a suspension valve group, an oil-gas suspension lifting and leveling system and an all-terrain crane. The suspension valve group comprises a working oil port A, a working oil port B, a return oil port T, an oil inlet port P and an SP port for being connected with an accumulator, and further comprises a suspension lifting control valve, a suspension lowering control valve, a suspension rapid lifting control valve, a suspension slow lifting damping hole, a suspension slow lowering damping hole and a suspension rapid lowering control valve. The suspension lifting control valve and the suspension slow lifting damping hole are connected in series between the P port and the A port of the suspension valve group, and the suspension rapid lifting control valve is connected in parallel with the suspension slow lifting damping hole. The suspension lowering control valve and the suspension slow lowering damping hole are connected in series between the T port and the A port of the suspension valve group, and the suspension rapid lowering control valve is connected in parallel with the suspension slow lowering damping hole. The application considers one-key leveling and control of suspension lifting and lowering speed, so that the vehicle can quickly lift and lower the suspension to adjust the vehicle body height under complex road conditions, and the suspension operation efficiency and the vehicle passing performance are improved.

Description

Technical Field

[0001] This invention relates to the field of all-terrain crane technology, and in particular to a suspension valve assembly, a hydropneumatic suspension lifting and leveling system, and an all-terrain crane. Background Technology

[0002] Hydro-pneumatic suspension is a connection device between the chassis and axles of an all-terrain crane, using hydraulic oil as the transmission medium and inert gas as the elastic medium. It consists of suspension cylinders, suspension valve assemblies, accumulators, thrust rods, and a distribution system. It mitigates and attenuates impacts and vibrations caused by the ground, while simultaneously transmitting force and torque. As a key technology for all-terrain cranes, hydro-pneumatic suspension technology enables the crane chassis to perform lifting, pitching, tilting, and one-button leveling of the suspension, effectively improving vehicle handling performance and allowing the vehicle to adapt to complex and harsh terrain environments.

[0003] As the market for all-terrain cranes grows, users' familiarity with the technology is also increasing. To ensure the vibration damping performance and reliability of the hydropneumatic suspension, the vehicle body needs to be leveled to the suspension neutral position using the one-button suspension leveling function before normal road driving. To achieve the one-button suspension leveling function, the industry generally controls the suspension cylinder's lifting or lowering action by controlling the suspension lifting or lowering solenoid valve in the suspension valve group. This is combined with the suspension cylinder's neutral position detection switch or displacement sensor as cylinder displacement feedback, which in turn controls the energization or de-energization of the suspension lifting or lowering solenoid valve in the suspension valve group, thus achieving closed-loop control of the suspension cylinder displacement adjustment. To prevent the suspension cylinder from oscillating and overshooting in the neutral position due to excessively fast extension and retraction speed during one-key leveling, damping is usually designed in front of the suspension lifting and lowering solenoid valves in the suspension valve group to reduce system flow. This reduces the extension and retraction speed of the suspension cylinder and ensures the micro-motion performance of the system during one-key suspension leveling. However, the normal lifting and lowering efficiency of the suspension is low, and the lifting and lowering speed cannot be controlled, resulting in a poor user experience.

[0004] The existing invention patent "Suspension Valve, Suspension System and Engineering Vehicle" (Application No. 201811216303.1, Authorization Announcement No. CN 109441913 B) discloses a suspension valve, suspension system and engineering vehicle. The suspension valve requires only a short-term control action (e.g., energization or pneumatic supply) to achieve the switching between stiffness and flexibility of the suspension system and automatically maintain the stiffness or flexibility state of the suspension system, but it cannot control the suspension lifting speed. Another utility model patent "Suspension System and Vehicle" (Application No. 202223608430.0, Authorization Announcement No. CN 218785909 U) discloses a suspension system and vehicle. In this system and vehicle, the number of accumulators connected to the system is adjustable, and the effective gas volume of the accumulators can be changed, thereby ensuring that the vibration frequency of the suspension system remains within a reasonable range and that the flexibility of the suspension system is reasonably adjusted, resulting in a more comfortable and stable vehicle ride. However, it also cannot control the suspension lifting speed. Summary of the Invention

[0005] Purpose of the invention: To address the shortcomings of existing technologies that cannot simultaneously achieve one-click leveling and control of suspension lifting speed, this invention provides a suspension valve group, a hydropneumatic suspension lifting and leveling system, and an all-terrain crane.

[0006] Technical solution: To solve the above problems, the present invention adopts a suspension valve assembly, including a working oil port A, a working oil port B, a return oil port T, an inlet oil port P, and an SP port for connecting to an accumulator. The invention is characterized by further including a suspension lift control valve, a suspension drop control valve, a suspension fast lift control valve, a suspension slow lift damping orifice, a suspension slow drop damping orifice, and a suspension fast drop control valve.

[0007] The suspension lift control valve and the suspension slow lift damping orifice are connected in series between the P port and the A port of the suspension valve group, and the suspension fast lift control valve and the suspension slow lift damping orifice are connected in parallel.

[0008] The suspension drop control valve and the suspension slow drop damping orifice are connected in series between the T port and the A port of the suspension valve group, and the suspension fast drop control valve and the suspension slow drop damping orifice are connected in parallel.

[0009] Furthermore, the first oil port of the suspension lift control valve is connected to port A, the second oil port of the suspension lift control valve is connected to the first oil port of the suspension slow lift damping hole, the two oil ports of the suspension fast lift control valve are respectively connected to the two oil ports of the suspension slow lift damping hole, and the second oil port of the suspension slow lift damping hole is connected to port P.

[0010] The first port of the suspension drop control valve is connected to port A, the second port of the suspension drop control valve is connected to the first port of the suspension slow drop damping hole, the two ports of the suspension fast drop control valve are respectively connected to the two ports of the suspension slow drop damping hole, and the second port of the suspension slow drop damping hole is connected to port T.

[0011] Furthermore, the second oil port of the suspension lift control valve is connected to port P, the first oil port of the suspension lift control valve is connected to the second oil port of the suspension slow lift damping hole, the two oil ports of the suspension fast lift control valve are respectively connected to the two oil ports of the suspension slow lift damping hole, and the first oil port of the suspension slow lift damping hole is connected to port A.

[0012] The second port of the suspension drop control valve is connected to port T, the first port of the suspension drop control valve is connected to the second port of the suspension slow drop damping hole, the two ports of the suspension fast drop control valve are respectively connected to the two ports of the suspension slow drop damping hole, and the first port of the suspension slow drop damping hole is connected to port A.

[0013] Furthermore, it also includes a spring-loaded rigidity switching control valve disposed between port A and port SP, the spring-loaded rigidity switching control valve being used to control the on / off state of the accumulator and port A.

[0014] Furthermore, each control valve is a two-position, two-way solenoid directional valve.

[0015] The present invention also provides the aforementioned oil-gas suspension lifting and leveling system, comprising four sets of the above-mentioned suspension valve groups, namely, the right front suspension valve group, the left front suspension valve group, the right rear suspension valve group, and the left rear suspension valve group;

[0016] It also includes the right front suspension cylinder group and the left front suspension cylinder group symmetrically arranged on both sides of the frame, as well as the right rear suspension cylinder group and the left rear suspension cylinder group symmetrically arranged on both sides of the frame.

[0017] The right front suspension valve group, left front suspension valve group, right rear suspension valve group, and left rear suspension valve group are used to control the extension and retraction of the right front suspension cylinder group, left front suspension cylinder group, right rear suspension cylinder group, and left rear suspension cylinder group.

[0018] Furthermore, the large chambers of the cylinders in the right front suspension cylinder group, left front suspension cylinder group, right rear suspension cylinder group, and left rear suspension cylinder group are interconnected, and the small chambers are also interconnected.

[0019] Furthermore, the A port of the suspension valve assembly is connected to the large cavity of the suspension cylinder assembly located on the same side of the suspension valve assembly, and the A port of the suspension valve assembly is connected to the small cavity of the suspension cylinder assembly located on the same side of the suspension valve assembly.

[0020] Furthermore, the SP ports of all four suspension valve groups are connected to accumulators.

[0021] The present invention also provides an all-terrain crane including the above-described oil-gas suspension lifting and leveling system.

[0022] Beneficial effects: Compared with the prior art, the significant advantage of this invention is that it combines one-click leveling and control of suspension lifting speed, enabling the vehicle to quickly raise and lower the suspension to adjust the vehicle height under complex road conditions, improving suspension operation efficiency and vehicle passability; at the same time, it can quickly realize the one-click suspension leveling function before the vehicle is driven on normal highways, improving the efficiency of one-click suspension leveling and micro-motion performance, and enhancing the user's suspension operation experience. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the first type of suspension valve assembly of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall structure of the second type of suspension valve assembly of the present invention;

[0025] Figure 3 This is a schematic diagram of the overall structure of the oil-gas suspension lifting and leveling system of the present invention. Detailed Implementation

[0026] like Figure 1 As shown, a suspension valve assembly in this embodiment includes a two-position two-way solenoid valve 1 for suspension lift, a two-position two-way solenoid valve 2 for suspension drop, a two-position two-way solenoid valve 3 for spring stiffness switching, a two-position two-way solenoid valve 4 for suspension rapid lift, a two-position two-way solenoid valve 5 for suspension slow lift, a two-position two-way damping orifice 6 for suspension slow drop, and a two-position two-way solenoid valve 7 for suspension rapid drop. The suspension valve assembly also has a working oil port A, a working oil port B, a return oil port T, an inlet oil port P, and an SP port for connecting to an accumulator. The two slow-speed suspension lift damping orifices 5 and 6 are through holes with very small diameters, allowing for a small flow of fluid, and are used to achieve slow lifting and lowering of the suspension.

[0027] The first type of suspension valve assembly structure is as follows: Figure 1As shown, the first port of the suspension lift two-position two-way solenoid valve 1 is connected to port A, and the second port of the suspension lift two-position two-way solenoid valve 1 is connected to the first port of the suspension slow-speed lift damping orifice 5. The suspension lift two-position two-way solenoid valve 1 is used to control the connection and disconnection between the working port A and the pressure oil. The two ports of the suspension fast-lift two-position two-way solenoid valve 4 are respectively connected to the two ports of the suspension slow-speed lift damping orifice 5. The suspension fast-lift two-position two-way solenoid valve 4 is used to realize the rapid lifting action of the suspension and improve the lifting efficiency of the suspension. Specifically, by connecting the suspension fast-lift two-position two-way solenoid valve 4 and the suspension lift two-position two-way solenoid valve 1, the working port A is connected to the oil inlet P. Pressure oil flows into port A from the two-position two-way solenoid valve 4 and the suspension slow-speed lift damping orifice 5 at the same time. The main flow enters through the two-position two-way solenoid valve 4, increasing the oil volume entering port A and realizing the rapid lifting of the suspension. The second port of the slow-lift damping orifice 5 is connected to port P to achieve slow-speed suspension rise, improving the one-button leveling and micro-motion performance of the suspension. Specifically, only the two-position two-way solenoid valve 1 is activated, while the two-position two-way solenoid valve 4 is deactivated. Pressure oil enters port A only through the slow-lift damping orifice 5, resulting in a slow oil inflow rate and thus slow suspension rise. The first port of the two-position two-way solenoid valve 2 is connected to port A, and the second port is connected to the first port of the slow-lift damping orifice 6. The two-position two-way solenoid valve 2 controls the connection between the working port A and the return port. The two ports of the fast-lift two-way solenoid valve 7 are connected to the two ports of the slow-lift damping orifice 6, respectively. The fast-lift two-way solenoid valve 7 is used for rapid suspension descent, improving suspension descent efficiency. The second port of the suspension slow-speed damping orifice 6 is connected to port T. The suspension slow-speed damping orifice 6 is used to realize the slow-speed descent of the suspension, improving the one-button leveling and micro-motion performance of the suspension. The two-position two-way solenoid directional valve 3 for spring stiffness switching is located between port A and port SP to control the on / off state of the accumulator and port A.

[0028] The second type of suspension valve assembly structure is as follows: Figure 2As shown, the second port of the suspension lift two-position two-way solenoid valve 1 is connected to port P, and the first port of the suspension lift two-position two-way solenoid valve 1 is connected to the second port of the suspension slow-speed lift damping orifice 5. The two ports of the suspension fast-speed lift two-position two-way solenoid valve 4 are respectively connected to the two ports of the suspension slow-speed lift damping orifice 5, and the first port of the suspension slow-speed lift damping orifice 5 is connected to port A. The second port of the suspension lowering two-position two-way solenoid valve 2 is connected to port T, and the first port of the suspension lowering two-position two-way solenoid valve 2 is connected to the second port of the suspension slow-speed lowering damping orifice 6. The two ports of the suspension fast-speed lowering two-position two-way solenoid valve 7 are respectively connected to the two ports of the suspension slow-speed lowering damping orifice 6, and the first port of the suspension slow-speed lowering damping orifice 6 is connected to port A. The spring stiffness switching two-position two-way solenoid valve 3 is located between port A and port SP to control the on / off state of the accumulator and port A.

[0029] like Figure 3 As shown, the present invention also provides a hydropneumatic suspension lifting and leveling system, including four suspension valve groups: 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. It also includes a right front suspension cylinder group 21 and a left front suspension cylinder group 22 symmetrically arranged on both sides of the vehicle frame, and a right rear suspension cylinder group 23 and a left rear suspension cylinder group 24 symmetrically arranged on both sides of the vehicle frame. Each suspension cylinder group includes multiple cylinders, each cylinder having its own displacement sensor. The large chambers of the cylinders within the same group are interconnected, and the small chambers are also interconnected.

[0030] The right front suspension valve group 11, left front suspension valve group 12, right rear suspension valve group 13, and left rear suspension valve group 14 are used to control the extension and retraction of the right front suspension cylinder group 21, left front suspension cylinder group 22, right rear suspension cylinder group 23, and left rear suspension cylinder group 24. Port A of the suspension valve group is connected to the large chamber of the suspension cylinder group located on the same side as the valve group, and port B of the suspension valve group is connected to the small chamber of the suspension cylinder group located on the same side. Accumulators (31, 32, 33, 34) are connected to the SP ports of all four suspension valve groups. When the two-position, two-way solenoid valve 3 for spring-rigidity switching is energized and open, the accumulator is connected to the suspension cylinder, and the system operates in an elastic state with good vibration damping effect. When the two-position, two-way solenoid valve 3 for spring-rigidity switching is de-energized, the accumulator is not connected to the suspension cylinder, and the system operates in a rigid state.

[0031] The control strategy of the hydropneumatic suspension lifting and leveling system of this invention is as follows:

[0032] (1) Suspension lifting control strategy: control the suspension lifting two-position two-way solenoid valve 1, the suspension rapid lifting two-position two-way solenoid valve 4, and the spring rigidity switching two-position two-way solenoid valve 3 to be energized and turned on, so that the large chamber, small chamber, and accumulator of the corresponding suspension cylinder group are simultaneously connected to the pressure oil, and the system is in an elastic working state to realize the rapid lifting action of the suspension.

[0033] (2) Suspension descent control strategy: control the suspension descent two-position two-way solenoid valve 2, the suspension rapid descent two-position two-way solenoid valve 7, and the spring stiffness switching two-position two-way solenoid valve 3 to be energized and turned on, so that the large chamber, small chamber, and accumulator of the corresponding suspension cylinder group are simultaneously connected to the return oil, and the system is in a flexible working state to realize the rapid descent action of the suspension.

[0034] (3) Suspension one-key leveling control strategy: In the suspension leveling state, the displacement of the suspension cylinder is L±ΔL, where L is the displacement reference set by the suspension cylinder and ΔL is the displacement deviation in the suspension cylinder in the mid-position leveling state.

[0035] When the suspension cylinder displacement is less than L - ΔL, the suspension lift two-position two-way solenoid valve 1, the suspension rapid lift two-position two-way solenoid valve 4, and the spring stiffness switching two-position two-way solenoid valve 3 are first energized and turned on, enabling the suspension to rise rapidly. When the suspension cylinder displacement is detected to be L ± ΔL for the first time, the suspension lift two-position two-way solenoid valve 1 and the suspension rapid lift two-position two-way solenoid valve 4 are de-energized. Due to the response delay of the solenoid valves and the inertia of the cylinder movement, the suspension cylinder will continue to rise, resulting in a cylinder displacement greater than L + ΔL. Then, the suspension lowering two-position two-way solenoid valve 2 and the spring stiffness switching two-position two-way solenoid valve 3 are energized and turned on, so that the large chamber, small chamber and accumulator of the suspension cylinder are simultaneously connected to the return oil through the suspension slow-speed damping hole 6, realizing the slow-speed descent action of the suspension in the elastic working state. Until the displacement of the suspension cylinder is at L±ΔL for the second time, the suspension lowering two-position two-way solenoid valve 2 is de-energized. At this time, the one-key leveling ends and the suspension is in the middle position elastic leveling state.

[0036] When the suspension cylinder displacement is greater than L + ΔL, the suspension lowering two-position two-way solenoid valve 2, the suspension rapid lowering two-position two-way solenoid valve 7, and the spring stiffness switching two-position two-way solenoid valve 3 are first energized and turned on, realizing rapid suspension descent. When the suspension cylinder displacement is detected to be L ± ΔL for the first time, the suspension lowering two-position two-way solenoid valve 2 and the suspension rapid lowering two-position two-way solenoid valve 7 are de-energized. Due to the response delay of the solenoid valves and the inertia of the cylinder movement, the suspension cylinder will continue to descend, resulting in a cylinder displacement less than L - ΔL. Then, the suspension lift two-position two-way solenoid valve 1 and the spring stiffness switching two-position two-way solenoid valve 3 are energized and turned on, so that the large chamber, small chamber and accumulator of the suspension cylinder are simultaneously connected to the return oil through the suspension slow speed damping hole 6, realizing the slow lifting action of the suspension in the elastic working state. Until the displacement of the suspension cylinder is at L±ΔL for the second time, the suspension lift two-position two-way solenoid valve 1 is de-energized. At this time, the one-key leveling ends and the suspension is in the middle position elastic leveling state.

[0037] This invention enables vehicles to quickly raise and lower the suspension to adjust the vehicle height under complex road conditions, improving suspension operation efficiency and vehicle passability; at the same time, it can quickly realize the one-click suspension leveling function before the vehicle is driven on normal highways, improving the one-click suspension leveling efficiency and micro-motion performance, and enhancing the user's suspension operation experience.

Claims

1. A suspension valve assembly, comprising a working port A, a working port B, a return port T, an inlet port P, and an SP port for connection to an accumulator, characterized in that, It also includes a suspension lift control valve (1), a suspension drop control valve (2), a suspension fast lift control valve (4), a suspension slow lift damping orifice (5), a suspension slow drop damping orifice (6), and a suspension fast drop control valve (7). The suspension lift control valve (1) and the suspension slow lift damping hole (5) are connected in series between the P port and the A port of the suspension valve group, and the suspension fast lift control valve (4) and the suspension slow lift damping hole (5) are connected in parallel. The suspension drop control valve (2) and the suspension slow drop damping hole (6) are connected in series between the T port and the A port of the suspension valve group, and the suspension fast drop control valve (7) and the suspension slow drop damping hole (6) are connected in parallel. When the first port of the suspension lift control valve (1) is connected to port A, the second port of the suspension lift control valve (1) is connected to the first port of the suspension slow lift damping hole (5), the two ports of the suspension fast lift control valve (4) are respectively connected to the two ports of the suspension slow lift damping hole (5), and the second port of the suspension slow lift damping hole (5) is connected to port P; the first port of the suspension drop control valve (2) is connected to port A, the second port of the suspension drop control valve (2) is connected to the first port of the suspension slow drop damping hole (6), the two ports of the suspension fast drop control valve (7) are respectively connected to the two ports of the suspension slow drop damping hole (6), and the second port of the suspension slow drop damping hole (6) is connected to port T; When the second port of the suspension lift control valve (1) is connected to port P, the first port of the suspension lift control valve (1) is connected to the second port of the suspension slow lift damping hole (5), the two ports of the suspension fast lift control valve (4) are respectively connected to the two ports of the suspension slow lift damping hole (5), and the first port of the suspension slow lift damping hole (5) is connected to port A; the second port of the suspension drop control valve (2) is connected to port T, the first port of the suspension drop control valve (2) is connected to the second port of the suspension slow drop damping hole (6), the two ports of the suspension fast drop control valve (7) are respectively connected to the two ports of the suspension slow drop damping hole (6), and the first port of the suspension slow drop damping hole (6) is connected to port A.

2. The suspension valve assembly as described in claim 1, characterized in that, It also includes a spring-rigidity switching control valve (3) located between port A and port SP, which is used to control the on / off state of the accumulator and port A.

3. The suspension valve assembly as described in claim 1, characterized in that, Each control valve is a two-position, two-way solenoid directional valve.

4. A hydropneumatic suspension lifting and leveling system, characterized in that, It includes four suspension valve groups as described in any one of claims 1-3, namely, 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). It also includes the right front suspension cylinder assembly (21) and the left front suspension cylinder assembly (22) symmetrically arranged on both sides of the frame, and the right rear suspension cylinder assembly (23) and the left rear suspension cylinder assembly (24) symmetrically arranged on both sides of the frame. The right front suspension valve group (11), left front suspension valve group (12), right rear suspension valve group (13), and left rear suspension valve group (14) are used to control the extension and retraction of the right front suspension cylinder group (21), left front suspension cylinder group (22), right rear suspension cylinder group (23), and left rear suspension cylinder group (24).

5. The hydropneumatic suspension lifting and leveling system as described in claim 4, characterized in that, The large cavities of the cylinders in the right front suspension cylinder group (21), left front suspension cylinder group (22), right rear suspension cylinder group (23), and left rear suspension cylinder group (24) are interconnected, and the small cavities are also interconnected.

6. The hydropneumatic suspension lifting and leveling system as described in claim 5, characterized in that, Port A of the suspension valve assembly is connected to the large chamber of the suspension cylinder assembly located on the same side of the suspension valve assembly, and port B of the suspension valve assembly is connected to the small chamber of the suspension cylinder assembly located on the same side of the suspension valve assembly.

7. The hydropneumatic suspension lifting and leveling system as described in claim 4, characterized in that, All four suspension valve groups have accumulators connected to their SP ports.

8. An all-terrain crane, characterized in that, Includes the hydropneumatic suspension lifting and leveling system as described in any one of claims 4-7.

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