Hydraulic system of erecting vehicle and erecting vehicle

Abstract

The utility model discloses a hydraulic system of an erecting vehicle and the erecting vehicle, and relates to the field of vehicles, the hydraulic system comprises an oil tank, a pump unit, a switch valve, a multi-way valve assembly, a servo valve, a first reversing valve and a second reversing valve; according to the hydraulic system, the combination mode of the multi-way valve assembly and the servo valve is adopted, in the early stage of erecting and rotating, the multi-way valve assembly can be started to drive the first executing mechanism and the second executing mechanism to rapidly act with large flow, the action efficiency is improved, in the later stage of erecting and rotating, the switching valve is switched to the servo valve, and the working efficiency is improved. Accurate erecting and rotating are achieved through high-precision operation of the servo valves, and compared with a control mode that two servo valves are adopted in the traditional technology, the mode that the multi-way valve assembly and the servo valves are combined is adopted, and the cost can be greatly reduced on the premise that the working efficiency and precision are guaranteed; the vehicle erecting working efficiency is high, and the in-place accuracy is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicles, in particular to a hydraulic system of a vertical lifting vehicle and the vertical lifting vehicle. BACKGROUND

[0002] The vertical lifting vehicle is a common mechanical equipment, which generally comprises a chassis assembly, a rotating device, a vertical lifting device, a control box, a vertical lifting posture detector, an azimuth detector, a rotating motor, a vertical lifting cylinder (a telescopic cylinder), a vertical lifting box and the like. The vertical lifting vehicle drives the components on the vehicle to perform corresponding vertical lifting and rotating actions through a hydraulic system. The existing hydraulic system of the vertical lifting vehicle has the following problems: (1) long time consumption and low efficiency in operation positioning; and (2) high cost due to the use of two servo hydraulic circuits to control the vertical lifting angle and the azimuth angle respectively. CONTENT OF THE UTILITY MODEL

[0003] The hydraulic system of the vertical lifting vehicle and the vertical lifting vehicle provided by the embodiments of the present application can greatly reduce the cost while ensuring the working efficiency and precision.

[0004] In a first aspect, the present application provides a hydraulic system of a vertical lifting vehicle, comprising an oil tank, a pump unit, an on-off valve, a multi-way valve assembly, a servo valve, a first reversing valve and a second reversing valve. The oil inlet of the pump unit is in communication with the oil tank, and the oil outlet of the pump unit is in communication with the first oil port of the on-off valve. The second oil port of the on-off valve is in communication with the P port of the multi-way valve assembly, and the T port of the multi-way valve assembly is in communication with the oil tank. The A1 oil port and the B1 oil port of the multi-way valve assembly are in communication with a first actuating mechanism, and the A2 oil port and the B2 oil port of the multi-way valve assembly are in communication with a second actuating mechanism. The P port of the servo valve is in communication with the oil outlet of the pump unit, and the T port of the servo valve is in communication with the oil tank. The A port of the servo valve is in communication with the P port of the first reversing valve and the P port of the second reversing valve respectively, and the B port of the servo valve is in communication with the T port of the first reversing valve and the T port of the second reversing valve respectively. The A port and the B port of the first reversing valve are in communication with the first actuating mechanism, and the A port and the B port of the second reversing valve are in communication with the second actuating mechanism.

[0005] In a second aspect, the present application provides a vertical lifting vehicle, comprising a vehicle and a hydraulic system. The hydraulic system is arranged on the vehicle and is used to drive a vertical lifting box on the vehicle to perform pitching and rotating actions.

[0006] The hydraulic system and the vertical lifting vehicle of the present application have at least the following beneficial effects:

[0007] The hydraulic system of the application comprises an oil tank, a pump unit, a switch valve, a multi-way valve assembly, a servo valve, a first reversing valve and a second reversing valve; the hydraulic system of the application adopts the combination of the multi-way valve assembly and the servo valve, in the early stage of the erecting and rotating, the multi-way valve assembly can be enabled to drive the first and second actuators to move fast with large flow, and the action efficiency is improved, in the later stage of the erecting and rotating, the switch valve is switched to the servo valve, and the high-precision operation of the servo valve is used to realize accurate erecting and rotating, compared with the control mode of using two servo valves in the prior art, the combination of the multi-way valve assembly and the servo valve of the application can greatly reduce the cost under the premise of ensuring the working efficiency and the precision. BRIEF DESCRIPTION OF DRAWINGS

[0008] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is made with reference to the accompanying drawings.

[0009] Figure 1 is a schematic diagram of the hydraulic system of the embodiment of the application;

[0010] Figure 2 is a partial schematic diagram of Figure 1 ;

[0011] Figure 3 is a structural diagram of the erecting vehicle of the embodiment of the application;

[0012] The explanation of the reference signs is as follows:

[0013] 1, oil tank;

[0014] 2, pump unit;

[0015] 3, switch valve;

[0016] 4, multi-way valve assembly;

[0017] 5, servo valve;

[0018] 6, first reversing valve;

[0019] 7, second reversing valve;

[0020] 8, high-pressure filter;

[0021] 9, first check valve;

[0022] 10, second check valve;

[0023] 11, pressure compensator; 111, shuttle valve; 112, constant differential valve;

[0024] 12. first balance valve;

[0025] 13. second balance valve;

[0026] 14. radiator unit;

[0027] 15. oil return filter;

[0028] 16. first actuator;

[0029] 17. second actuator;

[0030] 100. vehicle; 110. erecting tank. DETAILED DESCRIPTION

[0031] The features and exemplary embodiments of the various aspects of the present application will be described in detail below with reference to the drawings. The following detailed description is merely intended to teach a person skilled in the art how to make and use the best mode of the present application and is not intended to limit the scope of the application. Therefore, specific structural and functional details disclosed herein are not to be interpreted in a manner that

[0032] It should be noted that the relational terms herein, such as first and second, and the like, are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0033] The present embodiment discloses a hydraulic system of an erecting vehicle, the hydraulic system comprising an oil tank 1, a pump unit 2, a switch valve 3, a multi-way valve assembly 4, a servo valve 5, a first reversing valve 6, and a second reversing valve 7;

[0034] The oil inlet of the pump unit 2 is communicated with the oil tank 1, and the oil in the oil tank 1 is pumped to various positions of the system through the pump unit 2. The oil outlet of the pump unit 2 is communicated with the first oil port of the on-off valve 3. The second oil port of the on-off valve 3 is communicated with the P port of the multi-way valve assembly 4. The on-off valve 3 controls the on-off of the high-pressure oil of the pump unit 2 to the multi-way valve assembly 4. In the embodiment, the pump unit 2 is preferably a constant pressure pump; and the on-off valve 3 is preferably a two-position two-way valve.

[0035] In some preferred embodiments, the pump unit 2 is communicated with the on-off valve 3 and the servo valve 5 through the high-pressure filter 8. The oil outlet of the pump unit 2 is communicated with the high-pressure filter 8. The oil outlet of the high-pressure filter 8 is communicated with the first oil port of the on-off valve 3 and the P port of the servo valve 5 respectively.

[0036] In some preferred embodiments, a first one-way valve 9 is arranged between the oil outlet of the pump unit 2 and the high-pressure filter 8. The first one-way valve 9 allows the hydraulic oil to flow from the oil outlet of the pump unit 2 to the high-pressure filter 8 in one direction. A second one-way valve 10 is arranged between the T port of the multi-way valve assembly 4 and the oil tank 1. The oil inlet of the second one-way valve 10 is communicated with the T port of the multi-way valve assembly 4. The oil outlet of the second one-way valve 10 is communicated with the oil tank 1. In the embodiment, the two one-way valves can ensure the stability of the high-pressure oil entering the system and the low-pressure oil returning, thereby improving the stability of the system.

[0037] The multi-way valve assembly 4 includes four working oil ports and two external oil ports. The four working oil ports are A1 port, B1 port, A2 port and B2 port. The A1 port and the B1 port are communicated with the first actuating mechanism 16. The first actuating mechanism 16 is configured as a telescopic cylinder on the vehicle. The A1 port is communicated with the rodless chamber of the telescopic cylinder. The B1 port is communicated with the rod chamber of the telescopic cylinder. The A2 port and the B2 port are communicated with the second actuating mechanism 17. The second actuating mechanism 17 is configured as a rotary motor on the vehicle. The A2 port is communicated with the first oil port (for example, the oil inlet) of the rotary motor. The B2 port is communicated with the second oil port (for example, the oil return port) of the rotary motor. The multi-way valve assembly 4 can drive the first actuating mechanism 16 and the second actuating mechanism 17 to perform corresponding telescopic and rotary actions through the four working oil ports. The two external oil ports of the multi-way valve assembly 4 are the P port and the T port. The P port is communicated with the second oil port of the on-off valve 3. The T port is communicated with the oil tank 1. The P port of the multi-way valve assembly 4 is a high-pressure oil port. The T port is an oil return port. The specific structure and working principle of the multi-way valve assembly 4 can refer to the existing hydraulic system of the engineering vehicle. The structure is a very mature prior art, and will not be described here.

[0038] In some preferred embodiments, the hydraulic system further comprises a radiator unit 14 and an oil return filter 15; the T port of the servo valve 5 and the T port of the multi-way valve assembly 4 are both in communication with the radiator unit 14, and the radiator unit 14 is in communication with the oil tank 1 through the oil return filter 15. The radiator unit 14 can dissipate the heat carried by the backflowing oil, avoiding the adverse effects caused by the backflowing of high-temperature oil into the oil tank 1. The oil return filter 15 is used to filter the backflowing oil, which can ensure the normal operation of the system.

[0039] The servo valve 5 comprises four oil ports, which are the P port, the T port, the A port and the B port of the servo valve 5 respectively. The P port of the servo valve 5 is in communication with the oil outlet of the pump unit 2 through the high-pressure filter 8, and the T port of the servo valve 5 is in communication with the oil tank 1. The A port of the servo valve 5 is in communication with the P port of the first reversing valve 6 and the P port of the second reversing valve 7 respectively, and the B port of the servo valve 5 is in communication with the T port of the first reversing valve 6 and the T port of the second reversing valve 7 respectively. In this embodiment, the servo valve 5 can be a three-position four-way valve or a three-position five-way valve.

[0040] In some preferred embodiments, a pressure compensator 11 is further included, which comprises a shuttle valve 111 and a constant differential pressure valve 112. The first inlet oil port of the shuttle valve 111 is in communication with the A port of the servo valve 5, and the second inlet oil port of the shuttle valve 111 is in communication with the B port of the servo valve 5. The outlet oil port of the shuttle valve 111 is in communication with the control oil port of the constant differential pressure valve 112. The inlet oil port of the constant differential pressure valve 112 is in communication with the oil outlet of the pump unit 2 through the high-pressure filter 8, and the outlet oil port of the constant differential pressure valve 112 is in communication with the P port of the servo valve 5. In this embodiment, by setting the pressure compensator 11, the front and back pressures of the servo valve 5 can be made substantially consistent, which can ensure the accuracy and stability of the system driving.

[0041] The first reversing valve 6 comprises four oil ports, which are the P port, the T port, the A port and the B port of the first reversing valve 6 respectively. The P port and the T port of the first reversing valve 6 are both in communication with the servo valve 5, and the A port and the B port of the first reversing valve 6 are in communication with the first actuator 16 (a telescopic oil cylinder). Specifically, the A port of the first reversing valve 6 is in communication with the rodless chamber of the telescopic oil cylinder, and the B port of the first reversing valve 6 is in communication with the rod chamber of the telescopic oil cylinder. The high-pressure oil passing through the first reversing valve 6 can drive the telescopic oil cylinder to perform corresponding telescopic actions. In this embodiment, the first reversing valve 6 is preferably a three-position four-way electromagnetic reversing valve.

[0042] The second reversing valve 7 includes four oil ports, the four oil ports of the second reversing valve 7 are P port, T port, A port and B port respectively, the P port and the T port of the second reversing valve 7 are communicated with the servo valve 5, the A port and the B port of the second reversing valve 7 are communicated with the second actuator 17 (the rotary motor), specifically, the A port of the second reversing valve 7 is communicated with the first oil port of the rotary motor, the B port is communicated with the second oil port of the rotary motor, and the high-pressure oil passing through the second reversing valve 7 can drive the rotary motor to perform corresponding rotary action. In the embodiment, the first reversing valve 6 and the second reversing valve 7 are preferably three-position four-way electromagnetic reversing valves.

[0043] In some preferred embodiments, the hydraulic system further comprises a first balance valve 12 and a second balance valve 13 (both preferably one-way balance valves); the first oil port (V oil port) of the first balance valve 12 is respectively communicated with the A port of the first reversing valve 6 and the A1 port of the multi-way valve assembly 4, the second oil port (C oil port) of the first balance valve 12 is communicated with the rodless cavity of the telescopic oil cylinder, and the third oil port (P oil port) of the first balance valve 12 is respectively communicated with the B port of the first reversing valve 6 and the B1 port of the multi-way valve assembly 4.

[0044] The first oil port (V oil port) of the second balance valve 13 is respectively communicated with the B port of the first reversing valve 6 and the B1 port of the multi-way valve assembly 4, the second oil port (C oil port) of the second balance valve 13 is communicated with the rod cavity of the telescopic oil cylinder, and the third oil port (P oil port) of the second balance valve 13 is respectively communicated with the A port of the first reversing valve 6 and the A1 port of the multi-way valve assembly 4.

[0045] In the embodiment, by setting two balance valves, the pressure and flow of the system can be kept in a relatively balanced state when the telescopic oil cylinder is working, thereby optimizing the operating efficiency and stability of the system.

[0046] The working principle of the hydraulic system of the embodiment is as follows:

[0047] The working principle is as follows:

[0048] The hydraulic oil from the oil tank 1 is pressurized by the pump unit 2, enters the first one-way valve 9, and the high-pressure filter 8, and the erecting process of the vehicle 100 is divided into two stages: the fast erecting and rotating stage and the high-precision erecting stage. The fast erecting and rotating stage aims to drive at a large flow rate, and the high-precision erecting stage aims to drive at a small flow rate and high precision.

[0049] I. Quick erecting and rotating stage: the multi-way valve assembly 4 supplies oil to the telescopic oil cylinder (i.e. the erecting oil cylinder) and the rotating motor, at this time, the servo valve 5, the first reversing valve 6 and the second reversing valve 7 are not electrified and in the neutral position, the electromagnet Y9 of the on-off valve 3 is electrified, the pressure oil flows to the multi-way valve assembly 4 through the high-pressure filter 8, wherein, when the erecting action is performed, the electromagnet Y5 (or Y6) of the multi-way valve assembly 4 is electrified, the pressure oil drives the telescopic oil cylinder to perform the extension (or retraction) action through the A1 port (or the B1 port) of the multi-way valve assembly 4 and the first balance valve 12 (or the second balance valve 13); when the rotating action is performed, the electromagnet Y7 (or Y8) of the multi-way valve assembly 4 is electrified, the pressure oil drives the rotating motor to perform the left rotation (or the right rotation) action through the A2 port (or the B2 port) of the multi-way valve assembly 4.

[0050] II. High-precision positioning stage: the servo valve 5 supplies oil to the telescopic oil cylinder and the rotating motor, at this time, the electromagnet Y9 of the on-off valve 3 is not electrified, no pressure oil flows through the multi-way valve assembly 4, wherein, when the erecting action is performed, the servo valve 5 is electrified, the electromagnet Y1 (or Y2) of the first reversing valve 6 is electrified, the second reversing valve 7 is not electrified and in the neutral position, the pressure oil flows to the servo valve 5, the first reversing valve 6, the first balance valve 12 (or the second balance valve 13) through the high-pressure filter 8 to drive the telescopic oil cylinder to perform the extension (or retraction) action; when the rotating action is performed, the servo valve 5 is electrified, the electromagnet Y1 (or Y2) of the second reversing valve 7 is electrified, the first reversing valve 6 is not electrified and in the neutral position, the pressure oil flows to the servo valve 5, the second reversing valve 7 through the high-pressure filter 8 to drive the rotating motor to perform the left rotation (or the right rotation) action.

[0051] The embodiment also discloses an erecting vehicle, which comprises a vehicle 100 and a hydraulic system arranged on the vehicle 100 and used for driving an erecting box 110 on the vehicle 100 to perform the pitching and rotating actions.

[0052] The above is merely a specific implementation of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the foregoing method embodiment, which will not be described herein. It should be understood that the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the present application, and these modifications or replacements shall be covered within the protection scope of the present application.

Claims

1. A hydraulic system for erecting a vehicle, characterized in that The hydraulic system comprises an oil tank (1), a pump unit (2), a switch valve (3), a multi-way valve assembly (4), a servo valve (5), a first reversing valve (6) and a second reversing valve (7); The oil inlet of the pump unit (2) is communicated with the oil tank (1), and the oil outlet of the pump unit (2) is communicated with the first oil port of the switch valve (3); the second oil port of the switch valve (3) is communicated with the P port of the multi-way valve assembly (4), and the T port of the multi-way valve assembly (4) is communicated with the oil tank (1); The A1 oil port and the B1 oil port of the multi-way valve assembly (4) are communicated with the first actuating mechanism (16), and the A2 oil port and the B2 oil port of the multi-way valve assembly (4) are communicated with the second actuating mechanism (17); The P port of the servo valve (5) is communicated with the oil outlet of the pump unit (2), and the T port of the servo valve (5) is communicated with the oil tank (1); the A port of the servo valve (5) is respectively communicated with the P port of the first reversing valve (6) and the P port of the second reversing valve (7), and the B port of the servo valve (5) is respectively communicated with the T port of the first reversing valve (6) and the T port of the second reversing valve (7); The A port and the B port of the first reversing valve (6) are communicated with the first actuating mechanism (16), and the A port and the B port of the second reversing valve (7) are communicated with the second actuating mechanism (17).

2. The hydraulic system of claim 1, wherein, The oil outlet of the pump unit (2) is communicated with a high-pressure filter (8), and the oil outlet of the high-pressure filter (8) is respectively communicated with the first oil port of the switch valve (3) and the P port of the servo valve (5).

3. The hydraulic system of claim 2, wherein, A first one-way valve (9) is arranged between the pump unit (2) and the high-pressure filter (8), and a second one-way valve (10) is arranged between the T port of the multi-way valve assembly (4) and the oil tank (1).

4. The hydraulic system of claim 1, wherein, Further comprising a pressure compensator (11), the pressure compensator (11) comprises a shuttle valve (111) and a constant differential valve (112), the first oil inlet of the shuttle valve (111) is communicated with the A port of the servo valve (5), the second oil inlet of the shuttle valve (111) is communicated with the B port of the servo valve (5); the oil outlet of the shuttle valve (111) is communicated with the control oil port of the constant differential valve (112), the oil inlet of the constant differential valve (112) is communicated with the oil outlet of the pump unit (2), and the oil outlet of the constant differential valve (112) is communicated with the P port of the servo valve (5).

5. The hydraulic system of claim 4, wherein, The first reversing valve (6) and the second reversing valve (7) are both three-position four-way reversing valves.

6. The hydraulic system according to any one of claims 1 to 5, characterized in that The first actuating mechanism (16) is configured as a telescopic oil cylinder, and the second actuating mechanism (17) is configured as a rotary motor.

7. The hydraulic system of claim 6, wherein, Further comprising a first balance valve (12) and a second balance valve (13); The first oil port of the first balance valve (12) is respectively communicated with the A port of the first reversing valve (6) and the A1 port of the multi-way valve assembly (4), the second oil port of the first balance valve (12) is communicated with the rodless cavity of the telescopic oil cylinder, and the third oil port of the first balance valve (12) is respectively communicated with the B port of the first reversing valve (6) and the B1 port of the multi-way valve assembly (4); The first balance valve (12) is communicated with the rodless cavity of the telescopic oil cylinder, and the third oil port of the first balance valve (12) is communicated with the B port of the first reversing valve (6) and the B1 port of the multi-way valve assembly (4). The first oil port of the second balance valve (13) is communicated with the B port of the first reversing valve (6) and the B1 port of the multi-way valve assembly (4) respectively, the second oil port of the second balance valve (13) is communicated with the rod cavity of the telescopic oil cylinder, and the third oil port of the second balance valve (13) is communicated with the A port of the first reversing valve (6) and the A1 port of the multi-way valve assembly (4) respectively.

8. The hydraulic system of claim 1, wherein, The pump unit (2) is configured as a constant pressure pump.

9. The hydraulic system of claim 8, wherein, The heat sink unit (14) and the oil return filter (15) are further included; the T port of the servo valve (5) and the T port of the multi-way valve assembly (4) are communicated with the heat sink unit (14), and the heat sink unit (14) is communicated with the oil tank (1) through the oil return filter (15).

10. A roll-up vehicle characterized by comprising: The hydraulic system of any one of claims 1 to 9 is arranged on the vehicle (100) and used to drive the erecting box (110) on the vehicle (100) to perform the pitching and rotating actions.

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