Hydraulic system capable of meeting working requirements of vehicle-mounted aerial work platform and trimmer

Abstract

The hydraulic system is used for achieving hydraulic control over the aerial work platform and the trimmer through pressure oil and comprises a first switching valve set, and the first switching valve set is connected with a main oil way, a boom proportional multi-way valve, the trimmer and a leveling pipeline. The hydraulic control system is used for achieving reversing of a main oil way, enabling pressure oil to flow to a boom proportional multi-way valve to control movement of a boom, or enabling the pressure oil to flow to a trimmer and a leveling pipeline to control movement of the trimmer and level a working platform. The system further comprises a second switching valve set, the second switching valve set is connected with the first switching valve set, the trimmer and the leveling pipeline, two oil ways are directly connected with the trimmer pipeline, and the other two oil ways are connected with the leveling pipeline through a balance valve. According to the hydraulic system capable of meeting work of the vehicle-mounted aerial work platform and the trimmer, reversing of the main oil way can be achieved, switching is rapid, operation is easy, and the good energy-saving effect is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and in particular to a hydraulic system that can meet the needs of vehicle-mounted aerial work platforms and trimmers. Background Art

[0002] Currently, there is a vehicle-mounted construction machine that can function as both an aerial work platform and a trimmer. However, switching between these two functions is cumbersome and inefficient. Furthermore, after switching between the vehicle-mounted aerial work platform and the trimmer, the same hydraulic system cannot meet the flow characteristics required by both, resulting in low energy efficiency. The platform's leveling piping requires low flow rates and minimal leakage, while the trimmer piping requires high pressure and high flow rates, requiring minimal pressure loss. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of this utility model is to provide a hydraulic system that can meet the working requirements of a vehicle-mounted aerial work platform and a mower. It has fast switching, simple operation, and can simultaneously meet the flow characteristic requirements of the aerial work platform and the mower.

[0004] The technical solutions provided by this utility model are as follows:

[0005] A hydraulic system that can meet the needs of vehicle-mounted aerial work platforms and mowers, and is used to achieve hydraulic control of the aerial work platform and the mower through pressurized oil. The system includes a first switching valve group, which is connected to the main oil circuit, the boom proportional multi-way valve, the mower and the leveling pipeline, and is used to achieve reversal of the main oil circuit, so that the pressurized oil flows to the boom proportional multi-way valve to achieve control of the boom movement, or flows to the mower and the leveling pipeline to achieve control of the mower movement and leveling of the work platform.

[0006] Preferably, the P port of the first switching valve group is connected to the main oil circuit, the P1 port is connected to the boom proportional multi-way valve, the T port is connected to the return oil circuit, and the A / B port is connected to the trimmer and the leveling pipeline; when the first switching valve group loses power, the pressure oil enters the boom proportional multi-way valve through the first switching valve group and cannot flow to the trimmer and the leveling pipeline; when the first switching valve group is energized, the pressure oil flows to the trimmer and the leveling pipeline through the first switching valve group and cannot enter the boom proportional multi-way valve.

[0007] Preferably, the boom proportional multi-way valve is connected to the boom cylinder, the telescopic cylinder, and the slewing motor.

[0008] Preferably, the first switching valve group includes a first solenoid reversing valve and a second solenoid reversing valve. The first solenoid reversing valve is a two-position two-way valve, which is normally open and connected to the main oil circuit and the boom proportional multi-way valve. The second solenoid reversing valve is a two-position four-way proportional valve, which is normally off and connected to the main oil circuit, the trimmer and the leveling pipeline. When the first switching valve group loses power, the first solenoid reversing valve and the second solenoid reversing valve both lose power. When the first switching valve group is energized, the first solenoid reversing valve and the second solenoid reversing valve both receive power. When the first switching valve group loses power, the pressure oil enters the boom proportional multi-way valve through the second solenoid reversing valve. When the first switching valve group is energized, the pressure oil flows to the trimmer and the leveling pipeline through the first solenoid reversing valve.

[0009] Preferably, it also includes a second switching valve group, which connects the first switching valve group, the trimmer and the leveling pipeline, has two oil circuits directly connected to the trimmer pipeline, and has two other oil circuits connected to the leveling pipeline through a balancing valve.

[0010] Preferably, the second switching valve group is also connected to the telescopic cylinder to achieve switching between the telescopic cylinder, the trimmer and the leveling pipeline.

[0011] Preferably, the A / B port of the second switching valve group is connected to the A / B port of the first switching valve group, the T port is connected to the return oil circuit, the A1 port and the B1 port are connected to the telescopic cylinder, the C1 port and the C2 port are connected to the leveling pipeline, and the C3 port and the C4 port are connected to the trimmer pipeline; when the second switching valve group loses power, the pressure oil enters the telescopic cylinder through the second switching valve group and cannot flow to the trimmer and the leveling pipeline, so that the telescopic cylinder can be operated, and the trimmer or manual leveling cannot be operated; when the second switching valve group is energized, the pressure oil flows to the trimmer and the leveling pipeline through the second switching valve group and cannot enter the telescopic cylinder, so that the telescopic cylinder cannot be operated, and the trimmer or manual leveling can be operated.

[0012] Preferably, the second switching valve group includes a third solenoid reversing valve and a fourth solenoid reversing valve, and the third solenoid reversing valve and the fourth solenoid reversing valve are two-position four-way valves. The A port of the third solenoid reversing valve is connected to the A1 port of the second switching valve group, the B port is connected to the C1 port and the C3 port of the second switching valve group, the P port is connected to the A port of the second switching valve group, and the T port is connected to the T port of the second switching valve group; the A port of the fourth solenoid reversing valve is connected to the C1 port and the C3 port of the second switching valve group, the B port is connected to the B1 port of the second switching valve group, the P port is connected to the B port of the second switching valve group, and the T port is connected to the T port of the second switching valve group; when the second switching valve group loses power, the third solenoid reversing valve and the fourth solenoid reversing valve are both powered off, and when the second switching valve group is powered on, the third solenoid reversing valve and the fourth solenoid reversing valve are both powered on.

[0013] Preferably, the balancing valve is connected between the third electromagnetic reversing valve, the fourth electromagnetic reversing valve and the C1 port, the C2 port, and the third electromagnetic reversing valve and the fourth electromagnetic reversing valve are directly connected to the C3 port, the C4 port.

[0014] Preferably, the boom proportional multi-way valve is directly connected to the boom cylinder and the slewing motor, and is connected to the telescopic cylinder via the second switching valve group.

[0015] Compared with the existing technology, the utility model can meet the hydraulic system requirements of vehicle-mounted aerial work platforms and trimmers. By setting a first switching valve group to connect the main oil circuit, the boom proportional multi-way valve, the trimmer and the leveling pipeline, the main oil circuit can be reversed, the switching is fast and the operation is simple. By setting a second switching valve group to connect the first switching valve group, the trimmer and the leveling pipeline, two oil circuits are directly connected to the trimmer pipeline, and two other oil circuits are connected to the leveling pipeline through a balancing valve, so that the pressure and flow required by the leveling pipeline are adapted through the balancing valve, and multi-channel diversion of the large flow of the trimmer and the small flow of the leveling system is achieved, which has a good energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of a hydraulic system that can meet the needs of a vehicle-mounted aerial work platform and a trimmer according to an embodiment of the utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of a first switching valve group in the hydraulic system shown;

[0019] Figure 3 for Figure 1 Schematic diagram of the second switching valve group in the hydraulic system shown. DETAILED DESCRIPTION

[0020] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0021] It should be noted that when an element is referred to as being “fixed on” or “set on” another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0024] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0025] like Figures 1 to 3 As shown, an embodiment of the present invention provides a hydraulic system that can meet the needs of a vehicle-mounted aerial work platform and a trimmer, and is used to achieve hydraulic control of the aerial work platform and the trimmer through pressurized oil.

[0026] In this embodiment, the hydraulic system mainly includes an oil tank 1, an oil pump 2, an arm proportional multi-way valve 3, a first switching valve group 4, a second switching valve group 5, and multiple other valves and pipelines, which are connected to a rotary motor 6, a telescopic cylinder 7, a boom cylinder 8, a work platform leveling system 9, a chassis leveling system 10, a trimmer 11, etc., so as to control the rotation, extension and boom of the arm through the rotary motor 6, the telescopic cylinder 7 and the boom cylinder 8, realize the leveling of the work platform through the work platform leveling system 9, realize the leveling of the chassis through the chassis leveling system 10, and drive and control the movement of the trimmer 11 by connecting to the trimmer 11.

[0027] The first switching valve group 4 is primarily used to control the direction of the pressure oil in line P. It connects the main oil circuit, the boom proportional multi-way valve 3, the trimmer, and the leveling pipeline. It switches the main oil circuit, directing the pressure oil to flow to the boom proportional multi-way valve 3 to control boom movement, or to the trimmer and leveling pipeline to control trimmer movement and level the work platform.

[0028] In this embodiment, the P port of the first switching valve group 4 is connected to the main oil circuit (in this embodiment, the P port of the first switching valve group 4 is also connected to the P port of the central rotary joint), the P1 port is connected to the boom proportional multi-way valve 3, the T port is connected to the return oil circuit, and the A / B port is connected to the trimmer and the leveling pipeline; when the first switching valve group 4 loses power, the pressure oil enters the boom proportional multi-way valve 3 through the first switching valve group 4 (the boom proportional multi-way valve 3 is connected to the boom cylinder, the telescopic cylinder, and the rotary motor), and cannot flow to the trimmer and the leveling pipeline. At this time, the vehicle can move normally (boom movement, telescopic movement, and rotary movement); when the first switching valve group 4 is energized, the pressure oil flows to the trimmer and the leveling pipeline through the first switching valve group 4, and cannot enter the boom proportional multi-way valve 3. At this time, the vehicle cannot move (boom movement, telescopic movement, and rotary movement).

[0029] In this embodiment, the first switching valve group 4 includes a first solenoid reversing valve 41 and a second solenoid reversing valve 42. The first solenoid reversing valve 41 is a two-position two-way valve, which is normally open and connects the main oil circuit and the boom proportional multi-way valve 3. The second solenoid reversing valve 42 is a two-position four-way proportional valve, which is normally off and connects the main oil circuit, the trimmer, and the leveling pipeline. When the first switching valve group 4 loses power, the first solenoid reversing valve 41 and the second solenoid reversing valve 42 both lose power. When the first switching valve group 4 is energized, the first solenoid reversing valve 41 and the second solenoid reversing valve 42 both gain power. When the first switching valve group 4 loses power, the pressure oil enters the boom proportional multi-way valve 3 through the second solenoid reversing valve 42; when the first switching valve group 4 is energized, the pressure oil flows through the first solenoid reversing valve 41 to the trimmer and the leveling pipeline.

[0030] In other embodiments, the first switching valve group 4 may also adopt other structural forms.

[0031] The second switching valve group 5 primarily switches between telescopic and trimmer functions or manual leveling. It connects the first switching valve group 4, the telescopic cylinder 7, the trimmer, and the leveling pipelines, enabling switching between these functions. This allows the boom proportional multi-way valve 3 to be directly connected to the luffing cylinder 8 and the slewing motor 6, and then to the telescopic cylinder 7 via the second switching valve group 5, resulting in a more compact structure.

[0032] In this embodiment, the A / B port of the second switching valve group 5 is connected to the A / B port of the first switching valve group 4, the T port is connected to the return oil circuit, the A1 port and the B1 port are connected to the telescopic cylinder 7, the C1 port and the C2 port are connected to the leveling pipeline, and the C3 port and the C4 port are connected to the trimmer pipeline; when the second switching valve group 5 loses power, the pressure oil enters the telescopic cylinder 7 through the second switching valve group 5 and cannot flow to the trimmer and the leveling pipeline, so that the telescopic cylinder 7 can be operated, and the trimmer or manual leveling cannot be operated; when the second switching valve group 5 is energized, the pressure oil flows to the trimmer and the leveling pipeline through the second switching valve group 5 and cannot enter the telescopic cylinder 7, so that the telescopic cylinder 7 cannot be operated, and the trimmer or manual leveling can be operated.

[0033] Specifically, the second switching valve group 5 includes a third solenoid reversing valve 51, a fourth solenoid reversing valve 52, and a balancing valve 53. The third and fourth solenoid reversing valves 51 and 52 are two-position, four-way valves. Port A of the third solenoid reversing valve 51 is connected to port A1 of the second switching valve group 5, port B is connected to ports C1 and C3 of the second switching valve group 5, port P is connected to port A of the second switching valve group 5, and port T is connected to port T of the second switching valve group 5. Port A of the fourth solenoid reversing valve 52 is connected to ports C1 and C3 of the second switching valve group 5, port B is connected to port B1 of the second switching valve group 5, port P is connected to port B of the second switching valve group 5, and port T is connected to port T of the second switching valve group 5. When the second switching valve group 5 is de-energized, both the third and fourth solenoid reversing valves 51 and 52 are de-energized. When the second switching valve group 5 is energized, both the third and fourth solenoid reversing valves 51 and 52 are energized.

[0034] In this embodiment, the second switching valve assembly 5 has two oil circuits directly connected to the trimmer pipeline (connected to the trimmer 11 via the trimmer pipeline), and two additional oil circuits connected to the leveling pipeline (connected to the work platform leveling system 9 via the leveling pipeline) via the balancing valve 53. The balancing valve 53 is connected between the third and fourth solenoid reversing valves 51 and 52 and ports C1 and C2. The third and fourth solenoid reversing valves 51 and 52 are directly connected to ports C3 and C4. Thus, ports C1 and C2 are connected to the leveling pipeline, and the balancing valve 53 adjusts the pressure and flow required by the leveling pipeline. Ports C3 and C4 are connected to the trimmer pipeline, preventing pressure loss caused by oil flowing through the balancing valve 53 when the trimmer is operating.

[0035] In this embodiment, the second switching valve group 5 is in the form of a balancing valve + a solenoid valve, which can be replaced by other forms such as a hydraulic lock + a relief valve + a solenoid valve in other embodiments.

[0036] The control logic of the whole machine hydraulic system is as follows:

[0037] When the machine is in trimmer operation, the pressurized oil passes through the first switching valve group 4 and then into the second switching valve group 5. Luffing, telescoping, and rotational movements are prohibited. At this time, the first and second solenoid reversing valves 41 and 42 are energized, while the third and fourth solenoid reversing valves 51 and 52 are also energized.

[0038] When the equipment needs to perform boom-to-boom, telescopic, or slewing movements, the pressurized oil must pass through the first switching valve group 4 before entering the boom proportional multi-way valve 3, and the pressurized oil is prohibited from entering the trimmer pipeline. At this time, the first and second solenoid reversing valves 41 and 42 are de-energized, and the third and fourth solenoid reversing valves 51 and 52 are also de-energized.

[0039] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic system that can meet the needs of vehicle-mounted aerial work platforms and mowers, used to achieve hydraulic control of the aerial work platforms and mowers through pressurized oil, characterized in that: It includes a first switching valve group, which connects the main oil circuit, the boom proportional multi-way valve, the trimmer and the leveling pipeline, and is used to realize the reversal of the main oil circuit, so that the pressure oil flows to the boom proportional multi-way valve to control the movement of the boom, or flows to the trimmer and the leveling pipeline to control the movement of the trimmer and level the working platform.

2. The hydraulic system capable of meeting the requirements of a vehicle-mounted aerial work platform and a trimmer according to claim 1, characterized in that: The P port of the first switching valve group is connected to the main oil circuit, the P1 port is connected to the boom proportional multi-way valve, the T port is connected to the return oil circuit, and the A / B port is connected to the trimmer and the leveling pipeline; when the first switching valve group loses power, the pressure oil enters the boom proportional multi-way valve through the first switching valve group and cannot flow to the trimmer and the leveling pipeline; when the first switching valve group is energized, the pressure oil flows to the trimmer and the leveling pipeline through the first switching valve group and cannot enter the boom proportional multi-way valve.

3. The hydraulic system capable of satisfying the operation of a vehicle-mounted aerial work platform and a trimmer as claimed in claim 2, characterized in that: The boom proportional multi-way valve is connected to the luffing oil cylinder, the telescopic oil cylinder and the rotary motor.

4. The hydraulic system capable of satisfying the operation of a vehicle-mounted aerial work platform and a trimmer as claimed in claim 2, characterized in that: The first switching valve group includes a first solenoid reversing valve and a second solenoid reversing valve. The first solenoid reversing valve is a two-position two-way valve, which is normally open and connected to the main oil circuit and the boom proportional multi-way valve. The second solenoid reversing valve is a two-position four-way proportional valve, which is normally off and connected to the main oil circuit, the trimmer and the leveling pipeline. When the first switching valve group loses power, the first solenoid reversing valve and the second solenoid reversing valve both lose power. When the first switching valve group is energized, the first solenoid reversing valve and the second solenoid reversing valve both receive power. When the first switching valve group loses power, the pressure oil enters the boom proportional multi-way valve through the second solenoid reversing valve. When the first switching valve group is energized, the pressure oil flows to the trimmer and the leveling pipeline through the first solenoid reversing valve.

5. The hydraulic system capable of meeting the requirements of a vehicle-mounted aerial work platform and a trimmer according to any one of claims 1 to 4, characterized in that: It also includes a second switching valve group, which is connected to the first switching valve group, the trimmer and the leveling pipeline. Two oil circuits are directly connected to the trimmer pipeline, and two other oil circuits are connected to the leveling pipeline through a balancing valve.

6. The hydraulic system capable of satisfying the operation of a vehicle-mounted aerial work platform and a trimmer as claimed in claim 5, characterized in that: The second switching valve group is also connected to the telescopic oil cylinder for realizing switching between the telescopic oil cylinder, the trimmer and the leveling pipeline.

7. The hydraulic system capable of satisfying the operation of a vehicle-mounted aerial work platform and a trimmer as claimed in claim 6, characterized in that: The A / B port of the second switching valve group is connected to the A / B port of the first switching valve group, the T port is connected to the return oil circuit, the A1 port and the B1 port are connected to the telescopic cylinder, the C1 port and the C2 port are connected to the leveling pipeline, and the C3 port and the C4 port are connected to the trimmer pipeline; when the second switching valve group loses power, the pressure oil enters the telescopic cylinder through the second switching valve group and cannot flow to the trimmer and the leveling pipeline, so that the telescopic cylinder can be operated, and the trimmer or manual leveling cannot be operated; when the second switching valve group is energized, the pressure oil flows to the trimmer and the leveling pipeline through the second switching valve group and cannot enter the telescopic cylinder, so that the telescopic cylinder cannot be operated, and the trimmer or manual leveling can be operated.

8. The hydraulic system capable of satisfying the operation of a vehicle-mounted aerial work platform and a trimmer as claimed in claim 7, characterized in that: The second switching valve group includes a third solenoid reversing valve and a fourth solenoid reversing valve. The third solenoid reversing valve and the fourth solenoid reversing valve are two-position four-way valves. The A port of the third solenoid reversing valve is connected to the A1 port of the second switching valve group, the B port is connected to the C1 port and the C3 port of the second switching valve group, the P port is connected to the A port of the second switching valve group, and the T port is connected to the T port of the second switching valve group; the A port of the fourth solenoid reversing valve is connected to the C1 port and the C3 port of the second switching valve group, the B port is connected to the B1 port of the second switching valve group, the P port is connected to the B port of the second switching valve group, and the T port is connected to the T port of the second switching valve group; when the second switching valve group loses power, the third solenoid reversing valve and the fourth solenoid reversing valve are both powered off, and when the second switching valve group is powered on, the third solenoid reversing valve and the fourth solenoid reversing valve are both powered on.

9. The hydraulic system capable of satisfying the operation of a vehicle-mounted aerial work platform and a trimmer as claimed in claim 8, characterized in that: The balancing valve is connected between the third electromagnetic reversing valve, the fourth electromagnetic reversing valve and the C1 port and the C2 port, while the third electromagnetic reversing valve and the fourth electromagnetic reversing valve are directly connected to the C3 port and the C4 port.

10. The hydraulic system capable of satisfying the operation of a vehicle-mounted aerial work platform and a trimmer as claimed in claim 6, characterized in that: The boom proportional multi-way valve is directly connected to the luffing cylinder and the slewing motor, and is connected to the telescopic cylinder via the second switching valve group.

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