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] At present, there is a vehicle-mounted construction machinery that can realize the functions of an aerial work platform and a trimmer on the same device. The current switching operation of this equipment is cumbersome and inefficient. Moreover, after the vehicle-mounted aerial work platform and the vehicle-mounted trimmer are switched, the same hydraulic system cannot meet the flow characteristic requirements of the aerial work platform and the trimmer at the same time, and the energy efficiency is relatively low. The leveling pipeline of the work platform requires a small flow rate and small leakage, while the trimmer pipeline requires high pressure and large flow, and requires reduced pressure loss. Summary of the invention

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

[0004] The technical solution provided by the present invention is as follows: 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 pressure oil. The system includes a first switching valve group, which is connected to a main oil circuit, a boom proportional multi-way valve, a trimmer and a leveling pipeline, and is used to achieve switching of the main oil circuit, so that the pressure oil flows to the boom proportional multi-way valve to achieve control of the boom movement, or flows to the trimmer and the leveling pipeline to achieve control of the trimmer movement and leveling of the work platform.

[0005] 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.

[0006] Preferably, the boom proportional multi-way valve is connected to the boom cylinder, the telescopic cylinder and the slewing motor.

[0007] 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, both the first solenoid reversing valve and the second solenoid reversing valve lose power. When the first switching valve group is energized, both the first solenoid reversing valve and the second solenoid reversing valve are energized. 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.

[0008] 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 via a balancing valve.

[0009] 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.

[0010] 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 oil return 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.

[0011] 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 on, 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.

[0012] 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.

[0013] 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.

[0014] Compared with the prior art, the present invention 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 switched, 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 for the leveling pipeline are adapted through the balancing valve, so that the large flow of the trimmer and the small flow of the leveling system are realized through multi-channel diversion, which has a good energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 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 present invention; Figure 2 for Figure 1 A schematic diagram of a first switching valve group in the hydraulic system shown; Figure 3 for Figure 1 Schematic diagram of the second switching valve group in the hydraulic system shown. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to 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 described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] 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.

[0019] 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 drawings, and are only for the convenience of describing the present 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 should not be understood as a limitation on the present application.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0021] 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 effects and purposes that can be achieved by this application.

[0022] like Figures 1 to 3 As shown, an embodiment of the present invention provides a hydraulic system that can meet the working requirements 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.

[0023] In this embodiment, the hydraulic system mainly includes an oil tank 1, an oil pump 2, a boom proportional multi-way valve 3, a first switching valve group 4, a second switching valve group 5, multiple other valves and pipelines, and is connected to a slewing 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 slewing, telescopic and boom adjustment of the boom through the slewing 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 action of the trimmer 11 by connecting to the trimmer 11.

[0024] The first switching valve group 4 is mainly used to realize the switching control of the pressure oil in the P circuit. It connects the main oil circuit, the boom proportional multi-way valve 3, the trimmer and the leveling pipeline, and is used to realize the switching of the main oil circuit, so that the pressure oil flows to the boom proportional multi-way valve 3 to control the movement of the boom, or flows to the trimmer and the leveling pipeline to control the movement of the trimmer and the leveling of the working platform.

[0025] 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 amplitude 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 amplitude movement, telescopic movement, and rotary movement).

[0026] 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, and 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 to the trimmer and the leveling pipeline through the first solenoid reversing valve 41.

[0027] In other embodiments, the first switching valve group 4 may also adopt other structural forms.

[0028] The second switching valve group 5 is mainly used to switch between telescopic and trimmer functions or manual leveling functions. It connects the first switching valve group 4, telescopic cylinder 7, trimmer and leveling pipeline, and is used to switch between telescopic cylinder 7, trimmer and leveling pipeline. In this way, the boom proportional multi-way valve 3 is directly connected to the variable amplitude cylinder 8 and the rotary motor 6, and connected to the telescopic cylinder 7 through the second switching valve group 5, making the structure more compact.

[0029] 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.

[0030] Specifically, the second switching valve group 5 includes a third electromagnetic reversing valve 51, a fourth electromagnetic reversing valve 52, and a balancing valve 53. The third electromagnetic reversing valve 51 and the fourth electromagnetic reversing valve 52 are two-position four-way valves. The A port of the third electromagnetic reversing valve 51 is connected to the A1 port of the second switching valve group 5, the B port is connected to the C1 port and the C3 port of the second switching valve group 5, the P port is connected to the A port of the second switching valve group 5, and the T port is connected to the T port of the second switching valve group 5. The A port of the fourth electromagnetic reversing valve 52 is connected to the C1 port and the C3 port of the second switching valve group 5, the B port is connected to the B1 port of the second switching valve group 5, the P port is connected to the B port of the second switching valve group 5, and the T port is connected to the T port of the second switching valve group 5; when the second switching valve group 5 loses power, the third electromagnetic reversing valve 51 and the fourth electromagnetic reversing valve 52 lose power, and when the second switching valve group 5 is powered on, the third electromagnetic reversing valve 51 and the fourth electromagnetic reversing valve 52 are powered on.

[0031] In this embodiment, the second switching valve group 5 is provided with two oil circuits directly connected to the trimmer pipeline (connected to the trimmer 11 via the trimmer pipeline), and two other oil circuits are connected to the leveling pipeline via the balance valve 53 (connected to the work platform leveling system 9 via the leveling pipeline). The balance valve 53 is connected between the third electromagnetic reversing valve 51, the fourth electromagnetic reversing valve 52 and the C1 port and the C2 port, and the third electromagnetic reversing valve 51 and the fourth electromagnetic reversing valve 52 are directly connected to the C3 port and the C4 port. In this way, the C1 port and the C2 port are connected to the leveling pipeline, and the balance valve 53 adapts to the pressure and flow required by the leveling pipeline. The C3 port and the C4 port are connected to the trimmer pipeline to avoid the pressure loss caused when the oil flows through the balance valve 53 when the trimmer is in operation.

[0032] In this embodiment, the second switching valve group 5 is in the form of a balancing valve + solenoid valve, and in other embodiments, it can be replaced by other forms such as a hydraulic lock + overflow valve + solenoid valve.

[0033] The control logic of the whole machine hydraulic system is as follows: When the equipment needs to perform trimmer operation, the pressure oil needs to pass through the first switching valve group 4 and then enter the second switching valve group 5, and the vehicle luffing, telescopic and rotational actions are prohibited. At this time, the first electromagnetic reversing valve 41 and the second electromagnetic reversing valve 42 are energized, and at the same time, the third electromagnetic reversing valve 51 and the fourth electromagnetic reversing valve 52 are energized.

[0034] When the equipment needs to perform the luffing action, telescopic action, and rotation action, the pressure oil needs to enter the boom proportional multi-way valve 3 after passing through the first switching valve group 4, and the pressure oil is prohibited from entering the trimmer pipeline. At this time, the first electromagnetic reversing valve 41 and the second electromagnetic reversing valve 42 are de-energized, and at the same time, the third electromagnetic reversing valve 51 and the fourth electromagnetic reversing valve 52 are de-energized.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those 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 will not be limited to the embodiments shown herein, but rather 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 trimmers, used to achieve hydraulic control of aerial work platforms and trimmers through pressure 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 switching 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 satisfying the operation of a vehicle-mounted aerial work platform and a trimmer as claimed in 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 ports are 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 cylinder, the telescopic cylinder and the slewing 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 gain 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 satisfying the operation of a vehicle-mounted aerial work platform and a trimmer as claimed in 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 via a balance 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 cylinder to achieve switching between the telescopic 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 oil return 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, but 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, wherein 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 on, 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, 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.

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 boom cylinder and the slewing motor, and is connected to the telescopic cylinder via the second switching valve group.

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