Hydraulic control system for dozer blade and landing leg of wheel excavator
By designing the hydraulic control system of the wheel excavator bulldozer and legs, and using pilot control to cooperate with the two solenoid valves, the separate control of the bulldozer and legs is achieved, which solves the problem that the bulldozer and legs cannot work at the same time and the single legs cannot operate independently in the existing technology, and improves the stability and flexibility of the entire machine operation.
Patent Information
- Application Number
- CN202422521700.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-10-17
AI Technical Summary
The existing wheeled excavators cannot work at the same time during operation, and the single leg cannot operate independently, so the working conditions are not fully adaptable.
A hydraulic control system for bulldozer and leg of the wheel excavator is designed. Through pilot control and two-connected solenoid valves, the individual control of bulldozer and leg is realized, and the pilot control circuit and main oil circuit switching circuit are added, including two-connected solenoid valves, bulldozer switching valves and leg switching valves. Various actions are achieved through rocker switch selection.
It realizes the separate control of bulldozer and outrigger, adapts to the needs of different working conditions, solves the problem that bulldozer and outrigger cannot work at the same time and that a single outrigger cannot operate independently in the existing technology, and improves the stability and flexibility of the entire machine operation.
Smart Images
Figure CN223240761U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engineering machinery, in particular to a hydraulic control system for a bulldozer and outriggers of a wheeled excavator. Background Art
[0002] Wheeled excavators are highly maneuverable, have the characteristics of rapid transfer capability, little damage to the ground, and multiple functions. They are widely used in municipal administration, forestry and other industries. With the rapid development of the economy and society, the market share of wheeled excavators has increased rapidly.
[0003] Because wheeled excavators are subject to significant forces during operation, these forces, when transmitted to the tires, can cause tire deformation and render the entire machine unstable. To improve operational stability, wheeled excavators often incorporate features such as bulldozers and outriggers. These are lowered during operation or parking, and retracted during travel.
[0004] The bulldozer and outrigger movements are controlled by a hydraulic system. A pilot handle controls the flow of pilot oil into the pilot control port of the main control valve, reversing the control valve. High-pressure oil from the main pump flows through the main control valve, center rotary joint, and switching valve into the bulldozer or outrigger cylinders, extending or retracting them to achieve the desired movement. However, current wheeled excavators equipped with both outriggers and bulldozers can only switch between outrigger and bulldozer movements. This means that the bulldozer and outrigger cannot be operated simultaneously, and only the left and right outriggers can be operated simultaneously. This makes it unsuitable for certain operating conditions, such as those requiring only one outrigger to be supported. Utility Model Content
[0005] In order to overcome at least one of the defects of the above-mentioned prior art, the utility model provides a hydraulic control system for the bulldozer and outrigger of a wheeled excavator, which realizes independent control of the bulldozer and outrigger through pilot control and two-way solenoid valve to adapt to different working conditions.
[0006] The utility model provides a hydraulic control system for a bulldozer and outriggers of a wheeled excavator, comprising: a pilot pump, a pilot handle and a main control valve connected in sequence; the pilot pump is connected to a two-way solenoid valve 1 and a two-way solenoid valve 2 arranged in parallel via a central rotary joint; the two-way solenoid valve 1 is connected to a bulldozer switching valve, and the two-way solenoid valve 2 is connected to an outrigger switching valve;
[0007] The bulldozer switching valve and the outrigger switching valve are arranged in parallel, and both are connected to the main pump through the center rotary joint and the main control valve in turn. The bulldozer switching valve is connected to the left bulldozer cylinder and the right bulldozer cylinder arranged in parallel, and the outrigger switching valve is connected to the left outrigger cylinder and the right outrigger cylinder arranged in parallel.
[0008] As a preferred embodiment, in the present invention, a hydraulic lock 1 is provided between the bulldozer switching valve and the left bulldozer cylinder and the right bulldozer cylinder, and a hydraulic lock 2 is provided between the outrigger switching valve and the left outrigger cylinder and the right outrigger cylinder.
[0009] As a preferred embodiment, in the present invention, the pilot pump is connected to the pilot handle and the center rotary joint via a pilot oil supply valve.
[0010] As a preferred embodiment, in the present invention, the main pump is driven by an engine, and the output shaft of the engine is connected to the main pump.
[0011] As a preferred embodiment, in the present invention, both the two-way solenoid valve 1 and the two-way solenoid valve 2 are controlled by a rocker switch.
[0012] As a preferred embodiment, in the present invention, the oil suction ports of the pilot pump, the main pump and the pilot handle are all connected to the hydraulic oil tank.
[0013] As a preferred embodiment, in the present utility model, the main control valve, the pilot handle, the two-way solenoid valve 1 and the two-way solenoid valve 2 are all provided with an oil return port for connecting to the hydraulic oil tank.
[0014] As a preferred embodiment, in the present utility model, a one-way valve is provided between the oil return port of the main control valve and the hydraulic oil tank;
[0015] And / or, a second one-way valve and a radiator are connected in series between the oil return port of the main control valve and the hydraulic oil tank.
[0016] As a preferred embodiment, in the present utility model, the oil drain ports of the main pump, the pilot pump, the bulldozer blade switching valve and the outrigger switching valve are all connected to the hydraulic oil tank.
[0017] As a preferred embodiment, in the present invention, a pilot filter and a pilot relief valve are connected in series between the oil drain port of the pilot pump and the hydraulic oil tank.
[0018] The beneficial effects of the hydraulic control system for the bulldozer and outriggers of the wheeled excavator provided by the utility model are as follows:
[0019] A new hydraulic control system has been designed to control the bulldozer blade or outriggers, adding a pilot control circuit and a main oil circuit switching circuit. It includes two-way solenoid valve 1, two-way solenoid valve 2, a bulldozer switching valve, and an outrigger switching valve. By selecting the rocker switch, the bulldozer blade can be moved alone, the left outrigger can be moved alone, the right outrigger can be moved alone, both left and right outriggers can be moved simultaneously, and the bulldozer and outriggers can be moved simultaneously. Furthermore, the control system has reserved interfaces on the two-way solenoid valve 1 and the bulldozer switching valve. When the bulldozer blade needs to be replaced with an outrigger (i.e., both the front and rear of the vehicle use outriggers), only connecting pipes need to be added to achieve simultaneous or single outrigger movement. This bulldozer and outrigger hydraulic control system solves the problems of existing bulldozer blades and outriggers not being able to work simultaneously, a single outrigger not being able to move independently, and incomplete adaptability to working conditions. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 The utility model is a schematic diagram of the electrical principle of the hydraulic control system of the bulldozer and outriggers of the wheeled excavator.
[0021] The meanings of the reference numerals are as follows:
[0022] 1. Hydraulic oil tank; 2. Pilot filter; 3. Pilot relief valve; 4. Pilot pump; 5. Main pump; 6. Engine; 7. Pilot handle; 8. Main control valve; 9. Pilot oil supply valve; 10. One-way valve 1; 11. One-way valve 2; 12. Radiator; 13. Center swivel joint; 14. Two-way solenoid valve 1; 15. Bulldozer switching valve; 16. Hydraulic lock 1; 17. Right bulldozer cylinder; 18. Left bulldozer cylinder; 19. Right outrigger cylinder; 20. Left outrigger cylinder; 21. Hydraulic lock 2; 22. Outrigger switching valve; 23. Two-way solenoid valve 2. DETAILED DESCRIPTION
[0023] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.
[0026] See Figure 1 The present utility model provides a hydraulic control system for a wheeled excavator's bulldozer and outriggers, comprising: a pilot pump 4, a pilot handle 7, and a main control valve 8, connected in sequence. The pilot pump 4 is connected to a two-way solenoid valve 14 and a two-way solenoid valve 23, which are arranged in parallel, via a center rotary joint 13. The two-way solenoid valve 14 is connected to a bulldozer switching valve 15, and the two-way solenoid valve 23 is connected to an outrigger switching valve 22. The bulldozer switching valve 15 and the outrigger switching valve 22 are arranged in parallel, and both are connected to a main pump 5 in sequence via the center rotary joint 13 and the main control valve 8. The bulldozer switching valve 15 is connected to a left bulldozer cylinder 18 and a right bulldozer cylinder 17, which are arranged in parallel. The outrigger switching valve 22 is connected to a left outrigger cylinder 20 and a right outrigger cylinder 19, which are arranged in parallel.
[0027] A new hydraulic control system is designed to control the bulldozer or outrigger, adding a pilot control circuit and a main oil circuit switching circuit, including a two-way solenoid valve 14, a two-way solenoid valve 23, a bulldozer switching valve 15 and an outrigger switching valve 22. Through the rocker switch, single action of the bulldozer, single action of the left outrigger, single action of the right outrigger, simultaneous action of the left and right outriggers, and simultaneous action of the bulldozer and outriggers can be achieved.
[0028] Furthermore, the control system features pre-defined interfaces on the dual-link solenoid valve 14 and the bulldozer blade switching valve 15. When the bulldozer blade needs to be replaced with outriggers, i.e., both front and rear outriggers are used, simply adding connecting pipes allows for simultaneous or individual outrigger actuation. This bulldozer and outrigger hydraulic control system addresses the existing issues of the bulldozer blade and outriggers not being able to operate simultaneously, the inability of a single outrigger to actuate independently, and the limited adaptability to various operating conditions.
[0029] Specifically, a hydraulic lock 16 is provided between the bulldozer switching valve 15 and both the left bulldozer cylinder 18 and the right bulldozer cylinder 17. A hydraulic lock 21 is provided between both the outrigger switching valve 22 and both the left outrigger cylinder 20 and the right outrigger cylinder 19. Hydraulic lock 16 controls the flow of oil between the bulldozer switching valve 15 and both the left bulldozer cylinder 18 and the right bulldozer cylinder 17. Hydraulic lock 21 controls the flow of oil between the outrigger switching valve 22 and both the left outrigger cylinder 20 and the right outrigger cylinder 19.
[0030] The pilot pump 4 is connected to the pilot handle 7 and the center rotary joint 13 through a pilot oil supply valve 9. The pilot oil supply valve 9 is used to control the on-off of the oil circuit between the pilot pump 4, the pilot handle 7 and the center rotary joint 13.
[0031] The main pump 5 is driven by an engine 6, and an output shaft of the engine 6 is connected to the main pump 5. The engine 6 is a power source of the wheeled excavator, and provides power to the main pump 5 and the working device of the wheeled excavator.
[0032] The two-way solenoid valve 14 and the two-way solenoid valve 2 23 are both controlled by a seesaw switch. The seesaw switch is used to select the power-on and power-off status of the solenoid valves on the two-way solenoid valve 14 and the two-way solenoid valve 2 23 to control whether there is pilot oil in the pilot control port of the corresponding bulldozer switching valve 15 and the reversing valve on the outrigger switching valve 22, thereby controlling the switching of the hydraulic oil circuit to realize the movement of the bulldozer or outrigger.
[0033] The oil suction ports of the pilot pump 4, the main pump 5 and the pilot handle 7 are all connected to the hydraulic oil tank 1. The hydraulic oil tank 1 stores hydraulic oil for use in the hydraulic control system.
[0034] The main control valve 8, the pilot handle 7, the two-way solenoid valve 14 and the two-way solenoid valve 23 are all provided with an oil return port to connect to the hydraulic oil tank 1. The setting of the oil return port is conducive to the recycling of hydraulic oil, energy saving and cost reduction.
[0035] A check valve 10 is installed between the return port of the main control valve 8 and the hydraulic oil tank 1. Alternatively, a check valve 11 and a radiator 12 are connected in series between the return port of the main control valve 8 and the hydraulic oil tank 1. Whether the main control valve 8 returns oil is determined by the oil level, thereby controlling whether the check valve 10 or the check valve 11 is open. When the hydraulic oil temperature is high, the radiator 12 can be used to cool the oil by opening the check valve 11.
[0036] The drain ports of the main pump 5, pilot pump 4, bulldozer switch valve 15, and outrigger switch valve 22 are all connected to the hydraulic oil tank 1. A pilot filter 2 and a pilot relief valve 3 are connected in series between the pilot pump 4 drain port and the hydraulic oil tank 1. The drain port helps improve internal pressure, and the pilot filter 2 filters the hydraulic oil to maintain cleanliness.
[0037] On the basis of the above structure, the principle of the hydraulic control system of the bulldozer and outrigger of the present invention is as follows:
[0038] The pilot handle 7 controls the pilot oil to enter the pilot control port of the main control valve 8, causing the main control valve 8 to reverse direction. As a result, the high-pressure oil from the main pump 5 passes through the main control valve 8 and the center rotary joint 13 and enters the front end of the bulldozer blade switching valve 15 and the outrigger switching valve 22. When the solenoid valve on the two-way solenoid valve 14 or the two-way solenoid valve 23 is energized, the pilot control oil is transmitted to the pilot control port of the bulldozer blade switching valve 15 or the outrigger switching valve 22, causing the bulldozer blade switching valve 15 or the outrigger switching valve 22 to reverse direction. The high-pressure oil in the main oil circuit enters the bulldozer blade cylinder or the outrigger cylinder to extend or retract it, thereby realizing the movement of the bulldozer blade or the outrigger.
[0039] The hydraulic system oil circuit can be divided into the main oil circuit, pilot oil circuit, return oil circuit and drain oil circuit. Among them:
[0040] Main oil circuit: Driven by the engine 6, the main pump 5 sucks oil from the hydraulic oil tank 1 and outputs high-pressure oil to the front end of the main control valve 8. When the pilot oil enters the pilot control port of the main control valve 8 to reverse the main control valve 8, the high-pressure oil is transmitted from the upper platform to the lower frame through the center rotary joint 13, and then passes through the bulldozer switching valve 15, hydraulic lock 16, outrigger switching valve 22, hydraulic lock 21 and enters the right bulldozer cylinder 17, left bulldozer cylinder 18, right outrigger cylinder 19, and left outrigger cylinder 20.
[0041] Pilot oil circuit 1: The pilot pump 4 outputs the pilot oil through the pilot oil supply valve 9 into the pilot handle 7. The pilot handle 7 is operated to transmit the pilot oil to the pilot control port of the main control valve 8, thereby controlling the reversing of the main control valve 8, so that the high-pressure oil from the main pump 5 is transmitted to the outrigger cylinder and the bulldozer cylinder, and realizes the switching of the cylinder extension and retraction action.
[0042] Pilot oil circuit two: The pilot oil output by the pilot pump 4 is transmitted to the two-way solenoid valve 14 and the two-way solenoid valve 2 23 of the lower frame through the pilot oil supply valve 9 and the center rotary joint 13. The pilot oil is controlled by the solenoid valve to gain or lose power and is transmitted to the pilot control ports of the bulldozer switching valve 15 and the outrigger switching valve 22, thereby reversing the direction of the bulldozer switching valve 15 and the outrigger switching valve 22, so that the high-pressure oil from the main oil circuit can enter the bulldozer cylinder or the outrigger cylinder to extend or retract it, thereby realizing the movement of the bulldozer and the outrigger.
[0043] Oil return line: The return oil from port T of the main control valve 8 enters the hydraulic oil tank 1 after being cooled by the one-way valve 10 or the one-way valve 2 11 and the radiator 12; the return oil from port T of the pilot handle 7, the two-way solenoid valve 14, and the two-way solenoid valve 2 23 returns directly to the hydraulic oil tank 1.
[0044] Oil drain circuit: The oil drain from the T port of the main pump 5, the bulldozer switching valve 15, and the outrigger switching valve 22 is directly returned to the hydraulic oil tank 1.
[0045] Hydraulic system control scheme: The solenoid valves SV1, SV2, SV3 and SV4 (spare) on the two-way solenoid valve 1 (14) or the two-way solenoid valve 2 (23) are controlled by a rocker switch, so that the pilot oil is transmitted to the corresponding pilot control ports of the reversing valves DV1, DV2, DV3 and DV4 (spare) on the bulldozer blade switching valve (15) and the outrigger switching valve (22), thereby controlling the switching of the main hydraulic oil circuit and realizing the movement of the bulldozer blade or the outrigger.
[0046] See the table below:
[0047]
[0048] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.
Claims
1. A wheeled excavator bulldozer and outrigger hydraulic control system, characterized in that: include: A pilot pump, a pilot handle, and a main control valve are connected in sequence. The pilot pump is connected to a two-way solenoid valve 1 and a two-way solenoid valve 2 arranged in parallel via a central rotary joint. The two-way solenoid valve 1 is connected to the bulldozer switching valve, and the two-way solenoid valve 2 is connected to the outrigger switching valve. The bulldozer blade switching valve and the outrigger switching valve are arranged in parallel, and both are connected to the main pump through the central rotary joint and the main control valve in turn. The bulldozer blade switching valve is connected to the left bulldozer blade oil cylinder and the right bulldozer blade oil cylinder arranged in parallel, and the outrigger switching valve is connected to the left outrigger oil cylinder and the right outrigger oil cylinder arranged in parallel.
2. The wheeled excavator bulldozer and outrigger hydraulic control system according to claim 1, characterized in that: A hydraulic lock 1 is provided between the bulldozer blade switching valve and the left bulldozer blade oil cylinder and the right bulldozer blade oil cylinder, and a hydraulic lock 2 is provided between the outrigger switching valve and the left outrigger oil cylinder and the right outrigger oil cylinder.
3. The hydraulic control system for the bulldozer and outrigger of a wheeled excavator according to claim 1, characterized in that: The pilot pump, the pilot handle and the central rotary joint are all connected via a pilot oil supply valve.
4. The wheeled excavator bulldozer and outrigger hydraulic control system according to claim 1, characterized in that: The main pump is driven by an engine, and an output shaft of the engine is connected to the main pump.
5. The wheeled excavator bulldozer and outrigger hydraulic control system according to claim 1, characterized in that: The two-way solenoid valve 1 and the two-way solenoid valve 2 are both controlled by a rocker switch.
6. The wheeled excavator bulldozer and outrigger hydraulic control system according to claim 1, characterized in that: The oil suction ports of the pilot pump, the main pump and the pilot handle are all connected to the hydraulic oil tank.
7. The wheeled excavator bulldozer and outrigger hydraulic control system according to claim 6, characterized in that: The main control valve, the pilot handle, the two-way solenoid valve 1 and the two-way solenoid valve 2 are all provided with an oil return port for connecting to the hydraulic oil tank.
8. The hydraulic control system for the bulldozer and outrigger of a wheeled excavator according to claim 7, characterized in that: A one-way valve 1 is provided between the oil return port of the main control valve and the hydraulic oil tank; And / or, a second one-way valve and a radiator are connected in series between the oil return port of the main control valve and the hydraulic oil tank.
9. The wheeled excavator bulldozer and outrigger hydraulic control system according to claim 6, characterized in that: The oil drain ports of the main pump, the pilot pump, the bulldozer blade switching valve and the outrigger switching valve are all connected to the hydraulic oil tank.
10. The hydraulic control system for the bulldozer and outrigger of a wheeled excavator according to claim 9, characterized in that: A pilot filter and a pilot relief valve are connected in series between the oil drain port of the pilot pump and the hydraulic oil tank.