Supporting leg, dozer blade action control hydraulic system and wheel excavator
By installing a triple solenoid valve and hydraulic lock on the upper part of the wheeled excavator, the hydraulic system is simplified, the high cost and complex piping problems of controlling the bulldozer blade and outriggers are solved, and safe and efficient independent or combined action control is achieved.
Patent Information
- Application Number
- CN202423019891.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-09
AI Technical Summary
In the existing hydraulic control systems of wheeled excavators, the independent control valves for the bulldozer blade and outriggers suffer from high costs and low utilization rates. At the same time, the undercarriage piping is complex, affecting safety and economy.
A triple solenoid valve is installed on the upper part of the wheeled excavator and connected to a hydraulic lock through a central slewing body, simplifying the hydraulic control system. The solenoid valve and hydraulic lock are integrated into the upper part, enabling independent or combined control of the bulldozer blade and outrigger cylinders.
The hydraulic system structure has been simplified, costs have been reduced, utilization has been improved, and operational safety has been ensured, avoiding the risks associated with the presence of electrical equipment under the vehicle.
Smart Images
Figure CN223535784U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of excavator technology, and in particular to a hydraulic system for controlling the movement of outriggers and bulldozer blades, and a wheeled excavator. Background Technology
[0002] Wheeled excavators are highly maneuverable and widely used in road construction and other fields. They are typically equipped with a bulldozer blade for bulldozing operations, and to improve stability during excavation and other tasks, they usually also have two independently extendable outriggers. To control the raising and lowering of the bulldozer blade and the independent extension and retraction of the outriggers, each hydraulic actuator is often equipped with an independent directional valve. However, in wheeled excavators, the raising and lowering of the bulldozer blade and the extension and retraction of the outriggers are used infrequently, and the machine is stationary during these operations. Therefore, equipping wheeled excavators with independently controlled directional valves for the outriggers and bulldozer blade suffers from high cost and low utilization rates.
[0003] Existing patent CN221569037U discloses a hydraulic control system and a wheeled excavator. It uses a single control main valve and multiple simple switching valves and solenoid valves to achieve independent extension and retraction of the bulldozer lifting cylinder and the outrigger extension cylinders, resulting in low cost. However, the undercarriage of this wheeled excavator has two hydraulically controlled switching valves to control the bulldozing and outrigger operation. The addition of these switching valves increases the number of pipelines in the undercarriage, making the hydraulic control system more complex. Utility Model Content
[0004] In order to overcome at least one of the defects mentioned above in the prior art, the purpose of this utility model is to provide a hydraulic system for controlling the movement of outriggers and bulldozer blades, as well as a wheeled excavator. By setting a central slewing body, a triple solenoid valve is installed on the upper part of the wheeled excavator, so that the lower part of the wheeled excavator is not electrified, and at the same time the hydraulic control system is simplified.
[0005] The technical solution adopted by this utility model to solve its problem is:
[0006] A hydraulic control system for outriggers and a bulldozer blade includes: a main pump and a pilot pump. The main pump is connected to a main control valve. The pilot pump is connected via a pilot oil supply valve to a pilot handle and a three-way solenoid valve arranged in parallel. The pilot handle is connected to the main control valve. The main control valve is connected via a central rotating body to a first outrigger cylinder, a second outrigger cylinder, and a bulldozer blade cylinder arranged in parallel. Hydraulic locks are provided on the oil lines between the first outrigger cylinder, the second outrigger cylinder, and the bulldozer blade cylinder and the main control valve. The three-way solenoid valve is connected to the hydraulic locks via the central rotating body.
[0007] In a preferred embodiment, the three-electromagnetic valve in this invention includes three solenoid valves arranged in parallel: solenoid valve one, solenoid valve two, and solenoid valve three. Each of the three solenoid valves is connected to a corresponding hydraulic lock via a central rotating body.
[0008] In a preferred embodiment, in this utility model, the three-way solenoid valve is equipped with hydraulic lock one, hydraulic lock two, and hydraulic lock three respectively for the first outrigger cylinder, the second outrigger cylinder, and the bulldozer blade cylinder. The main control valve is connected to the corresponding first outrigger cylinder, the second outrigger cylinder, and the bulldozer blade cylinder through hydraulic lock one, hydraulic lock two, and hydraulic lock three respectively.
[0009] In a preferred embodiment of the present invention, both the main pump and the pilot pump are driven by an engine, and both the main pump and the pilot pump are connected to a hydraulic oil tank.
[0010] In a preferred embodiment of this invention, the main control valve, pilot handle, triple solenoid valve, and pilot oil supply valve are all connected to the hydraulic oil tank via a return oil circuit, and the main pump is connected to the hydraulic oil tank via a drain oil circuit.
[0011] In a preferred embodiment of this invention, a return oil filter is provided on the return oil circuit of the main control valve.
[0012] In a preferred embodiment of this invention, a second check valve is provided on the return oil circuit of the main control valve, and the second check valve is located between the main control valve and the return oil filter.
[0013] In a preferred embodiment of the present invention, a check valve and a radiator are connected in series in the oil return circuit of the main control valve, and the check valve and the radiator are located between the main control valve and the oil return filter.
[0014] In a preferred embodiment, in this utility model, solenoid valve one, solenoid valve two, and solenoid valve three are all connected to rocker switches, which are used to control the on / off state of the corresponding solenoid valve one, solenoid valve two, or solenoid valve three.
[0015] A wheeled excavator includes: the aforementioned outriggers and a hydraulic system for controlling the movement of the bulldozer blade.
[0016] The beneficial effects of the outrigger and bulldozer blade motion control hydraulic system and the wheeled excavator provided by this utility model are as follows:
[0017] The triple solenoid valve controls the opening and closing of the corresponding hydraulic locks in the hydraulic circuits of the first outrigger cylinder, the second outrigger cylinder, and the dozer blade cylinder. This facilitates the flow of hydraulic oil from the main control valve to these cylinders, enabling independent, simultaneous (two at a time), or all three cylinders to operate simultaneously, greatly simplifying the hydraulic control system. Furthermore, the central slewing mechanism allows the triple solenoid valve to be located on the upper part of the wheeled excavator, ensuring that the excavator is not energized when off the ground, thus guaranteeing operational safety. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the hydraulic system for controlling the movement of the outriggers and bulldozer blades of this utility model.
[0019] The meanings of the reference numerals in the attached figures are as follows:
[0020] 1. Engine; 2. Main pump; 3. Pilot pump; 4. Pilot handle; 5. Main control valve; 6. Pilot oil supply valve; 7. Solenoid valve one; 8. Solenoid valve two; 9. Solenoid valve three; 10. Central slewing body; 11. Hydraulic lock one; 12. First outrigger cylinder; 13. Hydraulic lock two; 14. Second outrigger cylinder; 15. Hydraulic lock three; 16. Bulldozer blade cylinder; 17. Hydraulic oil tank; 18. Return oil filter; 19. Check valve one; 20. Check valve two; 21. Radiator. Detailed Implementation
[0021] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.
[0022] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
[0024] This utility model provides a wheeled excavator, which includes a first outrigger, a second outrigger, and a bulldozer blade. During excavator operation, the first outrigger, second outrigger, and bulldozer blade may operate in the following ways: the first outrigger moves independently; the second outrigger moves independently; the bulldozer blade moves independently; the first outrigger and second outrigger move simultaneously; the first outrigger and bulldozer blade move simultaneously; the second outrigger and bulldozer blade move simultaneously; and all three (first outrigger, second outrigger, and bulldozer blade) move simultaneously. The movements of the first outrigger, second outrigger, and bulldozer blade are controlled by a hydraulic system.
[0025] See Figure 1 This utility model also provides a hydraulic system for controlling the movement of outriggers and bulldozer blades, including: a main pump 2 and a pilot pump 3. The main pump 2 is connected to a main control valve 5. The pilot pump 3 is connected to a pilot handle 4 and a three-way solenoid valve in parallel via a pilot oil supply valve 6. The pilot handle 4 is connected to the main control valve 5. The main control valve 5 is connected to a first outrigger cylinder 12, a second outrigger cylinder 14 and a bulldozer blade cylinder 16 in parallel via a central rotating body 10. Hydraulic locks are provided on the oil lines between the first outrigger cylinder 12, the second outrigger cylinder 14 and the bulldozer blade cylinder 16 and the main control valve 5. The three-way solenoid valve is connected to the hydraulic locks via the central rotating body 10.
[0026] The triple solenoid valve controls the opening and closing of the corresponding hydraulic locks on the hydraulic lines of the first outrigger cylinder 12, the second outrigger cylinder 14, and the bulldozer blade cylinder 16. This facilitates the flow of hydraulic oil from the main control valve 5 to these cylinders, enabling independent, simultaneous (two at a time), or all three cylinders to operate simultaneously, greatly simplifying the hydraulic control system. Furthermore, the central slewing body 10 positions the triple solenoid valve on the upper part of the wheeled excavator, ensuring the excavator is not energized when off the ground, thus guaranteeing operational safety.
[0027] Specifically, the triple solenoid valve system includes solenoid valve 7, solenoid valve 8, and solenoid valve 9 connected in parallel. Each of these three valves is connected to a corresponding hydraulic lock via a central rotating body 10. Solenoid valve 7 controls the opening and closing of the hydraulic lock on the hydraulic circuit of the bulldozer blade cylinder 16; solenoid valve 8 controls the opening and closing of the hydraulic lock on the hydraulic circuit of the second outrigger cylinder 14; and solenoid valve 9 controls the opening and closing of the hydraulic lock on the hydraulic circuit of the first outrigger cylinder 12. The three solenoid valves are independently controlled, ensuring precise control of the opening and closing of the three cylinder circuits.
[0028] The three-way solenoid valve is equipped with hydraulic lock 11, hydraulic lock 213 and hydraulic lock 315 respectively for the first outrigger cylinder 12, the second outrigger cylinder 14 and the bulldozer blade cylinder 16. The main control valve 5 is connected to the corresponding first outrigger cylinder 12, the second outrigger cylinder 14 and the bulldozer blade cylinder 16 through hydraulic lock 11, hydraulic lock 213 and hydraulic lock 315 respectively.
[0029] Solenoid valve 7 controls hydraulic lock 15 to open and close the oil circuit of bulldozer blade cylinder 16. Solenoid valve 8 controls hydraulic lock 13 to open and close the oil circuit of second outrigger cylinder 14. Solenoid valve 9 controls hydraulic lock 11 to open and close the oil circuit of first outrigger cylinder 12. This facilitates the flow of hydraulic oil from main control valve 5 to first outrigger cylinder 12, second outrigger cylinder 14, and bulldozer blade cylinder 16.
[0030] Solenoid valve 7, solenoid valve 8, and solenoid valve 9 are all connected to rocker switches. The rocker switches are used to control the on / off state of the corresponding solenoid valve 7, solenoid valve 8, or solenoid valve 9. The solenoid valves 7, 8, and 9 are controlled by the rocker switches to control the opening and closing of the corresponding hydraulic locks 15, 13, and 11, thereby controlling whether the hydraulic oil in the main control valve 5 flows to the bulldozer blade cylinder 16, the second outrigger cylinder 14, and the first outrigger cylinder 12.
[0031] The hydraulic oil for the main control valve 5 and the triple solenoid valve is supplied by the main pump 2 and the pilot pump 3. Both the main pump 2 and the pilot pump 3 are driven by the engine 1 and are connected to the hydraulic oil tank 17. When the engine 1 starts, the main pump 2 draws hydraulic oil and delivers it to the front end of the main control valve 5. The pilot pump 3 draws hydraulic oil and delivers it to the triple solenoid valve and the pilot handle 4 via the pilot oil supply valve 6. This allows for manual control of the pilot handle 4 to transmit pilot oil to the main control valve 5, thereby controlling the main control valve 5 to switch directions. This enables the hydraulic oil in the main control valve 5 to flow to the large or small chamber of the corresponding cylinder, facilitating cylinder movement.
[0032] The main control valve 5, pilot handle 4, triple solenoid valve, and pilot supply valve 6 are all connected to the hydraulic oil tank 17 via a return oil circuit, while the main pump 2 is connected to the hydraulic oil tank 17 via a drain oil circuit. The return oil circuit facilitates the circulation of hydraulic oil, saving energy and reducing costs. The drain oil circuit improves the internal pressure of the main pump 2 and also facilitates the circulation of hydraulic oil.
[0033] The return oil circuit of the main control valve 5 is equipped with a return oil filter 18. The return oil filter 18 can filter impurities in the hydraulic oil to prevent damage to the components.
[0034] A second check valve 20 is provided on the return oil circuit of the main control valve 5, and the second check valve 20 is located between the main control valve 5 and the return oil filter 18. And / or, a first check valve 19 and a radiator 21 are connected in series on the return oil circuit of the main control valve 5, and the first check valve 19 and the radiator 21 are located between the main control valve 5 and the return oil filter 18. Whether the main control valve 5 returns oil depends on the oil volume, thereby controlling whether the first check valve 19 or the second check valve 20 is open. When the hydraulic oil temperature is high, the radiator 21 can be used to cool it down by opening the first check valve 19.
[0035] Based on the above structure, the operating principle of the hydraulic system for controlling the outriggers and bulldozer blade of this utility model is as follows:
[0036] Pilot handle 4 controls the pilot oil to enter the pilot control port of main control valve 5, causing main control valve 5 to switch. This allows hydraulic oil from main pump 2 to pass through main control valve 5 and central rotating body 10, entering the front ends of hydraulic lock 11, hydraulic lock 23, and hydraulic lock 35. When any of solenoid valves 1-7, 2-8, or 3-9 is energized, it controls the corresponding hydraulic lock 3-15, hydraulic lock 2-13, or hydraulic lock 1-11 to open, allowing hydraulic oil to enter the corresponding cylinder, causing it to extend or retract, thereby realizing the movement of the bulldozer blade and / or outriggers.
[0037] Hydraulic system circuits can be divided into main circuits, pilot circuits, return circuits, and drain circuits, among which:
[0038] Main oil circuit: Driven by engine 1, main pump 2 draws hydraulic oil from hydraulic oil tank 17 and outputs it to the front end of main control valve 5. When pilot oil enters the pilot control port of main control valve 5 and causes main control valve 5 to switch, hydraulic oil is transmitted from the upper platform to the lower frame through the central rotating body 10, and then enters the first outrigger cylinder 12, the second outrigger cylinder 14, and the bulldozer blade cylinder 16 through hydraulic lock 11, hydraulic lock 2 13, and hydraulic lock 3 15.
[0039] Pilot oil circuit 1: Pilot oil output from pilot pump 3 enters pilot handle 4 through pilot oil supply valve 6. Operating pilot handle 4 transmits pilot oil to pilot control port of main control valve 5, thereby controlling the switching of main control valve 5 and realizing the switching of extension and retraction actions of first outrigger cylinder 12, second outrigger cylinder 14, and bulldozer blade cylinder 16.
[0040] Pilot oil circuit 2: Pilot pump 3 outputs pilot oil, which passes through pilot oil supply valve 6 and reaches solenoid valve 1 7, solenoid valve 2 8, and solenoid valve 3 9, thereby controlling hydraulic lock 3 15, hydraulic lock 2 13, and hydraulic lock 1 11 to open, so that hydraulic oil from the main oil circuit can enter the first outrigger cylinder 12, the second outrigger cylinder 14, and the bulldozer blade cylinder 16, causing them to extend or retract, thus realizing the action of the bulldozer blade and outriggers.
[0041] Return oil circuit: The return oil from the main control valve 5 passes through check valve 20 or check valve 19 and radiator 21 for cooling, and then enters the hydraulic oil tank 17 through the return oil filter 18. The return oil from the pilot handle 4, solenoid valve 1 7, solenoid valve 2 8, solenoid valve 3 9 and pilot supply valve 6 returns directly to the hydraulic oil tank 17.
[0042] Oil drain circuit: The main pump 2 drains oil directly back to the hydraulic oil tank 17.
[0043] The hydraulic system control scheme is as follows: The rocker switch controls solenoid valve SV1 on solenoid valve 7, solenoid valve SV2 on solenoid valve 8, and solenoid valve SV3 on solenoid valve 9, so that pilot oil is transmitted to hydraulic lock 15, hydraulic lock 13, and hydraulic lock 11 to open the corresponding pilot control ports, thereby controlling the on / off of the main hydraulic oil circuit and realizing the movement of the bulldozer blade and / or outriggers. See the table below:
[0044]
[0045] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.
Claims
1. A hydraulic system for controlling the movement of outriggers and bulldozer blades, characterized in that, include: The system includes a main pump and a pilot pump. The main pump is connected to a main control valve. The pilot pump is connected via a pilot oil supply valve to a pilot handle and a three-way solenoid valve arranged in parallel. The pilot handle is connected to the main control valve. The main control valve is connected via a central rotating body to a first outrigger cylinder, a second outrigger cylinder, and a bulldozer blade cylinder arranged in parallel. Hydraulic locks are provided on the oil lines between the first outrigger cylinder, the second outrigger cylinder, the bulldozer blade cylinder, and the main control valve. The three-way solenoid valve is connected to the hydraulic locks via the central rotating body.
2. The hydraulic system for controlling the movement of the outriggers and bulldozer blades according to claim 1, characterized in that: The triple solenoid valve includes solenoid valve one, solenoid valve two, and solenoid valve three arranged in parallel. Solenoid valve one, solenoid valve two, and solenoid valve three are all connected to the corresponding hydraulic locks via the central rotating body.
3. The hydraulic system for controlling the movement of the outriggers and bulldozer blades according to claim 1 or 2, characterized in that: The triple solenoid valve is equipped with hydraulic lock one, hydraulic lock two, and hydraulic lock three for the first outrigger cylinder, the second outrigger cylinder, and the bulldozer blade cylinder, respectively. The main control valve is connected to the corresponding first outrigger cylinder, the second outrigger cylinder, and the bulldozer blade cylinder through hydraulic lock one, hydraulic lock two, and hydraulic lock three, respectively.
4. The hydraulic system for controlling the movement of the outriggers and bulldozer blades according to claim 1, characterized in that: Both the main pump and the pilot pump are driven by an engine, and both are connected to a hydraulic oil tank.
5. The hydraulic system for controlling the movement of the outriggers and bulldozer blades according to claim 4, characterized in that: The main control valve, the pilot handle, the triple solenoid valve, and the pilot oil supply valve are all connected to the hydraulic oil tank through a return oil circuit, and the main pump is connected to the hydraulic oil tank through a drain oil circuit.
6. The hydraulic system for controlling the movement of the outriggers and bulldozer blades according to claim 5, characterized in that: The main control valve is equipped with a return oil filter on its return oil circuit.
7. The hydraulic system for controlling the movement of the outriggers and bulldozer blades according to claim 6, characterized in that: The main control valve has a second check valve on its return oil circuit, and the second check valve is located between the main control valve and the return oil filter.
8. The hydraulic system for controlling the movement of the outriggers and bulldozer blades according to claim 6, characterized in that: A check valve and a radiator are connected in series in the return oil circuit of the main control valve, and the check valve and the radiator are located between the main control valve and the return oil filter.
9. The hydraulic system for controlling the movement of the outriggers and bulldozer blades according to claim 2, characterized in that: Solenoid valve one, solenoid valve two, and solenoid valve three are all connected to rocker switches, which are used to control the on / off state of the corresponding solenoid valve one, solenoid valve two, or solenoid valve three.
10. A wheeled excavator, characterized in that, include: The hydraulic system for controlling the movement of the outriggers and bulldozer blades as described in any one of claims 1-9.