Hydraulic control system with milling function and wheel excavator

Abstract

The utility model discloses a hydraulic control system with milling function and a wheel excavator, the hydraulic control system with milling function comprises a pilot pump and a main pump, the main pump is connected with a main control valve, the pilot pump is connected with a two-linkage solenoid valve and a pilot handle which are arranged in parallel, the first electromagnetic valve of the two-linkage electromagnetic valve and the pilot handle are both connected with a main control valve, the main control valve and the second electromagnetic valve of the two-linkage electromagnetic valve are both connected with a switching valve through a center rotary connector, and the switching valve is connected with a milling motor and a dozer blade oil cylinder which are arranged in parallel. The two electromagnetic valves are matched with the switching valve to conveniently achieve switching of actions of the milling motor and the dozer blade oil cylinder, so that the milling function is added to the wheel excavator, the structure is simple, a hydraulic control system is easy to operate, and accurate control over the functions of the wheel excavator can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of excavators, in particular to a hydraulic control system with a milling function and a wheeled excavator. Background Art

[0002] The basic functional configuration of existing wheeled excavators at home and abroad is boom, dipper arm, bucket, rotation, travel and bulldozer. For extended functions, the function valve plate is generally expanded through the main control valve of the hydraulic system, and different accessories are added to the working device to meet the required functional requirements.

[0003] For example, existing patent CN215926142U discloses a hydraulic system and excavator in which staggered hydraulic actuators mounted on the lower body share a common main control valve and associated control device. This improves the utilization of the main control valve and control device while reducing the total number of main control valves and control devices, thereby lowering costs. However, the lower body of a wheeled excavator is typically equipped with a bulldozer and outriggers. Due to space limitations and the center swivel joint, it is difficult to expand the lower body to include additional functions, such as milling. Utility Model Content

[0004] In order to overcome at least one of the defects described in the above-mentioned prior art, the purpose of the present utility model is to provide a hydraulic control system and a wheeled excavator with a milling function, which realizes the switching between the milling mode and the bulldozer mode through the cooperation of a two-way solenoid valve and a switching valve, thereby enabling the wheeled excavator to be equipped with a milling function.

[0005] The technical solution adopted by the present invention to solve the problem is:

[0006] A hydraulic control system with a milling function includes: a pilot pump and a main pump, the main pump is connected to a main control valve, the pilot pump is connected to a two-way solenoid valve and a pilot handle arranged in parallel, solenoid valve 1 of the two-way solenoid valve and the pilot handle are both connected to the main control valve, the main control valve and solenoid valve 2 of the two-way solenoid valve are both connected to a switching valve through a central rotary joint, and the switching valve is connected to a milling motor and a bulldozer cylinder arranged in parallel.

[0007] As a preferred embodiment, in the present invention, a hydraulic lock is provided on the oil circuit between the switching valve and the bulldozer cylinder.

[0008] As a preferred embodiment, in the present invention, a shuttle valve is provided at the front end of the main control valve, and the solenoid valve 1 of the two-way solenoid valve and the pilot handle are connected to the main control valve through the shuttle valve.

[0009] As a preferred embodiment, in the utility model, two main pumps and main control valves are provided in parallel and are connected accordingly, one main control valve is connected to the switching valve via a center rotary joint, the other main control valve is connected to the travel motor via a center rotary joint, and the other main control valve is connected to the pilot pump via a travel valve group, and the travel valve group is arranged in parallel with the two-way solenoid valve and the pilot handle.

[0010] As a preferred embodiment, in the present invention, the main pump and the pilot pump are both connected to the engine, and the engine drives the main pump and the pilot pump to start and extract hydraulic oil.

[0011] As a preferred embodiment, in the present invention, both the main pump and the pilot pump are connected to a hydraulic oil tank, and the engine drives the main pump and the pilot pump to start and extract the hydraulic oil in the hydraulic oil tank.

[0012] As a preferred embodiment, in the present invention, the main pump and the pilot pump are both connected to the hydraulic oil tank via an oil drain circuit, and the main control valve is connected to the hydraulic oil tank via an oil return circuit.

[0013] As a preferred embodiment, in the present utility model, a one-way valve is provided on the oil return circuit between the main control valve and the hydraulic oil tank.

[0014] As a preferred embodiment, in the present invention, a radiator is provided on the oil return circuit between the main control valve and the hydraulic oil tank, and the radiator is provided between the one-way valve and the hydraulic oil tank.

[0015] A wheeled excavator comprises the above-mentioned hydraulic control system with milling function.

[0016] The hydraulic control system with milling function and the wheeled excavator provided by the utility model have the following beneficial effects:

[0017] The two-way solenoid valve is set up in conjunction with the switching valve to facilitate the switching of the milling motor and the bulldozer cylinder action, thereby adding a milling function to the wheeled excavator. In addition, the structure is simple and the hydraulic control system is easy to operate, which can achieve precise control of the wheeled excavator functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a hydraulic control system with a milling function according to the present invention;

[0019] Figure 2 This is a control logic diagram of the hydraulic control system with milling function of the utility model.

[0020] The meanings of the reference numerals are as follows:

[0021] 1. Pilot pump; 2. Main pump; 3. Engine; 4. Main control valve; 5. Travel valve group; 6. Pilot handle; 7. Shuttle valve; 8. Two-way solenoid valve; 9. Center rotary joint; 10. Travel motor; 11. Switching valve; 12. Milling motor; 13. Hydraulic lock; 14. Bulldozer cylinder; 15. One-way valve 1; 16. Radiator; 17. One-way valve 2; 18. Hydraulic oil tank. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] The utility model provides a wheeled excavator having a walking function and a bulldozing function, so as to facilitate walking and bulldozing movements. In addition, the walking and bulldozing movements of the wheeled excavator are realized through a hydraulic control system.

[0026] In order to further expand the auxiliary functions of the wheeled excavator, the utility model adds a milling function to the wheeled excavator, and Figure 1 The utility model provides a hydraulic control system with a milling function, which is used in a wheeled excavator to control the start and switch of the milling action and other actions.

[0027] The hydraulic control system with milling function includes: a pilot pump 1 and a main pump 2, the main pump 2 is connected to a main control valve 4, the pilot pump 1 is connected to a two-way solenoid valve 8 and a pilot handle 6 arranged in parallel, the solenoid valve 1 of the two-way solenoid valve 8 and the pilot handle 6 are both connected to the main control valve 4, the main control valve 4 and the solenoid valve 2 of the two-way solenoid valve 8 are both connected to the switching valve 11 through a central rotary joint 9, and the switching valve 11 is connected to a milling motor 12 and a bulldozer cylinder 14 arranged in parallel.

[0028] The two-way solenoid valve 8 is arranged in conjunction with the switching valve 11 to facilitate the switching of the milling motor 12 and the bulldozer cylinder 14, thereby adding a milling function to the wheeled excavator. The structure is simple, the hydraulic control system is easy to operate, and precise control of the wheeled excavator function can be achieved.

[0029] Specifically, a hydraulic lock 13 is provided on the oil circuit between the switching valve 11 and the bulldozer cylinder 14. The opening and closing of the hydraulic lock 13 is used to realize whether the oil circuit of the bulldozer cylinder 14 is conductive, thereby controlling the action of the bulldozer cylinder 14.

[0030] A shuttle valve 7 is installed at the front end of the main control valve 4. Solenoid valve 1 of the two-way solenoid valve 8 and the pilot handle 6 are connected to the main control valve 4 through the shuttle valve 7. The shuttle valve 7 can select either the solenoid valve 1 of the two-way solenoid valve 8 or the pilot handle 6 to communicate with the main control valve 4, thereby controlling the switching direction of the main control valve 4 to achieve the switching between the milling and bulldozing modes.

[0031] In addition, two main pumps 2 and main control valves 4 are provided in parallel and are connected accordingly. One main control valve 4 is connected to the switching valve 11 via the center rotary joint 9, and the other main control valve 4 is connected to the travel motor 10 via the center rotary joint 9, and the other main control valve 4 is connected to the pilot pump 1 via the travel valve group 5. The travel valve group 5 is arranged in parallel with the two-way solenoid valve 8 and the pilot handle 6.

[0032] The arrangement of another set of main pumps 2 and main control valves 4 enables the switching system of the milling and bulldozing blades to be arranged in parallel with the traveling system, so that the traveling action can be performed synchronously when the milling or bulldozing action is performed.

[0033] Based on this, combined Figure 1 and Figure 2 The principle of the hydraulic control system with milling function of the present utility model is as follows:

[0034] The first main pump 2 delivers hydraulic oil to the front end of the first main control valve 4. When the two-way solenoid valve 8 is de-energized, the pilot pump 1 outputs pilot oil to the pilot control port of the first main control valve 4, which is transferred via the pilot handle 6 and shuttle valve 7. At this time, the switching valve 11 is connected to the bulldozer mode. The hydraulic oil is transmitted from the main control valve 4 to the lower frame from the upper platform via the center rotary joint 9. It passes through the switching valve 11 and the opened hydraulic lock 13 to enter the bulldozer cylinder 14, realizing the bulldozer movement. When the two-way solenoid valve 8 is energized, the pilot pump 1 outputs pilot oil to the two-way solenoid valve 8. The second solenoid valve of the two-way solenoid valve 8 is controlled by a rocker switch to switch the switching valve 11 to the milling mode. The pilot oil is transferred via the shuttle valve 7 of the first solenoid valve of the two-way solenoid valve 8 to the pilot control port of the first main control valve 4, controlling the switching of the first main control valve 4, thus completing the milling mode switch. Next, the hydraulic oil is transmitted from the upper platform to the lower frame via the central rotary joint 9, and enters the corresponding milling motor 12 through the switching valve 11, thereby realizing the milling action.

[0035] The other main pump 2 delivers hydraulic oil to the front end of the other main control valve 4. The pilot pump 1 outputs pilot oil to the travel valve group 5. The travel valve group 5 transmits the pilot oil to the pilot control port of the other main control valve 4 to control the switching of the other main control valve 4. The hydraulic oil is then transferred from the upper platform to the lower frame through the center rotary joint and enters the travel motor 10, thus realizing the travel action.

[0036] It is worth noting that the walking action can be carried out simultaneously with the milling action.

[0037] In addition, the main pump 2 and the pilot pump 1 are both connected to the engine 3, which drives the main pump 2 and the pilot pump 1 to start and pump hydraulic oil. The main pump 2 and the pilot pump 1 are both connected to the hydraulic oil tank 18, which the engine 3 drives the main pump 2 and the pilot pump 1 to start and pump hydraulic oil from the hydraulic oil tank 18.

[0038] The engine 3 is started, so that the main pump 2 draws hydraulic oil and delivers it to the front end of the main control valve 4. The pilot pump 1 draws hydraulic oil and delivers it to the travel valve group 5, the pilot handle 6 and the two-way solenoid valve 8, so as to facilitate the transmission of the pilot oil to the main control valve 4, thereby controlling the reversing of the main control valve 4, so as to realize the transmission of the hydraulic oil of the main control valve 4 to the corresponding cylinder or motor, thereby completing the corresponding action.

[0039] Both the main pump 2 and the pilot pump 1 are connected to the hydraulic oil tank 18 via a drain circuit, and the main control valve 4 is connected to the hydraulic oil tank 18 via a return circuit. The drain circuit improves the internal pressure of the main pump 2 and the pilot pump 1 and facilitates the recycling of the hydraulic oil. The return circuit facilitates the recycling of the hydraulic oil, reducing energy consumption and costs.

[0040] A one-way valve is provided on the oil return circuit between the main control valve 4 and the hydraulic oil tank 18. A radiator 16 is provided on the oil return circuit between the main control valve 4 and the hydraulic oil tank 18, and the radiator 16 is provided between the one-way valve and the hydraulic oil tank 18.

[0041] The return oil circuit between the main control valve 4 and the hydraulic oil tank 18 can be equipped with a second check valve 17. Alternatively, a first check valve 15 and a radiator 16 can be connected in series. Generally, when the hydraulic oil return pressure is low, the first check valve 15 opens, allowing the return oil to dissipate heat through the radiator 16 before being returned to the hydraulic oil tank 18. When the return oil pressure is high, the second check valve 17 can be opened simultaneously to synchronize the return oil, thereby preventing excessive oil pressure from damaging the piping system.

[0042] 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 hydraulic control system with milling function, characterized in that: include: A pilot pump and a main pump, the main pump is connected to a main control valve, the pilot pump is connected to a two-way solenoid valve and a pilot handle arranged in parallel, solenoid valve 1 of the two-way solenoid valve and the pilot handle are both connected to the main control valve, the main control valve and solenoid valve 2 of the two-way solenoid valve are both connected to a switching valve through a central rotary joint, and the switching valve is connected to a milling motor and a bulldozer cylinder arranged in parallel.

2. The hydraulic control system with milling function according to claim 1, characterized in that: A hydraulic lock is provided on the oil circuit between the switching valve and the bulldozer oil cylinder.

3. The hydraulic control system with milling function according to claim 1, characterized in that: A shuttle valve is provided at the front end of the main control valve, and the solenoid valve 1 of the two-way solenoid valve and the pilot handle are connected to the main control valve through the shuttle valve.

4. The hydraulic control system with milling function according to claim 1, characterized in that: The main pump and the main control valve are both provided in parallel and are connected correspondingly, one of the main control valves is connected to the switching valve via the center rotary joint, the other main control valve is connected to the travel motor via the center rotary joint, and the other main control valve is connected to the pilot pump via the travel valve group, and the travel valve group, the two-way solenoid valve and the pilot handle are all provided in parallel.

5. The hydraulic control system with milling function according to any one of claims 1 to 4, characterized in that: The main pump and the pilot pump are both connected to an engine, and the engine drives the main pump and the pilot pump to start and pump hydraulic oil.

6. The hydraulic control system with milling function according to claim 5, characterized in that: The main pump and the pilot pump are both connected to a hydraulic oil tank, and the engine drives the main pump and the pilot pump to start and extract the hydraulic oil in the hydraulic oil tank.

7. The hydraulic control system with milling function according to claim 6, characterized in that: The main pump and the pilot pump are both connected to the hydraulic oil tank via an oil drain circuit, and the main control valve is connected to the hydraulic oil tank via an oil return circuit.

8. The hydraulic control system with milling function according to claim 7, characterized in that: A one-way valve is provided on the oil return circuit between the main control valve and the hydraulic oil tank.

9. The hydraulic control system with milling function according to claim 8, characterized in that: A radiator is provided on the oil return circuit between the main control valve and the hydraulic oil tank, and the radiator is provided between the one-way valve and the hydraulic oil tank.

10. A wheeled excavator, characterized in that: include: A hydraulic control system with milling function as claimed in any one of claims 1 to 9.

Images