Single-pump multi-system control loop for loading machine

Abstract

The utility model relates to the technical field of engineering machinery loaders, and discloses a single-pump multi-system control loop for a loader, which comprises a hydraulic oil tank and a working pump, the working pump is connected with an oil outlet of the hydraulic oil tank, an oil distribution block is arranged at the output end of the working pump, one output end of the oil distribution block is fixedly connected with a priority valve, and the other output end of the oil distribution block is fixedly connected with a control valve. The priority valve is connected with a working device hydraulic system through a pipeline, the other output end of the priority valve is provided with a first oil way, and the first oil way comprises a motor flow control valve, a constant displacement motor, a radiator and an oil return filter. According to the hydraulic system, through the priority function of the priority valve, on the premise that the requirement for a constant displacement motor is met by the Ls feedback loop, the requirement for supplying oil to a hydraulic system of a working device is met, the flow requirement of the whole system is met by increasing the displacement of a working pump, and the problem that gear pumps of an existing system are too many is solved through the oil distribution block and the priority valve; meanwhile, the cost of the whole machine is reduced, the energy consumption of the whole machine is reduced, and the problem of tedious installation is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery loaders, in particular to a single-pump multi-system control loop for loaders. Background Art

[0002] A loader is a type of heavy equipment widely used in industries such as construction, mining, agriculture, and waste disposal. It is mainly used for loading loose materials such as soil, sand, gravel, coal, etc., as well as for light excavation. A loader is usually equipped with a wide bucket installed at the front end of the vehicle and driven by a hydraulic system. It can efficiently complete the loading, handling, and unloading tasks of materials. The loader includes an engine, transmission system, operator's cab, front loader, hydraulic system, chassis, wheels, braking system, and auxiliary equipment. In the hydraulic system, one or more hydraulic pumps simultaneously provide power for multiple functions or working devices, thereby improving the operating efficiency and versatility of the loader.

[0003] There are still some problems in the use of the existing loader multi-system control loop. When a loader needs multiple different system configurations, multiple pumps are needed, which requires the whole machine to provide more gear pump installation ports and larger installation space. Adding different pumps will increase the corresponding cost, and the installation will be more cumbersome. Different pumps are used for different systems. Such a system design is too simple. It is just a superposition and combination of different systems. The more pumps installed, the higher the energy consumption of the whole machine. Therefore, those skilled in the art provide a single-pump multi-system control loop for a loader to solve the problems raised in the above background technology. Utility Model Content

[0004] The purpose of the present utility model is to solve the shortcomings existing in the prior art, and a single-pump multi-system control loop for a loader is proposed, which appropriately increases the displacement of the working pump and adds an oil distributor block at the oil outlet of the working pump. One oil channel is led to the pilot oil supply valve to provide pilot control oil to the hydraulic system of the working device, and one oil channel is led to the priority valve. Through the priority function of the priority valve, the Ls feedback loop is used to meet the oil supply to the hydraulic system of the working device on the premise of meeting the given amount of the motor, and the displacement of the working pump is increased to meet the flow demand of the entire system. An oil distributor block and a priority valve are added to reduce the problem of too many gear pumps in the existing system. At the same time, it can reduce the high cost of the whole machine, reduce the high energy consumption of the whole machine, and solve the problem of cumbersome installation.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a single-pump multi-system control circuit for a loader, comprising a hydraulic oil tank and a working pump, the working pump being connected to the oil outlet of the hydraulic oil tank, an oil separator being provided at the output end of the working pump, one output end of the oil separator being fixedly connected to a priority valve, the priority valve being connected to the hydraulic system of the working device through a pipeline, a first oil circuit being provided at the other output end of the priority valve, the first oil circuit comprising a motor flow control valve, a quantitative motor, a radiator and a return oil filter, the motor flow control valve being connected to the hydraulic oil tank through the quantitative motor, the radiator and the return oil filter, a second oil circuit being provided at the other output end of the oil separator, the second oil circuit comprising a pilot oil supply valve and an electric proportional valve, the oil separator being connected to the input end of the motor flow control valve through the pilot oil supply valve and the electric proportional valve;

[0006] Through the above technical solution, oil is led to the priority valve. Through the priority function of the priority valve, the Ls feedback loop satisfies the given amount of the motor and then supplies oil to the hydraulic system of the working device. The displacement of the working pump is increased to meet the flow demand of the entire system. An oil distributor and a priority valve are added to reduce the problem of too many gear pumps in the existing system. At the same time, the high cost of the whole machine, the high energy consumption of the whole machine, and the problem of complicated installation can be solved.

[0007] Furthermore, a fan is provided on one side of the radiator;

[0008] Through the above technical solution, the heat emitted by the radiator is blown out by the fan.

[0009] Furthermore, the output end of the pilot oil supply valve is further provided with a third oil circuit, the third oil circuit includes a pilot valve, and the pilot oil supply valve is connected to the hydraulic system of the working device through the pilot valve;

[0010] Through the above technical solution, the oil is led to the pilot oil supply valve through one channel to provide pilot control oil to the hydraulic system of the working device.

[0011] The utility model has the following beneficial effects:

[0012] 1. In the utility model, the single-pump multi-system control circuit for the loader appropriately increases the displacement of the working pump and adds an oil distributor at the oil outlet of the working pump. One oil channel is led to the pilot oil supply valve to provide pilot control oil to the hydraulic system of the working device, and another oil channel is led to the priority valve. Through the priority function of the priority valve, the Ls feedback loop satisfies the requirement of the given motor and then supplies oil to the hydraulic system of the working device. The displacement of the working pump is increased to meet the flow demand of the entire system. An oil distributor and a priority valve are added to reduce the problem of too many gear pumps in the existing system, while reducing the high cost of the entire machine, reducing the high energy consumption of the entire machine, and solving the problem of complicated installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of a single-pump multi-system control circuit for a loader proposed in the utility model;

[0014] Figure 2 This is a flow chart of a single-pump multi-system control loop for a loader proposed in the present invention.

[0015] Legend:

[0016] 1. Hydraulic oil tank; 2. Working pump; 3. Pilot oil supply valve; 4. Electric proportional valve; 5. Motor flow control valve; 6. Fixed displacement motor; 7. Fan; 8. Radiator; 9. Return oil filter; 10. Priority valve; 11. Pilot valve; 12. Working device hydraulic system; 13. Oil distributor. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] Reference Figure 1-2 , the utility model provides an embodiment: a single pump multi-system control circuit for a loader, including a hydraulic oil tank 1 and a working pump 2, the working pump 2 is connected to the oil outlet of the hydraulic oil tank 1, the output end of the working pump 2 is provided with an oil separator 13, one output end of the oil separator 13 is fixedly connected to a priority valve 10, the priority valve 10 is connected to a working device hydraulic system 12 through a pipeline, the other output end of the priority valve 10 is provided with a first oil circuit, the first oil circuit includes a motor flow control valve 5, a quantitative motor 6, a radiator 8 and a return oil filter 9, the motor flow control valve 5 is connected to the hydraulic oil tank 1 through the quantitative motor 6, the radiator 8 and the return oil filter 9, the other output end of the oil separator 13 is provided with a second Oil circuit, the second oil circuit includes a pilot oil supply valve 3 and an electric proportional valve 4, and the oil distribution block 13 is connected to the input end of the motor flow control valve 5 through the pilot oil supply valve 3 and the electric proportional valve 4. The return oil filter 9 is arranged inside the hydraulic oil tank 1 through an oil pipe, and the oil is led to the priority valve 10. Through the priority function of the priority valve 10, through the Ls feedback loop, on the premise of meeting the given amount of the motor 6, the oil supply to the working device hydraulic system 12 is met, and the displacement of the working pump 2 is increased to meet the flow demand of the entire system. An oil distribution block 13 and a priority valve 10 are added to reduce the problem of too many gear pumps in the existing system, and at the same time can reduce the high cost of the whole machine, reduce the high energy consumption of the whole machine, and solve the problem of cumbersome installation.

[0019] A fan 7 is provided on one side of the radiator 8 to blow out the heat emitted by the radiator 8 through the fan 7. The return oil filter 9 is connected to the radiator 8 through a pipe to facilitate the connection of the oil circuit.

[0020] A third oil circuit is also provided at the output end of the pilot oil supply valve 3. The third oil circuit includes a pilot valve 11. The pilot oil supply valve 3 is connected to the working device hydraulic system 12 through the pilot valve 11. The oil is led to the pilot oil supply valve 3 through one path to provide pilot control oil to the working device hydraulic system 12.

[0021] Working principle: By appropriately increasing the displacement of the working pump 2 and adding an oil distributor 13 to the oil outlet of the working pump 2, one oil channel is led to the pilot oil supply valve 3 to provide pilot control oil to the working device hydraulic system 12, and one oil channel is led to the priority valve 10. Through the priority function of the priority valve 10, the Ls feedback loop satisfies the given amount of the motor 6 and then supplies oil to the working device hydraulic system 12. The displacement of the working pump 2 is increased to meet the flow demand of the entire system. An oil distributor 13 and a priority valve 10 are added to reduce the problem of too many gear pumps in the existing system. At the same time, it can reduce the high cost of the whole machine, reduce the high energy consumption of the whole machine, and solve the problem of cumbersome installation.

[0022] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A single-pump multi-system control circuit for a loader, comprising a hydraulic oil tank (1) and a working pump (2), wherein the working pump (2) is connected to the oil outlet of the hydraulic oil tank (1), and is characterized in that: The output end of the working pump (2) is provided with an oil separator (13), one of the output ends of the oil separator (13) is fixedly connected to a priority valve (10), and the priority valve (10) is connected to a working device hydraulic system (12) through a pipeline. The other output end of the priority valve (10) is provided with a first oil circuit, and the first oil circuit includes a motor flow control valve (5), a quantitative motor (6), a radiator (8) and a return oil filter (9). The motor flow control valve (5) is connected to the hydraulic oil tank (1) through the quantitative motor (6), the radiator (8) and the return oil filter (9). The other output end of the oil separator (13) is provided with a second oil circuit, and the second oil circuit includes a pilot oil supply valve (3) and an electric proportional valve (4). The oil separator (13) is connected to the input end of the motor flow control valve (5) through the pilot oil supply valve (3) and the electric proportional valve (4).

2. The single-pump multi-system control circuit for a loader according to claim 1, characterized in that: A fan (7) is provided on one side of the radiator (8).

3. The single-pump multi-system control circuit for a loader according to claim 1, characterized in that: The output end of the pilot oil supply valve (3) is further provided with a third oil circuit, the third oil circuit including a pilot valve (11), and the pilot oil supply valve (3) is connected to the working device hydraulic system (12) via the pilot valve (11).

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