Load-sensitive hydraulic circuit oil extraction device

Abstract

The utility model provides a load-sensitive hydraulic circuit oil taking device, which relates to the technical field of hydraulic control and comprises an oil inlet and an oil outlet, and a reversing valve is arranged on an oil way between the oil inlet and the oil outlet. A throttling speed regulating valve is arranged on an oil path between the oil outlet and the reversing valve; the oil taking device further comprises a load sensitive system, the load sensitive system comprises a signal comparison shuttle valve, and the signal comparison shuttle valve is communicated with an oil way between the throttling speed regulating valve and the oil outlet. According to the load-sensitive hydraulic loop oil extraction device, the signal comparison shuttle valve compares the pressure difference of the two loops and outputs a signal to the pump, normal work of a system is guaranteed, standby pressure is low when the two loops do not work, energy is saved, it can be guaranteed that system flow supply is matched with requirements, the single pump can provide flow for multiple loops, and the service life of the system is prolonged. The device has the advantages of low power consumption, low failure rate and easiness in assembling the oil extraction device, is suitable for systems with small installation space or needing to be upgraded and modified, and does not need to be additionally provided with pumps.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic control, and more specifically to a load-sensitive hydraulic circuit oil extraction device. Background Art

[0002] In the process of sugarcane production, the most miserable part for farmers is the harvesting process. The emergence of harvesters has greatly liberated labor, greatly improved efficiency, and is not affected by windy and rainy weather. The comprehensive cost calculation is also much better than manual harvesting. However, the current level of mechanized operation of sugarcane harvesting in my country is not high. Usually before the harvesting operation, the sugarcane leaves in the planting field are burned by artificial fire, and then the sugarcane is fed into a cutting harvester with a cutting device to cut the harvestable sugarcane into short sugarcane segments of 200-250 mm. This type of harvester is mainly cutting-type. Although it has high work efficiency, the sugarcane harvested in this way is usually unqualified because of its high impurity rate, which requires manual later removal; compared with the segmented harvesting form, the whole-stalk sugarcane is more resistant to storage and has a low impurity rate. It is more popular with sugar factories, and the purchase price is relatively high, which is more in line with the interests of all parties. Therefore, the whole-stalk sugarcane harvester is selected for sugarcane harvesting. The hydraulic system of the existing whole-stalk sugarcane harvester has the disadvantages of high power consumption and high failure rate. Utility Model Content

[0003] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a load-sensitive hydraulic circuit oil extraction device, including an oil inlet and an oil outlet, a reversing valve is arranged on the oil circuit between the oil inlet and the oil outlet; a throttling speed regulating valve is arranged on the oil circuit between the oil outlet and the reversing valve; the oil extraction device also includes a load-sensitive system, the load-sensitive system includes a signal comparison shuttle valve, and the signal comparison shuttle valve is connected to the oil circuit between the throttling speed regulating valve and the oil outlet.

[0004] Furthermore, the signal comparison shuttle valve is connected to the external signal oil port and the signal output oil port respectively.

[0005] Furthermore, the reversing valve is a two-position two-way reversing valve. When the valve core of the two-position two-way reversing valve is in the first position, the oil is conducted to the oil outlet; when the valve core of the two-position two-way reversing valve is in the second position, the oil circuit between the oil inlet and the oil outlet is cut off.

[0006] Furthermore, an inlet check valve is provided on the oil circuit between the oil inlet and the reversing valve.

[0007] Furthermore, the reversing valve is a solenoid valve.

[0008] Compared with the prior art, the load-sensitive hydraulic circuit oil extraction device of the utility model has the following beneficial effects: the load-sensitive hydraulic circuit oil extraction device of the utility model compares the pressure difference between the two circuits through a signal comparison shuttle valve and outputs a signal to the pump to ensure the normal operation of the system. When the two circuits are not working, the standby pressure is low, which is more energy-saving and can ensure that the system flow supply matches the demand. The pressure / flow is adjusted according to demand. A single pump can provide flow to multiple circuits. It has the advantages of low power consumption, low failure rate, and easy equipment of the oil extraction device. It is suitable for systems with small installation space or that need to be upgraded and modified without the need for additional pumps; the load-sensitive hydraulic circuit oil extraction device is provided with an inlet check valve as a conduction mechanism, which can prevent oil backflow and avoid pressure shock to the pump port; the load-sensitive hydraulic circuit oil extraction device is provided with a throttling speed regulating valve, the flow rate is not affected by the pressure difference, and the output flow is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0010] Figure 1 It is a structural schematic diagram of the load-sensitive hydraulic circuit oil extraction device of the utility model.

[0011] Figure 2 The schematic diagram of the structure of the electro-hydraulic system of the proportionally controlled whole-stalk sugarcane harvester.

[0012] Explanation of symbols in the figure:

[0013] 1. Engine; 2. Transfer case; 3. System working main pump; 4. System working valve; 5. Travel system pump; 6. Travel system control valve; 7. High and low speed switching valve; 8. Travel motor; 9. Load sensing circuit oil extraction device; 10. Rack action control valve; 11. Three-in-one radiator; 12. Top tip cutting pump; 13. Tip cutting control valve;

[0014] 901, reversing valve; 902, throttling speed regulating valve; 903, signal comparison shuttle valve; 904, inlet check valve; 905, oil inlet; 906, oil outlet; 907, signal output oil port; 908, external signal oil port. DETAILED DESCRIPTION

[0015] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] The load-sensitive hydraulic circuit oil extraction device provided by the embodiment of the utility model is now described. Figure 1 As shown, a load-sensitive hydraulic circuit oil extraction device includes an oil inlet 905 and an oil outlet 906. A reversing valve 901 is provided on the oil circuit between the oil inlet 905 and the oil outlet 906, a throttling speed regulating valve 902 is provided on the oil circuit between the oil outlet 906 and the reversing valve 901, and an inlet check valve 904 is provided on the oil circuit between the oil inlet 905 and the reversing valve 901. The reversing valve 901 is a solenoid valve, and the reversing valve 901 uses a two-position two-way reversing valve. When the valve core of the two-position two-way reversing valve is in the first position, the oil is conducted to the oil outlet 906, and the throttling speed regulating valve 902 ensures that the flow rate of the oil outlet 906 is constant and is not affected by the load or the pump shaft speed; when the valve core of the two-position two-way reversing valve is in the second position, the oil circuit between the oil inlet 905 and the oil outlet 906 is cut off, and the operation of other circuits is not affected.

[0017] The on-off of the oil circuit between the oil inlet 905 and the oil outlet 906 is determined by the reversing valve 901. The valve is controlled by the switch quantity. When the power is off, it is bidirectionally locked without leakage. After the power is on, the oil entering the oil inlet 905 passes through the throttling speed regulating valve 902 to limit the oil flow rate. At the same time, the setting of the reversing valve 901 can ensure the stability of the flow input and will not cause flow fluctuations due to changes in the pressure difference.

[0018] The oil extraction device also includes a load sensitive system, which includes a signal comparison shuttle valve 903, wherein the first end of the signal comparison shuttle valve 903 is connected to the external signal oil port 908, the second end of the signal comparison shuttle valve 903 is connected to the signal output oil port 907, and the third end of the signal comparison shuttle valve 903 is connected to the oil circuit between the throttling control valve 902 and the oil outlet 906.

[0019] The oil drives the load through the oil outlet 906. The generated pressure will be compared in the signal comparison shuttle valve 903 with the pressure of other circuits input through the external signal oil port 908. The higher pressure value will be output to the load sensitive valve of the pump through the signal output oil port 907. A decrease in the limit pressure indicates that the system needs more flow, and vice versa, it indicates that the system requires a decrease in flow.

[0020] The provision of the inlet check valve 904 can ensure that after the throttling speed regulating valve 902 is opened, the pressure shock will not enter the pump outlet through the oil circuit, thereby ensuring the service life of the pump.

[0021] The load-sensitive hydraulic circuit oil extraction device of the utility model compares the pressure difference between the two circuits through the signal comparison shuttle valve 903 and outputs a signal to the pump to ensure the normal operation of the system. When the two circuits are not working, the standby pressure is low, which is more energy-saving and can ensure that the system flow supply matches the demand. The pressure / flow is adjusted according to demand. A single pump can provide flow to multiple circuits. It has the advantages of low power consumption, low failure rate, and easy equipment of the oil extraction device. It is suitable for systems with small installation space or that need to be upgraded and modified without the need for additional pumps. The load-sensitive hydraulic circuit oil extraction device is provided with an inlet check valve 904 as a conduction mechanism, which can prevent oil backflow and avoid pressure shock to the pump port. The load-sensitive hydraulic circuit oil extraction device is provided with a throttling speed regulating valve 902, and the flow rate is not affected by the pressure difference, and the output flow is more stable.

[0022] The utility model discloses a load-sensitive hydraulic circuit oil extraction device which is applied to an electro-hydraulic system of a proportionally controlled whole-stalk sugarcane harvester.

[0023] like Figure 2 As shown, the proportionally controlled electro-hydraulic system of the whole-stalk sugarcane harvester includes an engine 1, a system working main pump 3, a system working hydraulic system, and a travel hydraulic system. The travel hydraulic system includes a travel system pump 5 and a travel motor 8. The travel system pump 5 is connected to the travel motors 8 corresponding to the left and right crawlers of the sugarcane harvester through a travel system control valve 6.

[0024] The engine 1 is connected to the system working main pump 3 and the travel system pump 5 through the transfer case 2, wherein the engine 1 provides the working power for the entire electro-hydraulic system by burning diesel. Since the sugarcane harvester needs to match the spacing between field ridges, the frame of the whole vehicle is very compact and the series pump cannot be installed, so the transfer case 2 is selected to reduce the overall size.

[0025] The system working main pump 3 is load sensitive and constant power controlled. It provides the required pressure and flow while limiting the overall power, which can ensure that the actuators of the main actions of the sugarcane harvester can work normally, and the engine 1 will not be shut down due to exceeding the system demand power.

[0026] The system working hydraulic system includes a system working valve 4, a sugarcane straightening motor, a sugarcane root cutting motor, a sugarcane conveying motor, and a stalk and leaf stripping motor. The system working main pump 3 is connected to the sugarcane straightening motor, the sugarcane root cutting motor, the sugarcane conveying motor, and the stalk and leaf stripping motor through the system working valve 4. The four connections of the system working valve 4 from left to right are respectively used to control the four actions of sugarcane straightening, sugarcane root cutting, sugarcane conveying, and stalk and leaf stripping. Each connection can realize independent proportional control and forward and reverse switching without interfering with each other. Among them, the sugarcane root cutting motor and sugarcane conveying motor corresponding to the two actions of sugarcane root cutting and stalk and leaf stripping use plunger motors with integrated reduction devices to match large torque and suitable speed. The sugarcane straightening motor, sugarcane root cutting motor, sugarcane conveying motor, and stalk and leaf stripping motor are equipped with speed sensors, pressure sensors, and controller components to intelligently adjust the output power to achieve the purpose of energy saving and emission reduction.

[0027] The travel system pump 5 has a load-sensitive function. The output flow and pressure are mainly supplied to the travel motors 8 corresponding to the left and right crawlers of the sugarcane harvester through the travel system control valve 6. The travel system control valve 6 is a proportional control multi-way valve that does not interfere with each other. Both valves can independently realize electro-hydraulic proportional action and forward and reverse switching operations. With the speed sensor, pressure sensor, inclination sensor and controller components, intelligent travel control can be realized to ensure travel speed matching and straightness. The addition of navigation and positioning algorithms in the later stage can realize automatic driving and unmanned harvesting.

[0028] A high-low speed switching valve 7 is connected between the travel motors 8 corresponding to the left and right tracks of the sugarcane harvester. The travel motor 8 uses a motor with dual speed and braking functions. When oil flows in, the motor releases the brake and starts to move. When a pressure signal is input, the motor switches to a high-speed and small-displacement mode, which is suitable for transfer work.

[0029] The travel hydraulic system also includes a load-sensitive circuit oil extraction device 9, which is connected to the travel system pump 5 and the travel system control valve 6 respectively. The load-sensitive circuit oil extraction device 9 is connected to the attachment lifting motor and the attachment pitching motor respectively through the frame motion control valve 10. In the travel system circuit, a portion of the oil is taken through the load-sensitive circuit oil extraction device 9 and supplied to the frame motion control valve 10 to control the frame motion, thereby controlling the left lift, right lift and overall pitch of the attachment installed on the frame. Because the frame adjustment is intermittent and the installation space is limited, the load-sensitive circuit oil extraction device 9 is selected. There is no energy consumption when the frame is not adjusted, and the energy-saving effect is obvious. The total power of the electro-hydraulic system is kept within the set range to prevent the engine 1 from stalling due to overpower. The load-sensitive circuit oil extraction device 9 cooperates with control components such as pressure sensors and speed sensors to realize the floating design of the cutter disc on the frame to ensure the harvesting effect.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A load-sensitive hydraulic circuit oil extraction device, characterized in that: It includes an oil inlet and an oil outlet, and a reversing valve is arranged on the oil circuit between the oil inlet and the oil outlet; a throttling speed regulating valve is arranged on the oil circuit between the oil outlet and the reversing valve; the oil extraction device also includes a load sensitive system, and the load sensitive system includes a signal comparison shuttle valve, and the signal comparison shuttle valve and the throttling speed regulating valve are connected to the oil circuit between the oil outlet.

2. The load-sensitive hydraulic circuit oil extraction device according to claim 1, characterized in that: The signal comparison shuttle valve is connected to the external signal oil port and the signal output oil port respectively.

3. The load-sensitive hydraulic circuit oil extraction device according to claim 2, characterized in that: The reversing valve is a two-position two-way reversing valve. When the valve core of the two-position two-way reversing valve is in the first position, the oil is conducted to the oil outlet; when the valve core of the two-position two-way reversing valve is in the second position, the oil path between the oil inlet and the oil outlet is cut off.

4. The load-sensitive hydraulic circuit oil extraction device according to claim 3, characterized in that: An inlet check valve is arranged on the oil circuit between the oil inlet and the reversing valve.

5. The load-sensitive hydraulic circuit oil extraction device according to claim 4, characterized in that: The reversing valve is a solenoid valve.

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