Hydraulic valve group for tractor

Abstract

The utility model provides a hydraulic valve group for a tractor, which comprises an oil recharging overflow valve, a manual throttle valve, a pressure compensation valve and an electromagnetic valve, the oil recharging overflow valve is respectively connected with the manual throttle valve, the pressure compensation valve and the electromagnetic valve through pipelines, and the manual throttle valve is connected with the pressure compensation valve through a pipeline. The application range of the rear-mounted machine tool of the tractor is enlarged, and the requirements under the corresponding working conditions can be met through flow and pilot control. The size of the opening area of the throttle valve is manually controlled so as to control the output flow. Through a compensation structure of the pressure compensation valve, constant pressure difference of an inlet and an outlet is achieved. The oil supplementing overflow valve mainly has two functions: firstly, the oil supplementing overflow valve is used for limiting the system pressure and preventing the pressure from being too high; and secondly, when the flow in the system is insufficient and negative pressure occurs, oil can be reversely supplemented into the system through a one-way valve in the oil supplementing overflow valve, and the negative pressure is prevented. The structure is simple and the cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor hydraulic systems, in particular to a hydraulic valve group for tractors. Background Art

[0002] The existing tractors usually control the rear implements by hydraulic lifting and rotation, and cannot achieve flow and pilot control. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a hydraulic valve group for a tractor in view of the deficiencies of the prior art.

[0004] The utility model solves the above-mentioned technical problem with the following technical solution: a hydraulic valve group for a tractor, comprising: an oil replenishing overflow valve, a manual throttle valve, a pressure compensating valve, and a solenoid valve; the oil replenishing overflow valve is respectively connected to the manual throttle valve, the pressure compensating valve, and the solenoid valve through pipelines; the manual throttle valve is connected to the pressure compensating valve through a pipeline.

[0005] The beneficial effects of adopting the technical solution of the utility model are: increasing the application range of the rear-mounted implements of the tractor, and meeting the requirements under the corresponding working conditions through flow and pilot control. The output flow rate is controlled by manually controlling the size of the throttle valve opening area. The constant pressure difference between the inlet and outlet is achieved through the compensation structure of the pressure compensation valve. The oil replenishment overflow valve has two main functions: first, it is used to limit the system pressure to prevent excessive pressure; second, when the flow in the system is insufficient and negative pressure occurs, the one-way valve in the oil replenishment overflow valve can be used to reversely replenish oil into the system to prevent negative pressure. The structure is simple and the cost is low.

[0006] Furthermore, the first end of the oil replenishment overflow valve is connected to the first end of the manual throttle valve, the first end of the pressure compensation valve, and the first end of the solenoid valve through pipelines, and the second end of the manual throttle valve is connected to the second end of the pressure compensation valve through a pipeline.

[0007] The beneficial effects of adopting the above further technical solution are: facilitating the connection and maintenance of various components and having a simple structure.

[0008] Furthermore, the oil replenishment relief valve is connected to an overload valve via a pipeline, and the overload valve is connected to the solenoid valve via a pipeline.

[0009] The beneficial effect of adopting the above further technical solution is that an overload valve is separately provided in the pilot control pressure system, and when the pressure is too high, the overload valve is opened to return oil to the T port to limit the continuous increase of pressure.

[0010] Furthermore, the second end of the oil replenishment relief valve is connected to the first end of the overload valve through a pipeline, and the second end of the solenoid valve and the third end of the solenoid valve are connected to the second end of the overload valve and the third end of the overload valve through pipelines respectively.

[0011] The beneficial effect of adopting the above further technical solution is that an overload valve is separately provided in the pilot control pressure system, and when the pressure is too high, the overload valve is opened to return oil to the T port to limit the continuous increase of the pressure. The connection and maintenance of each component are convenient, and the structure is simple.

[0012] Furthermore, a one-way valve is provided in the oil replenishment overflow valve.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that the oil-supply overflow valve has two main functions: first, it is used to limit the system pressure to prevent excessive pressure; second, when the flow in the system is insufficient and negative pressure occurs, oil can be reversely replenished into the system through the one-way valve in the oil-supply overflow valve to prevent negative pressure.

[0014] Furthermore, the pressure compensating valve is provided with a plurality of adjustment positions.

[0015] The beneficial effect of adopting the above further technical solution is: according to the size of the manual throttle valve opening area, the pressure compensation valve is in position a, b or c to control the flow output to the CF port, and the excess flow is output to other systems through the EF port.

[0016] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is one of the structural schematic diagrams of the hydraulic valve group for tractors provided in an embodiment of the utility model.

[0018] Figure 2 The second structural schematic diagram of the hydraulic valve group for tractors provided in the embodiment of the utility model.

[0019] Figure 3 The third structural schematic diagram of the hydraulic valve group for tractors provided in the embodiment of the utility model.

[0020] Figure 4 The fourth structural schematic diagram of the hydraulic valve group for tractors provided in the embodiment of the utility model.

[0021] Explanation of the accompanying figures: 1. Oil replenishment relief valve; 2. Manual throttle valve; 3. Pressure compensation valve; 4. Solenoid valve; 5. Overload valve. DETAILED DESCRIPTION

[0022] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0023] like Figures 1 to 4 As shown, an embodiment of the utility model provides a hydraulic valve group for a tractor, including: an oil replenishing overflow valve 1, a manual throttle valve 2, a pressure compensating valve 3, and a solenoid valve 4. The oil replenishing overflow valve 1 is connected to the manual throttle valve 2, the pressure compensating valve 3, and the solenoid valve 4 through pipelines, and the manual throttle valve 2 is connected to the pressure compensating valve 3 through a pipeline.

[0024] The beneficial effects of adopting the technical solution of the utility model are: increasing the application range of the rear-mounted implements of the tractor, and meeting the requirements under the corresponding working conditions through flow and pilot control. The output flow rate is controlled by manually controlling the size of the throttle valve opening area. The constant pressure difference between the inlet and outlet is achieved through the compensation structure of the pressure compensation valve. The oil replenishment overflow valve has two main functions: first, it is used to limit the system pressure to prevent excessive pressure; second, when the flow in the system is insufficient and negative pressure occurs, the one-way valve in the oil replenishment overflow valve can be used to reversely replenish oil into the system to prevent negative pressure. The structure is simple and the cost is low.

[0025] Among them, the manual throttle valve can improve the structure according to actual needs to achieve automatic control and adjustment. The arrows in the figure represent the flow direction and trajectory of the oil.

[0026] The utility model provides a tractor hydraulic valve group, which can be a tractor hydraulic valve group hydraulic system, and can achieve the needs under corresponding working conditions through flow and pilot control, providing a new design scheme for the next domestic and foreign market promotion.

[0027] 1. Through innovative design, the practical application of control valve group is realized.

[0028] 2. Manually control the opening area of ​​the throttle valve to control the output flow rate.

[0029] 3. Through the compensation structure of the pressure compensation valve, a constant pressure difference between the inlet and outlet can be achieved.

[0030] Furthermore, the first end of the oil replenishment overflow valve 1 is connected to the first end of the manual throttle valve 2, the first end of the pressure compensation valve 3, and the first end of the solenoid valve 4 through pipelines, and the second end of the manual throttle valve 2 is connected to the second end of the pressure compensation valve 3 through a pipeline.

[0031] The beneficial effects of adopting the above further technical solution are: facilitating the connection and maintenance of various components and having a simple structure.

[0032] like Figures 1 to 4 As shown, further, the oil replenishment relief valve 1 is connected to the overload valve 5 through a pipeline, and the overload valve 5 is connected to the solenoid valve 4 through a pipeline.

[0033] The beneficial effect of adopting the above further technical solution is that an overload valve is separately provided in the pilot control pressure system, and when the pressure is too high, the overload valve is opened to return oil to the T port to limit the continuous increase of pressure.

[0034] like Figures 1 to 4 As shown, further, the second end of the oil replenishment relief valve 1 is connected to the first end of the overload valve 5 through a pipeline, and the second end of the solenoid valve 4 and the third end of the solenoid valve 4 are connected to the second end of the overload valve 5 and the third end of the overload valve 5 through pipelines respectively.

[0035] The beneficial effect of adopting the above further technical solution is that an overload valve is separately provided in the pilot control pressure system, and when the pressure is too high, the overload valve is opened to return oil to the T port to limit the continuous increase of the pressure. The connection and maintenance of each component are convenient, and the structure is simple.

[0036] like Figures 1 to 4 As shown, further, a one-way valve is provided in the oil replenishment overflow valve 1.

[0037] The beneficial effect of adopting the above-mentioned further technical solution is that the oil-supply overflow valve has two main functions: first, it is used to limit the system pressure to prevent excessive pressure; second, when the flow in the system is insufficient and negative pressure occurs, oil can be reversely replenished into the system through the one-way valve in the oil-supply overflow valve to prevent negative pressure.

[0038] like Figures 1 to 4 As shown, further, the pressure compensation valve 3 is provided with a plurality of adjustment positions.

[0039] The beneficial effect of adopting the above further technical solution is: according to the size of the manual throttle valve opening area, the pressure compensation valve is in position a, b or c to control the flow output to the CF port, and the excess flow is output to other systems through the EF port.

[0040] Among them, the multiple adjustment positions can be positions a, b and c.

[0041] The hydraulic valve group for tractors provided in the embodiment of the utility model can be a system, and its main components include: an oil replenishment overflow valve 1, a manual throttle valve 2, a pressure compensation valve 3, a solenoid valve 4, an overload valve 5, etc.

[0042] This valve group (hydraulic valve group for tractors) consists of three parts: pressure limiting and oil replenishment hydraulic system, flow regulation hydraulic system, and pilot control hydraulic system. The specific control principle is as follows:

[0043] like Figure 2 As shown, 1.1 Pressure limitation and oil replenishment hydraulic system: In the valve group system (hydraulic valve group for tractors), the oil replenishment relief valve 1 has two main functions: first, it is used to limit the system pressure to prevent excessive pressure; second, when the flow in the system is insufficient and negative pressure occurs, oil can be replenished in the system in the reverse direction through the one-way valve in the oil replenishment relief valve 1 to prevent negative pressure.

[0044] like Figure 3 As shown, 1.2 Flow regulation hydraulic system: When the flow needs to be controlled, open the manual throttle valve 2, and the pressure oil passes through the manual throttle valve 2 from the P port to the pressure compensation valve 3. According to the size of the opening area of ​​the manual throttle valve 2, the pressure compensation valve 3 is in position a, b or c to control the flow output to the CF port, and the excess flow is output to other systems through the EF port.

[0045] like Figure 4 As shown, 1.3 pilot control hydraulic system: when the solenoid valve 4 is not energized, the pressure oil flows from the P port to the solenoid valve 4, which is at the left position of the valve core at this time, and the inlet of the solenoid valve 4 is in a closed state and has no action.

[0046] When the solenoid valve 4 is energized, the pressure oil flows from the P port to the solenoid valve 4, and then outputs to the control system through the PP port. An overload valve 5 is separately set in the pilot control pressure system. When the pressure is too high, the overload valve 5 is opened to return the oil to the T port to limit the continuous increase of pressure.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A hydraulic valve group for tractors, It is characterized in that include: An oil replenishment overflow valve, a manual throttle valve, a pressure compensating valve, and a solenoid valve. The oil replenishment overflow valve is respectively connected to the manual throttle valve, the pressure compensating valve, and the solenoid valve through pipelines, and the manual throttle valve is connected to the pressure compensating valve through a pipeline.

2. A hydraulic valve group for a tractor according to claim 1, It is characterized in that The first end of the oil replenishment overflow valve is connected to the first end of the manual throttle valve, the first end of the pressure compensation valve, and the first end of the solenoid valve through pipelines, and the second end of the manual throttle valve is connected to the second end of the pressure compensation valve through a pipeline.

3. A hydraulic valve group for a tractor according to claim 1, It is characterized in that The oil replenishment relief valve is connected to an overload valve through a pipeline, and the overload valve is connected to the solenoid valve through a pipeline.

4. A hydraulic valve assembly for a tractor according to claim 3, It is characterized in that The second end of the oil replenishment relief valve is connected to the first end of the overload valve through a pipeline, and the second end of the solenoid valve and the third end of the solenoid valve are connected to the second end of the overload valve and the third end of the overload valve through pipelines respectively.

5. A hydraulic valve assembly for a tractor according to claim 1, It is characterized in that A one-way valve is arranged in the oil replenishment overflow valve.

6. A hydraulic valve assembly for a tractor according to claim 1, It is characterized in that The pressure compensation valve is provided with a plurality of adjustment positions.

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