Electric proportional speed regulating valve

Abstract

The utility model provides an electric proportional speed regulating valve, and belongs to the technical field of hydraulic pressure. The hydraulic speed regulating valve solves the problems that an existing hydraulic speed regulating valve is low in integration level and poor in power connection coherence during speed regulation. The electric proportional speed regulating valve comprises a valve body, a safety valve, an unloading valve and an electric proportional throttle valve for controlling flow output of a working flow path are arranged in the valve body, the electric proportional throttle valve and the safety valve are inserted in the same side of the valve body, and the unloading valve is provided with an oil inlet cavity located under the safety valve and a spring cavity located under the electric proportional throttle valve. The oil return flow path is provided with an oil return section which is located between the safety valve and the electric proportional throttle valve and communicated with the safety valve, the unloading valve is arranged on the oil return section in a penetrating mode, the oil inlet flow path is provided with an oil passing section which is located between the oil inlet cavity and the safety valve and communicated with the oil inlet cavity and the safety valve, and the working flow path is provided with a feedback section which is located between the spring cavity and the electric proportional throttle valve and communicated with the spring cavity and the electric proportional throttle valve. The electric proportional speed regulating valve has the advantages of being high in integration level and good in power connection coherence during speed regulation.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulics and relates to an electro-hydraulic proportional speed control valve. Background Art

[0002] The function of a hydraulic speed control valve is to keep the flow rate of hydraulic oil at a set value and not change with the variation of external load, thereby playing a role in regulating the movement speed of an actuator. Some agricultural machines in the current market, such as the reel of a rice harvester, adopt a hydraulic speed control valve to eliminate the influence of load variation on the reel rotation speed.

[0003] Existing hydraulic speed control valves, such as a hydraulic speed control valve with a safety device previously applied by the applicant, include a valve body, a constant differential overflow valve chamber, and a throttle valve chamber. The constant differential overflow valve chamber has an oil inlet valve chamber and an oil return valve chamber. A safety valve connecting the oil inlet valve chamber and the oil return valve chamber is further arranged in the valve body. The safety valve includes a safety valve chamber located on one side of the constant differential overflow valve chamber. The safety valve chamber is arranged in parallel with the constant differential overflow valve chamber and the throttle valve chamber respectively.

[0004] The throttle valve is a flow control element. The throttle valve adopted by the above-mentioned hydraulic speed control valve with a safety device needs to be manually adjusted. However, the manual control method cannot accurately adjust the flow rate according to the actual working conditions, resulting in a problem of poor continuity of power connection during speed regulation. Moreover, the hydraulic components in the valve body are arranged in sequence along one direction of the valve body, and on this basis, the oil circuit is further arranged, resulting in a problem of low integration degree of the existing hydraulic speed control valve. Summary of the Invention

[0005] The purpose of the utility model is to address the above problems existing in the prior art and propose an electro-hydraulic proportional speed control valve to solve the technical problems of low integration degree of the existing speed control valve and poor continuity of power connection during speed regulation.

[0006] The purpose of the utility model can be achieved by the following technical solutions:

[0007] An electro-hydraulic proportional speed control valve includes a valve body having an oil inlet flow path, an oil return flow path, and a working flow path. A safety valve and a unloading valve that can both communicate with the oil inlet flow path and the oil return flow path are arranged in the valve body. It is characterized in that an electro-hydraulic proportional throttle valve for controlling the flow rate output of the working flow path is further arranged in the valve body. The electro-hydraulic proportional throttle valve and the safety valve are inserted on the same side of the valve body. The unloading valve has an oil inlet chamber located directly below the safety valve and a spring chamber located directly below the electro-hydraulic proportional throttle valve. The oil return flow path has an oil return section located between the safety valve and the electro-hydraulic proportional throttle valve and communicating with the safety valve. The unloading valve penetrates through the oil return section. The oil inlet flow path has an oil passage section located between the oil inlet chamber and the safety valve and connecting the two. The working flow path has a feedback section located between the spring chamber and the electro-hydraulic proportional throttle valve and connecting the two.

[0008] This speed control valve adopts an electro-hydraulic proportional throttle valve. The electro-hydraulic proportional throttle valve controls the opening of the spool according to an externally input signal to achieve stepless speed regulation of the flow rate of the working flow path, thereby improving the continuity of power connection during speed regulation. This speed control valve also arranges the electro-hydraulic proportional throttle valve and the safety valve on one side of the valve body. The oil inlet cavity is arranged directly below the safety valve, and the spring cavity is arranged directly below the electro-hydraulic proportional throttle valve. On this basis, an oil passage section that connects the oil inlet cavity and the safety valve is provided in the oil inlet flow path, that is, the oil flowing into the oil passage section can flow to the safety cavity and the unloading valve simultaneously. A feedback section that connects the spring cavity and the electro-hydraulic proportional throttle valve is provided in the working flow path, that is, the oil flowing out of the electro-hydraulic proportional throttle valve can enter the spring cavity through the feedback section, thereby reducing the layout length of the feedback flow path in the valve body. Among them, the safety valve prevents the oil pressure in the oil inlet flow path from being too high, and the unloading valve further prevents the oil pressure in the oil inlet flow path from being too high through the oil pressures of the oil inlet flow path and the working flow path. When the pressure of the oil inlet flow path exceeds the set value of the unloading valve or the safety valve, the oil is unloaded through the oil return section. The oil return section is arranged between the safety valve and the electro-hydraulic proportional throttle valve, so that the unloading oil paths of the safety valve and the unloading valve are integrated, reducing the number of oil paths arranged in the valve body and the layout length of the oil paths, thereby improving the integration degree of the speed control valve.

[0009] In the above electro-hydraulic proportional speed control valve, an installation cavity one for inserting the safety valve and an installation cavity two for inserting the electro-hydraulic proportional throttle valve are provided on the upper side of the valve body. An installation cavity three that penetrates through the left and right sides and through which the unloading valve passes is also provided on the valve body. The installation cavity three is located below the installation cavity one and the installation cavity two. The electro-hydraulic proportional throttle valve, the safety valve, and the unloading valve are located on the same cross-section of the valve body. This structure makes the arrangement of hydraulic components in the valve body compact and conforms to the flow path of the oil circuit.

[0010] In the above electro-hydraulic proportional speed control valve, the oil return flow path also has a return port that extends horizontally from the front side of the valve body to the installation cavity three. The installation cavity one and the installation cavity two are arranged in parallel, and the oil return section is communicated with the installation cavity three. This structure integrates the oil return paths of the safety valve and the unloading valve, shortens the path and quantity of the oil return flow path, and on the other hand reduces the processing difficulty of the oil return flow path in the valve body.

[0011] In the above electro-hydraulic proportional speed control valve, the oil inlet flow path also has an oil inlet that extends horizontally from the front side of the valve body to the oil passage section. The oil inlet flow path also has an oil supply section that communicates the oil inlet and the installation cavity two. The layout of the oil inlet flow path is reasonable, making full use of the space in the valve body.

[0012] In the above electro-hydraulic proportional speed control valve, the working flow path also has a working port that extends horizontally from the front side of the valve body to the feedback section. A damping hole that communicates the working port and the spring cavity is provided in the feedback section. This structure reduces the processing difficulty of the working flow path, and the damping hole prevents the oil pressure in the working flow path from impacting the unloading valve.

[0013] In the above-mentioned electro-hydraulic proportional speed control valve, the feedback section has a first communication hole communicating with the second installation cavity and a second communication hole communicating with the spring cavity. The aperture of the first communication hole is smaller than the cross-sectional area of the second installation cavity, and the aperture of the first communication hole is larger than that of the second communication hole. The first communication hole communicates with the working port. A damping member is screwed in the second communication hole, and the damping member has the above-mentioned damping hole. The cross-sectional area from the second installation cavity to the feedback section decreases from large to small; the setting of the damping member avoids directly machining the damping hole on the valve body, and the damping member is convenient to install, and this structure reduces the overall machining difficulty of the oil circuit in the valve body.

[0014] In the above-mentioned electro-hydraulic proportional speed control valve, the first communication hole is a cylindrical hole, and the aperture of the first communication hole is larger than the cross-sectional area of the working port. The second communication hole is a conical hole, and the aperture of the second communication hole gradually decreases along the axial direction from the first communication hole. The oil in the first communication hole can smoothly enter the working port. On the one hand, the second communication hole reduces the impact of the oil on the damping member, and on the other hand, the gradually shrinking aperture of the second communication hole improves the installation stability of the damping member and the sealing performance between the damping member and the second communication hole.

[0015] In the above-mentioned electro-hydraulic proportional speed control valve, the length of the second communication hole is greater than the length of the damping member. The side of the damping member facing the first communication hole has an internal hexagonal hole, and the damping hole penetrates through the other side of the damping member from the bottom of the internal hexagonal hole. Insert an existing tool with an internal hexagonal rod into the internal hexagonal hole, and the position of the damping member installed in the second communication hole can be adjusted. The damping hole is opened at the bottom of the internal hexagonal hole. On the one hand, the machining length of the damping hole is shortened, and on the other hand, the internal hexagonal hole avoids the sudden change of the oil flow cross-sectional area to a certain extent, and reduces the impact of the oil in the first communication hole on the damping member.

[0016] In the above-mentioned electro-hydraulic proportional speed control valve, the unloading valve further has a control cavity facing the spring cavity. The unloading valve includes an unloading valve core with one end passing through the spring cavity and the other end passing through the control cavity. An oil passage hole communicating the oil inlet cavity and the control cavity is opened on the unloading valve core, and a spring is arranged in the spring cavity. This structure enables the oil in the oil inlet cavity to enter the control cavity through the oil passage hole, that is, the oil pressure at the oil inlet is real-time fed back to the control cavity, and the oil pressure at the working port is real-time fed back to the spring cavity. When the pressure in the control cavity exceeds the pressure value set by the spring, the unloading valve core moves, causing the oil inlet flow path to unload, so as to ensure the stable flow rate in the valve body.

[0017] Compared with the prior art, an electro-hydraulic proportional speed control valve provided by the present invention has the following advantages:

[0018] 1. This speed control valve uses an electro-hydraulic proportional throttle valve. The electro-hydraulic proportional throttle valve controls the opening of the spool according to an externally input signal to achieve stepless speed regulation of the working flow path, thereby improving the continuity of power connection during speed regulation.

[0019] 2. Based on the adjustment of the positions of the electro-hydraulic proportional throttle valve, safety valve, and unloading valve in the valve body, the positions of the oil inlet flow path, oil return flow path, and working flow path in the valve body are adjusted, reducing the number of oil circuit arrangements and the arrangement length of the oil circuits in the valve body, and improving the integration of the speed control valve.

[0020] 3. The oil pressure at the oil inlet is fed back to the control chamber in real time, and the oil pressure at the working port is fed back to the spring chamber in real time. When the pressure in the oil inlet chamber exceeds the spring force of the spring in the spring chamber, the unloading spool moves, causing the oil inlet chamber to communicate with the oil return section until the pressure difference between the two ends is rebalanced and the unloading spool resets, ensuring the stability of the flow rate in the valve body. Description of the Drawings

[0021] Figure 1 is a sectional view of this electro-hydraulic proportional speed control valve Figure 1 .

[0022] Figure 2 is Figure 1 an enlarged view of part A in

[0023] Figure 3 is a sectional view of this electro-hydraulic proportional speed control valve Figure 2 .

[0024] Figure 4 is the front view of this electro-hydraulic proportional speed control valve.

[0025] Figure 5 is the left view of this electro-hydraulic proportional speed control valve.

[0026] Figure 6 is the schematic diagram of this electro-hydraulic proportional speed control valve..

[0027] In the figure, 1. Valve body; 11. Oil inlet flow path; 111. Oil passage section; 112. Oil supply section; 12. Oil return flow path; 121. Oil return section; 13. Working flow path; 131. Feedback section; 132. First communication hole; 133. Second communication hole; 14. Installation cavity one; 15. Installation cavity two; 16. Installation cavity three; 2. Safety valve; 3. Unloading valve; 31. Oil inlet chamber; 32. Spring chamber; 33. Control chamber; 34. Unloading spool; 341. Oil through hole; 35. Spring; 4. Electro-hydraulic proportional throttle valve; 5. Damping hole; 6. Damping part; 61. Hexagon socket head cap screw hole; P. Oil inlet; T. Return port; A. Working port. Detailed Implementation Manner

[0028] The following are specific embodiments of the present utility model and, in conjunction with the accompanying drawings, the technical solutions of the present utility model will be further described, but the present utility model is not limited to these embodiments.

[0029] As Figure 1 and Figure 6 shown, this electro-hydraulic proportional speed control valve includes a valve body 1 having an oil inlet flow path 11, a working flow path 13, and an oil return flow path 12. A safety valve 2 and a unloading valve 3 are provided in the valve body 1. Both the safety valve 2 and the unloading valve 3 can communicate the oil inlet flow path 11 and the oil return flow path 12. An electro-hydraulic proportional throttle valve 4 for controlling the flow output of the working flow path 13 is also provided in the valve body 1. The electro-hydraulic proportional throttle valve 4 and the safety valve 2 are both inserted on the same side of the valve body 1, and the unloading valve 3 is inserted on the other side of the valve body 1. The unloading valve 3 has an oil inlet chamber 31 directly below the safety valve 2 and a spring chamber 32 directly below the electro-hydraulic proportional throttle valve 4. The oil return flow path 12 has an oil return section 121 located between the safety valve 2 and the electro-hydraulic proportional throttle valve 4 and communicating with the safety valve 2. The unloading valve 3 passes through the oil return section 121. The oil inlet flow path 11 has an oil passage section 111 located between the oil inlet chamber 31 and the safety valve 2 and connecting the two. The working flow path 13 has a feedback section 131 located between the spring chamber 32 and the electro-hydraulic proportional throttle valve 4 and connecting the two.

[0030] An installation cavity one 14 for inserting the safety valve 2 and an installation cavity two 15 for inserting the electro-hydraulic proportional throttle valve 4 are provided on the upper side of the valve body 1. An installation cavity three 16 penetrating through the left and right sides and for the unloading valve 3 to pass through is also provided on the valve body 1. The installation cavity three 16 is located below the installation cavity one 14 and the installation cavity two 15. The electro-hydraulic proportional throttle valve 4, the safety valve 2, and the unloading valve 3 are located on the same cross-section of the valve body 1. The unloading valve 3 also has a control cavity 33 facing the spring chamber 32. The unloading valve 3 includes a unloading valve core 34 with one end inserted into the spring chamber 32 and the other end inserted into the control cavity 33. An oil passage hole 341 communicating the oil inlet chamber 31 and the control cavity 33 is provided on the unloading valve core 34. A spring 35 is provided in the spring chamber 32. The unloading valve core 34 passes through the installation cavity three 16 such that the installation cavity three 16 is divided into a control cavity 33, an oil inlet chamber 31, and a spring chamber 32. This structure uses the valve body 1 as the valve body of the unloading valve 3, improving the integration degree of the valve body 1.

[0031] As Figure 1 shown, the oil return flow path 12 also has a return port T extending horizontally from the front side of the valve body 1 to the installation cavity three 16. As Figure 4 and Figure 5 shown, the installation cavity one 14 and the installation cavity two 15 are arranged in parallel, and the oil return section 121 communicates with the installation cavity three 16; the oil inlet flow path 11 also has an oil inlet port P extending horizontally from the front side of the valve body 1 to the oil passage section 111. As Figure 3As shown, an oil supply section 112 communicating with the second installation cavity 15 is provided on the inner wall of the oil inlet P; the working flow path 13 further has a working port A extending transversely from the front side of the valve body 1 to the feedback section 131.

[0032] As Figure 1 and Figure 2 shown, the feedback section 131 has a first communication hole 132 communicating with the second installation cavity 15 and a second communication hole 133 communicating with the spring cavity 32. The aperture of the first communication hole 132 is smaller than the cross-sectional area of the second installation cavity 15, and the aperture of the first communication hole 132 is larger than the aperture of the second communication hole 133. The first communication hole 132 communicates with the working port A. A damping member 6 is screwed into the second communication hole 133. The damping member 6 has a damping hole 5 communicating the working port A and the spring cavity 32. The first communication hole 132 is a cylindrical hole, and the aperture of the first communication hole 132 is larger than the cross-sectional area of the working port A. The second communication hole 133 is a conical hole, and the aperture of the second communication hole 133 gradually decreases along the axial direction from the first communication hole 132. The length of the second communication hole 133 is greater than the length of the damping member 6. The side of the damping member 6 facing the first communication hole 132 has an internal hexagonal hole 61, and the damping hole 5 penetrates through the other side of the damping member 6 from the bottom of the internal hexagonal hole 61.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0034] Although terms such as valve body 1, oil inlet flow path 11, oil passage section 111, oil supply section 112, oil return flow path 12, oil return section 121, working flow path 13, feedback section 131, first communication hole 132, second communication hole 133, first installation cavity 14, second installation cavity 15, third installation cavity 16, safety valve 2, unloading valve 3, oil inlet cavity 31, spring cavity 32, control cavity 33, unloading valve core 34, oil passage hole 341, spring 35, electro-hydraulic proportional throttle valve 4, damping hole 5, damping member 6, internal hexagonal hole 61, oil inlet P, return port T, working port A, etc. are used more in this article, the possibility of using other terms is not excluded. Using these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. An electro-hydraulic proportional speed control valve, comprising a valve body (1) having an oil inlet flow path (11), an oil return flow path (12) and a working flow path (13), wherein a safety valve (2) and a unloading valve (3) capable of connecting the oil inlet flow path (11) and the oil return flow path (12) are arranged in the valve body (1), and is characterized in that, An electro-hydraulic proportional throttle valve (4) for controlling the flow output of the working flow path (13) is also provided inside the valve body (1). The electro-hydraulic proportional throttle valve (4) and the safety valve (2) are inserted on the same side of the valve body (1). The unloading valve (3) has an oil inlet chamber (31) directly below the safety valve (2) and a spring chamber (32) directly below the electro-hydraulic proportional throttle valve (4). The oil return flow path (12) has an oil return section (121) located between the safety valve (2) and the electro-hydraulic proportional throttle valve (4) and communicating with the safety valve (2). The unloading valve (3) passes through the oil return section (121). The oil inlet flow path (11) has an oil passage section (111) located between the oil inlet chamber (31) and the safety valve (2) and connecting the two. The working flow path (13) has a feedback section (131) located between the spring chamber (32) and the electro-hydraulic proportional throttle valve (4) and connecting the two.

2. The electro-proportional speed control valve according to claim 1, wherein On the upper side of the valve body (1), there is a first installation cavity (14) for inserting the safety valve (2) and a second installation cavity (15) for inserting the electro-hydraulic proportional throttle valve (4). On the valve body (1), there is also a third installation cavity (16) passing through the left and right sides for the unloading valve (3) to pass through. The third installation cavity (16) is located below the first installation cavity (14) and the second installation cavity (15). The electro-hydraulic proportional throttle valve (4), the safety valve (2), and the unloading valve (3) are located on the same cross-section of the valve body (1).

3. The electro-proportional speed control valve according to claim 2, characterized in that, The oil return flow path (12) also has a return port (T) extending horizontally from the front side of the valve body (1) to the third installation cavity (16). The first installation cavity (14) and the second installation cavity (15) are arranged in parallel, and the oil return section (121) communicates with the third installation cavity (16).

4. The electro-proportional speed control valve according to claim 2 or 3, characterized in that, The oil inlet flow path (11) also has an oil inlet (P) extending horizontally from the front side of the valve body (1) to the oil passage section (111). The oil inlet flow path (11) also has an oil supply section (112) connecting the oil inlet (P) and the second installation cavity (15).

5. The electro-hydraulic proportional speed control valve according to any one of claims 2 to 3, characterized in that, The working flow path (13) also has a working port (A) extending horizontally from the front side of the valve body (1) to the feedback section (131). A damping hole (5) connecting the working port (A) and the spring chamber (32) is provided in the feedback section (131).

6. The electro-proportional speed control valve according to claim 5, wherein The feedback section (131) has a first communication hole (132) communicating with the second installation cavity (15) and a second communication hole (133) communicating with the spring chamber (32). The diameter of the first communication hole (132) is smaller than the cross-sectional area of the second installation cavity (15), and the diameter of the first communication hole (132) is larger than the diameter of the second communication hole (133). The first communication hole (132) communicates with the working port (A). A damping member (6) is screwed into the second communication hole (133), and the damping member (6) has the above-mentioned damping hole (5).

7. The electro-proportional speed control valve according to claim 6, wherein The first communication hole (132) is a cylindrical hole, and the diameter of the first communication hole (132) is larger than the cross-sectional area of the working port (A). The second communication hole (133) is a conical hole, and the diameter of the second communication hole (133) gradually decreases along the axial direction from the first communication hole (132).

8. The electro-proportional speed control valve according to claim 6 or 7, characterized in that, The length of the second communication hole (133) is greater than the length of the damping member (6). The side of the damping member (6) facing the first communication hole (132) has an internal hexagonal hole (61), and the damping hole (5) penetrates through the other side of the damping member (6) from the bottom of the internal hexagonal hole (61).

9. The electro-proportional speed control valve according to any one of claims 1-3, characterized in that, The unloading valve (3) further has a control chamber (33) facing the spring chamber (32). The oil inlet chamber (31) is located between the control chamber (33) and the spring chamber (32). The unloading valve (3) includes an unloading valve core (34) with one end disposed in the spring chamber (32) and the other end disposed in the control chamber (33). An oil passage hole (341) communicating the oil inlet chamber (31) and the control chamber (33) is formed in the unloading valve core (34), and a spring (35) is provided in the spring chamber (32).

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