An improved buffer-type electro-hydraulic directional valve

Abstract

This invention discloses an improved buffer-type electro-hydraulic directional valve, comprising an electromagnetic directional valve and a hydraulically controlled directional valve. The electromagnetic directional valve has a first coil and a second coil respectively installed at its left and right ends. A second valve core is installed on one side of the first coil. A component B1 is installed at the bottom of the second valve core, and a hole b1 is provided at the bottom of component B1. A component P1 is installed on one side of component B1, and a component A1 is installed on one side of component P1. A hole a1 is provided at the bottom of component A1, and a component T1 is installed on one side of component A1. A hole a2 is connected to the bottom of hole a1, and a hole a3 is connected to one end of hole a1. A hole b3 is connected to one end of hole b1. An R-cavity is provided on the bottom side of hole b3, and the first valve core is installed on one side of the R-cavity. This invention achieves the effect of controlling the oil flow as the first valve core moves through the hydraulically controlled directional valve, gradually increasing the oil flow to control the first valve core, thus achieving a slow start and gradual acceleration effect during cylinder movement.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic directional valves, and particularly to an improved buffer-type electro-hydraulic directional valve. Background Technology

[0002] An electro-hydraulic directional valve is a hydraulically actuated directional valve integrated with a solenoid-operated pilot valve. The valve spool is actuated by pressurized oil in the control circuit. Electro-hydraulic and hydraulically controlled directional valves are mainly used in hydraulic systems where the flow rate exceeds the normal operating range of the solenoid directional valve, to control the movement of actuators or the direction of oil flow.

[0003] Existing hydraulic directional valves can only make the cylinder move at a fixed speed. If the oil flow is too large, the cylinder will move too fast and too violently. If the oil flow is too small, the cylinder will move slowly, but the remaining stroke of the valve core during the switching process will still be slow, resulting in low production efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide an improved buffer type electro-hydraulic directional valve.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] This invention discloses an improved buffer-type electro-hydraulic directional valve, comprising an electromagnetic directional valve and a hydraulically controlled directional valve. The electromagnetic directional valve has a first coil and a second coil respectively disposed at its left and right ends. A second valve core is mounted on one side of the first coil. A component B1 is mounted on the bottom end of the second valve core. A hole b1 is provided at the bottom end of component B1. A component P1 is mounted on one side of component B1. A component A1 is mounted on one side of component P1. A hole a1 is provided at the bottom end of component A1. A component T1 is mounted on one side of component A1. Damping plugs are mounted at the top ends of holes a1 and b1. Hole a2 is connected to the bottom end of hole a1. Hole a3 is connected to one end of hole a1. Hole b3 is connected to one end of hole b1. Hole b2 is connected to the bottom side of holes b3 and a3. A cavity R is provided on the bottom side of hole b3. A first valve core is mounted on one side of cavity R.

[0007] As a preferred embodiment of the present invention, components A1, B1, P1 and T1 are all process holes, and component A1 is connected to hole a1, and is also connected to holes a2 and a3 through hole a1.

[0008] As a preferred embodiment of the present invention, the internal structure of the hydraulic control directional valve is symmetrically arranged, with its a1, a2, and a3 holes being symmetrical to its b1, b2, and b3 holes.

[0009] As a preferred embodiment of the present invention, a sliding groove is provided between the first coil and the second coil, and the second valve core is disposed inside the sliding groove, wherein the second valve core and the sliding groove are slidably connected.

[0010] In a preferred embodiment of the present invention, the return springs are symmetrically arranged, with the return springs respectively located on the left and right sides of the hydraulic directional valve. A gasket is mounted on one end of each return spring, and the other end of the gasket is fitted into the first valve core.

[0011] As a preferred embodiment of the present invention, the bottom end of the hydraulic control directional valve is provided with five cylinder connection holes, and a cylinder is installed at the bottom end of the hydraulic control directional valve, and the cylinder connection holes are connected to the cylinder.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] This invention uses a hydraulically controlled directional valve to control the oil volume as the first valve core moves. This allows the oil volume of the first valve core to be gradually increased from a small value, enabling the cylinder to start slowly and accelerate gradually. The oil volume is controlled by holes a2 and b2, which gradually increase in size as the first valve core moves. This allows the oil volume to be controlled from a small value to a large value. When the first valve core 206 is reset, it can also quickly return to the middle position. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a cross-sectional structural schematic diagram of the present invention;

[0017] Figure 3 This is a magnified view of a partial structure of the present invention;

[0018] In the diagram: 1. Electromagnetic directional valve; 101. First coil; 102. Second coil; 103. Second valve core; 104. Component T1; 105. Component B1; 106. Component A1; 107. Component P1; 108. A1 hole; 109. B1 hole; 2. Hydraulic directional valve; 201. A2 hole; 202. A3 hole; 203. B2 hole; 204. B3 hole; 205. R chamber; 206. First valve core; 207. Return spring. Detailed Implementation

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] In the attached diagram, all identical reference numerals refer to the same components.

[0021] Example 1

[0022] like Figure 1-3 As shown, the present invention provides an improved buffer-type electro-hydraulic directional valve, including a solenoid directional valve 1 and a hydraulically controlled directional valve 2. A first coil 101 and a second coil 102 are respectively disposed at the left and right ends inside the solenoid directional valve 1. A second valve core 103 is installed on one side of the first coil 101. A component B1 105 is installed at the bottom end of the second valve core 103. A b1 hole 109 is provided at the bottom end of component B1 105. A component P1 107 is installed on one side of component B1 105. A component A1 106 is installed on one side of component P1 107. A a1 hole 108 is provided at the bottom end of component A1 106. A component T1 is installed on one side of component A1 106. 104, damping screw plugs are installed at the top of holes a1 108 and b1 109. The bottom end of hole a1 108 is connected to hole a2 201. One end of hole a1 108 is connected to hole a3 202. One end of hole b1 109 is connected to hole b3 204. The bottom end of hole b1 109 is connected to hole b2 203. Return springs 207 are installed on the bottom sides of holes b3 204 and a3 202. An R cavity 205 is provided on the bottom side of hole b3 204. A first valve core 206 is installed on one side of the R cavity 205.

[0023] Furthermore, components A1 106, B1 105, P1 107, and T1 104 are all process holes. Component A1 106 connects to hole a1 108 and, through hole a1 108, connects to holes a2 201 and a3 202. The internal arrangement of the hydraulic control directional valve 2 is symmetrical, with holes a1 108, a2 201, and a3 202 symmetrical to holes b1 109, b2 203, and b3 204. Hydraulic oil can flow through component A1 106 through holes a1, a2, and a3 202, while hydraulic oil can also flow through component B1 105 through holes b1 109, b2 203, and b3 204.

[0024] A sliding groove is provided between the first coil 101 and the second coil 102. The second valve core 103 is disposed inside the sliding groove. The second valve core 103 is slidably connected to the sliding groove. The second valve core 103 can slide inside the sliding groove to connect components A1106, B1105, P1107 and T1104.

[0025] The reset springs 207 are symmetrically arranged, and are respectively arranged on the left and right sides of the hydraulic control directional valve 2. One end of the reset spring 207 is equipped with a gasket, and the other end of the gasket is attached to the first valve core 206. The reset springs 207 are used to help the first valve core 206 reset.

[0026] The bottom end of the hydraulic directional valve 2 is provided with five cylinder connection holes, and a cylinder is installed at the bottom end of the hydraulic directional valve 2. The cylinder connection holes are connected to the cylinder.

[0027] Specifically, after the first coil 101 inside the electromagnetic reversing valve 1 is energized, it generates an electromagnetic thrust that pushes the second valve core 103 to the right until component P1 107 communicates with component B1 105 and component A1 106 communicates with component T1 104, as shown. Figure 2 As shown, hydraulic oil enters from component P1 107 through component B1 105 into port b1 109. From port b1 109, the oil flows through port b3 204 into the R chamber 205 of the hydraulic directional valve. Before port b3 204, there is another branch orifice. However, because the first valve core 206 inside the hydraulic directional valve 2 has not yet moved, port b2 203 is still closed, preventing control oil from flowing into the R chamber 205. During initial movement, the small flow of control oil entering from port b3 204 pushes the first valve core 206 to move slowly. The first valve core 206 moves to the left into port b2 203. As the first valve core 206 moves, the opening of port b2 203 gradually widens, and the control oil flow also gradually increases. The moving speed of the first valve core 206 gradually increases. After the first coil 101 inside the solenoid directional valve 1 is de-energized, since port b2 203 is fully open, the first valve core 206 is quickly pushed back to the middle position by the return spring 207. Compared to conventional hydraulic directional control valves, the conventional hydraulic directional control valve 2 can only move the cylinder at a fixed speed. If the oil flow is large, the cylinder moves too fast and too violently; if the oil flow is small, the cylinder moves slowly, but the remaining stroke of the first valve core 206 during the switching process is still slow. After the first coil 101 inside the electromagnetic directional control valve 1 is de-energized, the first valve core 206 is pushed back to the middle position by the return spring 207. However, because the top of the a1 hole 108 and b1 hole 109 is equipped with a damping screw plug, there is resistance when the first valve core 206 resets, and the reset speed of the first valve core 206 is also slowed down, resulting in low production efficiency. This invention can control the oil flow as the first valve core 206 moves, and can gradually increase the oil flow controlling the first valve core 206, so that the cylinder can achieve the effect of slow start and gradual acceleration during movement. The first valve core 206 can also quickly return to the middle position when resetting.

[0028] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An improved buffer-type electro-hydraulic directional valve, comprising a solenoid directional valve (1) and a hydraulically controlled directional valve (2), characterized in that, The electromagnetic reversing valve (1) has a first coil (101) and a second coil (102) respectively installed at its left and right ends. A second valve core (103) is installed on one side of the first coil (101). A component B1 (105) is installed at the bottom of the second valve core (103). A b1 hole (109) is provided at the bottom of the component B1 (105). A component P1 (107) is installed on one side of the component B1 (105). A component A1 (106) is installed on one side of the component P1 (107). The bottom end of component A1 (106) is provided with hole a1 (108), and component T1 (104) is installed on one side of component A1 (106). Damping screw plugs are installed at the top ends of hole a1 (108) and hole b1 (109). The bottom end of hole a1 (108) is connected to hole a2 (201), one end of hole a1 (108) is connected to hole a3 (202), one end of hole b1 (109) is connected to hole b3 (204), and the bottom end of hole b1 (109) is connected to hole b2. (203), a return spring (207) is installed on the bottom side of both the b3 hole (204) and the a3 hole (202). An R cavity (205) is provided on the bottom side of the b3 hole (204). A first valve core (206) is installed on one side of the R cavity (205). When the first valve core (206) inside the hydraulic control directional valve (2) has not yet moved, the b2 hole (203) or the a2 hole (201) is still in a closed state, and the control oil cannot flow into the R cavity (205). During the initial movement, the control oil flows from the b3 hole (204) to the a3 hole (202). The small flow of oil entering from point 04 pushes the first valve core (206) to move slowly. The first valve core (206) moves to the left to the b2 hole (203). Or, during the initial movement, the small flow of oil entering from the a3 hole (202) pushes the first valve core (206) to move slowly. The first valve core (206) moves to the right to the a2 hole (201). The opening of the b2 hole (203) or the a2 hole (201) gradually increases as the first valve core (206) moves. The control oil also gradually increases, and the moving speed of the first valve core (206) gradually increases.

2. The improved buffer-type electro-hydraulic directional valve according to claim 1, characterized in that, The components A1 (106), B1 (105), P1 (107) and T1 (104) are all process holes. The component A1 (106) is connected to hole a1 (108) and is connected to hole a2 (201) and hole a3 (202) through hole a1 (108).

3. The improved buffer-type electro-hydraulic directional valve according to claim 2, characterized in that, The hydraulic control directional valve (2) is symmetrically arranged inside, with its a1 hole (108), a2 hole (201) and a3 hole (202) symmetrical to its b1 hole (109), b2 hole (203) and b3 hole (204).

4. The improved buffer-type electro-hydraulic directional valve according to claim 1, characterized in that, A sliding groove is provided between the first coil (101) and the second coil (102), and the second valve core (103) is disposed inside the sliding groove. The second valve core (103) is slidably connected to the sliding groove.

5. The improved buffer-type electro-hydraulic directional valve according to claim 1, characterized in that, The reset springs (207) are symmetrically arranged, and the reset springs (207) are respectively arranged on the left and right sides of the hydraulic control directional valve (2). One end of the reset spring (207) is equipped with a gasket, and the other end of the gasket is attached to the first valve core (206).

6. The improved buffer-type electro-hydraulic directional valve according to claim 1, characterized in that, The bottom end of the hydraulic control directional valve (2) is provided with five oil cylinder connection holes, and an oil cylinder is installed at the bottom end of the hydraulic control directional valve (2). The oil cylinder connection holes are connected to the oil cylinder.

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