Pneumatic control device of hydraulic reversing valve

Abstract

The utility model provides a pneumatic control device of a hydraulic reversing valve, which belongs to the technical field of hydraulic reversing valves and comprises a valve body, a multi-runner valve cavity is arranged in the valve body, a valve core is movably connected in the multi-runner valve cavity, a plurality of reversing inlet and outlet connectors are arranged at the bottom of the valve body, the reversing inlet and outlet connectors are communicated with the multi-runner valve cavity in a sealing manner, and a hydraulic cylinder is arranged at the top of the valve body. A connecting piston rod is movably connected into the hydraulic cylinder, a movable piston is arranged in the middle of the connecting piston rod, a second air inlet and outlet end is arranged on one side of the top of the hydraulic cylinder, and a first air inlet and outlet end is arranged on the other side of the top of the hydraulic cylinder. According to the pneumatic control device of the hydraulic reversing valve, the movable piston is driven to move in the multi-flow-channel valve cavity through piston power generated by air suction and air suction in two directions, liquid steering is completed, air pressure in the two directions is mutually balanced, stress of a pushing end is reduced, and stability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic reversing valves, and in particular relates to a pneumatic control device of a hydraulic reversing valve. Background Art

[0002] The existing hydraulic reversing valve moves the valve stem through hydraulic pressure during use, blocks different valve ports, and realizes the direction of liquid flow. It is necessary to control the hydraulic components through multiple oil pipes. It is very troublesome to switch the oil pipes back and forth to deliver oil during use. Among them, the "a kind of air-controlled hydraulic reversing valve device" disclosed by the application number "CN202321913217.2" is also an increasingly mature technology. The valve core can leave the initial position by moving the valve core push rod, for example, both move to the left, and then the P port is connected with the A port; when the air pipe joint stops blowing air into the cylinder body, the cylinder piston returns to the initial position under the action of the return spring. Because the valve core push rod is connected to the cylinder piston, the valve core push rod also returns to the initial position, and the valve core returns to the starting position, and the A port is blocked again. However, the device also has the following defects: during use, the thrust of the air pressure is a unidirectional thrust, and the thrust end bears a large force. When the direction of the liquid or gas in the valve port is switched, the air flow direction is single, and the force direction is consistent, resulting in a large pressure on the air pressure force end during the pushing process, and it is not convenient to control the pressure value of the air pressure. Utility Model Content

[0003] The utility model aims to provide a pneumatic control device for a hydraulic reversing valve, aiming to solve the problem in the prior art that the thrust of the air pressure during use is a unidirectional thrust, the thrust end bears a large force, the air flow direction is single when switching the direction of the liquid or gas at the valve port, and the force direction is consistent, resulting in a large pressure on the air pressure force end during the pushing process, and it is not convenient to control the pressure value of the air pressure.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: comprising a valve body, a multi-channel valve cavity is provided in the valve body, a valve core is movably connected in the multi-channel valve cavity, a plurality of reversing inlet and outlet joints are provided at the bottom of the valve body, the reversing inlet and outlet joints are sealed and connected with the multi-channel valve cavity, a hydraulic cylinder is provided on the top of the valve body, a connecting piston rod is movably connected in the hydraulic cylinder, a movable piston is provided in the middle of the connecting piston rod, a second inlet and outlet end is provided on one side of the top of the hydraulic cylinder, a first inlet and outlet end is provided on the other side of the top of the hydraulic cylinder, the connecting piston rod is provided with a bow-shaped connecting rod, and both ends of the bow-shaped connecting rod are fixedly connected to both ends of the valve core.

[0005] In an implementation scheme of a pneumatic control device of a hydraulic reversing valve of the utility model, sealing plugs are symmetrically provided in the middle of the valve core, movable cavities are provided on both sides of the multi-channel valve cavity, sealing plugs are provided on both sides of the valve core, and the sealing plugs are movably connected in the movable cavity.

[0006] In this solution, by adjusting the position of the valve core in the multi-channel valve chamber, the sealing plug blocks the corresponding holes and adjusts the output direction of the liquid in the reversing inlet and outlet joint. At this time, when the sealing plug moves, it isolates the liquid between the active chamber and the multi-channel valve chamber to prevent liquid from leaking into the active chamber and causing liquid leakage.

[0007] In an implementation scheme of a pneumatic control device for a hydraulic reversing valve of the utility model, a buffer spring is provided on one side of the sealing plug.

[0008] In this solution, during the movement of the sealing plug, a buffer spring is used to reduce the impact of the valve core during the left and right movement, thereby improving the stability of the equipment.

[0009] In an implementation scheme of a pneumatic control device for a hydraulic reversing valve of the utility model, the first air inlet and outlet ends and the second air inlet and outlet ends are provided with air pressure detectors, and the air inlet and outlet ends of the air pressure detectors are provided with air pressure regulating valves.

[0010] In this solution, the air pressure transported inside the first air inlet and outlet end heads and the second air inlet and outlet end heads is detected by an air pressure detector, and the air pressure transported inside the first air inlet and outlet end heads and the second air inlet and outlet end heads is adjusted by an air pressure regulating valve.

[0011] In an implementation scheme of a pneumatic control device for a hydraulic reversing valve of the utility model, a flow limiting valve is arranged at the end of the reversing inlet and outlet joint.

[0012] In this solution, the flow rate of the inlet and outlet liquid is adjusted by a flow limiting valve at the end of the reversing inlet and outlet joint.

[0013] In an implementation scheme of a pneumatic control device for a hydraulic reversing valve of the utility model, gas sealing rings are arranged on both sides of the inner wall of the hydraulic cylinder.

[0014] In this solution, gas sealing rings on both sides of the inner wall of the hydraulic cylinder are used to prevent gas leakage caused by the first inlet and outlet ends and the second inlet and outlet ends during the process of pumping and inhaling gas.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1) By connecting the first air inlet and outlet end head and the second air inlet and outlet end head to the external air pumping and charging equipment, the first air inlet and outlet end head and the second air inlet and outlet end head cooperate with each other to move the movable piston in the hydraulic cylinder, and the connecting piston rod moves left and right to drive the bow-shaped connecting rod to move the valve core in the multi-channel valve cavity. By adjusting the position of the valve core in the multi-channel valve cavity, the sealing plug blocks the corresponding hole, and the output flow direction of the liquid in the reversing inlet and outlet joint is adjusted. The piston power generated by air pumping and suction in two directions drives the movable piston to move in the multi-channel valve cavity to complete the liquid diversion. The air pressure in the two directions is balanced with each other, reducing the force on the push end and improving stability;

[0017] 2) The air pressure inside the first air inlet and outlet end and the second air inlet and outlet end is adjusted by the air pressure regulating valve to keep the air pressure of the delivery and extraction balanced, thereby maintaining the stability of the equipment during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the valve body of the utility model;

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of the hydraulic cylinder of the utility model.

[0022] In the figure: 1. valve body; 2. multi-channel valve chamber; 3. valve core; 4. reversing inlet and outlet joint; 5. hydraulic cylinder; 6. connecting piston rod; 7. movable piston; 8. second inlet and outlet ends; 9. first inlet and outlet ends; 10. bow-shaped connecting rod; 11. sealing plug; 12. movable chamber; 13. sealing plug; 14. buffer spring; 15. air pressure detector; 16. air pressure regulating valve; 17. flow limiting valve; 18. gas sealing ring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-3 The utility model provides the following technical solutions: a pneumatic control device of a hydraulic reversing valve, comprising a valve body 1, a multi-channel valve cavity 2 is provided in the valve body 1, a valve core 3 is movably connected in the multi-channel valve cavity 2, a plurality of reversing inlet and outlet joints 4 are provided at the bottom of the valve body 1, the reversing inlet and outlet joints 4 are sealed and connected with the multi-channel valve cavity 2, a hydraulic cylinder 5 is provided at the top of the valve body 1, a connecting piston rod 6 is movably connected in the hydraulic cylinder 5, a movable piston 7 is provided in the middle of the connecting piston rod 6, a second inlet and outlet end 8 is provided on one side of the top of the hydraulic cylinder 5, a first inlet and outlet end 9 is provided on the other side of the top of the hydraulic cylinder 5, a bow-shaped connecting rod 10 is provided on the connecting piston rod 6, and both ends of the bow-shaped connecting rod 10 are fixedly connected to both ends of the valve core 3.

[0025] For a specific embodiment of a pneumatic control device for a hydraulic reversing valve, please refer to Figure 2 : A sealing plug 11 is symmetrically provided in the middle of the valve core 3, and an active cavity 12 is provided on both sides of the multi-channel valve cavity 2. A sealing plug 13 is provided on both sides of the valve core 3, and the sealing plug 13 is movably connected to the active cavity 12.

[0026] See also Figure 2 : During the movement of the valve core 3 in the multi-channel valve chamber 2, the position of the valve core 3 in the multi-channel valve chamber 2 is adjusted so that the sealing plug 13 blocks the corresponding holes and adjusts the output direction of the liquid in the reversing inlet and outlet joint 4. At this time, the sealing plug 13 isolates the liquid between the active chamber 12 and the multi-channel valve chamber 2 when it moves, thereby preventing the liquid from leaking into the active chamber 12 and causing liquid leakage.

[0027] For a specific embodiment of a pneumatic control device for a hydraulic reversing valve, please refer to Figure 2 : A buffer spring 14 is provided on one side of the sealing plug 13.

[0028] See also Figure 2 : During the movement of the sealing plug 13, the buffer spring 14 reduces the impact of the valve core 3 during the left and right movement, thereby improving the stability of the equipment.

[0029] For a specific embodiment of a pneumatic control device for a hydraulic reversing valve, please refer to Figure 1 : The first air inlet and outlet end 9 and the second air inlet and outlet end 8 are provided with an air pressure detector 15, and the air pressure detector 15 is provided with an air pressure regulating valve 16 at the air inlet and outlet ends.

[0030] See also Figure 1 : The air pressure transported inside the first air inlet and outlet terminal 9 and the second air inlet and outlet terminal 8 is detected by the air pressure detector 15, and the air pressure transported inside the first air inlet and outlet terminal 9 and the second air inlet and outlet terminal 8 is adjusted by the air pressure regulating valve 16.

[0031] For a specific embodiment of a pneumatic control device for a hydraulic reversing valve, please refer to Figure 1 : A flow limiting valve 17 is provided at the end of the reversing inlet and outlet joint 4.

[0032] See also Figure 1 : The flow rate of the liquid in and out is adjusted by the flow limiting valve 17 at the end of the reversing inlet and outlet joint 4.

[0033] For a specific embodiment of a pneumatic control device for a hydraulic reversing valve, please refer to Figure 3 : Gas sealing rings 18 are provided on both sides of the inner wall of the hydraulic cylinder 5.

[0034] See also Figure 3 : The gas sealing rings 18 on both sides of the inner wall of the hydraulic cylinder 5 prevent gas leakage caused by the first inlet and outlet ends 9 and the second inlet and outlet ends 8 during the exhaust and suction processes.

[0035] The utility model provides a pneumatic control device for a hydraulic reversing valve, and a specific method of use is as follows: a first air inlet and outlet end 9 and a second air inlet and outlet end 8 are connected to an external air pumping and charging device, the first air inlet and outlet end 9 and the second air inlet and outlet end 8 cooperate with each other to make the movable piston 7 move in the hydraulic cylinder 5, and the connecting piston rod 6 moves left and right to drive the bow-shaped connecting rod 10 to make the valve core 3 move in the multi-channel valve chamber 2, and by adjusting the position of the valve core 3 in the multi-channel valve chamber 2, the sealing plug 13 blocks the corresponding hole, and the output flow direction of the liquid in the reversing inlet and outlet joint 4 is adjusted, and the piston power generated by air pumping and suction in two directions drives the movable piston 7 to move in the multi-channel valve chamber 2 to complete the liquid diversion, and the air pressure in the two directions is balanced with each other, reducing the force on the push end and improving the stability. When the sealing plug 13 moves, it isolates the liquid between the active chamber 12 and the multi-channel valve chamber 2 to prevent the liquid from leaking into the active chamber 12, causing the liquid to leak.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A pneumatic control device for a hydraulic reversing valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with a multi-channel valve chamber (2), and a valve core (3) is movably connected to the multi-channel valve chamber (2). A plurality of reversing inlet and outlet joints (4) are provided at the bottom of the valve body (1), and the reversing inlet and outlet joints (4) are sealed and connected to the multi-channel valve chamber (2). A hydraulic cylinder (5) is provided at the top of the valve body (1), and a connecting piston rod (6) is movably connected to the hydraulic cylinder (5). A movable piston (7) is provided in the middle of the connecting piston rod (6). A second inlet and outlet air end (8) is provided on one side of the top of the hydraulic cylinder (5), and a first inlet and outlet air end (9) is provided on the other side of the top of the hydraulic cylinder (5). The connecting piston rod (6) is provided with a bow-shaped connecting rod (10), and the two ends of the bow-shaped connecting rod (10) are fixedly connected to the two ends of the valve core (3).

2. A pneumatic control device for a hydraulic reversing valve according to claim 1, characterized in that: A sealing plug (11) is symmetrically arranged in the middle of the valve core (3), movable chambers (12) are arranged on both sides of the multi-channel valve chamber (2), and sealing plugs (13) are arranged on both sides of the valve core (3), and the sealing plugs (13) are movably connected to the movable chamber (12).

3. A pneumatic control device for a hydraulic reversing valve according to claim 2, characterized in that: A buffer spring (14) is provided on one side of the sealing plug (13).

4. A pneumatic control device for a hydraulic reversing valve according to claim 1, characterized in that: The first air inlet and outlet end (9) and the second air inlet and outlet end (8) are provided with an air pressure detector (15), and the air inlet and outlet ends of the air pressure detector (15) are provided with an air pressure regulating valve (16).

5. The pneumatic control device of a hydraulic reversing valve according to claim 1, characterized in that: A flow limiting valve (17) is provided at the end of the reversing inlet and outlet joint (4).

6. The pneumatic control device of a hydraulic reversing valve according to claim 1, characterized in that: Gas sealing rings (18) are provided on both sides of the inner wall of the hydraulic cylinder (5).

Images