A mechanical reversing valve for controlling the reciprocating motion of a cylinder

Abstract

The present invention provides a mechanical reversing valve for controlling the reciprocating motion of a cylinder, one side of the valve block is a sliding surface, the middle of the sliding surface is provided with a main air inlet hole, a first switching hole and a second switching hole are symmetrically distributed on both sides of the main air inlet hole, the main air inlet hole is correspondingly connected to an external air source, the first switching hole and the second switching hole are respectively connected to the two first air inlets and the second air inlets of the reciprocating cylinder; both ends of the valve core are provided with an air cavity, two valve blocks are respectively arranged at the two ends of the valve core, and are slidingly sealed and assembled with the sliding surface of the valve block, so as to switch between the first switching hole and the second switching hole through reciprocating motion, so that the first switching hole and the second switching hole are respectively connected to the main air inlet hole through the air cavity. The device is a purely mechanical design with a simple structure and strong stability, thereby greatly improving the safety of use in mines; the device can be directly installed on the cylinder end cover with a compact structure and a small space occupancy.

Description

Technical Field

[0001] The invention belongs to the technical field of mining control valves, and in particular relates to a mechanical reversing valve for controlling the reciprocating motion of a cylinder. Background Art

[0002] Cylinders are widely used in engineering, and realizing the reciprocating motion of cylinders is one of the key technologies. Mechanical reversing valves use a fully mechanical mechanism to realize automatic reversing of cylinders, and can be used in some dangerous places. They have great advantages over electromagnetic reversing valves. For example, cylinders used in coal mines must use mechanical reversing mechanisms. The existing reversing valves have a relatively complex structure and are not reliable enough. There is still a risk of failure when used in mines.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art. The present invention provides a mechanical reversing valve for controlling the reciprocating motion of a cylinder.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A mechanical reversing valve for controlling the reciprocating motion of a cylinder, the reversing valve comprising:

[0007] A valve block, one side of which is a sliding surface, a main air inlet hole is provided in the middle of the sliding surface, a first switching hole and a second switching hole are symmetrically distributed on both sides of the main air inlet hole, the main air inlet hole is correspondingly connected to an external air source, and the first switching hole and the second switching hole are respectively connected to two first air inlets and a second air inlet of a reciprocating cylinder;

[0008] A valve core, both ends of which are provided with air cavities, and the two valve blocks are respectively arranged at the two ends of the valve core and are slidingly sealed and assembled with the sliding surfaces of the valve blocks, so as to switch between the first switching hole and the second switching hole through reciprocating motion, so that the first switching hole and the second switching hole are connected to the main air inlet hole through the air cavities respectively.

[0009] Preferably, a first spring pointing to the valve block is provided inside the air cavity, the first spring abuts against the sliding surface via a sealing ring, and the end and periphery of the sealing ring are slidably sealed with the sliding surface and the inner wall of the air cavity respectively.

[0010] Preferably, an O-ring is provided on the outer periphery of the sealing ring corresponding to the air cavity.

[0011] Preferably, the air cavity is a columnar structure, and the inner diameter of the sealing ring is adapted to the circumscribed circle of the main air inlet hole and any switching hole.

[0012] Preferably, the valve core is driven by a reversing cylinder, and reversing holes are respectively provided at both ends of the reversing cylinder. A first piston plate is slidably assembled between the two reversing holes, and a first piston rod is provided on one side of the first piston plate, which extends out of the reversing cylinder and corresponds to the valve core.

[0013] Preferably, convex strips corresponding to the valve core are provided on both sides of the sliding surface to form a sliding groove.

[0014] Preferably, the valve block and the valve core are arranged on the upper end cover of the reciprocating cylinder, and the middle part of the upper end cover is provided with two first air inlets corresponding to each other, and the two first air inlets respectively correspond to the first switching holes of the two valve blocks;

[0015] The second switching hole of the valve block extends to the outer edge of the upper end cover to form a receiving port, and is correspondingly connected to the second air inlet at the other end of the reciprocating cylinder through a connecting pipe.

[0016] Preferably, a connecting ring corresponding to the reciprocating cylinder is provided on the lower surface of the upper end cover, the connecting ring is located between the first air inlet and the receiving port, and is connected to the upper end of the cylinder by threaded connection or clamping;

[0017] The interior of the reciprocating cylinder is provided with a second piston plate which is slidably mounted, and a second piston rod extending out of a lower end cover is provided on the side of the second piston plate away from the reversing valve.

[0018] Preferably, the two push rod valves are respectively located on the upper end cover and the lower end cover of the reciprocating cylinder, the push rod of the push rod valve extends into the reciprocating cylinder and faces the second piston plate, and the two reversing holes of the reversing cylinder are connected to the air source through the two push rod valves respectively.

[0019] Preferably, there are a plurality of the receiving ports, and a connecting passage corresponding to the plurality of the receiving ports is provided inside the upper end cover.

[0020] Beneficial effects: This device is of purely mechanical design, with simple structure and strong stability, thus greatly improving the safety of use in mines; this device can be directly installed on the cylinder end cover, with compact structure and small space occupancy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0022] Figure 1 A simplified structural diagram of a reversing valve in a specific embodiment provided by the present invention;

[0023] Figure 2A bottom view of a reversing valve in a specific embodiment of the present invention;

[0024] Figure 3 for Figure 2 Middle AA section view;

[0025] Figure 4 This is a schematic diagram of the structure of a reciprocating cylinder in a specific embodiment provided by the present invention;

[0026] Figure 5 A schematic structural diagram of a valve block in a specific embodiment provided by the present invention;

[0027] Figure 6 A schematic bottom view of a valve block in a specific embodiment provided by the present invention;

[0028] Figure 7 It is a schematic diagram of the assembly of the valve core in the specific embodiment provided by the present invention.

[0029] In the figure: 1. upper end cover; 2. valve block; 3. reversing cylinder; 4. main air inlet hole; 5. valve core; 6. reversing hole; 7. connecting ring; 8. first air inlet port; 9. connecting port; 10. first switching hole; 11. second switching hole; 12. first spring; 13. connecting channel; 14. lower end cover; 15. second air inlet port; 16. reciprocating cylinder; 17. second piston plate; 18. second piston rod; 19. push rod valve; 20. first piston plate; 21. first piston rod; 22. sealing ring. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0031] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0033] like Figure 1-7 As shown, a mechanical reversing valve for controlling the reciprocating motion of a cylinder is provided. The reversing valve includes a valve block 2 and a valve core 5. The reversing valve is a casting. One side of the valve block 2 is a sliding surface. The sliding surface is a smooth flat surface. A main air inlet hole 4 is provided in the middle of the sliding surface. A first switching hole 10 and a second switching hole 11 are symmetrically distributed on both sides of the main air inlet hole 4. The main air inlet hole 4 extends to the upper surface of the reversing valve for connecting an air source. The main air inlet hole 4 is correspondingly connected to an air pipe and an external air source through a threaded connecting joint. The first switching hole 10 and the second switching hole 11 extend to the lower surface of the valve block 2 and are respectively connected to two first air inlets 8 and a second air inlet 15 of a reciprocating cylinder 16. The first air inlet 8 and the second air inlet 15 of the reciprocating cylinder 16 are respectively supplied with air to realize the reciprocating motion of the piston rod.

[0034] Both ends of the valve core 5 are provided with air cavities, and the space of the air cavity is adapted to the space corresponding to the main air inlet hole 4 and any one of the switching holes, so that the main air inlet hole 4 and any one of the switching holes are connected, so that the external air source enters the air cavity through the main air inlet hole 4, and is guided to the corresponding air inlet port of the reciprocating cylinder 16 through a corresponding switching hole through the connection of the air cavity.

[0035] In the present embodiment, each reversing valve comprises two valve blocks 2 and a valve core 5. The two valve blocks 2 are respectively arranged at the two ends of the valve core 5, so as to ensure the stability of the use of the reversing valve through a double switching channel, and ensure that the reversing valve will not fail when used in the harsh environment of the mine. The two ends of the valve core 5 are slidingly sealed with the sliding surfaces of the valve block 2, so that the air cavity of the valve core 5 is switched between the first switching hole 10 and the second switching hole 11 through relative sliding, so that the first switching hole 10 and the second switching hole 11 are connected to the main air inlet hole 4 through the air cavity respectively, thereby reversing the reciprocating cylinder 16.

[0036] In an optional embodiment, in order to maintain the sealing performance of the air cavity and the sliding surface, a first spring 12 pointing to the valve block 2 is provided inside the air cavity, one end of the first spring 12 is in contact with the air cavity, and the other end is in contact with the sliding surface through a sealing ring 22. The sealing ring 22 is a rubber ring, which is slidably sealed with the sliding surface under the pressure of the first spring 12. The sealing ring 22 and the outer periphery are provided with a sliding seal with the inner wall of the air cavity, thereby ensuring that no leakage is emitted during the gas source supply process.

[0037] In an optional embodiment, in order to improve the sealing performance with the air cavity, an O-shaped sealing ring corresponding to the air cavity is provided on the outer periphery of the sealing ring 22 . The O-shaped sealing ring is a rubber ring, and an annular groove is provided on the outer wall of the sealing ring 22 .

[0038] The air cavity can be cylindrical, square or multi-faceted in structure, preferably a cylindrical structure. Sealing oil is provided between the sealing ring 22, the air cavity and the sliding surface. The inner diameter of the sealing ring 22 is matched with the circumscribed circle of the main air inlet hole 4 and any switching hole, so as to ensure that the main air inlet hole 4 and the corresponding switching hole are independently connected when the valve core 5 moves.

[0039] In an optional embodiment, the valve core 5 is driven by the reversing cylinder 3, so that the valve core 5 switches between the first switching hole 10 and the second switching hole 11. Reversing holes 6 are respectively provided at both ends of the reversing cylinder 3, and a first piston plate 20 is slidably assembled between the two reversing holes 6. The first piston plate 20 can perform piston movement between the two reversing holes 6. One side of the first piston plate 20 is provided with a first piston rod 21 that extends out of the reversing cylinder 3 and corresponds to the valve core 5. When air is supplied to the side of the first piston plate 20 away from the corresponding first piston rod 21, the air pressure drives the first piston plate 20 to move the piston and drives the first piston rod 21 to drive the valve core 5, thereby driving the valve core 5 to move from the first switching hole 10 to the second switching hole 11, and when it moves to the second switching hole 11, it drives the reciprocating cylinder 16 to drive in the opposite direction.

[0040] The two push rod valves 19 are respectively located on the upper end cover 1 and the lower end cover 14 of the reciprocating cylinder 16. The two reversing holes 6 of the reversing cylinder 3 are respectively connected to the two push rod valves 19. The push rod valve 19 is correspondingly connected to the second piston plate 17 of the reciprocating cylinder 16, so that the corresponding push rod valve 19 is triggered by the end of the stroke of the second piston plate 17.

[0041] In an optional embodiment, convex strips corresponding to the valve core 5 are provided on both sides of the sliding surface to form a slide groove, the spacing between the two slide grooves is adapted to the valve core 5, and the outer wall of the valve core 5 is set to a columnar or quadrangular prism structure to ensure a stable sliding relationship.

[0042] Furthermore, a flange corresponding to the convex strip is provided on the edge of the valve core 5, and a sliding groove corresponding to the flange is provided on the convex strip.

[0043] In an optional embodiment, the valve block 2 and the valve core 5 are arranged on the upper end cover 1 of the reciprocating cylinder 16. The upper end cover 1 is a casting. An installation position corresponding to the valve block 2 and the valve core 5 is provided on the upper surface of the upper end cover 1, and the valve block 2 and the valve core 5 are installed and fixed on the upper surface of the upper end cover 1 by bolts. Two first air inlets 8 corresponding to each other are provided in the middle of the upper end cover 1. The first air inlet 8 is a through hole facing the first switching hole 10. The two first air inlets 8 correspond to the first switching holes 10 of the two valve blocks 2 respectively, so that the reciprocating cylinder 16 can be directly supplied with air.

[0044] The second switching hole 11 of the valve block 2 extends to the outer edge of the upper end cover 1 to form a receiving port 9, and is correspondingly connected to the second air inlet 15 at the other end of the reciprocating cylinder 16 through a connecting pipe.

[0045] In this embodiment, the main body of the reciprocating cylinder 16 is columnar, the upper end cover 1 is square, and four connecting ports 9 are provided. The four connecting ports 9 are respectively located at the corners of the upper end cover 1 corresponding to the outer side of the reciprocating cylinder 16. The second air inlet 15 is provided on the lower end cover 14 of the reciprocating cylinder 16, and is connected to the corresponding connecting port 9 through an air pipe and a connecting joint, so that the air source in the second switching hole 11 can be supplied to the second air inlet 15.

[0046] In an optional embodiment, the first switching hole 10 and the second switching hole 11 are arranged on circles of different diameters that are concentrically distributed with the reciprocating cylinder 16 , and specifically, the diameter of the circle where the first switching hole 10 is located is smaller than the diameter of the circle where the second switching hole 11 is located.

[0047] In an optional embodiment, a connecting ring 7 corresponding to the reciprocating cylinder 16 is provided on the lower surface of the upper end cover 1. The connecting ring 7 and the upper end cover 1 are cast integrally. The connecting ring 7 is located between the first air inlet 8 and the connecting port 9, so that the second air inlet 15 can be connected upward to the connecting port 9. The connecting ring 7 can be connected to the upper end of the cylinder by threaded connection or clamping, and a sealing ring can also be set between the two.

[0048] A second piston plate 17 is provided inside the reciprocating cylinder 16 for sliding assembly. A second piston rod 18 extending out of the lower end cover 14 is provided on the second piston plate 17 away from the reversing valve. A middle hole corresponding to the second piston rod 18 is provided on the lower end cover 14, and a sealing ring corresponding to the second piston rod 18 is provided in the middle hole.

[0049] In an optional embodiment, two push rod valves 19 are respectively located on the upper end cover 1 and the lower end cover 14 of the reciprocating cylinder 16. The push rod valve 19 is fixed to the upper end cover 1 and the lower end cover 14 by threaded assembly. The upper end cover 1 and the lower end cover 14 are provided with through holes corresponding to the push rods of the push rod valves 19 so that the push pipe can be extended and retracted into the reciprocating cylinder 16. The push rod of the push rod valve 19 extends into the reciprocating cylinder 16 and faces the second piston plate 17. The two reversing holes 6 of the reversing cylinder 3 are connected to the air source through the two push rod valves 19 respectively.

[0050] There are four receiving ports 9, and connecting channels 13 corresponding to the multiple receiving ports 9 are provided inside the upper end cover 1. The four connecting channels 13 are corresponding to the two second switching holes 11, so as to realize the dual-channel driving reciprocating cylinder 16. The connecting channel 13 can be a ring-shaped or square structure corresponding to the upper end cover 1. In actual use, one or two of the receiving ports 9 are connected to the second air inlet 15, and the remaining receiving ports 9 are closed by plungers.

[0051] In this embodiment, the specific use process of the reversing valve is as follows: in the initial working state of the cylinder, the gas circuit supplies air to the reciprocating cylinder 16 through the first switching hole 10, specifically, the external gas source -> the main air inlet hole 4 of the valve block 2 -> the air cavity -> the first switching hole 10 -> the first air inlet port 8, and then pushes the second piston plate 17 of the reciprocating cylinder 16 downward; the gas under the second piston plate 17 enters the second air inlet port 15 -> the receiving port 9 -> the second switching hole 11 -> discharged.

[0052] When the second piston plate 17 moves downward and contacts the push rod valve 19 on the lower end cover 14 --> the push rod of the push rod valve 19 is compressed --> a passage is formed inside the push rod valve 19 --> the gas enters the reversing hole 6 above the annular cylinder --> drives the first piston plate 20 downward --> drives the valve core 5 to switch to the second switching hole 11; at this time, the air source enters the main air inlet hole 4 of the valve block 2 --> the air cavity --> the second switching hole 11 --> the second air inlet port 15, and then pushes the second piston plate 17 of the reciprocating cylinder 16 upward; the gas above the second piston plate 17 enters the first air inlet port 8 --> the first switching hole 10 --> is discharged.

[0053] The second piston plate 17 is separated from the push rod valve 19 on the lower end cover 14, and a closed circuit is formed inside the push rod valve 19. At this time, the second piston plate 17 moves upward to trigger the push rod valve 19 on the upper end cover 1, and the upper push rod valve 19 forms a passage. The air source enters the reversing hole 6 below the annular cylinder through the upper push rod valve 19. At this time, the valve core 5 is driven to switch upward to the first switching hole 10, so that the reciprocating cylinder 16 forms a reciprocating motion.

[0054] The push rod valve 19 is a conventional valve body, and no further description or excessive restrictions are given here.

[0055] 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, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A mechanical reversing valve for controlling the reciprocating motion of a cylinder, characterized in that: The reversing valve comprises: A valve block, one side of which is a sliding surface, a main air inlet hole is provided in the middle of the sliding surface, a first switching hole and a second switching hole are symmetrically distributed on both sides of the main air inlet hole, the main air inlet hole is correspondingly connected to an external air source, and the first switching hole and the second switching hole are respectively connected to two first air inlets and a second air inlet of a reciprocating cylinder; A valve core, both ends of which are provided with air cavities, and the two valve blocks are respectively arranged at the two ends of the valve core and are slidingly sealed and assembled with the sliding surfaces of the valve blocks, so as to switch between the first switching hole and the second switching hole through reciprocating motion, so that the first switching hole and the second switching hole are connected to the main air inlet hole through the air cavities respectively.

2. The mechanical reversing valve for controlling the reciprocating motion of a cylinder according to claim 1, characterized in that: A first spring pointing to the valve block is arranged inside the air cavity. The first spring abuts against the sliding surface through a sealing ring. The end and the periphery of the sealing ring are respectively slidably sealed with the sliding surface and the inner wall of the air cavity.

3. The mechanical reversing valve for controlling the reciprocating motion of a cylinder according to claim 1, characterized in that: An O-shaped sealing ring corresponding to the air cavity is arranged on the outer periphery of the sealing ring.

4. The mechanical reversing valve for controlling the reciprocating motion of a cylinder according to claim 1, characterized in that: The air cavity is a columnar structure, and the inner diameter of the sealing ring is adapted to the circumscribed circle of the main air inlet hole and any switching hole.

5. The mechanical reversing valve for controlling the reciprocating motion of a cylinder according to claim 1, characterized in that: The valve core is driven by a reversing cylinder, and reversing holes are respectively provided at both ends of the reversing cylinder. A first piston plate is slidably mounted between the two reversing holes, and a first piston rod is provided on one side of the first piston plate, which extends out of the reversing cylinder and corresponds to the valve core.

6. The mechanical reversing valve for controlling the reciprocating motion of a cylinder according to claim 1, characterized in that: The two sides of the sliding surface are provided with convex strips corresponding to the valve core to form a sliding groove.

7. The mechanical reversing valve for controlling the reciprocating motion of a cylinder according to claim 5, characterized in that: The valve block and the valve core are arranged on the upper end cover of the reciprocating cylinder, and the middle part of the upper end cover is provided with two first air inlets corresponding to each other, and the two first air inlets respectively correspond to the first switching holes of the two valve blocks; The second switching hole of the valve block extends to the outer edge of the upper end cover to form a receiving port, and is correspondingly connected to the second air inlet at the other end of the reciprocating cylinder through a connecting pipe.

8. The mechanical reversing valve for controlling the reciprocating motion of a cylinder according to claim 7, characterized in that: The lower surface of the upper end cover is provided with a connecting ring corresponding to the reciprocating cylinder, the connecting ring is located between the first air inlet and the receiving port, and is connected to the upper end of the cylinder by threaded connection or clamping; The interior of the reciprocating cylinder is provided with a second piston plate which is slidably mounted, and a second piston rod extending out of a lower end cover is provided on the side of the second piston plate away from the reversing valve.

9. The mechanical reversing valve for controlling the reciprocating motion of a cylinder according to claim 8, characterized in that: The two push rod valves are respectively located on the upper end cover and the lower end cover of the reciprocating cylinder. The push rod of the push rod valve extends into the reciprocating cylinder and faces the second piston plate. The two reversing holes of the reversing cylinder are respectively connected to the air source through the two push rod valves.

10. The mechanical reversing valve for controlling the reciprocating motion of a cylinder according to claim 7, characterized in that: There are multiple receiving ports, and the upper end cover is internally provided with connecting passages corresponding to and connecting the multiple receiving ports.

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