Pneumatic opening and closing valve capable of elastically resetting

Abstract

The invention belongs to the technical field of pneumatic valves, and particularly relates to a pneumatic opening and closing valve capable of elastically resetting, which comprises an air cylinder body, an air cylinder cover, an air cylinder piston, a compression spring, an air inlet joint, an air cylinder push rod, a bracket, a valve rod, a valve core, a valve body and an inlet / outlet, the air cylinder cover is connected to an opening in the upper portion of the air cylinder body, the air cylinder piston is connected into the air cylinder body in a sliding mode, the upper end and the lower end of the compression spring are supported between the air cylinder cover and the air cylinder piston respectively, and the air inlet connector is connected to the lower portion of the side wall of the air cylinder body. According to the scheme, the cylinder piston can be driven to move and reset only through one path of high-pressure gas, so that the driving operation of the valve element is relatively simple and energy-saving, during actual control, only the high-pressure gas needs to be output to overcome the elastic force of a compression spring, the gravity of parts, friction force generated by contact and the like, the control mode is simple, and the operation is convenient. Therefore, the stroke control of the valve core is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic valves, in particular to a pneumatic opening and closing valve capable of elastic reset. Background Art

[0002] Pneumatic valves (pneumatic opening and closing valves) use compressed air to propel an actuator, which in turn uses gas-driven piston movement. This compressed air drives multiple pneumatic pistons within the actuator, transmitting force to the crossbeam and internal curved track, which in turn drives the hollow spindle to rotate. Compressed air is delivered to the cylinder, changing the inlet and outlet positions to change the spindle's rotational direction (or by lifting the valve core).

[0003] At present, the cylinder of a pneumatic valve usually has two air inlets and outlets, which are located on both sides of the piston in the cylinder. The piston in the cylinder is moved in different directions based on the switching of the air supply of the two air inlets and outlets. This requires two-way high-pressure gas control, which increases the control cost. In addition, for the movement control of the valve core, the two-way high-pressure gas output is prone to instability of the cylinder piston. Summary of the Invention

[0004] The object of the present invention is to provide a pneumatic opening and closing valve capable of elastic reset, so as to solve the problems of increased use cost and stable valve core control proposed in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a pneumatic opening and closing valve capable of elastic reset, comprising:

[0006] Cylinder block, cylinder head, cylinder piston, compression spring, air inlet joint, cylinder push rod, bracket, valve stem, valve core, valve body and inlet and outlet;

[0007] The cylinder body is hollow and has an upper opening, the cylinder head is connected to the upper opening of the cylinder body, the cylinder piston is slidably connected in the cylinder body, and the upper and lower ends of the compression spring are respectively supported between the cylinder head and the cylinder piston, the air intake joint is connected to the lower part of the side wall of the cylinder body, a support ring is provided on the lower side of the cylinder piston, and the air intake joint is located in the gap between the bottom of the cylinder body and the lower surface of the cylinder piston;

[0008] The valve body is connected to the lower side of the cylinder body through a bracket, a valve core is provided in the valve cavity of the valve body, and inlets and outlets corresponding to the valve cavity are opened on both sides of the valve body. The upper part of the valve core is connected to the valve stem, and the valve stem passes through the valve body and extends to the upper side of the valve body. The upper part of the valve stem is connected to the cylinder push rod, and the cylinder push rod is connected to the bottom end of the cylinder piston.

[0009] Preferably, an open elastic circlip is embedded in the upper opening of the cylinder body, and the open elastic circlip is pressed on the upper side of the cylinder head.

[0010] Preferably, a piston ring is sleeved on the outer wall of the cylinder piston, and the outer wall of the piston ring fits with the inner wall of the cylinder body.

[0011] Preferably, the upper surface of the cylinder piston is connected to a manual rod, which passes through the cylinder head and extends to the upper side of the cylinder head. The top of the manual rod is connected to a handwheel through a cap nut. A sealing ring is embedded in the connection between the upper part of the cylinder head and the manual rod, and the sealing ring is sleeved on the outer wall of the manual rod.

[0012] Preferably, a piston buffer pad is provided on the upper surface of the cylinder piston.

[0013] Preferably, the left and right sides of the bracket are connected with a mounting plate and an indicator plate by screws, and the mounting plate and the indicator plate extend toward the inner side of the bracket to form a clamping channel. The mounting plate is fixedly connected to the travel switch by screws, and a cross plate is fixedly connected to the middle and lower part of the outer wall of the cylinder push rod. The four ends of the cross plate form four side plates, and the operating rods of the travel switches on both sides are placed on the two side plates of the cross plate, and the other two side plates of the cross plate are slidably inserted into the clamping channels on both sides.

[0014] Preferably, an external threaded sleeve is provided on the lower side of the outer wall of the cylinder push rod, and a limiting nut is threadedly connected to the outer wall of the external threaded sleeve, and the limiting nut is located on the upper side of the bottom end of the bracket.

[0015] Preferably, an inner threaded sleeve is fixedly connected to the lower surface of the bracket, and an outer threaded joint matching the inner threaded sleeve is provided on the upper side of the outer wall of the valve body, and the inner threaded sleeve and the outer threaded joint are threadedly connected.

[0016] Preferably, a second sealing ring is embedded in the connection between the inner thread sleeve and the outer thread joint, and the second sealing ring is sleeved on the outer wall of the valve stem. A third sealing ring is embedded in the connection between the bottom of the cylinder body and the cylinder push rod, and the third sealing ring is sleeved on the outer wall of the cylinder push rod.

[0017] Preferably, the indicator plate is provided with a movable groove, and a sliding column is connected to the corresponding side plate of the cross plate, the sliding column is slidably connected in the movable groove and extends to the outside of the movable groove, the upper and middle parts of the sliding column are arc-shaped, and the lower surface of the sliding column is straight, and a movable groove is longitudinally provided on the sliding column, and friction damping blocks are provided on both sides of the interior of the movable groove, and a vertical plate is movably inserted into the interior of the movable groove, and the vertical plate is in contact with the surface of the friction damping block, the upper surface of the vertical plate is provided with an anti-falling baffle, and the bottom end of the vertical plate is provided with a pointed cone separation block, and the outer wall of the indicator plate Two T-shaped slots are provided on the upper side, and the two T-shaped slots are symmetrically arranged on both sides of the movable through slot. The two T-shaped slots are slidably connected to a support plate, and the lower parts of the two support plates close to each other are set to inclined surfaces. The upper side of the outer wall of the indicator plate is connected to a telescopic rod, and the lower side of the telescopic end of the telescopic rod is connected to a guide frame, and the two sides of the bottom end of the guide frame are connected to inclined guide rods, and the inclined guide rods on both sides are respectively located at the lower parts of the two support plates, and the lower corner of the support plate close to the inclined guide rod is rotatably connected to a roller through a rotating shaft, and a lower top plate is provided at the bottom end of the outer wall of the movable through slot.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In this solution, a high-pressure gas path is set, that is, high-pressure gas is input to the lower side of the cylinder body based on the air inlet interface, and the cylinder piston is pushed to move based on the high-pressure gas, and the compression spring is further compressed. When the cylinder piston moves upward, the cylinder piston drives the valve core to move upward through the cylinder push rod and the valve stem, so that the valve core moves upward from the valve cavity, thereby connecting the two inlets and outlets to realize the valve opening operation.

[0020] When the valve needs to be closed, the supply of high-pressure gas to the air inlet interface is stopped, and the high-pressure gas on the lower side of the cylinder body is reversed through the air inlet interface. Under the elastic force of the compression spring, the cylinder piston descends, and the cylinder piston drives the cylinder push rod, valve stem, and valve core to descend, thereby closing the valve cavity of the valve again and disconnecting the two inlets and outlets.

[0021] Based on the above control method, only one high-pressure gas is needed to drive the cylinder piston to move and reset. This makes the driving operation of the valve core relatively simple and energy-saving. In actual control, only high-pressure gas needs to be output to overcome the elastic force of the compression spring and the gravity of the components, the friction generated by contact, etc. The control method is simple, making the stroke control of the valve core more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a partial cross-sectional structural schematic diagram of the present invention;

[0023] Figure 2 For the present invention Figure 1The right side structural diagram of FIG.

[0024] Figure 3 For the present invention Figure 1 The left side structural diagram of FIG.

[0025] Figure 4 This is a schematic diagram of the structure of the present invention after removing the cylinder block;

[0026] Figure 5 This is a structural diagram of the manual rod, cylinder piston, cylinder push rod, and valve stem of the present invention;

[0027] Figure 6 This is a structural diagram of the bracket, cross plate, and indicator plate of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the indicator plate, movable slot, sliding column, etc. of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the sliding column, movable groove and vertical plate of the present invention.

[0030] In the figure: 1. Cylinder body; 2. Cylinder head; 3. Manual lever; 4. Handwheel; 5. Cap nut; 6. Open elastic circlip; 7. Cylinder piston; 8. Piston ring; 9. Piston buffer; 10. Compression spring; 11. Inlet joint; 12. Cylinder push rod; 13. Cross plate; 14. Bracket; 15. Internal threaded sleeve; 16. Valve body; 17. Inlet and outlet; 18. Valve stem; 19. External threaded sleeve; 20. Limit nut; 21. Valve core; 22. Indicator plate; 23. Mounting plate; 24. Travel switch; 25. Moving groove; 26. Sliding column; 27. Moving groove; 28. Friction damping block; 29. Vertical plate; 30. Conical separation block; 31. Anti-falling baffle; 32. Lower top plate; 33. T-slot; 34. Support plate; 35. Guide frame; 36. Tilt guide rod; 37. Telescopic rod. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0033] Example 1:

[0034] See also Figure 1-8 The present invention provides a technical solution: a pneumatic opening and closing valve capable of elastic reset, comprising: a cylinder body 1, a cylinder head 2, a cylinder piston 7, a compression spring 10, an air inlet connector 11, a cylinder push rod 12, a bracket 14, a valve stem 18, a valve core 21, a valve body 16, and an inlet and outlet 17;

[0035] Among them, the cylinder body 1 is hollow and has an upper opening. The cylinder head 2 is connected to the upper opening of the cylinder body 1. The cylinder piston 7 is slidably connected in the cylinder body 1, and the upper and lower ends of the compression spring 10 are respectively supported between the cylinder head 2 and the cylinder piston 7. The air intake joint 11 is connected to the lower part of the side wall of the cylinder body 1. A support ring is provided on the lower side of the cylinder piston 7. The air intake joint 11 is located at the bottom of the cylinder body 1 and is connected to the cylinder piston 7. The valve body 16 is connected to the lower side of the cylinder body 1 through the bracket 14, and a valve core 21 is provided in the valve cavity of the valve body 16. Inlet and outlet 17 corresponding to the valve cavity are provided on both sides of the valve body 16. The upper part of the valve core 21 is connected to the valve stem 18, and the valve stem 18 passes through the valve body 16 and extends to the upper side of the valve body 16. The upper part of the valve stem 18 is connected to the cylinder push rod 12, and the cylinder push rod 12 is connected to the bottom end of the cylinder piston 7.

[0036] Analysis of the above content: Cylinder body 1, cylinder head 2, cylinder piston 7, compression spring 10, air inlet joint 11, cylinder push rod 12, bracket 14, valve stem 18, valve core 21, valve body 16 and inlet and outlet 17 and other components, according to Figure 1 Combination of ways (in addition to the above components, Figure 1 There are other components in the air intake connector 11, the air supply system is connected to the air intake connector 11 (based on the existing air pump, air pipe and other components, which are not described here), and the outlet of the air intake connector 11 is set on the support ring (such as Figure 4 、 5As shown, the circular ring structure at the lower part of the cylinder piston 7 is the support ring) corresponding position. Due to the setting of the support ring, the high-pressure air input by the air inlet joint 11 can enter the lower side of the cylinder piston 7, thereby pushing the cylinder piston 7 up. In this scheme, the top of the cylinder head 2 is closed, or the opening at the top of the cylinder head 2 is closed by a sealing structure to prevent dust from entering, and the edge of the cylinder piston 7 is in sealed contact with the inner wall of the cylinder body 1.

[0037] When high-pressure air is input into the air inlet connector 11, the high-pressure air pushes the cylinder piston 7 to rise, and the cylinder piston 7 squeezes the upper compression spring 10, so that the compression spring 10 is further compressed. At the same time, the cylinder piston 7 lifts the valve core 21 based on the cylinder push rod 12 and the valve stem 18, and the valve core 21 rises from the lower side of the valve cavity. At this time, the two inlets and outlets 17 can be connected; on the contrary, when the air inlet connector 11 stops inputting high-pressure air, the cylinder piston 7 is pushed down by the elastic force of the compression spring 10, and the cylinder piston 7 pushes the valve core 21 down based on the cylinder push rod 12 and the valve stem 18. The valve core 21 descends in the valve cavity, and the two inlets and outlets 17 are again separated.

[0038] Example 2:

[0039] See also Figure 1-8 The present invention provides a technical solution based on the first embodiment: an open elastic circlip 6 is embedded in the upper opening of the cylinder body 1, and the open elastic circlip 6 is pressed on the upper side of the cylinder head 2.

[0040] Analysis of the above content: An embedding groove is opened at the upper opening of the cylinder body 1, and the embedding groove is set to be located just on the upper side of the cylinder head 2, so that the open elastic circlip 6 is contracted and embedded in the embedding groove, and then the open elastic circlip 6 is stretched without being separated from the embedding groove. Based on the blocking of the cylinder head 2 by the open elastic circlip 6, the cylinder head 2 will not be separated from the cylinder body 1.

[0041] Example 3:

[0042] See also Figure 1-8 The present invention provides a technical solution based on the first embodiment: a piston ring 8 is sleeved on the outer wall of the cylinder piston 7, and the outer wall of the piston ring 8 is in contact with the inner wall of the cylinder body 1.

[0043] Analysis of the above content: The piston ring 8 is installed on the outer wall of the cylinder piston 7, and its outer wall is tightly fitted with the inner wall of the cylinder body 1, which can effectively prevent the compressed air in the cylinder from leaking from the gap between the cylinder piston 7 and the cylinder wall of the cylinder body 1, ensuring the stability of the air pressure in the cylinder, so that the valve can open and close normally.

[0044] Example 4:

[0045] See also Figure 1-8 The present invention provides a technical solution based on Example 1: the upper surface of the cylinder piston 7 is connected to a manual rod 3, the manual rod 3 passes through the cylinder head 2 and extends to the upper side of the cylinder head 2, the top end of the manual rod 3 is connected to a handwheel 4 through a cap nut 5, and a sealing ring 1 is embedded in the connection between the upper part of the cylinder head 2 and the manual rod 3, and the sealing ring is sleeved on the outer wall of the manual rod 3.

[0046] Analysis of the above content: When the air inlet connector 11 or the external air supply system is damaged, it is based on manual control. The manual control method is: hold the handwheel 4 to lift the manual rod 3, and lift the cylinder piston 7 based on the manual rod 3, so that the valve core 21 is lifted to open the valve.

[0047] Embodiment 5:

[0048] See also Figure 1-8 The present invention provides a technical solution based on the first embodiment: a piston buffer pad 9 is provided on the upper surface of the cylinder piston 7.

[0049] Analysis of the above content: The piston buffer pad 9 blocks the upper side of the cylinder piston 7 and plays a buffering role on the cylinder piston 7. Specifically, when the cylinder piston 7 rises, if the cylinder piston 7 continues to rise and there is a tendency of impact and collision between the cylinder piston 7 and the cylinder body 1, the piston buffer pad 9 is in the middle and plays a buffering role.

[0050] Example 6:

[0051] See also Figure 1-8 , the present invention provides a technical solution based on embodiment four: the left and right sides of the bracket 14 are connected with a mounting plate 23 and an indicator plate 22 by screws, the mounting plate 23 and the indicator plate 22 extend to the inner side of the bracket 14 to form a clamping channel, the mounting plate 23 is fixedly connected to the travel switch 24 by screws, the middle and lower part of the outer wall of the cylinder push rod 12 is fixedly connected with a cross plate 13, the four ends of the cross plate 13 form four side plates, the operating rods of the travel switches 24 on both sides are placed on the two side plates of the cross plate 13, and the other two side plates of the cross plate 13 are slidably inserted into the clamping channels on both sides.

[0052] Analysis of the above content: On the basis of Example 4, when the cylinder piston 7 is pneumatically pushed to rise, if high-pressure gas is continuously output, the cylinder piston 7 will have a tendency to continue to rise, which will cause the air pressure in the cylinder body 1 to be too high, and there is a risk of damage to the internal components or the air pipe of the external air supply system. Here, based on the control of the air pump operation of the external air supply system by the travel switch 24, when the cylinder push rod 12 drives the cross plate 13 to rise, the cross plate 13 pushes the operating rod of the travel switch 24 upward until it reaches the action position of the travel switch 24. At this time, the travel switch 24 cuts off the power supply to the air pump of the external air supply system, causing the air pump to stop supplying air. At this time, the air pressure inside the cylinder body 1 is stable, so that the cylinder piston 7 is suspended. In this way, the cylinder push rod 12, the valve stem 18, and the valve core 21 are driven to keep the valve open. When the valve needs to be closed, the high-pressure gas in the cylinder body 1 can be discharged through the external air supply system (a branch pipe can also be set on the air pipe of the external air supply system, and a solenoid valve can be set on the branch pipe. When the high-pressure gas needs to be released, the solenoid valve can be opened).

[0053] Embodiment seven:

[0054] See also Figure 1-8 The present invention provides a technical solution based on Example 1: an external threaded sleeve 19 is provided on the lower side of the outer wall of the cylinder push rod 12, and a limiting nut 20 is threadedly connected to the outer wall of the external threaded sleeve 19, and the limiting nut 20 is located on the upper side of the bottom end of the bracket 14.

[0055] Analysis of the above content: The limit nut 20 can be adjusted on the external threaded sleeve 19, so that the limit nut 20 moves up and down on the external threaded sleeve 19. When the lower side of the limit nut 20 is set to just contact the upper side of the bottom end of the bracket 14, the valve core 21 just reaches the bottom of the valve cavity, thereby realizing the closure of the valve.

[0056] Embodiment 8:

[0057] See also Figure 1-8 Based on the first embodiment, the present invention provides a technical solution: an internal threaded sleeve 15 is fixedly connected to the lower surface of the bracket 14, and an external threaded joint that cooperates with the internal threaded sleeve 15 is provided on the upper side of the outer wall of the valve body 16. The internal threaded sleeve 15 and the external threaded joint are threadedly connected. A second sealing ring is embedded in the connection between the internal threaded sleeve 15 and the external threaded joint, and the second sealing ring is sleeved on the outer wall of the valve stem 18. A third sealing ring is embedded in the connection between the bottom of the cylinder body 1 and the cylinder push rod 12, and the third sealing ring is sleeved on the outer wall of the cylinder push rod 12.

[0058] Analysis of the above content: The threaded connection method is used for easy installation and disassembly. Based on the setting of the second and third sealing rings, the sealing effect of the above connection is achieved without affecting the movement of the valve stem 18 and the cylinder push rod 12.

[0059] Embodiment 9:

[0060] See also Figure 1-8 The present invention provides a technical solution based on embodiment 6: a movable groove 25 is provided on the indicator plate 22, and a sliding column 26 is connected to the corresponding side plate of the cross plate 13. The sliding column 26 is slidably connected in the movable groove 25 and extends to the outside of the movable groove 25. The upper and middle parts of the sliding column 26 are arc-shaped, and the lower surface of the sliding column 26 is straight. A movable groove 27 is longitudinally provided on the sliding column 26, and friction damping blocks 28 are provided on both sides of the interior of the movable groove 27. A vertical plate 29 is movably inserted into the interior of the movable groove 27, and the vertical plate 29 is in surface contact with the friction damping block 28. The upper surface of the vertical plate 29 is provided with an anti-falling baffle 31, and the bottom end of the vertical plate 29 is provided with a pointed cone separation block 30 Two T-shaped slots 33 are provided on the upper side of the outer wall of the indicator plate 22, and the two T-shaped slots 33 are symmetrically arranged on both sides of the movable through slot 25. A support plate 34 is slidably connected to the two T-shaped slots 33, and the lower parts of the two support plates 34 close to each other are set to inclined surfaces. A telescopic rod 37 is connected to the upper side of the outer wall of the indicator plate 22, and a guide frame 35 is connected to the lower side of the telescopic end of the telescopic rod 37. The bottom ends of the guide frames 35 are connected to inclined guide rods 36 on both sides, and the inclined guide rods 36 on both sides are respectively located at the lower parts of the two support plates 34, and the lower corners of the support plates 34 close to the inclined guide rods 36 are rotatably connected to rollers through a rotating shaft. The bottom end of the outer wall of the movable through slot 25 is provided with a lower top plate 32.

[0061] Analysis of the above content: This embodiment is set on the basis of the fourth and sixth embodiments. The background of this embodiment is that when the air intake connector 11 or the external air supply system fails and the cylinder piston 7 cannot rise, it is necessary to manually lift the cylinder piston 7, the cylinder push rod 12, the valve stem 18, and the valve core 21. At this time, the travel switch 24 has no effect (because its detection function is to detect whether it is in place, and the damaged air intake connector 11 or the external air supply system can no longer control the air pressure stability). At this time, in order to keep the valve in a normally open state, the following operations are performed:

[0062] The hand wheel 4 lifts the manual rod 3, and the manual rod 3 lifts the cylinder piston 7, so that the cylinder push rod 12, the valve stem 18, and the valve core 21 are lifted to open the valve. At the same time, the cylinder push rod 12 drives the cross plate 13 to rise, and the sliding column 26 on the cross plate 13 rises accordingly. In the initial state, the two support plates 34 are separated. The sliding column 26 passes through between the two support plates 34 and rises until the anti-falling baffle 31 contacts the top of the guide frame 35. At this time, the anti-falling baffle 31 pushes the guide frame 35 to rise, the telescopic rod 37 shortens, and the inclined guide rod 36 rises at the same time, guiding the support plates 34 on both sides so that the support plates 34 on both sides are close to each other. 4 are close to each other, and there is a gap between them (it is assumed that the friction force between the vertical plate 29 and the friction damping block 28 is sufficient to drive the two support plates 34 closer, lift the guide frame 35, and shrink the telescopic rod 37, and the vertical plate 29 does not fall). At this time, the telescopic rod 37 still has space to shrink (the telescopic rod 37 is a conventional two rods, one of which is hollow, and the hollow rod is sleeved outside the other rod, and the two rods can move relative to each other to achieve expansion and contraction). At this time, the manual rod 3, handwheel 4, cylinder piston 7, cross plate 13, slide column 26 and other structures are lowered so that the flat surface of the lower surface of the slide column 26 is supported on the two support plates 34. It is assumed that the valve is in the open state at this time.

[0063] When the valve needs to be closed, the manual rod 3, hand wheel 4, cylinder piston 7, cross plate 13, slide column 26 and other structures are lifted first, and the slide column 26 drives the anti-falling baffle 31, vertical plate 29 and other structures to rise. After the anti-falling baffle 31 contacts the guide frame 35, it drives the guide frame 35 to rise and the telescopic rod 37 is compressed. Then it continues to rise until the telescopic rod 37 can no longer retract. The slide column 26 drives the anti-falling baffle 31, vertical plate 29 and other structures to continue to rise. It is blocked by the guide frame 35, overcoming the friction between the vertical plate 29 and the friction damping block 28, so that the slide column 26 rises relative to the anti-falling baffle 31 and vertical plate 29. At this time, the vertical plate 29, the conical separation block 30, and the anti-falling baffle 31 descend relative to the slide column 26, and the conical separation block 30 extends from the lower part of the slide column 26. , push down the manual rod 3, handwheel 4, cylinder piston 7, cross plate 13, slide post 26 and other structures, and the conical separation block 30 is inserted into the gap between the two support plates 34 and pushes the two support plates 34 apart. Since the upper side of the slide post 26 is an arc surface, the pushed support plate 34 contacts the arc surface of the slide post 26, thereby further separating the two support plates 34, causing the slide post 26 to descend. Under the elastic force of the compression spring 10, the manual rod 3, handwheel 4, cylinder piston 7, cross plate 13, slide post 26, cylinder push rod 12, valve stem 18, valve core 21 and other structures are pushed down to close the valve, and the slide post 26 is continued to be pressed down until it contacts the lower top plate 32, and the vertical plate 29, the conical separation block 30, and the anti-falling baffle 31 are pushed up and reset to facilitate the next use.

[0064] It is assumed that the support plate 34 can be stably installed in the T-slot 33 , and the structural strength is sufficient to support the sliding column 26 and other structures.

[0065] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure signs in the claims should not be regarded as limiting the claims involved.

[0066] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatic opening and closing valve capable of elastic reset, characterized in that: include: Cylinder body (1), cylinder cover (2), cylinder piston (7), compression spring (10), air inlet joint (11), cylinder push rod (12), bracket (14), valve stem (18), valve core (21), valve body (16) and inlet and outlet (17); The cylinder body (1) is hollow and has an upper opening, the cylinder head (2) is connected to the upper opening of the cylinder body (1), the cylinder piston (7) is slidably connected in the cylinder body (1), and the upper and lower ends of the compression spring (10) are respectively supported between the cylinder head (2) and the cylinder piston (7), the air intake joint (11) is connected to the lower part of the side wall of the cylinder body (1), a support ring is provided on the lower side of the cylinder piston (7), and the air intake joint (11) is located at the interval between the bottom of the cylinder body (1) and the lower surface of the cylinder piston (7); The valve body (16) is connected to the lower side of the cylinder body (1) through a bracket (14), a valve core (21) is provided in the valve cavity of the valve body (16), and an inlet and outlet (17) corresponding to the valve cavity are provided on both sides of the valve body (16), the upper part of the valve core (21) is connected to the valve stem (18), the valve stem (18) passes through the valve body (16) and extends to the upper side of the valve body (16), the upper part of the valve stem (18) is connected to the cylinder push rod (12), and the cylinder push rod (12) is connected to the bottom end of the cylinder piston (7).

2. The pneumatic opening and closing valve capable of elastic reset according to claim 1, characterized in that: An open elastic retaining ring (6) is embedded in the upper opening of the cylinder body (1), and the open elastic retaining ring (6) is pressed on the upper side of the cylinder cover (2).

3. The pneumatic opening and closing valve capable of elastic reset according to claim 1, characterized in that: A piston ring (8) is sleeved on the outer wall of the cylinder piston (7), and the outer wall of the piston ring (8) is in contact with the inner wall of the cylinder body (1).

4. The pneumatic opening and closing valve capable of elastic reset according to claim 1, characterized in that: The upper surface of the cylinder piston (7) is connected to a manual rod (3), the manual rod (3) passes through the cylinder head (2) and extends to the upper side of the cylinder head (2), the top end of the manual rod (3) is connected to a hand wheel (4) through a cap nut (5), and a sealing ring is embedded in the connection between the upper part of the cylinder head (2) and the manual rod (3), and the sealing ring is sleeved on the outer wall of the manual rod (3).

5. The pneumatic opening and closing valve capable of elastic reset according to claim 1, characterized in that: A piston buffer pad (9) is provided on the upper surface of the cylinder piston (7).

6. The pneumatic opening and closing valve capable of elastic reset according to claim 4, characterized in that: The left and right sides of the bracket (14) are connected with a mounting plate (23) and an indicator plate (22) by screws. The mounting plate (23) and the indicator plate (22) extend toward the inner side of the bracket (14) to form a clamping channel. The mounting plate (23) is fixedly connected to the travel switch (24) by screws. The lower middle part of the outer wall of the cylinder push rod (12) is fixedly connected with a cross plate (13). The four ends of the cross plate (13) form four side plates. The operating rods of the travel switches (24) on both sides are placed on the two side plates of the cross plate (13). The other two side plates of the cross plate (13) are slidably inserted into the clamping channels on both sides.

7. The pneumatic opening and closing valve capable of elastic reset according to claim 1, characterized in that: An external threaded sleeve (19) is provided on the lower side of the outer wall of the cylinder push rod (12), and a limiting nut (20) is threadedly connected to the outer wall of the external threaded sleeve (19), and the limiting nut (20) is located on the upper side of the bottom end of the bracket (14).

8. The pneumatic opening and closing valve capable of elastic reset according to claim 1, characterized in that: The lower surface of the bracket (14) is fixedly connected with an inner thread sleeve (15), and the upper side of the outer wall of the valve body (16) is provided with an outer thread joint that matches the inner thread sleeve (15), and the inner thread sleeve (15) and the outer thread joint are threadedly connected.

9. The pneumatic opening and closing valve capable of elastic reset according to claim 8, characterized in that: A second sealing ring is embedded in the connection between the inner thread sleeve (15) and the outer thread joint, and the second sealing ring is sleeved on the outer wall of the valve stem (18). A third sealing ring is embedded in the connection between the bottom of the cylinder body (1) and the cylinder push rod (12), and the third sealing ring is sleeved on the outer wall of the cylinder push rod (12).

10. The pneumatic opening and closing valve capable of elastic reset according to claim 6, characterized in that: The indicator plate (22) is provided with a movable groove (25), and a sliding column (26) is connected to the corresponding side plate of the cross plate (13). The sliding column (26) is slidably connected in the movable groove (25) and extends to the outside of the movable groove (25). The upper and middle parts of the sliding column (26) are in an arc shape, and the lower surface of the sliding column (26) is straight. A movable groove (27) is longitudinally provided on the sliding column (26), and friction damping blocks (28) are provided on both sides of the interior of the movable groove (27). A vertical plate (29) is movably inserted into the interior of the movable groove (27), and the vertical plate (29) is in surface contact with the friction damping block (28). An anti-falling baffle (31) is provided on the upper surface of the vertical plate (29), and a pointed cone separation block (30) is provided at the bottom end of the vertical plate (29). The indicator plate ( Two T-shaped slots (33) are provided on the upper side of the outer wall of the indicator plate (22), and the two T-shaped slots (33) are symmetrically arranged on both sides of the movable through slot (25). The two T-shaped slots (33) are slidably connected to support plates (34), and the lower parts of the two support plates (34) close to each other are both arranged in an inclined surface shape. The upper side of the outer wall of the indicator plate (22) is connected to a telescopic rod (37), and the lower side of the telescopic end of the telescopic rod (37) is connected to a guide frame (35). Both sides of the bottom end of the guide frame (35) are connected to inclined guide rods (36). The inclined guide rods (36) on both sides are respectively located at the lower parts of the two support plates (34). The lower corner of the support plate (34) close to the inclined guide rod (36) is rotatably connected to a roller through a rotating shaft. The bottom end of the outer wall of the movable through slot (25) is provided with a lower top plate (32).

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