Pneumatic hydraulic cylinder

Abstract

The application discloses a kind of pneumatic hydraulic cylinders, belongs to the field of supercharged cylinder.The pneumatic hydraulic cylinder of the application includes cavity inside cylinder body, and cylinder body is provided with air hole;Pressure ring is movably arranged between the two ends of cavity, and cavity is divided into first chamber and second chamber;Elastic member is arranged in first chamber, and compression clamp is arranged between the inner wall of first chamber and pressure ring;First cylinder barrel is arranged in second chamber, and first cylinder barrel is provided with first piston and second piston with plug rod, first piston divides the hydraulic cavity of first cylinder barrel into hydraulic area and pneumatic area, hydraulic area is arranged close to pressure ring, second piston is movably arranged in hydraulic area, plug rod penetrates the inner wall of hydraulic area and is connected with pressure ring, and first piston reciprocates with pressure ring.The application sets first cylinder barrel, first piston and second piston to form hydraulic system, controls hydraulic action by pneumatic control, reduces the diameter of first piston, facilitates to reduce the size of pneumatic hydraulic cylinder, makes it proportional with valve body.

Description

Technical Field

[0001] This invention belongs to the field of booster cylinders, specifically, it relates to a pneumatic hydraulic cylinder. Background Technology

[0002] Currently, the cylinder control air pressure of ultra-high pressure small-diameter valves is usually between 0.6 and 0.8 MPa. In order to achieve a larger sealing force, the cylinder piston diameter required for simple pneumatic control is relatively large. This will result in the cylinder head being too large in size, which is disproportionate to the valve body and inconvenient to use.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art. The purpose is to provide a pneumatic hydraulic cylinder, which is composed of a first cylinder, a first piston and a second piston to form a hydraulic system. The cylinder allows air to be introduced and vented into a second chamber outside the first cylinder and into a pneumatic pressure zone through an air hole, so as to realize pneumatic control of hydraulic movement. The hydraulic system can amplify the force and reduce the diameter of the first piston while amplifying the sealing force, so as to reduce the size of the pneumatic hydraulic cylinder, make it proportionally coordinated with the valve body, and have better sealing performance.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is to provide a pneumatic hydraulic cylinder, comprising,

[0006] The cylinder body has an internal cavity and air holes are provided on the cylinder body;

[0007] A pressure ring is movably disposed between the two ends of the cavity, dividing the cavity into a first chamber and a second chamber;

[0008] An elastic element is disposed in the first chamber and is compressed and clamped between the inner wall of the first chamber and the pressure ring.

[0009] A first cylinder is disposed in the second chamber. The first cylinder is provided with a first piston and a second piston with a piston rod. The first piston divides the hydraulic chamber of the first cylinder into a hydraulic zone and a pneumatic zone. The hydraulic zone is disposed close to the pressure ring. The second piston is movably disposed in the hydraulic zone. The piston rod passes through the inner wall of the hydraulic zone and is connected to the pressure ring. The first piston reciprocates with the pressure ring.

[0010] The air vents are connected to the second chamber outside the first cylinder and the air pressure zone, respectively, and are used to control the reciprocating motion of the pressure ring and the first piston by inward air intake and exhaust.

[0011] Furthermore, the cylinder body is provided with a through first channel and a second channel, both of which are connected to the air hole. The first channel is connected to the second chamber outside the first cylinder, and the second channel is connected to the air pressure zone.

[0012] Preferably, the axial direction of the air outlet of the first channel is the same as the moving direction of the pressure ring, and the axial direction of the air outlet of the second channel is the same as the moving direction of the first piston.

[0013] Furthermore, the pressure ring includes a first cylindrical body and an annular portion;

[0014] The annular portion is sleeved outside the opening of the first cylinder and is in sealed contact with the inner circumferential wall of the cavity. The elastic element is sleeved outside the first cylinder and is compressed between the inner wall of one end of the first chamber and the annular portion.

[0015] Furthermore, the cylinder body includes a second cylinder barrel and a cylinder head, with one end of the cylinder head having an opening that extends into the opening at one end of the second cylinder barrel to form the cavity;

[0016] There is a certain distance between one end face of the cylinder head and the other end of the second cylinder, and the pressure ring is movably disposed within the distance.

[0017] Furthermore, the moving directions of the first piston and the second piston are the same as the moving direction of the pressure ring.

[0018] Furthermore, the first cylinder includes a second cylinder and a third cylinder connected in sequence, wherein the end of the third cylinder opposite to the second cylinder is an open end, and the outer peripheral wall of the third cylinder is connected to the inner peripheral wall of the other end of the second cylinder.

[0019] The inner diameter of the third cylinder is larger than that of the second cylinder. The second piston is disposed inside the second cylinder. The piston rod dynamically seals and extends out of the second cylinder. The first piston is disposed inside the third cylinder.

[0020] Furthermore, a groove is formed in the end face of the other end of the second cylinder, and an annular platform is formed between the groove and the inner peripheral wall of the second cylinder;

[0021] The annular portion moves on the inner peripheral wall of the second cylinder and is located between one end of the cylinder head and the annular platform.

[0022] One end of the second cylinder extends into the first cylinder, and the third cylinder is disposed in the groove and the outer peripheral wall of the third cylinder is connected to the inner wall of the groove.

[0023] Furthermore, the pressure zone is formed between the bottom of the groove and the first piston.

[0024] Furthermore, both the first channel and the second channel are disposed inside the second cylinder.

[0025] The first channel is connected to the air hole, first extending to the bottom of the annular platform, and then extending to the annular platform along the moving direction of the pressure ring;

[0026] The second channel communicates with the air hole, first extending to the bottom of the groove, and then extending along the moving direction of the first piston to the bottom of the groove.

[0027] Furthermore, a boss is formed by protruding one end face of the first piston, which extends into the second cylinder. A push rod is connected to the other end of the first piston, and one end of the push rod passes through the bottom of the groove and is connected to a valve plug.

[0028] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0029] (1) In this invention, a hydraulic system is formed by a first cylinder, a first piston, and a second piston. Air is introduced into the second chamber and the air pressure zone outside the first cylinder through the air hole, and the pressure ring and the second piston are controlled to reciprocate. In turn, the reciprocating motion of the first piston is controlled, so as to realize pneumatic control of hydraulic. The hydraulic system can amplify the force. While amplifying the sealing force, the diameter of the first piston can be reduced, which makes it easier to reduce the size of the pneumatic hydraulic cylinder, so that it is proportionally coordinated with the valve body, and has better sealing performance.

[0030] (2) In this invention, the inner wall of the cylinder head protrudes from the inner wall of the second cylinder, so that the pressure ring can move within the distance range between the inner wall of the second cylinder and one end of the cylinder head, which is opposite to the direction of movement of the pressure ring, and can limit the pressure ring.

[0031] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0032] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0033] Figure 1 This is a schematic diagram of a pneumatic hydraulic cylinder according to the present invention.

[0034] In the diagram: 1. Cylinder block; 11. Second cylinder barrel; 111. Air port; 112. First channel; 113. Second channel; 114. Groove; 115. First chamber; 116. Second chamber; 12. Cylinder head; 2. Pressure ring; 21. First cylinder body; 22. Circular part; 3. Elastic element; 4. First cylinder barrel; 41. Second cylinder body; 411. Hydraulic zone; 42. Third cylinder body; 421. Pneumatic zone; 5. First piston; 6. Second piston; 7. Push rod.

[0035] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] like Figure 1 As shown, the present invention provides a pneumatic hydraulic cylinder, which includes a cylinder body 1, a pressure ring 2, an elastic element 3, and a first cylinder barrel 4.

[0040] The cylinder body 1 has an internal cavity and an air hole 111 is provided on the cylinder body 1.

[0041] The pressure ring 2 is movably disposed between the two ends of the cavity, dividing the cavity into a first chamber 115 and a second chamber 116.

[0042] The elastic element 3 is disposed in the first chamber 115 and is compressed and clamped between the inner wall of the first chamber 115 and the pressure ring 2.

[0043] The first cylinder 4 is disposed in the second chamber 116. The first cylinder 4 is provided with a first piston 5 and a second piston 6 with a piston rod. The first piston 5 divides the hydraulic chamber of the first cylinder 4 into a hydraulic zone 411 and a pneumatic zone 421. The hydraulic zone 411 is disposed close to the pressure ring 2. The second piston 6 is movably disposed in the hydraulic zone 411. The piston rod passes through the inner wall of the hydraulic zone 411 and is connected to the pressure ring 2. The first piston 5 reciprocates with the pressure ring 2.

[0044] The air vent 111 is connected to the second chamber 116 outside the first cylinder 4 and the air pressure zone 421, respectively, and is used to control the reciprocating motion of the pressure ring 2 and the first piston 5 by inward air intake and exhaust.

[0045] The air vent 111 is connected to the second chamber 116 outside the first cylinder 4 and the air pressure zone 421, respectively, and is used to control the reciprocating motion of the pressure ring 2 by allowing air to enter and exhausting air.

[0046] In this invention, a hydraulic system is formed by the first cylinder 4, the first piston 5, and the second piston 6. Air is introduced into the second chamber 116 outside the first cylinder 4 and the air pressure zone 421 through the air hole 111, controlling the reciprocating motion of the pressure ring 2 and the second piston 6, thereby controlling the reciprocating motion of the first piston 5. This achieves pneumatic control of hydraulic motion. The hydraulic system can amplify the force, and while amplifying the sealing force, it can reduce the diameter of the first piston 5, which facilitates the reduction of the size of the pneumatic hydraulic cylinder, making it proportionally coordinated with the valve body, and providing better sealing performance.

[0047] Specifically, the vent 111 is connected to a control valve, which is a normally closed valve. A solenoid valve can be installed to control the opening and closing of the vent 111, allowing control gas to be introduced into the vent 111 or returned through the vent 111 via its original path. The control gas is the gas that enters and exits the vent 111.

[0048] The pressure ring 2 slides and seals against the inner peripheral wall of the cavity, dividing the cavity into the first chamber 115 and the second chamber 116.

[0049] The elastic element 3 generates elastic force after compression. The elastic element 3 is configured as a spring. The spring is pre-compressed and disposed in the cavity. The spring is sandwiched between the first chamber 115 and the pressure ring 2. The extension and retraction direction of the spring is the same as the movement direction of the pressure ring 2.

[0050] The first cylinder 4 has a hydraulic chamber and is equipped with a first piston 5 and a second piston 6. The second piston 6 divides the hydraulic chamber into a hydraulic zone 411 and a pneumatic zone 421. The second piston 6 is disposed in the hydraulic zone 411, and the space between one end of the second piston 6 and one end of the first piston 5 is filled with hydraulic oil. The second piston 6 is equipped with a piston rod, which passes through the inner wall of the hydraulic zone 411 and connects to the pressure ring 2. The second piston 6 moves together with the pressure ring 2. The other end of the first piston 5 is connected to a valve core mechanism that passes through the pneumatic zone 421 and the inner wall of the cylinder 1. The valve core mechanism is used to open and close the valve port of the pneumatic hydraulic valve, controlling the opening and closing of the pneumatic hydraulic valve.

[0051] The force-bearing area of ​​the first piston 5 is greater than that of the second piston 6. The first cylinder 4, the first piston 5, the second piston 6, and the hydraulic oil disposed between the first piston 5 and the second piston 6 together constitute a hydraulic system.

[0052] Preferably, the cylinder body 1, pressure ring 2, elastic element 3 and first cylinder barrel 4 are arranged coaxially.

[0053] When control gas is filled into the second chamber 116 outside the first cylinder 4, the control gas will not flow into the first chamber 115.

[0054] The pneumatic hydraulic cylinder is installed inside the pneumatic hydraulic valve to control the opening and closing of the pneumatic hydraulic valve.

[0055] When the pneumatic hydraulic valve is in the normally closed state, the air pressure in the second chamber 116 outside the first cylinder 4 and in the air pressure zone 421 is 0 MPa. The elastic element 3 presses the pressure ring 2, that is, presses the second piston 6. Under the elastic force of the elastic element 3, the second piston 6 presses the hydraulic oil between the first piston 5 and the second piston 6. The hydraulic oil applies pressure to the first piston 5, and then to the valve core mechanism connected to the other end of the first piston 5. At this time, the valve core mechanism blocks the valve port of the pneumatic hydraulic valve. Because the hydraulic oil presses the first piston 5, the force-bearing area of ​​the first piston 5 is greater than that of the second piston 6. The force acting on the first piston 5 is greater than that acting on the second piston 6, which can amplify the force. Therefore, the sealing force acting on the valve core mechanism becomes larger, and the valve port of the pneumatic hydraulic valve is not easily opened, which can improve the sealing performance of the pneumatic hydraulic valve. It can make the pneumatic hydraulic valve stay in the closed state without control air and have good sealing performance.

[0056] When the pneumatic hydraulic valve needs to be opened, control air enters the second chamber 116 outside the first cylinder 4 and the air pressure zone 421 through the air hole 111. Under the action of air pressure, the pressure ring 2 moves and compresses the elastic element 3. The second piston 6 moves away from the first piston 5 along with the pressure ring 2. The pressure of the hydraulic oil on the first piston 5 decreases. At the same time, the control air entering the air pressure zone 421 will generate a thrust on the first piston 5. When the thrust is greater than the pressure of the hydraulic oil on the first piston 5, the first piston 5 moves, and the valve core mechanism moves accordingly until the valve port is opened, and the pneumatic hydraulic valve is opened.

[0057] The control gas pressure is usually 0.6 to 0.8 MPa.

[0058] When the pneumatic hydraulic valve needs to be closed, the control air in the second chamber 116 outside the first cylinder 4 and the air pressure zone 421 is first discharged through the air hole 111 until the air pressure in the second chamber 116 outside the first cylinder 4 and the air pressure zone 421 are both 0MPa. Under the elastic force of the elastic element 3, the elastic element 3 pushes the pressure ring 2 and the second piston 6 together to move closer to the first piston 5. The pressure of the hydraulic oil on the first piston 5 increases, pushing the first piston 5 to move. The valve core mechanism moves accordingly until it blocks the valve port, and the pneumatic hydraulic valve is closed.

[0059] The elastic force of the elastic element 3 is F1, the hydraulic oil pressure in the hydraulic zone 411 is P, the force-bearing area of ​​the first piston 5 is S1, and the force-bearing area of ​​the second piston 6 is S2. Under the action of the elastic force F1 of the elastic element 3, the second piston 6 presses the hydraulic oil in the hydraulic zone 411. The hydraulic oil pressure in the hydraulic zone 411 is P = F1 / S2. According to Pascal's principle, the pressure of hydraulic oil is equal at all points in a closed container. Therefore, the hydraulic oil acting on the first piston 5 will generate the valve closing force F2 = F1 / S2S1 of the pneumatic hydraulic valve. The elastic force F1 of the elastic element 3 acting on the second piston 6 is amplified through the hydraulic system, effectively reducing the diameter of the first piston 5 required only by the elastic force, thus avoiding the problem of proportional inconsistency. This amplification effect will increase as the ratio of the force-bearing areas of the first piston 5 and the second piston 6 increases.

[0060] The cylinder body 1 is provided with a through first channel 112 and a second channel 113. Both the first channel 112 and the second channel 113 are connected to the air hole 111. The first channel 112 is connected to the second chamber 116 outside the first cylinder 4, and the second channel 113 is connected to the air pressure zone 421.

[0061] Preferably, the axial direction of the air outlet of the first channel 112 is the same as the moving direction of the pressure ring 2, and the axial direction of the air outlet of the second channel 113 is the same as the moving direction of the first piston 5.

[0062] Specifically, when control air is introduced into the air hole 111, the control air first enters the first channel 112 and the second channel 113, and then enters the second chamber 116 outside the first cylinder 4 and the air pressure zone 421 respectively, increasing the air pressure in the corresponding space, which can cause the valve core mechanism to open the valve; when the air hole 111 exhausts, the control air will return along the original path, reducing the air pressure in the corresponding space, which can cause the valve core mechanism to close the valve.

[0063] The axial direction of the air outlet of the first channel 112 is the same as the moving direction of the pressure ring 2. When the air hole 111 is inlet, the control air can flow out from the air outlet and act directly on the pressure ring 2, reducing the energy loss of the control air and reducing the time required to push the pressure ring 2. When the control air is exhausted, this setting can speed up the exhaust of the control air.

[0064] The axial direction of the air outlet of the second channel 113 is the same as the moving direction of the first piston 5. When air enters through the air hole 111, the control air can flow out of the air outlet and act directly on the first piston 5, reducing the energy loss of the control air and the time required to push the first piston 5. When the control air is exhausted, this arrangement can speed up the exhaust of the control air. This is beneficial to reducing the time required for the pneumatic hydraulic valve to open and close.

[0065] The pressure ring 2 includes a first cylindrical body 21 and an annular portion 22.

[0066] The annular portion 22 is sleeved outside the opening of the first cylindrical body 21 and is in sealed contact with the inner circumferential wall of the cavity. The elastic element 3 is sleeved outside the first cylindrical body 21 and is compressed between the inner wall of one end of the first chamber 115 and the annular portion 22.

[0067] Specifically, the opening of the first cylindrical body 21 faces the first cylinder 4, the inner peripheral wall of the annular portion 22 is sleeved on the outside of the opening of the first cylindrical body 21, and the outer peripheral wall of the annular portion 22 is in sealing contact with the inner peripheral wall of the cavity. The surface of the annular portion 22 is flush with the end face of the opening of the first cylindrical body 21.

[0068] The two ends of the elastic element 3 abut against the top wall of the first chamber 115 and the annular portion 22, respectively, and the elastic element 3 is pre-compressed.

[0069] The cylinder body 1 includes a second cylinder barrel 11 and a cylinder head 12. One end of the cylinder head 12 is open and extends into the opening at one end of the second cylinder barrel 11 to form the cavity.

[0070] There is a certain distance between one end face of the cylinder head 12 and the other end of the second cylinder 11, and the pressure ring 2 is movably disposed within the distance.

[0071] Preferably, the first cylindrical body 21 and the annular portion 22 are integrally formed.

[0072] In this invention, the inner wall of the cylinder head 12 protrudes from the inner wall of the second cylinder 11, so that the pressure ring 2 can move within the distance range between the inner wall of the second cylinder 11 opposite to the moving direction of the pressure ring 2 and one end of the cylinder head 12, thereby limiting the position of the pressure ring 2.

[0073] Specifically, the open end of the second cylinder 11 is sleeved on the open end of the cylinder head 12, and the inner peripheral wall of the second cylinder 11 is connected to the outer peripheral wall of the cylinder head 12, so the inner wall of the cylinder head 12 protrudes from the inner wall of the second cylinder 11.

[0074] The inner wall of the second cylinder 11 that is opposite to the moving direction of the pressure ring 2 refers to the bottom wall of the second cylinder 11. There is a gap between it and one end of the cylinder head 12. The outer peripheral wall of the annular part 22 is in sealed contact with the inner peripheral wall of the second cylinder 11 and moves within the gap range, which can limit the position of the pressure ring 2.

[0075] Preferably, the annular portion 22 contacts one end of the cylinder head 12 to control the pneumatic-hydraulic valve to open, and the annular portion 22 contacts the inner wall of the second cylinder 11 opposite to the moving direction of the pressure ring 2 to control the pneumatic-hydraulic valve to close.

[0076] More preferably, the second cylinder 11 and the cylinder head 12 are detachably connected.

[0077] In one embodiment of the present invention, the moving direction of the first piston 5 is different from the moving direction of the second piston 6.

[0078] Specifically, the space between the first piston 5 and the second piston 6 is filled with hydraulic oil, and the hydraulic oil pressure is equal everywhere. The movement direction of the first piston 5 can be set in various ways, and can be reasonably set according to actual needs.

[0079] In another embodiment of the present invention, the moving direction of the first piston 5 and the second piston 6 is the same as the moving direction of the pressure ring 2.

[0080] Specifically, when the direction of movement of the first piston 5 is different from that of the second piston 6, the size of the first cylinder 4 in other directions will increase, the maximum diameter of the first cylinder 4 will increase, and it will be inconvenient to use.

[0081] The first piston 5 and the second piston 6 move in the same direction as the pressure ring 2. The first cylinder 4 extends vertically, which helps to reduce the maximum diameter of the first cylinder 4 and reduce the size of the pneumatic hydraulic cylinder, so that it can be adapted to the valve body of the pneumatic hydraulic valve.

[0082] Preferably, the cylinder body 1, pressure ring 2, elastic element 3, first cylinder barrel 4, first piston 5 and second piston 6 are arranged coaxially.

[0083] The first cylinder 4 includes a second cylinder 41 and a third cylinder 42 connected in sequence. The opposite end of the third cylinder 42 and the second cylinder 41 is an open end. The outer peripheral wall of the third cylinder 42 is connected to the inner peripheral wall of the other end of the second cylinder 11.

[0084] The inner diameter of the third cylinder 42 is larger than the inner diameter of the second cylinder 41. The second piston 6 is disposed inside the second cylinder 41. The piston rod dynamically seals through the outside of the second cylinder 41. The first piston 5 is disposed inside the third cylinder 42.

[0085] Specifically, the second cylinder 41 and the third cylinder 42 are coaxially connected. The outer peripheral wall of the first piston 5 is sealed to the inner peripheral wall of the third cylinder 42, and the outer peripheral wall of the second piston 6 is sealed to the inner peripheral wall of the second cylinder 41. The diameter of the first piston 5 is larger than the diameter of the second piston 6.

[0086] The other end of the second piston 6 is connected to one end of the piston rod, and the other end of the piston rod passes through the top wall of the second cylinder 41 and the top wall of the first cylinder 21 in sequence. The other end of the piston rod is connected to the first cylinder 21.

[0087] Preferably, the second cylindrical body 41 and the third cylindrical body 42 are integrally formed.

[0088] A groove 114 is formed in the end face of the other end of the second cylinder 11, and an annular platform is formed between the groove 114 and the inner peripheral wall of the second cylinder 11.

[0089] The annular portion 22 moves on the inner peripheral wall of the second cylinder 11 and is located between one end of the cylinder head 12 and the annular platform.

[0090] One end of the second cylindrical body 41 extends into the first cylindrical body 21, and the third cylindrical body 42 is disposed in the groove 114 and the outer peripheral wall of the third cylindrical body 42 is connected to the inner wall of the groove 114.

[0091] Specifically, the bottom wall of the second cylinder 11 is recessed inward to form the groove 114, and the edge of the groove 114 and the inner peripheral wall of the second cylinder 11 form the annular platform. The annular platform and one end of the cylinder head 12 are separated by a distance.

[0092] When the pressure ring 2 moves downward, one end of the second cylinder 41 extends into the first cylinder 21. This arrangement reduces the overall length of the pneumatic hydraulic cylinder in the vertical direction. The lower end of the third cylinder 42 contacts the bottom of the groove 114, and the upper end face of the third cylinder 42 is flush with the annular platform. The outer peripheral wall of the third cylinder 42 is in sealing contact with the side wall of the groove 114.

[0093] The pressure zone 421 is formed between the bottom of the groove 114 and the first piston 5.

[0094] Specifically, the lower end of the third cylinder 42 is open, and the bottom of the groove 114 seals the opening, which reduces the length of the first cylinder 4. A pressure zone 421 is formed between the first piston 5 and the bottom of the groove 114. The bottom of the groove 114 is connected to the air outlet of the second channel 113.

[0095] The sidewall of the groove 114 is configured with a variable diameter, and the outer periphery of the third cylinder 42 is adapted to the sidewall of the groove 114, which can enhance the sealing between the third cylinder 42 and the groove 114.

[0096] Both the first channel 112 and the second channel 113 are located inside the second cylinder 11.

[0097] The first channel 112 is connected to the air hole 111, first extending to the bottom of the annular platform, and then extending to the annular platform along the moving direction of the pressure ring 2.

[0098] The second channel 113 communicates with the air hole 111, first extending to the bottom of the groove 114, and then extending along the moving direction of the first piston 5 to the bottom of the groove 114.

[0099] Specifically, the first channel 112 includes a first intake channel and a second intake channel connected in sequence. The first intake channel extends horizontally from the outer peripheral wall of the second cylinder 11 to below the annular platform, and its extension length is greater than the length from the outer peripheral wall of the second cylinder 11 to the annular platform. The second intake channel extends along the moving direction of the first piston 5 to the annular platform, and the outlet of the second intake channel faces the pressure ring 2.

[0100] The second channel 113 includes a third air intake channel, a fourth air intake channel, a fifth air intake channel, and a sixth air intake channel that are connected in sequence; the third air intake channel and the first air intake channel are the same channel; the extension direction of the fourth air intake channel is opposite to the extension direction of the second air intake channel; the fifth air intake channel extends horizontally below the groove 114; and the sixth air intake channel extends along the moving direction of the first piston 5 to the bottom of the groove 114 and is positioned directly opposite the first piston 5.

[0101] One end face of the first piston 5 protrudes to form a boss, which extends into the second cylinder 41. The other end of the first piston 5 is connected to a push rod 7, one end of which passes through the bottom of the groove 114 and is connected to a valve plug.

[0102] Specifically, the valve core mechanism includes the push rod 7 and the valve plug. One end of the push rod 7 is connected to the valve plug, and the other end of the push rod 7 is connected to the other end of the first piston 5. The push rod 7 reciprocates with the first piston 5, and the valve plug reciprocates accordingly, thus opening and closing the pneumatic hydraulic valve.

[0103] The first piston 5 has a protruding end face that forms the boss, which extends into the second cylinder 41.

[0104] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pneumatic hydraulic cylinder, characterized in that: include, The cylinder (1) has an internal cavity and is provided with air holes (111). The pressure ring (2) is movably disposed between the two ends of the cavity, dividing the cavity into a first chamber (115) and a second chamber (116). The elastic element (3) is disposed in the first chamber (115) and is compressed between the inner wall of the first chamber (115) and the pressure ring (2); The first cylinder (4) is disposed in the second chamber (116). The first cylinder (4) is provided with a first piston (5) and a second piston (6) with a piston rod. The first piston (5) divides the hydraulic chamber of the first cylinder (4) into a hydraulic zone (411) and a pneumatic zone (421). The hydraulic zone (411) is disposed close to the pressure ring (2). The second piston (6) is movably disposed in the hydraulic zone (411). The piston rod passes through the inner wall of the hydraulic zone (411) and is connected to the pressure ring (2). The second piston (6) reciprocates with the pressure ring (2). The air hole (111) is connected to the second chamber (116) outside the first cylinder (4) and the air pressure zone (421) respectively, and is used to control the reciprocating motion of the pressure ring (2) and the first piston (5) for inward air intake and exhaust. The first cylinder (4) includes a second cylinder (41) and a third cylinder (42) connected in sequence. The opposite end of the third cylinder (42) and the second cylinder (41) is an open end. The inner diameter of the third cylinder (42) is larger than the inner diameter of the second cylinder (41). The second piston (6) is disposed inside the second cylinder (41). The piston rod is dynamically sealed and passes through the second cylinder (41). The first piston (5) is disposed inside the third cylinder (42).

2. The pneumatic hydraulic cylinder according to claim 1, characterized in that: The cylinder body (1) is provided with a through first channel (112) and a second channel (113). Both the first channel (112) and the second channel (113) are connected to the air hole (111). The first channel (112) is connected to the second chamber (116) outside the first cylinder (4), and the second channel (113) is connected to the air pressure zone (421).

3. The pneumatic hydraulic cylinder according to claim 2, characterized in that: The axial direction of the air outlet of the first channel (112) is the same as the moving direction of the pressure ring (2), and the axial direction of the air outlet of the second channel (113) is the same as the moving direction of the first piston (5).

4. The pneumatic hydraulic cylinder according to claim 2, characterized in that: The pressure ring (2) includes a first cylindrical body (21) and an annular portion (22); The annular part (22) is sleeved outside the opening of the first cylinder (21) and is in sealed contact with the inner circumferential wall of the cavity. The elastic element (3) is sleeved outside the first cylinder (21) and compressed between the inner wall of one end of the first chamber (115) and the annular part (22).

5. The pneumatic hydraulic cylinder according to claim 4, characterized in that: The cylinder body (1) includes a second cylinder barrel (11) and a cylinder head (12). One end of the cylinder head (12) is open and extends into the opening at one end of the second cylinder barrel (11) to form the cavity. There is a certain distance between one end face of the cylinder head (12) and the other end of the second cylinder (11), and the pressure ring (2) is movably disposed within the distance.

6. The pneumatic hydraulic cylinder according to claim 5, characterized in that: The moving direction of the first piston (5) and the second piston (6) is the same as the moving direction of the pressure ring (2).

7. The pneumatic hydraulic cylinder according to claim 5, characterized in that: The outer peripheral wall of the third cylinder (42) is connected to the inner peripheral wall of the other end of the second cylinder (11).

8. The pneumatic hydraulic cylinder according to claim 7, characterized in that: A groove (114) is formed in the end face of the other end of the second cylinder (11), and an annular platform is formed between the groove (114) and the inner peripheral wall of the second cylinder (11). The annular portion (22) moves on the inner peripheral wall of the second cylinder (11) and is located between one end of the cylinder head (12) and the annular platform. One end of the second cylinder (41) extends into the first cylinder (21), and the third cylinder (42) is disposed in the groove (114) and the outer peripheral wall of the third cylinder (42) is connected to the inner wall of the groove (114).

9. The pneumatic-hydraulic cylinder according to claim 8, characterized in that: The pressure zone (421) is formed between the bottom of the groove (114) and the first piston (5).

10. The pneumatic-hydraulic cylinder according to claim 8, characterized in that: Both the first channel (112) and the second channel (113) are located inside the second cylinder (11); The first channel (112) is connected to the air hole (111), first extending to the bottom of the annular platform, and then extending to the annular platform along the moving direction of the pressure ring (2); The second channel (113) communicates with the air hole (111), first extending to the bottom of the groove (114), and then extending along the moving direction of the first piston (5) to the bottom of the groove (114).

11. The pneumatic-hydraulic cylinder according to any one of claims 8-10, characterized in that: One end face of the first piston (5) protrudes to form a boss, which extends into the second cylinder (41). The other end of the first piston (5) is connected to a push rod (7), one end of which passes through the bottom of the groove (114) and is connected to a valve plug.

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