Pneumatic control system

Abstract

The utility model relates to the technical field of taking compressed gas as a power source, and discloses a pneumatic control system. The pneumatic control system comprises an air cylinder and an air control valve, one end of the air cylinder is provided with a propelling pipe connector, the other end of the air cylinder is provided with a reset pipe connector, and the air control valve comprises a valve body provided with a cavity and a valve rod installed in sliding fit with the cavity. A first vent hole, a second vent hole, a third vent hole, a fourth vent hole and a fifth vent hole which are communicated with the cavity are formed in the valve body, a sixth vent hole corresponding to the second vent hole is formed in the valve body in the radial direction, and a seventh vent hole corresponding to the fourth vent hole is formed in the valve body; the second vent hole and the sixth vent hole are communicated with the reset pipe joint, and the fourth vent hole and the seventh vent hole are communicated with the propelling pipe joint, so that the sectional area of an exhaust channel of a cylinder cavity can be effectively increased, the exhaust rate can be increased, the resistance during piston movement can be reduced, and the running speed of the cylinder can be increased.

Description

Technical Field

[0001] The utility model relates to the technical field of using compressed gas as a power source, in particular to a pneumatic control system. Background Art

[0002] A cylinder is a pneumatic actuator that converts the pressure energy of compressed gas into mechanical energy in pneumatic transmission. In use, a common double-acting cylinder realizes the reciprocating linear motion of the piston rod by alternately supplying and exhausting air from both sides of the piston.

[0003] When the cylinder is in use, it is often necessary to cooperate with the air control valve to adjust the flow direction of the compressed gas. The pressure difference between the cavities on both sides of the piston is used to push the piston to move from one side to the other in the cavity. The two ends of the cylinder alternately intake and exhaust air to drive the reciprocating motion of the piston. The cylinder is subject to the air control valve and cylinder in the prior art. When the cylinder is working, the movement speed of the piston is affected by both the intake pressure and the exhaust resistance, especially the exhaust resistance, which makes the double-acting cylinder run slowly, becoming a bottleneck process in production, affecting the operation efficiency. Utility Model Content

[0004] The utility model aims to provide a pneumatic control system, which reduces the exhaust resistance of the cylinder and improves the running speed of the cylinder by adjusting and setting the cylinder and the air control valve.

[0005] In order to solve the above technical problems, the implementation method of the utility model provides a technical solution as follows:

[0006] A pneumatic control system includes a cylinder and an air control valve, one end of the cylinder is provided with a propulsion pipe joint, and the other end is provided with a reset pipe joint, the air control valve includes a valve body provided with a cavity, and a valve stem slidably mounted with the cavity, the valve body is provided with a first air vent, a second air vent, a third air vent, a fourth air vent, and a fifth air vent connected to the cavity, a sixth air vent corresponding to the second air vent is provided on the valve body along the radial direction of the cavity, and a seventh air vent corresponding to the fourth air vent is provided; the third air vent is connected to an air source, the second air vent and the sixth air vent are connected to the reset pipe joint, and the fourth air vent and the seventh air vent are connected to the propulsion pipe joint.

[0007] Furthermore, the reset pipe joint includes a first pipe joint and a second pipe joint, the first pipe joint is communicated with the sixth vent hole, and the second pipe joint is communicated with the second vent hole.

[0008] Furthermore, the propulsion pipe joint includes a third pipe joint and a fourth pipe joint, the third pipe joint is communicated with the seventh vent hole, and the fourth pipe joint is communicated with the fourth vent hole.

[0009] Furthermore, a sealing ring is provided between the valve stem and the cavity, and the sealing ring is axially arranged on both sides of the first vent hole, the second vent hole, the third vent hole, the fourth vent hole, and the fifth vent hole along the cavity.

[0010] Furthermore, a spacer ring is provided on the side of the sealing ring, and the spacer ring is used for axially limiting the sealing ring.

[0011] Furthermore, a first ventilation ring and a second ventilation ring are provided on the valve stem at intervals, and a distance between the first ventilation ring and the second ventilation ring is equal to a distance between the second ventilation hole and the fourth ventilation hole.

[0012] Furthermore, the first vent hole and the fifth vent hole are connected with a throttle valve.

[0013] Furthermore, the valve body is provided with a first bottom discharge port corresponding to the first vent hole along the radial direction of the cavity, and is provided with a second bottom discharge port corresponding to the fifth vent hole along the radial direction of the cavity.

[0014] Furthermore, fixing feet are provided on both sides of the valve body, and fixing holes for fasteners to pass through are provided on the fixing feet.

[0015] Furthermore, it comprises a foot switch, one end of the valve stem is provided with a rod head, and the rod head is hinged to the foot switch.

[0016] Compared with the prior art, the pneumatic control system provided by the utility model can effectively increase the cross-sectional area of ​​the exhaust channel of the cylinder cavity, increase the exhaust rate, reduce the resistance during piston movement, and improve the operating speed of the cylinder through the provision of two air holes connected to the cylinder propulsion pipe joint, namely the fourth air hole and the seventh air hole, and two air holes connected to the cylinder reset pipe joint, namely the second air hole and the sixth air hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0018] Figure 1 This is a schematic diagram of the overall structure of a pneumatic control system in one embodiment of the utility model;

[0019] Figure 2 It is a top view of the air control valve in one embodiment of the utility model;

[0020] Figure 3 It is a bottom view of the air control valve in one embodiment of the utility model;

[0021] Figure 4 It is a partial cross-sectional schematic diagram of the main view of the air control valve in one embodiment of the utility model;

[0022] Figure 5 It is a schematic diagram of the structure of the air control valve when the cylinder is not in motion in one embodiment of the utility model;

[0023] Figure 6 It is a schematic diagram of the structure of the air control valve when the piston rod is extended in one embodiment of the utility model;

[0024] Figure 7 This is a schematic diagram of the structure of the air control valve when the piston contracts in one embodiment of the utility model;

[0025] Figure 8 It is a schematic diagram of the connection structure between the air control valve and the foot switch in one embodiment of the utility model.

[0026] Explanation of the accompanying drawings: 1. cylinder; 2. piston rod; 3. reset pipe joint; 31. first pipe joint; 32. second pipe joint; 4. push pipe joint; 41. third pipe joint; 42. fourth pipe joint; 5. air control valve; 50. valve body; 51. first air vent; 52. second air vent; 53. third air vent; 54. fourth air vent; 55. fifth air vent; 56. sixth air vent; 57. seventh air vent; 58. first bottom outlet; 59. second bottom outlet; 510. fixing foot; 511. cavity; 512. valve cover; 513. spacer ring; 514. sealing ring; 6. valve stem; 61. first air ring; 62. second air ring; 63. rod head; 7. air pipe; 8. throttle valve; 9. foot switch. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the utility model clearer, the various embodiments of the utility model will be described in detail below with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the various embodiments of the utility model, many technical details are provided in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical schemes claimed for protection in the claims of the present application can be implemented.

[0028] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] like Figure 1-8A pneumatic control system includes a cylinder 1 and an air control valve 5, wherein one end of the cylinder 1 is provided with a propulsion pipe joint 4, and the other end is provided with a reset pipe joint 3, wherein the air control valve 5 includes a valve body 50 provided with a cavity 511, and a valve stem 6 slidably mounted with the cavity 511, wherein the valve body 50 is provided with a first vent hole 51, a second vent hole 52, a third vent hole 53, a fourth vent hole 54, and a fifth vent hole 55 in communication with the cavity 511, wherein the valve body 50 is provided with a sixth vent hole 56 corresponding to the second vent hole 52 in the radial direction of the cavity 511, and a seventh vent hole 57 corresponding to the fourth vent hole 54 in the radial direction of the cavity 511; wherein the third vent hole 53 is connected to an air source, wherein the second vent hole 52 and the sixth vent hole 56 are in communication with the reset pipe joint 3, and wherein the fourth vent hole 54 and the seventh vent hole 57 are in communication with the propulsion pipe joint 4.

[0030] like Figure 1 As shown, one embodiment of the utility model involves a pneumatic control system, including a cylinder 1, a piston cylinder is provided in the cylinder body of the cylinder 1, a piston is radially provided in the piston cylinder, the piston is sealed to the inner wall of the piston cylinder, and the piston can slide relative to the piston cylinder along its axial direction, a piston rod 2 is fixedly provided at one end of the piston, and the end of the piston rod 2 away from the piston extends out of the piston cylinder, and the piston cylinder is divided into a rod chamber and a rodless chamber by the piston, one side of the piston cylinder accommodating the piston rod 2 is a rod chamber, and the other side is a rodless chamber; a reset pipe joint 3 is provided in communication with the rod chamber, and the reset pipe joint 3 includes a first pipe joint 31 and a second pipe joint 32, and a propulsion pipe joint 4 is provided in communication with the rodless chamber, and the propulsion pipe joint 4 includes a third closing joint and a fourth pipe joint 42.

[0031] like Figure 2-4As shown, a pneumatic control system also includes an air control valve 5, which includes a valve body 50. The valve body 50 is provided with a cavity 511, and a valve stem 6 is slidingly and sealably penetrated in the cavity 511. A first ventilation ring 61 and a second ventilation ring 62 are provided on the valve stem 6 at intervals. The first ventilation ring 61 and the second ventilation ring 62 are annular grooves arranged on the valve stem 6. A plurality of ventilation holes are radially penetrated through the upper end of the valve body 50 and the cavity 511. The ventilation holes are sequentially arranged along the axial direction of the valve body 50 as the first ventilation hole 51, the second ventilation hole 52, the third ventilation hole 53, the fourth ventilation hole 54, and the fifth ventilation hole 55; a first bottom discharge port 58 is provided at the bottom of the valve body 50 in radial correspondence with the first ventilation hole 51 along the cavity 511, and a third bottom discharge port 58 is provided in radial correspondence with the fifth ventilation hole 55 along the cavity 511. Two bottom outlets 59, the first bottom outlet 58 and the second bottom outlet 59 are both connected to the cavity 511; a sixth air hole 56 is also provided on the side of the valve body 50 corresponding to the second air hole 52, the second air hole 52 and the sixth air hole 56 are on the same radial plane of the cavity 511, and a seventh air hole 57 is also provided corresponding to the fourth air hole 54, the fourth air hole 54 and the seventh air hole 57 are on the same radial plane of the cavity 511; preferably, the first air hole 51, the second air hole 52, the third air hole 53, the fourth air hole 54, and the fifth air hole 55 are spaced at the same distance, and the distance between the first air ring 61 and the second air ring 62 is equal to the distance between the second air hole 52 and the fourth air hole 54.

[0032] In one embodiment, the second air vent 52 is connected to the first pipe joint 31 through the air pipe 7, and the sixth air vent 56 is connected to the second pipe joint 32 through the air pipe 7. Of course, according to the convenience of use, the second air vent 52 can also be connected to the second pipe joint 32, and the sixth air vent 56 can be connected to the first pipe joint 31; the fourth air vent 54 is connected to the third pipe joint 41 through the air pipe 7, and the seventh air vent 57 is connected to the fourth pipe joint 42 through the air pipe 7. Of course, according to the convenience of use, the fourth air vent 54 can also be connected to the fourth pipe joint 42, and the seventh air vent 57 can be connected to the third pipe joint 41.

[0033] like Figure 5As shown, in one embodiment, a rod head 63 is provided at one end of the valve stem 6, a valve cover 512 is provided at one end of the valve body 50 facing the rod head 63, and a sealing ring 514 is further provided between the valve stem 6 and the cavity 511. The sealing ring 514 is radially arranged on both sides of the vent hole of the cavity 511, and the sealing ring 514 can seal the gap between the valve stem 6 and the cavity 511, and guide and isolate the flow of gas in the cavity 511. Preferably, a spacer ring 513 is abutted against the side of the sealing ring 514, and the spacer ring 513 is used for axial limitation of the sealing ring 514.

[0034] In one embodiment, a throttle valve 8 is provided on the first vent hole 51 and the fifth vent hole 55, and the throttle valve 8 is used to adjust the gas flow rate and silence the exhaust noise.

[0035] In one embodiment, in order to facilitate the fixed connection of the air control valve 5, fixing feet 510 are further provided on both sides of the valve body 50 of the air control valve 5. The fixing feet 510 are provided with fixing holes for fasteners to pass through. Preferably, the fixing feet 510 are integrally formed with the valve body 50.

[0036] like Figure 8 As shown, in one embodiment, one end of the valve stem 6 is provided with a rod head 63, and the rod head 63 can be connected to the foot switch 9 or the hand valve, and the valve stem 6 is driven to move by the foot switch 9 or the hand valve, thereby driving the first ventilation ring 61 and the second ventilation ring 62 to move, and the air path state is changed through the correspondence between the radial positions of the first ventilation ring 61 and the second ventilation ring 62 and the ventilation holes. Preferably, the rod head 63 is hingedly connected to the foot switch 9.

[0037] When in use, as shown in FIG. 5 , the third vent hole 53 is connected to an external air source, and the external air source inputs compressed gas into the cavity 511 through the third vent hole 53, and the valve stem 6 is moved so that the third vent hole 53 is radially offset from the first vent ring 61 and the second vent ring 62. Then, the sealing rings 514 on both sides of the third vent hole 53 seal the passage of the cavity 511, so that the gas passage in the cavity 511 is blocked, and the corresponding actuator, i.e., the cylinder 1, does not act;

[0038] As shown in Figure 6, move the valve stem 6 so that the second vent ring 62 corresponds to the third vent hole 53 and the fourth vent hole 54, that is, a passage is formed between the third vent hole 53 and the fourth vent hole 54, then the pressurized gas flows into the cavity 511 through the third vent hole 53, and flows to the cylinder 1 push pipe joint 4 through the fourth vent hole 54 and the seventh vent hole 57, and the compressed gas is injected into the rodless cavity. The gas pressure in the rodless cavity is greater than the gas pressure in the rod cavity. The pressure difference acts on the piston, pushing the piston to move, driving the piston rod 2 to extend, and the gas in the rod cavity is discharged to the air pipe 7 through the two reset pipe joints 3 at the same time, and then enters the cavity 511 from the second vent hole 52 and the sixth vent hole 56. Under the connecting action of the first vent ring 61, the gas is discharged from the cavity 511 from the first vent hole 51 and the first bottom discharge hole, forming a complete gas path. Through the two reset pipe joints 3, the coordinated arrangement with the second vent hole 52 and the fourth vent hole 54, the cross-sectional area of ​​the gas exhaust channel in the rod chamber is effectively increased, which is beneficial to reduce the resistance of the piston moving toward the rod chamber and can effectively increase the extension and propulsion speed of the piston rod 2.

[0039] As shown in Figure 7, move the valve stem 6 so that the first vent ring 61 corresponds to the second vent hole 52 and the third vent hole 53, that is, a passage is formed between the second vent hole 52 and the third vent hole 53, then the pressurized gas flows into the cavity 511 through the third vent hole 53, and flows to the cylinder 1 reset pipe joint 3 through the second vent hole 52 and the sixth vent hole 56, and the compressed gas is injected into the rod cavity. The gas pressure in the rod cavity is greater than the gas pressure in the rodless cavity. Under the action of the pressure difference, the piston is pushed to move, driving the piston rod 2 to contract and reset. The gas in the rodless cavity is discharged to the air pipe 7 through the two propulsion pipe joints 4 at the same time, and then enters the cavity 511 from the fourth vent hole 54 and the seventh vent hole 57. Under the connecting action of the second vent ring 62, the gas is discharged from the cavity 511 from the fifth exhaust hole and the second bottom exhaust hole, forming a complete gas path. By providing two propulsion pipe joints 4 and the fourth and seventh air holes 54 and 57 , the cross-sectional area of ​​the gas exhaust passage in the rodless cavity is increased, which is beneficial to reducing the resistance of the piston moving toward the rodless cavity and can effectively increase the contraction and reset movement speed of the piston rod 2 .

[0040] Compared with the prior art, the pneumatic control system provided by the utility model can effectively increase the cross-sectional area of ​​the exhaust channel of the cylinder cavity, increase the exhaust rate, reduce the resistance during piston movement, and improve the operating speed of the cylinder through the provision of two air holes connected to the cylinder propulsion pipe joint, namely the fourth air hole and the seventh air hole, and two air holes connected to the cylinder reset pipe joint, namely the second air hole and the sixth air hole.

[0041] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A pneumatic control system, characterized in that: The invention comprises a cylinder (1) and an air control valve (5), wherein one end of the cylinder (1) is provided with a propulsion pipe joint (4), and the other end is provided with a reset pipe joint (3), the air control valve (5) comprises a valve body (50) provided with a cavity (511), and a valve stem (6) slidably mounted with the cavity (511), and the valve body (50) is provided with a first air vent (51), a second air vent (52), a third air vent (53), a fourth air vent (54), a fifth air vent (55), and a second air vent (56). 55), a sixth air vent (56) corresponding to the second air vent (52), and a seventh air vent (57) corresponding to the fourth air vent (54) are arranged on the valve body (50) along the radial direction of the cavity (511); the third air vent (53) is connected to the air source, the second air vent (52) and the sixth air vent (56) are connected to the reset pipe joint (3), and the fourth air vent (54) and the seventh air vent (57) are connected to the propulsion pipe joint (4).

2. A pneumatic control system according to claim 1, characterized in that: The reset pipe joint (3) comprises a first pipe joint (31) and a second pipe joint (32); the first pipe joint (31) is in communication with the sixth vent hole (56); and the second pipe joint (32) is in communication with the second vent hole (52).

3. A pneumatic control system according to claim 1, characterized in that: The propulsion pipe joint (4) comprises a third pipe joint (41) and a fourth pipe joint (42), wherein the third pipe joint (41) is in communication with the seventh vent hole (57), and the fourth pipe joint (42) is in communication with the fourth vent hole (54).

4. A pneumatic control system according to claim 1, characterized in that: A sealing ring (514) is provided between the valve stem (6) and the cavity (511), and the sealing ring (514) is axially arranged on both sides of the first vent hole (51), the second vent hole (52), the third vent hole (53), the fourth vent hole (54), and the fifth vent hole (55) along the cavity (511).

5. A pneumatic control system according to claim 4, characterized in that: A spacer ring (513) is provided at the side of the sealing ring (514), and the spacer ring (513) is used for axially limiting the sealing ring (514).

6. A pneumatic control system according to claim 1, characterized in that: A first ventilation ring (61) and a second ventilation ring (62) are arranged on the valve stem (6) at intervals, and the distance between the first ventilation ring (61) and the second ventilation ring (62) is equal to the distance between the second ventilation hole (52) and the fourth ventilation hole (54).

7. A pneumatic control system according to claim 1, characterized in that: The first vent hole (51) and the fifth vent hole (55) are connected to a throttle valve (8).

8. A pneumatic control system according to claim 1, characterized in that: The valve body (50) and the first vent hole (51) are provided with a first bottom discharge port (58) corresponding to the radial direction of the cavity (511), and the valve body (50) and the fifth vent hole (55) are provided with a second bottom discharge port (59) corresponding to the radial direction of the cavity (511).

9. A pneumatic control system according to claim 1, characterized in that: Fixing feet (510) are provided on both sides of the valve body (50), and fixing holes for fasteners to pass through are provided on the fixing feet (510).

10. A pneumatic control system according to any one of claims 1 to 9, characterized in that: It comprises a foot switch (9), one end of the valve stem (6) is provided with a rod head (63), and the rod head (63) is hinged to the foot switch (9).

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