CN113586792A

CN113586792A - Three-section type double-shifting fork pneumatic actuator

Info

Publication number: CN113586792A
Application number: CN202110852427.4A
Authority: CN
Inventors: 蔡佳; 王利敏
Original assignee: Wuxi Force & Torque Technology Co ltd
Current assignee: Wuxi Force & Torque Technology Co ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2021-11-02
Anticipated expiration: 2041-07-27
Also published as: CN113586792B

Abstract

The invention relates to the technical field of pneumatic actuators, in particular to a three-section type double-shifting fork pneumatic actuator; the damping device comprises a limiting bolt, a box body, a third groove, a damping spring, a buffer block, a piston, an annular groove, an elastic rubber block and a through hole; when the box is inside when admitting air through gas pocket A, the inside atmospheric pressure of box increases, thereby make the piston move to the one end that is close to the cylinder cap, in-process when the piston motion, the cavity internal gas pressure between piston and the cylinder cap increases gradually, thereby make the gas in the cylinder body pass through in the through-hole gets into the ring channel, thereby make the atmospheric pressure in the ring channel increase, along with the piston continues the motion, atmospheric pressure in the ring channel continuously increases, make the elastic rubber piece in the ring channel expand, thereby make the elastic rubber piece extrude the cylinder body inner wall, thereby make the leakproofness of piston and cylinder body inner wall increase, thereby make the piston be applicable to the great executor of moment of torsion.

Description

Three-section type double-shifting fork pneumatic actuator

Technical Field

The invention relates to the technical field of pneumatic actuators, in particular to a three-section type double-shifting-fork pneumatic actuator.

Background

The traditional double-shifting fork type double-acting pneumatic actuator adopts an integrated cylinder body as a cylinder body part, and is relatively economical in material cost and assembly for the actuator with smaller output torque and less than 2000N.m, but is not an optimal choice in the aspects of material cost, whole machine assembly, maintenance and the like for the actuator with larger output torque and more than 2000 N.m.

Also appeared a patent among the prior art about a syllogic two shift fork pneumatic actuator's technical scheme, chinese patent as application number CN2017212413574 discloses a two shift fork two effect pneumatic actuator, including the cylinder, in the both ends sealing connection end cover of cylinder, the shift fork set up in the inside of cylinder the axle center of shift fork is passed through the spring pin and is connected the transmission shaft, follows a pair of open slot is seted up to the periphery of shift fork, in the one end butt that stretches into the cylinder through driving pin and piston in the open slot, the other end of piston and the one end butt of spacing bolt, the other end of spacing bolt stretch out the end cover and with nut threaded connection.

The above prior art is through setting up: the cylinder, the end cover, the shifting fork, the spring pin and the transmission shaft can reduce most parts, improve the transmission efficiency and save the production and assembly cost; but among the prior art to the flatness and the cylindricity of the section bar of present output torque at the executor cylinder body of about 2000N.m very difficult assurance, it is very high to the technological requirement, just so increased the cost of cylinder body, and prior art formula cylinder body as an organic whole, when the problem appearing, prior art is inconvenient complete machine assembly and later stage maintenance.

In view of this, the present invention provides a three-stage double-shift fork pneumatic actuator, which solves the above problems.

Disclosure of Invention

In order to make up for the defects of the prior art, the problems that in the prior art, the flatness and the cylindricity of the section bar of the actuator cylinder body with the output torque of about 2000N.m are difficult to ensure, the process requirement is very high, the cost of the cylinder body is increased, and in addition, the prior art is an integrated cylinder body, and when problems occur, the prior art is inconvenient for the whole machine assembly and the later maintenance; the invention provides a three-section type double-shifting fork pneumatic actuator.

The technical scheme adopted by the invention for solving the technical problems is as follows: a three-section type double-shifting fork pneumatic actuator comprises a box body, a cylinder body and a cylinder cover; the cylinder bodies are positioned on two sides of the box body, a cavity in the box body is communicated with a cavity in the cylinder body, and the cylinder covers are positioned at two ends of the cylinder bodies; the upper side of the box body is provided with an air hole A which is communicated with the interior of the box body, the lower side of the box body is provided with an air hole B which is communicated with the interior of the cylinder bodies at two sides through an air pipe, the interior of the box body is rotatably connected with a transmission shaft, the transmission shaft penetrates through the inner wall of the box body and is connected with an external valve, the interior of the box body is provided with a shifting fork, the middle part of the shifting fork is provided with a rectangular groove, the transmission shaft penetrates through the rectangular groove and is in close contact with the inner wall of the rectangular groove, two sides of the shifting fork are provided with a first groove in an up-and-down through manner, the first groove is connected with a bolt in a sliding manner, the upper end and the lower end of the bolt extend out of the first groove, pistons are connected with the interior of the cylinder bodies at two sides in a sliding manner, one end of each piston, which is close to the shifting fork, the middle parts of the upper end and the lower end of the transmission block are provided with a second groove, and two ends of the shifting fork are positioned in the second groove, the upper end and the lower end of a bolt in the first groove are rotatably connected into a groove on the inner wall of the second groove, one side of the box body is fixedly connected with two limiting bolts, one end of each limiting bolt penetrates through the inner wall of the box body and is positioned in the box body, the outer ring of the transmission shaft is fixedly connected with a cam, the outer ring of the cam is provided with two bulges, and the upper end of the box body and two sides of the cylinder body are fixedly connected with pressure release valves;

when the pneumatic actuator is used, the transmission shaft outside the pneumatic actuator is connected with the matched valve, the valve is switched on and off by the movement of the piston and the shifting fork in the pneumatic actuator, the air is ventilated into the box body through the air hole A, when the air enters the box body, the air pressure in the box body is increased, the air pressure in the box body is larger than the air pressure in the cylinder body, along with the continuous increase of the air pressure in the box body, the air in the box body pushes the piston to move towards the cylinder cover, when the piston moves, the piston drives the transmission block to move, the shifting fork is embedded into the second groove in the transmission block, the shifting fork is rotationally connected with the transmission block through the bolt in the first groove, when the piston moves, the piston drives the transmission block to move, the transmission block drives the shifting fork to rotate through the bolt, when the shifting fork rotates, the transmission shaft rotates, and when the transmission shaft rotates, the valve is switched on and switched off, when the transmission shaft rotates, the transmission shaft drives the cam to rotate, after the valve is opened and closed, the protrusion on the cam just impacts the limiting bolt to limit the cam, the transmission shaft stops rotating after the cam is limited, the piston stops moving, after the piston stops moving, the pressure relief valve on the box body relieves the pressure of the air pressure inside the box body, and after the air pressure inside the box body is relieved by the pressure relief valve, the air pressure inside the box body is still larger than the external air pressure; the air hole B is inflated, gas enters the cylinders at two ends through the vent pipe, so that the air pressure inside the cylinders is increased, after the air pressure inside the box body is relieved through the relief valve, the air pressure inside the cylinders is larger than the air pressure inside the box body, the gas pushes the piston to move towards the direction of the box body, when the piston moves, the piston drives the transmission block to move, the transmission block drives the bolt to move through rotating the bolt connected in the second groove, the bolt drives the shifting fork to move, when the valve switch is completed, the protrusion on the cam fixedly connected on the transmission shaft impacts the limiting bolt on the box body, so that the shifting fork stops moving, after the shifting fork stops moving, the relief valves at two ends of the cylinder body relieve the air pressure inside the cylinder body, and after the pressure inside the cylinder body is relieved, the air pressure inside the cylinder body is still larger than the external air pressure, therefore, when the piston moves left and right, the piston needs to overcome the air pressure difference, so that the piston is more stable when moving; and through the statement above, make this application can become the executor that output torque is big to reduced the requirement to the section bar, and divide into box and cylinder body through making pneumatic shift fork executor, compare with the pneumatic shift fork executor of integral type among the prior art, reduced the requirement to the section bar, be convenient for assembly and later stage maintenance have reduced manufacturing cost.

Preferably, three grooves are formed in one end, located inside the box body, of the limiting bolt, damping springs are fixedly connected into the three grooves, buffer blocks are connected into the three grooves in a sliding mode, and one ends, close to the damping springs, of the buffer blocks are fixedly connected with the damping springs;

during the use, evenly seted up No. three grooves through the one end that is located the box inside at spacing bolt, make No. three inslots link firmly damping spring, through sliding connection in No. three inslots there is the buffer block, make the buffer block be close to damping spring's one end and damping spring link firmly, when inside or the cylinder body inside ventilate, make the piston move, when the piston moves, the piston drives the transmission shaft through transmission block and shift fork and rotates, when the transmission shaft rotates, the transmission shaft drives the cam and rotates, when the cam extrudees spacing bolt, the cam contacts the buffer block earlier, the buffer block extrudees damping spring, damping spring cushions the buffer block, the buffer block cushions the cam, and then reduce the impact that the cam produced spacing bolt under big moment of torsion.

Preferably, the outer ring of the piston is provided with an annular groove, one end of the annular groove close to the inner wall of the cylinder body is fixedly connected with an elastic rubber block, the elastic rubber block seals the annular groove in the piston, one end of the piston close to the cylinder cover is provided with a through hole, and the through hole is communicated with the annular groove;

when the piston is used, the annular grooves are formed in the outer rings of the pistons, the elastic rubber block is fixedly connected to one end, close to the inner wall of the cylinder body, of the annular groove, the elastic rubber block is enabled to seal the annular groove in the piston, the through holes are evenly formed in one end, close to the cylinder cover, of the piston, the through holes are communicated with the annular groove, when air is fed into the box body through the air holes A, the air pressure in the box body is increased, so that the piston moves towards one end, close to the cylinder cover, in the moving process of the piston, the air pressure in a cavity between the piston and the cylinder cover is gradually increased, so that air in the cylinder body enters the annular groove through the through holes, the air pressure in the annular groove is increased, the air pressure in the annular groove is continuously increased along with the continuous movement of the piston, the elastic rubber block in the annular groove is expanded, the elastic rubber block is enabled to extrude the inner wall of the cylinder body, and the sealing performance between the piston and the inner wall of the cylinder body is increased, thereby making the piston suitable for use in actuators with higher torque.

Preferably, the through hole is conical, an opening at one end of the through hole close to the cylinder cover is large, and an opening at one end of the through hole far away from the cylinder cover is small;

during the use, the shape through making the through-hole sets up for the taper type, the opening that makes the cylinder body be close to the one end of cylinder cap is big, it is little to make the through-hole keep away from cylinder cap one end through-hole, when aerifing through gas pocket A inside the box, the inside atmospheric pressure of box increases, gaseous promotion piston moves to the direction of being close to the cylinder cap, when the piston moves, gas between piston and the cylinder cap gets into inside the ring channel through the through-hole, and when the through-hole is the taper type, when gaseous entering through-hole, according to the narrow tube effect principle, gaseous atmospheric pressure increases, gaseous velocity of flow increases, thereby make the gaseous efficiency that gets into in the ring channel increase.

Preferably, the outer rings of the convex parts of the cams are fixedly connected with air bags, the outer walls of the air bags are fixedly connected with hoses, one ends of the hoses are communicated with the air bags, and the other ends of the hoses penetrate through the ends, far away from the cylinder cover, of the pistons and are communicated with the annular groove;

when the pneumatic cylinder is used, the air bags are fixedly connected with the outer rings of the bulges of the cam, the outer wall of each air bag is fixedly connected with the hose, the hose is communicated with the air bags, the other ends of the hoses penetrate through one ends, far away from the cylinder cover, of the pistons to be communicated with the annular groove, the hoses do not influence the work of the actuator, when the inside of the box body is inflated through the air holes A, the air pressure inside the box body is increased, the air pushes the pistons to move towards one ends, close to the cylinder cover, when the pistons move, the air between the pistons and the cylinder cover enters the annular groove through the through holes, then the elastic rubber blocks in the annular groove are expanded, the air enters the inside of the air bags through the hoses, then the air bags are expanded, when the cam rotates, the expanded air bags impact force between the cam and the limiting bolts is buffered by the air bags, and therefore the impact force generated between the cam and the limiting bolts is further reduced, thereby being suitable for the pneumatic actuator with larger torque.

Preferably, the lower end of the buffer block is connected with a ball in a rolling manner, and when the cam rotates, the ball is contacted with the air bag;

during the use, there is the ball through the lower extreme roll connection at the buffer block, when the cam rotates, the ball contacts with the gasbag, when the shift fork rotates, the shift fork drives the transmission shaft and rotates, when the transmission shaft rotates, the transmission shaft drives the cam and rotates, and when the shift fork moves, the piston is moving simultaneously, when the piston moves, make inside gaseous entering gasbag through the hose, the gasbag expands, thereby when making the cam move, gasbag on the cam and the buffer block contact in the spacing bolt, thereby make the cam carry out spacing in-process, the gasbag produces the friction with the buffer block, through roll connection at buffer block lower extreme, the ball rotates when making gasbag and buffer block contact, thereby make the frictional force between buffer block and the gasbag reduce, thereby improve the life of spacing bolt and gasbag.

The invention has the following beneficial effects:

1. the invention relates to a three-section type double-shifting fork pneumatic actuator which is characterized in that a limiting bolt, a box body, a third groove, a damping spring and a buffer block are arranged; when box inside or cylinder body inside ventilates, make the piston move, when the piston moves, the piston drives the transmission shaft through transmission piece and shift fork and rotates, when the transmission shaft rotates, the transmission shaft drives the cam and rotates, when the cam extrudees spacing bolt, the cam contacts the buffer block earlier, the buffer block extrudees damping spring, damping spring cushions the buffer block, the buffer block cushions the cam, and then reduce the impact that the cam produced spacing bolt under big moment of torsion.

2. The invention relates to a three-section type double-shifting fork pneumatic actuator, which is characterized in that a piston, an annular groove, an elastic rubber block and a through hole are arranged; when the box is inside when admitting air through gas pocket A, the inside atmospheric pressure of box increases, thereby make the piston move to the one end that is close to the cylinder cap, in-process when the piston motion, the cavity internal gas pressure between piston and the cylinder cap increases gradually, thereby make the gas in the cylinder body pass through in the through-hole gets into the ring channel, thereby make the atmospheric pressure in the ring channel increase, along with the piston continues the motion, atmospheric pressure in the ring channel continuously increases, make the elastic rubber piece in the ring channel expand, thereby make the elastic rubber piece extrude the cylinder body inner wall, thereby make the leakproofness of piston and cylinder body inner wall increase, thereby make the piston be applicable to the great executor of moment of torsion.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;

FIG. 4 is a cross-sectional view taken at B-B of FIG. 2;

FIG. 5 is an enlarged view of a portion of FIG. 4 at C;

FIG. 6 is an enlarged view of a portion of FIG. 4 at D;

FIG. 7 is a structural view of the fork of FIG. 3;

FIG. 8 is a structural view of the piston of FIG. 3;

FIG. 9 is a structural view of the cylinder head of FIG. 3;

in the figure: the air-conditioning device comprises a box body 1, a cylinder body 11, a cylinder cover 12, an air pipe 13, a transmission shaft 14, a shifting fork 15, a rectangular groove 151, a first groove 152, a bolt 153, a limit bolt 16, a third groove 161, a damping spring 162, a buffer block 163, a cam 17, an air bag 171, a hose 172, a ball 173, a pressure release valve 18, a piston 2, a transmission block 21, a second groove 22, an annular groove 23, an elastic rubber block 24 and a through hole 25.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 9, a three-section type double-shifting fork 15 pneumatic actuator comprises a box body 1, a cylinder body 11 and a cylinder cover 12; the cylinder bodies 11 are positioned at two sides of the box body 1, a cavity in the box body 1 is communicated with a cavity in the cylinder bodies 11, and the cylinder covers 12 are positioned at two ends of the cylinder bodies 11; the upper side of the box body 1 is provided with an air hole A which is communicated with the inside of the box body 1, the lower side of the box body 1 is provided with an air hole B, the air hole B is communicated with the insides of the cylinder bodies 11 at two sides through an air pipe 13, the inside of the box body 1 is rotatably connected with a transmission shaft 14, the transmission shaft 14 penetrates through the inner wall of the box body 1 and is connected with an external valve, a shifting fork 15 is arranged inside the box body 1, the middle part of the shifting fork 15 is provided with a rectangular groove 151, the transmission shaft 14 penetrates through the rectangular groove 151 and is in close contact with the inner wall of the rectangular groove 151, the two sides of the shifting fork 15 are vertically communicated with a first groove 152, a bolt 153 is connected in the first groove 152 in a sliding manner, the upper end and the lower end of the bolt 153 extend out of the first groove 152, the insides of the cylinder bodies 11 at two sides are connected with pistons 2 in a sliding manner, one end, which is close to the shifting fork 15, a transmission block 21 is fixedly connected with a second groove 22 at the middle part of the upper end and the lower end of the transmission block 21, two ends of the shifting fork 15 are positioned in the second groove 22, the upper end and the lower end of the bolt 153 in the first groove 152 are rotatably connected in grooves on the inner wall of the second groove 22, one side of the box body 1 is fixedly connected with two limiting bolts 16, one end of each limiting bolt 16 penetrates through the inner wall of the box body 1 and is positioned in the box body 1, the outer ring of the transmission shaft 14 is fixedly connected with a cam 17, two bulges are arranged on the outer ring of the cam 17, and the upper end of the box body 1 and two sides of the cylinder body 11 are fixedly connected with pressure release valves 18;

when the pneumatic actuator is used, the transmission shaft 14 outside the pneumatic actuator is connected with the matched valve, the valve is switched by the movement of the piston 2 and the shifting fork 15 in the pneumatic actuator, the air is introduced into the box body 1 through the air hole A, when the air enters the box body 1, the air pressure in the box body 1 is increased, the air pressure in the box body 1 is greater than the air pressure in the cylinder body 11, along with the continuous increase of the air pressure in the box body 1, the air in the box body 1 pushes the piston 2 to move towards the cylinder cover 12, when the piston 2 moves, the piston 2 drives the transmission block 21 to move, the shifting fork 15 is embedded into the second groove 22 in the transmission block 21, the shifting fork 15 is rotatably connected with the transmission block 21 through the pin 153 in the first groove 152, when the piston 2 moves, the piston 2 drives the transmission block 21 to move, the transmission block 21 drives the shifting fork 15 to rotate through the pin 153, the shifting fork 15 drives the transmission shaft 14 to rotate when rotating, the opening and closing of a valve are realized when the transmission shaft 14 rotates, the transmission shaft 14 drives the cam 17 to rotate when the transmission shaft 14 rotates, after the valve opening and closing are completed, a bulge on the cam 17 just impacts the limiting bolt 16, the limiting bolt 16 limits the cam 17, the transmission shaft 14 stops rotating after the cam 17 is limited, the piston 2 stops moving, after the piston 2 stops moving, the pressure relief valve 18 on the box body 1 relieves the pressure of the air inside the box body 1, and after the air pressure inside the box body 1 is relieved through the pressure relief valve 18, the air pressure inside the box body 1 is still larger than the external air pressure; the air hole B is inflated, air enters the cylinder bodies 11 at two ends through the air pipe 13, so that the air pressure inside the cylinder bodies 11 is increased, after the air pressure inside the box body 1 is relieved through the relief valve 18, the air pressure inside the cylinder body 11 is larger than the air pressure inside the box body 1, so that the air pushes the piston 2 to move towards the direction of the box body 1, when the piston 2 moves, the piston 2 drives the transmission block 21 to move, the transmission block 21 drives the bolt 153 to move by rotating the bolt 153 connected in the second groove 22, the bolt 153 drives the shifting fork 15 to move, when a valve switch is completed, a protrusion on the cam 17 fixedly connected on the transmission shaft 14 impacts the limiting bolt 16 on the box body 1, so that the shifting fork 15 stops moving, after the shifting fork 15 stops moving, the relief valves 18 at two ends of the cylinder body 11 relieve the air pressure inside the cylinder body 11, after the pressure in the cylinder 11 is relieved, the air pressure in the cylinder 11 is still greater than the external air pressure, so that when the piston 2 moves left and right, the piston 2 needs to overcome the air pressure difference, and the piston 2 is more stable when moving; and through the statement above, make this application can become the executor that output torque is big to reduced the requirement to the section bar, and divide into box 1 and cylinder body 11 through making pneumatic shift fork 15 executor, compare with the pneumatic shift fork 15 executor of integral type among the prior art, reduced the requirement to the section bar, be convenient for assembly and later stage maintenance have reduced manufacturing cost.

As a specific embodiment of the invention, a third groove 161 is formed at one end of the limit bolt 16 located inside the box body 1, a damping spring 162 is fixedly connected inside the third groove 161, a buffer block 163 is slidably connected inside the third groove 161, and one end of the buffer block 163 close to the damping spring 162 is fixedly connected with the damping spring 162;

when in use, the third groove 161 is uniformly arranged at one end of the limit bolt 16 positioned in the box body 1, so that the third groove 161 is fixedly connected with the damping spring 162, by slidably connecting the buffer block 163 in the third groove 161, one end of the buffer block 163 close to the damping spring 162 is fixedly connected with the damping spring 162, when the inside of the box body 1 or the inside of the cylinder body 11 is ventilated, the piston 2 is moved, when the piston 2 moves, the piston 2 drives the transmission shaft 14 to rotate through the transmission block 21 and the shifting fork 15, when the transmission shaft 14 rotates, the transmission shaft 14 drives the cam 17 to rotate, when the cam 17 extrudes the limit bolt 16, the cam 17 contacts the buffer block 163 first, the buffer block 163 extrudes the damping spring 162, the damping spring 162 cushions the buffer block 163, and the buffer block 163 cushions the cam 17, so that the impact force generated by the cam 17 on the limit bolt 16 under large torque is reduced.

As a specific embodiment of the invention, the outer rings of the pistons 2 are all provided with annular grooves 23, one ends of the annular grooves 23 close to the inner wall of the cylinder body 11 are fixedly connected with elastic rubber blocks 24, the elastic rubber blocks 24 seal the annular grooves 23 in the pistons 2, one ends of the pistons 2 close to the cylinder cover 12 are all provided with through holes 25, and the through holes 25 are communicated with the annular grooves 23;

when in use, the annular grooves 23 are formed in the outer rings of the pistons 2, the elastic rubber blocks 24 are fixedly connected to one ends of the annular grooves 23 close to the inner wall of the cylinder body 11, the elastic rubber blocks 24 seal the annular grooves 23 in the pistons 2, the through holes 25 are uniformly formed in the ends of the pistons 2 close to the cylinder cover 12, the through holes 25 are communicated with the annular grooves 23, when air is fed into the box body 1 through the air holes A, the air pressure in the box body 1 is increased, so that the pistons 2 move towards one ends close to the cylinder cover 12, the air pressure in a cavity between the pistons 2 and the cylinder cover 12 is gradually increased in the moving process of the pistons 2, so that the air in the cylinders 11 enters the annular grooves 23 through the through holes 25, the air pressure in the annular grooves 23 is increased, the air pressure in the annular grooves 23 is continuously increased along with the continuous movement of the pistons 2, and the elastic rubber blocks 24 in the annular grooves 23 are expanded, thereby, the elastic rubber block 24 presses the inner wall of the cylinder 11, so that the sealing performance between the piston 2 and the inner wall of the cylinder 11 is increased, and the piston 2 is suitable for an actuator with larger torque.

As a specific embodiment of the present invention, the through hole 25 is in a conical shape, an opening of the through hole 25 near the cylinder head 12 is large, and an opening of the through hole 25 far from the cylinder head 12 is small;

during the use, set up for the taper type through the shape that makes through-hole 25, the opening that makes cylinder body 11 be close to the one end of cylinder cap 12 is big, it is little to make through-hole 25 keep away from cylinder cap 12 one end through-hole 25, when box 1 is inside aerifys through gas pocket A, the inside atmospheric pressure of box 1 increases, gaseous promotion piston 2 is to the direction that is close to cylinder cap 12 and is moved, when piston 2 moves, the gas between piston 2 and the cylinder cap 12 gets into annular groove 23 inside through-hole 25, and when through-hole 25 is the taper type, when gaseous entering through-hole 25, according to the throat effect principle, gaseous atmospheric pressure increases, gaseous velocity of flow increases, thereby make the gaseous efficiency that gets into in the annular groove 23 increase.

As a specific embodiment of the invention, the outer rings of the protrusions of the cam 17 are fixedly connected with an air bag 171, the outer wall of the air bag 171 is fixedly connected with a hose 172, one end of the hose 172 is communicated with the air bag 171, and the other end of the hose 172 penetrates through one end of the piston 2 far away from the cylinder cover 12 to be communicated with the annular groove 23;

when the air bag type air-conditioner is used, the air bags 171 are fixedly connected to the outer rings of the bulges of the cam 17, the hose 172 is fixedly connected to the outer wall of the air bag 171, the hose 172 is communicated with the air bag 171, the other end of the hose 172 penetrates through one end, far away from the cylinder cover 12, of the piston 2 to be communicated with the annular groove 23, the hose 172 does not influence the work of an actuator, when air is fed into the box body 1 through the air hole A, the air pressure in the box body 1 is increased, the air pushes the piston 2 to move towards one end, close to the cylinder cover 12, when the piston 2 moves, the air between the piston 2 and the cylinder cover 12 enters the annular groove 23 through the through hole 25, then the elastic rubber block 24 in the annular groove 23 is expanded, the air enters the air bag 171 through the hose 172 and then the air bag 171 is expanded, then when the cam 17 rotates, the expanded air bag 171 on the cam 17 impacts the limit bolt 16, and the air bag 171 buffers the force generated between the cam 17 and the limit bolt 16, thereby further reducing the impact force generated between the cam 17 and the limit bolt 16, and thus being suitable for a pneumatic actuator with a larger torque.

In an embodiment of the present invention, a ball 173 is connected to a lower end of the buffer block 163 in a rolling manner, and when the cam 17 rotates, the ball 173 contacts the air bag 171;

when the air bag type air bag stopping device is used, the ball 173 is connected to the lower end of the buffer block 163 in a rolling mode, when the cam 17 rotates, the ball 173 is in contact with the air bag 171, when the shifting fork 15 rotates, the shifting fork 15 drives the transmission shaft 14 to rotate, when the transmission shaft 14 rotates, the cam 17 is driven to rotate, when the shifting fork 15 moves, the piston 2 moves simultaneously, when the piston 2 moves, air enters the air bag 171 through the hose 172, the air bag 171 expands, so that when the cam 17 moves, the air bag 171 on the cam 17 is in contact with the buffer block 163 in the limiting bolt 16, so that the air bag 171 and the buffer block 163 generate friction in the limiting process of the cam 17, and the ball 173 is connected to the lower end of the buffer block 163 in a rolling mode, so that when the air bag is in contact with the buffer block, the ball rotates, and the friction force between the buffer block 163 and the air bag 171 is reduced, thereby improving the service life of the limit bolt 16 and the air bag 171.

The specific working process is as follows:

the transmission shaft 14 outside the pneumatic actuator is connected with the matched valve, the valve is switched by the movement of the piston 2 and the shifting fork 15 in the pneumatic actuator, the air is ventilated into the box body 1 through the air hole A, when the air enters the box body 1, the air pressure in the box body 1 is increased, the air pressure in the box body 1 is larger than the air pressure in the cylinder body 11, along with the continuous increase of the air pressure in the box body 1, the air in the box body 1 pushes the piston 2 to move towards the cylinder cover 12, when the piston 2 moves, the piston 2 drives the transmission block 21 to move, the shifting fork 15 is embedded into the second groove 22 in the transmission block 21, the shifting fork 15 is rotatably connected with the transmission block 21 through the pin 153 in the first groove 152, when the piston 2 moves, the piston 2 drives the transmission block 21 to move, the transmission block 21 drives the shifting fork 15 to rotate through the pin 153, and when the shifting fork 15 rotates, the transmission shaft 14 is driven to rotate, when the transmission shaft 14 rotates, the valve is opened and closed, and when the transmission shaft 14 rotates, the transmission shaft 14 drives the cam 17 to rotate, after the valve is opened and closed, the protrusion on the cam 17 just impacts the limiting bolt 16, so that the limiting bolt 16 limits the cam 17, the transmission shaft 14 stops rotating after the cam 17 is limited, the piston 2 stops moving, after the piston 2 stops moving, the pressure relief valve 18 on the box body 1 relieves the pressure of the air pressure inside the box body 1, and after the air pressure inside the box body 1 is relieved through the pressure relief valve 18, the air pressure inside the box body 1 is still larger than the external air pressure; the air hole B is inflated, air enters the cylinder bodies 11 at two ends through the air pipe 13, so that the air pressure inside the cylinder bodies 11 is increased, after the air pressure inside the box body 1 is relieved through the relief valve 18, the air pressure inside the cylinder body 11 is larger than the air pressure inside the box body 1, so that the air pushes the piston 2 to move towards the direction of the box body 1, when the piston 2 moves, the piston 2 drives the transmission block 21 to move, the transmission block 21 drives the bolt 153 to move by rotating the bolt 153 connected in the second groove 22, the bolt 153 drives the shifting fork 15 to move, when a valve switch is completed, a protrusion on the cam 17 fixedly connected on the transmission shaft 14 impacts the limiting bolt 16 on the box body 1, so that the shifting fork 15 stops moving, after the shifting fork 15 stops moving, the relief valves 18 at two ends of the cylinder body 11 relieve the air pressure inside the cylinder body 11, and when the pressure in the cylinder 11 is released, the air pressure in the cylinder 11 is still greater than the external air pressure.

The front, the back, the left, the right, the upper and the lower are all based on figure 1 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and the like.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.

Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of protection of the present invention.

Claims

1. The utility model provides a two shift fork pneumatic actuator of syllogic which characterized in that: comprises a box body (1), a cylinder body (11) and a cylinder cover (12); the cylinder body (11) is positioned at two sides of the box body (1), a cavity in the box body (1) is communicated with a cavity in the cylinder body (11), and the cylinder covers (12) are positioned at two ends of the cylinder body (11); the gas hole A is arranged on the upper side of the box body (1), the gas hole A is communicated with the interior of the box body (1), the gas hole B is arranged on the lower side of the box body (1), the gas hole B is communicated with the interior of the cylinder bodies (11) on two sides through a vent pipe (13), a transmission shaft (14) is rotatably connected to the interior of the box body (1), the transmission shaft (14) penetrates through the inner wall of the box body (1) and is connected with an external valve, a shifting fork (15) is arranged in the box body (1), a rectangular groove (151) is formed in the middle of the shifting fork (15), the transmission shaft (14) penetrates through the rectangular groove (151) and is in close contact with the inner wall of the rectangular groove (151), a first groove (152) is formed in the two sides of the shifting fork (15) in a penetrating manner, a bolt (153) is slidably connected to the first groove (152), a first groove (152) is extended from the upper end to the lower end of the bolt (153), a piston (2) is slidably connected to the interior of two sides of the cylinder body (11), every piston (2) are close to the one end of shift fork (15) and have all linked firmly transmission piece (21), No. two grooves (22) have been seted up at both ends middle part about transmission piece (21), shift fork (15) both ends are located the recess on No. two grooves (22) inner wall, and the upper and lower both ends of bolt (153) in groove (152) rotate to be connected in No. two grooves (22), box (1) one side has linked firmly two stop bolt (16), stop bolt (16) one end is passed box (1) inner wall and is located inside box (1), transmission shaft (14) outer lane links firmly cam (17), cam (17) outer lane has two archs, box (1) upper end and cylinder body (11) both sides have all linked firmly relief valve (18).

2. The three-section double-shift-fork pneumatic actuator according to claim 1, wherein: no. three grooves (161) have all been seted up to the one end that stop bolt (16) are located box (1) inside, damping spring (162) have been linked firmly in No. three grooves (161), No. three groove (161) sliding connection has buffer block (163), buffer block (163) are close to damping spring (162) one end and damping spring (162) link firmly.

3. The three-section double-shift-fork pneumatic actuator according to claim 2, wherein: annular groove (23) have all been seted up to the outer lane of piston (2), the one end that annular groove (23) are close to cylinder body (11) inner wall has linked firmly elastic rubber piece (24), elastic rubber piece (24) are sealed to annular groove (23) realization in piston (2), through-hole (25) have all been seted up to the one end that piston (2) are close to cylinder cap (12), through-hole (25) and annular groove (23) intercommunication.

4. A three-section double-shift fork pneumatic actuator according to claim 3, wherein: the shape of through-hole (25) is the tapered, the one end opening that through-hole (25) are close to cylinder cap (12) is big, the one end opening that through-hole (25) kept away from cylinder cap (12) is little.

5. The three-section double-shift-fork pneumatic actuator according to claim 4, wherein: protruding department outer lane of cam (17) all has linked firmly gasbag (171), gasbag (171) outer wall has linked firmly hose (172), hose (172) one end and gasbag (171) intercommunication, hose (172) other end passes piston (2) and keeps away from the one end and the ring channel (23) intercommunication of cylinder cap (12).

6. The three-section double-shift-fork pneumatic actuator according to claim 5, wherein: the lower end of the buffer block (163) is connected with a ball (173) in a rolling way, and when the cam (17) rotates, the ball (173) is contacted with the air bag (171).