CN113187776A

CN113187776A - Variable stroke cylinder

Info

Publication number: CN113187776A
Application number: CN202110576214.3A
Authority: CN
Inventors: 舒春辉; 程岳龙
Original assignee: Ningbo Xinchao Automatization Component Co ltd
Current assignee: Ningbo Xinchao Automatization Component Co ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-07-30
Anticipated expiration: 2041-05-26
Also published as: CN113187776B

Abstract

The invention belongs to the technical field of double-acting cylinders, and particularly relates to a variable-stroke cylinder which comprises a cylinder barrel and end covers fixedly arranged at two ends of the cylinder barrel, wherein electromagnetic valves for controlling the on-off of a gas path are arranged outside the end covers, a telescopic movable piston column is arranged inside the cylinder barrel, a guide column for guiding the movement direction of the piston column is fixedly arranged inside the cylinder barrel, and the piston column is sleeved on the outer wall of the guide column in a sliding manner; through setting up novel cylinder body and with cylinder body complex piston post, the inside setting of cylinder body is used for the guide post of piston post direction, sets up the stop gear to piston post stroke restriction on the guide post, and the end portion of piston post sets up the adjustment mechanism who is used for adjusting the stroke size, and stop gear and adjustment mechanism mutually support, can reach the stroke size of controlling the piston post to change the effective working stroke of cylinder, can adapt to different product transport distance's demand.

Description

Variable stroke cylinder

Technical Field

The invention belongs to the technical field of double-acting cylinders, and particularly relates to a variable stroke cylinder.

Background

The common double-acting cylinder is composed of cylinder barrel, front and back cylinder covers, piston rod, sealing part and fastening part, and is characterized by that between the cylinder barrel and front and back cylinder covers it is fastened and locked by four pull rods and nuts, and the interior of the cylinder is equipped with piston connected with piston rod, and the piston is equipped with piston sealing ring.

The existing air cylinder is widely applied to industrial automation because of excellent performance, compared with an electric actuator, the air cylinder can reliably work under severe conditions, is simple to operate and basically can realize maintenance-free, is good at reciprocating linear motion, is particularly suitable for linear conveying of workpieces which are the most transmission requirements in industrial automation, but also lacks the advantages of high response speed and stable conveying torque of the electric actuator, and in the automatic production process, products of different batches need to execute linear conveying distances of different lengths, so the conveying stroke of the actuator is adjusted, the air cylinder can only reciprocate in a determined stroke and does not have adjusting capacity, the requirements on the conveying distances of different products can only be realized by replacing air cylinders of different strokes, and is relatively troublesome, therefore, in the application of industrial automation production, there are certain disadvantages.

Disclosure of Invention

The present invention provides a variable stroke cylinder to solve the problems set forth in the background art described above.

In order to achieve the purpose, the invention provides the following technical scheme: a variable stroke cylinder comprises a cylinder barrel and end covers fixedly arranged at two ends of the cylinder barrel, wherein an electromagnetic valve used for controlling the on-off of an air path is arranged outside each end cover, a telescopic movable piston post is arranged inside the cylinder barrel, a guide post used for guiding the movement direction of the piston post is fixedly arranged inside the cylinder barrel, the piston post is sleeved on the outer wall of the guide post in a sliding manner, a guide sleeve matched with the piston post is fixedly arranged on each end cover, a first air cavity used for pushing the piston post to extend out is formed between the piston post and the guide post, a second air cavity used for pushing the piston post to contract is formed between the piston post and the cylinder barrel, a limiting mechanism used for limiting the stroke of the piston post is arranged at the end part of the guide post, and a limiting retaining ring matched with the limiting mechanism is fixedly arranged in the middle section inside of the piston post, and an adjusting mechanism for adjusting the stroke is arranged at the end head part of the piston column.

Preferably, the end cover comprises a rear end cover and a front end cover which are arranged at two ends of the cylinder barrel and used for sealing the cylinder barrel, the guide post is fixed on the rear end cover, a first lubricating ring sleeve and a second lubricating ring sleeve which are used for maintaining the stable axial motion state of the piston post are fixedly arranged on the inner side wall and the outer side wall of one end, close to the rear end cover, of the piston post respectively, the first lubricating ring sleeve and the second lubricating ring sleeve are attached to and slide on the outer side wall of the guide post and the inner side wall of the cylinder barrel respectively, a first air inlet channel communicated with the electromagnetic valve, the guide post and the first air cavity is arranged on the rear end cover, and a second air inlet channel communicated with the electromagnetic valve and the second air cavity is arranged on the front end cover.

Preferably, stop gear installs including rotating the lead screw and the cover of guide post tip are established the outside stopper of lead screw, the stopper with lead screw thread fit for adjusting the stopper is in position on the lead screw, spacing retaining ring activity is in between stopper and the guide post, the inside of piston post is equipped with and is used for holding stopper and adjustment mechanism's activity chamber, pass through between first chamber and the activity chamber spacing retaining ring separates, set up on the lateral wall of piston post with the pressure release hole that the activity chamber switched on, second lubrication ring cover with interval between the spacing retaining ring is greater than the length of lead screw.

Preferably, an air guide channel used for communicating the first air inlet duct and the first air cavity is formed in the guide column, a screw rod mounting seat used for positioning the axial position of the screw rod and freely sliding in the circumferential direction is arranged on the guide column, and a second bearing is fixedly arranged between the screw rod and the screw rod mounting seat.

Preferably, a fixing frame used for supporting the lead screw mounting seat to be stable and conducting the air guide channel is arranged between the lead screw mounting seat and the inner side wall of the guide post, and an air hole used for communicating the air guide channel and the first air cavity is formed between the fixing frame and the guide post and between the fixing frame and the lead screw mounting seat.

Preferably, the adjusting mechanism comprises a knurling shaft, a knob cap and a positioning cap, one end of the knurling shaft is fixedly connected with the knob cap in running fit with the piston column, a knurling groove matched with the knurling shaft is formed in the screw rod, and the other end of the knurling shaft is located in the movable cavity and extends into the knurling groove, so that the screw rod and the knurling shaft are circumferentially fixed and can axially slide.

Preferably, the end part of the piston column corresponds to the knob cap and is provided with a positioning clamping groove, a positioning cap used for limiting the circumferential direction of the knob cap is installed in the positioning clamping groove in a clamping mode, a meshing gear ring matched with the positioning clamping groove in a clamping mode is arranged on the circumferential side wall of the positioning cap, and a jaw groove is formed in the outer side wall of the positioning cap.

Preferably, graphite copper sleeves used for lubrication are fixedly arranged on contact surfaces of the second lubricating ring sleeve and the cylinder barrel and contact surfaces of the first lubricating ring sleeve and the guide post, air gaps are formed among the piston post, the first lubricating ring sleeve and the guide post, the air gaps are formed among the second lubricating ring sleeve and the cylinder barrel, transition air cavities are formed among the first air cavity and the second air cavity, and the first air cavity, the second air cavity and the transition air cavities are communicated through the air gaps.

Preferably, the limiting retainer ring is provided with a transmission ring at the joint of the screw rod, the transmission ring is sleeved outside the screw rod, the transmission ring is matched with the screw rod in a transmission manner, a first bearing is fixedly arranged between the transmission ring and the limiting retainer ring, the transmission ring is connected with the limiting retainer ring through the first bearing in a rotating manner, buffer rings are arranged on two sides of the limiting retainer ring, and the buffer rings are attached and fixed on two sides of the limiting retainer ring.

Preferably, be equipped with on the inside wall in activity chamber right the spacing guide rail of stopper circumference, the guide rail with piston post fixed connection, seted up on the circumference lateral wall of stopper with guide rail complex guide way, the stopper with guide rail sliding connection.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the novel cylinder body and the piston column matched with the cylinder body are arranged, the guide column for guiding the piston column is arranged in the cylinder body, the limiting mechanism for limiting the stroke of the piston column is arranged on the guide column, the end part of the piston column is provided with the adjusting mechanism for adjusting the stroke, and the limiting mechanism and the adjusting mechanism are matched with each other, so that the stroke of the piston column can be controlled, the effective working stroke of the cylinder is changed, and the requirements of different product conveying distances can be met.

2. Through the volume of compression cylinder to set up novel piston post and separate the multistage with the air cavity, make the air cavity of forward action separate with the air cavity of reverse action, the air cavity volume of direct action piston post reduces, the area of action to the piston reduces, under the same atmospheric pressure effect, the pressure that the piston post received is bigger, the action is more sensitive, quick, the stroke process that makes whole piston post has faster response speed, bigger output dynamics and last stable power take off for current cylinder structure.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic cross-sectional view of a piston rod in a contracted state according to the present invention;

FIG. 2 is a schematic sectional view of the piston post of the present invention in an extended state;

FIG. 3 is a schematic view of the structure of the guide post, screw and knurled shaft of the present invention;

FIG. 4 is an enlarged schematic view of portion B of FIG. 2;

FIG. 5 is a schematic cross-sectional view taken along line C-C of FIG. 4;

FIG. 6 is a schematic sectional view taken along line A-A in FIG. 3;

FIG. 7 is a schematic view of the piston post head and the retaining cap of the present invention;

fig. 8 is an enlarged schematic view of a portion D in fig. 2.

In the figure: 1. an end cap; 101. a first air intake duct; 102. a second air intake duct; 11. a rear end cap; 12. a front end cover; 2. a cylinder barrel; 3. a guide sleeve; 4. a guide post; 401. an air guide channel; 402. air holes; 41. a screw rod mounting seat; 42. a fixed mount; 5. a piston post; 501. a first air cavity; 502. a second air cavity; 503. a transition air cavity; 504. an air gap; 505. a movable cavity; 506. positioning the clamping groove; 507. a pressure relief vent; 51. a first lubrication ring sleeve; 52. a second lubrication ring sleeve; 53. a limit retainer ring; 54. a guide rail; 55. a graphite copper sleeve; 56. a first bearing; 57. a buffer ring; 58. a drive ring; 6. a screw rod; 61. a second bearing; 601. a knurling groove; 7. a limiting block; 71. a guide groove; 8. an adjustment mechanism; 81. a knurling shaft; 82. a knob cap; 83. a positioning cap; 831. meshing the gear ring; 832. a jaw groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, the present invention provides the following technical solutions: a variable stroke cylinder comprises a cylinder barrel 2 and end covers 1 fixedly arranged at two ends of the cylinder barrel 2, an electromagnetic valve for controlling the on-off of an air path is arranged outside the end covers 1, a telescopic movable piston post 5 is arranged inside the cylinder barrel 2, a guide post 4 for guiding the movement direction of the piston post 5 is fixedly arranged inside the cylinder barrel 2, the piston post 5 is slidably sleeved on the outer wall of the guide post 4, a guide sleeve 3 matched with the piston post 5 is fixedly arranged on the end cover 1, the end part of the piston post 5 penetrates through the cylinder barrel 2 to the outside of the end cover 1, the guide sleeve 3 is fixedly arranged on the end cover 1 penetrated by the piston post 5, the guide post 4 distributed in parallel with the cylinder barrel 2 is arranged at the middle position inside the cylinder barrel 2, the piston post 5 slides on the outer surface wall of the guide post 4 along the length direction of the guide post 4, the guide post 4 arranged inside the cylinder barrel 2 provides a guide effect for the movement direction of the piston post 5, the inner part and the outer part of the piston column 5 respectively form a chamber for pushing the piston column 5 towards two opposite directions, the volume of the chamber is smaller than that of the existing cylinder, under the same air pressure, the piston column 5 is subjected to higher pressure, and the action is more sensitive and faster;

a first air cavity 501 for pushing the piston column 5 to extend out is formed between the piston column 5 and the guide column 4, a second air cavity 502 for pushing the piston column 5 to contract is formed between the piston column 5 and the cylinder barrel 2, the first air cavity 501 is formed between the piston column 5 and the guide column 4, a first air inlet channel 101 communicated with the electromagnetic valve is arranged on the rear end cover 11, the first air inlet channel 101 is communicated with the first air cavity 501 through the guide column 4, a second air cavity 502 is formed between the piston column 5, the second lubricating ring sleeve 52, the cylinder barrel 2 and the front end cover 12, a second air inlet channel 102 communicated with the electromagnetic valve is arranged on the front end cover 12, the second air inlet channel 102 is communicated with the second air cavity 502, the first air cavity 501 between the piston column 5 and the guide column 4 is formed by inflating the first air inlet channel 101 to the piston column 5 through the guide column 4, the piston column 5 can be driven to extend out of the cylinder barrel 2, and the air entering from the first air inlet channel 101 is guided by the guide column 4, the air is directly blown to the limit retainer ring 53 in the piston column 5, the air rapidly rushes into the first air cavity 501 with a small space in a short time, the acting section is small, the pressure is relatively large, the piston column 5 can be extruded to rapidly move, the starting speed of the piston column 5 is improved, the piston column 5, the second lubricating ring sleeve 52, the second air cavity 502 formed between the cylinder barrel 2 and the front end cover 12 is formed by inflating the second air inlet channel 102 to the direction of the second lubricating ring sleeve 52, the piston rod 5 can be driven to contract into the cylinder barrel 2, the second air cavity 502 is in a hollow cylinder shape, after the second air inlet channel 102 rushes into the second air cavity 502, the acting surface on the second lubricating ring sleeve 52 is a circular ring, the second lubricating ring sleeve 52 is extruded to drive the piston rod 5 to contract into the cylinder barrel 2, compared with the existing double-acting cylinder, the acting area of the compressed air on the piston is smaller than half, and the cylindrical volume formula V is obtained by pi (r ^2) h, the filling volume is more than four times smaller, so that under the condition of the same air source pressure, the whole stroke process of the piston column 5 has higher response speed, higher output force and continuous and stable power output compared with the existing cylinder structure;

the end of the guide post 4 close to the front end cover 12 is provided with a limit mechanism for limiting the stroke of the piston post 5, the middle section inside the piston post 5 is fixedly provided with a limit retaining ring 53 matched with the limit mechanism, the end head part of the piston post 5 is provided with an adjusting mechanism 8 for adjusting the stroke, wherein the limit mechanism comprises a screw rod 6 rotatably mounted at the end part of the guide post 4 and a limit block 7 sleeved outside the screw rod 6, the movement of the piston post 5 is limited by the limit retaining ring 53, the limit retaining ring 53 moves between the limit block 7 and the guide post 4 (namely the stroke length of the piston post 5), when the piston post 5 moves towards the limit block 7 under the condition that the first air cavity 501 is inflated, the right limit state is reached when the limit block 7 is collided, when the piston post 5 moves towards the guide post 4 under the condition that the second air cavity 502 is inflated, the left limit state is reached when the guide post 4 is collided, and when the stroke of the piston post 5 needs to be adjusted, can rotate lead screw 6 through adjustment mechanism 8, make the position of stopper 7 to the direction motion of being close to guide post 4 or keeping away from guide post 4, when stopper 7 is located 6 rightmost ends of lead screw, the stroke of piston post 5 is in maximum state, can adjust the position of stopper 7 according to the demand of product propelling movement distance to nimble effective stroke of adjusting piston post 5, at the practical application in-process, need not dismantle the change cylinder, save time.

Specifically, as shown in fig. 1 and 2, the end cap 1 includes a rear end cap 11 and a front end cap 12 disposed at two ends of the cylinder 2 for sealing the cylinder 2, the guide post 4 is fixed on the rear end cap 11, a first lubricating ring 51 and a second lubricating ring 52 for maintaining the axial movement of the piston post 5 stable are respectively fixed on the inner and outer side walls of one end of the piston post 5 close to the rear end cap 11, the first lubricating ring 51 and the second lubricating ring 52 are respectively attached to and slide on the outer side wall of the guide post 4 and the inner side wall of the cylinder 2, the rear end cap 11 is provided with a first air inlet channel 101 communicated with the electromagnetic valve, the guide post 4 and the first air chamber 501, the front end cap 12 is provided with a second air inlet channel 102 communicated with the electromagnetic valve and the second air chamber 502, the guide post 4 is fixedly connected with the rear end cap 11, the inner and outer side walls of one end of the piston post 5 close to the rear end cap 11 are respectively provided with the first lubricating ring 51 and the second lubricating ring 52, the first lubricating ring sleeve 51 and the second lubricating ring sleeve 52 are fixedly connected with the piston column 5, the first lubricating ring sleeve 51 is attached to and slides on the outer side wall of the guide column 4, the second lubricating ring sleeve 52 is attached to and slides on the inner side wall of the cylinder barrel 2, the first lubricating ring sleeve 51 is arranged on the inner wall of the left end of the piston column 5, the second lubricating ring sleeve 52 is arranged on the outer side wall, the first lubricating ring sleeve 51 and the second lubricating ring sleeve 52 are respectively attached to and slide on the walls of the guide column 4 and the cylinder barrel 2, friction force of the piston column 5 during movement can be reduced, the first lubricating ring sleeve 51 and the second lubricating ring sleeve 52 are distributed at a staggered distance, the piston column 5 can be supported to move in the cylinder barrel 2 along the length direction of the guide column 4, stability of the movement process is guaranteed, and stability of the cylinder in the working state is improved.

Specifically, as shown in fig. 1-3, the limiting mechanism includes a screw rod 6 rotatably mounted at an end of the guide post 4 and a limiting block 7 sleeved outside the screw rod 6, the limiting block 7 is in threaded fit with the screw rod 6 to adjust a position of the limiting block 7 on the screw rod 6, so that a stroke of the piston post 5 is adjustable, the limiting block 53 is movable between the limiting block 7 and the guide post 4, a movement of the piston post 5 is limited by the limiting block 53, the piston post 5 moves towards the limiting block 7 under an inflation condition of the first air cavity 501, the right limiting state is reached when colliding the limiting block 7, the piston post 5 moves towards the guide post 4 under an inflation condition of the second air cavity 502, the left limiting state is reached when colliding the guide post 4, when a stroke of the piston post 5 needs to be adjusted, the screw rod 6 can be rotated by the adjusting mechanism 8, so that the position of the limiting block 7 moves towards a direction close to the guide post 4 or away from the guide post 4, when the limiting block 7 is positioned at the rightmost end of the screw rod 6, the stroke of the piston column 5 is in the maximum state, the position of the limiting block 7 can be adjusted according to the requirement of the product pushing distance, so as to flexibly adjust the effective stroke of the piston column 5, in the practical application process, the air cylinder does not need to be disassembled and replaced, the time is saved, a movable cavity 505 is arranged in the piston column 5 corresponding to one side, away from the first air cavity 501, of the limiting check ring 53, the limiting block 7 and the adjusting mechanism 8 move in the movable cavity 505, a pressure relief hole 507 communicated with the movable cavity 505 is formed in the outer side wall of the piston column 5, in the moving process of the piston column 5, the limiting block 7, the screw rod 6 and the guide column 4 are in a relatively static state, the limiting block 7 relatively reciprocates in the movable cavity 505, and the air in the movable cavity 505 is exhausted or sucked through the pressure relief hole 507, so as to achieve pressure equalizing balance, thereby reducing the influence on the movement of the piston column 5, the distance between the second lubricating ring sleeve 52 and the limit retainer ring 53 is larger than the length of the screw rod 6, so that when the piston column 5 moves under the maximum stroke, the second lubricating ring sleeve 52 is ensured not to collide with the front end cover 12, and the working stability of the cylinder is improved.

Specifically, in fig. 3, an air guide channel 401 for communicating the first air inlet channel 101 and the first air cavity 501 is provided inside the guide post 4, the air guide channel 401 penetrates through two ends of the guide post 4, a screw rod mounting seat 41 for positioning an axial position of the screw rod 6 and freely sliding circumferentially is provided on the guide post 4, a second bearing 61 is fixedly provided between the screw rod 6 and the screw rod mounting seat 41, one end of the guide post 4 close to the screw rod 6 is provided with the screw rod mounting seat 41, a second bearing 61 is fixedly provided between the screw rod 6 and the screw rod mounting seat 41, the screw rod 6 and the screw rod mounting seat 41 are rotatably connected through the second bearing 61, the screw rod mounting seat 41 is provided at an end portion of the guide post 4 for connecting with the screw rod 6 so as to ensure that the screw rod 6 and the guide post 4 are relatively fixed in the axial direction, and the second bearing 61 is provided so as to facilitate the adjustment mechanism 8 to adjust the rotation of the screw rod 6, the position of the limiting block 7 is adjusted, and the stroke of the piston column 5 is changed.

Specifically, in fig. 3 and 6, a fixing frame 42 for supporting the lead screw mounting seat 41 to be stable and for communicating the air guide channel 401 is arranged between the inner side walls of the lead screw mounting seat 41 and the guide post 4, air holes 402 for communicating the air guide channel 401 with the first air cavity 501 are formed between the fixing frame 42 and the guide post 4 and between the fixing frame 42 and the guide post 41, the fixing frames 42 are circumferentially and uniformly distributed between the inner side walls of the lead screw mounting seat 41 and the guide post 4, one end of the lead screw mounting seat 41, which is far away from the lead screw 6, is in a conical shape with an arc surface, the lead screw mounting seat 41 and the guide post 4 are fixed by the fixing frames 42 formed by six rectangular plates which are centrally and symmetrically distributed, the air guide channel 401 is expanded at the lead screw mounting seat 41 and is partitioned by the fixing frames 42 to form the air holes 402, the air of the air source directly passes through the air guide channel 401 and is further partitioned into multiple paths to be ejected from the air holes 402 and directly acts on the limit retaining ring 53, the piston column 5 is pushed to extend outwards, the acting section is small, the pressure is relatively large, the piston column 5 can be extruded to move quickly, and the starting speed of the piston column 5 is improved.

Specifically, in fig. 2, 3, 5, 6 and 7, the adjusting mechanism 8 includes a knurling shaft 81, a knob cap 82 and a positioning cap 83, one end of the knurling shaft 81 is fixedly connected with the knob cap 82 rotatably engaged with the piston post 5, a knurling groove 601 engaged with the knurling shaft 81 is formed on the screw 6, the other end of the knurling shaft 81 is located in the movable chamber 505 and extends into the knurling groove 601, so that the screw 6 and the knurling shaft 81 are circumferentially fixed and can axially slide, one end of the knurling shaft 81 is fixedly connected with the knob cap 82, and the knob cap 82 is rotatably connected with the piston post 5, so that the knurling shaft 81 is axially fixed relative to the piston post 5 and can rotate in the circumferential direction, while the other end of the knurling shaft 81 is inserted into the knurling groove 601 inside the screw 6, by screwing the knob cap 82, the screw 6 can be driven to rotate by the knurling shaft 81, and the limit block 7 is limited by the guide rail 54 on the inner wall of the movable chamber 505, the piston post can not rotate along with the piston post 5, the piston post can only transmit on the screw rod 6, the position on the screw rod 6 is changed, the effect of adjusting the stroke of the piston post 5 is achieved, when the piston post 5 moves in a reciprocating mode, the knurled shaft 81 moves along with the piston post 5, the knurled shaft 81 slides in a reciprocating mode in the knurled groove 601, the state of the screw rod 6 is not affected, a positioning clamping groove 506 is formed in the end portion of the piston post 5, corresponding to the knob cap 82, a positioning cap 83 used for limiting the knob cap 82 in the circumferential direction is installed in the positioning clamping groove 506 in a clamping mode, a rodent ring 831 in clamping fit with the positioning clamping groove 506 is arranged on the circumferential side wall of the positioning cap 83, a jaw groove 832 is formed in the outer side wall of the positioning cap 83, a screwdriver edge is formed in the knob cap 82, a chuck in clamping fit with the screwdriver edge is arranged on the positioning cap 83, corresponding to the abutting surface of the knob cap 82, when the stroke of the piston post 5 needs to be adjusted, the knob cap 82 is rotated by the screwdriver, the stroke is adjusted, after the adjustment is finished, the clamping head on the positioning cap 83 is correspondingly clamped with the screwdriver edge on the knob cap 82, then the meshing gear ring 831 of the positioning cap 83 is clamped into the positioning clamping groove 506 at the end part of the piston column 5, so that the positioning cap 83 and the piston column 5 are in a relatively fixed state, and therefore the piston column 5 can be ensured to move, the circumferential positions of the knurling shaft 81, the screw rod 6 and the limiting block 7 cannot change due to reciprocating collision, a stable state is achieved, the adjusting mechanism 8 can also be an electric driving mechanism and is used for driving the screw rod 6 to rotate, the adjusting mechanism 8 can be electrically connected with an external control mechanism, the screw rod 6 is automatically controlled to rotate, and the purpose of adjusting the position of the limiting block 7 is achieved.

Specifically, in fig. 2 and 8, the contact surface between the second lubricant ring sleeve 52 and the cylinder barrel 2 and the contact surface between the first lubricant ring sleeve 51 and the guide post 4 are both provided with a graphite copper sleeve 55, the graphite copper sleeve 55 is fixedly connected with the first lubricant ring sleeve 51 and the second lubricant ring sleeve 52, the piston post 5, the first lubricant ring sleeve 51 and the guide post 4 are provided with an air gap 504, the second lubricant ring sleeve 52 and the cylinder barrel 2 are provided with an air gap 504, a transition air chamber 503 is provided between the first air chamber 501 and the second air chamber 502, the first air chamber 501, the second air chamber 502 and the transition air chamber 503 are communicated through the air gap 504, the friction between the piston post 5 and the cylinder barrel 2 and the guide post 4 in the process of movement can be reduced by providing the graphite copper sleeve 55, and after the first air chamber 501 is filled with air, the air can be filled along the surface of the guide post 4 to the direction of the transition air chamber 503, so that the air gap 504 is formed between the piston post 5 and the guide post 4, therefore, the friction force between the piston post 5 and the guide post 4 can be further reduced, the heat generated by the reciprocating motion of the piston post 5 is reduced, and in the reverse process, after the second air chamber 502 is filled with air, an air gap 504 is formed between the second lubricating ring sleeve 52 and the cylinder barrel 2, and the friction force between the piston post 5 and the cylinder barrel 2 can also be reduced, so that in the whole reciprocating motion process of the piston post 5, the air gap 504 formed under the action of air flow can reduce the friction heat generated by the reciprocating motion of the piston post 5, reduce energy loss, and enable the cylinder to have higher response speed, higher output force and continuous and stable power output in the whole motion process.

Specifically, as shown in fig. 4, a transmission ring 58 is arranged at a connection position of the limit retainer ring 53 and the lead screw 6, the transmission ring 58 is sleeved outside the lead screw 6, the transmission ring 58 is in transmission fit with the lead screw 6, a first bearing 56 is fixedly arranged between the transmission ring 58 and the limit retainer ring 53, the transmission ring 58 is in rotational connection with the limit retainer ring 53 through the first bearing 56, buffer rings 57 are arranged on both sides of the limit retainer ring 53, the buffer rings 57 are attached and fixed on both sides of the limit retainer ring 53, the transmission ring 58 is in transmission fit with the lead screw 6, the action surfaces of the transmission ring 58 and the lead screw 6 are smooth, gaps are small, and can play a role in blocking air flow, when the piston column 5 moves, the transmission ring 58 rotates on the surface of the lead screw 6 at a high speed, the first bearing 56 is arranged to reduce resistance to the limit retainer ring 53 during the movement, the buffer rings 57 arranged on both sides can be positioned between the limit retainer ring 53 and the guide column 4, The limiting block 7 plays a role in buffering when colliding.

Specifically, in fig. 4 and 5, be equipped with on the inside wall of activity chamber 505 and be equipped with the spacing guide rail 54 to stopper 7 circumference, guide rail 54 and piston post 5 fixed connection, offer on the circumference lateral wall of stopper 7 with guide rail 54 complex guide way 71, stopper 7 and guide rail 54 sliding connection, through set up guide rail 54 on the inner wall of activity chamber 505, can play the spacing effect of circumference to stopper 7, avoid spacing retaining ring 53 to the reciprocating collision in-process of stopper 7, cause the aversion of stopper 7, lead to the stroke change, be used for guaranteeing the accuracy of stroke and the stability between the part.

The working principle and the using process of the invention are as follows: when the device is used, the electromagnetic valves are arranged on the two end covers 1 and are communicated with the air source to control the on-off of the air source, when the electromagnetic valve on the rear end cover 11 is opened, the air is inflated to the piston column 5 direction through the guide column 4 by the first air inlet channel 101 to form a first air cavity 501, the air entering from the first air inlet channel 101 is directly blown to the limit check ring 53 in the piston column 5 after being guided by the guide column 4, the air rapidly rushes into the first air cavity 501 with small space in a short time, the action section is small, the pressure is relatively large, the piston column 5 can be extruded to rapidly move to drive the piston column 5 to extend out of the cylinder barrel 2, after the first air cavity 501 is filled with the air, the air can be filled to the direction of the transition air cavity 503 along the surface of the guide column 4 to form an air gap 504 between the piston column 5 and the guide column 4, so that the friction force between the piston column 5 and the guide column 4 can be further reduced, and the heat generated by the piston column 5 due to reciprocating motion can be reduced, in the process of extending the piston post 5, the limit retainer ring 53 moves rightwards under the action of air flow, the transmission ring 58 on the inner side of the limit retainer ring 53 rotates at a high speed on the surface of the screw rod 6, when the limit retainer ring 53 in the piston post 5 reaches a right limit position and collides with the limit block 7 to reach the right limit position, the buffer rings 57 arranged on two sides of the limit retainer ring 53 can play a buffer role when the limit retainer ring 53 collides with the guide post 4 and the limit block 7, the electromagnetic valve on the front end cover 12 is opened to blow air at the moment, the electromagnetic valve on the rear end cover 11 inhales air, the piston post 5 moves towards the direction of the guide post 4 under the condition that the second air cavity 502 is inflated, when the limit retainer ring 53 collides with the guide post 4 to reach a left limit state, when the stroke of the piston post 5 needs to be adjusted, the screw rod 6 can be rotated through the adjusting mechanism 8, so that the position of the limit block 7 moves towards the direction close to the guide post 4 or away from the guide post 4, when the limiting block 7 is located at the rightmost end of the screw rod 6, the stroke of the piston column 5 is in the maximum state, when the stroke is adjusted, the position state shrinkage of the piston column 5 needs to be reset to zero, and the piston column is gradually adjusted to a proper stroke after the adjustment is finished so as to adapt to different working environments.

In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a variable stroke cylinder, includes cylinder (2) and fixed mounting end cover (1) at cylinder (2) both ends, the externally mounted of end cover (1) has the solenoid valve that is used for controlling the gas circuit break-make, its characterized in that: a telescopic and movable piston column (5) is installed inside the cylinder barrel (2), a guide column (4) for guiding the moving direction of the piston column (5) is fixedly arranged inside the cylinder barrel (2), the piston column (5) is sleeved on the outer wall of the guide column (4) in a sliding manner, and a guide sleeve (3) matched with the piston column (5) is fixedly installed on the end cover (1);

a first air cavity (501) for pushing the piston column (5) to extend is formed between the piston column (5) and the guide column (4), and a second air cavity (502) for pushing the piston column (5) to contract is formed between the piston column (5) and the cylinder barrel (2);

the end of the guide column (4) is provided with a limiting mechanism for limiting the stroke of the piston column (5), the middle section in the piston column (5) is fixedly provided with a limiting check ring (53) matched with the limiting mechanism, and the end head of the piston column (5) is provided with an adjusting mechanism (8) for adjusting the stroke.

2. A variable stroke cylinder according to claim 1, wherein: the end cover (1) comprises a rear end cover (11) and a front end cover (12) which are arranged at two ends of the cylinder barrel (2) and used for sealing the cylinder barrel (2), the guide post (4) is fixed on the rear end cover (11), a first lubricating ring sleeve (51) and a second lubricating ring sleeve (52) for maintaining the axial motion state of the piston post (5) to be stable are respectively and fixedly arranged on the inner side wall and the outer side wall of one end, close to the rear end cover (11), of the piston post (5), the first lubricating ring sleeve (51) and the second lubricating ring sleeve (52) are respectively attached to and slide on the outer side wall of the guide column (4) and the inner side wall of the cylinder barrel (2), the rear end cover (11) is provided with a first air inlet duct (101) communicated with the electromagnetic valve, the guide post (4) and the first air cavity (501), and a second air inlet duct (102) communicated with the electromagnetic valve and the second air cavity (502) is arranged on the front end cover (12).

3. A variable stroke cylinder according to claim 2, wherein: the limiting mechanism comprises a screw rod (6) rotatably arranged at the end part of the guide post (4) and a limiting block (7) sleeved outside the screw rod (6), the limiting block (7) is in threaded fit with the screw rod (6) and used for adjusting the position of the limiting block (7) on the screw rod (6), the limiting retainer ring (53) is movably arranged between the limiting block (7) and the guide post (4), a movable cavity (505) for accommodating the limiting block (7) and the adjusting mechanism (8) is arranged in the piston column (5), the first air cavity (501) and the movable cavity (505) are separated by the limit check ring (53), the outer side wall of the piston column (5) is provided with a pressure relief hole (507) communicated with the movable cavity (505), the distance between the second lubricating ring sleeve (52) and the limit retainer ring (53) is larger than the length of the screw rod (6).

4. A variable stroke cylinder according to claim 3, wherein: an air guide channel (401) used for communicating the first air inlet duct (101) and the first air cavity (501) is formed in the guide column (4), a screw rod mounting seat (41) used for positioning the axial position of the screw rod (6) and freely sliding in the circumferential direction is arranged on the guide column (4), and a second bearing (61) is fixedly arranged between the screw rod (6) and the screw rod mounting seat (41).

5. A variable stroke cylinder according to claim 4, wherein: a fixing frame (42) used for supporting the stability of the screw rod installation seat (41) and conducting the air guide channel (401) is arranged between the screw rod installation seat (41) and the inner side wall of the guide column (4), and an air hole (402) used for communicating the air guide channel (401) and the first air cavity (501) is formed between the fixing frame (42) and the guide column (4) and between the fixing frame (42) and the screw rod installation seat (41).

6. A variable stroke cylinder according to claim 3, wherein: adjustment mechanism (8) are including knurling axle (81), knob cap (82) and location cap (83), the one end fixedly connected with of knurling axle (81) with piston post (5) normal running fit knob cap (82), seted up on lead screw (6) with knurling axle (81) complex knurling groove (601), the other end of knurling axle (81) is located in activity chamber (505) and stretch into to in the knurling groove (601), so that lead screw (6) with circumference is fixed between knurling axle (81), can follow endwise slip.

7. A variable stroke cylinder according to claim 6, wherein: the tip of piston post (5) corresponds positioning channel groove (506) have been seted up in knob cap (82) department, it is right that positioning channel groove (506) interior snap fit is used for knob cap (82) circumference spacing positioning cap (83), be equipped with on the week lateral wall of positioning cap (83) with positioning channel groove (506) block complex nibbling ring gear (831), jaw groove (832) have been seted up on the lateral wall of positioning cap (83).

8. A variable stroke cylinder according to claim 2, wherein: the contact surface of the second lubricating ring sleeve (52) and the cylinder barrel (2), the contact surface of the first lubricating ring sleeve (51) and the guide post (4) are respectively and fixedly provided with a graphite copper sleeve (55) for lubrication, air gaps (504) are arranged among the piston post (5), the first lubricating ring sleeve (51) and the guide post (4), the air gaps (504) are arranged between the second lubricating ring sleeve (52) and the cylinder barrel (2), a transition air cavity (503) is arranged between the first air cavity (501) and the second air cavity (502), and the first air cavity (501), the second air cavity (502) and the transition air cavity (503) are communicated through the air gaps (504).

9. A variable stroke cylinder according to claim 3, wherein: spacing retaining ring (53) with the junction of lead screw (6) is equipped with drive ring (58), drive ring (58) cover is established the outside of lead screw (6), just drive ring (58) with lead screw (6) transmission cooperation, drive ring (58) with first bearing (56) have set firmly between spacing retaining ring (53), drive ring (58) with pass through between spacing retaining ring (53) first bearing (56) rotate to be connected, the both sides of spacing retaining ring (53) all are equipped with buffer ring (57), buffer ring (57) laminating is fixed the both sides of spacing retaining ring (53).

10. A variable stroke cylinder according to claim 3, wherein: be equipped with on the inside wall in activity chamber (505) right stopper (7) circumference spacing guide rail (54), guide rail (54) with piston post (5) fixed connection, seted up on the week lateral wall of stopper (7) with guide rail (54) complex guide way (71), stopper (7) with guide rail (54) sliding connection.