CN113983027A

CN113983027A - Cylinder structure

Info

Publication number: CN113983027A
Application number: CN202111233463.9A
Authority: CN
Inventors: 邹小燕; 卞立桃; 胡翀瑕
Original assignee: Ningbo Kunyi Pneumatic Technology Co ltd
Current assignee: Ningbo Kunyi Pneumatic Technology Co ltd
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2022-01-28
Anticipated expiration: 2041-10-22

Abstract

The invention discloses a cylinder structure, which comprises a body, wherein a containing cavity is formed in the body, a large piston is arranged in the containing cavity, the containing cavity is divided into a rod cavity and a rodless cavity by the large piston, an inner front cover is fixedly arranged on the large piston, and a blade is arranged on the inner front cover; a small piston assembly is arranged in the large piston and comprises an inner cylinder barrel and a piston rod, a piston cavity is formed between the inner cylinder barrel and the large piston, the piston rod is integrally formed with the small piston, and the small piston divides the piston cavity into a front cavity and a rear cavity; the piston rod is provided with a clamping piece, and an elastic piece is arranged in the rear cavity; the body is provided with a first air passage and a second air passage, the first air passage is communicated with the rodless cavity, the second air passage is communicated with the rod cavity, the large piston is provided with an air flow channel, the inner cylinder barrel is provided with an air vent, and the air flow channel is communicated with the rodless cavity and the air vent; the piston rod is provided with a communicating hole. The invention has the following advantages and effects: the new mechanical structure of this scheme utilization has great clamping-force, the higher effect of reliability.

Description

Cylinder structure

Technical Field

The invention relates to the field of cylinders, in particular to a cylinder structure.

Background

The cylinder is the most common pneumatic component in automated production, and mainly includes single-acting cylinder, double-acting cylinder, diaphragm formula cylinder, strikes cylinder and rodless cylinder, can realize through different cylinders that press from both sides and get, purpose such as jacking, compress tightly.

The current chinese patent with publication number CN204686883U discloses a novel clamping jaw cylinder structure, including cylinder and clamping jaw, a side of cylinder is provided with the cylinder connecting plate, and one side of cylinder connecting plate is provided with first round hole, and first round hole can penetrate the guiding axle, and the cylinder bottom is provided with two clamping jaw connecting blocks, sets up the second round hole on the clamping jaw connecting block, is provided with the bush on the second round hole, and the guiding axle stretches into in bush and the first round hole, connects cylinder connecting plate and clamping jaw connecting block, and the clamping jaw is connected to the clamping jaw connecting block. During the use, two clamping jaw connecting blocks of accessible cylinder drive move for two clamping jaws are close to each other, realize snatching of article.

However, the novel clamping jaw air cylinder structure has the following disadvantages: because the two clamping jaws move close to each other along the horizontal direction through the air cylinder to realize clamping, the defects of small clamping force and low reliability exist in the process of grabbing objects.

Disclosure of Invention

The invention aims to provide a cylinder structure which has the effects of higher clamping force and higher reliability.

The technical purpose of the invention is realized by the following technical scheme: a cylinder structure comprises a body, wherein a plurality of accommodating cavities are formed in the body, large pistons are movably arranged in the accommodating cavities, the accommodating cavities are divided into rod cavities and rodless cavities by the large pistons, inner front covers are fixedly arranged on the large pistons, and blades outside the body are fixedly arranged on the inner front covers;

a small piston assembly is arranged in the large piston and comprises an inner cylinder barrel and a piston rod, a piston cavity is formed between the inner cylinder barrel and the large piston, the piston rod reciprocates in the piston cavity, the piston rod is integrally formed with the small piston, and the small piston divides the piston cavity into a front cavity and a rear cavity; the end part of the piston rod extending out of the body is provided with a clamping piece which is clamped and matched with the blade, and an elastic piece is arranged in the rear cavity and enables the piston rod to always have the movement trend of extending out of the inner cylinder barrel;

the body is provided with a first air passage and a second air passage, the first air passage is communicated with the rodless cavity, the second air passage is communicated with the rod cavity, the large piston is provided with an air flow channel, the inner cylinder barrel is provided with an air vent communicated with the front cavity, and the air flow channel is communicated with the rodless cavity and the air vent; the piston rod is provided with a communicating hole for communicating the rear cavity with the atmosphere.

By adopting the technical scheme, in the using process, the air is introduced into the first air passage, the air flow is led to the rodless cavity, and the large piston is pushed to move towards the rod cavity, so that the large piston drives the blade and the clamping piece of the small piston assembly to extend out in the direction far away from the body; meanwhile, gas in the rodless cavity is introduced into the front cavity through the airflow channel and the vent hole, the air pressure of the front cavity is gradually increased, the piston rod is pushed to retract towards the body, the elastic part is extruded, the air pressure in the rear cavity is gradually discharged through the communication hole in the process, and when the piston rod retracts, the clamping piece is separated from the blade; when clamping is needed to be achieved, air is introduced into the second air passage, air flow is communicated to the rod cavity, air in the rodless cavity is exhausted from the first air passage, the large piston is pushed to move towards the rodless cavity, and the large piston drives the blade and the clamping piece of the small piston assembly to retract towards the body at the same time; simultaneously, the atmospheric pressure that communicates in the front chamber in no pole chamber reduces gradually, under the elastic force effect of elastic component, make the piston rod stretch out to the direction of keeping away from the body, the air in this in-process atmosphere lets in to the back intracavity from the intercommunicating pore, after the piston rod resets completely, the clamping piece offsets tightly along the axial with the blade, can carry out the centre gripping to the article that lies in between clamping piece and blade, because the article is by the shutoff of the intercommunicating pore in the twinkling of an eye of centre gripping, can make the back chamber realize the pressurize, clamping-force is great, clamping process's reliability is stronger, more firm.

The invention is further provided with: the elastic piece is set as a return spring, one end of the return spring is abutted against the end face of the small piston, and the other end of the return spring is abutted against the inner wall of the large piston.

The invention is further provided with: the elastic piece is set as a return spring, a flat pad is arranged in the piston cavity, one end of the return spring is abutted against the end face of the small piston, and the other end of the return spring is abutted against the flat pad.

By adopting the technical scheme, one end of the reset spring is abutted against the flat pad, so that the stability of the reset spring can be improved to a certain extent, and the reset spring can be abutted and matched with the tail part of the piston rod.

The invention is further provided with: the body is provided with a front end cover, the large piston is arranged in the accommodating cavity through the front end cover, and a sealing ring is arranged between the inner wall of the front end cover and the outer wall of the large piston.

Through adopting above-mentioned technical scheme, when big piston moves relative body, the sealing washer can play better sealed effect, prevents gas leakage, has higher leakproofness.

The invention is further provided with: a guide rod is fixedly arranged on the inner front cover, the guide rod is arranged along the axial direction of the large piston, and the blade is fixedly arranged at the end part of the guide rod; the body is correspondingly provided with a guide hole, and the guide hole and the accommodating cavity are adjacently arranged.

Through adopting above-mentioned technical scheme, when big piston drives the blade motion, guide arm and guide hole direction cooperation can make big piston keep higher linearity and stability when the motion to a certain extent for clamping piece and the accurate centre gripping of blade.

The invention is further provided with: the communicating hole is penetratingly arranged in the center of the piston rod and comprises a large hole and a small hole which are communicated with each other, the small hole is communicated with the atmosphere, and the large hole is communicated with the rear cavity; the side wall of the piston rod positioned in the rear cavity is provided with a side wall hole.

Through adopting above-mentioned technical scheme, the gaseous accessible tiny hole in the back chamber is discharged to outside environment slowly, can prevent to a certain extent the condition that air leakage appears in the centre gripping in-process.

The invention is further provided with: the opening of the first air passage and the air flow passage are arranged in a staggered mode.

Through adopting above-mentioned technical scheme, with first air duct and airflow channel dislocation set for the air current lets in the no pole intracavity back from first air duct, receives stopping of big piston earlier, just can let in to the antechamber through airflow channel afterwards, forms certain time difference, makes the clamping piece realize stretching out earlier the motion process of back withdrawal.

The invention is further provided with: the outer wall of the large piston is provided with a double-channel GREEN ring which is in sealing fit with the inner wall of the containing cavity of the body.

The invention is further provided with: an O-shaped ring is arranged between the outer wall of the inner cylinder barrel and the inner wall of the large piston, and the O-shaped ring separates the airflow channel from the rear cavity of the piston cavity.

Through adopting above-mentioned technical scheme, the O shape circle can prevent that the gas in the air current passageway from letting in to the back chamber through the gap between big piston and the interior cylinder terminal surface for have better leakproofness between big piston and the interior cylinder.

In conclusion, the invention has the following beneficial effects:

1. the clamping piece and the blade are driven to move simultaneously when the large piston moves, and the clamping piece is driven to move independently when the piston rod of the small piston moves, so that the object is clamped axially by the blade and the clamping piece moving axially, and the instant communicating hole of the clamped object is blocked, so that the rear cavity can realize continuous pressure maintaining, the clamping force is large, and the reliability of the clamping process is strong and firm;

2. the guide rod is fixedly arranged on the inner front cover and is in guide fit with the guide hole of the body, so that when the large piston drives the blade to move, the large piston can keep higher linearity and stability during movement to a certain extent, and the blade is accurately clamped with the blade;

3. the adoption is with the road junction of first air flue and airflow channel dislocation set's mode for the air current lets in the no pole intracavity back from first air flue, receives the blockking of big piston earlier, just can let in to the antechamber through airflow channel afterwards, forms certain time difference, makes the clamping piece realize stretching out earlier the motion process of back withdrawal.

Drawings

Fig. 1 is a schematic diagram of the overall structural relationship of the embodiment.

Fig. 2 is a top view of the embodiment.

Fig. 3 is a sectional view of section a-a in fig. 2.

Fig. 4 is a side view of the embodiment.

Fig. 5 is a sectional view of section B-B in fig. 4.

Fig. 6 is an exploded view of the embodiment.

In the figure: 1. a body; 11. an accommodating chamber; 111. a rod cavity; 112. a rodless cavity; 12. a front end cover; 13. a guide hole; 14. a first air passage; 15. a second air passage; 2. a large piston; 21. a seal ring; 22. an inner front cover; 221. connecting blocks; 222. a bolt; 223. a guide bar; 23. a Glare circle; 24. a piston cavity; 241. a front cavity; 242. a rear cavity; 25. a return spring; 26. flattening the cushion; 27. an air flow channel; 3. a blade; 4. an inner cylinder barrel; 41. a vent hole; 42. a gap; 43. an O-shaped ring; 5. a piston rod; 51. a small piston; 52. a clip; 521. a through hole; 53. a communicating hole; 531. macropores; 532. a fine pore; 54. a sidewall hole; 6. an airway connector.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

A cylinder structure, as shown in fig. 1-3, comprises a body 1, a plurality of accommodating cavities 11 are formed in the body 1, a front end cover 12 is installed on the body 1, a large piston 2 is movably arranged in the accommodating cavity 11, the large piston 2 is installed in the accommodating cavity 11 through the front end cover 12, a sealing ring 21 is arranged between the inner wall of the front end cover 12 and the outer wall of the large piston 2, the sealing ring 21 is embedded into the inner wall of the front end cover 12, when the large piston 2 moves relative to the body 1, the sealing ring 21 can play a good sealing role, air leakage is prevented, and high sealing performance is achieved. The large piston 2 divides the accommodating cavity 11 into a rod cavity 111 and a rodless cavity 112, an inner front cover 22 is fixedly arranged at the front end of the large piston 2, and the inner front cover 22 is fixedly provided with a blade 3 positioned outside the body 1 through a connecting block 221. The outer wall of the large piston 2 is provided with a double-channel Glare ring 23, and the Glare ring 23 is in sealing fit with the inner wall of the containing cavity 11 of the body 1.

As shown in fig. 1 and 6, a guide rod 223 is fixedly mounted on the inner front cover 22 through a bolt 222, the guide rod 223 is arranged along the axial direction of the large piston 2, and the blade 3 is fixedly mounted at the end of the guide rod 223; the body 1 is correspondingly provided with a guide hole 13, and the guide hole 13 is adjacent to the accommodating cavity 11. When the big piston 2 drives the blade 3 to move, the guide rod 223 is in guide fit with the guide hole 13, so that the big piston 2 can keep high linearity and stability during movement to a certain extent, and the clamping piece 52 and the blade 3 can be accurately clamped.

As shown in fig. 3, a small piston assembly is arranged in the large piston 2, the small piston assembly comprises an inner cylinder 4 and a piston rod 5, the inner cylinder 4 is fixedly installed in the large piston 2 through threads, a piston cavity 24 is formed between the inner cylinder 4 and the large piston 2, the piston rod 5 reciprocates in the piston cavity 24, a small piston 51 is integrally formed on the side wall of the piston rod 5, and the piston cavity 24 is divided into a front cavity 241 and a rear cavity 242 by the small piston 51. The end part of the piston rod 5 extending out of the body 1 is provided with a clamping piece 52 which is clamped and matched with the blade 3, the clamping piece 52 is in a vertical state, the blade 3 is in a horizontal state, and the clamping piece and the blade form a cross shape after being clamped; an elastic element is arranged in the rear cavity 242, and in the embodiment, the elastic element is a return spring 25, and the return spring 25 enables the piston rod 5 to always have the movement tendency of extending out of the inner cylinder 4. A flat pad 26 is arranged in the piston cavity 24, one end of the return spring 25 abuts against the end face of the small piston 51, and the other end of the return spring 25 abuts against the flat pad 26. The rear end of the return spring 25 is abutted against the flat pad 26, so that the stability of the return spring 25 can be improved to a certain extent, and the return spring can be abutted and matched with the tail part of the piston rod 5.

As shown in fig. 3-5, an air passage connecting piece 6 is disposed in the center of the body 1, the body 1 is provided with a first air passage 14 and a second air passage 15, the first air passage 12 is communicated with the air passage connecting piece 6, the first air passage 14 is communicated with the rodless cavity 112, the second air passage 15 is communicated with the rod cavity 111, the large piston 2 is provided with an air flow passage 27, the inner cylinder 4 is provided with a vent hole 41 communicated with the front cavity 241, the air flow passage 27 is communicated with the rodless cavity 112 and the vent hole 41, a gap 42 is formed between the inner cylinder 4 and the large piston 2, and the gap 42 enables the air flow passage 27 to be communicated with the vent hole 41. The opening of the first air duct 14 is offset from the air flow channel 27. An O-shaped ring 43 is arranged between the outer wall of the inner cylinder barrel 4 close to the rear cavity 242 and the inner wall of the large piston 2, and the O-shaped ring 43 cuts off the airflow channel 27 from the rear cavity 242 of the piston cavity 24. The O-shaped ring 43 can prevent the gas in the gas flow channel 27 from being introduced into the rear cavity 242 through the gap 42 between the large piston 2 and the end face of the inner cylinder 4, so that the large piston 2 and the inner cylinder 4 have better sealing performance.

As shown in fig. 3 and 6, a communication hole 53 communicating the rear cavity 242 with the atmosphere is formed in the center of the piston rod 5, the communication hole 53 is penetratingly formed in the piston rod 5, the communication hole 53 includes a large hole 531 and a small hole 532 which are communicated, the small hole 532 is communicated with the atmosphere, and the large hole 531 is communicated with the rear cavity 242; the side wall of the piston rod 5 located in the rear cavity 242 is provided with a side wall hole 54, and the center of the clamping piece 52 is provided with a through hole 521 corresponding to the small hole 532. The gas in the rear cavity 242 can be slowly exhausted to the external environment through the fine holes 532, which can prevent the occurrence of gas leakage in the clamping process to a certain extent.

The basic working principle of the invention is as follows: in the use process, the air is introduced into the first air passage 14, the air flow is communicated to the rodless cavity 112, and the large piston 2 is pushed to move towards the rod cavity 111, so that the large piston 2 drives the blade 3 and the clamping piece 52 of the small piston assembly to extend out in the direction far away from the body 1; meanwhile, the air in the rodless cavity 112 is introduced into the front cavity 241 through the air flow channel 27 and the vent hole 41, the air pressure in the front cavity 241 is gradually increased, the piston rod 5 is pushed to retract towards the body 1, the elastic part is extruded, the air pressure in the rear cavity 242 is gradually discharged through the communication hole 53 in the process, and when the piston rod 5 retracts, the clamping piece 52 is separated from the blade 3; when clamping is required to be achieved, air is introduced into the second air passage 15, air flow is communicated to the rod cavity 111, air in the rodless cavity 112 is exhausted from the first air passage 14, the large piston 2 is pushed to move towards the rodless cavity 112, and the large piston 2 drives the blade 3 and the clamping piece 52 of the small piston assembly to retract towards the direction close to the body 1; meanwhile, the air pressure of the front cavity 241 communicated with the rodless cavity 112 is gradually reduced, under the elastic force action of the elastic piece, the piston rod 5 extends out in the direction away from the body 1, air in the atmosphere is introduced into the rear cavity 242 from the communication hole 53 in the process, when the piston rod 5 completely resets, the clamping piece 52 and the blade 3 are abutted in the axial direction, an object positioned between the clamping piece 52 and the blade 3 can be clamped, and the rear cavity 242 can realize pressure maintaining due to the fact that the communication hole 53 is plugged in the moment when the object is clamped, the clamping force is large, and the reliability in the clamping process is high and firm. The first air passage 14 and the air flow passage 27 are arranged in a staggered manner, so that after the air flow enters the rodless cavity 112 from the first air passage 14, the air flow is blocked by the large piston 2, and then the air flow can enter the front cavity 241 through the air flow passage 27, a certain time difference is formed, and the clip 52 achieves the movement process of extending firstly and retracting secondly.

The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.

Claims

1. The utility model provides a cylinder structure, including body (1), it holds chamber (11) to have seted up a plurality ofly in body (1), its characterized in that: a large piston (2) is movably arranged in the accommodating cavity (11), the accommodating cavity (11) is divided into a rod cavity (111) and a rodless cavity (112) by the large piston (2), an inner front cover (22) is fixedly arranged on the large piston (2), and a blade (3) positioned outside the body (1) is fixedly arranged on the inner front cover (22);

a small piston assembly is arranged in the large piston (2), the small piston assembly comprises an inner cylinder barrel (4) and a piston rod (5), a piston cavity (24) is formed between the inner cylinder barrel (4) and the large piston (2), the piston rod (5) reciprocates in the piston cavity (24), a small piston (51) is integrally formed on the piston rod (5), and the piston cavity (24) is divided into a front cavity (241) and a rear cavity (242) by the small piston (51); the end part of the piston rod (5) extending out of the body (1) is provided with a clamping piece (52) which is clamped and matched with the blade (3), an elastic piece is arranged in the rear cavity (242), and the elastic piece enables the piston rod (5) to have a movement trend of extending out of the inner cylinder barrel (4) all the time;

the body (1) is provided with a first air passage (14) and a second air passage (15), the first air passage (14) is communicated with the rodless cavity (112), the second air passage (15) is communicated with the rod cavity (111), the large piston (2) is provided with an air flow channel (27), the inner cylinder (4) is provided with a vent hole (41) communicated with the front cavity (241), and the air flow channel (27) is communicated with the rodless cavity (112) and the vent hole (41); the piston rod (5) is provided with a communication hole (53) for communicating the rear cavity (242) with the atmosphere.

2. A cylinder structure according to claim 1, wherein: the elastic piece is set to be a return spring (25), one end of the return spring (25) abuts against the end face of the small piston (51), and the other end of the return spring (25) abuts against the inner wall of the large piston (2).

3. A cylinder structure according to claim 1, wherein: the elastic piece is set to be a return spring (25), a flat pad (26) is arranged in the piston cavity (24), one end of the return spring (25) abuts against the end face of the small piston (51), and the other end of the return spring (25) abuts against the flat pad (26).

4. A cylinder structure according to claim 1, wherein: the piston type piston is characterized in that a front end cover (12) is installed on the body (1), the large piston (2) is installed in the accommodating cavity (11) through the front end cover (12), and a sealing ring (21) is arranged between the inner wall of the front end cover (12) and the outer wall of the large piston (2).

5. A cylinder structure according to claim 1, wherein: a guide rod (223) is fixedly installed on the inner front cover (22), the guide rod (223) is arranged along the axial direction of the large piston (2), and the blade (3) is fixedly installed at the end part of the guide rod (223); the body (1) is correspondingly provided with a guide hole (13), and the guide hole (13) is adjacent to the accommodating cavity (11).

6. A cylinder structure according to claim 1, wherein: the communication hole (53) is penetratingly arranged in the center of the piston rod (5), the communication hole (53) comprises a large hole (531) and a small hole (532), the large hole (531) and the small hole (532) are communicated with the atmosphere, and the rear cavity (242) is communicated with the large hole (532); and a side wall hole (54) is formed in the side wall of the piston rod (5) positioned in the rear cavity (242).

7. A cylinder structure according to claim 1, wherein: the opening of the first air channel (14) and the airflow channel (27) are arranged in a staggered mode.

8. A cylinder structure according to claim 1, wherein: the outer wall of the large piston (2) is provided with two GREEN rings (23), and the GREEN rings (23) are in sealing fit with the inner wall of the accommodating cavity (11) of the body (1).

9. A cylinder structure according to claim 1, wherein: an O-shaped ring (43) is arranged between the outer wall of the inner cylinder barrel (4) and the inner wall of the large piston (2), and the air flow channel (27) is separated from the rear cavity (242) of the piston cavity (24) by the O-shaped ring (43).