CN114623122B

CN114623122B - High-pressure swing hydraulic cylinder

Info

Publication number: CN114623122B
Application number: CN202210365566.9A
Authority: CN
Inventors: 周俊杰; 武艺; 荆崇波
Original assignee: Beijing Institute of Technology BIT
Current assignee: Beijing Institute of Technology BIT
Priority date: 2022-04-07
Filing date: 2022-04-07
Publication date: 2023-05-02
Anticipated expiration: 2042-04-07
Also published as: CN114623122A

Abstract

The invention relates to a high-pressure swing hydraulic cylinder, which comprises a cylinder body and a cylinder cover which are mutually covered, wherein an output shaft is arranged in the cylinder body and is respectively in rotary connection with the cylinder body and the cylinder cover, the output shaft comprises a front baffle wall and a rear baffle wall which are mutually arranged at intervals, the front baffle wall and the rear baffle wall are respectively in sealing contact with the inner wall of the cylinder body, a baffle plate is arranged on the axial direction of the outer surface of the output shaft between the front baffle wall and the rear baffle wall, one side surface of the baffle plate is in sealing contact with the inner wall of the cylinder body, a flow distribution block is arranged on the cylinder body, the lower part of the flow distribution block is arranged in the cylinder body and is positioned between the front baffle wall and the rear baffle wall, the bottom of the flow distribution block is in sealing contact with the outer surface of the output shaft, so that two oil cavities which are distributed along the circumference of the output shaft and are mutually independent are formed between the front baffle wall and the rear baffle wall in the cylinder body, and oil holes which are respectively communicated with the two oil cavities are arranged on the flow distribution block. The invention has the advantages of axial size saving, large output torque, large bearing load, compact structure, convenient disassembly and assembly and long service life.

Description

High-pressure swing hydraulic cylinder

Technical Field

The invention relates to the field of machinery, in particular to a high-pressure swing hydraulic cylinder.

Background

The swing type hydraulic cylinder can generate very strong torque by utilizing the pressure of hydraulic oil, and has very wide application scenes; the swing cylinder can realize accurate control while outputting large torque, has the characteristics of no fault, long period, high reliability, low maintenance frequency and the like, and has been successfully applied to the fields requiring limited rotational movement and large torque such as ships, spaceflight and the like. The traditional swing hydraulic cylinder consists of four main parts, namely a front end cover, a rear end cover, a cylinder body and an output shaft, and because the pressure of hydraulic oil acts on the front end cover and the rear end cover simultaneously, the sealing between the front end cover and the rear end cover and the cylinder body has very severe requirements, so that the working pressure of the swing hydraulic cylinder is generally not high; in addition, the swing hydraulic cylinder needs a larger acting area for outputting larger torque, so that the swing hydraulic cylinder with larger torque often has larger axial dimension, which limits the use field to a certain extent.

Disclosure of Invention

The invention aims to provide a high-pressure swing hydraulic cylinder to solve the defects in the prior art, and the technical problems to be solved by the invention are realized by the following technical scheme.

The utility model provides a high-pressure swing pneumatic cylinder, includes cylinder body and cylinder cap that mutually covers, cylinder body internally mounted has the output shaft, the output shaft respectively with the cylinder body with the cylinder cap rotates to be connected, the output shaft includes preceding retaining wall and the back retaining wall that mutual interval set up, preceding retaining wall with back retaining wall respectively with the sealed butt of inner wall of cylinder body, preceding retaining wall with be equipped with the baffle in the axial direction of the surface of the output shaft between the back retaining wall, the baffle keep away from one side surface of output shaft axis with sealed butt between the inner wall of cylinder body, be equipped with the distribution piece on the cylinder body, the lower part of distribution piece is arranged in the cylinder body and be located preceding retaining wall with between the back retaining wall, the bottom of distribution piece with form between the preceding retaining wall of cylinder body inside and the back retaining wall along the circumference distribution of output shaft and two oil pocket mutually independent, be equipped with respectively with two on the distribution piece oil pocket are linked together.

Preferably, the flow distribution block and the partition plate divide the interior of the cylinder body into an oil cavity I and an oil cavity II, the flow distribution block is respectively provided with an oil through hole I and an oil through hole II, the oil through hole I is communicated with the oil cavity II, and the oil through hole II is communicated with the oil cavity I.

Preferably, the output shaft is respectively connected with the cylinder body and the cylinder cover in a rotating way through bearings.

Preferably, a boss is arranged on the inner side of the cylinder cover, a groove I is arranged in the center of the boss, the bearing is arranged in the groove I, and the front end part of the output shaft is arranged in an inner ring of the bearing.

Preferably, the inside of cylinder body is equipped with the cavity, the rear end portion is equipped with the shoulder hole, the output shaft install in the cavity, and the rear end portion stretches out the shoulder hole, the cylinder body with bearing between the output shaft is located in the macropore of shoulder hole, just the rear side of bearing is equipped with the bearing seal.

Preferably, sealing rings are respectively arranged between the circumferential surfaces of the front retaining wall and the rear retaining wall and the inner wall of the cylinder body.

Preferably, a sealing strip is arranged between the surface of one side of the partition plate, which is far away from the axis of the output shaft, and the inner wall of the cylinder body.

Preferably, a sealing strip is arranged between the bottom of the flow distribution block and the outer surface of the output shaft.

Preferably, the bottom of the flow distribution block is provided with an arc part, the arc part is matched with the outer surface of the output shaft between the front retaining wall and the rear retaining wall, the arc part is provided with a groove II matched with the sealing strip, and the sealing strip is arranged in the groove II.

Preferably, a platform is arranged on the outer surface of the cylinder body, a mounting hole is formed in the platform, the flow distribution block is mounted in the mounting hole, and a sealing gasket is arranged between the flow distribution block and the platform.

In the invention, an output shaft is respectively connected with a cylinder cover and a cylinder body in a rotating way to form a revolute pair, and a key slot is arranged at the right end part of the output shaft and is used for connecting a load. The oil through holes I and II are used for respectively introducing or discharging hydraulic oil into the oil cavity II and the oil cavity I. When the hydraulic cylinder is used, high-pressure hydraulic oil enters the two oil cavities through the two oil through holes respectively, so that the hydraulic cylinder is in three states of outputting forward torque, outputting reverse torque and standing respectively.

The invention has the following beneficial effects:

1) The lower part of the flow distribution block and the partition plate divide the space between the front baffle wall and the rear baffle wall in the cylinder body into two oil cavities, and the acting force of hydraulic oil, the inner wall of the cylinder body and the partition plate can be increased by increasing the radial size of the cylinder body, so that the output torque of the hydraulic cylinder is improved, the axial space is saved, and the hydraulic cylinder is more suitable for application occasions with small axial space and large radial space;

2) The hydraulic cylinder only needs a cylinder body, a cylinder cover, a flow distribution block, an output shaft, a plurality of sealing elements and connecting elements, has few parts, is simple to assemble and disassemble, has low material cost and assembly cost, has a compact structure and saves axial space;

3) Through the arrangement of the front retaining wall and the rear retaining wall, the pressure of the high-pressure hydraulic oil does not directly act on the cylinder body and the cylinder cover, but acts on the front retaining wall and the rear retaining wall, and the acting forces of the high-pressure hydraulic oil on the front retaining wall and the rear retaining wall are equal in magnitude and opposite in direction and can offset each other, so that the hydraulic cylinder can output larger torque and bear larger load;

4) The high-pressure hydraulic oil can not form excessive pressure on the connecting piece between the cylinder body and the cylinder cover, so that the sealing requirement on the connecting part between the cylinder body and the cylinder cover is reduced, and the service life of the hydraulic cylinder is effectively prolonged.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

FIG. 3 is a schematic cross-sectional view of the present invention;

FIG. 4 is a schematic view of another angle cross-sectional structure of the present invention;

FIG. 5 is a schematic diagram of an exploded construction of the present invention;

the reference numerals in the drawings are in turn: 1. cylinder block, 11, cavity, 12, stepped hole, 13, platform, 14, mounting hole, 2, cylinder cap, 21, boss, 22, recess I,3, output shaft, 31, front baffle wall, 32, back baffle wall, 33, baffle, 34, oil pocket I,35, oil pocket II,36, keyway, 4, distributing block, 41, oil through hole I,42, oil through hole II,43, arc portion, 44, recess II,5, sealing washer, 6, bearing, 7, sealing strip, 8, shaft seal, 9, sealing gasket.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

In the present invention, the front-rear and left-right directions refer to the cylinder head 2 side as the front side with reference to fig. 3.

Referring to fig. 1 to 5, there is shown a high pressure swing cylinder, the improvement comprising: including cylinder body 1 and cylinder cap 2 that mutually lid was closed, cylinder body 1 internally mounted has output shaft 3, output shaft 3 respectively with cylinder body 1 with cylinder cap 2 rotates to be connected, output shaft 3 includes preceding retaining wall 31 and the back retaining wall 32 that mutual interval set up, preceding retaining wall 31 with the back retaining wall 32 respectively with the sealed butt of inner wall of cylinder body 1, be equipped with baffle 33 in the axial direction of the surface of output shaft 3 between preceding retaining wall 31 with the back retaining wall 32, baffle 33 is kept away from one side surface of output shaft 3 axis with seal the butt between the inner wall of cylinder body 1, be equipped with on the cylinder body 1 and join in marriage the flow block 4, join in marriage the lower part of flow block 4 and be arranged in cylinder body 1 and be located preceding retaining wall 31 with between the back retaining wall 32, join in marriage the flow block 4 the bottom with the sealed butt of output shaft 3 surface, so that form between the inside preceding retaining wall 31 of cylinder body 1 and the back retaining wall 32 along the circumference of output shaft 3 and mutually independent two join in marriage the oil pocket, be equipped with respectively with two oil through-holes communicate on the oil pocket.

Further, referring to fig. 3 and 4, the flow distribution block 4 and the partition 33 divide the interior of the cylinder 1 into an oil cavity I34 and an oil cavity II35, the flow distribution block 4 is provided with an oil through hole I41 and an oil through hole II42, respectively, the oil through hole I41 is communicated with the oil cavity II35, and the oil through hole II42 is communicated with the oil cavity I34.

In this embodiment, the output shaft 3 is rotatably connected to the cylinder head 2 and the cylinder body 1, respectively, to form a revolute pair, and a key groove 36 is provided at the right end portion of the output shaft 3 for connecting a load. The oil passage hole I41 and the oil passage hole II42 are used for introducing or discharging hydraulic oil into the oil chamber II35 and the oil chamber I34, respectively. When the hydraulic oil pump is used, high-pressure hydraulic oil respectively enters the two oil cavities through the two oil through holes, so that the hydraulic cylinder is respectively in three states of outputting forward torque, outputting reverse torque and standing, and the following three states are realized:

(1) forward torque: referring to fig. 4, high-pressure hydraulic oil is introduced into the oil chamber I34 from the oil passage hole II42 of the flow distribution block 4, and fills the oil chamber I34 with the high-pressure hydraulic oil, and at this time, the pressure of the high-pressure hydraulic oil acts on the left side of the partition 33 to cause the output shaft 3 to generate a counterclockwise output torque, thereby driving the load to swing counterclockwise, and at this time, the output torque is a forward torque, and the speed and the swing angle of the load are controlled by controlling the flow rate and the flow rate of the hydraulic oil; in addition, the output of forward torque can also be realized through respectively leading in the hydraulic oil of pressure inequality to oil pocket I34 and oil pocket II35, only need make baffle 33 left side pressure be greater than right side pressure can, when output shaft 3 reverse rotation, the hydraulic oil in the oil pocket II35 is constantly discharged outward from oil hole I41, and the pneumatic cylinder swings more steadily under this kind of mode, and swing speed and angle's controllability is stronger.

(2) Reverse torque: the high-pressure hydraulic oil is introduced into the oil cavity II35 from the oil through hole I41 of the flow distribution block 4, the oil cavity II35 is filled with the high-pressure hydraulic oil, at the moment, the pressure of the high-pressure hydraulic oil acts on the right side of the partition plate 33 to enable the output shaft 3 to generate clockwise output torque, so that the load is driven to swing clockwise, at the moment, the output torque is reverse torque, and the speed and the swing angle of the load are controlled by controlling the flow rate and the flow rate of the hydraulic oil; in addition, the output of reverse torque can also be realized through respectively leading in the hydraulic oil with unequal pressure to the oil cavity I34 and the oil cavity II35, only the right side pressure of the baffle plate 33 is required to be larger than the left side pressure, and the hydraulic oil in the oil cavity I34 is continuously discharged outwards from the oil through hole II42 when the output shaft 3 rotates clockwise, so that the hydraulic cylinder swings more stably under the mode, and the swinging speed and the angle are more controllable:

(3) stationary state: hydraulic oil with equal pressure is respectively introduced into the oil chamber II35 and the oil chamber I34 through the oil through holes I41 and the oil through holes II42, and the oil chamber II35 and the oil chamber I34 are respectively filled, at this time, the pressures acting on the left side and the right side of the partition plate 33 are equal, and the hydraulic cylinder is in a static state.

According to the high-pressure swing hydraulic cylinder provided by the embodiment, the lower part of the flow distribution block 4 and the partition plate 33 divide the space between the front baffle wall 31 and the rear baffle wall 32 in the cylinder body 1 into two oil cavities, and the acting force of hydraulic oil, the inner wall of the cylinder body and the partition plate 33 can be increased by increasing the radial size of the cylinder body, so that the output torque of the hydraulic cylinder is improved, the axial space is saved, and the high-pressure swing hydraulic cylinder is more suitable for application occasions with small axial space and large radial space; the hydraulic cylinder only needs a cylinder body, a cylinder cover, a flow distribution block, an output shaft, a plurality of sealing elements and connecting elements, has few parts, is simple to assemble and disassemble, has low material cost and assembly cost, has a compact structure and saves axial space; through the arrangement of the front retaining wall and the rear retaining wall, the pressure of the high-pressure hydraulic oil does not directly act on the cylinder body and the cylinder cover, but acts on the front retaining wall and the rear retaining wall, and the acting forces of the high-pressure hydraulic oil on the front retaining wall and the rear retaining wall are equal in magnitude and opposite in direction and can offset each other, so that the hydraulic cylinder can output larger torque and bear larger load; in addition, the high-pressure hydraulic oil can not form excessive pressure to the connecting piece between the cylinder body and the cylinder cover, so that the sealing requirement on the connecting part between the cylinder body and the cylinder cover is reduced, and the service life of the hydraulic cylinder is effectively prolonged.

Further, the output shaft 3 is rotatably connected with the cylinder body 1 and the cylinder cover 2 through bearings 6 respectively.

Further, a boss 21 is provided on the inner side of the cylinder cover 2, a groove I22 is provided in the center of the boss 21, the bearing 6 is mounted in the groove I22, and the front end of the output shaft 3 is mounted in the inner ring of the bearing 6.

Further, a chamber 11 is arranged in the cylinder body 1, a stepped hole 12 is formed in the rear end portion of the cylinder body 1, the output shaft 3 is installed in the chamber 11, the rear end portion of the output shaft extends out of the stepped hole 12, a bearing 6 between the cylinder body 1 and the output shaft 3 is arranged in a large hole of the stepped hole 12, and a shaft seal 8 is arranged on the rear side of the bearing 6.

Further, sealing rings 5 are respectively provided between the circumferential surfaces of the front blocking wall 31 and the rear blocking wall 32 and the inner wall of the cylinder 1. The arrangement of the sealing ring 5 can seal hydraulic oil in the oil cavity, so that pollution caused by leakage of hydraulic oil into other spaces in the cylinder body 1 and uncontrollable pressure are avoided, and normal use of the hydraulic cylinder is prevented; in addition, the direct action of the pressure of hydraulic oil on the cylinder cover 2 and the cylinder body 1 is avoided, and the service life of the hydraulic cylinder is shortened.

Further, a sealing strip 7 is provided between a surface of the partition 33, which is away from the axis of the output shaft 3, and the inner wall of the cylinder 1.

Further, a sealing strip 7 is arranged between the bottom of the flow distribution block 4 and the outer surface of the output shaft 3.

Further, an arc part 43 is arranged at the bottom of the flow distribution block 4, the arc part 43 is matched with the outer surface of the output shaft 3 between the front baffle wall 31 and the rear baffle wall 32, a groove II44 matched with the sealing strip 7 is arranged on the arc part 43, and the sealing strip 7 is arranged in the groove II 44.

In this embodiment, the arrangement of the circular arc portion 43 makes the output shaft 3 and the bottom of the flow distribution block 4 more fit, so that the rotation of the output shaft 3 relative to the bottom of the flow distribution block 4 is smoother, and the sealing strip 7 is arranged on the circular arc portion, so that the sealing performance of the oil cavity I34 and the oil cavity II35 is better, and the output torque of the hydraulic cylinder is more accurate and controllable.

Further, a platform 13 is arranged on the outer surface of the cylinder body 1, a mounting hole 14 is arranged on the platform 13, the flow distribution block 4 is mounted in the mounting hole 14, and a sealing gasket 9 is arranged between the flow distribution block 4 and the platform 13. The platform 13 is arranged, so that the installation of the flow distribution block 4 is facilitated; the sealing gasket 9 prevents the hydraulic oil in the oil through hole from leaking to influence the use of the hydraulic cylinder.

It should be noted that the foregoing detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly indicates otherwise. Furthermore, it will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components, and/or groups thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or otherwise described herein.

Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways, such as rotated 90 degrees or at other orientations, and the spatially relative descriptors used herein interpreted accordingly.

In the above detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, like numerals typically identify like components unless context indicates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high pressure swing hydraulic cylinder, characterized by: the novel oil cylinder comprises a cylinder body (1) and a cylinder cover (2) which are mutually covered, wherein an output shaft (3) is arranged in the cylinder body (1), the output shaft (3) is respectively connected with the cylinder body (1) and the cylinder cover (2) in a rotating mode, the output shaft (3) comprises a front retaining wall (31) and a rear retaining wall (32) which are mutually arranged at intervals, the front retaining wall (31) and the rear retaining wall (32) are respectively in sealing butt with the inner wall of the cylinder body (1), and sealing rings (5) are respectively arranged between the circumferential surfaces of the front retaining wall (31) and the rear retaining wall (32) and the inner wall of the cylinder body (1); a baffle plate (33) is arranged on the axial direction of the outer surface of the output shaft (3) between the front baffle wall (31) and the rear baffle wall (32), one side surface of the baffle plate (33) away from the axis of the output shaft (3) is in sealing abutting joint with the inner wall of the cylinder body (1), and a sealing strip (7) is arranged between one side surface of the baffle plate (33) away from the axis of the output shaft (3) and the inner wall of the cylinder body (1); a flow distribution block (4) is arranged on the cylinder body (1),

the lower part of the flow distribution block (4) is arranged in the cylinder body (1) and is positioned between the front baffle wall (31) and the rear baffle wall (32), the bottom of the flow distribution block (4) is in sealing abutting joint with the outer surface of the output shaft (3), so that two oil cavities which are distributed along the circumference of the output shaft (3) and are mutually independent are formed between the front baffle wall (31) and the rear baffle wall (32) in the cylinder body (1), and a sealing strip (7) is arranged between the bottom of the flow distribution block (4) and the outer surface of the output shaft (3); the bottom of the flow distribution block (4) is provided with an arc part (43), the arc part (43) is matched with the outer surface of the output shaft (3) between the front baffle wall (31) and the rear baffle wall (32), the arc part (43) is provided with a groove II (44) matched with the sealing strip (7), and the sealing strip (7) is arranged in the groove II (44); the flow distribution block (4) is provided with oil holes which are respectively communicated with the two oil cavities.

2. A high pressure swing cylinder according to claim 1, wherein: the cylinder body is characterized in that the flow distribution block (4) and the partition plate (33) divide the interior of the cylinder body (1) into an oil cavity I (34) and an oil cavity II (35), oil holes I (41) and II (42) are respectively formed in the flow distribution block (4), the oil holes I (41) are communicated with the oil cavity II (35), and the oil holes II (42) are communicated with the oil cavity I (34).

3. A high pressure swing cylinder according to claim 1, wherein: the output shaft (3) is respectively connected with the cylinder body (1) and the cylinder cover (2) in a rotating way through bearings (6).

4. A high pressure swing cylinder according to claim 3, wherein: the inner side of the cylinder cover (2) is provided with a boss (21), the center of the boss (21) is provided with a groove I (22), the bearing (6) is installed in the groove I (22), and the front end part of the output shaft (3) is installed in the inner ring of the bearing (6).

5. A high pressure swing cylinder according to claim 1, wherein: the inside of cylinder body (1) is equipped with cavity (11), rear end portion are equipped with shoulder hole (12), output shaft (3) install in cavity (11), and rear end portion stretches out shoulder hole (12), cylinder body (1) with bearing (6) between output shaft (3) are located in the macropore of shoulder hole (12), just the rear side of bearing (6) is equipped with bearing seal (8).

6. A high pressure swing cylinder according to claim 1, wherein: the outer surface of cylinder body (1) is equipped with platform (13), be equipped with mounting hole (14) on platform (13), join in marriage flow block (4) install in mounting hole (14), join in marriage flow block (4) with be equipped with sealed pad (9) between platform (13).