CN116379034A - Spiral swing hydraulic cylinder - Google Patents

Spiral swing hydraulic cylinder Download PDF

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Publication number
CN116379034A
CN116379034A CN202211682795.XA CN202211682795A CN116379034A CN 116379034 A CN116379034 A CN 116379034A CN 202211682795 A CN202211682795 A CN 202211682795A CN 116379034 A CN116379034 A CN 116379034A
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CN
China
Prior art keywords
sleeve
cylinder
cylinder body
rotating shaft
output rotating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211682795.XA
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Chinese (zh)
Inventor
喻卫宁
张昊
郑超
丰星星
兰年山
刘冰
曹和云
关夏威
刘顶峰
吴涛
张安付
王翰
张满弓
吴刚
黄怡苍
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719th Research Institute of CSIC
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719th Research Institute of CSIC
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Application filed by 719th Research Institute of CSIC filed Critical 719th Research Institute of CSIC
Priority to CN202211682795.XA priority Critical patent/CN116379034A/en
Publication of CN116379034A publication Critical patent/CN116379034A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/04—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member with oscillating cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
    • F15B15/068—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the helical type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

The invention provides a spiral swing hydraulic cylinder which comprises a cylinder body, an output rotating shaft, a cylinder cover, a piston and a first sleeve, wherein the first sleeve is positioned in the cylinder cover and is fixedly connected with the cylinder body, and a first channel and a second channel are formed in the first sleeve along the radial direction of the first sleeve; the side wall of the cylinder cover is provided with a first oil port and a second oil port which are communicated with the first channel and the second channel; the output rotating shaft is internally provided with a first oil duct and a second oil duct which are symmetrical relative to the axis of the output rotating shaft, one end of the first oil duct, which is positioned in the first sleeve, is connected with the first channel, and one end of the second oil duct, which is positioned in the first sleeve, is connected with the second channel. The invention adopts the internal oil duct of the spiral swing hydraulic cylinder and the rotary seal, so that the oil duct is directly connected to the two ends of the joint through the spiral swing hydraulic cylinder, thus the oil supply is carried out for a hydraulic user at the far end of the swing joint of the manipulator or the mechanical arm without a hose, and the problem of winding of the hydraulic oil hose along with the swing joint is avoided.

Description

Spiral swing hydraulic cylinder
Technical Field
The invention relates to the technical field of hydraulic cylinders, in particular to a spiral swing hydraulic cylinder.
Background
At present, the hydraulic cylinder has the function of converting hydraulic energy into mechanical energy in a hydraulic system, so that the machine realizes reciprocating motion or swinging motion. The transfer of torque and tilt angle through a hydraulic ram is one of the methods of converting a fluid input with energy into a torque and tilt angle output.
For example, chinese patent No. CN111173801B discloses a swinging hydraulic cylinder, which adopts a spiral swinging hydraulic cylinder mode. Because the spiral swing hydraulic cylinder is small in size and compact in structure, the spiral swing hydraulic cylinder is widely applied to many engineering equipment such as ships, particularly the swing joint of a manipulator or a mechanical arm is subjected to swing motion by adopting the spiral swing hydraulic cylinder, when a hydraulic user is arranged at the far end of the swing joint, in order to ensure the mobility of the joint, the current equipment is mostly connected through a hydraulic oil hose, the larger the swing angle is, the longer the length of the hydraulic oil hose is, the more easily winding and friction are generated, the use safety of the equipment is affected, and when the swing angle is close to or exceeds 360 degrees, the connection of the hydraulic oil hose is almost impossible.
Disclosure of Invention
In view of this, the present invention proposes a spiral swing hydraulic cylinder to solve the problem that when the swing joint of the manipulator or the mechanical arm is connected by using the existing spiral swing hydraulic cylinder and the remote end of the swing joint of the manipulator or the mechanical arm has a hydraulic user, a hydraulic oil hose must be used to swing along with the joint in order to ensure the mobility of the joint, and when the swing angle is close to or exceeds 360 °, the hydraulic oil hose is difficult to meet the requirement.
The technical scheme of the invention is realized as follows:
the invention provides a spiral swing hydraulic cylinder which comprises a cylinder body, an output rotating shaft, a cylinder cover and a piston, wherein the cylinder body is provided with a cylinder cover; wherein,,
the cylinder body is internally provided with a cavity extending along the axial direction of the cylinder body;
at least one part of the output rotating shaft is arranged in the cavity and extends along the axial direction of the cavity;
the cylinder cover is fixedly arranged at one end of the cylinder body in the axial direction and is connected with one end of the output rotating shaft extending into the cavity;
the piston is positioned in the cavity and sleeved on the periphery of the output rotating shaft, a first spiral pair is formed between the outer peripheral wall of the piston and the inner peripheral wall of the cavity, and a second spiral pair with opposite rotating directions is formed between the inner peripheral wall of the piston and the outer peripheral wall of the output rotating shaft;
the cylinder cover is characterized by further comprising a first sleeve, wherein the first sleeve is positioned in the cylinder cover and is fixedly connected with the cylinder body, a first channel and a second channel are formed in the first sleeve along the radial direction of the first sleeve, the first channel and the second channel are arranged at intervals in the axial direction of the first sleeve, and a first annular groove communicated with the first channel and a second annular groove communicated with the second channel are respectively formed in the outer peripheral wall and the inner peripheral ring of the first sleeve;
the side wall of the cylinder cover is provided with a first oil port and a second oil port which are communicated with the first channel and the second channel;
the output rotating shaft penetrates through the first sleeve, a first oil duct and a second oil duct which are symmetrical relative to the axis of the output rotating shaft are arranged in the output rotating shaft, one end of the first oil duct, which is positioned in the first sleeve, is connected with a first annular groove of the inner peripheral ring of the first sleeve, and one end of the second oil duct, which is positioned in the first sleeve, is connected with a second annular groove of the inner peripheral wall of the first sleeve.
On the basis of the technical scheme, the novel rotary power generation device comprises a cylinder body, a first sleeve, a second sleeve, an output rotating shaft, a first sleeve and a second sleeve, wherein the second sleeve is inserted into one end of the cavity far away from the cylinder cover and is fixedly connected with the cylinder body, the output rotating shaft penetrates through the second sleeve and is in dynamic sealing connection with the second sleeve, and one end of the first sleeve far away from the cylinder cover is inserted into the cavity and is fixedly connected with the cylinder body.
Further, preferably, the piston divides the cavity enclosed by the cylinder body, the first sleeve, the output rotating shaft and the second sleeve into a first liquid inlet cavity and a second liquid inlet cavity, a first oil hole and a second oil hole are formed in the side wall of the cylinder body, the first oil hole is communicated with the first liquid inlet cavity, and the second oil hole is communicated with the second liquid inlet cavity.
On the basis of the technical scheme, preferably, the piston is provided with a cylindrical part and a cylinder body integrally connected with the cylindrical part, the output rotating shaft is provided with a first shaft section and a second shaft section integrally connected with the second shaft section, the diameter of the second shaft section is larger than that of the first shaft section, at least a part of the first shaft section is positioned in the first sleeve and the cavity, the cylindrical part is sleeved on the first shaft section and is in dynamic sealing connection with the first shaft section, the cylinder body is sleeved on the second shaft section, a first screw pair is formed between the outer peripheral wall of the cylinder body and the inner peripheral wall of the cavity, and a second screw pair with opposite rotating directions is formed between the inner peripheral wall of the cylinder body and the outer peripheral wall of the second shaft section.
Further, preferably, the outer circumferential wall of the cylinder is provided with a first internal thread spline along the axial direction thereof, the inner circumferential wall of one end of the cylinder, which is far away from the cylindrical portion, is provided with a second external thread spline along the axial direction thereof, the inner circumferential wall of the cavity is provided with a first external thread spline which is matched with the first internal thread spline along the axial direction thereof, the outer circumferential wall of the second shaft section is provided with a second internal thread spline which is matched with the second external thread spline along the axial direction thereof, the axial length of the first external thread spline is smaller than that of the first internal thread spline, and the axial length of the second external thread spline is smaller than that of the second internal thread spline.
Preferably, a first bearing is rotatably arranged between the first sleeve and the first shaft section, and a second bearing is rotatably arranged between the second sleeve and the second shaft section.
Preferably, a plurality of sealing elements are arranged between the first sleeve and the inner peripheral wall of the cylinder cover and between the first sleeve and the output rotating shaft.
Preferably, a rotary encoder is further arranged between the cylinder cover and the output rotating shaft.
Preferably, the first sleeve is provided with a plurality of first oil channels on the same plane in the radial direction, and the first sleeve is provided with a plurality of second oil channels on the same plane in the radial direction.
Preferably, one end of the cylinder body far away from the cylinder cover is provided with a first flange, and one end of the output rotating shaft outside the cavity is provided with a second flange
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention discloses a spiral swing hydraulic cylinder, which is characterized in that a first sleeve is fixedly arranged between a cylinder body and a cylinder cover, an output rotating shaft penetrates through the first sleeve, a first channel and a second channel are arranged in the radial direction of the first sleeve, meanwhile, the first channel and the second channel are arranged at intervals in the axial direction of the first sleeve, a first annular groove communicated with the first channel and a second annular groove communicated with the second channel are respectively arranged on the outer peripheral wall and the inner peripheral ring of the first sleeve, a first oil port and a second oil port communicated with the first channel and the second channel are arranged on the side wall of the cylinder cover, a first oil duct and a second oil duct which are symmetrical relative to the axes of the first oil duct and the second oil duct are arranged in the output rotating shaft, one end of the first oil passage is positioned in the first sleeve and connected with a first annular groove of the inner peripheral ring of the first sleeve, and one end of the second oil passage is positioned in the first sleeve and connected with a second annular groove of the inner peripheral wall of the first sleeve, so that a first oil port, a first passage, the first annular groove and the first oil passage form a communicated oil passage, and meanwhile, a second oil port, a second passage, a second annular groove and the second oil passage form a communicated oil passage;
(2) By arranging the first screw pair, when the piston receives hydraulic oil thrust in the cavity, the piston rotates relative to the cylinder body, and by enabling the axial length of the first external thread spline to be smaller than that of the first internal thread spline, the contact friction of the piston when the piston translates relative to the cylinder body can be reduced, and the rotation output torque of the piston is increased; by arranging the second screw pair, the piston can drive the output rotating shaft to rotate in the translation and rotation processes, and by enabling the axial length of the second external thread spline to be smaller than that of the second internal thread spline, the contact friction of the piston relative to the output rotating shaft in translation can be reduced, and the rotation output torque of the output rotating shaft is increased;
(3) The rotary encoder is arranged between the cylinder cover and the output rotating shaft, so that the rotating angle of the output rotating shaft can be accurately controlled, and the precision of the swinging angle of the swinging joint of the manipulator or the mechanical arm is improved;
(4) The first sleeve is provided with a plurality of first oil ducts on the same plane in the radial direction, and the first sleeve is provided with a plurality of second oil ducts on the same plane in the radial direction, so that the oil passing quantity of the first oil ducts and the second oil ducts can be increased, and the oil supply requirement of a hydraulic user at the far end of the swing joint of the mechanical arm or the mechanical arm is met.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a structure of a helical oscillating hydraulic cylinder according to the present disclosure;
FIG. 2 is a schematic plan view of a helical oscillating hydraulic cylinder according to the present disclosure;
reference numerals:
1. a cylinder; 2. an output shaft; 3. a cylinder cover; 4. a piston; 11. a chamber; 41. a first screw pair; 42. a second screw pair; 5. a first sleeve; 51. a first channel; 52. a second channel; 53. a first annular groove; 54. a second annular groove; 31. a first oil port; 32. a second oil port; 201. a first oil passage; 202. a second oil passage; 6. a second sleeve; 111. a first liquid inlet chamber; 112. a second liquid inlet cavity; 12. a first oil hole; 13. a second oil hole; 43. a columnar portion; 44. a cylinder; 21. a first shaft section; 22. a second shaft section; 411. a first internal thread spline; 412. a first external thread spline; 421. a second external thread spline; 422. a second internal thread spline; s1, a first bearing; s2, a second bearing; o, a sealing member; 7. a rotary encoder; 14. a first flange; 23. and a second flange.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
As shown in fig. 1, in combination with fig. 2, an embodiment of the present invention discloses a spiral swing hydraulic cylinder, which includes a cylinder body 1, an output rotary shaft 2, a cylinder cover 3 and a piston 4.
The cylinder body 1, which is a whole screw swing cylinder carrier, defines a chamber 11 extending in the axial direction thereof, and the chamber 11 has a circular cross section and rotates in cooperation with the piston 4 and the output shaft 2.
At least a part of the output rotating shaft 2 is arranged in the chamber 11 and extends along the axial direction of the chamber 11, and one end of the output rotating shaft 2 positioned outside the chamber 11 is used for being connected with a manipulator or a swinging joint of the manipulator.
The cylinder cover 3 is fixedly arranged at one end of the cylinder body 1 in the axial direction and is connected with one end of the output rotating shaft 2 extending into the cavity 11, and is used for closing one end of the cavity 11 and limiting at least one part of the output rotating shaft 2 in the cavity 11.
The piston 4 is located in the chamber 11 and sleeved on the outer periphery of the output rotating shaft 2, a first screw pair 41 is formed between the outer peripheral wall of the piston 4 and the inner peripheral wall of the chamber 11, and a second screw pair 42 with opposite rotation directions is formed between the inner peripheral wall of the piston 4 and the outer peripheral wall of the output rotating shaft 2.
In this embodiment, the piston 4 divides the chamber 11 into a first liquid inlet cavity 111 and a second liquid inlet cavity 112, a first oil hole 12 and a second oil hole 13 are formed in the side wall of the cylinder 1, the first oil hole 12 is communicated with the first liquid inlet cavity 111, and the second oil hole 13 is communicated with the second liquid inlet cavity 112.
Thus, hydraulic oil can be respectively introduced into the first liquid inlet cavity 111 and the second liquid inlet cavity 112 through the first oil hole 12 and the second oil hole 13, the piston 4 reciprocates along the axial direction of the cavity 11 under the action of pressure oil in the first liquid inlet cavity 111 and the second liquid inlet cavity 112, and the second screw pair 42 and the first screw pair 41 are mutually matched to convert the axial movement of the piston 4 into circumferential rotation of the output rotating shaft 2. The rotation of the output rotating shaft 2 can drive the mechanical arm or the mechanical arm swing joint to swing angularly.
In the prior art, when the far end of a swinging joint of some mechanical arms or mechanical arms is provided with a hydraulic user, in order to ensure the mobility of the joint, most of the current equipment is connected through a hydraulic oil hose, the larger the swinging angle is, the longer the length of the hydraulic oil hose is, the more easily the winding and friction are generated, the safety of the equipment is affected, and when the swinging angle is close to or exceeds 360 degrees, the connection of the hydraulic oil hose is almost impossible.
In order to solve the technical problems, the invention adopts the following scheme.
The invention is provided with the first sleeve 5, the first sleeve 5 is positioned in the cylinder cover 3 and is fixedly connected with the cylinder body 1, as a certain preferred embodiment, one surface of the cylinder cover 3 facing the cylinder body 1 is provided with a cylinder cavity for installing the first sleeve 5, the first sleeve 5 is in sealing connection with the cylinder cover 3, one end of the first sleeve 5 far away from the cylinder cover 3 is inserted into the cavity 11 and is fixedly connected with the cylinder body 1, therefore, one end of the cavity 11 can be sealed through the first sleeve 5, in the embodiment, the first sleeve 5 can be in threaded connection with the cavity 11, and the cylinder cover 3 and the cylinder body 1 are connected through bolts, so that the whole hydraulic cylinder is convenient to assemble, and meanwhile, sealing connection can be realized after the hydraulic cylinder is assembled.
The first sleeve 5 is provided with a first channel 51 and a second channel 52 along the radial direction, the first channel 51 and the second channel 52 are arranged at intervals in the axial direction of the first sleeve 5, and the outer peripheral wall and the inner peripheral ring of the first sleeve 5 are respectively provided with a first annular groove 53 communicated with the first channel 51 and a second annular groove 54 communicated with the second channel 52.
The side wall of the cylinder cover 3 is provided with a first oil port 31 and a second oil port 32 which are communicated with a first channel 51 and a second channel 52.
Thus, hydraulic oil is introduced through the first oil port 31, the hydraulic oil firstly enters the first annular groove 53 on the outer peripheral wall of the first sleeve 5, then enters the first annular groove 53 on the inner peripheral wall of the first sleeve 5 through the first channel 51, and similarly, the hydraulic oil is introduced through the second oil port 32, the hydraulic oil firstly enters the second annular groove 54 on the outer peripheral wall of the first sleeve 5, and then enters the second annular groove 54 on the inner peripheral wall of the first sleeve 5 through the second channel 52.
The output rotating shaft 2 passes through the first sleeve 5, a first oil duct 201 and a second oil duct 202 which are symmetrical relative to the axis of the output rotating shaft 2 are arranged in the output rotating shaft 2, one end of the first oil duct 201 positioned in the first sleeve 5 is connected with a first annular groove 53 of the inner peripheral ring of the first sleeve 5, and one end of the second oil duct 202 positioned in the first sleeve 5 is connected with a second annular groove 54 of the inner peripheral wall of the first sleeve 5.
The one end that first oil duct 201 kept away from first sleeve 5 is used for being connected with the hydraulic pressure user oil inlet of swing joint distal end, and the one end that second oil duct 202 kept away from first sleeve 5 is used for being connected with the hydraulic pressure user oil return opening of swing joint distal end, because output pivot 2 is rotatory in cylinder body 1, hydraulic oil can be in the first ring channel 53 on the first sleeve 5 inner peripheral wall can be when output pivot 2 rotates arbitrary angle all the time in first oil duct 201, and similarly, hydraulic oil can be in the second ring channel 54 on the first sleeve 5 inner peripheral wall can be when output pivot 2 rotates arbitrary angle all the time in the second oil duct 202. The first oil port 31, the first channel 51, the first annular groove 53 and the first oil channel 201 form a communicated oil channel, meanwhile, the second oil port 32, the second channel 52, the second annular groove 54 and the second oil channel 202 form a communicated oil channel, hydraulic oil in the oil channel can still ensure the oil supply of a hydraulic user at the far end of the swing joint when the mechanical arm or the swing joint swings at any angle, a hydraulic oil hose does not need to be arranged, and the problem of winding of the hydraulic oil hose when the hydraulic oil hose swings along with the swing joint is avoided.
In order to realize that the output rotating shaft 2 is sealed at one end of the cylinder body 1 far away from the cylinder cover 3 and the cavity 11, the embodiment is further provided with a second sleeve 6, the second sleeve 6 is inserted into one end of the cavity 11 far away from the cylinder cover 3 and is fixedly connected with the cylinder body 1, and the output rotating shaft 2 passes through the second sleeve 6 and is in dynamic sealing connection with the second sleeve 6. Therefore, when the cylinder is assembled, the second sleeve 6 is sleeved on the output rotating shaft 2 to be connected in a dynamic sealing mode, and then the second sleeve 6 is communicated with the output rotating shaft 2 to be inserted into the cavity 11 along one end, far away from the cylinder cover 3, of the cylinder body 1 and is in threaded connection with the cavity 11. Then, the first sleeve 5 is sleeved at one end of the output rotating shaft 2 far away from the second sleeve 6 for dynamic sealing connection, then the first sleeve 5 is in spiral connection with the inner wall of the cavity 11, and finally the cylinder cover 3 is sleeved on the first sleeve 5 and is in bolt connection with the cylinder body 1, so that the assembly of the spiral swing hydraulic cylinder in the embodiment is completed.
In order to enable axial translation and circumferential rotation between the piston 4 and the output shaft 2, the piston 4 is provided with a cylindrical portion 43 and a cylinder 44 integrally connected with the cylindrical portion 43, the output shaft 2 is provided with a first shaft section 21 and a second shaft section 22 integrally connected with the second shaft section 22, the diameter of the second shaft section 22 is larger than that of the first shaft section 21, at least a part of the first shaft section 21 is positioned in the first sleeve 5 and the chamber 11, and the second sleeve 6 is sleeved on the second shaft section 22. The cylindrical portion 43 is sleeved on the first shaft section 21 and is in dynamic sealing connection with the first shaft section 21, the cylinder 44 is sleeved on the second shaft section 22, a first screw pair 41 is formed between the outer peripheral wall of the cylinder 44 and the inner peripheral wall of the chamber 11, and a second screw pair 42 with opposite rotation directions is formed between the inner peripheral wall of the cylinder 44 and the outer peripheral wall of the second shaft section 22.
As some preferred embodiments, the outer peripheral wall of the cylinder 44 is provided with a first internal thread spline 411 along the axial direction thereof, the inner peripheral wall of one end of the cylinder 44 far away from the cylindrical portion 43 is provided with a second external thread spline 421 along the axial direction thereof, the inner peripheral wall of the chamber 11 is provided with a first external thread spline 412 which is matched with the first internal thread spline 411 along the axial direction thereof, the outer peripheral wall of the second shaft section 22 is provided with a second internal thread spline 422 which is matched with the second external thread spline 421 along the axial direction thereof, the axial length of the first external thread spline 412 is smaller than the axial length of the first internal thread spline 411, and the axial length of the second external thread spline 421 is smaller than the axial length of the second internal thread spline 422.
By adopting the technical scheme, through arranging the first screw pair 41, when the piston 4 receives hydraulic oil thrust in the chamber 11, the piston 4 rotates relative to the cylinder body 1, and through enabling the axial length of the first external thread spline 412 to be smaller than that of the first internal thread spline 411, the contact friction of the piston 4 when translating relative to the cylinder body 1 can be reduced, and the rotation output torque of the piston 4 is increased; by arranging the second screw pair 42, the piston 4 can drive the output rotating shaft 2 to rotate in the translation and rotation process, and by enabling the axial length of the second external thread spline 421 to be smaller than that of the second internal thread spline 422, the contact friction of the piston 4 in translation relative to the output rotating shaft 2 can be reduced, and the rotation output torque of the output rotating shaft 2 can be increased.
In order to achieve a dynamic sealing connection between the first sleeve 5, the second sleeve 6 and the output shaft 2, a first bearing S1 is rotatably arranged between the first sleeve 5 and the first shaft section 21, and a second bearing S2 is rotatably arranged between the second sleeve 6 and the second shaft section 22. By the arrangement, the output rotating shaft 2 can rotate more smoothly through the arrangement of the first bearing S1 and the second bearing S2, and abrasion of a dynamic sealing material is reduced.
Preferably, a plurality of sealing elements O are disposed between the first sleeve 5 and the inner peripheral wall of the cylinder cover 3 and between the output shaft 2, so that leakage of hydraulic oil in the first annular groove 53 and the second annular groove 54 to the joint can be avoided, and sealing performance among the first sleeve 5, the cylinder cover 3 and the output shaft 2 is improved.
In the present embodiment, a rotary encoder 7 is further provided between the cylinder head 3 and the output rotary shaft 2. By the arrangement, the rotation angle of the output rotating shaft 2 can be accurately controlled, and the precision of the swing angle of the swing joint of the manipulator or the mechanical arm is improved.
As some preferred embodiments, the first sleeve 5 is provided with the plurality of first oil channels 201 on the same plane in the radial direction, and the first sleeve 5 is provided with the plurality of second oil channels 202 on the same plane in the radial direction, so that the oil passing amount of the first oil channels 201 and the second oil channels 202 can be increased, and the oil supply requirement of a hydraulic user at the far end of the swing joint of the mechanical arm or the mechanical arm can be met.
Preferably, one end of the cylinder body 1 far away from the cylinder cover 3 is provided with a first flange 14, the cylinder body 1 can be fixed on the stationary equipment main body through the first flange 14, one end of the output rotating shaft 2 located outside the cavity 11 is provided with a second flange 23, and the second flange 23 is fixedly connected with a mechanical arm or a swinging joint on the mechanical arm.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. A spiral swing hydraulic cylinder comprises a cylinder body (1), an output rotating shaft (2), a cylinder cover (3) and a piston (4); wherein,,
the cylinder body (1) is internally provided with a cavity (11) extending along the axial direction of the cylinder body;
at least one part of the output rotating shaft (2) is arranged in the cavity (11) and extends along the axial direction of the cavity (11);
the cylinder cover (3) is fixedly arranged at one end of the cylinder body (1) in the axial direction and is connected with one end of the output rotating shaft (2) extending into the cavity (11);
the piston (4) is positioned in the cavity (11) and sleeved on the outer periphery of the output rotating shaft (2), a first spiral pair (41) is formed between the outer peripheral wall of the piston (4) and the inner peripheral wall of the cavity (11), and a second spiral pair (42) with opposite rotation directions is formed between the inner peripheral wall of the piston (4) and the outer peripheral wall of the output rotating shaft (2);
the method is characterized in that: the cylinder cover is characterized by further comprising a first sleeve (5), wherein the first sleeve (5) is positioned in the cylinder cover (3) and is fixedly connected with the cylinder body (1), a first channel (51) and a second channel (52) are formed in the first sleeve (5) along the radial direction of the first sleeve, the first channel (51) and the second channel (52) are arranged at intervals in the axial direction of the first sleeve (5), and a first annular groove (53) communicated with the first channel (51) and a second annular groove (54) communicated with the second channel (52) are formed in the outer peripheral wall and the inner peripheral ring of the first sleeve (5) respectively;
a first oil port (31) and a second oil port (32) which are communicated with the first channel (51) and the second channel (52) are formed in the side wall of the cylinder cover (3);
the output rotating shaft (2) passes through the first sleeve (5), a first oil duct (201) and a second oil duct (202) which are symmetrical relative to the axis of the output rotating shaft (2) are arranged in the output rotating shaft (2), one end of the first oil duct (201) positioned in the first sleeve (5) is connected with a first annular groove (53) of the inner peripheral ring of the first sleeve (5), and one end of the second oil duct (202) positioned in the first sleeve (5) is connected with a second annular groove (54) of the inner peripheral wall of the first sleeve (5).
2. The helical oscillating hydraulic cylinder of claim 1, wherein: the novel cylinder cover is characterized by further comprising a second sleeve (6), wherein the second sleeve (6) is inserted into one end, far away from the cylinder cover (3), of the cavity (11) and is fixedly connected with the cylinder body (1), the output rotating shaft (2) penetrates through the second sleeve (6) and is in dynamic sealing connection with the second sleeve, and one end, far away from the cylinder cover (3), of the first sleeve (5) is inserted into the cavity (11) and is fixedly connected with the cylinder body (1).
3. The helical oscillating hydraulic cylinder of claim 2, wherein: the piston (4) is used for dividing the cavity (11) formed by the cylinder body (1), the first sleeve (5), the output rotating shaft (2) and the second sleeve (6) into a first liquid inlet cavity (111) and a second liquid inlet cavity (112), a first oil hole (12) and a second oil hole (13) are formed in the side wall of the cylinder body (1), the first oil hole (12) is communicated with the first liquid inlet cavity (111), and the second oil hole (13) is communicated with the second liquid inlet cavity (112).
4. The helical oscillating hydraulic cylinder of claim 1, wherein: the piston (4) is provided with a cylindrical part (43) and a cylinder body (44) integrally connected with the cylindrical part (43), the output rotating shaft (2) is provided with a first shaft section (21) and a second shaft section (22) integrally connected with the first shaft section (21), the diameter of the second shaft section (22) is larger than that of the first shaft section (21), at least one part of the first shaft section (21) is positioned in the first sleeve (5) and the cavity (11), the cylindrical part (43) is sleeved on the first shaft section (21) and is in dynamic sealing connection with the first shaft section (21), the cylinder body (44) is sleeved on the second shaft section (22), a first spiral pair (41) is formed between the outer peripheral wall of the cylinder body (44) and the inner peripheral wall of the cavity (11), and a second spiral pair (42) with opposite rotating directions is formed between the inner peripheral wall of the cylinder body (44) and the outer peripheral wall of the second shaft section (22).
5. The helical oscillating hydraulic cylinder of claim 4, wherein: the outer peripheral wall of the cylinder body (44) is provided with a first internal thread spline (411) along the axial direction of the cylinder body, the inner peripheral wall of one end of the cylinder body (44) far away from the cylindrical part (43) is provided with a second external thread spline (421) along the axial direction of the cylinder body, the inner peripheral wall of the chamber (11) is provided with a first external thread spline (412) which is matched with the first internal thread spline (411) along the axial direction of the chamber, the outer peripheral wall of the second shaft section (22) is provided with a second internal thread spline (422) which is matched with the second external thread spline (421) along the axial direction of the second shaft section, the axial length of the first external thread spline (412) is smaller than the axial length of the first internal thread spline (411), and the axial length of the second external thread spline (421) is smaller than the axial length of the second internal thread spline (422).
6. The helical oscillating hydraulic cylinder of claim 2, wherein: a first bearing (S1) is rotatably arranged between the first sleeve (5) and the first shaft section (21), and a second bearing (S2) is rotatably arranged between the second sleeve (6) and the second shaft section (22).
7. The helical oscillating hydraulic cylinder of claim 1, wherein: a plurality of sealing elements (O) are arranged between the first sleeve (5) and the inner peripheral wall of the cylinder cover (3) and between the output rotating shafts (2).
8. The helical oscillating hydraulic cylinder of claim 1, wherein: a rotary encoder (7) is further arranged between the cylinder cover (3) and the output rotating shaft (2).
9. The helical oscillating hydraulic cylinder of claim 1, wherein: the first sleeve (5) is provided with a plurality of first oil channels (201) on the same plane in the radial direction, and the first sleeve (5) is provided with a plurality of second oil channels (202) on the same plane in the radial direction.
10. The helical oscillating hydraulic cylinder of claim 1, wherein: one end of the cylinder body (1) far away from the cylinder cover (3) is provided with a first flange (14), and one end of the output rotating shaft (2) located outside the cavity (11) is provided with a second flange (23).
CN202211682795.XA 2022-12-27 2022-12-27 Spiral swing hydraulic cylinder Pending CN116379034A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211682795.XA CN116379034A (en) 2022-12-27 2022-12-27 Spiral swing hydraulic cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211682795.XA CN116379034A (en) 2022-12-27 2022-12-27 Spiral swing hydraulic cylinder

Publications (1)

Publication Number Publication Date
CN116379034A true CN116379034A (en) 2023-07-04

Family

ID=86977481

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211682795.XA Pending CN116379034A (en) 2022-12-27 2022-12-27 Spiral swing hydraulic cylinder

Country Status (1)

Country Link
CN (1) CN116379034A (en)

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