CN113090608B - Hydraulic jacking oil cylinder - Google Patents
Hydraulic jacking oil cylinder Download PDFInfo
- Publication number
- CN113090608B CN113090608B CN202110331615.2A CN202110331615A CN113090608B CN 113090608 B CN113090608 B CN 113090608B CN 202110331615 A CN202110331615 A CN 202110331615A CN 113090608 B CN113090608 B CN 113090608B
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- Prior art keywords
- cylinder
- piston
- piston rod
- oil
- seal
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Classifications
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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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder 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
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
-
- 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
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
-
- 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
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
- F15B15/1461—Piston rod sealings
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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 hydraulic jacking cylinder which comprises a cylinder barrel, a piston rod, a piston, a cylinder lug, an oil delivery pipe, a cylinder bottom and a guide sleeve, wherein the piston rod is in a cylindrical shape, the top of the piston rod is fixedly connected with the cylinder lug, the bottom of the piston rod is fixedly connected with the piston, the piston comprises a piston stem, a sealing element mounting ring and an annular sealing element, the top of the piston stem and the bottom of the piston rod are fixedly connected with the cylinder bottom of the cylinder barrel and are fixedly connected with the bottom of the cylinder barrel to seal the bottom of the cylinder barrel, the guide sleeve is fixedly arranged at the top of the cylinder barrel, the side wall of the cylinder lug is provided with an oil inlet I and an oil inlet II, the inside of the cylinder lug is provided with an oil inlet channel I and an oil inlet channel II corresponding to the oil inlet I and the oil inlet I, the oil inlet channel I is connected with the oil delivery pipe, the oil delivery pipe penetrates through the piston rod and the piston stem and is communicated with the inner cavity of the cylinder barrel, the piston stem is provided with an oil return channel communicated with the inner cavity of the cylinder barrel and the inner cavity of the piston rod, and the oil inlet channel II is communicated with the inner cavity of the piston rod.
Description
Technical Field
The invention belongs to the technical field of hydraulic cylinders, and particularly relates to a hydraulic jacking cylinder.
Background
The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). The device has simple structure and reliable operation. When it is used to realize reciprocating motion, it can eliminate speed reducer, and has no transmission clearance and smooth motion, so that it can be widely used in hydraulic systems of various machines. The output force of the hydraulic cylinder is in direct proportion to the effective area of the piston and the pressure difference between two sides of the effective area of the piston; the hydraulic cylinder basically consists of a cylinder barrel, a cylinder cover, a piston rod, a sealing device, a buffer device and an exhaust device. The buffer device and the exhaust device are necessary for other devices depending on the specific application.
The conventional hydraulic jack-up cylinder, as shown in fig. 1, the piston rod is arranged in the cylinder barrel, two ends of the cylinder barrel are respectively sealed by sealing elements, the piston rod is provided with a piston and divides the inner cavity of the cylinder body into a first cavity and a second cavity, the cylinder body is provided with a first oil duct leading to the first cavity and a second oil duct leading to the second cavity, and hydraulic oil is pumped into the first cavity and the second cavity respectively through the first oil duct and the second oil duct to control the movement stroke of the piston rod.
The hydraulic jacking cylinder has the following defects:
1. because the cylinder barrel wall is thinner, a connecting device for connecting the first oil duct with the oil inlet pipeline, the second oil duct with the oil inlet pipeline is required to be arranged on the cylinder body, and the connecting device and the oil inlet pipeline are driven when the cylinder body moves, so that the connecting device is easy to damage;
2. the initial deflection formed by dead weight is large when the piston rod of the long-stroke hydraulic jacking cylinder is fully extended, and the piston rod is easy to damage and bend.
Disclosure of Invention
The invention aims to solve the technical problems and provides a hydraulic jacking cylinder.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the hydraulic jacking oil cylinder comprises a cylinder barrel, a piston rod, a piston, an oil cylinder lug, an oil delivery pipe, an oil cylinder bottom and a guide sleeve, wherein the piston rod is in a cylindrical shape, the top of the piston rod is fixedly connected with the oil cylinder lug, the bottom of the piston rod is fixedly connected with the piston, the piston comprises a piston stem, a sealing element mounting ring and an annular sealing element, the top of the piston stem is fixedly connected with the bottom of the piston rod, the sealing element mounting ring is sleeved outside the piston stem and is fixedly connected with the piston stem, the outer diameter of the sealing element mounting ring is smaller than the inner diameter of the cylinder barrel, the sealing element mounting ring is provided with a circle of sealing element mounting groove at the periphery, the annular sealing element is fixedly installed in the sealing ring mounting groove, the piston rod and the piston are arranged in the cylinder barrel, the bottom of the cylinder barrel is fixedly connected with the bottom of the sealing element, the guide sleeve is fixedly arranged at the top of the cylinder barrel and seals a gap between the piston rod and the piston rod, the first oil cylinder stem and the second oil cylinder stem are sleeved on the side wall, the sealing element mounting ring is provided with an inner cavity corresponding to the first oil cylinder stem and the second oil cylinder and the inner cavity, the first oil cylinder and the second oil cylinder and the inner cavity and the first oil cylinder and the second oil cylinder are communicated with the oil inlet channel and the inner cavity and the second oil cylinder are communicated with the oil inlet channel.
Preferably, a plurality of sealing ring mounting grooves are axially formed in the inner wall of the guide sleeve, sealing rings are respectively arranged in the sealing ring mounting grooves, and the sealing rings sequentially comprise 5-type Eletto seals, RU series sealing elements, wear-resistant rings and K-type Teflon Kang Site seals along the direction from the top to the bottom of the piston rod.
Preferably, the annular sealing element comprises an elastic body and check rings at two sides, the section of the elastic body is in a convex shape, the section of the check ring is in an L shape, and the check ring is clamped at the step of the sealing ring mounting groove.
Preferably, the hydraulic jacking cylinder further comprises a dust cover, the dust cover is sleeved on the periphery of the piston rod, the top of the dust cover is mounted on the cylinder earrings through the anchor ear, the bottom of the dust cover is mounted on the cylinder barrel through the anchor ear, and the dust cover is a zipper type dust cover.
Preferably, the cross section of the oil cylinder earring is rectangular.
Preferably, a bolt groove is formed in the top end of the oil cylinder lug.
Preferably, the piston is provided with a fixing screw mounting groove, the axis of the fixing screw mounting groove is perpendicular to the axis of the piston, and a fixing screw for limiting the relative rotation of the piston core column and the sealing element mounting ring is arranged in the fixing screw mounting groove.
Preferably, the bottom surface of the cylinder bottom of the oil cylinder is conical.
Preferably, a protecting piece is fixedly arranged outside the cylinder barrel, the protecting piece is in a circular ring table shape, and the top of the protecting piece faces to the bottom of the cylinder barrel.
After the technical scheme is adopted, the invention has the following advantages:
according to the hydraulic jacking oil cylinder, the first oil inlet and the second oil inlet are arranged on the oil cylinder earrings, and the oil cylinder earrings are relatively fixed, so that an oil inlet pipeline connected with the first oil inlet and the second oil inlet cannot be driven by the movement of the cylinder body, and a connecting device for connecting the first oil inlet and the second oil inlet is not easy to damage; the cavity inside the piston rod is communicated with the cavity outside the piston rod through the oil return flow channel, so that the pressure applied to the inside and the outside of the piston rod in the cylinder barrel is equal in the lifting process of the oil cylinder, the radial offset load applied to the piston rod is small, and the piston rod is not easy to bend and deform; in addition, although the flexibility of the cylindrical piston rod is larger and the bending deformation is larger compared with that of the solid rod-shaped piston rod when the piston rod is fully extended, when the oil cylinder is retracted, the piston rod automatically straightens due to the fact that the flexibility of the cylindrical piston rod is larger and the guide sleeve has a relatively longer axial distance under the action of the pressure of the guide sleeve on the outer wall of the piston rod and the action of the high-pressure hydraulic oil on the inner wall of the piston rod.
Drawings
Fig. 1 is a schematic structural view of a conventional hydraulic jack cylinder;
FIG. 2 is a schematic diagram of a hydraulic jack of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a partial enlarged view at B in FIG. 2;
in the figure:
1-a cylinder barrel; 2-a piston rod; 3-piston; 301-piston stem; 3011-an oil return flow passage; 302-a seal mounting ring; 303-annular seal; 3031-an elastomer; 3032-retainer ring; 4-an oil cylinder earring; 401-first oil inlet; 402-second oil inlet; 403-an oil inlet runner I; 404-an oil inlet runner II; 405-bolt slots; 5-oil delivery pipe; 6, a dustproof sleeve; 7-the bottom of the oil cylinder; 8-a guide sleeve; 9-fixing screws; form 10-5 elmend seal; 11-RU series seals; 12-wear rings; 13-K type t Kang Site seal; 14-hoops; 15-guard.
Description of the embodiments
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 2-4, the hydraulic jacking cylinder comprises a cylinder barrel 1, a piston rod 2, a piston 3, a cylinder ear ring 4, an oil delivery pipe 5, a dust cover 6, a cylinder bottom 7 and a guide sleeve 8.
The section of the oil cylinder earring 4 is rectangular, and the rectangular oil cylinder earring 4 is convenient to fix and limit.
The piston rod 2 is cylindrical, the top of the piston rod 2 is fixedly connected with the oil cylinder earrings 4, and the bottom of the piston rod 2 is fixedly connected with the piston 3.
The piston 3 comprises a piston stem 301, a seal mounting ring 302, an annular seal 303. The top of the piston stem 301 is fixedly connected with the bottom of the piston rod 2. The seal mounting ring 302 is sleeved outside the piston stem 301 and fixedly connected with the piston stem 301. In this embodiment, the seal mounting ring 302 is screwed to the piston stem 301. The piston 3 is provided with a fixing screw mounting groove, and the axis of the fixing screw mounting groove is perpendicular to the axis of the piston 3. The fixing screw mounting groove is internally provided with a fixing screw 9 for limiting the relative rotation of the piston core column 301 and the sealing element mounting ring 302. The seal mounting ring 302 has an outer diameter smaller than the inner diameter of the cylinder tube 1. The seal mounting ring 302 is provided with a ring of seal mounting grooves on the outer periphery, and the annular seal 303 is fixedly mounted in the seal mounting grooves.
In this embodiment, the annular seal 303 includes an elastic body 3031 and two side check rings 3032, the cross section of the elastic body 3031 is in a convex shape, the cross section of the check ring 3032 is in an L shape, and the check ring 3032 is clamped at the step of the seal ring installation groove. The elastic body 3031 is used as a force application element filled with polytetrafluoroethylene, the two side check rings 3032 are made of high-elastic modulus materials, and the elastic body 3031 has high rigidity and extrusion resistance under high temperature and high pressure, so that the extrusion resistance of the elastic body 3031 is improved.
The piston rod 2 and the piston 3 are arranged in the cylinder barrel 1, and the cylinder bottom 7 is fixedly connected to the bottom of the cylinder barrel 1 and seals the bottom of the cylinder barrel 1. The bottom surface of the cylinder bottom 7 is conical, so that the hydraulic jacking cylinder has smaller resistance when being inserted into goods. The guide sleeve 8 is fixedly arranged at the top of the cylinder barrel 1 and seals a gap between the piston rod 2 and the cylinder barrel 1.
A plurality of sealing ring mounting grooves are axially formed in the inner wall of the guide sleeve 8, and sealing rings are respectively arranged in the sealing ring mounting grooves. In this embodiment, the sealing ring sequentially includes a type 5 eiderdown seal 10, an RU series seal 11, a wear ring 12, and a type K Kang Site seal 13 along the top-to-bottom direction of the piston rod 2. The K-type Kang Site seal 13 alone provides a relatively large amount of leakage as a piston rod seal, and for better sealing, a secondary seal is typically added, with RU series seal 11 being an ideal choice having cooperating primary and secondary lips that create an optimally loaded balance operating point with good rebound ability and flexibility.
The oil cylinder earring 4 is provided with an oil inlet I401 and an oil inlet II 402 on the side walls, and an oil inlet runner I403 and an oil inlet runner II 404 corresponding to the oil inlet I401 and the oil inlet II 402 are arranged in the oil cylinder earring. The top end of the oil cylinder earring 4 is provided with a bolt groove 405, so that the hydraulic jacking oil cylinder is convenient to install. The first oil inlet flow passage 403 is connected with the oil delivery pipe 5, and the oil delivery pipe 5 passes through the piston rod 2 and the piston core column 301 and is communicated with the inner cavity of the cylinder barrel 1. The piston core column 301 is provided with an oil return flow passage 3011 which is communicated with the inner cavity of the cylinder barrel 1 and the inner cavity of the piston rod 2. The second oil inlet flow passage 404 is communicated with the inner cavity of the piston rod 2.
The dustproof sleeve 6 is sleeved on the periphery of the piston rod 2, the top of the dustproof sleeve 6 is mounted on the oil cylinder ear ring 4 through the anchor ear 14, and the bottom of the dustproof sleeve 6 is mounted on the cylinder barrel 1 through the anchor ear 14.
The cylinder barrel 1 is also fixedly provided with a protection piece 15, the protection piece 15 is in a circular ring table shape, and the top of the protection piece 15 faces the cylinder bottom 7 of the oil cylinder. The tower-shaped protection piece 15 is used for preventing the cylinder piston rod 2 from being scratched by particles and being physically knocked by suspended objects.
According to the hydraulic jacking oil cylinder, the first oil inlet and the second oil inlet are arranged on the oil cylinder earrings, and the oil cylinder earrings are relatively fixed, so that an oil inlet pipeline connected with the first oil inlet and the second oil inlet cannot be driven by the movement of the cylinder body, and a connecting device for connecting the first oil inlet and the second oil inlet is not easy to damage; the cavity inside the piston rod is communicated with the cavity outside the piston rod through the oil return flow channel, so that the pressure applied to the inside and the outside of the piston rod in the cylinder barrel is equal in the lifting process of the oil cylinder, the radial offset load applied to the piston rod is small, and the piston rod is not easy to bend and deform; in addition, although the flexibility of the cylindrical piston rod is larger and the bending deformation is larger compared with that of the solid rod-shaped piston rod when the piston rod is fully extended, when the oil cylinder is retracted, the piston rod automatically straightens due to the fact that the flexibility of the cylindrical piston rod is larger and the guide sleeve has a relatively longer axial distance under the action of the pressure of the guide sleeve on the outer wall of the piston rod and the action of the high-pressure hydraulic oil on the inner wall of the piston rod.
In addition to the above preferred embodiments, the present invention has other embodiments, and various changes and modifications may be made by those skilled in the art without departing from the spirit of the invention, which is defined in the appended claims.
Claims (9)
1. The hydraulic jacking oil cylinder is characterized by comprising a cylinder barrel, a piston rod, a piston, an oil cylinder lug, an oil delivery pipe, an oil cylinder bottom and a guide sleeve, wherein the piston rod is cylindrical, the top of the piston rod is fixedly connected with the oil cylinder lug, the bottom of the piston rod is fixedly connected with the piston, the piston comprises a piston core column, a sealing element mounting ring and an annular sealing element, the top of the piston core column is fixedly connected with the bottom of the piston rod, the sealing element mounting ring is sleeved outside the piston core column and is fixedly connected with the piston core column, the outer diameter of the sealing element mounting ring is smaller than the inner diameter of the cylinder barrel, the sealing element mounting ring is provided with a circle of sealing element mounting groove at the periphery, the annular sealing element is fixedly arranged in the sealing element mounting groove, the piston rod and the piston are arranged in the cylinder barrel, the bottom of the cylinder barrel is fixedly connected with the bottom of the cylinder barrel, the guide sleeve is fixedly arranged at the top of the cylinder barrel and is used for sealing a gap between the piston rod and the cylinder barrel, the first oil cylinder core column and the inner cavity and the second oil cylinder core column are sleeved on the side wall of the cylinder and the inner cavity, the first oil cylinder core ring and the second oil cylinder core are correspondingly communicated with the inner cavity and the oil delivery pipe and the first oil cylinder and the inner cavity and the second oil cylinder are communicated with the oil inlet channel and the inner cavity and the second oil channel.
2. The hydraulic jacking cylinder as claimed in claim 1, wherein a plurality of seal ring installation grooves are axially provided on an inner wall of the guide sleeve, seal rings are respectively installed in the seal ring installation grooves, and the seal rings sequentially comprise a 5-type eiderdown seal, an RU series seal, a wear-resistant ring and a K-type Kang Site seal along a top-to-bottom direction of the piston rod.
3. The hydraulic jack of claim 1, wherein the annular seal member includes an elastic body and two side retainers, the elastic body has a convex cross section, the retainer has an L-shaped cross section, and the retainer is clamped at the step of the seal ring installation groove.
4. The hydraulic jack cylinder of claim 1, further comprising a dust cover, wherein the dust cover is sleeved on the periphery of the piston rod, the top of the dust cover is mounted on the cylinder ear via a hoop, the bottom of the dust cover is mounted on the cylinder via a hoop, and the dust cover is a zipper-type dust cover.
5. The hydraulic jack of claim 1, wherein the cross section of the cylinder ear is rectangular.
6. The hydraulic jack of claim 1, wherein the top end of the cylinder ear is provided with a bolt slot.
7. The hydraulic jack-up cylinder of claim 1, wherein the piston is provided with a set screw mounting groove, the axis of the set screw mounting groove is perpendicular to the axis of the piston, and a set screw for limiting the relative rotation of the piston stem and the seal mounting ring is provided in the set screw mounting groove.
8. The hydraulic jack of claim 1, wherein the bottom surface of the cylinder bottom is conical.
9. The hydraulic jack-up cylinder of claim 1, wherein a guard is fixedly disposed outside the cylinder barrel, the guard is in the shape of a circular ring table, and the top of the guard faces the cylinder bottom of the cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110331615.2A CN113090608B (en) | 2021-03-29 | 2021-03-29 | Hydraulic jacking oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110331615.2A CN113090608B (en) | 2021-03-29 | 2021-03-29 | Hydraulic jacking oil cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113090608A CN113090608A (en) | 2021-07-09 |
| CN113090608B true CN113090608B (en) | 2023-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110331615.2A Active CN113090608B (en) | 2021-03-29 | 2021-03-29 | Hydraulic jacking oil cylinder |
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| Country | Link |
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| CN (1) | CN113090608B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57167507A (en) * | 1981-04-03 | 1982-10-15 | Mitsubishi Heavy Ind Ltd | Variable output cylinder |
| CN205503617U (en) * | 2015-12-31 | 2016-08-24 | 徐州重型机械有限公司 | Flexible hydro -cylinder structure |
| CN107401533A (en) * | 2017-08-08 | 2017-11-28 | 华南理工大学 | A kind of end control type internal-expansion type mechanical interlocking hydraulic jack and its operation method |
| CN108374812A (en) * | 2018-05-17 | 2018-08-07 | 马鞍山纽盟知识产权管理服务有限公司 | A kind of hydraulic cylinder |
| CN209228766U (en) * | 2018-11-15 | 2019-08-09 | 徐州顺隆液压科技有限公司 | A kind of hydraulically extensible oil |
-
2021
- 2021-03-29 CN CN202110331615.2A patent/CN113090608B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57167507A (en) * | 1981-04-03 | 1982-10-15 | Mitsubishi Heavy Ind Ltd | Variable output cylinder |
| CN205503617U (en) * | 2015-12-31 | 2016-08-24 | 徐州重型机械有限公司 | Flexible hydro -cylinder structure |
| CN107401533A (en) * | 2017-08-08 | 2017-11-28 | 华南理工大学 | A kind of end control type internal-expansion type mechanical interlocking hydraulic jack and its operation method |
| CN108374812A (en) * | 2018-05-17 | 2018-08-07 | 马鞍山纽盟知识产权管理服务有限公司 | A kind of hydraulic cylinder |
| CN209228766U (en) * | 2018-11-15 | 2019-08-09 | 徐州顺隆液压科技有限公司 | A kind of hydraulically extensible oil |
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| CN113090608A (en) | 2021-07-09 |
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