CN112483504A - Double-acting single-rod symmetrical hydraulic cylinder capable of balancing gravity - Google Patents
Double-acting single-rod symmetrical hydraulic cylinder capable of balancing gravity Download PDFInfo
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- CN112483504A CN112483504A CN202011324639.7A CN202011324639A CN112483504A CN 112483504 A CN112483504 A CN 112483504A CN 202011324639 A CN202011324639 A CN 202011324639A CN 112483504 A CN112483504 A CN 112483504A
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- cylinder
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- end cover
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- double
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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
- F15B15/1423—Component parts; Constructional details
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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
- F15B15/1423—Component parts; Constructional details
- F15B15/1428—Cylinders
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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
- F15B15/1423—Component parts; Constructional details
- F15B15/1438—Cylinder to end cap assemblies
- F15B15/1442—End cap sealings
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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
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
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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
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
- F15B15/1461—Piston rod sealings
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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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
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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 belongs to the field of hydraulic servo executing elements, and particularly discloses a double-acting single-rod symmetrical hydraulic cylinder capable of balancing gravity. This pneumatic cylinder includes cylinder, top end cover, bottom end cover, cavity piston rod, piston and the interior oil pipe of jar, wherein: the cylinder barrel is vertically arranged, the upper part of the cylinder barrel is sealed by a top end cover, and the lower part of the cylinder barrel is sealed by a bottom end cover; the hollow piston rod penetrates through the top end cover to enter the cylinder barrel, and the lower end of the hollow piston rod is connected with the piston so as to drive the piston to move up and down; the in-cylinder oil pipe passes through the piston and enters the interior of the hollow piston rod. According to the invention, the annular cross-sectional area between the cylinder barrel and the hollow piston rod is equal to the excircle cross-sectional area of the oil pipe in the cylinder, so that symmetrical reciprocating motion is realized, the required installation space is small, meanwhile, the third working chamber is arranged for balancing gravity, and no hydraulic cylinder is required to be additionally configured, so that the motion of the hydraulic cylinder can be controlled by adopting a symmetrical servo valve, and the control precision is higher.
Description
Technical Field
The invention belongs to the field of hydraulic servo executing elements, and particularly relates to a double-acting single-rod symmetrical hydraulic cylinder capable of balancing gravity.
Background
A double acting hydraulic cylinder is a hydraulic cylinder that can input pressure oil from both sides of a piston. The existing double-acting symmetrical hydraulic cylinder is mostly provided with double outlet rods, and piston rods at two ends of the hydraulic cylinder extend out when the hydraulic cylinder works, so that the required working space is large, and when only one side has load, the space at the other end of the hydraulic cylinder is wasted.
When the load is in the vertical direction, the existing double-acting symmetrical hydraulic cylinder greatly improves the installation height or needs to punch holes at the bottom of the ground, and the hydraulic cylinder needs to be additionally equipped to balance the gravity when the symmetrical control is carried out, so that space resources and financial resources are greatly wasted. However, in the situation that the load is required to do reciprocating symmetrical motion in the vertical direction, the symmetrical hydraulic cylinders are convenient to control and the control algorithm is simple and easy to implement due to the fact that gravity is balanced; the measurement and the instruction of the control system do not need to be converted, so that the control precision is higher; the servo valve does not need to be matched with an asymmetric custom valve, the cost is lower, and the demand of the symmetric hydraulic cylinder is large.
Therefore, aiming at the requirements, the symmetrical hydraulic cylinder which is small in space volume, safe, low in cost, high in precision and convenient to control and integrates driving and gravity balancing is designed, and the symmetrical hydraulic cylinder has very important significance and engineering application value for reduction of the volume of a hydraulic system, reduction of cost, accurate control of load motion and optimization of a control algorithm.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a double-acting single-rod symmetrical hydraulic cylinder capable of balancing gravity, wherein the area of an annular cross section between a cylinder barrel and a hollow piston rod is equal to the area of an excircle cross section of an oil pipe in the cylinder, so that the effective acting areas of a first working chamber and a second working chamber are equal, the symmetrical reciprocating motion is realized, and meanwhile, a third working chamber is arranged for balancing gravity, so that the accuracy of motion control can be effectively improved, and the installation space is reduced.
In order to achieve the purpose, the invention provides a double-acting single-rod symmetrical hydraulic cylinder capable of balancing gravity, which comprises a cylinder barrel, a top end cover, a bottom end cover, a hollow piston rod, a piston and an in-cylinder oil pipe, wherein: the cylinder barrel is vertically arranged, the upper part of the cylinder barrel is sealed by the top end cover, and the lower part of the cylinder barrel is sealed by the bottom end cover; the hollow piston rod penetrates through the top end cover to enter the cylinder barrel, and the lower end of the hollow piston rod is connected with the piston so as to drive the piston to move up and down; the in-cylinder oil pipe penetrates through the piston and enters the interior of the hollow piston rod;
the space between the hollow piston rod and the cylinder barrel forms a first working cavity and is communicated with a first working port on the top end cover; the inner space of the oil pipe in the cylinder forms a second working cavity and is communicated with a second working port on the bottom end cover; the annular cross section area between the cylinder barrel and the hollow piston rod is equal to the excircle cross section area of the oil pipe in the cylinder, so that the motion symmetry of the piston is ensured; and the space between the oil pipe in the cylinder and the cylinder barrel forms a third working chamber, is communicated with a third working port on the cylinder barrel and is used for balancing load gravity.
Preferably, the lower end of the top end cover is provided with an annular groove, the upper end of the piston is provided with an annular boss, and the annular groove and the annular boss are matched with each other to form clearance throttling for buffering the tail end of the upstroke.
Preferably, the upper end of the bottom end cover is provided with an annular groove, the lower end of the piston is provided with an annular boss, and the annular groove and the annular boss are matched with each other to form clearance throttling for buffering the tail end of the downward stroke.
As a further preference, a top end cap seal is provided between the hollow piston rod and the top end cap.
As a further preference, a piston seal is provided between the piston and the cylinder.
As a further preference, an in-piston seal is provided between the in-cylinder oil pipe and the piston.
Preferably, the top of the in-cylinder oil pipe is provided with a guide flange, and the lower part of the guide flange is provided with an oil supplementing hole.
As a further preference, the length of the in-cylinder oil pipe is greater than the length of the cylinder barrel.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. the invention provides a double-acting single-rod symmetrical hydraulic cylinder capable of balancing gravity, wherein the area of an annular cross section between a cylinder barrel and a hollow piston rod is equal to the area of the section of an excircle of an oil pipe in the cylinder, thereby ensuring that the effective action areas of the first working cavity and the second working cavity are equal, when oil with the same pressure and flow is respectively input into the first working cavity and the second working cavity, the first working cavity and the second working cavity can generate the same acting force and the same reciprocating speed on the piston to realize symmetrical reciprocating motion, compared with the traditional double-acting double-rod hydraulic cylinder, the double-acting double-rod hydraulic cylinder has smaller installation space, and meanwhile, the third working chamber is arranged below the double-acting double-rod hydraulic cylinder for balancing gravity, and the hydraulic cylinder is not required to be additionally configured, so that the hydraulic cylinder can be controlled by adopting a symmetrical servo valve for movement, the control precision is higher, and the double-acting double-rod hydraulic cylinder is suitable for a symmetrical reciprocating hydraulic servo system which needs to balance gravity and has strict requirements on space;
2. particularly, the annular grooves are formed in the top end cover and the bottom end cover, and the upper end and the lower end of the piston are provided with the matched annular bosses, so that gap throttling is formed, the impact on the formed tail end is reduced, and the safety of the double-acting single-rod symmetrical hydraulic cylinder is effectively improved;
3. in addition, the sealing performance of the hydraulic cylinder can be effectively improved by arranging the top end cover seal, the piston inner seal and the piston seal.
Drawings
FIG. 1 is a schematic diagram of a double acting, single rod, symmetrical hydraulic cylinder constructed in accordance with a preferred embodiment of the present invention to counterbalance gravitational forces.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-hollow piston rod, 2-top end cover seal, 3-top end cover, 4-cylinder, 5-piston inner seal, 6-piston, 7-piston seal, 8-cylinder inner oil pipe, 9-bottom end cover, 10-first working port, 11-first working chamber, 12-second working chamber, 13-third working chamber, 14-third working port and 15-second working port.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, an embodiment of the present invention provides a double-acting single-rod symmetric hydraulic cylinder capable of balancing gravity, which includes a cylinder barrel 4, a top end cover 3, a bottom end cover 9, a hollow piston rod 1, a piston 6, and an in-cylinder oil pipe 8, wherein: the cylinder barrel 4 is cylindrical and vertically placed, the upper part of the cylinder barrel is sealed by a top end cover 3, and the lower part of the cylinder barrel is sealed by a bottom end cover 9; the bottom end cover 9 is a cylindrical structure, the axis part of the bottom end cover is provided with a blind hole, a hole is arranged in the circumferential direction and is intersected with the blind hole, and the axes are mutually vertical, so that a second working port 15 is formed; the hollow piston rod 1 penetrates through the top end cover 3 to enter the cylinder barrel 4, and the lower end of the hollow piston rod is connected with the piston 6 so as to drive the piston 6 to move up and down; the oil pipe 8 in the cylinder is cylindrical and penetrates through the piston 6 to enter the hollow piston rod 1;
the space between the hollow piston rod 1 and the cylinder 4 forms a first working chamber 11 and is communicated with a first working port 10 on the top end cover 3; the inner space of the oil pipe 8 in the cylinder forms a second working cavity 12 and is communicated with a second working port 15 on the bottom end cover 9; the annular section area between the cylinder barrel 4 and the hollow piston rod 1 is equal to the excircle section area of the oil pipe 8 in the cylinder, so as to ensure the symmetry of the movement of the piston 6; the space between the cylinder inner oil pipe 8 and the cylinder barrel 4 forms a third working chamber 13, and is communicated with a third working port 14 on the cylinder barrel 4 close to the bottom end, and is used for balancing load gravity.
Further, the lower end of the top end cover 3 is provided with an annular groove, and the upper end of the piston 6 is provided with an annular boss which are matched with each other to form gap throttling; the upper end of the bottom end cover 9 is provided with an annular groove, and the lower end of the piston 6 is provided with an annular boss which are matched with each other to form gap throttling.
Further, a top end cover seal 2 is arranged between the hollow piston rod 1 and the top end cover 3; a piston seal 7 is arranged between the piston 6 and the cylinder barrel 4; and a piston inner seal 5 is arranged between the cylinder oil pipe 8 and the piston 6.
Further, a guide flange is arranged at the top of the oil pipe 8 in the cylinder, and an oil supplementing hole is formed in the lower portion of the guide flange. And the length of the oil pipe 8 in the cylinder is larger than that of the cylinder barrel 4, so that the stroke can reach the bottom of the cylinder barrel.
The invention provides a double-acting single-rod symmetrical hydraulic cylinder capable of balancing gravity, which comprises the following working processes:
the first working port 10 and the second working port 15 are respectively communicated with a port of a servo valve A, B, and the third working port 14 is connected with a constant pressure source. When the second working port 15 supplies oil, the first working port 10 is communicated with an oil tank, and the hollow piston rod 1 extends upwards under the action of hydraulic oil pressure; on the contrary, when the first working port 10 supplies oil, the second working port 15 is communicated with the oil tank, and the hollow piston rod 1 retracts downwards under the action of hydraulic oil pressure. When the device works, the pressure of the constant-voltage source is adjusted, so that the output force of the third working cavity 13 is balanced with gravity, and the rack is kept in the middle position of movement; and then the servo valve is opened according to the control command, and the system is controlled to move. Because the annular area formed by the hollow piston rod 1 and the cylinder barrel 4 is equal to the outer circle area of the cross section of the oil pipe 8 in the cylinder, when oil with the same pressure and flow is respectively input into the first working port 10 and the second working port 15, the thrust and the reciprocating speed generated on the hollow piston rod 1 are also equal, and the movement of the hollow piston rod 1 has stronger symmetry.
The third working chamber 13, namely the balance chamber, is arranged, so that the load gravity is balanced during working, the number of hydraulic cylinders required by the system for balancing the gravity is reduced, and the cost is effectively reduced; the piston rod is a single-output rod, so that the problem of large occupied space of double-output rods of the symmetrical cylinders is effectively solved; the symmetry of the extension and retraction of the single-rod double-acting hydraulic cylinder solves the problem that a special servo valve is required to be adopted for the symmetrical control of the single-rod double-acting hydraulic cylinder, so that the cost is increased; meanwhile, because the hydraulic cylinder and the valve are in a symmetrical structural form, the calculation steps required when the measured displacement data is converted into the instruction data are reduced, and the control error can be effectively reduced.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (8)
1. The utility model provides a but balanced gravity's two effect list goes out pole symmetry pneumatic cylinder which characterized in that, this pneumatic cylinder includes cylinder (4), top end cover (3), bottom end cover (9), cavity piston rod (1), piston (6) and in-cylinder oil pipe (8), wherein: the cylinder barrel (4) is vertically arranged, the upper part of the cylinder barrel is sealed by the top end cover (3), and the lower part of the cylinder barrel is sealed by the bottom end cover (9); the hollow piston rod (1) penetrates through the top end cover (3) to enter the cylinder barrel (4), and the lower end of the hollow piston rod is connected with the piston (6) to drive the piston (6) to move up and down; the in-cylinder oil pipe (8) penetrates through the piston (6) and enters the interior of the hollow piston rod (1);
a space between the hollow piston rod (1) and the cylinder barrel (4) forms a first working chamber (11) and is communicated with a first working port (10) on the top end cover (3); the inner space of the oil pipe (8) in the cylinder forms a second working cavity (12) and is communicated with a second working port (15) on the bottom end cover (9); the annular cross section area between the cylinder barrel (4) and the hollow piston rod (1) is equal to the excircle cross section area of the oil pipe (8) in the cylinder, so that the motion symmetry of the piston (6) is ensured; and a space between the oil pipe (8) in the cylinder and the cylinder barrel (4) forms a third working chamber (13), is communicated with a third working port (14) on the cylinder barrel (4) and is used for balancing load gravity.
2. A double-acting single-rod symmetric hydraulic cylinder capable of balancing gravity according to claim 1, characterized in that the lower end of the top cover (3) is provided with an annular groove, while the upper end of the piston (6) is provided with an annular boss, which cooperate to form a gap restriction for the end of the upstroke buffering.
3. A double-acting single-rod symmetric hydraulic cylinder with balancing gravity according to claim 1, characterized in that the upper end of the bottom head cover (9) is provided with an annular groove, while the lower end of the piston (6) is provided with an annular boss, which cooperate to form a gap restriction for the end of the downstroke buffering.
4. A double-acting single-rod symmetric hydraulic cylinder with counterbalancing gravity according to claim 1, characterized in that a head-end-cap seal (2) is provided between the hollow piston rod (1) and the head-end cap (3).
5. A double-acting single-rod symmetric hydraulic cylinder capable of balancing gravity according to claim 1, characterized in that a piston seal (7) is provided between the piston (6) and the cylinder (4).
6. A double-acting, single-rod symmetric hydraulic cylinder capable of balancing gravity according to claim 1, characterized in that an in-piston seal (5) is provided between the in-cylinder oil tube (8) and the piston (6).
7. A double-acting single-rod symmetric hydraulic cylinder capable of balancing gravity according to claim 1, wherein a guide flange is provided on the top of the oil pipe (8) in the cylinder, and an oil replenishment hole is provided on the lower portion of the guide flange.
8. A double-acting single-rod symmetric hydraulic cylinder capable of balancing gravity according to any one of claims 1 to 7, characterized in that the length of the oil pipe (8) in the cylinder is greater than the length of the cylinder barrel (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011324639.7A CN112483504A (en) | 2020-11-24 | 2020-11-24 | Double-acting single-rod symmetrical hydraulic cylinder capable of balancing gravity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011324639.7A CN112483504A (en) | 2020-11-24 | 2020-11-24 | Double-acting single-rod symmetrical hydraulic cylinder capable of balancing gravity |
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| Publication Number | Publication Date |
|---|---|
| CN112483504A true CN112483504A (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011324639.7A Pending CN112483504A (en) | 2020-11-24 | 2020-11-24 | Double-acting single-rod symmetrical hydraulic cylinder capable of balancing gravity |
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| CN (1) | CN112483504A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864471A (en) * | 2021-12-03 | 2021-12-31 | 成都迈可森流体控制设备有限公司 | Annular cylinder straight stroke valve actuating mechanism capable of internally arranging valve rod |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1526960A (en) * | 2003-09-25 | 2004-09-08 | 浙江大学 | Single rod equal area double acting hydraulic cylinder capable of balancing weight |
| CN1584349A (en) * | 2004-06-04 | 2005-02-23 | 浙江大学 | Rough symmetric double actuating surfaces hydraulic cylinder with single rod |
| CN203655248U (en) * | 2013-12-20 | 2014-06-18 | 王钰 | Hydraulic oil pumping driving device |
| CN210531278U (en) * | 2019-04-25 | 2020-05-15 | 江苏恒盈动力科技有限公司 | Double-acting single-rod symmetrical hydraulic cylinder |
-
2020
- 2020-11-24 CN CN202011324639.7A patent/CN112483504A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1526960A (en) * | 2003-09-25 | 2004-09-08 | 浙江大学 | Single rod equal area double acting hydraulic cylinder capable of balancing weight |
| CN1584349A (en) * | 2004-06-04 | 2005-02-23 | 浙江大学 | Rough symmetric double actuating surfaces hydraulic cylinder with single rod |
| CN203655248U (en) * | 2013-12-20 | 2014-06-18 | 王钰 | Hydraulic oil pumping driving device |
| CN210531278U (en) * | 2019-04-25 | 2020-05-15 | 江苏恒盈动力科技有限公司 | Double-acting single-rod symmetrical hydraulic cylinder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864471A (en) * | 2021-12-03 | 2021-12-31 | 成都迈可森流体控制设备有限公司 | Annular cylinder straight stroke valve actuating mechanism capable of internally arranging valve rod |
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Application publication date: 20210312 |
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| RJ01 | Rejection of invention patent application after publication |