CN112081792B - Piston assembly with locking function - Google Patents
Piston assembly with locking function Download PDFInfo
- Publication number
- CN112081792B CN112081792B CN202010741279.4A CN202010741279A CN112081792B CN 112081792 B CN112081792 B CN 112081792B CN 202010741279 A CN202010741279 A CN 202010741279A CN 112081792 B CN112081792 B CN 112081792B
- Authority
- CN
- China
- Prior art keywords
- piston
- rod
- piston rod
- groove
- sealing element
- 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.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- F15B15/26—Locking mechanisms
Abstract
The invention discloses a piston assembly with a locking function, which comprises a first side piston, a middle piston, a second side piston, a piston rod, a pressing strip, a push rod, a first piston rod sealing element, a second piston rod sealing element, a piston sealing element and a guide belt, wherein the first side piston is connected with the middle piston through the push rod; the first side piston and the second side piston are symmetrically sleeved on two sides of the piston rod, and the middle piston is arranged on the piston rod and positioned between the first side piston and the second side piston; the first side piston and the second side piston are provided with a guide belt installation groove for installing a guide belt, a piston sealing element installation groove for installing a piston sealing element and a piston rod first sealing element installation groove for installing a piston rod first sealing element; the middle piston is provided with an inner hole in clearance fit with the piston rod, and is provided with a piston rod second sealing element mounting groove, an oil storage ring groove, a plurality of longitudinal long grooves and a plurality of radial holes for mounting a piston rod second sealing element; the press strip is arranged in a longitudinal elongated slot of the middle piston, and the push rod is arranged in a radial hole of the middle piston. The piston assembly can be locked at any position of the stroke of the hydraulic cylinder and the air cylinder.
Description
Technical Field
The invention belongs to the technical field of hydraulic pressure and pneumatics, and particularly relates to a piston assembly with a locking function.
Background
When some equipment works, the hydraulic cylinder and the air cylinder are required to be strictly kept at a certain position of the working stroke for a long time under a load condition. Common locking methods include hydraulic locking, pneumatic locking and mechanical locking. Because the hydraulic cylinder and the air cylinder have inevitable internal leakage, particularly serious internal leakage occurs after the piston seal is worn, the hydraulic cylinder and the air cylinder cannot be kept at required positions by the internal pressure of the hydraulic cylinder and the air cylinder.
In the prior art, the mechanical locking method is adopted mostly. Some technical schemes can only realize locking at a certain specific position of the stroke, such as the end point of the stroke, and cannot meet the locking requirement when the stroke changes; most technical schemes are used for mechanically locking the movement of a piston rod, and in principle, a disc spring compression deformation is used as a locking power source, and independent hydraulic pressure and air pressure are used as power sources for unlocking. When the load changes, the compression degree of the disc spring is adjusted to adapt, and the adjusting range is limited; compared with the output thrust of a hydraulic cylinder and an air cylinder, the locking force provided by the existing scheme is relatively small, and the locking capability is limited during heavy load.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a piston assembly with a locking function, which is suitable for working conditions that a hydraulic cylinder and an air cylinder need to be stopped at any position of a stroke of the hydraulic cylinder and the air cylinder for a long time.
The piston assembly with the locking function comprises a first side piston, a middle piston, a second side piston, a piston rod, a pressing strip, a push rod, a first piston rod sealing element, a second piston rod sealing element, a piston sealing element and a guide belt, wherein:
the first side piston and the second side piston have the same structure and are symmetrically sleeved on two sides of the piston rod, and the middle piston is arranged on the piston rod and is positioned between the first side piston and the second side piston;
the first side piston and the second side piston are respectively provided with a guide belt installation groove for installing a guide belt, a piston sealing element installation groove for installing a piston sealing element and a piston rod first sealing element installation groove for installing a piston rod first sealing element;
the middle piston is provided with an inner hole in clearance fit with the piston rod, a piston rod second sealing element mounting groove for mounting a piston rod second sealing element is processed on the inner circumferential wall of the middle piston, an oil storage ring groove is further processed on the inner circumferential wall of the middle piston, a plurality of longitudinal long grooves are processed on the outer circumferential wall of the middle piston, a plurality of radial holes are processed on each longitudinal long groove on the inner circumferential wall of the middle piston in the radial direction, and the oil storage ring groove is communicated with the longitudinal long grooves through the radial holes;
the press strip is arranged in a longitudinal elongated slot of the middle piston, and the push rod is arranged in a radial hole of the middle piston.
Preferably, in the above-described piston assembly with a locking function of the present invention, the guide band installation groove and the piston seal installation groove of the first side piston are provided on the outer circumferential wall of the first side piston, and the piston rod first seal installation groove of the first side piston is provided on the inner circumferential wall of the first side piston.
Preferably, in the above-described piston assembly with a locking function of the present invention, the guide band installation groove and the piston seal installation groove of the second side piston are provided on an outer circumferential wall of the second side piston, and the piston rod first seal installation groove of the second side piston is provided on an inner circumferential wall of the second side piston.
Preferably, in the piston assembly with a locking function of the present invention, the piston rod second sealing member mounting grooves are respectively formed in inner circumferential walls of both sides of the intermediate piston, the oil storage ring groove is formed in the inner circumferential wall of the intermediate portion of the intermediate piston, the oil storage ring groove has a diameter larger than that of the inner hole, and the plurality of longitudinal long grooves are radially and uniformly distributed in the outer circumferential wall of the intermediate piston.
Preferably, in the piston assembly with the locking function of the present invention, the pressing bar is in clearance fit with the longitudinal long groove in the width direction, the bottom surface of the pressing bar is a plane and is attached to the flat bottom surface of the longitudinal long groove, the top surface of the pressing bar is an arc surface and is in clearance fit with the inner wall of the cylinder barrel of the hydraulic cylinder or the air cylinder in which the piston assembly is installed, and the arc radius of the arc surface is the same as the radius of the cylinder barrel.
Preferably, in the piston assembly with a locking function of the present invention, the push rod includes a cylindrical body, a sealing ring installation groove is processed on an outer circumferential wall of the cylindrical body, and an O-ring is installed in the sealing ring installation groove.
Preferably, in the piston assembly with a locking function according to the present invention, one end of the piston rod is provided with a shoulder, the center of the piston rod is provided with a piston rod inner hole, and a plurality of oil passages are communicated between the piston rod inner hole and the oil storage ring groove of the intermediate piston.
Preferably, in the piston assembly with a locking function according to the present invention, the first side piston, the middle piston, and the second side piston are sequentially mounted on the piston rod, one side of which is positioned by the shoulder, and the other side of which is fixed by the locking nut screwed on the end of the piston rod where the shoulder is not provided.
Preferably, in the piston assembly with the locking function of the present invention, the material of the bead is a polyamide rod.
The piston assembly with the locking function is arranged in a cylinder barrel of a hydraulic cylinder and an air cylinder, can be locked at any position of the stroke of the hydraulic cylinder and the air cylinder, meets the process requirement that the hydraulic cylinder and the air cylinder stop at a required position for a long time, and has the advantages of large locking force, convenient adjustment, low installation requirement and simple maintenance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1a is an assembled sectional view of a piston assembly having a locking function of the present invention.
FIG. 1b isbase:Sub>A cross-sectional view taken along A-A in FIG. 1base:Sub>A.
Fig. 2 is an enlarged sectional view of a first side piston in the piston assembly with locking function of the present invention.
Fig. 3a is a sectional view of an intermediate piston in the piston assembly having a locking function according to the present invention.
Fig. 3B is a cross-sectional view taken along B-B in fig. 3 a.
Fig. 4 is an enlarged cross-sectional view of a compression bead in the piston assembly with a locking function of the present invention.
Fig. 5 is a schematic structural view of a carrier rod in the piston assembly having a locking function according to the present invention.
Description of the reference numerals:
1-a first side piston, 1.1-a guide belt installation groove, 1.2-a piston sealing element installation groove and 1.3-a piston rod first sealing element installation groove;
2-middle piston, 2.1, 2.2-piston rod second sealing piece mounting groove, 2.3-oil storage ring groove, 2.4-radial hole, 2.5-longitudinal long groove, 2.6-inner hole;
4-piston rod, 41-shoulder, 42-piston rod inner hole and 43-oil channel;
7-ejector rod, 7.1-cylindrical body, 7.2-O-shaped sealing ring;
3-second side piston, 5-locking nut, 6-pressing bar, 8-piston rod first sealing element, 9-piston rod second sealing element, 10-piston sealing element and 11-guide belt.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention. It is to be understood that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The piston assembly with the locking function is installed in a cylinder barrel of a hydraulic cylinder and an air cylinder and can be locked at any position of the stroke of the hydraulic cylinder and the air cylinder. As shown in fig. 1a and fig. 1b, the piston comprises a first side piston 1, a middle piston 2, a second side piston 3, a piston rod 4, a locking nut 5, a pressing strip 6, a push rod 7, a first piston rod sealing piece 8, a second piston rod sealing piece 9, a piston sealing piece 10 and a guide belt 11. The first side piston 1 and the second side piston 3 have the same structure, are symmetrically sleeved on two sides of the piston rod 4, and are components for realizing the sealing and guiding functions of a conventional piston. In fig. 1a, the first side piston 1 is a left piston and the second side piston 3 is a right piston. The middle piston 2 is mounted on the piston rod 4 between the first side piston 1 and the second side piston 3, and is a component for realizing the piston locking function.
Since the first side piston 1 and the second side piston 3 have the same structure, the specific structure of the first side piston 1 is described herein and shown in the drawings as an example. As shown in fig. 2, a guide strip installation groove 1.1 and a piston sealing element installation groove 1.2 are formed in the outer circumferential wall of the first side piston 1, a first piston rod sealing element installation groove 1.3 is formed in the inner circumferential wall of the first side piston 1, a guide strip 11 is installed in the guide strip installation groove 1.1, a piston sealing element 10 is installed in the piston sealing element installation groove 1.2, and a first piston rod sealing element 8 is installed in the first piston rod sealing element installation groove 1.3. It goes without saying that the second side piston 3 is likewise provided with a guide strip mounting groove for mounting the guide strip 11, a piston seal mounting groove for mounting the piston seal, a piston rod first seal mounting groove for mounting the piston rod first seal.
As shown in fig. 3a and 3b, the intermediate piston 2 is a cylinder structure and has an inner hole 2.6 in clearance fit with the piston rod 4, the inner circumferential walls of both sides of the intermediate piston 2 are respectively provided with piston rod second sealing member mounting grooves 2.1 and 2.2, the piston rod second sealing member 9 is mounted in the piston rod second sealing member mounting grooves 2.1 and 2.2, the inner circumferential wall of the middle part of the intermediate piston 2 is provided with an oil storage ring groove 2.3, the diameter of the oil storage ring groove 2.3 is larger than that of the inner hole 2.6, the outer circumferential wall of the intermediate piston 2 is radially and uniformly provided with a plurality of longitudinal long grooves 2.5, the inner circumferential wall of the intermediate piston 2 is radially and inwardly provided with a plurality of radial holes 2.4 in each longitudinal long groove 2.5, and the oil storage ring groove 2.3 is communicated with the longitudinal long grooves 2.5 through the radial holes 2.4.
The compression strip 6 is installed in the longitudinal long groove 2.5 of the middle piston 2 and is in clearance fit with the longitudinal long groove 2.5 in the width direction. As shown in fig. 4, the bottom surface of the bead 6 is a plane, which is attached to the flat bottom surface of the longitudinal elongated slot 2.5, the top surface of the bead 6 is an arc surface, which is in clearance fit with the inner wall of the cylinder barrel, and the arc radius of the arc surface is the same as the radius of the cylinder barrel of the hydraulic cylinder and the cylinder barrel of the piston assembly with the locking function.
The carrier rod 7 is mounted in a radial bore 2.4 of the intermediate piston 2. As shown in fig. 5, the ejector rod 7 includes a cylindrical body 7.1, a seal ring installation groove is processed on the outer circumferential wall of the cylindrical body 7.1, and an O-ring 7.2 is installed in the seal ring installation groove.
Further, as shown in fig. 1a, the piston rod 4 is provided with a shoulder 41 at one end thereof, and is opened at the center thereof with a rod bore 42, and a plurality of oil passages 43 communicate between the rod bore 42 and the oil gallery ring groove 2.3 of the intermediate piston 2. The first side piston 1, the middle piston 2 and the second side piston 3 are sequentially arranged on the piston rod 4, one side of the first side piston is positioned by the convex shoulder 41, and the other side of the first side piston is fixed by the locking nut 5 screwed on one end of the piston rod 4, which is not provided with the convex shoulder.
When the hydraulic cylinder and the air cylinder are required to stop at any position of the stroke, the piston assembly with the locking function, which is arranged in the cylinder barrel of the hydraulic cylinder and the air cylinder, realizes locking in the following way: external control oil enters the oil storage ring groove 2.3 of the middle piston 2 through the inner hole 42 of the piston rod and the oil duct 43, the ejector rod 7 arranged in the radial hole 2.4 is pushed by oil pressure, the ejector rod 7 is pressed and arranged on the pressing strip 6 in the longitudinal long groove 2.5, the pressing strip 6 is pressed and leaned against the inner wall of the cylinder barrel along the radial direction, and therefore the locking function of the piston is achieved through pressing force between the pressing strip 6 and the inner wall of the cylinder barrel. The magnitude of the locking force can be adjusted by adjusting the magnitude of the oil pressure of the external control oil.
The piston assembly with locking function of the present invention will be described below with reference to specific embodiments.
Examples
A hydraulic cylinder is matched with certain equipment to realize the lifting adjustment process. Hydraulic cylinder parameters: the cylinder diameter is 100mm, the rod diameter is 56mm, and the lifting load is 30kN. It is required that the cylinder remains locked at any position of the cylinder near the end of travel.
Considering that the hydraulic cylinder can be telescopically adjusted at any position near the end of stroke when working, the hydraulic cylinder needs to be kept at the position when the hydraulic cylinder stops moving under load, although short-time position locking can be realized by means of sealing of a piston of the hydraulic cylinder, internal leakage of the piston is increased under the continuous action of the load, internal leakage of hydraulic system components also occurs, the hydraulic cylinder slowly retracts, and therefore the requirement of process control cannot be met, and therefore the hydraulic cylinder needs to be provided with a locking mechanism capable of realizing locking at any position of the stroke.
For this reason, the hydraulic cylinder is provided with the piston assembly with the locking function of the embodiment of the invention, so that the process control requirement that the hydraulic cylinder is kept locked at any position of the hydraulic cylinder close to the stroke end can be realized.
Referring to fig. 1a, 1b, 2, 3a, 3b, 4 and 5, a piston assembly with a locking function according to an embodiment of the present invention includes a first side piston 1, a middle piston 2, a second side piston 3, a piston rod 4, a locking nut 5, a bead 6, a plunger 7, a piston rod first seal 8, a piston rod second seal 9, a piston seal 10, and a guide band 11. The first side piston 1 and the second side piston 3 are symmetrically sleeved on two sides of the piston rod 4, and are used as components for realizing the sealing and guiding functions of a conventional piston. The intermediate piston 2 is mounted on the piston rod 4 between the first side piston 1 and the second side piston 3 as a part for performing a piston locking function. The first side piston 1, the middle piston 2 and the second side piston 3 are sequentially arranged on the piston rod 4, one side of the first side piston is positioned by a convex shoulder 41 of the piston rod 4, and the other side of the first side piston is fixed by a locking nut 5 screwed on one end of the piston rod 4, which is not provided with the convex shoulder.
The middle piston 2 is provided with 16 longitudinal long grooves 2.5, each longitudinal long groove 2.5 is communicated with the oil storage ring groove 2.3 through 9 radial holes 2.4, a pressing strip 6 is arranged in each longitudinal long groove 2.5, 16 pressing strips 6 are arranged in total, an ejector rod 7 is arranged in each radial hole 2.4, 9 ejector rods 7 are arranged in total, and the pressing strips 6 are pushed by the 9 ejector rods 7 to tightly press the inner wall of the cylinder barrel. The inner bore 2.6 of the intermediate piston 2 is in clearance fit with the piston rod 4. A piston rod second seal 9 is mounted in the piston rod second seal mounting grooves 2.1,2.2 of the intermediate piston 2.
When the hydraulic cylinder moves to a required position, the hydraulic system lifting control loop stops supplying oil to the hydraulic cylinder, and the large cavity of the hydraulic cylinder has internal pressure due to the action of external load. Control oil from a hydraulic system enters an oil storage ring groove 2.3 of the middle piston 2 through a piston rod inner hole 42 and an oil passage 43, the lower surface of an ejector rod 7 installed in a radial hole 2.4 is pushed through oil pressure, the ejector rod 7 is pushed to move outwards in the radial hole 2.4, the upper portion of the ejector rod 7 is in contact with the bottom surface of the pressing strip 6, therefore, the pressing strip 6 is pushed to move outwards in the longitudinal long groove 2.5, the arc surface of the pressing strip 6 is in contact with the inner wall of the cylinder barrel and generates radial pressure, and therefore friction force is generated between the pressing strip 6 and the inner wall of the cylinder barrel, the whole piston assembly is locked, and locking of a hydraulic cylinder and an air cylinder at any position of a stroke is achieved.
In the piston assembly with the locking function according to the embodiment of the present invention, the material of the bead 6 is a polyamide (nylon 66) bar. The friction coefficient of the material and steel is large, the static friction coefficient is 0.37, the dynamic friction coefficient is 0.34, and the compressive strength is 79Mpa. When the oil pressure of the external control oil is 15MPa, the pressing force of the pressing strip 6 made of the material on the inner wall of the hydraulic cylinder can reach 108kN, the friction can reach 37.5kN, and the design requirements and the process control requirements are completely met.
It should be understood that, in the above description and the drawings, the number of the parts is only used for conveniently describing the piston assembly with the locking function of the present invention, and when the piston assembly is applied to actual working conditions, the number of the compression strips 6 of the intermediate piston 2 can be adjusted and changed according to specific requirements, for example, the number of the push rods 7 can be increased or decreased correspondingly, and the length of the compression strips 6 and the distribution number of the push rods 7 can also be increased or decreased.
It is noted that, herein, relational terms such as "first," "second," and the like may be used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities. Also, the terms "comprises" or any other variation thereof are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Meanwhile, the term "connected" and the like used herein should be broadly interpreted as being either fixedly connected or detachably connected, directly connected, or indirectly connected through intermediate members. In addition, "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like are referred to herein as being placed in the state shown in the drawings.
It should be noted that, the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or alterations do not depart from the spirit of the invention.
Claims (8)
1. The utility model provides a piston assembly with locking function, its characterized in that, piston assembly includes first side piston, middle piston, second side piston, piston rod, layering, ejector pin, the first sealing member of piston rod, piston rod second sealing member, piston seal, guidance tape, wherein:
the first side piston and the second side piston have the same structure and are symmetrically sleeved on two sides of the piston rod, and the middle piston is arranged on the piston rod and is positioned between the first side piston and the second side piston;
the first side piston and the second side piston are respectively provided with a guide belt installation groove for installing a guide belt, a piston sealing element installation groove for installing a piston sealing element and a piston rod first sealing element installation groove for installing a piston rod first sealing element;
the middle piston is provided with an inner hole in clearance fit with the piston rod, a piston rod second sealing element mounting groove for mounting a piston rod second sealing element is processed on the inner circumferential wall of the middle piston, an oil storage ring groove is further processed on the inner circumferential wall of the middle piston, a plurality of longitudinal long grooves are processed on the outer circumferential wall of the middle piston, a plurality of radial holes are processed on each longitudinal long groove on the inner circumferential wall of the middle piston in the radial direction inwards, and the oil storage ring groove is communicated with the longitudinal long grooves through the radial holes;
the pressing bar is arranged in a longitudinal elongated slot of the middle piston, and the ejector rod is arranged in a radial hole of the middle piston;
one end of the piston rod is provided with a convex shoulder, the center of the piston rod is provided with a piston rod inner hole, and a plurality of oil ducts are communicated between the piston rod inner hole and the oil storage ring groove of the middle piston.
2. The piston assembly having a locking function according to claim 1, wherein the guide band mounting groove and the piston seal mounting groove of the first side piston are provided on an outer circumferential wall of the first side piston, and the piston rod first seal mounting groove of the first side piston is provided on an inner circumferential wall of the first side piston.
3. The piston assembly having a locking function according to claim 2, wherein the guide band mounting groove and the piston seal mounting groove of the second side piston are provided on an outer circumferential wall of the second side piston, and the piston rod first seal mounting groove of the second side piston is provided on an inner circumferential wall of the second side piston.
4. The piston assembly with locking function according to claim 1, wherein a piston rod second seal mounting groove is provided on each of inner circumferential walls of both sides of the intermediate piston, an oil reservoir groove is provided on an inner circumferential wall of a middle portion of the intermediate piston, a diameter of the oil reservoir groove is larger than a diameter of the inner bore, and a plurality of longitudinal long grooves are radially and uniformly distributed on an outer circumferential wall of the intermediate piston.
5. The piston assembly with the locking function as claimed in claim 1, wherein the bead is in clearance fit with the longitudinal long groove in the width direction, the bottom surface of the bead is a plane and is attached to the flat bottom surface of the longitudinal long groove, the top surface of the bead is a circular arc surface and is in clearance fit with the inner wall of the cylinder barrel of the hydraulic cylinder or the air cylinder provided with the piston assembly, and the circular arc radius of the circular arc surface is the same as the radius of the cylinder barrel.
6. The piston assembly with locking function according to claim 5, wherein the carrier rod includes a cylindrical body, a packing installation groove is formed on an outer circumferential wall of the cylindrical body, and an O-ring is installed in the packing installation groove.
7. The piston assembly with locking function according to claim 6, wherein the first side piston, the middle piston, and the second side piston are sequentially mounted on the piston rod, one side is positioned by the shoulder, and the other side is fixed by a locking nut screwed on the end of the piston rod where the shoulder is not provided.
8. The piston assembly with the locking function as claimed in any one of claims 1 to 7, wherein the press strip is made of polyamide bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010741279.4A CN112081792B (en) | 2020-07-29 | 2020-07-29 | Piston assembly with locking function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010741279.4A CN112081792B (en) | 2020-07-29 | 2020-07-29 | Piston assembly with locking function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112081792A CN112081792A (en) | 2020-12-15 |
| CN112081792B true CN112081792B (en) | 2022-11-08 |
Family
ID=73735156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010741279.4A Active CN112081792B (en) | 2020-07-29 | 2020-07-29 | Piston assembly with locking function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112081792B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4471686A (en) * | 1982-05-17 | 1984-09-18 | Greenco Corporation | Double acting piston and cylinder assembly |
| US5079997A (en) * | 1989-07-27 | 1992-01-14 | Korea Institute Of Science And Technology | Piston seal device for a pneumatic cylinder |
| WO2005054686A1 (en) * | 2003-12-04 | 2005-06-16 | Razorback Vehicles Corporation Limited | A pneumatic or hydraulic cylinder lock assembly |
| CN202451514U (en) * | 2012-01-12 | 2012-09-26 | 四川长江液压件有限责任公司 | Mechanical locking hydraulic cylinder |
| CN106286464A (en) * | 2016-09-02 | 2017-01-04 | 武汉市天毅达测控科技有限公司 | A kind of end mechanical self-locking hydraulic cylinder of band buffering |
| CN207212825U (en) * | 2017-08-08 | 2018-04-10 | 华南理工大学 | A kind of end control type internal-expansion type mechanical interlocking hydraulic jack |
| CN109281889A (en) * | 2018-11-09 | 2019-01-29 | 湖南师范大学 | A kind of combination sealing arrangement and hydraulic cylinder for hydraulic cylinder piston |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201101787D0 (en) * | 2011-02-02 | 2011-03-16 | Norgren Ltd C A | Locking pneumatic piston |
-
2020
- 2020-07-29 CN CN202010741279.4A patent/CN112081792B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4471686A (en) * | 1982-05-17 | 1984-09-18 | Greenco Corporation | Double acting piston and cylinder assembly |
| US5079997A (en) * | 1989-07-27 | 1992-01-14 | Korea Institute Of Science And Technology | Piston seal device for a pneumatic cylinder |
| WO2005054686A1 (en) * | 2003-12-04 | 2005-06-16 | Razorback Vehicles Corporation Limited | A pneumatic or hydraulic cylinder lock assembly |
| CN202451514U (en) * | 2012-01-12 | 2012-09-26 | 四川长江液压件有限责任公司 | Mechanical locking hydraulic cylinder |
| CN106286464A (en) * | 2016-09-02 | 2017-01-04 | 武汉市天毅达测控科技有限公司 | A kind of end mechanical self-locking hydraulic cylinder of band buffering |
| CN207212825U (en) * | 2017-08-08 | 2018-04-10 | 华南理工大学 | A kind of end control type internal-expansion type mechanical interlocking hydraulic jack |
| CN109281889A (en) * | 2018-11-09 | 2019-01-29 | 湖南师范大学 | A kind of combination sealing arrangement and hydraulic cylinder for hydraulic cylinder piston |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112081792A (en) | 2020-12-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4792128A (en) | No grow gas spring | |
| RU2722581C1 (en) | Hydraulic (pneumatic) device and method of piston assembly manufacturing | |
| EP2857711B1 (en) | Overtravel pressure relief for a gas spring | |
| US20060290037A1 (en) | Gas spring | |
| US4326402A (en) | Stock lifter for progressive dies | |
| EP0464386B1 (en) | Gas spring | |
| EP1628037B1 (en) | Low impact gas spring | |
| CA2222799C (en) | Pneumatic spring | |
| EP1626194B1 (en) | Low impact gas spring | |
| CA2639191C (en) | Gas spring with guide | |
| KR20130086185A (en) | Gas spring | |
| US20100230875A1 (en) | Delay return gas spring | |
| US5823513A (en) | Delay return gas spring | |
| CA1212392A (en) | Pneumatic spring counterbalance having improved damping structure | |
| EP0337156B1 (en) | Die spring construction | |
| CN112081792B (en) | Piston assembly with locking function | |
| CN107830098B (en) | Damper for pantograph and method for adjusting maximum damping force of stretching of damper | |
| US4153145A (en) | Heavy duty hydraulic shock absorber | |
| CN112013072B (en) | Single-cylinder magnetorheological damper and vehicle | |
| CN107839489B (en) | Pantograph | |
| CN216407346U (en) | Self-adaptive sealing device of hydraulic cylinder | |
| US20170306991A1 (en) | Rod-less cylinder equipped with guide mechanism | |
| RU2737877C1 (en) | Piston assembly and hydraulic (pneumatic) device | |
| GB2260724A (en) | Apparatus and method for cushioning movement of a member in a press | |
| CN114017414B (en) | Hydraulic cylinder self-adaptive sealing device and self-adaptive adjusting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |