CN116044861B - Retractile position self-locking hydraulic cylinder - Google Patents
Retractile position self-locking hydraulic cylinder Download PDFInfo
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- CN116044861B CN116044861B CN202310339847.1A CN202310339847A CN116044861B CN 116044861 B CN116044861 B CN 116044861B CN 202310339847 A CN202310339847 A CN 202310339847A CN 116044861 B CN116044861 B CN 116044861B
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- 239000003921 oil Substances 0.000 abstract description 47
- 239000010720 hydraulic oil Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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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
- F15B15/26—Locking mechanisms
- F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions
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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
- F15B15/1409—Characterised by the construction of the motor unit of the straight-cylinder type with two or more independently movable working pistons
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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
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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
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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
- F15B15/1471—Guiding means other than in the end cap
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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
- F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
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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
- F15B15/26—Locking mechanisms
- F15B2015/268—Fluid supply for locking or release independent of actuator pressurisation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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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 discloses a retraction position self-locking hydraulic cylinder, in particular to the technical field of self-locking hydraulic cylinders, which comprises a cylinder barrel, a front end cover, a rear end cover, a lock pin, a piston with a rod, a locking piston and a locking piston spring, wherein the cylinder barrel is provided with a stepped center through hole and is provided with an oil inlet hole and an oil outlet hole. When the self-locking type hydraulic cylinder with the retraction position is unlocked, hydraulic oil can slowly enter between the locking piston and the inner wall of the piston end through the conical design of the radial conical hole, so that the pressure in the stepped hole between the piston end and the inner wall of the cylinder barrel is higher than the pressure between the locking piston and the inner wall of the piston end in the unlocking process, the pressure spring is easier to fully retract, the locking pin is ensured to fully retract in advance and closely contact with the surface of the locking piston, and the hydraulic oil can be prevented from entering between the locking pin and the locking piston, and the accurate positioning of the piston with the rod is prevented from being influenced.
Description
Technical Field
The invention relates to the technical field of self-locking hydraulic cylinders, in particular to a retraction position self-locking hydraulic cylinder.
Background
The hydraulic cylinder is used as an actuator in a hydraulic system, needs to stay at any position and can bear load force, and in order to improve the accuracy and the endurance degree of the working position of the actuator, a retracting position self-locking hydraulic cylinder is designed, and the cylinder can achieve the aim of locking through a mechanical structure of the cylinder.
The patent of the invention with the publication number of CN101852225B discloses a retraction position self-locking hydraulic cylinder which is provided with a cylinder barrel, a front end cover, a rear end cover, a lock pin, a piston with a rod, a locking piston and a locking piston spring. The cylinder barrel is provided with a central through hole, the central through hole forms a step at the rear end of the cylinder barrel, and the cylinder wall is provided with an oil inlet and outlet hole; the front end cover and the rear end cover are detachably connected with the cylinder barrel; the rod-bearing piston is arranged in the cylinder barrel, the axial lead of the rod-bearing piston is coincident with the axial lead of the cylinder barrel, the rod end of the rod-bearing piston is exposed out of the front end cover, and the piston end of the rod-bearing piston is provided with a radial through hole and an axial hole; the locking piston and the locking piston spring are arranged in an axial hole of the piston with the rod, the locking piston spring is sleeved on the outer surface of the locking piston, the tail end of the locking piston is fixedly connected with the axial hole, and the axial lead of the locking piston is coincident with the axial lead of the axial hole; the locking pin is arranged in a radial through hole of the piston with the rod, is in sliding fit with the surface of the through hole and can move along the surface of the locking piston.
The locking pin on the piston with the rod is clamped on the step formed by the stepped cylinder barrel, so that the position of the piston with the rod is fixed and is in accurate positioning, a stable and reliable state is realized, the locking pin and the piston with the rod can move along the surface of the locking piston and always keep in contact, but when the piston with the rod is unlocked, pressure oil flows between the piston end of the locking piston and the piston end of the piston with the rod, the locking piston moves backwards under the action of the pressure oil against the acting force of a spring of the locking piston, so that the pressure oil can easily enter between the locking piston and the locking pin, after the locking piston moves a certain distance, the locking pin is contracted inwards against the friction force under the action of the pressure oil and is in contact with the surface of the locking piston, and then the locking pin and the locking piston can not be tightly attached, so that the accurate positioning of the locking pin is influenced.
Disclosure of Invention
The invention aims to provide a retraction position self-locking hydraulic cylinder, which aims to solve the problems that when the self-locking hydraulic cylinder in the prior art is unlocked, pressure oil can easily enter between a locking piston and a locking pin, when the locking piston moves for a certain distance, the locking pin is retracted inwards against friction force and contacts with the surface of the locking piston under the action of the pressure oil, and at the moment, the pressure oil is reserved between the locking piston and the locking pin, so that the locking pin cannot be tightly attached to the locking piston, and the accurate positioning of the locking pin is affected.
In order to solve the technical problems, the invention provides the following technical scheme: the self-locking type hydraulic cylinder comprises a cylinder barrel, a front end cover, a rear end cover, a lock pin, a rod piston, a locking piston and a locking piston spring, wherein the cylinder barrel is provided with a stepped center through hole and is provided with an oil inlet hole and an oil outlet hole, the axial lead of the rod piston is coincident with that of the cylinder barrel, the rod end of the rod piston is exposed out of the front end cover and is detachably connected with a piston end through a connecting piece, the middle part of the piston end of the rod piston is provided with a completely penetrating shaft through hole, one side of the connecting piece, which is close to the piston end, is provided with an axial hole, the shaft through hole is coincident with the axial lead of the axial hole, and the piston end of the rod piston is in sliding fit with the inner wall of the cylinder barrel; the locking piston is arranged in a shaft through hole at the piston end of the piston with the rod, the axial lead of the locking piston is overlapped with the axial lead of the shaft through hole, the locking piston spring is sleeved on the outer surface of a shaft rod at one end of the locking piston, the shaft rod is in sliding connection with the inner wall of the shaft hole, the locking piston spring is fixedly connected with one end of the connecting piece, the locking piston is in sliding fit with the inner wall of the shaft through hole, the piston end of the piston with the rod is provided with two radial through holes, when the cylinder does not pass in and out pressure oil in static state, the locking piston is in a balance position under the action of the locking piston spring, the locking piston presses a locking pin, the locking pin is tightly attached to the inner wall of the stepped cylinder, a chamfering part of the locking pin is positioned in the radial through hole at the front end of the piston with the rod, and the locking pin is movably embedded in the radial through hole and can move along the surface of the locking piston and keep contact all the time; the outer surface of the radial through hole is communicated with an annular groove, the outer surface of the lock pin is fixedly connected with an annular sliding part sliding in the annular groove, the outer surface of the annular sliding part is sleeved with a pressure spring, two ends of the pressure spring are respectively connected with two ends of the inner wall of the annular groove, when the piston with the rod is locked, the front end of the cylinder barrel enters pressure oil through an oil inlet hole, the rear end returns oil through an oil outlet hole, the piston with the rod moves towards the piston end direction of the piston with the rod under the action of the pressure oil, the lock pin slides along with the piston end on the inner wall surface of the cylinder barrel, when the lock pin moves to a step formed by the inner wall of the stepped cylinder barrel, the lock pin can move outwards, the lock piston continues to move towards the piston end direction under the action of the lock piston spring and the pressure oil until the lock piston props against the inner wall of the rear end cover, after 2 seconds, the right end of the inner cavity of the cylinder barrel is at a negative pressure value, the locking piston can be tightly attached to the locking pin, the locking pin on the rod-shaped piston can be clamped on a step formed by the stepped cylinder barrel against the elasticity of the pressure spring, the position of the rod-shaped piston can be fixed and can reach a precise positioning, a stable and reliable state is realized, locking is realized, when the rod-shaped piston is unlocked, the rear end of the cylinder barrel enters pressure oil through an oil outlet, the front end returns the pressure oil through the rear end of the oil inlet cylinder barrel, hydraulic oil firstly enters a stepped central through hole between the locking piston and the cylinder barrel, the locking pin overcomes the friction force under the action of the pressure oil and the pressure spring and is subjected to downward component force, the locking pin can be retracted inwards, and finally the locking piston moves backwards against the action force of the locking piston spring under the action of the pressure oil, the locking pin can be ensured to be subjected to pressure and downward component force in advance, and simultaneously the locking pin can be more easily completely contracted in advance by matching with the pressure spring and is in close contact with the surface of the locking piston, so that hydraulic oil can be prevented from entering between the locking pin and the locking piston, and the accurate positioning of the piston with the rod is prevented from being influenced.
As a preferable scheme of the retracting position self-locking hydraulic cylinder, the invention comprises the following steps: the front end cover is arranged at the front end of the cylinder barrel and is fixedly connected with the cylinder barrel through a bolt, and the rear end cover is arranged at the rear end of the cylinder barrel and is fixedly connected with the cylinder barrel through a bolt.
As a preferable scheme of the retracting position self-locking hydraulic cylinder, the invention comprises the following steps: the inner surfaces of the two ends of the connecting piece are respectively provided with internal threads which are respectively in threaded connection with the rod end and the piston end, the ends of the rod end and the piston end, which are connected with the connecting piece, are respectively provided with external threads which are matched with the internal threads, a tool is used for taking down the bolt of the rear end cover, the rear end cover is disassembled, and then the whole piston with the rod is taken out from the rear end; when the piston with the rod needs to be further disassembled and maintained, the connecting piece is held, the rod end and the piston end are respectively screwed off, so that parts of the piston with the rod are maintained and replaced respectively, if only the rod end of the piston with the rod needs to be replaced, the bolt of the front end cover is removed by using a tool, the front end cover is disassembled, then the whole cylinder barrel is held, the rod end of the piston with the rod is rotated, the screw of the piston with the rod is screwed off, and the rod end of the piston with the rod is replaced at any time.
As a preferable scheme of the retracting position self-locking hydraulic cylinder, the invention comprises the following steps: the piston end of the piston with the rod is provided with two radial conical holes, and the radial conical holes gradually decrease in size from outside to inside from the surface of the piston end.
As a preferable scheme of the retracting position self-locking hydraulic cylinder, the invention comprises the following steps: two limiting sleeves with holes are symmetrically arranged at one end, close to the oil inlet hole, of the inner wall of the cylinder barrel, and two groups of locking assemblies are symmetrically arranged at one end, close to the limiting sleeve with holes, of the piston end of the piston with the rod.
As a preferable scheme of the retracting position self-locking hydraulic cylinder, the invention comprises the following steps: the locking component comprises a bolt fixed on the piston end, the bolt is matched with a hole formed in a limiting sleeve with holes, movable grooves are formed in two sides of the surface of the bolt, the inner walls of the movable grooves are connected with arc protrusions through connecting springs, chamfer angles are formed in two ends of the holes formed in the limiting sleeve with the holes, when the rod end of a rod piston stretches forwards completely, the bolt penetrates through the holes in the limiting sleeve with the holes, in the perforation process, the arc protrusions are compressed to be connected with the springs to be contained in the movable grooves, and after the rod piston stretches completely, under the action of elasticity of the connecting springs, the arc protrusions are driven to be clamped on one side of the limiting sleeve with the holes, so that the rod end can be guaranteed to stretch to be in a stable state.
As a preferable scheme of the retracting position self-locking hydraulic cylinder, the invention comprises the following steps: the locking piston is provided as a stepped piston.
As a preferable scheme of the retracting position self-locking hydraulic cylinder, the invention comprises the following steps: the lockpin is provided with a chamfer, and the stepped center through hole is provided with a chamfer matched with the chamfer of the lockpin.
As a preferable scheme of the retracting position self-locking hydraulic cylinder, the invention comprises the following steps: the inner surface of the front end cover is provided with a guide sleeve, and the guide sleeve is used for guiding the piston with the rod.
In summary, the present invention includes at least one of the following beneficial effects:
1. when the self-locking hydraulic cylinder with the retraction position designed by the invention is unlocked, pressure oil enters from the rear part of the cylinder barrel and returns from the front part of the cylinder barrel, the hydraulic oil firstly enters into a stepped hole between the piston end and the inner wall of the cylinder barrel, then enters between the locking piston and the inner wall of the piston end through two radial conical holes arranged on the piston end, and finally the locking piston moves backwards under the action of the pressure oil against the acting force of a locking piston spring, so that the locking pin can be ensured to be subjected to pressure and force component downwards in advance, meanwhile, through the conical design of the radial conical holes, the hydraulic oil can slowly enter between the locking piston and the inner wall of the piston end, so that the pressure inside the stepped hole between the piston end and the inner wall of the cylinder barrel is greater than the pressure between the locking piston and the inner wall of the piston end in the unlocking process, thus the pressure spring is easier to fully shrink, the locking pin is ensured to fully shrink in advance and tightly contact with the surface of the locking piston, and the accurate positioning of the piston with a rod can be prevented from being influenced.
2. According to the invention, the rod end and the piston end are connected into a whole through the connecting piece in a threaded manner, when the locking piston spring in the rod piston needs to be replaced, the rear end cover is detached, the whole rod piston can be detached from the rear end, the connecting piece is held, and the rod end and the piston end are respectively screwed off, so that the locking piston spring can be detached and replaced, the problem that the locking piston spring cannot be replaced in the prior art is solved, and meanwhile, in order to ensure the use strength of the rod end and the piston end, the connecting piece, the rod end and the piston end are made of cast steel materials, and the threaded fit of the connecting piece and the rod end and the piston end is made of a precise thread processing machine.
3. The locking assembly and the limiting sleeve with the holes are matched, so that when the rod piston is in a complete extension state, the rod piston can be stably kept unchanged, the pressure born by the rod piston can be improved, the service life of the rod piston can be prolonged, when the rod end of the rod piston is completely extended forwards, a bolt penetrates through the hole in the limiting sleeve with the holes, in the perforation process, the arc bulge compression connecting spring is contained in the movable groove, and after the rod piston is completely extended, the arc bulge is driven to be clamped on one side of the limiting sleeve with the holes under the action of the elasticity of the connecting spring, so that the stable state of the rod end after extension can be ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic view of the locking mechanism of the present invention;
FIG. 3 is an enlarged view of a portion of the invention at A in FIG. 2;
FIG. 4 is a schematic view of the rod end of the present invention in a fully extended position;
FIG. 5 is an enlarged view of a portion of the invention at B in FIG. 4;
FIG. 6 is a schematic view of a first explosive construction of a piston with rod according to the present invention;
fig. 7 is a schematic view of a second explosive structure of the piston with rod according to the present invention.
Reference numerals illustrate:
reference numerals in the drawings: 1. a cylinder; 2. a front end cover; 3. a rear end cover; 4. a locking pin; 5. a piston with a rod; 51. a rod end; 52. a connecting piece; 53. a piston end; 54. a shaft through hole; 55. an axial bore; 6. a locking piston; 61. a shaft lever; 7. a locking piston spring; 8. a stepped center through hole; 9. an oil inlet hole; 10. an oil outlet hole; 11. an annular groove; 12. an annular slider; 13. a pressure spring; 14. a bolt; 15. a limit sleeve; 16. a plug pin; 17. a movable groove; 18. a connecting spring; 19. arc-shaped bulges; 20. a guide sleeve; 21. radial tapered holes.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a retraction position self-locking hydraulic cylinder.
The invention provides a self-locking hydraulic cylinder with a retraction position as shown in figures 1-7, which comprises a cylinder barrel 1, a front end cover 2, a rear end cover 3, a lock pin 4, a rod piston 5, a locking piston 6 and a locking piston spring 7, wherein the cylinder barrel 1 is provided with a stepped center through hole 8 and is provided with an oil inlet hole 9 and an oil outlet hole 10, the axial line of the rod piston 5 is overlapped with the axial line of the cylinder barrel 1, a rod end 51 of the rod piston 5 is exposed out of the front end cover 2, the rod end 51 of the rod piston 5 is detachably connected with a piston end 53 through a connecting piece 52, the rod end 51 and the piston end 53 are all made of cast steel, a completely penetrating shaft through hole 54 is formed in the middle of the piston end 53 of the rod piston 5, one side of the connecting piece 52, which is close to the piston end 53, is provided with an axial hole 55, the shaft through hole 54 is overlapped with the axial line of the axial hole 55, and the piston end 53 of the rod piston 5 is in sliding fit with the inner wall of the cylinder barrel 1; the locking piston 6 is arranged in the shaft through hole 54 of the piston end 53 of the rod-shaped piston 5, the axial lead of the locking piston 6 is coincident with the axial lead of the shaft through hole 54, the locking piston spring 7 is sleeved on the outer surface of the shaft rod 61 at one end of the locking piston 6, the shaft rod 61 is in sliding connection with the inner wall of the shaft hole 55, the locking piston spring 7 is fixedly connected with one end of the connecting piece 52, the locking piston 6 is in sliding fit with the inner wall of the shaft through hole 54, the piston end 53 of the rod-shaped piston 5 is provided with two radial through holes, the lock pin 4 is arranged in the radial through holes and is movably embedded with the radial through holes, and the lock pin 4 can move along the surface of the locking piston 6 and always keeps in contact; the outer surface of the radial through hole is communicated with an annular groove 11, the outer surface of the lock pin 4 is fixedly connected with an annular sliding part 12 sliding in the annular groove 11, the outer surface of the annular sliding part 12 is sleeved with a pressure spring 13, and two ends of the pressure spring 13 are respectively connected with two ends of the inner wall of the annular groove 11. The piston end 53 of the rod piston 5 is provided with two radial tapered bores 21, the radial tapered bores 21 tapering from the outer to the inner dimension of the surface of the piston end 53. The locking piston 6 is provided as a stepped piston. The lock pin 4 is provided with a chamfer, and the stepped center through hole 8 is provided with a chamfer matched with the chamfer of the lock pin.
When the cylinder barrel is static, pressure oil does not enter and exit, the locking piston 6 is in a balance position under the action of the locking piston spring 7, the locking piston 6 presses the locking pin 4, the locking pin 4 is clung to the inner wall of the stepped cylinder barrel 1, and the chamfer part of the locking pin 4 is positioned in a radial through hole at the front end of the piston 5 with the rod.
When the piston 5 with the rod needs to be locked, the front end of the cylinder barrel 1 is filled with pressure oil through the oil inlet hole 9, the rear end returns oil through the oil outlet hole 10, the piston 5 with the rod moves towards the piston end 53 of the piston 5 with the rod under the action of the pressure oil, the lock pin 4 slides along with the piston end 53 on the inner wall surface of the cylinder barrel 1, when the lock pin 4 moves to a step formed by the inner wall of the stepped cylinder barrel 1, the lock pin 4 can move outwards, at the moment, the lock piston 6 continues to move towards the piston end under the action of the lock piston spring 7 and the pressure oil until the lock piston 6 abuts against the inner wall of the rear end cover 3, after 2 seconds, the oil is stopped, at the moment, the right end of the inner cavity of the cylinder barrel 1 is at a negative pressure value, so that the lock piston 6 can be tightly attached to the lock pin 4, the lock pin 4 on the piston 5 with the rod overcomes the elasticity of the pressure spring 13 to be clamped on the step formed by the cylinder barrel 1, the position of the piston with the rod can be fixed, the accurate positioning can be achieved, the stable and reliable state can be locked.
When the piston 5 with the rod needs to be unlocked, the rear end of the cylinder barrel 1 enters pressure oil through the oil outlet 10, the front end of the cylinder barrel 1 returns oil through the oil inlet 9, hydraulic oil firstly enters a stepped hole between the piston end 53 and the inner wall of the cylinder barrel, then enters a space between the locking piston 6 and the inner wall of the piston end 53 through two radial conical holes 21 arranged on the piston end 53, in the process, the speed of the pressure oil entering the space between the locking piston 6 and the inner wall of the piston end 53 is reduced due to the conical design of the radial conical holes 21, so that the pressure between the piston end 53 and the inner wall of the cylinder barrel 1 is greater than the pressure between the locking piston 6 and the inner wall of the piston end 53, the pressure spring 13 is facilitated to be fully contracted in advance, the locking pin 4 is guaranteed to be in close contact with the surface of the locking piston 6 in advance, the situation that the hydraulic oil enters the space between the locking pin 4 and the locking piston 6 is influenced, and finally the locking piston 6 moves backwards under the action of the pressure oil, and the unlocking work of the piston 5 with the rod is completed.
In order to facilitate the disassembly and maintenance of the whole piston 5 with the rod, as shown in fig. 1 and fig. 6-7, the front end cover 2 is arranged at the front end of the cylinder 1 and is fixedly connected with the cylinder 1 through a bolt 14, and the rear end cover 3 is arranged at the rear end of the cylinder 1 and is fixedly connected with the cylinder 1 through the bolt 14. The inner surfaces of the two ends of the connecting piece 52 are respectively provided with internal threads which are respectively in threaded connection with the rod end 51 and the piston end 53, and the ends of the rod end 51 and the piston end 53, which are connected with the connecting piece 52, are respectively provided with external threads which are matched with the internal threads.
When each part of the whole rod piston 5 is required to be maintained and replaced, the bolts 14 of the rear end cover 3 are removed by using a tool, the rear end cover 3 is disassembled, and then the whole rod piston 5 is taken out from the rear end; when the piston 5 with the rod needs to be further disassembled and maintained, the connecting piece 52 is held, and the rod end 51 and the piston end 53 are respectively screwed off, so that parts of the piston can be maintained and replaced respectively;
if only the rod end 51 of the rod piston 5 needs to be replaced, the bolt 14 of the front end cover 2 is removed by using a tool, the front end cover 2 is detached, then the whole cylinder barrel 1 is held, the rod end 51 of the rod piston 5 is rotated, threads of the rod end 51 can be unscrewed, and the rod end 51 of the rod piston 5 can be replaced at any time conveniently.
In order to enable the rod piston 5 to be in a fully extended state and to be stable and unchanged, as shown in fig. 2-5, two limiting sleeves 15 with holes are symmetrically arranged at one end of the inner wall of the cylinder barrel 1, which is close to the oil inlet hole 9, and two groups of locking assemblies are symmetrically arranged at one end of the piston end 53 of the rod piston 5, which is close to the limiting sleeve 15 with holes. The locking component comprises a bolt 16 fixed on a piston end 53, the bolt 16 is matched with a hole arranged in a limiting sleeve 15 with a hole, movable grooves are formed in two sides of the surface of the bolt 16, the inner wall of each movable groove 17 is connected with an arc protrusion 19 through a connecting spring 18, and chamfering is arranged at two ends of the hole arranged in the limiting sleeve 15 with the hole.
When the rod end 51 of the rod piston 5 is fully extended forwards, the bolt 16 passes through the hole in the limiting sleeve 15 with the hole, in the perforation process, the circular arc bulge compression connecting spring 18 is contained in the movable groove 17, after the rod piston 5 is fully extended, the circular arc bulge 19 is driven to be clamped on one side of the limiting sleeve 15 with the hole under the elastic force of the connecting spring 18, and the stable state of the rod end 51 after extension can be ensured.
The inner surface of the front end cover 2 is provided with a guide sleeve 20, and the guide sleeve 20 is used for guiding the piston 5 with the rod.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The utility model provides a retract position self-locking pneumatic cylinder, includes cylinder (1), front end housing (2), rear end housing (3), lockpin (4), take pole piston (5), locking piston (6) and locking piston spring (7), cylinder (1) is equipped with ladder-shaped center through-hole (8), and is equipped with inlet port (9) and oil outlet port (10), the axial lead of taking pole piston (5) coincides with the axial lead of cylinder (1), the rod end (51) of taking pole piston (5) expose front end housing (2), characterized in that, the rod end (51) of taking pole piston (5) is detachably connected through connecting piece (52) and piston end (53), the piston end (53) middle part of taking pole piston (5) is equipped with the axle through-hole (54) that runs through completely, one side that connecting piece (52) is close to piston end (53) is equipped with axial hole (55), axle through-hole (54) coincides with the axial lead of axial hole (55), the piston end (53) of taking pole piston (5) is with the inner wall of cylinder (1);
the locking piston (6) is arranged in a shaft through hole (54) of a piston end (53) of the piston (5) with a rod, the axial lead of the locking piston (6) is coincident with the axial lead of the shaft through hole (54), the locking piston spring (7) is sleeved on the outer surface of a shaft lever (61) at one end of the locking piston (6), the shaft lever (61) is in sliding connection with the inner wall of the shaft hole (55), the locking piston spring (7) is fixedly connected with one end of the connecting piece (52), and the locking piston (6) is in sliding fit with the inner wall of the shaft through hole (54);
the piston end (53) of the piston (5) with the rod is provided with two radial conical holes (21), and the radial conical holes (21) gradually decrease in size from outside to inside from the surface of the piston end (53);
the piston end (53) of the piston (5) with the rod is provided with two radial through holes, the lock pin (4) is arranged in the radial through holes and movably embedded with the radial through holes, the lock pin (4) can move along the surface of the locking piston (6) and always keep in contact with the surface of the locking piston, an annular groove (11) is communicated with the outer surface of the radial through holes, an annular sliding part (12) sliding in the annular groove (11) is fixedly connected with the outer surface of the lock pin (4), a pressure spring (13) is sleeved on the outer surface of the annular sliding part (12), and two ends of the pressure spring (13) are respectively connected with two ends of the inner wall of the annular groove (11).
2. The retracting position self-locking hydraulic cylinder according to claim 1, wherein the front end cover (2) is arranged at the front end of the cylinder barrel (1) and is fixedly connected with the cylinder barrel (1) through a bolt (14), and the rear end cover (3) is arranged at the rear end of the cylinder barrel (1) and is fixedly connected with the cylinder barrel (1) through the bolt (14).
3. The retracting position self-locking hydraulic cylinder according to claim 1, wherein the inner surfaces of the two ends of the connecting piece (52) are respectively provided with internal threads which are respectively connected with the rod end (51) and the piston end (53), and the ends of the rod end (51) and the piston end (53) connected with the connecting piece (52) are respectively provided with external threads which are matched with the internal threads.
4. The retracting position self-locking hydraulic cylinder according to claim 1, wherein two limiting sleeves (15) with holes are symmetrically arranged at one end, close to the oil inlet hole (9), of the inner wall of the cylinder barrel (1), and two groups of locking components are symmetrically arranged at one end, close to the limiting sleeve (15) with holes, of a piston end (53) of the rod piston (5).
5. The retracting position self-locking hydraulic cylinder according to claim 4, wherein the locking assembly comprises a bolt (16) fixed on a piston end (53), the bolt (16) is matched with a hole arranged in a limiting sleeve (15) with holes, movable grooves (17) are formed in two sides of the surface of the bolt (16), circular arc protrusions (19) are connected to the inner wall of the movable grooves (17) through connecting springs (18), chamfer angles are formed in two ends of the hole arranged in the limiting sleeve (15) with holes, and when a rod end (51) of the piston (5) with the rod is fully extended forwards, the bolt (16) penetrates through the hole in the limiting sleeve (15) with the holes.
6. The retracting position self-locking hydraulic cylinder according to claim 1, characterized in that the locking piston (6) is provided as a stepped piston.
7. The retracting position self-locking hydraulic cylinder according to claim 1, characterized in that the locking pin (4) is provided with a chamfer, and the stepped central through hole (8) is provided with a chamfer adapted to the locking pin chamfer.
8. The retracting position self-locking hydraulic cylinder according to claim 1, wherein the inner surface of the front end cover (2) is provided with a guide sleeve (20), and the guide sleeve (20) is used for guiding the piston (5) with a rod.
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| CN202310339847.1A CN116044861B (en) | 2023-04-03 | 2023-04-03 | Retractile position self-locking hydraulic cylinder |
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| CN202310339847.1A CN116044861B (en) | 2023-04-03 | 2023-04-03 | Retractile position self-locking hydraulic cylinder |
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| CN201580920U (en) * | 2009-12-31 | 2010-09-15 | 三一汽车制造有限公司 | Crane and single-cylinder pin-type telescopic arm and pin self-locking device thereof |
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| CN108999832A (en) * | 2018-08-02 | 2018-12-14 | 重庆维庆液压机械有限公司 | A kind of self locking hydraulic cylinder |
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Address after: 264006 No. 6, Beijing South Road, development zone, Yantai City, Shandong Province Patentee after: Shandong Xinghui Hydraulic Equipment Co.,Ltd. Address before: 264006 No. 6, Beijing South Road, development zone, Yantai City, Shandong Province Patentee before: Yantai Xinghui LOUSBERG Hydraulic Machinery Co.,Ltd. |
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