CN111594509B - Hydraulic cylinder capable of automatically adjusting piston clearance - Google Patents
Hydraulic cylinder capable of automatically adjusting piston clearance Download PDFInfo
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- CN111594509B CN111594509B CN202010567491.3A CN202010567491A CN111594509B CN 111594509 B CN111594509 B CN 111594509B CN 202010567491 A CN202010567491 A CN 202010567491A CN 111594509 B CN111594509 B CN 111594509B
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- expansion sleeve
- plunger rod
- cylinder body
- expansion
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- 238000007789 sealing Methods 0.000 claims abstract description 24
- 210000004907 gland Anatomy 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 5
- 230000003068 static effect Effects 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 2
- 230000007306 turnover Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 19
- 238000009434 installation Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000010727 cylinder oil Substances 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 description 7
- 239000010720 hydraulic oil Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008602 contraction Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
- F15B15/1461—Piston rod sealings
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The invention relates to a hydraulic cylinder capable of automatically adjusting a piston gap, which comprises a plunger rod and a cylinder body sleeved on the plunger rod, wherein a guide sleeve used for guiding the plunger rod to move is embedded on the inner side of the cylinder body, a piston is fixedly arranged at one end of the plunger rod, which is positioned in the cylinder body, a rod cavity and a rodless cavity are formed in the cylinder body, the other end of the plunger rod protrudes out of the cylinder body, a fixed casting disc and a variable load are sequentially arranged at the other end of the plunger rod, a hydraulic cylinder oil inlet and outlet are formed in one side of the cylinder body, which corresponds to the rod cavity, a sealing gland sleeved with the plunger rod is fixedly arranged at the open end of the cylinder body, an expansion sleeve is arranged on the inner side surface of the piston, which is close to the cylinder body, an expansion power cavity capable of expanding the expansion sleeve towards the inner side surface of the cylinder body is arranged on the inner side of the expansion sleeve, and an expansion sleeve oil inlet used for communicating the rodless cavity and the expansion power cavity is further formed on the bottom surface of the piston. The invention can effectively avoid the vibration or creeping of the plunger rod, has low manufacturing cost, low installation and transformation difficulty, no special requirement on working conditions, no maintenance and high reliability.
Description
Technical Field
The invention relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder capable of automatically adjusting a piston clearance.
Background
At present, in a hydraulic cylinder, a plunger rod reciprocates along a cylinder body, and when the hydraulic cylinder continuously descends, the situation that the hydraulic cylinder moves unstably, the friction force is unstable and the like often occurs due to the gravity impact of the plunger rod and the load mass because of the continuous change of the load on the plunger rod, so that vibration or creeping is generated, namely, the jumping type movement state of the hydraulic cylinder when the hydraulic cylinder stops and moves occurs, and the phenomenon is easy to occur particularly when the hydraulic cylinder moves at a low speed. In order to solve the problem, a displacement sensor is usually designed on a hydraulic cylinder, a hydraulic system is designed as a servo system, the opening degree of a servo valve is adjusted through position feedback of the displacement sensor and pressure feedback of a control cavity, and the flow of an outlet is controlled to be stable, so that the descending speed of a plunger rod under a variable load is realized to stably operate. Besides the high price of the long-stroke linear displacement sensor, the direct cost caused by the problems of installation, fixation and support in the hydraulic cylinder is high due to the dead weight of the displacement sensor, and the servo system used as control is high in price and high in subsequent maintenance cost, has high requirements on working condition environment and oil cleanliness, so that the defects of troublesome installation, high cost, inapplicability to various working environments and the like are caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a hydraulic cylinder capable of automatically adjusting a piston clearance. The piston clearance can realize real-time self-adjustment, can effectively avoid vibration or creeping of the plunger rod, has low manufacturing cost and low installation and transformation difficulty, has no special requirements on working conditions, is maintenance-free and has high reliability.
The technical aim of the invention is realized by the following technical scheme: the utility model provides a but pneumatic cylinder in self-adjusting piston clearance, includes plunger rod and cover establishes the barrel on the plunger rod, the inboard dress of barrel is equipped with the uide bushing that is used for guiding the plunger rod motion, the plunger rod is located the one end of barrel and has set firmly the piston, the piston is used for making the inside of barrel is formed with pole chamber and rodless chamber, the other end protrusion barrel of plunger rod just installs fixed casting dish and variable load in proper order, the pneumatic cylinder business turn over hydraulic fluid port has been seted up to one side that the barrel corresponds pole chamber, the open end of barrel still set firmly the gland with the plunger rod suit, the piston is close to be equipped with the inflation cover on the medial surface of barrel, the inflation cover inboard is equipped with the inflation power chamber that enables inflation cover to barrel medial surface inflation, the inflation cover oil inlet that is used for the intercommunication rodless chamber and inflation power chamber has still been seted up to the bottom surface of piston.
Further, the outer edge of the expansion sleeve is larger than the outer edge of the piston, the initial clearance between the expansion sleeve and the inner side of the cylinder body is 1-1.5mm, and after the expansion sleeve is maximally expanded, the clearance between the expansion sleeve and the cylinder body is more than 0.08 mm.
Further, a pressing plate for limiting the expansion sleeve is arranged on the bottom surface of the piston.
Further, the width of the expansion power cavity is 0.75-0.8 times of the width of the expansion sleeve, and the depth of the expansion power cavity is 0.5-1mm.
Further, the two ends of the piston, which are positioned on the expansion power cavity and the expansion sleeve contact surface, are respectively provided with an expansion sleeve left seal and an expansion sleeve right seal.
Further, the left expansion sleeve seal and the right expansion sleeve seal are both large-section-diameter polyurethane material seals.
Further, the number of the oil inlets of the expansion sleeve is at least 3 and is uniformly distributed around the central axis of the piston.
Further, the cylinder body comprises a cylinder head and a cylinder body which are detachably connected, a cylinder body static seal is arranged at the joint of the cylinder head and the cylinder body, and a piston side static seal is arranged between the piston and the plunger rod.
Further, a plunger rod seal is arranged between the sealing gland and the guide sleeve, and a gland static seal and a dust ring are arranged on the sealing gland.
Further, the expansion sleeve is made of alloy quenched and tempered steel materials.
In summary, the invention has the following beneficial effects:
1. The piston clearance can realize real-time self-adjustment, can effectively avoid vibration or creeping of the plunger rod, has low manufacturing cost and low installation and transformation difficulty, has no special requirements on working conditions, is maintenance-free and has high reliability. Because of the existence of pressure difference at two sides of the piston, when the pressure of the right side of the piston is larger than that of the left side, high-pressure oil at the right side enters the expansion power cavity through the oil inlet of the expansion sleeve and acts on the inner surface of the expansion sleeve to generate external expansion, so that the gap between the cylinder body and the piston is reduced; conversely, when the pressure on the two sides of the piston is reduced, the pressure on the inner surface of the gap expansion sleeve is reduced, so that the inner contraction is generated, and the gap between the cylinder body and the piston is increased. Therefore, the device can self-regulate according to the clearance between the piston and the cylinder body, basically stabilizes the action of pressure difference change to change the flow speed of the oil volume, and avoids vibration or creeping caused by uneven stress of the plunger rod due to the influence of oil pressure change.
2. The material, the type and the thickness of the expansion sleeve arranged on the piston are determined according to the working condition of the hydraulic cylinder and the control precision requirement of a hydraulic system, and the expansion sleeve and the cylinder body are not allowed to be in direct contact under any condition, so that the hydraulic cylinder is burnt or blocked due to the direct contact, the initial gap is generally 1mm-1.5mm according to the diameter of the hydraulic cylinder plunger, and a gap of more than 0.08mm is needed between the gap expansion sleeve and the cylinder body after the maximum expansion value is reached.
3. The expansion sleeve can be arranged on the piston in an embedded manner, and a pressing plate can be arranged on the bottom surface of the piston for pressing so as to limit the expansion direction of the expansion sleeve and prevent the expansion sleeve from being separated from the piston to cause blockage for the convenience of installation and replacement.
4. The expansion sleeve has a certain proper proportion relative to the width of the expansion power cavity, the too large expansion sleeve width can cause the too good gap sealing effect, the plunger rod is static or crawl, and the too poor gap sealing effect causes the failure of gap sealing control.
5. The right seal of the expansion sleeve and the left seal of the expansion sleeve are made of materials, so that the situation that the sealing element is extruded and damaged due to the increase of the gap after the expansion sleeve is expanded can be prevented.
6. The oil inlets of the expansion sleeve are uniformly distributed in 4 groups, so that the uniformity of expansion or contraction outside the expansion sleeve is ensured.
7. The static seal arranged in the device can effectively prevent the internal leakage of the hydraulic cylinder and ensure the good operation of the hydraulic cylinder.
Drawings
FIG. 1 is a schematic diagram of a hydraulic cylinder with self-adjusting piston clearance according to the present invention;
FIG. 2 is a cross-sectional view of section A-A of FIG. 1;
FIG. 3 is an enlarged schematic view at B in FIG. 1;
Fig. 4 is an enlarged schematic view at C in fig. 1.
In the figure: 1. a variable load; 2. fixing the casting plate; 3. a sealing gland; 4. a cylinder head; 5. a guide sleeve; 6. a plunger rod; 7. a cylinder; 8. a piston; 9. an expansion sleeve; 10. a pressing plate; 11. an oil inlet of the expansion sleeve; 12. right sealing of the expansion sleeve; 13. an expansion power chamber; 14. left sealing of the expansion sleeve; 15. static sealing of the piston side; 16. an oil inlet and outlet of the hydraulic cylinder; 17. static sealing of the cylinder; 18. sealing the plunger rod; 19. sealing the gland; 20. a dust ring.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
It should be noted that the terms "upper", "lower", and the like referred to herein are all used for convenience of description only and should not be construed as limiting the technical solution.
As shown in fig. 1-4, a hydraulic cylinder capable of self-adjusting a piston gap comprises a plunger rod 6 and a cylinder body sleeved on the plunger rod 6, wherein a guide sleeve 5 for guiding the plunger rod 6 to move is embedded in the inner side of the cylinder body, a piston 8 is fixedly arranged at one end of the plunger rod 6 positioned in the cylinder body, the piston 8 is used for enabling the inside of the cylinder body to be formed with a rod cavity and a rodless cavity, the other end of the plunger rod 6 protrudes out of the cylinder body and is sequentially provided with a fixed casting plate 2 and a variable load 1, one side of the cylinder body corresponding to the rod cavity is provided with a hydraulic cylinder oil inlet and outlet 16, the open end of the cylinder body is fixedly provided with a sealing gland 3 sleeved with the plunger rod 6, an expansion sleeve 9 is arranged on the inner side surface of the piston 8 close to the cylinder body, an expansion power cavity 13 capable of expanding the expansion sleeve 9 towards the inner side surface of the cylinder body is arranged on the inner side of the expansion sleeve 9, and an expansion sleeve oil inlet 11 for communicating the rodless cavity and the expansion power cavity 13 is further arranged on the bottom surface of the piston 8. The invention is used for improving the plunger type hydraulic cylinder, so that the clearance of the piston 8 can be self-adjusted in real time, the vibration or creeping of the plunger rod 6 can be effectively avoided, the manufacturing cost is low, the installation and transformation difficulties are low, no special requirement is required for working conditions, and the invention is maintenance-free and has high reliability.
The large pressure changes across the piston 8 can result in rattling or creeping of the plunger rod 6 due to uneven forces. According to the invention, an expansion power cavity 13 is formed through a gap between the piston 8 and the expansion sleeve 9, as shown in fig. 1, due to the existence of pressure difference at two sides of the piston 8, when the pressure difference at the right side of the piston 8 is larger than that at the left side, high-pressure oil at the right side enters the expansion power cavity 13 through an oil inlet 11 of the expansion sleeve and acts on the inner surface of the expansion sleeve 9 to generate external expansion, so that the gap between a cylinder body and the piston 8 is reduced, the instantaneous hydraulic oil flow speed is slowed down, then the expansion sleeve 9 is slowly stressed and restored in the process, the flow speed tends to be stable, the self-adjusting and stabilizing effects are achieved, and the phenomenon that the pressure difference suddenly becomes large to possibly increase the flow speed of oil entering a rod cavity without a rod cavity is avoided; on the contrary, when the pressure on two sides of the piston 8 is reduced and the pressure on the left side of the piston 8 is greater than that on the right side, the pressure on the inner surface of the gap expansion sleeve 9 is reduced, so that internal contraction is generated, the gap between the cylinder body and the piston 8 is increased, more hydraulic oil can be contained to pass through the gap, the flow speed is instantaneously increased, the expansion sleeve 9 is gradually returned in the process, and the effect that the pressure difference is reduced, and the flow speed of oil entering a rodless cavity possibly increases is basically stabilized. Therefore, the device can self-regulate according to the clearance between the piston and the cylinder body, and stabilize the flow velocity of the clearance in the whole process, so that the pressures at two sides of the piston 8 can normally operate, uneven stress of the plunger rod 6 caused by abrupt change of the pressure difference at two sides can be avoided, and the phenomena of vibration or creeping of the hydraulic cylinder can be effectively prevented.
In this embodiment, the outer edge of the expansion sleeve 9 is larger than the outer edge of the piston 8, and the material, kind and thickness of the expansion sleeve 9 mounted on the piston 8 are determined according to the working condition of the hydraulic cylinder and the control precision requirement of the hydraulic system, and since the expansion sleeve 9 is not allowed to be in direct contact with the inner side of the cylinder body in any case, the direct contact can cause the hydraulic cylinder to burn or block, and according to the diameter of the cylinder plunger, the initial gap is generally 1mm-1.5mm, and after the maximum expansion value, a gap of more than 0.08mm is needed between the expansion sleeve 9 and the cylinder body.
In this embodiment, a pressing plate 10 for limiting the expansion sleeve 9 is provided on the bottom surface of the piston 8. The expansion sleeve 9 can be installed on the piston 8 in an embedded manner, namely, only the piston 8 is arranged as a whole structure, and a groove is formed for installing the expansion sleeve 9 and leaving an expansion power cavity 13. In order to facilitate installation and replacement, a pressing plate 10 can be arranged on the bottom surface of the piston to press, and the pressing plate 10 is detachably connected with the piston 8 to limit the expansion direction of the expansion sleeve 9 and prevent the expansion sleeve from being separated from the piston 8 to cause blockage.
In this embodiment, the width of the expansion power chamber 13 is 0.75-0.8 times the width of the expansion sleeve 9, and the depth of the expansion power chamber 13 is 0.5-1mm. The expansion sleeve 9 has a certain proper proportion relative to the width of the expansion power cavity 13, and too large a width of the expansion sleeve 9 can cause too good clearance sealing effect, the plunger rod is static or crawl, and too poor clearance sealing effect can cause the clearance sealing control to be invalid. The two ends of the piston 8, which are positioned at the contact surface of the expansion power cavity 13 and the expansion sleeve 9, are respectively provided with an expansion sleeve left seal 14 and an expansion sleeve right seal 12. The left seal 14 of the expansion sleeve and the right seal 12 of the expansion sleeve play a role in sealing against leakage of hydraulic oil and fixing of the expansion sleeve 9. The left seal 14 of the expansion sleeve and the right seal 12 of the expansion sleeve are both made of polyurethane material with large section diameter, so that the situation that the seal is extruded and damaged due to the increase of a gap after the expansion sleeve is expanded can be effectively prevented.
In this embodiment, the number of the expansion shell oil inlets 11 is 4 and evenly distributed around the central axis of the piston 8. The aperture of the oil inlet 11 of each expansion shell cannot be set too large, and only serves to guide hydraulic oil into the expansion power chamber 13, so that a plurality of expansion shells are required to ensure the uniformity of expansion or contraction of the expansion shell 9. The expansion sleeve 9 is made of alloy quenched and tempered steel materials. The alloy quenched and tempered steel is medium carbon alloy structural steel subjected to quenching, high-temperature tempering and the like, is mainly used in various loads such as working environments of torsion, bending, impact and the like, has complex stress, and is an important part with good comprehensive mechanical properties. The cylinder body comprises a cylinder head 4 and a cylinder body 7 which are detachably connected, processing of the cylinder head 4 and the cylinder body 7 is facilitated, follow-up operations such as replacement of internal parts and regular maintenance are facilitated, a cylinder body static seal 17 is arranged at the joint of the cylinder head 4 and the cylinder body 7, a piston side static seal 15 is arranged between a piston 8 and a plunger rod 9, a plunger rod seal 18 is arranged between a sealing gland 3 and a guide sleeve 5, and a gland static seal 19 and a dust ring 20 are arranged on the sealing gland 3. The function of each sealing ring is to restrict the infiltration of hydraulic oil, and the plunger type hydraulic cylinder is used for high-pressure oil when working especially, effectively avoids hydraulic oil to flow to other places and causes extravagant or influence the normal work of pneumatic cylinder.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (8)
1. The utility model provides a but pneumatic cylinder in self-adjusting piston clearance, includes plunger rod (6) and the barrel of cover on plunger rod (6), the barrel inboard inlays and is equipped with uide bushing (5) that are used for guiding plunger rod (6) motion, the one end that plunger rod (6) are located the barrel has set firmly piston (8), piston (8) are used for making the inside of barrel is formed with pole chamber and rodless chamber, the other end protrusion barrel of plunger rod (6) just installs fixed casting dish (2) and variable load (1) in proper order, hydraulic cylinder business turn over hydraulic fluid port (16) have been seted up to one side of barrel corresponding pole chamber, the open end of barrel still has set firmly gland (3) with plunger rod (6) suit, characterized in that, piston (8) are close to be equipped with expansion sleeve (9) on the medial surface of barrel, expansion sleeve (9) inboard is equipped with can make expansion power chamber (13) of expansion sleeve (9) to barrel medial surface, the bottom surface of piston (8) has still seted up and has been used for communicating the sleeve inlet (11) of rodless chamber and expansion power chamber (13);
A plunger rod seal (18) is arranged between the sealing gland (3) and the guide sleeve (5), and a gland static seal (19) and a dust ring (20) are arranged on the sealing gland (3);
The expansion sleeve (9) is made of alloy quenched and tempered steel materials.
2. A hydraulic cylinder with self-adjustable piston clearance according to claim 1, characterized in that the outer edge of the expansion sleeve (9) is larger than the outer edge of the piston (8), the initial clearance between the expansion sleeve (9) and the inner side of the cylinder body is 1-1.5mm, and the clearance between the expansion sleeve (9) and the cylinder body after the expansion sleeve (9) is maximally expanded is more than 0.08 mm.
3. A hydraulic cylinder with self-adjustable piston gap according to claim 1, characterized in that the bottom surface of the piston (8) is provided with a pressure plate (10) for limiting the expansion sleeve (9).
4. A hydraulic cylinder with self-adjustable piston gap according to claim 1 or 2 or 3, characterized in that the width of the expansion power chamber (13) is 0.75-0.8 times the width of the expansion sleeve (9), and the depth of the expansion power chamber (13) is 0.5-1mm.
5. A hydraulic cylinder with self-adjustable piston clearance according to claim 4, characterized in that the two ends of the piston (8) at the contact surface of the expansion power chamber (13) and the expansion sleeve (9) are respectively provided with an expansion sleeve left seal (14) and an expansion sleeve right seal (12).
6. A hydraulic cylinder with self-adjusting piston clearance according to claim 5, characterized in that the left expansion sleeve seal (14) and the right expansion sleeve seal (12) are both large section diameter polyurethane seals.
7. A hydraulic cylinder with self-adjustable piston clearance according to claim 1, characterized in that the number of expansion sleeve oil inlets (11) is at least 3 and evenly distributed around the central axis of the piston (8).
8. A hydraulic cylinder with self-adjustable piston gap according to claim 1, characterized in that the cylinder body comprises a cylinder head (4) and a cylinder body (7) which are detachably connected, a cylinder body static seal (17) is arranged at the joint of the cylinder head (4) and the cylinder body (7), and a piston side static seal (15) is arranged between the piston (8) and the plunger rod (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010567491.3A CN111594509B (en) | 2020-06-19 | 2020-06-19 | Hydraulic cylinder capable of automatically adjusting piston clearance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010567491.3A CN111594509B (en) | 2020-06-19 | 2020-06-19 | Hydraulic cylinder capable of automatically adjusting piston clearance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111594509A CN111594509A (en) | 2020-08-28 |
| CN111594509B true CN111594509B (en) | 2024-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010567491.3A Active CN111594509B (en) | 2020-06-19 | 2020-06-19 | Hydraulic cylinder capable of automatically adjusting piston clearance |
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| CN212563908U (en) * | 2020-06-19 | 2021-02-19 | 韶关液压件厂有限公司 | A hydraulic cylinder with self-adjusting piston clearance |
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| DE19614505C1 (en) * | 1996-04-12 | 1997-08-21 | Festo Kg | Actuator pneumatic piston-cylinder unit |
| JP2004011789A (en) * | 2002-06-07 | 2004-01-15 | Koganei Corp | Pneumatic cylinder |
| JP4018706B2 (en) * | 2005-05-20 | 2007-12-05 | 株式会社南武 | Hydraulic cylinder device |
| CN101235837A (en) * | 2008-03-07 | 2008-08-06 | 汪立平 | Constant throttle -type amortization structure high pressure oil cylinder |
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| JP6523916B2 (en) * | 2015-10-27 | 2019-06-05 | Ｋｙｂ株式会社 | Hydraulic equipment |
| CN206159158U (en) * | 2016-10-28 | 2017-05-10 | 安徽福马汽车零部件集团有限公司 | Upset hydro -cylinder of auttombilism room |
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| CN110030225B (en) * | 2019-03-14 | 2024-03-19 | 徐州工程学院 | Hydraulic cylinder with clearance dynamic seal piston |
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| CN212563908U (en) * | 2020-06-19 | 2021-02-19 | 韶关液压件厂有限公司 | A hydraulic cylinder with self-adjusting piston clearance |
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