CN108999830B - Hydraulic cylinder, hydraulic driving system and engineering machinery - Google Patents
Hydraulic cylinder, hydraulic driving system and engineering machinery Download PDFInfo
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- CN108999830B CN108999830B CN201810701234.7A CN201810701234A CN108999830B CN 108999830 B CN108999830 B CN 108999830B CN 201810701234 A CN201810701234 A CN 201810701234A CN 108999830 B CN108999830 B CN 108999830B
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- guide sleeve
- piston rod
- hydraulic cylinder
- piston
- hydraulic
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
- F15B15/1461—Piston rod sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to the technical field of hydraulic equipment and discloses a hydraulic cylinder, a hydraulic driving system and engineering machinery. Wherein, the hydraulic cylinder includes: a cylinder body; a piston slidably disposed inside the cylinder; a piston rod fixedly connected to the piston, wherein a first circumferential gap is formed between the piston rod and the inner wall of the cylinder body; the first guide sleeve is at least partially arranged in the first circumferential gap, and a second circumferential gap is formed between the first guide sleeve and the piston rod; the second guide sleeve is sleeved on the piston rod and at least partially positioned in the second circumferential gap, is in sealing fit with the piston rod and can radially float along with the piston rod relative to the first guide sleeve; and the cover cap covers the opening end of the cylinder body and enables the cylinder body, the first guide sleeve and the second guide sleeve to be fixed to each other along the axial direction. The invention improves the follow-up performance of the guide sleeve and the piston rod seal, improves the sealing performance of the piston rod seal, and improves the side load resistance and the low-speed dynamic performance of the hydraulic cylinder.
Description
Technical Field
The invention relates to the technical field of hydraulic equipment, in particular to a hydraulic cylinder, a hydraulic system with the hydraulic cylinder and engineering machinery with the hydraulic system.
Background
The large-diameter long-stroke hydraulic cylinder has low-speed stability requirements in the use process, namely the low-speed dynamic performance requirements are high. In the hydraulic cylinder shown in fig. 1, the piston rod is accompanied by a phenomenon of shaking and creeping or abnormal sound due to side load, fit clearance, accumulated machining error, dead weight of the piston rod and the like in the processes of low-speed extension and retraction. At present, in order to ensure that the piston rod does not shake, creep or abnormal sound when the piston rod extends and retracts at a low speed, a common method is to improve the processing precision of the oil cylinder, enlarge a fit clearance and reduce the requirement of the minimum stable operation speed of the oil cylinder. These methods have the disadvantages: 1) the precision requirement of processing equipment is high; 2) the low-speed dynamic performance of the oil cylinder is poor; 3) the sealing element has short service life.
Disclosure of Invention
The invention aims to solve the problem that a piston rod of a large-diameter long-stroke hydraulic cylinder in the prior art is accompanied with the phenomena of shaking, crawling or abnormal sound when the piston rod extends and retracts at a low speed.
In order to achieve the above object, an aspect of the present invention provides a hydraulic cylinder including:
a cylinder body;
a piston slidably disposed inside the cylinder;
the piston rod is fixedly connected to the piston and a first circumferential gap is formed between the piston rod and the inner wall of the cylinder body;
the first guide sleeve is at least partially arranged in the first circumferential gap, and a second circumferential gap is formed between the first guide sleeve and the piston rod;
the second guide sleeve is sleeved on the piston rod and at least partially positioned in the second circumferential gap, and the second guide sleeve is in sealing fit with the piston rod and can float along with the piston rod in the radial direction relative to the first guide sleeve;
and the cap covers the opening end of the cylinder body and enables the cylinder body, the first guide sleeve and the second guide sleeve to be fixed to each other along the axial direction.
Preferably, the first guide sleeve has a first supporting portion disposed in the first circumferential gap and a first engaging portion extending from the first supporting portion and protruding from the first circumferential gap; the second guide sleeve is provided with a second supporting part arranged in the second circumferential gap and a second matching part which is extended from the second supporting part and protrudes out of the second circumferential gap; the cap covers the cylinder body, the first fitting portion and the second support portion so that the cylinder body, the first guide sleeve and the second guide sleeve are fixed to each other in the axial direction.
Preferably, a first axial gap is formed between the cap and the tail end of the cylinder body, and the pressing section of the first matching part is arranged in the first axial gap; the cap and the first matching portion are provided with a second axial gap, the pressing section of the second supporting portion is arranged in the second axial gap, and the cap axially presses the pressing sections of the first matching portion and the second supporting portion, so that the cylinder body, the first guide sleeve and the second guide sleeve are axially fixed with each other.
Preferably, a composite bushing is disposed on a side of the first guide sleeve facing the piston rod and is attached to the piston rod through the composite bushing.
Preferably, the second guide sleeve is provided with at least one sealing ring on one side facing the piston rod.
Preferably, the seal ring comprises a sliding body which is in contact with the piston rod and can slide relatively, and an elastic body is connected with the sliding body for reducing the friction loss of the sliding body.
Preferably, one side of the second guide sleeve, which faces the piston rod, is provided with a dust ring, and the dust ring is mounted at one end of the second guide sleeve, which is far away from the piston.
Preferably, a static sealing ring is arranged on one side of the second guide sleeve facing the first guide sleeve, and the static sealing ring is provided with at least two sealing lips arranged facing the first guide sleeve.
Preferably, a radial floating gap h is respectively arranged between the second guide sleeve and the first guide sleeve and between the second guide sleeve and the cap.
Preferably, the radial floating gap h is not less than 0.5 mm.
Preferably, a side of the second guide sleeve facing the piston rod is provided with a guide ring.
The invention provides in a second aspect a hydraulic drive system comprising a hydraulic cylinder as described above.
The invention provides in a third aspect a working machine comprising a hydraulic drive system as described above.
Through the technical scheme, the guide sleeve structure is arranged to be a split type structure, the guide sleeve structure is composed of the first guide sleeve and the second guide sleeve, the second guide sleeve is in sealing fit with the piston rod and can float along with the piston rod in the radial direction relative to the first guide sleeve, the split type guide sleeve structure improves the follow-up performance of the guide sleeve and the piston rod seal, improves the sealing performance of the piston rod seal, improves the side load resistance and the low-speed dynamic performance of the hydraulic cylinder, and avoids the shaking crawling or abnormal sound phenomenon accompanying the low-speed extending and retracting action of the piston rod.
Drawings
FIG. 1 is a schematic diagram of a prior art hydraulic cylinder;
FIG. 2 is a schematic representation of the construction of the hydraulic cylinder of the present invention;
FIG. 3 is a partial schematic view of the hydraulic cylinder of FIG. 2 in the direction of A;
FIG. 4 is an enlarged view of the hydraulic cylinder of FIG. 2 at D;
fig. 5 is an enlarged view of the hydraulic cylinder of fig. 2 at D.
Description of the reference numerals
1 cylinder and 2 piston
3 spacer 4 piston rod
5 composite bushing 6 guide ring
7 Tesi seal 8U-shaped ring
9 dustproof ring 10 first guide sleeve
11 static sealing ring 12 second guide sleeve
13 radial floating gap of cap h
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, the terms "first", "second", … …, etc. are used only for distinguishing different technical features, and are not used for limiting the importance of the technical features, and the effects achieved by the technical features are basically the same if necessary. In the present invention, the use of directional terms such as "upper, lower, left, right" generally means upper, lower, left, right as viewed with reference to the accompanying drawings, unless otherwise specified; "inner and outer" refer to the inner and outer relative to the profile of the components themselves.
Referring to fig. 2 to 5, the present invention provides a hydraulic cylinder including a cylinder body 1, a piston 2, a piston rod 4, a first guide sleeve 10, a second guide sleeve 12, and a cap 13. Wherein, the piston 2 can be arranged inside the cylinder 1 in a sliding way; the piston rod 4 is fixedly connected to the piston 2, and a first circumferential gap is formed between the piston rod and the inner wall of the cylinder body 1; the first guide sleeve 10 is at least partially arranged in the first circumferential gap, and a second circumferential gap is formed between the first guide sleeve and the piston rod 4; the second guide sleeve 12 is sleeved on the piston rod 4 and at least partially positioned in the second circumferential gap, and the second guide sleeve 12 is in sealing fit with the piston rod 4 and can radially float along with the piston rod 4 relative to the first guide sleeve 10; a cap 13 covers the open end of the cylinder 1 and fixes the cylinder 1, the first guide sleeve 10, and the second guide sleeve 12 to each other in the axial direction.
It will be understood that the cap 13 fixes the cylinder 1, the first guide sleeve 10 and the second guide sleeve 12 to each other in the axial direction, i.e. means that the cylinder 1, the first guide sleeve 10 and the second guide sleeve 12 are not substantially displaced relative to each other in the axial direction, and the pressure applied by the cap 13 to the cylinder 1, the first guide sleeve 10 and the second guide sleeve 12 should be ensured such that the second guide sleeve 12 can float radially with the piston rod 4 relative to the first guide sleeve 10.
Through the technical scheme, the guide sleeve structure is arranged to be a split structure, the guide sleeve structure is composed of the first guide sleeve 10 and the second guide sleeve 12, the second guide sleeve 12 is in sealing fit with the piston rod 4 and can float along with the piston rod 4 relative to the first guide sleeve 10 in the radial direction, the split guide sleeve structure improves the follow-up performance of the guide sleeve structure and the piston rod 4 in sealing, the sealing performance of the piston rod 4 in sealing is improved, and the side load resistance and the low-speed dynamic performance of a hydraulic cylinder (hydraulic oil cylinder) are improved.
The first guide sleeve 10 further may have a first supporting portion and a first matching portion extending from the first supporting portion, the first supporting portion is located in the first circumferential gap, and the first matching portion is arranged to protrude from the first circumferential gap; the second guide sleeve 12 further has a second supporting portion and a second matching portion extending from the second supporting portion, the second supporting portion is located in the second circumferential gap, and the second matching portion is arranged to protrude from the second circumferential gap; the cap 13 covers the outer wall of the cylinder 1, the first fitting portion, the second supporting portion, and the second fitting portion. Wherein, the cap 13 covers the outer wall of the cylinder body, the first fitting portion and the second supporting portion to enable the cylinder body 1, the first guide sleeve 10 and the second guide sleeve 12 to be fixed to each other in the axial direction. And the cap 13 is further covered on the second matching part for completely closing the opening end of the cylinder body 1, on the basis, an O-ring can be further arranged at the second matching part covered on the cap 13 to ensure the sealing performance of the opening end of the cylinder body 1.
The first fitting portion may further have a pressing section with a first axial gap between the cap 13 and the end of the cylinder 1, in which the pressing section of the first fitting portion is accommodated; the second support part also has a pressing section, a second axial gap is formed between the cap 13 and the first matching part, and the pressing section of the second support part is accommodated in the second axial gap; the cap 13 applies pressure to the pressing sections of the first fitting portion and the second supporting portion in the axial direction, thereby axially fixing the cylinder block 1, the first guide sleeve 10, and the second guide sleeve 12 to each other. So set up, make this pneumatic cylinder be convenient for production and equipment.
In order to improve the follow-up performance of the guide sleeve structure and the seal of the piston rod 4 and improve the seal performance of the seal of the piston rod 4, a plurality of sealing elements are respectively arranged on the first guide sleeve 10 and the second guide sleeve 12, and the sealing elements are matched with the split type guide sleeve structure of the invention so as to finally improve the side load resistance and the low-speed dynamic performance of the hydraulic cylinder. The plurality of sealing members and the guide members on the first and second guide sleeves 10 and 12 will be described in detail with reference to fig. 2, 4 and 5.
Referring to fig. 2, 4 and 5, the first guide sleeve 10 is provided with the composite bushing 5 towards one side of the piston rod 4, the composite bushing 5 plays a role in guiding and supporting, the self-lubricating effect is good, the friction force can be effectively reduced, and the first guide sleeve 10 is attached to the piston rod through the composite bushing 5 so as to improve the sealing performance of the piston rod 4. Meanwhile, one side of the first guide sleeve 10 facing the cylinder body is provided with a plurality of O-shaped rings, so that the sealing performance of the cylinder body 1 can be improved, and the first guide sleeve 10 and the cylinder body 1 are prevented from being broken due to mutual impact and friction.
The second guide sleeve 12 is provided with a guide ring 6, a steckel seal 7, a U-shaped ring 8, a guide ring 6 and a dust ring 9 in sequence from left to right on one side facing the piston rod 4. Wherein, the guide ring 6 plays a role of guiding and supporting; the Stent seal 7 consists of a sliding body and an elastic body, the sliding body is in contact with the piston rod 4 and can move relatively, the sliding body has a special section and small contact area with the piston rod, pressure impact can be effectively absorbed, friction force is reduced, and the elastic body is used for compensating friction loss of the sliding body; the U-shaped ring 8 can also be composed of a sliding body and an elastic body, the sliding body is composed of polytetrafluoroethylene and copper powder, the hardness is high, the sliding body is in contact with the piston rod 4 and moves relatively, the friction coefficient of the sliding body is small, meanwhile, the contact area of the elastic body and the piston rod 4 can be reduced, the friction force is effectively reduced, the elastic body is prevented from being extruded out, the elastic body is made of a nitrile rubber material, the main sealing effect is achieved, and meanwhile, the friction loss of the sliding body is compensated; the dustproof ring 9 plays a role in dust prevention and water prevention. According to the invention, the guide ring 6, various sealing rings (the steiner 7, the U-shaped ring 8) and the like are arranged on the second guide sleeve 12, the second guide sleeve 12 is used for guiding and sealing the piston rod 4, the radial floating of the second guide sleeve 12 can be used for keeping good (coaxial) matching with the piston rod 4 when the piston rod runs at a low speed, and the phenomena of shaking, crawling or abnormal sound can be effectively prevented.
The side of the second guide sleeve 12 facing the first guide sleeve 10 is provided with a static seal ring 11, the static seal ring 11 is provided with a body part and a lip part, the lip part comprises two seal lips, the two seal lips are arranged facing the first guide sleeve 10, the static seal ring 11 plays a sealing role through interference compression of the two seal lips, pressure acts on the body part of the static seal ring 11, contact stress of the seal lips with the first guide sleeve 10 and the bottom diameter of the groove is increased, and the contact stress is correspondingly increased along with the increase of the pressure, compared with other static seals, the static seal ring 11 has good extrusion resistance and is convenient to assemble.
It should be noted that the steve seal 7, the U-shaped ring 8 and the static seal ring 11 are preferably one-way seals, that is, when hydraulic oil enters through the right oil port of the hydraulic cylinder, the steve seal 7, the U-shaped ring 8 and the static seal ring 11 play a role in sealing. The composite bushing 5 and a plurality of O-shaped rings are arranged on a first guide sleeve 10, a guide ring 6, a Stent seal 7, a U-shaped ring 8, a dust ring 9 and a static seal ring 11 are arranged on a second guide sleeve 12, a sealing element and a piston guide ring are arranged on the peripheral side of a piston 2, and a cylinder body 1, a piston rod 4, the piston 2, the first guide sleeve 10 and the second guide sleeve 12 form two closed cavities (a rodless cavity and a rod cavity) so as to realize the extending and retracting actions of the hydraulic cylinder.
Specifically, in fig. 2, when hydraulic oil enters through the left end oil port of the hydraulic cylinder, the rodless cavity is filled with hydraulic oil, and the hydraulic cylinder does an extending action to generate pressure under the action of an external load; the piston guide rings at the leftmost end and the rightmost end of the piston 2 do not play a role in sealing, and play a role in guiding and supporting; the one-way sealing element in the middle of the piston 2 can effectively absorb pressure impact and effectively reduce friction force; the bidirectional sealing element in the middle of the piston is composed of a sliding body and an elastic body, the sliding body is provided with a special V-shaped groove, hydraulic oil can be stored in the V-shaped groove, the contact area of the hydraulic oil and the cylinder body 1 is small so as to effectively reduce friction force, and the elastic body is used for compensating friction loss of the sliding body. When hydraulic oil enters through an oil port at the right end of the oil cylinder, the rod cavity is filled with the hydraulic oil, the hydraulic cylinder retracts, pressure is generated under the action of external load, and the composite bushing 5, the guide ring 6, the Steer seal 7, the U-shaped ring 8, the dustproof ring 9 and the static sealing ring 11 respectively play respective roles.
In addition, as shown in fig. 5, a radial floating gap h is provided between the second guide sleeve 12 and the first guide sleeve 10 and the cap 13, respectively, and the radial floating gap h is preferably not less than 0.5 mm. When the piston rod 4 is extended/retracted, a certain deflection is generated under the action of the dead weight, and under the influence of the fit clearance, the offset load and the accumulated machining error of each part, a certain included angle is formed between the axis of the piston rod 4 and the axis of the inner hole of the cylinder body 1, so that the piston rod 4 can generate certain bending and deflection. And a radial floating gap h of 0.5mm is respectively arranged between the second guide sleeve 12 and the first guide sleeve 10 and the cap 13, and the static seal ring 11 is arranged on the second guide sleeve 12, so that the second guide sleeve 12 can float up and down in a certain range along with the piston rod 4, the follow-up performance of the guide ring 6, the Stent seal 7, the U-shaped ring 8 and the dust ring 9 is improved, the uniformity of the contact stress between the guide piece and the seal piece and the surface of the piston rod 4 is ensured, the sealing performance and the low-speed dynamic performance are improved, and the phenomenon of low-speed shaking crawling or abnormal sound generated when the hydraulic cylinder works is avoided.
In addition, in an embodiment of the present invention, a spacer 3 may be further sleeved outside the piston rod 4, a gap is formed between the spacer 3 and the inner wall of the cylinder 1, when the piston rod 4 performs an extending motion, the spacer 3 performs a limiting function, that is, when the spacer 3 is connected to the first guide sleeve 10, the piston rod 4 cannot extend further, and the spacer 3 may be used to control the stroke of the hydraulic cylinder.
The invention provides in another aspect a hydraulic drive system comprising a hydraulic cylinder as described above. The invention also provides engineering machinery which comprises the hydraulic driving system.
In conclusion, the hydraulic cylinder has good low-speed running stability, does not shake and creep or abnormal sound when being extended and retracted, has low starting pressure and strong anti-pollution capability. The hydraulic cylinder can be applied to various fields such as but not limited to engineering machinery, environmental sanitation machinery, high-altitude operation vehicles and the like.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the specific features in any suitable way, and the invention will not be further described in relation to the various possible combinations in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (11)
1. A hydraulic cylinder, comprising:
a cylinder body (1);
a piston (2), the piston (2) being slidably disposed inside the cylinder (1);
the piston rod (4) is fixedly connected to the piston (2), and a first circumferential gap is formed between the piston rod (4) and the inner wall of the cylinder body (1);
the first guide sleeve (10) is provided with a first supporting part arranged in the first circumferential gap and a first matching part which is extended from the first supporting part and protrudes out of the first circumferential gap, and a second circumferential gap is formed between the first guide sleeve (10) and the piston rod (4);
the second guide sleeve (12) is sleeved on the piston rod (4) and is provided with a second supporting part arranged in the second circumferential gap and a second matching part which extends from the second supporting part and protrudes out of the second circumferential gap, and the second guide sleeve (12) is in sealing fit with the piston rod (4);
a cap (13), wherein the cap (13) is connected to the outer wall of the opening end of the cylinder body (1) and abuts against the first matching part and the second supporting part, so that the cylinder body (1), the first guide sleeve (10) and the second guide sleeve (12) are fixed with each other along the axial direction, and radial floating gaps h are respectively arranged between the second guide sleeve (12) and the first guide sleeve (10) and between the second guide sleeve (12) and the cap (13) so as to be capable of floating along with the radial direction of the piston rod (4) relative to the first guide sleeve (10).
2. Hydraulic cylinder according to claim 1, characterized in that the cap (13) has a first axial gap with the end of the cylinder body (1) in which the pressing section of the first fitting is arranged; a second axial gap is formed between the cap (13) and the first matching portion, a pressing section of the second supporting portion is arranged in the second axial gap, and the cap (13) presses the pressing sections of the first matching portion and the second supporting portion in the axial direction, so that the cylinder body (1), the first guide sleeve (10) and the second guide sleeve (12) are fixed to each other in the axial direction.
3. Hydraulic cylinder according to claim 1, characterized in that the side of the first guide sleeve (10) facing the piston rod (4) is provided with a composite bushing (5) and is attached to the piston rod (4) by means of this composite bushing (5).
4. Hydraulic cylinder according to claim 1, characterized in that the side of the second guide sleeve (12) facing the piston rod (4) is provided with at least one sealing ring.
5. Hydraulic cylinder according to claim 4, wherein the sealing ring comprises a sliding body in contact with the piston rod (4) and capable of sliding relative thereto, said sliding body being connected with an elastomer for reducing friction losses of the sliding body.
6. Hydraulic cylinder according to claim 4, characterized in that the side of the second guide sleeve (12) facing the piston rod (4) is provided with a dust ring (9), which dust ring (9) is mounted at the end of the second guide sleeve (12) remote from the piston (2).
7. Hydraulic cylinder according to claim 1, characterized in that the side of the second guide sleeve (12) facing the first guide sleeve (10) is provided with a static sealing ring (11), which static sealing ring (11) has at least two sealing lips arranged facing the first guide sleeve (10).
8. The hydraulic cylinder of claim 1, wherein the radial float gap h is not less than 0.5 mm.
9. Hydraulic cylinder according to any of claims 1-8, characterized in that the side of the second guide sleeve (12) facing the piston rod (4) is provided with a guide ring (6).
10. A hydraulic drive system, characterized in that it comprises a hydraulic cylinder according to any one of claims 1 to 9.
11. A working machine, characterized in that it comprises a hydraulic drive system according to claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810701234.7A CN108999830B (en) | 2018-06-29 | 2018-06-29 | Hydraulic cylinder, hydraulic driving system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810701234.7A CN108999830B (en) | 2018-06-29 | 2018-06-29 | Hydraulic cylinder, hydraulic driving system and engineering machinery |
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| Publication Number | Publication Date |
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| CN108999830A CN108999830A (en) | 2018-12-14 |
| CN108999830B true CN108999830B (en) | 2020-12-15 |
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| CN201810701234.7A Active CN108999830B (en) | 2018-06-29 | 2018-06-29 | Hydraulic cylinder, hydraulic driving system and engineering machinery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110273889B (en) * | 2019-07-08 | 2020-12-29 | 江苏恒立液压股份有限公司 | Lifting oil cylinder of empty box vehicle |
| CN113404737A (en) * | 2021-05-24 | 2021-09-17 | 中联重科股份有限公司 | Hydraulic cylinder and hoisting device |
| CN118026026B (en) * | 2024-04-12 | 2024-06-21 | 山西泰宝科技有限公司 | Hydraulic support aqueous medium pushing jack sealing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201606342U (en) * | 2010-01-29 | 2010-10-13 | 湖南特力液压有限公司 | High-speed zero-escape hydraulic cylinder |
| DE102011119181A1 (en) * | 2011-11-23 | 2013-05-23 | Robert Bosch Gmbh | Cylinders, in particular hydraulic cylinders for the deep sea |
| CN202500849U (en) * | 2012-03-31 | 2012-10-24 | 徐州徐工液压件有限公司 | Vertical large-span guide structure of oil cylinder |
| CN202646219U (en) * | 2012-05-18 | 2013-01-02 | 抚顺天宝重工液压制造有限公司 | Long-stroke hydraulic cylinder |
| CN102943786B (en) * | 2012-12-11 | 2015-08-12 | 湖南特力液压有限公司 | Oil hydraulic cylinder |
| CN203463402U (en) * | 2013-08-14 | 2014-03-05 | 贵州新安航空机械有限责任公司 | Shearing-force-resistance hydraulic cylinder |
| CN203822744U (en) * | 2014-03-28 | 2014-09-10 | 四川长江液压件有限责任公司 | Super-huge type ultrahigh-pressure hydraulic cylinder |
| CN207093504U (en) * | 2017-07-10 | 2018-03-13 | 无锡市长江液压缸厂 | A kind of high abrasion guide frame for hydraulic cylinder |
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