CN108757626B - Low-pressure starting buffering type hydraulic oil cylinder - Google Patents
Low-pressure starting buffering type hydraulic oil cylinder Download PDFInfo
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- CN108757626B CN108757626B CN201810540701.2A CN201810540701A CN108757626B CN 108757626 B CN108757626 B CN 108757626B CN 201810540701 A CN201810540701 A CN 201810540701A CN 108757626 B CN108757626 B CN 108757626B
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- piston rod
- guide rod
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- inner end
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
- F15B15/224—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston which closes off fluid outlets in the cylinder bore by its own movement
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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 low-pressure starting buffering type hydraulic oil cylinder, and belongs to the technical field of hydraulic cylinders. The device comprises a cylinder barrel, a base, an end cover, a piston rod and a piston; a buffer cavity is formed in the center of the base, and a buffer bulge is arranged at the inner end of the piston rod; a flow guide rod is fixed on the inner end surface of the piston rod; the base is provided with a flow guide hole which is opposite to and matched with the flow guide rod; when the piston rod retracts to the bottom, the guide rod penetrates through the guide hole, the inner end of the guide rod extends out of the guide hole to enter the oil inlet hole, and the oil port at the inner end of the guide rod is communicated with the oil inlet hole. The invention has simple structure, convenient processing and low production cost; and the one-way valve is used, so that the structure of the guide rod has stronger impact resistance, long service life and low maintenance cost.
Description
Technical Field
The invention relates to the technical field of hydraulic cylinders, in particular to a low-pressure starting buffering type hydraulic cylinder.
Background
The existing hydraulic oil cylinder comprises a cylinder barrel, a piston rod with a piston and a cylinder head fixedly connected with the cylinder barrel, wherein a guide sleeve arranged in the cylinder barrel is arranged, and a rod cavity oil port and a rodless cavity oil port are arranged in the cylinder barrel. In order to reduce the impact on the cylinder bottom when the piston rod falls back, a buffer cavity is arranged between the end part of the piston rod and the cylinder bottom. However, when the buffer structure is in low pressure, the stress surface of the end part of the piston rod is small, the starting speed is slow, and the working efficiency is influenced.
In order to solve the problem of quick start, the prior patent discloses an easy-start hydraulic oil cylinder (CN 204284066U). The hydraulic oil cylinder easy to start comprises a cylinder barrel, a guide sleeve arranged in the cylinder barrel through a wire ring, a piston rod with a piston and a cylinder head fixedly connected with the cylinder barrel in a welding mode, wherein the piston rod penetrates through the guide sleeve in a sliding mode; the piston rod is provided with a step, the front end of the piston is tightly attached to the step, and the rear end of the piston is provided with a compression nut; a piston rod in the piston is provided with a ring groove, and a sealing ring is arranged in the ring groove; when the piston rod extends out, oil is supplied to the oil port of the rodless cavity, hydraulic oil pushes the check valve open to enter the cylinder barrel, the starting pressure of the hydraulic oil cylinder can be increased, the hydraulic oil cylinder is easy to start at low pressure, and the starting speed and the working efficiency can be improved; when the oil inlet of the oil port of the rod cavity and the recovery of the piston rod are carried out, the one-way valve is closed, hydraulic oil can only flow out of the oil port of the rodless cavity, the buffering effect is started, the piston is prevented from being impacted, abnormal sound is eliminated, and the service life of parts is prolonged.
Among them are the problems: the hydraulic oil cylinder is complex to machine due to the arrangement of the one-way valve, and the machining and production cost is increased; moreover, under such high-impact and long-time working conditions, the service life of the check valve is difficult to guarantee, which causes frequent maintenance of the hydraulic oil cylinder and high maintenance cost.
Disclosure of Invention
In order to solve the technical problems, the invention provides the low-pressure starting buffer type hydraulic oil cylinder which is simple in structure and convenient to maintain.
The invention is realized by the following technical scheme: a low-pressure starting buffer type hydraulic oil cylinder comprises a cylinder barrel, wherein a base and an end cover are respectively fixed at two ends of the cylinder barrel; a piston rod is arranged in the cylinder barrel, a central hole is formed in the end cover, and the piston rod penetrates through the end cover in a sliding mode; the inner end of the piston rod is connected with a piston; the piston is slidably mounted in the cylinder barrel; a buffer cavity is formed in the center of the base, and a buffer bulge matched with the buffer cavity is arranged at the inner end of the piston rod; an oil inlet hole communicated with the bottom of the buffer cavity is formed in the base, and an oil return hole is formed in the front end of the cylinder barrel; a plurality of guide rods uniformly distributed around the axis of the piston rod are fixed at the edge of the inner end face of the piston rod; the base is provided with a flow guide hole which is opposite to and matched with the flow guide rod, and the flow guide hole is communicated with the oil inlet hole; the guide rod is in clearance fit with the guide hole; the center of the guide rod is provided with an oil passage, the side walls of the two ends of the guide rod are provided with oil ports, and the inner end of the guide rod is sealed; when the piston rod retracts to the bottom, the guide rod penetrates through the guide hole, the inner end of the guide rod extends out of the guide hole to enter the oil inlet hole, and the oil port at the inner end of the guide rod is communicated with the oil inlet hole.
Preferably: the inner end of the circumferential surface of the piston rod is provided with uniformly distributed sinking grooves, and fixed blocks are embedded into the sinking grooves; the fixed block is fixedly connected with the piston rod through a screw; the guide rod is installed on the fixed block.
Preferably: the fixed block is provided with a mounting through hole, and the inner end of the mounting through hole is provided with a step rabbet; and the end part of the guide rod is provided with a stop platform matched with the step spigot.
Preferably: the total number of the guide rods is four.
When the piston rod falls back:
when the buffering bulge just enters the buffering cavity, the end part of the guide rod enters the guide hole, and the end part of the guide rod is sealed, so that the guide hole is in a stop state at the moment, and the buffering bulge and the buffering cavity are matched with each other to complete buffering; when the buffering bulge completely enters the buffering cavity, the inner end of the guide rod extends out of the guide hole to enter the oil inlet hole, and the oil port at the inner end of the guide rod is communicated with the oil inlet hole;
at the final stage of buffering, the flow guide holes are in a communicated state, although the buffering effect of the buffering bulges and the buffering cavity can be influenced, the speed of the piston rod is reduced to be low, and therefore the buffering effect is not greatly influenced;
when the piston rod stretches out:
the first oil path is: high-pressure oil in the oil inlet hole enters the buffer cavity and jacks up the buffer bulge;
the second oil path is: high-pressure oil in the oil inlet hole enters the end face of the piston through the oil port and the oil duct in the guide rod, so that the handling surface of the piston rod is enlarged, and the starting pressure is improved;
after starting, the guide rod gradually enters the guide hole, and the second oil way is gradually closed; at this time, however, the piston rod is started, the gap between the buffer bulge and the buffer cavity is large, and high-pressure oil can smoothly enter the end face of the piston from the space between the buffer bulge and the buffer cavity.
Compared with the prior art, the invention has the beneficial effects that: the structure is simple, the processing is convenient, and the production cost is low; and the one-way valve is used, so that the structure of the guide rod has stronger impact resistance, long service life and low maintenance cost.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
fig. 3 is a view from a-a in fig. 1.
In the figure: 1. a cylinder barrel; 2. a base; 2-1, a buffer cavity; 3. an end cap; 4. a piston rod; 4-1, buffer bulges; 5. a piston; 6. an oil return hole; 7. an oil inlet hole; 8. a guide rod; 8-1, an oil duct; 8-2, oil ports; 9. a flow guide hole; 10. and (5) fixing blocks.
Detailed Description
The technical solutions in the embodiments 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 obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, a low-pressure start buffer type hydraulic oil cylinder comprises a cylinder barrel 1, wherein a base 2 and an end cover 3 are respectively fixed at two ends of the cylinder barrel 1; a piston rod 4 is arranged in the cylinder barrel 1, a central hole is formed in the end cover 3, and the piston rod 4 penetrates through the end cover 3 in a sliding mode; the inner end of the piston rod 4 is connected with a piston 5; the piston 5 is slidably mounted in the cylinder 1. A buffer cavity 2-1 is arranged at the center of the base 2, and a buffer bulge 4-1 matched with the buffer cavity 2-1 is arranged at the inner end of the piston rod 4; the base 2 is provided with an oil inlet 7 communicated with the bottom of the buffer cavity 2-1, and the front end of the cylinder barrel 1 is provided with an oil return hole 6.
4 evenly distributed sunk grooves are formed in the inner end position of the circumferential surface of the piston rod 4, fixing blocks 10 are embedded into the sunk grooves, and the fixing blocks 10 are fixedly connected with the piston rod 4 through screws. The fixed block 10 is provided with an installation through hole, the inner end of the installation through hole is provided with a step rabbet, the guide rod 8 penetrates through the installation through hole on the fixed block 10, and the end part of the guide rod 8 is provided with a stop table matched with the step rabbet.
A flow guide hole 9 opposite to and matched with the flow guide rod 8 is formed in the base 2, and the flow guide hole 9 is communicated with the oil inlet 7; the guide rod 8 is in clearance fit with the guide hole 9; the center of the guide rod 8 is provided with an oil duct 8-1, the side walls of the two ends of the guide rod 8 are provided with oil ports 8-2, and the inner end of the guide rod 8 is sealed.
When the piston rod 4 retracts to the bottom, the guide rod 8 penetrates through the guide hole 9, the inner end of the guide rod 8 extends out of the guide hole 9 to enter the oil inlet hole 7, and the oil port 8-2 at the inner end of the guide rod 8 is communicated with the oil inlet hole 7.
The working process is as follows:
1, when the piston rod falls back:
when the buffering bulge just enters the buffering cavity, the end part of the guide rod enters the guide hole, and the end part of the guide rod is sealed, so that the guide hole is in a stop state at the moment, and the buffering bulge and the buffering cavity are matched with each other to complete buffering; when the buffering bulge completely enters the buffering cavity, the inner end of the guide rod extends out of the guide hole to enter the oil inlet hole, and the oil port at the inner end of the guide rod is communicated with the oil inlet hole;
at the final stage of buffering, the flow guide holes are in a communicated state, although the buffering effect of the buffering bulges and the buffering cavity can be influenced, the speed of the piston rod is reduced to be low, and therefore the buffering effect is not greatly influenced;
2, when the piston rod extends out:
the first oil path is: high-pressure oil in the oil inlet hole enters the buffer cavity and jacks up the buffer bulge;
the second oil path is: high-pressure oil in the oil inlet hole enters the end face of the piston through the oil port and the oil duct in the guide rod, so that the handling surface of the piston rod is enlarged, and the starting pressure is improved;
after starting, the guide rod gradually enters the guide hole, and the second oil way is gradually closed; at this time, however, the piston rod is started, the gap between the buffer bulge and the buffer cavity is large, and high-pressure oil can smoothly enter the end face of the piston from the space between the buffer bulge and the buffer cavity.
As can be seen from the embodiment, the invention has the advantages of simple structure, convenient processing and low production cost; and the one-way valve is used, the structure of the guide rod has stronger impact resistance, long service life and low maintenance cost.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A low-pressure starting buffer type hydraulic oil cylinder comprises a cylinder barrel (1), wherein a base (2) and an end cover (3) are respectively fixed at two ends of the cylinder barrel (1); a piston rod (4) is installed in the cylinder barrel (1), a central hole is formed in the end cover (3), and the piston rod (4) penetrates through the end cover (3) in a sliding mode; the inner end of the piston rod (4) is connected with a piston (5); the piston (5) is arranged in the cylinder barrel (1) in a sliding manner;
a buffer cavity (2-1) is formed in the center of the base (2), and a buffer bulge (4-1) matched with the buffer cavity (2-1) is arranged at the inner end of the piston rod (4); an oil inlet hole (7) communicated with the bottom of the buffer cavity (2-1) is formed in the base (2), and an oil return hole (6) is formed in the front end of the cylinder barrel (1);
the method is characterized in that:
a plurality of guide rods (8) uniformly distributed around the axis of the piston rod (4) are fixed at the edge position of the inner end surface of the piston rod (4); a flow guide hole (9) opposite to and matched with the flow guide rod (8) is formed in the base (2), and the flow guide hole (9) is communicated with the oil inlet hole (7); the guide rod (8) is in clearance fit with the guide hole (9); an oil duct (8-1) is formed in the center of the guide rod (8), oil ports (8-2) are formed in the side walls of the two ends of the guide rod (8), and the inner end of the guide rod (8) is sealed;
when the piston rod (4) retracts to the bottom, the guide rod (8) penetrates through the guide hole (9), the inner end of the guide rod (8) extends out of the guide hole (9) to enter the oil inlet hole (7), and the oil port (8-2) at the inner end of the guide rod (8) is communicated with the oil inlet hole (7).
2. The low pressure start-up cushioned hydraulic ram of claim 1, wherein: the inner end of the circumferential surface of the piston rod (4) is provided with uniformly distributed sinking grooves, and fixed blocks (10) are embedded into the sinking grooves; the fixed block (10) is fixedly connected with the piston rod (4) through a screw; the guide rod (8) is installed on the fixing block (10).
3. The low pressure start cushioned hydraulic ram of claim 2, wherein: the fixed block (10) is provided with a mounting through hole, and the inner end of the mounting through hole is provided with a step rabbet; and a stopping platform matched with the step spigot is arranged at the end part of the guide rod (8).
4. A low pressure actuated cushioned hydraulic ram as claimed in any one of claims 1 to 3, wherein: the number of the guide rods (8) is four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810540701.2A CN108757626B (en) | 2018-05-30 | 2018-05-30 | Low-pressure starting buffering type hydraulic oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810540701.2A CN108757626B (en) | 2018-05-30 | 2018-05-30 | Low-pressure starting buffering type hydraulic oil cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108757626A CN108757626A (en) | 2018-11-06 |
| CN108757626B true CN108757626B (en) | 2020-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810540701.2A Active CN108757626B (en) | 2018-05-30 | 2018-05-30 | Low-pressure starting buffering type hydraulic oil cylinder |
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| Country | Link |
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| CN (1) | CN108757626B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203161708U (en) * | 2013-01-21 | 2013-08-28 | 三一汽车制造有限公司 | Buffering hydraulic oil cylinder |
| CN204727243U (en) * | 2015-04-23 | 2015-10-28 | 陕西安恬科工贸有限公司 | Fruit automatic emptying machine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201714734U (en) * | 2010-06-25 | 2011-01-19 | 格力乐液压***(常州)有限公司 | Buffer type hydraulic oil cylinder used for wind energy equipment |
| CN201874925U (en) * | 2010-10-27 | 2011-06-22 | 东风汽车公司 | Adjustable buffer structure of hydraulic cylinder |
| JP5767991B2 (en) * | 2012-03-23 | 2015-08-26 | カヤバ工業株式会社 | Fluid pressure cylinder |
| CN205578403U (en) * | 2016-04-19 | 2016-09-14 | 湖南协力液压有限公司 | Butter type hydraulic oil cylinder |
-
2018
- 2018-05-30 CN CN201810540701.2A patent/CN108757626B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203161708U (en) * | 2013-01-21 | 2013-08-28 | 三一汽车制造有限公司 | Buffering hydraulic oil cylinder |
| CN204727243U (en) * | 2015-04-23 | 2015-10-28 | 陕西安恬科工贸有限公司 | Fruit automatic emptying machine |
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| Publication number | Publication date |
|---|---|
| CN108757626A (en) | 2018-11-06 |
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