CN214578023U - Adjustable buffer oil cylinder - Google Patents
Adjustable buffer oil cylinder Download PDFInfo
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- CN214578023U CN214578023U CN202120323303.2U CN202120323303U CN214578023U CN 214578023 U CN214578023 U CN 214578023U CN 202120323303 U CN202120323303 U CN 202120323303U CN 214578023 U CN214578023 U CN 214578023U
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 61
- 238000000034 method Methods 0.000 description 11
- 239000010720 hydraulic oil Substances 0.000 description 6
- 238000007667 floating Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000009193 crawling Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Abstract
The utility model discloses an adjustable buffer cylinder. The hydraulic cylinder comprises a cylinder bottom, a cylinder barrel and a cylinder head, wherein the rear end of a piston rod is sleeved with a piston and a buffer sleeve, a cylinder head hole close to a rod cavity is formed in the cylinder head, and the rod cavity is communicated with an oil port of the rod cavity through the buffer hole; when the piston rod moves, the front end of the piston rod can extend out of the cylinder head hole, and when the buffer sleeve moves into the buffer hole, the outer wall of the buffer sleeve is in clearance fit with the inner wall of the buffer hole; when the buffer sleeve starts to enter the buffer hole, oil can only flow into the oil port of the rod cavity from the gap between the buffer sleeve and the buffer hole, so that the buffer effect is ensured; an axial through hole communicated with the rod cavity is formed in the buffer sleeve, a spring and a steel ball are arranged in the axial through hole to form a one-way valve structure, and when the piston rod retracts, the oil pushes the one-way valve to enter the rod cavity, so that the oil cylinder is quickly opened; the cylinder head is provided with an axial throttling hole and an adjusting hole close to the rod cavity, the adjusting hole is internally provided with an adjusting rod, and the throttling hole can be plugged or opened by rotating the adjusting rod to adjust the buffering effect of the oil cylinder.
Description
Technical Field
The utility model belongs to the technical field of the hydraulic cylinder technique and specifically relates to a hydraulic cylinder with buffer function.
Background
The oil cylinder is an actuating element of a hydraulic system and comprises a cylinder barrel, a piston and a piston rod, wherein the piston moves at a high speed in the oil cylinder under the driving of hydraulic pressure. The front end of the cylinder barrel is provided with an end cover, when a piston rod reaches the front end of the oil cylinder in the process of rapid movement of the hydraulic oil cylinder, strong impact, noise and even mechanical collision can be generated at a stroke terminal, and particularly under the condition of high pressure, the influence is more obvious, and the service life of the oil cylinder is seriously influenced.
In order to reduce the impact of the piston on a cylinder cover (also called a cylinder head), especially when the working pressure of the oil cylinder is greater than 25MPa and the mass of moving parts is large, in order to prevent the piston from mechanically colliding with the cylinder cover at the end of a stroke to cause noise and impact, even damage to parts of the oil cylinder, a buffer structure needs to be arranged on the cylinder cover of the oil cylinder, and proper braking and buffering are performed before the movement is finished to relieve the impact of the piston on the cylinder cover and ensure the service life of the system and the oil cylinder.
There are basically two methods of buffering at present: one is external control of the hydraulic cylinder, a throttle valve or other flow control devices are arranged on a loop for controlling the hydraulic cylinder for buffering, and the general structure is more complicated; the other is internal control of the hydraulic cylinder, a buffer device is designed in the hydraulic cylinder to realize buffer, for example, the Chinese patent application 'hydraulic cylinder with improved buffer effect' (application publication No. CN101936318A, application publication date: 2011 1 month and 5 days), the structure of the hydraulic cylinder is characterized in that a cylindrical buffer sleeve is sleeved on a piston rod, the length of the cylindrical buffer sleeve is less than that of the corresponding installation section of the piston rod, the inner wall of the buffer sleeve is in clearance fit with the outer wall of the installation section of the buffer sleeve, a buffer hole is arranged on a cylinder cover of the hydraulic cylinder, a rod cavity of the hydraulic cylinder is communicated with an oil return port through the buffer hole, the outer wall of the cylindrical buffer sleeve is in clearance fit with the inner wall of the buffer hole, when the piston rod approaches to a terminal, the cylindrical buffer sleeve slides into the buffer hole to gradually block the oil return port, the internal buffer device has simple structure and small volume, and does not need to additionally add any hydraulic elements such as a flow control valve and the like, therefore, the buffering mode is an ideal buffering mode, but the floating buffering principle is the process of firstly utilizing end face sealing constant throttling and then returning oil through a floating gap of the buffering sleeve, the buffering effect is good at the beginning in the whole buffering process, the effect is poor when the buffering is finished, and the following defects exist: 1. the length of the buffer sleeve is smaller than the length of the buffer sleeve mounting section, the buffer sleeve can incline in the movement process, and the buffer sleeve is easy to block when entering a buffer hole of a cylinder cover; 2. the starting process has the phenomena of shaking and crawling; 3. a great pressure impact exists in the buffering process; 4. the starting pressure when the piston rod is retracted is large.
Disclosure of Invention
The utility model aims at providing an adjustable buffer cylinder to solve prior art's buffer cylinder and take place the big scheduling problem of starting pressure when the card is dead, the piston rod withdrawal easily at the buffering in-process.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is:
an adjustable buffer oil cylinder comprises a cylinder bottom, a cylinder barrel and a cylinder head which are sequentially connected, wherein the rear end of a piston rod is provided with a buffer sleeve mounting section and a piston mounting section, the outer diameters of the buffer sleeve mounting section and the piston mounting section are sequentially reduced, a piston which is matched with the cylinder barrel to slide in a sleeved mode is arranged on the piston mounting section in a sleeved mode, a buffer sleeve is arranged on the buffer sleeve mounting section in a sleeved mode, and two ends of the buffer sleeve are respectively abutted to a shaft shoulder of the piston and a shaft shoulder of the piston rod; the piston divides the cylinder barrel into a rod cavity and a rodless cavity, a rodless cavity oil port is arranged on one side of the rodless cavity on the cylinder barrel, a rod cavity oil port communicated with a cylinder head hole is arranged on the side wall of the cylinder head, a buffer hole is arranged on the cylinder head hole close to the rod cavity, and the rod cavity is communicated with the rod cavity oil port through the buffer hole; the cylinder end hole that its front end can follow the cylinder end when the piston rod moved stretches out, and when the cushion collar moved to the cushion collar in, the outer wall and the cushion collar inner wall clearance fit of cushion collar, its characterized in that: one end of the buffer hole, which is close to the rod cavity, is provided with a first conical inclined plane, and the diameter of the first conical inclined plane is gradually enlarged towards the rod cavity; one end of the buffer sleeve, which is close to the buffer hole, is provided with a second conical inclined surface, and the diameter of the second conical inclined surface is gradually reduced towards the direction of the buffer hole; the buffer sleeve is provided with at least one axial through hole communicated with the rod cavity, one section of the axial through hole close to the piston is a spring mounting hole, the other section of the axial through hole is an oil passing hole, the diameter of the spring mounting hole is larger than that of the oil passing hole, a steel ball and a spring are arranged in the spring mounting hole, the spring presses the steel ball against the joint of the oil passing hole and the spring mounting hole to seal the oil passing hole, and a radial groove is formed in the end face, abutted to the piston, of the buffer sleeve and between the spring mounting hole and the outer side face of the buffer sleeve.
In the adjustable buffer oil cylinder, an axial throttle hole is arranged on the cylinder head close to the rod cavity, an adjusting hole which is coaxial with the throttle hole and has a diameter larger than that of the throttle hole is arranged on the cylinder head far away from the rod cavity, an adjusting rod is arranged in the adjusting hole, the front end of the adjusting rod is a conical head, a threaded section is arranged at the rear end of the adjusting rod, an internal thread is arranged at one end of the adjusting hole far away from the throttle hole and is matched with the threaded section, and after the adjusting rod is screwed into the adjusting hole, the conical surface of the conical head at the front end of the adjusting rod can abut against the combining part of the throttle hole and the adjusting hole to block the throttle hole; when the throttling hole is in a blocking state, the diameter of a section of the adjusting rod, which is positioned between the conical head and the oil port of the rod cavity, is smaller than that of the adjusting hole.
Furthermore, an annular groove is formed in the adjusting rod, and a sealing ring is arranged in the annular groove.
Has the advantages that:
1. the two ends of the buffer sleeve are abutted and fixed on the piston rod, and the guide effect of the first conical inclined surface of the buffer hole is added, so that the buffer sleeve can be effectively prevented from being blocked in the process of entering the buffer hole;
2. the front end of the buffer sleeve is provided with the second conical inclined surface, so that the sudden sharp increase of oil pressure can be prevented, and the pressure impact is reduced;
3. when the buffer sleeve starts to enter the buffer hole, oil can only flow into the oil port of the rod cavity from the gap between the buffer sleeve and the buffer hole, so that the buffer effect is ensured; when the piston rod retracts, oil can flow into the rod cavity from a gap between the buffer sleeve and the buffer hole, and a spring in the buffer sleeve can be compressed to enter the rod cavity from the oil through hole, the spring mounting hole and the radial groove, so that the oil cylinder can be quickly opened, and the oil cylinder is prevented from shaking and creeping;
4. the throttle hole can be plugged or opened by rotating the adjusting rod, so that the oil cylinder has buffering and no buffering; the opening of the throttling hole can be changed by rotating the adjusting rod, and the throttling hole is matched with the buffer sleeve and the buffer hole for use, so that the buffer effect of the oil cylinder is adjusted.
Drawings
Fig. 1 is a schematic overall sectional view of the present invention (piston rod and piston are retracted to the end of stroke).
Fig. 2 is a schematic partial sectional view of one end of the cylinder head according to the present invention (the piston rod and the piston extend to the end of the stroke).
Fig. 3 is a schematic cross-sectional view of the middle cushion collar of the present invention.
Fig. 4 is a left side view of the buffer sleeve of the present invention.
Fig. 5 is a schematic partial sectional view of one end of the cylinder head according to the present invention (after removing the piston rod, the piston, the cushion collar and the adjusting rod).
Fig. 6 is a schematic view of the adjusting lever of the present invention.
In the figure: 1, the bottom of the cylinder is provided with a cylinder,
2 cylinder barrel, 2-1 rodless cavity oil port, 2-2 rod cavity oil port,
3, a piston is arranged on the piston,
4 buffer sleeves, 4-1 spring, 4-2 spring mounting holes, 4-3 steel balls, 4-4 oil passing holes, 4-5 second conical inclined planes, 4-6 radial grooves,
5 a piston rod is arranged on the piston rod,
6 cylinder heads, 6-1 buffer holes, 6-2 first conical inclined planes, 6-3 throttling holes, 6-4 adjusting holes,
7 adjusting rod, 7-1 conical head, 7-2 annular groove, 7-3 thread section,
8 rodless cavities and 9 rod cavities.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is further described below by way of non-limiting examples in combination with the accompanying drawings.
Referring to fig. 1 to 6, an adjustable buffer cylinder includes a cylinder bottom 1, a cylinder barrel 2 and a cylinder head 6 which are connected in sequence, a buffer sleeve mounting section and a piston mounting section with sequentially reduced outer diameters are arranged at the rear end of a piston rod 5, a piston 3 which is slidably fitted in the cylinder barrel 2 is sleeved on the piston mounting section, a buffer sleeve 4 is sleeved on the buffer sleeve mounting section, and two ends of the buffer sleeve 4 are respectively abutted to shaft shoulders of the piston 3 and the piston rod 5; the piston 3 divides the cylinder barrel 2 into a rod cavity 9 and a rodless cavity 8, a rodless cavity oil port 2-1 is arranged on one side of the rodless cavity 8 on the cylinder barrel 2, a rod cavity oil port 2-2 communicated with a cylinder head hole is arranged on the side wall of the cylinder head 6, a buffer hole 6-1 is arranged on the cylinder head 6 close to the cylinder head hole with the rod cavity 9, a sealing component is arranged between the piston rod 5 and the cylinder head 6, the diameter of the cylinder head hole between the sealing component and the buffer hole 6-1 is larger than that of the buffer hole 6-1, and the rod cavity 9 is communicated with the rod cavity oil port 2-2 through the buffer hole 6-1; when the piston rod 5 moves, the front end of the piston rod can extend out of a cylinder head hole of the cylinder head 6, when the buffer sleeve 4 moves into the buffer hole 6-1, the outer wall of the buffer sleeve 4 is in clearance fit with the inner wall of the buffer hole 6-1, one end of the buffer hole 6-1, which is close to the rod cavity 9, is provided with a first conical inclined surface 6-2, and the diameter of the first conical inclined surface 6-2 gradually enlarges towards the rod cavity 9; one end of the buffer sleeve 4 close to the buffer hole 6-1 is provided with a second conical inclined surface 4-5, and the diameter of the second conical inclined surface 4-5 is gradually reduced towards the direction of the buffer hole 6-1; an axial through hole communicated with the rod cavity 9 is formed in the buffer sleeve 4, one section of the axial through hole, close to the piston 3, is a spring mounting hole 4-2, the other section of the axial through hole is an oil passing hole 4-4, the diameter of the spring mounting hole 4-2 is larger than that of the oil passing hole 4-4, a steel ball 4-3 and a spring 4-1 are arranged in the spring mounting hole 4-2 to form a one-way valve structure, the spring 4-1 presses the steel ball 4-3 against the joint of the oil passing hole 4-4 and the spring mounting hole 4-2 to block the oil passing hole 4-4, and a radial groove 4-6 is formed in the end face, abutted to the piston 3, of the buffer sleeve 4 and between the spring mounting hole 4-2 and the outer side face of the buffer sleeve 4.
An axial throttling hole 6-3 is formed in the position, close to the rod cavity 9, of the cylinder head 6, an adjusting hole 6-4 which is coaxial with the throttling hole 6-3 and is larger than the throttling hole 6-3 in diameter is formed in the position, far away from the rod cavity 9, of the cylinder head 6, an adjusting rod 7 is arranged in the adjusting hole 6-4, the front end of the adjusting rod 7 is a conical head 7-1, a threaded section 7-3 is arranged at the rear end of the adjusting rod 7, internal threads are formed in one end, far away from the throttling hole 6-3, of the adjusting hole 6-4 and are matched with the threaded section 7-3, and after the adjusting rod 7 is screwed into the adjusting hole 6-4, the conical surface of the conical head 7-1 at the front end of the adjusting rod can abut against the combination part of the throttling hole 6-3 and the adjusting hole 6-4 to block the throttling hole 6-3; when the throttling hole 6-3 is in a blocking state, the diameter of a section of the adjusting rod 7, which is positioned between the conical head 7-1 and the oil port 2-2 of the rod cavity, is smaller than that of the adjusting hole 6-4. The adjusting rod 7 is provided with an annular groove 7-2, and a sealing ring is arranged in the annular groove 7-2.
The working process is as follows:
when the orifice is plugged by the adjusting rod:
referring to fig. 1, when oil enters from an oil port 2-1 of a rodless cavity, oil in a rodless cavity 8 pushes a piston 3 to drive a buffer sleeve 4 and a piston rod 5 to rapidly move rightwards together, hydraulic oil in a rod cavity 9 enters an oil port 2-2 of the rod cavity through a buffer hole 6-1, when the piston rod 5 extends rightwards and moves until the buffer sleeve 4 enters the buffer hole 6-1, referring to fig. 2, the hydraulic oil in the rod cavity 9 can only enter the oil port 2-2 of the rod cavity through a gap between the outer wall of the buffer sleeve 4 and the buffer hole 6-1, and the gap is suddenly reduced, so that the rod cavity 9 generates great back pressure to slowly decelerate the piston 3, and a second conical inclined surface 4-5 is arranged on the buffer sleeve 4, so that the sudden sharp increase of the oil pressure can be prevented, and the pressure impact is reduced; until the end surface of the piston 3 is jointed with the cylinder head 6, the soft landing of the extending end part of the piston 3 is realized. When the piston rod 5 retracts, the spring 4-1 is compressed under the action of oil return pressure, oil can flow into the rod cavity 9 from a gap between the buffer sleeve 4 and the buffer hole 6-1, and can also flow into the rod cavity 9 from the oil passing hole 4-4 through the spring mounting hole 4-2 and the radial groove 4-6, so that the oil cylinder can be quickly opened, and the oil cylinder is prevented from shaking and creeping.
When the regulating rod opens the throttling hole:
when oil enters the rodless cavity oil port 2-1, the oil in the rodless cavity 8 pushes the piston 3 to drive the buffer sleeve 4 and the piston rod 5 to rapidly move rightwards together, hydraulic oil in the rod cavity 9 simultaneously enters the rod cavity oil port 2-2 through the buffer hole 6-1 and the orifice 6-3, when the piston rod 5 extends rightwards to move until the buffer sleeve 4 enters the buffer hole 6-1, please see fig. 2, a part of the hydraulic oil in the rod cavity 9 enters the rod cavity oil port 2-2 through a gap between the outer wall of the buffer sleeve 4 and the buffer hole 6-1, and a part of the hydraulic oil enters the rod cavity oil port 2-2 through the orifice 6-3, almost no buffer exists, the end face of the piston 3 is attached to the cylinder head 6, and the piston rod 5 rapidly extends to the maximum stroke. Similarly, when the piston rod 5 retracts, the oil can flow into the rod chamber 9 from the gap between the buffer sleeve 4 and the buffer hole 6-1, and can also directly enter the rod chamber 9 from the throttle hole 6-3, so that the oil cylinder can be quickly opened, and the piston rod 5 can be quickly retracted.
In addition to the technical features described in the specification, the technology is known to those skilled in the art.
The above-mentioned embodiments are only for understanding the present invention, and are not intended to limit the technical solutions of the present invention, and those skilled in the relevant art can make various changes or modifications based on the technical solutions described in the claims, and all equivalent changes or modifications should be covered by the scope of the claims of the present invention.
Claims (3)
1. An adjustable buffer oil cylinder comprises a cylinder bottom, a cylinder barrel and a cylinder head which are sequentially connected, wherein the rear end of a piston rod is provided with a buffer sleeve mounting section and a piston mounting section, the outer diameters of the buffer sleeve mounting section and the piston mounting section are sequentially reduced, a piston which is matched with the cylinder barrel to slide in a sleeved mode is arranged on the piston mounting section in a sleeved mode, a buffer sleeve is arranged on the buffer sleeve mounting section in a sleeved mode, and two ends of the buffer sleeve are respectively abutted to a shaft shoulder of the piston and a shaft shoulder of the piston rod; the piston divides the cylinder barrel into a rod cavity and a rodless cavity, a rodless cavity oil port is arranged on one side of the rodless cavity on the cylinder barrel, a rod cavity oil port communicated with a cylinder head hole is arranged on the side wall of the cylinder head, a buffer hole is arranged on the cylinder head hole close to the rod cavity, and the rod cavity is communicated with the rod cavity oil port through the buffer hole; the cylinder end hole that its front end can follow the cylinder end when the piston rod moved stretches out, and when the cushion collar moved to the cushion collar in, the outer wall and the cushion collar inner wall clearance fit of cushion collar, its characterized in that: one end of the buffer hole, which is close to the rod cavity, is provided with a first conical inclined plane, and the diameter of the first conical inclined plane is gradually enlarged towards the rod cavity; one end of the buffer sleeve, which is close to the buffer hole, is provided with a second conical inclined surface, and the diameter of the second conical inclined surface is gradually reduced towards the direction of the buffer hole; the buffer sleeve is provided with at least one axial through hole communicated with the rod cavity, one section of the axial through hole close to the piston is a spring mounting hole, the other section of the axial through hole is an oil passing hole, the diameter of the spring mounting hole is larger than that of the oil passing hole, a steel ball and a spring are arranged in the spring mounting hole, the spring presses the steel ball against the joint of the oil passing hole and the spring mounting hole to seal the oil passing hole, and a radial groove is formed in the end face, abutted to the piston, of the buffer sleeve and between the spring mounting hole and the outer side face of the buffer sleeve.
2. The adjustable cushion cylinder of claim 1, wherein: an axial throttling hole is formed in the cylinder head close to the rod cavity, an adjusting hole which is coaxial with the throttling hole and has a diameter larger than that of the throttling hole is formed in the cylinder head far away from the rod cavity, an adjusting rod is arranged in the adjusting hole, the front end of the adjusting rod is a conical head, a threaded section is arranged at the rear end of the adjusting rod, an internal thread is arranged at one end of the adjusting hole far away from the throttling hole and is matched with the threaded section, and after the adjusting rod is screwed into the adjusting hole, the conical surface of the conical head at the front end of the adjusting rod can abut against the combining part of the throttling hole and the adjusting hole to block the throttling hole; when the throttling hole is in a blocking state, the diameter of a section of the adjusting rod, which is positioned between the conical head and the oil port of the rod cavity, is smaller than that of the adjusting hole.
3. The adjustable cushion cylinder of claim 2, wherein: the adjusting rod is provided with an annular groove, and a sealing ring is arranged in the annular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120323303.2U CN214578023U (en) | 2021-02-05 | 2021-02-05 | Adjustable buffer oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120323303.2U CN214578023U (en) | 2021-02-05 | 2021-02-05 | Adjustable buffer oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214578023U true CN214578023U (en) | 2021-11-02 |
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ID=78349992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120323303.2U Active CN214578023U (en) | 2021-02-05 | 2021-02-05 | Adjustable buffer oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214578023U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045889A (en) * | 2022-08-15 | 2022-09-13 | 烟台山河液压部件有限公司 | Shock attenuation hydraulic cylinder |
-
2021
- 2021-02-05 CN CN202120323303.2U patent/CN214578023U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045889A (en) * | 2022-08-15 | 2022-09-13 | 烟台山河液压部件有限公司 | Shock attenuation hydraulic cylinder |
| CN115045889B (en) * | 2022-08-15 | 2022-10-25 | 烟台山河液压部件有限公司 | Shock attenuation hydraulic cylinder |
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Effective date of registration: 20240402 Address after: 276000 East Longfeng Road, Yishui County, Linyi City, Shandong Province Patentee after: Yishui Rongsheng Machinery Co.,Ltd. Country or region after: China Address before: 250101 2-603, Xinsheng building, 1299 Xinluo street, high tech Zone, Jinan City, Shandong Province Patentee before: Jinan Huachen Industrial Co.,Ltd. Country or region before: China |