CN110617252A - Spiral cavity coupling buffer bucket rod oil cylinder - Google Patents
Spiral cavity coupling buffer bucket rod oil cylinder Download PDFInfo
- Publication number
- CN110617252A CN110617252A CN201811629923.8A CN201811629923A CN110617252A CN 110617252 A CN110617252 A CN 110617252A CN 201811629923 A CN201811629923 A CN 201811629923A CN 110617252 A CN110617252 A CN 110617252A
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- Prior art keywords
- cavity
- buffer
- cylinder
- thread groove
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000008878 coupling Effects 0.000 title claims abstract description 22
- 238000010168 coupling process Methods 0.000 title claims abstract description 22
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 22
- 230000003139 buffering effect Effects 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 13
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 4
- 241001330002 Bambuseae Species 0.000 claims description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 4
- 239000011425 bamboo Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 239000003921 oil Substances 0.000 abstract description 25
- 230000000694 effects Effects 0.000 abstract description 7
- 239000010720 hydraulic oil Substances 0.000 abstract description 7
- 230000001808 coupling effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- F15B15/227—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having an auxiliary cushioning piston within the main piston or the cylinder end face
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 oil cylinder, and aims to solve the problem of up-and-down buffering of an oil cylinder of a bucket rod of an excavator. The screw cavity coupling buffer bucket rod oil cylinder comprises a cylinder body assembly and a piston rod assembly, wherein the cylinder body assembly comprises a cylinder cover, a cylinder and a cylinder head, the piston rod assembly comprises a piston and a piston rod, the piston divides the inner space of the cylinder body assembly into a rod cavity and a rodless cavity, the upper buffer cavity is formed in the side of the rod cavity of the cylinder cover, and the lower buffer cavity is formed in the center of the end face of the rodless cavity of the cylinder head. An upper buffer sleeve is arranged on the side of the rod cavity of the piston rod, a lower buffer plunger is arranged in the center of the end face of the rodless cavity of the piston rod, gradually-changed thread grooves are formed in the upper buffer sleeve and the lower buffer plunger, and a micro-concave cavity is formed in a non-thread groove processing area. When the oil cylinder enters an upper buffer (a lower buffer plunger), the center of the upper buffer sleeve (the lower buffer plunger) is automatically adjusted in the buffering process due to the coupling effect of the micro-pressure effect of the micro-concave cavity on the upper buffer sleeve (the lower buffer plunger) and the macro dynamic pressure effect of the gradually-changed thread groove; the gradual change thread groove on the upper buffer sleeve (lower buffer plunger) ensures the stable change of the pressure of the buffer cavity in the buffer process.
Description
Technical Field
The invention relates to a hydraulic oil cylinder, in particular to a spiral cavity coupling buffer bucket rod oil cylinder.
Background
In the process of rapid movement of the hydraulic cylinder, strong impact, noise and even mechanical collision can be generated at the stroke end, particularly under the condition of high pressure, the impact is more obvious, the service life of the hydraulic cylinder is seriously influenced, therefore, proper buffering and braking must be carried out before the movement is finished to ensure the service lives of a hydraulic system and the hydraulic cylinder, generally common buffering comprises in-cylinder buffering and out-cylinder buffering, however, the out-cylinder buffering can increase the complexity of the whole hydraulic system and the cost of the whole hydraulic system, the in-cylinder buffering has a simple structure and small volume, and no additional hydraulic elements such as any flow control valve are needed to be added, so that the hydraulic cylinder is an ideal buffering mode.
The existing bucket rod oil cylinder is mostly provided with an upper buffer structure and a lower buffer structure, the upper buffer adopts a buffer sleeve and an upper buffer cavity to form a buffer gap in the buffer process, and the lower buffer adopts a buffer plunger and a lower buffer cavity to form a buffer gap in the buffer process to realize the defect of the buffer: 1) the concentricity requirements of the buffer sleeve, the buffer plunger and the buffer cavity are high, and the concentricity requirement in the buffer process cannot be met by automatically adjusting the buffer sleeve and the buffer plunger; 2) at the moment of buffering, the pressure of the buffer cavity is instantly and rapidly increased to be more than 3 times of the working pressure at most, the service life of the oil cylinder is influenced, and after the buffer cavity enters the buffer cavity, the pressure of the buffer cavity is rapidly reduced, so that the buffer effect is reduced.
Disclosure of Invention
The invention aims to provide a screw cavity coupling buffer bucket rod oil cylinder which not only can automatically adjust a buffer sleeve and a buffer plunger to achieve concentricity with a buffer cavity in the buffer process, but also can solve the problems that the pressure of the buffer cavity rises too violently at the moment of entering the buffer, and the pressure of the buffer cavity drops rapidly after entering the buffer, and the like.
In order to solve the problems, the invention adopts the technical scheme that: this kind of spiral chamber coupling buffering dipper pole hydro-cylinder includes cylinder body subassembly and piston rod subassembly, the cylinder body subassembly comprises cylinder cap, a section of thick bamboo and cylinder head, the piston rod subassembly comprises piston and piston rod, and the one end and the piston connection of piston rod adopt lock nut locking, and the hydro-cylinder outside is stretched out from the cylinder cap to one end in addition, the piston will cylinder body subassembly inner space is separated into has pole chamber and no pole chamber, has set up on the section of thick bamboo and has had the communicating hydraulic fluid port of going up in pole chamber, has set up on the cylinder head with the communicating lower hydraulic fluid port in no pole chamber, and the cylinder cap has pole chamber side to offer and goes up the cushion chamber, and the cushion chamber is down established to the no pole chamber side end face.
In the screw cavity coupling buffer bucket rod oil cylinder, the rod cavity side of the piston rod is provided with two steps, a buffer sleeve is arranged on the step close to the piston, a gap exists between the upper buffer sleeve and the piston rod, the upper buffer sleeve is provided with N gradually-changed thread grooves, the side close to the piston is provided with a shallow thread groove, the side close to the cylinder cover is provided with a deep thread groove, and the non-thread groove processing area of the upper buffer sleeve is provided with a micro-cavity.
In the screw cavity coupling buffer bucket rod oil cylinder, the center of the end face of the rodless cavity side of the piston rod is provided with a lower buffer plunger mounting hole, the lower buffer plunger is mounted in the lower buffer plunger mounting hole through a clamping ring, the lower buffer plunger is provided with M gradually-changed thread grooves, a shallow thread groove is formed on the side close to the piston, a deep thread groove is formed on the side close to the cylinder head, and a micro-concave cavity is formed in the non-thread groove processing area of the lower buffer plunger.
In the spiral cavity coupling buffer bucket rod oil cylinder, the shape of the micro concave cavity is spherical or ellipsoidal, the maximum diameter of the micro concave cavity is not more than 300um, the maximum depth of the micro concave cavity is not more than 100um, the ratio alpha of the open cavity area of the micro concave cavity is not less than 0.1,
in the screw cavity coupling buffer bucket rod oil cylinder, the thread groove is a gradually-changed thread groove, the shape of the thread groove can be triangular, trapezoidal and semicircular, the ratio of the grooving depth of the thread groove is beta,wherein, the ratio of the depth of the groove at the shallowest part is not less than 0.5 percent, the ratio of the depth of the groove at the deepest part is not more than 5 percent, and the depth of the groove is a gradual change process.
In the screw cavity coupling buffer bucket rod oil cylinder, the outer circular surface of the upper buffer sleeve close to the cylinder cover side is provided with a cone angle in a range of 5-30 degrees, and the outer circular surface of the lower buffer plunger close to the cylinder head is provided with a cone angle in a range of 5-30 degrees.
In the screw cavity coupling buffer bucket rod oil cylinder, the bottom of the buffer cavity on the cylinder cover is provided with a through hole, the through hole is connected with the upper buffer cavity and the upper oil port, and the bottom of the lower buffer cavity is communicated with the lower oil port.
In the above-mentioned spiral cavity coupling buffering dipper hydro-cylinder, the theory of operation of spiral cavity coupling: when the oil cylinder enters an upper buffering (lower buffering) stage, the center of the upper buffering sleeve (lower buffering plunger) can be automatically adjusted in the buffering process due to the coupling effect of the micro-pressure effect of the micro-concave cavity on the upper buffering sleeve (lower buffering plunger) and the macroscopic dynamic pressure effect of the gradually-changed thread groove; go up the thread groove on cushion collar (lower buffering plunger) and can not only increase hydraulic oil flow resistance in the buffer process, reinforcing buffering effect, be gradual change because of the thread groove moreover for buffer clearance (buffer clearance contains the thread groove) among the buffer process diminishes gradually, guarantees in the twinkling of an eye that just gets into the buffering, and the pressure rise of cushion chamber can not be too violent, gets into the buffering back, and cushion chamber pressure can not descend rapidly again.
In the screw cavity coupling buffer bucket rod oil cylinder, the working principle of oil cylinder buffering is as follows: when the piston rod assembly moves to the cylinder cover accessory, the upper buffer sleeve and the upper buffer cavity form an upper buffer gap which has a damping effect, the speed of hydraulic oil flowing out of the rod cavity is reduced, and the hydraulic oil pressure of the rod cavity is improved, so that the speed of the piston rod assembly when the ascending stroke is ended is reduced, and the upper buffer is realized; when the piston rod assembly moves to the position near the cylinder head, the lower buffering plunger and the lower buffering sleeve form a lower buffering gap, the lower buffering gap has a damping effect, the speed of hydraulic oil flowing out of the rodless cavity is reduced, the hydraulic oil pressure of the rodless cavity is improved, the speed of the piston rod assembly when a descending stroke is ended is reduced, and lower buffering is achieved.
Drawings
FIG. 1 is a front view of a screw cavity coupled buffer dipper handle cylinder of the present invention
FIG. 2 is a view showing a structure of a cushion cover
FIG. 3 is a view showing the structure of a lower cushion plunger
FIG. 4 is a schematic view showing a structure of a micro-cavity formed on the outer circumferential surface of an upper buffer sleeve (a lower buffer plunger)
Part names and serial numbers in the figure: the hydraulic cylinder comprises a piston rod 1, a cylinder cover 2, a cylinder 3, a rod cavity 4, an upper buffer sleeve 5, a piston 6, a rodless cavity 7, a lock nut 8, a lower buffer plunger 9, a lower buffer cavity 10, a lower oil port 11, a cylinder head 12, a clamping ring 13, an upper buffer cavity 14, a through hole 15 and an upper oil port 16.
Detailed Description
The following description of the embodiments refers to the accompanying drawings.
As shown in fig. 1, the screw cavity coupling buffering dipper handle oil cylinder in this embodiment includes a cylinder body assembly and a piston rod assembly, the cylinder body assembly comprises a cylinder cover 2, a barrel 3 and a cylinder head 12, the piston rod assembly comprises a piston 6 and a piston rod 1, one end of the piston rod 1 is connected with the piston 6, and is locked by a lock nut 8, and the other end stretches out of the oil cylinder from the cylinder cover 2, the piston 6 separates the internal space of the cylinder body assembly into a rod cavity 4 and a rodless cavity 7, the barrel 3 is provided with an upper oil port 16 communicated with the rod cavity 4, the cylinder head 12 is provided with a lower oil port 11 communicated with the rodless cavity 7, the cylinder cover 2 is provided with the rod cavity side and is provided with an upper buffering cavity 14, and the center of the rodless cavity side end surface of the cylinder head 12 is provided with a lower buffering.
As shown in fig. 1, the rod cavity side of the piston rod 1 has two steps, the step near the piston is provided with the buffer sleeve 5, a gap exists between the upper buffer sleeve 5 and the piston rod 1, the upper buffer sleeve 5 is provided with a gradual change thread groove 1, the side near the piston is provided with a shallow thread groove, and the side near the cylinder cover is provided with a deep thread groove, as shown in fig. 2, the structure of the upper buffer sleeve is schematically illustrated. A micro-concave cavity is formed in a non-threaded groove processing area of the upper buffer sleeve 5, and as shown in fig. 4, a structural schematic diagram of the micro-concave cavity formed on the outer circumferential surface of the upper buffer sleeve 5 is shown.
As shown in fig. 1, a lower buffering plunger mounting hole is formed in the center of the end face of the rodless cavity side of the piston rod 1, the lower buffering plunger 9 is mounted in the lower buffering plunger mounting hole through a snap ring 13, a gradual change thread groove 1 is formed in the lower buffering plunger 9, a shallow thread groove is formed on the side close to the piston, a deep thread groove is formed on the side close to the cylinder head, and as shown in fig. 3, the lower buffering plunger 9 is a schematic structural diagram. A micro-concave cavity is formed in a non-thread groove processing area of the lower buffering plunger 9, and as shown in fig. 4, a structural schematic diagram of the micro-concave cavity formed on the outer circumferential surface of the lower buffering plunger 9 is shown.
As shown in fig. 4, the shape of the micro-cavity is spherical or ellipsoidal, the diameter of the micro-cavity is 30um, the maximum depth of the micro-cavity is 20um, the ratio alpha of the open area of the micro-cavity is 0.2,
as shown in fig. 2 and 3, the thread groove is a gradual change thread groove, the shape of the thread groove can be triangular, the ratio of the groove depth of the thread groove is beta,the ratio of the depth of the groove at the shallowest part is 0.2%, the ratio of the depth of the groove at the deepest part is 2%, and the groove depth is a gradual change process.
As shown in fig. 2, the outer circular surface of the upper cushion collar 5 near the cylinder head side is provided with a taper angle of 15 °, and as shown in fig. 3, the outer circular surface of the lower cushion plunger 9 near the cylinder head side is provided with a taper angle of 5 °.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but includes equivalent technical means as would be recognized by those skilled in the art based on the inventive concept.
Claims (6)
1. Screw chamber coupling buffering dipper hydro-cylinder, including cylinder body subassembly and piston rod subassembly, the cylinder body subassembly comprises cylinder cap, a section of thick bamboo and cylinder head, the piston rod subassembly comprises piston and piston rod, and the one end and the piston connection of piston rod adopt lock nut locking, and the hydro-cylinder outside is stretched out from the cylinder cap to one end in addition, the piston will cylinder body subassembly inner space is separated into has pole chamber and no pole chamber, has set up on the section of thick bamboo and has had the communicating hydraulic fluid port of going up in pole chamber, has set up on the cylinder head with the communicating hydraulic fluid port down in no pole chamber, and the cylinder cap has pole chamber side to offer and goes up the cushion chamber, and the cushion chamber is down established to the no pole chamber side end face center of.
2. The screw cavity coupling buffer bucket rod oil cylinder according to claim 1, wherein the rod cavity side of the piston rod is provided with two steps, the buffer sleeve is arranged on the step close to the piston, a gap exists between the upper buffer sleeve and the piston rod, N axial gradually-changed thread grooves are formed in the outer circumferential surface of the upper buffer sleeve, a shallow thread groove is formed on the side close to the piston, a deep thread groove is formed on the side close to the cylinder cover, and a micro-concave cavity is formed in the non-thread groove processing area of the upper buffer sleeve.
3. The screw cavity coupling buffer bucket rod oil cylinder according to claim 1, wherein a lower buffer plunger mounting hole is formed in the center of the end face of the rodless cavity side of the piston rod, the lower buffer plunger is mounted in the lower buffer plunger mounting hole through a clamping ring, M axial gradually-changed thread grooves are formed in the outer circumferential surface of the lower buffer plunger, a shallow thread groove is formed on the side close to the piston, a deep thread groove is formed on the side close to the cylinder head, and a micro-concave cavity is formed in the non-thread groove processing area of the lower buffer plunger.
4. The screw cavity coupling buffer bucket rod oil cylinder of claim 2 or 3, wherein the micro-cavity is spherical or ellipsoidal, the maximum diameter of the micro-cavity is not more than 300um, the maximum depth of the micro-cavity is not more than 100um, the ratio alpha of the open area of the micro-cavity is not less than 0.1,
5. the screw cavity coupling buffer bucket rod oil cylinder according to claim 2 and 3, wherein the thread groove is a gradually-changing thread groove, the shape of the thread groove can be triangular, trapezoidal and semicircular, the ratio of the groove depth of the thread groove is beta,the ratio of the depth of the groove at the shallowest part is not less than 0.5%, the ratio of the depth of the groove at the deepest part is not more than 5%, and the groove depth is a gradual change process.
6. The screw cavity coupling buffer bucket rod oil cylinder as claimed in claim 2 and 3, wherein the outer circular surface of the upper buffer sleeve near the cylinder cover is provided with a taper angle in the range of 5-30 °, and the outer circular surface of the lower buffer plunger near the cylinder head is provided with a taper angle in the range of 5-30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811629923.8A CN110617252A (en) | 2018-12-20 | 2018-12-20 | Spiral cavity coupling buffer bucket rod oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811629923.8A CN110617252A (en) | 2018-12-20 | 2018-12-20 | Spiral cavity coupling buffer bucket rod oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110617252A true CN110617252A (en) | 2019-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811629923.8A Pending CN110617252A (en) | 2018-12-20 | 2018-12-20 | Spiral cavity coupling buffer bucket rod oil cylinder |
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| CN (1) | CN110617252A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006114048A1 (en) * | 2005-04-25 | 2006-11-02 | Yangdong He | A cushion mehanism in a hydraulic piston cylinder |
| CN201636116U (en) * | 2010-03-10 | 2010-11-17 | 无锡市长江液压缸厂 | Gap cushioning hydraulic cylinder |
| CN201671909U (en) * | 2010-06-13 | 2010-12-15 | 金湘江 | Gradually-close spiral cushion collar-type hydraulic cylinder |
| CN202144813U (en) * | 2011-05-08 | 2012-02-15 | 龙工(上海)液压有限公司 | Excavator hydraulic cylinder with buffer device |
| US20130209296A1 (en) * | 2010-07-23 | 2013-08-15 | Hunan Sany Intelligent Control Equipment Co., Ltd. | Hydraulic Oil Cylinder, Correlative Device Thereof, Hydraulic Cushion System, Excavator And Concrete Pump Truck |
| CN104389850A (en) * | 2014-10-21 | 2015-03-04 | 柳州柳工液压件有限公司 | Oil cylinder with floating buffer structure |
| CN209761913U (en) * | 2018-12-20 | 2019-12-10 | 湖南机电职业技术学院 | Spiral cavity coupling buffer bucket rod oil cylinder |
-
2018
- 2018-12-20 CN CN201811629923.8A patent/CN110617252A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006114048A1 (en) * | 2005-04-25 | 2006-11-02 | Yangdong He | A cushion mehanism in a hydraulic piston cylinder |
| CN201636116U (en) * | 2010-03-10 | 2010-11-17 | 无锡市长江液压缸厂 | Gap cushioning hydraulic cylinder |
| CN201671909U (en) * | 2010-06-13 | 2010-12-15 | 金湘江 | Gradually-close spiral cushion collar-type hydraulic cylinder |
| US20130209296A1 (en) * | 2010-07-23 | 2013-08-15 | Hunan Sany Intelligent Control Equipment Co., Ltd. | Hydraulic Oil Cylinder, Correlative Device Thereof, Hydraulic Cushion System, Excavator And Concrete Pump Truck |
| CN202144813U (en) * | 2011-05-08 | 2012-02-15 | 龙工(上海)液压有限公司 | Excavator hydraulic cylinder with buffer device |
| CN104389850A (en) * | 2014-10-21 | 2015-03-04 | 柳州柳工液压件有限公司 | Oil cylinder with floating buffer structure |
| CN209761913U (en) * | 2018-12-20 | 2019-12-10 | 湖南机电职业技术学院 | Spiral cavity coupling buffer bucket rod oil cylinder |
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