CN209761913U - Spiral cavity coupling buffer bucket rod oil cylinder - Google Patents
Spiral cavity coupling buffer bucket rod oil cylinder Download PDFInfo
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- CN209761913U CN209761913U CN201822229319.8U CN201822229319U CN209761913U CN 209761913 U CN209761913 U CN 209761913U CN 201822229319 U CN201822229319 U CN 201822229319U CN 209761913 U CN209761913 U CN 209761913U
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Abstract
The utility model relates to a hydraulic cylinder, for solving excavator dipper hydro-cylinder upper and lower buffering problem. 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.
most of the existing bucket rod oil cylinders are provided with an upper buffer structure and a lower buffer structure, the upper buffer is realized by forming a buffer gap between a buffer sleeve and an upper buffer cavity in the buffer process, and the lower buffer is realized by forming a buffer gap between a buffer plunger and a lower buffer cavity in the buffer process, so that the buffer is disadvantageous; 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, its characterized in that the piston will cylinder body subassembly inner space separates into there is pole chamber and rodless chamber, has set up on the section of thick bamboo and has 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 rodless chamber, and the cylinder cap has pole chamber side to set up and goes up the cushion chamber, and the cushion chamber is down seted up at cylinder head rodless chamber side end.
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 or 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 according to claim 2 or 3, wherein the outer circular surface of the upper buffer sleeve close to the cylinder cover side is provided with a taper angle in the range of 5 degrees to 30 degrees, and the outer circular surface of the lower buffer plunger close to the cylinder head is provided with a taper angle in the range of 5 degrees to 30 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822229319.8U CN209761913U (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 |
|---|---|---|---|
| CN201822229319.8U CN209761913U (en) | 2018-12-20 | 2018-12-20 | Spiral cavity coupling buffer bucket rod oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209761913U true CN209761913U (en) | 2019-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822229319.8U Expired - Fee Related CN209761913U (en) | 2018-12-20 | 2018-12-20 | Spiral cavity coupling buffer bucket rod oil cylinder |
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| Country | Link |
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| CN (1) | CN209761913U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111043101A (en) * | 2019-12-26 | 2020-04-21 | 长春工业大学 | Adopt rotation type ultrasonic wave nut decoupling zero type nonoculture locking cylinder |
| CN111059097A (en) * | 2019-12-26 | 2020-04-24 | 长春工业大学 | Annular magnetic coupling type linear locking cylinder based on ultrasonic antifriction effect |
| WO2023010202A1 (en) * | 2021-08-06 | 2023-02-09 | Hydra Dyne Technology Inc. | Piston and cylinder device with stroke cushioning |
-
2018
- 2018-12-20 CN CN201822229319.8U patent/CN209761913U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111043101A (en) * | 2019-12-26 | 2020-04-21 | 长春工业大学 | Adopt rotation type ultrasonic wave nut decoupling zero type nonoculture locking cylinder |
| CN111059097A (en) * | 2019-12-26 | 2020-04-24 | 长春工业大学 | Annular magnetic coupling type linear locking cylinder based on ultrasonic antifriction effect |
| CN111059097B (en) * | 2019-12-26 | 2021-09-14 | 长春工业大学 | Annular magnetic coupling type linear locking cylinder based on ultrasonic antifriction effect |
| WO2023010202A1 (en) * | 2021-08-06 | 2023-02-09 | Hydra Dyne Technology Inc. | Piston and cylinder device with stroke cushioning |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191210 Termination date: 20201220 |