CN216842478U - Two-stage hydraulic cylinder easy to machine - Google Patents
Two-stage hydraulic cylinder easy to machine Download PDFInfo
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- CN216842478U CN216842478U CN202220233981.4U CN202220233981U CN216842478U CN 216842478 U CN216842478 U CN 216842478U CN 202220233981 U CN202220233981 U CN 202220233981U CN 216842478 U CN216842478 U CN 216842478U
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Abstract
The utility model discloses an easy-to-machine two-stage hydraulic cylinder, which comprises a cylinder body, a guide sleeve, a primary piston cylinder, a secondary piston cylinder, a central piston rod, a rodless cavity oil port and a rod cavity oil port; the front end of the central piston rod is positioned in the secondary piston cylinder, a piston of the secondary piston cylinder is sleeved outside the central piston rod in a sliding manner, the rear end of the central piston rod is positioned in the primary piston cylinder and is fixedly connected with the rear end of the primary piston cylinder, and the rear end of the primary piston cylinder is provided with an oil hole for communicating the rear end and the inner cavity; the front end of the central piston rod is internally provided with a blind hole, the rear ends of the central piston rod and the primary piston cylinder barrel are internally provided with a retraction oil duct which is communicated with the excircle of the primary piston cylinder barrel and the blind hole, and the secondary piston cylinder barrel is provided with a retraction oil hole which is communicated with the excircle of the secondary piston cylinder barrel. The utility model has the advantages of the oil circuit is simple, low in manufacturing cost to improve the leakproofness of hydro-cylinder.
Description
Technical Field
The utility model relates to a two-stage pneumatic cylinder.
Background
The two-stage hydraulic oil cylinder has a compact structure, and can realize a longer stroke in a given installation space than a single-stage oil cylinder, so that the two-stage hydraulic oil cylinder is widely applied under the condition of tense installation space; according to the two-stage hydraulic oil cylinder adopted at present, the retraction oil path of the second-stage piston cylinder barrel is mostly arranged in the first-stage piston cylinder barrel, holes need to be drilled in the cylinder barrel, or grooves are milled and welded on the cylinder barrel wall, if the stroke of the second-stage piston cylinder barrel is long, the drilling depth is large, the processing difficulty is large, the cylinder barrel wall thickness is increased, and the sealing performance of the oil cylinder is influenced.
Disclosure of Invention
The utility model aims at the above-mentioned not enough that prior art exists, provide an workable two-stage pneumatic cylinder, it has the advantage that the oil circuit is simple, low in manufacturing cost to improve the leakproofness of hydro-cylinder.
In order to achieve the above object, the utility model discloses an workable two-stage pneumatic cylinder, which comprises a cylinder body, the uide bushing, the one-level piston cylinder, second grade piston cylinder and central piston rod, piston and sealing washer have all been set firmly at the rear end of one-level piston cylinder and second grade piston cylinder, be equipped with rodless chamber hydraulic fluid port and have the pole chamber hydraulic fluid port at the cylinder body both ends, be equipped with the second grade uide bushing in the front end of one-level piston cylinder, the front end of second grade piston cylinder is sealed by the kicking block of solid hookup, its characterized in that the front end of central piston rod is located the second grade piston cylinder, the gliding cover of piston of second grade piston cylinder is outside the central piston rod, the rear end of central piston rod is located the one-level piston cylinder and is solid hookup with one-level piston cylinder rear end, the one-level piston rear end is equipped with the oilhole of intercommunication rear end and inner chamber; the front end of the central piston rod is internally provided with a blind hole, the rear ends of the central piston rod and the primary piston cylinder barrel are internally provided with a retraction oil duct which is communicated with the excircle of the primary piston cylinder barrel and the blind hole, and the secondary piston cylinder barrel is provided with a retraction oil hole which is communicated with the excircle of the secondary piston cylinder barrel.
When the device is used, when an oil inlet is formed in the oil port of the rodless cavity, the first-stage piston cylinder barrel and the central piston rod are pushed to move forwards firstly, the second-stage piston cylinder barrel is pushed to move forwards simultaneously until the stroke of the first-stage piston cylinder barrel is finished, and pressure oil continuously pushes the second-stage piston cylinder barrel to move forwards through the oil hole until the stroke of the second-stage piston cylinder barrel is finished; when oil enters the oil port of the rod cavity, the secondary piston cylinder is pushed to be recovered through the retraction oil duct, the blind hole and the retraction oil hole, and then the primary piston cylinder is pushed to be recovered;
the retracting oil duct, the blind hole and the retracting oil hole of the utility model are fixed and convenient to process, do not need to increase the wall thickness, have the advantages of simple oil path and low manufacturing cost, do not need to punch on the cylinder barrel, and can improve the sealing performance of the oil cylinder;
as a further improvement of the utility model, the rear end of the central piston rod is fixedly connected with the primary piston cylinder barrel through a limiting step and a locking nut on the central piston rod; the connection and the installation are convenient;
as a further improvement of the utility model, the inner circle of the piston of the second-stage piston cylinder barrel is provided with two support rings and two combined sealing pieces positioned between the two support rings; the internal sealing performance can be improved;
to sum up, the utility model has the advantages of the oil circuit is simple, low in manufacturing cost to improve the leakproofness of hydro-cylinder.
Drawings
Fig. 1 is a front view of an embodiment of the present invention.
Fig. 2 is a partially enlarged view of fig. 1 at K.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the easy-to-machine two-stage hydraulic cylinder of this embodiment comprises a cylinder body 1, a guide sleeve 2, a first-stage piston cylinder 3, a second-stage piston cylinder 4 and a central piston rod 5, the rear ends of the primary piston cylinder 3 and the secondary piston cylinder 4 are both fixedly provided with a piston and a sealing ring, two ends of the cylinder body 1 are provided with a rodless cavity oil port 6 and a rod cavity oil port 7, a secondary guide sleeve 8 is arranged in the front end of the primary piston cylinder 3, the front end of the secondary piston cylinder 4 is sealed by a fixedly connected top block 9, the front end of a central piston rod 5 is positioned in the secondary piston cylinder 4, a piston of the secondary piston cylinder 4 is sleeved outside the central piston rod 5 in a sliding manner, the rear end of the central piston rod 5 is positioned in the primary piston cylinder 3, the rear end of the central piston rod 5 is fixedly connected with the primary piston cylinder 3 through a limiting step and a locking nut 10 on the central piston rod 5, and the primary piston cylinder 3 is provided with an oil hole 11 for communicating the rear end and an inner cavity; a blind hole 12 is arranged in the front end of the central piston rod 5, a retraction oil duct 13 for communicating the outer circle of the primary piston cylinder with the blind hole 12 is arranged in the rear ends of the central piston rod 5 and the primary piston cylinder 3, and a retraction oil hole 14 for communicating the inner circle and the outer circle of the secondary piston cylinder 4 is arranged; the inner piston circle of the second-stage piston cylinder barrel 4 is provided with two support rings 15 and two combined sealing pieces 16 positioned between the two support rings 15;
when the device is used, when the rodless cavity oil port 6 is filled with oil, the primary piston cylinder 3 and the central piston rod 5 are pushed to move forwards firstly, and the secondary piston cylinder 4 is pushed to move forwards at the same time until the stroke of the primary piston cylinder 3 is finished, and the pressure oil continuously pushes the secondary piston cylinder 4 to move forwards through the oil hole 11 until the stroke of the secondary piston cylinder 4 is finished; when oil enters the rod cavity oil port 7, the secondary piston cylinder 4 is pushed to be recovered through the retraction oil duct 13, the blind hole 12 and the retraction oil hole 14 until the stroke is finished, and then the primary piston cylinder 3 is pushed to be recovered;
the retracting oil duct 13, the blind hole 12 and the retracting oil hole 14 of the oil cylinder are all fixed and convenient to process, do not need to increase the wall thickness, have the advantages of simple oil path and low manufacturing cost, do not need to punch on the cylinder barrel, and can improve the sealing property of the oil cylinder; the two support rings 15 and the two combined sealing elements 16 improve the internal sealing.
Claims (3)
1. An easily-machined two-stage hydraulic cylinder comprises a cylinder body, a guide sleeve, a first-stage piston cylinder barrel, a second-stage piston cylinder barrel and a central piston rod, wherein pistons and sealing rings are fixedly arranged at the rear ends of the first-stage piston cylinder barrel and the second-stage piston cylinder barrel; the front end of the central piston rod is internally provided with a blind hole, the rear ends of the central piston rod and the primary piston cylinder barrel are internally provided with a retraction oil duct which is communicated with the excircle of the primary piston cylinder barrel and the blind hole, and the secondary piston cylinder barrel is provided with a retraction oil hole which is communicated with the excircle of the secondary piston cylinder barrel.
2. An easily workable two-stage hydraulic cylinder as defined in claim 1, wherein the rear end of the center piston rod is fixedly connected to the first stage piston cylinder by a limit step and a lock nut on the center piston rod.
3. An easily workable two stage hydraulic cylinder as defined in claim 1 or 2 wherein the two stage piston bore has two support rings and two composite seals between the two support rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220233981.4U CN216842478U (en) | 2022-01-28 | 2022-01-28 | Two-stage hydraulic cylinder easy to machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220233981.4U CN216842478U (en) | 2022-01-28 | 2022-01-28 | Two-stage hydraulic cylinder easy to machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216842478U true CN216842478U (en) | 2022-06-28 |
Family
ID=82087980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220233981.4U Active CN216842478U (en) | 2022-01-28 | 2022-01-28 | Two-stage hydraulic cylinder easy to machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216842478U (en) |
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2022
- 2022-01-28 CN CN202220233981.4U patent/CN216842478U/en active Active
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