CN216554728U - Two-stage telescopic oil cylinder - Google Patents
Two-stage telescopic oil cylinder Download PDFInfo
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- CN216554728U CN216554728U CN202123389328.1U CN202123389328U CN216554728U CN 216554728 U CN216554728 U CN 216554728U CN 202123389328 U CN202123389328 U CN 202123389328U CN 216554728 U CN216554728 U CN 216554728U
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Abstract
The utility model provides a two-stage telescopic oil cylinder which comprises a cylinder body, wherein one end of the cylinder body is fixedly provided with a cylinder bottom, the other end of the cylinder body is fixedly provided with a first guide sleeve, a sliding first-stage piston rod and a sliding second-stage piston rod are arranged in the cylinder body, a piston of the first-stage piston rod is tightly abutted against the inner wall of the cylinder body in a sealing manner, a rod body of the first-stage piston rod penetrates through a rod sealing inner hole of the first guide sleeve, a second guide sleeve is fixedly arranged at the end part of the first-stage piston rod, a piston of the second-stage piston rod is tightly abutted against the inner wall of the first-stage piston rod in a sealing manner, and a rod body of the second-stage piston rod penetrates through a rod sealing inner hole of the second guide sleeve; a buffer sleeve is arranged in the cylinder bottom, and the end part of the secondary piston rod is abutted against the buffer sleeve to slide. The telescopic tail ends of the primary piston rod and the secondary piston rod have obvious buffering, the primary piston rod and the secondary piston rod are enabled to be started and stretched quickly, play and noise are avoided, and normal use of the secondary telescopic oil cylinder is guaranteed.
Description
Technical Field
The utility model relates to the technical field of secondary oil cylinders, in particular to a secondary telescopic oil cylinder.
Background
The conventional secondary telescopic oil cylinder is only responsible for the secondary extension and retraction of the oil cylinder under rated working pressure, the secondary telescopic oil cylinder protected by the application requires the completion of the secondary telescopic oil cylinder with obvious front and back buffering within the specified time, and moreover, the sound of the piston impacting the cylinder bottom cannot occur. The cylinder play is not allowed to occur during the extending and retracting processes. In order to overcome the difficulties, a two-stage telescopic oil cylinder with front and back buffering and sequential extension and retraction is specially designed.
Chinese patent 'CN 203023169U' relates to synchronous two-stage telescopic oil cylinder, when driving multi-stage piston rods to extend, the multi-stage piston rods or the cylinder bottom can be collided, the piston rods can move, and the collision can generate noise. The piston rod is started quickly, so that the normal use of the oil cylinder is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a two-stage telescopic oil cylinder, which solves the problems in the background technology.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: the cylinder comprises a cylinder body, wherein a cylinder bottom is fixedly arranged at one end of the cylinder body, a first guide sleeve is fixedly arranged at the other end of the cylinder body, a sliding first-stage piston rod and a sliding second-stage piston rod are arranged in the cylinder body, a piston of the first-stage piston rod is in sealing abutment with the inner wall of the cylinder body, a rod body of the first-stage piston rod penetrates through a rod sealing inner hole of the first guide sleeve, a second guide sleeve is fixedly arranged at the end part of the first-stage piston rod, a piston of the second-stage piston rod is in sealing abutment with the inner wall of the first-stage piston rod, and a rod body of the second-stage piston rod penetrates through a rod sealing inner hole of the second guide sleeve;
a buffer sleeve is arranged in the cylinder bottom, and the end part of the secondary piston rod is abutted against and slides in the buffer sleeve.
In the preferred scheme, a primary rodless cavity is formed between the end part of a primary piston rod and the cylinder body as well as the cylinder bottom, and a secondary rodless cavity is formed between the end part of a secondary piston rod and the inner wall of the primary piston rod;
the outer side of the cylinder bottom is provided with a rodless cavity oil inlet which is communicated with the primary rodless cavity and the secondary rodless cavity.
In the preferred scheme, a primary rod cavity is formed among the primary piston rod, the cylinder body and the first guide sleeve, and a secondary rod cavity is formed among the secondary piston rod, the inner wall of the primary piston rod and the second guide sleeve;
the outer side of the cylinder body is provided with a rod cavity oil inlet which is communicated with the first-stage rod cavity and the second-stage rod cavity.
In the preferred scheme, a plurality of inner hole oil ways are arranged on the periphery inside the primary piston rod, and the primary rod cavity is communicated with the secondary rod cavity through the inner hole oil ways;
the opening of the end part of the inner hole oil path is fixedly provided with a sealing plug which is used for isolating the rodless cavity and the rod cavity.
In the preferred scheme, a plurality of oilholes are arranged on the periphery of the outer side of the first guide sleeve, the oilholes are located at the oil inlet of the rod cavity, and a plurality of third grooves are arranged on the periphery of the end face of the first guide sleeve.
In the preferred scheme, the clearance between the primary piston rod and the first guide sleeve is the same as the clearance between the secondary piston rod and the second guide sleeve, so that the secondary piston rod retracts before the primary piston rod.
In the preferred scheme, one end hole terminal surface periphery of one-level piston rod is equipped with a plurality of second recesses to cushion when retracting the second grade piston rod.
In the preferred scheme, a plurality of first grooves are formed in the peripheries of two end faces of the buffer sleeve, one end of the buffer sleeve abuts against the inside of the cylinder bottom, and the other end of the buffer sleeve is fixed in the cylinder bottom through the check ring.
In a preferable scheme, the first groove forms an oil passing gap between the buffer sleeve and the cylinder bottom, so that the primary piston rod is buffered, the extension and retraction speed is guaranteed, and further buffering is formed when the end part of the secondary piston rod penetrates through the buffer sleeve.
In the preferred scheme, the third groove forms an oil passing gap between the primary piston rod and the first guide sleeve, so that the primary piston rod and the secondary piston rod can be quickly started.
The utility model provides a two-stage telescopic oil cylinder which has the beneficial effects that:
1. the clearance between the primary piston rod and the first guide sleeve is the same as the clearance between the secondary piston rod and the second guide sleeve, so that the secondary piston rod retracts before the primary piston rod, and the smooth retraction of the piston rod is ensured;
2. the third groove on the end face of the second guide sleeve can ensure that the primary piston rod can be started quickly, and the primary piston rod is prevented from moving;
3. the second groove on the end face of the inner hole of the primary piston rod can prevent the secondary piston rod from impacting the primary piston rod to generate noise;
4. the plurality of oil holes on the inner periphery of the primary piston rod can ensure that oil in the primary rod cavity can quickly enter the secondary rod cavity;
5. the first grooves at the two ends of the buffer sleeve can ensure that the cylinder bottom is not knocked when the primary piston rod retracts, no noise is generated, and meanwhile, the secondary piston rod is further buffered when penetrating through the buffer sleeve.
Drawings
The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a front cross-sectional view of the cylinder retraction of the present invention;
FIG. 2 is an extended front cross-sectional view of the cylinder of the present invention;
FIG. 3 is a front cross-sectional view of the cylinder block connection of the present invention;
FIG. 4 is a multi-view of the primary piston rod of the present invention;
FIG. 5 is a multiple view of a first guide sleeve of the present invention;
FIG. 6 is a multi-view of the cushion collar of the present invention;
in the figure: a cylinder bottom 1; a cylinder body 2; a primary piston rod 3; an inner bore oil passage 301; a sealing plug 302; a second groove 303; a secondary piston rod 4; a first guide sleeve 5; an oil hole 501; a third groove 502; a second guide sleeve 6; a buffer sleeve 7; a first groove 701; a retainer ring 8; a rod cavity oil inlet 9; a rodless cavity oil inlet 10; a primary rod cavity 11; a secondary rod cavity 12; a primary rodless chamber 13; a secondary rodless cavity 14.
Detailed Description
Example 1
As shown in fig. 1 to 6, in a two-stage telescopic cylinder, when hydraulic oil with proper working pressure is added to feed oil from an oil inlet 10 of a rodless cavity of a cylinder bottom 1, a primary piston rod 3 extends to the bottom first, and then a secondary piston rod 4 extends sequentially to complete the extending process; when hydraulic oil with proper working pressure is added to lead oil from an oil inlet 9 of a rod cavity on the cylinder body 2, the secondary piston rod 4 is ensured to retract firstly due to the allocation of the designed clearance, and then the primary piston rod 3 and the secondary piston rod 4 retract to the cylinder bottom 1 together.
The clearance between the primary piston rod 3 and the first guide sleeve 5 is the same as the clearance between the secondary piston rod 4 and the second guide sleeve 6, so that the secondary piston rod retracts before the primary piston rod, and the smooth retraction of the piston rod is ensured; if the clearance design of the piston rod and the guide sleeve is not proper, the primary piston rod 3 firstly returns to the cylinder bottom 1, and at the time, the secondary piston rod 4 returns to the bottom end of the primary piston rod 3, so that the primary piston rod 3 moves. Because the secondary piston rod 4 will cause a momentary high pressure in the primary piston rod 3 and the cylinder bottom 1 when it is retracted.
As shown in fig. 5, in order to ensure that the oil entering from the oil inlet 9 of the rod cavity of the cylinder 2 can quickly reach the first-stage rod cavity 11 and the second-stage rod cavity 12 in the first time, four third grooves 502 are formed in the end surface of the first guide sleeve 5, so that the first-stage piston rod 3 and the second-stage piston rod 4 can be quickly started, and if the third grooves 502 are not formed, the first-stage piston rod 3 can move or cannot move or can be started slowly when retracting.
As shown in fig. 4, in order to effectively avoid the impact and noise generated by the secondary piston rod 4 and the primary piston rod 3, four second grooves 303 are formed in the end surface of the inner hole of the primary piston rod 3, and the second grooves 303 can play a role in buffering and can drain oil quickly, so that the secondary piston rod 4 can reach the bottom end of the primary piston rod 3 quickly. Meanwhile, a plurality of inner hole oil ways 301 are uniformly distributed on the inner wall of the first-stage piston rod 3, and the uniformly distributed inner hole oil ways 301 can effectively ensure that oil in the first-stage rod cavity 11 can quickly enter the second-stage rod cavity 12.
As shown in fig. 6, when the primary piston rod 3 retracts, the cylinder bottom 1 is knocked to make a sound, four first grooves 701 are formed in two end faces of the buffer sleeve 7, so that the buffer effect can be achieved when the primary piston rod 3 retracts, meanwhile, the buffer effect can be achieved when the secondary piston rod 4 retracts to penetrate through the buffer sleeve 7, and the buffer effect can be achieved on the primary piston rod 3 and the secondary piston rod 4 through the buffer sleeve 7. When the piston rod stretches out and draws back, fluid can pass through from the oily clearance of crossing that first recess 701 formed, guarantees the flexible speed of piston rod.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the utility model.
Claims (10)
1. A two-stage telescopic oil cylinder is characterized in that: the cylinder comprises a cylinder body (2), one end of the cylinder body (2) is fixedly provided with a cylinder bottom (1), the other end of the cylinder body is fixedly provided with a first guide sleeve (5), a sliding first-stage piston rod (3) and a sliding second-stage piston rod (4) are arranged in the cylinder body (2), a piston of the first-stage piston rod (3) is abutted against the inner wall of the cylinder body (2) in a sealing manner, a rod body of the first-stage piston rod (3) penetrates through a rod sealing inner hole of the first guide sleeve (5), the end part of the first-stage piston rod (3) is fixedly provided with a second guide sleeve (6), a piston of the second-stage piston rod (4) is abutted against the inner wall of the first-stage piston rod (3) in a sealing manner, and a rod body of the second-stage piston rod (4) penetrates through a rod sealing inner hole of the second guide sleeve (6);
a buffer sleeve (7) is arranged in the cylinder bottom (1), and the end part of the secondary piston rod (4) is propped against the buffer sleeve (7) to slide.
2. The two-stage telescopic cylinder as claimed in claim 1, wherein: a primary rodless cavity (13) is formed between the end part of the primary piston rod (3) and the cylinder body (2) and the cylinder bottom (1), and a secondary rodless cavity (14) is formed between the end part of the secondary piston rod (4) and the inner wall of the primary piston rod (3);
a rodless cavity oil inlet (10) is formed in the outer side of the cylinder bottom (1), and the rodless cavity oil inlet (10) is communicated with the primary rodless cavity (13) and the secondary rodless cavity (14).
3. The two-stage telescopic cylinder as claimed in claim 1, wherein: a primary rod cavity (11) is formed between the primary piston rod (3) and the cylinder body (2) and between the primary piston rod and the first guide sleeve (5), and a secondary rod cavity (12) is formed between the secondary piston rod (4) and the inner wall of the primary piston rod (3) and between the secondary piston rod and the second guide sleeve (6);
a rod cavity oil inlet (9) is arranged on the outer side of the cylinder body (2), and the rod cavity oil inlet (9) is communicated with a first-stage rod cavity (11) and a second-stage rod cavity (12).
4. The two-stage telescopic cylinder as claimed in claim 3, wherein: a plurality of inner hole oil ways (301) are arranged on the inner periphery of the primary piston rod (3), and the primary rod cavity (11) is communicated with the secondary rod cavity (12) through the inner hole oil ways (301);
a sealing plug (302) is fixedly arranged at an opening at the end part of the inner hole oil path (301), and the sealing plug (302) is used for isolating the rodless cavity from the rod cavity.
5. The two-stage telescopic cylinder as claimed in claim 1, wherein: a plurality of oil holes (501) are formed in the periphery of the outer side of the first guide sleeve (5), the oil holes (501) are located at the oil inlet (9) of the rod cavity, and a plurality of third grooves (502) are formed in the periphery of the end face of the first guide sleeve (5).
6. The two-stage telescopic cylinder as claimed in claim 1, wherein: the clearance between the primary piston rod (3) and the first guide sleeve (5) is the same as the clearance between the secondary piston rod (4) and the second guide sleeve (6), so that the secondary piston rod (4) retracts before the primary piston rod (3).
7. The two-stage telescopic cylinder as claimed in claim 1, wherein: a plurality of second grooves (303) are formed in the periphery of the end face of an inner hole in one end of the primary piston rod (3), so that the secondary piston rod (4) is buffered when being retracted.
8. The two-stage telescopic cylinder as claimed in claim 1, wherein: a plurality of first grooves (701) are formed in the peripheries of two end faces of the buffer sleeve (7), one end of the buffer sleeve (7) is abutted against the cylinder bottom (1), and the other end of the buffer sleeve (7) is fixed in the cylinder bottom (1) through a check ring (8).
9. The two-stage telescopic cylinder as claimed in claim 8, wherein: the first groove (701) forms an oil passing gap between the buffer sleeve (7) and the cylinder bottom (1), so that the primary piston rod (3) is buffered, the extending and retracting speed is guaranteed, and further buffering is formed when the end part of the secondary piston rod (4) penetrates through the buffer sleeve (7).
10. The two-stage telescopic cylinder as claimed in claim 5, wherein: the third groove (502) forms an oil passing gap between the primary piston rod (3) and the first guide sleeve (5) so that the primary piston rod (3) and the secondary piston rod (4) can be quickly started.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123389328.1U CN216554728U (en) | 2021-12-30 | 2021-12-30 | Two-stage telescopic oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123389328.1U CN216554728U (en) | 2021-12-30 | 2021-12-30 | Two-stage telescopic oil cylinder |
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| Publication Number | Publication Date |
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| CN216554728U true CN216554728U (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123389328.1U Active CN216554728U (en) | 2021-12-30 | 2021-12-30 | Two-stage telescopic oil cylinder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370441A (en) * | 2021-12-30 | 2022-04-19 | 中船重工中南装备有限责任公司 | Two-stage telescopic oil cylinder with buffering function |
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2021
- 2021-12-30 CN CN202123389328.1U patent/CN216554728U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370441A (en) * | 2021-12-30 | 2022-04-19 | 中船重工中南装备有限责任公司 | Two-stage telescopic oil cylinder with buffering function |
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