CN217682570U

CN217682570U - Three-stage synchronous telescopic hydraulic oil cylinder

Info

Publication number: CN217682570U
Application number: CN202220661897.2U
Authority: CN
Inventors: 徐光德; 程枫; 甘维芳; 徐丹
Original assignee: Luzhou Zhongda Science & Technology Hydraulic Parts Co ltd
Current assignee: Luzhou Zhongda Science & Technology Hydraulic Parts Co ltd
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2022-10-28
Anticipated expiration: 2032-03-25

Abstract

The utility model discloses a three-stage synchronous telescopic hydraulic oil cylinder, which comprises a cylinder barrel, a cylinder bottom, a primary piston cylinder barrel, a secondary piston cylinder barrel, a central piston rod, a primary guide sleeve, a secondary guide sleeve and a central guide sleeve, wherein pistons are arranged at the rear ends of the primary piston cylinder barrel, the secondary piston cylinder barrel and the central piston rod, and double sealing rings are arranged on the excircle of each piston; the cylinder bottom is internally provided with a cavity extending oil port and a cavity contracting oil port, the rear ends of the piston cylinder barrels of all stages are fixedly connected with the respective cylinder bottom, the center of the oil cylinder is internally provided with three sleeved oil through pipes, the front of each piston is provided with an oil through hole for communicating the inner cavity of the piston with the excircle, and the center oil through pipe is connected with the cavity contracting oil port; the cylinder bottom of each stage of piston cylinder barrel is internally provided with an extending cavity oil way and a one-way valve; the utility model discloses a flexible hydraulic fluid port all sets up on the cylinder bottom, can avoid connecting oil pipe's round trip movement, simplify the installation of pipeline to realize the synchronous flexible of piston rod at all levels, bring the convenience for the use.

Description

Three-stage synchronous telescopic hydraulic oil cylinder

Technical Field

The utility model relates to a tertiary hydraulic cylinder, especially a tertiary synchronous flexible hydraulic cylinder.

Background

An oil port of an extending cavity of a commonly used three-stage telescopic hydraulic oil cylinder is arranged on the outermost cylinder bottom, and an oil port of a contracting cavity is arranged on a central piston rod; when the cylinder barrel is fixed and the piston rod stretches, an oil pipe connected with an oil port of the contraction cavity on the piston rod can move back and forth, so that the installation of a pipeline is not facilitated, synchronous stretching is difficult to realize, and inconvenience is brought to use.

Disclosure of Invention

The utility model aims at the above-mentioned not enough of prior art, provide a tertiary synchronous flexible hydraulic cylinder, its flexible hydraulic fluid port all sets up on the cylinder bottom, can avoid connecting oil pipe's round trip movement, simplify the installation of pipeline to realize the synchronous flexible of piston rod at all levels, bring the convenience for the use.

In order to achieve the purpose, the utility model discloses a three-level synchronous telescopic hydraulic cylinder, including cylinder, cylinder bottom, first-level piston cylinder, second grade piston cylinder and central piston rod, first-level uide bushing, second grade uide bushing and central uide bushing, the rear end of first-level piston cylinder, second grade piston cylinder and central piston rod all is equipped with the piston, and each piston excircle all is equipped with double seal ring; the method is characterized in that: a cavity extending oil port and a cavity contracting oil port are arranged in the cylinder bottom, a first-stage cylinder bottom is fixedly connected in the rear end of a first-stage piston cylinder barrel, a second-stage cylinder bottom is fixedly connected in the rear end of a second-stage piston cylinder barrel, a through oil pipe is fixedly connected with the cylinder bottom, a first-stage through oil pipe is fixedly connected with the first-stage cylinder bottom, a second-stage through oil pipe is fixedly connected with the second-stage cylinder bottom, a blind hole is arranged in the rear end of the central piston rod, the through oil pipe penetrates through the first-stage cylinder bottom, the front end of the through oil pipe is arranged in the first-stage through oil pipe, the first-stage through oil pipe penetrates through the second-stage cylinder bottom, the front end of the through oil pipe is arranged in the blind hole, the central piston rod is provided with an oil passing hole which communicates the blind hole with an excircle in front of the piston, and the through oil pipe is connected with the cavity contracting oil port; the primary cylinder bottom is internally provided with a primary extending cavity oil way communicated with the front end surface and the rear end surface of the primary cylinder bottom, a one-way valve is arranged in the primary extending cavity oil way, and the primary cylinder bottom and the primary piston cylinder barrel are provided with a primary oil passing hole communicated with the inner cavity and the excircle of the primary piston cylinder barrel in front of the piston of the primary cylinder bottom; the second-stage cylinder bottom is internally provided with a second-stage cavity extending oil way communicated with the front end surface and the rear end surface of the second-stage cylinder bottom, the second-stage cavity extending oil way is internally provided with a one-way valve, and the second-stage cylinder bottom and the second-stage piston cylinder barrel are provided with a second-stage oil passing hole communicated with the inner cavity and the excircle of the second-stage cylinder bottom and the piston in front of the piston.

When the hydraulic oil cylinder is used and needs to extend, an oil inlet of an oil port of the extending cavity on the cylinder bottom is used, hydraulic oil pushes the two one-way valves to enter a contracting cavity between the cylinder barrel and the first-stage piston cylinder barrel and a contracting cavity between the first-stage piston cylinder barrel and the second-stage piston cylinder barrel in sequence, and when the two contracting cavities are filled with the hydraulic oil, back cavities of the two one-way valves generate loads to close the two one-way valves; at the moment, the first-stage cylinder bottom of the first-stage piston cylinder barrel and the piston continue to bear oil pressure, the first-stage piston cylinder barrel extends out, the piston moves forwards, and meanwhile, oil in a contraction cavity between the cylinder barrel and the first-stage piston cylinder barrel is extruded into an inner cavity of the first-stage piston cylinder barrel in front of the first-stage cylinder bottom, so that the second-stage piston cylinder barrel extends out, and meanwhile, oil in the contraction cavity between the first-stage piston cylinder barrel and the second-stage piston cylinder barrel is extruded into an inner cavity of the second-stage piston cylinder barrel in front of the second-stage cylinder bottom, so that a central piston rod extends out, and simultaneous action of three-stage piston rods is realized; when the piston is retracted, oil is fed into an oil port of the retraction cavity, hydraulic oil enters the retraction cavity in front of the piston of the central piston rod through the oil through pipe, the primary oil through pipe, the secondary oil through pipe, the blind hole of the central piston rod and the oil through hole, and the central piston rod is retracted; meanwhile, the two check valves are closed under the action of hydraulic oil, oil in the inner cavity of the second-stage piston cylinder barrel and oil in the inner cavity of the first-stage piston cylinder barrel respectively enter the contraction cavities on the outer sides of the two check valves, the second-stage piston cylinder barrel and the first-stage piston cylinder barrel simultaneously retract, and the hydraulic oil in front of the cylinder bottom returns to the oil tank through the oil port of the extension cavity; the utility model can realize the simultaneous movement of the extension of the three-level piston rod, and the extension oil ports are all arranged on the cylinder bottom, thereby avoiding the back and forth movement of the connecting oil pipe, simplifying the installation of the pipeline and bringing convenience for the use;

as a further improvement of the utility model, the cross-sectional area of the contraction cavity between the cylinder barrel and the primary piston cylinder barrel is equal to the cross-sectional area of the inner cavity of the primary piston cylinder barrel in front of the primary cylinder bottom; the cross sectional area of a contraction cavity between the first-stage piston cylinder barrel and the second-stage piston cylinder barrel is equal to the cross sectional area of an inner cavity of the second-stage piston cylinder barrel in front of the bottom of the second-stage cylinder; synchronous extension and retraction of the three-stage piston rod can be realized;

as a further improvement of the utility model, the primary guide sleeve and the secondary guide sleeve are both provided with vent holes, and plugs are arranged in the vent holes; when the piston cylinder is assembled, air in the two shrinkage cavities can be conveniently discharged, vacuum is realized, and the normal telescopic motion of the two-stage piston cylinder is ensured;

as a further improvement of the utility model, a sealing ring is arranged in the first-stage cylinder bottom outside the oil pipe, a sealing ring is arranged in the second-stage cylinder bottom outside the first-stage oil pipe, and a sealing ring is arranged in the piston of the central piston rod outside the second-stage oil pipe; the internal sealing performance of the oil cylinder can be improved;

to sum up, the utility model discloses a flexible hydraulic fluid port all sets up on the cylinder bottom, can avoid connecting oil pipe's round trip movement, simplify the installation of pipeline to realize the synchronous flexible of piston rod at different levels, bring the convenience for the use.

Drawings

Fig. 1 is a front view of the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the three-stage synchronous telescopic hydraulic cylinder of this embodiment includes a cylinder barrel 1, a cylinder bottom 2, a first-stage piston cylinder barrel 3, a second-stage piston cylinder barrel 4, a central piston rod 5, a first-stage guide sleeve 6, a second-stage guide sleeve 7, and a central guide sleeve 8, wherein the first-stage guide sleeve 5 and the second-stage guide sleeve 6 are respectively provided with a

vent hole

15 or 16, and a plug 17 or 18 is respectively provided in each of the two vent holes through a thread; the rear ends of the first-stage piston cylinder 3, the second-stage piston cylinder 4 and the central piston rod 5 are respectively provided with a piston 9, a piston 10 or a piston 11, and the excircle of each piston is provided with a double sealing ring 38, a double sealing ring 39; a cavity extending oil port 12 and a cavity contracting oil port 13 are arranged in the cylinder bottom 2, a first-stage cylinder bottom 19 is fixedly connected in the rear end of the first-stage piston cylinder barrel 3 through threads, a second-stage cylinder bottom 20 is fixedly connected in the rear end of the second-stage piston cylinder barrel 4 through threads, an oil through pipe 21 is fixedly connected in the cylinder bottom 2 in a welding manner, a first-stage oil through pipe 22 is fixedly connected in the first-stage cylinder bottom 19, a second-stage oil through pipe 23 is fixedly connected in the second-stage cylinder bottom 20, a blind hole 24 is arranged in the rear end of the central piston rod 5, the oil through pipe 21 penetrates through the first-stage cylinder bottom 10, the front end of the oil through pipe is arranged in the first-stage oil through pipe 22, a sealing ring 25 is arranged in the first-stage cylinder bottom 19 outside the oil through pipe 21, the first-stage oil through pipe 22 penetrates through the second-stage cylinder bottom 20, the front end of the first-stage oil through pipe 23 is arranged in the second-stage oil through pipe 23, a sealing ring 26 is arranged in the second-stage cylinder bottom 20 outside the first-stage oil through pipe 22, the second-stage oil through pipe 23 penetrates through piston 11, the blind hole is arranged in the blind hole 24, a sealing ring 27 is arranged in the piston 11 outside the second-stage oil through pipe 23, the central piston rod is provided with an excircle of the oil through pipe 24, and is connected with the through hole 21, and the central piston rod 11, and the oil through hole 13; a primary cavity extending oil way 29 communicated with the front end face and the rear end face of the primary cylinder bottom 19 is arranged in the primary cylinder bottom 19, a one-way valve 30 is arranged in the primary cavity extending oil way 29, and a primary oil passing hole 31 communicated with the inner cavity and the excircle of the primary cylinder bottom 19 and the primary piston cylinder 3 is arranged in front of the piston 9; a secondary cavity extending oil way 32 communicated with the front end face and the rear end face of the secondary cylinder bottom 20 is arranged in the secondary cylinder bottom, a one-way valve 33 is arranged in the secondary cavity extending oil way 32, and a secondary oil passing hole 34 communicated with the inner cavity and the excircle of the secondary cylinder bottom 20 and the secondary piston cylinder barrel 4 is arranged in front of the piston 10; the cross sectional area of the contraction cavity 35 between the cylinder barrel 1 and the first-stage piston cylinder barrel 3 is equal to the cross sectional area of the inner cavity of the first-stage piston cylinder barrel 3 in front of the first-stage cylinder bottom 19; the cross-sectional area of the contraction cavity 36 between the first-stage piston cylinder barrel 3 and the second-stage piston cylinder barrel 4 is equal to the cross-sectional area of the inner cavity of the second-stage piston cylinder barrel 4 in front of the second-stage cylinder bottom 20.

When the hydraulic oil sealing device is used and needs to extend, an oil inlet is formed in an extending cavity oil port 12 in the cylinder bottom 2, hydraulic oil enters a first-stage cylinder bottom 19 and a cavity behind a piston 9, two

check valves

30 and 33 are pushed open in sequence and enter a contracting cavity 35 between a cylinder barrel 1 and a first-stage piston cylinder barrel 3 and a contracting cavity 36 between the first-stage piston cylinder barrel 3 and a second-stage piston cylinder barrel 4 through a first-stage oil passing hole 31 and a second-stage oil passing hole 34, when the two contracting cavities are filled with the hydraulic oil, load is generated in back cavities of the two

check valves

30 and 33, the pressure bearing area of the back cavities of the two valve cores is larger than the area of an oil sealing surface, the two

check valves

30 and 33 are closed, and the oil is locked in the two contracting

cavities

35 and 36; at the moment, the first-stage cylinder bottom 19 of the first-stage piston cylinder barrel 3 and the piston 9 continue to bear oil pressure, the first-stage piston cylinder barrel 3 extends, the piston 9 moves forwards, and meanwhile, oil in a contraction cavity 35 between the cylinder barrel 1 and the first-stage piston cylinder barrel 3 is extruded into an inner cavity of the first-stage piston cylinder barrel 3 in front of the first-stage cylinder bottom 19 through the first-stage oil passing hole 31, so that the second-stage piston cylinder barrel 4 extends, and meanwhile, oil in a contraction cavity 36 between the first-stage piston cylinder barrel 3 and the second-stage piston cylinder barrel 4 is extruded into an inner cavity of the second-stage piston cylinder barrel 4 in front of the second-stage cylinder bottom 20 through the second-stage oil passing hole 34, so that the central piston rod 5 extends out, and simultaneous extension of a third-stage piston rod is realized, and because the cross-sectional area of the contraction cavity 35 between the cylinder barrel 1 and the first-stage piston cylinder barrel 3 is equal to the cross-sectional area of the inner cavity of the first-stage piston cylinder barrel 3 in front of the first-stage cylinder bottom 19; the cross section area of a contraction cavity 36 between the first-stage piston cylinder barrel 3 and the second-stage piston cylinder barrel 4 is equal to the cross section area of an inner cavity of the second-stage piston cylinder barrel 4 in front of the second-stage cylinder bottom 20, and the extension distances of the third-stage piston rods are also equal, so that synchronous extension is realized; hydraulic oil in the second-stage piston cylinder 4 in front of the piston 11 returns to the oil tank through the oil passing hole 28, the blind hole 24, the second-stage oil through pipe 23, the first-stage oil through pipe 22, the oil through pipe 21 and the cavity contracting oil port 13; when retracting, the oil inlet 13 of the cavity is arranged, hydraulic oil enters the cavity in front of the piston 11 of the central piston rod 5 through the oil pipe 21, the first-stage oil pipe 22, the second-stage oil pipe 23, the blind hole 24 and the oil passing hole 28, and the central piston rod 5 retracts; meanwhile, the two

check valves

30 and 33 are closed under the action of hydraulic oil, oil in the inner cavity of the secondary piston cylinder barrel 4 and the inner cavity of the primary piston cylinder barrel 3 respectively enter the

contraction cavities

36 and 35 on the outer sides of the two check valves, the secondary piston cylinder barrel 4 and the primary piston cylinder barrel 3 synchronously retract at the same time, and the hydraulic oil in front of the cylinder bottom 2 returns to the oil tank through the extension cavity oil port 12; the utility model can realize the synchronous action of the expansion of the three-level piston rod, and the expansion oil ports are all arranged on the cylinder bottom 2, thereby avoiding the back-and-forth movement of the connecting oil pipe, simplifying the installation of the pipeline and bringing convenience to the use; during assembly, air in the two

shrinkage cavities

35 and 36 can be conveniently exhausted through the

vent holes

15 and 16, vacuum is realized, and the normal telescopic motion of the two-stage

piston cylinder barrels

3 and 4 is ensured; the

sealing rings

25, 26 and 27 can improve the internal sealing performance of the oil cylinder;

the present invention is not limited to the above embodiments, and the "fixed connection" should be understood in a broad sense, and may be, for example, a fixed welding type connection.

Claims

1. A three-stage synchronous telescopic hydraulic oil cylinder comprises a cylinder barrel, a cylinder bottom, a primary piston cylinder barrel, a secondary piston cylinder barrel, a central piston rod, a primary guide sleeve, a secondary guide sleeve and a central guide sleeve, wherein pistons are arranged at the rear ends of the primary piston cylinder barrel, the secondary piston cylinder barrel and the central piston rod, and double sealing rings are arranged on the excircle of each piston; the method is characterized in that: the cylinder bottom is internally provided with a cavity extending oil port and a cavity retracting oil port, the rear end of the first-stage piston cylinder barrel is fixedly connected with a first-stage cylinder bottom, the rear end of the second-stage piston cylinder barrel is fixedly connected with a second-stage cylinder bottom, the cylinder bottom is fixedly connected with a through oil pipe, the first-stage cylinder bottom is fixedly connected with a first-stage through oil pipe, the second-stage cylinder bottom is fixedly connected with a second-stage through oil pipe, the rear end of the central piston rod is internally provided with a blind hole, the through oil pipe penetrates through the first-stage cylinder bottom, the front end of the through oil pipe is arranged in the first-stage through oil pipe, the first-stage through oil pipe penetrates through the second-stage cylinder bottom, the front end of the through oil pipe is arranged in the blind hole, the central piston rod is provided with an oil passing hole which is communicated with an excircle in front of the piston, and the through oil pipe is connected with the cavity retracting oil port; the primary cylinder bottom is internally provided with a primary extending cavity oil way communicated with the front end surface and the rear end surface of the primary cylinder bottom, a one-way valve is arranged in the primary extending cavity oil way, and the primary cylinder bottom and the primary piston cylinder barrel are provided with a primary oil passing hole communicated with the inner cavity and the excircle of the primary piston cylinder barrel in front of the piston of the primary cylinder bottom; the second-stage cylinder bottom is internally provided with a second-stage cavity extending oil way communicated with the front end surface and the rear end surface of the second-stage cylinder bottom, the second-stage cavity extending oil way is internally provided with a one-way valve, and the second-stage cylinder bottom and the second-stage piston cylinder barrel are provided with a second-stage oil passing hole communicated with the inner cavity and the excircle of the second-stage cylinder bottom and the piston in front of the piston.

2. The three-stage synchronous telescopic hydraulic oil cylinder as claimed in claim 1, wherein: the cross sectional area of a contraction cavity between the cylinder barrel and the primary piston cylinder barrel is equal to the cross sectional area of an inner cavity of the primary piston cylinder barrel in front of the primary cylinder bottom; the cross-sectional area of the contraction cavity between the first-stage piston cylinder barrel and the second-stage piston cylinder barrel is equal to the cross-sectional area of the inner cavity of the second-stage piston cylinder barrel in front of the second-stage cylinder bottom.

3. The three-stage synchronous telescopic hydraulic oil cylinder as claimed in claim 1 or 2, characterized in that: the primary guide sleeve and the secondary guide sleeve are provided with vent holes, and plugs are arranged in the vent holes.

4. The three-stage synchronous telescopic hydraulic oil cylinder as claimed in claim 3, characterized in that: a sealing ring is arranged in the first-stage cylinder bottom outside the oil pipe, a sealing ring is arranged in the second-stage cylinder bottom outside the first-stage oil pipe, and a sealing ring is arranged in the piston of the central piston rod outside the second-stage oil pipe.