CN112797043B - Sequential telescopic cylinder, multi-cylinder sequential telescopic mechanism and crane - Google Patents
Sequential telescopic cylinder, multi-cylinder sequential telescopic mechanism and crane Download PDFInfo
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- CN112797043B CN112797043B CN202110136096.4A CN202110136096A CN112797043B CN 112797043 B CN112797043 B CN 112797043B CN 202110136096 A CN202110136096 A CN 202110136096A CN 112797043 B CN112797043 B CN 112797043B
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- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims 2
- 230000008602 contraction Effects 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
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- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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Abstract
The invention discloses a sequential telescopic cylinder, a multi-cylinder sequential telescopic mechanism and a crane, which comprise a cylinder barrel, wherein the bottom end in the cylinder barrel is provided with a piston, the top end in the cylinder barrel is provided with a guide sleeve, the piston is connected with a cylinder rod, the top end of the cylinder rod is connected with a rod head, and the guide sleeve is sleeved on the periphery side of the cylinder rod; a first core tube with an oil port is arranged in the cylinder barrel; one side of the cylinder barrel is provided with three oil ports, one oil port is communicated with a rod cavity of the cylinder barrel, the other oil port is communicated with a rodless cavity of the cylinder barrel, and the other oil port is communicated with an oil port on the guide sleeve; the cylinder rod is internally provided with a second core pipe and a third core pipe which are communicated with two oil ducts on the rod head, the second core pipe is sleeved on the outer periphery side of the first core pipe, and the third core pipe is communicated with a rod cavity of the cylinder barrel through an oil port on the cylinder rod; an oil port is arranged on the cylinder rod and is communicated with a rod cavity and a cylinder rod cavity of the cylinder barrel; the rod head is provided with an oil duct communicated with the inner cavity of the cylinder rod and a stroke valve. The problems of large pressure loss, rapid heating and unstable sequence caused by sequential expansion and contraction through the sequence valve are solved.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a sequential telescopic cylinder, a multi-cylinder sequential telescopic mechanism and a crane.
Background
Currently, the boom telescoping modes of a crane are mainly two types of synchronous telescoping (straight boom crane) or sequential telescoping (folding boom crane) which can only be sequentially stretched and not sequentially recovered. However, with the development of the crane industry, the number of boom sections is increased, the on-load expansion and contraction requirements are continuously improved, and the two expansion and contraction modes can not meet the market demands. Along with market development and technical progress, complete sequential expansion and contraction gradually becomes a main stream mode of the multi-section arm crane, at present, domestic sequential expansion and contraction systems are realized by means of sequential valves, but along with the increase of the number of arm sections, sequential expansion and contraction are more and more difficult by means of the sequential valves, and the system pressure is too high due to the fact that the number of the sequential valves is large, so that the sequential performance is quite unreliable. In addition, the debugging time by using the sequence valve is long and the efficiency is low.
Disclosure of Invention
The invention aims to provide a sequential telescopic oil cylinder, a multi-cylinder sequential telescopic mechanism and a crane, which realize reliable sequential telescopic operation by controlling the on-off of an oil port of the oil cylinder, and solve the problems of large pressure loss, rapid heating and unstable sequential performance caused by the sequential telescopic operation realized by a sequential valve at the present stage.
The invention adopts the following technical scheme for realizing the purposes of the invention:
the invention provides a sequential telescopic oil cylinder, which comprises a cylinder barrel, wherein a piston is arranged at the bottom end in the cylinder barrel, a guide sleeve with an oil port is arranged at the top end in the cylinder barrel, a cylinder rod extending out of the cylinder barrel is connected to the piston, a rod head is connected to the top end of the cylinder rod, and the guide sleeve is movably sleeved on the outer peripheral side of the cylinder rod;
the cylinder barrel is internally and fixedly provided with a first core pipe, and an oil port is further formed in the first core pipe, so that when the oil cylinder is fully extended, the rodless cavity of the cylinder barrel is communicated with the inner cavity of the first core pipe;
one side of the cylinder barrel is provided with three oil ports, one oil port is communicated with a rod cavity of the cylinder barrel, one oil port is communicated with a rodless cavity of the cylinder barrel, and the other oil port is communicated with an oil port on the guide sleeve;
a second core pipe and a third core pipe are arranged in the cylinder rod and are respectively communicated with the two oil ducts on the rod head in a one-to-one correspondence manner, wherein the second core pipe is movably sleeved on the outer peripheral side of the first core pipe, and the third core pipe is communicated with the rod cavity of the cylinder barrel through an oil port on the cylinder rod;
an oil port is further formed in the cylinder rod and is communicated with a rod cavity and an inner cavity of the cylinder rod;
the rod head is also provided with an oil passage communicated with the inner cavity of the cylinder rod, and the rod head is provided with a travel valve for controlling the on-off of the oil passage and the oil passage corresponding to the third core pipe on the rod head.
Further, the first core tube is provided with a control valve for controlling the flow direction of oil inside and outside the tube.
Further, the control valve is a one-way valve.
Further, a runner is arranged on the outer side of the cylinder barrel, and the runner is communicated with an oil port of the cylinder barrel with a rod cavity and an oil port of the guide sleeve.
The invention provides a multi-cylinder sequential telescopic mechanism which comprises a first sequential telescopic cylinder, a second sequential telescopic cylinder and a common cylinder, wherein the first sequential telescopic cylinder is connected with the common cylinder;
the rod head of the first sequential telescopic oil cylinder is correspondingly communicated with the runner of the second core tube and is communicated with the oil port of the second sequential telescopic oil cylinder, which is communicated with the rodless cavity of the cylinder barrel;
the rod head of the first sequential telescopic oil cylinder is correspondingly communicated with the runner of the third core tube, and is communicated with two oil ports on one side of a cylinder barrel of the second sequential telescopic oil cylinder, wherein one oil port is communicated with a rod cavity of the cylinder barrel, and the other oil port is communicated with an oil port on the guide sleeve;
the rod head of the second sequential telescopic oil cylinder is connected with a touch piece for controlling the on-off of a travel valve of the first sequential telescopic oil cylinder;
the rod head of the first sequential telescopic cylinder is connected with the cylinder barrel of the second sequential telescopic cylinder through a connecting piece;
the rod head of the second sequential telescopic oil cylinder is correspondingly communicated with the flow passage of the second core tube and is communicated with the oil port of the rodless cavity of the common oil cylinder, which is communicated with the cylinder barrel;
the rod head of the second sequential telescopic oil cylinder is correspondingly communicated with the runner of the third core tube and is communicated with the oil port of the rod cavity of the common oil cylinder;
the rod head of the common oil cylinder is connected with a touch piece for controlling the on-off of a stroke valve of the second sequential telescopic oil cylinder;
the rod head of the second sequential telescopic oil cylinder is connected with the cylinder barrel of the common oil cylinder through a connecting piece.
Further, the common oil cylinder comprises a cylinder barrel, a piston is arranged at the bottom end in the cylinder barrel, a guide sleeve is arranged at the top end in the cylinder barrel, a cylinder rod extending out of the cylinder barrel is connected to the piston, a rod head is connected to the top end of the cylinder rod, and the guide sleeve is movably sleeved on the outer peripheral side of the cylinder rod;
one side of the cylinder barrel is provided with two oil ports, one oil port is communicated with a rod cavity of the cylinder barrel, and the other oil port is communicated with a rodless cavity of the cylinder barrel.
The invention provides a crane, which comprises the multi-cylinder sequential telescopic mechanism.
The invention has the beneficial effects that:
the invention provides a sequential telescopic oil cylinder, which is characterized in that an oil port on a cylinder barrel core pipe is used for controlling the sequential extension of the oil cylinder, and the sequential recovery of the cylinder barrel oil port, a cylinder rod core pipe and a travel valve is used for controlling the oil cylinder, so that the processing difficulty is low and the reliability is high;
the invention also provides a multi-cylinder sequential telescopic mechanism and a crane, which realize sequential telescopic of multiple cylinders by controlling the on-off of the oil way of the oil cylinder, have high reliability of sequential telescopic, do not need sequential valves, have small pressure loss, reduce the heating of the system, and simultaneously have more convenient debugging and improved debugging efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a sequential telescopic cylinder according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a fully retracted state of a three-cylinder sequential telescoping mechanism according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a full extension state of a three-cylinder sequential telescopic mechanism according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, the invention provides a sequential telescopic cylinder, which comprises a cylinder barrel 1, a cylinder rod 2, a guide sleeve 3, a rod head 4, a stroke valve 5, a second core pipe 6, a third core pipe 7, a piston 8 and a first core pipe 9. The first core tube 9 is fixed on the cylinder barrel 1, a one-way valve is arranged on the first core tube 9, oil in the first core tube 9 is allowed to flow unidirectionally to the outside of the tube through the oil port n1, and the oil port g1 is also arranged on the first core tube 9. The cylinder barrel 1 is provided with 3 oil ports, namely a1, b1 and c1, wherein the oil port a1 is communicated with the rodless cavity, b1 is communicated with the rod cavity, and c1 is communicated with an oil port d1 on the guide sleeve 3. The cylinder rod 2 is internally provided with a second core pipe 6 and a third core pipe 7, the cylinder rod is provided with an oil port e1 and an oil port f1, the oil port e1 is communicated with a rod cavity of the oil cylinder and an inner cavity of the cylinder rod 2, and the oil port f1 is communicated with the rod cavity and the inner cavity of the third core pipe 7. The second core tube 6 is sleeved outside the first core tube 9 and is communicated with an oil port m1 on the club head 4. The rod head 4 is also provided with an oil port h1 which is communicated with the inner cavity of the cylinder rod 2, and the oil port k1 is communicated with the inner cavity of the third core tube 7. The rod head 4 is provided with a stroke valve 5, the stroke valve 5 is used for controlling the on-off of the oil port h1 and the oil port k1, when the stroke valve 5 is in a free state, the oil port h1 and the oil port k1 are disconnected, and when the stroke valve is pressed, the oil port h1 and the oil port k1 are communicated. When the oil cylinder starts to move from the fully contracted state, oil enters the rodless cavity from the port A through the port a1, the piston 8 is pushed to move, and the oil in the rod cavity flows out from the port B of the flow passage through the port B1. When the oil port B1 is blocked by the piston 8, at this time, the oil port f1 on the cylinder rod 2 is communicated with the oil port d1 on the guide sleeve 3, the oil with a rod cavity sequentially passes through the oil port e1 on the cylinder rod 2, the inner cavity of the cylinder rod 2, the h1 of the oil port on the rod head 4, the stroke valve 5, the k1 of the oil port on the rod head 4, the third core tube 7, the oil port f1 on the cylinder rod 2, the oil port d1 on the guide sleeve 3 and the oil port c1 flow out from the flow passage B, then the oil port g1 on the first core tube 9 is exposed from the piston 8, and the oil can enter the inner cavity of the first core tube 9 through the oil port g1 and further flow into the next oil cylinder.
Referring to fig. 2 and 3, the invention also discloses a multi-cylinder sequential telescopic mechanism, which consists of the sequential telescopic oil cylinder disclosed by the invention and a common oil cylinder, wherein the last oil cylinder is the common oil cylinder, and the rest oil cylinders are sequential telescopic oil cylinders.
The sequential telescoping process is further described herein by taking a sequential telescoping mechanism consisting of three cylinders as an example, wherein the first two cylinders are sequential telescoping cylinders and the third cylinder is a common cylinder. The cylinder barrel of the second sequential telescopic cylinder is relatively fixed with the cylinder rod of the first sequential telescopic cylinder, and the cylinder barrel of the common cylinder is relatively fixed with the cylinder rod of the second sequential telescopic cylinder. The full telescopic state is taken as a starting position, and at the moment, the stroke valve 5 of the first sequential telescopic cylinder and the stroke valve 14 of the second sequential telescopic cylinder are in a compressed state, so that the oil port h1 is communicated with the oil port k1, and the oil port h2 is communicated with the oil port k 2.
The sequential stretching process is as follows:
the first sequential telescopic oil cylinder stretches out: oil enters the rodless cavity from the A port of the first sequential telescopic oil cylinder through the a1 port, and at the moment, oil cannot flow into the inner cavity of the first core pipe 9 due to the action of the one-way valve on the first core pipe 9, so that the oil cannot enter the rodless cavity of the second sequential telescopic oil cylinder. The oil can only push the piston 8 of the first sequential telescopic oil cylinder to move, the oil with a rod cavity flows out from the port B of the flow channel through the oil port B1 or c1, when the piston 8 blocks the oil port B1, the oil port g1 on the first core tube 9 is exposed from the piston 8, the oil can enter the inner cavity of the first core tube 9 through the oil port g1, and enters the rodless cavity of the second sequential telescopic oil cylinder through the second core tube 6, the oil port m1 on the rod head 4 and the oil port a2 on the cylinder barrel 10 of the second sequential telescopic oil cylinder, and then the cylinder rod 2 of the first sequential telescopic oil cylinder basically extends completely.
The second sequential telescopic oil cylinder extends out: the oil enters the rodless cavity from the a2 port of the second sequential telescopic oil cylinder, and at the moment, the oil cannot flow into the inner cavity of the core tube 18 due to the action of the one-way valve on the core tube 18, so that the oil cannot enter the rodless cavity of the common oil cylinder. The oil can only push the piston 17 of the second sequential telescopic oil cylinder to move, the oil in the rod cavity of the second sequential telescopic oil cylinder sequentially flows out from the port B of the flow channel through the oil port k1, the third core tube 7, the oil port d1 and the oil port c1, when the piston 17 blocks the oil port B2, the oil g2 on the core tube 18 is exposed from the piston 17, the oil can enter the inner cavity of the core tube 18 through the oil g2, and enters the rodless cavity of the common oil cylinder through the core tube 15, the oil port m2 on the rod head 13 and the oil port a3 on the cylinder barrel 19 of the common oil cylinder, and at the moment, the cylinder rod 11 of the second sequential telescopic oil cylinder is basically fully extended. The stroke valve 5 on the first sequential expansion cylinder is closed while the second sequential expansion cylinder is extended.
The common oil cylinder stretches out: the oil enters the rodless cavity from the port a3 of the common oil cylinder, the oil pushes the piston 23 of the common oil cylinder to move, and the oil in the rod cavity of the common oil cylinder flows out from the port B of the flow channel through the oil port B3, sequentially passes through the oil port k2, the core tube 16, the oil port d2, the oil port c2, the oil port k1, the third core tube 7, the oil port d1 and the oil port c1, and finally the cylinder rod 20 extends out completely. And when the common oil cylinder stretches out, the stroke valve 5 on the second sequential telescopic oil cylinder is closed.
The sequential shrinking process is as follows:
the common oil cylinder is retracted: the oil flows in from the runner B of the first sequential telescopic cylinder, at this moment, the oil B1 is blocked by the piston 8, the oil can not flow into the rod cavity of the first sequential telescopic cylinder from the port B1, meanwhile, the travel valve 5 is in a disconnected state, the oil k1 is not communicated with the oil h1, therefore, the oil can only enter the second sequential telescopic cylinder through the oil c1, the oil d1, the oil f1, the third core tube 7 and the oil k1, at this moment, the oil B2 is blocked by the piston 17, the oil can not flow into the rod cavity of the second sequential telescopic cylinder from the port B2, meanwhile, the travel valve 14 is in a disconnected state, the oil k2 is not communicated with the oil h2, therefore, the oil can only enter the ordinary cylinder through the oil c2, the oil d2, the oil f2, the core tube 16 and the oil k2, and then enter the rod cavity of the ordinary cylinder through the oil B3, the oil pushes the piston 23 to move, and the oil in the ordinary cylinder rod cavity can sequentially flow out of the oil a3, the oil f2, the core tube 15, the oil g2, the oil a2, the oil m1, the oil f 6, the oil g1 and the oil a1 on the core tube 9 are completely compressed by the second core tube 9, the oil a is completely compressed by the travel valve 20, and the sequential telescopic cylinder is completely opened.
The second sequential telescopic cylinder retracts: after the common oil cylinder is retracted, the stroke valve 14 on the second sequential telescopic oil cylinder is pressed and opened, the oil port h2 is communicated with the oil port k2, at the moment, oil enters from the oil port c2, passes through the oil port d2, the oil port f2, the core tube 16, the oil port k2, the stroke valve 14, the oil port h2, the inner cavity of the cylinder rod 11 and the oil port e2, flows into the rod cavity of the second sequential telescopic oil cylinder, pushes the piston 17 to move, and as the piston 17 moves, the oil port d2 is gradually blocked by the cylinder rod 11, the oil port b2 is gradually opened, and at the moment, the oil directly enters the rod cavity from the oil port b 2. The rodless cavity oil of the second sequential telescopic oil cylinder flows out from the port A through the oil port a2, the oil port m1, the second core tube 6, the oil port g1 on the first core tube 9 and the oil port a1 in sequence until the cylinder rod 11 of the second sequential telescopic oil cylinder is completely retracted, and at the moment, the stroke valve 5 on the first sequential telescopic oil cylinder is pressed and opened.
The first sequential telescopic cylinder retracts: after the second sequential telescopic cylinder is retracted, the stroke valve 5 on the first sequential telescopic cylinder is pressed and opened, the oil port h1 is communicated with the oil port k1, at the moment, oil enters from the oil port c1, passes through the oil port d1, the oil port f1, the third core tube 7, the oil port k1, the stroke valve 5, the oil port h1, the inner cavity of the cylinder rod 2 and the oil port e1, flows into the rod cavity of the first sequential telescopic cylinder, pushes the piston 8 to move, and as the piston 8 moves, the oil port d1 is gradually blocked by the cylinder rod 2, the oil port b1 is gradually opened, and at the moment, the oil directly enters the rod cavity from the oil port b 1. The oil in the rodless cavity of the first sequential telescopic oil cylinder flows out from the port A through the oil port a1 until the cylinder rod 2 of the first sequential telescopic oil cylinder is completely retracted.
The sequential telescopic oil cylinder is characterized in that a one-way valve is further designed on a core tube fixed with the cylinder rod, so that oil in the inner cavity of the core tube is allowed to flow outside the tube in a one-way mode, and the aim of the sequential telescopic oil cylinder is to ensure that the telescopic mechanism can be recycled in any state without fully extending the oil cylinder and then recycling the oil cylinder.
Here, it is assumed that the three cylinders are in a state of extending half for special reasons, at this time, the oil port g1 on the first core tube 9 is not communicated with the rodless cavity of the first sequential telescopic cylinder, the oil port g2 on the core tube 18 is not communicated with the rodless cavity of the second sequential telescopic cylinder, and if the first core tube 9 and the core tube 18 are not provided with one-way valves, at this time, the second sequential telescopic cylinder and the common cylinder cannot be recovered because the oil in the rodless cavity cannot flow out. The invention designs the one-way valve, oil can pass through the one-way valve on the first core tube 9 from the rodless cavity of the oil port n1 of the first sequential telescopic oil cylinder, and pass through the one-way valve on the core tube 18 from the rodless cavity of the oil port n2 of the second sequential telescopic oil cylinder.
While the preferred embodiment of the present invention has been illustrated and described, it will be understood by those skilled in the art that the present invention may be embodied in other specific forms and equivalents thereof without departing from the spirit of the invention.
Claims (4)
1. The sequentially telescopic oil cylinder is characterized by comprising a cylinder barrel, wherein a piston is arranged at the bottom end in the cylinder barrel, a guide sleeve with an oil port is arranged at the top end in the cylinder barrel, a cylinder rod extending out of the cylinder barrel is connected to the piston, a rod head is connected to the top end of the cylinder rod, and the guide sleeve is movably sleeved on the outer peripheral side of the cylinder rod;
the cylinder barrel is internally and fixedly provided with a first core pipe, and an oil port is further formed in the first core pipe, so that the rodless cavity of the cylinder barrel is communicated with the inner cavity of the first core pipe when the oil cylinder is in a full-extension state;
one side of the cylinder barrel is provided with three oil ports, one oil port is communicated with a rod cavity of the cylinder barrel, one oil port is communicated with a rodless cavity of the cylinder barrel, and the other oil port is communicated with an oil port on the guide sleeve;
a second core pipe and a third core pipe are arranged in the cylinder rod and are respectively communicated with the two oil ducts on the rod head in a one-to-one correspondence manner, wherein the second core pipe is movably sleeved on the outer peripheral side of the first core pipe, and the third core pipe is communicated with the rod cavity of the cylinder barrel through an oil port on the cylinder rod;
an oil port is further formed in the cylinder rod and is communicated with a rod cavity and an inner cavity of the cylinder rod;
the rod head is also provided with an oil passage communicated with the inner cavity of the cylinder rod, and the rod head is provided with a travel valve for controlling the on-off of the oil passage and an oil passage corresponding to the third core pipe on the rod head;
the first core tube is provided with a control valve for controlling the flow direction of oil inside and outside the tube;
the control valve is a one-way valve;
the outside of cylinder is provided with the runner, the runner intercommunication the hydraulic fluid port that the cylinder has the pole chamber, and the hydraulic fluid port of uide bushing.
2. A multi-cylinder sequential telescopic mechanism based on the sequential telescopic cylinder as claimed in claim 1, and characterized by comprising a first sequential telescopic cylinder, a second sequential telescopic cylinder and a common cylinder;
the rod head of the first sequential telescopic oil cylinder is correspondingly communicated with the runner of the second core tube and is communicated with the oil port of the second sequential telescopic oil cylinder, which is communicated with the rodless cavity of the cylinder barrel;
the rod head of the first sequential telescopic oil cylinder is correspondingly communicated with the runner of the third core tube, and is communicated with two oil ports on one side of a cylinder barrel of the second sequential telescopic oil cylinder, wherein one oil port is communicated with a rod cavity of the cylinder barrel, and the other oil port is communicated with an oil port on the guide sleeve;
the rod head of the second sequential telescopic oil cylinder is connected with a touch piece for controlling the on-off of a travel valve of the first sequential telescopic oil cylinder;
the rod head of the first sequential telescopic cylinder is connected with the cylinder barrel of the second sequential telescopic cylinder through a connecting piece;
the rod head of the second sequential telescopic oil cylinder is correspondingly communicated with the flow passage of the second core tube and is communicated with the oil port of the rodless cavity of the common oil cylinder, which is communicated with the cylinder barrel;
the rod head of the second sequential telescopic oil cylinder is correspondingly communicated with the runner of the third core tube and is communicated with the oil port of the rod cavity of the common oil cylinder;
the rod head of the common oil cylinder is connected with a touch piece for controlling the on-off of a stroke valve of the second sequential telescopic oil cylinder;
the rod head of the second sequential telescopic oil cylinder is connected with the cylinder barrel of the common oil cylinder through a connecting piece.
3. The multi-cylinder sequential telescopic mechanism according to claim 2, wherein the common oil cylinder comprises a cylinder barrel, a piston is arranged at the bottom end in the cylinder barrel, a guide sleeve is arranged at the top end in the cylinder barrel, a cylinder rod extending out of the cylinder barrel is connected to the piston, a rod head is connected to the top end of the cylinder rod, and the guide sleeve is movably sleeved on the outer peripheral side of the cylinder rod;
one side of the cylinder barrel is provided with two oil ports, one oil port is communicated with a rod cavity of the cylinder barrel, and the other oil port is communicated with a rodless cavity of the cylinder barrel.
4. A crane comprising the multi-cylinder sequential telescoping mechanism of claim 2 or 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110136096.4A CN112797043B (en) | 2021-02-01 | 2021-02-01 | Sequential telescopic cylinder, multi-cylinder sequential telescopic mechanism and crane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110136096.4A CN112797043B (en) | 2021-02-01 | 2021-02-01 | Sequential telescopic cylinder, multi-cylinder sequential telescopic mechanism and crane |
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| CN112797043A CN112797043A (en) | 2021-05-14 |
| CN112797043B true CN112797043B (en) | 2023-06-02 |
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| CN119508305B (en) * | 2024-10-12 | 2026-04-14 | 中联重科股份有限公司 | Telescopic cylinder, multi-cylinder sequential telescopic hydraulic system and telescopic engineering machinery |
| CN120667438B (en) * | 2025-08-05 | 2026-04-24 | 韶关市起重机厂有限责任公司 | Sequential telescopic oil cylinder and control valve thereof |
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| US3871266A (en) * | 1973-07-16 | 1975-03-18 | Hyster Co | Hydraulic cylinder phasing system |
| CN103010976B (en) * | 2012-12-17 | 2014-12-24 | 中联重科股份有限公司 | Hydraulic system, horizontal outrigger system and construction machinery that control the sequential expansion and contraction of oil cylinders |
| CN203715094U (en) * | 2014-01-27 | 2014-07-16 | 徐州徐工随车起重机有限公司 | Hydraulic control system for controlling sequential expansion of double cylinders, suspension arm mechanism and crane |
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| CN204384727U (en) * | 2014-11-05 | 2015-06-10 | 徐州徐工随车起重机有限公司 | The hydraulic control system of twin-tub sequential telescopic, suspension arm mechanism and hoisting crane |
| CN105605022B (en) * | 2016-03-14 | 2018-06-12 | 三一帕尔菲格特种车辆装备有限公司 | A kind of Multi-cylinder sequential telescopic mechanism and engineering machinery |
| CN105864134A (en) * | 2016-04-22 | 2016-08-17 | 三帕尔菲格特种车辆装备有限公司 | Multi-oil-cylinder sequential telescopic system and crane |
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2021
- 2021-02-01 CN CN202110136096.4A patent/CN112797043B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103896155A (en) * | 2014-01-27 | 2014-07-02 | 徐州徐工随车起重机有限公司 | Hydraulic control system for controlling double cylinders to telescope sequentially, suspension arm mechanism and crane |
| CN109973463A (en) * | 2019-04-22 | 2019-07-05 | 韶关市起重机厂有限责任公司 | A kind of oil cylinder, Multi-cylinder sequential telescopic mechanism and engineering machinery that energy reliable sequence is flexible |
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