CN114294297B - Sequential telescopic oil cylinder system, control method and equipment thereof - Google Patents
Sequential telescopic oil cylinder system, control method and equipment thereof Download PDFInfo
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- CN114294297B CN114294297B CN202111648175.XA CN202111648175A CN114294297B CN 114294297 B CN114294297 B CN 114294297B CN 202111648175 A CN202111648175 A CN 202111648175A CN 114294297 B CN114294297 B CN 114294297B
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Abstract
The invention provides a sequential telescopic oil cylinder system, which is communicated with a rodless cavity of a multistage telescopic oil cylinder through a connecting pipeline, is communicated with a rod cavity of the multistage telescopic oil cylinder in a one-way through an oil way in a one-way, is sealed before the upper stage piston rod is completely extended through arranging a control oil way between a sealing cavity of a sealing device and a piston rod cavity, and is communicated after the upper stage piston rod is extended, so that the control of an oil return oil way of the next stage telescopic oil cylinder is realized; the invention realizes the sequential telescopic control of the telescopic cylinders of all stages by skillfully designing the telescopic cylinder oil way and reasonably applying the telescopic cylinder oil way and controlling the oil inlet oil way and the oil return oil way of the sequential telescopic cylinder system, and the sequential telescopic cylinder system has no mechanical collision of the control element and position limitation of the mechanical structure, so the system is more stable and reliable and has wider application range.
Description
Technical Field
The invention relates to the technical field of oil cylinders, in particular to a sequential telescopic oil cylinder system, a control method and equipment thereof.
Background
The hydraulic cylinder is a hydraulic actuating element which converts hydraulic energy into mechanical energy and performs linear reciprocating motion, has simple structure and reliable work, can avoid a speed reducing device when being used for realizing reciprocating motion, has no transmission clearance and stable motion, and is widely applied to hydraulic systems of various machines. The hydraulic cylinder basically comprises a cylinder barrel, a cylinder cover, a piston rod, a piston and a sealing device on the piston, wherein the bottom of the cylinder barrel is usually provided with an oil inlet end, the upper part of the cylinder barrel, which is close to the cylinder cover, is usually provided with an oil return end, a rodless cavity is formed between the piston and the bottom of the cylinder barrel, and a rod cavity is formed between the piston and the cylinder cover.
With the development of hydraulic technology and mechanical equipment, the application of the multi-stage oil cylinder is more and more, and the required application scene is more and more extensive; in the cantilever crane type automobile crane, the multistage telescopic oil cylinders are matched with cantilever crane structures of all stages to use, mechanical properties of the cantilever cranes of all stages are different, and the cantilever crane operation with good mechanical properties is preferentially used, so that the operation efficiency can be effectively improved, and the operation safety is ensured; therefore, achieving sequential control of the telescopic cylinders is an important issue in the art.
In the prior oil cylinder sequential expansion technology, as disclosed in the invention patent CN109973463A, an oil cylinder, a multi-oil cylinder sequential expansion mechanism and engineering machinery which can reliably and sequentially expand and contract are disclosed, and a stroke control valve and a stroke valve are adopted to control the on-off of an oil way, so that after a first piston rod is completely extended, the oil way of a rodless cavity of a next-stage oil cylinder is opened; the piston rod of the next oil cylinder is completely retracted to be communicated with the rod cavity of the last oil cylinder, so that reliable sequential expansion and contraction are realized; the technology realizes sequential expansion and contraction of the multi-stage oil cylinder, but the technology still has the following defects in practical application: (1) poor reliability and stability; the primary oil cylinder at least comprises a stroke control valve, a stroke valve and a plurality of pipelines, and the number of fault points is large; on one hand, the stroke control valve and the stroke valve are controlled by mechanical contact and even extrusion, loss and deviation are easy to occur in the use process, on the other hand, the energy of a hydraulic system is increased along with the increase of the number of stages of the oil cylinder, and the reliability and stability of a mechanical control structure are further influenced by acting force generated by the expansion and contraction of the oil cylinder; (2) limited applicable scope: the stroke control valve is arranged on the piston rod of the upper-stage oil cylinder and the lower-stage oil cylinder, and needs mechanical connection among the multi-stage oil cylinders, so that the application conditions of the sequential telescopic oil cylinders are greatly limited, the space utilization, the structural design and the like of engineering machinery are greatly limited, and the popularization and the application of the sequential telescopic oil cylinder technology are influenced.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a sequential telescopic cylinder with stable structure, strong reliability, wide applicable range and self-buffering performance and engineering machinery thereof.
The second object of the present invention is to provide a control method of a sequential telescopic cylinder system.
A third object of the present invention is to provide an apparatus for a sequential telescopic ram system.
The technical scheme of the invention is as follows:
a sequential telescopic oil cylinder system comprises n stages of telescopic oil cylinders, wherein n is an integer greater than or equal to 2, and the first n-1 stages adopt sequential telescopic oil cylinders; the sequential telescopic oil cylinder comprises an oil inlet end, a rodless cavity, a piston rod, a piston, a telescopic end, a rod cavity, an oil return end and a sealing device, and the sequential telescopic oil cylinder comprises the following specific structure:
the center of the piston rod is provided with a cavity, the telescopic end is provided with a first connecting oil port and a second connecting oil port, the first connecting oil port is communicated with the cavity, and the second connecting oil port is communicated with the rodless cavity through a connecting pipeline; the piston is provided with a first branch which is communicated with the cavity and the rod cavity, and a one-way valve which enables the rod cavity to be communicated to the cavity in one way is arranged in the first branch; the oil return end is provided with a control oil port at one side of the oil return port, which is close to the piston, a sealing cavity is arranged in the middle of the sealing device, the control oil port corresponds to the position of the sealing cavity in the state that the piston rod is completely extended, and a second branch for conducting the sealing cavity and the cavity is also arranged in the middle of the piston;
In the sequential telescopic oil cylinder system, an oil inlet end and an oil return end of a first-stage sequential telescopic oil cylinder are connected with a hydraulic system, a rodless cavity of an nth-stage telescopic oil cylinder is communicated with the rodless cavity of the nth-1-stage telescopic oil cylinder through an oil inlet end of the nth-stage telescopic oil cylinder and a second connecting oil port of the nth-1-stage telescopic oil cylinder, and a rod cavity of the nth-stage telescopic oil cylinder is communicated with a cavity of the nth-1-stage telescopic oil cylinder through an oil return end of the nth-stage telescopic oil cylinder and a first connecting oil port of the nth-1-stage telescopic oil cylinder.
Preferably, a connecting pipeline for communicating the second connecting oil port with the rodless cavity is arranged in the middle of the piston.
Preferably, a sealing layer is arranged between the connecting pipeline and the piston.
Preferably, the control oil port adopts a porous structure.
Preferably, the nth stage telescopic cylinders adopt sequential telescopic cylinders.
Preferably, the oil inlet end and the oil return end of the first-stage telescopic oil cylinder are connected with a hydraulic system, the oil inlet end of the nth-stage telescopic oil cylinder is communicated with the rodless cavity of the nth-1 stage telescopic oil cylinder through a second connecting oil port of the nth-1 stage telescopic oil cylinder, the oil return end of the nth-stage telescopic oil cylinder is communicated with the cavity of the nth-1 stage telescopic oil cylinder through a first connecting oil port of the nth-1 stage telescopic oil cylinder, and the first connecting oil port and the second connecting oil port of the nth-stage telescopic oil cylinder are closed and blocked.
A control method of a sequential telescopic oil cylinder system comprises two modes, namely an extension mode and a contraction mode:
the specific steps of the extended mode are as follows:
S1.1, a hydraulic system conveys hydraulic oil to an oil inlet end of a first-stage telescopic oil cylinder, the hydraulic oil enters a rodless cavity of the first-stage telescopic oil cylinder, and meanwhile, the hydraulic oil is conveyed to an oil inlet end of a next-stage telescopic oil cylinder through a connecting pipeline in the middle of a piston of the first-stage telescopic oil cylinder and a second connecting oil port of the first-stage telescopic oil cylinder to enter the rodless cavity of the next-stage telescopic oil cylinder until the hydraulic oil is conveyed to the rodless cavity of each-stage telescopic oil cylinder;
S1.2, the oil pressure of the rodless cavity is increased, the piston rod is subjected to hydraulic thrust, and the oil is discharged from the rod cavity to the oil return end;
S1.3, discharging oil with a rod cavity of the first-stage telescopic oil cylinder to a hydraulic system through an oil return end of the first-stage telescopic oil cylinder, and extending a piston rod of the first-stage telescopic oil cylinder; the oil in the rod cavity of the next-stage telescopic oil cylinder flows to a first branch and a second branch of the cavity through an oil return end via a first connecting oil port and the cavity of the previous-stage telescopic oil cylinder, the first branch check valve prevents the oil from being discharged, the tail end of the second branch is a sealed cavity, the oil in the sealed cavity is formed, and a piston rod of the next-stage telescopic oil cylinder cannot extend;
S1.4, a piston rod of a first-stage telescopic oil cylinder extends completely, a sealing cavity of the first-stage telescopic oil cylinder is communicated with a control oil port, oil in a rod cavity of a next-stage telescopic oil cylinder is discharged through a second branch of a cavity of a previous-stage telescopic oil cylinder, and the piston rod of the next-stage telescopic oil cylinder begins to extend;
s1.5, the piston rod of the sequential telescopic oil cylinder extends step by step in sequence;
the shrinkage mode comprises the following specific steps:
S2.1, conveying hydraulic oil to an oil return end of a first-stage telescopic oil cylinder by a hydraulic system, enabling the hydraulic oil to enter a rod cavity of the first-stage telescopic oil cylinder, conveying the hydraulic oil to a cavity of the first-stage telescopic oil cylinder through a first branch of the first-stage telescopic oil cylinder, conveying the hydraulic oil to the rod cavity of a next-stage telescopic oil cylinder through a first connecting oil port of the first-stage telescopic oil cylinder and an oil return end of the next-stage telescopic oil cylinder, and gradually conveying the hydraulic oil to the rod cavity of each stage telescopic oil cylinder;
s2.2, the oil pressure of a rod cavity is increased, a piston rod is subjected to hydraulic thrust, and the rodless cavity discharges oil to an oil inlet end;
S2.3, a piston rod of the first-stage telescopic oil cylinder is compressed and contracted, and oil in a rodless cavity of the first-stage telescopic oil cylinder is discharged to a hydraulic system from an oil inlet end of the first-stage telescopic oil cylinder; the other piston rods shrink, the piston rods of the next-stage telescopic cylinders are pushed by pressure to push the oil in the rodless cavity to be output from the oil inlet end to the second connecting oil port of the previous-stage telescopic cylinder, the oil is conveyed to the rodless cavity of the previous-stage telescopic cylinder, and finally the oil is discharged to a hydraulic system from the rodless cavity of the first-stage telescopic cylinder;
s2.4, the piston rods of all stages are contracted.
Preferably, the specification of the n-stage telescopic cylinders is gradually decreased from the first-stage telescopic cylinder, and in the sequential cylinder system shrinkage mode, each stage of telescopic cylinders sequentially shrink from the first-stage telescopic cylinder.
Preferably, the n-level telescopic cylinders have the same specification, and each level of telescopic cylinders synchronously shrink in a sequential cylinder system shrinkage mode.
An apparatus for a sequential telescopic ram system comprising a sequential telescopic ram system as described above.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a sequential telescopic oil cylinder system, which is communicated with a rodless cavity of a multistage telescopic oil cylinder through a connecting pipeline, is communicated with a rod cavity of the multistage telescopic oil cylinder in a one-way through an oil way in a one-way, is sealed before the upper stage piston rod is completely extended through arranging a control oil way between a sealing cavity of a sealing device and a piston rod cavity, and is communicated after the upper stage piston rod is extended, so that the control of an oil return oil way of the next stage telescopic oil cylinder is realized; the invention realizes the sequential telescopic control of the telescopic cylinders of all stages by skillfully designing the telescopic cylinder oil way and reasonably applying the telescopic cylinder oil way and controlling the oil inlet oil way and the oil return oil way of the sequential telescopic cylinder system, and the sequential telescopic cylinder system has no mechanical collision of the control element and position limitation of the mechanical structure, so the system is more stable and reliable and has wider application range.
Drawings
Fig. 1 is a schematic structural diagram of a sequential telescopic ram system.
Fig. 2 is a partial enlarged view of a in fig. 1.
Fig. 3 is a schematic diagram of the porous structure of the control port in example 1.
Fig. 4 is a partial enlarged view of B in fig. 1.
Fig. 5 is a flow chart of a sequential telescopic ram system extension mode.
Fig. 6 is a schematic view of the structure with the first stage piston rod fully extended.
Fig. 7 is a flow chart of a sequential telescopic ram system retraction mode.
Wherein: 100. an oil inlet end; 101. a rodless cavity; 102. a rod cavity is arranged; 103. an oil return end; 1031. an oil return port; 1032. an oil port is controlled; 200. a piston rod; 201. a piston; 2011. sealing the cavity; 202. a telescoping end; 2021. a first connecting oil port; 2022. the second connecting oil port; 203. a cavity; 2031. a first branch; 2032. a second branch; 2033. a one-way valve; 300. a connecting pipeline; 301. and (3) a sealing layer.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
For the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1 to 4, in one aspect, the present invention provides a sequential telescopic cylinder system, including n stages of telescopic cylinders, where n is an integer greater than or equal to 2, and the first n-1 stages adopt sequential telescopic cylinders; the sequential telescopic oil cylinder comprises an oil inlet end 100, a rodless cavity 101, a piston rod 200, a piston 201, a telescopic end 202, a rod cavity 102, an oil return end 103 and a sealing device, and the specific structure is as follows:
The center of the piston rod 200 is provided with a cavity 203, the telescopic end 202 is provided with a first connecting oil port 2021 and a second connecting oil port 2022, the first connecting oil port 2021 is communicated with the cavity 203, and the second connecting oil port 2022 is communicated with the rodless cavity 101 through a connecting pipeline 300; the piston 201 is provided with a conduction cavity 203 and a first branch 2031 of the rod cavity 102, and a one-way valve 2033 which enables the rod cavity 102 to be conducted to the cavity 203 in one way is arranged in the first branch 2031; the oil return end 103 is provided with a control oil port 1032 at one side of the oil return port 1031, which is close to the piston 201, a sealing cavity 2011 is arranged in the middle of the sealing device, the control oil port 1032 corresponds to the position of the sealing cavity 2011 in the completely extended state of the piston rod 200, and a second branch 2032 for conducting the sealing cavity 2011 and the cavity 203 is also arranged in the middle of the piston 201;
In the sequential telescopic oil cylinder system, an oil inlet end 100 and an oil return end 103 of a first-stage sequential telescopic oil cylinder are connected with a hydraulic system, a rodless cavity 101 of an nth-stage telescopic oil cylinder is communicated with the rodless cavity 101 of the nth-1-stage telescopic oil cylinder through the oil inlet end 100 of the nth-stage telescopic oil cylinder and a second connecting oil port 2022 of the nth-1-stage telescopic oil cylinder, and a rod cavity 102 of the nth-stage telescopic oil cylinder is communicated with a cavity 203 of the nth-1-stage telescopic oil cylinder through the oil return end 103 of the nth-stage telescopic oil cylinder and a first connecting oil port 2021 of the nth-1-stage telescopic oil cylinder.
A connection pipe 300, in which the second connection port 2022 communicates with the rod-less chamber 101, is disposed in the middle of the piston 201.
It should be noted that, the connecting pipeline 300 is arranged in the middle of the piston 201, and by improving the internal structure of the oil cylinder, the arrangement of sequential telescopic oil paths is realized, the influence of external environment on the telescopic oil cylinder is reduced, and the stability is better.
A sealing layer 301 is arranged between the connecting pipeline 300 and the piston 201.
In the sequential cylinder, the rodless chamber 101 is directly connected to the next-stage rodless chamber 101 through a connecting pipe, and the rodless chamber 101 is isolated from the rod chamber 102, the cavity 203, the first branch 2031, and the second branch 2032.
The control port 1032 adopts a porous structure.
When the piston rod 200 extends and the piston 201 moves to the control oil port 1032, the sealing ring of the sealing device passes through the control oil port 1032, and under the action of the oil pressure in the cylinder, the oil presses the sealing ring to the control oil port 1032, which is easy to cause deformation or even damage of the sealing ring, so the control oil port 1032 is set to 7The porous structure formed by the holes can effectively protect the sealing ring; the total oil passing capacity of the porous structure is the same as that of the oil return port.
The nth stage telescopic cylinder adopts a sequential telescopic cylinder.
The oil inlet end 100 and the oil return end 103 of the first-stage telescopic oil cylinder are connected with a hydraulic system, the oil inlet end 100 of the nth-stage telescopic oil cylinder is communicated with the rodless cavity 101 of the nth-1 stage telescopic oil cylinder through a second connecting oil port 2022 of the nth-1 stage telescopic oil cylinder, the oil return end 103 of the nth-stage telescopic oil cylinder is communicated with the cavity 203 of the nth-1 stage telescopic oil cylinder through a first connecting oil port 2021 of the nth-1 stage telescopic oil cylinder, and the first connecting oil port 2021 and the second connecting oil port 2022 of the nth-stage telescopic oil cylinder are closed and blocked.
Example 2:
the embodiment provides a control method of a sequential telescopic oil cylinder system, which comprises two modes, namely an extension mode and a contraction mode:
as shown in fig. 5, the specific steps of the extended mode are as follows:
The method comprises the following steps that S1.1 a hydraulic system conveys hydraulic oil to an oil inlet end 100 of a first-stage telescopic oil cylinder, the hydraulic oil enters a rodless cavity 101 of the first-stage telescopic oil cylinder, and meanwhile, the hydraulic oil is conveyed to an oil inlet end 100 of a next-stage telescopic oil cylinder through a connecting pipeline 300 in the middle of a piston 201 of the first-stage telescopic oil cylinder and a second connecting oil port 2022 of the first-stage telescopic oil cylinder, enters the rodless cavity 101 of the next-stage telescopic oil cylinder until the hydraulic oil is conveyed to the rodless cavity 101 of each-stage telescopic oil cylinder;
s1.2, the oil pressure of the rodless cavity 101 is increased, the piston rod 200 receives hydraulic thrust, and the oil is discharged from the rod cavity 102 to the oil return end 103;
S1.3, discharging oil in a rod cavity 102 of a first-stage telescopic oil cylinder to a hydraulic system through an oil return end 103 of the first-stage telescopic oil cylinder, and extending a piston rod 200 of the first-stage telescopic oil cylinder; the oil in the rod cavity 102 of the next-stage telescopic oil cylinder flows to the first branch 2031 and the second branch 2032 of the cavity 203 through the oil return end 103 via the first connecting oil port 2021 and the cavity 203 of the previous-stage telescopic oil cylinder, the one-way valve 2033 of the first branch 2031 prevents the oil from being discharged, the tail end of the second branch 2032 is provided with a sealing cavity 2011, so that the oil in the sealing cavity cannot be discharged, and the piston rod 200 of the next-stage telescopic oil cylinder cannot extend;
S1.4, a piston rod 200 of the first-stage telescopic cylinder is completely extended, and a sealing cavity 2011 of the first-stage telescopic cylinder is communicated with a control oil port 1032, as shown in FIG. 6; the oil in the rod cavity 102 of the lower-stage telescopic oil cylinder is discharged through the second branch 2032 of the cavity 203 of the upper-stage telescopic oil cylinder, and the piston rod 200 of the lower-stage telescopic oil cylinder starts to extend;
S1.5, the piston rod 200 of the sequential telescopic oil cylinder extends step by step in sequence;
as shown in FIG. 7, the shrinkage pattern is specifically as follows:
s2.1, the hydraulic system conveys hydraulic oil to the oil return end 103 of the first-stage telescopic oil cylinder, the hydraulic oil enters the rod cavity 102 of the first-stage telescopic oil cylinder and is conveyed to the cavity 203 of the first-stage telescopic oil cylinder through the first branch 2031 of the first-stage telescopic oil cylinder, and is conveyed to the rod cavity 102 of the next-stage telescopic oil cylinder through the first connecting oil port 2021 of the first-stage telescopic oil cylinder and the oil return end 103 of the next-stage telescopic oil cylinder and is gradually conveyed to the rod cavity 102 of each-stage telescopic oil cylinder;
s2.2, the oil pressure of the rod cavity 102 is increased, the piston rod 200 is subjected to hydraulic thrust, and the rodless cavity 101 discharges oil to the oil inlet end 100;
S2.3, a piston rod 200 of the first-stage telescopic oil cylinder is compressed and contracted, and oil in a rodless cavity 101 of the first-stage telescopic oil cylinder is discharged to a hydraulic system from an oil inlet end 100 of the first-stage telescopic oil cylinder; the other piston rods 200 are contracted, the piston rods 200 of the next-stage telescopic cylinders are pressed to push the oil in the rodless cavity 101 to be output from the oil inlet end 100 to the second connecting oil port 2022 of the previous-stage telescopic cylinder, the oil is conveyed to the rodless cavity 101 of the previous-stage telescopic cylinder, and finally the oil is discharged to a hydraulic system from the rodless cavity 101 of the first-stage telescopic cylinder;
S2.4 effects retraction of the respective stage piston rod 200.
The n-level telescopic cylinders have the same specification, and each level of telescopic cylinders synchronously shrink in a sequential cylinder system shrinkage mode.
Example 3:
The embodiment provides a control method of a sequential telescopic oil cylinder system for sequential retraction; the shrinkage mode comprises the following specific steps:
s2.1, the hydraulic system conveys hydraulic oil to the oil return end 103 of the first-stage telescopic oil cylinder, the hydraulic oil enters the rod cavity 102 of the first-stage telescopic oil cylinder and is conveyed to the cavity 203 of the first-stage telescopic oil cylinder through the first branch 2031 of the first-stage telescopic oil cylinder, and is conveyed to the rod cavity 102 of the next-stage telescopic oil cylinder through the first connecting oil port 2021 of the first-stage telescopic oil cylinder and the oil return end 103 of the next-stage telescopic oil cylinder and is gradually conveyed to the rod cavity 102 of each-stage telescopic oil cylinder;
s2.2, the oil pressure of the rod cavity 102 is increased, the piston rod 200 is subjected to hydraulic thrust, and the rodless cavity 101 discharges oil to the oil inlet end 100;
S2.3, a piston rod 200 of the first-stage telescopic oil cylinder is compressed and contracted, and oil in a rodless cavity 101 of the first-stage telescopic oil cylinder is discharged to a hydraulic system from an oil inlet end 100 of the first-stage telescopic oil cylinder; the other piston rods 200 are contracted, the piston rods 200 of the next-stage telescopic cylinders are pressed to push the oil in the rodless cavity 101 to be output from the oil inlet end 100 to the second connecting oil port 2022 of the previous-stage telescopic cylinder, the oil is conveyed to the rodless cavity 101 of the previous-stage telescopic cylinder, and finally the oil is discharged to a hydraulic system from the rodless cavity 101 of the first-stage telescopic cylinder;
S2.4 effects retraction of the respective stage piston rod 200.
The specifications of the three-stage telescopic cylinders are gradually decreased from the first-stage telescopic cylinders, and the first-stage sequential telescopic cylinders are sequentially contracted from the first-stage telescopic cylinders in a sequential cylinder system contraction mode.
Example 4:
the embodiment provides equipment of a sequential telescopic oil cylinder system, which comprises the following sequential telescopic oil cylinder systems:
The hydraulic control system comprises n stages of telescopic cylinders, wherein n is an integer greater than or equal to 2, and the first n-1 stages adopt sequential telescopic cylinders; the sequential telescopic oil cylinder comprises an oil inlet end 100, a rodless cavity 101, a piston rod 200, a piston 201, a telescopic end 202, a rod cavity 102, an oil return end 103 and a sealing device, and the specific structure is as follows:
The center of the piston rod 200 is provided with a cavity 203, the telescopic end 202 is provided with a first connecting oil port 2021 and a second connecting oil port 2022, the first connecting oil port 2021 is communicated with the cavity 203, and the second connecting oil port 2022 is communicated with the rodless cavity 101 through a connecting pipeline 300; the piston 201 is provided with a conduction cavity 203 and a first branch 2031 of the rod cavity 102, and a one-way valve 2033 which enables the rod cavity 102 to be conducted to the cavity 203 in one way is arranged in the first branch 2031; the oil return end 103 is provided with a control oil port 1032 at one side of the oil return port 1031, which is close to the piston 201, a sealing cavity 2011 is arranged in the middle of the sealing device, the control oil port 1032 corresponds to the position of the sealing cavity 2011 in the completely extended state of the piston rod 200, and a second branch 2032 for conducting the sealing cavity 2011 and the cavity 203 is also arranged in the middle of the piston 201;
In the sequential telescopic oil cylinder system, an oil inlet end 100 and an oil return end 103 of a first-stage sequential telescopic oil cylinder are connected with a hydraulic system, a rodless cavity 101 of an nth-stage telescopic oil cylinder is communicated with the rodless cavity 101 of the nth-1-stage telescopic oil cylinder through the oil inlet end 100 of the nth-stage telescopic oil cylinder and a second connecting oil port 2022 of the nth-1-stage telescopic oil cylinder, and a rod cavity 102 of the nth-stage telescopic oil cylinder is communicated with a cavity 203 of the nth-1-stage telescopic oil cylinder through the oil return end 103 of the nth-stage telescopic oil cylinder and a first connecting oil port 2021 of the nth-1-stage telescopic oil cylinder.
A connection pipe 300, in which the second connection port 2022 communicates with the rod-less chamber 101, is disposed in the middle of the piston 201.
A sealing layer 301 is arranged between the connecting pipeline 300 and the piston 201.
The control port 1032 adopts a porous structure.
The nth stage telescopic cylinder adopts a sequential telescopic cylinder.
The oil inlet end 100 and the oil return end 103 of the first-stage telescopic oil cylinder are connected with a hydraulic system, the oil inlet end 100 of the nth-stage telescopic oil cylinder is communicated with the rodless cavity 101 of the nth-1 stage telescopic oil cylinder through a second connecting oil port 2022 of the nth-1 stage telescopic oil cylinder, the oil return end 103 of the nth-stage telescopic oil cylinder is communicated with the cavity 203 of the nth-1 stage telescopic oil cylinder through a first connecting oil port 2021 of the nth-1 stage telescopic oil cylinder, and the first connecting oil port 2021 and the second connecting oil port 2022 of the nth-stage telescopic oil cylinder are closed and blocked.
The same or similar reference numerals correspond to the same or similar components;
the terms describing the positional relationship in the drawings are merely illustrative, and are not to be construed as limiting the present patent;
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (7)
1. The utility model provides a flexible hydro-cylinder system of order which characterized in that: the hydraulic control system comprises n stages of telescopic cylinders, wherein n is an integer greater than or equal to 2, and the first n-1 stages adopt sequential telescopic cylinders; the sequential telescopic oil cylinder comprises an oil inlet end (100), a rodless cavity (101), a piston rod (200), a piston (201), a telescopic end (202), a rod cavity (102), an oil return end (103) and a sealing device, and the sequential telescopic oil cylinder has the following specific structure:
A cavity (203) is arranged in the center of the piston rod (200), a first connecting oil port (2021) and a second connecting oil port (2022) are formed in the telescopic end (202), the first connecting oil port (2021) is communicated with the cavity (203), and the second connecting oil port (2022) is communicated with the rodless cavity (101) through a connecting pipeline (300); the piston (201) is provided with a first branch (2031) for conducting the cavity (203) and the rod cavity (102), and a one-way valve (2033) for conducting the rod cavity (102) to the cavity (203) in one way is arranged in the first branch (2031); the oil return end (103) is provided with a control oil port (1032) at one side of the oil return port (1031) close to the piston (201), a sealing cavity (2011) is arranged in the middle of the sealing device, the control oil port (1032) corresponds to the position of the sealing cavity (2011) in the completely extended state of the piston rod (200), and a second branch (2032) for conducting the sealing cavity (2011) and the cavity (203) is also arranged in the middle of the piston (201);
In the sequential telescopic oil cylinder system, an oil inlet end (100) and an oil return end (103) of a first-stage sequential telescopic oil cylinder are connected with a hydraulic system, a rodless cavity (101) of an nth-stage telescopic oil cylinder is communicated with the rodless cavity (101) of the nth-1-stage telescopic oil cylinder through the oil inlet end (100) of the nth-stage telescopic oil cylinder and a second connecting oil port (2022) of the nth-1-stage telescopic oil cylinder, and a rod cavity (102) of the nth-stage telescopic oil cylinder is communicated with a cavity (203) of the nth-1-stage telescopic oil cylinder through the oil return end (103) of the nth-stage telescopic oil cylinder and a first connecting oil port (2021) of the nth-1-stage telescopic oil cylinder;
the control oil port (1032) adopts a porous structure;
The nth stage telescopic cylinder adopts a sequential telescopic cylinder;
The oil inlet end (100) and the oil return end (103) of the first-stage telescopic oil cylinder are connected with a hydraulic system, the oil inlet end (100) of the nth-stage telescopic oil cylinder is communicated with a rodless cavity (101) of the nth-1-stage telescopic oil cylinder through a second connecting oil port (2022) of the nth-1-stage telescopic oil cylinder, the oil return end (103) of the nth-stage telescopic oil cylinder is communicated with a cavity (203) of the nth-1-stage telescopic oil cylinder through a first connecting oil port (2021) of the nth-1-stage telescopic oil cylinder, and the first connecting oil port (2021) and the second connecting oil port (2022) of the nth-stage telescopic oil cylinder are closed and blocked.
2. The sequential telescopic ram system according to claim 1, wherein the connection line (300) with which the rod-less chamber (101) communicates with the second connection port (2022) is arranged in the middle of the piston (201).
3. The sequential telescopic ram system according to claim 2, wherein a sealing layer (301) is provided between the connecting line (300) and the piston (201).
4. A control method of a sequential telescopic ram system according to claim 1, comprising two modes of an extension mode and a retraction mode:
the specific steps of the extended mode are as follows:
The method comprises the following steps that S1.1 a hydraulic system conveys hydraulic oil to an oil inlet end (100) of a first-stage telescopic oil cylinder, the hydraulic oil enters a rodless cavity (101) of the first-stage telescopic oil cylinder, and meanwhile, the hydraulic oil is conveyed to the oil inlet end (100) of a next-stage telescopic oil cylinder to enter the rodless cavity (101) of the next-stage telescopic oil cylinder through a connecting pipeline (300) in the middle of a piston (201) of the first-stage telescopic oil cylinder and a second connecting oil port (2022) of the first-stage telescopic oil cylinder until the hydraulic oil is conveyed to the rodless cavity (101) of each-stage telescopic oil cylinder;
s1.2, the oil pressure of the rodless cavity (101) rises, the piston rod (200) receives hydraulic thrust, and the oil is discharged from the rod cavity (102) to the oil return end (103);
S1.3, discharging oil in a rod cavity (102) of the first-stage telescopic oil cylinder to a hydraulic system through an oil return end (103) of the first-stage telescopic oil cylinder, and extending a piston rod (200) of the first-stage telescopic oil cylinder; the oil in the rod cavity (102) of the next-stage telescopic oil cylinder flows to a first branch (2031) and a second branch (2032) of the cavity (203) through a first connecting oil port (2021) and a cavity (203) of the previous-stage telescopic oil cylinder by an oil return end (103), the oil is prevented from being discharged by a one-way valve (2033) of the first branch (2031), and a sealing cavity (2011) is arranged at the tail end of the second branch (2032), so that the oil in the sealing cavity cannot be discharged, and a piston rod (200) of the next-stage telescopic oil cylinder cannot extend;
S1.4, a piston rod (200) of a first-stage telescopic oil cylinder fully extends, a sealing cavity (2011) of the first-stage telescopic oil cylinder is communicated with a control oil port (1032), oil in a rod cavity (102) of a next-stage telescopic oil cylinder is discharged through a second branch (2032) of a cavity (203) of an upper-stage telescopic oil cylinder, and the piston rod (200) of the next-stage telescopic oil cylinder starts to extend;
s1.5 is similar, and the piston rod (200) of the sequential telescopic oil cylinder extends step by step in sequence;
the shrinkage mode comprises the following specific steps:
S2.1, a hydraulic system conveys hydraulic oil to an oil return end (103) of a first-stage telescopic oil cylinder, the hydraulic oil enters a rod cavity (102) of the first-stage telescopic oil cylinder and is conveyed to a cavity (203) of the first-stage telescopic oil cylinder through a first branch (2031) of the first-stage telescopic oil cylinder, and is conveyed to the rod cavity (102) of a next-stage telescopic oil cylinder through a first connecting oil port (2021) of the first-stage telescopic oil cylinder and the oil return end (103) of the next-stage telescopic oil cylinder and is gradually conveyed to the rod cavity (102) of each-stage telescopic oil cylinder;
S2.2, the oil pressure of a rod cavity (102) is increased, a piston rod (200) is subjected to hydraulic thrust, and the rodless cavity (101) discharges oil to an oil inlet end (100);
S2.3, a piston rod (200) of the first-stage telescopic oil cylinder is compressed and contracted, and oil in a rodless cavity (101) of the first-stage telescopic oil cylinder is discharged to a hydraulic system from an oil inlet end (100) of the first-stage telescopic oil cylinder; the other piston rods (200) shrink, the piston rods (200) of the next-stage telescopic cylinders push the rodless cavity (101) to be pressed, oil is output from the oil inlet end (100) to the second connecting oil port (2022) of the previous-stage telescopic cylinders and is conveyed to the rodless cavity (101) of the previous-stage telescopic cylinders, and finally the oil is discharged from the rodless cavity (101) of the first-stage telescopic cylinders to a hydraulic system;
s2.4 realizes the contraction of the piston rods (200) of each stage.
5. The method for controlling a sequential telescopic ram system according to claim 4, wherein the n-stage telescopic ram specifications are gradually decreased from the first-stage telescopic ram, and each stage telescopic ram is sequentially contracted from the first-stage telescopic ram in the sequential ram system contraction mode.
6. The method for controlling a sequential telescopic ram system according to claim 4, wherein the n-stage telescopic rams are identical in specification, and the telescopic rams at each stage are contracted synchronously in the sequential ram system contraction mode.
7. An apparatus for a sequential telescopic ram system comprising the sequential telescopic ram system of claim 1.
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| CN216642650U (en) * | 2021-12-29 | 2022-05-31 | 广东南曦液压机械有限公司 | Oil cylinder structure and multi-stage oil cylinder device thereof |
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