CN111439690A - Multi-oil-cylinder sequential telescopic hydraulic system and control method - Google Patents
Multi-oil-cylinder sequential telescopic hydraulic system and control method Download PDFInfo
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- CN111439690A CN111439690A CN202010398937.4A CN202010398937A CN111439690A CN 111439690 A CN111439690 A CN 111439690A CN 202010398937 A CN202010398937 A CN 202010398937A CN 111439690 A CN111439690 A CN 111439690A
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- 239000003921 oil Substances 0.000 claims abstract description 349
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims description 13
- 238000012423 maintenance Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
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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
- F15B13/07—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors in distinct sequence
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Abstract
A multi-cylinder sequential telescopic hydraulic system and a control method. The hydraulic control reversing valve comprises a primary oil cylinder, a secondary oil cylinder, a stroke valve assembly and a hydraulic control reversing valve assembly. Hydraulic oil enters the oil duct b and enters the rodless cavity of the primary cylinder through the oil duct d, the first one-way valve and the oil duct c; due to the limitation of the hydraulic control reversing valve assembly, hydraulic oil cannot enter the rodless cavity of the secondary cylinder; the first-stage cylinder barrel drives the first telescopic arm, the second telescopic arm and the second-stage cylinder to extend out; when the primary oil cylinder is completely extended out, the oil duct f on the primary cylinder piston is communicated with the oil duct h on the primary cylinder barrel, the hydraulic control reversing valve is pushed, and hydraulic oil sequentially passes through the oil duct e, the oil duct g and the oil duct k and enters the rodless cavity of the secondary cylinder, namely the secondary cylinder barrel drives the secondary arm to extend out. The invention has the characteristics of exquisite and reasonable structure, small pressure loss, stable performance, simple and convenient control and maintenance and the like.
Description
Technical Field
The invention relates to a telescopic hydraulic control system of a crane boom, in particular to a multi-cylinder sequential telescopic hydraulic system and a control method.
Background
At present, the telescopic arm of the crane is usually operated in a telescopic way by adopting the following methods:
using a hydraulic sequence valve + mechanical stroke valve: the sequence valve firstly opens a valve with small pressure and then opens a valve with large pressure when the oil cylinder moves by setting different pressures, and controls the expansion sequence of the oil cylinder by setting the pressure; the sequence valve has the defects that the sequential expansion is uncontrollable, when the oil cylinders are pushed by large pressure due to large load, the sequence valve is opened at the same time, the phenomenon that a plurality of oil cylinders expand and contract at the same time occurs, and the sequential action cannot be guaranteed; in addition, the sequence valve consumes a part of system pressure, the pressure for the oil cylinder is reduced, the thrust of the oil cylinder is greatly reduced, and the telescopic capacity of the oil cylinder is greatly reduced. The mechanical stroke valve jacks the one-way valve through the collision block, the starting thrust is large, the impact is large, the collision pin reduces the area of a hydraulic flow passage, and the defects of high oil return back pressure, large pressure loss, quick temperature rise of a hydraulic system and the like are caused;
a mechanical stroke valve: the sequential stretching of the oil cylinder opens a related oil way at the tail end of the stroke of the oil cylinder through a mechanical structure to realize the sequential stretching of the oil cylinder; the structure has the defects that the overlong mechanical structure reduces the reliability of oil circuit switching, increases the maintenance difficulty and cost and reduces the use economy.
Double one-way valve + mechanical stroke valve: the oil cylinder extends out by using a double one-way valve and a double channel, and is matched with an oil port at the tail end of a stroke to realize sequential extension, the oil cylinder retracts by using a mechanical stroke valve, and a retraction oil path is opened at the tail end of the stroke of the oil cylinder to realize sequential retraction. The structure has the defects of complex structure of the oil cylinder, high manufacturing requirement of the oil cylinder, low yield, high cost of the oil cylinder and high maintenance difficulty and cost of inner leakage of the oil cylinder.
In the prior patent document, as a space name "hydraulic sequential telescopic mechanism and engineering machinery" issued by the national intellectual property office 2014, 6, 11, an invention patent with application number 201320692507.9 is disclosed. The hydraulic sequential telescoping mechanism comprises a primary oil cylinder, a secondary oil cylinder, a sequence valve, a stroke valve and a limiting device arranged on the secondary oil cylinder, wherein the limiting device touches the stroke valve when the primary oil cylinder and the secondary oil cylinder are in a contraction state, a first oil duct is communicated with a rod cavity of the primary oil cylinder, a second oil duct is communicated with an oil inlet of the stroke valve and an oil inlet of the sequence valve when extending into a rodless cavity of the primary oil cylinder and combining, an oil outlet of the stroke valve is communicated with the rodless cavity of the secondary oil cylinder, two ends of a third oil duct are respectively communicated with the rod cavity of the primary oil cylinder and the rod cavity of the secondary oil cylinder, one end of a fourth oil duct is communicated with the rodless cavity of the secondary oil cylinder, and the other end of the fourth oil. The scheme is used for solving the problem that in the arm retracting process, the rodless cavity of the primary oil cylinder is forcibly locked through the stroke valve, so that the arm retracting action cannot generate misoperation due to different environmental conditions. However, the pressure of the hydraulic system is partially consumed to overcome the pressure of the sequence valve, the actual pressure for extending the oil cylinder is obviously reduced, and the pressure loss is large.
In the prior patent literature, a space issued by the national intellectual property office 2017, 12 and 22 is named as 'a sequential hydraulic cylinder group', and the invention patent with the application number of '2017205889980'. Comprises a primary hydraulic cylinder, a secondary hydraulic cylinder and a control valve; the control valve comprises a valve body, a first channel, a second channel and a third channel are arranged in the valve body, the first channel and the third channel are respectively communicated with the second channel, a first valve mechanism for controlling the on-off of the first channel and the second channel and a second valve mechanism for controlling the on-off of the second channel and the third channel are arranged in the valve body, the first channel is communicated with a rodless cavity of the secondary hydraulic cylinder, and the third channel is communicated with a rodless cavity of the primary hydraulic cylinder. The sequential hydraulic cylinder group with the structure has an overlong mechanical mechanism, so that the reliability and the stability are reduced when the oil way is switched.
In the prior patent literature, for example, the publication issued on 12.6.2018 is entitled "a multi-cylinder sequential telescopic mechanism and a construction machine", and the application number is "201610143635.6". The hydraulic cylinder comprises a first oil cylinder, a second oil cylinder and a third oil cylinder, wherein the first oil cylinder, the second oil cylinder and the third oil cylinder respectively comprise a piston rod, a cylinder barrel, a rodless cavity oil way and a rod cavity oil way, stroke valves are arranged between the first oil cylinder and the second oil cylinder and between the second oil cylinder and the third oil cylinder, stroke valve limiting plates are arranged at the tail ends of the cylinder barrels of the second oil cylinder and the third oil cylinder, and the stroke valves are in contact with the stroke valve limiting plates to realize work position switching; communicating pipes for communicating adjacent oil cylinders are arranged among the first oil cylinder, the second oil cylinder and the third oil cylinder; and the first oil cylinder and the second oil cylinder are both provided with oil guide pipelines, wherein each oil guide pipeline comprises an outer pipe and an inner pipe, the M end of each outer pipe is connected with the piston rod, and the N end of each inner pipe is connected with the cylinder barrel. The oil cylinder sequential telescopic mechanism with the structure has the problems of complex structure, inconvenient maintenance, increased diameter of a piston rod, high manufacturing cost and the like.
Disclosure of Invention
Aiming at the problems, the invention provides a multi-cylinder sequential telescopic hydraulic system and a control method, which have the advantages of exquisite and reasonable structure, small pressure loss, stable performance and simple and convenient control and maintenance.
The technical scheme of the invention is as follows: a multi-cylinder sequential telescopic hydraulic control system comprises a primary cylinder, a secondary cylinder, a stroke valve assembly and a hydraulic control reversing valve assembly;
a primary cylinder piston rod of the primary oil cylinder is fixedly connected with the basic arm;
a secondary cylinder piston rod and a first telescopic arm of the secondary oil cylinder are respectively and fixedly connected with a primary cylinder barrel of the primary oil cylinder;
a second cylinder barrel of the second-stage oil cylinder is fixedly connected with a second telescopic arm;
the first-stage cylinder center rod is a hollow pipe body with one closed end, one end of the first-stage cylinder center rod is fixedly connected to the cylinder bottom of the first-stage cylinder barrel in a sealing mode, and the other end of the first-stage cylinder center rod is arranged in the first-stage cylinder piston rod in a sliding sealing mode;
a sealing cavity matched with the center rod of the primary cylinder is arranged on the piston rod of the primary cylinder;
the first-stage cylinder piston rod is provided with an oil duct a and an oil duct b;
an oil duct f is arranged on a primary cylinder piston of the primary oil cylinder;
the cylinder bottom of the first-stage cylinder barrel is provided with an oil duct c and an oil duct d;
the oil duct a communicates the end part of the piston rod of the primary cylinder with the rod cavity of the primary cylinder;
the oil passage b extends from the end part of the primary cylinder piston rod into the primary cylinder center rod and is communicated with the oil passage d;
one end of the oil duct d is communicated with the first-stage cylinder center rod, and the other end of the oil duct d is connected with the stroke valve assembly;
one end of the oil duct c is communicated with the rodless cavity of the primary cylinder, and the other end of the oil duct c is connected with the stroke valve assembly;
the bottom of the secondary cylinder barrel is provided with a collision block matched with the stroke valve assembly, and the stroke valve assembly is reversed through the collision block;
one end of the oil duct f is communicated with the rodless cavity of the primary cylinder, and the other end of the oil duct f extends to the side face of the piston rod of the primary cylinder;
an oil duct j and an oil duct k are arranged on the piston rod of the secondary cylinder;
one end of the oil duct j is communicated with the rod cavity of the secondary cylinder, and the other end of the oil duct j is connected with the hydraulic control reversing valve assembly; the hydraulic control reversing valve assembly is communicated with the rod cavity of the primary cylinder through an oil duct i;
one end of the oil duct k is communicated with the rodless cavity of the secondary cylinder, and the other end of the oil duct k is communicated with the oil duct d through the hydraulic control reversing valve assembly;
and the rod cavity of the primary cylinder is also provided with an oil duct h connected with the hydraulic control reversing valve assembly.
The stroke valve assembly comprises a first one-way valve and a stroke valve;
an oil inlet of the first one-way valve is communicated with the oil duct d, and an oil outlet of the first one-way valve is communicated with the oil duct c;
and a first main oil inlet and outlet of the stroke valve is communicated with the oil duct c, and a second main oil inlet and outlet of the stroke valve is communicated with the oil duct d.
The hydraulic control reversing valve assembly comprises a second one-way valve and a normally closed hydraulic control reversing valve;
an oil inlet of the second one-way valve is communicated with the oil duct k, and an oil outlet of the second one-way valve is communicated with the oil duct d through an oil duct e;
a first main oil inlet and outlet of the normally closed hydraulic control reversing valve is communicated with the oil duct e through an oil duct g;
a second main oil inlet and outlet of the normally closed hydraulic control reversing valve is communicated with the oil duct k;
a resetting oil port of the normally closed hydraulic control reversing valve is communicated with the oil duct i;
and a hydraulic control oil port of the normally closed hydraulic control reversing valve is communicated with the rod cavity of the primary cylinder through the oil duct h.
The hydraulic control reversing valve assembly is a normally open hydraulic control reversing valve;
the main oil inlet and outlet tee of the normally open hydraulic control reversing valve is communicated with the oil duct d through an oil duct e;
a main oil inlet and outlet four-way oil passage k of the normally open hydraulic control reversing valve is communicated with the rodless cavity of the secondary cylinder;
a reset oil port of the normally open hydraulic control reversing valve is communicated with the rod cavity of the primary cylinder through an oil duct h;
and a hydraulic control oil port of the normally open hydraulic control reversing valve is communicated with the oil duct e through an oil duct g.
A control method of a multi-cylinder sequential telescopic hydraulic system comprises the following steps:
1) and the first-stage cylinder barrel extends out:
hydraulic oil enters the oil duct b and enters the rodless cavity of the primary cylinder through the oil duct d, the first one-way valve and the oil duct c; due to the limitation of the hydraulic control reversing valve assembly, hydraulic oil cannot enter the rodless cavity of the secondary cylinder; the first-stage cylinder barrel drives the first telescopic arm to extend out, and meanwhile, the second-stage cylinder is connected with the first-stage cylinder barrel and the second telescopic arm, so that the second telescopic arm and the second-stage cylinder are driven to extend out together;
2) and extending the cylinder barrel of the secondary cylinder:
when the primary oil cylinder is completely extended out, the oil duct f on the primary cylinder piston is communicated with the oil duct h on the primary cylinder barrel, and the hydraulic control reversing valve is pushed, so that hydraulic oil sequentially passes through the oil duct e, the oil duct g and the oil duct k and enters the rodless cavity of the secondary cylinder, namely the secondary cylinder barrel drives the secondary arm to extend out;
3) and retracting the cylinder barrel of the second-stage cylinder:
hydraulic oil enters a rod cavity of the primary cylinder through an oil duct a and then enters a rod cavity of the secondary cylinder through an oil duct i and an oil duct j, the hydraulic oil in the rodless cavity of the primary cylinder is sealed and cannot return oil under the action of the first check valve and the stroke valve, and a cylinder barrel of the secondary cylinder retracts firstly;
4) and retracting the cylinder barrel of the primary cylinder:
when the secondary cylinder retracts completely, the collision block on the cylinder barrel of the secondary cylinder impacts the ejector rod of the upper stroke valve at the bottom of the primary cylinder to trigger the oil circuit of the rodless cavity of the primary cylinder to open, so that hydraulic oil in the rodless cavity of the primary cylinder returns, and the retraction of the cylinder barrel of the primary cylinder is finished.
The hydraulic control reversing valve comprises a primary oil cylinder, a secondary oil cylinder, a stroke valve assembly and a hydraulic control reversing valve assembly; a primary cylinder piston rod of the primary oil cylinder is fixedly connected with the basic arm; a second-stage cylinder piston rod and a first telescopic arm of the second-stage oil cylinder are respectively and fixedly connected with a first-stage cylinder barrel of the first-stage oil cylinder; a second cylinder barrel of the second-stage oil cylinder is fixedly connected with the second telescopic arm; the first-stage cylinder center rod is a hollow pipe body with one end sealed, one end is fixedly connected to the bottom of the first-stage cylinder barrel in a sealing mode, and the other end is arranged in the first-stage cylinder piston rod in a sliding sealing mode. Hydraulic oil enters the oil duct b and enters the rodless cavity of the primary cylinder through the oil duct d, the first one-way valve and the oil duct c; due to the limitation of the hydraulic control reversing valve assembly, hydraulic oil cannot enter the rodless cavity of the secondary cylinder; the first-stage cylinder barrel drives the first telescopic arm, the second telescopic arm and the second-stage cylinder to extend out; when the primary oil cylinder is completely extended out, the oil duct f on the primary cylinder piston is communicated with the oil duct h on the primary cylinder barrel, the hydraulic control reversing valve is pushed, and hydraulic oil sequentially passes through the oil duct e, the oil duct g and the oil duct k and enters the rodless cavity of the secondary cylinder, namely the secondary cylinder barrel drives the secondary arm to extend out. The invention has the characteristics of exquisite and reasonable structure, small pressure loss, stable performance, simple and convenient control and maintenance and the like.
Drawings
Figure 1 is a schematic view of the structure of the present invention,
figure 2 is a schematic cross-sectional perspective view of the present invention,
figure 3 is a hydraulic schematic structure diagram of a normally closed hydraulic control reversing valve of the embodiment,
fig. 4 is a schematic diagram showing the flow direction of hydraulic oil when the primary cylinder tube is extended (the direction of the arrow in the figure is the flow direction of hydraulic oil),
figure 5 is a schematic diagram showing the flow of hydraulic oil when the secondary cylinder bore is extended (the direction of the arrows in the figure is the flow of hydraulic oil),
FIG. 6 is a hydraulic control schematic of a second embodiment normally open hydraulically controlled reversing valve;
in the figure, 1 is a primary cylinder piston rod, 2 is a primary cylinder barrel, 3 is a primary cylinder center rod, 4 is a ram, 5 is a first check valve, 6 is a stroke valve, 7 is a secondary cylinder barrel, 8 is a second check valve, 91 is a normally closed pilot operated directional control valve, 92 is a normally open pilot operated directional control valve, and 10 is a secondary cylinder piston rod.
Detailed Description
Example one
This embodiment is illustrated in fig. 1-5, where a represents an oil passage a, b represents an oil passage b, c represents an oil passage c, d represents an oil passage d, e represents an oil passage e, f represents an oil passage f, g represents an oil passage g, h represents an oil passage h, i represents an oil passage i, j represents an oil passage j, and k represents an oil passage k.
The hydraulic control reversing valve assembly comprises a primary oil cylinder, a secondary oil cylinder, a stroke valve assembly and a hydraulic control reversing valve assembly;
a primary cylinder piston rod 1 of the primary oil cylinder is fixedly connected with the basic arm;
a secondary cylinder piston rod 10 and a first telescopic arm of the secondary oil cylinder are respectively and fixedly connected with a primary cylinder barrel 2 of the primary oil cylinder;
a secondary cylinder barrel 7 of the secondary oil cylinder is fixedly connected with the second telescopic arm;
the first-stage cylinder center rod 3 is a hollow pipe body with one closed end, one end of the first-stage cylinder center rod is fixedly connected to the cylinder bottom of the first-stage cylinder barrel 2 in a sealing mode, and the other end of the first-stage cylinder center rod is arranged in the first-stage cylinder piston rod 1 in a sliding sealing mode;
a sealing cavity matched with the first-stage cylinder center rod 3 is arranged on the first-stage cylinder piston rod 1; the primary cylinder piston rod 1 is connected on the primary cylinder center rod 33 in a sliding and sealing manner, so that the sealing property of the oil duct b is ensured;
the first-stage cylinder piston rod 1 is provided with an oil duct a and an oil duct b;
an oil duct f is arranged on a primary cylinder piston of the primary oil cylinder;
the cylinder bottom of the first-stage cylinder barrel 2 is provided with an oil duct c and an oil duct d;
the oil duct a communicates the end part of the primary cylinder piston rod 1 with a primary cylinder rod cavity;
the oil passage b extends from the end part of the primary cylinder piston rod 1 to the inside of the primary cylinder center rod 3 and is communicated with the oil passage d;
one end of the oil duct d is communicated with the first-stage cylinder center rod 3, and the other end of the oil duct d is connected with the stroke valve assembly;
one end of the oil duct c is communicated with the rodless cavity of the primary cylinder, and the other end of the oil duct c is connected with the stroke valve assembly;
the bottom of the secondary cylinder barrel 7 is provided with a collision block 4 matched with the stroke valve assembly, and the stroke valve assembly is reversed through the collision block 4;
one end of the oil duct f is communicated with the rodless cavity of the primary cylinder, and the other end of the oil duct f extends to the side face of the piston rod 1 of the primary cylinder;
the secondary cylinder piston rod 10 is provided with an oil passage j and an oil passage k;
one end of the oil duct j is communicated with the rod cavity of the secondary cylinder, and the other end of the oil duct j is connected with the hydraulic control reversing valve assembly; the hydraulic control reversing valve assembly is communicated with the rod cavity of the primary cylinder through an oil duct i;
one end of the oil duct k is communicated with the rodless cavity of the secondary cylinder, and the other end of the oil duct k is communicated with the oil duct d through the hydraulic control reversing valve assembly;
and the rod cavity of the primary cylinder is also provided with an oil duct h connected with the hydraulic control reversing valve assembly.
The stroke valve assembly comprises a first one-way valve 5 and a stroke valve 6;
an oil inlet of the first one-way valve 5 is communicated with the oil duct d, and an oil outlet of the first one-way valve is communicated with the oil duct c;
and a first main oil inlet and outlet of the stroke valve 6 is communicated with the oil duct c, and a second main oil inlet and outlet of the stroke valve 6 is communicated with the oil duct d.
The hydraulic control reversing valve assembly comprises a second one-way valve 8 and a normally closed hydraulic control reversing valve 91;
an oil inlet of the second one-way valve 8 is communicated with the oil passage k, and an oil outlet of the second one-way valve is communicated with the oil passage d through an oil passage e;
a first main oil inlet and outlet of the normally closed hydraulic control reversing valve 91 is communicated with the oil duct e through an oil duct g;
a second main oil inlet and outlet of the normally closed hydraulic control reversing valve 91 is communicated with the oil duct k;
a resetting oil port of the normally closed hydraulic control reversing valve 91 is communicated with the oil duct i;
and a hydraulic control oil port of the normally closed hydraulic control reversing valve 91 is communicated with the rod cavity of the primary cylinder through the oil duct h.
A control method of a multi-cylinder sequential telescopic hydraulic system comprises the following steps:
1) the first-stage cylinder barrel 2 extends out:
hydraulic oil enters the oil passage b and enters the rodless cavity of the primary cylinder through the oil passage d, the first one-way valve 5 and the oil passage c; due to the limitation of the hydraulic control reversing valve assembly, hydraulic oil cannot enter the rodless cavity of the secondary cylinder; the first-stage cylinder barrel 2 drives the first telescopic arm to extend out, and meanwhile, the second-stage cylinder is connected with the first-stage cylinder barrel 2 and the second telescopic arm, so that the second telescopic arm and the second-stage cylinder are driven to extend out together;
2) and the second-stage cylinder barrel 7 extends out:
when the primary oil cylinder is completely extended out, the oil duct f on the primary cylinder piston is communicated with the oil duct h on the primary cylinder barrel 2, and the hydraulic control reversing valve is pushed, so that hydraulic oil sequentially passes through the oil duct e, the oil duct g and the oil duct k and enters a rodless cavity of the secondary cylinder, namely the secondary cylinder barrel 7 drives the secondary arm to extend out;
3) and the second-stage cylinder barrel 7 retracts:
hydraulic oil enters a rod cavity of the primary cylinder through an oil duct a and then enters a rod cavity of the secondary cylinder through an oil duct i and an oil duct j, the hydraulic oil in the rodless cavity of the primary cylinder is sealed and cannot return oil under the action of a first check valve 5 and a stroke valve 6 on the primary cylinder, and a cylinder barrel 7 of the secondary cylinder retracts firstly;
4) first-stage cylinder barrel 2 retracts:
when the secondary cylinder retracts completely, the collision block 4 on the cylinder barrel 7 of the secondary cylinder impacts the ejector rod of the upper stroke valve 6 at the bottom of the primary cylinder to trigger the oil circuit of the rodless cavity of the primary cylinder to open, so that hydraulic oil in the rodless cavity of the primary cylinder returns, and the retraction of the cylinder barrel 2 of the primary cylinder is finished.
Example two
In the embodiment shown in fig. 6, the pilot operated directional control valve assembly is a normally open pilot operated directional control valve 92;
the main oil inlet and outlet three-way of the normally open hydraulic control directional valve 92 is communicated with the oil duct d through an oil duct e;
the main oil inlet and outlet four-way oil passage k of the normally open hydraulic control reversing valve 92 is communicated with the rodless cavity of the secondary cylinder;
a reset oil port of the normally open hydraulic control reversing valve 92 is communicated with the rod cavity of the primary cylinder through an oil duct h;
and a hydraulic control oil port of the normally open hydraulic control reversing valve 92 is communicated with the oil duct e through an oil duct g.
The difference between the first embodiment and the second embodiment in this case is that, as shown in fig. 3, the hydraulic control directional control valve is a normally closed hydraulic control directional control valve 91, and the oil path of the normally closed hydraulic control directional control valve 91 is opened when the first-stage cylinder piston rod 1 moves to the end (i.e., the oil path f is communicated with the oil path h); because the normally closed hydraulic control directional control valve 91 is in a normally closed state, the one-way valve 8 is arranged on the bypass, so that the hydraulic oil in the rodless cavity of the secondary cylinder can return oil through the oil duct k, the oil duct e of the second one-way valve 8, the oil duct d and the oil duct b.
As shown in fig. 6, in the second embodiment, a normally open hydraulic control directional control valve 92 is provided, when the primary cylinder extends out, a hydraulic control port of the hydraulic control directional control valve is connected with the oil inlet passage through oil passages e, d and b, and the hydraulic control directional control valve works at the right position under the action of oil inlet pressure, so that hydraulic oil cannot enter a rod cavity of the secondary cylinder; at the tail end of the stroke of the primary cylinder, the oil duct f is communicated with the oil duct h, the pressure of a hydraulic control port of the hydraulic control reversing valve is the same as that of a spring cavity port, the hydraulic control reversing valve works in the left position under the action of the elastic force of the spring, the oil duct e is communicated with the oil duct k through the hydraulic control reversing valve, hydraulic oil enters a rodless cavity of the secondary cylinder, and the secondary cylinder extends out; retracting a secondary cylinder: hydraulic oil enters a cavity of the second-stage cylinder through oil ducts a, i and j, and the hydraulic oil in the rodless cavity of the second-stage cylinder returns through an oil duct k, a normally open hydraulic control reversing valve 92 (the hydraulic control reversing valve works at the left position), an oil duct e, an oil duct d and an oil duct b, so that the retraction of the second-stage cylinder is realized;
in fig. 6, the control of the extension sequence of the secondary cylinder is affected by the pressure difference between the rodless chamber and the rod chamber when the primary cylinder extends, and the greater the difference, the better the sequence effect.
The disclosure of the present application also includes the following points:
(1) the drawings of the embodiments disclosed herein only relate to the structures related to the embodiments disclosed herein, and other structures can refer to general designs;
(2) in case of conflict, the embodiments and features of the embodiments disclosed in this application can be combined with each other to arrive at new embodiments;
the above embodiments are only embodiments disclosed in the present disclosure, but the scope of the disclosure is not limited thereto, and the scope of the disclosure should be determined by the scope of the claims.
Claims (5)
1. A multi-cylinder sequential telescopic hydraulic control system is characterized by comprising a primary cylinder, a secondary cylinder, a stroke valve assembly and a hydraulic control reversing valve assembly;
a primary cylinder piston rod of the primary oil cylinder is fixedly connected with the basic arm;
a secondary cylinder piston rod and a first telescopic arm of the secondary oil cylinder are respectively and fixedly connected with a primary cylinder barrel of the primary oil cylinder;
a second cylinder barrel of the second-stage oil cylinder is fixedly connected with a second telescopic arm;
the first-stage cylinder center rod is a hollow pipe body with one closed end, one end of the first-stage cylinder center rod is fixedly connected to the cylinder bottom of the first-stage cylinder barrel in a sealing mode, and the other end of the first-stage cylinder center rod is arranged in the first-stage cylinder piston rod in a sliding sealing mode;
a sealing cavity matched with the center rod of the primary cylinder is arranged on the piston rod of the primary cylinder;
the first-stage cylinder piston rod is provided with an oil duct a and an oil duct b;
an oil duct f is arranged on a primary cylinder piston of the primary oil cylinder;
the cylinder bottom of the first-stage cylinder barrel is provided with an oil duct c and an oil duct d;
the oil duct a communicates the end part of the piston rod of the primary cylinder with the rod cavity of the primary cylinder;
the oil passage b extends from the end part of the primary cylinder piston rod into the primary cylinder center rod and is communicated with the oil passage d;
one end of the oil duct d is communicated with the first-stage cylinder center rod, and the other end of the oil duct d is connected with the stroke valve assembly;
one end of the oil duct c is communicated with the rodless cavity of the primary cylinder, and the other end of the oil duct c is connected with the stroke valve assembly;
the bottom of the secondary cylinder barrel is provided with a collision block matched with the stroke valve assembly, and the stroke valve assembly is reversed through the collision block;
one end of the oil duct f is communicated with the rodless cavity of the primary cylinder, and the other end of the oil duct f extends to the side face of the piston rod of the primary cylinder;
an oil duct j and an oil duct k are arranged on the piston rod of the secondary cylinder;
one end of the oil duct j is communicated with the rod cavity of the secondary cylinder, and the other end of the oil duct j is connected with the hydraulic control reversing valve assembly; the hydraulic control reversing valve assembly is communicated with the rod cavity of the primary cylinder through an oil duct i;
one end of the oil duct k is communicated with the rodless cavity of the secondary cylinder, and the other end of the oil duct k is communicated with the oil duct d through the hydraulic control reversing valve assembly;
and the rod cavity of the primary cylinder is also provided with an oil duct h connected with the hydraulic control reversing valve assembly.
2. The multi-cylinder sequential telescoping hydraulic control system of claim 1, wherein said travel valve assembly includes a first one-way valve and a travel valve;
an oil inlet of the first one-way valve is communicated with the oil duct d, and an oil outlet of the first one-way valve is communicated with the oil duct c;
and a first main oil inlet and outlet of the stroke valve is communicated with the oil duct c, and a second main oil inlet and outlet of the stroke valve is communicated with the oil duct d.
3. The multi-cylinder sequential telescoping hydraulic control system of claim 1, wherein said pilot operated directional valve assembly includes a second check valve and a normally closed pilot operated directional valve;
an oil inlet of the second one-way valve is communicated with the oil duct k, and an oil outlet of the second one-way valve is communicated with the oil duct d through an oil duct e;
a first main oil inlet and outlet of the normally closed hydraulic control reversing valve is communicated with the oil duct e through an oil duct g;
a second main oil inlet and outlet of the normally closed hydraulic control reversing valve is communicated with the oil duct k;
a resetting oil port of the normally closed hydraulic control reversing valve is communicated with the oil duct i;
and a hydraulic control oil port of the normally closed hydraulic control reversing valve is communicated with the rod cavity of the primary cylinder through the oil duct h.
4. The multi-cylinder sequential telescoping hydraulic control system of claim 1, wherein said hydraulic control directional valve assembly is a normally open hydraulic control directional valve;
the main oil inlet and outlet tee of the normally open hydraulic control reversing valve is communicated with the oil duct d through an oil duct e;
a main oil inlet and outlet four-way oil passage k of the normally open hydraulic control reversing valve is communicated with the rodless cavity of the secondary cylinder;
a reset oil port of the normally open hydraulic control reversing valve is communicated with the rod cavity of the primary cylinder through an oil duct h;
and a hydraulic control oil port of the normally open hydraulic control reversing valve is communicated with the oil duct e through an oil duct g.
5. A control method of a multi-cylinder sequential telescopic hydraulic system is characterized by comprising the following steps:
1) and the first-stage cylinder barrel extends out:
hydraulic oil enters the oil duct b and enters the rodless cavity of the primary cylinder through the oil duct d, the first one-way valve and the oil duct c; due to the limitation of the hydraulic control reversing valve assembly, hydraulic oil cannot enter the rodless cavity of the secondary cylinder; the first-stage cylinder barrel drives the first telescopic arm to extend out, and meanwhile, the second-stage cylinder is connected with the first-stage cylinder barrel and the second telescopic arm, so that the second telescopic arm and the second-stage cylinder are driven to extend out together;
2) and extending the cylinder barrel of the secondary cylinder:
when the primary oil cylinder is completely extended out, the oil duct f on the primary cylinder piston is communicated with the oil duct h on the primary cylinder barrel, and the hydraulic control reversing valve is pushed, so that hydraulic oil sequentially passes through the oil duct e, the oil duct g and the oil duct k and enters the rodless cavity of the secondary cylinder, namely the secondary cylinder barrel drives the secondary arm to extend out;
3) and retracting the cylinder barrel of the second-stage cylinder:
hydraulic oil enters a rod cavity of the primary cylinder through an oil duct a and then enters a rod cavity of the secondary cylinder through an oil duct i and an oil duct j, the hydraulic oil in the rodless cavity of the primary cylinder is sealed and cannot return oil under the action of the first check valve and the stroke valve, and a cylinder barrel of the secondary cylinder retracts firstly;
4) and retracting the cylinder barrel of the primary cylinder:
when the secondary cylinder retracts completely, the collision block on the cylinder barrel of the secondary cylinder impacts the ejector rod of the upper stroke valve at the bottom of the primary cylinder to trigger the oil circuit of the rodless cavity of the primary cylinder to open, so that hydraulic oil in the rodless cavity of the primary cylinder returns, and the retraction of the cylinder barrel of the primary cylinder is finished.
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| CN114294297A (en) * | 2021-12-29 | 2022-04-08 | 广东南曦液压机械有限公司 | Sequential telescopic oil cylinder system, control method and equipment thereof |
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