CN212127338U - Multi-oil-cylinder sequential telescopic hydraulic control system - Google Patents
Multi-oil-cylinder sequential telescopic hydraulic control system Download PDFInfo
- Publication number
- CN212127338U CN212127338U CN202020785629.2U CN202020785629U CN212127338U CN 212127338 U CN212127338 U CN 212127338U CN 202020785629 U CN202020785629 U CN 202020785629U CN 212127338 U CN212127338 U CN 212127338U
- Authority
- CN
- China
- Prior art keywords
- oil
- cylinder
- oil duct
- hydraulic control
- communicated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Actuator (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A multi-oil-cylinder sequential telescopic hydraulic control system. 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 utility model has the characteristics of the structure is exquisite reasonable, loss of pressure is little, stable performance, control maintain portably etc.
Description
Technical Field
The utility model relates to a flexible hydraulic control system of crane boom especially relates to many hydro-cylinders hydraulic control system that stretches out and draws back in proper order.
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 existing patent document, as a space name "hydraulic sequential telescopic mechanism and engineering machinery" issued by the national intellectual property office 2014, 6, month 11, the utility model patent with the application number of 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 name of a sequential hydraulic cylinder group is published as 'a sequential hydraulic cylinder group' in the publication issued by the national intellectual property office 2017, 12, month 22 and 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, a utility model patent with the title "a multi-cylinder sequential telescopic mechanism and a construction machine" issued by 6, month and 12 days in 2018 and the application number "201610143635.6" is disclosed. 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.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to above problem, provide a structure exquisiteness reasonable, loss of pressure is little, stable performance, control maintain simple and convenient many hydro-cylinders hydraulic control system that stretches out and draws back in order.
The technical scheme of the utility model is that: the multi-oil-cylinder sequential telescopic hydraulic control system 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 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.
The utility model 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 utility model has the characteristics of the structure is exquisite reasonable, loss of pressure is little, stable performance, control maintain portably etc.
Drawings
Figure 1 is a schematic structural view of the present invention,
figure 2 is a schematic sectional three-dimensional structure 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 with the primary cylinder center rod 3 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.
The control method of the multi-cylinder sequential telescopic hydraulic control 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 (4)
1. The multi-oil-cylinder sequential telescopic hydraulic control system is characterized by comprising 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 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 one-way 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020785629.2U CN212127338U (en) | 2020-05-12 | 2020-05-12 | Multi-oil-cylinder sequential telescopic hydraulic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020785629.2U CN212127338U (en) | 2020-05-12 | 2020-05-12 | Multi-oil-cylinder sequential telescopic hydraulic control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212127338U true CN212127338U (en) | 2020-12-11 |
Family
ID=73694105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020785629.2U Active CN212127338U (en) | 2020-05-12 | 2020-05-12 | Multi-oil-cylinder sequential telescopic hydraulic control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212127338U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111439690A (en) * | 2020-05-12 | 2020-07-24 | 江苏宏昌天马物流装备有限公司 | Multi-oil-cylinder sequential telescopic hydraulic system and control method |
-
2020
- 2020-05-12 CN CN202020785629.2U patent/CN212127338U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111439690A (en) * | 2020-05-12 | 2020-07-24 | 江苏宏昌天马物流装备有限公司 | Multi-oil-cylinder sequential telescopic hydraulic system and control method |
| CN111439690B (en) * | 2020-05-12 | 2024-05-24 | 江苏宏昌天马物流装备有限公司 | Multi-cylinder sequential telescopic hydraulic system and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105545853B (en) | Extension and contraction control valve, multi-stage expansion hydraulic system and arm of derrick stretch hydraulic control system | |
| CN103896155A (en) | Hydraulic control system for controlling double cylinders to telescope sequentially, suspension arm mechanism and crane | |
| CN102518617B (en) | Travel valve, sequential action type combination hydraulic cylinder and hydraulic equipment | |
| CN102619805B (en) | Hydraulic cylinder suitable for controlling plurality of hydraulic cylinders to extend sequentially | |
| CN103899585A (en) | Hydraulic control system with two oil cylinders performing orderly telescopic motion, suspension arm mechanism and crane | |
| CN203926189U (en) | Hydraulic control system, suspension arm mechanism and the hoist of a kind of pair of oil cylinder sequential telescopic | |
| CN212127338U (en) | Multi-oil-cylinder sequential telescopic hydraulic control system | |
| CN109973463A (en) | A kind of oil cylinder, Multi-cylinder sequential telescopic mechanism and engineering machinery that energy reliable sequence is flexible | |
| CN111439690B (en) | Multi-cylinder sequential telescopic hydraulic system and control method | |
| CN112320635B (en) | Piston rod of telescopic oil cylinder, telescopic oil cylinder and crane | |
| CN207715463U (en) | A kind of sequential telescopic oil cylinder and crane | |
| CN105384091A (en) | Telescopic boom structure with a multilevel independent telescopic cylinder and crane | |
| CN210355758U (en) | Multi-oil-cylinder sequential telescopic mechanism and elevating fire truck using same | |
| CN203715094U (en) | Hydraulic control system for controlling sequential expansion of double cylinders, suspension arm mechanism and crane | |
| CN210949337U (en) | Automatic high-low pressure switching hydraulic system and equipment applying same | |
| CN103057526B (en) | Hydraulic system for controlling synchronous support of multiple support legs and engineering vehicle | |
| CN216642650U (en) | Oil cylinder structure and multi-stage oil cylinder device thereof | |
| CN103030065B (en) | Hydraulic locking control system, hydraulic assembly of crane, and crane | |
| CN212272674U (en) | Double-valve-core full-hydraulic-control integrated pumping reversing system | |
| CN114294297A (en) | Sequential telescopic oil cylinder system, control method and equipment thereof | |
| CN212532094U (en) | Sequential telescopic oil cylinder for crane | |
| CN111779721A (en) | Sequential telescopic oil cylinder and combination thereof | |
| CN202520687U (en) | Hydraulic cylinder suitable for controlling sequential extension movement of multiple hydraulic cylinders | |
| CN112797043B (en) | Sequential telescopic cylinder, multi-cylinder sequential telescopic mechanism and crane | |
| CN214788320U (en) | Multi-stroke oil cylinder device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |