CN104591011A - Crane jib switching valve, hydraulic control system and engineering machinery - Google Patents

Crane jib switching valve, hydraulic control system and engineering machinery Download PDF

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Publication number
CN104591011A
CN104591011A CN201310531153.4A CN201310531153A CN104591011A CN 104591011 A CN104591011 A CN 104591011A CN 201310531153 A CN201310531153 A CN 201310531153A CN 104591011 A CN104591011 A CN 104591011A
Authority
CN
China
Prior art keywords
valve
actuating cylinder
hydraulic actuating
circuit
oil
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.)
Pending
Application number
CN201310531153.4A
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Chinese (zh)
Inventor
徐海东
魏星
党伟
李金灵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beiqi Foton Motor Co Ltd
Original Assignee
Beiqi Foton Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beiqi Foton Motor Co Ltd filed Critical Beiqi Foton Motor Co Ltd
Priority to CN201310531153.4A priority Critical patent/CN104591011A/en
Publication of CN104591011A publication Critical patent/CN104591011A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00Cranes 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
    • B66C23/62Constructional features or details
    • B66C23/64Jibs
    • B66C23/70Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/25Pressure control functions

Abstract

The invention relates to the technical field of engineering machinery, and especially relates to a crane jib switching valve, a hydraulic control system equipped with the crane jib switching valve and engineering machinery, and concretely relates to the crane jib switching valve used for telescoping a crane jib. According to the invention, a shunting loop and an oil supplement loop are connected to the crane jib switching valve in a switching loop, various valves in the switching loop, the shunting loop and the oil supplement loop are integrated and arranged, switching of a first hydraulic cylinder and a second hydraulic cylinder can be controlled through electric control; when the first hydraulic cylinder is retracted, oil fluid in a first rod core and a second rod core enables backflow by the shunting loop, generation of moving phenomenon of a second jib can be effectively avoided; when the first hydraulic cylinder is extended, oil liquid supplement is carried out to the first rod core and the second rod core by the oil supplement loop, empty oil cylinder can be avoided, time-delay phenomenon of the second jib can be effectively avoided, work efficiency is increased, a structure of the whole crane jib switching valve is compact, and the installation and operation are convenient.

Description

Arm transfer valve, hydraulic control system and construction machinery and equipment
Technical field
The present invention relates to technical field of engineering machinery, particularly relate to a kind of arm transfer valve and be provided with hydraulic control system and the construction machinery and equipment of this arm transfer valve, a kind of arm transfer valve being applicable to crane hoisting arm expansion specifically.
Background technology
The flexible of crane arm controls by hydraulic control system.The telescopic oil cylinder switched system of wheel crane is in the market the switching adopting the action of two or more change-over valve integrating control telescopic oil cylinder; it is larger that telescopic oil cylinder switches Oil shocking; and oil cylinder is when flexible; what often there will be the time delay phenomenon of stretching out second section arm and contracting second section arm alters arm phenomenon; affect the operating cycles of work efficiency and element, make whole flexible loop service efficiency on the low side.
Therefore, for above deficiency, need to provide and be a kind ofly applicable to the arm transfer valve of crane hoisting arm expansion and be provided with hydraulic control system and the construction machinery and equipment of this arm transfer valve.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention solves the switching that existing telescopic oil cylinder switched system adopts the action of two or more change-over valve integrating control telescopic oil cylinder, it is larger that telescopic oil cylinder switches Oil shocking, and the time delay phenomenon of stretching out second section arm that occurs when flexible of oil cylinder and second section arm alter arm phenomenon, the problem that whole hydraulic circuit service efficiency is low.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of arm transfer valve, this arm transfer valve comprises:
For controlling the switching circuit that the first hydraulic actuating cylinder and the second hydraulic actuating cylinder carry out stretching;
When described first hydraulic actuating cylinder stretches out, for carrying out the feed circuit of repairing to the first bar core of described first hydraulic actuating cylinder and the second bar core of described second hydraulic actuating cylinder;
When described first hydraulic actuating cylinder bounces back, for the shunting circuit that the fluid in the first bar core of described first hydraulic actuating cylinder and the second bar core of described second hydraulic actuating cylinder is carried out refluxing;
Described shunting circuit and feed circuit are all connected with described switching circuit.
Further, described switching circuit comprises the first oil circuit and the second oil circuit, one end of described first oil circuit connects main valve, the other end connects the first plug-in mounting check valve and the second plug-in mounting check valve, described first plug-in mounting check valve is also communicated with by first rodless cavity of pipeline with described first hydraulic actuating cylinder, described second plug-in mounting check valve is also communicated with second rodless cavity of the second bar core with described second hydraulic actuating cylinder by described first bar core, and described first plug-in mounting check valve and the second plug-in mounting check valve switch between opening and closed condition; First rod chamber of described first hydraulic actuating cylinder is communicated with the second rod chamber of described second hydraulic actuating cylinder, and described first rod chamber is connected with described main valve by described second oil circuit.
Further, also comprise main reversing valve, described main reversing valve is for controlling the open and close of described first plug-in mounting check valve and the second plug-in mounting check valve.
Further, also shuttle valve is provided with between the oil circuit control that described first oil circuit and the second oil circuit are drawn, described main reversing valve is connected with described shuttle valve, and described first oil circuit realizes being connected with described main reversing valve respectively by described shuttle valve by the switching of oil pressure with the second oil circuit.
Further, described shunting circuit is arranged between described second rodless cavity and fuel tank.
Further, described shunting circuit comprises solenoid directional control valve, and described solenoid directional control valve is between described second rodless cavity and described fuel tank.
Further, described shunting circuit also comprises dash pot valve, and described dash pot valve is arranged between described second rodless cavity and described solenoid directional control valve.
Further, described feed circuit comprises check valve, and described check valve is arranged between described second rodless cavity and described fuel tank.
Present invention also offers a kind of hydraulic control system, this hydraulic control system comprises above-mentioned arm transfer valve.
Present invention also offers a kind of construction machinery and equipment, this project machinery also comprises above-mentioned hydraulic control system.
(3) beneficial effect
Technique scheme tool of the present invention has the following advantages: arm transfer valve of the present invention is connected with shunting circuit and feed circuit in switching circuit, by integrated layouts such as the various valves in switching circuit, shunting circuit and feed circuit, by the automatically controlled switching controlling the first hydraulic actuating cylinder and the second hydraulic actuating cylinder; When the first hydraulic actuating cylinder bounces back, the fluid in the first bar core and the second bar core can be refluxed by shunting circuit, effectively avoid the generation of altering arm phenomenon of contracting second section arm; When the first hydraulic actuating cylinder stretches out, fluid can be carried out to the first bar core and the second bar core by feed circuit to supplement, avoid oil cylinder to inhale empty, effectively avoid the generation of stretching out second section arm time delay phenomenon, improve work efficiency, and the compact conformation of whole arm transfer valve, fitting operation are convenient.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of embodiment of the present invention hydraulic control system.
In figure: 1: main reversing valve; 2: solenoid directional control valve; 3: the first plug-in mounting check valves; 4: the second plug-in mounting check valves; 5: check valve; 6: shuttle valve; 7: dash pot valve; 8: the first hydraulic actuating cylinders; 9: the second hydraulic actuating cylinders; 10: the first rodless cavities; 11: the second rodless cavities; 12: the first rod chambers; 13: the second rod chambers; 14: main valve; 15: the first bar cores; 16: the second bar cores; A: the first oil circuit; B: the second oil circuit; T: fuel tank.
Detailed description of the invention
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
As shown in Figure 1, a kind of arm transfer valve that the embodiment of the present invention provides, this arm transfer valve comprises switching circuit, shunting circuit and feed circuit, and described shunting circuit and feed circuit are all connected with described switching circuit.
Particularly, switching circuit is for controlling the first hydraulic actuating cylinder 8 and the second hydraulic actuating cylinder 9 stretches; When described first hydraulic actuating cylinder 8 stretches out, feed circuit is used for carrying out repairing to the first bar core 15 of described first hydraulic actuating cylinder 8 and the second bar core 16 of described second hydraulic actuating cylinder 9; When described first hydraulic actuating cylinder 8 bounces back, shunting circuit is for refluxing the fluid in the second bar core 16 of the first bar core 15 of described first hydraulic actuating cylinder 8 and described second hydraulic actuating cylinder 9.
Repairing can be carried out to the second bar core 16 of the first bar core 15 of the first hydraulic actuating cylinder 8 and the second hydraulic actuating cylinder 9 by feed circuit, effectively avoid time delay phenomenon during semi-girder to produce; Shunting action can be played to the fluid of the first bar core 15 and the second bar core 16 when the first hydraulic actuating cylinder 8 snapback by shunting circuit, effectively avoid the arm phenomenon of altering during contracting arm to produce, improve the switching efficiency of hoisting arm expansion.
More specifically, described switching circuit comprises main reversing valve 1, first oil circuit A and the second oil circuit B, one end of described first oil circuit A connects main valve 14, the other end connects the first plug-in mounting check valve 3 and the second plug-in mounting check valve 4, described first plug-in mounting check valve 3 is also communicated with by first rodless cavity 10 of pipeline with described first hydraulic actuating cylinder 8, described second plug-in mounting check valve 4 is also communicated with second rodless cavity 11 of the second bar core 16 with described second hydraulic actuating cylinder 9 by described first bar core 15, described main reversing valve 1 is for controlling the open and close of described first plug-in mounting check valve 3 and the second plug-in mounting check valve 4, namely described first plug-in mounting check valve 3 is controlled by main reversing valve 1 and the second plug-in mounting check valve 4 switches between opening and closed condition, thus control the switching of the first hydraulic actuating cylinder 8 and the second hydraulic actuating cylinder 9 expanding-contracting action further.Described main reversing valve 1 is also communicated with fuel tank T by pipeline, first rod chamber 12 of described first hydraulic actuating cylinder 8 is communicated with the second rod chamber 13 of described second hydraulic actuating cylinder 9, and the first rod chamber 12 of described first hydraulic actuating cylinder 8 is connected with described main valve 14 by described second oil circuit B.
Shuttle valve 6 is also provided with between described first oil circuit A and the second oil circuit B, specifically: between the oil circuit control that described first oil circuit A and the second oil circuit B draws, be also provided with shuttle valve 6, described main reversing valve 1 is connected with described shuttle valve 6, and described first oil circuit A realizes being connected with described main reversing valve 1 respectively by described shuttle valve 6 by the switching of oil pressure with the second oil circuit B.Namely, when the oil pressure of the first oil circuit A is greater than the oil pressure of the second oil circuit B, the first oil circuit A is connected with described main reversing valve 1 by shuttle valve 6; When the oil pressure of the second oil circuit B is greater than the oil pressure of the first oil circuit A, the second oil circuit B is connected with described main reversing valve 1 by shuttle valve 6.
Described shunting circuit is arranged between described second rodless cavity 11 and fuel tank T, preferably, arranges solenoid directional control valve 2 in described shunting circuit, and described solenoid directional control valve 2 is between described second rodless cavity 11 and described fuel tank T.In order to reduce the impact of fluid to oil circuit, more preferably, dash pot valve 7 is provided with between described second rodless cavity 11 and described solenoid directional control valve 2.
Described feed circuit comprises check valve 5, and described check valve 5 is arranged between described second rodless cavity 11 and described fuel tank T.Namely solenoid directional control valve 2 after connecting with dash pot valve 7 again and check valve 5 be connected in parallel between the second rodless cavity 11 and described fuel tank T.
During work, as shown in Figure 1, main valve 14 is communicated with oil sources, when needs first hydraulic actuating cylinder 8 and the second hydraulic actuating cylinder 9 stretch out, the oil pressure of the first oil circuit A is greater than the oil pressure of the second oil circuit B, the spool controlling shuttle valve 6 moves right, first oil circuit A is communicated with main reversing valve 1, simultaneously, the controller of main reversing valve 1 controls the first plug-in mounting check valve 3 and to open and the second plug-in mounting check valve 4 is closed, the fluid of oil sources is made to enter the first rodless cavity 10 from the first oil circuit A by the first plug-in mounting check valve 3, the fluid of the first rod chamber 12 gets back to oil sources by the second oil circuit B, control the first hydraulic actuating cylinder 8 to stretch out, the controller of main reversing valve 1 controls the first plug-in mounting check valve 3 and to cut out and the second plug-in mounting check valve 4 is opened, the fluid of oil sources is made to enter the second rodless cavity 11 from the first oil circuit A by the second plug-in mounting check valve 4, the fluid of the second rod chamber 13, by the second oil circuit B oil return, controls the second hydraulic actuating cylinder 9 and stretches out.
When described first hydraulic actuating cylinder 8 stretches out, oil pressure difference can be formed between the first bar core 15 and fuel tank T, oil pressure in fuel tank T is greater than the oil pressure in the first spool 15, the fluid obtained in fuel tank T by oil pressure official post enters the first bar core 15 by check valve 5, and then enter in the second bar core 16, also namely in the first bar core 15 and the second bar core 16, carry out repairing, can effectively avoid inhaling sky.
Controlled unlatching and the closedown of the first plug-in mounting check valve 3 and the second plug-in mounting check valve 4 by main reversing valve 1, control the fluid entered in the first rodless cavity 10 and the second rodless cavity 11, thus control first hydraulic actuating cylinder 8 and the second hydraulic actuating cylinder 9 stretch.
When needs first hydraulic actuating cylinder 8 and the second hydraulic actuating cylinder 9 bounce back, the fluid of oil sources enters the first rod chamber 12 and the second rod chamber 13 from the second oil circuit B, the oil pressure of the second oil circuit B is greater than the oil pressure of the first oil circuit A, control the spool of shuttle valve 6 to moving to left, second oil circuit B is communicated with main control valve 1, simultaneously, the controller of main reversing valve 1 controls the first plug-in mounting check valve 3 and to open and the second plug-in mounting check valve 4 is closed, fluid in first rodless cavity 10 of the first hydraulic actuating cylinder 8 is got back in fuel tank T by the first plug-in mounting check valve 3, controls the first hydraulic actuating cylinder 8 and bounce back; The controller of main reversing valve 1 controls the first plug-in mounting check valve 3 cut out and the second plug-in mounting check valve 4 is opened, and the fluid in the second rodless cavity 11 of the second hydraulic actuating cylinder 9 is got back in fuel tank T by the second plug-in mounting check valve 4, controls the second hydraulic actuating cylinder 9 and bounce back.
When described first hydraulic actuating cylinder 8 bounces back, fluid in described first bar core 15 and described second bar core 16 carries out being back in fuel tank T by the shunting circuit that solenoid directional control valve 2 and dash pot valve 7 are formed, effectively prevent returning of the second hydraulic actuating cylinder 9 to alter, improve work efficiency.
Present invention also offers a kind of hydraulic control system, this hydraulic control system comprises above-mentioned arm transfer valve.
Present invention also offers a kind of construction machinery and equipment, this project machinery also comprises above-mentioned hydraulic control system.
In sum, arm transfer valve of the present invention is connected with shunting circuit and feed circuit in switching circuit, by integrated layouts such as the various valves in switching circuit, shunting circuit and feed circuit, by the automatically controlled switching controlling the first hydraulic actuating cylinder and the second hydraulic actuating cylinder; When the first hydraulic actuating cylinder bounces back, the fluid in the first bar core and the second bar core can be refluxed by shunting circuit, effectively avoid the generation of altering arm phenomenon of contracting second section arm; When the first hydraulic actuating cylinder stretches out, fluid can be carried out to the first bar core and the second bar core by feed circuit to supplement, avoid oil cylinder to inhale empty, effectively avoid the generation of stretching out second section arm time delay phenomenon, improve work efficiency, and the compact conformation of whole arm transfer valve, fitting operation are convenient.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (10)

1. an arm transfer valve, is characterized in that: comprising:
For controlling the switching circuit that the first hydraulic actuating cylinder (8) and the second hydraulic actuating cylinder (9) carry out stretching;
When described first hydraulic actuating cylinder (8) is stretched out, for carrying out the feed circuit of repairing to the first bar core (15) of described first hydraulic actuating cylinder (8) and the second bar core (16) of described second hydraulic actuating cylinder (9);
When described first hydraulic actuating cylinder (8) bounces back, for the shunting circuit that the fluid in the first bar core (15) of described first hydraulic actuating cylinder (8) and the second bar core (16) of described second hydraulic actuating cylinder (9) is carried out refluxing;
Described shunting circuit and feed circuit are all connected with described switching circuit.
2. arm transfer valve according to claim 1, it is characterized in that: described switching circuit comprises the first oil circuit (A) and the second oil circuit (B), one end of described first oil circuit (A) connects main valve (14), the other end connects the first plug-in mounting check valve (3) and the second plug-in mounting check valve (4), described first plug-in mounting check valve (3) is also communicated with by first rodless cavity (10) of pipeline with described first hydraulic actuating cylinder (8), described second plug-in mounting check valve (4) is also communicated with second rodless cavity (11) of the second bar core (16) with described second hydraulic actuating cylinder (9) by described first bar core (15), described first plug-in mounting check valve (3) and the second plug-in mounting check valve (4) switch between opening and closed condition, first rod chamber (12) of described first hydraulic actuating cylinder (8) is communicated with second rod chamber (13) of described second hydraulic actuating cylinder (9), and described first rod chamber (12) is connected with described main valve (14) by described second oil circuit (B).
3. arm transfer valve according to claim 2, is characterized in that: also comprise main reversing valve (1), and described main reversing valve (1) is for controlling the open and close of described first plug-in mounting check valve (3) and the second plug-in mounting check valve (4).
4. arm transfer valve according to claim 3, it is characterized in that: between described first oil circuit (A) and the second oil circuit (B), be also provided with shuttle valve (6), described main reversing valve (1) is connected with described shuttle valve (6), and described first oil circuit (A) realizes being connected with described main reversing valve (1) respectively by described shuttle valve (6) by the switching of oil pressure with the second oil circuit (B).
5. arm transfer valve according to claim 4, is characterized in that: described shunting circuit is arranged between described second rodless cavity (11) and fuel tank (T).
6. arm transfer valve according to claim 5, is characterized in that: described shunting circuit comprises solenoid directional control valve (2), and described solenoid directional control valve (2) is positioned between described second rodless cavity (11) and described fuel tank (T).
7. arm transfer valve according to claim 6, is characterized in that: described shunting circuit also comprises dash pot valve (7), and described dash pot valve (7) is arranged between described second rodless cavity (11) and described solenoid directional control valve (2).
8. arm transfer valve according to claim 7, is characterized in that: described feed circuit comprises check valve (5), and described check valve (5) is arranged between described second rodless cavity (11) and described fuel tank (T).
9. a hydraulic control system, is characterized in that: comprise the arm transfer valve as described in any one of claim 1-8.
10. a construction machinery and equipment, is characterized in that: comprise hydraulic control system as claimed in claim 9.
CN201310531153.4A 2013-10-31 2013-10-31 Crane jib switching valve, hydraulic control system and engineering machinery Pending CN104591011A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310531153.4A CN104591011A (en) 2013-10-31 2013-10-31 Crane jib switching valve, hydraulic control system and engineering machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310531153.4A CN104591011A (en) 2013-10-31 2013-10-31 Crane jib switching valve, hydraulic control system and engineering machinery

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Publication Number Publication Date
CN104591011A true CN104591011A (en) 2015-05-06

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104477795A (en) * 2015-01-13 2015-04-01 中船华南船舶机械有限公司 Multi-stage oil cylinder telescopic device and method for installing multi-state oil cylinder telescopic device on telescopic crane
CN105545853A (en) * 2015-12-31 2016-05-04 徐州重型机械有限公司 Telescopic control valve, multi-stage telescopic hydraulic system and hoist jib telescopic hydraulic control system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3911729A1 (en) * 1989-04-11 1990-10-18 Century Ii Gmbh Mobilkrane Hydraulic system for telescopic jib crane - provides independent control of jib sections permitting simultaneous telescoping
CN1763385A (en) * 2005-10-28 2006-04-26 三一重工股份有限公司 Valve oil supplement method for series connection cylinders and apparatus therefor
CN202251171U (en) * 2011-09-05 2012-05-30 三一汽车起重机械有限公司 Motion control device of cylinders in series
CN102838042A (en) * 2012-09-12 2012-12-26 三一重工股份有限公司 Crane and double-telescopic-cylinder independent control hydraulic system thereof
CN202988614U (en) * 2012-12-20 2013-06-12 中联重科股份有限公司 Suspension arm stretching control system and engineering machine with same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3911729A1 (en) * 1989-04-11 1990-10-18 Century Ii Gmbh Mobilkrane Hydraulic system for telescopic jib crane - provides independent control of jib sections permitting simultaneous telescoping
CN1763385A (en) * 2005-10-28 2006-04-26 三一重工股份有限公司 Valve oil supplement method for series connection cylinders and apparatus therefor
CN202251171U (en) * 2011-09-05 2012-05-30 三一汽车起重机械有限公司 Motion control device of cylinders in series
CN102838042A (en) * 2012-09-12 2012-12-26 三一重工股份有限公司 Crane and double-telescopic-cylinder independent control hydraulic system thereof
CN202988614U (en) * 2012-12-20 2013-06-12 中联重科股份有限公司 Suspension arm stretching control system and engineering machine with same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104477795A (en) * 2015-01-13 2015-04-01 中船华南船舶机械有限公司 Multi-stage oil cylinder telescopic device and method for installing multi-state oil cylinder telescopic device on telescopic crane
CN105545853A (en) * 2015-12-31 2016-05-04 徐州重型机械有限公司 Telescopic control valve, multi-stage telescopic hydraulic system and hoist jib telescopic hydraulic control system
CN105545853B (en) * 2015-12-31 2018-04-17 徐州重型机械有限公司 Extension and contraction control valve, multi-stage expansion hydraulic system and arm of derrick stretch hydraulic control system

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