CN104370223A

CN104370223A - Hydraulic control system for controlling sequential telescoping of three cylinders, lifting arm mechanism and crane

Info

Publication number: CN104370223A
Application number: CN201410617862.9A
Authority: CN
Inventors: 程磊; 满军; 满珍; 陈志伟; 陈磊; 余旋; 商晓恒
Original assignee: Xuzhou XCMG Truck Mounted Crane Co Ltd
Current assignee: Xuzhou XCMG Truck Mounted Crane Co Ltd
Priority date: 2014-11-05
Filing date: 2014-11-05
Publication date: 2015-02-25
Anticipated expiration: 2034-11-05
Also published as: CN104370223B

Abstract

The invention discloses a hydraulic control system for controlling sequential telescoping of three cylinders. The hydraulic control system comprises a stretching control linkage, a balance valve, a first telescopic cylinder, a second telescopic cylinder, a third telescopic cylinder, a first one-way valve bank and a second one-way valve bank, wherein the stretching control linkage, the balance valve and the first telescopic cylinder are orderly communicated with each other by use of an oil line; the first one-way valve bank is connected and communicated with the first telescopic cylinder by the oil line; the second one-way valve bank is communicated with the first telescopic cylinder and the first one-way valve bank by the oil line, the second telescopic cylinder is communicated with the first telescopic cylinder and the first one-way valve bank through the oil line, the second telescopic cylinder is fixedly connected and communicated with the second one-way valve bank, and the third telescopic cylinder is communicated with the second telescopic cylinder and the second one-way valve bank by the oil line. The hydraulic control system for controlling sequential telescoping of three cylinders guarantees that the hoisting performance of the crane is well developed, and is suitable for sequential telescoping of a lifting arm mechanism in a truck-mounted straight arm crane under the control of three cylinders, and is particularly suitable for sequential telescoping and on-load telescoping of the lifting arm under the working conditions of no load in position and on-load working.

Description

Control the hydraulic control system of three cylinder sequential telescopics, suspension arm mechanism and hoisting crane

Technical field

The present invention relates to engineering machinery field, especially about a kind of for controlling the hydraulic control system of three cylinder sequential telescopics, adopting the suspension arm mechanism of this hydraulic control system, and there is the straight-arm lorry-mounted crane of this suspension arm mechanism.

Background technology

At present, the hoisting arm expansion of straight-arm lorry-mounted crane mostly is synchronization telescope, and its method is that a telescopic hydraulic cylinder is arranged according to the corresponding tricks rope of telescopic boom total joint number traction, then drives each joint telescopic boom synchronization telescope.But when arm drags a fixed load, telescopic boom joint number more than three joints, jib distortion, list are restricted, and load is excessive easily causes wire cable rupture, there is safety problem.

Along with the development of market, technology, the twin-tub even multi-cylinder such as three cylinders completes the trend that hoisting arm expansion technology becomes development.The sequential telescopic of straight arm type suspension arm of lorry-mounted crane refers to that each joint telescopic boom completes in certain sequence and stretches out and retract action.Load-carrying ability after stretching to make each joint telescopic boom and hoisting crane lifting performance match, and stretch out order for from outside to inside, stretch out successively, and it is from inside to outside that order is retracted, and retracts successively.Because of the requirement of straight arm type lorry-mounted crane oad relevant criterion and the consideration of outward appearance, generally telescopic hydraulic cylinder is arranged in telescopic jib.Straight arm type lorry-mounted crane arm body section is less, carries flexible demand for meeting market lorry-mounted crane band, promotes the load-carrying ability of small amplitude further, and straight arm type lorry-mounted crane telescopic hydraulic cylinder number majority flexible under heavier load behavior is three.First telescopic hydraulic cylinder drags first segment telescopic boom, second telescopic hydraulic cylinder drags second section telescopic boom, 3rd telescopic hydraulic cylinder, according to the corresponding tricks rope row of telescopic boom total joint number traction, drives each joint telescopic boom synchronization telescope except first and second joint telescopic boom then.

Single oil cylinder sequential telescopic is driven to carry out a large amount of elaboration to twin-tub in existing investigative technique, as the hydraulic efficiency pressure system of a kind of control two oil cylinder sequential telescopics that patent CN201818571U proposes, adopt two change-over valves and two balance cocks, control two hydraulic actuating cylinders respectively, principle is simple, but complicated operation, and number of elements is more, installation dimension is large, and commonality is poor; The method of patent " straight arm type suspension arm of lorry-mounted crane the realizes twin-tub sequential telescopic " oil circuit also between two telescopic hydraulic cylinders installs a slice electromagnetic valve, after first telescopic hydraulic cylinder execution, handling electromagnetic valve again makes second hydraulic actuating cylinder start action, high and the complex structure of the method cost, the reliability of electromagnetic valve and coiling apparatus is not high, the failure probability that adds whole mechanism.

Lorry-mounted crane is mounted on cargo truck, and by the restriction of full car length, the length of single-unit arm is restricted, also and the length of oil cylinder be restricted, twin-tub can only solve the ability to function of small amplitude.For the effect propety of the amplitude such as large in strengthening further, especially band carries a flexible ability, must develop the multi-cylinder sequential telescopic of more than three cylinders.Propose a kind of three grades of telescopic oil cylinders in paper " three grades of overhanging unordered failure analysis of telescoping cylinder " and control single oil cylinder sequential telescopic device, its principle of work is: install check valve and collision block at first and second grade of telescopic oil cylinder cylinder bottom, after first order telescopic oil cylinder stretches out and puts in place, the collision block installed bottom cylinder barrel clashes into the collision block on the telescopic oil cylinder of the second stage and the check valve opening bottom makes second stage telescopic oil cylinder rodless cavity oil-feed, second stage telescopic oil cylinder stretches out, it is as the same that third stage telescopic oil cylinder stretches out principle, thus realize first, second and third grade of telescopic oil cylinder order and stretch out; Otherwise, during retraction, after first third stage telescopic oil cylinder is retracted and is put in place, collision block bottom cylinder barrel clashes into the collision block on the telescopic oil cylinder of the second stage and opens the check valve of bottom, second stage telescopic oil cylinder oil return line is got through, second stage telescopic oil cylinder starts to retract, and third stage telescopic oil cylinder retraction principle is as the same, thus realize the 3rd, two, one-level telescopic oil cylinder order retracts.But the method requires very high to the right alignment in the telescopic oil cylinder course of processing, problem is as easy as rolling off a log causes flexible unordered fault to occur for the milli machine distortion etc. of framing member, and reliability is not high.

Summary of the invention

For the problems referred to above, the object of the invention is to propose the hydraulic control system of a kind of control three cylinder sequential telescopics, suspension arm mechanism and hoisting crane, this hydraulic control system is simple to operate, can control suspension arm mechanism sequential telescopic under heavier load behavior, and flexible sequential security is reliable.

For achieving the above object, the invention provides the hydraulic control system of a kind of control three cylinder sequential telescopics, comprise extension and contraction control connection, balance cock, the first telescopic oil cylinder, the second telescopic oil cylinder, the 3rd telescopic oil cylinder, the first check valve group and the second check valve group.

Extension and contraction control coupling, in switching pressure oil direction, realizes the control to the first telescopic oil cylinder, the second telescopic oil cylinder, the 3rd telescopic oil cylinder expanding-contracting action.

Balance cock is for ensureing that arm is steadily retracted under loads.

First telescopic oil cylinder, the second telescopic oil cylinder, the 3rd telescopic oil cylinder are controlled telescopic oil cylinder.

First check valve group, for controlling the sequence of operation between the first telescopic oil cylinder and the second telescopic oil cylinder, when realization is stretched out the first telescopic oil cylinder stretch out completely after the second telescopic oil cylinder can stretch out, during retraction the second telescopic oil cylinder retract completely after the first telescopic oil cylinder can retract.

Second check valve group, for controlling the sequence of operation between the second telescopic oil cylinder and the 3rd telescopic oil cylinder, when realization is stretched out the second telescopic oil cylinder stretch out completely after the 3rd telescopic oil cylinder can stretch out, during retraction the 3rd telescopic oil cylinder retract completely after the second telescopic oil cylinder can retract.

Extension and contraction control connection, balance cock, the first telescopic oil cylinder are connected by oil circuit successively order, and the first check valve group is fixedly connected with the first telescopic oil cylinder, and the first check valve group is communicated with by oil circuit with between the first telescopic oil cylinder simultaneously; Second telescopic oil cylinder is connected with the first telescopic oil cylinder, the first check valve group by oil circuit, second telescopic oil cylinder is fixedly connected with the second check valve group, second telescopic oil cylinder is connected by oil circuit with the second check valve group simultaneously, and the 3rd telescopic oil cylinder is communicated with the second telescopic oil cylinder, the second check valve group by oil circuit.

Extension and contraction control connection comprises the first check valve, change-over valve, the secondary by pass valve in A side, the secondary by pass valve in B side.

Balance cock comprises the first by pass valve, the second check valve and flow regulating valve.

First telescopic oil cylinder is the version of built-in core pipe, and the first telescopic oil cylinder comprises first piston bar, the first rod chamber, the first rodless cavity and the first cylinder body.

Second telescopic oil cylinder is the version of built-in core pipe, comprises the second piston rod, the second rod chamber, the second rodless cavity, the second cylinder body.

3rd telescopic oil cylinder comprises the 3rd piston rod, the 3rd rod chamber, the 3rd rodless cavity, the 3rd cylinder body.

First check valve group comprises the 3rd check valve, the first pressure-compensated valve, the second pressure-compensated valve and the 4th check valve.

Second check valve group comprises the 5th check valve, the 3rd pressure-compensated valve, the 4th pressure-compensated valve and the 6th check valve.

Balance cock, the first telescopic oil cylinder, the second telescopic oil cylinder, the 3rd telescopic oil cylinder include the first actuator port, the second actuator port, the 3rd actuator port and the 4th actuator port; First, second telescopic oil cylinder also comprises the 5th actuator port, the 6th actuator port, the 7th actuator port.

First check valve group, the second check valve group are provided with check valve group first actuator port, check valve group second actuator port, check valve group the 3rd actuator port.

Change-over valve is provided with pressure oil port, return opening, change-over valve first actuator port, change-over valve second actuator port and meta return opening; The pressure oil port of change-over valve is communicated with chargine line, and the first check valve is arranged on chargine line, and the oil outlet of the first check valve is communicated with the pressure oil port of change-over valve; The return opening of change-over valve is communicated with fuel tank, and change-over valve first actuator port is communicated with the first actuator port of balance cock, and change-over valve second actuator port is communicated with the second actuator port of balance cock; On the oil circuit that change-over valve first actuator port is communicated with the first actuator port C of balance cock, side connects the secondary by pass valve in A side, the oil outlet of the secondary by pass valve in A side is communicated with fuel tank, on the oil circuit that change-over valve second actuator port is communicated with the second actuator port of balance cock, side connects the secondary by pass valve in B side, and the oil outlet of the secondary by pass valve in B side is communicated with fuel tank;

Change-over valve in extension and contraction control connection has change-over valve first actuator port A and change-over valve second actuator port B, change-over valve second actuator port B is communicated with the first rod chamber of the first telescopic oil cylinder, change-over valve first actuator port A is communicated with the individual event valve group first actuator port D of the first check valve group by the built-in core pipe of the first telescopic oil cylinder, and the individual event valve group second actuator port D of the first check valve group passes through the first rodless cavity of the first telescopic oil cylinder and the built-in core pipe of the second telescopic oil cylinder is communicated with the individual event valve group first actuator port D of the second check valve group.

The rod chamber of the second telescopic oil cylinder is communicated with the first rod chamber of the first telescopic oil cylinder, and individual event valve group second actuator port of the second check valve group is communicated with by the 3rd rodless cavity of the second rodless cavity of the second telescopic oil cylinder and built-in core Guan Yu tri-telescopic oil cylinder of the 3rd telescopic oil cylinder.

3rd rod chamber of the 3rd telescopic oil cylinder is communicated with the second rod chamber of the second telescopic oil cylinder.

Change-over valve has the first working position, the second working position and the 3rd working position, change-over valve is when the first working position, pressure oil port, return opening, change-over valve first actuator port, change-over valve second actuator port are not all communicated with each other, and the pressure oil entered by pressure oil port is by meta return opening oil sump tank; Change-over valve is when the second working position, and pressure oil port is communicated with change-over valve first actuator port, and return opening is communicated with change-over valve second actuator port; Change-over valve is when the 3rd working position, and pressure oil port is communicated with change-over valve second actuator port, and return opening is communicated with the first actuator port; The pressure oil port of change-over valve is communicated with chargine line, and the return opening of change-over valve is communicated with fuel tank, and the change-over valve first actuator port core pipe built-in with the first telescopic oil cylinder is communicated with, and change-over valve second actuator port is communicated with the rod chamber of the first telescopic oil cylinder.

Further, otherly on the oil circuit that the change-over valve first actuator port core pipe built-in with the first telescopic oil cylinder is communicated be connected to first level by pass valve, the oil outlet of first level by pass valve is communicated with fuel tank.

Further, on the oil circuit that change-over valve second actuator port is communicated with the rod chamber of the first telescopic oil cylinder, side is connected to second subprime by pass valve, and the oil outlet of second subprime by pass valve is communicated with fuel tank.

Further, the first telescopic oil cylinder comprises first piston bar and the first cylinder body, the built-in core pipe of first piston bar, and one end of core pipe is positioned at the cavity of the bar section of first piston bar, and joins with extension and contraction control and be communicated with; The other end of core pipe is fixedly installed on the cylinder bottom of the first cylinder body, and is communicated with check valve group first actuator port of the first check valve group; A built-in rod chamber oil duct in the bar section of first piston bar, be communicated with the rod chamber that extension and contraction control joins the second actuator port and the first telescopic oil cylinder, the cylinder bottom of the first cylinder body arranges an oil duct, is communicated with check valve group second actuator port of the first rodless cavity and the first check valve group.

Further, the second telescopic oil cylinder comprises the second piston rod and the second cylinder body, the built-in core pipe of the second piston rod, and one end of core pipe is positioned at the cavity of the bar section of the second piston rod, and is communicated with the first telescopic oil cylinder rodless cavity; The other end of core pipe is fixedly installed on the cylinder bottom of the second cylinder body, and is communicated with the second check valve group first hydraulic fluid port; In the bar section of the second piston rod, a built-in rod chamber oil duct, is communicated with the rod chamber of the first telescopic oil cylinder rod chamber and the second telescopic oil cylinder, and the cylinder bottom of the second cylinder body arranges an oil duct, is communicated with the second hydraulic fluid port of the second rodless cavity and the second check valve group.

Further, the 3rd telescopic oil cylinder comprises the 3rd piston rod and the 3rd cylinder body, the built-in core pipe of the 3rd piston rod, and one end of core pipe is positioned at the cavity of the bar section of the 3rd piston rod, and is communicated with the second telescopic oil cylinder rodless cavity; The other end of the 3rd rodless cavity oil duct is communicated with the rodless cavity of the 3rd telescopic oil cylinder; A built-in rod chamber oil duct in the bar section of the 3rd piston rod, is communicated with the rod chamber of the second telescopic oil cylinder and the rod chamber of the 3rd telescopic oil cylinder.

Further, the oil circuit between extension and contraction control connection and the first telescopic oil cylinder arranges a balance cock.

Further, balance cock comprises the first actuator port, the second actuator port, the 3rd actuator port, the 4th actuator port, the first actuator port that first actuator port and the extension and contraction control of balance cock join is communicated with, the second actuator port that second actuator port and the extension and contraction control of balance cock join is communicated with, the core pipe that 3rd actuator port of balance cock is built-in with the first telescopic oil cylinder is communicated with, and the 4th actuator port of balance cock is communicated with the rod chamber of the first telescopic oil cylinder.

Further, the first check valve group comprises the 3rd check valve, the first pressure-compensated valve, the 4th check valve, the second pressure-compensated valve, is arranged on the cylinder base of the first telescopic oil cylinder;

Further, the second check valve group comprises the 5th check valve, the 3rd pressure-compensated valve, the 6th check valve, the 4th pressure-compensated valve, is arranged on the cylinder base of the second telescopic oil cylinder;

Further, first check valve group first pressure compensation valve opening pressure is greater than the first telescopic oil cylinder and the second telescopic oil cylinder stretches out resistance difference, when stretching out, 4th one-way valve opens, first rodless cavity oil-feed, first telescopic oil cylinder stretches out, now the first pressure-compensated valve cuts out, after the first telescopic oil cylinder stretches out and puts in place, pressure oil continues to enter the first rodless cavity, first rodless cavity oil liquid pressure is increased to the first pressure compensation valve opening pressure and the second telescopic oil cylinder stretches out resistance sum, first pressure-compensated valve is opened, pressure oil starts to enter the second telescopic oil cylinder rodless cavity, second telescopic oil cylinder starts to stretch out,

Further, second check valve group the 3rd pressure compensation valve opening pressure is greater than the second telescopic oil cylinder and the 3rd telescopic oil cylinder stretches out resistance difference, before second telescopic oil cylinder stretches out and puts in place, the 3rd pressure-compensated valve cuts out, after treating that the second telescopic oil cylinder stretches out and puts in place, pressure oil continues to enter the second rodless cavity, second rodless cavity oil liquid pressure is increased to the 3rd pressure compensation valve opening pressure and the 3rd telescopic oil cylinder stretches out resistance sum, 3rd pressure-compensated valve is opened, pressure oil starts to enter the 3rd telescopic oil cylinder rodless cavity, 3rd telescopic oil cylinder starts to stretch out, put in place until the 3rd telescopic oil cylinder stretches out, cut-off pressure oil,

Further, 4th pressure compensation valve opening pressure is greater than the 3rd telescopic oil cylinder and the second telescopic oil cylinder retraction resistance difference, second pressure compensation valve opening pressure is greater than the second telescopic oil cylinder and the first telescopic oil cylinder retraction resistance difference, first, second, 3rd rodless cavity is directly communicated with by pipeline, before 3rd telescopic oil cylinder is retracted and is put in place, second, four pressure-compensated valves cut out, first, two telescopic oil cylinder rodless cavity oil return lines are cut off, the 3rd telescopic oil cylinder is now only had to retract, after the 3rd telescopic oil cylinder retraction puts in place, 3rd rod chamber continues to enter pressure oil makes this cavity pressure raise, when pressure is increased to the 3rd telescopic oil cylinder and the second telescopic oil cylinder retraction resistance difference and the 4th pressure compensation valve opening pressure sum, 4th pressure-compensated valve is opened, second rodless cavity oil return line is opened, second telescopic oil cylinder starts to retract, but the first check valve group second precompression valve response pressure is greater than the second check valve group the 4th precompression valve response pressure, now the second pressure-compensated valve still cuts out, first rodless cavity oil return line is still cut off, after the second telescopic oil cylinder retraction puts in place, second rod chamber continues to enter pressure oil makes this cavity pressure raise, until when reaching the second telescopic oil cylinder and the first telescopic oil cylinder retraction resistance difference and the second pressure compensation valve opening pressure sum, second pressure-compensated valve is opened, first rodless cavity oil return line is opened, first telescopic oil cylinder starts to retract, put in place until retract, cut-off pressure oil.

Extension and contraction control connection is change-over valve, when at the first working position, pressure oil port oil-feed, pressure oil oil duct bottom the built-in core pipe of the first actuator port, balance cock, the first actuator port and the first telescopic oil cylinder and cylinder barrel enters the first check valve group, open the second check valve, pressure oil enters the first rodless cavity, and the first telescopic oil cylinder stretches out;

First telescopic oil cylinder stretches out and puts in place, first rodless cavity oil liquid pressure raises, the setting pressure and the second telescopic oil cylinder that reach the first pressure-compensated valve stretch out resistance sum, open the first pressure-compensated valve, pressure oil oil duct bottom the first actuator port of the 7th actuator port, the second telescopic oil cylinder and built-in core pipe and cylinder barrel enters the second check valve group, 4th one-way valve opens, pressure oil enters the second rodless cavity, and the second telescopic oil cylinder stretches out;

Second telescopic oil cylinder stretches out and puts in place, second rodless cavity oil liquid pressure raises, reach the response pressure of the 3rd pressure-compensated valve, 3rd pressure-compensated valve is opened, pressure oil enters the 3rd rodless cavity of the 3rd telescopic oil cylinder through the second check valve group the 3rd actuator port, the 7th actuator port of the second telescopic oil cylinder and the first actuator port of the 3rd telescopic oil cylinder, and the 3rd telescopic oil cylinder stretches out;

The oil return of the 3rd rod chamber is through the 6th actuator port, the second rod chamber, the 4th actuator port of the second telescopic oil cylinder, the second actuator port of the second telescopic oil cylinder, the 6th actuator port of the first telescopic oil cylinder, the first rod chamber, the 4th actuator port of the first telescopic oil cylinder, the second actuator port of the first telescopic oil cylinder, balance cock, the second actuator port of change-over valve, the oil return inlet T oil sump tank of its 4th actuator port, the 3rd actuator port, the second telescopic oil cylinder.

As above, three cylinders stretch out successively, drive that each joint arm is corresponding to be stretched out, and complete order and stretch out.

Extension and contraction control connection is switched to the second working position of change-over valve, and by the pressure oil port P oil-feed of change-over valve, pressure oil is through the second actuator port of change-over valve, balance cock, second actuator port of the first telescopic oil cylinder, 4th actuator port of the first telescopic oil cylinder, first rod chamber, 6th actuator port of the first telescopic oil cylinder, second actuator port of the second telescopic oil cylinder, 4th actuator port of the second telescopic oil cylinder, second rod chamber, 6th actuator port of the second telescopic oil cylinder, 3rd actuator port of the 3rd telescopic oil cylinder, 4th actuator port of the 3rd telescopic oil cylinder enters the 3rd rod chamber, and the oil return of the 3rd rodless cavity is through the second actuator port of the 3rd telescopic oil cylinder, first actuator port of the 3rd telescopic oil cylinder, 7th actuator port of the second telescopic oil cylinder, 3rd actuator port of the second check valve group, 5th check valve, first actuator port of the second check valve group, 3rd actuator port of the second telescopic oil cylinder, first actuator port of the second telescopic oil cylinder, 7th actuator port of the first telescopic oil cylinder, 3rd actuator port of the first check valve group, 3rd check valve, first actuator port of the first check valve group, 3rd actuator port of the first telescopic oil cylinder, first actuator port of the first telescopic oil cylinder, balance cock, first actuator port of change-over valve in extension and contraction control connection, oil return inlet T oil sump tank, 3rd cylinder body is retracted under the effect of pressure oil, now, because the 4th pressure compensation valve opening pressure is greater than the 3rd telescopic oil cylinder and the second telescopic oil cylinder retraction resistance difference, second pressure compensation valve opening pressure is greater than the second telescopic oil cylinder and the first telescopic oil cylinder retraction resistance difference, and second, four pressure-compensated valves are not opened, and first, the rodless cavity oil return line of two telescopic oil cylinders is cut off, and only has the 3rd telescopic oil cylinder to retract,

3rd cylinder body is retracted and is put in place, 3rd rod chamber oil liquid pressure raises, when oil liquid pressure reaches the response pressure value sum that the retraction resistance difference of the 3rd telescopic oil cylinder and the second telescopic oil cylinder and the 4th pressure-compensated valve set, 4th pressure-compensated valve is opened, and the oil return of the second rodless cavity is through the 5th actuator port of the second telescopic oil cylinder, second actuator port of the second check valve group, 4th precompression valve, first actuator port of the second check valve group, 3rd actuator port of the second telescopic oil cylinder, first actuator port of the second telescopic oil cylinder, 7th actuator port of the first telescopic oil cylinder, 3rd actuator port of the first check valve group, 3rd check valve, first actuator port of the first check valve group, 3rd actuator port of the first telescopic oil cylinder, first actuator port of the first telescopic oil cylinder, balance cock, first actuator port of change-over valve, return opening oil sump tank, second cylinder body is retracted under the effect of pressure oil, now, because the second pressure compensation valve opening pressure is greater than the second telescopic oil cylinder and the first telescopic oil cylinder retraction resistance difference, and its response pressure is greater than the 4th pressure compensation valve opening pressure, second pressure-compensated valve temporary close, the first telescopic oil cylinder rodless cavity oil return line is cut off, and only has the second telescopic oil cylinder to retract,

Second cylinder body is retracted and is put in place, second rod chamber oil liquid pressure raises, when oil liquid pressure reaches retraction resistance difference and the second pressure compensation valve opening pressure sum of the second telescopic oil cylinder and the first telescopic oil cylinder, 3rd pressure-compensated valve is opened, the oil return of the first rodless cavity is through the 5th actuator port of the first telescopic oil cylinder, second actuator port of the first check valve group, second pressure-compensated valve, first actuator port of the first check valve group, 3rd actuator port of the first telescopic oil cylinder, first actuator port of the first telescopic oil cylinder, balance cock, first actuator port of change-over valve in extension and contraction control connection, return opening oil sump tank, first cylinder body is retracted under the effect of pressure oil,

As above, three cylinders are retracted successively, drive the corresponding retraction of each joint arm, complete order retraction.

For achieving the above object, present invention also offers a kind of suspension arm mechanism, fixed arm, multi-stage telescopic arms, retraction drag-line and many groups stretch out drawing cable mechanism, also comprise, the hydraulic control system of above-mentioned control three cylinder sequential telescopic;

Described multi-stage telescopic arms is arranged in fixed arm, and can stretch out fixed arm), described retraction drag-line for the telescopic boom that bounces back, described in stretch out drawing cable mechanism for stretching out telescopic boom;

The first piston bar of described first telescopic oil cylinder is fixedly connected with fixed arm, and the first cylinder body of the first telescopic oil cylinder is fixedly connected with the first segment telescopic boom of multi-stage telescopic arms;

Second piston rod of the second telescopic oil cylinder is fixedly connected with the first segment telescopic boom of multi-stage telescopic arms, and the second cylinder body of the second telescopic oil cylinder is fixedly connected with the second section telescopic boom of multi-stage telescopic arms;

3rd piston rod of the 3rd telescopic oil cylinder is fixedly connected with the second section telescopic boom of multi-stage telescopic arms, and the 3rd cylinder body of the 3rd telescopic oil cylinder is fixedly connected with Section of three telescopic boom of multi-stage telescopic arms.

Multi-stage telescopic arms comprises n and saves telescopic boom, is respectively first segment telescopic boom, second section telescopic boom, Section of three telescopic boom, four joint telescopic boom, Section of five telescopic booms ... n-th joint telescopic boom; As n=3, comprise fixed arm and three joints telescopic boom (first segment telescopic boom, second section telescopic boom, Section of three telescopic boom), do not comprise and stretch out drawing cable mechanism, the first telescopic oil cylinder, the second telescopic oil cylinder, the second telescopic oil cylinder control three joint telescopic booms respectively.

Many groups are stretched out drawing cable mechanism and comprise n-3 group and stretch out drawing cable mechanism, and n is more than or equal to 3, be respectively first group stretch out drawing cable mechanism, second group stretch out drawing cable mechanism ... n-th-3 group stretches out drawing cable mechanism.

The piston rod controlling the first telescopic oil cylinder in the hydraulic control system of three cylinder sequential telescopics is fixedly connected with fixed arm, the cylinder body of the first telescopic oil cylinder is fixedly connected with first segment telescopic boom, the piston rod controlling the second telescopic oil cylinder in the hydraulic control system of three cylinder sequential telescopics is fixedly connected with first segment telescopic boom, the cylinder body of the second telescopic oil cylinder is fixedly connected with second section telescopic boom, the piston rod controlling the 3rd telescopic oil cylinder in the hydraulic control system of three cylinder sequential telescopics is fixedly connected with second section telescopic boom, and the cylinder body of the 3rd telescopic oil cylinder is fixedly connected with Section of three telescopic boom; First telescopic oil cylinder drives first segment telescopic boom stretch out and retract; Second telescopic oil cylinder drives second section telescopic boom stretch out and retract; 3rd telescopic oil cylinder stretches out drawing cable mechanism by many groups and retraction drawing cable mechanism drives the telescopic boom of more than Section of three telescopic boom and Section of three telescopic boom stretch out and retract.

Control acting as of the first telescopic oil cylinder in the hydraulic control system of three cylinder sequential telescopics: drive first segment telescopic boom stretch out and retract;

Control acting as of the second telescopic oil cylinder in the hydraulic control system of three cylinder sequential telescopics: drive second section telescopic boom stretch out and retract;

Control acting as of the 3rd telescopic oil cylinder in the hydraulic control system of three cylinder sequential telescopics: drive Section of three telescopic boom stretch out and retract;

3rd telescopic oil cylinder is by two groups and stretch out drawing cable mechanism and retraction drag-line drives synchronously stretching out and retracting of Section of three telescopic boom and more than Section three telescopic boom above.

For achieving the above object, present invention also offers a hoisting crane, it comprises above-mentioned suspension arm mechanism.

Based on technique scheme, the present invention at least has following beneficial effect:

1, three cylinders stretch, and compared with twin-tub, significantly operational capability in increasing, meets the job requirements of significantly heavy duty;

2, the present invention switches the direction of pressure oil by extension and contraction control joint control system, can realize stretching out, the control of retraction and the position that quits work, when extension and contraction control connection be switched to stretch out working position time, by the Stress control failure-free of the first check valve group first pressure-compensated valve ensure that the first telescopic oil cylinder and first segment telescopic boom stretch out put in place after the second telescopic oil cylinder and second section telescopic boom can stretch out, by the Stress control of the second check valve group the 3rd pressure-compensated valve reliably ensure that the second telescopic oil cylinder and second section telescopic boom stretch out after the telescopic boom of the 3rd telescopic oil cylinder and more than Section three can stretch out, thus ensure that the order of three cylinders is stretched out, when extension and contraction control connection is switched to retraction working position, reliably ensure that only the second telescopic oil cylinder can be retracted after the 3rd telescopic oil cylinder is retracted completely by the Stress control of the 4th pressure-compensated valve of the second check valve group, reliably ensure that only the first telescopic oil cylinder can be retracted after the second telescopic oil cylinder is retracted completely by the Stress control of the first check valve group second pressure-compensated valve, thus ensure that order is retracted.

Therefore, the hydraulic control system of control three cylinder sequential telescopic provided by the invention all relies on fluid control when three cylinder orders are stretched out and order is retracted, the unordered fault of sequential telescopic caused because of structure Light deformation avoiding that the machine liquid complex art such as dependence check valve and collision block mentioned in background technology brings, principle is simple, easy to operate, reliability is high, and check valve group is fixed on bottom cylinder barrel by board-like connection mode, be applicable to that straight-arm lorry-mounted crane telescopic boom inner space is little, the feature of compact conformation, thus ensure that hoisting crane lifting performance plays better.

2, by the distinctive core tubular construction of the first telescopic oil cylinder in conjunction with the first check valve group, the second telescopic oil cylinder distinctive core tubular construction makes geo-stationary between two between all hydraulic fluid ports needing to connect in conjunction with the second check valve group, thus avoids the problem of pipeline extension; And balance cock, the first telescopic oil cylinder and the second telescopic oil cylinder, pipeline between the second telescopic oil cylinder with the 3rd telescopic oil cylinder are connected without length variance; Therefore, the delivering oil such as reel or drag chain need not be used, have be easy to arrange, take up room little, reliability high, can be widely used in the straight-arm lorry-mounted crane that the inner installing space of arm is little, maintenance handling labor amount is large.

3, the present invention is applicable to the suspension arm mechanism sequential telescopic under three cylinders control in straight-arm lorry-mounted crane, and particularly unloaded in place, the sequential telescopic of the operating mode arm of band year work and band carry flexible.

4, the secondary by pass valve in A side is set at extension and contraction control connection, effectively protects the first telescopic oil cylinder, avoid the longitudinal bending under too high oil liquid pressure effect of telescopic oil cylinder built-in core pipe and destroy, band can be met again simultaneously and carry flexible pressure demand.

5, the secondary by pass valve in B side is set at extension and contraction control connection, thus load and arm deadweight can be utilized to retract, greatly reduce retraction pressure, and improve robust motion, reduce energy consumption, lengthen working hours, unloaded pressure demand of retracting can be met again simultaneously.

6, the mode that three cylinder sequential telescopic band single oil cylinder mixing are flexible has been used: when stretching out, first pressure compensation valve opening pressure setting value is greater than the first telescopic oil cylinder and stretches out resistance difference, 3rd pressure compensation valve opening pressure setting value is greater than the second telescopic oil cylinder and stretches out resistance difference, ensure that the order of three cylinders is stretched out; During retraction, the response pressure setting value of the 4th pressure-compensated valve is greater than the retraction resistance difference of the second telescopic oil cylinder, the response pressure setting value of the second pressure-compensated valve is greater than the retraction resistance difference of the first telescopic oil cylinder, second pressure compensation valve opening pressure setting value is greater than the 4th pressure compensation valve opening pressure setting value, reliably ensure that after only having the 3rd telescopic oil cylinder to retract completely, the second telescopic oil cylinder can be retracted, and after only having the second telescopic oil cylinder to retract completely, the first telescopic oil cylinder can be retracted.Therefore, the sequential telescopic of three cylinders all relies on fluid control, principle simply, reliably high, stable performance, the phenomenon of again stretching out after there will not be telescoping cylinder to retract.

7, the first telescopic oil cylinder, the second telescopic oil cylinder are in conjunction with the first check valve group, the second check valve group, make geo-stationary between two between all hydraulic fluid ports needing to connect, thus avoid the problem of pipeline extension.Balance cock, the first telescopic oil cylinder, pipeline between the second telescopic oil cylinder and the 3rd telescopic oil cylinder connect without length variance.Therefore, the delivering oil such as reel or drag chain need not be used, have be easy to arrange, take up room little, reliability high, can be widely used in the constructional feature of the straight-arm lorry-mounted crane that the inner installing space of arm is little, maintenance handling labor amount is large.

8, the bottom that the first check valve group is installed on the bottom of the first cylinder body, the second check valve group is installed on the second cylinder body, all by gasket mounted mode, avoids the problems such as the high and maintenance difficult of complex structure that control cock and oil cylinder integral structure bring, cost.

9 specifically flexible feature of the present invention: stable performance, the phenomenon of again stretching out after there will not be telescoping cylinder to retract.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the principle schematic of the hydraulic control system of control three cylinder sequential telescopic provided by the invention;

Fig. 1-1 is extension and contraction control connection structural representation of the present invention;

Fig. 1-2 is balancing valve structure schematic diagram of the present invention;

Fig. 1-3 is the present invention first telescopic oil cylinder and the first check valve group structural representation;

Fig. 1-4 is the present invention second telescopic oil cylinder and the second check valve group structural representation;

Fig. 1-5 is the present invention the 3rd telescopic oil cylinder structural representation;

Fig. 2 is the structural representation of suspension arm mechanism provided by the invention (six joint arms).

In figure:

1-extension and contraction control joins; 11-first check valve; 12-change-over valve; The secondary by pass valve in 13-A side; The secondary by pass valve in 14-B side; The pressure oil port of P-change-over valve; The return opening of T-change-over valve; A-change-over valve first actuator port; B-change-over valve second actuator port; A-first working position, b-second working position, c-the 3rd working position;

2-balance cock; 21-first by pass valve; 22-second check valve; 23-flow regulating valve; First actuator port of C1-balance cock; Second actuator port of C2-balance cock; 3rd actuator port of C3-balance cock; 4th actuator port of C4-balance cock;

3-first telescopic oil cylinder; 31-first piston bar; 32-first rod chamber; 33-first rodless cavity; 34-first cylinder body; First actuator port of A1-first telescopic oil cylinder; Second actuator port of B1-first telescopic oil cylinder; 3rd actuator port of A2-first telescopic oil cylinder; 4th actuator port of B2-first telescopic oil cylinder; 5th actuator port of A3-first telescopic oil cylinder; 6th actuator port of B3-first telescopic oil cylinder; 7th actuator port of A4-first telescopic oil cylinder;

4-second telescopic oil cylinder; 41-second piston rod; 42-second rod chamber; 43-second rodless cavity; 44-second cylinder body; First actuator port of A5-second telescopic oil cylinder; Second actuator port of B4-second telescopic oil cylinder; 3rd actuator port of A6-second telescopic oil cylinder; 4th actuator port of B5-second telescopic oil cylinder; 5th actuator port of A7-second telescopic oil cylinder; 6th actuator port of B6-second telescopic oil cylinder; 7th actuator port of A8-second telescopic oil cylinder;

5-the 3rd telescopic oil cylinder; 51-the 3rd piston rod; 52-the 3rd rod chamber; 53-the 3rd rodless cavity; 54-the 3rd cylinder body; First actuator port of A9-the 3rd telescopic oil cylinder; Second actuator port of A10-the 3rd telescopic oil cylinder; 3rd actuator port of B7-the 3rd telescopic oil cylinder; 4th actuator port of B8-the 3rd telescopic oil cylinder;

6-first check valve group; 61-the 3rd check valve; 62-first pressure-compensated valve; 63-second pressure-compensated valve; 64-the 4th check valve;

Check valve group first actuator port of D1-first check valve group; Check valve group second actuator port of D2-first check valve group; Check valve group the 3rd actuator port of D3-first check valve group;

7-second check valve group; 71-the 5th check valve; 72-the 3rd pressure-compensated valve; 73-the 6th check valve; 74-the 4th pressure-compensated valve;

Check valve group first actuator port of D4-second check valve group; Check valve group second actuator port of D5-second check valve group; Check valve group the 3rd actuator port of D6-second check valve group;

8-bounces back drag-line; 9-first group stretches out drag-line; 10-second group stretches out drag-line;

I-fixed arm; II-first segment telescopic boom; III-second section telescopic boom; IV-three saves telescopic boom; V-four saves telescopic boom; VI-five saves telescopic boom.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in embodiment is clearly and completely described.Obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

As shown in Figure 1, the hydraulic control system of control three cylinder sequential telescopic provided by the invention comprises extension and contraction control connection 1, balance cock 2, first telescopic oil cylinder 3, second telescopic oil cylinder 4, the 3rd telescopic oil cylinder 5, first check valve group 6 and the second check valve group 7.

Extension and contraction control connection 1, for switching pressure oil direction, realizes the control to oil cylinder expanding-contracting action.As shown in Figure 1, give a kind of specific implementation structure of extension and contraction control connection 1 in Fig. 1, but be not limited to this structure.Extension and contraction control connection 1 in Fig. 1 and Fig. 1-1 comprises the first check valve 11, change-over valve 12, the secondary by pass valve in A side 13, the secondary by pass valve 14 in B side.

Extension and contraction control connection 1, for switching pressure oil direction, realizes the control to the first telescopic oil cylinder 3, second telescopic oil cylinder 4, the 3rd telescopic oil cylinder 5 expanding-contracting action;

Balance cock 2 is for ensureing that arm is steadily retracted under loads;

First telescopic oil cylinder 3, second telescopic oil cylinder 4, the 3rd telescopic oil cylinder 5 are controlled telescopic oil cylinder;

First check valve group 6, for controlling the sequence of operation between the first telescopic oil cylinder 3 and the second telescopic oil cylinder 4, when realization is stretched out the first telescopic oil cylinder 3 stretch out completely after the second telescopic oil cylinder 4 can stretch out, during retraction, the second telescopic oil cylinder 4 afterwards the first telescopic oil cylinder 3 of retracting completely can be retracted;

Second check valve group 7, for controlling the sequence of operation between the second telescopic oil cylinder 4 and the 3rd telescopic oil cylinder 5, when realization is stretched out the second telescopic oil cylinder 4 stretch out completely after the 3rd telescopic oil cylinder 5 can stretch out, during retraction, the 3rd telescopic oil cylinder 5 afterwards the second telescopic oil cylinder 4 of retracting completely can be retracted;

Extension and contraction control connection 1, balance cock 2, first telescopic oil cylinder 3 are connected by oil circuit successively order, and described first check valve group 6 is fixedly connected with the first telescopic oil cylinder 3, and described first check valve group 6 is communicated with by oil circuit with between the first telescopic oil cylinder 3 simultaneously; Described second telescopic oil cylinder 4 is connected with the first telescopic oil cylinder 3, first check valve group 6 by oil circuit, described second telescopic oil cylinder 4 is fixedly connected with the second check valve group 7, described second telescopic oil cylinder 4 is connected by oil circuit with the second check valve group 7 simultaneously, and described 3rd telescopic oil cylinder 5 is communicated with the second telescopic oil cylinder 4, second check valve group 7 by oil circuit.

Change-over valve 12 is provided with pressure oil port P, oil return inlet T, change-over valve first actuator port A, change-over valve second actuator port B, and meta return opening.Change-over valve 12 has the first working position, the second working position and the 3rd working position, change-over valve 12 is when the first working position, pressure oil port P, oil return inlet T, change-over valve first actuator port A, change-over valve second actuator port B are not all communicated with each other, and the pressure oil entered by pressure oil port P is by meta return opening oil sump tank; Change-over valve 12 is when the second working position, pressure oil port P is communicated with change-over valve first actuator port A, and oil return inlet T is communicated with change-over valve second actuator port B, and change-over valve 12 is when the 3rd working position, pressure oil port P is communicated with the second actuator port B, and oil return inlet T is communicated with change-over valve first actuator port A.

The pressure oil port P of change-over valve 12 is communicated with chargine line, and the first check valve 11 is arranged on chargine line, and the oil outlet of the first check valve 11 is communicated with the pressure oil port P of change-over valve 12, flows backwards to prevent fluid.The oil return inlet T of change-over valve 12 is communicated with fuel tank.First actuator port A of change-over valve 12 is communicated with the first actuator port C1 of balance cock 2, and the second actuator port B of change-over valve 12 is communicated with the second actuator port C2 of balance cock 2.On the oil circuit that the first actuator port A of change-over valve 12 is communicated with the first actuator port C1 of balance cock 2, preferably side connects the secondary by pass valve 13 in A side, the oil outlet of the secondary by pass valve 13 in A side is communicated with fuel tank, on the oil circuit that the second actuator port B of change-over valve 12 is communicated with the second actuator port C2 of balance cock 2, preferably the other oil outlet connecing the secondary by pass valve 14 in secondary by pass valve 14, B side, B side is communicated with fuel tank.

As shown in Figure 1-2, balance cock 2 is arranged on the end of first piston bar 31, can ensure that arm is steadily retracted under loads.First actuator port C1 of balance cock 2 is communicated with the first actuator port A of change-over valve 12, and the second actuator port C2 of balance cock 2 is communicated with the second actuator port B of change-over valve 12.3rd actuator port C3 of balance cock 2 is directly communicated with the first actuator port A1 of the first telescopic oil cylinder 3, need not connect by pipeline; 4th actuator port C4 of balance cock 2 is directly communicated with the second actuator port B1 of the first telescopic oil cylinder 3, need not connect by pipeline, can prevent from causing arm to bounce back because of leakage loss or pipeline damage.

As shown in Fig. 1 and Fig. 1-2, give a kind of specific implementation structure of balance cock 2 in Fig. 1, but be not limited to this structure.The first by pass valve 21 and the second check valve 22 is provided with between first actuator port C1 of balance cock 2 and the 3rd actuator port C3, the oil inlet of the first by pass valve 21 is communicated with the 3rd actuator port C3 of balance cock 2, and the oil outlet of the first by pass valve 21 is communicated with the first actuator port C1 of balance cock 2.The oil inlet of the second check valve 22 is communicated with the first actuator port C1 of balance cock 2, the oil outlet of the second check valve 22 is communicated with the 3rd actuator port C3 of balance cock 2, second actuator port C2 of balance cock 2 is communicated with the 4th actuator port C4, on first by pass valve 21, side connects flow regulating valve 23, and the other end of flow regulating valve 23 is communicated with the oil circuit between the second actuator port C2 of balance cock 2 and the 4th actuator port C4.

As Figure 1-3, first telescopic oil cylinder 3 is the version of built-in core pipe, first telescopic oil cylinder 3 comprises first piston bar 31 and the first cylinder body 34, and is provided with the first actuator port A1, the second actuator port B1, the 3rd actuator port A2, the 4th actuator port B2, the 5th actuator port A3, the 6th actuator port B3, the 7th actuator port A4.

As Figure 1-4, the second telescopic oil cylinder 4 is the version of built-in core pipe, comprises the second piston rod 41 and the second cylinder body 43, and is provided with the first actuator port A7, the second actuator port A8, the 3rd actuator port B4, the 4th actuator port B5.

As Figure 1-5, the 3rd telescopic oil cylinder 5 comprises the 3rd piston rod 51 and the 3rd cylinder body 54, and is provided with the first actuator port A7, the second actuator port A8, the 3rd actuator port B4, the 4th actuator port B5.

First check valve group 6 comprises the 3rd check valve 61, first pressure-compensated valve 62, second pressure-compensated valve 63, the 4th check valve 64, is set directly at the bottom of the first cylinder body 34.4th check valve 64 unilaterally connected extension and contraction control connection 1 first actuator port A to the first rodless cavity 33 pressure oil circuit, prevent the counter-flow that pressure oil is joined by the first rodless cavity 33 to extension and contraction control, its response pressure is 0.5 ~ 1bar; First pressure-compensated valve 62 is placed in oil circuit between the first rodless cavity 33 to the second rodless cavity 43, its response pressure is 10 ~ 45bar, be greater than the first telescopic oil cylinder 3 and stretch out resistance and the second telescopic oil cylinder 4 stretches out resistance difference, ensure that only the first telescopic oil cylinder 3 stretch out put in place after the second telescopic oil cylinder 4 just can stretch out; The oil return circuit of the 3rd check valve 61 unilaterally connected the 3rd rodless cavity 53 to extension and contraction control connection 1, prevent extension and contraction control from joining the counter-flow of 1 to the 3rd rodless cavity, its response pressure is 0.5 ~ 1bar; Second pressure-compensated valve 63 is placed in the oil return line of the first rodless cavity 33 to extension and contraction control connection 1, its response pressure is 20 ~ 60bar, be greater than the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3 to retract resistance difference, ensure that only the second telescopic oil cylinder 4 retract put in place after the first telescopic oil cylinder 3 just start retraction;

First check valve group 6 is provided with check valve group first actuator port, check valve group second actuator port D2, check valve group the 3rd actuator port D3, wherein, the check valve group first actuator port D1 of the first check valve group 6 is communicated with the 3rd actuator port A2 of the first telescopic oil cylinder 3, the check valve group second actuator port D2 of the first check valve group 6 is communicated with the 5th actuator port A3 of the first telescopic oil cylinder 3, and check valve group the 3rd actuator port D3 of the first check valve group 6 is communicated with the 7th actuator port A4 of the first telescopic oil cylinder 3.

Second check valve group 7 comprises the 5th check valve the 71, three pressure-compensated valve 72, the 4th pressure-compensated valve 73, the 6th check valve 74, is set directly at the bottom of the second cylinder body 44.6th check valve 74 unilaterally connected first rodless cavity 33 to the second rodless cavity 43 pressure oil circuit, prevent pressure oil by the counter-flow of the second rodless cavity 43 to the first rodless cavity 33, its response pressure is 0.5 ~ 1bar; 3rd pressure-compensated valve 72 is placed in oil circuit between the second rodless cavity 43 to the three rodless cavity 53, its response pressure is 10 ~ 45bar, be greater than the second telescopic oil cylinder 4 and the 3rd telescopic oil cylinder 5 stretches out resistance difference, ensure that only the second telescopic oil cylinder 4 stretch out put in place after the 3rd telescopic oil cylinder 5 just can stretch out; The oil return circuit of the 5th check valve 71 unilaterally connected the 3rd rodless cavity 53 to extension and contraction control connection 1, prevent extension and contraction control from joining the counter-flow of 1 to the 3rd rodless cavity, its response pressure is 0.5 ~ 1bar; 4th pressure-compensated valve 73 is placed in the oil return line of the second rodless cavity 43 to extension and contraction control connection 1, its response pressure is 10 ~ 45bar, be greater than the 3rd telescopic oil cylinder 5 and the second telescopic oil cylinder 4 to retract resistance difference, ensure that only the 3rd telescopic oil cylinder 5 retract put in place after the second telescopic oil cylinder 4 just start retraction;

Second check valve group 7 is provided with check valve group first actuator port D4, check valve group second actuator port D5, check valve group the 3rd actuator port D6, wherein, the check valve group first actuator port D4 of the second check valve group 7 is communicated with the 3rd actuator port A6 of the second telescopic oil cylinder 4, the check valve group second actuator port D5 of the second check valve group 7 is communicated with the 5th actuator port A7 of the second telescopic oil cylinder 4, and check valve group the 3rd actuator port D6 of the second check valve group 7 is communicated with the 7th actuator port A8 of the second telescopic oil cylinder 4.

As shown in Figure 1, in Fig. 1, the fluid in the first actuator port D4 to the second actuator port D5 direction of the second check valve group 7 is freely communicated with by the 6th check valve 74.The oil outlet of the 3rd check valve 71 is communicated with the first actuator port D4 of the second check valve group 7 with the oil inlet of the 3rd pressure-compensated valve 72; The oil inlet of the 5th check valve 71 is communicated with the 3rd actuator port D6 of the second check valve group 7 with the oil outlet of the 3rd pressure-compensated valve 72; The oil inlet of the 6th check valve 74 is communicated with the first actuator port D4 of the second check valve group 7 with the oil outlet of the 4th pressure-compensated valve 73; The oil outlet of the 6th check valve 74 is communicated with the second actuator port D5 of the second check valve group 7 with the oil inlet of the 4th pressure-compensated valve 73.

In order to avoid, oil liquid pressure is excessive causes telescopic oil cylinder built-in core pipe generation longitudinal bending to destroy, need again to ensure that oil liquid pressure is enough large to stretch out to realize band year, therefore, the secondary by pass valve 13 in A side is set between the first actuator port A of change-over valve 12 and the oil return inlet T of change-over valve 12.

For increasing hydraulic efficiency pressure system damping by overflow, reduce fluctuation of pressure when retracting and utilize load to conduct oneself with dignity and realize arm retraction, thus improve robust motion, reduction energy consumption, need again to ensure that oil liquid pressure is enough large to realize unloaded retraction, therefore, the secondary by pass valve 14 in B side is set between the second actuator port B of change-over valve 12 and the oil return inlet T of change-over valve 12.

In above-described embodiment, change-over valve 12 can adopt three six-way transfer valves, there are three working positions, under the first working position, pressure oil port P is communicated with the first actuator port A, oil return inlet T is communicated with the second actuator port B, under the second working position, pressure oil port P is communicated with the second actuator port B, oil return inlet T is communicated with the first actuator port A, under the 3rd working position, pressure oil port P, oil return inlet T, the first actuator port A, the second actuator port B are not all communicated with each other, and the hydraulic oil entered by pressure oil port P is by meta return opening oil sump tank.First, second, third 3 working positions respectively corresponding oil cylinder stretch out, retract and stop three kinds of actions.

Extension and contraction control connection 1 is three six logical hand change over valves, when at the first working position, pressure oil port P oil-feed, pressure oil oil duct bottom the first actuator port A, balance cock 2, first actuator port A1 and the built-in core pipe of the first telescopic oil cylinder 3 and cylinder barrel enters the first check valve group 6, open the second check valve 62, pressure oil enters the first rodless cavity 33, first telescopic oil cylinder 3 and stretches out;

First telescopic oil cylinder 3 stretches out and puts in place, first rodless cavity 33 oil liquid pressure raises, the setting pressure and the second telescopic oil cylinder that reach the first pressure-compensated valve 62 stretch out resistance sum, open the first pressure-compensated valve 62, pressure oil oil duct bottom the first actuator port A5 of the 7th actuator port A4, the second telescopic oil cylinder 4 and built-in core pipe and cylinder barrel enters the second check valve group 7,4th check valve 74 is opened, and pressure oil enters the second rodless cavity 43, second telescopic oil cylinder 4 and stretches out;

Second telescopic oil cylinder 4 stretches out and puts in place, second rodless cavity 43 oil liquid pressure raises, reach the response pressure of the 3rd pressure-compensated valve 72,3rd pressure-compensated valve 72 is opened, the 3rd rodless cavity the 53, three telescopic oil cylinder that pressure oil enters the 3rd telescopic oil cylinder 5 through the second check valve group 7 the 3rd actuator port D6, the 7th actuator port A8 of the second telescopic oil cylinder 4 and the first actuator port A9 of the 3rd telescopic oil cylinder 5 stretches out;

The oil return of the 3rd rod chamber 52 is through its 4th actuator port B8, 3rd actuator port B7, 6th actuator port B6 of the second telescopic oil cylinder 4, second rod chamber 42, 4th actuator port B5 of the second telescopic oil cylinder 4, second actuator port B4 of the second telescopic oil cylinder 4, 6th actuator port B3 of the first telescopic oil cylinder 3, first rod chamber 32, 4th actuator port B2 of the first telescopic oil cylinder 3, second actuator port B1 of the first telescopic oil cylinder 3, balance cock 2, second actuator port B of change-over valve 12, oil return inlet T oil sump tank.

Extension and contraction control connection 1 is switched to the second working position of change-over valve 12, and by the pressure oil port P oil-feed of change-over valve 12, pressure oil is through the second actuator port B of change-over valve 12, balance cock 2, second actuator port B1 of the first telescopic oil cylinder 3, 4th actuator port B2 of the first telescopic oil cylinder 3, first rod chamber 32, 6th actuator port B3 of the first telescopic oil cylinder 3, second actuator port B4 of the second telescopic oil cylinder 4, 4th actuator port B5 of the second telescopic oil cylinder 4, second rod chamber 42, 6th actuator port B6 of the second telescopic oil cylinder 4, 3rd actuator port B7 of the 3rd telescopic oil cylinder 5, 4th actuator port B8 of the 3rd telescopic oil cylinder 5 enters the second actuator port A10 of oil return through the 3rd telescopic oil cylinder 5 of the 3rd rod chamber the 52, three rodless cavity 53, first actuator port A9 of the 3rd telescopic oil cylinder 5, 7th actuator port A8 of the second telescopic oil cylinder 4, 3rd actuator port D6 of the second check valve group 7, 5th check valve 71, first actuator port D4 of the second check valve group 7, 3rd actuator port A6 of the second telescopic oil cylinder 4, first actuator port A5 of the second telescopic oil cylinder 4, 7th actuator port A4 of the first telescopic oil cylinder 3, 3rd actuator port D3 of the first check valve group 6, 3rd check valve 63, first actuator port D1 of the first check valve group 6, 3rd actuator port A2 of the first telescopic oil cylinder 3, first actuator port A1 of the first telescopic oil cylinder 3, balance cock 2, first actuator port A of change-over valve 12 in extension and contraction control connection 1, oil return inlet T oil sump tank, 3rd cylinder body 54 is retracted under the effect of pressure oil, now, to retract resistance difference because the 4th pressure-compensated valve 73 response pressure is greater than the 3rd telescopic oil cylinder 5 and the second telescopic oil cylinder 4, second pressure-compensated valve 63 response pressure is greater than the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3 and retracts resistance difference, and second, four pressure-compensated valves are not opened, and first, the rodless cavity oil return line of two telescopic oil cylinders is cut off, and only has the 3rd telescopic oil cylinder to retract,

3rd cylinder body 54 is retracted and is put in place, 3rd rod chamber 52 oil liquid pressure raises, when oil liquid pressure reaches the response pressure value sum that the retraction resistance difference of the 3rd telescopic oil cylinder 5 and the second telescopic oil cylinder 4 and the 4th pressure-compensated valve 73 set, 4th pressure-compensated valve 73 is opened, and the oil return of the second rodless cavity 43 is through the 5th actuator port A7 of the second telescopic oil cylinder, second actuator port D5 of the second check valve group 7, 4th precompression valve 73, first actuator port D4 of the second check valve group 7, 3rd actuator port A6 of the second telescopic oil cylinder 4, first actuator port A5 of the second telescopic oil cylinder 4, 7th actuator port A4 of the first telescopic oil cylinder 3, 3rd actuator port D3 of the first check valve group 6, 3rd check valve 61, first actuator port D1 of the first check valve group 6, 3rd actuator port A2 of the first telescopic oil cylinder 3, first actuator port A1 of the first telescopic oil cylinder 3, balance cock 2, first actuator port A of change-over valve 12, oil return inlet T oil sump tank, second cylinder body 44 is retracted under the effect of pressure oil, now, to retract resistance difference because the second pressure compensation valve opening pressure is greater than the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3, and its response pressure is greater than the 4th pressure compensation valve opening pressure, second pressure-compensated valve temporary close, the first telescopic oil cylinder rodless cavity oil return line is cut off, and only has the second telescopic oil cylinder to retract,

Second cylinder body 44 is retracted and is put in place, second rod chamber 42 oil liquid pressure raises, when oil liquid pressure reaches retraction resistance difference and the second pressure-compensated valve 63 response pressure sum of the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3, 3rd pressure-compensated valve 63 is opened, the oil return of the first rodless cavity 33 is through the 5th actuator port A3 of the first telescopic oil cylinder, second actuator port D2 of the first check valve group 6, second pressure-compensated valve 63, first actuator port D1 of the first check valve group 6, 3rd actuator port A2 of the first telescopic oil cylinder 3, first actuator port A1 of the first telescopic oil cylinder 3, balance cock 2, first actuator port A of change-over valve 12 in extension and contraction control connection 1, oil return inlet T oil sump tank, first cylinder body 34 is retracted under the effect of pressure oil,

Suspension arm mechanism provided by the invention adopts the hydraulic control system of above-mentioned control three cylinder sequential telescopic.Enumerate a specific embodiment of suspension arm mechanism provided by the invention below.As shown in Figure 2, fixed arm I, multi-stage telescopic arms, retraction drag-line 8 and many groups stretch out drawing cable mechanism, also comprise, the hydraulic control system of above-mentioned control three cylinder sequential telescopic;

Multi-stage telescopic arms is arranged in fixed arm I, and can stretch out fixed arm I, and retraction drag-line 8 is for the telescopic boom that bounces back, and stretch out drawing cable mechanism for stretching out telescopic boom, multi-stage telescopic arms is set in sequence in last telescopic boom successively, and can stretch out last telescopic boom;

The first piston bar 31 of the first telescopic oil cylinder 3 is fixedly connected with fixed arm I, and the first cylinder body 37 of the first telescopic oil cylinder 3 is fixedly connected with the first segment telescopic boom II of multi-stage telescopic arms;

Second piston rod 41 of the second telescopic oil cylinder 4 is fixedly connected with the first segment telescopic boom II of multi-stage telescopic arms, and the second cylinder body 46 of the second telescopic oil cylinder 4 is fixedly connected with the second section telescopic boom III of multi-stage telescopic arms;

3rd piston rod 51 of the 3rd telescopic oil cylinder 5 is fixedly connected with the second section telescopic boom III of multi-stage telescopic arms, and the 3rd cylinder body 54 of the 3rd telescopic oil cylinder 5 is fixedly connected with Section of three telescopic boom IV of multi-stage telescopic arms.

Multi-stage telescopic arms comprises n and saves telescopic boom, is respectively first segment telescopic boom II, second section telescopic boom III, Section of three telescopic boom IV, four joint telescopic boom V, Section of five telescopic boom VI ... n-th joint telescopic boom;

Many groups are stretched out drawing cable mechanism and comprise n-3 group and stretch out drawing cable mechanism, and n is more than or equal to 3, are respectively first group and stretch out drawing cable mechanism 9, second group and stretch out drawing cable mechanism 10 ... n-th-3 group stretches out drawing cable mechanism 10.

Many groups are stretched out drawing cable mechanism stretching out for the telescopic boom that controls not to be connected with the first telescopic oil cylinder 3, second telescopic oil cylinder 4, the 3rd telescopic oil cylinder 5, can make four joint telescopic booms V, Section of five telescopic boom VI ... n-th joint telescopic boom and Section of three telescopic boom IV stretch out simultaneously.

Control acting as of the first telescopic oil cylinder 3 in the hydraulic control system of three cylinder sequential telescopics: drive first segment telescopic boom II stretch out and retract;

Control acting as of the second telescopic oil cylinder 4 in the hydraulic control system of three cylinder sequential telescopics: drive second section telescopic boom III stretch out and retract;

Control acting as of the 3rd telescopic oil cylinder 5 in the hydraulic control system of three cylinder sequential telescopics: drive Section of three telescopic boom IV stretch out and retract;

3rd telescopic oil cylinder 5 is by two groups and stretch out drawing cable mechanism and retraction drag-line 8 drives synchronously stretching out and retracting of Section of three telescopic boom IV and more than Section three telescopic boom above.

As shown in Figure 2, in the present embodiment, suspension arm mechanism comprises six joint arms (comprising fixed arm), i.e. n=5, be respectively fixed arm I, first segment telescopic boom II, second section telescopic boom III, Section of three telescopic boom IV, Section of four telescopic boom V, Section of five telescopic boom VI, also comprise retraction drag-line 8, first group to stretch out drawing cable mechanism 9, second group and stretch out drawing cable mechanism 10, and the hydraulic control system of above-mentioned control three cylinder sequential telescopic provided by the invention.

Be provided with first segment telescopic boom II in fixed arm I, first segment telescopic boom II can bounce back in fixed arm I, and can stretch out fixed arm I; Arrange second section telescopic boom III in first segment telescopic boom II, second section telescopic boom III can bounce back in first segment telescopic boom II, and can stretch out first segment telescopic boom II; Be provided with Section of three telescopic boom Section of IV, three telescopic boom IV in second section telescopic boom III can bounce back in second section telescopic boom III, and second section telescopic boom III can be stretched out; Section three, in telescopic boom IV, be provided with Section of four telescopic boom V, section four, telescopic boom V can bounce back in Section of three telescopic boom IV, and Section of three telescopic boom Section of IV, five telescopic boom VI can be stretched out can bounce back in Section of four telescopic boom V, and Section of four telescopic boom V can be stretched out.

Control being set to of the first telescopic oil cylinder 3 in the hydraulic control system of three cylinder sequential telescopics: the first piston bar 31 of the first telescopic oil cylinder 3 is fixedly connected with fixed arm I, the first cylinder body 37 of the first telescopic oil cylinder 3 is fixedly connected with first segment telescopic boom II.

Control being set to of the second telescopic oil cylinder 4 in the hydraulic control system of three cylinder sequential telescopics: the second piston rod 41 of the second telescopic oil cylinder 4 is fixedly connected with first segment telescopic boom II, the second cylinder body 46 of the second telescopic oil cylinder 4 is fixedly connected with second section telescopic boom III.

Control being set to of the 3rd telescopic oil cylinder 5 in the hydraulic control system of three cylinder sequential telescopics: the 3rd piston rod 51 of the 3rd telescopic oil cylinder 5 is fixedly connected with second section telescopic boom III, the 3rd cylinder body 54 of the 3rd telescopic oil cylinder 5 is fixedly connected with Section of three telescopic boom IV.

Section three, telescopic boom IV is connected with Section of five telescopic boom VI by the second telescopic oil cylinder 4, the 3rd telescopic oil cylinder 5 by retraction drag-line 8, stretch out stayed structure 9 in conjunction with first group and second group stretch out drawing cable mechanism 10, when retracting for Section of three telescopic boom IV drive Section of four telescopic boom V, Section of five telescopic boom VI synchronously retract; First group is stretched out drawing cable mechanism 9 by second section telescopic boom III, Section of three telescopic boom IV and Section of four telescopic boom V connection, drives Section of four telescopic boom V synchronously to stretch out when stretching out for Section of three telescopic boom III; Second group is stretched out drawing cable mechanism 8 by Section of three telescopic boom IV, Section of four telescopic boom V and Section of five telescopic boom VI connection, drives Section of five telescopic boom VI synchronously to stretch out when stretching out for Section of four telescopic boom V.

Can be found out by Fig. 1 and Fig. 2, first actuator port A1 of balance cock 2 and the first telescopic oil cylinder 3, second actuator port B1 of balance cock 2 and the first telescopic oil cylinder 3, 6th actuator port B3 of the first telescopic oil cylinder 3 and the second actuator port B4 of the second telescopic oil cylinder 4, 7th actuator port A4 of the first telescopic oil cylinder 3 and the first actuator port A5 of the second telescopic oil cylinder 4, 6th actuator port B6 of the second telescopic oil cylinder 4 and the 3rd actuator port B7 of the 3rd telescopic oil cylinder, the hydraulic fluid port that 7th actuator port A8 of the second telescopic oil cylinder 4 and the first actuator port A9 etc. of the 3rd telescopic oil cylinder need pipeline to be connected or parts geo-stationary all between two.Therefore, extension and contraction control connection 1, balance cock 2, first telescopic oil cylinder 3, second telescopic oil cylinder 4, between the 3rd telescopic oil cylinder 5, first check valve group 6 and the second check valve group 7 without pipeline extension problem, the delivering oil such as reel or drag chain need not be used, have be easy to arrange, take up room little, reliability high, is applicable to the constructional feature that the inner installing space of suspension arm mechanism is little, maintenance handling labor amount is large of straight-arm vehicle mounted type hoisting crane.

The employing provided in the above-mentioned example of the present invention controls the working process of the suspension arm mechanism of the hydraulic control system of three cylinder sequential telescopics, specific as follows:

1, extend action: extension and contraction control connection 1 is switched to the first working position of change-over valve 12, the pressure oil port P oil-feed of change-over valve 12, pressure oil oil duct bottom the first actuator port A, balance cock 2, the first actuator port A1 of change-over valve 12 and the built-in core pipe of the first telescopic oil cylinder 3 and cylinder barrel enters the first check valve group 6, second check valve 62 is opened, pressure oil enters the first rodless cavity 33, first telescopic oil cylinder 3 and stretches out;

After the first telescopic oil cylinder 3 reaches stroke, if change-over valve 12 is still at the first working position, oil liquid pressure continues to raise, the setting pressure and the second telescopic oil cylinder that reach the first pressure-compensated valve 62 stretch out resistance sum, first pressure-compensated valve 62 is opened, pressure oil oil duct bottom the first actuator port A5 of the 7th actuator port A4, the second telescopic oil cylinder 4 and built-in core pipe and cylinder barrel enters the second check valve group 7,4th check valve 74 is opened, pressure oil enters the second rodless cavity 43, second telescopic oil cylinder 4 and stretches out;

After the second telescopic oil cylinder 4 reaches stroke, if change-over valve 12 is still at the first working position, oil liquid pressure still continues to raise, reach the response pressure of the 3rd pressure-compensated valve 72,3rd pressure-compensated valve 72 is opened, the 3rd rodless cavity the 53, three telescopic oil cylinder that pressure oil enters the 3rd telescopic oil cylinder 5 through the second check valve group 7 the 3rd actuator port D6, the 7th actuator port A8 of the second telescopic oil cylinder 4 and the first actuator port A9 of the 3rd telescopic oil cylinder 5 stretches out;

The oil return of the 3rd rod chamber 52 is through its 4th actuator port B8, 3rd actuator port B7, 6th actuator port B6 of the second telescopic oil cylinder 4, second rod chamber 42, 4th actuator port B5 of the second telescopic oil cylinder 4, second actuator port B4 of the second telescopic oil cylinder 4, 6th actuator port B3 of the first telescopic oil cylinder 3, first rod chamber 32, 4th actuator port B2 of the first telescopic oil cylinder 3, second actuator port B1 of the first telescopic oil cylinder 3, balance cock 2, second actuator port B of change-over valve 12, oil return inlet T oil sump tank.Stretch out in process whole, realize pressure attributive function by A side secondary voltage limiting valve 13.Like this, three cylinders stretch out successively, drive that each joint arm is corresponding to be stretched out, and just complete order and stretch out.

2, retract action: extension and contraction control connection 1 is switched to the second working position of change-over valve 12, and by the pressure oil port P oil-feed of change-over valve 12, pressure oil is through the second actuator port B of change-over valve 12, balance cock 2, second actuator port B1 of the first telescopic oil cylinder 3, 4th actuator port B2 of the first telescopic oil cylinder 3, first rod chamber 32, 6th actuator port B3 of the first telescopic oil cylinder 3, second actuator port B4 of the second telescopic oil cylinder 4, 4th actuator port B5 of the second telescopic oil cylinder 4, second rod chamber 42, 6th actuator port B6 of the second telescopic oil cylinder 4, 3rd actuator port B7 of the 3rd telescopic oil cylinder 5, 4th actuator port B8 of the 3rd telescopic oil cylinder 5 enters the second actuator port A10 of oil return through the 3rd telescopic oil cylinder 5 of the 3rd rod chamber the 52, three rodless cavity 53, first actuator port A9 of the 3rd telescopic oil cylinder 5, 7th actuator port A8 of the second telescopic oil cylinder 4, 3rd actuator port D6 of the second check valve group 7, 5th check valve 71, first actuator port D4 of the second check valve group 7, 3rd actuator port A6 of the second telescopic oil cylinder 4, first actuator port A5 of the second telescopic oil cylinder 4, 7th actuator port A4 of the first telescopic oil cylinder 3, 3rd actuator port D3 of the first check valve group 6, 3rd check valve 63, first actuator port D1 of the first check valve group 6, 3rd actuator port A2 of the first telescopic oil cylinder 3, first actuator port A1 of the first telescopic oil cylinder 3, balance cock 2, first actuator port A of change-over valve 12 in extension and contraction control connection 1, oil return inlet T oil sump tank, 3rd cylinder body 54 is retracted under the effect of pressure oil, now, to retract resistance difference because the 4th pressure-compensated valve 73 response pressure is greater than the 3rd telescopic oil cylinder 5 and the second telescopic oil cylinder 4, second pressure-compensated valve 63 response pressure is greater than the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3 and retracts resistance difference, and second, four pressure-compensated valves are not opened, and first, the rodless cavity oil return line of two telescopic oil cylinders is cut off, and only has the 3rd telescopic oil cylinder to retract,

If change-over valve 12 is still at the second working position after the 3rd cylinder body 54 retraction puts in place, oil liquid pressure continues to raise, when oil liquid pressure reaches the response pressure value sum that the retraction resistance difference of the 3rd telescopic oil cylinder 5 and the second telescopic oil cylinder 4 and the 4th pressure-compensated valve 73 set, 4th pressure-compensated valve 73 is opened, and the oil return of the second rodless cavity 43 is through the 5th actuator port A7 of the second telescopic oil cylinder, second actuator port D5 of the second check valve group 7, 4th precompression valve 73, first actuator port D4 of the second check valve group 7, 3rd actuator port A6 of the second telescopic oil cylinder 4, first actuator port A5 of the second telescopic oil cylinder 4, 7th actuator port A4 of the first telescopic oil cylinder 3, 3rd actuator port D3 of the first check valve group 6, 3rd check valve 61, first actuator port D1 of the first check valve group 6, 3rd actuator port A2 of the first telescopic oil cylinder 3, first actuator port A1 of the first telescopic oil cylinder 3, balance cock 2, first actuator port A of change-over valve 12, oil return inlet T oil sump tank, second cylinder body 44 is retracted under the effect of pressure oil, now, to retract resistance difference because the second pressure compensation valve opening pressure is greater than the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3, and its response pressure is greater than the 4th pressure compensation valve opening pressure, second pressure-compensated valve temporary close, the first telescopic oil cylinder rodless cavity oil return line is cut off, and only has the second telescopic oil cylinder to retract,

After second cylinder body 44 is retracted and is put in place, if change-over valve 12 is still at the second working position, oil liquid pressure continues to raise, when oil liquid pressure reaches retraction resistance difference and the second pressure-compensated valve 63 response pressure sum of the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3, 3rd pressure-compensated valve 63 is opened, the oil return of the first rodless cavity 33 is through the 5th actuator port A3 of the first telescopic oil cylinder, second actuator port D2 of the first check valve group 6, second pressure-compensated valve 63, first actuator port D1 of the first check valve group 6, 3rd actuator port A2 of the first telescopic oil cylinder 3, first actuator port A1 of the first telescopic oil cylinder 3, balance cock 2, first actuator port A of change-over valve 12 in extension and contraction control connection 1, oil return inlet T oil sump tank, first cylinder body 34 is retracted under the effect of pressure oil, until retraction puts in place, in whole retraction process, realize pressure attributive function by B side secondary voltage limiting valve 14, like this, three cylinders are retracted successively, drive the corresponding retraction of each joint arm, just complete order retraction.

3, static carrying: extension and contraction control connection 1 is switched to the 3rd working position of change-over valve 12, by the pressure oil port P oil-feed of change-over valve 12 in extension and contraction control connection 1, fluid will by meta return opening oil sump tank, system unloaded, the first telescopic oil cylinder 3, second telescopic oil cylinder 4, the 3rd telescopic oil cylinder 5 lock under the effect of change-over valve 12, balance cock 2.

Hoisting crane provided by the invention comprises above-mentioned suspension arm mechanism provided by the invention, and above-mentioned suspension arm mechanism comprises the hydraulic control system of above-mentioned control three cylinder sequential telescopic provided by the invention.Hoisting crane provided by the invention can be straight-arm lorry-mounted crane.

More than describing is only example of the present invention, does not form any limitation of the invention.Obviously for those skilled in the art; after understanding content of the present invention and principle; all may when not deviating from the principle of the invention, structure; carry out the various amendment in form and details and change, but these corrections based on this thought and change are still within claims of the present invention.

Claims

1. control the hydraulic control system of three cylinder sequential telescopics, it is characterized in that: comprise extension and contraction control connection (1), balance cock (2), the first telescopic oil cylinder (3), the second telescopic oil cylinder (4), the 3rd telescopic oil cylinder (5), the first check valve group (6) and the second check valve group (7);

Extension and contraction control connection (1), for switching pressure oil direction, realizes the control to the first telescopic oil cylinder (3), the second telescopic oil cylinder (4), the 3rd telescopic oil cylinder (5) expanding-contracting action;

Balance cock (2) is for ensureing that arm is steadily retracted under loads;

First telescopic oil cylinder (3), the second telescopic oil cylinder (4), the 3rd telescopic oil cylinder (5) are controlled telescopic oil cylinder;

First check valve group (6), for controlling the sequence of operation between the first telescopic oil cylinder (3) and the second telescopic oil cylinder (4);

Second check valve group (7), for controlling the sequence of operation between the second telescopic oil cylinder (4) and the 3rd telescopic oil cylinder (5);

Extension and contraction control connection (1), balance cock (2), the first telescopic oil cylinder (3) are connected by oil circuit successively order, described first check valve group (6) is fixedly connected with the first telescopic oil cylinder (3), and described first check valve group (6) is communicated with by oil circuit with between the first telescopic oil cylinder (3); Described second telescopic oil cylinder (4) is connected with the first telescopic oil cylinder (3), the first check valve group (6) by oil circuit, described second telescopic oil cylinder (4) is fixedly connected with the second check valve group (7), described second telescopic oil cylinder (4) is connected by oil circuit with the second check valve group (7), and described 3rd telescopic oil cylinder (5) is communicated with the second telescopic oil cylinder (4), the second check valve group (7) by oil circuit.

2. the hydraulic control system of control three cylinder sequential telescopic according to claim 1, is characterized in that:

Described extension and contraction control connection (1) comprises the secondary by pass valve in A side (13), the secondary by pass valve in B side (14);

First telescopic oil cylinder (3) is the version of built-in core pipe, and the first telescopic oil cylinder (3) comprises first piston bar (31), the first rod chamber (32), the first rodless cavity (33) and the first cylinder body (34); First rod chamber (32) and the first rodless cavity (33) are arranged in described first cylinder body (34), and described first piston bar (31) is arranged in described first rod chamber (32);

Second telescopic oil cylinder (4) is the version of built-in core pipe, comprises the second piston rod (41), the second rod chamber (42), the second rodless cavity (43), the second cylinder body (44); Second rod chamber (42), the second rodless cavity (43) are arranged in described second cylinder body (44), and described second piston rod (41) is arranged in described second rod chamber (42);

First check valve group (6) comprises the 3rd check valve (61), the first pressure-compensated valve (62), the second pressure-compensated valve (63) and the 4th check valve (64);

Second check valve group (7) comprises the 5th check valve (71), the 3rd pressure-compensated valve (72), the 4th pressure-compensated valve (73) and the 6th check valve (74);

Balance cock (2), the first telescopic oil cylinder (3), the second telescopic oil cylinder (4), the 3rd telescopic oil cylinder (5) include the first actuator port, the second actuator port, the 3rd actuator port and the 4th actuator port; Described first telescopic oil cylinder (3) also comprises the 5th actuator port, the 6th actuator port, the 7th actuator port;

Described first check valve group (6), the second check valve group (7) are provided with check valve group first actuator port, check valve group second actuator port, check valve group the 3rd actuator port.

3. the hydraulic control system of control three cylinder sequential telescopic according to claim 1, is characterized in that:

Described extension and contraction control connection (1) also comprises the first check valve (11), change-over valve (12);

Balance cock (2) comprises the first by pass valve (21), the second check valve (22) and flow regulating valve (23);

3rd telescopic oil cylinder (5) comprises the 3rd piston rod (51), the 3rd rod chamber (52), the 3rd rodless cavity (53), the 3rd cylinder body (54); 3rd rod chamber (52), the 3rd rodless cavity (53) are arranged in described 3rd cylinder body (54), and described 3rd piston rod (51) is arranged in described 3rd rod chamber (52).

4. the hydraulic control system of control three cylinder sequential telescopic according to claim 3, is characterized in that:

Described change-over valve (12) is provided with pressure oil port (P), return opening (T), change-over valve first actuator port (A), change-over valve second actuator port (B) and meta return opening; The pressure oil port (P) of change-over valve (12) is communicated with chargine line, and the first check valve (11) is arranged on chargine line, and the oil outlet of the first check valve (11) is communicated with the pressure oil port (P) of change-over valve (12); The return opening (T) of change-over valve (12) is communicated with fuel tank, and change-over valve first actuator port (A) is communicated with first actuator port (C1) of balance cock (2), and change-over valve second actuator port (B) is communicated with second actuator port (C2) of balance cock (2); On the oil circuit that change-over valve first actuator port (A) is communicated with first actuator port (C1) of balance cock (2), side connects the secondary by pass valve in A side (13), the oil outlet of the secondary by pass valve in A side (13) is communicated with fuel tank, on the oil circuit that change-over valve second actuator port (B) is communicated with second actuator port (C2) of balance cock (2), side connects the secondary by pass valve in B side (14), and the oil outlet of the secondary by pass valve in B side (14) is communicated with fuel tank;

First actuator port (C1) of balance cock is communicated with change-over valve first actuator port (A), and second actuator port (C2) of balance cock is communicated with change-over valve second actuator port (B); 3rd actuator port (C3) of balance cock (2) is directly communicated with first actuator port (A1) of the first telescopic oil cylinder; 4th actuator port (C4) of balance cock (2) is directly communicated with second actuator port (B1) of the first telescopic oil cylinder (3);

First by pass valve (21) and the second check valve (22) are arranged between first actuator port (C1) of balance cock (2) and the 3rd actuator port (C3) of balance cock (2), the oil inlet of the first by pass valve (21) is communicated with the 3rd actuator port (C3) of balance cock (2), and the oil outlet of the first by pass valve (21) is communicated with first actuator port (C1) of balance cock (2); The oil inlet of the second check valve (22) is communicated with first actuator port (C1) of balance cock (2), the oil outlet of the second check valve (22) is communicated with the 3rd actuator port (C3) of balance cock (2), second actuator port (C2) of balance cock (2) is communicated with the 4th actuator port (C4), the upper other one end connecing flow regulating valve (23) of first by pass valve (21), the other end of flow regulating valve (23) is communicated with the oil circuit between second actuator port (C2) of balance cock (2) and the 4th actuator port (C4);

First check valve group (6) is arranged on the bottom of the first cylinder body (34), and the 4th check valve (64) unilaterally connected change-over valve first actuator port (A) is to the pressure oil circuit of the first rodless cavity (33); First pressure-compensated valve (62) is arranged on the oil circuit between the first rodless cavity (33) to the second rodless cavity (43); 3rd check valve (61) unilaterally connected the 3rd rodless cavity (53) is to the oil return circuit of extension and contraction control connection (1); Second pressure-compensated valve (63) is arranged on the first rodless cavity (33) on the oil return line of extension and contraction control connection (1);

Check valve group first actuator port (D1) of the first check valve group (6) is communicated with the 3rd actuator port (A2) of the first telescopic oil cylinder (3), check valve group second actuator port (D2) of the first check valve group (6) is communicated with the 5th actuator port (A3) of the first telescopic oil cylinder (3), and the check valve group the 3rd actuator port (D3) of the first check valve group (6) is communicated with the 7th actuator port (A4) of the first telescopic oil cylinder (3);

6th check valve (74) unilaterally connected first rodless cavity (33) is to the second rodless cavity (43) pressure oil circuit; 3rd pressure-compensated valve (72) is placed in oil circuit between the second rodless cavity (43) to the 3rd rodless cavity (53); 5th check valve (71) unilaterally connected the 3rd rodless cavity (53) is to the oil return circuit of extension and contraction control connection (1); 4th pressure-compensated valve (73) is placed in the oil return line of the second rodless cavity (43) to extension and contraction control connection (1);

Check valve group first actuator port (D4) of the second check valve group (7) is communicated with the 3rd actuator port (A6) of the second telescopic oil cylinder (4), check valve group second actuator port (D5) of the second check valve group (7) is communicated with the 5th actuator port (A7) of the second telescopic oil cylinder (4), and the check valve group the 3rd actuator port (D6) of the second check valve group (7) is communicated with the 7th actuator port (A8) of the second telescopic oil cylinder (4).

5. the hydraulic control system of control three cylinder sequential telescopic according to claim 4, is characterized in that,

First pressure-compensated valve (62) response pressure of the first check valve group (6) is greater than the first telescopic oil cylinder (3) and stretches out resistance difference with second flexible oil (4) cylinder;

3rd pressure-compensated valve (72) response pressure of the second check valve group (7) is greater than the second telescopic oil cylinder (4) and stretches out resistance difference with the 3rd telescopic oil cylinder (5);

4th pressure-compensated valve (73) response pressure is greater than the 3rd telescopic oil cylinder (5) and the second telescopic oil cylinder (4) retraction resistance difference, and the second pressure-compensated valve (63) response pressure is greater than the second telescopic oil cylinder (4) and the first telescopic oil cylinder (3) retraction resistance difference.

6. the hydraulic control system of control three cylinder sequential telescopic according to claim 4, it is characterized in that, change-over valve (12) is provided with the first working position, the second working position and the 3rd working position, change-over valve (12) is when the first working position, pressure oil port (P), return opening (T), change-over valve first actuator port (A), change-over valve second actuator port (B) are not all communicated with each other, and the pressure oil entered by pressure oil port (P) is through meta return opening oil sump tank; Change-over valve (12) is when the second working position, pressure oil port (P) is communicated with change-over valve first actuator port (A), oil return inlet T is communicated with change-over valve second actuator port (B), change-over valve (12) is when the 3rd working position, pressure oil port (P) is communicated with change-over valve second actuator port (B), and return opening (T) is communicated with change-over valve first actuator port (A).

7. the hydraulic control system of control three cylinder sequential telescopic according to claim 4, it is characterized in that, check valve group first actuator port (D4) of the second check valve group (7) is freely communicated with to the fluid in check valve group second actuator port (D5) direction by the 6th check valve (74); The oil outlet of the 3rd check valve (71) is communicated with check valve group first actuator port (D4) of the second check valve group (7) with the oil inlet of the 3rd pressure-compensated valve (72); The oil inlet of the 5th check valve (71) is communicated with the check valve group the 3rd actuator port (D6) of the second check valve group (7) with the oil outlet of the 3rd pressure-compensated valve (72); The oil inlet of the 6th check valve (74) is communicated with check valve group first actuator port (D4) of the second check valve group (7) with the oil outlet of the 4th pressure-compensated valve (73); The oil outlet of the 6th check valve (74) is communicated with check valve group second actuator port (D5) of the second check valve group (7) with the oil inlet of the 4th pressure-compensated valve (73).

8. the hydraulic control system of control three cylinder sequential telescopic according to claim 4, is characterized in that, the secondary by pass valve in described A side (13) is arranged between the return opening (T) of change-over valve first actuator port (A) and change-over valve (12); The secondary by pass valve in described B side (14) is arranged between the return opening (T) of change-over valve second actuator port (B) and change-over valve (12).

9. the hydraulic control system of control three cylinder sequential telescopic according to claim 4, is characterized in that, described change-over valve (12) is three six-way transfer valves; The version that described first telescopic oil cylinder (3), the second telescopic oil cylinder (4) are built-in core pipe.

10. a suspension arm mechanism, comprises fixed arm (I), multi-stage telescopic arms, retraction drag-line (8) and many groups stretches out drawing cable mechanism, it is characterized in that, also comprise, the hydraulic control system of the control three cylinder sequential telescopic as described in any one of claim 1-8;

Described multi-stage telescopic arms is arranged in fixed arm (I), and can stretch out fixed arm (I), described retraction drag-line (8) for the telescopic boom that bounces back, described in stretch out drawing cable mechanism for stretching out telescopic boom;

The first piston bar (31) of described first telescopic oil cylinder (3) is fixedly connected with fixed arm (I), and first cylinder body (37) of the first telescopic oil cylinder (3) is fixedly connected with the first segment telescopic boom (II) of multi-stage telescopic arms;

Second piston rod (41) of the second telescopic oil cylinder (4) is fixedly connected with the first segment telescopic boom (II) of multi-stage telescopic arms, and second cylinder body (46) of the second telescopic oil cylinder (4) is fixedly connected with the second section telescopic boom (III) of multi-stage telescopic arms;

3rd piston rod (51) of the 3rd telescopic oil cylinder (5) is fixedly connected with the second section telescopic boom (III) of multi-stage telescopic arms, and the 3rd cylinder body (54) of the 3rd telescopic oil cylinder (5) is fixedly connected with Section of three telescopic boom (IV) of multi-stage telescopic arms.

11. a kind of suspension arm mechanisms according to claim 10, is characterized in that, described multi-stage telescopic arms comprises n and saves telescopic boom, and described many groups are stretched out drawing cable mechanism and comprise n-3 group and stretch out drawing cable mechanism, and n is more than or equal to 3.

12. 1 kinds of hoisting cranes, is characterized in that, comprise a kind of suspension arm mechanism as described in claim 10 or 11.