CN104370223B

CN104370223B - Control the hydraulic control system of triplex sequential telescopic, suspension arm mechanism and crane

Info

Publication number: CN104370223B
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: 2016-06-29
Anticipated expiration: 2034-11-05
Also published as: CN104370223A

Abstract

A kind of hydraulic control system controlling triplex sequential telescopic of disclosure, including extension and contraction control connection, balanced valve, 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 connection, balanced valve, the first telescopic oil cylinder pass through oil circuit sequential communication successively, and the first check valve group is connected with the first telescopic oil cylinder, passes through oil communication between the first check valve group and the first telescopic oil cylinder；Second telescopic oil cylinder is connected with the first telescopic oil cylinder, the first check valve group by oil circuit, second telescopic oil cylinder and the fixing connection of the second check valve group, second telescopic oil cylinder and the second check valve group are connected, and the 3rd telescopic oil cylinder is by oil circuit and the second telescopic oil cylinder, the second check valve group connection；This invention ensures that crane lifting performance plays better, it is adaptable to the suspension arm mechanism in straight-arm lorry-mounted crane is sequential telescopic under triplex control, be particularly well-suited to unloaded in place, the sequential telescopic of the operating mode arm with load work and band load are flexible.

Description

Control the hydraulic control system of triplex sequential telescopic, suspension arm mechanism and crane

Technical field

The present invention relates to engineering machinery field, especially with respect to a kind of for controlling the hydraulic control system of triplex sequential telescopic, 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, its method be a telescopic hydraulic cylinder according to the telescopic arm corresponding tricks rope of total joint number traction, then drive each joint telescopic arm synchronization telescope.But when arm drags a fixed load, telescopic arm joint number more than three joints, jib deformation, list are restricted, and load is excessive is easily caused wire cable rupture, there is safety problem.

Along with the development in market, technology, the multi-cylinder such as twin-tub even triplex completes hoisting arm expansion technology becomes the trend of development.The sequential telescopic of straight arm type suspension arm of lorry-mounted crane refers to that each joint telescopic arm completes to stretch out and retract action in certain sequence.In order to the elevating capacity after making each joint telescopic arm flexible matches with crane lifting performance, stretching out order for from outside to inside, stretching out successively, order is retracted as from inside to outside, retracting successively.Because of the consideration of the requirement of straight arm type lorry-mounted crane overall dimensions relevant criterion and outward appearance, generally telescopic hydraulic cylinder is arranged in telescopic jib.Straight arm type lorry-mounted crane arm body section is less, for meeting the market flexible demand of lorry-mounted crane band load, promotes the elevating capacity 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 arm, second telescopic hydraulic cylinder drags second section telescopic arm, 3rd telescopic hydraulic cylinder, according to the telescopic arm corresponding tricks rope of total joint number traction, drives each joint telescopic arm synchronization telescope except first and second joint telescopic arm then.

Twin-tub is driven single oil cylinder sequential telescopic to carry out a large amount of elaboration by existing investigative technique, such as the patent CN201818571U a kind of hydraulic system controlling two oil cylinder sequential telescopics proposed, adopt two reversal valves and two balanced valves, control two hydraulic cylinders respectively, principle is simple, but complicated operation, and number of elements is more, installation dimension is big, and versatility is poor；The method of patent " straight arm type suspension arm of lorry-mounted crane realizes twin-tub sequential telescopic " also oil circuit between two telescopic hydraulic cylinders installs a piece of electromagnetic valve, after first telescopic hydraulic cylinder execution, handling electromagnetic valve again makes second hydraulic cylinder start action, the method cost is high and structure is complicated, and the reliability of electromagnetic valve and coiling apparatus is not high, add the failure probability of 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 adding the effect propety of the amplitudes such as persistent erection of the penis is big further, the especially flexible ability of band load, it is necessary to multi-cylinder sequential telescopic more than development triplex.Paper " three grades of overhanging unordered accident analyses of telescoping cylinder " proposes a kind of three grades of telescopic oil cylinders and controls single oil cylinder sequential telescopic device, its operation principle is: install check valve and collision block at first and second grade of telescopic oil cylinder cylinder bottom, first order telescopic oil cylinder stretches out after putting in place, the collision block on the telescopic oil cylinder of the collision block shock second level installed bottom cylinder barrel the check valve opening bottom make second level telescopic oil cylinder rodless cavity oil-feed, second level telescopic oil cylinder stretches out, it is as the same that third level telescopic oil cylinder stretches out principle, stretches out thus realizing first, second and third grade of telescopic oil cylinder order；Otherwise, during retraction, after third level telescopic oil cylinder is first retracted back to position, collision block bottom cylinder barrel clashes into the collision block on the telescopic oil cylinder of the second level and opens the check valve of bottom, second level telescopic oil cylinder oil return line is made to get through, second level telescopic oil cylinder starts to retract, and third level telescopic oil cylinder retraction principle is as the same, thus realize the three, the two, one-level telescopic oil cylinder order is retracted.But, the problems such as the axiality in the telescopic oil cylinder course of processing is required very high by the method, the milli machine deformation of structural member are as easy as rolling off a log causes that flexible unordered fault occurs, reliability is not high.

Summary of the invention

For the problems referred to above, it is an object of the invention to propose a kind of control the hydraulic control system of triplex sequential telescopic, suspension arm mechanism and crane, this hydraulic control system is simple to operate, it is possible to control suspension arm mechanism sequential telescopic under heavier load behavior, and flexible sequential security is reliable.

For achieving the above object, the invention provides a kind of hydraulic control system controlling triplex sequential telescopic, including extension and contraction control connection, balanced valve, 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, it is achieved to the first telescopic oil cylinder, the second telescopic oil cylinder, the 3rd telescopic oil cylinder expanding-contracting action control.

Balanced valve is used 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 movement between the first telescopic oil cylinder and the second telescopic oil cylinder, after when realization is stretched out, the first telescopic oil cylinder is fully extended, the second telescopic oil cylinder can stretch out, and after during retraction, the second telescopic oil cylinder is fully retracted, the first telescopic oil cylinder can be retracted.

Second check valve group, for controlling the sequence of movement between the second telescopic oil cylinder and the 3rd telescopic oil cylinder, after when realization is stretched out, the second telescopic oil cylinder is fully extended, the 3rd telescopic oil cylinder can stretch out, and after during retraction, the 3rd telescopic oil cylinder is fully retracted, the second telescopic oil cylinder can be retracted.

Extension and contraction control connection, balanced valve, the first telescopic oil cylinder are connected by oil circuit successively order, and the first check valve group is fixing with the first telescopic oil cylinder to be connected, and passes through oil communication between the first check valve group and 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 and the fixing connection of the second check valve group, second telescopic oil cylinder and the second check valve group are connected by oil circuit simultaneously, and the 3rd telescopic oil cylinder is by oil circuit and the second telescopic oil cylinder, the second check valve group connection.

Extension and contraction control connection includes the first check valve, reversal valve, A side secondary overflow valve, B side secondary overflow valve.

Balanced valve includes the first overflow valve, the second check valve and choke valve.

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

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

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

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

Balanced valve, the first telescopic oil cylinder, the second telescopic oil cylinder, the 3rd telescopic oil cylinder all include the first actuator port, the second actuator port, the 3rd actuator port and the 4th actuator port；First, second telescopic oil cylinder also includes 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 the first actuator port, check valve group the second actuator port, check valve group the 3rd actuator port.

Reversal valve is provided with pressure oil port, oil return opening, reversal valve the first actuator port, reversal valve the second actuator port and middle position oil return opening；The pressure oil port of reversal valve connects with in-line, and the first check valve is arranged on in-line, and the oil-out of the first check valve connects with the pressure oil port of reversal valve；The oil return opening of reversal valve connects with fuel tank, and reversal valve the first actuator port connects with the first actuator port of balanced valve, and reversal valve the second actuator port connects with the second actuator port of balanced valve；A side secondary overflow valve is connect with side on the first actuator port C of balanced valve oil circuit connected at reversal valve the first actuator port, the oil-out of A side secondary overflow valve connects with fuel tank, on the oil circuit that reversal valve the second actuator port connects with the second actuator port of balanced valve, side connects B side secondary overflow valve, and the oil-out of B side secondary overflow valve connects with fuel tank；

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

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

3rd rod chamber of the 3rd telescopic oil cylinder and the second rod chamber connection of the second telescopic oil cylinder.

Reversal valve has the first working position, the second working position and the 3rd working position, reversal valve is when the first working position, pressure oil port, oil return opening, reversal valve the first actuator port, reversal valve the second actuator port all do not connect each other, and the pressure oil entered by pressure oil port passes through middle position oil return opening oil sump tank；Reversal valve is when the second working position, and pressure oil port connects with reversal valve the first actuator port, and oil return opening connects with reversal valve the second actuator port；Reversal valve is when three working positions, and pressure oil port connects with reversal valve the second actuator port, and oil return opening and the first actuator port connect；The pressure oil port of reversal valve connects with in-line, and the oil return opening of reversal valve connects with fuel tank, reversal valve the first actuator port and the built-in core pipe connection of the first telescopic oil cylinder, and the rod chamber of reversal valve the second actuator port and the first telescopic oil cylinder connects.

Further, other on the oil circuit of reversal valve the first actuator port and the built-in core pipe connection of the first telescopic oil cylinder being connected to first level overflow valve, the oil-out of first level overflow valve connects with fuel tank.

Further, on the oil circuit of the rod chamber connection of reversal valve the second actuator port and the first telescopic oil cylinder, side is connected to second subprime overflow valve, and the oil-out of second subprime overflow valve connects with fuel tank.

Further, the first telescopic oil cylinder includes 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 segment of first piston bar, and connects with extension and contraction control connection；The other end of core pipe is fixedly installed on the cylinder bottom of the first cylinder body, and connects with check valve group first actuator port of the first check valve group；A built-in rod chamber oil duct in the bar segment of first piston bar, connection extension and contraction control joins the second actuator port and the rod chamber of the first telescopic oil cylinder, and the cylinder bottom of the first cylinder body arranges an oil duct, connects check valve group second actuator port of the first rodless cavity and the first check valve group.

Further, the second telescopic oil cylinder includes the second piston rod and the second cylinder body, and the built-in core pipe of the second piston rod, one end of core pipe is positioned at the cavity of the bar segment of the second piston rod, and connects 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 connects with second check valve group the first hydraulic fluid port；In the bar segment of the second piston rod, a built-in rod chamber oil duct, connects 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, connects the second rodless cavity and the second hydraulic fluid port of the second check valve group.

Further, the 3rd telescopic oil cylinder includes 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 segment of the 3rd piston rod, and connects with the second telescopic oil cylinder rodless cavity；The other end of the 3rd rodless cavity oil duct and the rodless cavity connection of the 3rd telescopic oil cylinder；A built-in rod chamber oil duct in the bar segment of the 3rd piston rod, connects 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 balanced valve.

Further, balanced valve includes the first actuator port, the second actuator port, the 3rd actuator port, the 4th actuator port, the first actuator port that first actuator port of balanced valve joins with extension and contraction control connects, the second actuator port that second actuator port of balanced valve joins with extension and contraction control connects, 3rd actuator port of balanced valve and the built-in core pipe connection of the first telescopic oil cylinder, the rod chamber of the 4th actuator port of balanced valve and the first telescopic oil cylinder connects.

Further, the first check valve group includes 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 includes 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 the first pressure compensation valve opening pressure stretches out resistance difference more than the first telescopic oil cylinder and the second telescopic oil cylinder, 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 goes successively to 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 initially enters 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 stretches out resistance difference more than the second telescopic oil cylinder and the 3rd telescopic oil cylinder, second telescopic oil cylinder stretches out the 3rd pressure-compensated valve before putting in place and closes, after treating that the second telescopic oil cylinder stretches out and puts in place, pressure oil goes successively to 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 initially enters the 3rd telescopic oil cylinder rodless cavity, 3rd telescopic oil cylinder starts to stretch out, until the 3rd telescopic oil cylinder stretches out and puts in place, cut-out pressure oil；

Further, 4th pressure compensation valve opening pressure is more than the 3rd telescopic oil cylinder and the second telescopic oil cylinder retraction resistance difference, second pressure compensation valve opening pressure is more than the second telescopic oil cylinder and the first telescopic oil cylinder retraction resistance difference, first, second, 3rd rodless cavity is directly connected by pipeline, 3rd telescopic oil cylinder is retracted before putting in place, second, four pressure-compensated valves cut out, first, two telescopic oil cylinder rodless cavity oil return lines are cut off, now only the 3rd telescopic oil cylinder is retracted, after the 3rd telescopic oil cylinder is retracted and is put in place, 3rd rod chamber goes successively to 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 with 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 first check valve group the second precompressed valve opening pressure is more than the second check valve group the 4th precompressed valve opening 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 is retracted and is put in place, second rod chamber continues into pressure oil makes this cavity pressure raise, until when reaching the second telescopic oil cylinder and the first telescopic oil cylinder retraction resistance difference with 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 retracting, cut-out pressure oil.

Extension and contraction control connection is reversal 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, balanced valve, 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 reaching the first pressure-compensated valve stretches out resistance sum with the second telescopic oil cylinder, open the first pressure-compensated valve, pressure oil oil duct bottom the 7th actuator port, the first actuator port of 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 unlatching 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 its 4th actuator port, the 3rd actuator port, the 6th actuator port of the second telescopic oil cylinder, 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, balanced valve, the second actuator port of reversal valve, oil return inlet T oil sump tank.

As above, triplex stretches out successively, drives each joint arm to stretch out accordingly, completes order and stretches out.

Extension and contraction control connection is switched to the second working position of reversal valve, and by the pressure oil port P oil-feed of reversal valve, pressure oil is through the second actuator port of reversal valve, balanced valve, 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, balanced valve, first actuator port of reversal 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, due to the 4th pressure compensation valve opening pressure more than the 3rd telescopic oil cylinder and the second telescopic oil cylinder retraction resistance difference, second pressure compensation valve opening pressure more than the second telescopic oil cylinder and the first telescopic oil cylinder retraction resistance difference, second, four pressure-compensated valves are unopened, and first, the rodless cavity oil return line of two telescopic oil cylinders is cut off, and only the 3rd telescopic oil cylinder is retracted；

3rd cylinder body is retracted into position, 3rd rod chamber oil liquid pressure raises, when oil liquid pressure reaches the unlatching force value sum that the retraction resistance difference of the 3rd telescopic oil cylinder and the second telescopic oil cylinder sets with the 4th pressure-compensated valve, 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, balanced valve, first actuator port of reversal valve, oil return opening oil sump tank, second cylinder body is retracted under the effect of pressure oil, now, due to the second pressure compensation valve opening pressure more than the second telescopic oil cylinder and the first telescopic oil cylinder retraction resistance difference, and its unlatching pressure is more 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 the second telescopic oil cylinder is retracted；

Second cylinder body is retracted and is put in place, second rod chamber oil liquid pressure raises, when oil liquid pressure reaches the retraction resistance difference of the second telescopic oil cylinder and the first telescopic oil cylinder with the second pressure compensation valve opening pressure sum, 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, balanced valve, first actuator port of reversal valve in extension and contraction control connection, oil return opening oil sump tank, first cylinder body is retracted under the effect of pressure oil；

As above, triplex is retracted successively, drives each joint arm to retract accordingly, completes 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 include, the above-mentioned hydraulic control system controlling triplex sequential telescopic；

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

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

Second piston rod of the second telescopic oil cylinder is fixing with the first segment telescopic arm of multi-stage telescopic arms to be connected, and the second cylinder body of the second telescopic oil cylinder is fixing with the second section telescopic arm of multi-stage telescopic arms to be connected；

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

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

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

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

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

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

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

3rd telescopic oil cylinder is stretched out by two groups and the above synchronization stretching out drawing cable mechanism and retraction drag-line Section of three telescopic arm of drive and more than Section three telescopic arm and is retracted.

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

Based on technique scheme, the present invention at least has the advantages that

1, triplex stretches, compared with twin-tub, and significantly performance capacity in increasing, meet the job requirements of significantly heavy duty；

2, the present invention is by the direction of extension and contraction control joint control system switching pressure oil, it is capable of stretching out, the control of retraction and the position that quits work, when extension and contraction control connection is switched to and stretches out working position, ensure that the first telescopic oil cylinder and first segment telescopic arm stretch out the second telescopic oil cylinder and second section telescopic arm after putting in place and can stretch out reliably by the Stress control of first check valve group the first pressure-compensated valve, 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 arm stretch out after the telescopic arm of the 3rd telescopic oil cylinder and more than Section three can stretch out, thus ensure that the order of triplex 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 fully retracted 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 fully retracted by the Stress control of first check valve group the second pressure-compensated valve, thus ensure that order is retracted.

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

2, by the first distinctive core tubular construction of telescopic oil cylinder in conjunction with the first check valve group, the second distinctive core tubular construction of telescopic oil cylinder makes between the hydraulic fluid port that be there is a need to connect geo-stationary between two in conjunction with the second check valve group, thus the problem avoiding pipeline extension；And the pipeline between balanced valve, the first telescopic oil cylinder and the second telescopic oil cylinder, the second telescopic oil cylinder and the 3rd telescopic oil cylinder connects without length variance；Therefore, the delivering oil such as reel or drag chain need not be used, have be prone to arrange, take up room little, reliability high, can be widely applied to that the internally installed space of arm is little, the maintenance big straight-arm lorry-mounted crane of loading and unloading amount.

3, present invention suspension arm mechanism suitable in straight-arm lorry-mounted crane sequential telescopic under triplex control, particularly unloaded in place, the sequential telescopic of the operating mode arm with load work and band load are flexible.

4, A side secondary overflow valve is set at extension and contraction control connection, is effectively protected the first telescopic oil cylinder, it is to avoid the buckling under too high oil liquid pressure effect of telescopic oil cylinder built-in core pipe destroys, and disclosure satisfy that again with the pressure demand that load is flexible simultaneously.

5, B side secondary overflow valve is set at extension and contraction control connection, thus available load and arm deadweight are retracted, greatly reduces retraction pressure, and improve robust motion, reduce energy consumption, lengthen working hours, disclosure satisfy that again the pressure demand of unloaded retraction simultaneously.

6, the mode that triplex sequential telescopic stretches has been used with single oil cylinder mixing: when stretching out, first pressure-compensated valve is opened pressure set points and is stretched out resistance difference more than the first telescopic oil cylinder, 3rd pressure-compensated valve is opened pressure set points and is stretched out resistance difference more than the second telescopic oil cylinder, it is ensured that the order of triplex is stretched out；During retraction, the unlatching pressure set points of the 4th pressure-compensated valve is more than the retraction resistance difference of the second telescopic oil cylinder, the unlatching pressure set points of the second pressure-compensated valve is more than the retraction resistance difference of the first telescopic oil cylinder, second pressure-compensated valve is opened pressure set points and is opened pressure set points more than the 4th pressure-compensated valve, reliably ensure that the second telescopic oil cylinder can be retracted after only the 3rd telescopic oil cylinder is fully retracted, and the first telescopic oil cylinder can be retracted after only the second telescopic oil cylinder is fully retracted.Therefore, the sequential telescopic of triplex relies on hydraulic control, principle simply, reliably high, stable performance, do not have the phenomenon again stretched out after telescoping cylinder is retracted.

7, the first telescopic oil cylinder, the second telescopic oil cylinder in conjunction with the first check valve group, the second check valve group, make between the hydraulic fluid port that be there is a need to connect geo-stationary between two, thus the problem avoiding pipeline extension.Pipeline between balanced valve, the first telescopic oil cylinder, the second telescopic oil cylinder and the 3rd telescopic oil cylinder connects without length variance.Therefore, the delivering oil such as reel or drag chain need not be used, have be prone to arrange, take up room little, reliability high, can be widely applied to that the internally installed space of arm is little, the construction features of the maintenance big straight-arm lorry-mounted crane of loading and unloading amount.

8, the first check valve group is installed on the bottom of the first cylinder body, the second check valve group is installed on the bottom of the second cylinder body, each through gasket mounted mode, it is to avoid control that valve is complicated with the structure that oil cylinder integral structure brings, cost is high and the problem such as maintenance difficult.

9, the flexible feature of the specifically present invention: stable performance, does not have the phenomenon again stretched out after telescoping cylinder is retracted.

Accompanying drawing explanation

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:

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

Fig. 1-1 joins structural representation for extension and contraction control of the present invention；

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

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

Fig. 1-4 is the present invention the 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-the first check valve；12-reversal valve；13-A side secondary overflow valve；14-B side secondary overflow valve；The pressure oil port of P-reversal valve；The oil return opening of T-reversal valve；A-reversal valve the first actuator port；B-reversal valve the second actuator port；A-the first working position, b-the second working position, c-the 3rd working position；

2-balanced valve；21-the first overflow valve；22-the second check valve；23-choke valve；First actuator port of C1-balanced valve；Second actuator port of C2-balanced valve；3rd actuator port of C3-balanced valve；4th actuator port of C4-balanced valve；

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

4-the second telescopic oil cylinder；41-the second piston rod；42-the second rod chamber；43-the second rodless cavity；44-the second cylinder body；First actuator port of A5-the second telescopic oil cylinder；Second actuator port of B4-the second telescopic oil cylinder；3rd actuator port of A6-the second telescopic oil cylinder；4th actuator port of B5-the second telescopic oil cylinder；5th actuator port of A7-the second telescopic oil cylinder；6th actuator port of B6-the second telescopic oil cylinder；7th actuator port of A8-the 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-the first check valve group；61-the 3rd check valve；62-the first pressure-compensated valve；63-the second pressure-compensated valve；64-the 4th check valve；

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

7-the 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-the second check valve group；Check valve group second actuator port of D5-the second check valve group；Check valve group the 3rd actuator port of D6-the 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 arm；III-second section telescopic arm；IV-three saves telescopic arm；V-four saves telescopic arm；VI-five saves telescopic arm.

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, rather than whole embodiments.Based on embodiments of the invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.

As it is shown in figure 1, the hydraulic control system of control triplex sequential telescopic provided by the invention includes extension and contraction control connection 1, balanced valve the 2, first telescopic oil cylinder the 3, second telescopic oil cylinder the 4, the 3rd telescopic oil cylinder the 5, first check valve group 6 and the second check valve group 7.

Extension and contraction control connection 1 is used for switching pressure oil direction, it is achieved the control to oil cylinder expanding-contracting action.As it is shown in figure 1, the one giving extension and contraction control connection 1 in Fig. 1 implements structure, but it is not limited to this structure.Extension and contraction control connection 1 in Fig. 1 and Fig. 1-1 includes the first check valve 11, reversal valve 12, A side secondary overflow valve 13, B side secondary overflow valve 14.

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

Balanced valve 2 is used for ensureing that arm is steadily retracted under loads；

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

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

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

Extension and contraction control connection 1, balanced valve the 2, first telescopic oil cylinder 3 are connected by oil circuit successively order, and described first check valve group 6 is fixing with the first telescopic oil cylinder 3 to be connected, and passes through oil communication between described first check valve group 6 and the first telescopic oil cylinder 3 simultaneously；Described second telescopic oil cylinder 4 is connected by oil circuit and first telescopic oil cylinder the 3, first check valve group 6, described second telescopic oil cylinder 4 is fixing with the second check valve group 7 to be connected, 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 connected by oil circuit and second telescopic oil cylinder the 4, second check valve group 7.

Reversal valve 12 is provided with pressure oil port P, oil return inlet T, reversal valve the first actuator port A, reversal valve the second actuator port B and middle position oil return opening.Reversal valve 12 has the first working position, the second working position and the 3rd working position, reversal valve 12 is when the first working position, pressure oil port P, oil return inlet T, reversal valve the first actuator port A, reversal valve the second actuator port B all do not connect each other, by the pressure oil port P pressure oil entered by middle position oil return opening oil sump tank；Reversal valve 12 is when the second working position, pressure oil port P connects with reversal valve the first actuator port A, and oil return inlet T connects with reversal valve the second actuator port B, and reversal valve 12 is when three working positions, pressure oil port P and the second actuator port B connection, oil return inlet T connects with reversal valve the first actuator port A.

The pressure oil port P of reversal valve 12 connects with in-line, and the first check valve 11 is arranged on in-line, and the oil-out of the first check valve 11 connects with the pressure oil port P of reversal valve 12, to prevent fluid from flowing backwards.The oil return inlet T of reversal valve 12 connects with fuel tank.First actuator port A of reversal valve 12 connects with the first actuator port C1 of balanced valve 2, and the second actuator port B of reversal valve 12 connects with the second actuator port C2 of balanced valve 2.On the first actuator port A of reversal valve 12 and the first actuator port C1 of balanced valve 2 oil circuit connected, preferably side connects A side secondary overflow valve 13, the oil-out of A side secondary overflow valve 13 connects with fuel tank, on the second actuator port B of reversal valve 12 and the second actuator port C2 of balanced valve 2 oil circuit connected, preferably the other oil-out connecing secondary overflow valve 14, B side, B side secondary overflow valve 14 connects with fuel tank.

As shown in Figure 1-2, balanced valve 2 is arranged on the end of first piston bar 31, it is ensured that arm is steadily retracted under loads.First actuator port C1 of balanced valve 2 connects with the first actuator port A of reversal valve 12, and the second actuator port C2 of balanced valve 2 connects with the second actuator port B of reversal valve 12.3rd actuator port C3 of balanced valve 2 and the first actuator port A1 of the first telescopic oil cylinder 3 directly connects, and connects without pipeline；4th actuator port C4 of balanced valve 2 and the second actuator port B1 of the first telescopic oil cylinder 3 directly connects, and connects without pipeline, it is possible to prevent from causing arm to bounce back because of leakage loss or pipeline damage.

As shown in Fig. 1 and Fig. 1-2, the one giving balanced valve 2 in Fig. 1 implements structure, but is not limited to this structure.The first overflow valve 21 and the second check valve 22 it is provided with between first actuator port C1 and the three actuator port C3 of balanced valve 2, the oil-in of the first overflow valve 21 connects with the 3rd actuator port C3 of balanced valve 2, and the oil-out of the first overflow valve 21 connects with the first actuator port C1 of balanced valve 2.The oil-in of the second check valve 22 connects with the first actuator port C1 of balanced valve 2, the oil-out of the second check valve 22 connects with the 3rd actuator port C3 of balanced valve 2, second actuator port C2 and the four actuator port C4 connection of balanced valve 2, on first overflow valve 21, side connects choke valve 23, the oil circuit between the second actuator port C2 and the four actuator port C4 of the other end connection balanced valve 2 of choke valve 23.

As Figure 1-3, first telescopic oil cylinder 3 is the version of built-in core pipe, first telescopic oil cylinder 3 includes 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, including 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 includes 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 includes the 3rd check valve 61, first pressure-compensated valve the 62, second pressure-compensated valve the 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 first rodless cavity 33 pressure oil circuit, it is prevented that the reverse flow that pressure oil is joined by the first rodless cavity 33 to extension and contraction control, it opens pressure is 0.5～1bar；First pressure-compensated valve 62 is placed in oil circuit between first rodless cavity the 33 to the second rodless cavity 43, it opens pressure is 10～45bar, stretch out resistance more than the first telescopic oil cylinder 3 and the second telescopic oil cylinder 4 stretches out resistance difference, it is ensured that only the second telescopic oil cylinder 4 just can stretch out after the first telescopic oil cylinder 3 stretches out and puts in place；The oil return circuit of the 3rd check valve 61 unilaterally connected the 3rd rodless cavity 53 to extension and contraction control connection 1, it is prevented that the reverse flow of extension and contraction control connection 1 to the 3rd rodless cavity, it opens 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, it opens pressure is 20～60bar, retract resistance difference more than the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3, it is ensured that only after the second telescopic oil cylinder 4 is retracted and put in place, the first telescopic oil cylinder 3 just starts retraction；

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

Second check valve group 7 includes the 5th check valve 71, the 3rd pressure-compensated valve the 72, the 4th pressure-compensated valve the 73, the 6th check valve 74, is set directly at the bottom of the second cylinder body 44.6th check valve 74 unilaterally connected the first rodless cavity 33 to the second rodless cavity 43 pressure oil circuit, it is prevented that pressure oil is by the reverse flow of the second rodless cavity 43 to the first rodless cavity 33, and it opens pressure is 0.5～1bar；3rd pressure-compensated valve 72 is placed in the second rodless cavity 43 to oil circuit between the 3rd rodless cavity 53, it opens pressure is 10～45bar, resistance difference is stretched out, it is ensured that only the 3rd telescopic oil cylinder 5 just can stretch out after the second telescopic oil cylinder 4 stretches out and puts in place more than the second telescopic oil cylinder 4 and the 3rd telescopic oil cylinder 5；The oil return circuit of the 5th check valve 71 unilaterally connected the 3rd rodless cavity 53 to extension and contraction control connection 1, it is prevented that the reverse flow of extension and contraction control connection 1 to the 3rd rodless cavity, it opens 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, it opens pressure is 10～45bar, retract resistance difference more than the 3rd telescopic oil cylinder 5 and the second telescopic oil cylinder 4, it is ensured that only after the 3rd telescopic oil cylinder 5 is retracted and put in place, the second telescopic oil cylinder 4 just starts retraction；

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

As it is shown in figure 1, the fluid in the first actuator port D4 to second actuator port D5 direction of the second check valve group 7 freely can be connected by the 6th check valve 74 in Fig. 1.First actuator port D4 connection of the oil-out of the 3rd check valve 71 and the oil-in of the 3rd pressure-compensated valve 72 and the second check valve group 7；3rd actuator port D6 connection of the oil-in of the 5th check valve 71 and the oil-out of the 3rd pressure-compensated valve 72 and the second check valve group 7；First actuator port D4 connection of the oil-in of the 6th check valve 74 and the oil-out of the 4th pressure-compensated valve 73 and the second check valve group 7；Second actuator port D5 connection of the oil-out of the 6th check valve 74 and the oil-in of the 4th pressure-compensated valve 73 and the second check valve group 7.

In order to avoid, oil liquid pressure is excessive causes that telescopic oil cylinder built-in core pipe generation buckling destroys, need again to ensure that oil liquid pressure is large enough to realize band load and stretches out, therefore, A side secondary overflow valve 13 is set between the first actuator port A of reversal valve 12 and the oil return inlet T of reversal valve 12.

For increasing hydraulic system damping by overflow, reduce pressure oscillation when retracting and utilize load deadweight to realize arm retraction, thus improving robust motion, reducing energy consumption, need again to ensure that oil liquid pressure is large enough to realize unloaded retraction, therefore, B side secondary overflow valve 14 is set between the second actuator port B of reversal valve 12 and the oil return inlet T of reversal valve 12.

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

Extension and contraction control connection 1 is three clematis stem hand-operated direction valves, when at the first working position, pressure oil port P oil-feed, pressure oil oil duct bottom the first actuator port A, balanced valve the 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, and the first telescopic oil cylinder 3 stretches out；

First telescopic oil cylinder 3 stretches out and puts in place, first rodless cavity 33 oil liquid pressure raises, the setting pressure reaching the first pressure-compensated valve 62 stretches out resistance sum with the second telescopic oil cylinder, open the first pressure-compensated valve 62, pressure oil oil duct bottom the 7th actuator port A4, the first actuator port A5 of 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, and the second telescopic oil cylinder 4 stretches out；

Second telescopic oil cylinder 4 stretches out and puts in place, second rodless cavity 43 oil liquid pressure raises, reach the unlatching pressure of the 3rd pressure-compensated valve 72,3rd pressure-compensated valve 72 is opened, pressure oil enters the 3rd rodless cavity 53 of 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, and the 3rd telescopic oil cylinder 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, balanced valve 2, second actuator port B of reversal valve 12, oil return inlet T oil sump tank.

Extension and contraction control connection 1 is switched to the second working position of reversal valve 12, and by the pressure oil port P oil-feed of reversal valve 12, pressure oil is through the second actuator port B of reversal valve 12, balanced valve 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 3rd rod chamber 52, and the oil return of the 3rd rodless cavity 53 is through the second actuator port A10 of the 3rd telescopic oil cylinder 5, 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, balanced valve 2, first actuator port A of reversal 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, open pressure due to the 4th pressure-compensated valve 73 to retract resistance difference more than the 3rd telescopic oil cylinder 5 and the second telescopic oil cylinder 4, second pressure-compensated valve 63 is opened pressure and is retracted resistance difference more than the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3, and second, four pressure-compensated valves are unopened, and first, the rodless cavity oil return line of two telescopic oil cylinders is cut off, and only the 3rd telescopic oil cylinder is retracted；

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 unlatching force value sum that the retraction resistance difference of the 3rd telescopic oil cylinder 5 and the second telescopic oil cylinder 4 sets with the 4th pressure-compensated valve 73, 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, balanced valve 2, first actuator port A of reversal valve 12, oil return inlet T oil sump tank, second cylinder body 44 is retracted under the effect of pressure oil, now, owing to the second pressure compensation valve opening pressure is retracted resistance difference more than the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3, and its unlatching pressure is more 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 the second telescopic oil cylinder is retracted；

Second cylinder body 44 is retracted and is put in place, second rod chamber 42 oil liquid pressure raises, when the retraction resistance difference that oil liquid pressure reaches the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3 opens pressure sum with the second pressure-compensated valve 63, 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, balanced valve 2, first actuator port A of reversal 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 above-mentioned hydraulic control system controlling triplex sequential telescopic.A specific embodiment of provided by the invention suspension arm mechanism is set forth below.As in figure 2 it is shown, fixed arm I, multi-stage telescopic arms, retraction drag-line 8 and many groups stretch out drawing cable mechanism, also include, the above-mentioned hydraulic control system controlling triplex 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 used for the telescopic arm that bounces back, and stretches out drawing cable mechanism for stretching out telescopic arm, and multi-stage telescopic arms is set in sequence in previous telescopic arm successively, and can stretch out previous telescopic arm；

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

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

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

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

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

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

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

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

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

3rd telescopic oil cylinder 5 drives the synchronization of Section of three telescopic arm IV and more than Section three telescopic arm stretch out and retract by two groups and the above drawing cable mechanism that stretches out with retraction drag-line 8.

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

Being provided with first segment telescopic arm II in fixed arm I, first segment telescopic arm II can bounce back in fixed arm I, and can stretch out fixed arm I；Arranging second section telescopic arm III in first segment telescopic arm II, second section telescopic arm III can bounce back in first segment telescopic arm II, and can stretch out first segment telescopic arm II；Being provided with Section of three telescopic arm IV in second section telescopic arm III, Section of three telescopic arm IV can bounce back in second section telescopic arm III, and can stretch out second section telescopic arm III；Section three, in telescopic arm IV, it is provided with Section of four telescopic arm V, section four, telescopic arm V can bounce back in Section of three telescopic arm IV, and can stretching out Section of three telescopic arm IV, Section of five telescopic arm VI can bounce back in Section of four telescopic arm V, and can stretch out Section of four telescopic arm V.

Controlling being set to of the first telescopic oil cylinder 3 in the hydraulic control system of triplex sequential telescopic: the first piston bar 31 of the first telescopic oil cylinder 3 is fixing with fixed arm I to be connected, the first cylinder body 37 of the first telescopic oil cylinder 3 is fixing with first segment telescopic arm II to be connected.

Controlling being set to of the second telescopic oil cylinder 4 in the hydraulic control system of triplex sequential telescopic: the second piston rod 41 of the second telescopic oil cylinder 4 is fixing with first segment telescopic arm II to be connected, the second cylinder body 46 of the second telescopic oil cylinder 4 is fixing with second section telescopic arm III to be connected.

Controlling being set to of the 3rd telescopic oil cylinder 5 in the hydraulic control system of triplex sequential telescopic: the 3rd piston rod 51 of the 3rd telescopic oil cylinder 5 is fixing with second section telescopic arm III to be connected, the 3rd cylinder body 54 of the 3rd telescopic oil cylinder 5 is fixing with Section of three telescopic arm IV to be connected.

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

Be can be seen that by Fig. 1 and Fig. 2, first actuator port A1 of balanced valve 2 and the first telescopic oil cylinder 3, second actuator port B1 of balanced valve 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, 3rd actuator port B7 of the 6th actuator port B6 and the three telescopic oil cylinder of the second telescopic oil cylinder 4, the first actuator port A9 etc. of the 7th actuator port A8 and the three telescopic oil cylinder of the second telescopic oil cylinder 4 needs hydraulic fluid port or the parts geo-stationary between two that pipeline connects.Therefore, extension and contraction control connection 1, between balanced valve the 2, first telescopic oil cylinder the 3, second telescopic oil cylinder the 4, the 3rd telescopic oil cylinder the 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 prone to arrange, take up room little, reliability high, it is adaptable to the construction features that the internally installed space of suspension arm mechanism of straight-arm vehicle mounted type crane is little, maintenance loading and unloading amount is big.

The work process of the suspension arm mechanism adopting the hydraulic control system controlling triplex sequential telescopic provided in examples detailed above of the present invention, specific as follows:

1, extending action: extension and contraction control connection 1 is switched to the first working position of reversal valve 12, the pressure oil port P oil-feed of reversal valve 12, pressure oil oil duct bottom the first actuator port A of reversal valve 12, balanced valve the 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, second check valve 62 is opened, pressure oil enters the first rodless cavity 33, and the first telescopic oil cylinder 3 stretches out；

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

After the second telescopic oil cylinder 4 reaches stroke, if reversal valve 12 is still at the first working position, oil liquid pressure continues to raise, reach the unlatching pressure of the 3rd pressure-compensated valve 72,3rd pressure-compensated valve 72 is opened, pressure oil enters the 3rd rodless cavity 53 of 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, and the 3rd telescopic oil cylinder 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, balanced valve 2, second actuator port B of reversal 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.So, triplex stretches out successively, drives each joint arm to stretch out accordingly, just completes order and stretches out.

2, retract action: extension and contraction control connection 1 is switched to the second working position of reversal valve 12, and by the pressure oil port P oil-feed of reversal valve 12, pressure oil is through the second actuator port B of reversal valve 12, balanced valve 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 3rd rod chamber 52, and the oil return of the 3rd rodless cavity 53 is through the second actuator port A10 of the 3rd telescopic oil cylinder 5, 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, balanced valve 2, first actuator port A of reversal 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, open pressure due to the 4th pressure-compensated valve 73 to retract resistance difference more than the 3rd telescopic oil cylinder 5 and the second telescopic oil cylinder 4, second pressure-compensated valve 63 is opened pressure and is retracted resistance difference more than the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3, and second, four pressure-compensated valves are unopened, and first, the rodless cavity oil return line of two telescopic oil cylinders is cut off, and only the 3rd telescopic oil cylinder is retracted；

If the 3rd cylinder body 54 retract put in place after reversal valve 12 still at the second working position, oil liquid pressure continues to raise, when oil liquid pressure reaches the unlatching force value sum that the retraction resistance difference of the 3rd telescopic oil cylinder 5 and the second telescopic oil cylinder 4 sets with the 4th pressure-compensated valve 73, 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, balanced valve 2, first actuator port A of reversal valve 12, oil return inlet T oil sump tank, second cylinder body 44 is retracted under the effect of pressure oil, now, owing to the second pressure compensation valve opening pressure is retracted resistance difference more than the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3, and its unlatching pressure is more 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 the second telescopic oil cylinder is retracted；

Second cylinder body 44 is retracted after putting in place, if reversal valve 12 is still at the second working position, oil liquid pressure continues to raise, when the retraction resistance difference that oil liquid pressure reaches the second telescopic oil cylinder 4 and the first telescopic oil cylinder 3 opens pressure sum with the second pressure-compensated valve 63, 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, balanced valve 2, first actuator port A of reversal 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；So, triplex is retracted successively, drives each joint arm to retract accordingly, just completes order retraction.

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

Crane provided by the invention includes above-mentioned suspension arm mechanism provided by the invention, and above-mentioned suspension arm mechanism includes the above-mentioned hydraulic control system controlling triplex sequential telescopic provided by the invention.Crane provided by the invention can be straight-arm lorry-mounted crane.

Above description is only example of the present invention, is not intended that any limitation of the invention.Obviously for those skilled in the art; after understanding present invention and principle; all it is likely to when without departing substantially from the principle of the invention, structure; carry out the various amendments in form and details and change, but these based on the correction of this thought and change still within the claims of the present invention.

Claims

1. control the hydraulic control system of triplex sequential telescopic, it is characterised in that: include extension and contraction control connection (1), balanced valve (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) be used for switching pressure oil direction, it is achieved to the first telescopic oil cylinder (3), the second telescopic oil cylinder (4), the 3rd telescopic oil cylinder (5) expanding-contracting action control；

Balanced valve (2) is used 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), is used for controlling the sequence of movement between the first telescopic oil cylinder (3) and the second telescopic oil cylinder (4)；

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

Extension and contraction control connection (1), balanced valve (2), the first telescopic oil cylinder (3) are connected by oil circuit successively order, described first check valve group (6) is fixing with the first telescopic oil cylinder (3) to be connected, and passes through oil communication between described first check valve group (6) and 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 fixing with the second check valve group (7) to be connected, 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 by oil circuit and the second telescopic oil cylinder (4), the second check valve group (7) connection；

Described extension and contraction control connection (1) includes A side secondary overflow valve (13), B side secondary overflow valve (14)；

First telescopic oil cylinder (3) is the version of built-in core pipe, and the first telescopic oil cylinder (3) includes 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, including 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) includes 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) includes the 5th check valve (71), the 3rd pressure-compensated valve (72), the 4th pressure-compensated valve (73) and the 6th check valve (74)；

Balanced valve (2), the first telescopic oil cylinder (3), the second telescopic oil cylinder (4), the 3rd telescopic oil cylinder (5) all 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 includes 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 the first actuator port, check valve group the second actuator port, check valve group the 3rd actuator port；

Described extension and contraction control connection (1) also includes the first check valve (11), reversal valve (12)；

Balanced valve (2) includes the first overflow valve (21), the second check valve (22) and choke valve (23)；

3rd telescopic oil cylinder (5) includes 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).

2. the hydraulic control system of control triplex sequential telescopic according to claim 1, it is characterised in that:

Described reversal valve (12) is provided with pressure oil port (P), oil return opening (T), reversal valve the first actuator port (A), reversal valve the second actuator port (B) and middle position oil return opening；The pressure oil port (P) of reversal valve (12) connects with in-line, and the first check valve (11) is arranged on in-line, and the oil-out of the first check valve (11) connects with the pressure oil port (P) of reversal valve (12)；The oil return opening (T) of reversal valve (12) connects with fuel tank, and reversal valve the first actuator port (A) connects with first actuator port (C1) of balanced valve (2), and reversal valve the second actuator port (B) connects with second actuator port (C2) of balanced valve (2)；On the oil circuit that reversal valve the first actuator port (A) connects with first actuator port (C1) of balanced valve (2), side connects A side secondary overflow valve (13), the oil-out of A side secondary overflow valve (13) connects with fuel tank, on the oil circuit that reversal valve the second actuator port (B) connects with second actuator port (C2) of balanced valve (2), side connects B side secondary overflow valve (14), and the oil-out of B side secondary overflow valve (14) connects with fuel tank；

First actuator port (C1) of balanced valve connects with reversal valve the first actuator port (A), and second actuator port (C2) of balanced valve connects with reversal valve the second actuator port (B)；3rd actuator port (C3) of balanced valve (2) directly connects with first actuator port (A1) of the first telescopic oil cylinder；4th actuator port (C4) of balanced valve (2) directly connects with second actuator port (B1) of the first telescopic oil cylinder (3)；

First overflow valve (21) and the second check valve (22) are arranged between first actuator port (C1) of balanced valve (2) and the 3rd actuator port (C3) of balanced valve (2), the oil-in of the first overflow valve (21) connects with the 3rd actuator port (C3) of balanced valve (2), and the oil-out of the first overflow valve (21) connects with first actuator port (C1) of balanced valve (2)；The oil-in of the second check valve (22) connects with first actuator port (C1) of balanced valve (2), the oil-out of the second check valve (22) connects with the 3rd actuator port (C3) of balanced valve (2), second actuator port (C2) of balanced valve (2) connects with the 4th actuator port (C4), the upper other one end connecing choke valve (23) of first overflow valve (21), the oil circuit between the second actuator port (C2) and the 4th actuator port (C4) of other end connection balanced valve (2) of choke valve (23)；

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

The check valve group the first actuator port (D1) of the first check valve group (6) connects with the 3rd actuator port (A2) of the first telescopic oil cylinder (3), the check valve group the second actuator port (D2) of the first check valve group (6) connects 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) connects with the 7th actuator port (A4) of the first telescopic oil cylinder (3)；

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

The check valve group the first actuator port (D4) of the second check valve group (7) connects with the 3rd actuator port (A6) of the second telescopic oil cylinder (4), the check valve group the second actuator port (D5) of the second check valve group (7) connects 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) connects with the 7th actuator port (A8) of the second telescopic oil cylinder (4).

3. the hydraulic control system of control triplex sequential telescopic according to claim 2, it is characterised in that

First pressure-compensated valve (62) of the first check valve group (6) is opened pressure and is stretched out resistance difference more than the first telescopic oil cylinder (3) and the second telescopic oil cylinder (4)；

3rd pressure-compensated valve (72) of the second check valve group (7) is opened pressure and is stretched out resistance difference more than the second telescopic oil cylinder (4) and the 3rd telescopic oil cylinder (5)；

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

4. the hydraulic control system of control triplex sequential telescopic according to claim 2, it is characterized in that, reversal valve (12) is provided with the first working position, the second working position and the 3rd working position, reversal valve (12) is when the first working position, pressure oil port (P), oil return opening (T), reversal valve the first actuator port (A), reversal valve the second actuator port (B) all do not connect each other, by position oil return opening oil sump tank in the pressure oil process that pressure oil port (P) enters；Reversal valve (12) is when the second working position, pressure oil port (P) connects with reversal valve the first actuator port (A), oil return inlet T connects with reversal valve the second actuator port (B), reversal valve (12) is when three working positions, pressure oil port (P) connects with reversal valve the second actuator port (B), and oil return opening (T) connects with reversal valve the first actuator port (A).

5. the hydraulic control system of control triplex sequential telescopic according to claim 2, it is characterized in that, the check valve group the first actuator port (D4) of the second check valve group (7) is freely connected to the fluid in check valve group the second actuator port (D5) direction by the 6th check valve (74)；Check valve group the first actuator port (D4) connection of the oil-out of the 3rd check valve (71) and the oil-in of the 3rd pressure-compensated valve (72) and the second check valve group (7)；Check valve group the 3rd actuator port (D6) connection of the oil-in of the 5th check valve (71) and the oil-out of the 3rd pressure-compensated valve (72) and the second check valve group (7)；Check valve group the first actuator port (D4) connection of the oil-in of the 6th check valve (74) and the oil-out of the 4th pressure-compensated valve (73) and the second check valve group (7)；Check valve group the second actuator port (D5) connection of the oil-out of the 6th check valve (74) and the oil-in of the 4th pressure-compensated valve (73) and the second check valve group (7).

6. the hydraulic control system of control triplex sequential telescopic according to claim 2, it is characterised in that described A side secondary overflow valve (13) is arranged between the oil return opening (T) of reversal valve the first actuator port (A) and reversal valve (12)；Described B side secondary overflow valve (14) is arranged between the oil return opening (T) of reversal valve the second actuator port (B) and reversal valve (12).

7. the hydraulic control system of control triplex sequential telescopic according to claim 2, it is characterised in that described reversal 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.

8. a suspension arm mechanism, stretches out drawing cable mechanism including fixed arm (I), multi-stage telescopic arms, retraction drag-line (8) and many groups, it is characterised in that also include, the hydraulic control system controlling triplex sequential telescopic as described in any one of claim 1-7；

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

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

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

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

9. a kind of suspension arm mechanism according to claim 8, it is characterised in that described multi-stage telescopic arms includes n and saves telescopic arm, described many groups are stretched out drawing cable mechanism and include n-3 group and stretch out drawing cable mechanism, and n is be more than or equal to 3.

10. a crane, it is characterised in that include a kind of suspension arm mechanism as described in claim 8 or 9.