CN104591014A - Telescopic cylinder, landing leg control system and crane - Google Patents

Telescopic cylinder, landing leg control system and crane Download PDF

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Publication number
CN104591014A
CN104591014A CN201410691457.1A CN201410691457A CN104591014A CN 104591014 A CN104591014 A CN 104591014A CN 201410691457 A CN201410691457 A CN 201410691457A CN 104591014 A CN104591014 A CN 104591014A
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CN
China
Prior art keywords
piston
port
valve
cylinder
telescoping cylinder
Prior art date
Application number
CN201410691457.1A
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Chinese (zh)
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CN104591014B (en
Inventor
蒋浩中
Original Assignee
中联重科股份有限公司
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Priority to CN201410691457.1A priority Critical patent/CN104591014B/en
Publication of CN104591014A publication Critical patent/CN104591014A/en
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Publication of CN104591014B publication Critical patent/CN104591014B/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/16Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62Constructional features or details
    • B66C23/72Counterweights or supports for balancing lifting couples
    • B66C23/78Supports, e.g. outriggers, for mobile cranes
    • B66C23/80Supports, e.g. outriggers, for mobile cranes hydraulically actuated
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/021Valves for interconnecting the fluid chambers of an actuator
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/027Check valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1409Characterised by the construction of the motor unit of the straight-cylinder type with two or more independently movable working pistons
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • F15B15/1447Pistons; Piston to piston rod assemblies
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20Other details, e.g. assembly with regulating devices
    • F15B15/24Other details, e.g. assembly with regulating devices for restricting the stroke

Abstract

The invention provides a telescopic cylinder, a landing leg control system and a crane. The telescopic cylinder includes a main barrel body having an inner cavity passing to an axial second end of the main barrel body from an axial first end of the main barrel body; a first piston assembly movably arranged in the inner cavity along the axial direction of the main barrel body and having a first extending-out end extending out from the axial first end of the main barrel body; and a second piston assembly movably arranged in the inner cavity along the axial direction of the main barrel body and having a second extending-out end extending out from the axial second end of the main barrel body. The inner cavity is divided into a first chamber body, a middle chamber body and a second chamber body by the first piston assembly and the second piston assembly along the axial first end to the axial second end; the main barrel body is provided with a first fluid through port communicated with the middle chamber body, the first extending-out end is provided with a second fluid through port having a communication state with the first chamber body, the second extending-out end is provided with a third fluid through port having a communication state with the second chamber body. The telescopic cylinder solves the problem of relatively complex telescopic structure.

Description

Telescoping cylinder, leg control system and hoisting crane

Technical field

The present invention relates to engineering machinery field, more specifically, relate to a kind of telescoping cylinder, leg control system and hoisting crane.

Background technology

In the prior art, the construction machinery and equipment of H type supporting leg all adopts the arrangement stacked before and after the supporting leg of left and right, movable supporting legs in this arrangement generally adopts complicated telescoping mechanism, use roller head, stretch out steel rope, the parts such as steel rope of pulling back, by the coiling of complexity, the control that regulates installation steps could realize supporting leg.

Generally, supporting leg action have left frontly to stretch, left front contracting, right frontly to stretch, right front contracting, left backly to stretch, left back contracting, right backly to stretch, the action of right back contracting, move along the Width of car body the overall width changing whole equipment by the supporting leg controlling car body both sides, the stability of raising equipment, everything all passes through special key mapping on supporting leg control capsule and handles realization, the control valve member of the supporting leg in this mode is more, and oil pipe is also more.

Having the equipment of compact form demand, especially on chassis, the arrangement stacked before and after supporting leg can to other parameters on chassis, as angle of attach, departure angle cause very large impact; Further, the stretching structure controlled supporting leg is complicated, especially employs wire rope winding mechanism, and assembly technology can be caused complicated, and assembling difficulty is large, and later maintenance demand is many, the problem that trouble point is many.

In the prior art, each supporting leg action has proprietary key mapping on supporting leg control capsule, and valve member is many, pipeline is many, and controller is relatively costly, and especially on low cost compact platform, cost pressure is larger.Visible, the control stretching structure to movable supporting legs of the prior art is comparatively complicated, cost is higher, can have a strong impact on the structural compactness of integral device.

Summary of the invention

The present invention aims to provide a kind of telescoping cylinder, leg control system and hoisting crane, to solve the comparatively complicated problem of the stretching structure controlled supporting leg of the prior art.

For solving the problems of the technologies described above, according to a first aspect of the invention, providing a kind of telescoping cylinder, comprising: main cylinder, there is the inner chamber passing to axially the second end from the axial first end of main cylinder; First piston assembly, being axially movably arranged in inner chamber along main cylinder, and there is the first external part stretched out from the axial first end of main cylinder; Second piston component, being axially movably arranged in inner chamber along main cylinder, and there is the second external part stretched out from axis second end of main cylinder; Wherein, first piston assembly and the second piston component by inner chamber vertically first end to axial the second end be divided into the first cavity, middle chamber and the second cavity successively, main cylinder is provided with the first fluid port be communicated with middle chamber, first external part is provided with the second fluid port with the first cavity with connected state, the second external part is provided with the 3rd fluid port with the second cavity with connected state.

Further, first piston assembly and the second piston component include multi-level piston sheathed successively, every grade of piston includes piston body and hollow piston rod, the piston body of the piston of outermost one-level and main cylinder bearing fit, the piston body of other pistons at different levels be upper class piston hollow piston rod and with the piston body bearing fit of upper class piston; Wherein, second fluid port is arranged on the hollow piston rod of the piston of inner side of first piston assembly, and the 3rd fluid port arranges with on the hollow piston rod of the piston of the inner side of the second piston component; The hollow piston rod of piston at different levels all offers through flow hole, and except the piston of inner side, the piston body of piston at different levels is provided with intercommunicating pore.

Further, intercommunicating pore comprise stretch out intercommunicating pore and retraction intercommunicating pore, stretch out in intercommunicating pore and be provided with pressure-gradient control valve group, when the fluid pressure of side of the close middle chamber stretching out intercommunicating pore is greater than the setting pressure of pressure-gradient control valve group, the fluid stretching out the side of the close middle chamber of intercommunicating pore flows into by stretching out intercommunicating pore the opposite side stretching out intercommunicating pore; Be provided with check valve in retraction intercommunicating pore, the oil inlet of check valve is communicated with the side away from middle chamber of retraction intercommunicating pore, and the oil outlet of check valve is communicated with the opposite side of retraction intercommunicating pore.

Further, the second piston component comprises the pistons at different levels with first piston assembly peer.

Further, first piston assembly comprises first piston cylinder, and one end of first piston cylinder is along the axially movably setting of main cylinder, and the other end of first piston cylinder is the first external part; Second piston component comprises the second piston barrel, and one end of the second piston barrel is along the axially movably setting of main cylinder, and the other end of the second piston barrel is the second external part; First piston assembly also comprises the 3rd piston barrel, the 3rd piston barrel being axially movably arranged in the first cavity along main cylinder, and one end away from the first external part of first piston cylinder is arranged in the 3rd piston barrel movably; Second piston component also comprises the 4th piston barrel, the 4th piston barrel being axially movably arranged in the second cavity along main cylinder, and one end away from the second external part of the second piston barrel is arranged in the 4th piston barrel movably; Wherein, the hollow piston rod of first piston cylinder is provided with the first through flow hole, the hollow piston rod of the second piston barrel is provided with the second through flow hole; The hollow piston rod of the 3rd piston barrel is provided with threeway discharge orifice, the hollow piston rod of the 4th piston barrel is provided with the 4th through flow hole.

Further, second confined planes of the first confined planes being provided with the largest motion distance limiting first piston assembly in main cylinder and the largest motion distance limiting the second piston component, first fluid port is arranged on the main cylinder between the first confined planes and the second confined planes.

Provide a kind of leg control system according to a second aspect of the invention, comprise: telescoping cylinder, telescoping cylinder is above-mentioned telescoping cylinder, and hollow piston rod one end of first stage piston, inner side of the first piston assembly of telescoping cylinder drives with the supporting leg of the body side in construction machinery and equipment and is connected, the second piston component of telescoping cylinder inside the hollow piston rod of first stage piston drive with the respective leg of body opposite side and be connected.

Further, leg control system also comprises: flexible transfer valve, flexible transfer valve comprises oil inlet, oil outlet, the first actuator port and the second actuator port, and flexible transfer valve comprises primary importance and the second place, in the primary importance of flexible transfer valve, oil inlet is communicated with the first actuator port, and oil outlet is communicated with the second actuator port; In the second place of flexible transfer valve, oil inlet is communicated with the second actuator port, and oil outlet is communicated with the first actuator port; Wherein, oil inlet is connected with Hydraulic Pump, and oil outlet is connected with petrol storage tank, and the first actuator port is connected with the first fluid port of telescoping cylinder, and second fluid port and the 3rd fluid port of the second actuator port and telescoping cylinder are connected.

Further, leg control system also comprises: the first shutoff valve, and the first shutoff valve is arranged on to connect and stretches on the hydraulic tubing of the second actuator port of transfer valve and the second fluid port of telescoping cylinder; Second shutoff valve, the second shutoff valve is arranged on to connect and stretches on the hydraulic tubing of the second actuator port of transfer valve and the 3rd fluid port of telescoping cylinder.

Further, leg control system comprises multiple telescoping cylinder, and multiple telescoping cylinder be arranged in parallel along the axial direction of body, and multiple telescoping cylinder is connected in parallel.

Further, the first point of connection is formed between the second fluid port of each telescoping cylinder, the second point of connection is formed between 3rd fluid port of each telescoping cylinder, and hydraulic tubing between the second fluid port of each telescoping cylinder and the first point of connection is provided with the first shutoff valve, the hydraulic tubing between the 3rd fluid port of each telescoping cylinder and the second point of connection is provided with the second shutoff valve.

Further, leg control system also comprises telescoping cylinder and selects control cock group, and telescoping cylinder selects control cock group to be arranged between the first actuator port of flexible transfer valve and the first fluid port of each telescoping cylinder, for controlling the oil circuit break-make of each telescoping cylinder.

Further, telescoping cylinder selects control cock group to comprise: the first action transfer valve, first action transfer valve comprises oil-feed valve port, the first work valve port and the second work valve port, and the first action transfer valve comprises primary importance, the second place and the 3rd position, in the primary importance of the first action transfer valve, oil-feed valve port and first valve port that works is communicated with; In the second place of the first action transfer valve, oil-feed valve port and first valve port and second valve port that works that works all is communicated with; In the 3rd position of the first action transfer valve, oil-feed valve port and second valve port that works is communicated with; Wherein, oil-feed valve port is connected with the first actuator port of flexible transfer valve, and the first work valve port is connected with the first fluid port of the telescoping cylinder being positioned at front part of a body, and the second work valve port is connected with the first fluid port of the telescoping cylinder being positioned at After-Body.

Further, leg control system also comprises supporting leg and selects control cock group, supporting leg selects control cock group to be arranged on the second actuator port of flexible transfer valve and between the second fluid port of each telescoping cylinder and the 3rd fluid port, for controlling the break-make of the side of each telescoping cylinder.

Further, supporting leg selector valve group also comprises: the second action transfer valve, second action transfer valve comprises oil-feed port, the first work port and the second work port, and the second action transfer valve comprises primary importance, the second place and the 3rd position, in the primary importance of the second action transfer valve, oil-feed port and first port that works is communicated with; In the second place of the second action transfer valve, oil-feed port and first port and second port that works that works all is communicated with; In the 3rd position of the second action transfer valve, oil-feed port and second port that works is communicated with; Wherein, oil-feed port is connected with the second actuator port of flexible transfer valve, and the first work port is connected with the second fluid port of telescoping cylinder, and the second work port is connected with the 3rd fluid port of telescoping cylinder.

According to a third aspect of the present invention, provide a kind of hoisting crane, comprise body and the supporting leg being arranged on body both sides, hoisting crane also comprises: leg control system, the two ends of the telescoping cylinder in leg control system drive with the supporting leg of body side respectively and are connected, and leg control system is above-mentioned leg control system.

Telescoping cylinder in the present invention comprises main cylinder, first piston assembly and the second piston component, main cylinder is provided with first fluid port, first piston assembly is provided with second fluid port, second piston component is provided with the 3rd fluid port, and, one end of first piston assembly is arranged in the first cavity movably, and one end of the second piston component is arranged in the second cavity movably.

Visible, when passing into fluid to first fluid passage port, fluid enters in middle chamber, pressure increase in middle chamber, promotion first piston assembly and the second piston component move towards the outside of main cylinder, fluid in fluid in first cavity and the second cavity flows out respectively by the 3rd fluid port on the second fluid port of first piston assembly and the second piston component, so make first piston assembly and the second piston component protruding.

When passing into fluid to second fluid port and the 3rd fluid passage port, fluid enters in first piston assembly and the second piston component, and flow out first piston assembly from the through flow hole of first piston assembly and act on the piston body be connected with main cylinder of first piston assembly, flow out the second piston component from the through flow hole of the second piston component and act on the piston body be connected with main cylinder of the second piston component, pressure in first cavity and the second cavity is larger, fluid in middle chamber flows out from first fluid port, first piston group and the second piston group are moved to the inside of main cylinder, and then first piston group and the second piston group are inwardly shunk.

Telescoping cylinder structure in the present invention is simple, with low cost, compact conformation, control is simple, reliability is higher, effectively can solve the application difficult problem of existing H type supporting leg on compact platform, solve the problem that the stretching structure controlled supporting leg of the prior art is comparatively complicated.

Accompanying drawing explanation

The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.

In the accompanying drawings:

Fig. 1 diagrammatically illustrates the structural representation of the telescoping cylinder in the present invention;

Fig. 2 diagrammatically illustrates the reduced graph of the telescoping cylinder in Fig. 1;

Fig. 3 diagrammatically illustrates the structural representation that first piston in telescoping cylinder and the second piston stretch out;

Fig. 4 diagrammatically illustrates the structural representation that the 3rd piston in telescoping cylinder and the 4th piston stretch out;

Fig. 5 diagrammatically illustrates the structural representation of the first pressure-gradient control valve group in telescoping cylinder or the second pressure-gradient control valve group;

Fig. 6 diagrammatically illustrates the structural representation of the leg control system in first embodiment;

Fig. 7 diagrammatically illustrates the structural representation of the leg control system in second embodiment;

Fig. 8 diagrammatically illustrates the structural representation of the leg control system in the 3rd embodiment;

Fig. 9 diagrammatically illustrates the structural representation of flexible transfer valve;

Figure 10 diagrammatically illustrates the structural representation of the first action transfer valve or the second action transfer valve; And

Figure 11 diagrammatically illustrates the structural representation of hoisting crane.

Reference numeral in figure:

10, main cylinder; 11, the first cavity; 12, the second cavity; 13, middle chamber; 14, first fluid port; 15, defining flange; 20, first piston cylinder; 21, second fluid port; 22, the first through flow hole; 30, the second piston barrel; 31, the 3rd fluid port; 32, the second through flow hole; 40, the 3rd piston barrel; 41, threeway discharge orifice; 42, first stretches out intercommunicating pore; 43, the first pressure-gradient control valve group; 44, the first check valve; 45, the first elastic component; 46, the first retraction intercommunicating pore; 47, the 3rd check valve; 50, the 4th piston barrel; 51, the 4th through flow hole; 52, second stretches out intercommunicating pore; 53, the second pressure-gradient control valve group; 54, the second check valve; 55, the second elastic component; 56, the second retraction intercommunicating pore; 57, the 4th check valve; 60, flexible transfer valve; 61, oil inlet; 62, oil outlet; 63, the first actuator port; 64, the second actuator port; 65, Hydraulic Pump; 66, petrol storage tank; 71, the first shutoff valve; 72, the second shutoff valve; 80, the first action transfer valve; 81, oil-feed valve port; 82, the first work valve port; 83, the second work valve port; 90, the second action transfer valve; 91, oil-feed port; 92, the first work port; 93, the second work port; 100, body; 200, supporting leg.

Detailed description of the invention

Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.

According to an aspect of the present invention, provide a kind of telescoping cylinder, please refer to Fig. 1 to Figure 10, this telescoping cylinder comprises: main cylinder 10, has the inner chamber passing to axially the second end from the axial first end of main cylinder 10; First piston assembly, along being axially movably arranged in inner chamber of main cylinder 10, and has the first external part stretched out from the axial first end of main cylinder 10; Second piston component, along being axially movably arranged in inner chamber of main cylinder 10, and has the second external part stretched out from axis second end of main cylinder 10; Wherein, first piston assembly and the second piston component by inner chamber vertically first end to axial the second end be divided into the first cavity 11, middle chamber 13 and the second cavity 12 successively, main cylinder 10 is provided with the first fluid port 14 be communicated with middle chamber 13, first external part is provided with second fluid port 21, second external part with the first cavity 11 with connected state and is provided with the 3rd fluid port 31 with the second cavity 12 with connected state.

Telescoping cylinder in the present invention comprises main cylinder 10, first piston assembly and the second piston component, main cylinder 10 is provided with first fluid port 14, first piston assembly is provided with second fluid port 21, second piston component is provided with the 3rd fluid port 31, and, one end of first piston assembly is arranged in the first cavity 11 movably, and one end of the second piston component is arranged in the second cavity 12 movably.

Visible, when passing into fluid to first fluid port 14 place, fluid enters in middle chamber 13, pressure increase in middle chamber 13, promotion first piston assembly and the second piston component move towards the outside of main cylinder 10, fluid in fluid in first cavity 11 and the second cavity 12 flows out respectively by the 3rd fluid port 31 on the second fluid port 21 of first piston assembly and the second piston component, so make first piston assembly and the second piston component protruding.

When passing into fluid to second fluid port 21 and the 3rd fluid port 31 place, fluid enters in first piston assembly and the second piston component, and flow out first piston assembly from the through flow hole of first piston assembly and act on the piston body be connected with main cylinder 10 of first piston assembly, flow out the second piston component from the through flow hole of the second piston component and act on the piston body be connected with main cylinder 10 of the second piston component, pressure in first cavity 11 and the second cavity 12 is larger, fluid in middle chamber 13 flows out from first fluid port 14, first piston group and the second piston group are moved to the inside of main cylinder 10, and then first piston group and the second piston group are inwardly shunk.

Telescoping cylinder structure in the present invention is simple, with low cost, compact conformation, control is simple, reliability is higher, effectively can solve the application difficult problem of existing H type supporting leg on compact platform, solve the problem that the stretching structure controlled supporting leg of the prior art is comparatively complicated.

Preferably, first piston assembly and the second piston component include multi-level piston sheathed successively, every grade of piston includes piston body and hollow piston rod, the piston body of the piston of outermost one-level and main cylinder 10 bearing fit, the piston body of other pistons at different levels be upper class piston hollow piston rod and with the piston body bearing fit of upper class piston; Wherein, second fluid port 21 is arranged on the hollow piston rod of the piston of inner side of first piston assembly, and the 3rd fluid port 31 arranges with on the hollow piston rod of the piston of the inner side of the second piston component; The hollow piston rod of piston at different levels all offers through flow hole, and except the piston of inner side, the piston body of piston at different levels is provided with intercommunicating pore.

Preferably, intercommunicating pore comprise stretch out intercommunicating pore and retraction intercommunicating pore, stretch out in intercommunicating pore and be provided with pressure-gradient control valve group, when the fluid pressure of side of the close middle chamber 13 stretching out intercommunicating pore is greater than the setting pressure of pressure-gradient control valve group, the fluid stretching out the side of the close middle chamber 13 of intercommunicating pore flows into by stretching out intercommunicating pore the opposite side stretching out intercommunicating pore; Be provided with check valve in retraction intercommunicating pore, the oil inlet of check valve is communicated with the side away from middle chamber 13 of retraction intercommunicating pore, and the oil outlet of check valve is communicated with the opposite side of retraction intercommunicating pore.Preferably, pressure-gradient control valve group is the check valve of band response pressure, namely pressure-gradient control valve group is made up of elastic component and common check valve, wherein, the oil inlet of check valve is communicated with middle chamber 13, the oil outlet of check valve is communicated with the side away from middle chamber 13 of flexible intercommunicating pore, and this check valve abuts with elastic component.

Preferably, the second piston component comprises the pistons at different levels with first piston assembly peer.

Preferably, first piston assembly comprises first piston cylinder 20, one end of first piston cylinder 20 is along the axially movably setting of main cylinder 10, and the other end of first piston cylinder 20 is the first external part, second piston component comprises the second piston barrel 30, one end of second piston barrel 30 is along the axially movably setting of main cylinder 10, and the other end of the second piston barrel 30 is the second external part; First piston assembly also comprises the 3rd piston barrel the 40, three piston 40 being axially movably arranged in the first cavity 11 along main cylinder 10, and one end away from the first external part of first piston cylinder 20 is arranged in the 3rd piston barrel 40 movably; Second piston component also comprises the 4th piston barrel the 50, four piston barrel 50 being axially movably arranged in the second cavity 12 along main cylinder 10, and one end away from the second external part of the second piston barrel 30 is arranged in the 4th piston barrel 50 movably; Wherein, the hollow piston rod hollow piston rod of first piston cylinder 20 being provided with the first through flow hole 22, second piston barrel 30 is provided with the second through flow hole 32; Hollow piston rod on 3rd piston barrel 40 is provided with threeway discharge orifice 41, the hollow piston rod of the 4th piston barrel 50 is provided with the 4th through flow hole 51.Preferably, first piston cylinder 20 to the 4th piston barrel 50 includes cylinder body and is arranged on the base of described cylinder base, first piston cylinder 20 is connected with the inner wall sealing of the 3rd piston barrel 40 or the 4th piston barrel 50 respectively by respective base with the second piston barrel 30, and the 3rd piston barrel 40 is connected with main cylinder 10 respectively by respective base with the 4th piston barrel 50.Preferably, first piston cylinder 20 is all provided with seal ring to the base of the 4th piston barrel 50.

Preferably, second confined planes of the first confined planes being provided with the largest motion distance limiting first piston assembly in main cylinder 10 and the largest motion distance limiting the second piston component, first fluid port 14 is arranged on the main cylinder 10 between the first confined planes and the second confined planes.Preferably, one end of the close middle chamber 13 of the 3rd piston barrel 40 is provided with first and stretches out intercommunicating pore 42, and first stretches out in intercommunicating pore 42 and be provided with the first pressure-gradient control valve group 43; Wherein, when the fluid pressure in middle chamber 13 is greater than the setup pressure value of the first pressure-gradient control valve group 43, the fluid in middle chamber 13 stretches out intercommunicating pore 42 by first and flows in the 3rd piston barrel 40; One end of the close middle chamber 13 of the 4th piston barrel 50 is provided with second and stretches out intercommunicating pore 52, and second stretches out in intercommunicating pore 52 and be provided with the second pressure-gradient control valve group 53; Wherein, when the fluid pressure in middle chamber 13 is greater than the setup pressure value of the second pressure-gradient control valve group 53, the fluid in middle chamber 13 stretches out intercommunicating pore 52 by second and flows in the 4th piston barrel 50.Stretch out intercommunicating pore 42, first pressure-gradient control valve group 43, second and stretch out intercommunicating pore 52 and the second pressure-gradient control valve group 53 by arranging first and can control stretching out of first piston cylinder 20, second piston barrel 30, the 3rd piston barrel 40 and the 4th piston barrel 50 or retraction order more easily.

Preferably, first pressure-gradient control valve group 43 comprises the first check valve 44 and the first elastic component 45, the oil inlet of the first check valve 44 is communicated with middle chamber 13, and the oil outlet of the first check valve 44 is communicated with the 3rd piston barrel 40, and the oil outlet end of the first check valve 44 abuts with the first elastic component 45; Second pressure-gradient control valve group 53 comprises the second check valve 54 and the second elastic component 55, the oil inlet of the second check valve 54 is communicated with middle chamber 13, the oil outlet of the second check valve 54 is communicated with the 4th piston barrel 50, and the oil outlet end of the second check valve 54 abuts with the second elastic component 55.Like this, only when the pressure of the first check valve 44 side is greater than the elastic force of the first elastic component 45, fluid just can flow in the 3rd piston barrel 40, and only when the pressure of the second check valve 54 side is greater than the pressure of the second elastic component 55, fluid just can flow in the 4th piston barrel 50.The effect of the first pressure-gradient control valve group 43 does not allow fluid to stretch out intercommunicating pore 42 from one end away from middle chamber 13 of the 3rd piston barrel 40 by first to flow into middle chamber 13, do not allow fluid to stretch out by first the side away from middle chamber 13 that intercommunicating pore 42 enters the 3rd piston barrel 40 from middle chamber 13 during response pressure value lower than the first pressure-gradient control valve group 43 of the pressure of the fluid in middle chamber 13.

In this application, originally from first fluid port 14 incoming fluid, first pressure-gradient control valve group 43 and the 3rd check valve 47 do not allow the fluid in middle chamber 13 to flow into the rodless cavity of the 3rd piston barrel 40, now, 3rd piston barrel 40 is pushed outwards dynamic, and first piston cylinder 20 is static relative to the 3rd piston barrel 40.When the 3rd piston barrel 40 is pushed over the end, middle chamber 13 builds the pressure, when after the response pressure value of the force value in middle chamber 13 higher than the first pressure-gradient control valve group 43, first pressure-gradient control valve group 43 conducting, fluid flows into the rodless cavity of the 3rd piston barrel 40, promote first piston cylinder 20 to move, and then the order realizing telescoping cylinder is stretched out.In like manner, the second piston barrel 30 and the 4th piston barrel 50 also carry out order with same principle and stretch out.

In addition, the retraction of two piston components also has sequencing, is entirely stretching under state, and after second fluid port 21 oil-feed, fluid enters in the rod chamber of the 3rd piston barrel 40 by the first through flow hole 22, promotes first piston cylinder 20 and bounces back.Now, due to threeway discharge orifice 41 not with the first through flow hole 22 conducting, the 3rd piston barrel 40 does not have action.When first piston cylinder 20 retraction run to threeway discharge orifice 41 expose time, threeway discharge orifice 41 and the conducting of the first through flow hole 22 ability, fluid enters in the first cavity 11, promote the 3rd piston barrel 40 to bounce back, and then the order realizing first piston cylinder 20 and the 3rd piston barrel 40 is shunk, in retraction stage, the fluid in the rodless cavity of the 3rd piston barrel 40 can enter in middle chamber 13 by passage the 3rd check valve 47.In like manner, the second piston barrel 30 and the 4th piston barrel 50 also carry out order contraction with same principle.

Preferably, one end of the close middle chamber 13 of the 3rd piston barrel 40 is provided with the first retraction intercommunicating pore 46, the 3rd check valve 47 is provided with in first retraction intercommunicating pore 46, the oil inlet of the 3rd check valve 47 is communicated with the cavity of the 3rd piston barrel 40, and the oil outlet of the 3rd check valve 47 is communicated with middle chamber 13; One end of the close middle chamber 13 of the 4th piston barrel 50 is provided with the second retraction intercommunicating pore 56, the 4th check valve 57 is provided with in second retraction intercommunicating pore 56, the oil inlet of the 4th check valve 57 is communicated with the cavity of the 4th piston barrel 50, and the oil outlet of the 4th check valve 57 is communicated with middle chamber 13.By arranging the first retraction intercommunicating pore 46 and the second retraction intercommunicating pore 56, and in the first retraction intercommunicating pore 46, the 3rd check valve 47 is installed, in the second retraction intercommunicating pore 56, the 4th check valve 57 is installed, current return circuit can be formed more easily, so that first piston cylinder 20 is retracted to the 4th piston barrel 50, and then the function that the order realizing this piston cylinder is stretched, contracted.The effect of the 3rd check valve 47 is that fluid can only be flowed in middle chamber 13 from one end away from middle chamber 13 of the 3rd piston barrel 40 by the first retraction intercommunicating pore 46, but can not counter-flow.The effect of the 4th check valve 57 makes fluid can only flow into middle chamber 13 from one end away from middle chamber 13 of the 4th piston barrel 50 by the second retraction intercommunicating pore 56, and can not counter-flow.

Preferably, be provided with defining flange 15 in main cylinder 10, the first cavity 11 and the second cavity 12 lay respectively at the corresponding side of defining flange 15.Position-limiting action can be formed to the 3rd piston barrel 40 and the 4th piston barrel 50 by arranging defining flange 15.

According to a second aspect of the invention, provide a kind of leg control system, please refer to Fig. 6 to Figure 10, this leg control system comprises: telescoping cylinder, telescoping cylinder is above-mentioned telescoping cylinder, and the inner side hollow piston rod of first stage piston of the first piston assembly of telescoping cylinder drives with the supporting leg of the body side in construction machinery and equipment and is connected, the second piston component of telescoping cylinder inside the hollow piston rod of first stage piston drive with the respective leg of body opposite side and be connected.Preferably, driving with the supporting leg of the body side in construction machinery and equipment away from one end of main cylinder 10 of first piston cylinder 20 is connected, and driving with the respective leg of the body opposite side in construction machinery and equipment away from one end of main cylinder 10 of the second piston barrel 30 is connected.

Preferably, leg control system also comprises: flexible transfer valve 60, flexible transfer valve 60 comprises oil inlet 61, oil outlet 62, first actuator port 63 and the second actuator port 64, and flexible transfer valve 60 comprises primary importance and the second place, in the primary importance of flexible transfer valve 60, oil inlet 61 is communicated with the first actuator port 63, and oil outlet 62 is communicated with the second actuator port 64; In the second place of flexible transfer valve 60, oil inlet 61 is communicated with the second actuator port 64, and oil outlet 62 is communicated with the first actuator port 63; Wherein, oil inlet 61 is connected with Hydraulic Pump 65, and oil outlet 62 is connected with petrol storage tank 66, and the first actuator port 63 is connected with the first fluid port 14 of telescoping cylinder, and second fluid port 21 and the 3rd fluid port 31 of the second actuator port 64 and telescoping cylinder are connected.

First piston cylinder 20 the stretching out or retracts to four piston barrel 50 of leg control system in the present invention by regulating flexible transfer valve 60 can control telescoping cylinder more easily, and then the stretching out or retract of supporting leg more easily on control body.

Preferably, as shown in Figure 7, leg control system also comprises: the first shutoff valve 71, first shutoff valve 71 is arranged on the second actuator port 64 of the flexible transfer valve 60 of connection with on the hydraulic tubing of the second fluid port 21 of telescoping cylinder; Second shutoff valve 72, second shutoff valve 72 is arranged on the second actuator port 64 of the flexible transfer valve 60 of connection with on the hydraulic tubing of the 3rd fluid port 31 of telescoping cylinder.By arranging the first shutoff valve 71 and the second shutoff valve 72 can control stretching out or retracting of corresponding supporting leg more easily.

Preferably, leg control system comprises multiple telescoping cylinder, and multiple telescoping cylinder be arranged in parallel along the axial direction of body, and multiple telescoping cylinder is connected in parallel.Preferably, leg control system comprises two telescoping cylinders, and telescoping cylinder is arranged on the front portion of body, and another telescoping cylinder is arranged on the rear portion of body.

Preferably, the first point of connection is formed between the second fluid port 21 of each telescoping cylinder, the second point of connection is formed between 3rd fluid port 31 of each telescoping cylinder, and hydraulic tubing between the second fluid port 21 of each telescoping cylinder and the first point of connection is provided with the first shutoff valve 71, the hydraulic tubing between the 3rd fluid port 31 of each telescoping cylinder and the second point of connection is provided with the second shutoff valve 72.

Preferably, leg control system also comprises telescoping cylinder and selects control cock group, and telescoping cylinder selects control cock group to be arranged between the first actuator port 63 of flexible transfer valve 60 and the first fluid port 14 of each telescoping cylinder, for controlling the oil circuit break-make of each telescoping cylinder.

Preferably, telescoping cylinder selects control cock group to comprise: the first action transfer valve 80, first action transfer valve 80 comprises oil-feed valve port 81, first work valve port 82 and the second work valve port 83, and the first action transfer valve 80 comprises primary importance, the second place and the 3rd position, in the primary importance of the first action transfer valve 80, oil-feed valve port 81 and first valve port 82 that works is communicated with; In the second place of the first action transfer valve 80, oil-feed valve port 81 and first valve port 82 and second valve port 83 that works that works all is communicated with; In the 3rd position of the first action transfer valve 80, oil-feed valve port 81 and second valve port 83 that works is communicated with; Wherein, oil-feed valve port 81 is connected with the first actuator port 63 of flexible transfer valve 60, first work valve port 82 is connected with the first fluid port 14 of the telescoping cylinder being positioned at front part of a body, and the second work valve port 83 is connected with the first fluid port 14 of the telescoping cylinder being positioned at After-Body.Can select the telescoping cylinder that will control more easily by arranging the first action transfer valve 80, namely can carry out action switching to front and back supporting leg more easily.

Preferably, leg control system also comprises supporting leg and selects control cock group, supporting leg selects control cock group to be arranged on the second actuator port 64 of flexible transfer valve 60 and between the second fluid port 21 of each telescoping cylinder and the 3rd fluid port 31, for controlling the break-make of the side of each telescoping cylinder.

Preferably, supporting leg selector valve group also comprises: the second action transfer valve 90, second action transfer valve 90 comprises oil-feed port 91, first work port 92 and the second work port 93, and the second action transfer valve 90 comprises primary importance, the second place and the 3rd position, in the primary importance of the second action transfer valve 90, oil-feed port 91 and first port 92 that works is communicated with; In the second place of the second action transfer valve 90, oil-feed port 91 and first port 92 and second port 93 that works that works all is communicated with; In the 3rd position of the second action transfer valve 90, oil-feed port 91 and second port 93 that works is communicated with; Wherein, oil-feed port 91 is connected with the second actuator port 64 of flexible transfer valve 60, and the first work port 92 is connected with the second fluid port 21 of telescoping cylinder, and the second work port 93 is connected with the 3rd fluid port 31 of telescoping cylinder.Action switching can be carried out to left and right supporting leg more easily by arranging the second action transfer valve 90.

According to another aspect of the present invention, provide a kind of hoisting crane, please refer to Figure 11, this hoisting crane comprises body 100 and is arranged on the supporting leg 200 of body 100 both sides, hoisting crane also comprises: leg control system, the two ends of the telescoping cylinder in leg control system drive with the supporting leg of body 100 side respectively and are connected, and leg control system is above-mentioned leg control system.

The application adopts supporting leg left and right, left and right arrangement form, goes out multi-stage expansion oil cylinder, the telescoping cylinder namely in the present invention by one pair, and drive four, left and right movable supporting legs to stretch, wherein, monolateral two-stage movable supporting legs sequential telescopic, left and right movable supporting legs stretches as required.

Specifically describe:

Article one, load two cover movable supporting legs in fixed supporting leg, arrange about two cover movable supporting legs, often overlap movable supporting legs and comprise first order movable supporting legs and secondary activity supporting leg.Secondary activity supporting leg is loaded in first order movable supporting legs, fixed supporting leg and first order movable supporting legs, mutually can slide along cylindrical shell between first order movable supporting legs and secondary activity supporting leg.

Two go out multi-stage expansion oil cylinder (telescoping cylinder namely in the present invention) be left and right Collapsible structure, be made up of an outer piston, two first stage pistons (the 3rd piston barrel 40, the 4th piston barrel 50) and two second pistons (first piston cylinder 20, second piston barrel 30), become mutually nested structure.Outer piston and second piston are all provided with installation hydraulic fluid port, and outer piston is installed hydraulic fluid port and is communicated with chamber, left and right.First stage piston is provided with two check valves, for schematic diagram oil cylinder left side stretching structure, left, response pressure value is preset as and promotes pressure needed for I and II movable supporting legs a check valve opening direction, and lower than landing leg stretching system pressure.After the oil that first fluid port 14 inputs reaches certain pressure, oil just can flow into first stage piston middle chamber from outer piston middle chamber; To the right, oil can only flow into outer piston middle chamber to a check valve installation direction from first stage piston middle chamber.Second piston and first stage piston afterbody casing wall are provided with intercommunicating pore.

Preferably, in first stage piston rod chamber and outer piston (main cylinder 10) rod chamber, back-up ring is set, is used for limiting the range of movement of second piston and first stage piston respectively.

Two go out multi-stage expansion oil cylinder, outer piston is arranged on fixed supporting leg.First stage piston head is connected with the first movable supporting legs, and the first movable supporting legs moves with first stage piston.Second piston head is connected with the second movable supporting legs, and the second movable supporting legs moves with second piston.

Stretch supporting leg job description (analyzing with oil cylinder left structure):

(1) the first fluid port 14 of telescoping cylinder connects pressure oil-source, and second fluid port 21 takes back oil, and outer piston (main cylinder 10) middle chamber pressure raises.Because the first check valve 44 response pressure value is higher than promoting pressure needed for I and II movable supporting legs, the 3rd check valve 47 points to outer piston middle chamber by direction simultaneously, makes pressure oil cannot enter first stage piston middle chamber.Under the effect of outer piston middle chamber internal pressure, first stage piston is pushed, and makes first stage piston and second piston to left movement.Stop after I and II piston movement contacts to first stage piston with outer piston back-up ring.

In this process, the oil in outer piston rod chamber enters in oil return respectively by the intercommunicating pore (first through flow hole 22 and threeway discharge orifice 41) on first stage piston and second piston and second fluid port 21.

The corresponding movable supporting legs motion conditions of cylinder action of this one-phase is: first and second grade of movable supporting legs is extended, and wherein first order movable supporting legs is stretched entirely, and secondary activity supporting leg, relative to first order movable supporting legs, action does not occur.

(2) after first stage piston is blocked by outer piston back-up ring, in outer piston middle chamber, pressure durations raises, after its pressure is greater than the first check valve 44 response pressure, first check valve 44 conducting, pressure oil enters in first stage piston middle chamber from outer piston middle chamber, promote second piston to left movement, when touching first stage piston back-up ring to second piston, second piston motion stops.Period, second piston can intercommunicating pore (threeway discharge orifice 41) on first stage piston, when this piston is by intercommunicating pore position, outer piston rod chamber is communicated with middle chamber, because middle chamber area of thrust surface are much larger than rod chamber, first stage piston can be crushed on outer piston back-up ring all the time, and therefore first stage piston can't move.Oil in second piston rod chamber is entered in oil return by the intercommunicating pore (the first through flow hole 22) on second piston and second fluid port 21.

The corresponding movable supporting legs motion conditions of cylinder action of this one-phase is: secondary activities supporting leg is all stretched out, and I and II movable supporting legs is finally in stretches state entirely.

Contracting supporting leg job description (analyzing with oil cylinder left structure)

(1) the second fluid port 21 of telescopic oil cylinder connects pressure oil-source, and first fluid port 14 takes back oil, and now oil enters first stage piston rod chamber by the intercommunicating pore (the first through flow hole 22) on second piston, promotes second piston and moves right.Oil in first stage piston middle chamber then enters outer piston middle chamber by the 3rd check valve 47 on first stage piston, then enters oil return by first fluid port 14.

The corresponding movable supporting legs motion conditions of cylinder action of this one-phase is: secondary activities supporting leg bounces back, and one-level movable supporting legs keeps static.

(2) when second piston is after the intercommunicating pore (threeway discharge orifice 41) on first stage piston (the 3rd piston barrel 40), first stage piston rod chamber is communicated with outer piston rod chamber, and outer piston middle chamber and outer piston rod chamber disconnect.When after second piston contact first stage piston, second piston is relative to first stage piston stop motion, and the pressure simultaneously raised in outer piston rod chamber promotes first stage piston and moves right, and final I and II piston synchronous is received to the full reduced state of oil cylinder.Oil in outer piston middle chamber enters oil return by first fluid port 14.

The corresponding movable supporting legs motion conditions of cylinder action of this one-phase is: secondary activity supporting leg is full reduced, and first and second grade of movable supporting legs is synchronously retracted to full reduced state.

First embodiment:

Use three three-position four-way valves (being respectively flexible transfer valve 60, first action transfer valve 80 and the second action transfer valve 90) of two profiles number, realize landing leg stretching to switch, front and back supporting leg switches, the function that left and right supporting leg switches, and the mode also by combining realizes the action distributed.

By connecting the following action that can realize supporting leg above:

Supporting leg is stretched entirely, contracting; Left side supporting leg is stretched, is contracted; Right side supporting leg is stretched, is contracted; Front leg strut is stretched, contracting; Rear support leg is stretched, contracting; Left front supporting leg is stretched, is contracted; Left back supporting leg is stretched, is contracted; Right front supporting leg is stretched, is contracted; Right back supporting leg is stretched, is contracted.

Second embodiment:

Only arrange a three-position four-way valve (flexible transfer valve 60), for controlling the flexible of all supporting legs, realize the synchronization telescope operation of front, rear, left and right supporting leg, this is solution the most succinct and with low cost.

The mode that can physics be adopted on this basis to stop, as arranged latch between certain two-stage supporting leg, stops the relative motion of this grade of supporting leg, and due in such a system, the flexible condition of each supporting leg is identical, then other supporting legs be not prevented from can be free without hindrance flexible.By this way, each supporting leg selectivity can be realized and stretch.

3rd embodiment:

On the basis of the second embodiment, oil circuit arranges 4 shutoff valves (first shutoff valve 71 and the second shutoff valve 72), controls the single movement of each supporting leg respectively.Shutoff valve is opened, oil circuit conducting, and associated leg can be freely movable; Shutoff valve is closed, and relevant oil circuit disconnects, supporting leg locking.

The advantage of the hoisting crane in the present invention has:

(1) vehicle arrangement structure is compact;

(2) stretching structure is simple, and without wire rope winding mechanism, technique is simple, and easily assemble, Maintenance free, reliability is high;

(3) lightweight, save the weight of two fixed supporting legs;

(4) control system is simple, and only need a common three-position four-way valve can control the flexible of all movable supporting legs time the simplest, valve member is few, and hydraulic circuit is succinct, and cost is very low, and stringing is convenient;

(5) by the ingenious layout of cylinder structure design with check valve, the order that can realize supporting leg is stretched, is contracted, without the need to extra control system;

(6) enormously simplify supporting leg control capsule, control key mapping few, cost is low.

By in the application two go out the structure of multi-stage oil cylinder be split as two the even oil cylinder of greater number to realize the effect consistent with function of the present invention; The selection of control cock can be various, and the operating mode of control cock can be various, and oil circuit connects can be various, can by two go out multi-stage expansion oil cylinder realize needed for function.

The advantage of the leg control system in the present invention has:

(1) sequential telescopic of left and right multistage movable supporting legs can be realized by an oil cylinder;

(2) oil cylinder is by the layout of check valve, and the order realizing two-stage supporting leg stretches function;

(3) oil cylinder is by structure design, realizes the order contracting function of two-stage supporting leg;

(4) pass through pair use going out multi-stage expansion oil cylinder, instead of the wire rope leg telescoping mechanism that reliability is not high;

(5) the supporting leg mode simplified;

(6) two go out the first Application of multi-stage expansion oil cylinder.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (16)

1. a telescoping cylinder, is characterized in that, comprising:
Main cylinder (10), has the inner chamber passing to axially the second end from the axial first end of described main cylinder (10);
First piston assembly, along being axially movably arranged in described inner chamber of described main cylinder (10), and has the first external part stretched out from the axial first end of described main cylinder (10);
Second piston component, along being axially movably arranged in described inner chamber of described main cylinder (10), and has the second external part stretched out from axis second end of described main cylinder (10);
Wherein, described first piston assembly and described second piston component by described inner chamber vertically first end to axial the second end be divided into the first cavity (11) successively, middle chamber (13) and the second cavity (12), described main cylinder (10) is provided with the first fluid port (14) be communicated with described middle chamber (13), described first external part is provided with the second fluid port (21) with described first cavity (11) with connected state, described second external part is provided with the 3rd fluid port (31) with described second cavity (12) with connected state.
2. telescoping cylinder according to claim 1, is characterized in that,
Described first piston assembly and described second piston component include multi-level piston sheathed successively, every grade of piston includes piston body and hollow piston rod, the piston body of the described piston of outermost one-level and described main cylinder (10) bearing fit, the piston body of other pistons at different levels be upper class piston hollow piston rod and with the piston body bearing fit of upper class piston;
Wherein, described second fluid port (21) is arranged on the hollow piston rod of the most described piston of inner side of described first piston assembly, and described 3rd fluid port (31) arranges with on the hollow piston rod of the described piston of the inner side of described second piston component; The hollow piston rod of described piston at different levels all offers through flow hole, and except the described piston of inner side, the piston body of described piston at different levels is provided with intercommunicating pore.
3. telescoping cylinder according to claim 2, is characterized in that,
Described intercommunicating pore comprise stretch out intercommunicating pore and retraction intercommunicating pore, described stretching out in intercommunicating pore is provided with pressure-gradient control valve group, when the described fluid pressure stretching out the side of the close described middle chamber (13) of intercommunicating pore is greater than the setting pressure of described pressure-gradient control valve group, described in stretch out the side of the close described middle chamber (13) of intercommunicating pore fluid pass through described in stretch out intercommunicating pore flow into described in stretch out the opposite side of intercommunicating pore;
Be provided with check valve in described retraction intercommunicating pore, the oil inlet of described check valve is communicated with the side away from described middle chamber (13) of described retraction intercommunicating pore, and the oil outlet of described check valve is communicated with the opposite side of described retraction intercommunicating pore.
4. telescoping cylinder according to claim 2, is characterized in that, described second piston component comprises the at different levels described piston with described first piston assembly peer.
5. telescoping cylinder according to claim 1, is characterized in that,
Described first piston assembly comprises first piston cylinder (20), one end of described first piston cylinder (20) is along the axially movably setting of described main cylinder (10), and the other end of described first piston cylinder (20) is described first external part;
Described second piston component comprises the second piston barrel (30), one end of described second piston barrel (30) is along the axially movably setting of described main cylinder (10), and the other end of described second piston barrel (30) is described second external part;
Described first piston assembly also comprises the 3rd piston barrel (40), described 3rd piston barrel (40) being axially movably arranged in described first cavity (11) along described main cylinder (10), and one end away from described first external part of described first piston cylinder (20) is arranged in described 3rd piston barrel (40) movably;
Described second piston component also comprises the 4th piston barrel (50), described 4th piston barrel (50) being axially movably arranged in described second cavity (12) along described main cylinder (10), and one end away from described second external part of described second piston barrel (30) is arranged in described 4th piston barrel (50) movably;
Wherein, the hollow piston rod of described first piston cylinder (20) is provided with the first through flow hole (22), the hollow piston rod of described second piston barrel (30) is provided with the second through flow hole (32); The hollow piston rod of described 3rd piston barrel (40) is provided with threeway discharge orifice (41), the hollow piston rod of described 4th piston barrel (50) is provided with the 4th through flow hole (51).
6. telescoping cylinder according to claim 1, it is characterized in that, second confined planes of the first confined planes being provided with the largest motion distance limiting described first piston assembly in described main cylinder (10) and the largest motion distance limiting described second piston component, described first fluid port (14) is arranged on the described main cylinder (10) between described first confined planes and described second confined planes.
7. a leg control system, is characterized in that, comprising:
Telescoping cylinder, described telescoping cylinder is the telescoping cylinder described in any one of claim 1 to 6, and hollow piston rod one end of first stage piston, inner side of the first piston assembly of described telescoping cylinder drives with the supporting leg of the body side in construction machinery and equipment and is connected, the second piston component of described telescoping cylinder inside the hollow piston rod of first stage piston drive with the respective leg of described body opposite side and be connected.
8. leg control system according to claim 7, is characterized in that, described leg control system also comprises:
Flexible transfer valve (60), described flexible transfer valve (60) comprises oil inlet (61), oil outlet (62), the first actuator port (63) and the second actuator port (64), and described flexible transfer valve (60) comprises primary importance and the second place, in the primary importance of described flexible transfer valve (60), described oil inlet (61) is communicated with described first actuator port (63), and described oil outlet (62) is communicated with described second actuator port (64); In the second place of described flexible transfer valve (60), described oil inlet (61) is communicated with described second actuator port (64), and described oil outlet (62) is communicated with described first actuator port (63);
Wherein, described oil inlet (61) is connected with Hydraulic Pump (65), described oil outlet (62) is connected with petrol storage tank (66), described first actuator port (63) is connected with the first fluid port (14) of described telescoping cylinder, and second fluid port (21) and the described 3rd fluid port (31) of described second actuator port (64) and described telescoping cylinder are connected.
9. leg control system according to claim 8, is characterized in that, described leg control system also comprises:
First shutoff valve (71), described first shutoff valve (71) is arranged on and connects second actuator port (64) of described flexible transfer valve (60) with on the hydraulic tubing of the second fluid port (21) of described telescoping cylinder;
Second shutoff valve (72), described second shutoff valve (72) is arranged on and connects second actuator port (64) of described flexible transfer valve (60) with on the hydraulic tubing of the 3rd fluid port (31) of described telescoping cylinder.
10. leg control system according to claim 8, is characterized in that, described leg control system comprises multiple described telescoping cylinder, and described multiple telescoping cylinder be arranged in parallel along the axial direction of described body, and described multiple telescoping cylinder is connected in parallel.
11. leg control system according to claim 10, it is characterized in that, the first point of connection is formed between the second fluid port (21) of telescoping cylinder described in each, the second point of connection is formed between 3rd fluid port (31) of telescoping cylinder described in each, and hydraulic tubing between the described second fluid port (21) of telescoping cylinder described in each and described first point of connection is provided with the first shutoff valve (71), hydraulic tubing between the described 3rd fluid port (31) of telescoping cylinder described in each and described second point of connection is provided with the second shutoff valve (72).
12. leg control system according to claim 10, it is characterized in that, described leg control system also comprises telescoping cylinder and selects control cock group, between the first actuator port (63) that described telescoping cylinder selects control cock group to be arranged on described flexible transfer valve (60) and the first fluid port (14) of telescoping cylinder described in each, for controlling the oil circuit break-make of telescoping cylinder described in each.
13. leg control system according to claim 12, is characterized in that, described telescoping cylinder selects control cock group to comprise:
First action transfer valve (80), described first action transfer valve (80) comprises oil-feed valve port (81), the first work valve port (82) and the second work valve port (83), and described first action transfer valve (80) comprises primary importance, the second place and the 3rd position, in the primary importance of described first action transfer valve (80), described oil-feed valve port (81) and described first valve port (82) that works is communicated with; In the second place of described first action transfer valve (80), described oil-feed valve port (81) and described first valve port (82) and described second valve port (83) that works that works all is communicated with; In the 3rd position of described first action transfer valve (80), described oil-feed valve port (81) and described second valve port (83) that works is communicated with;
Wherein, described oil-feed valve port (81) is connected with first actuator port (63) of described flexible transfer valve (60), described first work valve port (82) is connected with the first fluid port (14) of the telescoping cylinder being positioned at described front part of a body, and described second work valve port (83) is connected with the first fluid port (14) of the telescoping cylinder being positioned at described After-Body.
14. leg control system according to claim 10, it is characterized in that, described leg control system also comprises supporting leg and selects control cock group, described supporting leg selects control cock group to be arranged between the described second fluid port (21) of second actuator port (64) of described flexible transfer valve (60) and telescoping cylinder described in each and described 3rd fluid port (31), for controlling the break-make of the side of each telescoping cylinder.
15. leg control system according to claim 11, is characterized in that, described supporting leg selector valve group also comprises:
Second action transfer valve (90), described second action transfer valve (90) comprises oil-feed port (91), the first work port (92) and the second work port (93), and described second action transfer valve (90) comprises primary importance, the second place and the 3rd position, in the primary importance of described second action transfer valve (90), described oil-feed port (91) and described first port (92) that works is communicated with; In the second place of described second action transfer valve (90), described oil-feed port (91) and described first port (92) and described second port (93) that works that works all is communicated with; In the 3rd position of described second action transfer valve (90), described oil-feed port (91) and described second port (93) that works is communicated with;
Wherein, described oil-feed port (91) is connected with second actuator port (64) of described flexible transfer valve (60), described first work port (92) is connected with the second fluid port (21) of described telescoping cylinder, and described second work port (93) is connected with the 3rd fluid port (31) of described telescoping cylinder.
16. 1 kinds of hoisting cranes, comprise body (100) and be arranged on the supporting leg (200) of described body (100) both sides, it is characterized in that, described hoisting crane also comprises:
Leg control system, the two ends of the telescoping cylinder in described leg control system drive with the supporting leg of described body (100) side respectively and are connected, and the leg control system of described leg control system according to any one of claim 7 to 15.
CN201410691457.1A 2014-11-25 2014-11-25 Telescoping cylinder, leg control system and crane CN104591014B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105422546A (en) * 2015-12-25 2016-03-23 中国航空工业集团公司沈阳发动机设计研究所 Multi-piston rod acting cylinder
CN106698215A (en) * 2016-12-12 2017-05-24 南陵宝恒野生葛种植专业合作社 Two-stage telescopic arm mechanical arm
CN108488146A (en) * 2018-06-29 2018-09-04 苏州舍勒智能科技有限公司 A kind of two-way controllable double-acting cylinder
CN109611410A (en) * 2018-12-29 2019-04-12 山东万通液压股份有限公司 A kind of swelling oil cylinder

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CN101865178A (en) * 2009-04-15 2010-10-20 北京谊安医疗系统股份有限公司 Two-stage hydraulic cylinder
CN101900150A (en) * 2010-08-31 2010-12-01 三一汽车起重机械有限公司 Multi-stage oil cylinder and hydraulic device with same
CN102072221A (en) * 2010-12-29 2011-05-25 三一汽车起重机械有限公司 Multi-stage oil cylinder with pin and crane with same
CN202789835U (en) * 2012-09-24 2013-03-13 重庆科技学院 Internal high pressure flow type multi-stage hydraulic cylinder
CN103603975A (en) * 2013-11-26 2014-02-26 湖南特力液压有限公司 Check valve with push rod and multi-stage hydraulic cylinder
CN104310247A (en) * 2014-09-22 2015-01-28 中联重科股份有限公司 Landing leg supporting structure and automobile crane

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US3956970A (en) * 1971-11-02 1976-05-18 Montanhydraulik Gmbh & Co. Kg Multiple stage hydraulic telescopic cylinder device
DE2427430A1 (en) * 1974-05-23 1975-12-18 Up Right Inc Multi-stage lifting device
CN201050516Y (en) * 2007-06-04 2008-04-23 南通液压机械有限公司 Multi-stage synchronous extension double-acting hydraulic cylinder
US20090049692A1 (en) * 2007-08-21 2009-02-26 Agco Corporation Integrated breakaway cylinder and method for constructing a boom assembly
CN101865178A (en) * 2009-04-15 2010-10-20 北京谊安医疗系统股份有限公司 Two-stage hydraulic cylinder
CN101900150A (en) * 2010-08-31 2010-12-01 三一汽车起重机械有限公司 Multi-stage oil cylinder and hydraulic device with same
CN102072221A (en) * 2010-12-29 2011-05-25 三一汽车起重机械有限公司 Multi-stage oil cylinder with pin and crane with same
CN202789835U (en) * 2012-09-24 2013-03-13 重庆科技学院 Internal high pressure flow type multi-stage hydraulic cylinder
CN103603975A (en) * 2013-11-26 2014-02-26 湖南特力液压有限公司 Check valve with push rod and multi-stage hydraulic cylinder
CN104310247A (en) * 2014-09-22 2015-01-28 中联重科股份有限公司 Landing leg supporting structure and automobile crane

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105422546A (en) * 2015-12-25 2016-03-23 中国航空工业集团公司沈阳发动机设计研究所 Multi-piston rod acting cylinder
CN106698215A (en) * 2016-12-12 2017-05-24 南陵宝恒野生葛种植专业合作社 Two-stage telescopic arm mechanical arm
CN108488146A (en) * 2018-06-29 2018-09-04 苏州舍勒智能科技有限公司 A kind of two-way controllable double-acting cylinder
CN109611410A (en) * 2018-12-29 2019-04-12 山东万通液压股份有限公司 A kind of swelling oil cylinder

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