CN105545853A - Telescopic control valve, multi-stage telescopic hydraulic system and hoist jib telescopic hydraulic control system - Google Patents
Telescopic control valve, multi-stage telescopic hydraulic system and hoist jib telescopic hydraulic control system Download PDFInfo
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- CN105545853A CN105545853A CN201511024320.1A CN201511024320A CN105545853A CN 105545853 A CN105545853 A CN 105545853A CN 201511024320 A CN201511024320 A CN 201511024320A CN 105545853 A CN105545853 A CN 105545853A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes 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
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
- F15B2013/004—Cartridge valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Actuator (AREA)
Abstract
The invention relates to a telescopic control valve, a multi-stage telescopic hydraulic system and a hoist jib telescopic hydraulic control system. The telescopic control valve comprises a valve body, wherein a first oil port and at least two second oil ports are formed in the valve body, oil passing ways are connected between the first oil port and the at least two second oil ports, on-off valves are arranged on all the oil passing ways, a control oil port of each on-off valve is connected with a control oil source by the aid of a reversing valve, selection of all the on-off valves can be realized through reversing by the reversing valves, and then the oil passing ways are connected or disconnected. The telescopic control valve is provided with the first oil port, the second oil ports, the reversing valves and the on-off valves, and the different oil passing ways can be connected or disconnected through reversing by the reversing valves. For a multi-stage telescopic hydraulic system, a cylinder rod corresponding to one selected oil way can be controlled to extend or retract, and other oil ways are cut off, so that action of the cylinder rod cannot be affected, and independent control on each stage of cylinder barrel is realized.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly relate to a kind of extension and contraction control valve, multi-stage expansion hydraulic system and arm of derrick and to stretch hydraulic control system.
Background technique
Multistage hydraulic cylinder generally can realize the flexible of more than secondary or secondary, industry generally claims telscoping hydaulic cylinder, is mainly divided into single-acting formula and double action.The oil inlet and outlet of single-acting formula multistage hydraulic cylinder is same, and when stretching out, depended on pressure makes cylinder barrel at different levels order stretch out, and realizes, such as Self dumping truck lift oil cylinder during retraction by gravity or other external force.The large loculus of double-acting hydraulic cylinder all has hydraulic fluid port to control, and internal galleries is comparatively complicated, if hydraulic fluid port Position Design is improper when designing, easily scratches seal ring, reduces hydraulic cylinder life.Existing multistage hydraulic cylinder can realize synchronous or sequentially-operating, and in order to meet the usage requirement of complex mechanism, its internal structure is also more and more meticulousr with complexity.
As shown in Figure 1, be the structural representation of twin-tub telescopic hydraulic system in prior art, this system adopts twin-tub to add rope row extending means: the first oil hydraulic cylinder a2 and the second oil hydraulic cylinder a3 shares an oil sources, is controlled the motion of two oil hydraulic cylinders by extension and contraction control valve a1.Wherein fuel feeding is carried out by the central cores pipe of the second oil hydraulic cylinder a3 in the large chamber of the first oil hydraulic cylinder a2, and the loculus of the first oil hydraulic cylinder a2 is connected with the loculus of the second oil hydraulic cylinder a3.
The telescopic control system of this structure has following shortcoming:
1, double hydraulic cylinder weight is comparatively large, arm in carry out operation under long-armed above operating mode time, the impact certain on the stressed generation of arm and oil hydraulic cylinder;
2, arrange double hydraulic cylinder in arm, take up room large, make complete machine compact not, affect arm cross section, and have a definite limitation to Sheng Pai mechanism;
3, extension and contraction control valve is more complicated;
4, the cost of double hydraulic cylinder and extension and contraction control valve is higher.
As shown in Figure 2, a kind of multistage sequential telescopic oil hydraulic cylinder is also had in prior art, this multistage sequential telescopic oil hydraulic cylinder comprises extension and contraction control valve b1 and two-stage extension and contraction control oil cylinder, the first oil circuit b2 and the second oil circuit b4 is provided with in middle one-level cylinder barrel inside, first oil circuit b2 is communicated with the rod chamber of filler opening and final stage telescopic oil cylinder, second oil circuit b4 is provided with sequence valve b3, in middle one-level cylinder barrel, is also provided with one-way valve b5 in addition, realized the sequential telescopic of oil hydraulic cylinder by sequence valve b3 and one-way valve b5.
Its shortcoming is:
1, maintenance difficult: when sequence valve b3 and one-way valve b5 breaks down (regulate as needs pressure or occur leaking), maintenance meeting quite difficulty, the arm of car load of must dismantling, then decomposed solution cylinder pressure, could keep in repair;
2, sequence valve pressure arranges the hidden danger brought: when arranging order pressure, need to calculate outermost level cylinder barrel accurately and stretch out required pressure, force value arranges too low sequentially-operating and can upset, and outermost level cylinder barrel is likely servo-actuated when middle cylinder barrel action; Force value arranges too high, easily produces impact, and can cause the larger pressure loss when opening sequence valve on sequence valve;
3, the narrow limitation brought of sequentially-operating: for five joint boom cranes, when configuring this multistage hydraulic cylinder and Sheng Pai mechanism, middle cylinder barrel drives two joint arms, and final stage cylinder barrel promotes three, four, five joint arms of rope row mechanism controls.When adopting organization plan as shown in Figure 2, first can only stretch two joint arms, and then stretch three, four, five joint arms.When client does not need full semi-girder long, and when only needing three, four, five joint arm brachiums to meet applying working condition, just need to stretch separately three, four, five joint arms not stretching in two joint arm situations, and due to the narrow limitation of this multistage sequential telescopic oil hydraulic cylinder sequentially-operating, cannot above-mentioned requirements be met.
To sum up, Synchronized Telescopic Cylinder and multistage sequential telescopic oil hydraulic cylinder have certain narrow limitation.Synchronized Telescopic Cylinder can only realize synchronization telescope, and can not realize the difference action of oil hydraulic cylinder; Multistage sequential telescopic oil hydraulic cylinder can only according to the sequential telescopic of specifying, and the order of oil hydraulic cylinder is fixed, and can not realize arbitrarily controlling the flexible of every grade of cylinder barrel, therefore which limits the performance requirement of crane telescopic mechanism.
Summary of the invention
The object of the invention is to propose a kind of extension and contraction control valve, multi-stage expansion hydraulic system and arm of derrick to stretch hydraulic control system, to realize controlling the independence of every grade of cylinder barrel in multi-stage expansion oil hydraulic cylinder.
For achieving the above object, the invention provides a kind of extension and contraction control valve, comprise valve body, described valve body is provided with the first hydraulic fluid port and at least two the second hydraulic fluid ports, described first hydraulic fluid port is connected with logical oily oil circuit respectively and between described at least two the second hydraulic fluid ports, logical oil circuit described in each bar is respectively equipped with on-off valve, the control port of on-off valve described in each is connected with control oil sources respectively by described selector valve, the selection to on-off valve described in each can be realized by the commutation of described selector valve, and then realize the conducting of described logical oil circuit or block.
Further, described on-off valve is cartridge valve.
Further, described control oil sources comes from the hydraulic fluid port that in described first hydraulic fluid port and described at least two the second hydraulic fluid ports, pressure is maximum.
Further, also comprise shuttle valve network, described shuttle valve network is for choosing the pressure maximum in described first hydraulic fluid port and described at least two the second hydraulic fluid ports, and feed back to by the control port of the described on-off valve selected by described selector valve, to make the described on-off valve by selecting close, and non-selected described on-off valve is opened.
Further, described valve body is also provided with the 3rd hydraulic fluid port and the 4th hydraulic fluid port, described 3rd hydraulic fluid port is communicated with described 4th hydraulic fluid port, using as oil inlet passage or drainback passage.
For achieving the above object, present invention also offers a kind of multi-stage expansion hydraulic system, comprise at least two-stage oil hydraulic cylinder and above-mentioned extension and contraction control valve, described at least two the second hydraulic fluid ports on described extension and contraction control valve are communicated with each rodless cavity of described at least two-stage oil hydraulic cylinder respectively, described valve body is also provided with the 3rd hydraulic fluid port and the 4th hydraulic fluid port, described 3rd hydraulic fluid port is communicated with described 4th hydraulic fluid port, using as oil inlet passage or drainback passage, described at least two-stage oil hydraulic cylinder is provided with the internal galleries be communicated with each rod chamber of described at least two-stage oil hydraulic cylinder, described 3rd hydraulic fluid port is communicated with described internal galleries, the independence that described extension and contraction control valve realizes stretching out each cylinder bar of described at least two-stage oil hydraulic cylinder or retracting by the commutation of described selector valve controls.
Further, the outside between described at least two the second hydraulic fluid ports and each rodless cavity of described at least two-stage oil hydraulic cylinder is connected oil circuit and is provided with equilibrium valve.
Further, the control chamber of equilibrium valve described in each is all connected on the connection oil circuit of described 3rd hydraulic fluid port and described internal galleries.
Further, described at least two-stage oil hydraulic cylinder comprises center piston bar, first order cylinder barrel, second level cylinder barrel and central cores pipe, wherein said center piston bar is as the piston rod of first order telescopic hydraulic cylinder, described second level cylinder barrel is set in the outside of described first order cylinder barrel, to make described first order cylinder barrel can as the piston rod of second level telescopic hydraulic cylinder, the end of described center piston bar is provided with the 5th hydraulic fluid port, 6th hydraulic fluid port and the 7th hydraulic fluid port, described 5th hydraulic fluid port is communicated with by the first internal galleries be arranged on described center piston bar with the rodless cavity of described first order telescopic hydraulic cylinder, described 6th hydraulic fluid port is communicated with by described central cores pipe with the rodless cavity of described second level telescopic hydraulic cylinder, described 7th hydraulic fluid port is communicated with by the second internal galleries be arranged on described center piston bar with the rod chamber of described first order telescopic hydraulic cylinder, the rod chamber of described first order telescopic hydraulic cylinder is communicated with by the 3rd internal galleries be arranged on described first order cylinder barrel with the rod chamber of described second level telescopic hydraulic cylinder.
For achieving the above object, present invention also offers a kind of arm of derrick and to stretch hydraulic control system, comprise arm and above-mentioned multi-stage expansion hydraulic system, described multi-stage expansion hydraulic system is for controlling stretching out or retracting of described arm.
Based on technique scheme, the present invention by arranging the first hydraulic fluid port and at least two the second hydraulic fluid ports on the valve body of extension and contraction control valve, the logical oil circuit that first hydraulic fluid port is connected with the second hydraulic fluid port is provided with on-off valve, the selection to different on-off valve can be realized by the commutation of selector valve, and then realize leading to the conducting of oil circuit to difference or blocking.When this extension and contraction control valve is applied to multi-stage expansion hydraulic system, the control to different oil circuit can be realized.For multi-stage expansion oil hydraulic cylinder, an oil circuit conducting is selected by this extension and contraction control valve, namely other non-selected oil circuits are truncated, the selected cylinder bar selected corresponding to oil circuit can be controlled like this stretch out or retract, and other oil circuits are owing to being truncated, therefore can not affect the action of this cylinder bar, achieve and the independence of every grade of cylinder barrel is controlled.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of twin-tub telescopic hydraulic system in prior art.
Fig. 2 is the structural representation of multistage sequential telescopic oil hydraulic cylinder in prior art.
Fig. 3 is the structural representation of an extension and contraction control valve of the present invention embodiment.
Fig. 4 is the structural representation of the unified embodiment of multi-stage expansion hydraulic pressure system of the present invention.
In figure: a1-extension and contraction control valve, a2-first oil hydraulic cylinder, a3-second oil hydraulic cylinder, a4-first equilibrium valve, a5-second equilibrium valve; B1-extension and contraction control valve, b2-first oil circuit, b3-sequence valve, b4-second oil circuit, b5-one-way valve;
1-center piston bar, 2-first order cylinder barrel, 3-second level cylinder barrel, F1-first cartridge valve, F2-second cartridge valve, F3-first shuttle valve, F4-second shuttle valve, Y1-selector valve, P1-first equilibrium valve, P2-second equilibrium valve, A-first hydraulic fluid port, A1, C1-second hydraulic fluid port, B1-the 3rd hydraulic fluid port, B-the 4th hydraulic fluid port, A2-the 5th hydraulic fluid port, C2-the 6th hydraulic fluid port, B2-the 7th hydraulic fluid port, A3, B3, B4, B5, C3-hydraulic fluid port, S0-central cores tube chamber, the rodless cavity of S1-first order telescopic hydraulic cylinder, the rod chamber of S2-first order telescopic hydraulic cylinder, the rodless cavity of S3-second level telescopic hydraulic cylinder, the rod chamber of S4-second level telescopic hydraulic cylinder.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technological scheme in embodiment is clearly and completely described.Obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In describing the invention, it will be appreciated that, term " " center ", " transverse direction ", " longitudinal direction ", " front ", " afterwards ", " left side ", " right side ", " on ", D score, " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limiting the scope of the invention can not be interpreted as.
As shown in Figure 3, for the structural representation of an extension and contraction control valve of the present invention embodiment, this extension and contraction control valve comprises valve body, described valve body is provided with the first hydraulic fluid port A and at least two the second hydraulic fluid port A1, C1, described first hydraulic fluid port A respectively with described at least two the second hydraulic fluid port A1, logical oil circuit is connected with between C1, logical oil circuit described in each bar is respectively equipped with on-off valve, the control port of on-off valve described in each is connected with control oil sources respectively by described selector valve Y1, the selection to on-off valve described in each can be realized by the commutation of described selector valve Y1, and then realize the conducting of described logical oil circuit or block.
By arranging the first hydraulic fluid port and at least two the second hydraulic fluid ports on the valve body of extension and contraction control valve, the logical oil circuit that first hydraulic fluid port is connected with the second hydraulic fluid port is provided with on-off valve, the selection to different on-off valve can be realized by the commutation of selector valve, and then realize leading to the conducting of oil circuit to difference or blocking.When this extension and contraction control valve is applied to multi-stage expansion hydraulic system, the control to different oil circuit can be realized.For multi-stage expansion oil hydraulic cylinder, an oil circuit conducting is selected by this extension and contraction control valve, namely other non-selected oil circuits are truncated, the selected cylinder bar selected corresponding to oil circuit can be controlled like this stretch out or retract, and other oil circuits are owing to being truncated, therefore can not affect the action of this cylinder bar, achieve and the independence of every grade of cylinder barrel is controlled.
Wherein, on-off valve can select any switch valve with control chamber, such as relief valve etc.In one embodiment, described on-off valve is cartridge valve, can realize the control to more large discharge or larger pressurized hydraulic oil.
Described control oil sources comes from the hydraulic fluid port that in described first hydraulic fluid port A and described at least two second hydraulic fluid port A1, C1, pressure is maximum.Extension and contraction control valve can also comprise shuttle valve network, described shuttle valve network is for choosing the pressure maximum in described first hydraulic fluid port A and described at least two second hydraulic fluid port A1, C1, and feed back to by the control port of the described on-off valve selected by described selector valve Y1, to make the described on-off valve by selecting close, and non-selected described on-off valve is opened.
Further, described valve body is also provided with the 3rd hydraulic fluid port B1 and the 4th hydraulic fluid port B, described 3rd hydraulic fluid port B1 is communicated with described 4th hydraulic fluid port B, using as oil inlet passage or drainback passage.
As shown in Figure 3, this extension and contraction control valve is provided with the first hydraulic fluid port A, two the second hydraulic fluid port A1 and C1, the 3rd hydraulic fluid port B1 and the 4th hydraulic fluid port B, selector valve Y1, the first cartridge valve F1, the second cartridge valve F2, the first shuttle valve F3 and the second shuttle valve F4 is provided with in valve body, wherein selector valve Y1 is two-position four-way solenoid directional control valve, the filler opening of the first cartridge valve F1 is connected with the first hydraulic fluid port A, the oil outlet of the first cartridge valve F1 is connected with the second hydraulic fluid port A1, and the control port of the second cartridge valve F2 is connected with an actuator port of selector valve Y1; The filler opening of the first cartridge valve F1 is connected with the first hydraulic fluid port A, and the oil outlet of the second cartridge valve F2 is connected with the second hydraulic fluid port C1, and the control port of the second cartridge valve F2 is connected with another actuator port of selector valve Y1.
The filler opening at the second shuttle valve F4 two ends is connected with the second hydraulic fluid port A1 and the second hydraulic fluid port C1 respectively, the oil outlet of the second shuttle valve F4 is connected with one end filler opening of the first shuttle valve F3, the other end filler opening of the first shuttle valve F3 is connected with the first hydraulic fluid port A, the oil outlet of the first shuttle valve F3 is connected with a filler opening of selector valve Y1, and another filler opening of selector valve Y1 connects fuel tank.
When selector valve Y1 must not electricity time, the work of selector valve Y1 bottom, the pressure maximum that first shuttle valve F3 and the second shuttle valve F4 chooses is applied to the control port of the second cartridge valve F2 by selector valve Y1, second cartridge valve F2 is closed, and the control port of the first cartridge valve F1 is communicated with fuel tank by selector valve Y1, first cartridge valve F1 is in open mode, and the hydraulic oil therefore being entered extension and contraction control valve by the first hydraulic fluid port A flows to the second hydraulic fluid port A1 by the first cartridge valve F1.
When selector valve Y1 obtains electric, the upper work of selector valve Y1, the pressure maximum that first shuttle valve F3 and the second shuttle valve F4 chooses is applied to the control port of the first cartridge valve F1 by selector valve Y1, first cartridge valve F1 is closed, and the control port of the second cartridge valve F2 is communicated with fuel tank by selector valve Y1, second cartridge valve F2 is in open mode, and the hydraulic oil therefore being entered extension and contraction control valve by the first hydraulic fluid port A flows to the second hydraulic fluid port C1 by the second cartridge valve F2.
Namely, when hydraulic oil enters extension and contraction control valve from the first hydraulic fluid port A, by the dead electricity of selector valve Y1 with electric, on the oil circuit that hydraulic oil can be made to flow to be connected with the second hydraulic fluid port A1, or on the oil circuit that the flow direction is connected with the second hydraulic fluid port C1, the rodless cavity of the first order cylinder barrel in such as multi-stage expansion oil hydraulic cylinder corresponding to the oil circuit that the second hydraulic fluid port A1 connects, can realize stretching out of first order oil hydraulic cylinder; The rodless cavity of the second level cylinder barrel in multi-stage expansion oil hydraulic cylinder corresponding to the oil circuit that the second hydraulic fluid port C1 connects, can realize stretching out of second level oil hydraulic cylinder.
In addition, when hydraulic oil enters extension and contraction control valve from the 4th hydraulic fluid port B, by the dead electricity of selector valve Y1 with electric, oil return can be made to flow to the first hydraulic fluid port A by the oil circuit be connected with the second hydraulic fluid port A1, or the oil circuit connected by the oil circuit be connected with the second hydraulic fluid port C1 flows to the first hydraulic fluid port A, and now the first hydraulic fluid port A is as return opening.The rod chamber of the first order cylinder barrel in such as multi-stage expansion oil hydraulic cylinder corresponding to the oil circuit that the second hydraulic fluid port A1 connects, can realize the retraction of first order oil hydraulic cylinder; The rod chamber of the second level cylinder barrel in multi-stage expansion oil hydraulic cylinder corresponding to the oil circuit that the second hydraulic fluid port C1 connects, can realize the retraction of second level oil hydraulic cylinder.
As shown in Figure 4, the present invention also proposes a kind of multi-stage expansion hydraulic system, comprise at least two-stage oil hydraulic cylinder and above-mentioned extension and contraction control valve, described at least two the second hydraulic fluid port A1 on described extension and contraction control valve, C1 is communicated with each rodless cavity of described at least two-stage oil hydraulic cylinder respectively, described valve body is also provided with the 3rd hydraulic fluid port B1 and the 4th hydraulic fluid port B, described 3rd hydraulic fluid port B1 is communicated with described 4th hydraulic fluid port B, using as oil inlet passage or drainback passage, described at least two-stage oil hydraulic cylinder is provided with the internal galleries be communicated with each rod chamber of described at least two-stage oil hydraulic cylinder, described 3rd hydraulic fluid port B1 is communicated with described internal galleries, the independence that described extension and contraction control valve realizes stretching out each cylinder bar of described at least two-stage oil hydraulic cylinder or retracting by the commutation of described selector valve Y1 controls.
In addition, in order to realize steady control, the outside between described at least two second hydraulic fluid ports A1, C1 and each rodless cavity of described at least two-stage oil hydraulic cylinder is connected oil circuit and is provided with equilibrium valve.The control chamber of equilibrium valve described in each is all connected on the connection oil circuit of described 3rd hydraulic fluid port B1 and described internal galleries.
Particularly, for two-stage telescopic hydraulic system, described at least two-stage oil hydraulic cylinder comprises center piston bar 1, first order cylinder barrel 2, second level cylinder barrel 3 and central cores pipe, wherein said center piston bar 1 is as the piston rod of first order telescopic hydraulic cylinder, described second level cylinder barrel 3 is set in the outside of described first order cylinder barrel 2, to make described first order cylinder barrel 2 can as the piston rod of second level telescopic hydraulic cylinder, the end of described center piston bar 1 is provided with the 5th hydraulic fluid port A2, 6th hydraulic fluid port C2 and the 7th hydraulic fluid port B2, described 5th hydraulic fluid port A2 is communicated with by the first internal galleries be arranged on described center piston bar 1 with the rodless cavity S1 of described first order telescopic hydraulic cylinder, described 6th hydraulic fluid port C2 is communicated with by described central cores pipe with the rodless cavity S3 of described second level telescopic hydraulic cylinder, described 7th hydraulic fluid port B2 is communicated with by the second internal galleries be arranged on described center piston bar 1 with the rod chamber S2 of described first order telescopic hydraulic cylinder, the rod chamber S2 of described first order telescopic hydraulic cylinder is communicated with by the 3rd internal galleries be arranged on described first order cylinder barrel 2 with the rod chamber S4 of described second level telescopic hydraulic cylinder.
The present invention also proposes a kind of arm of derrick and to stretch hydraulic control system, and comprise arm and above-mentioned multi-stage expansion hydraulic system, described multi-stage expansion hydraulic system is for controlling stretching out or retracting of described arm.
Below the stretch working procedure of an embodiment of hydraulic control system of extension and contraction control valve of the present invention, multi-stage expansion hydraulic system and arm of derrick is described:
For secondary telescopic hydraulic cylinder, by extension and contraction control valve, realize the independent control of secondary telescopic hydraulic cylinder.
If fix with center piston bar 1, so first order cylinder barrel 2 and second level cylinder barrel 3 can be turned right and be carried out action (in like manner fix with second level cylinder barrel 3, then first order cylinder barrel 2 and center piston bar 1 are just toward left movement, and this situation illustrates no longer separately).
1, secondary telescopic hydraulic cylinder stretches out process:
When needs first order cylinder barrel 2 stretches out, pressure oil enters from the first hydraulic fluid port A, now selector valve Y1 must not be electric, spool is in the next work, pressure oil can pass through the first shuttle valve F3, the second cartridge valve F2 upper end is applied to again by selector valve Y1, due to the second cartridge valve F2 spool difference in areas, spool is closed, and the first cartridge valve F1 upper end does not control oil effect, therefore the first cartridge valve F1 opens, the pressure oil of working connection first hydraulic fluid port A from the second hydraulic fluid port A1 out, the 5th hydraulic fluid port A2 on center piston bar 1 is entered into again by the first equilibrium valve P1, again by the first internal galleries of center piston bar 1 inside, pressure oil from hydraulic fluid port A3 mouth out, enter into the rodless cavity S1 of first order telescopic hydraulic cylinder.The route of oil return is simultaneously as follows: the fluid in the rod chamber S2 of first order telescopic hydraulic cylinder is flowed out from the 7th hydraulic fluid port B2 by the second internal galleries of center piston bar 1 inside by hydraulic fluid port B3, extension and contraction control valve is entered into again by the 3rd hydraulic fluid port B1, flow out from the 4th hydraulic fluid port B, realize smooth oil return.In this process, the rodless cavity S1 of first order telescopic hydraulic cylinder is constantly full of fluid, thus realizes the extend action of first order cylinder barrel 2 and second level cylinder barrel 3.
Oil-feed simplifies route: A → F1 → A1 → P1 → A2 → A3 → S1
Oil return simplifies route: S2 → B3 → B2 → B1 → B
When needs second level cylinder barrel 3 stretches out, pressure oil enters from the first hydraulic fluid port A, now selector valve Y1 obtains electric, spool is in upper work, pressure oil can pass through the first shuttle valve F3, the first cartridge valve F1 upper end is applied to again by selector valve Y1, due to the first cartridge valve 1 spool difference in areas, spool is closed, and the second cartridge valve F2 upper end does not control oil effect, therefore the second cartridge valve F2 opens, the pressure oil of working connection first hydraulic fluid port A from the second hydraulic fluid port C1 out, the 6th hydraulic fluid port C2 on center piston bar 1 is entered into again by the second equilibrium valve P2, flow to the central cores tube chamber S0 of center piston bar 1 inside, pressure oil from hydraulic fluid port C3 out, enter into the rodless cavity S3 of second level telescopic hydraulic cylinder.The route of oil return is simultaneously as follows: the fluid in the rod chamber S4 of second level telescopic hydraulic cylinder passes through the 3rd internal galleries of second level cylinder barrel 3 from hydraulic fluid port B4 out by hydraulic fluid port B5, enter into the rod chamber S2 of first order telescopic hydraulic cylinder, flow through hydraulic fluid port B3 again to be flowed out from the 7th hydraulic fluid port B2 by the second internal galleries to center piston bar 1 inside, extension and contraction control valve is entered into again by the 3rd hydraulic fluid port B1, flow out from the 4th hydraulic fluid port B, realize smooth oil return.In this process, the rodless cavity S3 of second level telescopic hydraulic cylinder is constantly full of fluid, thus realizes the extend action of second level cylinder barrel 3.
Oil-feed simplifies route: A → F2 → C1 → P2 → C2 → S0 → C3 → S3
Oil return simplifies route: S4 → B5 → B4 → S2 → B3 → B2 → B1 → B
2, secondary telescopic hydraulic cylinder retraction process:
When needs first order cylinder barrel 2 is retracted, pressure oil enters extension and contraction control valve from the 4th hydraulic fluid port B, flow out from the 3rd hydraulic fluid port B1 again, enter into the 7th hydraulic fluid port B2 of center piston bar 1, again by the second internal galleries of center piston bar 1 inside, pressure oil from mouth oil B3 out, enters into the rod chamber S2 of first order telescopic hydraulic cylinder.The route of oil return is simultaneously as follows: the fluid in the rodless cavity S1 of first order telescopic hydraulic cylinder enters into the first internal galleries of center piston bar 1 from hydraulic fluid port A3, then flow out from the 5th hydraulic fluid port A2, by the first equilibrium valve P1, now because the Stress control oil on in-line is applied to the left end of the first equilibrium valve P1, first equilibrium valve P1 is switched to the work of left position, therefore oil return can flow to the second hydraulic fluid port A1 by the first equilibrium valve P1, enters into extension and contraction control valve.An oil return part flows to the first cartridge valve F1, a part is by the second shuttle valve F4, again by the first shuttle valve F3, the upper end of the second cartridge valve F2 is applied to again by selector valve Y1, the upper-end surface of the first cartridge valve F1 does not have pilot pressure oil, oil return can open the first cartridge valve F1, is then flowed out by the first hydraulic fluid port A.When the first cartridge valve F1 opens, due to the difference in areas of spool, can produce certain back pressure, this back pressure value is exactly the pilot pressure value being applied to the second cartridge valve F2 upper end.
Oil-feed simplifies route: B → B1 → B2 → B3 → S2 (Y1 must not be electric, the next work)
Oil return simplifies route: S1 → A3 → A2 → P1 → A1 → F1 → A
The state of now second level cylinder barrel 3 more below.When the 4th hydraulic fluid port B has pressure oil, pressure oil can be applied on the second equilibrium valve P2, and the second equilibrium valve P2 is now conducting.Know that pressure oil has entered into the rod chamber S2 of first order telescopic hydraulic cylinder above, when pressure oil continues through the 4th hydraulic fluid port B, the rod chamber S2 of first order telescopic hydraulic cylinder is constantly full of fluid, fluid likely can by the 3rd internal galleries of first order cylinder barrel 2, the rod chamber S4 of second level telescopic hydraulic cylinder is entered by hydraulic fluid port B5, pressure oil may impel second level cylinder barrel 3 to retract, but can second level cylinder barrel 3 retract, also to depend on that whether unimpeded the oil circuit of the rodless cavity S3 of second level telescopic hydraulic cylinder is.The rodless cavity S3 of second level telescopic hydraulic cylinder is through hydraulic fluid port C3, enter central cores tube chamber S0, flow out from the 6th hydraulic fluid port C2, the second equilibrium valve P2 again by opening, entered the second cartridge valve F2 in extension and contraction control valve by the second oily C1, but now have pilot pressure oil by the known second cartridge valve F2 upper end effect of upper surface analysis, therefore the second cartridge valve F2 closes, therefore the drainback passage of second level cylinder barrel 3 is obstructed, and namely second level cylinder barrel 3 cannot be retracted.
In like manner, when second level cylinder barrel 3 needs to retract, pressure oil enters extension and contraction control valve 1 from the 4th hydraulic fluid port B, flow out from the 3rd hydraulic fluid port B1 again, open the first equilibrium valve P1 on the one hand, enter into the 7th hydraulic fluid port B2 of two-stage telescopic hydraulic cylinder 2 on the one hand, again by the second internal galleries of center piston bar 21, flow out from hydraulic fluid port B3, enter into the rod chamber S2 of first order telescopic hydraulic cylinder, again by hydraulic fluid port B4, flowed out from hydraulic fluid port B5 by the 3rd internal galleries, enter into the rod chamber S4 of second level telescopic hydraulic cylinder.
The route of oil return is simultaneously as follows: the fluid in the rodless cavity S3 of second level telescopic hydraulic cylinder enters into central cores tube chamber S0 by hydraulic fluid port C3, flows out from the 6th hydraulic fluid port C2, by the first equilibrium valve P1 opened, enters into extension and contraction control valve 1 by hydraulic fluid port C1.An oil return part flows to the second cartridge valve F2, a part is by the second shuttle valve F4 and the first shuttle valve F3, by selector valve Y1, (Y1 obtains electric again, upper work) be applied to the upper end of the first cartridge valve F1, the upper-end surface of the second cartridge valve F2 does not have pilot pressure oil, and oil return can be opened the second cartridge valve F2 and then be flowed out by the first hydraulic fluid port A.When the second cartridge valve F2 opens, due to the difference in areas of spool, can produce certain back pressure, this back pressure value is exactly the pilot pressure value being applied to the first cartridge valve F1 upper end.
Oil circuit simplifies as follows:
In-line: B → B1 → B2 → B3 → S2 → B4 → B5 → S4 (Y1 obtains electric, upper work)
Oil circuit: S3 → C3 → S0 → C2 → P2 → C1 → F2 → A
The state of now first order cylinder barrel 2 more below.When the 4th hydraulic fluid port B has pressure oil, pressure oil can be applied on the first equilibrium valve P1, and the first equilibrium valve P1 is now conducting.Know that pressure oil has entered into the rod chamber S2 of first order telescopic hydraulic cylinder above, when pressure oil continues through the 4th hydraulic fluid port B, pressure oil may impel first order cylinder barrel 2 to retract, but can first order cylinder barrel 2 retract, also to depend on that whether unimpeded the oil circuit of the rodless cavity S1 of first order telescopic hydraulic cylinder is.The rodless cavity S1 of first order telescopic hydraulic cylinder is through hydraulic fluid port A3, enter the first internal galleries, flow out from the 5th hydraulic fluid port A2, the first equilibrium valve P1 again by opening, entered the first cartridge valve F1 in extension and contraction control valve 1 by the second hydraulic fluid port A1, but now have pilot pressure oil by the known first cartridge valve F1 upper end effect of upper surface analysis, therefore the first cartridge valve F1 closes, therefore the drainback passage of first order cylinder barrel 2 is obstructed, and namely first order cylinder barrel 2 cannot be retracted.
Known by above-mentioned analysis, the present invention can control stretching out and retract action of two-stage telescopic hydraulic cylinder respectively, and not by order restriction, has complete independence.
By the explanation of multiple embodiments of the hydraulic control system that stretches to extension and contraction control valve of the present invention, multi-stage expansion hydraulic system and arm of derrick, can see:
1, the application of extension and contraction control valve and multi-stage expansion hydraulic system, makes oil hydraulic cylinder become multistage hydraulic cylinder from multiple oil hydraulic cylinder, can reduce the quantity of oil hydraulic cylinder, reduce costs; In arm inner space, cloth is set up, and can provide larger space, is convenient to the placement of Sheng Pai mechanism and the optimization of arm cross section performance; And greatly can alleviate the weight of oil hydraulic cylinder, when arm stretches out oil hydraulic cylinder center of gravity after move, thus improve lifting performance and whole vehicle stability, operating efficiency also significantly improves.
2, multistage hydraulic cylinder can control separately, not by order restriction, solves the control problem of current multistage hydraulic cylinder, can meet the various applying working conditions of equipment.
3, maintenance aspect, the present invention does not need to arrange control valve in oil cylinder inside, decreases fault point, improves the reliability of telescopic system.
4, the control logic of extension and contraction control valve is simple, easily realizes, easy to operate, controls reliable.
Finally should be noted that: above embodiment is only in order to illustrate that technological scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technological scheme scope of request of the present invention protection.
Claims (10)
1. an extension and contraction control valve, it is characterized in that, comprise valve body, described valve body is provided with the first hydraulic fluid port (A) and at least two the second hydraulic fluid port (A1, C1), described first hydraulic fluid port (A) respectively with described at least two the second hydraulic fluid port (A1, C1) logical oily oil circuit is connected with between, logical oil circuit described in each bar is respectively equipped with on-off valve, the control port of on-off valve described in each is connected with control oil sources respectively by described selector valve (Y1), the selection to on-off valve described in each can be realized by the commutation of described selector valve (Y1), and then realize the conducting of described logical oil circuit or block.
2. extension and contraction control valve according to claim 1, is characterized in that, described on-off valve is cartridge valve.
3. extension and contraction control valve according to claim 1 and 2, is characterized in that, described control oil sources comes from the hydraulic fluid port that in described first hydraulic fluid port (A) and described at least two the second hydraulic fluid ports (A1, C1), pressure is maximum.
4. extension and contraction control valve according to claim 3, it is characterized in that, also comprise shuttle valve network, described shuttle valve network is used for choosing the pressure maximum in described first hydraulic fluid port (A) and described at least two the second hydraulic fluid ports (A1, C1), and feed back to by the control port of the described on-off valve selected by described selector valve (Y1), to make the described on-off valve by selecting close, and non-selected described on-off valve is opened.
5. extension and contraction control valve according to claim 1, it is characterized in that, described valve body is also provided with the 3rd hydraulic fluid port (B1) and the 4th hydraulic fluid port (B), described 3rd hydraulic fluid port (B1) is communicated with described 4th hydraulic fluid port (B), using as oil inlet passage or drainback passage.
6. a multi-stage expansion hydraulic system, it is characterized in that, comprise at least two-stage oil hydraulic cylinder and the extension and contraction control valve as described in any one of Claims 1 to 5, described at least two the second hydraulic fluid port (A1 on described extension and contraction control valve, C1) be communicated with each rodless cavity of described at least two-stage oil hydraulic cylinder respectively, described valve body is also provided with the 3rd hydraulic fluid port (B1) and the 4th hydraulic fluid port (B), described 3rd hydraulic fluid port (B1) is communicated with described 4th hydraulic fluid port (B), using as oil inlet passage or drainback passage, described at least two-stage oil hydraulic cylinder is provided with the internal galleries be communicated with each rod chamber of described at least two-stage oil hydraulic cylinder, described 3rd hydraulic fluid port (B1) is communicated with described internal galleries, the independence that described extension and contraction control valve realizes stretching out each cylinder bar of described at least two-stage oil hydraulic cylinder or retracting by the commutation of described selector valve (Y1) controls.
7. multi-stage expansion hydraulic system according to claim 6, is characterized in that, the outside between described at least two the second hydraulic fluid ports (A1, C1) and each rodless cavity of described at least two-stage oil hydraulic cylinder is connected oil circuit and is provided with equilibrium valve.
8. multi-stage expansion hydraulic system according to claim 7, is characterized in that, the control chamber of equilibrium valve described in each is all connected to described 3rd hydraulic fluid port (B1) with on the connection oil circuit of described internal galleries.
9. multi-stage expansion hydraulic system according to claim 6, it is characterized in that, described at least two-stage oil hydraulic cylinder comprises center piston bar (1), first order cylinder barrel (2), second level cylinder barrel (3) and central cores pipe, wherein said center piston bar (1) is as the piston rod of first order telescopic hydraulic cylinder, described second level cylinder barrel (3) is set in the outside of described first order cylinder barrel (2), to make described first order cylinder barrel (2) can as the piston rod of second level telescopic hydraulic cylinder, the end of described center piston bar (1) is provided with the 5th hydraulic fluid port (A2), 6th hydraulic fluid port (C2) and the 7th hydraulic fluid port (B2), described 5th hydraulic fluid port (A2) is communicated with by the first internal galleries be arranged on described center piston bar (1) with the rodless cavity (S1) of described first order telescopic hydraulic cylinder, described 6th hydraulic fluid port (C2) is communicated with by described central cores pipe with the rodless cavity (S3) of described second level telescopic hydraulic cylinder, described 7th hydraulic fluid port (B2) is communicated with by the second internal galleries be arranged on described center piston bar (1) with the rod chamber (S2) of described first order telescopic hydraulic cylinder, the rod chamber (S2) of described first order telescopic hydraulic cylinder is communicated with by the 3rd internal galleries be arranged on described first order cylinder barrel (2) with the rod chamber (S4) of described second level telescopic hydraulic cylinder.
10. arm of derrick stretches a hydraulic control system, and it is characterized in that, comprise arm and multi-stage expansion hydraulic system as described in any one of claim 1 ~ 9, described multi-stage expansion hydraulic system is for controlling stretching out or retracting of described arm.
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| CN201511024320.1A CN105545853B (en) | 2015-12-31 | 2015-12-31 | Extension and contraction control valve, multi-stage expansion hydraulic system and arm of derrick stretch hydraulic control system |
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| CN108302090A (en) * | 2018-01-08 | 2018-07-20 | 徐州重型机械有限公司 | A kind of multilayer core pipe two-stage hydraulic cylinder and crane |
| CN108483263A (en) * | 2018-06-25 | 2018-09-04 | 北汽福田汽车股份有限公司 | Hydraulic control valve, hydraulic system and crane |
| CN110043528A (en) * | 2019-03-20 | 2019-07-23 | 湖南双达机电有限责任公司 | Multi-stage expansion oil cylinder and crane |
| CN110081042A (en) * | 2019-05-21 | 2019-08-02 | 徐州徐工液压件有限公司 | A kind of multi-stage expansion hydraulic cylinder with the synchronous retraction of the independent stretching of classification |
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