CN102840123B - Twin-tub pumping system Anti-moving closing method, twin-tub pumping system and pumping equipment - Google Patents
Twin-tub pumping system Anti-moving closing method, twin-tub pumping system and pumping equipment Download PDFInfo
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- CN102840123B CN102840123B CN201210349195.1A CN201210349195A CN102840123B CN 102840123 B CN102840123 B CN 102840123B CN 201210349195 A CN201210349195 A CN 201210349195A CN 102840123 B CN102840123 B CN 102840123B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
- F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
- F04B9/1172—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each pump piston in the two directions being obtained by a double-acting piston liquid motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
- F04B49/106—Responsive to pumped volume
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
- F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
- F04B9/1172—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each pump piston in the two directions being obtained by a double-acting piston liquid motor
- F04B9/1174—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each pump piston in the two directions being obtained by a double-acting piston liquid motor with fluid-actuated inlet or outlet valve
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
Twin-tub pumping system Anti-moving closing method, described twin-tub pumping system comprises and has two master cylinders (4,5) twin-tub pumping installations and the hydraulic control system of this twin-tub pumping installations, described closing method comprises: the first, controls described twin-tub pumping installations and stops pumpdown; The second, the rod chamber of described two master cylinders (4,5) is communicated with fuel tank or oil return circuit with at least one chamber in rodless cavity.In addition, the present invention also provides a kind of twin-tub pumping system and pumping equipment.The present invention its on the basis of existing twin-tub pumping system, increase release step originally, thus each chamber of the master cylinder of twin-tub pumping system can be made to be in low pressure or passive state, effectively prevent master cylinder piston rod because close high pressure oil and the play that meets accident, ensure that the safety of maintainer in the repair and maintenance working procedure of twin-tub pumping system relative efficiency.
Description
Technical field
The present invention relates to a kind of twin-tub pumping system control method, particularly, relate to a kind of twin-tub pumping system Anti-moving closing method.Further, the present invention relates to a kind of twin-tub pumping system that can realize described Anti-moving closing method.In addition, the invention still further relates to a kind of pumping equipment comprising described twin-tub pumping system.
Background technique
The sticky material such as concrete, mud is the structural material that engineering construction field is commonly used, and these sticky materials carry out pumping typically via twin-tub pumping system, and described twin-tub pumping system generally comprises twin-tub pumping installations and hydraulic control system thereof.With regard to twin-tub pumping installations wherein, its main structure can with reference to Concrete Double cylinder pumping installations widely used in engineering construction, this twin-tub pumping installations by the control of its hydraulic control system, thus utilizes pressure by sticky material along pipeline continus convergence.Particularly, described twin-tub pumping system generally can be driven oil hydraulic pump to be formed to have by motor (or internal-combustion engine) hydraulic oil of certain pressure, master cylinder is driven to drive two to carry the piston in cylinder to produce alternate reciprocating motion, make sticky material constantly suck conveying cylinder from hopper, and be transported to job site by conveyance conduit.
In order to help to understand, to make brief of the introduction the main structure of described twin-tub pumping system and shortcoming thereof for Concrete Double cylinder pumping installations and hydraulic control system thereof referring to Fig. 1 and Fig. 2.
Particularly, see Fig. 1, Concrete Double cylinder pumping installations generally comprises two master cylinders 4,5(is also referred to as " master hydraulic cylinder "), two conveyings cylinder (those skilled in the art are also referred to as " concrete cylinder "), two pumping pistons 12,13, two oscillating oil cylinders, hopper and distributing valves, wherein do not show in the Fig. 1 such as oscillating oil cylinder, hopper, distributing valve, it belongs to well-known components, hereafter repeat no more, these parts are assembled together, and form Concrete Double cylinder pumping installations.With regard to the hydraulic control system of this Concrete Double cylinder pumping installations, mainly refer to and be connected to corresponding hydraulic control circuit on master cylinder and oscillating oil cylinder.
As shown in Figure 1, above-mentioned two master cylinders 4, rod chamber A, C of 5 are interconnected, rodless cavity B, D are connected to main reversing valve 3, this main reversing valve 3 is connected to oil-feed oil circuit and fuel tank, and optionally make the rodless cavity D of the first master cylinder 4 in two master cylinders be communicated with oil-feed oil circuit by the commutation of main reversing valve 3, the rodless cavity B of the second master cylinder 5 is communicated with fuel tank, or make the rodless cavity D of the first master cylinder 4 be communicated with fuel tank, the rodless cavity B of the second master cylinder 5 is communicated with oil-feed oil circuit.Due to two master cylinders 4, the rod chamber A of 5, C is interconnected and is closed with hydraulic oil, the rod chamber A of these two master cylinders 4,5, the hydraulic oil in C plays the effect of driving medium, by alternately to two master cylinders 4, the rodless cavity B of 5, D oil-feed thus the alternately flexible of two master cylinders 4,5 can be realized.Two pumping pistons 12,13 to lay respectively in described two conveying cylinders and respectively with master cylinder 4, the piston rod of 5 connects to drive the alternating motion of corresponding pumping piston 12,13, such as, with alternately pumping or suction sticky material, concrete.
In addition, some detailed structure more specifically showing existing concrete twin-tub pumping installations in Fig. 1, particularly, pumping piston 12, the outer circumferential face of 13 is separately installed with the Sealing 14,15 for carrying the inner peripheral surface sealing of cylinder to be slidably matched accordingly.Two master cylinders 4,5 and two carry between cylinder water tank 16 be installed, the piston rod of these two master cylinders 4,5 is connected to corresponding pumping piston 12 through water tank 16,13, in pumpdown process, two pumping pistons 12,13 are alternately flexible in corresponding conveying cylinder, and wherein water tank 16 is mainly used in cooling, due to pumping piston 12,13 ceaselessly rub with corresponding conveying cylinder, like this can by the cooling water in water tank 16 or cooling liquid to pumping piston 12, and 13 play cooling action.Main reversing valve 3 in the hydraulic control system of above-mentioned Concrete Double cylinder pumping installations is connected to oil-feed oil circuit; know for those skilled in the art; oil-feed oil circuit generally comprises the oil hydraulic pump 1 driven by power plant (motor or motor etc.); wherein the inlet opening of oil hydraulic pump 1 is communicated with fuel tank; delivery outlet is connected to the oil inlet P of main reversing valve 3; oil circuit between the delivery outlet of oil hydraulic pump 1 and the oil inlet P of main reversing valve 3 is generally also connected with the overflow oil circuit comprising relief valve 2, to carry out overvoltage protection.
Further, two master cylinders 4,5 are also connected to buffering is communicated with oil circuit, each master cylinder 4 i.e., the region at the close two ends of the cylinder barrel of 5 is connected to buffering oil circuit, namely in Fig. 1, the first stop valve 6(that is provided with of the left end region of the first master cylinder 4 typically is ball valve) and one-way valve 8 rodless cavity buffering oil circuit, right end region be provided with one-way valve 10 rod chamber buffering oil circuit; The second stop valve 7(that is provided with of the left end region of the second master cylinder 5 typically is ball valve) and one-way valve 9 rodless cavity buffering oil circuit, right end region be provided with one-way valve 11 rod chamber buffering oil circuit.This buffering oil circuit often adopts on the Concrete Double cylinder pumping installations of prior art, and its piston rod being mainly used in master cylinder cushions in fore and aft motion process, prevents the piston of master cylinder at the cylinder barrel of the terminal hard hit master cylinder of flexible stroke.Such as, with regard to the first master cylinder 4 cushioning the operating process of oil circuit, when the rod chamber C oil-feed of the first master cylinder 4, during rodless cavity D oil return, the piston rod of the first master cylinder 4 moves towards left side, when running to left end region close to cylinder bottom, now the two ends of rodless cavity buffering oil circuit are communicated with rod chamber C with the rodless cavity D of the first master cylinder 4 respectively, if the oil pressure of rod chamber C is too high and the movement velocity of piston rod is too fast, the first stop valve 6 can be opened, the oil of the section hydraulic in the rod chamber C of the first master cylinder 4 is made to flow to rodless cavity D via one-way valve 8 and the first stop valve 6, thus the oil pressure in rodless cavity D is increased to a certain extent, increase the resistance to motion of the piston rod of the first master cylinder 4, thus make the piston rod of the first master cylinder 4 can move to the terminal of retraction stroke relatively lenitively, avoid too violent shock cylinder bottom.Similarly, with regard to the rod chamber buffering oil circuit of the right end region of the first master cylinder 4, because the piston rod of the first master cylinder 4 pushes concrete for outwards powerful in the process of stretching out, therefore oil pressure is larger, so right-hand member rod chamber buffering oil circuit is only provided with one-way valve 10, the two ends cushioning oil circuit once the piston movement on the piston rod of the first master cylinder 4 to rod chamber are communicated with rod chamber C and rodless cavity D, namely rod chamber buffering oil circuit plays the effect same with aforesaid operations process, does not repeat them here.In addition, each buffering oil circuit above-mentioned is generally also provided with throttle valve, and it mainly limits buffer traffic, avoids the hydraulic fluid flow rate between rodless cavity D and rod chamber C excessive.
Describe the main structure of twin-tub pumping system above for Concrete Double cylinder pumping system with reference to Fig. 1, it should be noted that at this, two master cylinders 4,5 are not limited to the master cylinder of two shown in Fig. 14, the rod chamber A of 5, C is interconnected the situation forming communicated cavity, selectively, also two master cylinders 4 can be adopted, the rodless cavity B of 5, D is interconnected and forms the structural type of communicated cavity, in this case two master cylinders 4, the rod chamber A of 5, C forms actuator chamber respectively and is connected with selector valve.In actual twin-tub pumping installations, two master cylinders 4, the rodless cavity B of 5, D or rod chamber A, C can by switching optionally as communicated cavity, this is generally realized by the high/low pressure cut-over valve that twin-tub pumping system (such as Concrete Double cylinder pumping system) is conventional, the high/low pressure cut-over valve that such as, employing shown in Fig. 2 six two-way plug-in valves are formed.It should be noted that at this, the high/low pressure cut-over valve adopted in twin-tub pumping system can have various ways, and is not limited to the concrete form shown in Fig. 2.
But, there is certain potential safety hazard when the twin-tub pumping system of above-mentioned prior art exists Maintenance and Repair, easily security incident occur.
Particularly; shown in Figure 1; the sticky material (such as concrete) of the pumping for preventing flows backwards; when main reversing valve 3 is in meta; actuator port A, B of main reversing valve 3 are cut-off (main reversing valve 3 namely adopted in Fig. 2 are M type three position four-way directional control valve), therefore, when stopping pumping; hydraulic oil in the rod chamber A of the rod chamber C of the first master cylinder 4 and rodless cavity D and the second master cylinder 5 and rodless cavity B is closed, often has high pressure oil and is enclosed in above-mentioned rod chamber and rodless cavity.Even if sometimes shut down; high pressure oil also can not release very soon; this can bring certain potential safety hazard; particularly when safeguarding and keep in repair; this high pressure liquid force feed be enclosed in rod chamber and rodless cavity may make the piston rod play forward of master cylinder in Maintenance and Repair operating process, the handling safety of critical repair and maintenance personnel.
With in the twin-tub pumping system of high/low pressure cut-over valve, this because of high pressure oil, to close the safety problem brought even more serious.Such as, shown in Figure 2, wherein the hydraulic control system of twin-tub pumping installations adopts the high/low pressure cut-over valve be made up of six two-way plug-in valve 17-22, wherein three two-way plug-in valves 17, 18, the hydraulic control hydraulic fluid port of 19 is communicated with the first actuator port A1 of two-position four-way solenoid directional control valve 23, three two-way plug-in valves 20, 21, the hydraulic control hydraulic fluid port of 22 is communicated with the second actuator port B1 of two-position four-way solenoid directional control valve 23, the return opening of solenoid directional control valve 23 is connected to oil cylinder, filler opening by oil circuit respectively via one-way valve 24, 25 are connected to pumping oil circuit and distribute on oil circuit, thus the hydraulic control oil of the relatively high hydraulic oil of oil pressure as above-mentioned two-way plug-in valve can be introduced from pumping oil circuit or distribution oil circuit, to realize the high low pressure conversion of twin-tub pumping installations (such as Concrete Double cylinder pumping installations).When solenoid directional control valve 23 electromagnet DT1 dead electricity and when making solenoid directional control valve 23 be in left position, two-way plug-in valve 20, 21, the liquid controling cavity of 22 is pinned by hydraulic control oil, two-way plug-in valve 17, 18, the liquid controling cavity of 19 is communicated with fuel tank, these three two-way plug-in valves 17, 18, 19 at two master cylinders 4, open under the effect of the hydraulic oil in the working oil path of 5, wherein master cylinder 4, the rodless cavity of 5 inserts valve 18 by two-way and is communicated with, when main reversing valve 3 is in left position, the hydraulic oil of the first actuator port A of main reversing valve 3 inputs the rod chamber A of master cylinder 5 via two-way plug-in valve 19, the backhaul hydraulic oil of the rod chamber C of master cylinder 4 flow back into the second actuator port B of main reversing valve 3 via two-way plug-in valve 17, when main reversing valve 3 is in right position, the hydraulic oil of the second actuator port B of main reversing valve 3 is input to the rod chamber C of master cylinder 4 via two-way plug-in valve 17, backhaul hydraulic oil in the rod chamber A of master cylinder 5 flow back into the second actuator port A of main reversing valve 3 via two-way plug-in valve 19, realize the low pressure pumping state of twin-tub pumping system thus (now due to master cylinder 4, the rod chamber of 5 in telescopic process alternately as actuator chamber, in rod chamber, the hydraulic oil effective active area of main oil cylinder piston is relatively little, the pumping force that same oil pressure produces is relatively little, i.e. so-called low pressure pumping state).When electromagnet DT1 obtains electric, when solenoid directional control valve 23 is in right position, the liquid controling cavity of two-way plug-in valve 17,18,19 is pinned by hydraulic control oil, the liquid controling cavity of two-way plug-in valve 20,21,22 is communicated with fuel tank, master cylinder 4, the rodless cavity D of 5, B is communicated with actuator port A, B of main reversing valve respectively by two-way plug-in valve 20,22, rod chamber A, C are communicated with each other by two-way plug-in valve 21, and at this moment twin-tub pumping system is in high pressure pumping state.
As previously mentioned, when stopping pumping, may have High-pressure oil sealing in the rod chamber A of the rod chamber C of the first master cylinder 4 and rodless cavity D and the second master cylinder 5 and rodless cavity B closes interior, particularly at replacing pumping piston 12, the Sealing 14 of 13, when 15, need first close stop valve 6, 7, drive master cylinder 4 again, 5, make pumping piston 12, 13 alternately return to water tank 16 respectively, due at this moment master cylinder 4, the piston of 5 falls back on limit position, system pressure can sharply rise, at this moment stop driving, the hydraulic oil having high oil pressure is enclosed in master cylinder 4, in some chamber of 5.At this moment; if shut down; due to pumping oil circuit and the equal off-load of distribution oil circuit; liquid controling cavity on six cartridge valves is all without pilot pressure; under the effect of master cylinder internal pressure oil; cartridge valve can be opened, and causes master cylinder 4, and rod chamber, the rodless cavity of 5 are all communicated with; due to the flowing of fluid; usually can cause master cylinder 4, the piston rod play forward of 5, after being embodied in shutdown; pumping piston 12; 13 meetings play one segment distance forward, and the flowing of this hydraulic oil usually reliably can not eliminate oil pressure, still may there is potential safety hazard when maintainer keeps in repair.In addition, if play is apart from excessive, pumping piston may be caused to reenter conveying cylinder, thus cannot piston seal be changed.
For addressing this problem; the following scheme of normal employing in prior art: shown in Figure 2; during shutdown, make hydraulic control system not dead electricity, distribute the accumulator not automatic deloading of oil circuit; therefore; the liquid controling cavity of three cartridge valves in cartridge valve has pressure all the time, and system high low pressure state remains unchanged, therefore; can not cause master cylinder 4, the rod chamber of 5 is communicated with rodless cavity.Now, then drive master cylinder, make oil cylinder each chamber off-load, more manually will distribute the accumulator drain charge of oil circuit.
But prior art requires higher to operator, when operating procedure is wrong, easily causes security incident.Distribute the not automatic deloading of oil circuit accumulator, there is certain potential safety hazard equally, also do not meet concerned countries standard-required.In addition, if keeping in repair, maintenance time hydraulic system not dead electricity, likely cause the potential safety hazards such as actuator's misoperation.
Because the above-mentioned defect of prior art, need to provide a kind of shutdown operation method that can effectively solve or alleviate the twin-tub pumping system of the problems referred to above.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of twin-tub pumping system Anti-moving closing method, and this twin-tub pumping system Anti-moving closing method can avoid the piston rod play after a shutdown of master cylinder effectively, thus guarantees the safety of repair and maintenance work.
Further, technical problem to be solved by this invention is to provide a kind of twin-tub pumping system, and this twin-tub pumping system can realize the piston rod Anti-moving function after a shutdown of master cylinder relative efficiency, thus guarantees the safety of repair and maintenance work.
In addition, technical problem to be solved by this invention is to provide a kind of pumping equipment, and the twin-tub pumping system of this pumping equipment can realize the piston rod Anti-moving function after a shutdown of master cylinder relative efficiency, thus guarantees the safety of repair and maintenance work.
In order to solve the problems of the technologies described above, the invention provides a kind of twin-tub pumping system Anti-moving closing method, described twin-tub pumping system comprises and has the twin-tub pumping installations of two master cylinders and the hydraulic control system of this twin-tub pumping installations, described closing method comprises the steps: first, control described twin-tub pumping installations and stop pumpdown, thus make the rod chamber of described two master cylinders and rodless cavity and oil-feed oil circuit and oil return circuit all be in cut-off state; The second, the rod chamber of described two master cylinders is communicated with fuel tank or oil return circuit with at least one chamber in rodless cavity.
Preferably, in described second step, the rod chamber of described two master cylinders is made to be communicated with the scheduled time with at least one chamber in rodless cavity with fuel tank or oil return circuit.
Specifically selectively, the described scheduled time is 1-5 second.
Preferably, in described first step, control described twin-tub pumping installations and switch to stop pumpdown under low pressure pumping state.
Preferably, in described first step, when a pumping piston of described twin-tub pumping installations stops in the water tank of this twin-tub pumping installations, control described twin-tub pumping installations and stop pumpdown.
More preferably, in described first step, when detecting that a pumping piston of described twin-tub pumping installations stops in described water tank, controlling described twin-tub pumping installations and stopping pumpdown.
Typically, described twin-tub pumping system is Concrete Double cylinder pumping system, and described twin-tub pumping installations is Concrete Double cylinder pumping installations.
Preferably, in described second step, whole rod chamber of the master cylinder of described twin-tub pumping installations is communicated with fuel tank or oil return circuit with rodless cavity.
On the basis of the technological scheme of above-mentioned closing method, the invention provides a kind of twin-tub pumping system, comprise twin-tub pumping installations and hydraulic control system thereof, described twin-tub pumping installations comprises two master cylinders, wherein, described hydraulic control system also comprises release oil circuit, one end of this release oil circuit is connected to fuel tank or oil return circuit, the other end is connected at least one chamber in the rod chamber of described two master cylinders and rodless cavity via corresponding oil circuit, described release oil circuit is provided with switch valve, be communicated with fuel tank or oil return circuit with at least one chamber in rodless cavity so that the rod chamber of described master cylinder can be controlled when described twin-tub pumping system-down.
Typically, described hydraulic control system comprises main reversing valve and high/low pressure cut-over valve, and each interface of this high/low pressure cut-over valve is connected to the first actuator port and second actuator port of the respective rod chamber of described two master cylinders and rodless cavity and described main reversing valve.
Specifically selectively, described main reversing valve is M type three position four-way directional control valve or O type three position four-way directional control valve, the filler opening of this main reversing valve is connected to pumping oil circuit, return opening is connected to fuel tank, and the first actuator port and the second actuator port are connected described two master cylinders via described high/low pressure cut-over valve respectively.
Typically, described high/low pressure cut-over valve comprises the first to the 6th two-way plug-in valve, the hydraulic control mouth of this first to the 6th two-way plug-in valve is connected to hydraulic control oil circuit, described hydraulic control oil circuit comprises two-position four way change valve, the filler opening of this two-position four way change valve is connected to the pumping oil circuit of described hydraulic control system via an one-way valve respectively and distributes oil circuit, return opening is connected to fuel tank, first actuator port is connected to the hydraulic control mouth of described 4th to the 6th two-way plug-in valve, second actuator port is connected to the hydraulic control mouth of the described first to the 3rd two-way plug-in valve, wherein two described one-way valves reverse port is separately communicated with the filler opening of described two-position four way change valve.
Preferably, on any one oil circuit during the other end of described release oil circuit is connected between described high/low pressure cut-over valve and described two master cylinders oil circuit.
As another kind of preferred form, the other end of described release oil circuit is connected to the reverse port of the first one-way valve and the second one-way valve, the forward port of described first one-way valve is connected to the second actuator port of described main reversing valve, and the forward port of described second one-way valve is connected to the first actuator port of described main reversing valve.
Preferably, the switch valve on described release oil circuit is electrically switchable grating valve.
Specifically selectively, described electrically switchable grating valve is bi-bit bi-pass solenoid directional control valve open in usual or Normally closed type bi-bit bi-pass solenoid directional control valve.
More preferably, in the water tank of described twin-tub pumping installations, whether the pumping piston be provided with for detecting this twin-tub pumping installations is positioned at the position detecting device of described water tank.
In addition, the present invention also provides a kind of pumping equipment, and wherein, this pumping equipment comprises the twin-tub pumping system described in above-mentioned arbitrary technological scheme.
Pass through technique scheme; twin-tub pumping system Anti-moving the closing method of the present invention and twin-tub pumping system of this closing method can be realized; it increases a release step originally on the basis of existing twin-tub pumping system-down method; thus each chamber of the master cylinder of twin-tub pumping system can be made to be in low pressure or passive state; effectively prevent master cylinder piston rod because close high pressure oil and the play that meets accident, ensure that the safety of maintainer in the repair and maintenance working procedure of twin-tub pumping system relative efficiency.Twin-tub pumping system Anti-moving closing method of the present invention has applicability at large; especially effectively can be applicable to have in the twin-tub pumping system of high/low pressure cut-over valve; the play of main oil cylinder piston bar when it relatively reliably prevents twin-tub pumping system-down; making each cavity pressure of twin-tub pumping system removal master cylinder effectively when shutting down, making twin-tub pumping system safer.Pumping equipment of the present invention comprises described twin-tub pumping system, and therefore it has above-mentioned advantage equally.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Following accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, and itself and following embodiment one are used from explanation the present invention, but protection scope of the present invention is not limited to following the drawings and the specific embodiments.In the accompanying drawings:
Fig. 1 is the schematic diagram of the twin-tub pumping system of prior art, which show twin-tub pumping installations and the hydraulic control system thereof of this twin-tub pumping system.
Fig. 2 is the schematic diagram of twin-tub pumping system in prior art, has additional high/low pressure cut-over valve in wherein said hydraulic control system.
Fig. 3 is the structure principle chart of the twin-tub pumping system of the first embodiment of the present invention.
Fig. 4 is the structure principle chart of the twin-tub pumping system of the second embodiment of the present invention.
Fig. 5 is the structure principle chart of the twin-tub pumping system of the third embodiment of the present invention.
Fig. 6 is the structure principle chart of the twin-tub pumping system of the present invention's the 4th kind of embodiment.
Fig. 7 is the step block diagram of twin-tub pumping system Anti-moving closing method of the present invention.
Description of reference numerals:
1 oil hydraulic pump; 2 relief valves;
3 main reversing valves; 4 master cylinders;
5 master cylinders; 6 first stop valves;
7 second stop valves; 8,9,10,11 one-way valves;
12 pumping pistons; 13 pumping pistons;
14 Sealings; 15 Sealings;
16 water tanks; 17 first two-way plug-in valves;
18 second two-way plug-in valves; 19 the 3rd two-way plug-in valves;
20 the 4th two-way plug-in valves; 21 the 5th two-way plug-in valves;
22 the 6th two-way plug-in valves; 23 four-way electromagnetic reversing valves;
24,25 one-way valves; 26 bi-bit bi-pass solenoid directional control valves open in usual;
27 first one-way valves; 28 second one-way valves;
29 Normally closed type bi-bit bi-pass solenoid directional control valves; 30 primary importance detection devices;
31 second place detection devices; 32 high/low pressure cut-over valves;
33 release oil circuits.
Embodiment
Be described in detail to the specific embodiment of the present invention below in conjunction with accompanying drawing, should be understood that, embodiment described herein is only for instruction and explanation of the present invention, and protection scope of the present invention is not limited to following embodiment.
Definitely in order to make the description of embodiment specifically it will be appreciated by those skilled in the art that mainly describe the specific embodiment of the present invention for Concrete Double cylinder pumping system below to facilitate.Correspondingly, twin-tub pumping system Anti-moving closing method of the present invention in the following description can be called " Concrete Double cylinder pumping system Anti-moving closing method ", twin-tub pumping system can be called " Concrete Double cylinder pumping system ", but for those skilled in the art apparently, due to twin-tub pumping installations of the present invention and the main structure of hydraulic control system thereof and the similar of Concrete Double cylinder pumping installations and hydraulic control system thereof, the shutdown that following embodiment can be applicable to generality fluid foods twin-tub pumping system controls, such as mud, the control of the twin-tub pumping systems such as mortar.
About the structural type of Concrete Double cylinder pumping installations and hydraulic control system itself thereof is known for those skilled in the art, make brief of the introduction hereinbefore, therefore, in the description of hereafter technological scheme of the present invention, the introduction of omitting known features is stressed that key technology of the present invention is conceived.In addition, eliminate some other well-known components of Concrete Double cylinder pumping installations in Fig. 4 to Fig. 6, such as distributing valve, oscillating oil cylinder, hopper etc., but do not affect the understanding of those skilled in the art to technical solution of the present invention.About the differentiation of " first " and " second " etc., only use for convenience of description, it does not form limiting the scope of the invention.
First the embodiment of twin-tub pumping system Anti-moving closing method of the present invention is below described; and then the embodiment of twin-tub pumping system of the present invention is described; in the course of the description, the operating process of subsidiary description being correlated with, the typical hydraulic device adopted and some possible variant.
Shown in Figure 7, twin-tub pumping system Anti-moving closing method of the present invention is applicable to twin-tub pumping system, described twin-tub pumping system comprises and has two master cylinders 4, the twin-tub pumping installations of 5 and the hydraulic control system of this twin-tub pumping installations, described twin-tub pumping system Anti-moving closing method comprises: first step, the twin-tub pumping installations controlling described twin-tub pumping system stops pumpdown, thus the rod chamber of two master cylinders 4,5 described in when stopping pumpdown and rodless cavity and oil-feed oil circuit and oil return circuit are all in cut-off state; Second step, makes the described rod chamber of two master cylinders 4,5 be communicated with fuel tank or oil return circuit with at least one chamber in rodless cavity.
Preferably, in this second step, described two master cylinders 4 can be made, the rod chamber of 5 and at least one chamber in rodless cavity are communicated with the scheduled time (such as 1-5 second) with fuel tank or oil return circuit, this can prevent the material in material conveying pipe effectively, and such as concrete flows backwards (referring to the description of hereafter twin-tub pumping system).In addition, be directly connected with fuel tank although Fig. 3 to Fig. 6 all shows release oil circuit 33, for those skilled in the art apparently, release oil circuit 33 is connected with the oil return circuit of fuel tank or hydraulic control system, all can play the object of release.
It will be appreciated that at this, no matter high pressure pumping state or the low pressure pumping state of twin-tub pumping installations, when stopping pumpdown why at two master cylinders 4, low pressure oil or high pressure oil can be closed with in the rod chamber of 5 and rodless cavity, concrete reason is as follows: such as, shown in Figure 3, if now twin-tub pumping installations is in low pressure pumping state, suppose the rod chamber C oil-feed of now the first master cylinder 4, the rod chamber A oil return of the second master cylinder 5, the rodless cavity B of the first master cylinder 4 and the second master cylinder 5, D is as communicated cavity, pumpdown is stopped when the piston rod of the first master cylinder 5 has moved to left end precalculated position in figure 3, main reversing valve 3 is switched to meta fast, the rod chamber C oil-feed of the first master cylinder 4 stops, the rod chamber A oil return of the second master cylinder 5 ends equally, but the first and second master cylinders 4, the piston rod of 5 has motional inertia, it keeps proal inertia, thus the hydraulic oil pressurized of the rod chamber A of the second master cylinder 5 stops the first and second master cylinders 4, the motion of the piston rod of 5, first and second master cylinders 4, the piston rod of 5 stops instantaneously, by the rod chamber C of the first master cylinder 4, the rodless cavity B of the first master cylinder 4 and the second master cylinder 5, the communicated cavity that D is formed, and first the hydraulic oil of corresponding oil pressure of rod chamber C inner sealing of master cylinder 4 to the first and second master cylinders 4, the effect of the piston rod of 5 forms equilibrium of forces, two master cylinders 4, 5 actually define a fluid pressure linkage structure.In this case, although each rod chamber of two master cylinders 4,5 and the hydraulic oil of rodless cavity inner sealing all have oil pressure, as long as to any one chamber release, then other chamber due to equilibrium of forces also can release.Therefore, only need make any one the chamber release in the rod chamber of two master cylinders 4,5 and rodless cavity when stopping pumpdown, object of the present invention can be realized.
Particularly, for example, see shown in Fig. 3, if now twin-tub pumping installations is in low pressure pumping state, suppose the rod chamber C oil-feed of now the first master cylinder 4, the rod chamber A oil return of the second master cylinder 5, the rodless cavity B of the first master cylinder 4 and the second master cylinder 5, D is as communicated cavity, when stopping pumpdown, hopper is feed no longer, because oil pressure depends on load, the hydraulic oil in the rod chamber C of the first master cylinder 4 needs two piston rods of driving first master cylinder 4 and the second master cylinder 5, and therefore oil pressure is the highest, communicated cavity (the i.e. rodless cavity B of the first master cylinder 4 and the second master cylinder 5, D) hydraulic oil in only needs the piston rod of driving second master cylinder 5, the effective active area of hydraulic oil to piston rod simultaneously in rodless cavity is larger, therefore the oil pressure in communicated cavity is in lower state, but there is certain oil pressure (can be called medium oil pressure), the rod chamber A of the second master cylinder 5 is communicated with fuel tank via main reversing valve 3, oil pressure minimum (being approximately zero), if make twin-tub pumping installations shut down when the left end precalculated position shown in piston rod movement Fig. 3 of the first master cylinder 4, as mentioned above, the rod chamber A of the second master cylinder 5 stops oil return, the piston rod of the second master cylinder 5 makes the hydraulic oil pressurized in the rod chamber A of the second master cylinder 5 due to motional inertia thus forms oil pressure, oil pressure in the rod chamber A of i.e. the second master cylinder 5 increases instantaneously, the rod chamber C of the first master cylinder 4, the oil pressure of the rod chamber A of described communicated cavity and the second master cylinder 5 piston portion to the piston rod of the first master cylinder 4 and the second master cylinder 5 applies active force, stop under making the piston rod of the first master cylinder 4 and the second master cylinder 5 be in equilibrium of forces state.In this case, in order to prevent being enclosed in master cylinder 4, in repair and maintenance process, because of accidental cause, disequilibrium causes piston rod play to the oil pressure of the hydraulic oil in 5, and need master cylinder 4, the oil pressure in 5 sheds.Under high pressure pumping state, similar during corresponding oil pressure state of changing, do not repeat them here.
In order to ensure preventing piston rod play, when release, generally can make two master cylinders 4, oil pressure in arbitrary chamber in the rod chamber of 5 and rodless cavity is laid down, due to fluid pressure linkage structure and the equilibrium of forces of the piston rod of two master cylinders 4,5, the oil pressure in other chamber can nature removal.Therefore; within the scope of above-mentioned technical conceive of the present invention, as long as according to operating mode during double pump pumping installations stopping stock operation, make master cylinder 4; the oil pressure of the hydraulic oil of any or all the chamber inner sealing in the rod chamber of 5 and rodless cavity is laid down, and it all belongs to protection scope of the present invention.Most preferably, the master cylinder 4 of twin-tub pumping installations can be made, whole rod chamber of 5 is communicated with fuel tank or oil return circuit with rodless cavity, this the most reliably can prevent play, prevent from making the non-removal of the oil pressure of some chamber in the rod chamber of two master cylinders 4,5 or rodless cavity because of accidental cause.
Within the scope of the technical conceive of above-mentioned Anti-moving closing method of the present invention, when controlling twin-tub pumping installations and stopping pumping, can, by controlling (such as by high/low pressure cut-over valve 32), twin-tub pumping installations be shut down under low pressure pumping state.As mentioned above; when subject matter due to prior art existence is shutdown, the piston rod of the first master cylinder 4 or the second master cylinder 5 because play occur high oil pressure, may cause the Sealing 14 of replacing first and second pumping piston 12,13; when 15, there is potential safety hazard.At the mixed Sealing 14 of replacing, when 15, driving first and second master cylinder 4,5(is needed generally to take crawl mode of operation), make corresponding pumping piston return to water tank 16.When crawl first and second master cylinder 4 under high pressure pumping state, when 5, when master cylinder 4,5 put in place after, master cylinder 4, there is relatively high oil pressure (can be such as rod chamber A, the rodless cavity B of the second master cylinder 5 in Fig. 3 and the rod chamber C of the first master cylinder) in three chambeies of 5.When crawl master cylinder in a low voltage state, master cylinder 4, only has a chamber to there is high pressure (with reference to analyzing, such as, can be the rod chamber C of the first master cylinder shown in Fig. 3) above in the rod chamber of 5 and rodless cavity.Therefore, when shutting down under high pressure conditions, pump oil cylinder piston rod play possibility is larger, and when shutting down under low-pressure state, piston rod play possibility is less.Therefore, it should be noted that at this, in the technology of the present invention concept, control described twin-tub pumping installations and switch to the technological scheme stopping pumpdown under low pressure pumping state, it both as the preferred control mode of one, also can form one independently control mode.Its as a kind of independent control mode when, as mentioned above, it can reduce the possibility of the piston rod play of the first master cylinder 4 or the second master cylinder 5 effectively, even if it is without any follow-up release step like this, also can solve safety problem in relative efficiency ground.Its as a kind of preferred control mode when, when follow-up unloading oil pressure is to prevent the piston rod play of the first master cylinder 4 or the second master cylinder 5, due to two master cylinders 4 under low pressure pumping state, the overall oil pressure of 5 is relatively low, therefore unload press operation to be more prone to, and Security after release is more reliable.
For the ease of carrying out pumping piston 12, the Sealing 14 of 13, the replacing of 15, preferably, in above-mentioned first step, when a pumping piston 12,13 of described twin-tub pumping installations stops in the water tank 16 of this twin-tub pumping installations, the twin-tub pumping installations controlling described twin-tub pumping system stops pumpdown.For those skilled in the art apparently, due to the first pumping piston 12 and the second pumping piston 13 alternating motion, a pumping piston 12 or 13 therefore once only can be made to stop in water tank 16.Further preferably, on the basis of technique scheme, corresponding detecting step can be increased, namely a pumping piston 12 of described twin-tub pumping installations is being detected, 13 when stopping in the water tank 16 of this twin-tub pumping installations, and the twin-tub pumping installations controlling described twin-tub pumping system stops pumpdown.
In addition, within the scope of the above-mentioned technical conceive of twin-tub pumping system-down method of the present invention, preferably, the described rod chamber of two master cylinders 4,5 and at least one chamber in rodless cavity is made to be communicated with the time of 1-5 second with fuel tank or oil return circuit.
The foregoing describing the embodiment of twin-tub pumping system Anti-moving closing method of the present invention, below describing the embodiment of the twin-tub pumping system for realizing above-mentioned closing method.It is emphasized that because the twin-tub pumping installations of twin-tub pumping system and the structure of hydraulic control system thereof are known at this, therefore hereafter known structure or element are repeated no more, and only describe the structure embodying the technology of the present invention design.
See Fig. 3 to Fig. 6, twin-tub pumping system of the present invention comprises twin-tub pumping installations and hydraulic control system thereof, described twin-tub pumping installations comprises two master cylinders 4, 5, wherein, described hydraulic control system also comprises release oil circuit 33, one end of this release oil circuit 33 is connected to fuel tank or oil return circuit, the other end is connected to described two master cylinders 4 via corresponding oil circuit, at least one chamber in the rod chamber of 5 and rodless cavity, described release oil circuit 33 is provided with switch valve, so that described master cylinder 4 can be controlled when described twin-tub pumping system-down, the rod chamber of 5 is communicated with fuel tank or oil return circuit with at least one chamber in rodless cavity.
It will be appreciated that, within the scope of technical conceive of the present invention, twin-tub pumping system of the present invention is not limited to the concrete form shown in Fig. 3 to Fig. 6, it can have multiple form of implementation, for example, see shown in Fig. 3, the release oil circuit 33 of switch valve can be connected with respectively at the respective rod chamber of two master cylinders 4,5 and rodless cavity, like this when carrying out release, can the conducting of corresponding release oil circuit 33 be made as required and carry out release.As long as these variant have employed above-mentioned technical conceive of the present invention, it all belongs to protection scope of the present invention.
Concrete each preferred implementation describing twin-tub pumping system of the present invention with reference to Fig. 3 and Fig. 6 below.
See shown in Fig. 3 to Fig. 6, with the twin-tub pumping system class of routine seemingly, described twin-tub pumping system comprises the hydraulic control system of twin-tub pumping installations and this twin-tub pumping installations.About the main structure of twin-tub pumping installations is described in above-mentioned, do not repeat them here.Described hydraulic control system generally comprises main reversing valve 3, well known, the general three position four-way directional control valve of this main reversing valve 3, the oil inlet P of this main reversing valve 3 is connected to pumping oil circuit (i.e. oil-feed oil circuit), oil return inlet T is connected to fuel tank, first actuator port A is connected two master cylinders 4,5 via corresponding oil circuit respectively with the second actuator port B.Know for those skilled in the art; oil-feed oil circuit generally comprises the oil hydraulic pump 1 driven by power plant (motor or motor etc.); wherein the inlet opening of oil hydraulic pump 1 is communicated with fuel tank; delivery outlet is connected to the oil inlet P of main reversing valve 3; oil circuit between the delivery outlet of oil hydraulic pump 1 and the oil inlet P of main reversing valve 3 is generally also connected with the overflow oil circuit comprising relief valve 2, to carry out overvoltage protection.As mentioned above, in order to prevent twin-tub pumping installations material in pumpdown process from flowing backwards, main reversing valve 3 needs to have meta cutoff function, and therefore main reversing valve 3 generally adopts M type three position four-way directional control valve or O type three position four-way directional control valve.
The hydraulic control system of the twin-tub pumping installations shown in Fig. 3 to Fig. 6 includes high/low pressure cut-over valve 32, and namely the first actuator port A of main reversing valve 3 and the second actuator port B is connected to two master cylinders 4, on 5 via high/low pressure cut-over valve 32.Generally speaking, the high/low pressure cut-over valve that can adopt in twin-tub pumping system can have various ways, and its high low pressure being mainly used in realizing twin-tub pumping installations switches.High/low pressure cut-over valve can be formed as the form of combination valve, also the valve of dispersion can be had to be connected by oil circuit, each interface on high/low pressure cut-over valve is connected to the interface of the respective rod chamber of two master cylinders 4,5 and rodless cavity and the first actuator port A of main reversing valve 3 and the second actuator port B via corresponding oil circuit respectively.Such as, in Fig. 3 to Fig. 6, high/low pressure cut-over valve 32 is made up of six two-way plug-in valves, i.e. the first two-way plug-in valve 17, second two-way plug-in valve 18, the 3rd two-way plug-in valve 19, the 4th two-way plug-in valve 20, the 5th two-way plug-in valve 21 and the 6th two-way plug-in valve 22, relevant two-way plug-in valve belongs to the known hydraulic element of Hydraulic Field, does not repeat them here.Wherein the first port of the first two-way plug-in valve 17 is communicated with the second actuator port B of main reversing valve 3, and the second port is communicated with the rod chamber C of the first master cylinder 4; First port of the second two-way plug-in valve 18 is communicated with the rodless cavity B of the second master cylinder 5, and the second port is communicated with the rodless cavity D of the first master cylinder 4; First port of the 3rd two-way plug-in valve 19 is communicated with the first actuator port A of main reversing valve 3, and the second port is communicated with the rod chamber A of the second master cylinder 5; First port of the 4th two-way plug-in valve 20 is communicated with the first actuator port A of main reversing valve 3, and the second port is communicated with the rodless cavity B of the second master cylinder 5; First port of the 5th two-way plug-in valve 21 is communicated with the rod chamber C of the first master cylinder 4, and the second port is communicated with the rod chamber A of the second master cylinder 5; The first interface of the 6th two-way plug-in valve 22 is communicated with the second actuator port B of main reversing valve 3, and the second interface is communicated with the rodless cavity D of the first master cylinder 4.In addition, the hydraulic control mouth of above-mentioned six two-way plug-in valves is connected to hydraulic control oil circuit, particularly, such as in figure 3, hydraulic control oil circuit comprises two-position four way change valve (the two-position four-way solenoid directional control valve 23 such as shown in Fig. 3), the first to the 3rd two-way plug-in valve 17 in above-mentioned six two-way plug-in valves, 18, the hydraulic control mouth of 19 is connected to the second actuator port B1 of two-position four-way solenoid directional control valve 23, 4th to the 6th two-way plug-in valve 20, 21, the hydraulic control mouth of 22 is connected to the first actuator port A1 of two-position four-way solenoid directional control valve 23, the oil inlet P 1 of this two-position four-way solenoid directional control valve is respectively via one-way valve 24, 25 are connected to pumping oil circuit and distribute oil circuit, oil return inlet T 1 is connected to fuel tank, wherein one-way valve 24, the respective reverse port of 25 is communicated with the oil inlet P 1 of two-position four-way solenoid directional control valve, such pumping oil circuit or distribute the oil inlet P 1 that oil pressure is larger on oil circuit hydraulic oil is incorporated into two-position four-way solenoid directional control valve, and optionally control the first to the 3rd two-way plug-in valve 17 by two-position four-way solenoid directional control valve 23, 18, 19 or the 4th to the 6th two-way plug-in valve 20, 21, 22.Certainly, above-mentioned two-position four-way solenoid directional control valve 23 is only the concrete form described for example, it can adopt the selector valve of various ways, as long as the first to the 3rd two-way plug-in valve 17 can be made, 18, the hydraulic control mouth of the hydraulic control mouth of 19 and the 4th to the 6th two-way plug-in valve 20,21,22 is optionally communicated with hydraulic control oil sources.
The concrete form of twin-tub pumping system of the present invention is below described with reference to Fig. 3 to Fig. 6 respectively.
As shown in Figure 3, the switch valve that release oil circuit 33 adopts is bi-bit bi-pass solenoid directional control valve 26 open in usual, one end connected tank of release oil circuit 33, the other end can be connected to high/low pressure cut-over valve 32 and two master cylinders 4, on arbitrary oil circuit between 5 respective rod chambers and rodless cavity, such as the other end of release oil circuit 33 is connected on the oil circuit between high/low pressure cut-over valve 32 and the rodless cavity D of the first master cylinder 4 in figure 3.When twin-tub pumping system works, bi-bit bi-pass solenoid directional control valve 26 open in usual obtains electric, and release oil circuit 33 is in cut-off off state, when shutting down, and bi-bit bi-pass solenoid directional control valve 26 dead electricity open in usual, release oil circuit 33 conducting.At this moment, even if because shutting down, each two-way plug-in valve is opened because not obtaining hydraulic control oil, and hydraulic oil also can unload oil sump tank via bi-bit bi-pass solenoid directional control valve 26 open in usual, can not produce the play of piston rod.
As shown in Figure 4, although the technological scheme shown in Fig. 3 can prevent the play of piston rod, this technological scheme under certain conditions, the pressure in the section chambers in the rod chamber of two master cylinders 4,5 and rodless cavity may because can not lay down in time by accidental cause.As the preferred form of implementation of another kind, shown in Figure 4, the switch valve that release oil circuit 33 adopts is bi-bit bi-pass solenoid directional control valve 26 open in usual, one end connected tank of release oil circuit 33, the other end is connected to the reverse port of the first one-way valve 27 and the second one-way valve 28, the forward port of described first one-way valve 27 is connected to the second actuator port B of main reversing valve 3, and the forward port of the second one-way valve 28 is connected to the first actuator port A of main reversing valve 3, about the forward port of one-way valve, the differentiation of reverse port is known, i.e. forward conduction, direction is ended.Like this, during work, solenoid valve 26 obtains electric, selector valve 3A mouth and B mouth and fuel tank disconnect, system can normally work, during shutdown, bi-bit bi-pass solenoid directional control valve 26 dead electricity open in usual, release oil circuit 33 conducting, two master cylinders 4, the rod chamber of 5 and the hydraulic oil of rodless cavity are when flowing to the first actuator port A and the second actuator port B of main reversing valve 3, fuel tank can be flowed back to via release oil circuit 33 by the first one-way valve 27 or the second one-way valve 28, simultaneously due to the annexation of the first one-way valve 27 and the second one-way valve 28, the hydraulic oil that the preferential release oil pressure of release oil circuit 33 meeting is higher, once the oil pressure dump in section chambers, due to equilibrium of forces, other chamber of master cylinder also can release.
As shown in Figure 5, as the selectable variant of one, bi-bit bi-pass solenoid directional control valve 26 open in usual in Fig. 4 can be replaced by Normally closed type bi-bit bi-pass solenoid directional control valve 29 in Fig. 5, this selectable variant, when twin-tub pumping system worked well, makes Normally closed type bi-bit bi-pass solenoid directional control valve 29 dead electricity and keeps release oil circuit 33 to disconnect.When stopping pumping, Normally closed type bi-bit bi-pass solenoid directional control valve 29 electric thus make the release oil circuit 33 conducting scheduled time (such as 1-5 second), thus the high oil pressure of removal master cylinder 4,5.This selectable variant is owing to making release oil circuit 33 only conducting predetermined time, master cylinder 4, hydraulic oil in 5 can not flow back to fuel tank in a large number, therefore can effectively prevent the off-load due to release oil circuit from causing the material (such as concrete) in conveyance conduit to flow backwards.Certainly, in the mode of execution shown in Fig. 3 and Fig. 4, by controlling the dead electricity time of bi-bit bi-pass solenoid directional control valve 26 open in usual, also can obtain this kind of technique effect, bi-bit bi-pass solenoid directional control valve 26 open in usual can adopt independently control circuit in this case certainly.
Due to the potential safety hazard that the present invention prevents the object of the piston rod play of the master cylinder of twin-tub pumping installations to be mainly when eliminating Inspection and maintenance, such as, changing the Sealing 14 of pumping piston 12,13, the play of piston rod when 15.Therefore, when changing Sealing, pumping piston 12 or 13 must return to water tank 16, water tank 16 whether is positioned at by detecting piston, as shown in Figure 6, preferably, can be provided with in described water tank 16 for detecting pumping piston 12,13 position detecting devices whether being positioned at water tank 16, this position detecting device can comprise the primary importance detection device 30 for detecting pumping piston 12 and the second place detection device 31 for detecting pumping piston 13.Primary importance detection device 30 and second place detection device 31 can adopt multiple known sensor, such as magnetic resistance type linear displacement transducer, Hall transducer etc., certainly in this case, primary importance detection device 30 and second place detection device 31 can be electrically connected on corresponding controller, as long as this controller is electrically connected on Normally closed type bi-bit bi-pass solenoid directional control valve 29(electrically switchable grating valve), thus the SC sigmal control Normally closed type bi-bit bi-pass solenoid directional control valve 29 that controller can detect according to primary importance detection device 30 and second place detection device 31, thus control the ON-OFF of release oil circuit 33.By primary importance detection device 30 and second place detection device 31, detect pumping piston 12, whether 13 return water tank 16, if the corresponding returned water tank 16 of pumping piston, when then stopping pumpdown, make Normally closed type bi-bit bi-pass solenoid directional control valve 29 first electric, release oil circuit 33 conducting, first actuator port A of main reversing valve 3 and each chamber off-load of the second actuator port B and master cylinder, time delay a period of time (such as 2 seconds), Normally closed type bi-bit bi-pass solenoid directional control valve 29 dead electricity, each chamber is closed, but because oil pressure is laid down, what close is low pressure oil.If piston does not return water tank, then no matter pumping whether action, Normally closed type bi-bit bi-pass solenoid directional control valve 29 all must not electricity.
On the basis of the technological scheme of above-mentioned twin-tub pumping system, the present invention also provides a kind of pumping equipment, and this pumping equipment comprises above-mentioned twin-tub pumping system.Typically, described pumping equipment can be concrete mixer.
As can be seen from upper description, the invention has the advantages that: the invention provides a kind of twin-tub pumping system Anti-moving closing method and the twin-tub pumping system of this closing method can be realized, it increases a release step originally on the basis of existing twin-tub pumping system-down method, thus each chamber of the master cylinder of twin-tub pumping system can be made to be in low pressure or passive state, effectively prevent master cylinder piston rod because close high pressure oil and the play that meets accident, ensure that the safety of maintainer in the repair and maintenance working procedure of twin-tub pumping system relative efficiency.Twin-tub pumping system Anti-moving closing method of the present invention has applicability at large; especially effectively can be applicable to have in the twin-tub pumping system of high/low pressure cut-over valve; the play of main oil cylinder piston bar when it relatively reliably prevents twin-tub pumping system-down; making each cavity pressure of twin-tub pumping system removal master cylinder effectively when shutting down, making twin-tub pumping system safer.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present invention; can carry out multiple modification to technological scheme of the present invention, these variant all belong to protection scope of the present invention.Especially, be described for Concrete Double cylinder pumping system although main above, but capable and for realizing the method the twin-tub pumping system of twin-tub pumping system Anti-moving closing method of the present invention is obviously not limited to Concrete Double cylinder pump and send system regions, but can be applicable to generality the control of the twin-tub pumping system for carrying other fluid foods, such as mud, the shutdown of the twin-tub pumping systems such as mortar controls, correspondingly the Concrete Double cylinder pumping system of above-mentioned embodiment the technology of the present invention design also can be formed as the twin-tub pumping system for carrying other sticky material.
It should be noted that in addition, each the concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different mode of execution of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (18)
1. twin-tub pumping system Anti-moving closing method, described twin-tub pumping system comprises and has the twin-tub pumping installations of two master cylinders (4,5) and the hydraulic control system of this twin-tub pumping installations, and described closing method comprises the steps:
The first, control described twin-tub pumping installations and stop pumpdown, thus make the rod chamber of described two master cylinders (4,5) and rodless cavity and oil-feed oil circuit and oil return circuit all be in cut-off state;
The second, the rod chamber of described two master cylinders (4,5) is communicated with fuel tank or oil return circuit with at least one chamber in rodless cavity.
2. closing method according to claim 1, wherein, in described second step, makes the rod chamber of described two master cylinders (4,5) be communicated with the scheduled time with at least one chamber in rodless cavity with fuel tank or oil return circuit.
3. closing method according to claim 2, wherein, the described scheduled time is 1-5 second.
4. closing method according to claim 1, wherein, in described first step, controls described twin-tub pumping installations and switches to stop pumpdown under low pressure pumping state.
5. closing method according to claim 1; wherein; in described first step; at a pumping piston (12 of described twin-tub pumping installations; 13), when in the water tank (16) stopping at this twin-tub pumping installations, control described twin-tub pumping installations and stop pumpdown.
6. closing method according to claim 5; wherein, in described first step, a pumping piston (12 of described twin-tub pumping installations detected; 13), when stopping in described water tank (16), control described twin-tub pumping installations and stop pumpdown.
7. closing method according to claim 1, wherein, described twin-tub pumping system is Concrete Double cylinder pumping system, and described twin-tub pumping installations is Concrete Double cylinder pumping installations.
8. closing method according to any one of claim 1 to 7, wherein, in described second step, makes whole rod chamber of the master cylinder of described twin-tub pumping installations (4,5) be communicated with fuel tank or oil return circuit with rodless cavity.
9. twin-tub pumping system, comprise twin-tub pumping installations and hydraulic control system thereof, described twin-tub pumping installations comprises two master cylinders (4, 5), wherein, described hydraulic control system also comprises release oil circuit (33), one end of this release oil circuit (33) is connected to fuel tank or oil return circuit, the other end is connected to described two master cylinders (4 via corresponding oil circuit, 5) at least one chamber in rod chamber and rodless cavity, described release oil circuit (33) is provided with switch valve, so that described master cylinder (4 can be controlled when described twin-tub pumping system-down, 5) rod chamber is communicated with fuel tank or oil return circuit with at least one chamber in rodless cavity.
10. twin-tub pumping system according to claim 9, wherein, described hydraulic control system comprises main reversing valve (3) and high/low pressure cut-over valve (32), each interface of this high/low pressure cut-over valve (32) is connected to the first actuator port (A) and second actuator port (B) of described two master cylinders (4,5) respective rod chamber and rodless cavity and described main reversing valve (3).
11. twin-tub pumping systems according to claim 10, wherein, described main reversing valve (3) is M type three position four-way directional control valve or O type three position four-way directional control valve, the filler opening (P) of this main reversing valve (3) is connected to pumping oil circuit, return opening (T) is connected to fuel tank, first actuator port (A) and the second actuator port (B) are connected described two master cylinders (4,5) via described high/low pressure cut-over valve (32) respectively.
12. twin-tub pumping systems according to claim 10, wherein, described high/low pressure cut-over valve (32) comprises the first to the 6th two-way plug-in valve (17, 18, 19, 20, 21, 22), this first to the 6th two-way plug-in valve (17, 18, 19, 20, 21, 22) hydraulic control mouth is connected to hydraulic control oil circuit, described hydraulic control oil circuit comprises two-position four way change valve, the filler opening (P1) of this two-position four way change valve is respectively via an one-way valve (24, 25) be connected to the pumping oil circuit of described hydraulic control system and distribute oil circuit, return opening (T1) is connected to fuel tank, first actuator port (A1) is connected to described 4th to the 6th two-way plug-in valve (20, 21, 22) hydraulic control mouth, second actuator port (B1) is connected to the described first to the 3rd two-way plug-in valve (17, 18, 19) hydraulic control mouth, wherein two described one-way valves (24, 25) respective reverse port is communicated with the filler opening (P1) of described two-position four way change valve.
13. twin-tub pumping systems according to claim 10, wherein, the other end of described release oil circuit (33) is connected on any one oil circuit in the oil circuit between described high/low pressure cut-over valve (32) Yu described two master cylinders (4,5).
14. twin-tub pumping systems according to claim 10, wherein, the other end of described release oil circuit (33) is connected to the reverse port of the first one-way valve (27) and the second one-way valve (28), the forward port of described first one-way valve (27) is connected to second actuator port (B) of described main reversing valve (3), and the forward port of described second one-way valve (28) is connected to first actuator port (A) of described main reversing valve (3).
15. twin-tub pumping systems according to any one of claim 9 to 14, wherein, the switch valve on described release oil circuit (33) is electrically switchable grating valve.
16. twin-tub pumping systems according to claim 15, wherein, described electrically switchable grating valve is bi-bit bi-pass solenoid directional control valve (26) open in usual or Normally closed type bi-bit bi-pass solenoid directional control valve (29).
17. twin-tub pumping systems according to claim 15, wherein, whether the pumping piston (12,13) be provided with in the water tank (16) of described twin-tub pumping installations for detecting this twin-tub pumping installations is positioned at the position detecting device of described water tank (16).
18. pumping equipments, wherein, this pumping equipment comprises the twin-tub pumping system according to any one of claim 9 to 17.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210349195.1A CN102840123B (en) | 2012-09-19 | 2012-09-19 | Twin-tub pumping system Anti-moving closing method, twin-tub pumping system and pumping equipment |
| PCT/CN2012/086135 WO2014044000A1 (en) | 2012-09-19 | 2012-12-07 | Jumping-proof stopping method of dual-cylinder pumping system, dual-cylinder pumping system, and pumping equipment |
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| CN201210349195.1A CN102840123B (en) | 2012-09-19 | 2012-09-19 | Twin-tub pumping system Anti-moving closing method, twin-tub pumping system and pumping equipment |
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| CN102840123A CN102840123A (en) | 2012-12-26 |
| CN102840123B true CN102840123B (en) | 2015-09-30 |
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| WO (1) | WO2014044000A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103671315B (en) * | 2013-12-05 | 2016-03-30 | 中联重科股份有限公司 | Concrete pumping system and concrete pumping machinery |
| CN105275899B (en) * | 2014-07-24 | 2017-11-21 | 中联重科股份有限公司 | A kind of concrete pumping equipment hydraulic system and concrete pumping equipment |
| ES2687175T3 (en) * | 2016-04-11 | 2018-10-24 | Epiroc Rock Drills Aktiebolag | Method for transmitting or transporting fluid or semi-fluid materials by means of a double piston pump and double piston pump for it |
| CN105840448A (en) * | 2016-05-30 | 2016-08-10 | 桂林市华力重工机械有限责任公司 | Automatic mud pressure relief system |
| CN105971255B (en) * | 2016-06-28 | 2018-06-05 | 温州市华宁建筑机械有限公司 | double-cylinder piston type mortar spraying machine |
| CN112324719B (en) * | 2020-11-04 | 2023-07-14 | 北京自动化控制设备研究所 | Redundancy electro-hydrostatic actuation system and control method |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102840123A (en) | 2012-12-26 |
| WO2014044000A1 (en) | 2014-03-27 |
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