CN102840123A - Anti-channeling shutdown method for double-cylinder pumping system, double-cylinder pumping system and pumping equipment - Google Patents

Anti-channeling shutdown method for double-cylinder pumping system, double-cylinder pumping system and pumping equipment Download PDF

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Publication number
CN102840123A
CN102840123A CN2012103491951A CN201210349195A CN102840123A CN 102840123 A CN102840123 A CN 102840123A CN 2012103491951 A CN2012103491951 A CN 2012103491951A CN 201210349195 A CN201210349195 A CN 201210349195A CN 102840123 A CN102840123 A CN 102840123A
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China
Prior art keywords
twin
valve
tub
oil
tub pumping
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CN2012103491951A
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CN102840123B (en
Inventor
李沛林
曹奎
王佳茜
高荣芝
李华
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Zoomlion Heavy Industry Science and Technology Co Ltd
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Zoomlion Heavy Industry Science and Technology Co Ltd
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Priority to CN201210349195.1A priority Critical patent/CN102840123B/en
Priority to PCT/CN2012/086135 priority patent/WO2014044000A1/en
Publication of CN102840123A publication Critical patent/CN102840123A/en
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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
    • 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
    • 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
    • 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

Anti-channeling shutdown method for a two-cylinder pumping system, the two-cylinder pumping system comprising a two-cylinder pumping device having two master cylinders (4, 5) and a hydraulic control system for the two-cylinder pumping device, the shutdown method comprising: firstly, controlling the double-cylinder pumping device to stop pumping operation; secondly, at least one chamber of the rod chamber and the rodless chamber of the two master cylinders (4, 5) is communicated with an oil tank or an oil return path. In addition, the invention also provides a double-cylinder pumping system and pumping equipment. The invention originally adds the pressure relief step on the basis of the existing double-cylinder pumping system, thereby being capable of enabling each cavity of the main oil cylinder of the double-cylinder pumping system to be in a low-pressure or non-pressure state, effectively preventing the piston rod of the main oil cylinder from accidentally moving due to closed high-pressure oil, and relatively effectively ensuring the safety of maintenance personnel in the process of overhauling and maintaining the double-cylinder pumping system.

Description

The twin-tub pumping system is prevented play closing method, twin-tub pumping system and pumping equipment
Technical field
The present invention relates to a kind of twin-tub pumping system control method, particularly, relate to the anti-play closing method of a kind of twin-tub pumping system.Further, the present invention relates to a kind of twin-tub pumping system that can realize said anti-play closing method.In addition, the invention still further relates to a kind of pumping equipment that comprises said twin-tub pumping system.
Background technique
Sticky material such as concrete, mud is an engineering construction field structural material commonly used, and these sticky materials typically carry out pumping through the twin-tub pumping system, and said 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 send device with reference to widely used Concrete Double cylinder pump in the engineering construction; This twin-tub pumping installations passes through the control of its hydraulic control system, thereby utilizes pressure that sticky material is carried along pipeline continuously.Particularly; Said twin-tub pumping system generally can drive oil hydraulic pump by motor (or internal-combustion engine) and form the hydraulic oil with certain pressure; Drive master cylinder and drive two piston generation alternate reciprocating motion of carrying in the cylinder; Make sticky material constantly suck and carry cylinder, and be transported to the job site through conveyance conduit from hopper.
In order to help to understand, below seeing figures.1.and.2 and sending device and hydraulic control system thereof with the Concrete Double cylinder pump is the make brief of the introduction main structure and the shortcoming thereof of said twin-tub pumping system of example.
Particularly, referring to Fig. 1, the Concrete Double cylinder pump send device to generally comprise two master cylinders 4; 5 (being also referred to as " master hydraulic cylinder "), two are carried 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 show among Fig. 1 such as oscillating oil cylinder, hopper, distributing valve; It belongs to well-known components; Hereinafter repeats no more, and these parts are assembled together, and constitutes the Concrete Double cylinder pump and send device.With regard to the hydraulic control system that this Concrete Double cylinder pump send device, mainly be meant to be connected to corresponding hydraulic control circuit on master cylinder and the oscillating oil cylinder.
As shown in Figure 1, the rod chamber A of above-mentioned two master cylinders 4,5, C are interconnected; Rodless cavity B, D are connected to main reversing valve 3; This main reversing valve 3 is connected in oil-feed oil circuit and fuel tank, optionally makes the rodless cavity D of first master cylinder 4 in two master cylinders be communicated with the oil-feed oil circuit through the switching-over of main reversing valve 3, and the rodless cavity B of second master cylinder 5 is communicated with fuel tank; The rodless cavity D of the master cylinder 4 of winning is communicated with fuel tank, and the rodless cavity B of second master cylinder 5 is communicated with the oil-feed oil circuit.Because the rod chamber A of two master cylinders 4,5, C is interconnected and is closed with hydraulic oil; Hydraulic oil in the rod chamber A of these two master cylinders 4,5, C plays the effect of driving medium; Through alternately to two master cylinders 4; 5 rodless cavity B, thus the D oil-feed can realize the alternately flexible of two master cylinders 4,5.Two pumping pistons 12,13 lay respectively at said two and carry in the cylinders and connect driving corresponding pumping piston 12,13 alternating motions with the piston rod of master cylinder 4,5 respectively, with alternately pumping or suction sticky material, for example concrete.
In addition, some that have shown existing concrete twin-tub pumping installations among Fig. 1 are detailed structure more specifically, particularly, is separately installed with the Sealing 14,15 that the inner peripheral surface sealing that is used for carrying accordingly cylinder is slidingly matched on the outer circumferential face of pumping piston 12,13.Water tank 16 is installed, these two master cylinders 4 between two master cylinders 4,5 and two conveying cylinders; 5 piston rod passes water tank 16 and is connected in corresponding pumping piston 12,13, two pumping pistons 12 in the pumpdown process; 13 alternately stretch corresponding the conveying in the cylinder, and wherein water tank 16 is mainly used in cooling, because pumping piston 12; 13 with corresponding friction of carrying cylinder not stop, can play cooling action to pumping piston 12,13 through cooling water or the cooling liquids in the water tank 16 like this.Above-mentioned Concrete Double cylinder pump send the main reversing valve 3 in the hydraulic control system of device to be connected in the oil-feed oil circuit; Know to those skilled in the art; The oil-feed oil circuit generally comprises the oil hydraulic pump 1 that drives through power plant (motor or motor etc.); Wherein the inlet opening of oil hydraulic pump 1 is communicated with fuel tank; Delivery outlet is connected in the oil inlet P of main reversing valve 3, generally also is connected with the overflow oil circuit that comprises relief valve 2 on the oil circuit between the oil inlet P of the delivery outlet of oil hydraulic pump 1 and main reversing valve 3, to carry out overvoltage protection.
Further; Two master cylinders 4; 5 also are connected with buffering respectively is communicated with oil circuit, and promptly the zone near two ends of the cylinder barrel of each master cylinder 4,5 is connected with the buffering oil circuit respectively; Be the rodless cavity buffering oil circuit that is provided with first stop valve 6 (typically being ball valve) and one-way valve 8 in the left end zone of first master cylinder 4 among Fig. 1, the rod chamber buffering oil circuit that is provided with one-way valve 10 in right-hand member zone; The rodless cavity buffering oil circuit that is provided with second stop valve 7 (typically being ball valve) and one-way valve 9 in the left end zone of second master cylinder 5, the rod chamber buffering oil circuit that is provided with one-way valve 11 in right-hand member zone.The sort buffer oil circuit send at the Concrete Double cylinder pump of existing technology and often adopts on the device, and its piston rod that is mainly used in master cylinder cushions in the fore and aft motion process, prevent that the piston of master cylinder from acutely clashing into the cylinder barrel of master cylinder at the terminal point of flexible stroke.For example; With regard to the operating process of buffering oil circuit on first master cylinder 4; When the rod chamber C of first master cylinder 4 oil-feed, rodless cavity D oil return, the piston rod of first master cylinder 4 moves towards the left side, when running to the left end zone near cylinder bottom; This moment, the two ends of rodless cavity buffering oil circuit were communicated with the rodless cavity D and the rod chamber C of first master cylinder 4 respectively; If the oil pressure of rod chamber C movement velocity too high and piston rod is too fast, can open first stop valve 6, make the interior part hydraulic oil of rod chamber C of the master cylinder 4 of winning flow to rodless cavity D via the one-way valve 8 and first stop valve 6; Thereby make the oil pressure in the rodless cavity D increase to a certain extent; Increase the resistance to motion of the piston rod of first master cylinder 4, thereby make the piston rod of the master cylinder 4 of winning to move to the terminal point of withdrawal stroke relatively lenitively, avoid too violent bump cylinder bottom.Similarly; With regard to the regional rod chamber of the right-hand member of first master cylinder 4 cushions oil circuit; Because the piston rod of first master cylinder 4 is used for the outwards powerful concrete that pushes in the process of stretching out; Therefore oil pressure is bigger, thus only be provided with one-way valve 10 on the right-hand member rod chamber buffering oil circuit, in case when the piston motion on the piston rod of first master cylinder 4 is communicated with rod chamber C and rodless cavity D to the two ends of rod chamber buffering oil circuit; Rod chamber buffering oil circuit is promptly brought into play the effect same with the aforesaid operations process, repeats no more at this.In addition, generally also be provided with throttle valve on above-mentioned each buffering oil circuit, it mainly is the restriction buffer traffic, avoids the hydraulic fluid flow rate between rodless cavity D and the rod chamber C excessive.
Above to send system with reference to Fig. 1 with the Concrete Double cylinder pump be the main structure that example has been described the twin-tub pumping system, it should be noted that two master cylinders 4 at this; 5 are not limited to the rod chamber A of two master cylinders 4,5 shown in Fig. 1, and C is interconnected to constitute the situation of communicated cavity; Selectively, also can adopt the rodless cavity B of two master cylinders 4,5; D is interconnected and constitutes the structural type of communicated cavity; The rod chamber A of two master cylinders 4,5 under this situation, C constitutes actuator chamber respectively and is connected with selector valve.In the actual twin-tub pumping installations; Two master cylinders 4; 5 rodless cavity B, D or rod chamber A, C can be through switching optionally as communicated cavity; This generally realizes six high low pressure switching valves that two-way plug-in valve constituted of employing for example shown in Figure 2 through twin-tub pumping system (for example the Concrete Double cylinder pump send system) high low pressure switching valve commonly used.Need to prove that at this high low pressure switching valve that adopts 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 in the twin-tub pumping system of above-mentioned existing technology when having Maintenance and Repair, and security incident takes place easily.
Particularly, referring to shown in Figure 1, the sticky material of pumping for preventing (for example concrete) flows backwards; When main reversing valve 3 is in meta; The actuator port A of main reversing valve 3, B are (being that the main reversing valve 3 that adopts among Fig. 2 is M type three position four-way directional control valve) of ending, therefore, and when stopping pumping; Hydraulic oil in the rod chamber A of the rod chamber C of first master cylinder 4 and rodless cavity D and second master cylinder 5 and the rodless cavity B seals, and often has the high pressure oil sealing in above-mentioned rod chamber and rodless cavity.Even shut down sometimes; High pressure oil can not release very soon yet; This can bring certain potential safety hazard; Safeguarding and during maintenance that particularly this rod chamber and the interior high-pressure and hydraulic oil of rodless cavity of being enclosed in may make the piston rod play forward of master cylinder, critical repair and maintenance personnel's handling safety in the Maintenance and Repair operating process.
In having the twin-tub pumping system of high low pressure switching valve, this safety problem of bringing because of high pressure oil sealing is even more serious.For example, referring to shown in Figure 2, wherein the hydraulic control system of twin-tub pumping installations adopts the high low pressure switching valve that is made up of six two-way plug-in valve 17-22; Wherein the hydraulic control hydraulic fluid port of three two-way plug-in valves 17,18,19 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; 21,22 hydraulic control hydraulic fluid port is communicated with the second actuator port B1 of two-position four-way solenoid directional control valve 23, and the return opening of solenoid directional control valve 23 is connected in oil cylinder; Filler opening passes through oil circuit respectively via one-way valve 24; 25 are connected to the pumping oil circuit and distribute on the oil circuit, thereby can or distribute oil circuit to introduce the hydraulic control oil of the higher relatively hydraulic oil of oil pressure as above-mentioned two-way plug-in valve from the pumping oil circuit, to realize the high low pressure conversion of twin-tub pumping installations (for example the Concrete Double cylinder pump send device).Make when the electromagnet DT1 dead electricity of solenoid directional control valve 23 when solenoid directional control valve 23 is in position, a left side; The liquid controling cavity of two-way plug-in valve 20,21,22 pins through hydraulic control oil; The liquid controling cavity of two-way plug-in valve 17,18,19 is communicated with fuel tank; The effect of the hydraulic oil of these three two-way plug-in valves 17,18,19 on the working oil path of two master cylinders 4,5 is opened down, and wherein master cylinder 4; 5 rodless cavity is communicated with through the two logical valves 18 that insert; When main reversing valve 3 was in position, a left side, the hydraulic oil of the first actuator port A of main reversing valve 3 was via the rod chamber A of two-way plug-in valve 19 input master cylinders 5, and 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 thus the twin-tub pumping system low pressure pumping state (this moment since the rod chamber of master cylinder 4,5 in telescopic process alternately as actuator chamber, the hydraulic oil effective active area of main oil cylinder piston is less relatively in the rod chamber; The pumping force that same oil pressure produces is less relatively, promptly so-called low pressure pumping state).When electromagnet DT1 gets electricly, when solenoid directional control valve 23 was in right position, the liquid controling cavity of two-way plug-in valve 17,18,19 was through the pinning of hydraulic control oil; The liquid controling cavity of two-way plug-in valve 20,21,22 is communicated with fuel tank, the rodless cavity D of master cylinder 4,5; B is communicated with actuator port A, the B of main reversing valve through two-way plug-in valve 20,22 respectively; Rod chamber A, C communicates with each other through two-way plug-in valve 21, and at this moment the twin-tub pumping system is in high pressure pumping state.
As previously mentioned, when stopping pumping, possibly have High-pressure oil sealing in the rod chamber A of the rod chamber C of first master cylinder 4 and rodless cavity D and second master cylinder 5 and the rodless cavity B and close, particularly change pumping piston 12 interior; 13 Sealing 14,15 o'clock need be closed stop valve 6,7 earlier, drives master cylinder 4 again; 5, make pumping piston 12,13 alternately return to water tank 16 respectively; Because at this moment the piston of master cylinder 4,5 falls back on limit position, system pressure can sharply rise; At this moment stop to drive, the hydraulic oil sealing that has higher oil pressure is in some chamber of master cylinder 4,5.At this moment, if shut down, because pumping oil circuit and distribute the equal off-load of oil circuit, the liquid controling cavity on six cartridge valves does not all have pilot pressure; Under the effect of master cylinder internal pressure oil, cartridge valve can be opened, and causes master cylinder 4; 5 rod chamber, rodless cavity all are communicated with, because flowing of fluid usually can cause master cylinder 4; 5 piston rod is play forward, be embodied in shutdown after, pumping piston 12; 13 can be forward play one segment distance, and flowing of this hydraulic oil usually can not eliminate oil pressure reliably, when the maintainer keeps in repair, still possibly have potential safety hazard.In addition, if the play distance is excessive, possibly causes pumping piston to get into the conveying cylinder again, thereby can't change piston seal.
For addressing this problem the following scheme of normal employing in the existing technology: referring to shown in Figure 2, during shutdown; Make not dead electricity of hydraulic control system, distribute the not automatic deloading of accumulator of oil circuit, therefore; The liquid controling cavity of three cartridge valves in the cartridge valve has pressure all the time, and system's high low pressure state remains unchanged, therefore; Can not cause the rod chamber of master cylinder 4,5 and being communicated with of rodless cavity.At this moment, drive master cylinder again, make each chamber off-load of oil cylinder, the accumulator drain charge that manually will distribute oil circuit again.
But existing technology is had relatively high expectations to the operator, when operating procedure is wrong, is prone to cause security incident.Distribute the not automatic deloading of oil circuit accumulator, have certain potential safety hazard equally, also do not meet the concerned countries standard-required.In addition, if, might cause potential safety hazards such as actuator's misoperation in maintenance, when maintenance hydraulic system dead electricity not.
Because the above-mentioned defective of existing technology need 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 provides the anti-play closing method of a kind of twin-tub pumping system, and the anti-play closing method of this twin-tub pumping system can be avoided piston rod play after shutdown of master cylinder effectively, thereby guarantees the safety of repair and maintenance work.
Further, technical problem to be solved by this invention provides a kind of twin-tub pumping system, and this twin-tub pumping system can be realized the anti-play function of piston rod after shutdown of master cylinder relatively effectively, thereby guarantees the safety of repair and maintenance work.
In addition, technical problem to be solved by this invention provides a kind of pumping equipment, and the twin-tub pumping system of this pumping equipment can be realized the anti-play function of piston rod after shutdown of master cylinder relatively effectively, thereby guarantees the safety of repair and maintenance work.
In order to solve the problems of the technologies described above; The present invention provides a kind of twin-tub pumping system to prevent the play closing method; Said twin-tub pumping system comprises the twin-tub pumping installations with two master cylinders and the hydraulic control system of this twin-tub pumping installations; Said closing method comprises the steps: the first, controls said twin-tub pumping installations and stops pumpdown, thereby make rod chamber and rodless cavity and the oil-feed oil circuit of said two master cylinders and oil return circuit all be in cut-off state; The second, make the rod chamber of said two master cylinders and at least one chamber in the rodless cavity be communicated with fuel tank or oil return circuit.
Preferably, in said second step, make the rod chamber of said two master cylinders and at least one chamber in the rodless cavity be communicated with the scheduled time with fuel tank or oil return circuit.
Specifically selectively, said scheduled time is 1-5 second.
Preferably, in said first step, control said twin-tub pumping installations and switch under low pressure pumping state and stop pumpdown.
Preferably, in said first step, under the situation in a pumping piston of said twin-tub pumping installations stops at the water tank of this twin-tub pumping installations, control said twin-tub pumping installations and stop pumpdown.
More preferably, in said first step, stop under the situation in the said water tank, control said twin-tub pumping installations and stop pumpdown at a pumping piston that detects said twin-tub pumping installations.
Typically, said twin-tub pumping system send system for the Concrete Double cylinder pump, and said twin-tub pumping installations send device for the Concrete Double cylinder pump.
Preferably, in said second step, make the whole rod chambers and the rodless cavity of master cylinder of said twin-tub pumping installations be communicated with fuel tank or oil return circuit.
On the basis of the technological scheme of above-mentioned closing method; The present invention provides a kind of twin-tub pumping system, comprises twin-tub pumping installations and hydraulic control system thereof, and said twin-tub pumping installations comprises two master cylinders; Wherein, Said hydraulic control system also comprises the release oil circuit, and an end of this release oil circuit is connected in fuel tank or oil return circuit, and the other end is connected in the rod chamber of said two master cylinders and at least one chamber in the rodless cavity via corresponding oil circuit; Said release oil circuit is provided with switch valve, can control the rod chamber of said master cylinder when the said twin-tub pumping system-down and at least one chamber in the rodless cavity is communicated with fuel tank or oil return circuit.
Typically; Said hydraulic control system comprises main reversing valve and high low pressure switching valve, and each interface of this high low pressure switching valve is connected to said two master cylinders rod chamber separately and first actuator port and second actuator port of rodless cavity and said main reversing valve.
Specifically selectively; Said 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 in the pumping oil circuit; Return opening is connected in fuel tank, and first actuator port is connected said two master cylinders via said high low pressure switching valve respectively with second actuator port.
Typically; Said high low pressure switching valve comprises 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 the hydraulic control oil circuit, and said hydraulic control oil circuit comprises two-position four way change valve, and the filler opening of this two-position four way change valve is connected in the pumping oil circuit and distribution oil circuit of said hydraulic control system respectively via an one-way valve; Return opening is connected in fuel tank; First actuator port is connected in the hydraulic control mouth of said the 4th to the 6th two-way plug-in valve, and second actuator port is connected in the hydraulic control mouth of said first to the 3rd two-way plug-in valve, and wherein two said one-way valves reverse port separately is communicated with the filler opening of said two-position four way change valve.
Preferably, the other end of said release oil circuit is connected on any oil circuit in the oil circuit between said high low pressure switching valve and said two master cylinders.
As another kind of preferred form; The other end of said release oil circuit is connected to the reverse port of first one-way valve and second one-way valve; The forward port of said first one-way valve is connected in second actuator port of said main reversing valve, and the forward port of said second one-way valve is connected in first actuator port of said main reversing valve.
Preferably, the switch valve on the said release oil circuit is the electrically switchable grating valve.
Specifically selectively, said 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, be provided with the position detecting device whether pumping piston that is used to detect this twin-tub pumping installations is positioned at said water tank in the water tank of said twin-tub pumping installations.
In addition, the present invention also provides a kind of pumping equipment, and wherein, this pumping equipment comprises the described twin-tub pumping system of above-mentioned arbitrary technological scheme.
Pass through technique scheme; Anti-play closing method of twin-tub pumping system of the present invention and the twin-tub pumping system that can realize this closing method; It increases a release step originally on the basis of existing twin-tub pumping system-down method; Thereby can make each chamber of master cylinder of twin-tub pumping system be in low pressure or passive state; The piston rod that has prevented master cylinder effectively is because high pressure oil and the play that meets accident of sealing, guaranteed maintainer's in the repair and maintenance working procedure of twin-tub pumping system safety relatively effectively.The anti-play closing method of twin-tub pumping system of the present invention has applicability at large; Especially can be applicable in the twin-tub pumping system with high low pressure switching valve effectively; The play of main oil cylinder piston bar when it prevents twin-tub pumping system-down relatively reliably; Make and make that the twin-tub pumping system is safer by twin-tub pumping system each cavity pressure of removal master cylinder effectively when shutting down.Pumping equipment of the present invention comprises said twin-tub pumping system, so it has above-mentioned advantage equally.
Other features and advantages of the present invention will partly specify in embodiment subsequently.
Description of drawings
Attached drawings is used to provide further understanding of the present invention, and constitutes the part of specification, and it is used to explain the present invention with following embodiment, but protection scope of the present invention is not limited to following accompanying drawing and embodiment.In the accompanying drawings:
Fig. 1 is the schematic diagram of the twin-tub pumping system of existing technology, has wherein shown the 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 the existing technology, has additional the high low pressure switching valve in the wherein said hydraulic control system.
Fig. 3 is the structure principle chart of the twin-tub pumping system of first kind of embodiment of the present invention.
Fig. 4 is the structure principle chart of the twin-tub pumping system of second kind of 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 4th kind of embodiment of the present invention.
Fig. 7 is the step block diagram of the anti-play closing method of twin-tub pumping system 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 switching valves;
33 release oil circuits.
Embodiment
Be elaborated below in conjunction with the accompanying drawing specific embodiments of the invention, should be understood that, embodiment described herein only is used for explanation and explains the present invention, and protection scope of the present invention is not limited to following embodiment.
In order to make the description of embodiment clear and definite more specifically it will be appreciated by those skilled in the art that conveniently following mainly to send system with the Concrete Double cylinder pump be that example is described embodiment of the present invention.Correspondingly; The anti-play closing method of twin-tub pumping system of the present invention in the following description can be called " the Concrete Double cylinder pump send system to prevent the play closing method "; The twin-tub pumping system can be called " the Concrete Double cylinder pump send system " etc.; But to those skilled in the art apparently; Because twin-tub pumping installations of the present invention and the main structure of hydraulic control system and the similar that the Concrete Double cylinder pump send device and hydraulic control system thereof, following embodiment can be applicable to generality the shutdown control of fluid foods twin-tub pumping system, the for example control of twin-tub such as mud, mortar pumping system.
Relevant Concrete Double cylinder pump send the structural type of device and hydraulic control system itself thereof to know to those skilled in the art; Make brief of the introduction hereinbefore; Therefore hereinafter in the description of technological scheme of the present invention, the introduction of omitting known configurations is stressed key technology design of the present invention.In addition, omitted some other well-known components that the Concrete Double cylinder pump send device among Fig. 4 to Fig. 6, for example distributing valve, oscillating oil cylinder, hopper etc., but do not influence the understanding of those skilled in the art to technological scheme of the present invention.About the differentiation of " first " and " second " etc., be merely and describe convenient and use, it does not constitute the restriction to protection domain of the present invention.
The embodiment of the anti-play closing method of twin-tub pumping system of the present invention is below at first described; And then the embodiment of twin-tub pumping system of the present invention described; In the description process, with subsidiary relevant operating process, the typical hydraulic device that is adopted and the variant that some are possible described.
Referring to shown in Figure 7; The anti-play closing method of twin-tub pumping system of the present invention is applicable to the twin-tub pumping system; Said twin-tub pumping system comprises having two master cylinders 4; 5 the twin-tub pumping installations and the hydraulic control system of this twin-tub pumping installations, the anti-play closing method of said twin-tub pumping system comprises: first step, the twin-tub pumping installations of controlling said twin-tub pumping system stops pumpdown; Thereby the rod chamber of said two master cylinders 4,5 and rodless cavity and oil-feed oil circuit and oil return circuit all are in cut-off state when stopping pumpdown; Second step makes the rod chamber of said two master cylinders 4,5 and at least one chamber in the rodless cavity be communicated with fuel tank or oil return circuit.
Preferably; In this second step; Can be so that said two master cylinders 4; 5 rod chamber and at least one chamber in the rodless cavity are communicated with the scheduled time (for example 1-5 second) with fuel tank or oil return circuit, this can prevent the material in the material conveying pipe effectively, for example concrete flow backwards (seeing the description of hereinafter twin-tub pumping system for details).In addition, directly be connected with fuel tank although Fig. 3 to Fig. 6 all shows release oil circuit 33, to those skilled in the art apparently, release oil circuit 33 links to each other with the oil return circuit of fuel tank or hydraulic control system, all can play the purpose of release.
No matter it will be appreciated that at this, be the high pressure pumping state or the low pressure pumping state of twin-tub pumping installations, when stopping pumpdown why at two master cylinders 4; Can be closed with low pressure oil or high pressure oil in 5 rod chamber and the rodless cavity, concrete reason is following: for example, and referring to shown in Figure 3; If this moment, the twin-tub pumping installations was in low pressure pumping state, suppose the rod chamber C oil-feed of first master cylinder 4 this moment, the rod chamber A oil return of second master cylinder 5; The rodless cavity B of first master cylinder 4 and second master cylinder 5, D stop pumpdown as communicated cavity when the piston rod of first master cylinder 5 has moved to the left end precalculated position in Fig. 3; Main reversing valve 3 switches to meta fast, and the rod chamber C oil-feed of first master cylinder 4 stops, and the rod chamber A oil return of second master cylinder 5 ends equally; But the piston rod of first and second master cylinders 4,5 has motional inertia, and it keeps proal inertia; Thereby the hydraulic oil pressurized of the rod chamber A of second master cylinder 5 stops the motion of the piston rod of first and second master cylinders 4,5, first and second master cylinders 4; 5 piston rod moment stops; The rodless cavity B of rod chamber C, first master cylinder 4 and second master cylinder 5 through first master cylinder 4, the hydraulic oil of the corresponding oil pressure of the communicated cavity that D forms and the rod chamber C inner sealing of first master cylinder 4 forms equilibrium of forces to the effect of the piston rod of first and second master cylinders 4,5; Two master cylinder 4,5 reality have formed a fluid pressure linkage structure.Under this situation, although the hydraulic oil of each rod chamber of two master cylinders 4,5 and rodless cavity inner sealing all has oil pressure, as long as to any one chamber release, then other chamber is because equilibrium of forces also can release.Therefore, only need when stopping pumpdown, to make and the rod chamber of two master cylinders 4,5 and any the chamber release in the rodless cavity can realize the object of the invention.
Particularly, for example referring to shown in Figure 3, if this moment, the twin-tub pumping installations was in low pressure pumping state; Suppose the rod chamber C oil-feed of first master cylinder 4 this moment, the rod chamber A oil return of second master cylinder 5, the rodless cavity B of first master cylinder 4 and second master cylinder 5; D is as communicated cavity; When stopping pumpdown, hopper is feed no longer, because oil pressure depends on load; Hydraulic oil in the rod chamber C of first master cylinder 4 need drive two piston rods of first master cylinder 4 and second master cylinder 5, so oil pressure is the highest; Communicated cavity (the i.e. rodless cavity B of first master cylinder 4 and second master cylinder 5; D) hydraulic oil in only need drive the piston rod of second master cylinder 5; Hydraulic oil in the rodless cavity is bigger to the effective active area of piston rod simultaneously; Therefore the oil pressure in the communicated cavity is in lower state, but has certain oil pressure (can be called medium oil pressure); The rod chamber A of second master cylinder 5 is communicated with fuel tank via main reversing valve 3; Oil pressure minimum (being approximately zero); If under the situation in the piston rod movement of first master cylinder 4 left end precalculated position shown in Figure 3, make the twin-tub pumping installations shut down; As stated; The rod chamber A of second master cylinder 5 stops oil return, thereby the piston rod of second master cylinder 5 is because motional inertia makes the interior hydraulic oil pressurized of rod chamber A of second master cylinder 5 form oil pressure, i.e. oil pressure moment increase in the rod chamber A of second master cylinder 5; The oil pressure of the rod chamber A of the rod chamber C of first master cylinder 4, said communicated cavity and second master cylinder 5 applies active force to the piston portion of the piston rod of first master cylinder 4 and second master cylinder 5, the piston rod of the win master cylinder 4 and second master cylinder 5 is under the equilibrium of forces state and stops.Under this situation, for the oil pressure that prevents to be enclosed in the hydraulic oil in the master cylinder 4,5 in the repair and maintenance process because accidental cause and disequilibrium causes the piston rod play need shed the oil pressure in the master cylinder 4,5.Under high pressure pumping state, similar during corresponding oil pressure state of changing, repeat no more at this.
In order to ensure preventing the piston rod play, when release, generally can be so that two master cylinders 4; Oil pressure in arbitrary chamber in 5 rod chamber and the rodless cavity is laid down; Because the 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 the nature removal.Therefore; In above-mentioned technical conceive scope of the present invention, so long as the operating mode when stopping the stock operation, make master cylinder 4 according to the double pump pumping installations; The oil pressure of the hydraulic oil of 5 rod chamber and any in the rodless cavity or whole chamber inner sealings is laid down, and it all belongs to protection scope of the present invention.Most preferably; Can be so that twin cylinder pump send the master cylinder 4 of device; 5 whole rod chambers and rodless cavity are communicated with fuel tank or oil return circuit; This can prevent play the most reliably, prevents to make because of accidental cause the oil pressure removal not of rod chamber or some chamber in the rodless cavity of two master cylinders 4,5.
In the technical conceive scope of above-mentioned anti-play closing method of the present invention, when control twin-tub pumping installations stops pumping, can make the twin-tub pumping installations under low pressure pumping state, shut down through control (for example through high low pressure switching valve 32).As stated; The subject matter that exists owing to existing technology piston rod of first master cylinder 4 or second master cylinder 5 when shutting down possibly cause changing the Sealing 14 of first and second pumping pistons 12,13 because play take place high oil pressure;, there is potential safety hazard at 15 o'clock.Change mixed Sealing 14,15 o'clock, needing to drive first and second master cylinders 4,5 (generally taking the crawl mode of operation), making corresponding pumping piston return to water tank 16.When crawl first and second master cylinders 4 under high pressure pumping state; 5 o'clock, after master cylinder 4,5 puts in place; There is higher relatively oil pressure (for example can be the rod chamber C of rod chamber A, rodless cavity B and first master cylinder of second master cylinder 5 among Fig. 3) in three chambeies of master cylinder 4,5.When crawl master cylinder under low-pressure state, have only a chamber to have high pressure (, for example can be the rod chamber C of first master cylinder shown in Figure 3) in the rod chamber of master cylinder 4,5 and the rodless cavity with reference to the preceding text analysis.Therefore, when high pressure conditions was shut down down, pump oil cylinder piston rod play possibility was bigger, and when low-pressure state was shut down down, piston rod play possibility was less.Therefore; Be in technical conceive scope of the present invention, to control said twin-tub pumping installations and switch to the technological scheme that under low pressure pumping state, stops pumpdown what this need specify; It both can be used as a kind of preferred control mode, also can constitute a kind of independently control mode.Under its situation as a kind of independent control mode; As stated; It can reduce the possibility of the piston rod play of first master cylinder 4 or second master cylinder 5 effectively, even it has no follow-up release step like this, also can solve safety problem relatively effectively.Under its situation as a kind of preferred control mode; At follow-up unloading oil pressure when preventing the piston rod play of first master cylinder 4 or second master cylinder 5; Because following two master cylinders 4 of low pressure pumping state; 5 whole oil pressure is relatively low, therefore unload press operation and be more prone to, and the Security after the release is more reliable.
For the ease of carrying out pumping piston 12; The replacing of 13 Sealing 14,15, preferably; In above-mentioned first step; Stop at a pumping piston 12,13 of said twin-tub pumping installations under the situation in the water tank 16 of this twin-tub pumping installations, the twin-tub pumping installations of controlling said twin-tub pumping system stops pumpdown.To those skilled in the art apparently, because therefore first pumping piston 12 and 13 alternating motions of second pumping piston only can make that once a pumping piston 12 or 13 stops in the water tank 16.Further preferably; On the basis of technique scheme; Can increase the relevant detection step; Promptly stop under the situation in the water tank 16 of this twin-tub pumping installations at a pumping piston 12,13 that detects said twin-tub pumping installations, the twin-tub pumping installations of controlling said twin-tub pumping system stops pumpdown.
In addition, in the above-mentioned technical conceive scope of twin-tub pumping system-down method of the present invention, preferably, make the rod chamber of said two master cylinders 4,5 and at least one chamber in the rodless cavity be communicated with the 1-5 time of second with fuel tank or oil return circuit.
More than describe the embodiment of the anti-play closing method of twin-tub pumping system of the present invention, below described the embodiment of the twin-tub pumping system that is used to realize 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, so hereinafter repeats no more for known structure or element, and only describe the structure that embodies technical conceive of the present invention.
Referring to Fig. 3 to Fig. 6, twin-tub pumping system of the present invention comprises twin-tub pumping installations and hydraulic control system thereof, and said twin-tub pumping installations comprises two master cylinders 4; 5, wherein, said hydraulic control system also comprises release oil circuit 33; One end of this release oil circuit 33 is connected in fuel tank or oil return circuit; The other end is connected in the rod chamber of said two master cylinders 4,5 and at least one chamber in the rodless cavity via corresponding oil circuit, and said release oil circuit 33 is provided with switch valve; Can control the rod chamber of said master cylinder 4,5 when the said twin-tub pumping system-down and at least one chamber in the rodless cavity is communicated with fuel tank or oil return circuit.
It will be appreciated that in technical conceive scope 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 referring to shown in Figure 3, the release oil circuit 33 that can be connected with switch valve respectively at two master cylinders 4,5 rod chamber and rodless cavity separately; Like this when carrying out release, can make corresponding release oil circuit 33 conductings as required and carry out release.As long as these variant have adopted above-mentioned technical conceive of the present invention, it all belongs to protection scope of the present invention.
Each preferred implementation of twin-tub pumping system of the present invention is below specifically described with reference to Fig. 3 and Fig. 6.
Referring to Fig. 3 to shown in Figure 6, with the twin-tub pumping system class of routine seemingly, said twin-tub pumping system comprises the hydraulic control system of twin-tub pumping installations and this twin-tub pumping installations.The main structure of relevant twin-tub pumping installations is described in above-mentioned, repeats no more at this.Said hydraulic control system generally comprises main reversing valve 3; Known ground; These main reversing valve 3 general three position four-way directional control valves, the oil inlet P of this main reversing valve 3 is connected in pumping oil circuit (being the oil-feed oil circuit), and oil return inlet T is connected in fuel tank; The first actuator port A is connected two master cylinders 4,5 via corresponding oil circuit respectively with the second actuator port B.Know to those skilled in the art; The oil-feed oil circuit generally comprises the oil hydraulic pump 1 that drives through power plant (motor or motor etc.); Wherein the inlet opening of oil hydraulic pump 1 is communicated with fuel tank; Delivery outlet is connected in the oil inlet P of main reversing valve 3, generally also is connected with the overflow oil circuit that comprises relief valve 2 on the oil circuit between the oil inlet P of the delivery outlet of oil hydraulic pump 1 and main reversing valve 3, to carry out overvoltage protection.As stated, flow backwards in order to prevent twin-tub pumping installations material in the pumpdown process, main reversing valve 3 need have meta by function, so main reversing valve 3 general M type three position four-way directional control valve or the O type three position four-way directional control valves of adopting.
Fig. 3 includes high low pressure switching valve 32 to the hydraulic control system of twin-tub pumping installations shown in Figure 6, and promptly the first actuator port A of main reversing valve 3 and the second actuator port B are connected on two master cylinders 4,5 via high low pressure switching valve 32.Generally speaking, the high low pressure switching valve that can adopt in the twin-tub pumping system can have various ways, and it is mainly used in the high low pressure of realizing the twin-tub pumping installations and switches.The high low pressure switching valve can form the form of combination valve; Also can there be the valve of dispersion to connect through oil circuit; Each interface on the high low pressure switching valve is connected in two master cylinders 4,5 rod chamber and the interface of rodless cavity and the first actuator port A and second actuator port B of main reversing valve 3 separately via corresponding oil circuit respectively.For example; In Fig. 3 to Fig. 6; High low pressure switching valve 32 is made up of six two-way plug-in valves; I.e. 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, repeats no more at this.Wherein first port of first two-way plug-in valve 17 is communicated with the second actuator port B of main reversing valve 3, and second port is communicated with the rod chamber C of first master cylinder 4; First port of second two-way plug-in valve 18 is communicated with the rodless cavity B of second master cylinder 5, and second port is communicated with the rodless cavity D of 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 second port is communicated with the rod chamber A of 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 second port is communicated with the rodless cavity B of second master cylinder 5; First port of the 5th two-way plug-in valve 21 is communicated with the rod chamber C of first master cylinder 4, and second port is communicated with the rod chamber A of second master cylinder 5; 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 second interface is communicated with the rodless cavity D of first master cylinder 4.In addition, the hydraulic control mouth of above-mentioned six two-way plug-in valves is connected to the hydraulic control oil circuit, particularly; For example in Fig. 3, the hydraulic control oil circuit comprises two-position four way change valve (two-position four-way solenoid directional control valve 23 for example shown in Figure 3), first to the 3rd two-way plug-in valve 17 in above-mentioned six two-way plug-in valves; 18,19 hydraulic control mouth is connected in the second actuator port B1 of two-position four-way solenoid directional control valve 23, the 4th to the 6th two-way plug-in valve 20; 21,22 hydraulic control mouth is connected in the first actuator port A1 of two-position four-way solenoid directional control valve 23, and 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 in the pumping oil circuit and distribute oil circuit, and oil return inlet T 1 is connected in fuel tank, and wherein one-way valve 24; 25 reverse port separately is communicated with the oil inlet P 1 of two-position four-way solenoid directional control valve, pumping oil circuit or distribute the bigger hydraulic oil of oil pressure on the oil circuit to be incorporated into the oil inlet P 1 of two-position four-way solenoid directional control valve like this, and optionally control first to the 3rd two-way plug-in valve 17 through two-position four-way solenoid directional control valve 23; 18; The the 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 only is the concrete form of describing for example, and it can adopt the selector valve of various ways, wins to the 3rd two-way plug-in valve 17 as long as can make; 18; The hydraulic control mouth of 19 hydraulic control mouth and the 4th to the 6th two-way plug-in valve 20,21,22 optionally is communicated with the hydraulic control oil sources and gets final product.
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 adopts on the release oil circuit 33 is a bi-bit bi-pass solenoid directional control valve 26 open in usual; One termination fuel tank of release oil circuit 33; The other end can be connected on high low pressure switching valve 32 and two master cylinders 4,5 rod chamber and the arbitrary oil circuit between the rodless cavity separately, and for example the other end of release oil circuit 33 is connected on the oil circuit between the rodless cavity D of the high low pressure switching valve 32 and first master cylinder 4 in Fig. 3.When twin-tub pumping system works, bi-bit bi-pass solenoid directional control valve 26 open in usual gets electric, and release oil circuit 33 is in by off state, when shutting down, and bi-bit bi-pass solenoid directional control valve 26 dead electricity open in usual, 33 conductings of release oil circuit.At this moment, even because of 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, though technological scheme shown in Figure 3 can prevent the play of piston rod, this technological scheme is under some state, and the pressure in the rod chamber of two master cylinders 4,5 and the part chamber in the rodless cavity possibly can not in time be laid down because of accidental cause.As the preferred form of implementation of another kind; Referring to shown in Figure 4, the switch valve that adopts on the release oil circuit 33 is a bi-bit bi-pass solenoid directional control valve 26 open in usual, a termination fuel tank of release oil circuit 33; The other end is connected to the reverse port of first one-way valve 27 and second one-way valve 28; The forward port of said first one-way valve 27 is connected in the second actuator port B of main reversing valve 3, and the forward port of second one-way valve 28 is connected in the first actuator port A of main reversing valve 3, and the forward port of relevant one-way valve, the differentiation of reverse port are known; Be forward conduction, direction is ended.Like this, during work, solenoid valve 26; Selector valve 3A mouth and B mouth and fuel tank break off, but system's proper functioning, during shutdown; Bi-bit bi-pass solenoid directional control valve 26 dead electricity open in usual, 33 conductings of release oil circuit, two master cylinders 4; 5 the rod chamber and the hydraulic oil of rodless cavity can flow back to fuel tank via release oil circuit 33 through first one-way valve 27 or second one-way valve 28 when the first actuator port A that flow to main reversing valve 3 and the second actuator port B, simultaneously because the annexation of first one-way valve 27 and second one-way valve 28; The higher hydraulic oil of the release oil circuit 33 preferential release oil pressure of meeting; In case the oil pressure dump in the part chamber, because equilibrium of forces, other chamber of master cylinder also can release.
As shown in Figure 5; As a kind of selectable variant; Can the bi-bit bi-pass solenoid directional control valve 26 open in usual among Fig. 4 be replaced by Normally closed type bi-bit bi-pass solenoid directional control valve 29 among Fig. 5; This selectable variant makes Normally closed type bi-bit bi-pass solenoid directional control valve 29 dead electricity and keeps release oil circuit 33 to break off when twin-tub pumping system proper functioning.When stopping pumping, thus Normally closed type bi-bit bi-pass solenoid directional control valve 29 electric making the 33 conducting scheduled times of release oil circuit (for example 1-5 second), thereby the high oil pressure of removal master cylinder 4,5.This selectable variant is owing to making only conducting preset time of release oil circuit 33; Master cylinder 4; Hydraulic oil in 5 can not flow back to fuel tank in a large number, therefore can prevent effectively because the off-load of release oil circuit causes the material (for example concrete) in the conveyance conduit to flow backwards.Certainly; In Fig. 3 and mode of execution shown in Figure 4; Through controlling the dead electricity time of bi-bit bi-pass solenoid directional control valve 26 open in usual, also can obtain this kind technique effect, bi-bit bi-pass solenoid directional control valve 26 open in usual can adopt independently control circuit under this situation certainly.
Because the potential safety hazard when the present invention prevents that the purpose of piston rod play of the master cylinder of twin-tub pumping installations is mainly that eliminating inspection safeguards, for example at the play of 14,15 o'clock piston rods of Sealing of changing pumping piston 12,13.Therefore, when changing Sealing, pumping piston 12 or 13 must return to water tank 16; Can whether be positioned at water tank 16 through detecting piston; As shown in Figure 6, preferably, can be provided with in the said water tank 16 and be used to detect pumping piston 12; Whether 13 be positioned at the position detecting device of water tank 16, and this position detecting device can comprise the primary importance detection device 30 and the second place detection device 31 that is used to detect pumping piston 13 that is used to detect pumping piston 12.Primary importance detection device 30 can adopt multiple known sensor with second place detection device 31; For example magnetic resistance type linear displacement transducer, Hall transducer etc.; Certainly under this situation; Primary importance detection device 30 can be electrically connected on corresponding controller with second place detection device 31; This controller is electrically connected on Normally closed type bi-bit bi-pass solenoid directional control valve 29 (so long as the electrically switchable grating valve gets final product), 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 the conducting of control release oil circuit 33 ends.Through primary importance detection device 30 and second place detection device 31, detect pumping piston 12,13 and whether return water tank 16; If the corresponding returned water tank 16 of pumping piston when then stopping pumpdown, makes Normally closed type bi-bit bi-pass solenoid directional control valve 29 get earlier; 33 conductings of release oil circuit, the 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 (for example 2 seconds); Normally closed type bi-bit bi-pass solenoid directional control valve 29 dead electricity; Each chamber sealing, but lay down because of oil pressure, sealing be low pressure oil.If piston is not return water tank, then no matter whether pumping moves, Normally closed type bi-bit bi-pass solenoid directional control valve 29 all must not.
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, said pumping equipment can be a concrete mixer.
Can find out by last description; The invention has the advantages that: the twin-tub pumping system that the invention provides the anti-play closing method of a kind of twin-tub pumping system and can realize this closing method; It increases a release step originally on the basis of existing twin-tub pumping system-down method; Thereby can make each chamber of master cylinder of twin-tub pumping system be in low pressure or passive state; The piston rod that has prevented master cylinder effectively is because high pressure oil and the play that meets accident of sealing, guaranteed maintainer's in the repair and maintenance working procedure of twin-tub pumping system safety relatively effectively.The anti-play closing method of twin-tub pumping system of the present invention has applicability at large; Especially can be applicable in the twin-tub pumping system with high low pressure switching valve effectively; The play of main oil cylinder piston bar when it prevents twin-tub pumping system-down relatively reliably; Make and make that the twin-tub pumping system is safer by twin-tub pumping system each cavity pressure of removal master cylinder effectively when shutting down.
More than combine accompanying drawing to describe preferred implementation of the present invention in detail; But; The present invention is not limited to the detail in the above-mentioned mode of execution; In technical conceive scope 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; Although below mainly sending system with the Concrete Double cylinder pump is that example is described; But the anti-play closing method of twin-tub pumping system of the present invention twin-tub pumping system capable and that be used to realize this method obviously is not limited to the Concrete Double cylinder pump and send the system field; But can be applicable to generality the control of the twin-tub pumping system that is used to carry other fluid foods; The for example shutdown of twin-tub such as mud, mortar pumping system control, the Concrete Double cylinder pump of correspondingly above-mentioned embodiment technical conceive of the present invention send system also can form the twin-tub pumping system that is used to carry other sticky material.
Need to prove that in addition each the concrete technical characteristics described in above-mentioned embodiment under reconcilable situation, can make up through any suitable manner.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible compound modes.
In addition, also can carry out combination in any between the various mode of execution of the present invention, as long as it is without prejudice to thought of the present invention, it should be regarded as the disclosed content of the present invention equally.

Claims (18)

1. the anti-play closing method of twin-tub pumping system, said twin-tub pumping system comprise the twin-tub pumping installations with two master cylinders (4,5) and the hydraulic control system of this twin-tub pumping installations, and said closing method comprises the steps:
The first, control said twin-tub pumping installations and stop pumpdown, thereby make rod chamber and rodless cavity and the oil-feed oil circuit of said two master cylinders (4,5) and oil return circuit all be in cut-off state;
The second, make the rod chamber of said two master cylinders (4,5) and at least one chamber in the rodless cavity be communicated with fuel tank or oil return circuit.
2. closing method according to claim 1 wherein, in said second step, makes the rod chamber of said two master cylinders (4,5) and at least one chamber in the rodless cavity be communicated with the scheduled time with fuel tank or oil return circuit.
3. closing method according to claim 2, wherein, the said scheduled time is 1-5 second.
4. closing method according to claim 1 wherein, in said first step, is controlled said twin-tub pumping installations and is switched under low pressure pumping state and stop pumpdown.
5. closing method according to claim 1; Wherein, in said first step, at a pumping piston (12 of said twin-tub pumping installations; 13) stop under the situation in the water tank (16) of this twin-tub pumping installations, control said twin-tub pumping installations and stop pumpdown.
6. closing method according to claim 5; Wherein, in said first step, detecting a pumping piston (12 of said twin-tub pumping installations; 13) stop under the interior situation of said water tank (16), control said twin-tub pumping installations and stop pumpdown.
7. closing method according to claim 7, wherein, said twin-tub pumping system send system for the Concrete Double cylinder pump, and said twin-tub pumping installations send device for the Concrete Double cylinder pump.
8. according to each described closing method in the claim 1 to 7, wherein, in said second step, make the whole rod chambers and the rodless cavity of master cylinder (4,5) of said twin-tub pumping installations be communicated with fuel tank or oil return circuit.
9. the twin-tub pumping system comprises twin-tub pumping installations and hydraulic control system thereof, and said twin-tub pumping installations comprises two master cylinders (4; 5), wherein, said hydraulic control system also comprises release oil circuit (33); One end of this release oil circuit (33) is connected in fuel tank or oil return circuit; The other end is connected in the rod chamber of said two master cylinders (4,5) and at least one chamber in the rodless cavity via corresponding oil circuit, and said release oil circuit (33) is provided with switch valve; Can control the rod chamber of said master cylinder (4,5) when the said twin-tub pumping system-down and at least one chamber in the rodless cavity is communicated with fuel tank or oil return circuit.
10. twin-tub pumping system according to claim 9; Wherein, Said hydraulic control system comprises main reversing valve (3) and high low pressure switching valve (32); Each interface of this high low pressure switching valve (32) is connected to said two master cylinders (4, the 5) rod chamber separately and first actuator port (A) and second actuator port (B) of rodless cavity and said main reversing valve (3).
11. twin-tub pumping system according to claim 10; Wherein, Said main reversing valve (3) is M type three position four-way directional control valve or O type three position four-way directional control valve, and the filler opening (P) of this main reversing valve (3) is connected in the pumping oil circuit, and return opening (T) is connected in fuel tank; First actuator port (A) is connected said two master cylinders (4,5) via said high low pressure switching valve (32) respectively with second actuator port (B).
12. twin-tub pumping system according to claim 10, wherein, said high low pressure switching valve (32) comprises 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 the hydraulic control oil circuit, and said hydraulic control oil circuit comprises two-position four way change valve, and the filler opening of this two-position four way change valve (P1) is respectively via an one-way valve (24; 25) the pumping oil circuit that is connected in said hydraulic control system with distribute oil circuit, return opening (T1) is connected in fuel tank, first actuator port (A1) is connected in said the 4th to the 6th two-way plug-in valve (20,21; 22) hydraulic control mouth, second actuator port (B1) are connected in said first to the 3rd two-way plug-in valve (17,18; 19) hydraulic control mouth, wherein two said one-way valves (24,25) reverse port separately is communicated with the filler opening of said two-position four way change valve (P1).
13. twin-tub pumping system according to claim 10, wherein, the other end of said release oil circuit (33) is connected on any oil circuit in the oil circuit between said high low pressure switching valve (32) and said two master cylinders (4,5).
14. twin-tub pumping system according to claim 10; Wherein, The other end of said release oil circuit (33) is connected to the reverse port of first one-way valve (27) and second one-way valve (28); The forward port of said first one-way valve (27) is connected in second actuator port (B) of said main reversing valve (3), and the forward port of said second one-way valve (28) is connected in first actuator port (A) of said main reversing valve (3).
15. according to each described twin-tub pumping system in the claim 9 to 14, wherein, the switch valve on the said release oil circuit (33) is the electrically switchable grating valve.
16. twin-tub pumping system according to claim 15, wherein, said electrically switchable grating valve is bi-bit bi-pass solenoid directional control valve open in usual (26) or Normally closed type bi-bit bi-pass solenoid directional control valve (29).
(annotate: Fig. 4 is to switch valve shown in Figure 6 form more specifically)
17. twin-tub pumping system according to claim 15 wherein, is provided with the position detecting device whether pumping piston (12,13) that is used to detect this twin-tub pumping installations is positioned at said water tank (16) in the water tank of said twin-tub pumping installations (16).
18. pumping equipment, wherein, this pumping equipment comprises according to each described twin-tub pumping system in the claim 9 to 17.
CN201210349195.1A 2012-09-19 2012-09-19 Anti-channeling shutdown method for double-cylinder pumping system, double-cylinder pumping system and pumping equipment Active CN102840123B (en)

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