CN103104434B - Concrete piston automatic returning device in closed type pumping system - Google Patents
Concrete piston automatic returning device in closed type pumping system Download PDFInfo
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- CN103104434B CN103104434B CN201110357785.4A CN201110357785A CN103104434B CN 103104434 B CN103104434 B CN 103104434B CN 201110357785 A CN201110357785 A CN 201110357785A CN 103104434 B CN103104434 B CN 103104434B
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Abstract
The invention relates to a concrete piston automatic returning device in a closed type pumping system. The closed type pumping system comprises at least two groups of main oil cylinders (6 and 6') with rodless cavities (601 and 601') and with-rod cavities (602 and 602') and an oil tank (T). Concrete pistons (8 and 10) are arranged at one ends of piston rods (501 and 501') in the with-rod cavities (602 and 602'). Preset oil pressure exists in the with-rod cavities (602 and 602'). The concrete piston automatic returning device comprises a first control valve arranged between the rodless cavities (601 and 601') and the oil tank (T). When the first control valve is in an open state, the rodless cavities (601 and 601') are communicated with the oil tank (T), the preset oil pressure in the with-rod cavities (602 and 602') pushes main oil cylinder pistons (5 and 5') to press the rodless cavities (601 and 601'), and the concrete pistons (8 and 10) are driven to contract back. The concrete pistons in the closed type pumping system can return automatically, and changing convenience is brought to an operator.
Description
Technical field
The present invention relates to enclosed pumping technology, particularly relate to concrete piston automatic retracting device in a kind of enclosed pumping system.
Background technique
Concrete mixer is that a kind of pressure that utilizes is by the engineering construction construction plant of concrete by pipeline continus convergence.In the mechanical pumping system of concrete mixer, concrete piston belongs to easily damaged parts, needs running check, cleaning, replacing, if changed not in time, not only has a strong impact on pumping construction, and very easily causes the scuffing of concrete cylinder to damage, result in greater loss.
Because concrete piston is in concrete cylinder during work, concrete piston must be retracted in tank from concrete cylinder and can dismantles during replacing.Therefore need often concrete piston to be retracted into tank in concrete cylinder in working service process, to check the abrasion condition of concrete piston or to change concrete piston.As can be seen here, whether concrete piston is return and is facilitated, and concerning extremely important operator, if operating process is too complicated, requires too high, will affect the maintenance efficiency of equipment, cause and safeguard inconvenient, uneasy congruent problem the professional skill of operator.
After concrete piston is return, in order to ensure operator safety, prevent operator from being squeezed wound by concrete piston, in replacing Piston Process, requirement by power cut, and must turn off power source.Therefore just require in power cut process, concrete piston does not allow the misoperations such as occurrence positions drift, if concrete piston position drifts about, concrete piston will be caused to change more difficult, even there is the situation cannot taking out concrete piston, concrete pumping construction and equipment are all made a big impact.
Enclosed hydraulic system of pump is one of hydraulic system that concrete pumping machinery is conventional, the basic structure of so-called enclosed pumping system is that main pump two hydraulic fluid ports are directly connected with master cylinder, there is no main valve, the commutation of master cylinder is realized by the flow direction changing main pump two hydraulic fluid port hydraulic oil, medium tache is not had in this commutation process, can not build-up of pressure loss.Compared with open type hydraulic system of pump, enclosed hydraulic system of pump have pumping impact little, commutate the advantage such as steady, therefore apply in concrete pumping machinery widely, account for more than 60%.
As shown in Figure 1, be the structural representation of enclosed hydraulic system of pump in prior art.In FIG, when concrete piston 8 is retracted into tank 7 by needs, must open pumping, start pumping simultaneously and to build the pressure switch, object cuts off pumping commutation function, after making master cylinder 6 run to commutation position, do not perform commutation action, but move forward.Main oil cylinder piston 5 inwardly bounces back, and starts piston simultaneously and returns switch, and after piston returns solenoid valve 3 energising, the back cavity of auxiliary cylinder 4 is just communicated with fuel tank T, thus makes concrete piston 8 be retracted in tank 7, and final cutting engine power changes first concrete piston 8.
When needs replacing second concrete piston 10, need ato unit again, and open pumping, the concrete piston 8 more finished changing first is allowed to come back in concrete cylinder 9, after completing once commutation by pumping system, again start the switch that builds the pressure, make second concrete piston 10 be retracted into tank 7, then cut off engine power, change second concrete piston 10.
Prior art need rely on repeatedly to be cut off engine power and opens pumping, relies on the cooperation of the switch that builds the pressure simultaneously, could realize concrete piston and be retracted into tank, operate more loaded down with trivial details, require higher to operator's professional skill.
Repeatedly pumping is opened because prior art needs to rely on, could realize concrete piston and be retracted into tank, when pumpdown, the moving direction of two concrete pistons is contrary, so two concrete pistons must be return successively, can not realize returning simultaneously, and in Renewal process, need repeatedly open and cut off engine power, repeatedly open pumping, could realize returning and changing of two pistons, the replacing efficiency of concrete piston is lower, operation more complicated.
As can be seen from Figure 1, the working connection oil sources of enclosed hydraulic system of pump comes from slippage pump 1, need during work to rely on slippage pump 1 pair of main oil pump 2 two actuator port (A, B) lasting repairing is carried out, to ensure that main pump inlet port remains certain pressure, prevent inlet port hypotony from damaging main oil pump 2, the effect of rinsing and dispelling the heat can also be played simultaneously, therefore main oil pump 2 two actuator port (A, B) there is the pressure of about 3MPa all the time, this pressure acts on two master cylinders 6, the rod chamber 602 of 6 ', 602 ', and master cylinder 6, 6 ' will realize static balancing, two rodless cavities 601, 601 ' also must can produce certain pressure, its pressure size and master cylinder 6, the area ratio of 6 ' is relevant.
The existence of this pressure just, make concrete piston 8 after being retracted into tank 7, carry out in power cut process, because main oil pump 2 rotating speed reduces and power cut gradually, main pump actuator port A, B pressure declines rapidly, after master cylinder rod chamber 602 pressure reduces, because of the existence of rodless cavity 601 pressure, main oil cylinder piston bar 501 can be promoted protruding, thus cause concrete piston 8 position to drift about, cause concrete piston 8 to change difficulty to strengthen, even cannot take out the situation of concrete piston 8.
Summary of the invention
The object of the invention is to propose concrete piston automatic retracting device in a kind of enclosed pumping system, the concrete piston in enclosed pumping system can be return automatically, easy-to-operat personnel change.
For achieving the above object, the invention provides concrete piston automatic retracting device in a kind of enclosed pumping system, described enclosed pumping system comprises at least two groups and has rodless cavity (601, 601 ') and rod chamber (602, 602 ') master cylinder (6, 6 ') with fuel tank (T), the main oil cylinder piston (5 in described master cylinder, 5 ') described rodless cavity (601 is separated, 601 ') and rod chamber (602, 602 '), described rod chamber (602, 602 ') with described main oil cylinder piston (5 in, 5 ') piston rod (501 connected, 501 ') one end is equiped with concrete piston (8, 10), described rod chamber (602, 602 ') exist in and preset oil pressure, described concrete piston automatic retracting device is included in described rodless cavity (601, 601 ') the first control valve arranged in the oil circuit and between fuel tank (T), under the state that described first control valve is in unlatching, described rodless cavity (601, 601 ') be communicated with fuel tank (T), described rod chamber (602, 602 ') the default oil pressure in promotes described main oil cylinder piston (5, 5 ') rodless cavity (601 is compressed, , and drive described concrete piston (8 601 '), 10) retract, described rodless cavity (601, 601 ') hydraulic oil in flows to described fuel tank (T), described rodless cavity (601,601 ') comprises the first rodless cavity (601) and the second rodless cavity (601 '), and described rod chamber (602,602 ') comprises the first rod chamber (602) and the second rod chamber (602 ').
In technique scheme, all the time the default oil pressure that slippage pump provides is there is in rod chamber, when needs retraction concrete piston, open the control valve between rodless cavity and fuel tank, rodless cavity and fuel tank is made to be in connected state, the oil pressure in rod chamber now just can be utilized to promote main oil cylinder piston and then drive concrete piston retracts, thus realize automatically returning of concrete piston.This process, without the need to opening pumping, can complete by means of the oil pressure in rod chamber, and multiple master cylinder all makes corresponding concrete piston automatically return by this mode, makes to change efficiency and significantly improves.
Further, described first control valve is one group, is arranged in the oil circuit between oil circuit and fuel tank (T) communicated between described first rodless cavity (601) and the second rodless cavity (601 ').
Further, described first control valve is two groups, and the oil circuit be separately positioned between described first rodless cavity (601) and fuel tank (T) neutralizes the oil circuit between the second rodless cavity (601 ') and fuel tank (T).
Further, described first control valve comprises a directional control valve or switch valve.
Preferably, described first control valve comprises at least both direction valve or switch valve that are connected in series.Consider that single valve structure is if there is the system failure or operate miss, then may cause by mistake returning of concrete piston, therefore use two or more valves to realize error-disable function.
Preferably, described first control valve comprises the solenoid valve (11) and ball valve (12) that are connected in series.Solenoid valve is sliding valve structure, may occur that hydraulic oil is revealed in working procedure, the pumping master cylinder stroke caused because of the micro-leakage of system can be avoided to shorten by the ball valve increased, and commutation number of times becomes many problems.
Further, between described first rodless cavity (601) and the first rod chamber (602) of arbitrary master cylinder (6), oil circuit (603) is set, and to arrange the second control valve and direction in this oil circuit (603) be one-way valve (13) from described first rod chamber (602) to described first rodless cavity (601), described second control valve is opened, and under the state of the first control valve closedown, hydraulic oil in described first rod chamber (602) flows into described first rodless cavity (601) by described one-way valve (13), the second rodless cavity (601 ') of another master cylinder (6 ') is flowed into again by described first rodless cavity (601), the hydraulic oil flowing into described second rodless cavity (601 ') promotes described main oil cylinder piston (5 ') and compresses the second rod chamber (602 '), and drive described concrete piston (10) to stretch out.
In technique scheme, by arrange between rod chamber and rodless cavity oil circuit control concrete piston return the master cylinder after replacing reset so that follow-up unlatching pumping.
Further, described second control valve is directional control valve or switch valve.
Based on technique scheme, rodless cavity is communicated with fuel tank by the present invention on the basis of existing enclosed pumping system, the pressure difference between rod chamber and rodless cavity is utilized to promote main piston, concrete piston is driven automatically to return, this process is without the need to relying on pumping operation, but also the pump piston that multiple master cylinder can be made to drive is return simultaneously automatically, not only saves power, and simple to operate, change efficiency higher; This fall back process realizes under power cut simultaneously, and concrete piston is fixed on end position all the time, avoids concrete piston position drift and the large problem of the replacing difficulty brought.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of enclosed pumping system in prior art.
Fig. 2 is the structural representation of the enclosed pumping system of the embodiment applying concrete piston automatic retracting device of the present invention.
Fig. 3 is the structural representation of concrete piston reset device in another embodiment of concrete piston automatic retracting device of the present invention.
Embodiment
Below by drawings and Examples, technological scheme of the present invention is described in further detail.
The present invention considers that enclosed pumping system is when not pumping, the rod chamber of master cylinder is present in the intrinsic pressure (such as 3MPa etc.) preset provided by slippage pump all the time, if and this pressure is converted to the power promoting main oil cylinder piston, then can realize automatically returning of the concrete piston linked with main oil cylinder piston, and this conversion, can be realized by the oil pressure in release rodless cavity.Rodless cavity and fuel tank are connected by the present invention, oil pressure difference now between rod chamber and rodless cavity can promote main oil cylinder piston and move to the direction of rodless cavity, and the hydraulic oil in rodless cavity can be extruded in fuel tank, so just drive the retraction of concrete piston, when main oil cylinder piston stop motion, concrete piston has retracted to the position that can change.
As shown in Figure 2, the structural representation of the enclosed pumping system of an embodiment of concrete piston automatic retracting device of the present invention is applied.In the present embodiment, enclosed pumping system comprises at least two group master cylinders, shown in Fig. 2 is the enclosed pumping system including master cylinder 6 and master cylinder 6 ', wherein master cylinder 6 has rodless cavity 601 and rod chamber 602, and separate this rodless cavity 601 and rod chamber 602 by the main oil cylinder piston 5 in master cylinder 6, and the one end of the piston rod 501 be connected with main oil cylinder piston 5 in rod chamber 602 is equiped with concrete piston 8, master cylinder 6 ' has rodless cavity 601 ' and rod chamber 602 ', and separate this rodless cavity 601 ' and rod chamber 602 ' by the main oil cylinder piston 5 ' in master cylinder 6 ', and the one end of the piston rod 501 ' be connected with main oil cylinder piston 5 ' in rod chamber 602 ' is equiped with concrete piston 10.All exist in rod chamber 602 and rod chamber 602 ' and preset oil pressure, this oil pressure is the intrinsic pressure provided by slippage pump 1.
Concrete piston automatic retracting device in the present embodiment is included in the first control valve arranged in rodless cavity 601, oil circuit between rodless cavity 601 ' and fuel tank T.First control valve can be set to many groups, matches respectively with each master cylinder in multiple master cylinder, can operate automatically returning of the concrete piston corresponding to each master cylinder separately.First control valve also can be set to one group, and this group first control valve controls automatically returning of the concrete piston corresponding to multiple master cylinder simultaneously.The first control valve in Fig. 2 can to master cylinder 6 and master cylinder 6 ' concrete piston 8 corresponding respectively and automatically returning of concrete piston 10 operate simultaneously.
In fig. 2, from being provided with the oil circuit 14 be interconnected between rodless cavity 601 and rodless cavity 601 ', the new oil circuit 15 connected with fuel tank T is picked out at this oil circuit, the first control valve is provided with in oil circuit 15, when under the state that this first control valve is in unlatching, rodless cavity 601 is all communicated with fuel tank T with rodless cavity 601 ', default oil pressure in rod chamber 602 and rod chamber 602 ' promotes the space that main oil cylinder piston 5 and main oil cylinder piston 5 ' compress rodless cavity 601 and rodless cavity 601 ' respectively, and drive concrete piston 8 and concrete piston 10 to retract respectively, hydraulic oil now in rodless cavity 601 and rodless cavity 601 ' flows to fuel tank T.
Here the first control valve can be realized by single directional control valve or switch valve, when the first control valve is closed, rodless cavity 601 and rodless cavity 601 ' are all in closed state, although slippage pump 1 provides intrinsic pressure for rod chamber 602 and rod chamber 602 ', but main oil cylinder piston 5 and main oil cylinder piston 5 ' are subject to the pressure of the hydraulic oil of rodless cavity 601 and rodless cavity 601 ' inner sealing state respectively and cannot move to the replacing position of concrete piston, and when operator manually or the mode such as electronic opens the first control valve time, rodless cavity 601 and rodless cavity 601 lead to fuel tank T-phase, the default oil pressure that then slippage pump 1 provides promotes concrete piston 8 that main oil cylinder piston 5 and main oil cylinder piston 5 ' drive it to link and concrete piston 10 bounces back.
In the prior art, when hope realizes the replacing of two concrete pistons, because the traffic direction of the concrete piston of two during pumpdown is contrary, therefore two concrete pistons must be return successively, therefore need repeatedly to open pumping, also need to build the pressure the cooperation of switch, and causing concrete piston like this, to change efficiency low, complicated operation.And concrete piston automatic retracting device is return while can realizing multiple concrete piston automatically in enclosed pumping system of the present invention, change while once realizing multiple concrete piston, and without the need to repeatedly cutting off power, opening pumping and the switch cooperation that builds the pressure, therefore operation easier is lower, and replacing efficiency significantly improves.
When user only need change a concrete piston (such as concrete piston 8), first concrete piston 8 can be returned to tank 7 from concrete cylinder 9, and before closedown power, first ball valve 12 is opened, after controller receives power shutdown signal, first solenoid valve 11 is energized, then power is closed, in whole power cut process, because rodless cavity 601 is in pressure release state all the time prior to rod chamber 602, the pressure of rod chamber 602 because of in power cut process engine speed be in the process that progressively declines, pressure reduces relatively slow, therefore in power cut process, the oil pressure of the rod chamber 602 of master cylinder 6 is all the time higher than rodless cavity 601, concrete piston 8 can be fixed on end position all the time, the position of concrete piston 8 can not drift about.
Often organize the first control valve all to be realized by single directional control valve or switch valve, also can be realized by least both direction valve be connected in series or switch valve, such as, the solenoid valve 11 be connected in series shown in Fig. 2 and ball valve 12.Ball valve 12 can play error-disable function, avoid because operator are to the misoperation of solenoid valve 11, the mistake caused because of the system failure is energized, solenoid valve 11 is stuck at on-position, occur concrete piston in pumping procedure return problem by mistake, avoid because of return by mistake the concrete caused enter tank cause construction interrupt.Simultaneously because solenoid valve 11 be sliding valve structure, in the course of the work, unavoidably there will be certain hydraulic fluid leak, after the present invention adds ball valve 12, avoid the pumping master cylinder stroke caused because of system tiny leakage and shorten, the problem more than commutation number of times becomes.
As shown in Figure 3, be the structural representation of concrete piston reset device in another embodiment of concrete piston automatic retracting device of the present invention.Master cylinder is also provided with the device that concrete piston resets afterwards in replacing in the present embodiment, so that can work on.Oil circuit is set between the rodless cavity and rod chamber of arbitrary master cylinder, and the second control valve and one-way valve are set in oil circuit.Oil circuit 603 is had additional between the rodless cavity 601 of master cylinder 6 and rod chamber 602 in Fig. 3, and to arrange the second control valve 16 and direction in this oil circuit 603 be one-way valve 13 from rod chamber 602 to rodless cavity 601, open at the second control valve 16, and under the state of the first control valve closedown, hydraulic oil in rod chamber 602 flows into rodless cavity 601 by one-way valve 13, the rodless cavity 601 ' of another master cylinder 6 ' is flowed into again by rodless cavity 601, the hydraulic oil flowing into rodless cavity 601 ' promotes main oil cylinder piston 5 ' and compresses rod chamber 602 ', and drive concrete piston 10 to stretch out, until arrival reset position.When after arrival reset position, then the second control valve 16 is closed, thus the normal progress of work of enclosed pumping system can be carried out.
Finally should be noted that: above embodiment is only in order to illustrate that technological scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technological scheme scope of request of the present invention protection.
Claims (8)
1. a concrete piston automatic retracting device in enclosed pumping system, described enclosed pumping system comprises at least two groups and has rodless cavity (601, 601 ') and rod chamber (602, 602 ') master cylinder (6, 6 ') with fuel tank (T), the main oil cylinder piston (5 in described master cylinder, 5 ') described rodless cavity (601 is separated, 601 ') and rod chamber (602, 602 '), described rod chamber (602, 602 ') with described main oil cylinder piston (5 in, 5 ') piston rod (501 connected, 501 ') one end is equiped with concrete piston (8, 10), described rod chamber (602, 602 ') exist in and preset oil pressure, it is characterized in that, described concrete piston automatic retracting device is included in described rodless cavity (601, 601 ') the first control valve arranged in the oil circuit and between fuel tank (T), under the state that described first control valve is in unlatching, described rodless cavity (601, 601 ') be communicated with fuel tank (T), described rod chamber (602, 602 ') the default oil pressure in promotes described main oil cylinder piston (5, 5 ') rodless cavity (601 is compressed, , and drive described concrete piston (8 601 '), 10) retract, described rodless cavity (601, 601 ') hydraulic oil in flows to described fuel tank (T), described rodless cavity (601,601 ') comprises the first rodless cavity (601) and the second rodless cavity (601 '), and described rod chamber (602,602 ') comprises the first rod chamber (602) and the second rod chamber (602 ').
2. device according to claim 1, it is characterized in that, described first control valve is one group, is arranged in the oil circuit between oil circuit and fuel tank (T) communicated between described first rodless cavity (601) and the second rodless cavity (601 ').
3. device according to claim 1, it is characterized in that, described first control valve is two groups, and the oil circuit be separately positioned between described first rodless cavity (601) and fuel tank (T) neutralizes the oil circuit between the second rodless cavity (601 ') and fuel tank (T).
4. the device according to Claims 2 or 3, is characterized in that, described first control valve comprises a directional control valve or switch valve.
5. the device according to Claims 2 or 3, is characterized in that, described first control valve comprises at least both direction valve or switch valve that are connected in series.
6. device according to claim 5, is characterized in that, described first control valve comprises the solenoid valve (11) and ball valve (12) that are connected in series.
7. the device according to Claims 2 or 3, it is characterized in that, between described first rodless cavity (601) and the first rod chamber (602) of arbitrary master cylinder (6), oil circuit (603) is set, and to arrange the second control valve and direction in this oil circuit (603) be one-way valve (13) from described first rod chamber (602) to described first rodless cavity (601), described second control valve is opened, and under the state of the first control valve closedown, hydraulic oil in described first rod chamber (602) flows into described first rodless cavity (601) by described one-way valve (13), the second rodless cavity (601 ') of another master cylinder (6 ') is flowed into again by described first rodless cavity (601), the hydraulic oil flowing into described second rodless cavity (601 ') promotes described main oil cylinder piston (5 ') and compresses the second rod chamber (602 '), and drive described concrete piston (10) to stretch out.
8. device according to claim 7, is characterized in that, described second control valve is directional control valve or switch valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110357785.4A CN103104434B (en) | 2011-11-14 | 2011-11-14 | Concrete piston automatic returning device in closed type pumping system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110357785.4A CN103104434B (en) | 2011-11-14 | 2011-11-14 | Concrete piston automatic returning device in closed type pumping system |
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| CN103104434A CN103104434A (en) | 2013-05-15 |
| CN103104434B true CN103104434B (en) | 2015-06-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114575596A (en) * | 2022-01-25 | 2022-06-03 | 北京城建十六建筑工程有限责任公司 | Pump sending concrete measurement system |
| CN114635885B (en) * | 2022-05-18 | 2022-08-19 | 徐工集团工程机械股份有限公司建设机械分公司 | Oil cylinder driven closed type traveling system and working method thereof |
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| CN2526541Y (en) * | 2001-11-01 | 2002-12-18 | 三一重工股份有限公司 | Pumping mechanism easy to replace concrete piston |
| CN200958466Y (en) * | 2005-12-29 | 2007-10-10 | 长沙中联重工科技发展股份有限公司 | Concrete pump transferring mechanism |
| CN101776053A (en) * | 2010-03-16 | 2010-07-14 | 三一重工股份有限公司 | Concrete pumping structure |
| CN101793246A (en) * | 2010-03-16 | 2010-08-04 | 三一重工股份有限公司 | Concrete pumping structure and control method of concrete pumping structure |
| CN202468189U (en) * | 2011-11-14 | 2012-10-03 | 徐工集团工程机械股份有限公司 | Concrete piston automatic retracting apparatus of enclosed pumping system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10036202A1 (en) * | 2000-07-24 | 2002-02-07 | Putzmeister Ag | Slurry pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2526541Y (en) * | 2001-11-01 | 2002-12-18 | 三一重工股份有限公司 | Pumping mechanism easy to replace concrete piston |
| CN200958466Y (en) * | 2005-12-29 | 2007-10-10 | 长沙中联重工科技发展股份有限公司 | Concrete pump transferring mechanism |
| CN101776053A (en) * | 2010-03-16 | 2010-07-14 | 三一重工股份有限公司 | Concrete pumping structure |
| CN101793246A (en) * | 2010-03-16 | 2010-08-04 | 三一重工股份有限公司 | Concrete pumping structure and control method of concrete pumping structure |
| CN202468189U (en) * | 2011-11-14 | 2012-10-03 | 徐工集团工程机械股份有限公司 | Concrete piston automatic retracting apparatus of enclosed pumping system |
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