CN103104434A - 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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- CN103104434A CN103104434A CN2011103577854A CN201110357785A CN103104434A CN 103104434 A CN103104434 A CN 103104434A CN 2011103577854 A CN2011103577854 A CN 2011103577854A CN 201110357785 A CN201110357785 A CN 201110357785A CN 103104434 A CN103104434 A CN 103104434A
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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 the enclosed pumping technology, relate in particular to concrete piston automatic retracting device in a kind of enclosed pumping system.
Background technique
Concrete mixer is a kind of engineering construction construction plant that utilizes pressure that concrete is carried continuously by pipeline.In the mechanical pumping system of concrete mixer, the concrete piston belongs to easily damaged parts, needs running check, cleaning, replacing, if change untimelyly, not only has a strong impact on pumping construction, and very easily causes the scuffing of concrete cylinder to damage, and results in greater loss.
During due to work, the concrete piston is in the concrete cylinder, the concrete piston must be retracted in tank from the concrete cylinder can dismantle during replacing.Therefore need often the concrete piston to be retracted into tank in the concrete cylinder in the working service process, with abrasion condition or the replacing concrete piston that checks the concrete piston.This shows, whether the concrete piston is return convenient, extremely important concerning operator, too high to operator's professional skill requirement if operating process is too complicated, will affect the maintenance efficiency of equipment, causes inconvenient, the uneasy congruent problem safeguarded.
After the concrete piston is return, in order to ensure operator safety, prevent that operator from being squeezed wound by the concrete piston, in changing Piston Process, requirement must be with power cut, and turns off power source.Therefore just require in the power cut process, the concrete piston does not allow the misoperations such as occurrence positions drift, if the concrete piston position drifts about, will cause the concrete piston to be changed more difficult, the situation can't take out the concrete piston even occurs, and concrete pumping construction and equipment are all made a big impact.
The enclosed hydraulic system of pump is one of concrete pumping machinery hydraulic system commonly used, the basic structure of so-called enclosed pumping system is that two hydraulic fluid ports of main pump directly are connected with master cylinder, there is no main valve, realize the commutation of master cylinder by the flow direction that changes main pump two hydraulic fluid port hydraulic oil, there is no medium tache in this commutation process, can the build-up of pressure loss.Compare with the open type hydraulic system of pump, the enclosed hydraulic system of pump has pumping and impacts the advantages such as little, that commutation is steady, and therefore application is very extensive in concrete pumping machinery, accounts for more than 60%.
As shown in Figure 1, be the structural representation of enclosed hydraulic system of pump in prior art.In Fig. 1, when needs are retracted into tank 7 with concrete piston 8, must open pumping, start simultaneously the pumping switch that builds the pressure, purpose is to cut off the pumping commutation function, after making master cylinder 6 run to commutation position, not carrying out the commutation action, but moving forward.Main oil cylinder piston 5 inwardly bounces back, and starts simultaneously piston and returns switch, and after piston was return solenoid valve 3 energisings, the back cavity of auxiliary cylinder 4 just was communicated with fuel tank T, thereby concrete piston 8 is retracted in tank 7, and the final cutting engine power is changed first concrete piston 8.
When needs are changed second concrete piston 10, need ato unit again, and unlatching pumping, first allow the concrete piston 8 of more finishing changing 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 simultaneously the cooperation of the switch that builds the pressure, and could realize that the concrete piston is retracted into tank, operates more loaded down with trivial detailsly, and operator's professional skill is had relatively high expectations.
Because need to relying on, prior art repeatedly opens pumping, could realize that the concrete piston is retracted into tank, when pumpdown, the moving direction of two concrete pistons is opposite, 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 efficient of concrete piston is lower, the 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 to rely on 7 two actuator port (A of 1 pair of main oil pump of slippage pump during work, B) continue repairing, to guarantee that the main pump inlet port remains certain pressure, prevent inlet port hypotony damage main oil pump 7, can also play simultaneously the effect of rinsing and dispelling the heat, so 7 two actuator port (A of main oil pump, B) has all the time the pressure of 3MPa left and right, this pressure-acting is at two master cylinders 6, 6 ' rod chamber 602, 602 ', and master cylinder 6, 6 ' will realize static balancing, two rodless cavities 601, 601 ' must also can produce certain pressure, its pressure size and master cylinder 6, 6 ' Area Ratio is relevant.
The existence of this pressure just, make concrete piston 8 after being retracted into tank 7, carry out in the power cut process, because main pump 2 rotating speeds reduce and power cut gradually, main pump actuator port A, B pressure descend rapidly, after master cylinder rod chamber 602 pressure decreaseds, because of the existence of rodless cavity 601 pressure, can promote main oil cylinder piston bar 501 protruding, thereby cause concrete piston 8 positions to drift about, cause concrete piston 8 to change difficulty and strengthen, even cannot take out the situation of concrete piston 8.
Summary of the invention
The objective of the invention is to propose concrete piston automatic retracting device in a kind of enclosed pumping system, make the concrete piston in the enclosed pumping system automatically to return, the 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 that at least two groups have 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 ') separate described rodless cavity (601, 601 ') and rod chamber (602, 602 '), described rod chamber (602, 602 ') in described main oil cylinder piston (5, 5 ') piston rod (501 that connects, 501 ') a end is equiped with concrete piston (8, 10), described rod chamber (602, 602 ') have default oil pressure in, described concrete piston automatic retracting device is included in described rodless cavity (601, 601 ') and the first control valve that arranges in the oil circuit between fuel tank (T), described the first control valve is under the state of unlatching, described rodless cavity (601, 601 ') be communicated with described rod chamber (602 with fuel tank (T), 602 ') the default oil pressure in promotes described main oil cylinder piston (5, 5 ') compression rodless cavity (601, 601 '), and drive described concrete piston (8, 10) retract, described rodless cavity (601, 601 ') hydraulic oil in flows to described fuel tank (T).
In technique scheme, all the time exist the default oil pressure that slippage pump provides in rod chamber, when needs retraction concrete piston, open the control valve between rodless cavity and fuel tank, make rodless cavity and fuel tank be in connected state, just can utilize this moment the oil pressure in rod chamber to promote main oil cylinder piston and then drive concrete piston retraction, thereby realize automatically returning of concrete piston.This process need not to open pumping, relies on the oil pressure in rod chamber to complete, and a plurality of master cylinder all can return corresponding concrete piston by this mode automatically, makes to change efficient and significantly improve.
Further, described the first control valve is one group, is arranged in the oil circuit and the oil circuit between fuel tank (T) that communicates between described rodless cavity (601) and rodless cavity (601 ').
Further, described the first control valve is two groups, is separately positioned in the oil circuit between described rodless cavity (601) and fuel tank (T) and the oil circuit between rodless cavity (601 ') and fuel tank (T).
Further, described the first control valve comprises a directional control valve or switch valve.
Preferably, described the first control valve comprises the valve of both direction at least or the switch valve that is connected in series.Consider the single valve structure if there is the system failure or operate miss, may cause the mistake of concrete piston to be return, therefore realize error-disable function with two or more valves.
Preferably, described the first control valve comprises solenoid valve (11) and the ball valve (12) that is connected in series.Solenoid valve is sliding valve structure, may occur hydraulic oil in working procedure and reveal, and the pumping master cylinder stroke that can avoid causing because of the little leakage of system by the ball valve that increases shortens, and the commutation number of times becomes many problems.
further, between the described rodless cavity (601) of arbitrary master cylinder (6) and rod chamber (602), oil circuit (603) is set, and the second control valve and direction are set in this oil circuit (603) are the one-way valve (13) from described rod chamber (602) to described rodless cavity (601), described the second control valve is opened, and under the state that the first control valve is closed, hydraulic oil in described rod chamber (602) flows into described rodless cavity (601) by described one-way valve (13), flowed into again the rodless cavity (601 ') of another master cylinder (6 ') by described rodless cavity (601), the hydraulic oil that flows into described rodless cavity (601 ') promotes described main oil cylinder piston (5 ') compression rod chamber (602 '), and drive described concrete piston (10) and stretch out.
In technique scheme, by resetting the master cylinder that oil circuit controls after the concrete piston is return replacing is set between rod chamber and rodless cavity, so that follow-up unlatching pumping.
Further, described the second control valve is directional control valve or switch valve.
Based on technique scheme, the present invention is communicated with rodless cavity on the basis of existing enclosed pumping system with fuel tank, utilize the pressure difference between rod chamber and rodless cavity to promote main piston, driving the concrete piston returns automatically, this process need not to rely on pumping operation, but also the pump piston that a plurality of master cylinders drive is return simultaneously automatically, not only saves power, and simple to operate, change efficient higher; This fall back process realizes under power cut simultaneously, and the concrete piston is fixed on end position all the time, has avoided the concrete piston position drift and the large problem of replacing difficulty brought.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction 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 enclosed pumping system of having used an embodiment of 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 the enclosed pumping system is when not pumping, the default intrinsic pressure that provided by slippage pump (such as 3MPa etc.) has been provided the rod chamber of master cylinder all the time, if and this pressure is converted to the power that promotes main oil cylinder piston, can realize and automatically the returning of the concrete piston of main oil cylinder piston interlock, and this conversion can realize by the oil pressure that discharges in rodless cavity.The present invention connects rodless cavity and fuel tank, the poor main oil cylinder piston that can promote of oil pressure between rod chamber and rodless cavity is to the direction motion of rodless cavity at this moment, and the hydraulic oil in rodless cavity can be extruded in fuel tank, so just driven the retraction of concrete piston, when the main oil cylinder piston stop motion, the concrete piston has retracted to the position that can change.
As shown in Figure 2, used an embodiment's of the concrete piston automatic retracting device of the present invention structural representation of enclosed pumping system.in the present embodiment, the enclosed pumping system comprises at least two group master cylinders, shown in Fig. 2 is the enclosed pumping system that has comprised 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 an end of the piston rod 501 that is 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 an end of the piston rod 501 ' that is connected with main oil cylinder piston 5 ' in rod chamber 602 ' is equiped with concrete piston 10.All have default oil pressure in rod chamber 602 and rod chamber 602 ', this oil pressure is the intrinsic pressure that is provided by slippage pump 1.
Concrete piston automatic retracting device in the present embodiment is included in the first control valve that arranges in oil circuit between rodless cavity 601, rodless cavity 601 ' and fuel tank T.The first control valve can be set to many groups, matches with each master cylinder in a plurality of master cylinders respectively, can operate automatically returning of the corresponding concrete piston of each master cylinder separately.The first control valve also can be set to one group, and this group first control valve is controlled automatically returning simultaneously of the corresponding concrete piston of a plurality of master cylinders.The first control valve in Fig. 2 can to master cylinder 6 and master cylinder 6 ' respectively corresponding concrete piston 8 and automatically returning simultaneously of concrete piston 10 operate.
in Fig. 2, from being provided with the oil circuit 14 that is interconnected between rodless cavity 601 and rodless cavity 601 ', pick out the new oil circuit 15 of connecting with fuel tank T at this oil circuit, be provided with the first control valve in oil circuit 15, when this first control valve is under the state of unlatching, rodless cavity 601 and rodless cavity 601 ' all are communicated with fuel tank T, default oil pressure in rod chamber 602 and rod chamber 602 ' promotes respectively the space of main oil cylinder piston 5 and main oil cylinder piston 5 ' compression rodless cavity 601 and rodless cavity 601 ', and drive respectively concrete piston 8 and concrete piston 10 and retract, hydraulic oil in rodless cavity 601 and rodless cavity 601 ' flows to fuel tank T at this moment.
first control valve here 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 ' all are 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 ' be subject to respectively rodless cavity 601 and rodless cavity 601 ' inner sealing state hydraulic oil pressure and can't move to the replacing position of concrete piston, and when operator open the first control valve by the mode such as manual or electronic, rodless cavity 601 and rodless cavity 601 communicate with fuel tank T, the default oil pressure that provides of slippage pump 1 promotes main oil cylinder piston 5 and main oil cylinder piston 5 ' drives its concrete piston 8 that links and concrete piston 10 retractions.
In the prior art, when hope realizes the replacing of two concrete pistons, the traffic direction of two concrete pistons during due to pumpdown is opposite, therefore two concrete pistons must be return successively, therefore need to repeatedly open pumping, also need the to build the pressure cooperation of switch has caused the concrete piston to change efficient low, complicated operation like this.And automatically return when in enclosed pumping system of the present invention, concrete piston automatic retracting device can be realized a plurality of concrete piston, change when once realizing a plurality of concrete piston, and need not repeatedly to cut off power, open pumping and build the pressure the switch cooperation, therefore operation easier is lower, and replacing efficient significantly improves.
when the user only need change a concrete piston (for example the concrete piston 8), can first concrete piston 8 be returned to tank 7 from concrete cylinder 9, and before closing power, at first open ball valve 12, after controller is received the power shutdown signal, at first with solenoid valve 11 energisings, then close power, in whole power cut process, because rodless cavity 601 is in the pressure release state all the time prior to rod chamber 602, the pressure of rod chamber 602 is in because of engine speed in the power cut process process that progressively descends, pressure decreased is relatively slow, therefore in the 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.
Every group of first control valve all can be realized by single directional control valve or switch valve, also can be realized by the valve of both direction at least that is connected in series or switch valve, for example the solenoid valve that is connected in series 11 shown in Figure 2 and ball valve 12.Ball valve 12 can play error-disable function, avoid the misoperation to solenoid valve 11 because of operator, the mistake energising, the solenoid valve 11 that cause because of the system failure are stuck at on-position, the mistake of concrete piston in pumping procedure that occurs is return problem, avoids returning because of mistake the concrete that causes and enters tank and cause construction to interrupt.Be sliding valve structure because of solenoid valve 11 simultaneously, in the course of the work, unavoidably certain hydraulic fluid leak can occur, after the present invention added ball valve 12, the pumping master cylinder stroke of having avoided causing because of system's tiny leakage shortened, and the commutation number of times becomes many problems.
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 also is provided with in the present embodiment the device that the concrete piston resets after replacing, so that can work on.Between the rodless cavity of arbitrary master cylinder and rod chamber, oil circuit is set, and the second control valve and one-way valve are set in oil circuit.have additional oil circuit 603 between the rodless cavity 601 of master cylinder 6 and rod chamber 602 in Fig. 3, and the second control valve 16 and direction are set in this oil circuit 603 are 601 the one-way valve 13 from rod chamber 602 to rodless cavity, open at the second control valve 16, and under the state that the first control valve is closed, hydraulic oil in rod chamber 602 flows into rodless cavity 601 by one-way valve 13, flowed into again the rodless cavity 601 ' of another master cylinder 6 ' by rodless cavity 601, the hydraulic oil that flows into rodless cavity 601 ' promotes main oil cylinder piston 5 ' compression rod chamber 602 ', and drive concrete piston 10 stretches out, until arrival reset position.After arriving reset position, then the second control valve 16 is closed, thereby can carry out the normal operation process of enclosed pumping system.
Should be noted that at last: 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, the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or the part technical characteristics is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technological scheme scope that the present invention asks for protection.
Claims (8)
1. concrete piston automatic retracting device in an enclosed pumping system, described enclosed pumping system comprises that at least two groups have 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 ') separate described rodless cavity (601, 601 ') and rod chamber (602, 602 '), described rod chamber (602, 602 ') in described main oil cylinder piston (5, 5 ') piston rod (501 that connects, 501 ') a end is equiped with concrete piston (8, 10), described rod chamber (602, 602 ') have default oil pressure in, it is characterized in that, described concrete piston automatic retracting device is included in described rodless cavity (601, 601 ') and the first control valve that arranges in the oil circuit between fuel tank (T), described the first control valve is under the state of unlatching, described rodless cavity (601, 601 ') be communicated with described rod chamber (602 with fuel tank (T), 602 ') the default oil pressure in promotes described main oil cylinder piston (5, 5 ') compression rodless cavity (601, 601 '), and drive described concrete piston (8, 10) retract, described rodless cavity (601, 601 ') hydraulic oil in flows to described fuel tank (T).
2. device according to claim 1, is characterized in that, described the first control valve is one group, is arranged in the oil circuit and the oil circuit between fuel tank (T) that communicates between described rodless cavity (601) and rodless cavity (601 ').
3. device according to claim 1, it is characterized in that, described the first control valve is two groups, is separately positioned in the oil circuit between described rodless cavity (601) and fuel tank (T) and the oil circuit between rodless cavity (601 ') and fuel tank (T).
4. according to claim 2 or 3 described devices, is characterized in that, described the first control valve comprises a directional control valve or switch valve.
5. according to claim 2 or 3 described devices, is characterized in that, described the first control valve comprises the valve of both direction at least or the switch valve that is connected in series.
6. device according to claim 5, is characterized in that, described the first control valve comprises solenoid valve (11) and the ball valve (12) that is connected in series.
7. according to claim 2 or 3 described devices, it is characterized in that, between the described rodless cavity (601) of arbitrary master cylinder (6) and rod chamber (602), oil circuit (603) is set, and the second control valve and direction are set in this oil circuit (603) are the one-way valve (13) from described rod chamber (602) to described rodless cavity (601), described the second control valve is opened, and under the state that the first control valve is closed, hydraulic oil in described rod chamber (602) flows into described rodless cavity (601) by described one-way valve (13), flowed into again the rodless cavity (601 ') of another master cylinder (6 ') by described rodless cavity (601), the hydraulic oil that flows into described rodless cavity (601 ') promotes described main oil cylinder piston (5 ') compression rod chamber (602 '), and drive described concrete piston (10) and stretch out.
8. device according to claim 7, is characterized in that, described the second control valve is directional control valve or switch valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
|---|---|---|---|
| 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 true CN103104434A (en) | 2013-05-15 |
| CN103104434B CN103104434B (en) | 2015-06-03 |
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| CN201110357785.4A Active CN103104434B (en) | 2011-11-14 | 2011-11-14 | Concrete piston automatic returning device in closed type pumping system |
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Cited By (2)
| 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 |
| CN114635885A (en) * | 2022-05-18 | 2022-06-17 | 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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| 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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| US20030170127A1 (en) * | 2000-07-24 | 2003-09-11 | Werner Muenzenmaier | Thick matter pump |
| 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 |
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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 |
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Owner name: XUZHOU XUGONG SCHWING MACHINERY CO., LTD. Free format text: FORMER OWNER: XCMG CONSTRUCTION MACHINERY CO., LTD. Effective date: 20130802 |
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Effective date of registration: 20130802 Address after: 221004 No. 29, Peach Road, Xuzhou economic and Technological Development Zone, Jiangsu, Xuzhou Applicant after: XCMG Schwing Machinery Co., Ltd. Address before: 221004 No. 19 Peach Road, Xuzhou Economic Development Zone, Jiangsu, China Applicant before: XCMG Construction Machinery Co., Ltd. |
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