CN101793247A - Concrete pump truck and concrete delivery pump exchange system - Google Patents
Concrete pump truck and concrete delivery pump exchange system Download PDFInfo
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- CN101793247A CN101793247A CN200910005621A CN200910005621A CN101793247A CN 101793247 A CN101793247 A CN 101793247A CN 200910005621 A CN200910005621 A CN 200910005621A CN 200910005621 A CN200910005621 A CN 200910005621A CN 101793247 A CN101793247 A CN 101793247A
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Abstract
The invention discloses a concrete delivery pump exchange system. After a concrete piston passes over the first position near the stroke end of the piston, the delivery capacity of the hydraulic pump of a pumping main cylinder is reduced so as to realize the pre-deceleration of the concrete piston; after the concrete piston passes over the second position further near the stroke end of the piston, the delivery capacity of the hydraulic pump can be reduced once again, so that the delivery capacity of the hydraulic pump remains a lower level; and then, when the delivery capacity of the hydraulic pump is lower, even close to zero drainage, the flow direction of the hydraulic oil in the pumping main cylinder is changed via an exchange device, thus the impact and the vibration caused by the direction change of the hydraulic oil in the pumping main cylinder are effectively reduced, and the stability of the concrete pump car in the working process can be greatly enhanced.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly relate to a kind of concrete mixer.The invention still further relates to a kind of concrete pump reversing mechanism that is used for concrete mixer.
Background technique
At present, concrete mixer has obtained using widely at the construction field (site).During pump concrete, concrete mixer promotes two concrete piston to-and-fro motion of carrying in the cylinder barrel respectively by two pumping master cylinders.Concrete piston bounces back under the drive of pumping master cylinder, thereby sucks concrete in carrying cylinder barrel; Simultaneously, another carries the concrete piston in the cylinder barrel to stretch out under the drive of pumping master cylinder, so that its concrete that sucks in advance in a last stroke is released, thereby finishes pumping.For guaranteeing the continuity of pumping, two pumping master cylinders drive a concrete piston respectively and back and forth move in carrying cylinder barrel, alternately commutate, and therefore concrete can constantly be pumped out.
Because the commutating frequency higher (per minute is more than 20 times) of concrete piston, the hydraulic oil in the pumping master cylinder also needs frequent commutation.Near when concrete piston moves to the bottom of carrying cylinder barrel in the pumping master cylinder hydraulic oil needs commutation, factors such as motional inertia during commutation in the hydraulic energy of oil hydraulic pump, the pumping master cylinder can cause bigger impact, and cause the generation high vibration of car load and jib, have a strong impact on pumpdown, reduced the reliability and the working life of associated components.
In the prior art, can alleviate the hydraulic shock in the commutation process by the method for optimizing main reversing valve transition meta, but, in the moment of main reversing valve commutation, owing to there is the commutation dead band, the fuel-displaced hyperbaric chamber of oil hydraulic pump at first moment close, communicate and reduce pressure with oil back chamber then, open suddenly more at last.When valve port was closed suddenly, oil hydraulic pump pressure oil was had nowhere to go, and therefore will produce bigger surge pressure; When valve port is opened suddenly,, will produce bigger startup again and impact because of the existence of the moment conversion of liquid flow path direction and the resistance of start.So it is unsatisfactory to optimize the cushioning effect that the method institute of main reversing valve transition meta can realize, the compression shock in the commutation process and vibrate comparatively obvious.
Therefore, impact that commutation brought and the vibration how effectively to alleviate hydraulic oil in the pumping master cylinder are the present technical issues that need to address of those skilled in the art.
Summary of the invention
The purpose of this invention is to provide a kind of concrete pump reversing mechanism, the shock and vibration that commutation brought of hydraulic oil are less in its pumping master cylinder.Another object of the present invention provides a kind of concrete mixer that comprises above-mentioned concrete pump reversing mechanism.
For solving the problems of the technologies described above, the invention provides a kind of concrete pump reversing mechanism, it is characterized in that, comprise piston position detecting device, be used for detecting concrete piston in the position of carrying cylinder barrel; Control gear receives the position signal from described piston position detecting device, and sends instruction according to this position signal; When described concrete piston arrived primary importance near its stroke end, described control gear reduced the hydraulic pressure pump delivery that drives the pumping master cylinder; When described concrete piston arrived further the second place near its stroke end, described control gear reduced described hydraulic pressure pump delivery once more; Through after first scheduled time, the flow direction of hydraulic oil changes by reversing arrangement in the pumping master cylinder again.
Preferably, when described concrete piston arrived described primary importance, described control gear was reduced to described hydraulic pressure pump delivery the 25%-30% of former discharge capacity.
Preferably, the spacing range of described primary importance, the second place is 90mm-100mm, and the spacing range of the stroke end of the described second place and described concrete piston is 45mm-55mm.
Preferably, described piston position detecting device is the pressure reduction induction relay, described pressure reduction induction relay judges according to two pressure dependences that detect between the mouth being located at the described primary importance and the second place respectively whether described concrete piston crosses the described primary importance or the second place.
Preferably, when described concrete piston arrives the described second place, described control gear to described reversing arrangement send change hydraulic oil flow in the pumping master cylinder to signal.
Preferably, described concrete piston stroke end is provided with detects mouth, and this detection mouth links to each other with two control ends of pressure reduction Inductance valve respectively with the detection mouth that is in the described second place; When described concrete piston arrives the described second place, described pressure reduction Inductance valve to described reversing arrangement send change hydraulic oil flow in the pumping master cylinder to signal.
Preferably, described control gear further comprises electro-hydraulic proportional reducing valve, and changes the delivery pressure of described electro-hydraulic proportional reducing valve according to the position signal from described piston position detecting device, and then changes described hydraulic pressure pump delivery.
Preferably, after the flow direction of hydraulic oil changed in the described pumping master cylinder, described control gear changed the delivery pressure of described electro-hydraulic proportional reducing valve gradually, thereby improves described hydraulic pressure pump delivery gradually.
Preferably, from described concrete piston arrive the described second place through second scheduled time after, described control gear draws the conclusion that the flow direction of hydraulic oil in the described pumping master cylinder has changed.
The present invention also provides a kind of concrete mixer, comprises above-mentioned each described concrete pump reversing mechanism.
Concrete pump reversing mechanism provided by the present invention promptly can reduce the hydraulic pressure pump delivery that drives the pumping master cylinder after concrete piston is crossed near the primary importance of its stroke end, thereby has realized the pre-deceleration of concrete piston; After described concrete piston is crossed further the second place near its stroke end, can reduce described hydraulic pressure pump delivery once more, thereby the hydraulic pressure pump delivery is remained at low levels; Then, change the flow direction of hydraulic oil in the pumping master cylinder in the time of can lower at hydraulic pump discharge (even approaching zero delivery) by reversing arrangement, like this, can effectively alleviate the impact that commutation brought and the vibration of hydraulic oil in the pumping master cylinder, significantly improve the stability of concrete mixer working procedure.
The further above-mentioned primary importance of appropriate design, the second place and pre-amplitude of slowing down, thus can either realize the reduction of hydraulic pump discharge and concrete piston motion speed timely and effectively, can avoid the operation of concrete piston marked halt to occur again; That is, can realize the preferable coupling of concrete pumping speed and turn around time like this.
In the concrete pump reversing mechanism that the another kind of embodiment of the present invention is provided, after the commutation of hydraulic oil is finished in the pumping master cylinder, control gear can be controlled function by the slope and improve the hydraulic pressure pump delivery gradually, thereby can realize flexible the startup, has significantly alleviated to start and has impacted.
Description of drawings
Fig. 1 provides the structural representation of concrete pump reversing mechanism for a kind of embodiment of the present invention;
Fig. 2 provides the workflow diagram of concrete pump reversing mechanism for a kind of embodiment of the present invention;
Fig. 3 provides the schematic diagram of concrete pump reversing mechanism for a kind of embodiment of the present invention;
Fig. 4 provides the structural representation of concrete pump reversing mechanism for the another kind of embodiment of the present invention.
Embodiment
Core of the present invention provides a kind of concrete pump reversing mechanism, and the shock and vibration that commutation brought of hydraulic oil are less in its pumping master cylinder.Another core of the present invention provides a kind of concrete mixer that comprises above-mentioned concrete pump reversing mechanism.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 1 to Fig. 3, Fig. 1 provides the structural representation of concrete pump reversing mechanism for a kind of embodiment of the present invention; Fig. 2 provides the workflow diagram of concrete pump reversing mechanism for a kind of embodiment of the present invention; Fig. 3 provides the schematic diagram of concrete pump reversing mechanism for a kind of embodiment of the present invention.
In a kind of embodiment, concrete pump reversing mechanism provided by the present invention comprises piston position detecting device 1, piston position detecting device 1 is used for detecting concrete piston 7 and is carrying cylinder barrel 8 residing positions, and then judges whether concrete piston 7 arrives the precalculated position.
Piston position detecting device 1 specifically can comprise pressure reduction induction relay 11.
Can near predetermined primary importance, be provided with and detect a mouthful M1, and near the predetermined second place, be provided with and detect a mouthful M2, two control ends of pressure reduction induction relay 11 are linked to each other with a detection mouthful M2 with above-mentioned detection mouth M1 respectively, and pressure reduction induction relay 11 can send corresponding signal according to the pressure dependence that detects mouthful M1 and detection mouthful M2 like this.Above-mentioned primary importance is near the stroke end of concrete piston 7, and said second position is further near the stroke end of concrete piston 7.
Suppose the concrete piston 7 right-to-lefts motion that is positioned at the top among Fig. 3, at this moment, the concrete piston that is positioned at the below moves from left to right.Two concrete pistons are driven by a pumping master cylinder 6 respectively.
When the concrete piston 7 that is positioned at the top moved to position P1, the pressure that detects mouthful M1 and detection mouthful M2 equated that pressure reduction induction relay 11 does not have signal output.
When concrete piston 7 moves to position P2, when promptly just having crossed the primary importance that detects mouthful M1 place, the pressure that detects mouthful M2 is greater than the pressure that detects mouthful M1, pressure reduction induction relay 11 will output signal to control gear 2, control gear 2 will send corresponding instruction after receiving this signal, thereby the discharge capacity that reduces the oil hydraulic pump 5 that drives described pumping master cylinder 6 realizes the pre-deceleration of concrete piston 7 to predetermined value.
When concrete piston 7 moves to position P3, be that it is when just having crossed the second place that detects mouthful M2 place, the pressure that detects mouthful M2 equals to detect the pressure of mouthful M1 again, and the output signal of pressure reduction induction relay 11 is cut off, and control gear 2 reduces the discharge capacity of oil hydraulic pump 5 in view of the above once more.
Through reasonable time (first scheduled time) afterwards, the level that the discharge capacity of oil hydraulic pump 5 will be in will be lower (even approaching zero) at this moment can change the flow direction of hydraulic oil in the pumping master cylinder 6.
The flow direction of hydraulic oil can be changed by reversing arrangement 4 in the pumping master cylinder 6, and reversing arrangement 4 can be hydraulicchange-over valve and guide's hydraulic operated valve thereof.
Piston position detecting device 1 can also comprise pressure reduction Inductance valve 12, sends commutation signal by pressure reduction Inductance valve 12 to reversing arrangement 4.Particularly, can be provided with near the terminal point of concrete piston 7 strokes and detect a mouthful M3, two control ends of pressure reduction Inductance valve 12 are a joint detection mouth M3 and a detection mouthful M2 respectively.
When concrete piston 7 moved to detection mouthful M1 and detects between mouthful M2, the pressure that detects mouth M3 equaled to detect the pressure of mouthful M2; When concrete piston 7 moves to position P3, be that it is when just having crossed the second place that detects mouthful M2 place, the pressure that detects mouthful M3 is greater than the pressure that detects mouthful M2, so pressure reduction Inductance valve 12 is the delivery pressure signal, and guide's hydraulic operated valve of reversing arrangement 4 and hydraulicchange-over valve carry out commutation process in succession.
From sending commutation signal to reversing arrangement 4 actual generations commutation reaction time of existence, this reaction time and above-mentioned first scheduled time are approaching, and during this period of time the discharge capacity of oil hydraulic pump 5 can be reduced to predetermined level; Therefore, when concrete piston 7 is crossed the described second place, can send commutation signal, take place through commutation after first scheduled time is actual just substantially to reversing arrangement 4.
Concrete pump reversing mechanism provided by the present invention promptly can reduce the discharge capacity of oil hydraulic pump 5 after concrete piston 7 is crossed near the primary importance of its stroke end, thereby has realized the pre-deceleration of concrete piston 7; After concrete piston 7 is crossed further the second place near its stroke end, can reduce the discharge capacity of oil hydraulic pump 5 once more, thereby the discharge capacity of oil hydraulic pump 5 is remained at low levels; Then, can when oil hydraulic pump 5 discharge capacities lower (even approaching zero delivery), change the flow direction of hydraulic oil in the pumping master cylinder 6 by reversing arrangement 4, like this, can effectively alleviate the impact that commutation brought and the vibration of hydraulic oil in the pumping master cylinder 6, significantly improve the stability of concrete mixer working procedure.
Can improve the concrete pump reversing mechanism that above-mentioned embodiment provided.
For example, can be further the distance between the described primary importance and the described second place (promptly detecting mouthful M1 and the distance that detects between mouthful M2) scope be made as 90mm-100mm, and the spacing range of the described second place (promptly detecting mouthful position at M2 place) and the stroke end (promptly detecting the position at mouth M3 place) of concrete piston 7 is made as 45mm-55mm; Like this, can either timely and effectively the discharge capacity of oil hydraulic pump 5 and the motion speed of concrete piston 7 be reduced, can avoid concrete piston 7 operations marked halt to occur again, thereby realize concrete pumping speed and the preferable coupling of turn around time.
In order to obtain further technique effect, can also after crossing described primary importance, described concrete piston the discharge capacity of oil hydraulic pump 5 be reduced to the 25%-30% of former discharge capacity; Like this, concrete pumping speed and turn around time can obtain better coupling.
Concrete pump reversing mechanism provided by the present invention can also comprise electro-hydraulic proportional reducing valve 3, and control gear 2 is controlled its outlet pressure by the electrical signal of control input electro-hydraulic proportional reducing valve 3; The output discharge capacity of oil hydraulic pump 5 is with the outlet pressure linear change of electro-hydraulic proportional reducing valve 3.
When concrete piston 7 is crossed the described primary importance and the second place, control gear 2 is according to the electrical signal that changes input electro-hydraulic proportional reducing valve 3 from the piston position signal of piston position detecting device 1, thus the outlet pressure of double change electro-hydraulic proportional reducing valve 3; The output discharge capacity of oil hydraulic pump 5 is also incited somebody to action double being reduced thereupon.Like this, can change the discharge capacity of oil hydraulic pump 5 simply, reliably.
In addition, after the flow direction of hydraulic oil changed in pumping master cylinder 6, control gear 2 can change the electrical signal of input electro-hydraulic proportional reducing valve 3 gradually, thereby changed the delivery pressure of electro-hydraulic proportional reducing valve 3 gradually, and then realized that the flexibility of oil hydraulic pump 5 discharge capacities improves.Like this, control the discharge capacity that function improves oil hydraulic pump 5 gradually, can realize the flexible startup impact that starts, significantly alleviates by the slope.
Can set for second scheduled time, cross the described second place from concrete piston 7, through after described second scheduled time, can think that the commutation process of reversing arrangement 4 is finished, the flow direction of hydraulic oil changes in the pumping master cylinder 6; This time-control apparatus 2 can send the instruction that improves oil hydraulic pump 5 discharge capacities.Described second scheduled time specifically can obtain by actual measurement repeatedly.
Please refer to Fig. 4, Fig. 4 provides the structural representation of concrete pump reversing mechanism for the another kind of embodiment of the present invention.
In previous embodiment, the commutation signal of reversing arrangement 4 is sent by pressure reduction Inductance valve 12; Obviously, this signal can be sent by control gear 2 fully in theory.That is, after concrete piston 7 was crossed the described second place, control gear 2 obtained the piston position signal from piston position detecting device 1, thus to reversing arrangement 4 send change hydraulic oil flow in the pumping master cylinder 6 to signal.
In addition, the present invention also provides a kind of concrete mixer, comprises above-mentioned each described concrete pump reversing mechanism.The structure of described other each several parts of concrete mixer please refer to prior art, and this paper repeats no more.
More than concrete mixer provided by the present invention and concrete pump reversing mechanism thereof are described in detail.Used specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (10)
1. a concrete pump reversing mechanism is characterized in that, comprising:
Piston position detecting device is used for detecting concrete piston in the position of carrying cylinder barrel;
Control gear receives the position signal from described piston position detecting device, and sends instruction according to this position signal;
When described concrete piston arrived primary importance near its stroke end, described control gear reduced the hydraulic pressure pump delivery that drives the pumping master cylinder;
When described concrete piston arrived further the second place near its stroke end, described control gear reduced described hydraulic pressure pump delivery once more;
Through after first scheduled time, the flow direction of hydraulic oil changes by reversing arrangement in the pumping master cylinder again.
2. concrete pump reversing mechanism as claimed in claim 1 is characterized in that, when described concrete piston arrived described primary importance, described control gear was reduced to described hydraulic pressure pump delivery the 25%-30% of former discharge capacity.
3. as claim 1 or 2 described concrete pump reversing mechanisms, it is characterized in that, the spacing range of described primary importance, the second place is 90mm-100mm, and the spacing range of the stroke end of the described second place and described concrete piston is 45mm-55mm.
4. concrete pump reversing mechanism as claimed in claim 1, it is characterized in that, described piston position detecting device is the pressure reduction induction relay, described pressure reduction induction relay judges according to two pressure dependences that detect between the mouth being located at the described primary importance and the second place respectively whether described concrete piston crosses the described primary importance or the second place.
5. concrete pump reversing mechanism as claimed in claim 1 is characterized in that, when described concrete piston arrives the described second place, described control gear to described reversing arrangement send change hydraulic oil flow in the pumping master cylinder to signal.
6. concrete pump reversing mechanism as claimed in claim 1 is characterized in that, described concrete piston stroke end is provided with detects mouth, and this detection mouth links to each other with two control ends of pressure reduction Inductance valve respectively with the detection mouth that is in the described second place; When described concrete piston arrives the described second place, described pressure reduction Inductance valve to described reversing arrangement send change hydraulic oil flow in the pumping master cylinder to signal.
As claim 1,2 or claim 4 to 6 in each described concrete pump reversing mechanism, it is characterized in that, described control gear further comprises electro-hydraulic proportional reducing valve, and change the delivery pressure of described electro-hydraulic proportional reducing valve, and then change described hydraulic pressure pump delivery according to position signal from described piston position detecting device.
8. concrete pump reversing mechanism as claimed in claim 7, it is characterized in that, after the flow direction of hydraulic oil changed in the described pumping master cylinder, described control gear changed the delivery pressure of described electro-hydraulic proportional reducing valve gradually, thereby improves described hydraulic pressure pump delivery gradually.
9. concrete pump reversing mechanism as claimed in claim 8, it is characterized in that, from described concrete piston arrive the described second place through second scheduled time after, described control gear draws the conclusion that the flow direction of hydraulic oil in the described pumping master cylinder has changed.
10. a concrete mixer is characterized in that, comprises concrete pump reversing mechanism as claimed in claim 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910005621A CN101793247A (en) | 2009-01-20 | 2009-01-20 | Concrete pump truck and concrete delivery pump exchange system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910005621A CN101793247A (en) | 2009-01-20 | 2009-01-20 | Concrete pump truck and concrete delivery pump exchange system |
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| CN200910005621A Pending CN101793247A (en) | 2009-01-20 | 2009-01-20 | Concrete pump truck and concrete delivery pump exchange system |
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| CN102338134A (en) * | 2011-10-24 | 2012-02-01 | 中联重科股份有限公司 | Concrete pumping equipment and reversing control method for pumping oil cylinder of same |
| CN102392538A (en) * | 2011-09-16 | 2012-03-28 | 上海鸿得利重工股份有限公司 | Top power arm support concrete conveying pump truck |
| WO2012083645A1 (en) * | 2010-12-24 | 2012-06-28 | 湖南三一智能控制设备有限公司 | Control system for state of boom and concrete pump device applying the same |
| CN102777369A (en) * | 2011-05-13 | 2012-11-14 | 弗卢克公司 | Apparatus using electronically-controlled valves |
| CN103047337A (en) * | 2012-12-03 | 2013-04-17 | 中联重科股份有限公司 | Concrete spreading device and vibration elimination method, controller and device for arm frame thereof |
| CN103423139A (en) * | 2012-05-23 | 2013-12-04 | 中联重科股份有限公司 | Pumping mechanism, control method of pumping mechanism, and concrete pumping unit |
| WO2015081774A1 (en) * | 2013-12-04 | 2015-06-11 | 三一汽车制造有限公司 | Oil cylinder control system and control method, and pumping machine |
| CN104847642A (en) * | 2014-12-22 | 2015-08-19 | 北汽福田汽车股份有限公司 | Control method and control device for concrete pumping |
| CN106460878A (en) * | 2014-07-24 | 2017-02-22 | 谷歌公司 | Actuator limit controller |
| CN110173278A (en) * | 2019-04-29 | 2019-08-27 | 安百拓（南京）建筑矿山设备有限公司 | The pumping control method of wet-spraying machine |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012083645A1 (en) * | 2010-12-24 | 2012-06-28 | 湖南三一智能控制设备有限公司 | Control system for state of boom and concrete pump device applying the same |
| US9158308B2 (en) | 2011-05-13 | 2015-10-13 | Fluke Corporation | Apparatus using electronically-controlled valves |
| CN102777369A (en) * | 2011-05-13 | 2012-11-14 | 弗卢克公司 | Apparatus using electronically-controlled valves |
| US9394897B2 (en) | 2011-05-13 | 2016-07-19 | Fluke Corporation | Apparatus using electronically-controlled valves |
| CN102392538A (en) * | 2011-09-16 | 2012-03-28 | 上海鸿得利重工股份有限公司 | Top power arm support concrete conveying pump truck |
| CN102338134A (en) * | 2011-10-24 | 2012-02-01 | 中联重科股份有限公司 | Concrete pumping equipment and reversing control method for pumping oil cylinder of same |
| CN102338134B (en) * | 2011-10-24 | 2013-08-21 | 中联重科股份有限公司 | Concrete pumping equipment and reversing control method for pumping oil cylinder of same |
| CN103423139A (en) * | 2012-05-23 | 2013-12-04 | 中联重科股份有限公司 | Pumping mechanism, control method of pumping mechanism, and concrete pumping unit |
| CN103423139B (en) * | 2012-05-23 | 2016-04-27 | 中联重科股份有限公司 | Pumping mechanism and controlling method thereof and concrete pumping equipment |
| CN103047337A (en) * | 2012-12-03 | 2013-04-17 | 中联重科股份有限公司 | Concrete spreading device and vibration elimination method, controller and device for arm frame thereof |
| CN103047337B (en) * | 2012-12-03 | 2016-04-27 | 中联重科股份有限公司 | Method, controller and device that concrete distributing equipment and vibration of arm thereof suppress |
| WO2015081774A1 (en) * | 2013-12-04 | 2015-06-11 | 三一汽车制造有限公司 | Oil cylinder control system and control method, and pumping machine |
| CN106460878A (en) * | 2014-07-24 | 2017-02-22 | 谷歌公司 | Actuator limit controller |
| US10550860B2 (en) | 2014-07-24 | 2020-02-04 | Boston Dynamics, Inc. | Actuator limit controller |
| CN106460878B (en) * | 2014-07-24 | 2020-06-30 | 波士顿动力公司 | Actuator limit controller |
| US10851810B2 (en) | 2014-07-24 | 2020-12-01 | Boston Dynamics, Inc. | Actuator limit controller |
| CN104847642A (en) * | 2014-12-22 | 2015-08-19 | 北汽福田汽车股份有限公司 | Control method and control device for concrete pumping |
| CN110173278A (en) * | 2019-04-29 | 2019-08-27 | 安百拓（南京）建筑矿山设备有限公司 | The pumping control method of wet-spraying machine |
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Application publication date: 20100804 |