CN105275792A - Distribution device of concrete pumping device and concrete pumping device - Google Patents
Distribution device of concrete pumping device and concrete pumping device Download PDFInfo
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- CN105275792A CN105275792A CN201410350009.5A CN201410350009A CN105275792A CN 105275792 A CN105275792 A CN 105275792A CN 201410350009 A CN201410350009 A CN 201410350009A CN 105275792 A CN105275792 A CN 105275792A
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- dispensing device
- straight valve
- baffle
- swing axis
- concrete
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Abstract
The invention relates to the technical field of concrete pumping devices, and discloses a distribution device of a concrete pumping device and the concrete pumping device. A discharge pipe of the distribution device is only provided with two feed openings, and an oscillating shaft is connected to a hopper in a rotating mode. A direct valve is fixedly connected with the oscillating shaft; when the oscillating shaft oscillates to the set position on one side, the direct valve is communicated with a feed concrete pipe, and another discharge opening is blocked by a baffle. According to the scheme, the direct valve is used for enabling the feed concrete pipe and the discharge opening to be communicated, so that the suffered resistance is decreased when a piston of the feed concrete pipe pushes materials to the direct valve. Compared with a distribution device in the prior art, under the same material distribution condition, the pressure of a hydraulic system of the distribution device is low, the working reliability of all hydraulic elements is greatly improved, the service life is prolonged, and meanwhile the service life of vulnerable parts like a front discharge plate and the direct valve is prolonged.
Description
Technical field
The present invention relates to the technical field of the concrete pump set, refer more particularly to a kind of dispensing device and the concrete pump set of the concrete pump set.
Background technique
Pumping installations of the prior art has multiple, as pump truck, Vehicle loaded pump, drag the products such as pump, stirring cloth pump truck, wet-spraying machine, the structure of pumping installations of the prior art generally includes: the pumping mechanism holding the hopper of material, pumping hopper, the distributing mechanism be connected with pumping mechanism, and the stirring mechanism be connected with distributing mechanism, wherein, for distributing mechanism, " S valve " or " skirt valve " is mainly adopted to distribute as distribution member in prior art, concrete
Wherein, when adopting S valve, promoted the swing of S pipe valve by two single acting plunger oil cylinders, realize suction and the discharge of pumping cylinder.S pipe valve is played a supportive role by large and small end support ring.By adjusting nut, S pipe can be made to move axially, thus make the cutting ring be enclosed within S pipe valve compress eye slab, ensure the sealing in pumping procedure.
When adopting skirt valve, being promoted the swing of skirt valve by two single plunger cylinders, realizing suction and the discharge of pumping oil cylinder.Because skirt valve arrangement is different from S pipe valve structure, by contrast, during the pumping of skirt valve arrangement, aggregate flow resistance is less compared with S pipe valve structure, but suction comparatively S pipe valve structure difference.
The defect of prior art is, distributing mechanism of the prior art " S valve ", " skirt valve " exist the problems such as conveying aggregate resistance is large, hydraulic system pressure is high, complete machine rocks greatly, the easily damaged parts life-span is short, hydraulic element rate of fault is high.
Summary of the invention
The invention provides a kind of dispensing device of the concrete pump set, in order to solve in prior art the problem that there is the concrete pump set reversing impact.
The invention provides a kind of dispensing device of the concrete pump set, this pumping installations comprises hopper and to be communicated with hopper and for two feeding concrete pipes of pumping material, described dispensing device comprises: swing axis, drive unit, straight valve, discharge baffle and discharge nozzle, described discharge nozzle has a discharge port and two material feeding mouths, and described discharge port is connected with feeding tube; Wherein,
Described swing axis is rotatably connected on described hopper;
Described drive unit and described swing axis are rotationally connected and drive described swing axis to swing;
Described straight valve is positioned between described feeding concrete pipe and described discharge nozzle, and described straight valve is fixedly connected with described swing axis, and when described swing axis swings to the desired location of side, the axis of described straight valve overlaps with the line of centres of material feeding mouth with the mouth of pipe of the feeding concrete pipe of this side, and described straight valve is communicated with the feeding concrete pipe being positioned at this side;
When described straight valve and described two material feeding mouth alternate communication, described discharge baffle alternately blocks the material feeding mouth be not communicated with described straight valve.
In such scheme, feeding concrete pipe and discharge port is communicated with by adopting straight valve, thus make the piston of feeding concrete pipe when material is pushed into straight valve, the resistance be subject to reduces, material is sent in feeding tube by discharge nozzle by the material be pushed in straight valve, in whole working procedure, during pumping, aggregate flow resistance significantly reduces; And compared with dispensing device of the prior art, in identical cloth situation, distributing mechanism hydraulic system pressure provided by the invention is low, and each hydraulic element functional reliability significantly promotes, the life-span increases, and meanwhile, the easily damaged parts life-spans such as front reclaiming plate, straight valve increase.
Preferably, the setting position of described two material feeding mouths and the setting position one_to_one corresponding of described feeding concrete pipe.Thus making straight valve when being communicated with discharge port and feeding concrete pipe, straight valve, perpendicular to front reclaiming plate, facilitates the setting of whole device.
Preferably, also comprise front reclaiming plate, described front reclaiming plate is provided with the through hole matched with the material feeding mouth of described discharge nozzle, and described swing axis is located on described front reclaiming plate and described hopper.Make total more stable.
Preferably, described discharge baffle comprises corresponding with each material feeding mouth respectively setting and baffle plate for blocking material feeding mouth, described two baffle plates are symmetricly set on the both sides of described straight valve, and when described swing axis swings to the desired location of side, the feeding concrete pipe of this side and material feeding mouth are communicated with by described straight valve, and another material feeding mouth seals by one of them baffle plate.Blocking material feeding mouth is realized by adopting two baffle plates.
Preferably, described discharge baffle is fixedly connected with described swing axis or described straight valve.The swing of discharge baffle is driven by straight valve or swing axis.
Selectable, described two baffle plates are separately fixed on described swing axis.Baffle plate is Split type structure.
Selectable, described two baffle plates are structure as a whole, and described two baffle plates are fixed on described swing axis.Adopt the structure that two baffle plates are integrated.
Selectable, described two baffle plates connect into semi-moon shaped discharge baffle by joint, described semilune discharge baffle have the through hole for being sleeved on described straight valve.Baffle plate is facilitated to fix.
Preferably, described straight valve and described semilune discharge baffle are structure as a whole.Improve the validity between parts.
Preferably, described drive unit is for driving oil cylinder or driving oil hydraulic cylinder.Swing axis can be driven to swing by different drive units.
Preferably, described material feeding mouth is circular, square, rhombus or ellipse.Different shapes can be selected.
Present invention also offers a kind of the concrete pump set, this pumping installations comprises the dispensing device of the concrete pump set described in above-mentioned any one.
In such scheme, feeding concrete pipe and discharge port is communicated with by adopting straight valve, thus make the piston of feeding concrete pipe when material is pushed into straight valve, the resistance be subject to reduces, material is sent in feeding tube by discharge nozzle by the material be pushed in straight valve, in whole working procedure, during pumping, aggregate flow resistance significantly reduces; And compared with dispensing device of the prior art, in identical cloth situation, distributing mechanism hydraulic system pressure provided by the invention is low, and each hydraulic element functional reliability significantly promotes, the life-span increases, and meanwhile, the easily damaged parts life-spans such as front reclaiming plate, straight valve increase.
Accompanying drawing explanation
The structural drawing of the dispensing device of the concrete pump set that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the sectional view at E-E place in Fig. 1;
Fig. 3 is the structural representation in M-M direction in Fig. 2;
Fig. 4 is the structural representation in N-N direction in Fig. 2;
The structural representation of the discharge nozzle that Fig. 5 provides for the embodiment of the present invention;
The structural representation of a kind of discharge baffle that Fig. 6 provides for the embodiment of the present invention;
The structural representation of the another kind of discharge baffle that Fig. 7 provides for the embodiment of the present invention;
Fig. 8 for the embodiment of the present invention provide before the structural representation of reclaiming plate.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, Fig. 1, Fig. 2, Fig. 3 and Fig. 4 show the schematic diagram in the different amount direction of the dispensing device of the concrete pump set that the embodiment of the present invention provides.
Embodiments provide a kind of dispensing device of the concrete pump set, this pumping installations comprises hopper 10 and to be communicated with hopper 10 and for two feeding concrete pipes of pumping material, this pumping installations comprises hopper 10 and to be communicated with hopper 10 and for two feeding concrete pipes of pumping material, this dispensing device comprises: swing axis 70, drive unit, straight valve 20, discharge baffle 40 and discharge nozzle 50, this discharge nozzle 50 has a discharge port and two material feeding mouths, and discharge port is connected with feeding tube; Wherein,
Swing axis 70 is rotatably connected on hopper 10;
Drive unit and swing axis 70 are rotationally connected and drive swing axis 70 to swing;
Straight valve 20 is between feeding concrete pipe and discharge nozzle 50, and straight valve 20 is fixedly connected with swing axis 70, and when swing axis 70 swings to the desired location of side, straight valve 20 is communicated with the feeding concrete pipe being positioned at this side;
When described straight valve 20 is with described two material feeding mouth alternate communication, described discharge baffle 40 alternately blocks the material feeding mouth be not communicated with described straight valve 20.
Above-described embodiment is communicated with the material feeding mouth of feeding concrete pipe and discharge nozzle 50 by adopting straight valve 20, thus make the piston of feeding concrete pipe when material is pushed into straight valve 20, the resistance be subject to reduces, and material is sent in feeding tube by discharge nozzle 50 by the material be pushed in straight valve 20.
Concrete, the setting position of material feeding mouth and two feeding concrete pipes can one_to_one corresponding, also can not one_to_one corresponding, namely swing axis 70 axis can be parallel with straight valve 20 axis, also can become any angle, only need ensureing that straight valve 20 is when turning to desired location, the feeding concrete pipe and discharge port that are positioned at this side can be communicated with, preferably, the setting position one_to_one corresponding of two discharge ports and two feeding concrete pipes; Thus making straight valve 20 when being communicated with discharge port and feeding concrete pipe, straight valve 20, perpendicular to front reclaiming plate 30, facilitates the setting of whole device.
In addition, this dispensing device also comprises front reclaiming plate 30, and front reclaiming plate 30 is provided with the through hole 31 matched with the material feeding mouth of described discharge nozzle 50, and described swing axis 70 is located in described front reclaiming plate 30 with on described hopper 10.The structure of front reclaiming plate wherein as shown in Figure 8, front reclaiming plate 30 is provided with two through holes 31, wherein the structure of discharge nozzle as shown in Figure 5, its one end has two material feeding mouths, the other end has a mouth of pipe, when connecting, two material feeding mouths of discharge nozzle 50 are corresponding with two through holes 31 to be respectively tightly connected.
In whole working procedure, during pumping, aggregate flow resistance significantly reduces; And compared with dispensing device of the prior art, in identical cloth situation, the distributing mechanism hydraulic system pressure that the present embodiment provides is low, each hydraulic element functional reliability significantly promotes, life-span increases, and meanwhile, the easily damaged parts life-spans such as front reclaiming plate 30, straight valve 20 increase.
Conveniently to the understanding of the dispensing device working principle that the present embodiment provides, below in conjunction with accompanying drawing, the dispensing device that the present embodiment provides is described in detail.
Continue with reference to figure 1 ~ Fig. 4, this dispensing device comprises swing axis 70, drive unit, straight valve 20, front reclaiming plate 30, discharge baffle 40 and discharge nozzle 50, wherein, two through holes 31 on front reclaiming plate 30 are arranged with two feeding concrete pipes are corresponding respectively, swing axis 70 is located between front reclaiming plate 30 and hopper 10, straight valve 20 is fixed on swing axis 70, discharge baffle 40 is blocked in through hole, drive unit is two and drives oil cylinder 60 or drive oil hydraulic cylinder, below to drive oil cylinder 60, two both sides driving oil cylinder 60 to be separately positioned on swing axis 70, be respectively left driving oil cylinder and right driving oil cylinder, and two drive oil cylinder 60 to be all rotationally connected with swing axis 70, by driving telescopic band movable pendulum moving axis 70 left-right rotation of oil cylinder 60 piston rod thus realizing swinging.
When specific works, left driving oil cylinder and right driving oil cylinder move (when left driving oil cylinder stretches out simultaneously respectively, right driving oil cylinder retraction, two drive oil cylinder 60 alternating motion) time, drive is waved moving axis 70 and is swung around swing axis axis, thus by driving straight valve 20 to swing around swing axis axis with swing axis 70 rigid joint.When driving oil cylinder 60 work to one end limit position, a feeding concrete pipe (this feeding concrete pipe is filled aggregate) and a discharge port of front reclaiming plate 30 of straight valve 20 and hopper 10 form enclosed cavity, another through hole 31 of front reclaiming plate 30 blocks by another one baffle plate 41, the pumping oil cylinder being now filled the concrete pipe of aggregate moves ahead, promotion aggregate exports, owing to being straight valve 20, aggregate mobility is fine, pumping distributing mechanism resistance is very little, and by externally exporting with connecting of hopper 10 front end discharge nozzle 50.Meanwhile, hopper 10 directly communicates with another feeding concrete pipe of pumping mechanism, and now, the pumping oil cylinder of this feeding concrete pipe retreats, and the volume of concrete pipe increases, and forms negative pressure, is drawn into by the aggregate in hopper 10 in feeding concrete pipe.Drive oil cylinder 60 constantly to distinguish roll motion about distributing mechanism, straight valve 20 is just communicated with two feeding concrete pipes respectively, and is merged in feeding tube by discharge nozzle 50 by the material that two feeding concrete tube pumps go out, and forms aggregate and exports continuously.
Can be found out by foregoing description, in use, the flow resistance of pumping aggregate significantly reduces the dispensing device that the present embodiment provides; And compared with dispensing device of the prior art, in identical cloth situation, the distributing mechanism hydraulic system pressure that the present embodiment provides is low, each hydraulic element functional reliability significantly promotes, life-span increases, and meanwhile, the easily damaged parts life-spans such as front reclaiming plate 30, straight valve 20 increase.
In addition, for the matching relationship of discharge baffle 40 with front reclaiming plate 30, discharge baffle 40 can adopt different structures to realize constantly to be opened the through hole 31 relative with straight valve 20, closes the function of another one through hole 31 simultaneously.Such as discharge baffle 40 both can adopt Split type structure, can adopt integrative-structure again.
Wherein, described discharge baffle 40 comprises corresponding with each material feeding mouth respectively setting and baffle plate 41 for blocking material feeding mouth, described two baffle plates 41 are symmetricly set on the both sides of described straight valve 20, and when described swing axis 70 swings to the desired location of side, the feeding concrete pipe of this side and material feeding mouth are communicated with by described straight valve 20, and another material feeding mouth seals by one of them baffle plate 41.
Concrete, discharge baffle 40 comprises two baffle plates, 41, two baffle plates 41 and is all fixedly connected with swing axis 70, and two baffle plates 41 are respectively used to block two through holes 31.Adopt the structure of split to be convenient to the processing of baffle plate 41, baffle plate 41 can be processed with less mould, meanwhile, adopt Split type structure to be also convenient to the installation of discharge baffle 40.
Or as shown in Figure 6, two baffle plates 41 are structure as a whole, and two baffle plates 41 are fixed on swing axis 70.Baffle plate 41 is driven to swing by swing axis 70.
In addition, as shown in Figure 7, discharge baffle 40 can also adopt following structure: two baffle plates 41 connect into semi-moon shaped discharge baffle 40 by joint, semilune discharge baffle 40 has the through hole for being sleeved on straight valve 20, and any one baffle plate 41 is equal with the centre distance of two material feeding mouths with the centre distance of through hole.Semilune discharge baffle 40 is located on straight valve 20 by through hole, and is fixedly connected with straight valve 20, thus drives discharge baffle 40 to swing by straight valve 20, realizes the object of blocking material feeding mouth.Better, straight valve 20 is structure as a whole with semilune discharge baffle 40.Thus reduce assembly error, improve straight valve 20 when a connection feeding concrete pipe, discharge baffle 40 coordinates with material feeding mouth.
Material feeding mouth in above-described embodiment can be different shape, as: circular, square, rhombus or ellipse.And the orifice configuration of described straight valve 20 is identical with the shape of described material feeding mouth to meet coordinating of straight valve 20 and material feeding mouth.
The embodiment of the present invention additionally provides a kind of the concrete pump set, and this pumping installations comprises the dispensing device of the concrete pump set of above-mentioned any one.
In the above-described embodiments, feeding concrete pipe and material feeding mouth is communicated with by adopting straight valve 20, thus making the piston of feeding concrete pipe when material is pushed into straight valve 20, the resistance be subject to reduces, and material is sent in feeding tube by discharge nozzle 50 by the material be pushed in straight valve 20.In whole working procedure, during pumping, aggregate flow resistance significantly reduces; And compared with dispensing device of the prior art, in identical cloth situation, the distributing mechanism hydraulic system pressure that the present embodiment provides is low, each hydraulic element functional reliability significantly promotes, life-span increases, and meanwhile, the easily damaged parts life-spans such as front reclaiming plate 30, straight valve 20 increase.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (12)
1. the dispensing device of a concrete pump set, this pumping installations comprises hopper and to be communicated with hopper and for two feeding concrete pipes of pumping material, it is characterized in that, described dispensing device comprises: swing axis, drive unit, straight valve, discharge baffle and discharge nozzle, described discharge nozzle has a discharge port and two material feeding mouths, and described discharge port is connected with feeding tube; Wherein,
Described swing axis is rotatably connected on described hopper;
Described drive unit and described swing axis are rotationally connected and drive described swing axis to swing;
Described straight valve is positioned between described feeding concrete pipe and described discharge nozzle, and described straight valve is fixedly connected with described swing axis, and when described swing axis swings to the desired location of side, the axis of described straight valve overlaps with the line of centres of material feeding mouth with the mouth of pipe of the feeding concrete pipe of this side, and the two ends of described straight valve are communicated with the feeding concrete pipe and material feeding mouth that are positioned at this side respectively;
When described straight valve and described two material feeding mouth alternate communication, described discharge baffle alternately blocks the material feeding mouth be not communicated with described straight valve.
2. the dispensing device of the concrete pump set as claimed in claim 1, is characterized in that, the setting position of described two material feeding mouths and the setting position one_to_one corresponding of described feeding concrete pipe.
3. the dispensing device of the concrete pump set as claimed in claim 1, it is characterized in that, also comprise front reclaiming plate, described front reclaiming plate is provided with the through hole matched with the material feeding mouth of described discharge nozzle, and described swing axis is located on described front reclaiming plate and described hopper.
4. the dispensing device of the concrete pump set as claimed in claim 3, it is characterized in that, described discharge baffle comprises corresponding with each material feeding mouth respectively setting and baffle plate for blocking material feeding mouth, described two baffle plates are symmetricly set on the both sides of described straight valve, and when described swing axis swings to the desired location of side, the feeding concrete pipe of this side and material feeding mouth are communicated with by described straight valve, and another material feeding mouth seals by one of them baffle plate.
5. the dispensing device of the concrete pump set as claimed in claim 4, it is characterized in that, described discharge baffle is fixedly connected with described swing axis or described straight valve.
6. the dispensing device of the concrete pump set as claimed in claim 5, it is characterized in that, described two baffle plates are separately fixed on described swing axis.
7. the dispensing device of the concrete pump set as claimed in claim 5, it is characterized in that, described two baffle plates are structure as a whole, and described two baffle plates are fixed on described swing axis.
8. the dispensing device of the concrete pump set as claimed in claim 5, it is characterized in that, described two baffle plates connect into semi-moon shaped discharge baffle by joint, described semilune discharge baffle have the through hole for being sleeved on described straight valve.
9. the dispensing device of the concrete pump set as claimed in claim 8, it is characterized in that, described straight valve and described semilune discharge baffle are structure as a whole.
10. the dispensing device of the concrete pump set as claimed in claim 1, is characterized in that, described drive unit is for driving oil cylinder or driving oil hydraulic cylinder.
The dispensing device of 11. the concrete pump sets as described in any one of claim 1 ~ 10, is characterized in that, described material feeding mouth is circular, square, rhombus or ellipse.
12. a concrete pump set, it is characterized in that, comprise the dispensing device of the concrete pump set as described in any one of claim 1 ~ 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410350009.5A CN105275792B (en) | 2014-07-22 | 2014-07-22 | The distributor and the concrete pump set of a kind of the concrete pump set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410350009.5A CN105275792B (en) | 2014-07-22 | 2014-07-22 | The distributor and the concrete pump set of a kind of the concrete pump set |
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| CN105275792A true CN105275792A (en) | 2016-01-27 |
| CN105275792B CN105275792B (en) | 2017-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410350009.5A Active CN105275792B (en) | 2014-07-22 | 2014-07-22 | The distributor and the concrete pump set of a kind of the concrete pump set |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401895A (en) * | 2016-12-07 | 2017-02-15 | 王军 | Full-automatic multi-functional pumping machine |
| CN108265984A (en) * | 2018-04-16 | 2018-07-10 | 烟台盛利达工程技术有限公司 | The concrete pumping mechanism of closed no hopper |
| CN110067727A (en) * | 2019-04-25 | 2019-07-30 | 张家霞 | A kind of alternative expression small-size concrete pump |
| CN110258767A (en) * | 2019-04-24 | 2019-09-20 | 湖南睿弓机械科技有限公司 | Machines for mud clearage and its pumping system, distributor, pendulum valve module |
| WO2020019628A1 (en) * | 2018-07-24 | 2020-01-30 | 山东科技大学 | Pulse-free wet spraying machine |
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| US4343598A (en) * | 1980-03-14 | 1982-08-10 | Friedrich Wilh. Schwing Gmbh | Viscous material pump, particularly for concrete |
| JPS58190587A (en) * | 1982-04-30 | 1983-11-07 | Mitsubishi Heavy Ind Ltd | Line change-over device of concrete pump |
| CN102418693A (en) * | 2011-10-26 | 2012-04-18 | 三一重工股份有限公司 | Pumping machinery, pumping system, distribution valve for pumping system, and method for operating pumping system |
| CN202659965U (en) * | 2012-04-27 | 2013-01-09 | 三一重工股份有限公司 | Distributing valve, concrete delivery pipeline and concrete pipe pile drag pump |
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Patent Citations (5)
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| US3331332A (en) * | 1963-12-19 | 1967-07-18 | Wennberg Olov Carl Gustav | Piston pump for conveying concrete or other masses of similar consistency |
| US4343598A (en) * | 1980-03-14 | 1982-08-10 | Friedrich Wilh. Schwing Gmbh | Viscous material pump, particularly for concrete |
| JPS58190587A (en) * | 1982-04-30 | 1983-11-07 | Mitsubishi Heavy Ind Ltd | Line change-over device of concrete pump |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401895A (en) * | 2016-12-07 | 2017-02-15 | 王军 | Full-automatic multi-functional pumping machine |
| CN106401895B (en) * | 2016-12-07 | 2018-09-11 | 王军 | Full-automatic multi-functional pumping machine |
| CN108265984A (en) * | 2018-04-16 | 2018-07-10 | 烟台盛利达工程技术有限公司 | The concrete pumping mechanism of closed no hopper |
| WO2019201041A1 (en) * | 2018-04-16 | 2019-10-24 | 烟台盛利达工程技术有限公司 | Closed concrete pumping mechanism having no receiving hopper |
| WO2020019628A1 (en) * | 2018-07-24 | 2020-01-30 | 山东科技大学 | Pulse-free wet spraying machine |
| CN110258767A (en) * | 2019-04-24 | 2019-09-20 | 湖南睿弓机械科技有限公司 | Machines for mud clearage and its pumping system, distributor, pendulum valve module |
| CN110067727A (en) * | 2019-04-25 | 2019-07-30 | 张家霞 | A kind of alternative expression small-size concrete pump |
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|---|---|
| CN105275792B (en) | 2017-11-21 |
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