CN108621301A - A kind of concrete high-efficiency stirrer with cleaning function - Google Patents

A kind of concrete high-efficiency stirrer with cleaning function Download PDF

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Publication number
CN108621301A
CN108621301A CN201810256582.8A CN201810256582A CN108621301A CN 108621301 A CN108621301 A CN 108621301A CN 201810256582 A CN201810256582 A CN 201810256582A CN 108621301 A CN108621301 A CN 108621301A
Authority
CN
China
Prior art keywords
drive shaft
agitator
driven shaft
shaft
concrete
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201810256582.8A
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Chinese (zh)
Inventor
童振奎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CN108621301A publication Critical patent/CN108621301A/en
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28CPREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/18Mixing in containers to which motion is imparted to effect the mixing
    • B28C5/26Mixing in containers to which motion is imparted to effect the mixing rotating about a vertical or steeply inclined axis during the mixing, e.g. comprising a flat bottomplate rotating about a vertical axis, co-operating with blades or stirrers
    • B28C5/32Mixing in containers to which motion is imparted to effect the mixing rotating about a vertical or steeply inclined axis during the mixing, e.g. comprising a flat bottomplate rotating about a vertical axis, co-operating with blades or stirrers with driven stirrers
    • B28C5/325Mixing in containers to which motion is imparted to effect the mixing rotating about a vertical or steeply inclined axis during the mixing, e.g. comprising a flat bottomplate rotating about a vertical axis, co-operating with blades or stirrers with driven stirrers with several stirrer shafts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/10Maintenance of mixers
    • B01F35/12Maintenance of mixers using mechanical means
    • B01F35/123Maintenance of mixers using mechanical means using scrapers for cleaning mixers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/10Maintenance of mixers
    • B01F35/145Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means
    • B01F35/1452Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means using fluids
    • B01F35/1453Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means using fluids by means of jets of fluid, e.g. air
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/067Tub-grinders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28CPREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/0806Details; Accessories
    • B28C5/0831Drives or drive systems, e.g. toothed racks, winches
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28CPREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/04Supplying or proportioning the ingredients
    • B28C7/12Supplying or proportioning liquid ingredients
    • B28C7/126Supply means, e.g. nozzles

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Structural Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

The invention discloses a kind of concrete high-efficiency stirrers with cleaning function, it is welded and fixed vertically including bottom plate, on the bottom plate and support column is installed, drive shaft extends to inside agitator straight up, it is hollow structure inside drive shaft, is connected to inside horizontal tube and drive shaft;Connecting rod is installed with scraper plate vertically far from drive shaft one end;Flexible scraping article is abutted with agitator madial wall;The spout for being equipped with several between flexible scraping article and being connected to inside scraper plate;Several cutting blades are staggeredly equipped on the side wall of stirring frame, bottom plate is equipped with water tank, water tank is equipped with the delivery pump connected by pipe, the outlet end of delivery pump is communicated with delivery pipe, structure of the invention is ingenious, and stirring frame can be rotated around first driven shaft or second driven shaft, and then realizes that stirring frame is sufficiently stirred effect to agitator inner concrete, the cutting blade being staggered carries out cutting and crushing to the concrete of caking, improves the stirring efficiency of concrete.

Description

A kind of concrete high-efficiency stirrer with cleaning function
Technical field
The present invention relates to municipal construction field of mechanical technique, specifically a kind of concrete high-efficiency stirring with cleaning function Device.
Background technology
Municipal works refer to urban operating mechanism construction project.In China, urban operating mechanism refers to being built in metropolitan district, town (township) planning If being arranged in range, based on government responsibility and the voluntary various buildings for providing paid or free public product and service for resident Object, structures, equipment etc..The mating various public infrastructure developments of urban life belong to municipal works scope, than as usual The urban road seen, bridge, subway, for example, with the various pipelines that are closely related of life:Rainwater, sewage, upper water, middle water, electric power, Telecommunications, heating power, combustion gas etc., also square, the construction in gardens etc. belong to municipal works scope.Municipal works research and teaching Content includes engineering fluid mechanics, discharge water theory, technology and facility, municipal wastewater processing and reuse, sludge resource technology Etc..
During Municipal Engineering Construction, concrete is one of most common construction material, is needed before the use to mixed It coagulates native progress fully completely to stir, the mix uniformly effect of sandstone, cement in realization concrete;Current work progress institute Concrete central mix plant is bad to the mixed effect of concrete, and mixing efficiency is relatively low, is easy after being dried due to concrete solidifying Gu, it is therefore desirable to after the concrete discharging that stirring is completed, scrubbing in time for inner wall, existing coagulation are carried out to agitating device Native agitating device lacks self-stripping unit, and inner wall washing is not convenient enough.
Invention content
The purpose of the present invention is to provide a kind of concrete high-efficiency stirrers with cleaning function, to solve the above-mentioned back of the body The problem of being proposed in scape technology.
To achieve the above object, the present invention provides the following technical solutions:
A kind of concrete high-efficiency stirrer with cleaning function, including bottom plate are welded and fixed installation on the bottom plate vertically There is a support column, support column support is installed with agitator, and bottom plate is equipped with driving motor, coaxial on the output shaft of driving motor It is installed with drive shaft;The drive shaft extends to inside agitator straight up, is hollow structure, driving inside drive shaft It is arranged with horizontal tube at left and right sides of axis, is connected to inside horizontal tube and drive shaft;It is symmetrical horizontal solid at left and right sides of the drive shaft Dingan County is equipped with connecting rod, and connecting rod is installed with scraper plate vertically far from drive shaft one end;It is hollow structure inside the scraper plate, Scraper plate is equidistantly equipped with several flexible scraping articles close to agitator madial wall side, and flexible scraping article is abutted with agitator madial wall; The spout for being equipped with several between flexible scraping article and being connected to inside scraper plate;The horizontal tube is fixed on scraper plate far from drive shaft one end On, it is connected to inside horizontal tube and scraper plate;The agitator is equipped with fixed position-arresting disk, and annular stop is offered on fixed position-arresting disk Guide groove, is equipped with first driven shaft and second driven shaft in annular stop guide groove vertically, first driven shaft and second driven Axis is rotatably mounted in connecting rod, and the first driven shaft and second driven shaft hypomere are equipped with stirring frame, stirring frame Several cutting blades are staggeredly equipped on side wall, stirring frame bottom end is equipped with connecting shaft vertically, and horizontal tube is equipped with bearing block, even Spindle is rotatably mounted on bearing block;The agitator upper end is equipped with ring gear, and first driven shaft upper end is coaxially fixedly mounted The first gear of connection is engaged with ring gear, the second tooth that connection is engaged with ring gear is coaxially fixedly mounted in second driven shaft upper end Wheel;The bottom plate is equipped with water tank, and water tank is equipped with the delivery pump connected by pipe, and the outlet end of delivery pump is communicated with conveying Pipe, delivery pipe are extend into inside drive shaft;The stirring bottom of the barrel is opened up vertically there are two about driving axisymmetric discharge nozzle, Outlet valve is installed, agitator upper side wall offers feed pipe on discharge nozzle.
Scheme as an improvement of the present invention:The first driven shaft and second driven shaft are about shaft center axis It is symmetrical arranged.
Scheme as an improvement of the present invention:The delivery pipe is equipped with seal washer with driving shaft connection place.
Scheme as an improvement of the present invention:The flexibility scraping article is made using rubber material.
Scheme as an improvement of the present invention:The stirring frame is between connecting rod and horizontal tube.
Scheme as an improvement of the present invention:The quantity of the feed pipe is two and is symmetrical arranged about drive shaft.
Compared with prior art, the beneficial effects of the invention are as follows:
Structure of the invention is ingenious, reasonable design, and the stirring frame for being stirred to concrete not only can be under the drive of connecting rod It is rotated around drive shaft, while stirring frame can be rotated around first driven shaft or second driven shaft, Jin Ershi Existing stirring frame is sufficiently stirred effect to agitator inner concrete, and the cutting blade being staggered cuts the concrete of caking It cuts broken, improves the stirring efficiency of concrete;Scraper plate drives flexible scraping article to scrape the coagulation adhered on agitator inner wall It removes, avoids the waste of concrete, while improving the mixing effect of concrete;Clean water, clean water can be passed through in drive shaft The spout that can pass through on scraper plate is washed away to agitator inner wall, and flexible scraping article scrapes agitator inner wall, realizes and stirs The good self-cleaning effect of barrel inner wall is mixed, it need not be simple to operate by exterior washings tool.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the structural schematic diagram of annular limition orientation slot in the present invention.
Fig. 3 is structural schematic diagram of the middle scraper of the present invention close to agitator inner wall side.
Fig. 4 is the attachment structure schematic diagram of ring gear and agitator in the present invention.
In figure:1- bottom plates, 2- water tanks, 3- delivery pumps, 4- bearing blocks, 5- delivery pipes, 6- scraper plates, 7- driving first gear, 8- first driven shafts, 9- drive shafts, 10- second gears, 11- second driven shafts, 12- ring gears, 13- fix position-arresting disk, 14- into Expects pipe, 15- connecting rods, 16- cutting blades, 17- agitators, 18- connecting shafts, 19- horizontal tubes, 20- support columns, 21- outlet valves, 22- discharge nozzles, 23- driving motors, 24- stirring frames, 25- flexibilities scraping article, 26- spouts, 27- annular stop guide grooves.
Specific implementation mode
The technical solution of this patent is described in more detail With reference to embodiment:
Please refer to Fig.1-4, a kind of concrete high-efficiency stirrer with cleaning function, including bottom plate 1 erects on the bottom plate 1 Straight be welded and fixed is equipped with support column 20, and the support of support column 20 is installed with agitator 17, and bottom plate 1 is equipped with driving motor 23, drive shaft 9 is coaxially installed on the output shaft of driving motor 23;The drive shaft 9 extends to agitator straight up Inside 17,9 inside of drive shaft is hollow structure, and 9 left and right sides of drive shaft is arranged with horizontal tube 19, horizontal tube 19 and drive shaft 9 inside connections;The symmetrical level in 9 left and right sides of the drive shaft is installed with connecting rod 15, and connecting rod 15 is far from drive shaft 9 one End is installed with scraper plate 6 vertically;6 inside of the scraper plate is hollow structure, and scraper plate 6 is between 17 madial wall side of agitator etc. Away from equipped with several flexible scraping articles 25, flexible scraping article 25 is abutted with 17 madial wall of agitator;It is equipped between flexible scraping article 25 several A spout 26 being connected to 6 inside of scraper plate;The horizontal tube 19 is fixed on far from 9 one end of drive shaft on scraper plate 6, horizontal tube 19 with 6 inside connection of scraper plate;The agitator 17 is equipped with fixed position-arresting disk 13, and annular stop guiding is offered on fixed position-arresting disk 13 Slot 27 is equipped with first driven shaft 8 and second driven shaft 11, first driven shaft 8 and second in annular stop guide groove 27 vertically Driven shaft 11 is rotatably mounted in connecting rod 15, and the first driven shaft 8 and 11 hypomere of second driven shaft are equipped with stirring Frame 24 is staggeredly equipped with several cutting blades 16 on the side wall of stirring frame 24, and 24 bottom end of stirring frame is equipped with connecting shaft 18 vertically, Horizontal tube 19 is equipped with bearing block 4, and connecting shaft 18 is rotatably mounted on bearing block 4;17 upper end of the agitator is equipped with internal tooth Circle 12, the first gear 7 for engaging and connecting with ring gear 12 is coaxially fixedly mounted in 8 upper end of first driven shaft, in second driven shaft 11 End is coaxial to be fixedly mounted the second gear 10 that connection is engaged with ring gear 12;The bottom plate 1 is equipped with water tank 2, and water tank 2 is equipped with The delivery pump 3 connected by pipe, the outlet end of delivery pump 3 are communicated with delivery pipe 5, and delivery pipe 5 is extend into inside drive shaft 9; 17 bottom of the agitator is opened up vertically there are two about 9 symmetrical discharge nozzle 22 of drive shaft, and discharging is equipped on discharge nozzle 22 Valve 21,17 upper side wall of agitator offer feed pipe 14.
The present invention operation principle and application method be:
When original state, clean water is injected into water tank 2;It will be into use, being injected into agitator 17 by feed pipe 14 The concrete of row stirring starts driving motor 23 and drive shaft 9 is driven to rotate, and drive shaft 9 passes through 19 band of connecting rod 15 and horizontal tube Dynamic first driven shaft 8 and second driven shaft 11 are rotated in annular stop guide groove 27,11 band of first driven shaft 8 and second driven shaft Dynamic stirring frame 24 is rotated, and stirring frame 24 is rotated around 9 center line of drive shaft, and is revolved to the concrete in agitator 17 Turn stirring;At the same time, the first gear 7 in first driven shaft 8 is rotated around ring gear 12, and first driven shaft 8 is with first The rotation of gear 7 and rotate, the second gear 10 in second driven shaft 11 around ring gear 12 rotate, second driven shaft 11 with The rotation of second gear 10 and rotate, stirring frame 24 is rotated around first driven shaft 8 or second driven shaft 11 at this time, and then is driven The cutting blade 16 being staggered rotates, and can not only be stirred to concrete, while the concrete block of caking being cut It is broken, improve the efficiency of stirring;Connecting rod 15 and horizontal tube 19 drive scraper plate 6 to rotate, and scraper plate 6 drives flexible scraping article 25 to stirring It mixes the coagulation adhered on 17 inner wall of bucket to be struck off, avoids the waste of concrete, while improving the mixing effect of concrete; After the completion of concrete stirring, outlet valve 21 is opened, agitator 17 is discharged by discharge nozzle 22 in concrete.
After concrete is excluded from agitator 17, by following operation to being cleaned inside agitator 17:Start conveying Pump 3, the clean water in water tank 2 is pumped by delivery pipe 5 inside drive shaft 9 by delivery pump 3, and clean water passes through drive shaft 9, water Flat pipe 19 enters inside scraper plate 6, and clean water is sprayed eventually by the spout 26 being arranged on scraper plate 6 to 17 inner wall of agitator It rinses, under the driving of driving motor 23, scraper plate 6 drives flexible scraping article 25 to scrape 17 inner wall of agitator, realizes and stirs The good self-cleaning effect of 17 inner wall of bucket is mixed, need not be by exterior washings tool, cleaning performance is good, simple to operate.Together When, during concrete stirs required water can also be stirred to addition inside agitator 17 by delivery pipe 5.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power Profit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiment being appreciated that.

Claims (6)

1. a kind of concrete high-efficiency stirrer with cleaning function, including bottom plate(1), which is characterized in that the bottom plate(1) On be welded and fixed vertically support column be installed(20), support column(20)Support is installed with agitator(17), bottom plate(1)On set There is driving motor(23), driving motor(23)Output shaft on be coaxially installed with drive shaft(9);The drive shaft(9)It is perpendicular Directly extend upwardly to agitator(17)Inside, drive shaft(9)Inside is hollow structure, drive shaft(9)The left and right sides is arranged with Horizontal tube(19), horizontal tube(19)With drive shaft(9)Inside connection;The drive shaft(9)The symmetrical horizontal fixed peace in the left and right sides Equipped with connecting rod(15), connecting rod(15)Far from drive shaft(9)One end is installed with scraper plate vertically(6);The scraper plate(6)It is interior Portion is hollow structure, scraper plate(6)Close to agitator(17)Madial wall side is equidistantly equipped with several flexible scraping articles(25), flexible Scraping article(25)With agitator(17)Madial wall abuts;Flexible scraping article(25)Between be equipped with several and scraper plate(6)Inside connection Spout(26);The horizontal tube(19)Far from drive shaft(9)One end is fixed on scraper plate(6)On, horizontal tube(19)With scraper plate(6)It is interior Portion is connected to;The agitator(17)It is equipped with fixed position-arresting disk(13), fixed position-arresting disk(13)On offer annular stop guiding Slot(27), annular stop guide groove(27)It is interior to be equipped with first driven shaft vertically(8)And second driven shaft(11), first driven shaft (8)And second driven shaft(11)It is rotatably mounted on connecting rod(15)On, the first driven shaft(8)And second driven shaft (11)Hypomere is equipped with stirring frame(24), stirring frame(24)Side wall on be staggeredly equipped with several cutting blades(16), stirring Frame(24)Bottom end is equipped with connecting shaft vertically(18), horizontal tube(19)It is equipped with bearing block(4), connecting shaft(18)It is rotatably mounted on Bearing block(4)On;The agitator(17)Upper end is equipped with ring gear(12), first driven shaft(8)Upper end coaxially be fixedly mounted with Ring gear(12)Engage the first gear of connection(7), second driven shaft(11)Upper end is coaxially fixedly mounted and ring gear(12)It nibbles Close the second gear of connection(10);The bottom plate(1)It is equipped with water tank(2), water tank(2)It is equipped with the conveying connected by pipe Pump(3), delivery pump(3)Outlet end be communicated with delivery pipe(5), delivery pipe(5)It extend into drive shaft(9)It is internal;The stirring Bucket(17)Bottom is opened up vertically there are two about drive shaft(9)Symmetrical discharge nozzle(22), discharge nozzle(22)On discharging is installed Valve(21), agitator(17)Upper side wall offers feed pipe(14).
2. the concrete high-efficiency stirrer according to claim 1 with cleaning function, which is characterized in that described first Driven shaft(8)And second driven shaft(11)About drive shaft(9)Central axis is symmetrical arranged.
3. the concrete high-efficiency stirrer according to claim 1 with cleaning function, which is characterized in that the conveying Pipe(5)With drive shaft(9)Junction is equipped with seal washer.
4. the concrete high-efficiency stirrer according to claim 1 with cleaning function, which is characterized in that the flexibility Scraping article(25)It is made using rubber material.
5. the concrete high-efficiency stirrer according to claim 1 with cleaning function, which is characterized in that the stirring Frame(24)Positioned at connecting rod(15)And horizontal tube(19)Between.
6. the concrete high-efficiency stirrer according to claim 1 with cleaning function, which is characterized in that the charging Pipe(14)Quantity be two and about drive shaft(9)It is symmetrical arranged.
CN201810256582.8A 2017-09-14 2018-03-27 A kind of concrete high-efficiency stirrer with cleaning function Withdrawn CN108621301A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710825307 2017-09-14
CN2017108253079 2017-09-14

Publications (1)

Publication Number Publication Date
CN108621301A true CN108621301A (en) 2018-10-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810256582.8A Withdrawn CN108621301A (en) 2017-09-14 2018-03-27 A kind of concrete high-efficiency stirrer with cleaning function

Country Status (1)

Country Link
CN (1) CN108621301A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110450285A (en) * 2019-08-21 2019-11-15 北京城建九秋实混凝土有限公司 A kind of concrete mixing tank with cleaning function
CN112405848A (en) * 2020-11-17 2021-02-26 源丰建设有限公司 A concrete mixing plant

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110450285A (en) * 2019-08-21 2019-11-15 北京城建九秋实混凝土有限公司 A kind of concrete mixing tank with cleaning function
CN110450285B (en) * 2019-08-21 2024-05-31 北京城建九秋实混凝土有限公司 Concrete mixing drum with cleaning function
CN112405848A (en) * 2020-11-17 2021-02-26 源丰建设有限公司 A concrete mixing plant
CN112405848B (en) * 2020-11-17 2021-12-10 源丰建设有限公司 Concrete mixing equipment

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Application publication date: 20181009

WW01 Invention patent application withdrawn after publication