CN112517366A - Grit sieving mechanism for construction - Google Patents

Grit sieving mechanism for construction Download PDF

Info

Publication number
CN112517366A
CN112517366A CN202011288980.1A CN202011288980A CN112517366A CN 112517366 A CN112517366 A CN 112517366A CN 202011288980 A CN202011288980 A CN 202011288980A CN 112517366 A CN112517366 A CN 112517366A
Authority
CN
China
Prior art keywords
screening
pipe
box
screening case
screening box
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Withdrawn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
CN202011288980.1A
Other languages
Chinese (zh)
Inventor
金烨
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
Priority to CN202011288980.1A priority Critical patent/CN112517366A/en
Publication of CN112517366A publication Critical patent/CN112517366A/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/08Screens rotating within their own plane
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46Constructional details of screens in general; Cleaning or heating of screens
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50Cleaning
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/04Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool

Abstract

The invention discloses a sand and stone screening device for building construction, which comprises a screening box, wherein a feeding mechanism extending into the screening box is installed on the left side of the screening box, a plurality of pushing mechanisms are installed on the feeding mechanism, a rotating mechanism extending into the screening box is installed at the top of the screening box, a plurality of screening devices are installed on the rotating mechanism, a plurality of sliding plates are installed in the screening box, the sliding plates extend to the outside of the screening box, a discharging opening is formed in the screening box at the right end of each sliding plate, two stirring devices are installed above each screening device, a dust collection device is installed on the screening box, and the dust collection device comprises: the dust collector is installed at the top of the screening box and connected with the dust collecting pipe, a plurality of suction nozzles extending to the interior of the screening box are arranged on the dust collecting pipe, and a skip car is arranged on the right side of the screening box on the ground. The invention has the advantages of convenient screening, high screening efficiency, difficult blockage and convenient maintenance.

Description

Grit sieving mechanism for construction
Technical Field
The invention relates to the technical field of building construction, in particular to a sand and stone screening device for building construction.
Background
The building construction refers to production activities in the engineering construction implementation stage, is the construction process of various buildings, and also can be a process of changing various lines on a design drawing into a real object at a specified place. The method comprises foundation engineering construction, main structure construction, roofing engineering construction, decoration engineering construction and the like. The site of the construction operation is called a construction site, also called a worksite.
Sand, which refers to a loose mixture of sand and gravel. Geologically, the particle size is 0. 074-2 mm mineral or rock particles are called sand, and those with the particle size larger than 2mm are called gravel or breccia. Different gravels have larger structure difference, some gravels have uniform particle size and some gravels have different sizes, and the grinding roundness of the crumbs in some gravels is good and the edges and corners of the crumbs in some gravels are bright. Sand is a loose material, but its particles are generally hard and chemically stable in the surface environment. Sandstone generally has stronger weather resistance, and particularly, siliconized quartz sandstone has hardness higher than granite.
The sandstone is commonly used in the building construction process, but the quality of the sandstone can be influenced due to the fact that the sandstone contains more large-particle impurities, the sandstone needs to be screened before use, most of the existing sandstone screening devices are directly poured into a large amount of sandstone for screening, the screening devices are easy to block, and the screening efficiency is low.
Disclosure of Invention
The invention aims to provide a sand screening device for building construction, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a grit sieving mechanism for construction, includes the screening case, the side-mounting of screening case has the access door, the left side of screening case is installed and is extended to its inside feeding mechanism, the last a plurality of pushing equipment of installing of feeding mechanism, the top of screening case is installed and is extended to its inside rotary mechanism, the last a plurality of sieving mechanism of installing of rotary mechanism, a plurality of slides are installed to the screening incasement, the slide is 5-10 with the contained angle of horizontal direction, the slide extends to the outside of screening case, every a feed opening, every have all been seted up on the screening case to the right-hand member of slide two agitating unit are all installed to sieving mechanism's top, install dust extraction on the screening case, the right side of screening case is provided with the skip in subaerial.
As a further scheme of the invention: the feeding mechanism comprises: storage hopper, branch material pipe and conveyer pipe, the bottom of storage hopper links to each other with branch material pipe, the right side of dividing the material pipe is provided with a plurality of conveyer pipes, the conveyer pipe extends to the screening incasement, every a sieving mechanism is all installed to the right-hand member downside of conveyer pipe, the conveyer pipe is 20 with the contained angle of horizontal direction.
As a further scheme of the invention: the pushing equipment includes: the material distributing pipe comprises a switching block, a cylinder and a push plate, wherein the switching block is installed on the left side of the material distributing pipe, the cylinder is installed on the switching block and is arranged in parallel with the conveying pipe, and a telescopic rod and the push plate of the cylinder are arranged.
As a further scheme of the invention: the rotating mechanism includes: servo motor and transmission shaft, servo motor installs in the top of screening case, servo motor's output shaft extends to and links to each other with the transmission shaft in the screening case, the bottom of transmission shaft is passed through the bearing and is connected with the rotation of screening case.
As a further scheme of the invention: the screening device includes: box, screening net, hinge, half snap ring, bolt, connecting rod and gyro wheel, a screening net is installed to the bottom left and right sides symmetry of box, two the screening net rotates through hinge and box respectively and is connected, two the bottom of screening net has welded a half snap ring respectively, two half snap ring passes through the bolt fastening on the transmission shaft, a plurality of connecting rods of outside equipartition of box, every a gyro wheel is all installed to the tip of connecting rod, the gyro wheel extends to on the inner wall of screening case, the gyro wheel is through a plurality of balls and screening case roll connection, the ball is installed in the screening incasement.
As a further scheme of the invention: and a sliding plate is arranged below each box body.
As a further scheme of the invention: the toggle device comprises: the telescopic rod is connected with the mounting rod, and a plurality of triangular blades are welded at the bottom of the mounting rod.
As a further scheme of the invention: the dust suction device comprises: the dust collector is installed at the top of the screening box and connected with the dust collection pipe, and a plurality of suction nozzles extending to the interior of the screening box are arranged on the dust collection pipe.
Compared with the prior art, the invention has the beneficial effects that: this grit sieving mechanism for construction, during the use, add the grit in storage hopper and feed pipe, make partly grit flow naturally in a plurality of sieving mechanism through the effect of gravity, then drive the push pedal through the cylinder and promote the grit, make the grit abundant entering in a plurality of sieving mechanism, make in every sieving mechanism all can not lead to the jam because of gathering too many grit, then drive the transmission shaft through servo motor and rotate, drive the sieving mechanism through the transmission shaft rotation and rotate, sieve the grit through the screening net, in the time of sieving, stir the grit through a plurality of triangular blades on the installation pole, prevent its jam, the grit after the screening falls on the slide, by the slide landing in the skip again; during screening, the dust collector is started, and dust is absorbed through the suction nozzles, so that pollution is prevented; after the screening, open the access door, pull down the bolt on the half snap ring and make the screening net open, the large granule impurity that leaves over on the screening net can be discharged through the slide, is favorable to clearing up sieving mechanism. In conclusion, the invention has the advantages of convenient screening, high screening efficiency, difficult blockage and convenient maintenance.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a partial view at a in the structural schematic of the present invention.
Fig. 3 is a schematic perspective view of the screening apparatus of the present invention.
In the figure: 1-screening box, 101-feed opening, 102-ball, 103-access door, 2-feeding mechanism, 201-storage hopper, 202-material separating pipe, 203-conveying pipe, 3-pushing mechanism, 301-transfer block, 302-cylinder, 303-push plate, 4-rotating mechanism, 401-servo motor, 402-transmission shaft, 5-screening device, 501-box, 502-screening net, 503-hinge, 504-semi-snap ring, 505-bolt, 506-connecting rod, 507-roller, 6-toggle device, 601-telescopic rod, 602-mounting rod, 603-triangular blade, 7-dust-absorbing device, 701-dust-absorbing device, 702-dust-absorbing pipe, 703-suction nozzle, 8-slide plate, 9-skip, 10-support leg.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1 to 3, in an embodiment of the present invention, a sand screening device for building construction includes a screening box 1, an access door 103 is installed on a side surface of the screening box 1, a feeding mechanism 2 extending into the screening box 1 is installed on a left side of the screening box, and the feeding mechanism 2 includes: storage hopper 201, branch material pipe 202 and conveyer pipe 203, the bottom of storage hopper 201 links to each other with branch material pipe 202, the right side of dividing material pipe 202 is provided with a plurality of conveyer pipes 203, conveyer pipe 203 extends to in the screening case 1, every a sieving mechanism 5 is all installed to the right-hand member downside of conveyer pipe 203, conveyer pipe 203 is 20 with the contained angle of horizontal direction, install a plurality of pushing equipment 3 on the feeding mechanism 2, pushing equipment 3 includes: switching piece 301, cylinder 302 and push pedal 303, switching piece 301 is installed in the left side of branch material pipe 202, install cylinder 302 on the switching piece 301, cylinder 302 and conveyer pipe 203 parallel arrangement, the telescopic link and the push pedal 303 of cylinder 302 are added the grit in feeding mechanism 2, drive push pedal 303 through cylinder 302 and remove, promote the grit through push pedal 303 and enter into sieving mechanism 5 in, the rotary mechanism 4 that extends to its inside is installed at the top of screening case 1, rotary mechanism 4 includes: servo motor 401 and transmission shaft 402, servo motor 401 installs in the top of screening case 1, servo motor 401's output shaft extends to and links to each other with transmission shaft 402 in the screening case 1, the bottom of transmission shaft 402 is passed through the bearing and is rotated with screening case 1 and be connected, install a plurality of sieving mechanism 5 on the rotary mechanism 4, after the grit entered into sieving mechanism 5, drive sieving mechanism 5 by rotary mechanism 4 and rotate, sieve through sieving mechanism 5, sieving mechanism 5 includes: box 501, screening net 502, hinge 503, half snap ring 504, bolt 505, connecting rod 506 and gyro wheel 507, screening net 502 is installed to the bottom left and right sides symmetry of box 501, two screening net 502 rotates through hinge 503 and box 501 respectively to be connected, two screening net 502's bottom has welded respectively one half snap ring 504, two half snap ring 504 is fixed in on transmission shaft 402 through bolt 505, a plurality of connecting rods 506 of the outside equipartition of box 501, every gyro wheel 507 is all installed to connecting rod 506's tip, gyro wheel 507 extends to on the inner wall of screening case 1, gyro wheel 507 is through a plurality of balls 102 and screening case 1 roll connection, ball 102 is installed in screening case 1, install a plurality of slide 8 in the screening case 1, every slide 8 is all installed to the below of box 501, slide 8 is 5-10 with the contained angle of horizontal direction, slide 8 extends to the outside of screening case 1, every a feed opening 101, every have all been seted up on screening case 1 to slide 8's right-hand member two toggle device 6 are all installed to sieving mechanism 5's top, toggle device 6 includes: telescopic link 601, installation pole 602 and triangle blade 603, telescopic link 601 links to each other with installation pole 602, the bottom welding of installation pole 602 has a plurality of triangle blades 603, when sieving mechanism 5 rotated, stirs the grit of sieving mechanism 5 inside through triangle blade 603, prevents that sieving mechanism 5 from being blockked up, install dust extraction 7 on the screening case 1, the right side of screening case 1 is provided with skip 9 on the ground, screening case 1 links to each other with ground through a plurality of landing legs 10. During the use, add grit into storage hopper 201 and branch material pipe 202, make partly grit flow in a plurality of sieving mechanism 5 naturally through the effect of gravity, drive push pedal 303 through cylinder 302 again and promote the grit, make the grit abundant enter into a plurality of sieving mechanism 5, make each sieving mechanism 5 in not gathering too many grit, and lead to the jam, then drive transmission shaft 402 through servo motor 401 and rotate, drive sieving mechanism 5 through transmission shaft 402 rotation, sieve the grit through screening net 502, when sieving, stir the grit through a plurality of triangular blades 603 on the installation pole 602, prevent its jam, the grit after the screening falls on slide 8, slide by slide 8 landing to skip 9; after the screening, open access door 103, pull down bolt 505 on half snap ring 504 and make screening net 502 open, the large granule impurity that leaves over on screening net 502 can be discharged through slide 8, is favorable to clearing up sieving mechanism 5.
Example 2
Referring to fig. 1, in the embodiment of the present invention, the dust suction device 7 includes: the dust collector 701 is installed at the top of the screening box 1, the dust collector 701 is connected with the dust collecting pipe 702, the dust collecting pipe 702 is provided with a plurality of suction nozzles 703 extending into the screening box 1, the dust collector 701 is started during screening, and dust is absorbed through the suction nozzles 703 to prevent pollution.
This grit sieving mechanism for construction, during the use, add the grit into storage hopper 201 and branch material pipe 202, make partly grit flow naturally in a plurality of sieving mechanism 5 through the effect of gravity, drive push pedal 303 through cylinder 302 again and promote the grit, make the grit abundant enter into a plurality of sieving mechanism 5, make in every sieving mechanism 5 all can not lead to the jam because of gathering too many grit, then drive transmission shaft 402 through servo motor 401 and rotate, drive sieving mechanism 5 through transmission shaft 402 rotation, sieve the grit through screening net 502, while sieving, stir the grit through a plurality of triangle blades 603 on the installation pole 602, prevent its jam, the grit after the screening falls on slide 8, slide by slide 8 landing to in skip 9 again; during screening, the dust collector 701 is started, and dust is absorbed through the plurality of suction nozzles 703 to prevent pollution; after the screening, open access door 103, pull down bolt 505 on half snap ring 504 and make screening net 502 open, the large granule impurity that leaves over on screening net 502 can be discharged through slide 8, is favorable to clearing up sieving mechanism 5. In conclusion, the invention has the advantages of convenient screening, high screening efficiency, difficult blockage and convenient maintenance.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (8)

1. The utility model provides a grit sieving mechanism for construction, includes screening case (1), its characterized in that, access door (103) are installed to the side of screening case (1), feeding mechanism (2) that extend to its inside is installed in the left side of screening case (1), install a plurality of pushing equipment (3) on feeding mechanism (2), rotary mechanism (4) that extend to its inside are installed at the top of screening case (1), install a plurality of sieving mechanism (5) on rotary mechanism (4), install a plurality of slide (8) in screening case (1), slide (8) are 5-10 with the contained angle of horizontal direction, slide (8) extend to the outside of screening case (1), every slide (8) the right-hand member all seted up a feed opening (101) on screening case (1), every two toggle gear (6) are all installed to the top of sieving mechanism (5), the dust collection device (7) is installed on the screening box (1), and a skip car (9) is arranged on the right side of the screening box (1) on the ground.
2. The sand screening device for construction according to claim 1, wherein the feed mechanism (2) includes: storage hopper (201), branch material pipe (202) and conveyer pipe (203), the bottom of storage hopper (201) links to each other with branch material pipe (202), the right side of branch material pipe (202) is provided with a plurality of conveyer pipes (203), conveyer pipe (203) extend to in screening case (1), every sieving mechanism (5) are all installed to the right-hand member downside of conveyer pipe (203), conveyer pipe (203) are 20 with the contained angle of horizontal direction.
3. Gravel screening device for construction according to claim 2, characterized in that the pushing means (3) comprises: the material distributing pipe comprises a switching block (301), a cylinder (302) and a push plate (303), wherein the switching block (301) is installed on the left side of a material distributing pipe (202), the cylinder (302) is installed on the switching block (301), the cylinder (302) is arranged in parallel with a conveying pipe (203), and a telescopic rod of the cylinder (302) and the push plate (303) are arranged.
4. Gravel screening device for construction according to claim 1, characterized in that the rotation mechanism (4) comprises: servo motor (401) and transmission shaft (402), servo motor (401) are installed in the top of screening case (1), the output shaft of servo motor (401) extends to and links to each other with transmission shaft (402) in screening case (1), the bottom of transmission shaft (402) is passed through the bearing and is connected with screening case (1) rotation.
5. Sand screening apparatus for construction according to claim 4, wherein the screening apparatus (5) comprises: a box body (501), a screening net (502), a hinge (503), a semi-snap ring (504), a bolt (505), a connecting rod (506) and a roller (507), the left side and the right side of the bottom of the box body (501) are symmetrically provided with one screening net (502), the two screening nets (502) are respectively rotatably connected with the box body (501) through hinges (503), the bottoms of the two screening nets (502) are respectively welded with one semi-clamping ring (504), the two semi-clamping rings (504) are fixed on the transmission shaft (402) through bolts (505), a plurality of connecting rods (506) are uniformly distributed on the outer side of the box body (501), a roller (507) is installed at the end part of each connecting rod (506), the roller (507) extends to the inner wall of the screening box (1), the roller (507) is in rolling connection with the screening box (1) through a plurality of balls (102), and the balls (102) are installed in the screening box (1).
6. Sand screening apparatus for construction according to claim 5, wherein a slide plate (8) is installed below each of said cases (501).
7. Gravel screening device for building operations according to claim 1, characterized in that said toggle means (6) comprise: telescopic link (601), installation pole (602) and triangle blade (603), telescopic link (601) link to each other with installation pole (602), the bottom welding of installation pole (602) has a plurality of triangle blade (603).
8. Gravel screening device for construction according to claim 1, characterized in that the dust suction device (7) comprises: dust catcher (701), dust absorption pipe (702) and suction nozzle (703), install in the top of screening case (1) dust catcher (701), dust catcher (701) link to each other with dust absorption pipe (702), be provided with a plurality of suction nozzles (703) that extend to inside screening case (1) on dust absorption pipe (702).
CN202011288980.1A 2020-11-17 2020-11-17 Grit sieving mechanism for construction Withdrawn CN112517366A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011288980.1A CN112517366A (en) 2020-11-17 2020-11-17 Grit sieving mechanism for construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011288980.1A CN112517366A (en) 2020-11-17 2020-11-17 Grit sieving mechanism for construction

Publications (1)

Publication Number Publication Date
CN112517366A true CN112517366A (en) 2021-03-19

Family

ID=74980805

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011288980.1A Withdrawn CN112517366A (en) 2020-11-17 2020-11-17 Grit sieving mechanism for construction

Country Status (1)

Country Link
CN (1) CN112517366A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113578510A (en) * 2021-06-24 2021-11-02 陕西恒盛混凝土有限公司 Production system for machine-made sand concrete
CN114558784A (en) * 2022-02-22 2022-05-31 岳阳华铭混凝土有限公司 Concrete residual slurry recovery device for tank car

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113578510A (en) * 2021-06-24 2021-11-02 陕西恒盛混凝土有限公司 Production system for machine-made sand concrete
CN114558784A (en) * 2022-02-22 2022-05-31 岳阳华铭混凝土有限公司 Concrete residual slurry recovery device for tank car
CN114558784B (en) * 2022-02-22 2023-09-26 岳阳华铭混凝土有限公司 Concrete residual slurry recycling device for tank truck

Similar Documents

Publication Publication Date Title
CN108580256B (en) Building engineering is with screening sand device of taking brush roll
CN207204371U (en) Building waste category filter collection device
CN110152971B (en) Municipal construction is with preventing blockking up sand screening milling device
CN112517366A (en) Grit sieving mechanism for construction
CN110560235A (en) Building rubbish reducing mechanism with dustproof and metal recycle
CN209889762U (en) Dry-mixed mortar excess material recovery device
CN206838468U (en) A kind of chemical fertilizer screening machine
CN105689080B (en) LID changes fill construction material mixing station
CN112024398A (en) Building grit screening equipment
CN106031895A (en) Silver mine tailings ultra-fine activated fine powder and preparation technology thereof
CN214865184U (en) Sand screening device for civil and architectural engineering
CN207465524U (en) A kind of novel horizontal agitating device
CN214320870U (en) Civil engineering screening sand machine
CN115193531A (en) Solid waste's recovery processing device in road bridge construction
CN106391213B (en) The energy-saving and environment-friendly rolling stone roller of one kind makes sand machine
CN108543712A (en) Sand sieving machine scalping device
CN206253190U (en) A kind of rolling of energy-conserving and environment-protective is ground and makes sand machine
CN112474336B (en) Ore classifying and screening device
CN205760949U (en) A kind of organobentonite preparation facilities
CN212916114U (en) Building rubbish sorting equipment
CN108554769A (en) Sand sieving machine
CN111468222B (en) Building rubbish is with categorised sieving mechanism
CN113477399A (en) Method for preparing sand from sandy soil
CN113368943A (en) Construction waste crushing and screening comprehensive treatment device for building construction
CN211306892U (en) Building engineering mixing arrangement that gathers materials

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication
WW01 Invention patent application withdrawn after publication

Application publication date: 20210319