CN110593038B - Reinforced cement hollow brick, forming device and forming method - Google Patents
Reinforced cement hollow brick, forming device and forming method Download PDFInfo
- Publication number
- CN110593038B CN110593038B CN201910898456.7A CN201910898456A CN110593038B CN 110593038 B CN110593038 B CN 110593038B CN 201910898456 A CN201910898456 A CN 201910898456A CN 110593038 B CN110593038 B CN 110593038B
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- frame
- auxiliary
- hollow brick
- supporting
- brick
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/04—Pavings made of prefabricated single units made of bricks
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/14—Preformed blocks or slabs for forming essentially continuous surfaces; Arrangements thereof
Abstract
The invention relates to a reinforced cement hollow brick, a forming device and a forming method. The reinforced concrete hollow brick can solve the following problems in the using and manufacturing processes of the existing reinforced concrete hollow brick, the existing reinforced concrete hollow brick is directly spliced on the ground when in use, the adjacent concrete hollow bricks are connected in a simple extrusion mode, gaps among the concrete hollow bricks can be enlarged after being extruded by gravity or used for a long time, and the pavement smoothness paved by the concrete hollow bricks is easy to damage; after traditional cement hollow brick system pours into the thick liquids into the mould into, need wait for after the natural setting can take out cement hollow brick, need prepare a large amount of moulds during batch production, increased cement hollow brick's manufacturing cost.
Description
Technical Field
The invention relates to the technical field of cement hollow brick preparation, in particular to a reinforced cement hollow brick, a forming device and a forming method.
Background
The cement hollow brick is mainly used for a non-bearing structure, wherein the hexagonal cement hollow brick is mainly used for a river slope surface, landscape garden pavement laying, the tightness degree of the connection of the cement hollow brick during laying plays a vital role in the slope surface paved by the cement hollow brick and the service life of the pavement, and the production efficiency and the production cost of the cement hollow brick also influence the use of the cement hollow brick.
However, the following problems exist in the use and manufacturing processes of the existing reinforced cement hollow bricks, the existing cement hollow bricks are directly spliced on the ground when in use, the adjacent cement hollow bricks are connected in a simple extrusion mode, gaps among the cement hollow bricks can be enlarged after being extruded by gravity or used for a long time, and the pavement flatness paved by the cement hollow bricks is easy to damage; after traditional cement hollow brick system pours into the thick liquids into the mould into, need wait for after the natural setting can take out cement hollow brick, need prepare a large amount of moulds during batch production, increased cement hollow brick's manufacturing cost.
For the technical problems existing in the using and manufacturing processes of the cement hollow brick, a person skilled in the relevant technical field has made an adapted improvement after research, for example, patent No. 2015208267970, a hexagonal cement hollow brick vibration stripper, which can increase the stripping speed and ensure the completeness of the mold and the finished product, however, there is a need to solve the above mentioned problems existing in the using and manufacturing processes of the cement hollow brick.
Disclosure of Invention
In order to solve the problems, the invention provides a reinforced cement hollow brick, a forming device and a forming method, which can solve the problems existing in the use and manufacturing processes of the reinforced cement hollow brick.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose: a reinforced cement hollow brick comprises a brick body, wherein the brick body is of a hexagonal structure, the middle part of the brick body is of a hollow circular structure, and the upper end surface and the lower end surface of the brick body are provided with anti-skid lines;
the side walls of the brick body along the circumferential direction are provided with clamping blocks and clamping grooves matched with the clamping blocks for use;
the clamping block comprises a blocking block arranged on the side wall of the brick body, the lower end of the blocking block is provided with a sliding block, and the width of the sliding block is of a trapezoidal structure with a decreasing structure from inside to outside;
the upper end of the clamping groove is of a rectangular structure clamped by the blocking block in a matching mode, and the lower side of the clamping groove is of a trapezoidal structure connected by the sliding block in a matching mode;
the reinforced cement hollow brick is manufactured by using a special forming device, the forming device comprises an installation base frame, a driving device is arranged in the middle of the installation base frame, supporting molds are uniformly arranged at the upper end of the driving device, a pressing cylinder is arranged on the inner wall of the upper end face of the installation base frame, the top end of the pressing cylinder is installed on a pressing plate through a flange, sealing molds matched with the supporting molds are uniformly arranged on the lower end face of the pressing plate, and a heating blanket is arranged at the front end of the installation base frame;
the supporting mold comprises a supporting frame, the supporting frame is of a hexagonal structure with a closed bottom, a forming groove for pouring the clamping block is formed in the inner wall of the supporting frame along the circumferential direction of the supporting frame, a telescopic hole is formed in the middle of the lower end of the supporting frame, and an auxiliary mechanism is arranged in the middle of the supporting frame;
the sealing mold comprises a sealing frame arranged on the pressing plate, a pouring gate is arranged on the sealing frame, a pressing column is arranged in the middle of the sealing frame, a forming block for pouring the clamping groove is arranged on the sealing frame, a heating cavity is arranged in the sealing frame, and an electric heating tube is arranged in the heating cavity;
the driving device comprises a motor which is installed on the installation base frame through a motor base, an output shaft of the motor is connected with the right end of the rotating cylinder through a coupler, the left end of the rotating cylinder is connected onto the annular sliding groove, the annular sliding groove is fixed on the installation base frame, a transmission column is fixed at the left end of the installation base frame, the right end of the transmission column is installed on the rotating cylinder through a bearing, the rotating cylinder is evenly provided with through holes, and the transmission column is provided with through holes matched with the through holes for through hole movement.
The auxiliary mechanism comprises an auxiliary ring arranged in the middle of the supporting frame, auxiliary grooves are uniformly formed in the auxiliary ring along the circumferential direction of the auxiliary ring, an auxiliary plate is arranged in each auxiliary groove in a sliding mode, the outer side of the auxiliary plate is connected to the supporting frame in a sliding mode, an extrusion rod is arranged at the lower end of each auxiliary plate, a spring is arranged between each auxiliary plate and the corresponding auxiliary ring, and the extrusion rod sequentially penetrates through the telescopic holes and the through holes from top to bottom.
The pressing column is of a hollow structure, an electric heating tube in a spiral structure is arranged in the pressing column, and heat conducting blocks matched with the auxiliary grooves and used are evenly arranged on the pressing column.
And the sealing frame and the auxiliary plate are uniformly used for pouring anti-skid convex strips with anti-skid lines.
A transmission frame is arranged in the through hole in a sliding fit mode, a return spring is connected between the transmission frame and the transmission column, and the transmission frame is abutted against an extrusion rod.
The molding method of the reinforced cement hollow brick mainly comprises the following processing and molding steps;
step one, performing die assembly operation, namely pressing the working of a cylinder to control the butt joint of a sealing die and a supporting die;
pouring slurry, namely pouring the slurry into the butted mold through a pouring gate, electrifying an electric heating pipe to start heating, quickly solidifying the slurry in the mold, and controlling the sealed mold to reset;
and step three, circularly rotating, wherein the motor drives the rotating cylinder to rotate, controlling the support mould of the slurry after pouring to move to the position right below the mounting base frame, and extruding the solidified and molded reinforced cement hollow brick from the support mould.
The invention has the beneficial effects that:
1. the reinforced concrete hollow brick can solve the following problems in the using and manufacturing processes of the existing reinforced concrete hollow brick, the existing reinforced concrete hollow brick is directly spliced on the ground when in use, the adjacent concrete hollow bricks are connected in a simple extrusion mode, gaps among the concrete hollow bricks can be enlarged after being extruded by gravity or used for a long time, and the pavement smoothness paved by the concrete hollow bricks is easy to damage; after traditional cement hollow brick system pours into the thick liquids into the mould into, need wait for after the natural setting can take out cement hollow brick, need prepare a large amount of moulds during batch production, increased cement hollow brick's manufacturing cost.
2. The reinforced cement hollow brick designed by the invention can be locked between two adjacent brick bodies through the matching between the clamping block and the clamping groove in use, so that the laid brick bodies can not slide after being used for a long time, the connection precision between the brick bodies is improved, and the service life of the cement hollow brick laid pavement can be prolonged.
3. The forming device designed in the invention can improve the solidification speed of the slurry in the mould through the heating pipe after the cement hollow brick is formed and poured, and the heating blanket can be controlled to continuously heat the slurry in the mould in the rotating process of the mould, so that the slurry on the surface of the cement hollow brick is solidified.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic view of the structure of a molding apparatus of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a schematic structural view of the support mold of the present invention;
FIG. 4 is a schematic view of the sealing mold of the present invention;
FIG. 5 is a cross-sectional view of the sealing die of the present invention;
FIG. 6 is a schematic view of a reinforced cement air brick of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1 to 6, a reinforced cement hollow brick mainly comprises a brick body a, wherein the brick body a is of a hexagonal structure, the middle part of the brick body a is of a hollow circular structure, and the upper end surface and the lower end surface of the brick body a are provided with anti-skid lines;
the side wall of the brick body A along the circumferential direction is provided with a clamping block and a clamping groove matched with the clamping block; the clamping block comprises a blocking block arranged on the side wall of the brick body A, the lower end of the blocking block is provided with a sliding block, and the width of the sliding block is of a trapezoidal structure with a decreasing structure from inside to outside; the upper end in joint groove is the rectangle structure of cooperation jam block chucking, and the downside in joint groove sets up the trapezium structure that cooperation sliding block is connected. The brick body A that links to each other during the installation is fixed through joint piece and joint groove, has improved the fastness of connecting between the brick body.
The reinforced cement hollow brick is manufactured by using a special forming device, the forming device comprises an installation base frame 1, a driving device 2 is arranged in the middle of the installation base frame 1, supporting molds 3 are uniformly arranged at the upper end of the driving device 2, a pressing cylinder 4 is arranged on the inner wall of the upper end face of the installation base frame 1, the top end of the pressing cylinder 4 is installed on a pressing plate through a flange, sealing molds 5 matched with the supporting molds 3 for use are uniformly arranged on the lower end face of the pressing plate, and a heating blanket 6 is arranged at the front end of the installation base frame 1; the driving device 2 controls the supporting mold 3 to rotate to a proper working position, the pressing cylinder 4 controls the sealing mold 5 and the supporting mold 3 to be in butt joint, then prepared slurry is poured into the butted mold, the blanket 6 is heated in the rotating operation to accelerate the solidification speed of the slurry in the mold, and the solidified brick body is taken out after the mold with the slurry is moved to the proper position.
The sealing mold 5 comprises a sealing frame 51 arranged on the pressing plate, a pouring gate is arranged on the sealing frame 51, a pressing column 52 is arranged in the middle of the sealing frame 51, a forming block for pouring a clamping groove is arranged on the sealing frame 51, a heating cavity is arranged in the sealing frame 51, and an electric heating tube is arranged in the heating cavity;
the pressing column 52 is of a hollow structure, an electric heating tube in a spiral structure is arranged in the pressing column 52, and heat conducting blocks matched with the auxiliary grooves for use are uniformly arranged on the pressing column 52.
The sealing frame 51 and the auxiliary plate 322 are uniformly used for casting anti-skid convex strips with anti-skid lines.
The pressing cylinder 4 controls the sealing frame 51 to move downwards, and controls the pressing column 52 to extrude the auxiliary plate 322 downwards during the movement, so that the sealing frame 51 is butted with the supporting frame 31, and the prepared slurry is poured into the butted mold through a pouring gate
The supporting mold 3 comprises a supporting frame 31, the supporting frame 31 is of a hexagonal structure with a closed bottom, a forming groove for pouring a clamping block is formed in the inner wall of the supporting frame 31 along the circumferential direction, a telescopic hole is formed in the middle of the lower end of the supporting frame 31, and an auxiliary mechanism 32 is arranged in the middle of the supporting frame 31;
the auxiliary mechanism 32 includes an auxiliary ring 321 installed in the middle of the supporting frame 31, auxiliary grooves are uniformly formed in the auxiliary ring 321 along the circumferential direction of the auxiliary ring, an auxiliary plate 322 is slidably disposed in the auxiliary grooves, the outer side of the auxiliary plate 322 is slidably connected to the supporting frame 31, an extrusion rod 323 is disposed at the lower end of the auxiliary plate 322, a spring is disposed between the auxiliary plate 322 and the auxiliary ring 321, and the extrusion rod 323 sequentially penetrates through the telescopic holes and the insertion holes from top to bottom.
In the butt joint operation, sealing frame 51 drives and presses post 52 and extrudees accessory plate 322 to suitable position downwards, and presses the heat conduction piece that sets up on the post 52 and insert the auxiliary tank in, and the thick liquids pours into the mould after the butt joint inside back, and the thick liquids pours into the shaping groove and solidifies the back and form the joint piece, and the space that forms after the pouring of formation piece is the joint groove, and the electrothermal tube circular telegram back is inside with heat transfer to the mould, improves the solidification rate of the inside thick liquids of mould.
A transmission frame 25 is arranged in the through hole in a sliding fit mode, a return spring is connected between the transmission frame 25 and the transmission column 24, and the transmission frame 25 is abutted against the extrusion rod 323.
The motor 21 controls the rotary cylinder 22 to perform intermittent circular rotation, the transmission column 24 keeps a static state, when the support mold 3 positioned at the upper end of the rotary cylinder 22 is in butt joint with the sealing mold 5, the auxiliary plate 322 is extruded and then extrudes the guide frame 25 through the extrusion rod 323, the extruded guide frame 25 synchronously extrudes the extrusion rod 323 positioned at the lower end of the rotary cylinder 22, and when the upper end mold is in butt joint, the solidified brick in the support mold 3 at the lower end of the rotary cylinder 22 is pushed and extruded.
A molding method of reinforced cement hollow bricks mainly comprises the following processing and molding steps;
step one, performing die assembly operation, namely pressing a cylinder 4 to work and control a sealing die 5 to be butted with a supporting die 3;
pouring slurry, namely pouring the slurry into the butted mold through a pouring gate, electrifying an electric heating pipe to start heating, quickly solidifying the slurry in the mold, and controlling the sealed mold 5 to reset;
and step three, circularly rotating, wherein the motor 21 drives the rotating cylinder 22 to rotate, controlling the support mold 3 of the poured slurry to move to the position right below the installation base frame 1, and extruding the solidified and molded reinforced cement hollow brick from the support mold 3.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A molding method of a reinforced cement hollow brick comprises a brick body, wherein the brick body is of a hexagonal structure, the middle part of the brick body is of a hollow circular structure, and the upper end surface and the lower end surface of the brick body are provided with anti-skid lines;
the side walls of the brick body along the circumferential direction are provided with clamping blocks and clamping grooves matched with the clamping blocks for use;
the clamping block comprises a blocking block arranged on the side wall of the brick body, the lower end of the blocking block is provided with a sliding block, and the width of the sliding block is of a trapezoidal structure with a decreasing structure from inside to outside;
the upper end of the clamping groove is of a rectangular structure clamped by the blocking block in a matching mode, and the lower side of the clamping groove is of a trapezoidal structure connected by the sliding block in a matching mode;
foretell strenghthened type cement hollow brick uses forming device preparation, its characterized in that: the forming device comprises an installation base frame (1), a driving device (2) is arranged in the middle of the installation base frame (1), supporting molds (3) are uniformly arranged at the upper end of the driving device (2), a pressing cylinder (4) is arranged on the inner wall of the upper end face of the installation base frame (1), the top end of the pressing cylinder (4) is installed on a pressing plate through a flange, sealing molds (5) matched with the supporting molds (3) are uniformly arranged on the lower end face of the pressing plate, and a heating blanket (6) is arranged at the front end of the installation base frame (1);
the driving device (2) comprises a motor (21) which is installed on the installation base frame (1) through a motor base, an output shaft of the motor (21) is connected with the right end of a rotating cylinder (22) through a coupler, the left end of the rotating cylinder (22) is connected onto an annular sliding chute (23), the annular sliding chute (23) is fixed on the installation base frame (1), a transmission column (24) is fixed at the left end of the installation base frame (1), the right end of the transmission column (24) is installed on the rotating cylinder (22) through a bearing, through holes are uniformly formed in the rotating cylinder (22), and through holes matched with the through holes in motion are formed in the transmission column (24); a transmission frame (25) is arranged in the through hole in a sliding fit manner, a return spring is connected between the transmission frame (25) and the transmission column (24), and the transmission frame (25) is abutted against an extrusion rod (323);
the supporting die (3) comprises a supporting frame (31), the supporting frame (31) is of a hexagonal structure with a closed bottom, a forming groove for pouring a clamping block is formed in the inner wall of the supporting frame (31) along the circumferential direction of the supporting frame, a telescopic hole is formed in the middle of the lower end of the supporting frame (31), and an auxiliary mechanism (32) is arranged in the middle of the supporting frame (31);
the sealing mold (5) comprises a sealing frame (51) arranged on the pressing plate, a pouring gate is arranged on the sealing frame (51), a pressing column (52) is arranged in the middle of the sealing frame (51), a forming block for pouring a clamping groove is arranged on the sealing frame (51), a heating cavity is arranged in the sealing frame (51), and an electric heating tube is arranged in the heating cavity;
the auxiliary mechanism (32) comprises an auxiliary circular ring (321) arranged in the middle of the supporting frame (31), auxiliary grooves are uniformly formed in the auxiliary circular ring (321) along the circumferential direction of the auxiliary circular ring, an auxiliary plate (322) is arranged in each auxiliary groove in a sliding mode, the outer side of each auxiliary plate (322) is connected to the supporting frame (31) in a sliding mode, an extrusion rod (323) is arranged at the lower end of each auxiliary plate (322), a spring is arranged between each auxiliary plate (322) and the corresponding auxiliary circular ring (321), and the extrusion rods (323) sequentially penetrate through the telescopic holes and the through holes from top to bottom;
the molding method of the reinforced cement hollow brick mainly comprises the following processing and molding steps:
step one, performing die assembly operation, namely pressing a working control sealing die (5) of a cylinder (4) to be butted with a supporting die (3);
step two, slurry is poured, the slurry is poured into the butted mold through a pouring gate, the electric heating pipe is electrified to start heating, the slurry in the mold is rapidly solidified, and the sealed mold (5) is controlled to reset;
step three, the circulation rotates, and motor (21) drive a rotation section of thick bamboo (22) rotatory, and the support mould (3) of control pouring back thick liquids move to installation bed frame (1) under, will solidify fashioned strenghthened type cement hollow brick and extrude from supporting mould (3), and the concrete process is: the motor (21) controls the rotating cylinder (22) to rotate in an intermittent circulating mode, the transmission column (24) keeps in a static state, when the supporting die (3) located at the upper end of the rotating cylinder (22) is in butt joint with the sealing die (5), the auxiliary plate (322) extrudes the guide frame (25) through the extrusion rod (323) after being extruded, the extrusion rod (323) located at the lower end of the rotating cylinder (22) is synchronously extruded by the guide frame (25) after being extruded, and when the upper end die is in butt joint, bricks solidified in the supporting die (3) at the lower end of the rotating cylinder (22) are pushed and extruded.
2. The molding method of the reinforced cement hollow brick as claimed in claim 1, wherein: the pressing column (52) is of a hollow structure, an electric heating tube in a spiral structure is arranged in the pressing column (52), and heat conducting blocks matched with the auxiliary grooves are uniformly arranged on the pressing column (52).
3. The molding method of the reinforced cement hollow brick as claimed in claim 1, wherein: the sealing frame (51) and the auxiliary plate (322) are uniformly used for pouring anti-skid convex strips with anti-skid lines.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910898456.7A CN110593038B (en) | 2019-09-23 | 2019-09-23 | Reinforced cement hollow brick, forming device and forming method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910898456.7A CN110593038B (en) | 2019-09-23 | 2019-09-23 | Reinforced cement hollow brick, forming device and forming method |
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| CN110593038A CN110593038A (en) | 2019-12-20 |
| CN110593038B true CN110593038B (en) | 2021-09-10 |
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| CN111841740B (en) * | 2020-07-28 | 2021-07-30 | 北京路新恒通沥青混凝土有限公司 | Preparation process of asphalt concrete |
| CN112140281B (en) * | 2020-09-19 | 2021-11-23 | 山东阳光众泰机械工程有限公司 | High-strength light brick and processing method thereof |
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| CN209053060U (en) * | 2018-10-16 | 2019-07-02 | 长江水利委员会长江科学院 | A kind of block protective slope structure of the stagnant silt of reinforced energy dissipating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2270617Y (en) * | 1996-01-05 | 1997-12-17 | 南昌重型机械厂 | Semidry extrusion electrothermal demould non-burning hollow block die |
| CN103171046A (en) * | 2011-12-27 | 2013-06-26 | 北京仁创科技集团有限公司 | Brick molding device and molding equipment |
| CN207130683U (en) * | 2017-05-14 | 2018-03-23 | 刘春霞 | A kind of environment-friendly type revetment brick |
| CN108098976A (en) * | 2017-12-14 | 2018-06-01 | 东莞理工学院 | A kind of injection forming mechanism of neutron radiation protection multi-layer concrete block |
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| CN110593038A (en) | 2019-12-20 |
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Effective date of registration: 20210818 Address after: Room 2259, 661 MaoYuan Road, Fengxian District, Shanghai, 201499 Applicant after: Shanghai Xiaoqi New Energy Technology Co.,Ltd. Address before: Jiaozuo University, 458 Gongye Road, Shanyang District, Jiaozuo City, Henan Province Applicant before: Zhao Huinan |
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