A building material pouring forming device based on intelligent construction and a use method thereof

The intelligent building material casting and molding equipment utilizes a flexible positioning part and lifting mechanism to automatically apply and position the protective film, solving the problem of the protective film fitting with the mold, realizing real-time monitoring and intelligent adjustment of the material status, and improving production efficiency and yield.

CN120116311BActive Publication Date: 2026-03-03TONGZHOU CONSTR GENERAL CONTRACTING GROUP +1
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Patent Information

Application Number
CN202510408165.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-04-02
Publication Date
2026-03-03
Estimated Expiration
2045-04-02

AI Technical Summary

Technical Problem

In the current process of pouring building materials, the protective film is difficult to adhere to the molding mold, which makes demolding difficult. Furthermore, it is impossible to monitor the uniformity and proportion of material mixing in real time, resulting in resource waste and affecting the construction process.

Method used

The intelligent building material casting and molding equipment uses a flexible positioning part and lifting mechanism to achieve automatic film covering and positioning of the protective film. Combined with passive lifting components to monitor the material status, it utilizes vacuum adsorption fixation and adjustable side plate design to achieve rapid demolding and intelligent adjustment.

Benefits of technology

It improves coating efficiency and demolding speed, reduces material waste, ensures molding quality and construction efficiency, and realizes intelligent production.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a building material pouring forming equipment based on intelligent construction and a use method thereof. The forming equipment comprises a rack, a pouring platform and a loading mechanism arranged on the rack, a building material forming cavity is formed in the pouring platform, assembling of a forming die and covering of a protective film are carried out in the building material forming cavity, the forming die comprises a bottom plate and a side plate hingedly matched with the edge of the bottom plate, the side plate of the forming die is hingedly matched with the bottom plate, the forming die can be in a planar unfolded state when the protective film is covered, the protective film can be ensured to be attached to the surface of the forming die, the passive lifting component is arranged, problems of uneven mixing of building materials or material proportioning can be found when pouring, resource waste is reduced, the yield is improved, and intelligent and energy-saving production is realized.
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Description

Technical Field

[0001] This invention relates to the field of cast building material production technology, specifically to a casting and molding equipment for building materials based on intelligent construction and its usage method. Background Technology

[0002] During construction, structures such as floor slabs need to be cast in molds to form building materials of various specifications that meet requirements for use in construction. During casting, a protective film is often covered on the surface of the mold to facilitate demolding. However, because the mold itself has a certain depth, the protective film needs to be manually arranged after cutting, otherwise it will not be able to keep the protective film adhering to the surface of the mold, which is not conducive to subsequent demolding. At the same time, during casting, the raw materials of building materials (such as concrete) are directly transported by the loading equipment, and the casting volume is controlled only by the flow rate. It is impossible to monitor the uniformity of the mixing of raw materials and the mixing ratio in a timely manner. As a result, some cast products do not meet the construction requirements due to low material viscosity or uneven mixing, which to some extent wastes energy and production resources and affects the construction process. Summary of the Invention

[0003] Technical Objective: To address the shortcomings of existing building material casting processes, this invention discloses a building material casting and forming equipment and its usage method based on intelligent construction, which can achieve rapid and efficient coating of protective film, while simultaneously monitoring and adjusting the raw material state of the casting material in a timely manner.

[0004] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution:

[0005] A building material casting and molding equipment based on intelligent construction includes a frame, a casting platform and a loading mechanism on the frame, a building material molding cavity formed within the casting platform, and the assembly of molding molds and application of protective film within the building material molding cavity. The molding mold includes a base plate and side plates hinged to the edges of the base plate, with flexible positioning parts between the side plates to fix the edges of the protective film. A lifting mechanism is provided within the building material molding cavity to move the base plate up and down, thereby changing the height of the base plate within the building material molding cavity to achieve the assembly of the molding mold after the protective film is applied. A film-applying mechanism is correspondingly provided above the casting platform on the frame to pull the protective film roll for film application.

[0006] Preferably, the middle part of the side plate and the bottom plate of the present invention are elastically hinged, and the lower part of the side plate adopts a planar structure that matches the wall surface of the building material molding cavity. During casting, the molding mold is positioned by the lower part of the side plate matching the building material molding cavity. The thickness of the upper part of the side plate is greater than that of the lower part of the side plate, forming a support platform at the junction. The molding mold is supported and fixed by the matching of the support platform with the platform of the casting platform.

[0007] Preferably, the adjacent side plates of the present invention are provided with positioning slots at the junction of the plate surfaces along the length direction of the corresponding side plates, and the positioning slots of the adjacent side plates form a right-angled groove structure. A clamp is provided on the frame to clamp the positioning block that cooperates with the groove structure to fix the side plates.

[0008] Preferably, the positioning part of the present invention is provided with vacuum adsorption holes on its surface, and the edge of the protective film is adsorbed, positioned and fixed by a vacuum device connected to the vacuum adsorption holes to generate negative pressure.

[0009] Preferably, the lifting mechanism of the present invention includes an active lifting component and a passive lifting component disposed around the active lifting component. The extension length of the passive lifting component is proportional to the force applied, and the amount of building material to be poured is determined by the lifting height of the passive lifting component.

[0010] Preferably, the film coating mechanism of the present invention includes a lifting frame, a fixing roller for installing and fixing the protective film roll on the lifting frame, and a clamping assembly for pulling the protective film on the building material forming cavity so that the protective film covers the surface of the forming mold. The clamping assembly is slidably connected to the lifting frame in the pulling direction when the protective film is covered.

[0011] Preferably, the clamping assembly of the present invention includes clamping plates for symmetrically clamping the upper and lower surfaces of the protective film. The clamping plates are driven by finger cylinders to perform clamping actions. The clamping plates are provided with a cutting blade on the side away from the protective film roll, so that the protective film is cut off on the other side while clamping the protective film.

[0012] This invention discloses a method for using the above-mentioned intelligent construction-based building material casting and molding equipment. The method involves determining the amount of material to be cast in a single operation based on the molding size and type of the material. The molding mold is placed on a casting platform, with the base plate corresponding to the location of the building material molding cavity. A film-coating mechanism is used to coat the surface of the molding mold, covering the base plate and side plates. The protective film is positioned by a positioning part. Then, a lifting mechanism located below the base plate moves the base plate, causing the side plates around the base plate to close and fix adjacent side plates. The building material is then cast using a loading mechanism. After the material has solidified, the side plates are opened, separating the cast material from the molding mold.

[0013] Preferably, during the coating process, the side plates and bottom plates of the forming mold unfold to form a plane under the action of the elastic hinge component, and are laid flat on the surface of the casting platform.

[0014] Preferably, in this invention, when the building material is poured by the loading mechanism, the pouring volume is controlled by the conveying flow rate of the loading mechanism, and after a period of pouring, the pouring material is judged to meet the requirements by the pouring volume of the building material and the force change of the passive lifting component caused by the descent of the molding mold, and the mixing degree and proportion of the building material are adjusted accordingly.

[0015] Beneficial Effects: The building material casting and molding equipment and its usage method based on intelligent construction disclosed in this invention have the following beneficial effects:

[0016] 1. The side plates and bottom plate of the molding die of the present invention are hinged to each other, which allows the molding die to be in a planar unfolded state when the protective film is applied. The protective film is positioned and fixed by the positioning part set between the side plates, which can ensure the adhesion of the protective film to the surface of the molding die, thereby improving the filming efficiency and enabling rapid demolding after casting. The openable side plates also reduce the demolding difficulty after the material has solidified to a certain extent, which is conducive to improving production efficiency.

[0017] 2. The side plate and the bottom plate of the present invention are elastically hinged. By utilizing the elastic force of the hinged part, the side plate is in an open state relative to the bottom plate in a natural state. This facilitates the transportation and placement of the molding mold and also assists in demolding.

[0018] 3. By designing the shape of the side plate, the present invention enables accurate splicing and assembly of the molding mold through the cooperation between the lower part of the side plate and the wall of the building material molding cavity. By designing the building material molding cavity into a stepped hole structure with different opening sizes, it is possible to assemble molding molds of different sizes and specifications.

[0019] 4. The side plate of the present invention is provided with a positioning slot. By embedding a positioning block in the positioning slot, the stability of the mold structure after casting can be ensured until the material is solidified and formed.

[0020] 5. The positioning part of the present invention uses vacuum adsorption to fix the edge of the protective film, which can be quickly removed after the molding mold is coated. The positioning part can be reused to position and fix the coating of different molding molds.

[0021] 6. The lifting mechanism of the present invention is equipped with a passive lifting component, and the force on the passive lifting component is proportional to the extension length. During pouring, the extension length of the passive lifting component caused by the gravity of the pouring material can be compared with the material actually conveyed by the loading mechanism. This allows for the detection of uneven mixing of building materials or problems with material proportions, reducing resource waste, improving yield, and achieving intelligent and energy-saving production.

[0022] 7. The film coating mechanism of the present invention can move along the height direction by being driven by the lifting frame, and while clamping the protective film, it cuts the protective film that needs to be covered on the surface of the molding mold on the other side, thereby realizing automatic film coating and improving casting efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0024] Figure 1 This is a schematic diagram of the overall structure of the casting and molding equipment of the present invention;

[0025] Figure 2 This is a schematic diagram of the casting platform structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the mold unfolded state of the present invention;

[0027] Figure 4 This is a schematic cross-sectional view of the side plate of the molding die of the present invention;

[0028] Figure 5 This is a schematic diagram showing the interaction between the passive lifting component of the present invention and the base plate of the forming mold;

[0029] Figure 6 This is a schematic diagram of the coating mechanism of the present invention;

[0030] Among them, 1-frame, 2-pouring platform, 3-loading mechanism, 4-building material forming cavity, 5-forming mold, 6-base plate, 7-side plate, 8-positioning part, 9-film covering mechanism, 10-supporting table, 12-positioning slot, 13-active lifting component, 14-passive lifting component, 15-lifting frame, 16-fixed roller, 17-clamping plate, 18-finger cylinder, 19-cutting knife, 20-disc spring, 21-motor. Detailed Implementation

[0031] Reference will now be made in detail to embodiments of the present disclosure, one or more of which are set forth herein. Each embodiment and example is provided by way of explanation of the apparatus, composition, and materials of the present disclosure, and not by way of limitation. Rather, the following description provides convenient illustrations for implementing exemplary embodiments of the present disclosure. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made to the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0032] like Figures 1-6 As shown, this invention discloses a building material casting and molding equipment based on intelligent construction, including a frame 1. A casting platform 2 and a loading mechanism 3 are provided on the frame 1. A building material molding cavity 3 is formed in the casting platform 2. A molding mold 5 is assembled and covered with a protective film in the building material molding cavity 3. The molding mold 5 includes a base plate 6 and side plates 7 that are hinged to the edges of the base plate 6. A flexible positioning part 8 is provided between the side plates 7 to fix the edge of the protective film. A lifting mechanism is provided in the building material molding cavity 4 to drive the base plate 6 to move up and down. By changing the height of the base plate 6 in the building material molding cavity 4, the assembly of the molding mold 5 after the protective film is covered is realized. A film covering mechanism 9 for pulling the protective film roll for film covering is correspondingly provided above the casting platform 2 on the frame 1.

[0033] The coating mechanism 9 can unfold the rolled protective film. After the forming mold 5 is placed on the casting platform 2, the unfolded protective film is fixed by the positioning part 8, so that the protective film can cover the surface of the forming mold 5. The positioning part 8 is made of deformable hollow flexible material, such as rubber, and has vacuum adsorption holes on its surface. The vacuum equipment connected to the vacuum adsorption holes generates negative pressure to adsorb and fix the corners of the protective film. Preferably, the positioning part 8 can be set on the side plate 7 and move synchronously with the side plate 7. This makes it easy for the protective film to be folded with the side plate 7 when the forming mold 5 is assembled, and keeps the upper part of the protective film always attached to the surface of the side plate 7, thereby preventing the protective film from falling off under the action of gravity and achieving stable and reliable adhesion of the protective film.

[0034] The present invention utilizes a foldable and assembleable molding mold 5 and a positioning part 8 that moves synchronously with the side plate to automatically complete the protective film covering operation, thereby improving the casting efficiency. At the same time, the side plate 7, which can be opened and closed, also facilitates the demolding of the material after it is formed.

[0035] In an embodiment of the present invention, the middle part of the side plate 7 is elastically hinged to the bottom plate 6. The lower part of the side plate 7 adopts a planar structure that matches the wall of the building material molding cavity 4. During casting, the molding mold is positioned by the lower part of the side plate 7 matching the building material molding cavity 4. The upper part of the side plate 7 is thicker than the lower part, forming a support platform 10 at the junction. The molding mold 5 is supported and fixed by the support platform 10 matching the platform of the casting platform 2. Through the planar design of the lower part of the side plate, it matches the wall of the building material molding cavity 4. As the bottom plate rises and falls, the side plate is folded synchronously, improving the assembly efficiency of the molding mold. Furthermore, the opening of the building material molding cavity can be designed as follows: Figure 2 The stepped hole structure shown has a larger opening size at the bottom than at the top along the height direction. This allows for a unified pouring platform that can pour various molds of different specifications, improving the equipment's versatility and reducing the equipment cost required for production. The support platform 10 formed by the thickness difference on the side plate 7 can limit the maximum downward movement distance of the mold 5 in the building material forming cavity 4, ensuring that part of the mold structure is always above the pouring platform 2. This facilitates the transfer and movement of the mold, thereby enabling continuous pouring of building materials.

[0036] Meanwhile, considering that the material needs time to solidify and form, the mold 5 after casting needs to be removed from the casting platform. During this process, it is necessary to keep the side plate 7 stable to avoid affecting the forming effect due to the material not being solidified. To this end, the adjacent side plates 7 of the present invention are provided with positioning slots 12 along the length direction of the corresponding side plates at the interface of the plate surfaces. The positioning slots 12 of the adjacent side plates 7 form a right-angled groove structure. A clamp is provided on the frame 1 to clamp the positioning block that cooperates with the groove structure to fix the side plate. The positioning block is inserted into the positioning slot 12 by clamping the clamp, so as to realize the mechanical locking of the edge of the adjacent side plate. When the mold 5 needs to be transferred and moved, the side plate will not move, and the blocking and limiting of the side of the building material in the mold can always be maintained.

[0037] When assembling the molding mold 5, the base plate 6 needs to be moved within the building material molding cavity 4 by a lifting mechanism. The drive end of this lifting mechanism needs to be detachably connected to the base plate, such as by electromagnetic adsorption, which can switch between connected and disconnected states. The lifting mechanism can be driven by existing mature lifting methods such as cylinders, electric push rods, and hydraulic lifts. Different lifting methods do not affect the implementation of the present invention.

[0038] In an embodiment of the present invention, the lifting mechanism includes an active lifting component 13 and passive lifting components 14 disposed around the active lifting component 13. The active lifting component 13 is connected to the base plate and drives the base plate 6 to move for the assembly of the forming mold. The extension length of the passive lifting component 14 is proportional to the force. After the active lifting component 13 drives the base plate to move down to complete the assembly of the forming mold 5, the lifting end of the active lifting component 13 disengages from the base plate 6, the forming mold 5 remains in the building material forming cavity 4, and the end of the passive lifting component abuts against the base plate, as shown in the figure. Figure 5 As shown, the amount of building materials used in the pouring is determined by the lifting height of the passive lifting component 14. As the base plate moves down, the compression of the disc spring 20 below the lifting end of the passive lifting component changes synchronously. With the help of the preset pressure sensor, the corresponding pressure can be obtained intuitively, thereby obtaining the actual amount of building materials used in the pouring at the current moment. Combined with the amount of building materials conveyed by the loading mechanism 13, the deviation between the theoretically increased weight and the actual detected weight can be judged. Uneven mixing of building materials or incorrect proportions can lead to large numerical deviations. In the case of large deviations, the pouring is stopped, and the mixing process of building materials is checked and adjusted. This allows for timely adjustments during the pouring process to ensure the quality of the poured product, reduce the defect rate, reduce raw material loss, and achieve the goal of intelligent and energy-saving production.

[0039] The coating mechanism 9 of the present invention can be directly implemented using mature coating equipment in the prior art. In the embodiments of the present invention, a type of equipment capable of coating is provided, but this does not limit the scope of the coating mechanism of the present invention. Figure 1As shown, the laminating mechanism of the present invention includes a lifting frame 15, which can adjust the laminating height of the protective film. The lifting frame 15 is designed to slide and engage with the frame 1 in the height direction. A motor 21 is installed on the lifting frame 15, and the lifting drive is achieved by the motor 21 and the gear and rack structure. This is a common lifting drive form, which will not be described in detail in the present invention. A fixing roller 16 for installing and fixing the protective film roll is provided on the lifting frame 15, and a clamping component for pulling the protective film on the building material forming cavity so that the protective film covers the surface of the forming mold 5. The clamping component is slidably connected to the lifting frame in the pulling direction when the protective film is covered, so that the protective film can be clamped and pulled to perform laminating. Specifically, the clamping component of the present invention includes clamping plates 17 for symmetrically clamping the upper and lower surfaces of the protective film. The clamping plates 17 are driven by finger cylinders 18 to perform clamping action. A cutting blade 19 is provided on the side of the clamping plate 17 away from the protective film roll, so that the protective film on the other side is cut while clamping the protective film. The film-coating mechanism 9 of this invention can continue to perform the next film coating after the protective film is completely cut. Compared with the method in CN111906906A, which uses a rectangular cutter to cut the protective film and needs to keep the edge of the protective film as a margin so that the protective film can be pulled again, this invention can reduce the size requirements of the protective film, reduce the amount of waste generated by film coating, and has good environmental protection. It further reduces the cost of casting materials and achieves energy-saving production.

[0040] This invention also discloses a method for using the above-mentioned intelligent construction-based building material casting and molding equipment. The amount of material to be cast in a single batch is determined according to the molding size and type of the casting material. This amount of material is a reference value obtained by theoretical calculation or actual measurement of raw materials that meet the requirements based on the mixing ratio of building materials. Under the same conveying capacity, if the difference between the actual weight difference and the reference value is within the allowable deviation range, it means that the raw materials of the cast building materials meet the requirements. Otherwise, it indicates that there is a problem with the raw materials, which will affect the quality of the subsequent cast and molded products.

[0041] During pouring, the forming mold is placed on the pouring platform, with its base plate corresponding to the location of the building material forming cavity. The side plates and base plate of the forming mold unfold to form a flat surface under the action of elastic hinge components, lying flat on the surface of the pouring platform. A film-coating mechanism applies a protective film to the surface of the forming mold, covering the base plate and side plates. The protective film is positioned by a positioning component. Then, an active lifting component located below the base plate moves the base plate, causing the side plates around the base plate to close and form the mold. Positioning blocks then secure adjacent side plates. Finally, the building material is loaded by a feeding mechanism. During the pouring and loading process, the pouring volume is controlled by the conveying flow rate of the loading mechanism. After a period of pouring, the pouring volume and the stress changes of the passive lifting components caused by the descent of the molding mold are used to determine whether the pouring material meets the requirements. Adjustments are then made to the mixing degree and ratio of the building materials. The pouring volume can be calculated statistically based on the flow rate of the loading mechanism and the pouring time. After pouring is completed, the material in the molding mold is allowed to solidify. Then, the positioning block is removed, the side plate is opened, and the pouring material is separated from the molding mold, completing demolding and obtaining the final poured building material product. By using the pouring and molding equipment of this invention, pouring and demolding operations can be performed quickly and efficiently. It can also automatically identify problems with the pouring raw materials, achieving intelligent production and effectively ensuring the quality of the molded product.

Claims

1. A construction material casting molding apparatus based on smart construction, characterized by, The utility model provides a building material forming device, including frame (1), the frame (1) is provided with pouring platform (2) and charging mechanism (3) on it, the building material forming cavity (4) is formed in pouring platform (2), and the assembling and protective film covering of forming mould (5) are carried out in building material forming cavity (4), the forming mould (5) includes bottom plate (6) and the side plate (7) of mutual hinged cooperation with bottom plate (6) edge, flexible positioning part (8) is arranged between side plate (7), and the fixing of protective film edge is carried out through positioning part (8), and lifting mechanism that drives bottom plate (6) moves up and down is arranged in building material forming cavity (4), and the assembling of forming mould (5) after protective film covering is realized through changing the height of bottom plate (6) in building material forming cavity (4);The frame (1) is provided with the film covering mechanism (9) of pulling protective film roll for film covering above pouring platform (2). The middle part of side plate (7) is elastically hinged between bottom plate (6), and the lower part of side plate (7) adopts the plane structure matched with the wall surface of building material forming cavity (4), and the forming mould is positioned through the cooperation of the lower part of side plate (7) and building material forming cavity (4) when pouring, and the thickness of the upper part of side plate (7) is greater than the lower part of side plate (7), and the support platform (10) is formed at the junction, and the support fixing of forming mould (5) is carried out through the cooperation of support platform (10) and the platform of pouring platform (2). The adjacent side plate (7) is provided with positioning clamping groove (12) along the length direction of corresponding side plate at the junction of plate surface, and the positioning clamping groove (12) of adjacent side plate (7) forms the slot structure of right angle shape, and the clamps for clamping the positioning block matched with slot structure are correspondingly arranged on the frame (1) to fix the side plate. The lifting mechanism includes driving lifting component (13) and passive lifting component (14) arranged around driving lifting component (13), and the extension length of passive lifting component (14) is proportional to stress, and the amount of building material for pouring is judged by the lifting height of passive lifting component (14), and the deviation between the theoretical weight and the actual detected weight is judged in combination with the amount of building material delivered by charging mechanism (3).

2. The smart construction based building material casting forming apparatus according to claim 1, wherein, The surface of positioning part (8) is provided with vacuum suction hole, and the positioning and fixing of the edge of protective film are carried out through the negative pressure generated by vacuum equipment communicated with vacuum suction hole.

3. The smart construction based building material casting forming apparatus as claimed in claim 1, wherein, The film covering mechanism (9) includes lifting frame (15), fixing roller (16) for installing and fixing the protective film roll is arranged on lifting frame (15), and clamping assembly for pulling the protective film to move on building material forming cavity to make the protective film cover the surface of forming mould (5), and the clamping assembly is connected with lifting frame in sliding fit along the pulling direction of protective film covering.

4. The smart construction based building material casting forming apparatus as claimed in claim 3, wherein, The clamping assembly includes clamping plate (17) for symmetrically clamping the upper and lower surfaces of protective film, and the clamping plate (17) is driven to carry out clamping action by finger air cylinder (18), and cutting knife (19) is arranged on the side away from protective film roll, and the other side protective film is cut off while clamping the protective film.

5. The method of using a smart construction based building material casting forming apparatus according to any one of claims 1-4, wherein, According to the forming size of the casting material and the type of the casting material, the amount of the material needed to be cast at one time is determined, the forming mold is placed on the casting platform, the bottom plate corresponds to the position of the building material forming cavity, the film covering mechanism is used to cover the surface of the forming mold, the protective film covers the surface of the bottom plate and the side plate of the forming mold, and the positioning of the protective film is carried out through the positioning part; then the bottom plate of the forming mold is driven to move through the lifting mechanism arranged below the bottom plate of the forming mold, the side plates around the bottom plate are folded to form and fix the adjacent side plates, then the building material is cast through the charging mechanism, after the material is solidified and formed, the side plates are opened, and the separation between the casting material and the forming mold is realized.

6. A method of using a smart construction based building material casting forming apparatus according to claim 5, wherein, When the film is covered, the side plates and the bottom plate of the forming mold are unfolded to form a plane under the action of the elastic hinge part, and are laid flat on the surface of the casting platform.

7. A method of using a smart construction based building material casting forming apparatus as claimed in claim 5, wherein, When the building material is cast by the charging mechanism, the casting amount is controlled by the conveying flow of the charging mechanism, and after a period of casting, whether the casting material meets the requirements is judged by the casting amount of the building material and the stress change of the passive lifting part caused by the lowering of the forming mold, and the mixing degree and the ratio of the building material are adjusted.

Citation Information

Patent Citations

  • Building material cement column pouring forming equipment

    CN111906906A

  • Concrete prefabricated part production equipment

    CN118528382A

  • Cover beam mold pouring weighing mechanism and weighing system

    CN216283896U

  • High-viscosity PE protective film stretching device

    CN222540072U