A precision batching and mixing device for low-shrinkage, early-strength UHPC premix

Abstract

This utility model discloses a precision batching and mixing device for low-shrinkage, early-strength UHPC premix, belonging to the field of concrete technology. The device includes a premixing tank with a protective cover bolted to its top. The cover has feed gates for fiber materials and can be flipped open on both sides. A dual-motor module is installed at one end of the tank. To address the problem that existing ultra-high performance concrete incorporates a large amount of reinforcing fibers, but these fibers are lightweight and cannot be evenly distributed during mixing, leading to a decrease in concrete strength, this invention solves the industry problem of unevenly dispersing lightweight, trace materials such as fibers through an integrated feeding system consisting of a conveying pipe, a distribution pipe, a magnetic valve nozzle, and a spiral distributor.

Description

Technical Field

[0001] This utility model relates to the field of concrete technology, specifically to a precision batching and mixing device for low-shrinkage, early-strength UHPC premix. Background Technology

[0002] Ultra-high performance concrete (UHPC) is a cement-based composite material with high strength, high toughness, and high durability. Its compressive strength typically exceeds 150 MPa, far surpassing that of ordinary concrete. The main components of UHPC include cement, fine aggregate, and reinforcing fibers. Through special proportioning and processing, it has broad application prospects in construction engineering, such as bridges and building facades.

[0003] Existing ultra-high performance concrete incorporates a large amount of reinforcing fibers, but the fibers themselves are relatively light and cannot be evenly distributed in the mixture during mixing, resulting in a decrease in concrete strength. Utility Model Content

[0004] The purpose of this utility model is to provide a precision batching and mixing device for low-shrinkage, early-strength UHPC premix. Through an integrated feeding system consisting of a conveying pipe, a diversion pipe, a magnetic control valve nozzle, and a spiral feeder, it solves the industry problem of the difficulty in uniformly dispersing lightweight and trace materials such as fibers, and can solve the problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a precision batching and mixing device for low-shrinkage, early-strength UHPC premix, comprising a premixing tank, a protective cover plate being bolted to the top of the premixing tank, and feeding gates for feeding fiber material and reversible openings being provided on both sides of the protective cover plate, a dual-motor module being installed at one end of the premixing tank, wherein a belt drive assembly is installed between the dual-motor modules, and a dual-tank mixing chamber is provided inside the premixing tank.

[0006] Preferably, the inner wall of the dual-tank mixing chamber is bolted with anti-collision lining plates, and sealing rings are provided between the anti-collision lining plates. Two sets of temperature control components are installed at the other end of the premixing tank.

[0007] Preferably, the interior of the dual-tank mixing chamber is equipped with two sets of stirring shafts, wherein one end of the stirring shaft is rotatably connected to the premixing tank through a bearing, and the other end is rotated through gear meshing with a gear transmission.

[0008] Preferably, the gear transmission and the belt drive assembly are connected via a transmission rod.

[0009] Preferably, the stirring shaft includes multiple wall-mounted blades, which are bolted to the stirring shaft and are fitted with the anti-collision liner.

[0010] Preferably, a conveying pipe is installed on the inner side of the protective cover, and the conveying pipe extends to the outer surface of the protective cover, the conveying pipe including a diversion pipe.

[0011] Preferably, the bottom of the diverter is equipped with a plurality of integrally formed magnetic valve nozzles, and the bottom of the magnetic valve nozzles is equipped with a spiral feeder, wherein the spiral feeder and the magnetic valve nozzles are rotatably connected by bearings.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. The present invention features a dual-motor module-driven dual-tank mixing chamber and two sets of stirring shafts that form a high-intensity convection field, which can quickly break up powder agglomeration and fiber bridging, enabling ultrafine powder, fiber, quartz sand and other components to achieve macroscopic uniformity at the molecular level in a short time. This is the basis for preparing high-performance UHPC and directly contributes to its final mechanical properties and volume stability.

[0014] 2. This utility model solves the industry problem of uneven dispersion of lightweight and trace materials such as fibers by using an integrated material distribution system consisting of a conveying pipe, a diversion pipe, a magnetic control valve nozzle, and a spiral distributor. The magnetic control valve nozzle enables precise quantitative and timing control, while the spiral distributor enables spatial pre-dispersion. The two systems work together to ensure a three-dimensional randomized and uniform distribution of fibers in the matrix, greatly improving the toughness and crack resistance of UHPC. Attached Figure Description

[0015] Figure 1 This is the overall front view of the present invention;

[0016] Figure 2 This is a schematic diagram of the internal structure of the premixing tank of this utility model.

[0017] In the diagram: 1. Premixing tank; 2. Dual motor module; 3. Conveying pipe; 101. Protective cover; 102. Anti-collision liner; 103. Temperature control component; 104. Dual-tank mixing chamber; 1011. Feed gate; 201. Belt drive component; 202. Gear transmission; 203. Mixing shaft; 204. Wall-mounted scraper; 301. Diverter pipe; 302. Magnetic valve nozzle; 303. Spiral distributor. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] To address the problem that existing ultra-high performance concrete incorporates a large amount of reinforcing fibers, but these fibers are lightweight and cannot be evenly distributed in the mixture during mixing, leading to a decrease in concrete strength; please refer to... Figure 1-2 The present invention provides the following solution:

[0020] A precision batching and mixing device for low-shrinkage, early-strength UHPC premix includes a premixing tank 1. A protective cover 101 is bolted to the top of the premixing tank 1, and the protective cover 101 has feeding gates 1011 on both sides for feeding fiber material and can be flipped open. A dual-motor module 2 is installed at one end of the premixing tank 1, wherein a belt drive assembly 201 is installed between the dual-motor modules 2. The interior of the premixing tank 1 is provided with a dual-tank mixing chamber 104.

[0021] The inner wall of the double-tank mixing chamber 104 is bolted with anti-collision liner 102, and a sealing ring is provided between the anti-collision liners 102. Two sets of temperature control components 103 are installed at the other end of the premixing tank 1. Two sets of stirring shafts 203 are installed inside the double-tank mixing chamber 104. One end of the stirring shaft 203 is rotatably connected to the premixing tank 1 through a bearing, and the other end is rotated through gear meshing with the gear transmission 202. The gear transmission 202 is connected to the belt drive assembly 201 through a transmission rod. The stirring shaft 203 includes multiple wall-mounted scrapers 204. The wall-mounted scrapers 204 are bolted to the stirring shaft 203, and the wall-mounted scrapers 204 are in contact with the anti-collision liner 102.

[0022] In this embodiment, the dual-motor module 2 is started, and the power is transmitted to the gear transmission 202 via the belt drive assembly 201. The gear transmission 202 distributes the power to the two sets of stirring shafts 203. The two sets of stirring shafts 203 rotate synchronously in opposite directions or in the same direction at different speeds within the dual-tank mixing chamber 104, driving the multi-segment wall-mounted scrapers 204 to move. This creates a strong convection and shear flow field within the chamber, allowing all the dry powder and fiber materials and the subsequently added liquid components in the premixing tank 1 to be rapidly pulled and sheared together in three-dimensional space, greatly improving the mixing uniformity and efficiency. At the same time, the high-speed rotating wall-mounted scrapers 204 maintain close contact and slide against the anti-collision liner 102 fixed to the inner wall of the dual-tank mixing chamber 104, continuously scraping off the material adhering to the inner wall during the mixing process, preventing material caking, and ensuring that each batch of material can be completely incorporated into the main mixing stream, eliminating mixing dead zones.

[0023] A conveying pipe 3 is installed on the inner side of the protective cover plate 101, and the conveying pipe 3 extends to the outer surface of the protective cover plate 101. The conveying pipe 3 includes a diversion pipe 301. Multiple integrally formed magnetic valve nozzles 302 are installed at the bottom of the diversion pipe 301. A spiral feeder 303 is installed at the bottom of the magnetic valve nozzle 302. The spiral feeder 303 and the magnetic valve nozzle 302 are rotatably connected by bearings.

[0024] In this embodiment, during the preparation of UHPC, key fibers and special additives are input through the conveying pipe 3. The diversion pipe 301 at the end of the conveying pipe 3 can evenly distribute the material to multiple magnetic control valve nozzles 302. The magnetic control valve nozzles 302 have precise switching and flow control functions to ensure that trace amounts of material are added in batches and quantities according to the set program. The material falls through the magnetic control valve nozzles 302 into the spiral distributor 303 at its bottom. During the rotation process, the spiral distributor 303 performs initial rotation and scattering of the falling fibers or powder, realizing the initial diffusion before entering the premixing tank 1, effectively avoiding fiber clumping or local accumulation of powder.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision batching and mixing device for low-shrinkage, early-strength UHPC premix, characterized in that, The premixing tank (1) is equipped with a protective cover plate (101) bolted to the top of the premixing tank (1), and the protective cover plate (101) is provided with feeding gates (1011) for feeding fiber materials and can be flipped open on both sides. A dual motor module (2) is installed at one end of the premixing tank (1), wherein a belt drive assembly (201) is installed between the dual motor modules (2), and a dual mixing chamber (104) is provided inside the premixing tank (1).

2. The precision batching and mixing device for low-shrinkage, early-strength UHPC premix according to claim 1, characterized in that: The inner wall of the dual-tank mixing chamber (104) is bolted with anti-collision liner (102), and a sealing ring is provided between the anti-collision liner (102). Two sets of temperature control components (103) are installed at the other end of the premixing tank (1).

3. The precision batching and mixing device for low-shrinkage, early-strength UHPC premix according to claim 2, characterized in that: The dual-tank mixing chamber (104) is equipped with two sets of stirring shafts (203). One end of the stirring shaft (203) is rotatably connected to the premixing tank (1) through a bearing, and the other end is rotated through gear meshing with the gear transmission (202).

4. The precision batching and mixing device for low-shrinkage, early-strength UHPC premix according to claim 3, characterized in that: The gear transmission (202) is connected to the belt drive assembly (201) via a transmission rod.

5. The precision batching and mixing device for low-shrinkage, early-strength UHPC premix according to claim 4, characterized in that: The stirring shaft (203) includes multiple wall-mounted scrapers (204), which are connected to the stirring shaft (203) by bolts, and the wall-mounted scrapers (204) are attached to the anti-collision liner (102).

6. The precision batching and mixing device for low-shrinkage, early-strength UHPC premix according to claim 1, characterized in that: The inner side of the protective cover (101) is equipped with a conveying pipe (3), and the conveying pipe (3) extends to the outer surface of the protective cover (101). The conveying pipe (3) includes a diversion pipe (301).

7. The precision batching and mixing device for low-shrinkage, early-strength UHPC premix according to claim 6, characterized in that: The bottom of the diversion pipe (301) is equipped with a plurality of integrally formed magnetic control valve nozzles (302), and the bottom of the magnetic control valve nozzles (302) is equipped with a spiral feeder (303), wherein the spiral feeder (303) and the magnetic control valve nozzles (302) are rotatably connected by bearings.

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