Device for improving distribution uniformity of steel fibers in steel fiber reinforced concrete

Abstract

The invention discloses a device for improving distribution uniformity of steel fibers in steel fiber reinforced concrete, and relates to the field of concrete manufacturing equipment.The device comprises a variable-frequency speed-regulating feeder, a shearing device, a premixing bin and a main mixing bin which are sequentially arranged and communicated, and one side of the premixing bin is connected with an aggregate quantitative conveying device; and the output side of the main mixing bin is connected with an output pipe. According to the invention, a'quantitative feeding-dynamic dispersing-premixing buffering-main mixing output 'integrated steel fiber feeding and mixing linkage system is constructed, so that the whole-process controllable distribution of steel fibers in the concrete preparation process is realized; the problems of easy entanglement, non-uniform distribution, layered settlement and the like of fibers in traditional concrete mixing are effectively solved; the homogeneity and the structural performance of a concrete material are improved, and reliable equipment support and process guarantee are provided for engineering popularization of high-content steel fiber concrete.

Description

Technical Field

[0001] This invention relates to the field of concrete manufacturing equipment, and more particularly to a device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete. Background Technology

[0002] In the performance enhancement and engineering application of steel fiber reinforced concrete, the uniformity of steel fiber distribution is a crucial parameter determining its reinforcement effect and structural reliability. Due to its excellent crack resistance, impact resistance, and durability, steel fiber reinforced concrete is widely used in engineering fields such as tunnel lining and bridge decks. However, in the actual production process of steel fiber reinforced concrete, there are still many technical challenges in the placement and distribution of steel fibers, mainly in the following two aspects: (1) Due to its large mass, high linear stiffness, and large specific surface area, steel fiber is prone to agglomeration and sedimentation, resulting in uneven distribution and clustering during the mixing process. This not only seriously affects the overall workability of concrete, but also leads to the instability of strength and the decrease in durability of the final structure, especially in high-dosage or fine-structure components.

[0003] (2) Existing concrete mixing technologies and equipment often struggle to meet the requirements of rapid dispersion and uniform distribution when dealing with steel fibers of different specifications, lengths, or surface treatments. On the one hand, traditional mixing processes rely heavily on passive shearing and friction between steel fibers and other aggregates, resulting in low dispersion efficiency. On the other hand, once steel fibers enter the main mixing chamber, they are mixed with a large amount of aggregates, forming a "clumping first, then dispersing" process path, which can easily lead to problems of concentrated input in a short period and difficulty in dispersing later. Especially in continuous or automated mixing processes, it is impossible to achieve precise control over the fiber delivery rhythm and distribution.

[0004] Therefore, how to provide a device to improve the uniformity of steel fiber distribution in steel fiber reinforced concrete, optimize the initial distribution of fibers, control the timing of fiber addition, and improve the uniformity of steel fiber distribution and reduce the risk of agglomeration throughout the entire process from the source to mixing has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete. By setting up a variable frequency speed-regulating feeder to achieve quantitative and constant speed feeding of fibers, and by using a combination of shearing and centrifugation to break down and separate the fibers, a buffer premixing mechanism is introduced to optimize the initial distribution. Furthermore, the device works in conjunction with the main mixing system to achieve synchronous control of the feeding rhythm. This improves the uniformity of steel fiber distribution from the source to the mixing process, reduces the risk of agglomeration, and thus solves the problem of low concrete performance caused by agglomeration and settlement.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention discloses a device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete, comprising a variable frequency speed control feeder, a shearing device, a premixing bin, and a main mixing bin arranged in sequence and connected to each other. One side of the premixing bin is connected to an aggregate quantitative conveying device, and the output side of the main mixing bin is connected to an output pipe.

[0007] Preferably, the variable frequency speed control feeder includes a feeder and a variable frequency speed control module. The feeder is located in front of the entire device and is electrically connected to the variable frequency speed control module set on one side. The feeder is connected to the subsequent shearing device through a pipeline. After the feeder is started, it outputs steel fibers evenly and continuously at a set rate and then feeds them into the shearing device.

[0008] Preferably, the aggregate quantitative conveying device includes an aggregate feeder and a feeding control module. The aggregate feeder is located on one side of the premixing bin, and the feeding control module is located between the aggregate feeder and the premixing bin, with the three connected by a pipeline. In use, the aggregate is placed or adsorbed into the aggregate feeder, and then quantitatively output to the premixing bin is controlled by the feeding control module.

[0009] Preferably, the feeding control module is connected to the bottom of the premixing bin via a pipe, and the shearing device is connected to the top of the premixing bin via a pipe.

[0010] Preferably, the premixing chamber is equipped with a spiral agitator or a pneumatic disturbance mechanism, which, when activated, premixes the delivered aggregate and fiber.

[0011] Preferably, the shearing device is a mechanical shearing and centrifugal dispersion device, mainly comprising a rotating blade and a dispersion chamber structure.

[0012] Preferably, the system also includes a sensor for monitoring the distribution of steel fibers. The sensor is mounted on the output tube and is electrically connected to the system's main controller to transmit monitoring signals.

[0013] Preferably, the operation mainly includes the following steps: Step S1: Uniform feeding of steel fibers. The variable frequency speed control module sets the feeding rate as needed, and the feeder outputs steel fibers uniformly and continuously at the set rate, which are then fed into the shearing device. Step S2, steel fiber shearing and dispersion: the steel fibers conveyed in the previous step are processed by mechanical shearing and centrifugal dispersion in the shearing device to make them into free sheet or filament state. Step S3, premixing process: the sheared and dispersed steel fibers enter the premixing bin, and the aggregate quantitative conveying device conveys the fine aggregate or powder to the bottom of the premixing bin. The steel fibers and fine aggregate or powder are premixed under the stirring of the spiral agitator or pneumatic disturbance mechanism. Step S4: After the secondary mixing operation, the pre-mixed material is transported to the main mixing chamber. The main mixing chamber, pre-mixing chamber, frequency conversion speed control module and feeding control module are linked and controlled by the main controller to keep the steel fiber feeding rhythm synchronized with the mixing rhythm. Finally, the uniformly mixed material is output to the next process through the output pipe.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are as follows: This invention is ingeniously conceived and rationally laid out. By constructing an integrated steel fiber feeding and mixing linkage system that combines "quantitative feeding - dynamic dispersion - premixing buffer - main mix output", it achieves controllable distribution of steel fibers throughout the concrete preparation process. It effectively solves the problems of fiber entanglement, uneven distribution, and stratification settlement in traditional concrete mixing. It improves the homogeneity and structural performance of concrete materials, and provides reliable equipment support and process guarantee for the engineering promotion of high-content steel fiber concrete.

[0015] This device is suitable for the dispersion of ordinary steel fibers, corrugated steel fibers and composite fibers. It can be widely used in precast components, shotcrete, high-performance concrete and other scenarios, and has good dispersion consistency and applicability. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete according to the present invention; Figure 2 This is a flowchart illustrating the working process of the device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete according to the present invention. Figure 3 The following is a physical image of the finished steel fiber reinforced concrete product for this invention.

[0018] Explanation of reference numerals in the attached diagram: 1. Feeder; 2. Variable frequency speed control module; 3. Shearing device; 4. Aggregate feeder; 5. Feeding control module; 6. Premix bin; 7. Main mixing bin; 8. Output pipe. Detailed Implementation

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] like Figure 1-3 As shown, a device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete includes a variable frequency speed-regulating feeder, a shearing device 3, a premixing bin 6, and a main mixing bin 7 arranged sequentially and connected in series. One side of the premixing bin 6 is connected to an aggregate quantitative conveying device, and the output side of the main mixing bin 7 is connected to an output pipe 8. Specifically, this device adopts a modular design and can be flexibly integrated into various precast component, high-performance concrete, and tunnel shotcrete production lines, improving adaptability and scalability.

[0021] Specifically, the variable frequency speed control feeder includes a feeder 1 and a variable frequency speed control module 2. The feeder 1 is located before the entire device and is electrically connected to the variable frequency speed control module 2 located on one side. The feeder 1 is connected to the subsequent shearing device 3 through a pipeline. After the feeder 1 is started, it outputs steel fibers evenly and continuously at a set rate, and then feeds them into the shearing device 3. In use, the feeder 1 supports adjusting the steel fiber feeding speed according to different concrete mix proportions, improving the adaptability and accuracy of the device.

[0022] Specifically, the aggregate quantitative conveying device includes an aggregate feeder 4 and a feeding control module 5. The aggregate feeder 4 is located on one side of the premixing bin 6, and the feeding control module 5 is located between the aggregate feeder 4 and the premixing bin 6, and the three are connected by a pipeline. In use, the aggregate is placed or adsorbed into the aggregate feeder 4, and then the feeding control module 5 controls the quantitative output to the premixing bin 6.

[0023] The feeding control module 5 is connected to the bottom of the premixing bin 6 via a pipe, and the shearing device 3 is connected to the top of the premixing bin 6 via a pipe.

[0024] Specifically, the premixing chamber 6 is equipped with a spiral agitator or a pneumatic agitation mechanism. After activation, the spiral agitator or pneumatic agitation mechanism premixes the delivered aggregate and fiber. The spiral agitator or pneumatic agitation mechanism maintains fiber flowability and ensures uniform premixing with the aggregate. Specifically, the outer contours of multiple agitator blades correspond to the inner cavity of the premixing chamber 6, and their dimensions are smaller than the inner diameter of the premixing chamber 6. At least one blade is a flexible plate and contacts the inner wall of the premixing chamber 6 to achieve scraping and cleaning operations, preventing material from adhering to the inner wall of the premixing chamber 6.

[0025] Specifically, the shearing device 3 employs a mechanical shearing and centrifugal dispersion mechanism, mainly comprising a rotating blade and a dispersion chamber structure. The rotating blade is driven by a motor to rotate at high speed, thereby efficiently dispersing steel fibers of different specifications or surface conditions. Specifically, this equipment can utilize existing steel fiber shearing equipment, assemble it at the corresponding workstation, and then connect it to the equipment in the preceding and following processes.

[0026] Specifically, it further includes a sensor for monitoring the distribution state of steel fibers. The sensor is installed on the output pipe 8 and is electrically connected to the total controller of the system to realize the transmission of monitoring signals. The sensor can evaluate the feeding state in real time and dynamically adjust the feeding and dispersion parameters according to the feedback. The total controller can set programs to keep the operating states of the moving parts of the steel fiber feeding signal, aggregate output, premixing and main mixing automatically synchronized, realizing the linkage of the entire device and improving the degree of automation.

[0027] The work mainly includes the following steps: Step S1: Uniform feeding of steel fibers. The variable frequency speed control module 2 sets the feeding rate as required, and the feeder 1 outputs the steel fibers evenly and continuously at the set rate and then inputs them into the shearing device 3, preventing instantaneous concentrated feeding from causing fiber agglomeration and improving the controllability of the initial distribution. Step S2: Shearing and dispersion of steel fibers. The steel fibers transported from the previous process are processed by the mechanical shearing and centrifugal dispersion device in the shearing device 3 to make them in a free sheet or filament state, significantly improving the fiber dispersion degree. Step S3: Premixing treatment operation. The sheared and dispersed steel fibers enter the premixing bin 6, and the aggregate quantitative conveying device conveys fine aggregate or powder to the bottom of the premixing bin 6. The steel fibers and the fine aggregate or powder are preliminarily premixed under the agitation of the spiral agitator or pneumatic disturbance mechanism, enhancing the fusion performance between the fibers and other raw materials and providing a good pretreatment basis for the final mixing. The design of the buffer premixing bin avoids the accumulation of steel fibers and ensures the mixing uniformity.

[0028] Step S4: Output after secondary stirring operation. The preliminarily premixed materials are conveyed into the main mixing bin 7, and through the linkage control of the main mixing bin 7, premixing bin 6, variable frequency speed control module 2 and feeding control module 5 by the total controller, the feeding rhythm of the steel fibers is synchronized with the stirring rhythm. Finally, the evenly mixed materials are output through the output pipe 8 to the next process.

[0029] Generally speaking, through the linkage control with the main stirring system, the device realizes the real-time synchronization of the feeding rhythm and stirring rhythm of the steel fibers, ensuring the uniformity, continuity and traceability of the feeding in the concrete mixing process of each batch. Moreover, the working process of the entire device has a high degree of automation and is easy to operate. Compared with the traditional method, this device significantly improves the distribution uniformity and engineering adaptability of the steel fibers in the steel fiber concrete.

[0030] 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 a process, method, article, or apparatus.

[0031] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete, characterized in that: It includes a variable frequency speed control feeder, a shearing device (3), a premix bin (6) and a main mixing bin (7) arranged in sequence and connected to each other. One side of the premix bin (6) is connected to an aggregate quantitative conveying device, and the output side of the main mixing bin (7) is connected to an output pipe (8).

2. The device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete according to claim 1, characterized in that: The variable frequency speed control feeder includes a feeder (1) and a variable frequency speed control module (2). The feeder (1) is located in front of the whole device and is electrically connected to the variable frequency speed control module (2) set on one side. The feeder (1) is connected to the subsequent shearing device (3) through a pipe. After the feeder (1) is started, it outputs steel fibers evenly and continuously at a set rate and then puts them into the shearing device (3).

3. The device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete according to claim 2, characterized in that: The aggregate quantitative conveying device includes an aggregate feeder (4) and a feeding control module (5). The aggregate feeder (4) is located on one side of the premixing bin (6), and the feeding control module (5) is located between the aggregate feeder (4) and the premixing bin (6), and the three are connected by a pipeline. When in use, the aggregate is placed or adsorbed into the aggregate feeder (4), and then the feeding control module (5) controls the quantitative output to the premixing bin (6).

4. The device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete according to claim 3, characterized in that: The feeding control module (5) is connected to the bottom of the premix bin (6) through a pipe, and the shearing device (3) is connected to the top of the premix bin (6) through a pipe.

5. The device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete according to claim 4, characterized in that: The premixing chamber (6) is equipped with a spiral agitator or a pneumatic disturbance mechanism. After the spiral agitator or pneumatic disturbance mechanism is started, it will premix the aggregate and fiber that are delivered.

6. The device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete according to claim 1, characterized in that: The shearing device (3) adopts a mechanical shearing and centrifugal dispersion device, mainly including a rotating blade and a dispersion chamber structure.

7. The device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete according to claim 1, characterized in that: It also includes a sensor for monitoring the distribution of steel fibers. The sensor is installed on the output tube (8) and is electrically connected to the system's main controller to realize the transmission of monitoring signals.

8. The device for improving the uniformity of steel fiber distribution in steel fiber reinforced concrete according to claim 5, characterized in that: The work mainly includes the following steps: Step S1, uniform feeding of steel fibers: the variable frequency speed control module (2) sets the feeding rate as needed, and the feeder (1) outputs steel fibers uniformly and continuously at the set rate, and then feeds them into the shearing device (3). Step S2, steel fiber shearing and dispersion: the steel fibers conveyed in the previous step are processed by mechanical shearing and centrifugal dispersion device in the shearing device (3) to make them into free sheet or filament state. Step S3, premixing process: the sheared and dispersed steel fibers enter the premixing bin (6), and the aggregate quantitative conveying device conveys the fine aggregate or powder to the bottom of the premixing bin (6). The steel fibers and fine aggregate or powder are premixed under the stirring of the spiral agitator or pneumatic disturbance mechanism. Step S4, after the secondary mixing operation, the pre-mixed material is transported to the main mixing chamber (7). The main mixing chamber (7), premixing chamber (6), frequency conversion speed control module (2) and feeding control module (5) are linked by the main controller to keep the steel fiber feeding rhythm synchronized with the mixing rhythm. Finally, the uniformly mixed material is output to the next process through the output pipe (8).

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