Controllable mixing device for low-strength material production

Abstract

The utility model relates to the field of mixing devices, and particularly discloses a controllable mixing device for low-strength material production, which comprises a mixing mechanism, the mixing mechanism comprises a mixing tank, a mixing rod and a conveying mechanism, the conveying mechanism comprises a conveying barrel and a spiral conveying rod, one end of the conveying barrel facing the mixing tank is inclined upwards, and the other end of the conveying barrel faces the spiral conveying rod. A feeding port and a discharging port are formed in the conveying barrel, a water inlet and a finished product outlet are formed in the mixing tank, the discharging port, the water inlet and the finished product outlet are all communicated with an inner cavity of the mixing tank, the mixing rod comprises a transmission rod and a plurality of mixing blades located on the outer wall of the transmission rod, the mixing blades are arc-shaped plate blades, and the mixing blades are of an inclined structure. The inclined arc-shaped plate blades can generate strong shearing, convection and diffusion effects during rotation, so that materials with different components are uniformly mixed within a short time, the component consistency of the controllable low-strength materials is ensured, and the mixing efficiency can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of mixing devices, and particularly relates to a mixing device for producing controllable low-strength materials. Background Technique

[0002] Controllable low-strength material is a kind of cementitious backfill material with extremely high fluidity. It can self-fill without any external force under the action of its own weight, and its 28-day unconfined compressive strength is not higher than 8.3 Mpa but greater than 0.3 Mp. According to whether it is excavated later, it is divided into excavable CLSM and non-excavable CLSM with 2.1 Mpa as the boundary.

[0003] When the existing controllable low-strength materials are produced, the raw materials are usually input into a mixing tank and mixed in the mixing tank. The existing mixing tanks usually include a transmission shaft and mixing blades fixed on the transmission shaft. The mixing blades are set as flat plate-like structures or spiral structures. The blades with flat plate-like structures generate less eddy current and shear force when mixing the materials in the mixing tank. In order to achieve a certain mixing effect, it may take a longer time for mixing, resulting in lower production efficiency and lower practicability. Due to the limitation of the blade size of the spiral structure, it can usually only be installed in equipment with a smaller diameter, and the mixing effect on materials with greater resistance will be relatively low. In order to achieve an ideal mixing effect, it may take a longer time or higher power, and the production process of the mixing blades with spiral structure is complex and the cost is high.

[0004] An existing mixing tank for secondary addition of concrete admixtures with the patent application number CN201810594929.X includes a tank body and a motor arranged outside the tank body. The tank body is divided into an upper tank body and a lower tank body. The motor is linked with a rotating shaft extending into the tank body. Small blades and large blades are arranged on the rotating shaft and are respectively located in the upper tank body and the lower tank body. The rotation of the large blades prevents the concrete from cooling and solidifying, and the rotation of the small blades improves the mixing efficiency of the admixtures. There is no detailed description and limitation on the blades in this scheme. It can be clearly seen from the attached Figure 1 that both the small blades and the large blades are flat plate-like structures, and the eddy current and shear force generated when stirring the materials in the mixing tank are small, and the stirring effect is low. Summary of the Utility Model

[0005] The utility model provides a mixing device for producing controllable low-strength materials to solve the technical problems of low production efficiency and low stirring effect in the prior art.

[0006] To solve the above problems, the mixing device for producing controllable low-strength materials provided by the utility model adopts the following technical scheme:

[0007] A mixing device for producing controllable low-strength materials, including a mixing mechanism. The mixing mechanism includes a mixing tank and a mixing rod. It also includes a conveying mechanism. The conveying mechanism includes a conveying barrel and a spiral conveying rod. One end of the conveying barrel facing the mixing tank is inclined upward. The conveying barrel is provided with a feed inlet and a discharge outlet. The mixing tank is provided with a water inlet and a finished product outlet. The discharge outlet, the water inlet, and the finished product outlet are all communicated with the inner cavity of the mixing tank. The mixing rod includes a transmission rod and a number of mixing blades located on the outer wall of the transmission rod. The mixing blades are set as arc-shaped plate blades, and the mixing blades are set as an inclined structure.

[0008] The beneficial effects of the mixing device for producing controllable low-strength materials provided by the present utility model are as follows: The inclined arc-shaped plate blades can generate strong shearing, convection, and diffusion effects during rotation, enabling materials of different components to achieve uniform mixing in a short time, ensuring the composition consistency of the controllable low-strength materials, effectively improving the mixing efficiency, and having a relatively low production cost; The raw materials enter the conveying barrel from the feed inlet and are sent into the mixing tank along the inclined upward conveying barrel through the push of the spiral conveying rod, eliminating the need for frequent manual addition of raw materials and improving the production efficiency.

[0009] Further, the central axis of the spiral conveying rod coincides with the central axis of the conveying barrel, the central axis of the mixing rod coincides with the central axis of the mixing tank, and the mixing rod is longitudinally installed.

[0010] Further, the arc curve of the mixing blade is a minor arc, the inclination angle ∠1 of the mixing blade is (60 - 80)°, and one side of the bottom of the mixing blade is inclined downward along the rotation direction of the transmission rod.

[0011] Further, the bottom end face of the mixing tank includes two inclined surfaces symmetric about the central axis of the mixing tank. The inclined surfaces are inclined downward along the end towards the mixing rod, so that the bottom end face of the mixing tank has a funnel-shaped structure, and the finished product outlet is located on the inclined surface.

[0012] Further, the feed inlet is set as a funnel-shaped structure, and the feed inlet is located at one end of the conveying barrel away from the mixing tank.

[0013] Further, the spiral stirring rod includes a stirring shaft and blades spirally distributed along the outer wall of the stirring shaft. The radius of the inner cavity of the conveying barrel is set as R, the distance from the outer wall of the stirring shaft to the inner wall of the conveying barrel is L1, and the minimum distance from the blade to the inner wall of the conveying barrel is L2. The ratio of R:L1:L2 is 1:(0.6 - 0.8):(0.1 - 0.2).

[0014] Further, the inclination angle ∠2 of the conveying barrel is set as (30 - 50)°. Description of the Drawings

[0015] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understandable. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0016] Figure 1 is a schematic structural diagram of a mixing device for producing a controllable low-strength material according to the present utility model;

[0017] Figure 2 is a partial structural diagram of a transmission rod and a mixing blade of a mixing device for producing a controllable low-strength material according to the present utility model;

[0018] Figure 3 is a partial structural diagram of a conveying mechanism of a mixing device for producing a controllable low-strength material according to the present utility model.

[0019] Description of reference numerals:

[0020] 1. Mixing mechanism; 11. Mixing tank; 111. Water inlet; 112. Finished product outlet; 113. Inclined surface; 12. Mixing rod; 121. Transmission rod; 122. Mixing blade;

[0021] 2. Conveying mechanism; 21. Conveying barrel; 211. Feed inlet; 212. Discharge outlet; 22. Screw conveyor; 221. Stirring shaft; 222. Paddle. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Those skilled in the art should know that the embodiments described below are a part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts fall within the protection scope of the present utility model.

[0023] The number of any element in the drawings is for illustration rather than limitation, and any naming is only for distinction and does not have any limiting meaning.

[0024] Next, with reference to several representative embodiments of the present utility model, the principles and spirits of the present utility model will be elaborated in detail.

[0025] A mixing device for producing a controllable low-strength material provided by the present utility model, as Figures 1 to 3As shown in the figure, it includes a mixing mechanism 1 and a conveying mechanism 2. The mixing mechanism 1 includes a mixing tank 11 and a mixing rod 12. The conveying mechanism 2 includes a conveying barrel 21 and a spiral conveying rod 22. The conveying barrel 21 is provided with a feed inlet 211 and a discharge outlet 212. The mixing tank 11 is provided with a water inlet 111 and a finished product outlet 112. The discharge outlet 212, the water inlet 111, and the finished product outlet 112 are all in communication with the inner cavity of the mixing tank 11. Raw materials enter the conveying barrel 21 from the feed inlet 211 and are sent into the mixing tank 11 along the conveying barrel 21 by the push of the spiral conveying rod 22 for stirring and mixing.

[0026] In this embodiment, when the mixing device is used, first weigh the dried lithium slag, shield muck, fly ash, quicklime, and polycarboxylate superplasticizer according to the formula ratio and input them into the mixing tank 11 through the conveying mechanism 2. After stirring for 2 - 3 minutes, add water into the mixing tank 11 and stir again for 3 - 5 minutes to make the dry materials fully contact with water to form a uniform flowable slurry, which is the controlled low-strength material. The fluidity is greater than 180 mm, the bleeding rate is about 5%, and the 28-day strength is 0.3 - 8.0 Mpa. Among them, the lithium slag is dried, highly crushed, and screened to less than 100 meshes. The main components of the lithium slag are SiO 2 、Al 2 O 3 、K 2 O、Na 2 O、CaO、MgO、Fe 2 O 3 , the fly ash accounts for 0 - 30% of the total mass of the lithium slag, the quicklime accounts for 10 - 20% of the total mass of the lithium slag, the superplasticizer accounts for 0.2% - 0.5% of the total mass of the lithium slag, and the water accounts for 20% - 30% of the total mass of all the above solid components. The water is directly introduced into the mixing tank through the water inlet 111.

[0027] In this embodiment, the mixing rod 12 includes a transmission rod 121 and a number of mixing blades 122 located on the outer wall of the transmission rod 121. The mixing blades 122 are set as arc-shaped plate blades, and the mixing blades 122 are set as an inclined structure. The inclined arc-shaped plate blades can generate strong shearing, convection, and diffusion effects during rotation, enabling materials of different components to be evenly mixed in a short time, ensuring the composition consistency of the controlled low-strength material, and effectively improving the mixing efficiency. In this embodiment, a number of mixing blades 122 are evenly distributed along the longitudinal direction of the transmission rod 121. The mixing blades 122 include two groups, and the two groups of mixing blades 122 are respectively located on both sides of the transmission rod 121. It should be noted that the inclined directions and arc curve directions of the two groups of mixing blades 122 are the same.

[0028] It should be noted that a minor arc refers to the part between any two points on a circle, and the central angle subtended by these two points is less than 180°. In this embodiment, the arc curve of the mixing blade 122 is a minor arc, which can generate a stronger shearing force and convection effect when the mixing blade 122 rotates, helping the materials to form a more complex flow pattern in the mixing tank 11, increasing the contact opportunities between the materials, thereby improving the mixing efficiency. The curve shape of the minor arc can also reduce the accumulation and blockage of materials on the mixing blade 122, maintaining the smooth operation of the equipment; in this embodiment, the inclination angle ∠1 of the mixing blade 122 is (60 - 80)°, and one side at the bottom of the mixing blade 122 inclines downward along the rotation direction of the transmission rod 121. In this embodiment, the inclination angle ∠1 of the mixing blade 122 is 70°, which can increase the pushing effect and shearing force of the mixing blade 122 on the materials during rotation, and can further make the mixing blade 122 generate a stronger shearing force and convection effect during rotation, helping the materials to achieve more uniform mixing in the mixing tank 11.

[0029] In this embodiment, the central axis of the screw conveyor rod 22 coincides with the central axis of the conveying barrel 21, and the central axis of the mixing rod 12 coincides with the central axis of the mixing tank 11. The mixing rod 12 is longitudinally installed, which can reduce energy waste and unnecessary mechanical stress, thereby improving the overall efficiency of the equipment, and can ensure that the materials are more fully mixed, improving the mixing quality. In this embodiment, drive motors are provided outside both the conveying barrel 21 and the mixing tank 11, and the two drive motors are respectively linked to the mixing rod 12 and the screw conveyor rod 22, so that the mixing rod 12 and the screw conveyor rod 22 rotate about their central axes.

[0030] In this embodiment, one end of the conveying barrel 21 facing the mixing tank 11 inclines upward, and the inclination angle ∠2 of the conveying barrel 21 is set to (30 - 50)°, as Figure 2 shown. In this embodiment, the inclination angle ∠2 of the conveying barrel 21 is set to 40°. This inclination angle provides an appropriate rising speed and stability for the materials, helping to improve the conveying efficiency.

[0031] In this embodiment, the screw stirring rod includes a stirring shaft 221 and blades 222 spirally distributed along the outer wall of the stirring shaft 221. The radius of the inner cavity of the conveying barrel 21 is set to R, the distance between the outer wall of the stirring shaft 221 and the inner wall of the conveying barrel 21 is L1, and the minimum distance between the blades 222 and the inner wall of the conveying barrel 21 is L2. The ratio of R:L1:L2 is 1:(0.6 - 0.8):(0.1 - 0.2), as Figure 3As shown, in this embodiment, R:L1:L2 is 1:0.7:0.14. L1 is set to be between 0.6 and 0.8 times of R, so that there is enough space between the stirring shaft 221 and the inner wall of the conveying barrel 21 to ensure smooth flow of the material. L2 is set to be between 0.1 and 0.2 times of R, so that the paddle 222 can fully contact the material during rotation, and at the same time, it is ensured that the paddle 222 will not scrape or block the inner wall of the conveying barrel 21 during the stirring process. By setting a reasonable ratio of R:L1:L2, the structure of the entire spiral stirring rod and the conveying barrel 21 is optimized, and the spatial relationship among the stirring shaft 221, the paddle 222 and the conveying barrel 21 is more reasonable, which helps to improve the stirring efficiency and the smoothness of material conveying.

[0032] In this embodiment, the bottom end face of the mixing tank 11 includes two inclined surfaces 113 that are symmetric about the central axis of the mixing tank 11. The inclined surfaces 113 slope downward towards the end of the mixing rod 12, so that the bottom end face of the mixing tank 11 has a funnel-shaped structure. The finished product outlet 112 is located on the inclined surface 113, so that the material can slide more naturally along the inclined surface inside the mixing tank 11, increasing the relative movement between the materials. And because the inclined surfaces 113 slope downward towards the end of the mixing rod 12, the mixing rod 12 can more effectively push the material from the center to the edge and then back from the edge to the center during the stirring process, forming a cyclic mixing path, which helps to promote the mixing between the materials, can effectively improve the mixing efficiency, and the funnel-shaped bottom end face design enables the material to flow more smoothly to the finished product outlet 112 after mixing, can effectively reduce the accumulation and blockage of the material at the bottom, and improves the discharging efficiency and stability.

[0033] In this embodiment, the feed inlet 211 is set to a funnel-shaped structure. The feed inlet 211 is located at one end of the conveying barrel 21 away from the mixing tank 11, which can guide the material to smoothly enter the conveying barrel 21 and can effectively avoid the accumulation or bridging of the material during the feeding process.

[0034] According to the above description of this specification, those skilled in the art can also understand the following terms used, such as the terms indicating the orientation or position relationship, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer", etc., are based on the orientation or position relationship shown in the drawings of this specification. It is only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in the specific orientation. Therefore, the above terms of orientation or position relationship cannot be understood or interpreted as a limitation to the solution of the present invention.

[0035] In addition, in the description of this specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise specifically defined.

Claims

1. A mixing device for producing controllable low-strength materials, comprising a mixing mechanism, the mixing mechanism comprising a mixing tank and a mixing rod, characterized in that: It also includes a conveying mechanism, which includes a conveying barrel and a spiral conveying rod. The conveying barrel is inclined upward toward one end of the mixing tank. The conveying barrel is provided with a feed inlet and a discharge outlet. The mixing tank is provided with a water inlet and a finished product outlet. The discharge inlet, the water inlet and the finished product outlet are all interconnected with the inner cavity of the mixing tank. The mixing rod includes a transmission rod and a plurality of mixing leaves located on the outer wall of the transmission rod. The mixing leaves are arranged as arc-shaped plate blades, and the mixing leaves are arranged as an inclined structure. The arc curve of the mixing blade is a minor arc, the inclination angle ∠1 of the mixing blade is (60-80)°, and one side of the bottom of the mixing blade is inclined downward along the rotation direction of the transmission rod; The spiral stirring rod includes a stirring shaft and blades spirally distributed along the outer wall of the stirring shaft. The radius of the inner cavity of the conveying barrel is set to R, the distance between the outer wall of the stirring shaft and the inner wall of the conveying barrel is L1, the minimum distance between the blades and the inner wall of the conveying barrel is L2, and R:L1:L2 is 1:(0.6-0.8):(0.1-0.2).

2. A mixing device for producing controllable low-strength materials according to claim 1, characterized in that The central axis of the spiral conveying rod coincides with the central axis of the conveying barrel, the central axis of the mixing rod coincides with the central axis of the mixing tank, and the mixing rod is installed longitudinally.

3. A mixing device for producing controllable low-strength materials according to claim 2, characterized in that The bottom end surface of the mixing tank includes two sets of inclined surfaces symmetrical about the central axis of the mixing tank. The inclined surfaces are inclined downward along one end toward the mixing rod, so that the bottom end surface of the mixing tank is a funnel-shaped structure, and the finished product outlet is located on the inclined surface.

4. A mixing device for producing controllable low-strength materials according to any one of claims 1 to 3, characterized in that The feed port is set as a funnel-shaped structure, and the feed port is located at the end of the conveying barrel away from the mixing tank.

5. A mixing device for producing controllable low-strength materials according to any one of claims 1 to 3, characterized in that: The inclination angle ∠2 of the conveying barrel is set to (30-50)°.

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