A raw material proportioning and mixing device for the production of porous refractory castables

Abstract

This utility model discloses a raw material proportioning and mixing device for the production of porous refractory castables, including a main mixing cylinder and a pre-mixing cylinder. The pre-mixing cylinder is located at the top of the main mixing cylinder, and a regulating valve is fixedly installed between the main mixing cylinder and the pre-mixing cylinder. A binder atomizing sprayer is fixedly connected to the top of the main mixing cylinder, and a discharge port is fixedly connected to the bottom of the main mixing cylinder. A discharge valve is fixedly installed inside the discharge port. This utility model adopts a two-stage mixing structure design of "pre-mixing + high-speed shearing". First, a scraper-type mixing component driven by a slow motor is used to gently pre-mix the dry materials. Then, a multi-stage mixing component controlled by a variable frequency motor is used to achieve high-speed homogenization. The stirring blades generate radial flow to achieve macro-mixing, and the anchor blades form axial flow to enhance micro-homogenization. Combined with the timed binder atomizing sprayer, gradient mixing of solid and liquid components is achieved, effectively avoiding the problems of excessive particle breakage and local enrichment of binder in traditional mixing.

Description

Technical Field

[0001] This utility model relates to the technical field of mixing devices, specifically a raw material proportioning and mixing device for the production of porous refractory castables. Background Technology

[0002] A mixing device is a crucial piece of equipment used in the production of porous refractory castables, responsible for uniformly mixing various raw materials. As a vital material for high-temperature industrial furnaces, the quality of porous refractory castables directly affects the service life and thermal performance of the furnace body. Through a scientifically designed mixing method, the mixing device ensures the uniform dispersion of all components in the refractory material, effectively reducing porosity and defects in the finished product, thereby improving the density and heat resistance of the castable.

[0003] When traditional mixing devices (such as paddle and spiral mixers) are used in the production of porous refractory castables, the large density difference between lightweight aggregates (such as hollow alumina spheres) and fine powders (such as silica fume) makes it difficult for the flow field generated by conventional mixing to overcome the tendency of particle segregation, resulting in poor mixing uniformity. On the other hand, when high-speed mixing is used to improve the mixing effect, shear force will destroy the pore structure of porous aggregates. This not only reduces the thermal insulation performance of the finished product, but also changes the particle size distribution due to the fine particles generated by aggregate crushing, affecting the construction rheology and high-temperature strength of the castable. Utility Model Content

[0004] The purpose of this invention is to provide a raw material proportioning and mixing device for the production of porous refractory castables, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a raw material proportioning and mixing device for producing porous refractory castables, comprising a main mixing cylinder and a pre-mixing cylinder, wherein a pre-mixing cylinder is provided at the top of the main mixing cylinder, a regulating valve is fixedly installed between the main mixing cylinder and the pre-mixing cylinder, a binder atomizing sprayer is fixedly connected to the top of the main mixing cylinder, a discharge port is fixedly connected to the bottom of the main mixing cylinder, a discharge valve is fixedly installed inside the discharge port, a mixing component is provided inside the main mixing cylinder, a mixing component is provided inside the pre-mixing cylinder, a dry material inlet is fixedly connected to the top of the pre-mixing cylinder, and a support ring is fixedly connected to the outside of the main mixing cylinder.

[0006] As a further preferred embodiment of this technical solution, the mixing component includes a main shaft, which is rotatably connected to the top of the inner wall of the main mixing cylinder. A stirring blade is fixedly connected to the outer side of the middle section of the main shaft, and an anchor-type blade is fixedly connected to the outer side of the lower section of the main shaft.

[0007] As a further preferred embodiment of this technical solution, the stirring assembly includes an auxiliary shaft, which is rotatably connected to the top of the inner wall of the pre-stirring cylinder. A stirring rod is fixedly connected to the outer side of the auxiliary shaft, and a scraper is fixedly connected to the end of the stirring rod away from the auxiliary shaft. One side of the scraper is in contact with the inner wall of the pre-stirring cylinder.

[0008] As a further preferred embodiment of this technical solution, a variable frequency motor is fixedly installed on the top of the main mixing drum, and the output end of the variable frequency motor extends into the interior of the main mixing drum and is fixedly connected to the main shaft.

[0009] As a further preferred embodiment of this technical solution, a slow-speed motor is fixedly installed on the top of the pre-stirring cylinder, and the output end of the slow-speed motor extends into the interior of the pre-stirring cylinder and is fixedly connected to the auxiliary shaft.

[0010] As a further preferred embodiment of this technical solution, a connecting mounting plate is fixedly connected between the outer sides of the main mixing cylinder and the pre-stirring cylinder, and a CNC display is fixedly mounted on the outer side of the connecting mounting plate.

[0011] As a further preferred embodiment of this technical solution, an air compressor is fixedly installed on the top of the main mixing cylinder, and the output end of the air compressor extends into the interior of the main mixing cylinder.

[0012] This utility model provides a raw material proportioning and mixing device for the production of porous refractory castables, which has the following beneficial effects: (1) This utility model adopts a two-stage stirring structure design of "premixing + high-speed shearing". First, the dry material is gently premixed by the scraper stirring component driven by the slow motor. Then, the high-speed homogenization is achieved by the multi-stage mixing component controlled by the variable frequency motor. The stirring blade generates radial flow to achieve macro-mixing, and the anchor blade forms axial flow to enhance micro-homogenization. Combined with the timed opening binder atomizing sprayer, the gradient mixing of solid and liquid components is achieved, which effectively avoids the problems of excessive particle breakage and local enrichment of binder in traditional stirring.

[0013] (2) Through the integrated design of air compressor system and main mixing drum, this utility model can inject pulse compressed air of 0.2-0.5MPa according to the preset program during the mixing process. After the airflow is accelerated twice by specially designed stirring blades, a turbulent field is formed, which can effectively break up the raw material agglomeration and promote the dispersion of micron-level fine powder. At the same time, with the arc structure design of the drum wall, the material forms a three-dimensional swirling motion, which can reduce a certain amount of mixing dead angles compared with traditional stirring methods. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a bottom view of the structure of this utility model; Figure 3 This is a schematic diagram of a half-section of the present invention; Figure 4 This is a schematic diagram of the mixing and stirring structure of this utility model; In the diagram: 1. Main mixing drum; 2. Pre-mixing drum; 3. Connecting mounting plate; 4. CNC display; 5. Binder atomizing sprayer; 6. Dry material inlet; 7. Variable frequency motor; 8. Slow speed motor; 9. Discharge port; 10. Regulating valve; 11. Main shaft; 12. Mixing blade; 13. Anchor blade; 14. Auxiliary shaft; 15. Mixing rod; 16. Scraper; 17. Discharge valve; 18. Air compressor; 19. Support ring. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0016] This utility model provides a technical solution: such as Figures 1-4 As shown in this embodiment, a raw material proportioning and mixing device for producing porous refractory castable includes a main mixing cylinder 1 and a pre-mixing cylinder 2. The pre-mixing cylinder 2 is provided at the top of the main mixing cylinder 1. A regulating valve 10 is fixedly installed between the main mixing cylinder 1 and the pre-mixing cylinder 2. A binder atomizing sprayer 5 is fixedly connected to the top of the main mixing cylinder 1. A discharge port 9 is fixedly connected to the bottom of the main mixing cylinder 1. A discharge valve 17 is fixedly installed inside the discharge port 9. A mixing component is provided inside the main mixing cylinder 1. A mixing component is provided inside the pre-mixing cylinder 2. A dry material inlet 6 is fixedly connected to the top of the pre-mixing cylinder 2. A support ring 19 is fixedly connected to the outside of the main mixing cylinder 1. A connecting mounting plate 3 is fixedly connected between the outside of the main mixing cylinder 1 and the pre-mixing cylinder 2. A CNC display 4 is fixedly installed on the outside of the connecting mounting plate 3. An air compressor 18 is fixedly installed at the top of the main mixing cylinder 1. The output end of the air compressor 18 extends into the interior of the main mixing cylinder 1.

[0017] When using the mixing device, first connect the main body of the device to an external power source to power the entire device. Then, feed the dry material through the dry material inlet 6 at the top of the pre-mixing drum 2, and the mixing components pre-mix the dry material. The pre-mixed material enters the main mixing drum 1 through the flow control valve 10, while the binder atomizer sprayer 5 sprays the liquid binder evenly in atomized form. The compressed air output from the air compressor 18 assists the mixing components in three-dimensional mixing of the materials, ensuring thorough combination of dry and wet materials. The CNC display 4 (the acquisition end of the CNC display 4 extends into the interior of the main mixing drum 1, such as humidity and temperature sensors) monitors and adjusts the mixing parameters in real time. Finally, the mixed castable is discharged through the bottom discharge valve 17. This device achieves high uniformity mixing of porous refractory castable raw materials through the synergistic effect of pre-mixing, atomizing spraying, and air-assisted mixing.

[0018] likeFigures 1-4 As shown, the mixing assembly includes a main shaft 11, which is rotatably connected to the top of the inner wall of the main mixing cylinder 1. A stirring blade 12 is fixedly connected to the outer side of the middle section of the main shaft 11, and an anchor blade 13 is fixedly connected to the outer side of the lower section of the main shaft 11. A variable frequency motor 7 is fixedly installed on the top of the main mixing cylinder 1, and the output end of the variable frequency motor 7 extends into the interior of the main mixing cylinder 1 and is fixedly connected to the main shaft 11.

[0019] After the variable frequency motor 7 is started, it drives the main shaft 11 to rotate at high speed, which drives the stirring blades 12 and anchor blades 13 arranged in sections on the outside to rotate synchronously. The upper stirring blades 12 perform radial shearing and diffusion of the powdery raw materials in the main mixing cylinder 1, while the lower anchor blades 13 move circumferentially close to the cylinder wall, eliminating dead corner deposition through the wall scraping effect. The composite vortex field formed by the two sets of blades enables the lightweight aggregate, binder and additives to achieve forced convection in three-dimensional space, and finally achieves high homogeneous mixing of multi-component refractory raw materials.

[0020] like Figures 1-4 As shown, the stirring assembly includes an auxiliary shaft 14, which is rotatably connected to the top of the inner wall of the pre-stirring drum 2. A stirring rod 15 is fixedly connected to the outer side of the auxiliary shaft 14. A scraper 16 is fixedly connected to the end of the stirring rod 15 away from the auxiliary shaft 14. One side of the scraper 16 is in contact with the inner wall of the pre-stirring drum 2. A slow-speed motor 8 is fixedly installed on the top of the pre-stirring drum 2. The output end of the slow-speed motor 8 extends into the interior of the pre-stirring drum 2 and is fixedly connected to the auxiliary shaft 14.

[0021] By starting the slow-speed motor 8 at the top of the pre-mixing drum 2, the auxiliary shaft 14 is driven to rotate at a low speed, which in turn drives the stirring rod 15 fixed to the outside of the auxiliary shaft 14 to make a circular motion. At the same time, the scraper 16 connected to the end of the stirring rod 15 rotates synchronously. The scraper 16 always keeps in contact with the inner wall of the pre-mixing drum 2 during the rotation process, so as to realize the function of stirring and scraping off the material adhering to the inner wall at the same time. The stirring rod 15 gently mixes the refractory raw materials in the drum at a low speed, avoiding the destruction of the porous structure caused by high-speed stirring. The continuous low-speed stirring controlled by the slow-speed motor 8 ensures that the aggregate and binder and other components are evenly dispersed, and finally a homogeneous castable premix that meets the porosity requirements is formed.

[0022] This utility model provides a raw material proportioning and mixing device for the production of porous refractory castables. The specific working principle is as follows: After the device is powered on, dry material is fed in through the dry material inlet 6 at the top of the pre-mixing drum 2. A slow-speed motor 8 drives the auxiliary shaft 14, which in turn drives the mixing rod 15 and scraper 16 to rotate at low speed, gently mixing the raw materials while scraping off the material adhering to the drum wall to form a homogeneous premix. After the premix is ​​quantitatively fed into the main mixing drum 1 through the regulating valve 10, the binder atomizer sprayer 5 simultaneously atomizes and sprays the liquid binder into the drum. At the same time, the air compressor 18 injects compressed air into the drum. Meanwhile, the frequency converter... Motor 7 drives main shaft 11 to rotate at high speed, driving stirring blades 12 to perform radial shearing and diffusion, while anchor blades 13 move close to the cylinder wall to perform circumferential scraping. With the assistance of compressed air, a three-dimensional mixing flow field is formed, enabling forced convection of lightweight aggregates, binders and additives. The CNC display 4 monitors parameters such as temperature and humidity in real time through built-in sensors and automatically adjusts the stirring intensity and material flow rate. Finally, the uniformly mixed porous castable is output through the bottom discharge valve 17, realizing efficient and homogenized production throughout the entire process from dry material premixing, atomization humidification to air-assisted three-dimensional mixing.

[0023] 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 raw material proportioning and mixing device for producing porous refractory castables, comprising a main mixing cylinder (1) and a pre-mixing cylinder (2), characterized in that: The main mixing cylinder (1) is provided with a pre-stirring cylinder (2) at the top. A regulating valve (10) is fixedly installed between the main mixing cylinder (1) and the pre-stirring cylinder (2). A binder atomizing sprayer (5) is fixedly connected to the top of the main mixing cylinder (1). A discharge port (9) is fixedly connected to the bottom of the main mixing cylinder (1). A discharge valve (17) is fixedly installed inside the discharge port (9). A mixing component is provided inside the main mixing cylinder (1). A stirring component is provided inside the pre-stirring cylinder (2). A dry material inlet (6) is fixedly connected to the top of the pre-stirring cylinder (2). A support ring (19) is fixedly connected to the outside of the main mixing cylinder (1).

2. The raw material proportioning and mixing device for producing porous refractory castables according to claim 1, characterized in that: The mixing assembly includes a main shaft (11), which is rotatably connected to the top of the inner wall of the main mixing cylinder (1). A stirring blade (12) is fixedly connected to the outer side of the middle section of the main shaft (11), and an anchor blade (13) is fixedly connected to the outer side of the lower section of the main shaft (11).

3. The raw material proportioning and mixing device for producing porous refractory castables according to claim 1, characterized in that: The stirring assembly includes an auxiliary shaft (14), which is rotatably connected to the top of the inner wall of the pre-stirring cylinder (2). A stirring rod (15) is fixedly connected to the outside of the auxiliary shaft (14). A scraper (16) is fixedly connected to one end of the stirring rod (15) away from the auxiliary shaft (14). One side of the scraper (16) is in contact with the inner wall of the pre-stirring cylinder (2).

4. The raw material proportioning and mixing device for producing porous refractory castables according to claim 2, characterized in that: A variable frequency motor (7) is fixedly installed on the top of the main mixing cylinder (1), and the output end of the variable frequency motor (7) extends into the interior of the main mixing cylinder (1) and is fixedly connected to the main shaft (11).

5. The raw material proportioning and mixing device for producing porous refractory castables according to claim 3, characterized in that: A slow motor (8) is fixedly installed on the top of the pre-stirring cylinder (2), and the output end of the slow motor (8) extends into the interior of the pre-stirring cylinder (2) and is fixedly connected to the auxiliary shaft (14).

6. The raw material proportioning and mixing device for producing porous refractory castables according to claim 1, characterized in that: A connecting mounting plate (3) is fixedly connected between the outer side of the main mixing cylinder (1) and the pre-stirring cylinder (2), and a numerical control display (4) is fixedly installed on the outer side of the connecting mounting plate (3).

7. The raw material proportioning and mixing device for producing porous refractory castables according to claim 1, characterized in that: An air compressor (18) is fixedly installed on the top of the main mixing cylinder (1), and the output end of the air compressor (18) extends into the interior of the main mixing cylinder (1).

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