Mud mixing device for magnesia carbon brick production
By using a magnetically driven guide rod and stirring rod design, the problems of limited stirring range and uneven mixing in the production of magnesia-carbon bricks are solved, achieving efficient and uniform mixing of magnesia-carbon brick slurry and reducing equipment failure rate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-28
- Publication Date
- 2026-03-31
AI Technical Summary
Traditional mixing equipment has problems such as limited mixing range, uneven mixing, and easy material smearing on the mixing rod in the production of magnesia-carbon bricks, especially for viscous materials, resulting in low mixing efficiency.
The design employs a magnetically driven guide rod and stirring rod. The stirring rod moves in the opposite direction through the interaction of a permanent magnet and an electromagnet. Combined with a gear and rack transmission assembly, the stirring rod reciprocates up and down, expanding the mixing range and eliminating dead zones in the mixing process.
It achieves thorough mixing of magnesia-carbon brick slurry, improves mixing uniformity, reduces equipment failure rate and maintenance costs, and is suitable for efficient mixing of viscous materials.
Smart Images
Figure CN224060119U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of magnesia-carbon brick production technology, and in particular to a mud mixing device for magnesia-carbon brick production. Background Technology
[0002] In the production process of magnesia-carbon bricks, the mixing of clay is one of the most important steps. Clay typically contains magnesia particles, graphite powder, metal additives (such as aluminum powder and silicon powder), and liquid or solid binders (such as phenolic resin). These raw materials need to be fully and uniformly mixed to ensure that the final brick blank has a uniform composition and dense structure, thereby guaranteeing its performance.
[0003] However, due to the high viscosity, large particle density differences (e.g., high density of magnesia sand and low density of graphite), and easy adhesion of binders in magnesia-carbon brick mortar, traditional mixing equipment has many problems in practical applications: First, the mixing range is limited, especially for vertical mixing equipment, where the mixing paddle is usually fixed on the rotating shaft and can only rotate and mix at a fixed height, resulting in insufficient material exchange between the upper and lower layers in the mixing tank and easy to create mixing dead zones; Second, for viscous materials, the mixing paddle is prone to material entrapment, that is, the material adheres to the mixing rod and rotates with it, while its own relative movement is small, reducing the mixing efficiency.
[0004] Therefore, developing a mixing device with a relatively simple structure, a large mixing range, high mixing uniformity, and suitable for viscous slurry of magnesia-carbon bricks is of great significance for improving the product quality and production efficiency of magnesia-carbon bricks. Utility Model Content
[0005] Based on the technical problems existing in the prior art, this utility model proposes a mud mixing device for the production of magnesia-carbon bricks.
[0006] This utility model discloses a mud mixing device for the production of magnesia-carbon bricks, comprising a mixing box. A motor is fixedly installed on the top of the mixing box, and the output shaft of the motor is connected to a main shaft extending into the mixing box. A mounting box is fixedly installed in the middle of the main shaft. Two guide rods that can slide up and down relative to each other are arranged parallel to each other in the vertical direction inside the mounting box. Multiple stirring rods are fixedly connected to the outer surfaces of the two guide rods. The top and bottom ends of the guide rods respectively protrude from corresponding guide openings on the mounting box. The two guide rods are connected by a transmission assembly so that their movement directions are opposite. A permanent magnet located inside the mounting box is fixedly installed on one of the guide rods, and an electromagnet is fixedly installed at the bottom of the mixing box.
[0007] Preferably, the transmission assembly includes two racks respectively fixed to the opposite inner sides of two guide rods, and a gear that meshes with both racks simultaneously; the gear is rotatably mounted on the inner wall of the mounting box via a rotating shaft.
[0008] Preferably, a pair of sealing side plates are fixedly installed on the inner walls of the left and right sides of the mounting box, and each pair of sealing side plates is installed close to the side of the corresponding guide rod.
[0009] Preferably, a fixing plate is fixedly connected to the inner side of each of the two guide rods; a guide post is vertically fixedly connected to the top of the fixing plate; a guide post sleeve is fixedly connected to the mounting box, and the top end of the guide post passes through the corresponding guide post sleeve; a spring is sleeved on the guide post, and the spring is located between the guide post sleeve and the fixing plate.
[0010] Preferably, a limiting block is also fixedly provided on the mounting box, and the limiting block is located below the fixing plate.
[0011] Preferably, the stirring rod is distributed in multiple layers on the guide rod.
[0012] Preferably, the electromagnet is electrically connected to an external control unit, which is used to periodically control the on and off states of the electromagnet.
[0013] Compared with the prior art, the present invention provides a mud mixing device for the production of magnesia-carbon bricks, which has the following beneficial effects:
[0014] 1. By using two independently sliding guide rods set inside the installation box, a gear and rack transmission assembly connecting the two, and a magnetic drive assembly composed of magnets and electromagnets, the automatic up-and-down reciprocating motion of the stirring rod is achieved by using magnetic force instead of complex mechanical transmission. When the electromagnet is energized to generate a magnetic field, it interacts with the magnet on the guide rod, directly or indirectly (through the transmission assembly) driving the two guide rods to move in opposite directions, thereby driving the stirring rod on them to move up and down in the mixing box. This design greatly expands the vertical range of the stirring action and effectively eliminates the mixing dead zone between the upper and lower layers. It is especially suitable for viscous magnesia-carbon brick mud that requires full up-and-down stirring.
[0015] 2. Due to the adoption of magnetic non-contact drive, the problems of easy wear, jamming, and frequent lubrication and maintenance caused by using precision mechanical transmission components such as lead screws and hydraulic cylinders in dusty and harsh environments are avoided. The structure is simpler, more reliable, and more durable, reducing equipment failure rate and maintenance costs.
[0016] 3. The sealed side plate effectively prevents mud from entering the installation box, protecting the internal transmission components (gears, racks) and permanent magnets, and ensuring the long-term reliability of the mechanism. At the same time, the auxiliary guiding and limiting mechanism composed of guide columns, springs and limit blocks makes the up-and-down sliding of the guide rod more stable and smooth. The springs also play a certain role in buffering and resetting, making the movement process more gentle and controllable. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a schematic diagram of the internal structure of the present invention;
[0019] Figure 3 This is a schematic diagram of the structure of the stirring component of this utility model;
[0020] Figure 4 This utility model Figure 3 A magnified structural diagram at point A.
[0021] In the diagram: 1. Mixing box; 101. Discharge port; 102. Box door; 2. Motor; 3. Main shaft; 301. Mounting box; 3011. Guide port; 4. Guide rod; 5. Stirring rod; 6. Rack; 7. Gear; 8. Permanent magnet; 9. Electromagnet; 10. Sealing side plate; 11. Fixing plate; 12. Guide post and guide sleeve; 13. Guide post; 14. Spring; 15. Limiting block. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0024] Please see Figures 1 to 4This embodiment provides a slurry mixing device for magnesia-carbon brick production. The main body of the device is a cylindrical or square mixing box 1 with an open top, welded from steel plates. A discharge port 101 is provided on the lower part of the outer wall of the mixing box 1 for discharging the slurry after mixing. A door 102 is hinged to the discharge port 101 and can be secured with a latch or pin to ensure good sealing during mixing. A motor 2 is fixedly mounted on the top of the mixing box 1 via a bracket or flange. This motor 2 is preferably a variable frequency speed control motor to adjust the rotation speed of the main shaft 3 according to process requirements. The output shaft of the motor 2 is vertically downward, passing through the center of the top plate of the mixing box 1, and connected to the upper end of a long shaft-shaped main shaft 3 via a coupling. The lower end of the main shaft 3 can be rotated and supported by a bearing seat installed at the center of the bottom of the mixing box 1 to improve rotational stability.
[0025] At the midpoint of the spindle 3, a rectangular mounting box 301 is fixedly installed. The mounting box 301 is made of steel plate and is hollow inside. The centers of its upper and lower plates are fixedly connected to the spindle 3 (such as by welding or keying), so that it rotates together with the spindle 3. Two guide openings 3011 are opened at the top and bottom of the mounting box 301.
[0026] Two long, rectangular or circular guide rods 4 are positioned inside the mounting box 301, on the left and right sides of the main shaft 3, respectively. The cross-sectional dimensions of the guide rods 4 are adapted to the width of the guide opening 3011, allowing the guide rods 4 to slide smoothly up and down along the guide opening 3011. Multiple layers of stirring rods 5 are welded or fixed to the outer side (i.e., the side facing away from the main shaft 3) of each guide rod 4. Scrapers can also be welded to the ends of the stirring rods 5, with the edge shape matching the curved surface of the inner wall of the mixing box 1, leaving a small gap.
[0027] The top and bottom ends of the two guide rods 4 protrude from the corresponding guide openings 3011 on the mounting box 301. On the opposing inner surfaces of the two guide rods 4 inside the mounting box 301, a rack 6 is fixedly mounted. The teeth of the two racks 6 face each other and are arranged parallel to each other. A gear 7 is rotatably mounted on the inner wall of the mounting box 301 (e.g., between the front and rear side plates) via a short shaft and bearings, and the gear 7 meshes with both racks 6 simultaneously, thus forming a transmission assembly. When one guide rod 4 moves up and down, it drives the gear 7 to rotate through the rack 6 fixed to it. The gear 7 then drives the other rack 6, thereby forcing the other guide rod 4 to move in the opposite direction, achieving mechanical linkage and reverse synchronization of the movements of the two guide rods 4.
[0028] A permanent magnet 8 (such as a neodymium iron boron magnet) is fixedly installed on the inner side of the guide rod 4 on one side (e.g., the right side). The permanent magnet 8 is located inside the mounting box 301. An electromagnet 9 is fixedly installed at the center of the bottom outer side of the mixing box 1, and is connected to an external power supply and control unit via wires. The control unit can be a simple timer switch or a programmable logic controller (PLC). When the electromagnet 9 is energized, it generates a magnetic field that interacts with the permanent magnet 8.
[0029] To prevent mud from entering the installation box 301 during the mixing process and contaminating the gears 7, racks 6, and permanent magnets 8, a pair of vertical sealing side plates 10 are fixedly installed on the inner walls of the left and right sides of the installation box 301. Each pair of sealing side plates 10 is tightly attached to the front and rear sides of the corresponding guide rod 4, thereby forming a dynamic seal on the sliding path of the guide rod 4 and effectively blocking the material from entering.
[0030] To ensure smoother up-and-down sliding of the guide rod 4 and to limit and buffer its travel, a horizontally mounted fixing plate 11 is fixedly connected to the guide rod 4 at the top of each of the two racks 6. Two guide posts 13 are vertically fixedly connected to the top of each fixing plate 11. Guide post sleeves 12 are fixedly mounted on the top plate of the mounting box 301 (or from the sealing side plate 10). The top of the guide post 13 passes upward through the corresponding guide post sleeve 12, forming a sliding fit. A spring 14 is fitted onto each guide post 13, compressed between the lower surface of the guide post sleeve 12 and the upper surface of the fixing plate 11. The preload of the spring 14 can be adjusted as needed. Its main function is to provide an upward supporting force and assist the guide rod 4 in returning to its original position after downward movement, making the movement smoother. In addition, a limit block 15 is fixedly installed on the inner wall of the mounting box 301 (or on the sealing side plate 10), directly below the fixing plate 11. The height of the limit block 15 determines the limit position of the guide rod 4 to move downward, preventing it from moving too far downward and colliding with the bottom of the mixing box 1 or other components.
[0031] The working principle is as follows:
[0032] In the initial state, motor 2 is not working, electromagnet 9 is de-energized, and the two sets of stirring rods 5 are stationary at a certain initial height (e.g., the middle position).
[0033] When mixing begins, the proportioned dry materials such as magnesia, graphite, and additives, as well as the binder, are first added from the top of the mixing tank 1. Then, the motor 2 is started. The motor 2 drives the entire stirring component (including the mounting box 301, guide rod 4, stirring rod 5, etc.) to rotate at a constant speed around the vertical axis through the main shaft 3. The rotating stirring rod 5 performs preliminary circumferential shearing and mixing of the materials in the tank.
[0034] Simultaneously, the control unit is activated, causing electromagnet 9 to be energized and de-energized according to a preset cycle (e.g., every 5-10 seconds). When electromagnet 9 is energized, it generates a magnetic field. Assuming that initially, the permanent magnet 8 on the right guide rod 4 is within the influence range of the magnetic field of electromagnet 9, and the polarities of the two are set to attract each other (or repel each other, achieved by adjusting the initial position), under the action of magnetic attraction, the right guide rod 4 will be subjected to a downward pulling force (or a pushing force if the polarities repel each other). This force overcomes the elasticity of spring 14, friction, etc., causing the right guide rod 4 to begin sliding downward. When the right guide rod 4 moves downward, the rack 6 on it drives the gear 7 to rotate clockwise. The rotation of gear 7 drives the rack 6 on the left to move upward, thereby forcing the left guide rod 4 to slide upward. Thus, during the time when electromagnet 9 is energized, the right stirring rod 5 moves downward, and the left stirring rod 5 moves upward.
[0035] When the electromagnet 9 is de-energized, the magnetic field disappears and the magnetic force disappears. At this time, under the restoring force of the spring 14, the two guide rods 4 tend to return to their original positions in the middle. However, due to the meshing relationship of the gear and rack, their movements are still linked.
[0036] The control unit controls the electromagnet 9 to periodically switch on and off, causing the left guide rod 4 and its stirring rod 5, as well as the right guide rod 4 and its stirring rod 5, to perform continuous, periodic, reciprocating up-and-down motions in the mixing chamber. This reciprocating motion is superimposed on the rotational motion driven by the main shaft 3, forming a complex three-dimensional composite motion trajectory. The stirring rod 5 not only moves in a circular motion in the horizontal plane to stir the material, but also moves up and down in the vertical direction, carrying the upper layer of material to the lower layer and turning the lower layer of material to the upper layer, and constantly changing the height of the stirring shear surface. This motion mode greatly enhances the convection diffusion and axial mixing of the material in the vertical direction, effectively breaking the stratification phenomenon and stirring dead zones that are easily caused by the high viscosity of the material.
[0037] The scraper located at the end of the stirring rod 5 rotates and moves up and down with the stirring rod 5, which can continuously scrape off the sticky material that may adhere to the inner wall of the mixing tank 1, so that it returns to the main fluid to continue to participate in the mixing. It also reduces scaling and makes the equipment easier to clean.
[0038] After the mixing reaches the predetermined time, the operation of electromagnet 9 is stopped first, then motor 2 is stopped, and finally the box door 102 at the discharge port 101 is opened. The uniformly mixed magnesia-carbon brick mud is discharged under gravity and enters the next process.
[0039] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.
Claims
1. A mud mixing device for producing magnesite carbon brick, comprising a mixing box (1), a motor (2) is fixedly installed on the top of the mixing box (1), a main shaft (3) extending into the interior of the mixing box (1) is connected to the output shaft of the motor (2), characterized in that: The middle part of the main shaft (3) is fixedly provided with a mounting box (301), two guide rods (4) are vertically and parallel arranged in the mounting box (301), a plurality of stirring rods (5) are fixedly connected to the outer sides of the two guide rods (4), the top end and the bottom end of the guide rod (4) respectively pass through the corresponding guide opening (3011) of the mounting box (301), the two guide rods (4) are connected through a transmission assembly, so that the movement directions of the two guide rods (4) are opposite, one of the guide rods (4) is fixedly installed with a permanent magnet (8) inside the mounting box (301), and the bottom of the mixing box (1) is fixedly installed with an electromagnet (9).
2. The clay mixing device for producing magnesia carbon brick according to claim 1, characterized in that: The transmission assembly comprises two racks (6) fixed to the opposite inner sides of the two guide rods (4) and a gear (7) engaged with the two racks (6); the gear (7) is rotatably installed on the inner wall of the mounting box (301) through a rotating shaft.
3. The clay mixing device for producing magnesia carbon brick according to claim 1, characterized in that: A pair of sealing side plates (10) are fixedly arranged on the inner walls of the left and right sides of the mounting box (301), and each pair of sealing side plates (10) is arranged close to the side of the corresponding guide rod (4).
4. The clay mixing device for producing magnesia carbon brick according to claim 1, characterized in that: The inner sides of the two guide rods (4) are respectively fixedly connected with a fixed plate (11); the top of the fixed plate (11) is vertically fixedly connected with a guide column (13); the mounting box (301) is fixedly connected with a guide column guide sleeve (12), and the top end of the guide column (13) passes through the corresponding guide column guide sleeve (12); a spring (14) is sleeved on the guide column (13), and the spring (14) is located between the guide column guide sleeve (12) and the fixed plate (11).
5. The clay mixing device for producing magnesia carbon brick according to claim 4, characterized in that: The mounting box (301) is also fixedly provided with a limiting block (15), and the limiting block (15) is located below the fixed plate (11).
6. The clay mixing device for producing magnesia carbon brick according to claim 1, characterized in that: The stirring rods (5) are distributed in multiple layers on the guide rods (4).
7. The mixture device for the raw material of magnesia carbon brick according to any one of claims 1 to 6, characterized in that: The electromagnet (9) is electrically connected with an external control unit, and the control unit is used for periodically controlling the on-off of the electromagnet (9).