Powder homogenizer with high mixing efficiency

Abstract

The powder homogenizer with the high mixing efficiency comprises a vertical mixing bin with a tank body being a square body, a left transmission conveying mechanism and a right transmission conveying mechanism which are arranged in a staggered mode with the left lower than the right are arranged on the bottom face of the mixing bin, and the bottom face portion between the left transmission conveying mechanism and the right transmission conveying mechanism is of a middle inclined face structure. A feeding mechanism for returning materials to the top of the mixing bin is arranged at an output port of the left transmission conveying mechanism, and a communicating inclined groove communicating with the output port of the left transmission conveying mechanism is formed in an output port of the right transmission conveying mechanism. The efficient homogenizing device can achieve the efficient homogenizing effect, and is simple in structure, small in occupied area, high in utilization efficiency of the mixing bin, power-saving, time-saving and labor-saving.

Description

Technical Field

[0001] This utility model relates to the field of homogenizers, and in particular to a powder homogenizer with high mixing efficiency. Background Technology

[0002] Existing powder mixtures, such as those used in mosquito coils, are generally made from various powders (such as wood powder, charcoal powder, wood starch, bamboo powder, red sandalwood powder, elm bark powder, etc.). First, the powders are thoroughly mixed, then the mixture is shaped into mosquito coils using a mosquito coil forming machine, followed by drying to complete the production. In the mosquito coil production process, the powders are mostly mixed in a large vertical cylindrical container with a mixer. During mixing, because the raw materials are all in powder form with significant differences in specific gravity and have a certain stickiness, they are prone to clumping. This traditional mixing method makes it difficult to achieve uniform mixing, thus affecting the quality of the produced product. Chinese patent CN201720168834.2 discloses a powder homogenizer. Its horizontal inner drum rotation design avoids the problem of uneven mixing caused by gravity, and the mixing device with stirring nozzles continuously stirs the bottom layer of powder, achieving efficient mixing and improving production efficiency. However, its overall structure is complex, and its production cost is high. Furthermore, the more times and for longer the powder is subjected to rotational friction, the more its physical and chemical properties deteriorate, and the more it loses viscosity. This makes the mosquito coil powder produced later less sticky, prone to scattering and falling off, affecting product quality. Moreover, this horizontal design requires a large area and a large production space, which is a significant cost for companies in the current period of high land costs. Therefore, it is difficult for most manufacturers to accept. Summary of the Invention

[0003] The purpose of this utility model is to address the aforementioned problems and deficiencies by providing a powder homogenizer that achieves efficient mixing, reduces raw material homogenization time, and improves production efficiency, while also being simple in structure, small in footprint, highly efficient in mixing chamber utilization, and saving electricity, time, and labor.

[0004] The technical solution of this utility model is implemented as follows:

[0005] The high-efficiency powder homogenizer of this utility model includes a vertical mixing chamber with a square body and a support frame located below the mixing chamber. The bottom surface of the mixing chamber is provided with a left transmission conveying mechanism and a right transmission conveying mechanism that are staggered on the left and right sides, and the bottom part between the left and right transmission conveying mechanisms is divided into a middle inclined structure. The left and right transmission conveying mechanisms are connected to the inner cavity of the mixing chamber. The output port of the left transmission conveying mechanism is provided with a feeding mechanism that returns material to the top of the mixing chamber to achieve cyclic mixing. The output port of the right transmission conveying mechanism sends powder to the output port of the left transmission conveying mechanism through an external connecting inclined pipe or connecting inclined chute.

[0006] Preferably, the slope of the inclined structure is designed to be 40-60 degrees. Most preferably, it is 45-50 degrees.

[0007] Furthermore, the feeding mechanism is a spiral hose feeder, which includes a hose containing a manganese steel spiral and a feeding motor that drives the manganese steel spiral inside the hose to move and achieve feeding.

[0008] Furthermore, both the left and right transmission conveying mechanisms primarily consist of a horizontally oriented screw groove with an open top, a screw located within the screw groove, and a drive motor that rotates the screw. The output ports of the left and right transmission conveying mechanisms are respectively located at the bottom of the outer end of the corresponding screw groove. Even further, the left transmission conveying mechanism has a left inclined surface structure connecting the left side wall of the mixing chamber and extending inclined towards the left transmission conveying mechanism. Similarly, the right transmission conveying mechanism has a right inclined surface structure connecting the right side wall of the mixing chamber and extending inclined towards the right transmission conveying mechanism.

[0009] Furthermore, the mixing chamber has a spreading frame at the top of its inner cavity, and the discharge port of the feeding mechanism is located above the spreading frame. The feeding mechanism delivers the powder to the spreading frame and then spreads it into the mixing chamber from around the spreading frame.

[0010] Furthermore, the screw grooves of the left and right transmission conveying mechanisms are respectively located at the lower end of the tank body near the left and right sides, and multiple tie rods are provided inside the mixing chamber.

[0011] To further improve homogenization efficiency and prevent powder clumping and retention, a vibrator is installed on the spreading frame.

[0012] Furthermore, the drive motors in the left and right transmission conveying mechanisms are variable-speed motors, and the variable-speed motors in the left and right transmission conveying mechanisms have a speed difference. The left and right transmission conveying mechanisms achieve different mixing speeds and create a speed difference between the left and right powder particles as they descend, thereby further increasing the number of homogenization cycles and improving homogenization efficiency by adjusting the screw speeds in their respective screw channels. Preferably, the motor speed of the right transmission conveying mechanism is lower than that of the left transmission conveying mechanism. In addition to the different mixing speeds in the screw channels creating a speed difference between the left and right powder particles for a second mixing, some powder that falls and accumulates above the right transmission conveying mechanism will be sent to the left transmission conveying mechanism for a second mixing as it descends along the central inclined structure. Moreover, this powder will also mix again with the powder sprinkled from the spreading frame as it descends along the central inclined structure. Another advantage of this left and right drive conveyor mechanism, which has a speed difference, is that it can clean the powder according to the different conditions of the powder on the left and right sides of the mixing chamber. For example, if there is a lot of powder accumulated at the left drive conveyor, the speed of the screw on the left can be increased to clean the accumulated powder on the left side as quickly as possible. After cleaning, the speeds of both sides can be adjusted as needed.

[0013] The mixing chamber has a weighing chamber and a weighing sensor connected to the weighing chamber to measure the powder output each time. The spreading frame has a material frame with an open top and a conveying pipe connecting the material frame and the weighing chamber. The discharge port of the feeding mechanism is located above the material frame, and the side of the material frame has a corresponding slot that communicates with the upper end of the conveying pipe.

[0014] The advantages of this utility model compared with the prior art are:

[0015] (1) Due to the adoption of a three-dimensional square mixing chamber structure, this utility model greatly reduces the floor space occupied by the equipment compared with the existing horizontal mixing chamber, thus reducing the investment cost of the factory. Compared with the existing vertical circular mixing chamber, the square chamber has a larger usable cavity volume and higher utilization rate under the same floor space conditions.

[0016] (2) This utility model employs a left-hand drive conveyor mechanism and a right-hand drive conveyor mechanism, staggered and positioned with the left side lower than the right side, installed on the bottom surface of the mixing chamber. The bottom surface between the left and right drive conveyors is designed with a central sloping structure. This design allows for full utilization of the sloping bottom surface during the homogenization of mosquito coil powder, enabling the powder to fall from the top of the mixing chamber at different landing times and heights. This effectively avoids problems such as powder accumulation and clumping at the bottom, low mixing efficiency, and long mixing time caused by powder falling at the same height. Furthermore, the central sloping structure of the mixing chamber bottom allows the powder falling onto it to be continuously fed to the left drive conveyor mechanism for a second mixing under gravity, further improving mixing efficiency. This natural homogenization method, utilizing different drop heights and the sloping surface, has minimal impact on the physical and chemical properties of the powder, with no degradation of physical properties. The resulting mosquito coil powder is firmly bonded, does not easily shed, and has high product quality.

[0017] (3) This utility model also adopts a structure in which the output port of the right transmission conveying mechanism sends the powder to the output port of the left transmission conveying mechanism through a connecting inclined pipe or connecting inclined chute. When the powder that has been first stirred and homogenized by the right transmission conveying mechanism is tilted and descending on the connecting inclined pipe or connecting inclined chute, it will be homogenized a second time due to the different gravity of different powders. Then it will be mixed with the powder output by the left transmission conveying mechanism to achieve a third homogenization. After that, it will be sent to the top of the mixing bin for return and cyclic mixing through the feeding mechanism. This homogenization method of multiple homogenization and cyclic mixing of powder greatly improves the homogenization efficiency of powder, saves homogenization time, and truly achieves the purpose of saving electricity, time and manpower. Moreover, this homogenization method, which uses left and right transmission output mechanisms and external connecting inclined pipes or chutes below the mixing chamber to deliver powder to the output port of the left transmission conveyor for mixing and then returning for recycling, effectively reduces the discharge pressure of the powder and increases the discharge speed. It solves the problems of existing mixing chambers with only one discharge port, such as high powder pressure at the bottom of the mixing chamber, slow discharge, and easy blockage of the discharge port. Furthermore, the screws in the left and right transmission conveyors of this invention, when rotating, not only stir and homogenize the powder but also accelerate its flow along the screw channels, thereby improving the material transport rate of the device.

[0018] (4) Because the variable speed motors in the left transmission conveying mechanism and the right transmission conveying mechanism have a speed difference, the powder on the left and right sides of the mixing chamber forms a downward speed difference (one side is fast and the other side is slow) under the action of the screws in the two horizontal grooves. However, they are mixed again at the output port of the left transmission conveying mechanism, which further improves the homogenization efficiency.

[0019] (5) Since this utility model also uses a weighing bin and a weighing sensor on the outside of the mixing bin, the homogenized powder can be directly sent into the weighing bin through the conveying pipe connected to the material frame after being sent to the material frame, so it is more convenient to use.

[0020] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 for Figure 1 A rear-view three-dimensional structural diagram after removing the feeding mechanism;

[0023] Figures 3-4 This is a cross-sectional view of the present invention after the feeding mechanism has been removed. Detailed Implementation

[0024] like Figures 1-4 As shown, the high-efficiency powder homogenizer of this utility model includes a vertical mixing chamber 1 with a square body. A support frame is located below the mixing chamber. A feed pipe or hopper discharges material from the top of the mixing chamber 1 (initial discharge can also be manual). The bottom surface of the mixing chamber 1 is equipped with a left-hand conveying mechanism 2 and a right-hand conveying mechanism 3, which are staggered (left-hand high, right-hand low, are equivalent). The bottom surface between the left-hand conveying mechanism 2 and the right-hand conveying mechanism 3 is divided into a central inclined structure 43. The left-hand conveying mechanism 2 and the right-hand conveying mechanism 3 communicate with the inner cavity of the mixing chamber 1. The output port of the left-hand conveying mechanism 2 is equipped with a feeding mechanism that returns material to the top of the mixing chamber 1 for cyclic mixing. The output port of the right-hand conveying mechanism 3 delivers powder to the output port of the left-hand conveying mechanism 2 through an externally connected inclined pipe or connected inclined chute 5 (preferably a connected inclined chute). The slope of the central inclined structure 43 is preferably 45-50 degrees. If the slope is too shallow, the powder will not fall easily; if the slope is too steep, the falling speed will be too fast, affecting the homogenization efficiency. The feeding mechanism is a spiral hose feeder, which includes a hose 6 containing a manganese steel spiral and a feeding motor that drives the manganese steel spiral in the hose 6 to achieve feeding.

[0025] Both the left and right transmission conveying mechanisms 2 and 3 are mainly composed of horizontal screw channels with open tops, screws located within the screw channels, and drive motors that drive the screws to rotate. The output ports of the left and right transmission conveying mechanisms 2 and 3 are respectively located at the bottom of the outer ends of the corresponding screw channels. The outer ends of the screw channels extend outward from the bottom surface. When the screws rotate, they not only stir and homogenize the powder, but also accelerate the flow of the powder along the screw channels, thereby improving the material transport rate of the device. Furthermore, the drive motors in the left and right transmission conveying mechanisms 2 and 3 are variable speed motors, and the speed of the variable speed motor in the left transmission conveying mechanism 2 is greater than that in the right transmission conveying mechanism 3. To reduce the force of the powder falling onto the screw from above, an inverted V-shaped guide plate 7 is also provided above the horizontal screw channel. The gap between the two sides of the guide plate 7 and the two sides of the horizontal screw channel forms a feed inlet. Furthermore, a left inclined structure 41 is provided between the screw groove of the left drive conveyor and the left side wall of the mixing chamber, connecting the left side wall of the mixing chamber and extending inclined towards the left drive conveyor. A right inclined structure 42 is provided between the screw groove of the right drive conveyor and the right side wall of the mixing chamber, connecting the right side wall of the mixing chamber and extending inclined towards the right drive conveyor. Because the left and right sides and the middle of the bottom surface of the mixing chamber are all inclined structures, in addition to enabling multiple homogenizations, the problem of powder stagnation dead corners is effectively avoided.

[0026] The mixing chamber 1 has a spreading frame 8 at the top of its inner cavity. The discharge port of the feeding mechanism is located above the spreading frame 8. The feeding mechanism delivers powder to the spreading frame 8, and then the powder is spread into the mixing chamber 1 from all sides of the spreading frame 8. The screw grooves of the left transmission conveying mechanism 2 and the right transmission conveying mechanism 3 are respectively located at the lower end of the tank body near the left and right sides. Multiple separately arranged tie rods 11 are provided inside the mixing chamber 1. The purpose of the tie rods is to prevent the mixing chamber from expanding and deforming when there is a large amount of powder during mixing. Furthermore, a vibrator is installed on the spreading frame 8 to prevent the powder on the spreading frame from clumping and stagnating.

[0027] To enable direct metering and output of the homogenized powder, a weighing chamber 9 and a weighing sensor connected to the weighing chamber 9 are provided on the outside of the mixing chamber 1. The spreading frame 8 is equipped with a material frame 81 with an open top and a conveying pipe 91 connecting the material frame 81 and the weighing chamber 9. The discharge port of the feeding mechanism is located above the material frame, and the side of the material frame has a corresponding slot communicating with the upper end of the conveying pipe. In this way, after the homogenized powder is delivered to the material frame on the spreading frame, it can be directly fed into the weighing chamber through the conveying pipe connected to the material frame for metering of each output of powder, making it more convenient to use. The conveying pipe can be connected to an air pump, or it can be a pipe with a built-in manganese steel spiral feeder and a motor connected to it.

[0028] To prevent dust spontaneous combustion and explosion during use, the mixing chamber 1 is equipped with a safety device that periodically injects CO2 gas into its interior. This device includes a CO2 gas generator and a gas delivery pipe for injecting CO2 gas into the mixing chamber. A connector 10 for connecting the gas delivery pipe is located at the bottom of the mixing chamber 1.

[0029] In the description of this patent, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "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 patent 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 patent.

[0030] Although this invention has been described with reference to specific embodiments, such description is not intended to limit the invention. Other variations of the disclosed embodiments, based on the description of this invention, will be foreseeable to those skilled in the art, and such variations should fall within the scope defined by the appended claims.

Claims

1. A powder homogenizer with high mixing efficiency, characterized in that: The mixture includes a vertical mixing chamber (1) with a square body and a support frame located below the mixing chamber (1). The bottom surface of the mixing chamber (1) is provided with a left transmission conveying mechanism (2) and a right transmission conveying mechanism (3) that are staggered on the left and right sides. The bottom part between the left transmission conveying mechanism (2) and the right transmission conveying mechanism (3) is provided with a central inclined structure (43). The left transmission conveying mechanism (2) and the right transmission conveying mechanism (3) are respectively connected to the inner cavity of the mixing chamber (1). The output port of the left transmission conveying mechanism (2) is provided with a feeding mechanism that returns material to the top of the mixing chamber (1) to achieve cyclic mixing. The output port of the right transmission conveying mechanism (3) sends the powder to the output port of the left transmission conveying mechanism (2) through an external connecting inclined pipe or connecting inclined groove (5).

2. The powder homogenizer according to claim 1, characterized in that: The feeding mechanism is a spiral hose feeder, which includes a hose (6) containing a manganese steel spiral and a feeding motor that drives the manganese steel spiral in the hose (6) to move and feed the material.

3. The powder homogenizer according to claim 1, characterized in that: The left transmission conveying mechanism (2) and the right transmission conveying mechanism (3) are mainly composed of a horizontal screw groove with an open top, a screw located in the screw groove, and a drive motor that drives the screw to rotate. The output ports of the left transmission conveying mechanism (2) and the right transmission conveying mechanism (3) are respectively set at the bottom of the outer end of the corresponding screw groove.

4. The powder homogenizer according to claim 3, characterized in that: The screw grooves of the left transmission conveying mechanism (2) and the right transmission conveying mechanism (3) are respectively located at the lower end of the tank body near the left and right sides, and the mixing chamber (1) is provided with multiple tie rods (11) arranged separately.

5. The powder homogenizer according to claim 1, characterized in that: The mixing chamber (1) has a spreading rack (8) at the top of its inner cavity. The outlet of the feeding mechanism is located above the spreading rack (8). The feeding mechanism sends the powder to the spreading rack (8) and then spreads it into the mixing chamber (1) from the surrounding area of ​​the spreading rack (8).

6. The powder homogenizer according to claim 5, characterized in that: The mixing chamber (1) has a weighing chamber (9) and a weighing sensor connected to the weighing chamber (9) to measure the output powder each time. The spreading frame (8) has a material frame (81) with an open top and a conveying pipe (91) connecting the material frame (81) and the weighing chamber (9). The discharge port of the feeding mechanism is located above the material frame, and the side of the material frame has a corresponding slot that communicates with the upper end of the conveying pipe.

7. The powder homogenizer according to claim 1, characterized in that: The drive motors in the left transmission conveying mechanism (2) and the right transmission conveying mechanism (3) are variable speed motors, and the variable speed motors in the left transmission conveying mechanism (2) and the right transmission conveying mechanism (3) have a speed difference.

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