Hard alloy slurry anti-settling slurry barrel

Abstract

The utility model relates to hard alloy powder metallurgy production equipment technical field, concretely relates to hard alloy slurry prevents deposition with slurry barrel. A kind of hard alloy slurry prevents deposition with slurry barrel, including barrel, stirring mechanism is fixed on barrel, the stirring mechanism has the stirring paddle of inlaying into barrel, the barrel rotatable support setting is in rack, rotating mechanism for driving barrel autorotation is equipped on the rack, the rotating direction of the barrel under the action of rotating mechanism is opposite with the rotating direction of the stirring paddle under the action of stirring mechanism;The stirring paddle is located in the middle part of the barrel, and the circumference diameter formed when the paddle blade of the stirring paddle rotates is 20-30% of the diameter of the barrel.The utility model has the advantages that the rapid settlement of hard alloy slurry and barrel wall deposition can be avoided, the high uniformity of slurry concentration can be realized, and the subsequent process effect can be improved.

Description

Technical Field

[0001] This utility model relates to the technical field of cemented carbide powder metallurgy production equipment, specifically to a slurry tank for preventing sedimentation of cemented carbide slurry. Background Technology

[0002] Hard alloys are typically produced using powder metallurgy, which involves grinding and mixing metal powders of different compositions, forming agents, and anhydrous ethanol in a ball mill. After grinding, the slurry is transferred to a stainless steel slurry tank after a screening process, and then moved to the next process. The next process after ball milling is usually spray drying. Spray drying is suitable for continuous high-volume processing, but it yields the best granulation results when the slurry concentration is uniform.

[0003] Because the cemented carbide slurry contains a large amount of metal powder, even after ball milling to achieve finer particles, significant sedimentation still occurs, and powder deposits are observed on the walls of the slurry tank during actual operation. Although motor stirring is used before the spray tower during the spray drying process, the effect is far less than that of the slurry freshly ball-milled; furthermore, the settled metal particles are not easily drawn into the spray tower through the pipes, and the metal sludge adhering to the tank walls leads to raw material loss. Utility Model Content

[0004] The purpose of this invention is to provide a cemented carbide slurry anti-deposition slurry tank that can prevent slurry deposition and improve the production efficiency of subsequent processes.

[0005] To achieve the above objectives, this utility model employs a cemented carbide slurry anti-deposition slurry tank, comprising a tank body, a stirring mechanism fixed on the tank body, the stirring mechanism having a stirring paddle extending into the tank body, the tank body being rotatably supported on a frame, the frame being provided with a rotating mechanism for driving the tank body to rotate, the rotation direction of the tank body under the action of the rotating mechanism being opposite to the rotation direction of the stirring paddle under the action of the stirring mechanism; the stirring paddle is located in the middle of the tank body, and the circumference diameter formed by the rotating blades of the stirring paddle is 20-30% of the diameter of the tank body.

[0006] This invention uses a rotating mechanism to drive the barrel to rotate, while a stirring mechanism drives the stirring paddle to rotate in the opposite direction, forming a reverse shear flow field. The centrifugal forces generated by the barrel and the paddle cancel each other out, reducing the throwing force of the slurry against the barrel wall and inhibiting wall deposition from the source. The reverse rotation generates a complex flow pattern of stretching, folding, and bending, which enhances the turbulence intensity, continuously destroys the powder agglomeration structure, and effectively prevents gravity settling. The bidirectional shear force continuously scours the barrel wall, causing the attached powder to peel off and remix, thus minimizing the deposition of metal powder on the barrel wall.

[0007] The impellers act only on the core area of ​​the barrel (20-30% of the diameter), forming a central forced mixing zone. The small impeller diameter and moderate edge linear velocity prevent high-speed impact from accelerating sedimentation on the barrel wall (if the diameter is >30%, excessive centrifugal force will cause the slurry to be thrown onto the wall). The impellers drive the central slurry to rotate, and with the help of the barrel's counter-rotation, the kinetic energy is transferred to the outer area, achieving gentle mixing throughout the entire process, with concentration uniformity approaching that of a ball mill.

[0008] This invention significantly slows down the sedimentation rate through the above-mentioned settings, thereby reducing the sedimentation rate on the barrel wall and greatly reducing the raw material waste rate. It also enables the slurry concentration to be as uniform as that of fresh ball mill slurry, resulting in better processing effects in subsequent processes.

[0009] Preferably, a linear pushing device is fixed on the frame, the output end of the linear pushing device is fixed to the connecting frame, the connecting frame is located inside the barrel, and a material taking pipe is fixed on the connecting frame. The material taking pipe includes a material taking section that extends laterally toward the inside of the barrel and an extension section that extends to the outside of the barrel and is connected to the sampling pump.

[0010] The sampling tube's inlet is positioned directly over the core flow area of ​​the slurry (not the peripheral stagnant area), enabling the extraction of a representative sample after thorough mixing. This avoids obtaining only the slurry from the sediment layer on the tank wall or the dead zone of the mixing process, ensuring that the test data accurately reflects the overall uniformity. Furthermore, the sampling tube's inlet can be adjusted in position using a linear pushing device, allowing sampling from different locations within the tank. A conventional pump is used for slurry sampling, and existing testing equipment is used to determine the slurry concentration. Once the detected slurry concentration meets the usage requirements, the slurry in the tank is poured into the feed inlet of the next process step.

[0011] Preferably, a support frame is fixed on the frame, a rotary drive device is provided at the lower part of the support frame, a linear push device is provided at the upper part of the support frame, a linkage wheel is fixed on the lower side of the barrel, and a drive wheel is provided at the output end of the rotary drive device. The drive wheel is linked to the linkage wheel through a belt or chain.

[0012] Both the rotary drive and linear push devices are located on the support frame, resulting in a more centralized configuration and facilitating the transport of the barrel. Placing the heavier rotary drive device at the bottom of the support frame significantly lowers the overall center of gravity of the barrel, resulting in stronger anti-tipping moment and less vibration amplitude when the barrel rotates. The linear push device can be an electric push rod, an electric cylinder, or a handwheel-type linear reciprocating push device.

[0013] Preferably, the connecting frame is L-shaped, including a vertical part close to the side wall of the barrel and a horizontal part connected to the lower end of the vertical part, and the material picking section is located at the horizontal part.

[0014] The connecting frame is arranged along the inner wall of the barrel, completely avoiding the 20-30% diameter working area of ​​the central agitator, thus preventing any cutting or obstruction of the core mixing flow field and ensuring the integrity of the bidirectional counter-rotating shear flow field. The sampling section is located at the bottom horizontal section, in the annular mixing zone between the agitator edge and the barrel wall. This area has moderate flow velocity and sufficient turbulence, which can represent the overall mixing uniformity while avoiding local concentration deviations that may be caused by the high-speed vortex in the center.

[0015] Preferably, a lifting drive device is fixed on the support frame, and the linear pushing device is fixed to the output end of the lifting drive device. The lifting drive device drives the material collection pipe to be continuously adjustable in the height direction of the barrel, allowing for the collection of upper, middle, and lower layer slurry samples at fixed points.

[0016] Preferably, an annular shell is fixed on the frame, and the barrel is rotatably disposed within the shell. A cover plate is provided on the top of the shell, and the cover plate includes a fixed cover plate and a movable cover plate. The stirring mechanism is fixed to the fixed cover plate. The stirring mechanism and other components are disposed on the fixed cover plate or the frame, physically isolated from the rotating barrel, thus achieving an intrinsically safe design.

[0017] This invention has the advantages of avoiding rapid settling and sedimentation of hard alloy slurry on the barrel wall, achieving high uniformity of slurry concentration, and facilitating the improvement of subsequent processes. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a cross-sectional view of the present invention. Detailed Implementation

[0020] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0021] Depend on Figure 1 and Figure 2 As shown, this embodiment provides a slurry tank for preventing sedimentation of hard alloy slurry, including a frame 1, a tank body 2, a rotating mechanism, and a stirring mechanism 4. The frame 1 is welded from structural steel, and the bottom is provided with a mating groove and other structures that cooperate with the front fork of a forklift 10, facilitating transportation within the workshop.

[0022] A ring-shaped shell 6 is welded onto the frame 1. The barrel 2 is rotatably disposed inside the shell 6. A cover plate is provided on the top of the shell 6. The cover plate includes a fixed cover plate 62 and a movable cover plate 61. The stirring mechanism 4 is fixed on the stirring mechanism 6. A support frame is fixed to the front side of the frame 1. The support frame is covered by a cover 13. A rotary drive device 31 is installed at the lower part of the support frame, and a lifting drive device 52 is installed at the upper part. The cover 13 covers the rotary drive device 31. The upper end of the lifting drive device 52 extends outside the cover 13, and a linear push device 51 is fixed to the output end of the upper end of the lifting drive device 52. In this embodiment, the linear push device 51 and the lifting drive device 52 can be a handwheel screw drive device.

[0023] A rotating shaft 21 is welded to the center of the bottom of the barrel 2, and is rotatably supported on the frame 1 via a bearing seat 22. A linkage wheel 23 is fixed to the lower end of the rotating shaft 21. The rotary drive device 31 includes a servo motor and a drive wheel 32 fixed to the output end of the servo motor. The drive wheel 32 is linked to the linkage wheel 23 via a belt.

[0024] The stirring mechanism 4 includes a stirring motor 41 and a stirring paddle 42. The stirring motor 41 is fixedly mounted on the fixed cover plate 62, and the paddle shaft of the stirring paddle 42 extends into the interior of the barrel 2. The circumference diameter formed by the rotating blades 43 of the stirring paddle 42 is 20%-30% of the inner diameter of the barrel 2, preferably 25%. The rotation direction of the barrel 2 under the action of the rotating mechanism is opposite to the rotation direction of the stirring paddle 42 under the action of the stirring mechanism 4. In this embodiment, if the barrel 2 rotates clockwise, the stirring paddle 42 rotates counterclockwise, forming a reverse shear flow field.

[0025] The connecting frame 53 is L-shaped, including a vertical section close to the side wall of the tank 2 and a horizontal section connected to the lower end of the vertical section. The material taking pipe extends along the extending direction of the connecting frame 53 and is fixed to the connecting frame 53. The material taking pipe includes a material taking section 541 extending laterally towards the inside of the tank 2 and an extension section 542 extending outside the tank 2. The material taking section 541 is fixed to the horizontal section of the connecting frame 53, with its opening facing the core area of ​​the slurry flow. The extension section 542 is connected to a sampling pump via a flexible hose of a certain length. The sampling pump can be a peristaltic pump or a diaphragm pump. The extension section 542 is fixed to the movable part of the linear pushing device 5.

[0026] This embodiment can avoid rapid settling and sedimentation of hard alloy slurry on the barrel wall, and has the advantages of achieving high uniformity of slurry concentration and facilitating the improvement of subsequent processes.

Claims

1. A slurry tank for preventing sedimentation of hard alloy slurry, comprising a tank body, a stirring mechanism fixed on the tank body, the stirring mechanism having a stirring paddle extending into the tank body, characterized in that: The barrel is rotatably supported on the frame, and the frame is provided with a rotating mechanism for driving the barrel to rotate. The direction of rotation of the barrel under the action of the rotating mechanism is opposite to the direction of rotation of the stirring paddle under the action of the stirring mechanism. The stirring paddle is located in the middle of the barrel, and the circumference formed by the rotating blades of the stirring paddle is 20-30% of the diameter of the barrel.

2. The cemented carbide slurry anti-deposition tank according to claim 1, characterized in that: A linear pushing device is fixed on the frame. The output end of the linear pushing device is fixed to the connecting frame. The connecting frame is located inside the barrel, and a material taking pipe is fixed on the connecting frame. The material taking pipe includes a material taking section that extends laterally toward the inside of the barrel and an extension section that extends to the outside of the barrel and is connected to the sampling pump.

3. The cemented carbide slurry anti-deposition tank according to claim 2, characterized in that: A support frame is fixed on the frame, a rotary drive device is provided at the lower part of the support frame, and a linear push device is provided at the upper part of the support frame. A linkage wheel is fixed on the lower side of the barrel, and a drive wheel is provided at the output end of the rotary drive device. The drive wheel is linked to the linkage wheel through a belt or chain.

4. The cemented carbide slurry anti-deposition tank according to claim 2 or 3, characterized in that: The connecting frame is L-shaped and includes a vertical part close to the side wall of the barrel and a horizontal part connected to the lower end of the vertical part. The material picking section is located at the horizontal part.

5. The cemented carbide slurry anti-deposition tank according to claim 3, characterized in that: A lifting drive device is fixed on the support frame, and the linear pushing device is fixed to the output end of the lifting drive device.

6. The cemented carbide slurry anti-deposition tank according to claim 1, characterized in that: An annular shell is fixed on the frame, and the barrel is rotatably disposed inside the shell. A cover plate is provided on the top of the shell, and the cover plate includes a fixed cover plate and a movable cover plate. The stirring mechanism is fixed on the fixed cover plate.

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