A high-performance spherical graphite material mixing and stirring assembly

Abstract

The utility model provides a kind of high-performance spherical graphite material's mixing stirring subassembly, belong to graphite processing technical field, this high-performance spherical graphite material's mixing stirring subassembly, comprising: stirring barrel, rotary stirring shaft, spherical stirring blade subassembly, support base and transmission connecting component;Support base is triangular frame, apex is equipped with support column, and upper end is formed triangular support frame through connecting crossbeam;Stirring barrel is cylindrical stainless steel, and bottom flange plate is connected with base center;Rotary stirring shaft passes through barrel center, and upper end is connected with transmission connecting component key groove;Spherical stirring blade subassembly contains center connecting sleeve and radial arc blade, and is installed in the middle lower part of shaft;Transmission component is located above base, and is driven shaft rotation through gear reduction mechanism;The utility model can solve the technical problems of uneven mixing, serious particle agglomeration and low stirring efficiency in the mixing and stirring process of spherical graphite material in the prior art.

Description

Technical Field

[0001] This utility model belongs to the field of graphite processing technology, and specifically relates to a mixing and stirring component for high-performance spherical graphite materials. Background Technology

[0002] Spherical graphite materials, as a crucial component of lithium-ion battery anode materials, are experiencing continuously growing demand in the fields of new energy vehicles and energy storage. In the production process of spherical graphite materials, the mixing and stirring process is one of the key steps, directly affecting the performance and quality of the final product. Currently, commonly used mixing and stirring equipment in industrial production mainly includes ribbon mixers, paddle mixers, and planetary mixers. While ribbon mixers have the advantages of simple structure and low manufacturing cost, the large gap between the stirring blades and the cylinder wall makes it difficult to form effective shearing action, resulting in insufficient dispersion of graphite particle agglomerates and unsatisfactory mixing effects. Although paddle mixers have high stirring intensity, their flat blade structure easily leads to material accumulation and stirring dead zones when handling spherical graphite materials, affecting mixing uniformity. While planetary mixers offer good mixing effects, they are complex, difficult to maintain, and have high energy consumption, making them unsuitable for large-scale industrial production. Common problems with existing mixing equipment include: the geometry of the mixing blades is not compatible with the properties of spherical graphite materials, making it difficult to achieve effective shear dispersion; the internal flow field design of the mixing cylinder is unreasonable, resulting in dead zones and material retention; the equipment structure is not stable enough, and vibration and wear problems are prone to occur under high speed and high torque conditions; and the transmission system is not properly matched, affecting mixing efficiency and equipment life. Utility Model Content

[0003] In view of this, the present invention provides a high-performance mixing and stirring component for spherical graphite materials, which can solve the technical problems of uneven mixing, severe particle agglomeration, and low stirring efficiency in the mixing and stirring process of spherical graphite materials in the prior art.

[0004] This utility model is implemented as follows:

[0005] This invention provides a high-performance mixing and stirring assembly for spherical graphite materials, comprising: a stirring cylinder, a rotating stirring shaft, a spherical stirring blade assembly, a support base, and a transmission connection assembly; the support base has a triangular frame structure, with support columns at its three vertices, and the upper ends of the three support columns are fixedly connected by a connecting beam to form a stable triangular support frame; the stirring cylinder is a cylindrical stainless steel structure, and the bottom of the stirring cylinder is fixedly connected to the center of the support base via a flange; the rotating stirring shaft passes vertically through the geometric center of the stirring cylinder, and the upper end of the rotating stirring shaft extends out of the top of the stirring cylinder and is connected to the input end of the transmission connection assembly via a keyway; the spherical stirring blade assembly is fixedly installed in the lower middle part of the rotating stirring shaft, and includes a central connecting sleeve and multiple arc-shaped stirring blades, the central connecting sleeve being fitted onto the rotating stirring shaft and locked by fastening bolts, and the multiple arc-shaped stirring blades being radially distributed on the outer circumferential surface of the central connecting sleeve; the transmission connection assembly is installed above the support base, and the transmission connection assembly drives the rotating stirring shaft to rotate via a gear reduction mechanism.

[0006] The technical advantages of the high-performance spherical graphite material mixing and stirring assembly provided by this utility model are as follows: a stable support base is provided by a triangular frame structure; the stirring cylinder adopts a cylindrical stainless steel structure to ensure the purity and corrosion resistance of the material; the rotating stirring shaft passes vertically through the geometric center of the stirring cylinder to ensure the uniformity of stirring; the arc-shaped stirring blades in the spherical stirring blade assembly are radially distributed to fully cover the stirring area; the transmission connection assembly provides stable power output through a gear reduction mechanism; the overall structure is compact and reasonable, which can realize efficient mixing and stirring of spherical graphite materials, and significantly improve the uniformity of material mixing and stirring efficiency.

[0007] Based on the above technical solution, the high-performance spherical graphite material mixing and stirring assembly of this utility model can be further improved as follows:

[0008] The three support columns of the support base are all made of carbon steel pipes, with an inner diameter of 80 mm to 120 mm and a wall thickness of 8 mm to 15 mm for each support column; the connecting beam is an I-beam structure with a cross-sectional height of 150 mm to 200 mm and a flange width of 100 mm to 150 mm; the connection between the support column and the connecting beam is reinforced by angle steel reinforcing plates with a thickness of 10 mm to 16 mm.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the support column is made of carbon steel pipe with a specified inner diameter and wall thickness range, which ensures the strength and stability of the support structure; the connecting beam adopts an I-beam structure to enhance the load-bearing capacity of the overall frame; the setting of angle steel reinforcing plates further improves the structural strength of the connection; through reasonable material selection and size design, the support base can withstand various loads generated during high-torque stirring, ensuring the stability and reliability of equipment operation and extending its service life.

[0010] Furthermore, the rotating stirring shaft is a solid round steel shaft with a diameter of 60 mm to 100 mm. The material of the rotating stirring shaft is No. 45 carbon structural steel that has undergone quenching and tempering treatment. The length of the rotating stirring shaft inside the stirring cylinder is 0.7 to 0.9 times the height of the stirring cylinder. A keyway is provided at the upper end of the rotating stirring shaft. The length of the keyway is 50 mm to 80 mm, and the depth of the keyway is 0.15 to 0.25 times the shaft diameter. The rotating stirring shaft is supported in the stirring cylinder by an upper bearing seat and a lower bearing seat, and deep groove ball bearings are respectively installed in the upper bearing seat and the lower bearing seat.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the rotary stirring shaft is made of No. 45 carbon structural steel and has been quenched and tempered, which has good mechanical properties and wear resistance. The solid round steel shaft structure ensures sufficient torsional strength. The reasonable design of the shaft diameter and length ensures the optimization of the stirring effect. The keyway setting realizes a reliable connection with the transmission components. The use of deep groove ball bearings reduces the running resistance. Through precise size control and material selection, the rotary stirring shaft can operate stably under high load conditions, providing reliable power transmission for the mixing of spherical graphite materials.

[0012] Furthermore, the arc-shaped stirring blades in the spherical stirring blade assembly are helical curved surfaces, with each arc-shaped stirring blade having a radius of curvature of 200 mm to 300 mm and an arc length of 150 mm to 220 mm; the thickness of the arc-shaped stirring blades is 8 mm to 12 mm, and the arc-shaped stirring blades are formed by stamping stainless steel plates; multiple arc-shaped stirring blades are evenly distributed at a 120-degree angle on the outer circumference of the central connecting sleeve, and adjacent arc-shaped stirring blades are staggered in the vertical direction, with a stagger distance of 0.3 to 0.5 times the arc length of the arc-shaped stirring blade.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the arc-shaped stirring blades, with their spiral curved surface shape, can generate a complex stirring flow field, effectively improving mixing efficiency. By specifying the specific numerical range of the radius of curvature and arc length, the optimal geometry of the blades is ensured. The stainless steel material ensures the cleanliness of the contact with the spherical graphite material. The design of uniform distribution at a 120-degree angle and vertical staggered installation eliminates stirring dead angles, allowing the spherical graphite material to fully tumble and mix during the stirring process, significantly improving the uniformity of material dispersion and enhancing the quality stability of the final product.

[0014] Furthermore, the transmission connection assembly includes a motor, a coupling, and a reducer. The motor is a three-phase asynchronous motor with a power of 15 kW to 30 kW. The reducer is a two-stage gear reducer with a reduction ratio of 20:1 to 40:1. The output shaft of the motor is connected to the input shaft of the reducer via a flexible coupling, and the output shaft of the reducer is connected to the upper end of the rotating stirring shaft via a rigid coupling. Both the motor and the reducer are fixedly mounted on the connecting beam of the supporting base using base bolts.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the transmission connection component adopts a combination configuration of motor, coupling and reducer, which provides stable and adjustable power output; the three-phase asynchronous motor has good starting characteristics and running stability; the two-stage gear reducer realizes a suitable speed ratio and torque amplification; the reasonable combination of flexible coupling and rigid coupling not only ensures the reliability of power transmission, but also has a certain buffer protection function; the fixed installation by base bolts ensures the stability of the transmission system; and the careful design of the entire transmission chain provides a strong power guarantee for the efficient stirring of spherical graphite materials.

[0016] Furthermore, the inner wall of the stirring cylinder is provided with multiple longitudinal guide grooves, which extend along the axial direction of the stirring cylinder. Each longitudinal guide groove has a depth of 10 mm to 20 mm and a width of 15 mm to 25 mm. The number of longitudinal guide grooves is 6 to 12, and each longitudinal guide groove is distributed at an equal angle on the inner wall of the stirring cylinder. The bottom of the stirring cylinder is provided with a conical guide bottom, the cone angle of which is 45 degrees to 60 degrees, which is used to guide the spherical graphite material to converge towards the center of the stirring cylinder.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the longitudinal guide grooves set on the inner wall of the mixing cylinder can guide the material to form an orderly flow path, preventing the material from stagnating and agglomerating at the cylinder wall. The depth and width of the guide grooves are optimized to ensure the guiding effect while avoiding excessive eddy current generation. The equiangular distribution ensures the symmetry and uniformity of the flow field. The conical guide bottom allows the spherical graphite material to converge towards the central area and form better contact with the stirring blades. Through the optimized design of the internal flow channel, the mass and heat transfer effect of the stirring process is significantly improved, and the mixing quality is improved.

[0018] Furthermore, the central connecting sleeve has a cylindrical structure, with an outer diameter that is 2 to 3 times the diameter of the rotating stirring shaft and an axial length of 80 mm to 120 mm. The outer surface of the central connecting sleeve is provided with multiple mounting bosses along the circumference, the number of mounting bosses corresponding to the number of arc-shaped stirring blades, and the height of each mounting boss being 8 mm to 15 mm. The mounting bosses and the central connecting sleeve body are integrally cast.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the cylindrical structure of the central connecting sleeve provides sufficient connection strength and installation space; the ratio of the outer diameter to the shaft diameter ensures the rationality and compactness of the structure; the design of the axial length takes into account both installation reliability and weight control; the mounting bosses set on the outer surface provide precise positioning and reliable fixing for the arc-shaped stirring blades; the correspondence between the number of bosses and the number of blades ensures the uniformity of load distribution; the one-piece casting structure eliminates stress concentration and weak connection links; and the overall design realizes reliable connection and precise positioning between the stirring blades and the rotating shaft.

[0020] Furthermore, the surface of the arc-shaped stirring blade is provided with a fine texture, which is a grid-like groove with a depth of 0.5 mm to 2 mm and a spacing of 5 mm to 10 mm; the leading edge of the arc-shaped stirring blade is provided with an acute-angled cutting edge with an angle of 30 degrees to 45 degrees, which is used to enhance the shearing and mixing effect on the spherical graphite material.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the fine texture on the surface of the arc-shaped stirring blade increases the contact area and friction with the spherical graphite material, thereby improving the shearing effect of stirring; the design of the grid-like groove can generate micro-vortices, enhancing the local mixing intensity; the precise control of texture depth and spacing ensures the strengthening effect while avoiding excessive wear; the setting of the acute-angle cutting edge at the leading edge can effectively disperse and break up agglomerated graphite particles; the optimized angle design reduces energy consumption while ensuring the cutting effect; and the careful design of the surface structure significantly improves the dispersion and mixing ability of spherical graphite material.

[0022] Furthermore, the connecting flange between the mixing cylinder and the support base is connected by 16 high-strength bolts, with specifications ranging from M16 to M20 and bolt material being 40Cr alloy steel; the thickness of the flange is 25 mm to 35 mm, and the outer diameter of the flange is 1.3 to 1.5 times the outer diameter of the mixing cylinder; the flange and the mixing cylinder are connected by full welding, and the weld height is 0.6 to 0.8 times the thickness of the flange.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the connection between the mixing cylinder and the support base using 16 high-strength bolts ensures the reliability and sealing of the connection; the 40Cr alloy steel bolts have excellent mechanical properties and fatigue resistance; the reasonable design of the flange thickness and outer diameter ensures the strength requirements of the connection; the full welding connection eliminates stress concentration and leakage risks; the precise control of the weld height ensures the welding quality; and the adoption of high-strength connection method enables the entire mixing device to withstand high-speed rotation and high torque load, ensuring the structural integrity and operational safety of the equipment under harsh working conditions.

[0024] Furthermore, the fitting clearance between the rotating stirring shaft and the central connecting sleeve of the spherical stirring blade assembly is 0.05 mm to 0.15 mm, and the fastening bolts are distributed at equal angles along the circumference of the central connecting sleeve, with a number of 4 to 8 bolts; the radial clearance from the outermost end of the arc-shaped stirring blade to the inner wall of the stirring cylinder is 15 mm to 30 mm, and the arc-shaped stirring blade forms a shear gap with the inner wall of the stirring cylinder during rotation, which is used to achieve efficient shear dispersion and mixing of spherical graphite materials.

[0025] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the precise fit clearance between the rotating stirring shaft and the central connecting sleeve ensures the accuracy of transmission and the smoothness of operation; the evenly distributed fastening bolts achieve uniform load transmission; the reasonable setting of the number of bolts ensures the connection strength while avoiding over-design; the radial gap between the arc-shaped stirring blades and the inner wall of the stirring cylinder forms an effective shearing zone; the precise gap control achieves efficient shearing and dispersion of spherical graphite materials; the optimized design of the gap value ensures the stirring effect while avoiding excessive wear; and the precise fit of the overall dimensional relationship provides a reliable guarantee for high-quality mixing.

[0026] Compared with existing technologies, the beneficial effects of the high-performance spherical graphite material mixing and stirring assembly provided by this utility model are as follows: This utility model effectively solves the key technical problems in the mixing and stirring of spherical graphite materials by adopting a triangular frame support base, a vertically arranged rotating stirring shaft, a spiral curved arc stirring blade, and an inner wall guide groove design. The triangular frame structure provides a highly stable support foundation, ensuring the structural stability of the equipment during high-speed rotation. The radial distribution and staggered installation design of the spiral curved arc stirring blade eliminates dead corners in the stirring process, realizing all-round tumbling and mixing of materials. The micro-grid texture and sharp-angle cutting edge design on the blade surface enhance the ability to disperse and break up graphite particle agglomerates. The longitudinal guide groove on the inner wall of the stirring cylinder, combined with the design of the conical guide bottom, optimizes the material flow path and prevents wall stagnation. Precise clearance control achieves efficient shear mixing effect. Compared with existing technologies, the overall technical solution has significant advantages such as good mixing uniformity, high stirring efficiency, strong equipment stability, and convenient maintenance, providing a reliable technical guarantee for the industrial production of spherical graphite materials. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of a mixing and stirring assembly for a high-performance spherical graphite material;

[0029] Figure 2 A cross-sectional view of a mixing and stirring assembly for a high-performance spherical graphite material;

[0030] Figure 3 A schematic diagram of the spherical stirring blades of a mixing and stirring assembly for a high-performance spherical graphite material;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Mixing cylinder; 2. Rotary mixing shaft; 3. Spherical mixing blade assembly; 31. Central connecting sleeve; 32. Arc-shaped mixing blade; 4. Support base; 5. Transmission connection assembly. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figures 1-3 The diagram shows a first embodiment of a high-performance spherical graphite material mixing and stirring assembly provided by this utility model. In this embodiment, it includes: a stirring cylinder 1, a rotating stirring shaft 2, a spherical stirring blade assembly 3, a support base 4, and a transmission connection assembly 5. The support base 4 has a triangular frame structure, with support columns at its three vertices. The upper ends of the three support columns are fixedly connected by a connecting beam to form a stable triangular support frame. The stirring cylinder 1 is a cylindrical stainless steel structure, and its bottom is fixedly connected to the center of the support base 4 via a flange. The rotating stirring shaft 2 passes vertically through the stirring cylinder. The upper end of the rotating stirring shaft 2 extends out of the top of the stirring cylinder 1 and is connected to the input end of the transmission connection assembly 5 via a keyway at the geometric center of the cylinder 1. The spherical stirring blade assembly 3 is fixedly installed in the lower middle part of the rotating stirring shaft 2. The spherical stirring blade assembly 3 includes a central connecting sleeve 31 and multiple arc-shaped stirring blades 32. The central connecting sleeve 31 is fitted onto the rotating stirring shaft 2 and locked by fastening bolts. The multiple arc-shaped stirring blades 32 are radially distributed on the outer circumferential surface of the central connecting sleeve 31. The transmission connection assembly 5 is installed above the support base 4. The transmission connection assembly 5 drives the rotating stirring shaft 2 to rotate through a gear reduction mechanism.

[0035] In the aforementioned technical solution, the three support columns of the support base 4 are all made of carbon steel pipes, with an inner diameter of 80 mm to 120 mm and a wall thickness of 8 mm to 15 mm for each support column; the connecting beam is an I-beam structure with a cross-sectional height of 150 mm to 200 mm and a flange width of 100 mm to 150 mm; the connection between the support column and the connecting beam is reinforced by angle steel reinforcing plates with a thickness of 10 mm to 16 mm.

[0036] Furthermore, in the above technical solution, the rotary stirring shaft 2 is a solid round steel shaft with a shaft diameter of 60 mm to 100 mm. The material of the rotary stirring shaft 2 is No. 45 carbon structural steel that has undergone quenching and tempering treatment. The length of the rotary stirring shaft 2 inside the stirring cylinder 1 is 0.7 to 0.9 times the height of the stirring cylinder 1. A keyway is provided at the upper end of the rotary stirring shaft 2. The length of the keyway is 50 mm to 80 mm, and the depth of the keyway is 0.15 to 0.25 times the shaft diameter. The rotary stirring shaft 2 is supported inside the stirring cylinder 1 by an upper bearing seat and a lower bearing seat, and deep groove ball bearings are respectively installed in the upper bearing seat and the lower bearing seat.

[0037] Furthermore, in the above technical solution, the arc-shaped stirring blades 32 in the spherical stirring blade assembly 3 are spiral curved, with each arc-shaped stirring blade 32 having a radius of curvature of 200 mm to 300 mm and an arc length of 150 mm to 220 mm; the thickness of the arc-shaped stirring blades 32 is 8 mm to 12 mm, and the arc-shaped stirring blades 32 are formed by stamping stainless steel plates; multiple arc-shaped stirring blades 32 are evenly distributed at a 120-degree angle on the outer circumference of the central connecting sleeve 31, and adjacent arc-shaped stirring blades 32 are staggered in the vertical direction, with a stagger distance of 0.3 to 0.5 times the arc length of the arc-shaped stirring blades 32.

[0038] Furthermore, in the above technical solution, the transmission connection assembly 5 includes a motor, a coupling, and a reducer. The motor is a three-phase asynchronous motor with a power of 15 kW to 30 kW. The reducer is a two-stage gear reducer with a reduction ratio of 20:1 to 40:1. The output shaft of the motor is connected to the input shaft of the reducer through a flexible coupling, and the output shaft of the reducer is connected to the upper end of the rotating stirring shaft 2 through a rigid coupling. Both the motor and the reducer are fixedly mounted on the connecting crossbeam of the support base 4 by base bolts.

[0039] Furthermore, in the above technical solution, the inner wall surface of the stirring cylinder 1 is provided with multiple longitudinal guide grooves, which extend along the axial direction of the stirring cylinder 1. The depth of each longitudinal guide groove is 10 mm to 20 mm, and the width of the groove is 15 mm to 25 mm. The number of longitudinal guide grooves is 6 to 12, and each longitudinal guide groove is distributed at an equal angle on the inner wall surface of the stirring cylinder 1. The bottom of the stirring cylinder 1 is provided with a conical guide bottom, the cone angle of which is 45 degrees to 60 degrees, which is used to guide the spherical graphite material to converge towards the center of the stirring cylinder 1.

[0040] Furthermore, in the above technical solution, the central connecting sleeve 31 has a cylindrical structure, the outer diameter of the central connecting sleeve 31 is 2 to 3 times the diameter of the rotating stirring shaft 2, and the axial length of the central connecting sleeve 31 is 80 mm to 120 mm; the outer surface of the central connecting sleeve 31 is provided with multiple mounting bosses along the circumference, the number of mounting bosses corresponds to the number of arc-shaped stirring blades 32, the height of each mounting boss is 8 mm to 15 mm, and the mounting bosses and the body of the central connecting sleeve 31 are integrally cast.

[0041] Furthermore, in the above technical solution, the surface of the arc-shaped stirring blade 32 is provided with fine texture, which is a grid-like groove with a depth of 0.5 mm to 2 mm and a spacing of 5 mm to 10 mm; the leading edge of the arc-shaped stirring blade 32 is provided with an acute-angle cutting edge with an angle of 30 degrees to 45 degrees, which is used to enhance the shearing and mixing effect on the spherical graphite material.

[0042] Furthermore, in the above technical solution, the connecting flange between the mixing cylinder 1 and the support base 4 is connected by 16 high-strength bolts. The specifications of the high-strength bolts are M16 to M20, and the bolt material is 40Cr alloy steel. The thickness of the flange is 25 mm to 35 mm, and the outer diameter of the flange is 1.3 to 1.5 times the outer diameter of the mixing cylinder 1. The flange and the mixing cylinder 1 are connected by full welding, and the weld height is 0.6 to 0.8 times the thickness of the flange.

[0043] Furthermore, in the above technical solution, the fitting clearance between the rotating stirring shaft 2 and the central connecting sleeve 31 of the spherical stirring blade assembly 3 is 0.05 mm to 0.15 mm, the fastening bolts are distributed at equal angles along the circumference of the central connecting sleeve 31, and the number of fastening bolts is 4 to 8; the radial clearance from the outermost end of the arc-shaped stirring blade 32 to the inner wall of the stirring cylinder 1 is 15 mm to 30 mm, and the arc-shaped stirring blade 32 forms a shear gap with the inner wall of the stirring cylinder 1 during rotation, which is used to achieve efficient shear dispersion and mixing of spherical graphite materials.

[0044] The following is a specific embodiment 1 of this utility model: In this embodiment, the support base 4 adopts an equilateral triangular frame structure. The three support columns are made of seamless carbon steel pipes with an outer diameter of 114 mm and a wall thickness of 12 mm. The column height is 1800 mm, and the center distance between the three columns is 2000 mm, forming a stable triangular support foundation. The connecting beams are made of 160×100×8 H-beams. The three beams form a triangular connecting frame at the top of the support columns. The connection is reinforced with 12 mm thick angle steel reinforcing plates. All welded parts are fully welded and subjected to post-weld heat treatment to eliminate welding stress. The stirring cylinder 1 is made of 304 stainless steel cylinder with an inner diameter of 1200 mm and a height of 1500 mm. The cylinder wall thickness is 10 mm. The bottom of the cylinder is a conical structure with a cone angle of 50 degrees. A discharge port with a diameter of 200 mm is set at the conical bottom. The discharge port is equipped with a gate valve to control the material discharge. Eight longitudinal guide grooves are arranged along the axial direction on the inner wall of the cylinder. Each guide groove is 15 mm deep and 20 mm wide, and the grooves are distributed at equal angles to guide the material to form an orderly flow. The rotating stirring shaft 2 is made of a solid round shaft of No. 45 steel with a diameter of 80 mm and a total length of 2100 mm, of which 1200 mm extends into the cylinder. The shaft surface is heat-treated to a hardness of HRC35-40. A keyway with a length of 60 mm and a depth of 12 mm is provided at the upper end of the stirring shaft for connection with the transmission components. The shaft is supported by two deep groove ball bearing seats, with a bearing specification of 6216-2RS. The bearing seats are made of cast iron and equipped with a sealing device to prevent material from entering the bearing cavity. The spherical stirring blade assembly 3 is installed on the shaft at a position 600 mm from the bottom of the cylinder. The central connecting sleeve 31 is made of stainless steel sleeve with an inner diameter of 82 mm, an outer diameter of 200 mm, and a length of 100 mm. Three mounting bosses are distributed at equal angles on the outer surface of the sleeve, and each boss is 12 mm high. The arc-shaped stirring blades 32 are stamped from 6mm thick 304 stainless steel plates. Each blade has a radius of curvature of 250mm, an arc length of 180mm, and a radial extension length of 300mm. Three blades are distributed at a 120-degree angle on the outer periphery of the central sleeve, with adjacent blades staggered by 80mm in the vertical direction. The blade surface is machined with a grid-like groove texture with a depth of 1mm and a spacing of 8mm, and the leading edge is machined into a 35-degree acute-angle cut edge. The blades are fixed to the mounting boss with M10 bolts, with each blade connected by 4 bolts. The transmission connection assembly 5 includes a 22kW three-phase asynchronous motor, a flexible coupling, a two-stage gear reducer, and a rigid coupling. The reducer has a reduction ratio of 30:1 and an output speed of 50 rpm. The motor is mounted on a crossbeam on one side of the support base 4 and fixed with anchor bolts. The entire equipment has a processing capacity of 500 kg of spherical graphite material per batch, a stirring time of 20 minutes, and a mixing uniformity of over 98%. The equipment operates smoothly with minimal vibration and noise levels below 80 decibels, meeting the requirements of industrial production environments.Through optimized geometric design and precise manufacturing processes, this embodiment achieves efficient mixing of spherical graphite materials, significantly improving product quality and production efficiency, and providing reliable technical equipment for mass production.

[0045] The following is another specific embodiment 2 of this utility model: This embodiment 2 is based on embodiment 1, and the structure of the arc-shaped stirring blade 32 is optimized and improved. While maintaining the basic geometric shape of the blade, the number of blades is increased from 3 to 4. The 4 blades are distributed at a 90-degree angle around the outer periphery of the central connecting sleeve 31, and the vertical misalignment distance between adjacent blades is adjusted to 60 mm. To accommodate the arrangement of 4 blades, the length of the central connecting sleeve 31 is increased to 120 mm, and 4 mounting bosses are provided on the outer surface. At the same time, the surface texture of the blade is refined, and the spacing of the grid-like grooves is reduced from 8 mm to 6 mm, while the groove depth remains unchanged at 1 mm. This denser surface texture can generate a stronger shearing effect, further improving the dispersion effect on graphite particle agglomerates. In addition, a reinforcing rib is added at the radial center of the blade. The reinforcing rib is 5 mm high and 3 mm thick, extending along the arc length of the blade, to improve the structural strength and bending stiffness of the blade. To accommodate the increased number of blades, the motor power of the transmission system was increased to 30 kW, the reduction ratio of the reducer was adjusted to 25:1, and the output speed was increased to 60 rpm. Through these improvements, the stirring intensity of this embodiment was increased by approximately 25% compared to Embodiment 1, and the mixing time was shortened to 15 minutes. This makes it particularly suitable for processing spherical graphite materials with high viscosity or high agglomeration, significantly improving production efficiency while ensuring mixing quality.

[0046] The following is another specific embodiment 3 of this utility model: This embodiment 3 is based on embodiment 1, and the internal structure of the stirring cylinder 1 is reinforced. In addition to the original longitudinal guide channels, an annular guide platform is added. Annular guide platforms are respectively set at the upper, middle, and lower heights of the inner wall of the stirring cylinder 1. Each guide platform is 30 mm wide and 8 mm high, with its surface inclined downwards at a 15-degree angle to guide the material towards the center area of ​​the cylinder. At the same time, the number of longitudinal guide channels is increased from 8 to 12, the channel depth is increased to 20 mm, and the channel width remains unchanged at 20 mm. More and deeper guide channels can more effectively break up the stagnant zone near the wall, promoting the overall circulation of the material. A spiral guide plate is set in the conical area at the bottom of the cylinder. The guide plate is spirally distributed along the conical surface, with a spiral angle of 30 degrees and a plate height of 10 mm, to guide the material at the bottom to roll upwards, avoiding sedimentation at the bottom of the cone. To accommodate the increased complexity of the internal structure, the length of the stirring shaft was adjusted accordingly, and the installation position of the spherical stirring blade assembly 3 was moved down to 400 mm from the bottom of the cylinder, ensuring a more rational fit between the blades and the various flow guiding structures. Through these enhanced internal structural designs, this embodiment achieves more precise control over material flow, eliminating all possible stagnation and dead zones, further improving mixing uniformity to over 99.5%. This makes it particularly suitable for the production of high-end spherical graphite materials where extremely high mixing quality is required, providing a more reliable guarantee for product quality stability.

[0047] Specifically, the principle of this invention is as follows: Based on the principles of fluid mechanics and particle mechanics, this invention achieves efficient mixing and dispersion of spherical graphite materials by optimizing the geometry and motion of the stirrer. The core of the technical principle lies in creating a composite stirring flow field and multiple mixing mechanisms. First, the spiral curved stirring blades generate axial and radial composite flows during rotation, forming a three-dimensional spiral flow field. This causes the spherical graphite particles to generate complex motion trajectories within the stirring cylinder, avoiding the dead zones of a single flow mode. Second, the radial distribution and vertically staggered installation design of the curved stirring blades ensure that materials at different heights receive sufficient stirring, achieving a three-dimensional mixing effect. Third, the fine mesh texture on the blade surface generates microscopic shear force upon contact with graphite particles, effectively disrupting van der Waals forces and electrostatic forces between particles, promoting the dispersion of agglomerates. Fourth, the acute-angle cutting edge design utilizes the principle of high-speed shearing to mechanically break up large particle agglomerates, achieving uniform particle size. Fifth, the longitudinal guide channels on the inner wall of the mixing cylinder guide the material to form an orderly circulating flow by changing the boundary layer flow characteristics, preventing wall stagnation and localized overheating. Sixth, precise control of the fitting clearance creates a high-shear zone between the blades and the cylinder wall, utilizing the Couette flow principle to achieve shear dispersion of graphite particles. The entire technical solution, through the synergistic effect of multiple mixing mechanisms, significantly improves the mixing quality and stirring efficiency of spherical graphite materials.

[0048] The specific operation or use method of this utility model is as follows: First, install and debug the equipment. Place the support base on a horizontal foundation and adjust the verticality of the support column using a level to ensure the stability of the triangular frame structure. When installing the mixing cylinder, align the bottom flange of the cylinder with the center flange of the support base, and tighten 16 high-strength bolts evenly in a diagonal sequence to ensure a tight connection. When installing the rotating mixing shaft, first install the lower bearing seat into the bottom of the mixing cylinder, then insert the mixing shaft and install the upper bearing seat, adjusting the axial position so that the spherical mixing blade assembly is in the optimal position in the lower middle part of the cylinder. When connecting the transmission system, first install the reducer and motor, and connect them to the keyway at the upper end of the mixing shaft through a coupling, checking the coaxiality and clearance of the transmission chain. Preparatory work before operation includes checking the tightness of each connection, adding grease to the bearings, and checking the operation of the transmission system. During the feeding operation, the mixer should be started and run idle for 2-3 minutes for preheating, and then spherical graphite material should be continuously and evenly fed through the feeding port at the top of the cylinder. The feeding speed should match the mixer speed. During the mixing process, the speed and mixing time should be strictly controlled. Generally, the speed should be controlled at 60-120 revolutions per minute, and the mixing time should be determined according to the material characteristics and mixing requirements, typically 15-30 minutes. After mixing is complete, stop the machine and discharge the mixed material through the outlet at the bottom of the cylinder. Routine maintenance includes periodically checking the bearing lubrication, cleaning residual material from the inner wall of the cylinder and the surface of the blades, checking for loose fasteners, and recording equipment operating parameters.

Claims

1. A mixing and stirring assembly for high-performance spherical graphite materials, characterized in that, include: Stirring cylinder, rotating stirring shaft, spherical stirring blade assembly, support base and transmission connection assembly; The support base has a triangular frame structure, with support columns at its three vertices. The upper ends of the three support columns are fixedly connected by a connecting beam to form a stable triangular support frame. The stirring cylinder is a cylindrical stainless steel structure, with its bottom fixedly connected to the center of the support base via a flange. The rotating stirring shaft passes vertically through the geometric center of the stirring cylinder, with its upper end extending beyond the top of the cylinder and connected to the input end of the transmission connection assembly via a keyway. The spherical stirring blade assembly is fixedly installed in the lower middle part of the rotating stirring shaft. The spherical stirring blade assembly includes a central connecting sleeve and multiple arc-shaped stirring blades. The central connecting sleeve is fitted onto the rotating stirring shaft and locked by fastening bolts. The multiple arc-shaped stirring blades are radially distributed on the outer circumference of the central connecting sleeve. The transmission connection assembly is installed above the support base and drives the rotating stirring shaft to rotate via a gear reduction mechanism.

2. The mixing and stirring assembly for high-performance spherical graphite material according to claim 1, characterized in that, The three support columns of the support base are all made of carbon steel pipes, with an inner diameter of 80 mm to 120 mm and a wall thickness of 8 mm to 15 mm for each support column; the connecting beam is an I-beam structure with a cross-sectional height of 150 mm to 200 mm and a flange width of 100 mm to 150 mm; the connection between the support column and the connecting beam is reinforced by angle steel reinforcing plates with a thickness of 10 mm to 16 mm.

3. The mixing and stirring assembly for high-performance spherical graphite material according to claim 2, characterized in that, The rotating stirring shaft is a solid round steel shaft with a diameter of 60 mm to 100 mm. The material of the rotating stirring shaft is No. 45 carbon structural steel that has been quenched and tempered. The length of the rotating stirring shaft inside the stirring cylinder is 0.7 to 0.9 times the height of the stirring cylinder. A keyway is provided at the upper end of the rotating stirring shaft. The length of the keyway is 50 mm to 80 mm, and the depth of the keyway is 0.15 to 0.25 times the shaft diameter. The rotating stirring shaft is supported in the stirring cylinder by an upper bearing seat and a lower bearing seat. Deep groove ball bearings are installed in the upper bearing seat and the lower bearing seat, respectively.

4. The mixing and stirring assembly for high-performance spherical graphite material according to claim 3, characterized in that, The arc-shaped stirring blades in the spherical stirring blade assembly are spiral curved, with each arc-shaped stirring blade having a radius of curvature of 200 mm to 300 mm and an arc length of 150 mm to 220 mm. The thickness of the arc-shaped stirring blades is 8 mm to 12 mm, and the arc-shaped stirring blades are made of stainless steel sheet by stamping. Multiple arc-shaped stirring blades are evenly distributed at a 120-degree angle on the outer circumference of the central connecting sleeve. Adjacent arc-shaped stirring blades are staggered in the vertical direction, with a stagger distance of 0.3 to 0.5 times the arc length of the arc-shaped stirring blade.

5. The mixing and stirring assembly for high-performance spherical graphite material according to claim 4, characterized in that, The transmission connection assembly includes a motor, a coupling, and a reducer. The motor is a three-phase asynchronous motor with a power of 15 kW to 30 kW. The reducer is a two-stage gear reducer with a reduction ratio of 20:1 to 40:

1. The output shaft of the motor is connected to the input shaft of the reducer via a flexible coupling, and the output shaft of the reducer is connected to the upper end of the rotating stirring shaft via a rigid coupling. Both the motor and the reducer are fixedly mounted on the connecting beam of the supporting base using base bolts.

6. The mixing and stirring assembly for high-performance spherical graphite material according to claim 5, characterized in that, The inner wall of the stirring cylinder is provided with multiple longitudinal guide grooves, which extend along the axial direction of the stirring cylinder. Each longitudinal guide groove has a depth of 10 mm to 20 mm and a width of 15 mm to 25 mm. There are 6 to 12 longitudinal guide grooves, which are distributed at equal angles on the inner wall of the stirring cylinder. The bottom of the stirring cylinder is provided with a conical guide bottom with a cone angle of 45 degrees to 60 degrees, which is used to guide the spherical graphite material to converge towards the center of the stirring cylinder.

7. The mixing and stirring assembly for high-performance spherical graphite material according to claim 6, characterized in that, The central connecting sleeve has a cylindrical structure. The outer diameter of the central connecting sleeve is 2 to 3 times the diameter of the rotating stirring shaft, and the axial length of the central connecting sleeve is 80 mm to 120 mm. Multiple mounting bosses are provided on the outer surface of the central connecting sleeve along the circumference. The number of mounting bosses corresponds to the number of arc-shaped stirring blades. The height of each mounting boss is 8 mm to 15 mm. The mounting bosses and the central connecting sleeve body are integrally cast.

8. The mixing and stirring assembly for high-performance spherical graphite material according to claim 7, characterized in that, The surface of the arc-shaped stirring blade is provided with a fine texture, which is a grid-like groove with a depth of 0.5 mm to 2 mm and a spacing of 5 mm to 10 mm. The leading edge of the arc-shaped stirring blade is provided with an acute-angled cutting edge with an angle of 30 degrees to 45 degrees, which is used to enhance the shearing and mixing effect on the spherical graphite material.

9. The mixing and stirring assembly for high-performance spherical graphite material according to claim 8, characterized in that, The connecting flange between the mixing cylinder and the support base is connected by 16 high-strength bolts. The specifications of the high-strength bolts are M16 to M20, and the bolt material is 40Cr alloy steel. The thickness of the flange is 25 mm to 35 mm, and the outer diameter of the flange is 1.3 to 1.5 times the outer diameter of the mixing cylinder. The flange and the mixing cylinder are connected by full welding, and the weld height is 0.6 to 0.8 times the thickness of the flange.

10. A mixing and stirring assembly for high-performance spherical graphite material according to claim 9, characterized in that, The fitting clearance between the rotating stirring shaft and the central connecting sleeve of the spherical stirring blade assembly is 0.05 mm to 0.15 mm. The fastening bolts are distributed at equal angles along the circumference of the central connecting sleeve, and the number of fastening bolts is 4 to 8. The radial clearance from the outermost end of the arc-shaped stirring blade to the inner wall of the stirring cylinder is 15 mm to 30 mm. During the rotation, the arc-shaped stirring blade forms a shear gap with the inner wall of the stirring cylinder to achieve efficient shear dispersion and mixing of spherical graphite materials.

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