Raymond mill front end anti-blocking feeding structure

Abstract

The utility model provides a kind of Raymond mill front end anti-blocking feed structure, belong to Raymond mill anti-blocking technical field, this Raymond mill front end anti-blocking feed structure, including: feed cylinder, dredging cleaning component, vibration dispersion component, flow guide adjusting component and support installation component;Feed cylinder is conical platform, upper end has feed inlet, lower end has discharge port, discharge port diameter is less than feed inlet;Dredging cleaning component includes cleaning shaft, cleaning blade and drive link;Cleaning shaft is through feed cylinder, upper end is outside, lower end is close to discharge port;At least 3 helical twist shape cleaning blades are distributed on the equal angle of rotation of the shaft, the clearance between outer edge and cylinder inner wall is 2 to 5 millimeters;Drive link one end is connected with the upper end of the shaft through universal joint, and the other end is connected with external power source;The utility model can solve the technical problems that Raymond mill feeding system is prone to material blockage in prior art, which leads to equipment downtime and production efficiency decline.

Description

Technical Field

[0001] This utility model belongs to the field of Raymond mill anti-clogging technology, specifically, it relates to an anti-clogging feeding structure at the front end of a Raymond mill. Background Technology

[0002] Raymond mills, as important grinding equipment, are widely used in material grinding and processing in industries such as building materials, chemicals, metallurgy, and power, especially in the ultrafine grinding of non-metallic minerals such as limestone, calcite, talc, and gypsum. During the operation of a Raymond mill, the stability of the feeding system directly affects the production efficiency and product quality of the entire grinding system. Existing Raymond mill feeding devices typically employ simple funnel-type or pipe-type feeding structures. These traditional feeding methods often result in blockages at the feed inlet or in the feed pipe when processing materials containing moisture, stickiness, or uneven particle size distribution. Especially in humid environments or when processing materials containing organic matter, materials easily adhere to the inner wall of the feeding device, gradually accumulating and forming blockages. In severe cases, manual cleaning is required after machine shutdown, which not only affects production efficiency but also increases the labor intensity and safety risks for operators. Existing solutions mainly include increasing the feed inlet size, installing vibrating feeders, and using pneumatic-assisted feeding. However, these methods often suffer from problems such as complex structure, high energy consumption, and difficult maintenance, and their anti-clogging effect is still not ideal for certain special materials. Therefore, developing a Raymond mill front-end anti-clogging feeding structure that is simple in structure, reliable in effect, and widely applicable has significant practical significance and application value. Utility Model Content

[0003] In view of this, the present invention provides a Raymond mill front-end anti-clogging feeding structure, which can solve the technical problem that material blockage in the Raymond mill feeding system in the prior art easily leads to equipment downtime and reduced production efficiency.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a Raymond mill front-end anti-clogging feeding structure, comprising: a feeding cylinder, a cleaning and unblocking component, a vibration dispersion component, a flow guiding and adjusting component, and a support and mounting component; the feeding cylinder has a frustum-shaped conical structure, with a feed inlet at the upper end and a discharge outlet at the lower end, the diameter of the discharge outlet being smaller than the diameter of the feed inlet; the cleaning and unblocking component includes a cleaning shaft, cleaning blades, and a drive connecting rod, the cleaning shaft being installed through the axial center of the feeding cylinder, the upper end of the cleaning shaft extending to the outside of the feeding cylinder, and the lower end of the cleaning shaft located inside the feeding cylinder and close to the discharge outlet; at least three cleaning blades are fixedly connected to the cleaning shaft at equal radial angles, each cleaning blade being spirally twisted, the outer edge of the cleaning blade maintaining a gap of 2 mm to 5 mm with the inner wall of the feeding cylinder; one end of the drive connecting rod is connected to the upper end of the cleaning shaft via a universal joint, and the other end of the drive connecting rod is connected to an external power source.

[0006] The technical advantages of the anti-clogging feeding structure at the front end of a Raymond mill provided by this utility model are as follows: By setting a truncated cone-shaped feeding cylinder structure, the upper part is larger than the lower part, allowing the material to naturally converge towards the discharge port under the action of gravity, reducing the residence time of the material in the cylinder. The cleaning shaft in the unblocking and cleaning component, together with the spiral twisted cleaning blades, continuously agitates and pushes the material in the cylinder during rotation, effectively preventing the material from clumping and adhering in the cylinder. The precise gap design between the cleaning blades and the inner wall of the cylinder ensures the cleaning effect while avoiding excessive wear. The drive linkage connected by a universal joint can adapt to different installation angles of the external power source, improving the adaptability and stability of the system.

[0007] Based on the above technical solution, the anti-clogging feeding structure at the front end of the Raymond mill of this utility model can be further improved as follows:

[0008] The vibration dispersion assembly includes a vibration ring, an exciter, and connecting springs. The vibration ring is sleeved on the middle section of the outer wall of the feed cylinder, and the vibration ring and the feed cylinder are connected by at least four connecting springs evenly distributed along the circumference. The exciter is fixedly installed on the vibration ring, and the vibration direction of the exciter is at a 45-degree angle to the axial direction of the feed cylinder. The vibration generated by the exciter is transmitted to the feed cylinder through the connecting springs.

[0009] The beneficial effects of the above-mentioned improved scheme are as follows: The mechanical vibration generated by the vibrator in the vibration dispersion component is transmitted to the feeding cylinder through the connecting spring, causing the entire feeding system to generate high-frequency micro-amplitude vibration. This vibration can effectively break the electrostatic adsorption and surface tension binding between material particles, preventing fine particles from agglomerating. The installation method of the vibrator at a 45-degree angle to the cylinder axis generates both axial vibration to promote material falling and radial vibration to enhance the material dispersion effect. The buffering effect of the connecting spring avoids impact damage to the cylinder structure caused by vibration, extending the service life of the equipment.

[0010] Furthermore, the flow guiding and adjusting assembly includes an adjusting valve plate, a valve plate rotating shaft, and an operating handle; the adjusting valve plate is located inside the discharge port, and the adjusting valve plate has a fan-shaped structure, with the chord length of the adjusting valve plate being equal to the diameter of the discharge port; the valve plate rotating shaft passes through the discharge port wall perpendicular to the axial direction of the feeding cylinder, with one end of the valve plate rotating shaft fixedly connected to the radial center position of the adjusting valve plate, and the other end of the valve plate rotating shaft extending to the outside of the feeding cylinder and fixedly connected to the operating handle; the adjusting valve plate rotates around the valve plate rotating shaft to adjust the effective cross-sectional area of ​​the discharge port.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The design of the fan-shaped regulating valve plate in the flow guiding and regulating assembly allows for precise control of the effective cross-sectional area of ​​the discharge port through rotational adjustment, thereby regulating the material flow rate and velocity. The vertical installation of the valve plate shaft ensures the stability and sealing of the valve plate rotation, and the external design of the operating handle facilitates real-time adjustment by the operator according to production needs. The flow channel formed by the fan-shaped valve plate in the partially closed state has a guiding function, which can guide the material to flow out in a specific direction, avoiding eddies and backflow near the discharge port, and further preventing blockage.

[0012] Furthermore, the support and installation assembly includes a base, columns, and connecting flanges; the base has a rectangular frame structure, and columns are fixedly extended upwards from the four corners of the base, with the columns made of Q235 carbon steel; the connecting flange is fixedly installed around the upper feed inlet of the feed cylinder, and the connecting flange is connected to the top of the column by bolts, with a through hole coaxial with the feed inlet on the connecting flange, the diameter of the through hole being 3 mm to 8 mm larger than the diameter of the feed inlet.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the supporting mounting components provide a stable installation foundation; the rectangular frame base has good structural rigidity and stability; and the symmetrical arrangement of the four columns ensures the vertical installation accuracy of the feeding cylinder. The annular design of the connecting flange forms a reliable connection with the feeding cylinder, and the bolted connection facilitates disassembly and maintenance. The design of the through-hole diameter being larger than the feed inlet diameter provides a buffer space for material entry, avoiding wear caused by direct impact of material on the feed inlet edge. The Q235 carbon steel column material has sufficient strength and toughness to withstand various loads and vibrations during equipment operation.

[0014] Furthermore, the inner wall surface of the feeding cylinder is provided with a spiral guide groove. The spiral direction of the spiral guide groove is the same as that of the cleaning blade. The pitch of the spiral guide groove is twice that of the cleaning blade. The depth of the spiral guide groove is 2 mm to 4 mm. The spiral guide groove is continuously distributed along the axial direction of the inner wall of the feeding cylinder.

[0015] The beneficial effects of the above-mentioned improvement scheme are as follows: the spiral guide grooves on the inner wall of the feed cylinder work synergistically with the cleaning blades. When the cleaning shaft rotates, the spiral guide grooves guide the material to move downwards along the spiral trajectory, enhancing the axial conveying capacity of the material. The design of the spiral guide groove pitch being twice that of the cleaning blade pitch allows the material to be more fully stirred and dispersed during movement, effectively breaking the agglomeration of the material. Precise control of the guide groove depth ensures both the guiding effect and avoids excessive material retention within the groove. The continuously distributed spiral guide grooves form a complete material conveying channel, eliminating conveying dead zones and stagnant areas.

[0016] Furthermore, the surface of the cleaning shaft is provided with a wear-resistant layer, which is made of tungsten carbide coating material with a coating thickness of 0.5 mm to 1.2 mm; the cleaning shaft is provided with a tapered transition section at the lower end near the discharge port, the tapered transition section has a cone angle of 15 degrees to 25 degrees, and the tapered transition section is connected to the main body of the cleaning shaft by an arc transition with a radius of 3 mm to 6 mm.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: Cleaning the tungsten carbide anti-wear layer on the shaft surface significantly improves the shaft's wear resistance, extends the equipment's service life, and reduces maintenance downtime caused by wear. The tapered transition section design makes the fit between the shaft and the discharge port smoother, avoiding material accumulation and jamming at this point. The 15- to 25-degree tapered angle design ensures smooth material passage while maintaining appropriate flow rate control. The arc transition connection eliminates stress concentration at sharp corners, improving the shaft's fatigue strength. The tungsten carbide coating thickness is controlled within a reasonable range, ensuring wear resistance while avoiding the risk of coating peeling.

[0018] Furthermore, the outer wall of the feeding cylinder is provided with multiple reinforcing ribs, which extend along the axial direction of the feeding cylinder and have a T-shaped cross-section.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the axial stiffening ribs on the outer wall of the feed cylinder enhance the structural rigidity and deformation resistance of the cylinder, maintaining the geometric accuracy and internal clearance of the cylinder under vibration and impact loads. The T-shaped cross-section stiffening rib design has the optimal bending section modulus, saving material and achieving high strength. The axially distributed stiffening ribs also act as heat dissipation fins, increasing the heat dissipation area of ​​the cylinder, effectively reducing the cylinder temperature, preventing material adhesion and agglomeration caused by excessive temperature, and improving the anti-clogging effect.

[0020] Furthermore, the edge of the cleaning blade is serrated, with the tooth tip angle being 30 to 45 degrees and the spacing between adjacent serrations being 8 to 12 millimeters.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The serrated design of the blade edges enhances the cutting and crushing ability of adhering materials, especially for materials with high moisture content or a certain degree of stickiness. The 30- to 45-degree tooth tip angle design ensures cutting effect while avoiding wear and breakage caused by excessive sharp angles. The reasonable serration spacing ensures continuous cutting action and eliminates cutting blind spots. The serrated structure also plays a certain role in cleaning the inner wall of the cylinder during rotation, preventing long-term accumulation of materials on the inner wall and maintaining good anti-clogging performance.

[0022] Furthermore, the surface of the regulating valve plate is provided with a textured surface, the textured surface being arranged in a wave pattern, the wave height being 1 mm to 2 mm, and the wavelength being 5 mm to 8 mm.

[0023] The beneficial effects of the above-mentioned improvement scheme are as follows: The wavy texture on the surface of the regulating valve plate increases the friction between the valve plate and the material, improving the valve plate's control accuracy over material flow. The presence of the texture creates micro-turbulence on the valve plate surface, enhancing the material dispersion effect and preventing the aggregation and deposition of fine particles. The continuity of the wavy texture ensures the uniformity of material flow, avoiding uneven discharge caused by excessively high or low local flow velocities. The appropriate depth and wavelength design of the texture both play a regulating role and avoid excessive resistance loss.

[0024] Furthermore, the connecting spring is a cylindrical helical spring with a wire diameter of 6 mm to 10 mm, a mean diameter of 40 mm to 60 mm, and an effective number of coils of 8 to 12.

[0025] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the precise parameter design of the connecting spring ensures the best vibration transmission effect; the cylindrical helical spring structure has good axial and radial stiffness characteristics; the reasonable ratio of wire diameter and mean diameter ensures the balance between the spring's load-bearing capacity and deformation capacity; the control of the effective number of coils gives the spring appropriate flexibility, which can both transmit vibration energy and buffer impact loads; the standardized design of spring parameters facilitates manufacturing and replacement, reduces maintenance costs; and the uniform distribution of springs ensures the consistency and stability of the feed cylinder vibration.

[0026] Compared with existing technologies, the beneficial effects of the anti-clogging feeding structure at the front end of a Raymond mill provided by this utility model are as follows: This utility model, through its innovative anti-clogging feeding structure design, fundamentally solves the clogging problem in the Raymond mill feeding process, significantly improving production efficiency and equipment reliability. The spiral blade rotation mechanism of the unblocking and cleaning component can continuously agitate and push the material in the feeding cylinder, effectively preventing material retention and agglomeration in the cylinder, especially showing excellent anti-clogging ability for materials with high moisture content or viscosity. The high-frequency micro-amplitude vibration generated by the vibration dispersion component can destroy the electrostatic adsorption and surface tension between material particles, preventing fine particles from agglomerating and eliminating the conditions for clogging at the source. The flow guiding and regulating component, by precisely controlling the discharge flow rate and direction, avoids material accumulation and backflow at the discharge port, ensuring smooth material transportation. The entire system adopts a mechanical structure design, requiring no complex control system, and features simple structure, convenient maintenance, and reliable operation. It is suitable for various harsh industrial production environments, providing a reliable guarantee for the continuous and stable operation of the Raymond mill. 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 This is a schematic diagram of an anti-clogging feeding structure at the front end of a Raymond mill;

[0029] Figure 2 A schematic longitudinal section of a Raymond mill front-end anti-clogging feeding structure;

[0030] Figure 3 A schematic cross-sectional view of a Raymond mill front-end anti-clogging feeding structure;

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

[0032] 1. Feed cylinder; 2. Unblocking and cleaning assembly; 21. Cleaning shaft; 22. Cleaning blades; 23. Drive linkage; 3. Vibration dispersion assembly; 31. Vibrating ring; 32. Vibrator; 33. Connecting spring; 4. Flow guiding and adjusting assembly; 5. Support and mounting 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 an anti-clogging feeding structure for a Raymond mill front end provided by this utility model. In this embodiment, it includes: a feeding cylinder 1, a cleaning and unblocking assembly 2, a vibration dispersion assembly 3, a flow guiding and adjusting assembly 4, and a support and mounting assembly 5. The feeding cylinder 1 has a frustum-shaped conical structure, with an inlet at the upper end and an outlet at the lower end, the diameter of which is smaller than the diameter of the inlet. The cleaning and unblocking assembly 2 includes a cleaning shaft 21, cleaning blades 22, and a drive connecting rod 23. The cleaning shaft 21 moves along the feeding cylinder... The axial center position of the feed cylinder 1 is through the feed cylinder 1. The upper end of the cleaning shaft 21 extends to the outside of the feed cylinder 1, and the lower end of the cleaning shaft 21 is located inside the feed cylinder 1 and close to the discharge port. At least three cleaning blades 22 are fixedly connected to the cleaning shaft 21 at equal angles along the radial direction. Each cleaning blade 22 is spirally twisted. The outer edge of the cleaning blade 22 maintains a gap of 2 mm to 5 mm with the inner wall of the feed cylinder 1. One end of the drive linkage 23 is connected to the upper end of the cleaning shaft 21 through a universal joint, and the other end of the drive linkage 23 is connected to an external power source.

[0035] In the above technical solution, the vibration dispersion component 3 includes a vibration ring 31, a vibrator 32, and a connecting spring 33. The vibration ring 31 is sleeved on the middle section of the outer wall of the feed cylinder 1, and the vibration ring 31 and the feed cylinder 1 are connected by at least four connecting springs 33 evenly distributed along the circumference. The vibrator 32 is fixedly installed on the vibration ring 31, and the vibration direction of the vibrator 32 forms a 45-degree angle with the axial direction of the feed cylinder 1. The vibration generated by the vibrator 32 is transmitted to the feed cylinder 1 through the connecting spring 33.

[0036] Furthermore, in the above technical solution, the flow guiding and adjusting component 4 includes an adjusting valve plate, a valve plate rotating shaft, and an operating handle; the adjusting valve plate is located inside the discharge port, and the adjusting valve plate has a fan-shaped structure, with the chord length of the adjusting valve plate being equal to the diameter of the discharge port; the valve plate rotating shaft passes through the discharge port wall perpendicular to the axial direction of the feeding cylinder 1, with one end of the valve plate rotating shaft fixedly connected to the radial center position of the adjusting valve plate, and the other end of the valve plate rotating shaft extending to the outside of the feeding cylinder 1 and fixedly connected to the operating handle; the adjusting valve plate rotates around the valve plate rotating shaft to adjust the effective cross-sectional area of ​​the discharge port.

[0037] Furthermore, in the above technical solution, the support installation component 5 includes a base, columns, and connecting flanges; the base has a rectangular frame structure, and columns are fixedly extended upwards from the four corners of the base, with the columns made of Q235 carbon steel; the connecting flange is fixedly installed around the upper feed inlet of the feed cylinder 1, and the connecting flange is connected to the top of the column by bolts, with a through hole coaxial with the feed inlet on the connecting flange, the diameter of the through hole being 3 mm to 8 mm larger than the diameter of the feed inlet.

[0038] Furthermore, in the above technical solution, the inner wall surface of the feed cylinder 1 is provided with a spiral guide groove. The spiral direction of the spiral guide groove is the same as the spiral direction of the cleaning blade 22. The pitch of the spiral guide groove is twice the pitch of the cleaning blade 22. The depth of the spiral guide groove is 2 mm to 4 mm. The spiral guide groove is continuously distributed along the axial direction of the inner wall of the feed cylinder 1.

[0039] Furthermore, in the above technical solution, the surface of the cleaning shaft 21 is provided with a wear-resistant layer, which is made of tungsten carbide coating material with a coating thickness of 0.5 mm to 1.2 mm; the cleaning shaft 21 is provided with a tapered transition section at the lower end near the discharge port, the tapered transition section has a cone angle of 15 degrees to 25 degrees, and the tapered transition section is connected to the main body of the cleaning shaft 21 by an arc transition with a radius of 3 mm to 6 mm.

[0040] Furthermore, in the above technical solution, the outer wall surface of the feed cylinder 1 is provided with multiple reinforcing ribs, which extend along the axial direction of the feed cylinder 1, and the cross-section of the reinforcing ribs is T-shaped.

[0041] Furthermore, in the above technical solution, the edge of the cleaning blade 22 is serrated, the tooth tip angle is 30 degrees to 45 degrees, and the spacing between adjacent serrations is 8 mm to 12 mm.

[0042] Furthermore, in the above technical solution, the surface of the regulating valve plate is provided with a textured surface, the textured surface is arranged in a wave pattern, the wave height is 1 mm to 2 mm, and the wavelength is 5 mm to 8 mm.

[0043] Furthermore, in the above technical solution, the connecting spring 33 is a cylindrical helical spring with a wire diameter of 6 mm to 10 mm, a mean diameter of 40 mm to 60 mm, and an effective number of coils of 8 to 12.

[0044] The following is a specific embodiment 1 of this utility model: In the Raymond mill feeding system renovation project of a limestone grinding production line, the anti-clogging feeding structure of this utility model is used to replace the original simple funnel-type feeding device. The feeding cylinder 1 is made of high-quality carbon steel plate, with an upper inlet diameter of 400 mm, a lower outlet diameter of 200 mm, a cylinder height of 800 mm, a wall thickness of 8 mm, and an inner wall made of stainless steel plate welded for corrosion protection. The cleaning shaft 21 of the unblocking and cleaning component 2 is made of 45# steel solid shaft with a diameter of 50 mm, and the surface is sprayed with a tungsten carbide wear-resistant coating with a thickness of 1 mm. Four cleaning blades 22 are evenly distributed on the cleaning shaft 21. Each blade is 180 mm long, 60 mm wide, and 10 mm thick, with a spiral twist angle of 30 degrees. The blade material is wear-resistant steel plate, the edges are processed into a serrated shape, the tooth tip angle is 35 degrees, and the tooth spacing is 10 mm. The drive system uses a geared motor with a power of 2.2 kW and a reduction ratio of 1:30. It is connected to the cleaning shaft 21 via a universal coupling. The universal coupling adopts a cross-shaft structure and has a load capacity of 200 Nm. The vibration dispersion component 3 uses an electromagnetic vibrator 32 with an excitation force of 1000 N and a frequency of 50 Hz. The vibrating ring 31 is made of cast iron with an outer diameter of 600 mm, an inner diameter of 450 mm, and a thickness of 50 mm. It is connected to the feeding cylinder 1 via eight cylindrical helical springs with a wire diameter of 8 mm, a mean diameter of 50 mm, an effective number of turns of 10, and the spring material is 65Mn spring steel. The regulating valve plate of the flow guiding and regulating component 4 is made of stainless steel plate with a thickness of 6 mm, a fan radius of 100 mm, a central angle of 120 degrees, and a wavy texture on the surface with a wave height of 1.5 mm and a wavelength of 6 mm. The valve plate rotating shaft has a diameter of 25 mm and is made of stainless steel. Both ends are supported on the cylinder wall by bearings. The operating handle is 300 mm long for easy adjustment by the operator. The base of the support and mounting component 5 is made of welded steel structure, 1200 mm long, 800 mm wide, and 200 mm high. The column is made of seamless steel pipe with an outer diameter of 108 mm, a wall thickness of 6 mm, and a height of 1500 mm. The connecting flange is a standard flange with a nominal diameter of DN450 and a pressure rating of PN10. The inner wall of the feeding cylinder 1 is machined with spiral guide grooves, each 15 mm wide, 3 mm deep, and with a pitch of 400 mm. There are three grooves distributed at equal angles. After the entire set of equipment was installed and commissioned, the feeding system operated smoothly without any blockage when processing limestone raw materials with a moisture content of 3% to 5%. The material flow rate could be steadily adjusted within the range of 2 to 8 tons per hour. The equipment operating noise was less than 85 decibels, energy consumption was reduced by 15% compared to the original feeding system, and the maintenance interval was extended to once a month, which significantly improved production efficiency and equipment reliability.

[0045] The following is another specific embodiment 2 of this utility model: Embodiment 2 is an improved design based on Embodiment 1, specifically tailored to the special needs of processing highly viscous materials. Regarding the unblocking and cleaning component 2, the diameter of the cleaning shaft 21 is increased to 60 mm, and the surface wear-resistant coating adopts a ceramic particle-reinforced composite coating, with a thickness increased to 1.5 mm, providing stronger wear resistance and anti-adhesion. The number of cleaning blades 22 is increased to 6, the spiral twist angle of each blade is adjusted to 45 degrees, and the blade surface is treated with a special anti-adhesion coating to effectively prevent the adhesion of viscous materials. Regarding the vibration dispersion component 3, the excitation force of the vibrator 32 is increased to 1500 N, the frequency is adjusted to 60 Hz, the stiffness of the connecting spring 33 between the vibrating ring 31 and the feeding cylinder 1 is appropriately reduced, the spring wire diameter is changed to 6 mm, and the effective number of turns is increased to 12 turns, enabling the system to generate a larger amplitude vibration and enhancing the dispersion effect on viscous materials. The depth of the spiral guide groove on the inner wall of the feeding cylinder 1 is increased to 4 mm, and the bottom of the groove is machined into a V-shaped cross-section to enhance the guiding and shearing effect on viscous materials. In addition, a heating device is added to the outer wall of the feed cylinder 1, using an electric heating tape winding method with a power of 3 kilowatts. This device can control the cylinder temperature within the range of 40 to 60 degrees Celsius, effectively reducing the viscosity of viscous materials and further preventing blockage. This improved structure is particularly suitable for processing materials containing organic binders, powdery materials with high moisture content, and chemical raw materials with a certain degree of viscosity. It has demonstrated excellent anti-clogging performance in an application at an organic pigment production company.

[0046] The following is another specific embodiment 3 of this utility model: Embodiment 3 is an optimized design based on Embodiment 1, specifically addressing the special requirements of feeding ultrafine powder materials. Regarding the vibration dispersion component 3, the vibrator 32 employs dual-frequency vibration technology, simultaneously generating a low-frequency vibration of 25 Hz and a high-frequency vibration of 75 Hz. The low-frequency vibration promotes the flow of coarse particles, while the high-frequency vibration prevents the agglomeration of fine particles. The excitation force is adjusted to 800 Newtons to avoid excessive vibration causing the ultrafine powder to scatter. The connecting spring 33 adopts a variable stiffness design, with different elastic coefficients in the front and rear halves, making the vibration transmission characteristics more compatible with the flow requirements of ultrafine powder materials. Regarding the flow guiding and regulating component 4, the regulating valve plate adopts a multi-segment design, divided into a coarse adjustment segment and a fine adjustment segment. The coarse adjustment segment controls a large flow range, while the fine adjustment segment achieves precise adjustment of a small flow rate, meeting the stringent requirements of ultrafine powder materials for feeding accuracy. The raised texture on the valve plate surface has been replaced with a fine mesh texture, with a texture depth of only 0.5 mm and a mesh size of 2 mm by 2 mm. This not only disperses the powder but also prevents the accumulation of fine powder within the texture. An electrostatic eliminator is added to the inner wall of the feed cylinder 1, using an ion fan to generate positive and negative ions to neutralize the static charge on the surface of the ultrafine powder particles, preventing agglomeration and wall adhesion caused by electrostatic adsorption. A flexible sealing device is added to the cylinder outlet, using an adjustable sealing ring made of silicone rubber. This ensures a good seal while facilitating material passage, effectively preventing leakage and scattering of ultrafine powder.

[0047] Specifically, the principle of this utility model is as follows: This utility model uses the synergistic effect of multiple anti-clogging mechanisms to solve the clogging problem during the feeding process. First, the geometric shape of the truncated cone-shaped feeding cylinder utilizes gravity to naturally converge the material towards the discharge port, reducing the residence time and area of ​​the material within the cylinder. The spiral cleaning blades in the unblocking and cleaning component mechanically agitate and axially push the material within the cylinder through continuous rotation, disrupting the static state and agglomerated structure of the material, preventing its adhesion and accumulation on the inner wall of the cylinder. The spiral twisted shape of the cleaning blades generates a spiral propulsion force during rotation, forcing the material to move axially, while the serrated design of the blade edges enhances the ability to cut and break up adhering material. The vibration dispersion component, through the mechanical vibration generated by the vibrator, transmits it to the feeding cylinder via a connecting spring, causing the entire feeding system to generate high-frequency micro-amplitude vibration. This vibration effectively disrupts the electrostatic adsorption force and surface tension between material particles, preventing the aggregation and agglomeration of fine particles. The spiral guide grooves on the inner wall of the feeding cylinder work synergistically with the cleaning blades, guiding the material downward along the spiral trajectory, enhancing the material conveying capacity and dispersion effect. The flow control component precisely controls the effective cross-sectional area of ​​the discharge port by adjusting the rotation angle of the regulating valve plate, thereby regulating the material flow rate and velocity and preventing material accumulation and backflow at the discharge port. Through a clever combination of mechanical structures, the entire system achieves comprehensive control and optimization of the material flow process, eliminating the conditions and causes of blockages from multiple perspectives.

[0048] The specific operation or use method of this utility model is as follows: During equipment installation, firstly, fix the base of the support and installation assembly at an appropriate position above the feed inlet of the Raymond mill main unit, ensuring that the base is level and stable. Then, vertically install four columns at the four corners of the base, and fix the feed cylinder to the top of the columns through the connecting flange, ensuring that the axis of the feed cylinder coincides with the axis of the Raymond mill feed inlet. When installing the unblocking and cleaning assembly, insert the cleaning shaft from the upper end of the feed cylinder, so that the cleaning blade is located in a suitable position inside the cylinder, with a 2 to 5 mm gap between the outer edge of the cleaning blade and the inner wall of the cylinder. Connect the drive connecting rod to the upper end of the cleaning shaft through a universal joint, and connect the other end to an external power source such as a motor or hydraulic motor. When installing the vibration dispersion assembly, fit the vibration ring on the middle section of the outer wall of the feed cylinder, connect the vibration ring to the cylinder through a connecting spring, fix the vibrator on the vibration ring and adjust it to form a 45-degree angle with the axis of the cylinder. Before operating the equipment, first start the vibrator to vibrate the feeding cylinder, then start the cleaning shaft drive to rotate the cleaning blades. The speed is generally controlled at 30 to 60 revolutions per minute. Finally, start the material feeding system to begin normal feeding. During operation, the operator can adjust the valve opening according to the material flow. Rotating the operating handle clockwise reduces the discharge port area and decreases the flow rate, while rotating it counterclockwise increases the discharge port area and increases the flow rate. During routine maintenance, regularly check the gap between the cleaning blades and the inner wall of the cylinder, check the elasticity of the connecting springs, and check the tightness of all connections. If any abnormalities are found, adjust or replace the damaged parts promptly.

Claims

1. A Raymond mill front-end anti-clogging feeding structure, characterized in that, include: The system comprises a feeding cylinder, a cleaning and unblocking assembly, a vibration dispersion assembly, a flow guiding and adjusting assembly, and a support and mounting assembly. The feeding cylinder has a frustum-shaped conical structure, with an inlet at the upper end and an outlet at the lower end, the diameter of which is smaller than that of the inlet. The cleaning and unblocking assembly includes a cleaning shaft, cleaning blades, and a drive linkage. The cleaning shaft extends through the axial center of the feeding cylinder, with its upper end extending outside the cylinder and its lower end located inside the cylinder near the outlet. At least three cleaning blades are fixedly connected to the cleaning shaft at equal radial angles. Each cleaning blade is spirally twisted, and the outer edge of the blades maintains a gap of 2 mm to 5 mm with the inner wall of the feeding cylinder. One end of the drive linkage is connected to the upper end of the cleaning shaft via a universal joint, and the other end is connected to an external power source.

2. The anti-clogging feeding structure at the front end of a Raymond mill according to claim 1, characterized in that, The vibration dispersion assembly includes a vibrating ring, an exciter, and connecting springs. The vibrating ring is sleeved on the middle section of the outer wall of the feeding cylinder, and the vibrating ring and the feeding cylinder are connected by at least four connecting springs evenly distributed along the circumference. The exciter is fixedly installed on the vibrating ring, and the vibration direction of the exciter is at a 45-degree angle to the axial direction of the feeding cylinder. The vibration generated by the exciter is transmitted to the feeding cylinder through the connecting springs.

3. The anti-clogging feeding structure at the front end of a Raymond mill according to claim 2, characterized in that, The flow guiding and adjusting assembly includes an adjusting valve plate, a valve plate shaft, and an operating handle. The adjusting valve plate is located inside the discharge port and has a fan-shaped structure. The length of the chord side of the adjusting valve plate is equal to the diameter of the discharge port. The valve plate shaft passes through the discharge port wall perpendicular to the axial direction of the feeding cylinder. One end of the valve plate shaft is fixedly connected to the radial center position of the adjusting valve plate, and the other end of the valve plate shaft extends to the outside of the feeding cylinder and is fixedly connected to the operating handle. The adjusting valve plate rotates around the valve plate shaft to adjust the effective cross-sectional area of ​​the discharge port.

4. The anti-clogging feeding structure at the front end of a Raymond mill according to claim 3, characterized in that, The support and installation assembly includes a base, columns, and connecting flanges. The base has a rectangular frame structure, and columns are fixedly extended upwards from the four corners of the base. The columns are made of Q235 carbon steel. The connecting flange is fixedly installed around the upper feed inlet of the feed cylinder. The connecting flange is connected to the top of the column by bolts. The connecting flange has a through hole coaxial with the feed inlet, and the diameter of the through hole is 3 mm to 8 mm larger than the diameter of the feed inlet.

5. The anti-clogging feeding structure at the front end of a Raymond mill according to claim 4, characterized in that, The inner wall of the feeding cylinder is provided with a spiral guide groove. The spiral direction of the spiral guide groove is the same as that of the cleaning blade. The pitch of the spiral guide groove is twice that of the cleaning blade. The depth of the spiral guide groove is 2 mm to 4 mm. The spiral guide groove is continuously distributed along the axial direction of the inner wall of the feeding cylinder.

6. The anti-clogging feeding structure at the front end of a Raymond mill according to claim 5, characterized in that, The surface of the cleaning shaft is provided with a wear-resistant layer, which is made of tungsten carbide coating material with a coating thickness of 0.5 mm to 1.2 mm. The cleaning shaft has a tapered transition section at the lower end near the discharge port. The tapered transition section has a cone angle of 15 degrees to 25 degrees. The tapered transition section is connected to the main body of the cleaning shaft by an arc transition with a radius of 3 mm to 6 mm.

7. The anti-clogging feeding structure at the front end of a Raymond mill according to claim 6, characterized in that, The outer wall of the feeding cylinder is provided with multiple reinforcing ribs, which extend along the axial direction of the feeding cylinder and have a T-shaped cross-section.

8. The anti-clogging feeding structure at the front end of a Raymond mill according to claim 7, characterized in that, The cleaning blade has a serrated edge with a tooth tip angle of 30 to 45 degrees and a spacing of 8 to 12 millimeters between adjacent teeth.

9. The anti-clogging feeding structure at the front end of a Raymond mill according to claim 8, characterized in that, The surface of the regulating valve plate is provided with a textured surface, which is arranged in a wave pattern. The wave height is 1 mm to 2 mm and the wavelength is 5 mm to 8 mm.

10. The anti-clogging feeding structure at the front end of a Raymond mill according to claim 9, characterized in that, The connecting spring is a cylindrical helical spring with a wire diameter of 6 mm to 10 mm, a mean diameter of 40 mm to 60 mm, and an effective number of coils of 8 to 12.

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