A continuous operation double function sand grinder with drum and central stirring

Abstract

This invention relates to a grinding mill, and more particularly to a continuous-operation drum-type dual-function grinding mill with central stirring, comprising a feeding device, a drum, sand-lifting plates, a central stirring shaft, impellers, a stirring shaft drive device, a drum tilt angle adjustment device, a drum drive device, a discharge device, a grinding media separation screen, and a grinding media return device. The feeding device feeds sand and grinding media into the drum. Sand-lifting plates are installed on the inner wall of the drum. A central stirring shaft with impellers is located at the center of the drum. The drum and the central stirring shaft are driven by their respective drive devices to rotate in opposite directions. As the sand falls downwards, it is pushed upwards towards the feed inlet by the impellers. The drum tilt angle adjustment device adjusts the tilt angle, allowing the sand and grinding media to flow out of the discharge outlet by gravity. The grinding media separation screen separates the sand from the grinding media, and the grinding media is returned to the feed inlet for recycling. This grinding mill is an innovative and essential production equipment for ensuring the roundness and quality of high-quality machine-made sand, filling a technological gap both domestically and internationally.

Description

Technical Field

[0001] This invention relates to a sand and gravel production equipment for the construction industry, and more particularly to a continuous operation drum-type and center-mixing dual-function sander. Background Technology

[0002] Compared with existing standardized products:

[0003] Ball mills, rod mills, and grinding mills used in the market are all standardized products, key equipment for further pulverizing materials after they have been crushed. They are widely used in industries such as cement, silicate products, new building materials, refractory materials, fertilizers, ferrous and non-ferrous metal ore beneficiation, and glass and ceramics production for dry or wet grinding of various ores and other grindable materials. Ball mills are suitable for grinding various ores and other materials and are widely used in mineral processing, building materials, and chemical industries. They can be divided into dry and wet grinding methods. However, when used for polishing and removing sharp edges of manufactured sand, this device has the following disadvantages:

[0004] 1) It cannot be operated on an assembly line because its enclosed structure requires the grinding media to be sealed in the drum, and grinding needs to be done bucket by bucket, which cannot be done on an assembly line.

[0005] 2) The rotation speed and tilt angle are not adjustable. The hardness and gradation of the manufactured sand produced by the same sand making plant are different. For sand with different hardness and gradation, the grinding time and speed required to remove the sharp edges are different. Traditional ball mills cannot meet the needs of grinding manufactured sand. Summary of the Invention

[0006] This invention addresses the issue that existing sand-making machines produce sand with needle-like, flaky, and angular particles that fail to meet the quality requirements for high-quality manufactured sand morphology. To address this, we have developed a novel continuous-operation drum-type dual-function grinding mill with central mixing, achieving a breakthrough in the technical challenge of grinding and shaping manufactured sand particles nationwide. This grinding mill features a scientific design, simple structure, quick installation, and convenient relocation, and can meet the needs for producing high-quality manufactured sand for C50 and higher concrete strength grades. The high-quality manufactured sand meets standard requirements for sphericity, improves concrete fluidity, and enhances the stability of concrete strength.

[0007] The sand particle shaping of this invention lays the foundation for high-quality manufactured sand, solves the market demand for construction sand due to the severe shortage of natural sand caused by environmental protection restrictions, and addresses the technical problem of producing C50 and above concrete with high-quality manufactured sand. It realizes the replacement of natural sand with manufactured sand, and this scientific research achievement fills the technical gap in the international and domestic construction industry.

[0008] This invention is achieved through the following technical solution:

[0009] The continuous operation drum-type dual-function grinding mill with central stirring includes a feeding device, a drum, a drum drive device, grinding media, sand-lifting plates, a drum tilt adjustment device, a central stirring shaft, blades, a stirring shaft drive device, a discharge device, a grinding media separation screen, and a grinding media return device. The feeding device feeds sand and grinding media into the drum. Sand-lifting plates are installed on the inner wall of the drum. A central stirring shaft with blades is located at the center of the drum. The drum and the central stirring shaft are driven by their respective drive devices to rotate in opposite directions. The sand is pushed upwards towards the feed inlet by the blades as it falls downwards. The drum tilt adjustment device adjusts the tilt angle to control the flow rate of sand and grinding media out of the discharge outlet, ensuring consistency with the grinding quality. The grinding media separation screen at the discharge outlet separates the sand from the grinding media, and the grinding media is returned to the feed inlet for recycling. Its significant technical feature is that it breaks away from the traditional intermittent batch production, achieving continuous production with a high-in, low-out drum, and the agitation of the central stirring shaft blades greatly improves production efficiency.

[0010] The continuous operation drum-type and center-stirring dual-function sander is characterized by a circular drum. The drum diameter and length are determined according to different rock types, centrifugal speed, output, and roundness to meet the requirements of sander output and the roundness of manufactured sand.

[0011] The continuous operation drum-type and center-stirring dual-function sander is characterized in that the drum drive device adopts gear and gear ring drive in the middle of the drum span, and sets an array of support rollers on the left and right sides of the drive device to ensure the gear meshing clearance and control the concentricity of the drum.

[0012] The roller drive device is characterized by adjustable roller speed to adjust the balance between output and roundness, adapting to different rock types.

[0013] The continuous operation drum-type and center-stirring dual-function sander is characterized in that the sander drum passes through... roller Tilt adjustment device By adjusting the tilt angle, the sand moves downwards as the drum rotates and the sand falls, achieving continuous operation of sand entering from the high end and exiting from the low end, while balancing the constraints between sand production output and grinding quality.

[0014] The roller is characterized by having sand-lifting plates arranged in a triangular pattern on its inner wall. These plates lift the sand and grinding media inside the roller to a certain height before dropping them. Through repeated lifting and dropping, the impact and friction generated can eliminate the sharp edges of the manufactured sand, achieving the required roundness and thus ensuring the fluidity and strength of the concrete.

[0015] The continuous-operation drum-type dual-function grinding mill with central stirring is characterized by a central stirring shaft installed inside the grinding mill drum. The central stirring shaft is supported by bearings at both ends and consists of three sections of steel pipes with different diameters. An array of blades is mounted on the shaft. The blade surfaces are coated with a mixture of a strong, wear-resistant adhesive and high-strength micro-particles (polyurethane / epoxy resin bonded corundum) that creates a frictional effect. During stirring, the composite material on the blades rubs against the manufactured sand, polishing sharp edges, increasing grinding efficiency, and shortening grinding time. Depending on the output and desired roundness, the angle of the blades can be adjusted, i.e., the speed at which the blades push towards the feed end can be adjusted, increasing the friction time of the manufactured sand. The grinding effect is further enhanced by the tumbling friction of the blades.

[0016] The continuous operation drum-type and central stirring dual-function sander is characterized by a stirring shaft drive device that is driven at the high end of the sander. The motor and reducer are connected by a belt, and the reducer is directly connected to the central stirring shaft. The speed of the central stirring shaft is adjustable through the variable frequency motor and reducer. The belt drive has an overload function. The central stirring shaft rotates in the opposite direction to the sander drum, which causes the sand to move relative to each other inside the drum, producing sand-on-sand, eliminating needle-like and flaky particles, improving the sanding effect, and shortening the grinding time.

[0017] The continuous operation drum-type and center-stirring dual-function sander is characterized in that the feed inlet is located at the center of the high end panel of the sander drum, the discharge outlet is located on the periphery of the low end panel of the sander drum and is evenly distributed, and a discharge speed adjustment plate is provided, and an environmentally friendly dust removal hood is provided at the discharge device.

[0018] The continuous operation drum-type and center-stirring dual-function sander is characterized by the addition of grinding media inside the sander drum. At the discharge port, the grinding media is screened out by the grinding media separation screen and continuously returned to the feed hopper, maintaining a constant proportion of grinding media inside the sander drum. The sand passes through the grinding media separation screen and enters the next process, achieving continuous production.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a front view of the grinding machine described in this invention;

[0021] Figure 2 This is a side sectional view of the grinding machine drum described in this invention;

[0022] Figure 3 This is an isometric side sectional view of the grinding machine drum described in this invention;

[0023] Figure 4 This is a partially enlarged view of the sand-lifting plate of the grinding machine described in this invention;

[0024] in:

[0025] 1. Feeding device; 1-1 Feeding funnel, 1-2 Feeding guide tube.

[0026] 2. Roller; 2-1 Inlet, 2-2 Support ring, 2-3 Outlet.

[0027] 2-4 Discharge port baffle, 2-5 Sand lifting plate.

[0028] 3. Drum drive unit; 3-1 Variable speed motor, 3-2 Reducer,

[0029] 3-3 gear, 3-4 gear ring.

[0030] 4. Roller tilt adjustment device; 4-1 hinge support, 4-2 height adjustment bolt, 4-3 foundation base.

[0031] 5. Discharge device; 5-1 Dust collector hood, 5-2 Grinding media separator sieve, 5-3 Discharge funnel,

[0032] 5-4 High-pressure dust exhaust port

[0033] 6. Grinding media return device;

[0034] 7. Stirring shaft drive unit; 7-1 Variable speed motor, 7-2 Transmission belt, 7-3 Reducer,

[0035] 7-4 coupling.

[0036] 8. Central mixing system; 8-1 Central mixing shaft, 8-2 Bearing housing, 8-3 Impeller,

[0037] 8-4 Blade Angle Adjustment Bolt.

[0038] 9. Grinding media; 9-1 ceramic grinding balls.

[0039] 10. Support device: 10-1 support wheel, 10-2 support base.

[0040] 11. Steel supports at both ends of the drum: 11-1 Central stirring shaft support, 11-2 Feed funnel support,

[0041] 11-3 Dust cover bracket;

[0042] 12. Steel base for the grinding machine;

[0043] 13. Foundation of the sander; Detailed Implementation

[0044] like Figure 1As shown in this embodiment, a continuous operation drum-type dual-function grinding mill with central stirring includes a feeding device 1, a feeding hopper 1-1, a guide tube 1-2, a drum 2, a feeding inlet 2-1, a support ring 2-2, a discharge outlet 2-3, a discharge outlet baffle 2-4, a sand-lifting plate 2-5, a drum drive device 3, a variable speed motor 3-1, a reducer 3-2, a gear 3-3, a gear ring 3-4, a drum tilt adjustment device 4, a hinge support 4-1, a height adjustment bolt 4-2, a foundation base 4-3, a discharge device 5, a dust collector 5-1, a grinding media separation screen 5-2, a discharge hopper 5-3, and a dust collector. 5-4. Pressure air inlet, 6. Grinding media return device, 7. Stirring shaft drive device; 7-1. Variable speed motor, 7-2. Transmission belt, 7-3. Reducer, 7-4. Coupling, 8. Central stirring system, 8-1. Central stirring shaft, 8-2. Bearing seat, 8-3. Blade, 8-4. Blade angle adjustment bolt, 9. Grinding media, 9-1. Ceramic grinding ball, 10. Support device, 10-1. Support wheel, 10-2. Support base, 11. Steel brackets at both ends of the drum, 11-1. Central stirring shaft bracket, 11-2. Feed funnel bracket, 11-3. Dust cover bracket, 12. Steel base of the grinding machine, 13. Foundation of the grinding machine.

[0045] The feeding device 1 described in this embodiment feeds sand and grinding media 9 into the drum 2 through the feeding funnel 1-1 and the dredging pipe 1-2. The inner wall of the drum 2 is provided with sand lifting plates 2-5. A central stirring shaft system 8 is set in the center of the drum 2. The blades 8-3 are installed on the central stirring shaft 8-1 through blade angle adjusting bolts 8-4. The two ends of the central stirring shaft 8-1 are positioned and supported by bearing seats 8-2.

[0046] In this embodiment, the roller 2 is driven by the roller drive device 3, wherein the variable speed motor 3-1 is directly connected to the reducer 3-2. The variable speed motor 3-1 drives the gear 3-3 and the gear ring 3-4 to rotate through the reducer 3-2, thereby driving the roller 2 to rotate. The transmission sequence is: variable speed motor 3-1 → reducer 3-2 → gear 3-3 → gear ring 3-4 → roller 2.

[0047] In this embodiment, the central stirring shaft 8-1 is driven by a stirring shaft drive device 7, wherein the variable speed motor 7-1 and the reducer 7-3 are connected by a transmission belt 7-2, and the reducer 7-3 is connected to the central stirring shaft 8-1 by a coupling 7-4. The transmission sequence is: variable speed motor 7-1 → transmission belt 7-2 → reducer 7-3 → coupling 7-4 → central stirring shaft 8-1.

[0048] In this embodiment, the rotation direction of the drum 2 is opposite to that of the central stirring shaft 8-1. As the sand falls downwards, it is pushed towards the upper end of the drum 2 by the blades 8-3, increasing the length of the sand's trajectory within the drum 2 and thus increasing the frequency and duration of friction. The drum tilt adjustment device 4 adjusts the length of the height adjustment bolt 4-2, thereby adjusting the height of the hinge support 4-1 and controlling the relationship between the output and quality of the grinding. The discharge speed of the sand and grinding media 9 is controlled by adjusting the tilt angle, ensuring that the speed at which the sand and grinding media 9 flow out of the discharge port 2-3 is consistent with the grinding quality. Through the discharge port 2-3, the sand and grinding media 9 fall into the discharge device 5. The grinding media separation screen 5-2 separates the sand and grinding media 9. The grinding media 9 returns to the feed port 2-1 for recycling via the grinding media return device 6, while the sand enters the next process through the discharge funnel 5-3.

[0049] This grinding machine meets the roundness quality requirements of manufactured sand. Its significant technical feature is that it breaks away from the traditional batch-by-batch intermittent production and achieves continuous production with high-inlet and low-outlet drums. Furthermore, the agitation of the central stirring shaft blades greatly improves production efficiency, providing a guarantee for the production of high-quality manufactured sand on the assembly line.

[0050] The continuous operation drum-type and center-stirring dual-function sander described in this embodiment is characterized by the drum 2 being cylindrical. The diameter and length of the drum 2 are determined according to different rock types, centrifugal speed, output, and roundness to meet the requirements of the sander's output and the roundness of the manufactured sand.

[0051] The continuous operation drum-type dual-function grinding machine with central stirring described in this embodiment uses a gear 3-3 and a gear ring 3-4 to drive the drum 2 in the middle. Four sets of support devices 10 are arranged on the left and right sides of the drum drive device 3. Each support device 10 consists of a support wheel 10-1 and a support base 10-2. The support wheel 10-1 is supported by the support base 10-2 and rests on the support ring 2-2 on the drum 2, ensuring that the gear meshing clearance does not exceed 0.4mm and controlling the concentricity of the drum 2 within ±0.15mm. The grinding drum 2 is driven by the drum drive device 3. The variable speed motor 3-1 drives the drive gear 3-3 through the reducer 3-2, which in turn drives the drive gear ring 3-4 to rotate the grinding drum 2. The motor in the drum drive device 3 is a variable speed motor, allowing for speed adjustment.

[0052] The drum drive device 3 described in this embodiment is characterized by adjustable drum 2 rotation speed to adjust the balance between output and roundness, adapting to different rock types, such as... Figure 1As shown, the roller drive device 3 of the grinding mill roller 2 can adjust the rotation speed of the grinding mill roller to 10-60 r / min, and the roller tilt angle adjustment device 4 can adjust the tilt angle to 0°-8°. This allows for the design and adjustment of reasonable roller diameter and length to suit different rock types, meeting the grinding mill's output of 60 t / h. The edges and corners of the manufactured sand particles are ground down, and needle-like and flaky particles are crushed, satisfying the fluidity and strength requirements of C50 and above concrete for manufactured sand quality.

[0053] The continuous operation drum-type and center-stirring dual-function sander described in this embodiment is characterized in that the sander drum 2 is tilted by the drum tilt angle adjustment device 4, and the sand moves downward during the rotation of the drum 2 and the falling of the sand, so as to realize continuous operation of sand entering from the high end and exiting from the low end. The grinding mill roller 2 has a high feed end and a low discharge end, forming an inclined angle. The inclination angle of the grinding mill roller 2 is adjusted by the roller inclination angle adjustment device 4. The bolts in the roller inclination angle adjustment device 4 are double-threaded bolts with double nuts to prevent loosening. The inclination angle can be adjusted within the range of 0° to 10° according to the actual situation. The grinding mill feed inlet 2-1 is located at the center of the high end panel of the grinding mill roller 2, and the discharge outlet 2-3 is located at the edge of the low end panel of the grinding mill roller 2. It is fan-shaped and has a circumferential grid design, generally dividing the circumference into 18 equal parts, with a total of 9 discharge outlets. The dimensions of the discharge outlets are 400mm long × 520mm wide, and there is a discharge outlet baffle 2-4 to adjust the size of the discharge outlets 2-3 to control the discharge speed. Through continuous feeding and discharging, the grinding mill can achieve assembly line operation and continuous production.

[0054] like Figure 2 As shown in the figure, the roller 2 described in this embodiment is characterized by having sand-lifting plates 2-5 on its inner wall. These plates are T-shaped, with a sand-lifting working surface of 200×170×10mm and a fixed surface of 200×200×10mm, arranged in a continuous longitudinal triangular pattern. The circumference is divided into 15 equal parts, and the plates are fixed to the roller wall by 4 bolts. The sand and grinding media 9 inside the roller 2 are lifted to a certain height and then dropped. Through repeated lifting and dropping, the impact and friction generated can eliminate the sharp edges of the manufactured sand, achieving the required roundness.

[0055] like Figure 3As shown in this embodiment, the continuous operation drum-type dual-function grinding mill with central stirring has a central stirring shaft 8-1 inside the grinding mill drum 2. The central stirring shaft 8-1 is supported at both ends by bearing seats 8-2 and consists of three sections of steel pipes with different diameters: the middle section is thicker, and the two end sections are thinner, connected by flanges. The central stirring shaft 8-1 has 21 sets of three-blade paddles 8-3, each set divided into 120° sections. The surface of the paddles 8-3 is coated with a strong and wear-resistant composite material to increase friction. The composite material consists of polyurethane or epoxy resin bonded with corundum. During stirring, the composite material on the paddles 8-3 rubs against the manufactured sand, polishing the edges and increasing grinding efficiency and shortening grinding time. Depending on the output and roundness, the angle of the paddles 8-3 can be adjusted using the paddle angle adjusting bolts 8-4, thus adjusting the speed at which the paddles 8-3 push the manufactured sand towards the feed end, increasing the friction time of the manufactured sand, and improving the grinding effect due to the tumbling friction of the paddles.

[0056] like Figure 3 As shown in the embodiment, the continuous operation drum-type and central stirring dual-function sander is characterized by the stirring shaft drive device 7 being driven at the high end, the variable speed motor 7-1 and the reducer 7-3 being connected by a transmission belt 7-2, the reducer 7-3 being directly connected to the central stirring shaft 8-1 through a coupling 7-4, the central stirring shaft 8-1 having an adjustable speed, the belt drive having an overload function, and the central stirring shaft 8-1 rotating in the opposite direction to the sander drum 2, causing the sand to move relative to each other inside the drum, increasing grinding efficiency and shortening grinding time.

[0057] The continuous operation drum-type and center-stirring dual-function sander described in this embodiment is characterized in that the feeding device consists of a feeding funnel 1-1 and a diversion pipe 1-2. The sand flows through the feeding funnel 1-1 and the diversion pipe 1-2. The diversion pipe 1-2 extends into the feeding port 2-1 on the drum 2, so that the sand enters the drum.

[0058] The continuous operation drum-type and center-stirring dual-function sander described in this embodiment is characterized by an environmentally friendly dust removal hood 5-1 at the discharge device 5, and a high-pressure dust exhaust port 5-4 above the dust removal hood 5-1, which can remove and collect the dust generated during the operation of the sander.

[0059] The continuous operation drum-type and center-stirring dual-function sander described in this embodiment is characterized by the inclusion of grinding media 9—ceramic grinding balls 9-1—into the sander drum 2, with a volume of 30% of the manufactured sand. A sand-lifting plate 2-5 on the inner wall of the drum lifts the sand and grinding balls to an appropriate height within the drum 2. Through mutual impact and grinding during free fall, the sharp edges and flaky textures of the manufactured sand are eliminated. The ceramic grinding balls 9-1 and the manufactured sand are simultaneously discharged from the discharge port 2-3. After passing through the discharge device 5, the ceramic grinding balls 9-1 are screened by the grinding media separation screen 5-2, a 30° inclined screen. The grinding balls are rolled to the grinding media return device 6 and continuously returned to the feed funnel 1-1, maintaining the occupancy rate of the ceramic grinding balls 9-1 within the sander drum 2. The manufactured sand, passing through the grinding media separation screen 5-2, is then conveyed through the discharge funnel 5-3 to the next process, achieving continuous production.

[0060] The continuous operation drum-type and central stirring dual-function sander described in this embodiment is characterized by steel supports 11 at both ends of the drum, with the feed funnel support 11-2 in the steel supports 11 at both ends of the drum installed at the feed inlet 2-1 of the sander, wherein the stirring shaft drive device 7 is placed on the steel supports 11 at both ends of the drum near the feed inlet 2-1, the central stirring shaft support 11-1 is placed on the steel supports 11 at both ends of the drum, and the dust cover support 11-3 is placed at the discharge outlet of the steel supports 11 at both ends of the drum.

[0061] The entire grinding machine is placed on the steel base 12 of the grinding machine. The steel base 12 of the grinding machine is installed on the foundation base 4-3 by adjusting bolts of hinge support 4-1 and 4-2. The foundation base 4-3 is placed on the foundation 13 of the grinding machine.

[0062] This grinding machine is the first to solve the problem of particle morphology in manufactured sand, ensuring that the roundness meets the standard requirements for manufactured sand. This is a pioneering achievement in the sand and gravel industry, filling a technological gap both internationally and domestically. It possesses the innovativeness of an invention patent.

Claims

1. A continuous operation drum-type dual-function grinding mill with central stirring, comprising a feeding device, a drum, a drum drive device, grinding media, sand-lifting plates, a drum tilt angle adjustment device, a central stirring shaft, blades, a stirring shaft drive device, a discharge device, a grinding media separation screen, and a grinding media return device. The feeding device feeds sand and grinding media into the drum. The inner wall of the drum is equipped with sand-lifting plates. A central stirring shaft with blades is located at the center of the drum. The drum and the central stirring shaft are driven by their respective drive devices to rotate in opposite directions. The sand is pushed towards the upper feed port by the blades as it falls downwards. The drum tilt angle adjustment device adjusts the tilt angle to control the flow rate of sand and grinding media out of the discharge port to be consistent with the grinding quality. The grinding media separation screen at the discharge port separates the sand from the grinding media, and the grinding media is returned to the feed port for recycling. Its significant technical feature is that it breaks the traditional intermittent production of batches and realizes continuous production with high inlet and low outlet of the drum. Moreover, the stirring of the blades on the central stirring shaft greatly improves the production efficiency.

2. The continuous operation drum-type and central stirring dual-function grinding machine as described in claim 1, characterized in that: The drum is cylindrical, and its diameter and length are determined according to different rock types, centrifugal speed, output, and roundness requirements to meet the requirements of the grinding machine's output and the roundness of the manufactured sand.

3. The continuous operation drum-type and central stirring dual-function grinding machine as described in claim 1, characterized in that: The roller drive device uses gears and gear rings to drive the rollers in the middle of the roller span. A set of support rollers are set on the left and right sides of the drive device to ensure the gear meshing clearance and control the concentricity of the rollers.

4. The roller drive device as described in claim 3, characterized in that: The drum speed is adjustable to balance output and roundness, adapting to different rock types.

5. The continuous operation drum-type and central stirring dual-function grinding machine as described in claim 1, characterized in that: The grinding machine roller passes through Roller tilt adjustment device By adjusting the tilt angle, the sand moves downwards as the drum rotates and the sand falls, achieving continuous operation of sand entering from the high end and exiting from the low end, while balancing the constraints between sand production output and grinding quality.

6. The roller as described in claim 2, characterized in that... The inner wall of the drum is equipped with sand-lifting plates arranged in a triangular pattern. These plates lift the sand and grinding media inside the drum to a certain height before dropping them. Through repeated lifting and dropping, the impact and friction generated can eliminate the sharp edges of the manufactured sand, achieving the required roundness and thus ensuring the fluidity and strength of the concrete.

7. The continuous operation drum-type and central stirring dual-function grinding machine as described in claim 1, characterized in that: The grinding mill drum is equipped with a central stirring shaft, supported by bearings at both ends. The central stirring shaft consists of three sections of steel pipes with different diameters, and has a series of blades. The blades are coated with a mixture of a strong adhesive and wear-resistant adhesive and high-strength micro-particles (polyurethane / epoxy resin bonded corundum) to create a frictional effect. While stirring, the composite material on the blades rubs against the manufactured sand, polishing the edges and corners, increasing grinding efficiency, and shortening grinding time. Depending on the output and the desired roundness, the angle of the blades is adjusted, which adjusts the speed at which the blades push towards the feed end, increasing the friction time of the manufactured sand. The grinding effect is improved due to the tumbling friction of the blades.

8. The continuous operation drum-type and central stirring dual-function grinding machine as described in claim 1, characterized in that: The stirring shaft drive is located at the high end of the grinding machine. The motor and reducer are connected by a belt, and the reducer is directly connected to the central stirring shaft. The speed of the central stirring shaft is adjustable through the variable frequency motor and reducer. The belt drive has an overload function. The central stirring shaft rotates in the opposite direction to the grinding machine drum, so that the sand moves relative to each other inside the drum, producing sand-on-sand, eliminating needle-like and flaky particles, improving the grinding effect, and shortening the grinding time.

9. The continuous operation drum-type and central stirring dual-function grinding machine as described in claim 1, characterized in that: The feed inlet is located on the grinding mill drum. High-end panel At the center, the discharge port is located around the lower end panel of the grinding machine drum and is evenly distributed. It is also equipped with a discharge speed adjustment plate and an environmental dust removal hood at the discharge device.

10. The continuous operation drum-type and central stirring dual-function grinding machine as described in claim 1, characterized in that... Grinding media are added into the grinding mill drum. At the discharge port, the grinding media are screened out by the grinding media separation screen and continuously returned to the feed funnel, keeping the proportion of grinding media in the grinding mill drum constant. The sand passes through the grinding media separation screen and enters the next process, realizing continuous production.

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