Vertical spiral self-deviation-correcting stirring mill device

Abstract

A vertical spiral self-deviation-rectifying stirred mill device belongs to the technical field of ore grinding equipment and comprises a driving motor, a tilting pad self-deviation-rectifying system, a free end vibration reduction and deviation prevention system, a stirring system, a supporting system and a circulation system. The tilting pad self-correcting system is mounted at the top of the barrel, it is ensured that a convergent wedge-shaped gap is automatically formed between the tilting pad and the stirring shaft in the rotating process of the stirring shaft, wedge-shaped oil film pressure generated in the stirring shaft forces the stirring shaft to return to the initial position, the spiral oil return line is formed in the inner surface of the tilting pad seat, and the stability of the wedge-shaped oil film can be ensured; automatic deviation correction of the stirring shaft is realized; by designing the vibration reduction and deviation prevention system at the free end, vibration reduction and deviation prevention of deflection of the free end of the main shaft can be achieved through the buffer bush and the positioning rod in the vibration reduction and deviation prevention system. Through coordination and cooperation of the tilting pad self-correction system and the free end vibration reduction and deviation prevention system, centering of the free end of the stirring shaft can be guaranteed, vibration transmitted to the upper end of the stirring shaft can be automatically buffered and adjusted, deflection is prevented from being intensified, and positioning self-correction of the stirring shaft in the vertical direction is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding equipment, and in particular relates to a vertical spiral self-correcting stirring mill device. Background Art

[0002] The vertical spiral stirred mill is an ultrafine grinding equipment, usually composed of a frame, a drive device, a cylinder, a spiral stirrer, etc. The spiral stirrer blades are driven by a motor or other drive device to rotate, driving the grinding media and slurry inside the cylinder to perform multi-dimensional circulation and self-rotation. The equipment focuses on the efficient resource utilization of fine-grained and difficult-to-handle metal ores and tailings from ore dressing plants, providing technical support for solving the waste of resources and environmental pollution in traditional mining development.

[0003] The upper end of the stirring shaft of the existing vertical spiral stirring mill is connected to the motor, the cylinder and other devices through a coupling, and the end near the bottom of the cylinder is a free end. Since its supporting device is far away from the free end, the stirring shaft is similar to a cantilever beam in this case. During normal operation, the free end is prone to yaw motion. Under the influence of the grinding medium and slurry inside the cylinder, the yaw amount will further increase, and even the top of the stirring shaft will break or the connecting bearing will be dislocated, thereby causing the mill to shut down and affect production operations. Especially before the start-up stage, a large amount of slurry is input through the feed port near the bottom of the cylinder, and the subsequent grinding medium sinks to the bottom. The impact and friction of the slurry and the grinding medium can easily destroy the centering of the stirring shaft; in addition, since the grinding operation is continuous, after the stirring shaft enters a stable state, the slurry will continuously be input to the bottom of the cylinder through the feed port. Each time the slurry is input, it will inevitably cause impact and friction on the free end of the stirring shaft. This load that forces the free end of the stirring shaft to yaw will be further transmitted to the top of the stirring shaft, thereby aggravating the yaw motion of the entire stirring shaft and even destroying normal production operations.

[0004] To address this problem, it is necessary to design a vertical spiral self-correcting stirring mill device, which can not only ensure the centering and buffering vibration reduction capabilities of the free end of the stirring shaft, but also automatically buffer and adjust the vibration transmitted to the upper end of the stirring shaft to prevent the aggravation of the deflection. Summary of the invention

[0005] The present invention provides a vertical spiral self-correcting stirring mill device. A tilting pad self-correcting system is installed on the top of a cylinder body to ensure that a converging wedge-shaped gap is automatically formed between the tilting pad and the stirring shaft during the rotation of the stirring shaft. The wedge-shaped oil film pressure generated inside the tilting pad forces the stirring shaft to return to an initial position. A spiral oil return line is opened on the inner surface of the pad seat to ensure the stability of the wedge-shaped oil film and realize automatic correction of the stirring shaft. A vibration reduction and anti-deflection system is arranged at the free end. The buffer bushing and positioning rod inside the device can realize vibration reduction and anti-deflection of the free end of the main shaft.

[0006] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0007] A vertical spiral self-correcting stirring mill device includes a driving motor, a tilting pad self-correcting system, a free end vibration reduction and anti-deflection system, a stirring system, a support system, and a circulation system. The tilting pad self-correcting system includes a tilting pad, a lower end cover, a pad seat, a spiral oil return line, an upper end cover, an O-ring, an oil inlet, an oil outlet, a swing pivot, and a bolt; the free end vibration reduction and anti-deflection system includes a positioning rod, a T-shaped sealing cover plate, a buffer bushing, and a wear-resistant sealing ring; the stirring system includes a stirring shaft and propeller blades; the support system includes a cylinder, a liner, and a support frame; and the circulation system includes a grinding medium input port, a feed port, a discharge port, and a grinding door.

[0008] Furthermore, the lower end cover and the upper end cover of the tilting pad self-correcting system are each provided with six circular through holes evenly distributed around the circumference, the outer surface of the boss of the lower end cover is processed with external threads, and the upper end surface of the boss is processed with three internal thread holes evenly distributed around the circumference, the lower end surface of the boss is in contact with the top surface of the cylinder and is connected by bolts, the upper end cover is connected to the top surface of the support frame by bolts, and the central circular through holes of the lower end cover and the upper end cover are both matched with the clearance of the stirring shaft and are sealed by an O-ring.

[0009] Furthermore, the tile seat is in a circular shape, and the bottom of its inner wall surface is processed with an internal thread that can match with the thread on the outer surface of the lower end cover boss. The bottom of the inner wall of the tile seat and the outer surface of the lower end cover boss are connected by threads, and the upper end surface of the tile seat and the lower surface of the upper end cover are sealed by gluing to ensure a good sealing effect. The bottom of the swing pivot rod is processed with an external thread that matches with the internal thread hole on the upper end surface of the lower end cover boss, and it is installed in the three internal thread holes on the lower end cover boss.

[0010] Furthermore, the tilting pad is composed of three arc-shaped pads that only perform axial movement under the constraint of a columnar swing pivot. The pads are evenly distributed along the circumference of the stirring shaft. The end face of the tilting pad is provided with three eccentric circular through holes that are biased toward one side of the rotation direction of the stirring shaft along the circumference. A certain radial gap is left between the inner and outer walls of the tilting pad and the stirring shaft and the pad seat when they are installed to achieve the flow of lubricating oil. The eccentric circular through holes on the tilting pad cooperate with the gap of the swing pivot to ensure that a wedge-shaped gap is formed between the inner wall of the tilting pad and the stirring shaft to prevent the radial movement of the tilting pad. The smooth upper end face of the boss near the external thread of the swing pivot can support the lower end face of the tilting pad to avoid large friction resistance between the tilting pad and the contact surface when the tilting pad rotates.

[0011] Furthermore, circular through holes are provided on the top surface of the upper end cover near the stirring shaft and on the lower side of the shoe seat, which serve as an oil inlet and an oil outlet respectively, to ensure that the lubricating oil circulates in the gap between the shoe seat, the stirring shaft and the tilting shoe. The inner wall of the shoe seat is provided with three equidistant spiral oil return lines consistent with the rotation direction of the stirring shaft, so that the lubricating oil in the gap between the stirring shaft and the tilting shoe is evenly distributed in the vertical direction when the stirring shaft rotates, preventing the oil film from rupturing due to excessive local oil film pressure under the influence of gravity, and ensuring that the stirring shaft is located in the center with stable oil film pressure.

[0012] Furthermore, the positioning rod of the free-end vibration reduction and anti-deviation system is a solid cylindrical rod, which is welded at the center of the bottom surface of the cylinder; the T-shaped sealing cover plate is matched with the positioning rod gap and is sealed by a wear-resistant sealing ring, and the elastic deformation of the wear-resistant sealing ring is used to fill the gap to prevent the entry of slurry.

[0013] Furthermore, the outer surface of the T-shaped sealing cover plate boss is processed with an external thread, and the inner hole surface of the stirring shaft is processed with an internal thread matching therewith. The stirring shaft and the T-shaped sealing cover plate are connected by threads, and the buffer bushing is matched with the inner hole clearance of the stirring shaft. When the stirring shaft rotates, the free end of the stirring shaft is allowed to deflect 1 to 3° in the vertical direction, and the buffer bushing plays a role in buffering and vibration reduction. When the limit is exceeded, the positioning rod and the buffer bushing jointly ensure the centering of the stirring shaft.

[0014] Furthermore, the lining of the support system is connected to the inner wall of the cylinder and the grinding door by bolts, the support frame is arranged with six ribs at equal intervals along the circumferential direction and welded to the top surface of the cylinder, the grinding medium inlet, feed port and discharge port of the circulation system are all arranged on the same vertical plane and a series of through holes on the same side, the feed port is located on the side near the bottom of the cylinder, the discharge port is located on the side near the top of the cylinder, the grinding medium inlet is obliquely placed on the top surface of the cylinder near the support frame, and a grinding door is opened on the opposite side wall of the cylinder.

[0015] The beneficial effects of the present invention are:

[0016] 1. The vertical spiral self-correcting stirring mill device proposed by the present invention adopts a buffer bushing and a positioning rod to achieve vibration reduction and anti-deviation of the free end of the stirring shaft, which not only improves the centering of the stirring shaft, but also avoids the damage to the stirring shaft caused by local stress concentration.

[0017] 2. The present invention is based on the principle of dynamic pressure oil film. Three tilting shoes are arranged on the inner surface of the shoe seat to form a converging wedge-shaped gap with the stirring shaft. The dynamic pressure oil film formed under stable operation will generate pressure to automatically correct the deflection of the stirring shaft.

[0018] 3. In order to prevent the lubricating oil from gathering at the bottom under the action of gravity, resulting in uneven distribution of the oil film and excessive local pressure of the oil film, three spiral oil return lines are set on the inner surface of the tile seat. With the stable operation of the stirring shaft, the spiral oil return lines lift the lubricating oil and ensure the uniform distribution of the oil film.

[0019] 4. When the single-point supported tilting pad is arranged vertically, the upper and lower end surfaces of the tilting pad will deviate at one end and approach at the other end relative to the stirring shaft, and the wedge-shaped gap will be unstable. The swing pivot and the tilting pad are in surface contact. Compared with point contact, this ensures that the swing angle of the tilting pad wall around the swing pivot in the vertical direction is consistent, and a complete dynamic pressure oil film can be formed.

[0020] 5. Through the coordinated cooperation of the tilting pad self-correcting system and the free end vibration reduction and anti-deflection system, the free end of the agitator shaft can be guaranteed to be centered, and the vibration transmitted to the upper end of the agitator shaft can be automatically buffered and adjusted to prevent the aggravation of the deflection, thus realizing the self-correction of the agitator shaft in the vertical direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a cross-sectional view of the interior of a vertical spiral self-correcting stirring mill device.

[0022] Figure 2 The present invention is an axonometric view of a vertical spiral self-correcting stirring mill device.

[0023] Figure 3 It is a partial axonometric view of the tilting pad self-correcting system of a vertical spiral self-correcting stirring mill device of the present invention.

[0024] Figure 4 It is a partial enlarged view of the free end vibration reduction and anti-deviation system of a vertical spiral self-correcting stirring mill device of the present invention.

[0025] Figure 5 The present invention is a cross-sectional top view of a vertical spiral self-correcting stirring mill device.

[0026] Description of reference numerals:

[0027] 100 is a driving motor; 201 is a tilting pad, 202 is a lower end cover, 203 is a pad seat, 204 is a spiral oil return line, 205 is an upper end cover, 206 is an O-ring, 207 is an oil inlet, 208 is an oil outlet, 209 is a swing pivot, and 210 is a bolt; 301 is a positioning rod, 302 is a T-shaped sealing cover plate, 303 is a buffer bushing, and 304 is a wear-resistant sealing ring; 401 is a stirring shaft, 402 is a propeller blade; 501 is a cylinder, 502 is a liner, and 503 is a support frame; 601 is a grinding medium input port, 602 is a feed port, 603 is a discharge port, and 604 is a grinding door. DETAILED DESCRIPTION

[0028] In order to better explain the present invention, so as to facilitate understanding, the following Figures 1 to 5 , the present invention is described in detail through specific implementation methods.

[0029] The present invention provides a vertical spiral self-correcting stirring mill device, which includes a driving motor 100, a tilting pad self-correcting system 200, a free end vibration reduction and anti-deflection system 300, a stirring system 400, a supporting system 500, and a circulation system 600. The tilting pad self-correcting system 200 includes a tilting pad 201, a lower end cover 202, a pad seat 203, a spiral oil return line 204, an upper end cover 205, an O-ring 206, an oil inlet 207, an oil outlet 208, a swing pivot 209, and a bolt 210; the free end vibration reduction and anti-deflection system 300 includes a positioning rod 301, a T-shaped sealing cover plate 302, a buffer bushing 303, and a wear-resistant sealing ring 304; the stirring system 400 includes a stirring shaft 401 and a propeller blade 402; the support system 500 includes a cylinder 501, a liner 502, and a support frame 503; the circulation system 600 includes a grinding medium inlet 601, a feed inlet 602, a discharge port 603, and a grinding door 604.

[0030] Furthermore, the lower end cover 202 and the upper end cover 205 of the tilting pad self-correcting system 200 are each provided with six circular through holes evenly distributed around the circumference, and the outer surface of the boss of the lower end cover 202 is processed with an external thread line. On this basis, the upper end surface of the boss is processed with three internal thread holes evenly distributed around the circumference, and the lower end surface of the boss contacts the top surface of the cylinder and is connected by bolts 210. The upper end cover 205 is connected to the top surface of the support frame 503 by bolts 210, and the central circular through holes of the lower end cover 202 and the upper end cover 205 are both clearance-matched with the stirring shaft 401 and are sealed by an O-ring 206.

[0031] Furthermore, the tile seat 203 is annular, and the bottom of its inner wall surface is processed with an internal thread that can match the thread on the outer surface of the boss of the lower end cover 202. The bottom of the inner wall of the tile seat 203 is connected to the outer surface of the boss of the lower end cover 202 through a thread, and the upper end surface of the tile seat 203 and the lower surface of the upper end cover are glued and sealed by 205 to ensure a good sealing effect. The bottom of the swing pivot rod 209 is processed with an external thread that matches the internal thread hole on the upper end surface of the boss of the lower end cover 202, and it is installed in the three internal thread holes on the boss of the lower end cover 202.

[0032] Furthermore, the tilting pad 201 is composed of three arc-shaped pads that only perform axial movement under the constraint of a columnar swing pivot. The pads are evenly distributed along the circumference of the stirring shaft 401. The end face of the tilting pad 201 is provided with three eccentric circular through holes that are circumferentially biased toward one side of the rotation direction of the stirring shaft 401. A certain radial gap is left between the inner and outer walls of the tilting pad 201 and the stirring shaft 401 and the pad seat 203 when installed to achieve the flow of lubricating oil. The eccentric circular through holes on the tilting pad 201 are matched with the clearance of the swing pivot 209 to ensure that a wedge-shaped gap is formed between the inner wall of the tilting pad 201 and the stirring shaft 401 to prevent the tilting pad 201 from radial movement. The smooth upper end face of the boss near the external thread of the swing pivot 209 can support the lower end face of the tilting pad 201 to avoid a large friction resistance between the tilting pad 201 and the contact surface when the tilting pad 201 rotates.

[0033] Furthermore, circular through holes are provided on the top surface of the upper end cover 205 near the stirring shaft 401 and on the lower side of the shoe seat 203, which serve as an oil inlet 207 and an oil outlet 208 respectively, to ensure that the lubricating oil circulates in the gap between the shoe seat 203, the stirring shaft 401 and the tilting shoe 201. The inner wall of the shoe seat 203 is provided with three equidistant spiral oil return lines 204 consistent with the rotation direction of the stirring shaft 401, so that the lubricating oil in the gap between the stirring shaft 401 and the tilting shoe 201 can be evenly distributed in the vertical direction when the stirring shaft 401 rotates, to prevent the oil film from rupture due to excessive local oil film pressure under the influence of gravity, and to ensure that the stirring shaft 401 is located in the center with a stable oil film pressure.

[0034] Furthermore, the positioning rod 301 of the free-end vibration reduction and anti-deviation system 300 is a solid cylindrical rod, which is welded at the center of the bottom surface of the cylinder 501; the T-shaped sealing cover plate 302 is loosely matched with the positioning rod 301 and is sealed by a wear-resistant sealing ring 304, and the elastic deformation of the wear-resistant sealing ring 304 is used to fill the gap to prevent the entry of slurry.

[0035] Furthermore, the outer surface of the boss of the T-shaped sealing cover plate 302 is processed with an external thread, and the inner surface of the inner hole of the stirring shaft 401 is processed with an internal thread matching therewith. The stirring shaft 401 is connected to the T-shaped sealing cover plate 302 by threads, and the buffer bushing 303 is matched with the inner hole clearance of the stirring shaft 401. When the stirring shaft 401 rotates, the free end of the stirring shaft 401 is allowed to deflect by 1 to 3 degrees in the vertical direction. The buffer bushing 303 plays a role in buffering and vibration reduction. When the limit is exceeded, the positioning rod 301 and the buffer bushing 303 jointly ensure the centering of the stirring shaft 401.

[0036] Furthermore, the lining plate 502 of the support system 500 is connected to the inner wall of the cylinder 501 and the grinding door 604 by bolts, the support frame 503 has six ribs arranged at equal intervals along the circumferential direction and welded to the top surface of the cylinder 501, the grinding medium inlet 601, the feed port 602, and the discharge port 603 of the circulation system 600 are all arranged on the same vertical plane and a series of through holes on the same side, the feed port 602 is located on the side of the cylinder 501 near the bottom, the discharge port 603 is located on the side of the cylinder 501 near the top, the grinding medium inlet 601 is obliquely placed on the top surface of the cylinder 501 near the support frame 503, and a grinding door 604 is opened on the opposite side wall of the cylinder 501.

[0037] The working process of the present invention is as follows: in a safe working space, first install and fix the cylinder 501, weld the positioning rod 301 at the center of the bottom surface of the cylinder 501, install the T-shaped sealing cover plate 302, the buffer bushing 303, and the wear-resistant sealing ring 304 in sequence to ensure the centering accuracy; then, on the basis of the centering installation of the stirring shaft 401, ensure the matching accuracy of the tilting pad self-correcting system 200 and the stirring shaft 401, and inject lubricating oil into the oil inlet 207 to fill the gap between the stirring shaft 401 and the tilting pad 201; then put the grinding medium and The slurry is prepared for grinding operation. The drive motor 100 is started. First, the stirring shaft 401 rotates clockwise, so that the propeller blades 402 welded on the stirring shaft 401 drive the medium balls and the slurry near the bottom of the cylinder 501 to make a spiral upward motion. This working state is the starting state. In this state, the buffer bushing 303 in the free end vibration reduction and anti-bias system 300 reduces the impact and friction of the grinding medium and the slurry on the free end of the stirring shaft 401. In order to prevent excessive local stress, the free end of the stirring shaft 401 is allowed to move in the vertical direction. The tilting pad 201 is tilted by 1 to 3 degrees, and the positioning rod 301 is used to ensure that the stirring shaft 401 is in the center position; as the rotation speed of the stirring shaft 401 is further increased, the wedge-shaped oil film pressure formed by the lubricating oil in the tilting pad self-correcting system 200 is sufficient to overcome the gravity and friction of the tilting pad 201, and the tilting pad 201 begins to swing, and gradually forms a converging wedge-shaped gap with the stirring shaft 401. This working state is an accelerated state. In this state, the fluidity of the lubricating oil is insufficient to form an unstable oil film, and the free end vibration reduction and anti-deflection system 300 still plays a centering role. After a stable wedge-shaped oil film is formed, the oil film pressure generated by the wedge-shaped oil film is balanced with the external load, so that the stirring shaft 401 can be stably operated in the correct position; as the stirring shaft 401 operates stably, the spiral oil return line 104 lifts the lubricating oil and improves the reliability of the wedge-shaped oil film. This working state is a stable state. In this state, the wedge-shaped oil film is balanced with the external load to automatically control the radial position error of the stirring shaft 401. The free-end vibration reduction and anti-deviation system 300 only plays a role of buffering and vibration reduction, and can fully realize the self-correction of vertical positioning.

[0038] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A vertical spiral self-correcting stirring mill device, characterized in that: It includes a driving motor, a tilting pad self-correcting system, a free end vibration reduction and anti-deflection system, a stirring system, a support system, and a circulation system. The tilting pad self-correcting system includes a tilting pad, a lower end cover, a pad seat, a spiral oil return line, an upper end cover, an O-ring, an oil inlet, an oil outlet, a swing pivot, and bolts; the free end vibration reduction and anti-deflection system includes a positioning rod, a T-shaped sealing cover plate, a buffer bushing, and a wear-resistant sealing ring; the stirring system includes a stirring shaft and propeller blades; the support system includes a cylinder, a liner, and a support frame; the circulation system includes a grinding medium input port, a feed port, a discharge port, and a grinding door.

2. A vertical spiral self-correcting stirring mill device according to claim 1, characterized in that: The lower end cover and the upper end cover of the tilting pad self-correcting system are both provided with six circular through holes evenly distributed around the circumference, the outer surface of the boss of the lower end cover is processed with external thread lines, and the upper end surface of the boss is processed with three internal thread holes evenly distributed around the circumference, the lower end surface of the boss contacts the top surface of the cylinder and is connected by bolts, the upper end cover is connected to the top surface of the support frame by bolts, and the central circular through holes of the lower end cover and the upper end cover are both matched with the clearance of the stirring shaft and are sealed by O-rings.

3. A vertical spiral self-correcting stirring mill device according to claim 2, characterized in that: The tile seat is in the shape of a circular ring, and the bottom of its inner wall is processed with an internal thread that can match the thread on the outer surface of the lower end cover boss. The bottom of the inner wall of the tile seat and the outer surface of the lower end cover boss are connected by threads, and the upper end surface of the tile seat and the lower surface of the upper end cover are sealed by gluing to ensure a good sealing effect. The bottom of the swing pivot is processed with an external thread that matches the internal thread hole on the upper end surface of the lower end cover boss, and it is installed in the three internal thread holes on the lower end cover boss.

4. A vertical spiral self-correcting stirring mill device according to claim 2, characterized in that: The tilting pad is composed of three arc-shaped pads that can only move axially under the constraint of a columnar swing pivot. The pads are evenly distributed along the circumference of the stirring shaft. The end face of the tilting pad is provided with three eccentric circular through holes that are biased toward one side of the rotation direction of the stirring shaft along the circumference. A certain radial gap is left between the inner and outer walls of the tilting pad and the stirring shaft and the pad seat when they are installed to achieve the flow of lubricating oil. The eccentric circular through holes on the tilting pad cooperate with the gap of the swing pivot to ensure that a wedge-shaped gap is formed between the inner wall of the tilting pad and the stirring shaft to prevent the radial movement of the tilting pad. The smooth upper end face of the boss near the external thread of the swing pivot can support the lower end face of the tilting pad to avoid large friction resistance between the tilting pad and the contact surface when the tilting pad rotates.

5. The vertical spiral self-correcting stirring mill device according to claim 2 is characterized in that: Circular through holes are provided on the top surface of the upper end cover near the stirring shaft and on the lower side of the shoe seat, which serve as oil inlet and oil outlet respectively, to ensure that the lubricating oil circulates in the gap between the shoe seat, the stirring shaft and the tilting shoe. The inner wall of the shoe seat is provided with three equidistant spiral oil return lines consistent with the rotation direction of the stirring shaft, to achieve uniform distribution of the lubricating oil in the vertical direction of the gap between the stirring shaft and the tilting shoe when the stirring shaft rotates, to prevent oil film rupture caused by excessive local oil film pressure under the influence of gravity, and to ensure that the stirring shaft is located in the center with stable oil film pressure.

6. A vertical spiral self-correcting stirring mill device according to claim 1, characterized in that: The positioning rod of the free-end vibration reduction and anti-deviation system is a solid cylindrical rod welded at the center of the bottom surface of the cylinder; the T-shaped sealing cover plate is in gap with the positioning rod and is sealed by a wear-resistant sealing ring, and the elastic deformation of the wear-resistant sealing ring is used to fill the gap to prevent the slurry from entering.

7. A vertical spiral self-correcting stirring mill device according to claim 6, characterized in that: The outer surface of the T-shaped sealing cover plate boss is processed with an external thread, and the inner hole surface of the stirring shaft is processed with an internal thread that matches it. The stirring shaft and the T-shaped sealing cover plate are connected by threads, and the buffer bushing is clearance-matched with the inner hole of the stirring shaft. When the stirring shaft rotates, the free end of the stirring shaft is allowed to deflect 1 to 3 degrees in the vertical direction. The buffer bushing plays a role in buffering and vibration reduction. When the limit is exceeded, the positioning rod and the buffer bushing jointly ensure the centering of the stirring shaft.

8. The vertical spiral self-correcting stirring mill device according to claim 1 is characterized in that: The lining plate of the support system is connected to the inner wall of the cylinder and the grinding door by bolts. The support frame is arranged with six ribs at equal intervals along the circumferential direction and welded to the top surface of the cylinder. The grinding medium inlet, feed port and discharge port of the circulation system are all arranged on the same vertical plane and a series of through holes on the same side. The feed port is located on the side of the cylinder near the bottom, the discharge port is located on the side of the cylinder near the top, the grinding medium inlet is obliquely placed on the top surface of the cylinder near the support frame, and a grinding door is opened on the wall of the opposite side of the cylinder.

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