CN114054160A

CN114054160A - Medium speed pulverizer grinding roller device

Info

Publication number: CN114054160A
Application number: CN202111451217.0A
Authority: CN
Inventors: 张峰彬; 何亚群; 谢卫宁; 李金龙; 韦能; 张真兴
Original assignee: China University of Mining and Technology CUMT
Current assignee: China University of Mining and Technology CUMT
Priority date: 2021-12-01
Filing date: 2021-12-01
Publication date: 2022-02-18
Anticipated expiration: 2041-12-01
Also published as: CN114054160B

Abstract

The invention discloses a grinding roller device of a medium-speed coal mill, which comprises a fixed part of a winch shaft seat, a roller frame, a shaft sleeve, a roller core, a right pressing plate, a roller shaft, a non-return sealing air short pipe and a transparent cover. The damage to the grinding roller seat of the grinding machine when the grinding roller is disassembled is reduced through the fixing part of the grinding roller seat; meanwhile, the roller frame is provided with a sealing opening and a non-return sealing air short pipe is additionally arranged, so that the uniform distribution of sealing air pressure is promoted, and the dust prevention efficiency of sealing air is improved; the right pressing plate, the roll shaft, the axis air pipe, the right pressing plate and the shaft sleeve form an oil injection and ash removal cavity, so that the grinding roll can be conveniently subjected to oil injection and ash removal operation; the shaft sleeve and the transparent cover form a group of labyrinth seal structures, so that the sealing performance of the root of the grinding roller is enhanced; the boss is arranged on one side of the large end of the roller core, so that the roller sleeve is positioned when the roller core is convenient to install, the maintenance flow of the grinding roller of the grinding machine is simplified, the abrasion speed of a bearing of the grinding roller is reduced, the maintenance frequency of the grinding machine for disassembling the grinding machine is reduced, the daily maintenance period is shortened, and the fault-free service time of the medium-speed coal grinding machine is prolonged.

Description

Medium speed pulverizer grinding roller device

Technical Field

The invention relates to a grinding roller device of a medium-speed coal mill, in particular to a semi-industrial roller type vertical mill system suitable for a mineral material crushing and grading process.

Technical Field

By 2050, primary energy consumption percentage still reached 66.3% in the world's energy structure, while coal accounted for 24.7% of the total primary energy consumption, most of which was used for power generation. Meanwhile, the consumption amount and the consumption proportion of coal are in high positions for a long time, and the continuous 12-year stable increase of the capacity of the thermal power generator also indicates that thermal power is not changed as a main power generation mode for a long time. Inhalable particles, sulfur oxides, nitrogen oxides and the like generated by coal combustion are one of the main causes of air pollution. How to realize high-efficiency utilization of coal and energy conservation and environmental protection through self-restraint and continuous improvement of technical level is a problem which is urgently needed to be solved by coal processing and utilizing workers and power plant workers. Carbon peak-reaching and carbon neutralization are the subjects of urgent concern in all countries in the world at present, and the steady, orderly and safe carbon reduction is proposed, so that the condition of coal electricity as basic energy and peak-shaving energy does not change in a short time. The medium speed coal mill is used as the main equipment for grinding coal and making powder, wherein the ZGM type mill accounts for the highest percentage and is about 75 percent. In the early medium-speed coal mill, a static separator is adopted to separate qualified coal powder, but the separation precision and efficiency are relatively poor, so that the application of a dynamic separator with higher separation precision is gradually increased by adding a moving part. After 2001, the coal mill is gradually applied to a ZGM series medium speed coal mill.

The carbon peak-reaching scheme indicates that the coal consumption standard of the newly-built unit is to reach the international advanced level, and simultaneously, the backward capacity of coal power is orderly eliminated, and the energy-saving upgrading and the flexible transformation of the active unit are accelerated. In order to accelerate the upgrading and reconstruction of the medium-speed coal mill, the crushing and grading mechanism of the mill is proved, and a semi-industrial-grade continuous crushing and grading test is necessary to be carried out in view of the black box structure of the medium-speed coal mill. For this purpose, a semi-industrial medium speed coal mill is produced.

The grinding roll of the coal mill is a main part for crushing materials. The grinding roller of the coal mill used at present has the following defects: firstly, because sealed wind lets in from the roller top, sheltering from of roller leads to sealed wind to distribute inhomogeneously, and the blowback effect is poor, can't guarantee grinding roller root leakproofness, and the fine material after the breakage gets into grinding roller bearing chamber through the grinding roller root and arouses the quick wearing and tearing of bearing and grinding roller jam, increases mill jam trouble frequency of occurrence, increases and shuts down maintenance frequency and equipment maintenance cost. Secondly, the oil blanket is the vulnerable part, and the oil blanket leads to the oil blanket to damage the back and gets into the bearing cavity easily and cause the influence to the bearing with bearing cavity direct communication. Thirdly, the roller sleeve is not accurately installed and positioned and is easy to be installed in place; the grinding roller seat is easy to be assembled and disassembled due to thread abrasion caused by collision when the grinding roller is disassembled, and a large amount of working hours are consumed for processing. Finally, the semi-industrial mill has compact structure and small volume, so that the grinding roller bearing cavity is required to be hoisted and disassembled for oiling and overhauling the mill separator, and the maintenance workload and the maintenance difficulty are greatly increased. Based on the reasons, the novel grinding roller device provided by the invention can finish the daily maintenance of the grinding roller through the observation window on the mill shell, so that the machine disassembling frequency of the mill is reduced, the maintenance cost is reduced, meanwhile, the sealing property of the root part of the grinding roller is enhanced, the probability of dust entering a bearing cavity is reduced, the distribution uniformity of the air pressure of sealing air is increased, and the fault-free service time of a semi-industrial medium-speed coal mill is prolonged.

Disclosure of Invention

The technical problem is as follows: the invention aims to overcome the defects in the prior art and provides the medium-speed coal mill grinding roller device which has the advantages of compact structure, convenience in maintenance, good sealing performance and high installation precision and can reduce the frequency of disassembling a mill caused by jamming or regular maintenance of the grinding roller.

The technical scheme is as follows: the invention relates to a medium-speed coal mill grinding roller device, which comprises a pressing frame, a twisting shaft seat, a roller frame, a wedge ring, an end cover, a mill shell, an observation window cover, a self-aligning bearing, a bearing outer spacer bush, a roller bearing, a bearing inner spacer bush, a left pressing plate, a roller core, an axis air pipe and a shaft sleeve, wherein the pressing frame is arranged on the roller frame; the grinding machine is characterized in that a pressing frame arranged in a shell of the grinding machine is provided with a twisting shaft seat fixing part connected with a twisting shaft seat, the twisting shaft seat is hinged with a roller frame capable of freely finely adjusting the angle of a grinding roller during the transient change of the grinding working condition, a roller shaft with the left end fixed on the roller frame is arranged in the shaft sleeve, the axis of the roller shaft is provided with a large, medium and small three-stage stepped hole from left to right, a roller core is sleeved on the roller shaft, a self-aligning bearing, a bearing inner spacer sleeve, a bearing outer spacer sleeve and a roller bearing which are sleeved on the roller shaft are sequentially arranged in the roller core, the outer end of the roller bearing is provided with the shaft sleeve, a transparent cover and a top cover, the top cover is fixed on the large end surface of the roller core through a transparent cover through bolts, and an oil seal is arranged in a cavity gap between the top cover and the transparent cover; the shaft sleeve and the roller shaft are concentric and in interference fit; the right end of the roll shaft is provided with a right pressing plate in threaded connection with the small central hole of the roll shaft, the left end of the roll shaft is provided with an axis air pipe and a left pressing plate fixed on the roll frame, and the left pressing plate is in contact with a pipe head of the axis air pipe; the left pressure plate is provided with a reverse-stopping sealing air short pipe fixed on the roller frame in a vertical or horizontal symmetry manner; the observation window and the observation window cover are fixed on the mill shell facing to one side of the left pressing plate, and the lower edge of the observation window is tangent to the upper edge of the roll shaft.

The hinge base fixing part comprises a flange plate and a cylinder connected to the flange plate, a plurality of through holes are uniformly distributed in the circumferential direction of the flange plate, chamfers are formed in the edges of the through holes, a central hole penetrating through the cylinder is formed in the middle of the flange plate, an outer hexagon bolt is arranged in the central hole, a positioning hole with the diameter larger than the central diameter is formed in the lower end of the cylinder, and a threaded hole connected with the hinge base in a threaded mode is formed in the central hole.

The roller frame comprises hinge shaft fixing lugs symmetrically arranged on one side face of the upper edge of the roller frame, a roller shaft hole is formed in the lower portion of the roller frame, pressing plate fixing bosses are arranged at orifices of the roller shaft hole, and sealing air inlets are symmetrically distributed on the upper side and the lower side or the left side and the right side of each pressing plate fixing boss.

One side of the big end surface of the roller core is provided with a roller core boss buckled with the shaft sleeve.

The right pressing plate comprises a right pressing plate air guide hole and a plurality of right pressing plate light holes, the right pressing plate air guide hole is located in the axis position of the surface of the pressing plate, the right pressing plate light holes are evenly distributed on the periphery of the right pressing plate air guide hole, and the diameter of the right pressing plate air guide hole is equal to the diameter of a right small round hole of the roll shaft.

A plurality of right pressing plate holes corresponding to the light hole positions of the right pressing plate are uniformly distributed on the right end surface of the roll shaft; the ratio of the diameter of a primary hole to the diameter of a shaft is 2: 3, the diameter is gradually decreased in an equal difference manner, the length-diameter ratio of the hole is less than 5 times, and a small hole on the right side of the three-stage stepped hole is tapped with threads; the outer fringe of the roll shaft is provided with two-stage bosses, and a plurality of roll shaft small holes which are radially and uniformly distributed are distributed on the bosses.

The non-return sealing air short pipe comprises two groups of non-return sealing air short pipe baffle plates and non-return sealing air short pipe suspension baffle plates, the non-return sealing air short pipe baffle plates are arranged near the right side outlet in the non-return sealing air short pipe, the sealing air short pipe baffle plates are connected with the pipe wall in an inclined mode, the non-return sealing air short pipe suspension baffle plates are parallel to the non-return sealing air short pipe baffle plates, gaps are reserved between the non-return sealing air short pipe suspension baffle plates and the pipe wall, and the sum of the widest distances of the gaps on the two sides is equal to the spacing distance between the non-return sealing air short pipe suspension baffle plates; the maximum distance between the non-return sealing air short pipe baffle and the non-return sealing air short pipe suspended baffle is equal to the thickness of the baffle; the distance from the top of the baffle plate of the non-return sealing air short pipe to the right outlet of the non-return sealing air short pipe is 1.5 times of the pipe diameter, and external threads of the non-return sealing air short pipe are tapped on two sides of the non-return sealing air short pipe.

The shaft sleeve comprises a large shaft sleeve round hole and a small shaft sleeve round hole which form a step type, the large shaft sleeve round hole is in interference fit with a boss on the roller shaft, the large shaft sleeve round hole is tangent to the small roller shaft hole on the roller shaft, and meanwhile, the small shaft sleeve round hole is in interference fit with the roller shaft; the outside of the shaft sleeve is provided with a shaft sleeve circular boss.

The transparent cover is provided with a boss ring with a plurality of grooves near the axis, and the boss ring is buckled with a shaft sleeve ring boss distributed on the outer side of the shaft sleeve to form a labyrinth seal structure.

Has the advantages that: by changing the structure of the grinding roller, the invention can finish the routine maintenance of the grinding roller through the observation window on the shell of the grinding machine, reduce the frequency of disassembling the grinding machine, reduce the maintenance cost, strengthen the sealing property of the root part of the grinding roller, reduce the probability of dust entering a bearing cavity, increase the distribution uniformity of the air pressure of the sealing air and improve the fault-free service time of the semi-industrial medium-speed coal grinding machine. Compared with the prior art, the main advantages are as follows:

1. the sealing air system is improved, single-port air inlet is changed into double-port air inlet, the wind pressure distribution at the root of the grinding roller is improved, and subdivided entry is reduced; meanwhile, the non-return sealing air short pipe is additionally arranged, the flow speed of the air flow at the outlet is increased under the condition that the movable part is not increased, and the blockage of the sealing air pipe caused by the backward flow of the air flow is prevented.

2. A labyrinth seal structure is added, so that the sealing property of the root of the grinding roller is further improved; the diameter of the inner hole of the top cover is reduced, and the bearing is prevented from entering a bearing cavity to damage the bearing after the oil seal is damaged.

3. The roller shaft is axially provided with a hole, the hole reaches the right side of a bearing cavity of the grinding roller directly, an axis air pipe is installed, a plurality of uniformly distributed small holes are radially formed in the boss position of the roller shaft, and the structure and the bearing cavity form a communicated cavity for daily dust cleaning, air blowing and oil injection operation.

4. A positioning boss is added on the roller core to facilitate the installation and positioning of the roller sleeve.

5. The twisting shaft seat fixing part is added, so that the twisting shaft seat is prevented from being damaged during disassembly and assembly, and the maintenance cost is reduced.

Drawings

Fig. 1 is a schematic structural view of a grinding roller device of a medium speed coal mill according to the present invention;

fig. 2 is a schematic longitudinal sectional view of a grinding roller device of a medium speed coal mill according to the present invention;

FIG. 3 is a schematic view of the hinge base mount of FIG. 1;

FIG. 4 is a schematic structural view of the roll stand of FIG. 1;

FIG. 5 is a schematic structural view of the roll core of FIG. 1;

FIG. 6 is a schematic structural view of the right platen of FIG. 1;

FIG. 7 is a schematic view of the construction of the roll shaft of FIG. 1;

FIG. 8 is a schematic structural view of the non-return sealing wind pipe stub of FIG. 1;

FIG. 9 is a schematic structural view of the bushing of FIG. 1;

FIG. 10 is a schematic structural view of the transparent cover of FIG. 1;

in the figure: a winch shaft seat fixing piece-1, a shaft seat fixing piece unthreaded hole-1A, a through hole chamfer-1B, a flange plate-1C, a cylinder-1D, a pressing frame-2, a winch shaft seat-3, a roller frame-4, a winch shaft fixing lug-4A, a roller shaft hole-4B, a pressing plate fixing boss-4C, a sealing air inlet-4D, a wedge ring-5, an end cover-6, a mill shell-7, an observation window-8, an observation window cover-9, a roller sleeve-10, a roller core-11, a roller core boss-11A, a right pressing plate-12, a right pressing plate air guide hole-12A, a right pressing plate unthreaded hole-12B, a roller shaft-13, a right pressing plate hole-13A, a three-level round hole-13B, a roller shaft small hole 13C, a roller shaft small hole 13D and a self-aligning bearing-14, the bearing comprises an outer bearing spacer bush-15, a roller bearing-16, an inner bearing spacer bush-17, a left pressure plate-18, an axial air pipe-19, a non-return sealing air short pipe-20, a non-return sealing air short pipe external thread-20A, a non-return sealing air short pipe baffle-20B, a non-return sealing air short pipe suspended baffle-20C, a shaft sleeve-21, a large shaft sleeve circular hole-21A, a small shaft sleeve circular hole-21B, a shaft sleeve circular boss-21C, a transparent cover-22, a circular boss-22A, an oil seal-23 and a top cover-24.

Detailed Description

The invention will be further described with reference to examples in the drawings to which:

as shown in fig. 1 and fig. 2, the medium speed coal mill grinding roller device of the invention is mainly composed of a grinding roller base fixing part 1, a pressing frame 2, a grinding roller base 3, a roller frame 4, a wedge ring 5, an end cover 6, a mill casing 7, an observation window 8, an observation window cover 9, a self-aligning bearing 14, a bearing outer spacer 15, a roller bearing 16, a bearing inner spacer 17, a left pressing plate 18, a roller core 11, an axis air pipe 19, a shaft sleeve 21, a transparent cover 22, an oil seal 23 and a top cover 24; a grinding shaft seat fixing part 1 connected with a grinding shaft seat 3 is arranged on a pressing frame 2 arranged in a mill shell 7, the grinding shaft seat 3 is hinged with a roller frame 4 capable of freely finely adjusting the angle of a grinding roller during the instantaneous change of a grinding working condition, a roller shaft 13 with the left end fixed on the roller frame 4 is arranged in a shaft sleeve 21, the axis of the roller shaft 13 is provided with a large, medium and small three-stage step hole from left to right, a roller core 11 is sleeved on the roller shaft 13, a self-aligning bearing 14, a bearing inner spacer sleeve 17, a bearing outer spacer sleeve 15 and a roller bearing 16 which are sleeved on the roller shaft 13 are sequentially arranged in the roller core 11, the outer end of the roller bearing 16 is provided with the shaft sleeve 21, a transparent cover 22 and a top cover 24, the top cover 24 is fixed on the large end surface of the roller core 11 through a transparent cover 22 through bolts, and an oil seal 23 is arranged in a cavity gap between the top cover 24 and the transparent cover 22; the shaft sleeve 21 is concentric with the roller shaft 13 and is in interference fit with the roller shaft; the right end of the roll shaft 13 is provided with a right pressing plate 12 in threaded connection with a small central hole of the roll shaft, the left end of the roll shaft 13 is provided with an axis air pipe 19 and a left pressing plate 18 fixed on the roll frame 4, and the left pressing plate 18 is in contact with the pipe head of the axis air pipe 19; the left pressure plate 18 is provided with a reverse-stopping sealing air short pipe 20 fixed on the roller frame 4 in an up-down or left-right symmetrical manner; the observation window 8 and the observation window cover 9 are fixed on the mill shell 7 facing one side of the left pressure plate 18, and the lower edge of the observation window 8 is tangent with the upper edge of the roll shaft 13.

As shown in fig. 3, the twisting shaft base fixing part 1 comprises a flange plate 1C and a cylinder 1D connected to the flange plate 1C, 6 through holes 1A are uniformly distributed in the circumferential direction of the flange plate 1C, a chamfer 1B is formed at the edge of each through hole 1A, a central hole penetrating through the cylinder 1D is formed in the middle of the flange plate 1C, an outer hexagon bolt 1G is arranged in the central hole, a positioning hole 1E with the diameter larger than the central diameter is formed in the lower end of the cylinder 1D, and a threaded hole 1F connected with the twisting shaft base 3 through threads is formed in the central hole.

As shown in fig. 4, the roller frame 4 includes hinge fixing lugs 4A symmetrically arranged on one side of the upper edge of the roller frame, a roller shaft hole 4B is formed in the lower portion of the roller frame, pressing plate fixing bosses 4C are arranged at the hole openings of the roller shaft hole 4B, and sealing air inlets 4D are symmetrically distributed on the upper side and the lower side or the left side and the right side of each pressing plate fixing boss 4C.

As shown in fig. 5, a roll core boss 11A fastened with the sleeve 10 is provided on one side of the large end surface of the roll core 11 to limit the installation position of the roll sleeve 10 and improve the accuracy of the sleeve installation.

As shown in fig. 6, the right press plate 12 includes a right press plate air guide hole 12A located at the axis of the press plate surface and a plurality of right press plate light holes 12B uniformly distributed around the right press plate air guide hole 12A, the diameter of the right press plate air guide hole 12A is equal to the diameter of the right small round hole 13B of the roll shaft 13, and the right press plate air guide hole is used for air guiding and lubricating oil injecting channels during ash removal; and 4 right press plate unthreaded holes 12B are uniformly distributed in the right press plate 12 in the radial direction and are used for being fixed with the roll shaft 13.

As shown in fig. 7, a plurality of right press plate holes 13A corresponding to the hole positions of the right press plate unthreaded holes 12B are uniformly distributed on the right end surface of the roller shaft 13; the axle center of the roll shaft 13 is from the big, medium and small three-stage stepped hole of left to right, the ratio of the diameter of the first stage hole to the axle diameter is 2: 3, the diameter is gradually decreased in an equal difference manner, the length-diameter ratio of the hole is less than 5 times, and a small hole on the right side of the three-stage stepped hole is tapped with threads; the outer edge of the roll shaft 13 is provided with a two-stage boss 13D, and a plurality of roll shaft small holes 13C which are uniformly distributed in the radial direction are distributed on the boss and used as an air outlet during ash removal operation or a lubricating oil outlet during lubricating oil replacement.

As shown in fig. 8, the reverse-stopping sealed air short pipe 20 includes two sets of reverse-stopping sealed air short pipe baffle plates 20B and reverse-stopping sealed air short pipe suspension baffle plates 20C arranged near the right side outlet in the reverse-stopping sealed air short pipe 20, the sealed air short pipe baffle plates 20B are connected with the pipe wall in an inclined manner, the reverse-stopping sealed air short pipe suspension baffle plates 20C are parallel to the reverse-stopping sealed air short pipe baffle plates 20B, a gap is reserved between the reverse-stopping sealed air short pipe baffle plates and the pipe wall, and the sum of the widest distances of the gaps at the two sides is equal to the distance between the reverse-stopping sealed air short pipe suspension baffle plates 20C; the maximum distance between the check sealing air short pipe baffle 20B and the check sealing air short pipe suspension baffle 20C is equal to the thickness of the baffles; the distance from the top of the baffle plate 20C of the non-return sealing air short pipe to the right outlet of the non-return sealing air short pipe 20 is 1.5 times of the pipe diameter, and external threads 20A of the non-return sealing air short pipe are tapped on two sides of the non-return sealing air short pipe 20 to prevent sealing air from flowing backwards into the air pipe.

As shown in fig. 9, the shaft sleeve 21 includes a large shaft sleeve circular hole 21A and a small shaft sleeve circular hole 21B which form a step, the large shaft sleeve circular hole 21A is in interference fit with the boss 13D on the roller shaft 13, the large shaft sleeve circular hole 21A is tangent to the small roller shaft hole 13C on the roller shaft 13, and the small shaft sleeve circular hole 21B is in interference fit with the roller shaft 13; the outside of axle sleeve 21 is equipped with axle sleeve ring boss 21C.

As shown in fig. 10, a boss ring 22A with a plurality of grooves is disposed near the axial center of the transparent cover 22, and the boss ring 22A is engaged with a boss ring boss 21C distributed on the outer side of the sleeve 21 to form a labyrinth structure.

When the grinding roller is maintained in daily life, the observation window cover 9 on the mill shell 7 is opened, the left pressing plate 18 of the grinding roller is taken down through the observation window 8, the axis air pipe 19 is connected with the air compressor, the valve of the air compressor is opened, air is introduced into the axis air pipe 19, lubricating oil is taken out from the bearing cavity of the mill by the air, continuous purging is carried out for a period of time, after purging is completed, lubricating oil is introduced into the bearing cavity through the axis air pipe 19 until the lubricating oil flows out from the small hole 13C of the roller shaft, and the oil injection operation is completed.

When the grinding roller is disassembled and maintained, the grinding machine is disassembled by hoisting, and then the pressing frame 2 and the grinding roller are integrally hoisted out. The bolt on the surface of the winch shaft seat fixing part 1 is unscrewed, then the grinding roller is dragged lightly by one person, the grinding roller is twisted and clamped on the boss 1D of the shaft seat fixing part by one person through a shifting wrench, the winch shaft seat fixing part 1 is slowly unscrewed, and the grinding roller is put down lightly. And taking down the non-return sealing air short pipe 20 on the roller frame 4, and performing ash removal treatment by using compressed air. The left pressure plate 18, the end cap 6 and the right pressure plate 12 are removed in this way, and the grinding roller is pressed out of the roller shaft 13 in its entirety using a hydraulic device. The through cover 22, the oil seal 23 and the top cover 24 are disassembled, the oil seal belongs to a vulnerable part and needs to be replaced periodically, the hydraulic device is continuously used for extruding the self-aligning bearing 14, the bearing outer spacer 15, the roller bearing 16 and the bearing inner spacer 17, and compressed air is used for cleaning. And (3) removing the bolts on the surface of the wedge ring 5, then tapping the surface of the wedge ring 5 by using a hammer, taking down the wedge ring after the wedge ring becomes loose, and then taking down the roller sleeve 10. The roll sleeve 10 is easy to wear after long-term work, so that the output force of the industrial mill is changed, the test result is influenced, and the roll sleeve needs to be replaced according to the condition. The roll shaft 13 is separated from the roll stand 4 using a hydraulic device, and then all parts are subjected to ash removal in all directions using compressed air. After the maintenance is finished, the device is reversely installed according to the previous action.

Claims

1. A grinding roller device of a medium-speed coal mill comprises a pressing frame (2), a hinge shaft seat (3), a roller frame (4), a wedge ring (5), an end cover (6), a mill shell (7), an observation window (8), an observation window cover (9), a self-aligning bearing (14), a bearing outer spacer (15), a roller bearing (16), a bearing inner spacer (17), a left pressing plate (18), a roller core (11), an axis air pipe (19) and a shaft sleeve (21); the method is characterized in that: the grinding machine is characterized in that a pressing frame (2) arranged in a mill shell (7) is provided with a twisting shaft seat fixing part (1) connected with a twisting shaft seat (3), the twisting shaft seat (3) is hinged with a roller frame (4) capable of freely finely adjusting the angle of a grinding roller during the transient change of a grinding working condition, a roller shaft (13) with the left end fixed on the roller frame (4) is arranged in the shaft sleeve (21), the shaft center of the roller shaft (13) is provided with a large, medium and small three-stage step hole from left to right, a roller core (11) is sleeved on the roller shaft (13), a self-aligning bearing (14) sleeved on the roller shaft (13), a bearing inner spacer sleeve (17), a bearing outer spacer sleeve (15) and a roller bearing (16) are sequentially arranged in the roller core (11), the outer end of the roller bearing (16) is provided with the shaft sleeve (21), a transparent cover (22) and a top cover (24), and the top cover (24) is fixed on the large end face of the roller core (11) through the transparent cover (22) through bolts, an oil seal (23) is arranged in a cavity gap between the top cover (24) and the transparent cover (22); the shaft sleeve (21) is concentric with the roller shaft (13) and is in interference fit with the roller shaft; the right end of the roll shaft (13) is provided with a right pressing plate (12) in threaded connection with a small central hole of the roll shaft, the left end of the roll shaft (13) is provided with an axis air pipe (19) and a left pressing plate (18) fixed on the roll frame (4), and the left pressing plate (18) is in contact with a pipe head of the axis air pipe (19); the left pressure plate (18) is provided with non-return sealing air short pipes (20) fixed on the roller frame (4) in a vertical or horizontal symmetry manner; the observation window (8) and the observation window cover (9) are fixed on the mill shell (7) facing one side of the left pressing plate (18), and the lower edge of the observation window (8) is tangent to the upper edge of the roll shaft (13).

2. The medium speed pulverizer grinding roller apparatus of claim 1, characterized in that: hank pedestal mounting (1) including ring flange (1C) and cylinder (1D) of connection on ring flange (1C), the equipartition has a plurality of through-holes (1A) in the circumference of ring flange (1C), open at through-hole (1A) edge has chamfer (1B), open at the middle part of ring flange (1C) has the centre bore that pierces through cylinder (1D), be equipped with outer hexagon bolt (1G) in the centre bore, open cylinder (1D) lower extreme has locating hole (1E) that the diameter is greater than central diameter, open in the centre bore have with hank pedestal (3) screw hole (1F) that the screw thread links to each other.

3. The medium speed pulverizer grinding roller apparatus of claim 1, characterized in that: the roller frame (4) comprises hinge shaft fixing lugs (4A) symmetrically arranged on one side face of the upper edge of the roller frame, a roller shaft hole (4B) is formed in the lower portion of the roller frame, pressing plate fixing bosses (4C) are arranged at the hole openings of the roller shaft hole (4B), and sealing air inlets (4D) are symmetrically distributed on the upper side and the lower side or the left side and the right side of each pressing plate fixing boss (4C).

4. The medium speed pulverizer grinding roller apparatus of claim 1, characterized in that: one side of the big end surface of the roller core (11) is provided with a roller core boss (11A) buckled with the shaft sleeve (10).

5. The medium speed pulverizer grinding roller apparatus of claim 1, characterized in that: the right pressing plate (12) comprises a right pressing plate air guide hole (12A) located in the axis position of the surface of the pressing plate and a plurality of right pressing plate light holes (12B) evenly distributed around the right pressing plate air guide hole (12A), and the diameter of the right pressing plate air guide hole (12A) is equal to that of a right small round hole (13B) of the roll shaft (13).

6. The medium speed pulverizer grinding roller apparatus of claim 1, characterized in that: a plurality of right press plate holes (13A) corresponding to the hole positions of the right press plate unthreaded holes (12B) are uniformly distributed on the right end surface of the roll shaft (13); the axle center of the roll shaft (13) is a big, medium and small three-stage stepped hole from left to right, and the ratio of the diameter of a first-stage hole to the diameter of the shaft is 2: 3, the diameter is gradually decreased in an equal difference manner, the length-diameter ratio of the hole is less than 5 times, and a small hole on the right side of the three-stage stepped hole is tapped with threads; the outer edge of the roll shaft (13) is provided with two stages of bosses (13D), and a plurality of roll shaft small holes (13C) which are uniformly distributed in the radial direction are distributed on the bosses.

7. The medium speed pulverizer grinding roller apparatus of claim 1, characterized in that: the non-return sealing air short pipe (20) comprises two groups of non-return sealing air short pipe baffle plates (20B) and non-return sealing air short pipe suspension baffle plates (20C) which are arranged near an outlet on the right side in the non-return sealing air short pipe (20), the sealing air short pipe baffle plates (20B) are obliquely connected with the pipe wall, the non-return sealing air short pipe suspension baffle plates (20C) are parallel to the non-return sealing air short pipe baffle plates (20B), gaps are reserved between the non-return sealing air short pipe suspension baffle plates and the pipe wall, and the sum of the widest distances of the gaps on the two sides is equal to the spacing distance of the non-return sealing air short pipe suspension baffle plates (20C); the maximum distance between the baffle (20B) of the non-return sealing air short pipe and the baffle (20C) of the non-return sealing air short pipe hanging baffle is equal to the thickness of the baffle; the distance from the top of the reverse-stopping sealing air short pipe baffle (20C) to the right outlet of the reverse-stopping sealing air short pipe (20) is 1.5 times of the pipe diameter, and reverse-stopping sealing air short pipe external threads (20A) are tapped on two sides of the reverse-stopping sealing air short pipe (20).

8. The medium speed pulverizer grinding roller apparatus of claim 1, characterized in that: the shaft sleeve (21) comprises a large shaft sleeve round hole (21A) and a small shaft sleeve round hole (21B) which form a step type, the large shaft sleeve round hole (21A) is in interference fit with a boss (13D) on the roller shaft (13), the large shaft sleeve round hole (21A) is tangent to a roller shaft small hole (13C) on the roller shaft (13), and meanwhile, the small shaft sleeve round hole (21B) is in interference fit with the roller shaft (13); the outer side of the shaft sleeve (21) is provided with a shaft sleeve circular boss (21C).

9. The medium speed pulverizer grinding roller apparatus of claim 1, characterized in that: the transparent cover (22) is provided with a boss ring (22A) with a plurality of grooves near the axis, and the boss ring (22A) and a shaft sleeve ring boss (21C) distributed on the outer side of the shaft sleeve (21) are buckled to form a labyrinth seal structure.