JPH0629636U - Vertical mill - Google Patents

Abstract

(57) [Summary] [Structure] A reject chute 26 of the classifier 13 is rotatably supported by a bearing 18 provided concentrically with the supply tube 2 above the classifier 13 and loosely fitted onto the supply tube 2.
A hollow shaft 20 extending to the lower end opening of the hollow shaft 20.
A screw blade 21 spirally extending along the outer periphery of the hollow shaft 20 is fixed to the lower end of the hollow shaft 20, the drive device 23 is connected to the upper end of the hollow shaft 20, and the lower end opening of the reject chute 26 is connected to the outer periphery of the screw blade 21. To conform to. [Effect] The rotating screw blade 21 drops onto the reject chute 26 of the classifier 13 and accumulates the coarse powder 11
Is forcibly discharged and returned to the crushing table 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vertical mill.

[0002]

[Prior art]

 FIG. 2 is a cross-sectional view showing an outline of an example of a conventional vertical mill, which penetrates through the central portion of the classifier 13 connected to the crushing unit housing 1 and hangs down substantially vertically so that the inside of the crushing unit housing 1 is shown. The crushed material 3 introduced from the supply pipe 2 extending to the crushing section housing 1 is driven by the rotation driving device 4 provided at the lower part of the crushing section housing 1 to rotate around the upper surface of the crushing table 5. Crushing is performed between a crushing roller 9 which is supported by a pivot bracket 8 formed to rotate downward by a pressure reducing device 7 and is pressed against the table segment 6 and rotates following the crushing table 5; The fine powder 10 and the coarse powder 11 generated by the crushing action are swirling up while being dried by hot air blown out from an air port 12 formed in a tubular shape so as to surround the outer periphery of the crushing table 5. The fine powder 10 and the coarse powder 11 by the centrifugal force given by the classification vanes 14 provided on the inner surface of the outer periphery of the upper part of the classifier 13 and conveyed to the classifier 13 provided on the upper part of the crushing unit housing 1. The fine powder 10 is sent to the outside from a fine powder duct 15 provided at the top of the classifier 13, and the coarse powder 11 is provided in the lower part of the classifier 13 and is formed in a funnel shape so as to surround the supply pipe 2. By dropping it into the reject chute 17 with the damper 16 and opening / closing the damper 16 as appropriate, the coarse powder 11 stored in the reject chute 17 is discharged from the reject chute 17 and returned to the grinding table 5. is there.

[0003]

[Problems to be solved by the device]

 However, in the vertical mill described above, since the pressure in the crushing unit housing 1 is higher than the pressure in the reject chute 17 of the classifier 13, the opening and closing of the damper 16 of the reject chute 17 provided below the classifier 13 is performed. Since the operation may be hindered, the coarse powder 11 is excessively accumulated in the reject chute 17 of the classifier 13, and the coarse powder 11 is soared by the hot air blown from the classification vanes 14 and conveyed to the fine powder duct 15 direction. Alternatively, at the moment the damper 16 is opened, the hot air flowing backward from the tip of the reject chute 17 blows up the coarse powder 11 in the reject chute 17 toward the fine powder duct 15 and mixes it with the fine powder 10, resulting in a coarse product particle size. There was a problem that

In view of the above situation, the present invention provides a screw blade on the outer periphery of the supply pipe at the opening of the reject chute of the classifier, and by rotating the screw blade, coarse powder can be forcibly dropped. The purpose is to provide a mold mill.

[0005]

[Means for Solving the Problems]

 The present invention is directed to a crushing unit housing, a crushing table rotatably provided at a lower portion of the crushing unit housing, a crushing roller which is pressed against an upper surface of the crushing table and rotates following the crushing table, and the crushing table It is composed of an air port provided on the outer periphery, a classifier connected to the crushing unit housing, and a supply pipe penetrating through the center of the classifying unit and hanging in a substantially vertical direction and extending into the crushing unit housing. In a vertical mill, a bearing of the required diameter is installed above the center of the classifier concentrically with the supply pipe, and is rotatably supported by the bearing and fitted onto the supply pipe to classify from the upper part of the bearing. A hollow shaft extending to the lower end opening of the reject chute of the machine is provided, and a screw blade extending spirally at a predetermined pitch along the lower outer periphery of the hollow shaft is provided, and classification is performed. Of the lower end opening of the reject chute formed into a substantially cylindrical shape to match the outer circumference of the screw blade, and and the drive unit to the upper end of the hollow shaft and configured to have consolidated.

[0006]

[Action]

 Therefore, in the present invention, the coarse powder separated by the classifier and falling and deposited on the reject chute of the classifier is forcibly discharged by the rotating screw blade and returned onto the crushing table.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing the outline of a vertical mill of the present invention, and the same parts as those in FIG.

In the vertical mill of the present embodiment, a bearing housing 19 in which bearings 18 having a required diameter are arranged at predetermined intervals in the vertical direction is provided above the center of the classifier 13 and concentrically with the supply pipe 2. A hollow shaft 20 rotatably supported by the bearing housing 19 and loosely fitted to the supply pipe 2 and extending from the upper portion of the bearing housing 19 to the lower end opening of the reject chute 17 of the classifier 13 is provided. A screw blade 21 spirally extending along the outer circumference of the hollow shaft 20 with a predetermined pitch is fixedly installed in the lower portion of the hollow shaft 20.

The screw blade 21 is formed so as to maintain airtightness between it and an inner surface of a lower end opening of a reject chute 26 described later.

Further, a belt pulley 22 is externally fitted and fixed to an upper end portion of the hollow shaft 20 protruding above the bearing housing 19, and the belt pulley is connected to an output shaft of a drive device 23 provided on an upper surface of the classifier 13. A belt pulley 24 corresponding to 22 is fitted, a belt 25 is wound around the belt pulley 24 and the belt pulley 22, and a driving device 23 is operated to drive the hollow shaft 20 via the belt 25. 21 is formed so as to rotate in a predetermined direction.

Further, a funnel-shaped reject chute 26 is provided in the lower part of the classifier 13, and its lower end opening is formed in a substantially cylindrical shape so as to fit the outer circumference of the screw blade 21. Reference numeral 27 is a rectifying cone provided on the outer periphery of the intermediate portion of the hollow shaft 20 in order to promote the flow of the coarse powder 11.

Next, the operation will be described. The crushing material 3 charged into the crushing section housing 1 through the supply pipe 2 is rotated by being driven by the rotation driving device 4 provided in the lower part of the crushing section housing 1. 5 is supported by a table segment 6 formed in the circumferential direction of the upper surface of the No. 5 and a pivot bracket 8 formed so as to be rotated downward by a reduction device 7 and follows the grinding table 5 while being pressed against the table segment 6. The fine powder 10 and the coarse powder 11 are crushed between the crushing roller 9 and the rotating crushing roller 9. While being dried, it swings up and is guided to the classifier 13 provided on the upper part of the crushing unit housing 1, and inside the upper outer periphery of the classifier 13. The fine powder 10 and the coarse powder 11 are separated by the centrifugal force given by the classification vane 14 provided on the surface.

Then, the fine powder 10 is sent to the outside from the fine powder duct 15 provided at the top of the classifier 13, and the coarse powder 11 falls to the reject chute 26 below the classifier 13.

The coarse powder 11 that falls onto the reject chute 26 and accumulates in the lower opening is, together with the hollow shaft 20 that is rotationally driven by the drive device 23 via the belt 25, the screw blade 21 that rotates in a predetermined direction. Then, it is returned from the reject chute 26 onto the crushing table 5.

According to the above, since the screw blade 21 is provided at the lower end opening of the reject chute 26, there is an operational problem due to the pressure difference between the inside and outside of the reject chute 26 such as the damper 16 of the conventional example shown in FIG. It is possible to forcibly discharge the coarse powder that falls and accumulates in the reject chute 26 without being generated. As a result, it is possible to completely prevent the coarse powder from being mixed into the product, which enables efficient classification.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0018]

[Effect of device]

 According to the vertical mill of the present invention, the screw blade is provided at the lower end opening of the reject chute, so that the operation failure due to the pressure difference between the inside and outside of the reject chute does not occur, and the coarse particles that fall and accumulate in the reject chute are not generated. The powder can be forced out. As a result, it is possible to completely prevent the coarse powder from being mixed into the product, which enables efficient classification, and various excellent effects such as improvement in product particle size quality can be achieved.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing an embodiment of a vertical mill of the present invention.

FIG. 2 is a cross-sectional view schematically showing an example of a conventional vertical mill.

[Explanation of symbols]

 1 crushing unit housing 2 supply pipe 5 crushing table 9 crushing roller 12 airport 13 classifier 18 bearing 20 hollow shaft 21 screw blade 23 drive device 26 reject chute

Claims (1)

[Scope of utility model registration request] 1. A crushing unit housing, a crushing table rotatably provided at a lower portion of the crushing unit housing, a crushing roller that is pressed against an upper surface of the crushing table and rotates following the crushing table, and the crushing table. And an air port provided on the outer periphery of the crushing unit, a classifier connected to the crushing unit housing, and a supply pipe penetrating the central part of the classifying unit and hanging in a substantially vertical direction and extending into the crushing unit housing. In a vertical mill, a bearing with a required diameter is installed above the center of the classifier concentrically with the supply pipe, and is rotatably supported by the bearing and fitted onto the supply pipe to reject the classifier from the upper part of the bearing. A hollow shaft extending to the lower end opening of the chute is provided, and a screw blade extending spirally at a predetermined pitch along the outer periphery of the lower part of the hollow shaft is provided. A vertical mill in which a lower end opening of the reject chute is formed in a substantially cylindrical shape so as to fit the outer circumference of the screw blade, and a drive device is connected to an upper end of a hollow shaft.