JPH0560534U - Vertical mill - Google Patents

Abstract

(57) [Summary] [Purpose] The separation of coarse powder and fine powder is made possible without controlling the driving force and rotation speed of the motor, and the power consumption in the plant is reduced. [Configuration] A funnel-shaped reject chute 1 is provided at an upper position in a housing 3 in which a crushing table 4 is installed at a lower portion.
0 and a fixed chute 21 are provided. Fixed chute 21
A static classifier 22 for swirling the crushed raw material, which is lifted up through the outside of the chute 21, is provided at a position above. The static classifier 22 uses the swirling force of the primary air to separate the coarse powder and the fine powder. Coarse powder is flow path 2 of chute 21
1a, it returns to the crushing table 4 through the flow path 10b of the reject chute 10. Fine powder is primary air and housing 3
To be carried outside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vertical mill, which is a mill that grinds raw materials and separates them into coarse powder and fine powder and conveys the fine powder by primary air.

[0002]

[Prior Art]

 As shown in FIG. 2, a large vertical mill currently used has a crushing table 4 rotatably installed in a lower portion of a housing 3 supported by a mill support 2 on a floor 1 so that the floor 1 The grinding table 4 is rotated by the mill motor 6 via the speed reducer 5 installed above, and the raw material is ground by contacting the upper surface of the grinding table 4 and rotating by the rotation of the grinding table 4. The roller 7 is attached to the housing 3 via the pivot shaft 8 so as to be rotatable (tilted), and is pressed against the crushing table 4 applied to the roller 7 by the expansion and contraction operation of the roller pressure device 9 such as a fluid pressure cylinder. The load can be adjusted, and in the upper position in the housing, a rough funnel-shaped portion 10a through which coarse powder can also pass, and a channel through which classified coarse powder can flow 1 The reject chute 10 having b is arranged so that the coarse powder is dropped onto the crushing table 4 between itself and the guide chute 11 for the raw material arranged in the center, and the coarse powder is not passed. A rotary blade 13 having a conical cylindrical shape with blades arranged at intervals is fixed to the lower end of the raw material supply pipe 14 and is arranged above the reject chute 10, and the raw material supply pipe 14 is rotated by a motor 15. The rotary classifier 12 is designed to rotate the rotary blades 13 as a unit by means of the above, and the control board 16 is connected to the motor 15 to control the rotation speed of the motor 15 so that the coarse powder And the fine powder is forcibly classified, and the fine powder is secured. Reference numeral 17 is a fine powder distributor provided on the top of the housing 3, 18 is a cut damper, 19 is a rotary air port formed in the peripheral portion of the crushing table 4 so as to give a swirling flow to the primary air, and 20 is a housing 3 It is a primary air inlet opened at the lower end.

When the raw material is crushed by the conventional roller type vertical mill and fine powder is conveyed by primary air, the mill motor 6 is operated to rotate the crushing table 4, while the motor 15 drives the rotary classifier. When 12 is rotated and the raw material is supplied onto the crushing table 4 through the raw material supply pipe 14 and the guide chute 11, the raw material is crushed by the roller 7 which is rotated by following the rotation of the crushing table 4. The crushed raw material is moved in the outer peripheral direction of the crushing table 4, and is then lifted and conveyed by the primary air being blown up in a swirling flow from the rotary air port 19, and the reject chute 10 has a rough texture. After passing through the portion 10a, the rotary classifier 12 forcibly classifies the coarse powder and the fine powder. The coarse powder is returned to the crushing table 4 from the flow path 10b at the lower end of the reject chute 10, while the fine powder is conveyed from the inside of the rotary blade 13 to the intended place via the distributor 17 and the cut damper 18 by the primary air. Will be.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional vertical mill, the coarse powder and fine powder are classified by classifying the coarse powder and the fine powder lifted by the primary air by incorporating the rotary classifier 12 and controlling the rotation speed. Since the fine powder is ensured, the motor 15 for driving the rotary classifier 12 and the control panel 16 for controlling the rotation speed of the motor 15 are required, which increases the power of the station. And there is a problem of increasing the initial cost.

Therefore, the present invention is intended to solve the above-mentioned conventional problems by enabling classification of coarse powder and fine powder without driving a motor.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention rotatably installs a crushing table in the lower part of a housing, and crushes the raw material supplied from the upper side onto the crushing table and crushes it on the crushing table. Coarse powder and fine powder are raised in the housing by the swirling flow of primary air, and the coarse powder and fine powder are classified at a position above the housing.The classified fine powder is carried out by the primary air to the outside of the housing, and the classified coarse powder Is a vertical mill that is returned to the crushing table by a reject chute, and a funnel-shaped guide that guides the classified coarse powder downwards is placed above the funnel-shaped reject chute installed at the upper position of the housing. In the static position where the chute is fixed, and the coarse powder and fine powder floating outside the chute are swung inward in the upper direction of the funnel-shaped chute to classify the coarse powder and the fine powder. And installed configuration in which the classifier.

[0007]

[Action]

 The raw material crushed on the crushing table is lifted to the upper part of the housing by the swirling flow of the primary air blown upward from the lower part of the table, and is swirled from the outside to the inside by the static classifier. At this time, the swirling force separates coarse powder and fine powder, the coarse powder is dropped onto the crushing table along the funnel-shaped chute, and the fine powder is carried out by the primary air that escapes from the top of the housing.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. Like the conventional vertical mill shown in FIG. 2, a crushing table 4 is installed under a housing 3 and a decelerator 5 is used. The mill motor 6 makes it possible to rotate the power, and the roller 7 pressed against the upper surface of the crushing table 4 crushes the raw material, and the crushed raw material is blown up from the rotary air port 19 as a swirling flow of primary air. In the configuration in which the powder is conveyed by the above and can be classified into coarse powder and fine powder in the upper position of the housing 3, it is vertically disposed through the top of the housing 3 at the center of the upper position in the housing 3. With the lower end of the raw material supply pipe 14 positioned, coarse powder in the raw material that has been crushed on the crushing table 4 and conveyed by primary air can also pass through, and coarse powder 10a and classified coarse powder A funnel-shaped reject chute 10 having a flow path 10b formed between the raw material supply pipe 14 and the raw material supply pipe 14 is disposed between the inner wall of the housing 3 and the lower end portion of the raw material supply pipe 14. A funnel-shaped chute 21 is fixedly arranged on the reject chute 10 at a position above the reject chute 10, and the classified coarse powder is at the lower end of the chute 21 and the outer surface of the raw material supply pipe 14. And a crushing raw material that has been raised between the reject chute 10 and the chute 21 continuously at the upper end of the housing 3 inward and downward. The static classifier 22 that is curved so as to be swirled is fixed, and the static classifier 22 classifies the coarse powder and the fine powder by the turning force.

The fine powder classified by the static classifier 22 further swirls upward and is conveyed to a desired place from a distributor 17 installed at the top of the housing 3 through a cut damper 18. .. In the figure, the same parts as those in FIG. 2 are designated by the same reference numerals.

When the raw material is supplied onto the pulverizing table 4 through the raw material supply pipe 14 while the pulverizing table 4 is rotated by the mill motor 6, the raw material is pulverized between the roller 7 and the pulverizing table 4 which are under a predetermined load. To be done. When the crushed raw material reaches the periphery of the crushing table 4, it is raised by the swirling flow of the primary air blown up from the rotary air port 19 and further raised through the rough portion 10a of the reject chute 10. .. At this time, the coarse powder that cannot hit the outer surface of the chute 21 and is returned to the crushing table 4 through the flow path 10b, and the crushed raw material that has further moved up between the reject chute 10 and the short 21 is transferred to the static classifier 22. By being swirled with the primary air, it is classified into coarse powder and fine powder by the swirling force of the primary air, and the classified coarse powder falls through the flow passage 21a of the chute 21 and is returned to the crushing table 4. On the other hand, the classified fine powder is conveyed by the flow of the primary air toward the distributor 17, and is conveyed from the distributor 17 through the cut damper 18. The coarse powder returned to the pulverization table 4 is pulverized again here, raised by the primary air, and classified by the static classifier 22 into the coarse powder and the fine powder by the swirling force of the primary air.

[0012]

[Effect of the device]

 As described above, according to the vertical mill of the present invention, a funnel-shaped chute is also arranged above the funnel-shaped reject chute provided in the upper position in the housing, and the chute rises outside the chute. A stationary static classifier is installed to swirl the pulverized raw material and guide it inward.The static classifier separates coarse powder and fine powder using the swirling force of the primary air. The flow of the lower end and the flow of the lower end of the reject chute are returned to the lower grinding table, and the fine powder is conveyed to the outside of the housing by the primary air. It can be performed by using the swirling force of the primary air that swirls with no need for power, and thus the conventional rotary classifier and the motor that drives the rotary classifier can be eliminated. Make compact Preparative it is, savings house power is Hakare further control panel rotary classifier also becomes unnecessary, thereby also reducing the initial cost, an excellent effect like.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of a conventional vertical mill.

[Explanation of symbols]

 3 Housing 4 Grinding Table 5 Reducer 6 Mill Motor 7 Roller 10 Reject Chute 14 Raw Material Supply Pipe 19 Rotary Air Port 20 Primary Air Inlet 21 Chute 22 Static Classifier

Claims (1)

[Scope of utility model registration request] 1. A crushing table which is rotated by power from the outside is installed in the lower part of the housing, and the raw material crushed on the crushing table is conveyed upward in the housing by a swirling flow of primary air, thereby In a vertical mill that separates coarse powder and fine powder at the upper position, returns the coarse powder to the crushing table, and discharges the fine powder to the outside of the housing by primary air. A funnel-shaped chute is fixedly arranged above the reject chute, and a flow path is formed between the lower end of the chute and the raw material supply pipe vertically arranged in the center, and The vertical mill is characterized in that a static classifier for swirling the crushed raw material, which can be raised outside the chute, inward is swung downward in the vertical position.