JP2850526B2 - Vertical crusher - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vertical pulverizer for pulverizing raw materials such as limestone, blast furnace slag, and cement raw material by cooperation of a rotary table and a pulverizing roller. .

[Prior Art] As one type of crusher for finely pulverizing raw materials such as limestone, blast furnace slag, and cement raw material into powder, a vertical crusher having a rotary table and crushing rollers as shown in FIG. 1 is widely used. This type of crusher includes a disk-shaped rotary table 3A that is driven by a motor 2A by a speed reducer 2 and rotates at a low speed in a lower part of a cylindrical casing 1a, and a hydraulic pressure is applied to a portion that equally divides an outer peripheral portion of an upper surface thereof in a circumferential direction. And a plurality of crushing rollers 4 that are driven to rotate by being pressed by the like.

The crushing roller 4 is connected to a piston rod 10 of a hydraulic cylinder 9 via an arm 5 and an arm 7 which are swingably supported by a shaft 6 on a casing 1a. 4 is pressed onto the rotary table 3A to give a pulverizing pressure to the raw material. As shown in FIG. 5, a bearing 8a for supporting the shaft 6 and a bearing housing 8 for housing the bearing 8a are fixed to the upper surface of the gantry 20. 3B is a dam ring provided on the outer peripheral edge of the rotary table 3A to adjust the layer pressure of the raw material, 14 is an annular space passage around the rotary table 3A for gas blowing, 15 is a hot air blowing passage, 13
Is a rotary separator for classifying the raw material pulverized by the blades 13A, 16 is an outlet for taking out a product together with gas, and 17 is a raw material input chute.

In such a vertical crusher, the raw material supplied to the center of the rotary table 3A by the raw material charging chute 17 receives centrifugal force in the table radial direction due to the rotation of the rotary table 3A and slides on the rotary table 3A. The rotary table 3A receives a force in the rotation direction, and slides between the rotary table 3A and performs rotation somewhat slower than the rotation speed of the rotary table 3A.
The above two forces, that is, the forces in the radial direction and the rotational direction are combined, and the raw material moves on the turntable 3A to the outer periphery of the turntable 3A along a spiral trajectory. Since a roller is pressed against this outer peripheral portion and rotated, the raw material describing the spiral enters the grinding roller 4 and the rotary table 3A from a direction that forms an angle with the roller axis direction and bites. Rarely crushed.

On the other hand, air is applied to the base of the casing 1a by a duct,
Alternatively, gas such as hot air is introduced, and the gas is blown up from the annular space passage 14 between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing, so that the crushed fine powder is entrained by the gas. As a result, the product having a predetermined particle size is discharged from the outlet 16 together with the gas and sent to the next step.

[Problem to be solved by the invention] In the conventional vertical pulverizer as described above, for example,
When grinding blast furnace slag, etc., when blast furnace slag is mixed with moisture, the blast furnace slag has self-hardening properties, and when it enters the vertical crusher via the raw material input chute, the dry heat source flowing through the vertical crusher The hot air gas, which has been heated by the hot air gas, adheres and solidifies on the inner surface of the raw material charging chute, gradually develops and narrows or closes the passage in the chute, thereby impeding the smooth supply of the raw material.

The vertical pulverizer of the present invention is for removing the raw material adhering to the inner surface of such a raw material charging chute and keeping the inner surface in a clean state without stopping the operation of the pulverizer.

[Means for Solving the Problems] In order to solve the above-mentioned problems, a vertical pulverizer of the present invention comprises: In a vertical pulverizer for applying a predetermined pulverizing pressure to a pulverizing roller to pulverize a raw material supplied via a raw material charging chute hanging directly above and pulverizing between the upper surface of the rotary table and the peripheral surface of the pulverizing roller, A hollow eccentric rotating shaft rotatably rotatable concentrically within the raw material charging chute is provided to hang down the raw material charging chute horizontally in multiple stages on the eccentric rotary shaft. A rake having an opening at the tip is provided, and an electric motor for rotating the eccentric rotating shaft is provided. The rake is ejected from the leading end opening of the rake via the hollow portion of the eccentric rotating shaft and the hollow portion of each rake. You The compressed air inlet is provided at the upper end of the eccentric rotary shaft via a rotary joint.

[Operation] In the vertical pulverizer of the present invention, an eccentric rotary shaft in which rakes are arranged horizontally and in multiple stages is suspended from above in a raw material charging chute, and an electric motor for driving the eccentric rotary shaft is provided.
The rake sweeps and cleans along the inner surface of the raw material charging chute, and blows out the attached matter by blowing out compressed air from the tip of the rake. Therefore, the inner surface of the chute can be kept clean at all times, and a smooth raw material supply is ensured.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 3 relate to an embodiment of the present invention. FIG. 1 is an overall vertical sectional view of a vertical grinding machine, FIG. 2 is a partially enlarged vertical sectional view of an eccentric rotary shaft and a rake, and FIG. It is a principal part enlarged longitudinal sectional view of a rotary joint.

In the figure, 1 is a vertical pulverizer, 2 is a speed reducer, 2A is an electric motor, 3A is a rotary table, 3B is a dam ring, 4 is a pulverizing roller, 5 is an arm, 6 is a shaft, 7 is an arm, and 8 is a bearing housing. , 8a is a bearing, 9 is a hydraulic cylinder, 10 is a piston rod, 13 is a separator, 13A is a separator blade, 14 is an annular space passage, 15 is a hot air blowing passage, 16 is a discharge port, and 17 is a material input chute. The structure and operation are as described in the prior art.

Reference numeral 100 denotes a cleaning device that removes deposits on the inner surface of the raw material charging chute and cleans the inner surface of the raw material chute. The cleaning device 100 hangs down on the axis from the upper portion of the raw material charging chute 17 and is eccentric with the eccentric rotary shaft 110 eccentrically. It is composed of a plurality of rakes 120 protruding in the radial direction in multiple stages in a horizontal direction on the rotating shaft 110 and an electric motor 130 as a rotating drive means of the eccentric rotating shaft 110. The rake 120 horizontally sweeps and cleans the inner surface of the raw material charging chute by the rotation of the electric motor 130.

Also, the eccentric rotation shaft 110 is formed from a hollow pipe,
The rake 120 connected to the rake 120 also has a hollow shape, and is provided with an opening 120a at the tip. The rake 120 is provided with a rotary joint 140 shown in FIG. Compressed air is injected through slit holes 110a provided at an equal pitch, and is ejected from the opening 120a to purge air adhered to the inner surface of the raw material charging chute.

As shown in FIG. 3, the rotary joint 140 includes a pair of upper and lower bearings 140a, 140a fitted on the eccentric rotary shaft 110, and a housing 140b covering both of them, and compressed air is supplied from an external air source. The eccentric rotary shaft 110 is guided into the rotary joint 140 and rotates through the slit hole 110a of the eccentric rotary shaft 110.
It reaches 0a and is ejected.

In addition, you may use a commercially available rotary joint other than the above-mentioned rotary joint.

The rake 120 may be a perforated hollow pipe or prism, as shown in FIG. Further, if a brush made of wire or plastic is provided so as to protrude in the radial direction from the periphery of the opening 120a at the tip, and the tip of the brush is brought into contact with the inner surface of the material charging chute 17, the cleaning effect is further improved.

With the above configuration, the cleaning device 100 of the present invention is continuously or intermittently operated for about 5 minutes every hour during the operation of the crusher 1, so that the deposits on the inner surface of the raw material charging chute 17 are obtained. The rake 120 automatically keeps the inner surface of the chute clean by a synergistic action of the shearing action along the inner surface of the chute of the rake 120 and the action of ejecting the compressed air from the opening 120a.

[Effect of the Invention] As described above, in the vertical pulverizer of the present invention, the cleaning device provided with a plurality of rakes that rotate along the inner surface of the raw material charging chute and eject compressed air from the tip is operated. Thereby, the deposits on the inner surface of the raw material charging chute can be automatically and easily peeled off. Therefore, the inner surface of the chute is kept clean, and a smooth raw material supply is ensured.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is an overall vertical sectional view of a vertical crusher, FIG. 2 is a partially enlarged vertical sectional view of an eccentric rotary shaft and a rake, and FIG. It is a principal part enlarged longitudinal sectional view of a rotary joint. 4 to 5 show a conventional embodiment, FIG. 4 is an overall vertical sectional view, and FIG. 5 is a side view as viewed in FIG. Reference Signs List 1 ... Vertical crusher, 2 ... Reducer, 3A ... Rotating table, 4 ... Pulverizing roller, 17 ... Material feeding chute, 100 ... Cleaning device, 110 ... Eccentric rotary shaft, 110a ... Slit Bore, 120… rake, 120a… opening, 130… electric motor, 140… rotating joint, 140a… bearing, 140b… housing.

Claims (1)

(57) [Claims] A plurality of rotatable crushing rollers are disposed on the upper surface of an outer peripheral portion of a rotary table, and a raw material supplied via a raw material charging chute hanging directly above a central portion of the rotary table is supplied to a crushing roller at a predetermined crushing pressure. Crushing between the upper surface of the rotary table and the peripheral surface of the crushing roller, the hollow eccentric rotary shaft rotatably rotatable concentrically into the raw material charging chute directly above the raw material charging chute. Provided
A rake for sweeping the inner surface of the raw material charging chute in multiple stages horizontally on the eccentric rotary shaft, and a rake having a hollow opening at a tip is provided, and a motor for rotating the eccentric rotary shaft is provided. An inlet for compressed air that is ejected from the leading end opening of the rake through the hollow portion of the eccentric rotary shaft and the hollow portion of each rake is provided at the upper end of the eccentric rotary shaft via a rotary joint. Vertical crusher.