JP2001340779A - Vertical pulverizing machine for manufacturing aggregate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical pulverizing machine for manufacturing aggregates which keep the height of the pulverizing machine low and enable smooth feeding and taking out of the pulverized matter. SOLUTION: This vertical type pulverizing machine 1 for manufacturing the aggregate has a turntable 3 which rotates around a vertical axis T and plural freely rotatable pulverizing rollers 4 which are arranged atop the outer peripheral part of the turntable 3 and is constituted to pulverize the raw materials supplied atop the approximately central part of the turntable 3 between the top surface of the turntable 3 and the peripheral surfaces of the pulverizing rollers 4 by applying prescribed pulverizing pressure to the pulverizing rollers 4 to drop substantially the entire amount of the pulverized matter subjected to the pulverizing from the outer periphery of the turntable 3 and to take the pulverized matter outside. An approximately toric pulverized matte receiving hopper 12 having a pulverized matter take-out port 12a is disposed below the outer periphery of the turntable 3 and a pulverized matter force discharging device, such as a vibration feeder 15, is mounted to be connected to the pulverized matter take-out port 12a. The installation angle θ of the pulverized matter transporting surface of the vibration feeder 15 is set at 10 to 40 deg. with a horizontal line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aggregate for producing fine aggregate such as crushed sand or aggregate such as coarse aggregate used for crushing a rough stone such as hard sandstone, for example, used as an aggregate for concrete. To a vertical pulverizer.

[0002]

2. Description of the Related Art In recent years, as a crusher for producing aggregate, a vertical crusher (sometimes called a vertical roller mill) has been used in place of a conventional crusher such as a cone crusher. Came. This vertical crusher includes a rotary table that rotates around a vertical axis, and a plurality of rotatable crushing rollers disposed on an upper surface of an outer peripheral portion of the rotary table. (Raw material) is crushed or crushed by applying a predetermined crushing pressure to the crushing roller so as to bite between the upper surface of the rotary table and the peripheral surface of the crushing roller,
Substantially all of the pulverized material is dropped from the outer periphery of the rotary table and taken out.

[0003] When the ore is crushed by such a vertical crusher, the crushing roller and the rotary table in the width direction of the crushing roller and the rotating table are not crushed by compression or impact by the conventional rotary crusher such as the above-mentioned cone crusher. The grinding (grinding) action by the shearing action due to the difference in peripheral speed works effectively, and the aggregated particles of the product to be produced are rounded with rounded corners, that is, compared with the rotary type crusher. Good shapes can be obtained, and products with flat shapes or sharp corners can be reduced.

In such a vertical pulverizer for producing aggregates, substantially all of the pulverized or crushed pulverized material is dropped downward from the outer periphery of the rotary table and disposed below the outer peripheral portion of the rotary table. A scraper which is received in a substantially annular pulverized material receiving hopper in plan view, and the pulverized material received in the pulverized material receiving hopper is attached to a rotary table and is rotated in the pulverized material receiving hopper integrally with the rotary table. For example, a belt conveyor or the like installed outside the crusher is carried out to a crushed material outlet position, taken out of the crusher through a cylindrical discharge chute having a rectangular cross section, for example, having a rectangular cross section and connected to the crushed material outlet at a predetermined angle. It is sent to the next step, for example, a sieve device by a transport machine.

[0005]

When the pulverized material is taken out of the pulverizer by the cylindrical discharge chute, the pulverized material is dropped in the discharge chute by gravity to be taken out. The aggregate contains a predetermined amount of fine particles (for example, when producing fine aggregate such as crushed sand having a particle size of 5 mm or less, fine particles having a particle size of 0.6 mm or less When producing coarse aggregate having a particle size of 20 mm or less and 5 mm or more, the particle size is 1 mm.
The following fine particles are contained in an amount of 22 to 23%). Further, in the case where the pulverized material contains water, the fine particles adhere to and accumulate on the inner wall of the discharge chute, and a smooth pulverized material pulverizer. Emission to the outside becomes impossible.

On the other hand, in order to prevent such fine particles from adhering to the inner wall of the discharge chute and to allow the crushed material to fall smoothly,
The inclination of the discharge chute is raised as much as possible. For example, the angle formed by the discharge chute with respect to the horizontal line is set to 70 to 75 degrees to make the inclination steep. It is conceivable to prevent the adherence of the particles. However, if the mounting angle of the discharge chute is set to a steep angle as described above, the discharge chute interferes with the strength member such as the lower frame of the crusher main body, and the opening of the discharge chute extends to the transporter outside the crusher. Inconvenience of disappearing occurs.

It is also conceivable that the height of the rotary table of the crusher is increased in order to increase the mounting angle of the discharge chute so that the height of the crushed material receiving hopper to which the discharge chute is connected is also increased. However, increasing the height of the rotary table not only increases the height of the crusher and the size of the crusher itself, which leads to an increase in weight, but also increases the height of the crusher and increases the point of action of the crushing force. As the height increases, the vibration of the crusher accompanying the crushing increases. For this reason, it is necessary to increase the rigidity of the pulverizer, which leads to an increase in weight and an increase in the cost of the pulverizer.

Further, when the mounting angle of the discharge chute is made steep, the installation height of the transporter outside the crusher where the crushed material is transferred from the discharge chute needs to be considerably lower than the crusher installation surface. In addition, the installation work cost is increased and the installation space (volume) of the equipment is required much.

[0009] Even if the inclination angle of the discharge chute is set to 70 degrees or more as described above, depending on the type and properties of the raw material to be pulverized, for example, if there is a contaminant such as clay in the raw material, the inner wall of the discharge chute may be removed. The adhesion to the inner wall of the discharge chute increases, and the chute closes over time.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the vertical pulverizer for producing aggregate having the above-mentioned pulverized material discharge chute. An object of the present invention is to provide a vertical pulverizer for producing aggregates, which can eliminate the necessity and smoothly take out pulverized materials to the outside of the pulverizer.

[0011]

In order to achieve the above object, the vertical pulverizer for producing aggregate of the present invention has the following configuration.

(1) A rotary table that rotates around a vertical axis, and a plurality of rotatable crushing rollers disposed on the upper surface of the outer peripheral portion of the rotary table. A crushing roller is applied with a predetermined crushing pressure to crush between the upper surface of the rotary table and the peripheral surface of the crushing roller, and a substantially entire amount of the crushed material is dropped from the outer periphery of the rotary table and taken out to the outside. In the vertical mill for material production, the outer periphery of the rotary table, or
A substantially annular pulverized material receiving hopper having a pulverized material outlet at the lower portion of the outer peripheral portion is provided, and a forced pulverized material discharge device is attached to the pulverized material outlet.

(2) In the vertical pulverizer for producing aggregates of the above (1), the forcible discharge device for the pulverized material is a vibrating feeder, and the angle at which the pulverized material transporting surface of the vibrating feeder is set with respect to a horizontal line. The configuration was set to 10 to 40 degrees.

[0014]

In the vertical type pulverizer for producing aggregate having the above-mentioned constitution (1), almost all of the pulverized material pulverized or pulverized by the cooperation of the rotary table and the pulverizing roller is dropped from the outer periphery of the table, and the pulverized material receiving hopper is provided. It is accepted by. Then, the crushed material is transferred to a forced discharge device such as a vibration feeder through the crushed material outlet of the crushed material receiving hopper, and is forcibly led out of the crusher by the forced discharge device. Then, it is transferred from the forced discharge device to a transporting machine such as a belt conveyor installed on the side of the pulverizer and transported to the sieve device in the next process.

Since the pulverized material taken out of the pulverized material receiving hopper by the forcible discharge device is sent out of the pulverizer, the pulverized material contains water, and
Even if fine particles are contained, the forcible discharge device does not need to set the installation angle, that is, the inclination angle of the transport surface, as steep as a conventional discharge chute. And no need to increase the height of the rotary table of the crusher, or the installation height of a transfer device such as a belt conveyor for transfer installed outside the crusher. Thus, the pulverized material can be smoothly led out of the pulverizer without the need to reduce the pulverized material. Therefore, continuous operation of the pulverizer becomes possible, and it becomes possible to improve the pulverization efficiency.

In the present invention, examples of the forced discharge device include a vibration feeder (sometimes called an electromagnetic feeder), a table feeder, a chain feeder, and a belt conveyor. If a vibrating feeder is applied, vibrations and vibrations are given to the transport surface, and the transport surface itself is vibrated to transport the crushed material. Therefore, the adhesion of fine particles is naturally prevented and the adhesion is minimized, which is preferable.

In the configuration (2), since the forced discharge device is a vibratory feeder, the transport surface is vibrated, and the crushed material, which is the transported material, is sent by the vibrating action, so that the adhesion of fine particles and the like is prevented naturally. It is. Then, by adjusting the intensity of the vibration transmitted to the transport surface by the vibration device installed on the vibration feeder, the degree of adhesion of the fine particles and the transport amount can be easily adjusted. The angle of inclination of the transport surface is 10 to the horizontal.
By setting the angle in the range of 40 degrees, it is possible to prevent the height of the crusher from being affected. Further, it is not necessary to set the height of the transporting machine such as a belt conveyor on which the crushed material is transferred from the vibration feeder unnecessarily low.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vertical crusher for producing aggregates according to the present invention will be described below based on an embodiment shown in the drawings. FIG.
1 is a schematic overall longitudinal sectional front view of an embodiment of a vertical crusher for producing aggregate of the present invention, and is a sectional view taken along line BB of FIG. 2, and FIG. FIG.

1 and 2, a vertical crusher 1 for producing aggregate includes a lower casing 9 and a cylindrical upper casing 10 attached to an upper portion thereof. A disk-shaped rotary table 3 is mounted on the output shaft of the speed reducer 2 at the upper part of the speed reducer 2 so as to be rotatable at a low speed in a horizontal plane. Symbol T indicates a vertical rotation center axis of the rotary table. 3a is a table liner stuck on the upper surface of the rotary table 3. On the upper surface of the rotary table 3 (the upper surface of the table liner 3a), there are provided a plurality of crushing rollers 4 which are driven to rotate by being hydraulically pressed at locations where the outer peripheral portion is equally divided in the circumferential direction. In this embodiment, as shown in FIG. 2, three crushing rollers 4 are arranged at equal intervals in the circumferential direction.

The crushing roller 4 is fixed to a swing shaft 4a rotatably supported by a bearing 9a mounted on an upper portion of the lower casing 9, and an upper arm capable of swinging around the swing shaft 4a. 5 and a hydraulic cylinder 7 through a horizontal arm 6
And the hydraulic cylinder 7
, The grinding roller 4 is pressed (pressed) against the upper surface of the rotary table 3 to apply a grinding pressure to the raw material. Reference numeral 3b denotes a dam ring provided on the outer peripheral edge of the turntable 3 for adjusting and securing the thickness of the raw material layer. A raw material charging chute 11 is attached to the top plate 10a of the upper casing 10 so as to be positioned at the center of the turntable 3 so that the lower end opening thereof is opposed to just above the center of the turntable 3.

Reference numeral 12 denotes an annular section in a plan view attached to the lower casing 9 and disposed all around the lower part of the annular space on the outer periphery of the turntable 3 below the outer periphery of the turntable 3. A box-shaped crushed material receiving hopper has a slot-shaped crushed material outlet 12 at one location in the circumferential direction.
a is provided in an open state. The crushed material receiving hopper 1
A wear-resistant liner 12b is lined on the inner wall surface of No. 2. Reference numeral 13 denotes a scraper for discharging the crushed material, which is located in the crushed material receiving hopper 12 and is attached to the rotary table 3 and rotates integrally with the rotary table. In the present embodiment, six scrapers 13 are provided at equal intervals in the circumferential direction.

At the opening position of the pulverized material outlet 12a at the lower part of the pulverized material receiving hopper 12, a vibrating feeder 15, which is a device for forcibly discharging the pulverized material, connects the pulverized material receiving portion to the pulverized material outlet 12a. , The discharge end side is inclined downstream, and the transport surface 15 a is arranged to extend in the diametrical direction of the turntable 3.
Is a hanging bracket 15 in which two parts of the main body are interposed with a vibration absorbing member.
b to be supported and mounted by being suspended from the crusher body. In this embodiment, as shown in FIG. 1, the vibration feeder 15 is attached to the main body, that is, the transport surface 15a at an angle θ of 25 ° with respect to a horizontal line.
A vibration device 16 for the vibration feeder 15 induces vibration (excitation frequency) to give vibration to the main body of the vibration feeder 15, and is capable of adjusting the intensity of the induced vibration (excitation frequency). ing.

Below the discharge end of the vibration feeder 15,
A belt conveyor 17 is installed as a transport device for receiving the crushed material forcibly conveyed by the vibrating feeder 15 and sending the crushed material to the sieve device in the next process.

The operation of the thus-configured vertical crusher 1 for producing aggregate of the present embodiment will be described. Raw material (raw material) such as hard sandstone having a water content of about 10% and a size of 40 mm or less is supplied to the center of the turntable 3 through the raw material charging chute 11. The ore supplied to the center of the turntable 3 is spirally moved toward the outer peripheral side by the centrifugal force of the turntable 3 rotated around the vertical axis T driven by the electric motor (not shown) via the speed reducer 2. , Crushing roller 4
And crushed (crushed) into a size of about 20 mm or less.

The crushed (crushed) material climbs over the dam ring 3b, and almost all of the crushed material is dropped into the crushed material receiving hopper 12 in the lower part of the annular space on the outer periphery of the rotary table 3, and the rotary table 3
Scrapers 13 installed at equal intervals around the outside
The crushed material is sequentially moved to an outlet 12a, which is an opening of the hopper 12, and is taken into the vibrating feeder 15 through the outlet 12a.

The crushed material taken into the vibrating feeder 15 is sent in the inclined downstream direction by the vibration of the transport surface 15a of the vibrating feeder 15 itself, and is discharged from its discharge end to the belt conveyor 1.
Transferred to 7 The pulverized material is transferred to the belt conveyor 17.
Is transferred to a sieve device such as a mechanical vibrating sieve (not shown) and sieved by the sieve device. For example, when producing coarse aggregate having a particle size of 20 mm or less and 5 mm or more, a predetermined size, for example, 20 mm Particles having a larger particle size are returned to the vertical mill 1 and are ground again. The particles having a particle size smaller than the predetermined size pass through a sieve and are collected as a product. In the case of producing fine aggregate having a particle size of 5 mm or less, for example, crushed sand, a predetermined size, for example, 5 to 3.0 m
Particles having a particle size larger than m are returned to the vertical pulverizer 1 and pulverized again. The particles having a particle size smaller than the predetermined size pass through a sieve and are collected as a product (crushed sand).

In the vertical pulverizer 1 for producing aggregates according to the present embodiment, the means for taking out the pulverized material to the outside of the pulverizer is replaced with a conventional discharge chute by a forced discharge device as a vibrating feeder 15, and By forcibly transporting the object by the vibration of the transport surface 15a itself, even if the transported object contains fine powder and contains a large amount of water, for example, 10%, the inclination angle θ of the transport surface 15a is small. At a small angle (25 degrees in the present embodiment), the amount of adhesion to the transport surface 15a can be minimized and transport can be performed efficiently and smoothly. Therefore, the vertical height is not required as the pulverized material removing means unlike the conventional discharge chute.

Therefore, as compared with the case where a conventional discharge chute is provided, the abutment of the main body of the crusher 1 on the lower frame 9b and the like is eliminated, the position of the rotary table 3 of the crusher is increased, and the crusher itself is raised. In addition, there is no need to reduce the height of the installation position of the transfer belt conveyor 17 installed outside the crusher. Also, the vibration feeder 15
By adjusting the intensity of the vibration (excitation frequency) transmitted to the transport surface 15a by the excitation device 16 installed in the apparatus, the degree of adhesion of the fine particles and the transport amount can be easily adjusted. If the vibration of the transport surface 15a of the vibration feeder 15 is increased, that is, if the excitation frequency is increased, the vibration force is increased,
The amount of adhesion is reduced, and the amount of transportation can be increased. Therefore, it is possible to easily cope with a change in the pulverization amount of the pulverizer.

In the case where the pulverized product contains as much as 10% of water and a considerable amount of fine particles as in the present embodiment, using the conventional cylindrical discharge chute S as shown in FIG.
As shown by a chain line, it is necessary to set the inclination of the discharge chute S with respect to the horizontal line to be steep, for example, 70 degrees or more. It is necessary to further raise the position of the rotary table 3, that is, the position of the crushed material receiving hopper 12, to avoid the contact. However, this increases the height of the crusher more than necessary. Further, even if the contact with the lower frame 9b can be avoided, the installation position of the belt conveyor 17 must be considerably lowered.

In the present invention, the transport surface 1 of the vibration feeder 15
5a is preferably in the range of 10 to 40 degrees. If the angle is smaller than 10 degrees, the discharge of the crushed material due to the smooth movement in the inclined downward direction is not good. If the angle exceeds 40 degrees, the space occupied by the vibrating feeder 15 itself in the vertical direction (height) becomes unnecessarily large. In order to avoid contact with the machine body, the height of the rotary table (the height of the crushed material receiving hopper) must be increased, and the height of the belt conveyor 17 on which the crushed material of the vibration feeder is transferred is reduced. This must be lowered unnecessarily, which is not preferable.

In this embodiment, the case where the crushed material receiving hopper 12 is disposed below the outer peripheral portion of the rotary table 3 is shown. That is, the crushed material receiving hopper 12
And a forced discharge device such as the vibrating feeder 15 may be attached thereto.

In the present embodiment, the case where the crushed raw material (rough stone) is hard sandstone has been described. However, as the aggregate raw stone, other raw stones such as granite, andesite, serpentine, and basalt may be used. .

In the vertical pulverizer 1 for producing aggregates of the above embodiment, the case where the pulverizing roller 4 is a conical (conical) roller is shown, but in the present invention, the pulverizing roller 4 is a spherical (spherical) roller. Even if applicable. In addition, although the case where the number of the crushing rollers 4 is three is shown, the present invention can be applied to the case of two or four or more.

[0034]

As is apparent from the above description, the present invention has the following excellent effects. According to the configuration of claim 1, the pulverized material taken out of the pulverized material receiving hopper by the forcible discharge device is sent out of the pulverizer, so that the pulverized material contains moisture and contains fine particles. Alternatively, even if a sticky raw material such as clay is mixed, the forcible discharge device does not need to make the installation angle, that is, the inclination angle of the transport surface, as steep as the conventional discharge chute, and is small. It can be sent out reliably as an angle.

Therefore, the forcible discharge device does not come into contact with the lower frame or the like of the crusher main body, and it is not necessary to increase the height of the rotary table of the crusher, or it is installed outside the crusher. This eliminates the need to reduce the installation height of a transfer device such as a transfer belt conveyor, and allows the pulverized material to be smoothly guided out of the pulverizer. Therefore, continuous operation of the pulverizer becomes possible, and it becomes possible to improve the pulverization efficiency.

According to the second aspect of the present invention, since the forcible discharge device is a vibratory feeder, the transport surface is vibrated, and the crushed material, which is the transported material, is sent by the vibrating action, so that adhesion of fine particles and the like can be prevented naturally. it can. Also, by adjusting the vibration transmitted to the transport surface by the vibration device installed in the vibration feeder, that is, by adjusting the intensity of the vibration frequency, it is possible to easily adjust the degree of adhesion of the fine particles and the transport amount. it can. By setting the inclination angle of the transport surface in the range of 10 to 40 degrees with respect to the horizontal line, it is possible to prevent the height of the crusher from being affected. Further, it is not necessary to set the height of the transporting machine such as a belt conveyor on which the crushed material is transferred from the vibration feeder unnecessarily low.

[Brief description of the drawings]

FIG. 1 is a schematic overall longitudinal front view of an embodiment of a vertical crusher for producing aggregate of the present invention, and is a cross-sectional view taken along line BB of FIG. 2;

FIG. 2 is a plan view cut along arrows A to A in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical grinder for aggregate production 2 Reducer 3 Rotary table 4 Grinding roller T Rotary table vertical rotation center axis 5, 6 Swing arm 7 Hydraulic cylinder 11 Raw material input chute 12 Crushed material receiving hopper 12a Crushed material outlet 12b Lining Liner 13 Scraper for crushed material discharge 15 Vibration feeder (forced discharge device) 15a Transport surface 16 Vibration device θ Vibration feeder installation angle (transport surface mounting angle) 17 External transport device (belt conveyor)

Claims (2)

[Claims] 1. A rotary table that rotates around a vertical axis, and a plurality of rotatable crushing rollers disposed on an upper surface of an outer peripheral portion of the rotary table. Aggregate in which a predetermined crushing pressure is applied to the crushing roller to crush between the upper surface of the rotating table and the peripheral surface of the crushing roller, and substantially the entire amount of the crushed material is dropped from the outer periphery of the rotating table and taken out to the outside. In a vertical grinding machine for production, a substantially annular pulverized material receiving hopper having a pulverized material take-out port is provided on an outer peripheral portion of the rotary table, or a lower portion of the outer peripheral portion, and is connected to the pulverized material take-out port. A vertical crusher for producing aggregates, which is provided with a forced discharge device for crushed materials. 2. The crushed material discharging device is a vibrating feeder, and an angle of the crushed material transporting surface of the vibrating feeder is set to 10 to 40 degrees with respect to a horizontal line. Vertical crusher for aggregate production.