JPH0152061B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary impact crushing apparatus and a method of impact crushing minerals configured to reduce the size of minerals removed from a mine or quarry or an alluvial deposit.

There are many types of machinery for crushing minerals and rocks, where producing minerals from the earth's crust usually involves a size reduction step between mining or quarrying and final preparation of the product. The present invention relates to an impact crushing device. The basic principle is that a rotor accelerates mineral particles against an impact surface.

It has been recognized that certain advantages may be obtained by locating an accelerating rotor or distributor horizontally and feeding such a distributor vertically and centrally to impact the circular line chamber. There is.

The present invention has particular applicability to the rotary impact crushing apparatus described in US Pat. No. 3,970,257. Typically, the rotor has two exit holes, which are protected by tungsten carbide chip plates.

In any mineral crushing device, it is desirable to improve the power output relative to the energy used. Additionally, it is desirable to have some degree of control over the fracture force in proportion to the properties of the particular material or mineral that is changing the grade and reducing the size of the product. For example, size, density, shape, roughness, viscosity, electrical or magnetic sensitivity are all relevant properties. It is also desirable in impact crushing equipment to have air flow characteristics that reduce dust emissions.

The present invention seeks to provide a rotary impact mineral crushing apparatus that improves output and increases efficiency without significantly increasing power requirements. The present invention also relates to controlling the movement of air inside a rotary impact crusher to reduce dust emissions.

A rotary impact crushing device according to the present invention includes: a casing; a vertical shaft having an inlet in the center and an acceleration passage around the periphery and horizontally providing a rotor that rotates within the casing; and a drive device that rotates the rotor. a first mineral feeder of the casing for providing a first flow of minerals to the inlet of the rotor; and a first mineral feeder of the casing for providing a first flow of minerals to the inlet of the rotor; a mineral holding shelf supporting a mineral locus forming a mineral surface in a direction in which a flow of minerals is accelerated by the rotor; an annular crushing chamber into which a first flow of minerals enters, the crushing chamber being formed by the mineral locusts supported on the shelf and the peripheral portion of the rotor; and an annular opening above the mineral locusts; a second stream within the casing that forms and directs a second flow of minerals to the top of the crushing chamber unimpeded by mineral surfaces;
a mineral feeder, wherein the first stream of accelerated minerals and the second stream of minerals undergo multiple collisions to reduce mineral particle size before passing through the annular mineral outlet.

Further, the mineral impact crushing method according to the present invention includes a step of forming a flow of minerals to be crushed that is accelerated by supplying a first mineral to an impact surface, and an impact before hitting the accelerated mineral against the impact surface. providing a slow second mineral supply substantially unimpeded along with the accelerated first mineral supply within the mineral bed retaining device; forming a mineral impact surface with a mineral bed retaining device; A device holds the mineral and the first
forming an impact zone, the impact surface being an outer boundary, between the accelerated mineral from the mineral supply and the mineral provided from the second mineral supply, the acceleration of the first mineral supply and the second mineral supply; The present invention is characterized by comprising a step of causing multiple collisions between the mineral particles and an impact surface of the accelerated mineral in the impact zone, and a step of discharging the minerals that have passed through the impact zone.

Therefore, since a mineral holding shelf is provided to support the mineral grass forming the mineral surface in the direction in which the first flow of accelerated minerals is applied, the mineral holding shelf is not worn or damaged by collisions of minerals. This can be prevented, and the mineral particle size can be effectively reduced by causing multiple collisions between the first stream of minerals and the second stream of minerals.

One preferred embodiment of the invention will now be described with reference to the accompanying drawings.

The device according to the invention has an introduction hopper 1 on an upper casing 2, which is removably connected to a lower casing 3 forming a mineral holding shelf. A rotor 4, for example a rotor as described in US Pat. No. 3,970,257, is rotatably mounted on the casing 3 and is driven by drive means 5, usually an electric motor or an internal combustion engine.

a first providing a first flow of minerals onto the rotor 4;
A supply pipe 6 , a peripheral supply plate 7 providing a second flow of minerals, a supply hopper 8 , a rotor supply control plate 8 and a control gate 10 are provided, all of which are located inside the upper casing 2 , forming a mineral supply device. It is supported by a fixed support 11.

A drop ring 12 is mounted on the underside of the peripheral feed plate 7 to prevent random material from reaching the top of the rotor. An air transfer vessel 13 is provided above the rotor at an angle towards the direction of air circulation and scoops air into the supply hopper 8, whereby air is drawn through the hopper 1 from outside the machine to the rotor. to prevent

In operation, feed material enters the inlet hopper 1 and falls onto the rotor feed control plate 9 where some of the material forms a ring batter around the control gate 10. Further material arriving from the inlet hopper 1 can pass continuously through a control gate 10, the opening of which is set so that sufficient material can fall through it into the rotor and utilize the power available from the drive means.

The material passing through the control gate 10 forms a small ring butterfly around the top of the feed tube 6 in the feed hopper 8. Other material falls under the feed tube 6 and enters the rotor, which is rotated by drive means to accelerate the material in a substantially horizontal direction and discharge it through holes in the peripheral wall of the rotor.

The ejected first material falls onto the floor of the lower casing 3 where it forms a main crushing droplet (mdin) of material.
breaking batter) 14 is set. When the flutter reaches a stable angle, further material discharged from the rotor falls around the flutter and from there falls into the discharge ring 15 and from there to the removal means, usually a belt conveyor.

When more material reaches the rotor supply plate 9 than can flow through the control gate 10, the excess passes through the outside of the ring batts to the rotor supply control plate 9.
descend along the edge of it falls continuously,
Forming a small flutter on the peripheral feed plate 7, the material that follows falls at low speed into the main crushing flutter 14 where it collides with the material accelerated by the rotor and ejected in a generally horizontal direction. Both the rotor feed and the ambient feed intersect in a number of collisions on the main crushing chopper and flow downwardly through the discharge ring to the removal means.

The rotor also accelerates the air so that there is a flow from the feed hopper 8 through the feed pipe 6 and the rotor 4 to the lower casing 3. Unless this air is directed back into the supply hopper, it will exit the machine and create a dust hazard. An air transfer line 13 is mounted to use the kinetic energy to rapidly rotate the air over the rotor and send it back to the supply hopper. In addition, an air supply is obtained from a direct connection to the inlet hopper 1 from an area of relatively high pressure close to the main crushing chopper 14, and air is introduced into the inlet hopper 8 through the control gate 10 from outside the machine through the hopper inlet. It flows without drawing out anything.

This construction allows the feed rate to the machine to be increased by direct flow to the environment without requiring additional power or rotor wear. As the ambient feed material collides with the accelerated material within the rotor, the material shrinks and improves its shape, increasing production at little additional cost. The power to final product ratio is thereby considerably improved.

The variant of FIG. 2 shows a single feed port 16, the division of the feed material being effected in the upper casing 2 by a radial screen which directs to the periphery particles above a size that can be received in the rotor. A screen provided by a series of concentric rings or tubes 17a may be used in place of the radial screen 17 if desired. Typically, this system is used in a diversion circuit so that oversized material that is not reduced in the first pass is recycled and processed again.

This equipment allows large size materials to be transferred to the rotor,
This process can be done without increasing the size or stress within the shaft or bearing, and at the same time increases production.

The modification shown in FIG. 3 has a rotor supply inlet 18,
An inlet 19 for ambient supply is shown. This division is done outside the machine by screens or other separating means suitable to the characteristics of the material to be divided. The feed is brought to the machine by conveyor or chute means. This equipment allows variations in classification and friction to achieve different fractures.

Using a split feed principle, and thus using the rotor as an acceleration means, the first feed material is accelerated and the second feed material is accelerated.
It should be understood that the present invention is applicable to any type of vertical spindle impact crusher and that these preferred embodiments for the particular rotor described are intended as examples only. .

It should further be noted that the casing can have any convenient cross-section and may be circular, square or polygonal. The flow of surrounding material may be continuous around the entire circumference of the rotor, or there may be several separate flows. The control gates used to regulate the flow to the rotor can be in any particular position, and in practice preferably include means such that both the flow to the rotor and the flow to the environment can be controlled.

The shape of the rotor supply control plate and peripheral supply plate is also circular,
It can be square, polygonal or scalloped.

The relative speeds of flow through the rotor and to the surrounding area may vary. However, for optimal operation,
The flow to the rotor must approximate the supply that can be conveniently handled by the power utilized to rotate the rotor, and a flow significantly in excess of this flow is usually provided to the surroundings. The expected ratio of ambient flow to rotor flow is between 1:1 and 4:1, but may be outside these predetermined ranges in some circumstances, and these ranges are not intended to be limiting. It is not meant to be a real thing, it is just for illustrative purposes.

In the figures, arrows with one bevel indicate the material path to the first or rotor, arrows with two bevels indicate the second material path, and arrows with three bevels indicate the circulating air path. It shows.

The results of the following tests demonstrate the improved effectiveness made possible using the present invention.

Test 1 A mineral crushing device approximately as shown in Figure 1 was operated with mineral flow through the rotor only. The flow rate through the rotor was 30 tons per hour. The production of -4.75 mm sand was 5 tons per hour. There was no sand in the stone supplied.

Test 2 The flow through the rotor was maintained at 30 tons per hour. The flow outside the rotor was 100 tons per hour, giving a total supply of 130 tons. −4.75 mm sand production per hour 18
It was a ton. There was no sand in the stones that were supplied again. The power consumption of Test 2 was approximately the same as that of Test 1.

A similar test was repeated with the feed in the second stream varied between 85 and 115 tons, and the material throughput through the rotor was maintained at 30 tons per hour.
The average production of mm diameter sand was 14 tons per hour.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a material crushing device according to the present invention;
FIG. 2 is a diagram showing a modification of the device shown in FIG. 1;
FIG. 3 is a diagram showing another modification of the invention shown in FIG. 1. 1: Introducing hopper, 2: Upper casing, 3:
lower casing, 4: rotor, 5: driving means,
6: Supply pipe, 7: Surrounding supply plate, 8: Supply hopper, 9: Rotor supply control plate, 10: Control gate.

Claims (1)

[Scope of Claims] 1. A casing, a vertical shaft having an inlet in the center and an acceleration passage around the periphery and horizontally providing a rotor that rotates within the casing; a drive device that rotates the rotor; a first mineral supply device of the casing for providing a first stream of minerals to the inlet of the rotor; and a first mineral supply device of the casing for providing a first stream of minerals to the inlet of the rotor; a mineral holding shelf supporting mineral locus forming a mineral plane in a given direction; an annular mineral outlet formed at the end of said shelf and at the periphery of said rotor; forming an annular crushing chamber with the mineral locus supported on the shelf and the peripheral portion of the rotor, and forming an annular opening above the mineral locus to accommodate a second stream of minerals; a second casing located within the casing that sends the
a mineral feeding device, wherein the first stream of accelerated minerals and the second stream of minerals undergo multiple collisions to reduce mineral particle size before passing through the annular mineral outlet. Impact crushing device. 2. The first mineral supply device includes a rotor supply control plate that controls the flow of minerals by providing the second flow of minerals into the crushing chamber through the second mineral supply device. The device according to claim 1, characterized in that: 3. The second aspect of the present invention further comprises a control gate cooperating with a hole passing through the rotor supply control plate to adjust the amount of minerals fed into the rotor.
Sectional equipment. 4. Claims 1 to 3, characterized in that a part of the first mineral supply device is a pipe and supplies minerals to the inlet of the rotor independently from the rotor supply control plate. Apparatus according to any one of the items. 5. Any one of claims 1 to 4, characterized in that a screen device located above the rotor distributes minerals of small size to the rotor and minerals of large size to the second stream. The device described in Section 1. 6. Apparatus according to any one of claims 1 to 5, characterized in that air transfer vanes above the rotor rapidly rotate air on the rotor back to the supply hopper. 7 forming a flow of minerals to be crushed accelerated by a first mineral supply to an impact surface; providing a substantially unimpeded supply of a second mineral at a low velocity; forming an impact surface of minerals by means of a mineral bed retention device;
forming an impact zone, the impact surface being an outer boundary, between the accelerated mineral from the mineral supply and the mineral provided from the second mineral supply, the acceleration of the first mineral supply and the second mineral supply; A method for impact crushing minerals, comprising: a step of causing multiple collisions between mineral particles and an impact surface of accelerated minerals in an impact zone; and a step of discharging the minerals that have passed through the impact zone. 8. The method of claim 7, including the step of controlling mineral particle size within said first and second streams. 9. Claim 8, characterized in that the first stream of minerals has small particles and the second stream of minerals has large particles as a grinding block against which the particles of the first stream are impinged. the method of. 10. The method of any one of claims 7 to 9, wherein the amount of mineral in the first stream is controlled with respect to the second stream. 11. Claim 7, characterized in that it has a path for directing the flow of air through the accelerated impact zone of the mineral to minimize the emission of dirty air.
The method according to any one of paragraphs 1 to 10. 12. The air within said accelerated impact zone is controlled using the kinetic energy of rapidly rotating air in conjunction with a mineral accelerator to direct the flow of air back into said first stream of accelerated minerals. 12. The method of claim 11, characterized in that: