JPH0347542A - Vertical grinder - Google Patents

Abstract

PURPOSE:To make fine the particle size of a ground product by keeping the driving of a roller so as to overcome the grinding resistance between the roller and a turntable at the time of high load wherein the power of a table driving motor is a predetermined value or more. CONSTITUTION:A plurality of the rollers 14 arranged on the turntable 12 rotated by a table driving motor 19 are pressed to grind a material. A drive means 15 is provided by fastening the rollers 14 to one ends of the drive shafts 16 thereof and connecting hydraulic motors 30 to the other ends of said shafts 16. The drive means 15 is connected to the hydraulic circuit 51 for operating the drive means and a control circuit 60 applying high output to the motors 30 when the power of the table driving motor 19 detected by a detection circuit 56 is a predetermined value or more to drive the rollers 14 is provided to the hydraulic circuit 51. As a result, the grinding of a fine material is sufficiently advanced and the particle size of a ground product can be made markedly fine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vertical crusher, and particularly to a vertical crusher suitable for finely pulverizing materials.

[Conventional technology]

Conventionally, as this type of vertical crusher, for example, the
The one shown in Japanese Patent No.-43775 is known.

That is, as shown in FIG. 3, a plurality of rollers 2 are arranged on a rotary table 1 rotated by a table drive motor.
A compressive force is applied on the rotary table 1 by the pressurizing device 10, and the material is supplied onto the rotary table 1. As the rotary table 1 rotates, the roller 2 is rotated, and the material is supplied onto the rotary table 1. and the rollers 2, the material is crushed while being subjected to compressive force, shearing force, or frictional force.

(Problems to be Solved by the Invention) However, the conventional vertical crusher described above has the following technical problems.

(1) The fine material becomes highly compacted due to the compressive force between the rotary table and the rollers that transfer along with it, which significantly increases the resistance to roller transfer and prevents the rollers from rotating. Only the table rotates, and fine materials are discharged without progressing to pulverization, and the table drive motor frequently trips, making it difficult to continue stable operation.

(2) It has been proposed to drive the rollers together with the rotary table by motors, but since multiple drive sources are formed, for example, in 3 to 4 locations, it is difficult to periodize these rotations, and it is difficult to specify There is a problem that only the drive source of the motor is overloaded.

The present invention solves these conventional problems,
When grinding fine materials, the rotation of the rollers is blocked and only the rotary table rotates.
A vertical type that is capable of sufficiently progressing the grinding of fine materials by sensing the load condition during material grinding and driving the floss rollers using a drive means, thereby making the particle size of the crushed product extremely fine. The purpose is to provide a crusher.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a vertical crusher that pressurizes a plurality of rollers disposed on a rotary table rotated by a table drive motor to crush materials, in which the rollers are placed at the ends of the drive shafts of the rollers. and a drive means connected to a hydraulic motor at the other end, the drive means is connected to a hydraulic circuit for operating the drive means, and the hydraulic circuit has a table drive motor power detected by a detection circuit. A control circuit is provided for applying high output to the hydraulic motor to drive the roller when the table drive motor power is equal to or higher than a predetermined power.

[Effect]

The present invention has the following effects due to the above configuration. In other words, when fine materials are crushed under pressure between the rotary table and the rollers that rotate, the fine materials become highly compacted due to the compressive force, resulting in resistance to the rotation of the rollers. When the detected table drive motor power exceeds a predetermined power, the hydraulic motor is controlled to provide high output to overcome the resistance in the rollers and maintain the drive. The pulverization of the material can be sufficiently progressed to make the particle size of the pulverized product extremely fine. Furthermore, since the rotary table and the rollers can be operated with a speed difference, it is possible to reduce the crushing power and produce fine particles.

〔Example〕

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

In FIG. 1, numeral 10 indicates a vertical crusher, in which a crushing section 11 and a classifying section 13 are formed within a casing 40. The crushing unit 11 includes a rotary table 12 that rotates on a horizontal plane by a reducer 18 connected to a table drive motor 19.
and a plurality of rollers 14 arranged on a rotary table 12, and the rollers 14 apply pressure to the material on the rotary table 12 by means of a pressure means 28 or the like. The roller 14 is fastened to one end of a drive shaft 16, and the other end of the drive shaft 16 is provided with a drive means 15 connected to a hydraulic motor 30.

The drive shaft 16 is housed in a bearing box 20 via bearings 22, 22, and the bearing box 20 is attached to one end of the casing 4Q. Reference numeral 24 indicates a support shaft, and the arm member 26 is attached to the bearing box 20 at one end with the support shaft 24 as the center, and the other end is connected to the pressurizing means 28. Reference numeral 34 indicates a supply pipe provided directly above the center of the rotary table 12. Material is supplied from the upper end 38 of the supply pipe 34, passes through the supply pipe 34, and descends onto the rotary table 12 from the lower end 37. , roller 1
4 and the rotary table 12. Reference numeral 15 indicates an air supply port through which air, etc. is introduced and the rotary table 12
The crushed material is ejected at high speed from the fume ring 17 located on the outer periphery of the casing 40, and the crushed material is sufficiently dispersed and becomes a crusher between the roller 14 and the rotary table 12, and is driven upward within the casing 40. Ru. Near the top of the casing 40 is a first
A classification section 12 is provided, and a second classification section 46 is provided inside the first classification section 42 . First classification section 42
is formed by variable fixed blades arranged at equal intervals in the circumferential direction, and the second classification section 46 is formed by the supply pipe 3.
4, and the rotating blade is rotated by a transmission means 36 provided at the upper part of the supply pipe 34. Reference numeral 50 designates a discharge port provided at the outlet of the second classification section 46 in the upper part of the casing 40, through which the crushed products are discharged together with the air flow.

The rotary table 12 is rotated by the drive of the table drive motor 19, and as the rotary table 12 rotates, the roller 14 is rotated, and at the same time, the hydraulic motor 30 connected to the drive shaft 16 rotates at a low output at the same time as the rotary table 12. It is driven in the direction.

Material is supplied from the upper end 38 of the supply tube 34 and from the lower end 39
From there, it descends onto the rotary table 12, where a pulverizing action is performed between the rollers 14 and the rotary table 12, resulting in a pulverized product and its particle size being refined. The pulverized product rises inside the casing 40 together with the air blown out from the blow ring 17 and passes through the first
When passing through the classification section 42, a classification action is performed and the particles are classified into coarse grains and intermediate grains, and the coarse grains descend along the inner wall of the partition plate 48 provided at the lower end of the variable fixed blade and return to the classified state from the tip part 49. The pulverized material is again lowered onto the rotary table 12 together with the material, and the pulverizing action is performed, causing the pulverized product to move upward in a circular manner.

The above-mentioned intermediate grains are subsequently subjected to a classification action when passing through the second classification section 46, and are classified into intermediate aggregate grains and fine grains, and the intermediate coarse grains are distributed along the inner wall of the partition body 48 together with the above-mentioned coarse grains. It descends from the tip and descends again onto the rotary table 12 together with the material as a classified return material, where a pulverizing action is performed and the pulverized product is circulated upwardly. The above-mentioned fine particles are discharged as a crushed product from the discharge port 50 along with the airflow.

The operation of the hydraulic circuit of the drive means will be explained with reference to FIG.

The hydraulic circuit 51 is connected to the drive means 15 and the hydraulic pump 5
2. For example, pressure oil is generated by a variable displacement pump to operate the hydraulic motor 30. Table drive motor 1
9 is connected by a conducting wire 55, and the power of this table drive motor 19 is detected by a detection circuit 5δ. Reference numeral 58 indicates a controller of the control circuit 60, and reference numeral 59 indicates a setting device for the power of the table drive motor 19, which is set to a predetermined power. The detection signal 57 from the detection circuit 56 is input to the controller 58. A control signal 61 of the controller 58 is converted into a signal by a converter 62, and the pilot motor 54 is operated to adjust the flow rate while the hydraulic pump 52 is in operation.

When the rotary table 12 and the rollers 14 are rotated at different speeds to crush fine materials,
Increased resistance to crushing causes table drive motor 19
The controller 58 detects that the power is higher than the predetermined power set by the setting device 59 based on the detection signal 57 from the detection circuit 56.
The control signal 61 operates the pilot motor 54 via the converter 62, adjusts the inclination angle of the hydraulic pump 52, increases the discharge flow rate, gives high output to the hydraulic motor 30, and stabilizes the load. is being measured. When the power of the table drive motor 19 is greater than the predetermined power,
Similarly, the pilot motor 54 is operated in reverse to adjust the inclination angle of the hydraulic pump 52 to reduce the discharge flow rate, and the hydraulic motor 30 is rotated with a predetermined speed difference to continue stably crushing the fine material. is possible.

It goes without saying that the present invention is not limited to the above-mentioned embodiments, and that various modifications can be made to the hydraulic circuit, drive means, etc. without departing from the gist of the present invention.

〔Effect of the invention〕

As is clear from the above embodiments, the present invention is applicable to crushing fine materials when the table drive motor is under high load, exceeding a predetermined power, by overcoming the crushing resistance between the rollers and the rotary table to drive the rollers. can be maintained, the pulverization of the fine material can proceed sufficiently, and the particle size of the pulverized product can be made extremely fine.

In addition, since the operating parameters can be easily set in the hydraulic circuit of the driving means, it is possible to easily adjust the particle size of the crushed product even when pulverizing various materials, and furthermore, the power of the hydraulic power source circuit can be saved. be able to.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing a vertical crusher according to an embodiment of the present invention, FIG. 2 is a hydraulic circuit diagram of the main parts of the same crusher, and FIG. 3 is an explanation showing an example of a conventional vertical crusher. It is a diagram. lO... Vertical crusher 12...
Rotary table 14...Roller 15
...... Drive means 16... Drive shaft
30...Hydraulic motor 19...Table drive motor 51...Hydraulic circuit 60...
... Control circuit Fig. 2 51... Hydraulic circuit ω... Control circuit Fig. 1 0 15... Drive means

Claims (1)

[Claims] (1) In a vertical crusher that crushes material by applying pressure to a plurality of rollers arranged on a rotary table rotated by a table drive motor, the rollers are fastened to one end of the drive shaft of the rollers, and the other end is A vertical crusher characterized by being equipped with a drive means connected to a hydraulic motor. (2) the drive means is connected to a hydraulic circuit that operates the drive means;
The hydraulic circuit includes a control circuit for applying high output to the hydraulic motor to drive the roller when the table drive motor power detected by the table drive motor power detection circuit is equal to or higher than a predetermined power. The vertical crusher according to claim 1, characterized in that: