JP3233394B2 - Crushing pin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a crushing pin for use in a crusher.

[0002]

2. Description of the Related Art A pulverizer is used for pulverizing a wide variety of raw materials, for example, glass raw materials, iron ore raw materials, foundry sand, building materials, building waste materials, waste materials, etc., and pulverizing and regenerating pavement waste materials. .

[0003] A crusher supports one or a plurality of rotor discs having a large number of crushing pins arranged in a casing,
An object to be crushed is charged into the casing while the rotor disk is rotated, and crushed.

[0004]

The conventional crusher has a poor crushing efficiency. In particular, the grinding efficiency was poor because the balance of the strength, durability and grinding performance of the grinding pins was poor.

[0005] An object of the present invention is to provide a grinding pin capable of improving the grinding efficiency.

[0006]

According to the present invention, there is provided a grinding pin for use in a grinding machine for grinding by rotating a rotor disk, wherein a metal member is fixed to the rotor disk and has a tapered portion. The member is cylindrical
And has a tapered through hole corresponding to the tapered portion of the metal member, the tapered portion of the metal member is fixed to the tapered through hole of the ceramic member, A protective ceramic member is fixed on the outside, and the base of the ceramic member has a small diameter.
It has a step shape, and there is a protective ceramic member there
A gap (M) is provided between the ceramic member for protection and the ceramic member for the crushing pin.
And the gap (M) is set with respect to the outer peripheral surface of the ceramic member.
From the gap extending in a direction parallel to the gap extending at right angles
The present invention provides a crushing pin characterized by the following.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A grinding machine using a grinding pin according to the present invention preferably supports a rotor disk in a casing, rotates the rotor disk, and performs grinding using the grinding pin.

[0008] The grinding pin according to the present invention is typically composed of a pin-shaped metal member and a cylindrical ceramic member. The metal member has a tapered portion, and the ceramic member has a tapered through hole corresponding to the tapered portion of the metal member. The tapered portion of the metal member is fixed to the tapered through hole of the ceramic member. The diameter (C) of the root portion of the tapered through hole of the ceramic member is 1.4 to 3.5 times the diameter (B) of the tip portion. The tapered portion of the metal member is fixed to the tapered through hole of the ceramic member, and a protective ceramic member is fixed outside the rotor disk. The protective ceramic member of the rotor disk and the ceramic of the crushing pin are fixed. The gap (M) with the member becomes substantially L-shaped in cross section.

[0009]

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

FIG. 1 is a longitudinal sectional view showing a crusher provided with a crushing pin of the present invention, and FIG. 2 is a transverse sectional view showing a crushing chamber. FIGS. 3 and 4 are perspective views showing the left and right portions of the crusher of FIG. Note that the left and right in the embodiment are for convenience and have no limiting meaning.

The crusher 10 has a base 11 on which a column 12 and a movable column 13 are formed. The columns and the movable columns 12 and 13 are provided with casings 14 and 15 forming a crushing chamber 18.

The movable column 13 can be translated along the longitudinal direction on the base 11 by a retractor (moving means) 16 provided at the right end of the base 11. The retractor 16 is configured to be operated by a retractor operation panel 61 provided on the column 13.

The retractor 16 can be constituted by using, for example, a cylinder / piston mechanism or a motor. Further, the base 11 is provided with a guide mechanism for parallel movement.

The crushing operation is performed by moving the movable column 13 as shown in FIG.
While moving to the left. At the time of maintenance, the movable column 13 is moved to the right and the pulverizing chamber 18 is opened.

A casing fixing member 17 is arranged on the outer periphery of the casings 14 and 15. During the crushing operation, the casings 14 and 15 are integrated by the fixing member 17. When moving the movable column 13 to the right,
The fixing member 17 is released.

An annular collision plate 19 which is opened in a tapered shape to the right is fixed inside the casing 14. The collision plate 19, together with the casings 14, 15, defines a crushing area.

In the grinding area, first and second rotor disks 21 and 22 are supported.

On the right surface of the first rotor disk 21, a metal pin 32 and a grinding pin 30 are fixed in a double circle.
The outer crushing pin 30 is of a cantilever type. The crushing pin 30 will be described later in detail. On the other hand, the inner metal pin 32 is a double-supported type, and the other end is fixed to the left surface of the disk 31.

The disk 31 is non-rotatably connected to one end of the shaft 23. Therefore, when the shaft 23 rotates, the disk 31 and the first rotor disk 21 also rotate together.

On the left side of the second rotor disk 22, a grinding pin 30 is fixed in a double circle. Crushing pin 30
Is a cantilever type similarly to the grinding pin 30 of the first rotor disk.

The crushing pins 30 of the first and second rotor disks 21 and 22 are alternately arranged as shown in FIG. 1, so that the crushing pins 30 of each rotor disk are aligned with a gap.

The second rotor disk 22 is non-rotatably connected to one end of a shaft 24.

The shafts 23 and 24 are the column and the movable column 1
2 and 13 are rotatably supported by bearings 25 and 26. The shafts 23 and 24 can be driven to rotate in opposite directions at desired speeds by drive motors 27 and 28, respectively.

The casing 14 is provided with an input port 33 for inputting an object to be ground such as a stone or gravel. The upper portion of the insertion port 33 is open upward, and the lower portion is open around the shaft 23 toward the left surface of the disk 31.

Near the center of the lowermost part of the crushing chamber 18, a product outlet 63 for collecting the product obtained by the crushing is provided. The product falls by gravity from between the collision plate 19 and the casing 15 and is collected.

An annular fine powder discharge port 34 is formed at the center on the right side of the crushing chamber 18. The inner periphery of the fine powder discharge port 34 is defined by a pressure loss reducing cover 38. The degree of opening of the fine powder discharge port 34 can be adjusted by a classification shivering plate 35 arranged in the casing 15. A fine powder recovery device may be connected to the fine powder discharge port 34.

A classifying air supply port 36 for sending air to the crushing chamber 18 is provided at the lower front side and the opposite side of the crushing chamber 18 (see FIGS. 1 and 3). A blower (blower) 70 for sending the classified air is connected to the classified air supply port 36.

Inside the classifying air inlet 36, a plate-shaped classifying air volume adjusting plate 37 for adjusting the air volume is rotatably arranged. The classifying air flow adjusting plate 37 adjusts the throttle of the classifying air flow path.

In a region further inside the classifying air volume adjusting plate 37, plate-shaped classifying air direction adjusting plates 39 are arranged in a row. The classification wind direction adjustment plate 39 is set to be rotatable,
This allows the classification wind direction to be adjusted appropriately.

On the left side of the casing 15, a large number of plate-shaped classification guide valves 71 are arranged in a circle. The classification guide valve 71 is configured to be fixed at a desired angle.

The left end face of the classifying guide valve 71 is located on substantially the same plane as the right face of the second rotor disk. The inner side of the classifying guide valve 71 is located substantially at the outer periphery of the second rotor disk (see FIGS. 1 and 2).

Between the second rotor disk and the casing 15, there is formed a classifying chamber 40 having an outer periphery defined by a classifying guide valve 71 and an inner periphery defined by a pressure loss reducing cover 38. The gap 42 between the adjacent classification guide valves 71 serves as an entrance of the classification chamber 40.

On the right side of the second rotor disk 22, a number of classifying blades 41 are arranged in a circle. Classification feather 41
Is a member having an L-shaped cross section. Classification blade 41 is in classification room 40
It has a function of rotating inside (with the second rotor disk 22) and excluding pulverized products having a predetermined particle size or more to the outside. Fine powder having a particle size smaller than the predetermined particle size can advance inside the rotation region of the classification blade 41.

The classification air introduced into the crushing chamber 18 is supplied to the inlet 4
2, flows into the classification chamber 40, flows in the direction of the central axis, and is discharged from the fine powder discharge port 34.

The crushing pin 30 will be specifically described with reference to FIGS.

The crushing pin 30 comprises a pin-shaped metal member 44 and a cylindrical ceramic (ceramic) member 43.

The metal member 44 includes a nut 54 and a spring washer 5.
5 fixes the rotor disk 22 in a cantilever manner. A protective ceramic member 49 is fixed outside the rotor disk 22.

The metal member 44 has a tapered shape as a whole,
The ceramic member 43 has a cylindrical shape having a corresponding through hole.

A rubber tape 51 and a rubber packing 53 are arranged between the metal member 44 and the ceramic member 43. By arranging the cushioning material in this way, stress concentration can be prevented, and the life of both members can be prolonged.

In the embodiment shown in FIG.
Is fixed to the metal member 44 by a mounting nut 45 and a washer-like pressing member 46.

In the embodiment shown in FIG. 7, the pressing member 47 has the same outer diameter as the ceramic member 47. Holding member 47
A rubber tape (rubber packing) 52 is provided between the ceramic member 43. In this embodiment, since the contact area of the holding member 47 is large, the mounting strength can be increased.

In the embodiment shown in FIG. 8, the joining surface of the pressing member 48 is concave, and the contact area with the ceramic member 43 is large. Therefore, the entire distal end portions of the ceramic member 43 and the metal member 44 are protected, and the mounting strength is increased.

Next, referring to FIG.
3 and the dimensions and shapes of the metal member 44 will be described.

In the through hole of the ceramic member 43, the diameter C at the root is 1.0 to 7.0 times the diameter B at the tip.
The reason for such a tapered shape is that, even in the case of the cantilever type, the metal member 44 supports the ceramic member 43 to ensure sufficient strength to withstand the crushing force, and to obtain a certain degree of crushing efficiency. That's why. A more preferred value is 1.4 to 3.5 times.

The outer peripheral shape of the ceramic member 43 is, for example, a cylindrical shape.
Is preferably 1/4 to 1/2 or 1/3 to 3/5 times the outer diameter A of the ceramic member 43. With such dimensions, sufficient strength of the ceramic member 43 and the metal member 44 can be ensured, and the balance between the strengths of the two can be made appropriate.

In each of FIGS. 6, 7 and 8,
As shown in the figure, the base of the ceramic member 43 is a small-diameter stepped portion, and the protection ceramic member 49 is provided adjacent thereto, and the space between the protection ceramic member 49 and the ceramic member 43 is provided. A gap M is provided,
The gap M is equal to the cylindrical outer peripheral surface of the ceramic member 43.
It consists of a gap extending in a direction perpendicular to the gap extending in the perpendicular direction .

Hereinafter, the operation of the crusher 10 will be briefly described.

Before the pulverization, if maintenance is necessary, the fixing member 17 is released, the retractor 16 is operated, and the movable column 13 is moved rightward in FIG. 1 to open the casings 14 and 15. . Then, maintenance is performed.

At this time, since the crushing pin 30 is of a cantilever type, it is possible to remove and replace only the broken crushing pin, which is extremely efficient.

When the maintenance is completed, the moving means 16
Is operated to move the movable column 13 to the left, and the casings 14 and 15 are united. Then, the casings 14 and 15 are firmly integrated by the fixing member 17.

Thereafter, the pulverizing operation is started.

By operating the motors 27 and 28, the first and second motors
The rotor disks 21 and 22 are rotated at predetermined speeds in opposite directions. In addition, the blower 70 is operated to send the classification wind from the classification wind inlet 36. Then, the non-pulverized material is supplied from the input port 33 in an appropriate amount.
The classifying air volume adjusting plate 37 and the classifying air direction adjusting plate 39 are set at desired angles in advance, and the flow rate and the direction of the classifying air are adjusted.

The material to be ground is supplied from the grinding chamber inlet 56 to the grinding chamber 1.
8 and is fed into the radially outer region so as to be involved in the rotation of the metal pin 32. In that area, the crushing pins 30 are arranged in a triple row and rotate in opposite directions. The object to be crushed is crushed in this region by the interaction of the three rows of crushing pins 30, and is rushed to the outer region.

The crushed material vigorously collides with the collision plate 19 on the outer periphery of the crushing area, and a part of the crushed material is further finely crushed. Since the collision plate 19 is opened to the right in a tapered shape, the pulverized material is entirely sent rightward.

By the way, the classification air sent into the crushing chamber 18 enters the classification chamber 40 from the inlet 42 and is discharged from the fine powder discharge port 34. Therefore, the relatively small crushed material is conveyed by the wind and sent from the inlet 42 into the classification chamber 40.

On the other hand, a relatively large crushed material not conveyed by the wind falls by gravity and is collected from the product discharge port 63.
Also, if the classifier 40 fails to enter the classifier 40 from the classifier inlet 42,
The pulverized material that did not enter is also dropped by gravity, and the product outlet 63
Recovered from.

In the classifying chamber 40, the classifying blades 41 are rotating. For this reason, among the pulverized products sent into the classifying chamber 40, those exceeding a predetermined particle size are obstructed by the classifying blades 41 and cannot enter inside from the rotation region thereof. Such pulverized material is blown off by the classifying blades 41, falls by gravity, and is collected from the product outlet 63 through the classifying chamber inlet 42.

The fine powder which has been sent to the classification chamber 40 and has advanced inside the rotation area of the classification blade 41 is discharged from the fine powder discharge port 34 by the classification wind.

Thus, the pulverized product collected from the product outlet 63 is a classified product without containing fine powder.
The degree of classification is adjusted by adjusting the classification style and using the classification guide valve 3.
9, the classification blade 41, the rotor disk (particularly, the second rotor disk 22), etc., can be appropriately controlled.

The present invention is not limited to the above embodiment. For example, the grinding pin attached to the rotor disk is 2
The number of rows is not limited to one, and may be one or three or more. The number of rotor disks is not limited to two, but may be one, or one may be fixed. Further, the classification air may be introduced into the pulverizing chamber (classification chamber) by reducing the pressure of the fine powder outlet side instead of blowing through the classification air intake.

Next, the characteristics of the pulverizing pin of the present invention will be clarified by describing experimental examples and comparative examples.

Experimental example Comparative example Example of the present invention Disk diameter 950 mm 1005 mm Pin length 75 mm 165 mm Number of pins 24 24 Pin diameter 35 mm 35 mm Capacity 10 t / h 25 t / h 5m / of limestone of 10-15m / m size
Shows the ability under milling conditions of m under 90%. In the case of this example, the specific gravity of the metal cantilever support pin is light (3.3 to 4.
3) Since a wear-resistant measure is taken by covering with a ceramic sleeve, there is no need to select a hard material (for example, 27% chromium cast iron) for the metal pin, and a highly tough material (for example, a structure such as S55C) Carbon steel) can be used. From this point, the pins can be made longer.

Further, the gap M has a special shape,
A gap extending at right angles to the outer peripheral surface of the lamic member
It has a shape consisting of gaps extending in parallel directions .

In the comparative example, since the wear is fast, the pin replacement is quick. For example, silica stone is 100 t and the comparative example needs to be replaced, while the example of the present invention can withstand 10,000 t use.

In the example of the present invention, the length is selected to be 165 m / m. However, if the rotation speed is 25 m / sec or less, the length can be naturally increased to 250 m / m.

As shown in Tables 1 and 2, it was found that by changing the angle of the wind direction adjusting plate, a wide classification point can be obtained regardless of the pulverization conditions, together with the adjustment of the air volume and pressure.

[0067]

[Table 1]

[0068]

[Table 2] In Tables 1 and 2, the crushed particle size is a value estimated from the fine powder particle size (actually measured value) and the coarse powder particle size (actually measured value).

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a crusher provided with a crushing pin of the present invention.

FIG. 2 is a cross-sectional view showing the grinding chamber of FIG.

FIG. 3 is a perspective view showing a left portion of the crusher of FIG. 1;

FIG. 4 is a perspective view showing a right side portion of the crusher of FIG. 1;

FIG. 5 is a cross-sectional view showing a ceramic member constituting the crushing pin of the present invention.

FIG. 6 is a sectional view showing one embodiment of a crushing pin of the present invention.

FIG. 7 is a sectional view showing another embodiment of the crushing pin of the present invention.

FIG. 8 is a sectional view showing still another embodiment of the crushing pin of the present invention.

[Explanation of symbols]

 14, 15 Casing 21, 22 Rotor disk 34 Fine powder discharge port 37 Classification air volume adjustment plate 39 Classification air direction adjustment plate 40 Classification room 70 Classification air supply means 71 Classification guide valve

Continued on the front page (72) Inventor Yoshihiko Imai 2-6-8 Nishitenma, Kita-ku, Osaka-shi Do Building Kansai Matex Co., Ltd. (72) Inventor Toshikatsu 2-6-8 Nishitenma, Kita-ku, Osaka Dodou Building Kansai Matek Inside the company (72) Inventor Hideki Nakamura 2-6-8 Nishitenma, Kita-ku, Osaka-shi Dosai Building Kansai Matex Corporation (72) Inventor Kazu 2-6-8 Nishitenma, Kita-ku, Osaka-shi Dosai Building (56) References JP-A-56-158152 (JP, A) JP-A-63-103743 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B02C 13/00-13 / 31

Claims (1)

(57) [Claims] 1. A grinding pin used in a grinding machine for grinding by rotating a rotor disk, wherein a metal member is fixed to the rotor disk and has a tapered portion, and a ceramic member has a cylindrical outer peripheral surface. Having
In addition, a tapered through hole corresponding to the tapered portion of the metal member is provided, and the tapered portion of the metal member is fixed to the tapered through hole of the ceramic member. ceramic member is fixed, Se
The root of the lamic member has a small diameter step shape,
There is a protective ceramic member adjacent to it.
A gap (M) is provided between the ceramic member for protection and the ceramic member of the crushing pin, and the gap (M)
Is a gap extending in a direction perpendicular to the outer peripheral surface of the ceramic member.
A grinding pin comprising a gap extending in a direction parallel to the gap .