JP2001113197A - Collision type supersonic jet crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crusher which is capable of uniformizing collision force and keeping the maximum collision force for a long time by giving a vertical movement to a crushing surface of a collision member with respect to a jet direction of jet stream in a crushing room of a collision type supersonic jet crusher and making the place on which the jet stream is directly collided movable in a direction approximately vertical to the jet stream. SOLUTION: This crusher is at least provided with a jet nozzle 23 which jets the jet stream (b) into a crushing room 22, a charging port 24 through which the object to be crushed is charged into the jet stream and a collision member 28 having the crushing surface which is disposed facing the jet nozzle and on which the object (a) to be crushed is directly collided together with the jet stream to be atomized. In addition, this collision type supersonic jet crusher gives the vertical movement to the crushing surface of the collision member 28 with respect to the jet direction of the jet stream and makes the place on which the jet stream is directly collided movable in a direction approximately vertical to the jet stream.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collision type supersonic jet pulverizer using a high pressure gas as a jet stream, and more particularly, to a collision type supersonic jet pulverization for pulverizing an object to be crushed into coarse particles into fine particles. About the machine.

[0002]

2. Description of the Related Art Conventionally, for example, in a dry type electrophotographic copying machine, a toner in which resin or the like is finely powdered is used as a developer.

[0003] Such a toner is also called a dry toner for an electrostatic charge image, which is obtained by melting and kneading a resin, a dye, a pigment and the like by a hot roll mill, cooling, and then coarsely pulverizing using a jaw crusher or the like. It is produced by pulverizing coarsely pulverized material with a supersonic jet pulverizer.

FIG. 5 shows an example of a supersonic jet pulverizer that pulverizes an object to be pulverized such as a resin into toner particles. Japanese Patent Application Laid-Open Nos. 58-143853, 51-100574, and 2-68 disclose a pulverizer in which the main parts of the pulverizer shown in FIG.
No. 155 and Japanese Patent Application Laid-Open No. 1-254266.

In FIG. 5, an object to be crushed (Ta), such as a coarsely crushed resin, is introduced from a material introduction side indicated by reference numeral (1), and is passed through a passage (2). (3)
Guided inside. Finely pulverized material (T
a) goes to the jet injection channel (5) via the passage (4).

On the other hand, high-pressure air is jetted from the nozzle (6) through the compressed air flow path, and a supersonic jet flow is generated in the jet flow path (5). A collision plate (7) is provided facing the nozzle (6) in the flow direction of the jet stream.

The material to be ground coming out of the passage (4) is guided to the jet stream, rides on the jet stream, and collides with the collision plate (7) while flying at high speed (ultra high speed). ,
Secondary impact on side (8).

The object to be crushed (Ta), which has become coarse particles, collides with the collision plate (7) at a supersonic speed, and then secondary collides with (8) to be pulverized into fine particles.

That is, the material to be ground (Ta) becomes a fine powder like a toner to be developed, and the fine powder (Tp)
From the crushing chamber (9) through the passage (10) and in the passage (2) together with the material to be crushed (Ta), the classification process chamber (3)
Sent to.

The material to be ground (T) sent to the classification process chamber (3)
a) and the fine powder (Tp), the latter fine powder (Tp) is collected as a product in the direction of the arrow, and the former crushed material (Tp) is recovered.
a) is again pulverized by the collision plate (7) through the passage (4) to the jet jet flow path (5) again.

As described above, the material to be pulverized is pulverized. Since the pulverization is performed by colliding the material to be crushed against the collision plate, this type of supersonic jet crusher is used in the collision type. It is called a supersonic jet crusher.

The pulverization of the object to be pulverized by such a jet pulverizer is performed by collision between particles sucked into the jet stream or by collision with a collision plate.

According to the manufacturing process described above, the fine powder is 1
The particles are classified and classified to a size of 00 μm or less, and then used. In this case, in order to meet the required quality such as toner particle size, yield value, (collected toner / input amount), the feed amount ( It is known that the supply amount), the pulverizing air pressure, the pulverizing air flow rate, the shape of the collision plate, and the shape of the secondary collision plate most affect the quality.

The impingement plate is arranged in a direction perpendicular to the direction of the jet flow, but the flat type impingement plate has the best pulverizability and a sharp classification effect can be obtained. Here, the pulverizing performance is a processing time for obtaining a toner having a constant particle size distribution.

On the other hand, conventional conventional crushing apparatuses can be roughly classified by crushing means: a) crushing by impact (for example, hammer mill, emperor breaker, etc.); b) crushing by grinding and compression (for example, C) crushing by compression (eg, jaw crusher, joy retrieving crusher), d) crushing by impact and grinding (eg, ball mill, rod mill, etc.) e) crushing by impact and shearing (eg, jet) Mill, jetmizer, etc.)

However, the selective use of these pulverizers is often governed by the pulverizing ability and pulverization efficiency, as well as the thermal characteristics of the material to be pulverized. For objects to be crushed such as resin powder and toner, heat and temperature rise due to a sharp increase in energy on the crushing surface during crushing, resulting in agglomeration and sticking of crushed particles, and crushing surface or powder contacting part In such a case, it is not possible to use a pulverizing device using means such as impact, grinding and compression, and in such a case, a cooled compressed gas or a low-temperature gas having a large cooling effect is used as a pulverizing medium. Therefore, a pulverizing apparatus using impact and shear, that is, a jet mill, a jet miser, and the like are applied.

Here, FIG. 3 shows a schematic configuration of a conventional jet-type pulverizer of this type, and FIG. 4 shows an embodiment of a collision member used in the pulverizer. In the configuration of the conventional example shown in FIG. 3, reference numeral (21) denotes a casing constituting the crushing device, and (22) denotes a crushing chamber formed in the casing (21). Also, (23)
Is an ejection nozzle opened at one end side in the pulverizing chamber (22) to generate a jet jet (b). A supply port (24) is formed on the side of the crushing chamber near the ejection nozzle (23) to supply the material to be crushed (a), and (28).
Is a jet nozzle (2) at the other end side in the crushing chamber (22).
A collision member, which is fixed to the fixing member (26) so as to face 3) and abuts the object (a) to be crushed supplied by the jet stream (b), (27) is a crushing chamber (22) An opening circuit is formed in the outer peripheral portion of the collision member (28) in the inside, and is a discharge circuit for taking the crushed object (a) into a collecting device (not shown). In the configuration of the prior art shown in FIG. 3, the collision member (28) has a disk-shaped crushing surface (28b) having an angle of 90 ° perpendicular to the jetting direction of the jet stream (b) as shown in FIG. )have.

Accordingly, the collision member (28) shown in FIG.
Is used, the object (a) to be crushed supplied from the supply port (24) into the crushing chamber (22) is contained in the jet jet (b) jetted from the jet inlet (23). All of them are directly in contact with the disk-shaped crushing surface (28b) at an angle orthogonal to the same jet direction (b) at the collision member (28) to be finely crushed.

[0019]

However, at present, there is a demand to produce a low-cost toner for the purpose of high-efficiency pulverization. The secondary collision at the secondary collision of the walls of the grinding chamber determines the grinding capability.

FIGS. 6 to 10 are cross-sectional views of various secondary collision plates along the line AB in FIG. 6 to 10
6, 7, and 8 are used for the cross-section AB shown by, and the shape shown in FIG. 8 is known as having the best crushing ability.

However, in the case of a large jet jet of 5 m ³ / min or more, the secondary collision plate is limited to the shape shown in FIG.

When the collision member (28) having the crushing surface shown in FIG. 4 is used, the blasting direction of the crushing surface (28b) is such that the maximum impact force can be obtained. Is made at an angle of 90 ° perpendicular to
In actual production of toner, the grinding surface (28b) is partially worn out due to the grinding action of the raw material toner as the material to be ground (a) and the grinding surface (28b) due to continuous operation for a long time.
There is a drawback that the angle of ° cannot be maintained and the processing capability of the apparatus itself is reduced.

Therefore, it has been desired to develop a pulverizer of this type which can continuously maintain the maximum impact force on the pulverized surface (28b) for particles having a particle size that requires pulverization for a long time.

An object of the present invention is to provide a collision type supersonic jet pulverizer in which the above problems are solved.

[0025]

According to the present invention, there is provided a collision type supersonic jet crusher, comprising: a jet nozzle for jetting a jet jet into a crushing chamber; a supply port for supplying an object to be crushed into the jet jet; A collision member having a pulverizing surface that is provided opposite to the nozzle and directly pulverizes the object to be pulverized together with the jet jet to pulverize the object to be pulverized, the pulverization of the impingement member with respect to the jetting direction of the jet jet. The surface is moved up and down so that the place where the jet jet directly abuts can be moved in a direction substantially perpendicular to the direction of the jet jet.

In the crusher of the present invention, it is preferable that the crushing surface of the collision member is attached to the fixed portion so as to be vertically movable. Further, it is preferable that the crushing surface of the collision member includes a collision plate, a base, and a fixed shaft.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional explanatory view showing a schematic configuration of a jet mill type pulverizing apparatus applied to the following example, and FIG. 2 is a cross-sectional view showing an aspect of a collision portion used in the above-described apparatus. In FIGS. 3 and 4, the same reference numerals as those in the conventional example shown in FIGS.

Example 1 In the structure shown in FIG. 1, reference numeral (21) denotes a casing constituting the crushing apparatus, (22) denotes a crushing chamber formed in the casing (21), and (23)
Is an ejection nozzle which is opened at one end side in the pulverizing chamber (22) to generate a jet jet (b), and (24) is a pulverizing chamber (2).
(2) a supply port which is opened at a side portion near the ejection nozzle (23) and supplies the object (a) to be crushed;
Is fixed to a fixing portion (26) so as to face the ejection nozzle (23) at the other end side in the grinding chamber (22), and crushes the object (a) supplied by the jet jet (b). A collision member serving as the essence of the present invention for causing the crushed object (a) to open to the side of the collision member in the crushing chamber (22) and crushing the crushed object (a) (not shown). This is a discharge passage for taking in the collecting device.

In the case of FIG. 1, a cover (29) shown in FIG. 2 is set in front of the collision plate (28a), and a long hole (30) is opened in the center thereof. Further, a base (31) to which a collision plate (28a) can be attached is set at the tip, and a fixed shaft (31a) is connected to the back surface of the base (31). Base (3
1) and the collision plate (28a) attached to the tip thereof can be moved up and down, and the collision plate (2) is kept at 90 degrees while the jet direction of the jet jet ejected from the ejection nozzle (23) is maintained at 90 degrees.
8a) can be moved.

In this case, 15 parts by weight of a polyester resin, 30 parts by weight of a magnetic material, 50 parts by weight of a styrene-acrylic resin, and 5 parts by weight of a dye were melt-kneaded by a hot roll mill, cooled and then coarsely kneaded by a jaw crusher. The pulverized material is used as a material. As a pulverizing device, a movable type shown in FIG. 1 and a fixed type shown in FIG. 3 are used, and a pulverizing pressure of 6.0 kg / cm ² is used as a jet jet (b). Table 1 below shows a comparison of the results when the object (a) was finely pulverized to 10 μm with compressed air of 10 m ³ / min in terms of product discharge.

[0031]

[Table 1]

[0032]

As is apparent from the above detailed and concrete description, the crusher of the present invention includes the object to be crushed supplied from the supply port into the crushing chamber in the jet jet jetted from the jet nozzle. The impact part that wears when it is crushed and crushed by the opposing impact member in a squeezed state is made uniform by moving it up and down in a direction substantially perpendicular to the direction of the jet jet, thereby maximizing the maximum impact force. Since the time can be maintained, there is an excellent effect that the durability of the crusher is significantly improved.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a main part showing an example of a crusher according to the present invention.

FIG. 2 is a side view showing an example of a collision section of the crusher shown in FIG.

FIG. 3 is a schematic explanatory view showing an example of a conventional pulverizer.

FIG. 4 is an explanatory view showing an aspect of a collision member of the crusher of FIG. 3;

FIG. 5 is a schematic explanatory view showing an example of a conventionally used supersonic jet crusher.

FIG. 6 is a diagram showing an example of a cross section of the secondary collision plate along the line AB in FIG. 5;

FIG. 7 is a view showing another example of the cross section of the secondary collision plate along the line AB in FIG. 5;

8 is a diagram showing another example of the cross section of the secondary collision plate along the line AB in FIG. 5;

FIG. 9 is a view showing another example of a cross section of the secondary collision plate along the line AB in FIG. 5;

FIG. 10 is a view showing another example of the cross section of the secondary collision plate along the line AB in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw material input side 2 Passage 3 Classification process chamber 4 Passage 5 Jet jet flow path 6 Nozzle 7 Collision plate 8 Secondary collision plate 9 Pulverization chamber 10 Passage 21 Casing 22 Pulverization chamber 23 Spray nozzle 24 Supply port 26 Fixing member 27 Discharge passage 28 Collision Member 28a Impact plate 28b Crush surface 29 Cover 30 Slot 31 Base 31a Fixed shaft Ta Pulverized object Tp Fine powder a Pulverized object b Jet jet

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiyuki Fukase 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company (72) Inventor Hiroyuki Yoshikawa 1-3-6 Nakamagome, Ota-ku, Tokyo Share Inside the company Ricoh

Claims (3)

[Claims] 1. A jet nozzle for jetting a jet jet into a pulverizing chamber, a supply port for supplying an object to be pulverized in the jet jet, and an object installed directly opposite the jet nozzle and directly abutting the object to be pulverized together with the jet jet. And a collision member having a crushing surface having a crushing surface for finely crushing the crushed surface. A collision type supersonic jet crusher characterized by being movable in a direction substantially perpendicular to the direction of the jet jet. 2. A collision type supersonic jet crusher according to claim 1, wherein a crushing surface of said collision member is vertically movably attached to a fixed portion. 3. The crushing supersonic jet crusher according to claim 1, wherein the crushing surface of the colliding member comprises a crushing plate, a base, and a fixed shaft.