JPH07136543A - Pulverizer - Google Patents

Abstract

PURPOSE:To provide a pulverizer with high pulverizing capacity by making flow of a material to be pulverized smooth in a supply part for material to be pulverized. CONSTITUTION:Flow of the material 10 to be pulverized is made smooth by providing an injection part 4 slant to an acceleration pipe outlet side 6b against an introducing part 3 vertical to the acceleration pipe 6, and a clogging phenomenon of the material to be pulverized in a supply pipe 2 of the material to be pulverized is decreased and also a speed of the material 10 to be pulverized in the acceleration pipe 6 is increased and impact when the material 10 to be pulverized comes into collision with a collision surface 9a is increased, thus fusion of the material 10 to be pulverized to the collision surface 9a is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crushing apparatus, and more particularly, to a structure of a crushed object supply section in a collision type crushing apparatus using a jet jet. It is suitable for use in.

[0002]

2. Description of the Related Art In a collision type pulverizer using a jet jet, an object to be pulverized is supplied into the jet jet, collides with a collision member together with the jet jet, and is crushed by the impact force at that time.

FIG. 8 is a view for explaining an example of a conventional crushing apparatus. In the figure, 21 is a crushed material supply port, 22 is a crushed material supply pipe, and 25 is a compressed air supply nozzle (spout nozzle). , 26 is an accelerating tube, 27 is a high-speed air flow (jet jet flow), 28 is a crushing chamber, 29 is a collision member, 30 is an object to be crushed, and 31 is a classifier.

In the crushing device shown in FIG. 8, a collision member 29 is provided so as to face the acceleration pipe outlet 26b of the acceleration pipe 26 to which the compressed air supply nozzle 25 is connected.
By the flow of 7, the crushed object 30 is sucked from the crushed object supply pipe 22 opened in the middle of the accelerating tube 26, is injected into the crushing chamber 28 together with the high-speed airflow 27, and collides with the collision surface 29a of the collision member 29. The object to be crushed is crushed by the impact at that time.

Usually, in order to grind the crushed object 30 into a desired particle size, a classifier 31 is provided after the crushing chamber outlet 28a, and the crushed object 30 is hung on the classifier 31 to obtain the desired particle size. Closed circuit crushing is formed in which crushed objects smaller than the diameter are collected, and crushed objects coarser than the desired particle size are sent again to the crushed object supply port 21 to perform crushing again, and crushed until the desired particle size is achieved. , Repeat the classification. Thereby, a finely pulverized product having a desired particle size is obtained.

In a collision type crusher using a jet jet as shown in FIG.
On the other hand, it is necessary to continuously and stably supply the crushed material 30 or to increase the collision energy when the crushed object 30 collides with the collision member 29 in order to improve the pulverization processing capacity. Therefore, by smoothing the flow of the crushed object 30 in the crushed object supply pipe 22, or by increasing the velocity in the flow direction of the high speed airflow 27 of the crushed object 30 when joining the high speed airflow 27, It is possible to improve the pulverization processing capacity.

[0007]

In the crushing apparatus shown in FIG. 8, as the crushed object supply pipe 22 is oriented in the flow direction of the high-speed air stream 27, the crushed object when the crushed object 30 joins with the high-speed air stream 27 is crushed. Although it is possible to increase the velocity of the high-speed air flow 27 of the object 30 in the flow direction, the object to be crushed within the object-to-be-ground 22 is crushed by the drag between the object 30 and the wall surface and the drag between the particles. The clogging phenomenon of the object 30 also easily occurs. On the other hand, as the pulverized material supply pipe 22 is made closer to the vertical with respect to the acceleration pipe 26, the pulverized material 30 becomes less susceptible to the influence of the drag force against the wall surface, so that the clogging phenomenon of the pulverized material 30 is suppressed and the high speed is achieved. Although it becomes possible to supply the crushed object 30 to the airflow 27 more smoothly, when the crushed object 30 merges with the high-speed airflow 27, the crushed object 30 has almost the velocity in the high-speed airflow direction. Therefore, the kinetic energy of the crushed object 30 cannot be expected to contribute to the collision energy.

As described above, the shape of the crushed object supply pipe 22 in the conventional crushing apparatus shown in FIG. 8 causes a clogging phenomenon of the crushed object 30 and further accelerates the crushed object supply tube 22. Due to the nearly vertical arrangement with respect to the pipe 26, the conveying speed of the crushed material 30 in the crushed material supply pipe 22 hardly contributes to the speed in the flow direction of the high-speed airflow 27 in the acceleration tube 26. Therefore, the crushed object 30 is not sufficiently accelerated in the acceleration tube 26, and when the crushed object 30 collides with the collision member 29, the contribution ratio of the kinetic energy of the crushed object 30 to the collision energy is low. And therefore,
The crushing ability is reduced.

The present invention has been made in view of the above circumstances, and prevents clogging of the material to be ground and smoothes the material to be ground by smoothing the flow of the material to be ground in the supply pipe for the material to be ground. The object of the present invention is to provide a crushing device having a high crushing capacity by effectively utilizing the kinetic energy of an object as energy for crushing the object to be crushed.

[0010]

In order to solve the above problems, the present invention provides (1) a jet nozzle for jetting a jet jet toward a crushing chamber, one end of which is connected to the tip of the jet nozzle and the other end of which is connected. An accelerating pipe opening to the crushing chamber; a supply pipe opening to the accelerating pipe to supply the object to be crushed into the jet jet; and the jet nozzle installed to face the jet nozzle. And a collision member having a crushing surface for finely crushing the powder, the supply pipe is provided with a vertical introduction part to which the object to be crushed is supplied, and one end is connected to the introduction part and the other end is provided. Comprises an injection part that is open to the acceleration pipe and is inclined in the jet jet direction, and (2) a first air supply port in which the injection part is opened to the injection part, Through the first air supply port A first air supply means for supplying air to the inlet part; and (3) a second air supply port opened by the injection part to the injection part, and the injection through the second air supply port. A second air supply means for supplying air to the section, and the second air supply port is arranged such that its central axis is parallel to the central axis of the injection section; and (4) ) The joining portion between the inner surface of the introducing portion and the inner surface of the injecting portion has a rounded shape, and (5) the joint portion between the inner surface of the injecting portion and the inner surface of the accelerating tube has a rounded shape. It is characterized by being attached.

[0011]

Function: Prevents clogging of the crushed material in the crushed material supply pipe, and further effectively utilizes the kinetic energy of the crushed material as energy for crushing the crushed object, and crushes the crushing device. Improve your ability.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram for explaining an embodiment of a crushing device according to the present invention, in which 1 is a pulverized material supply port,
Reference numeral 2 is a crushed material supply pipe, 3 is an introducing part, 4 is an injecting part, 5 is a jet nozzle, 6 is an accelerating pipe, 7 is a jet jet (high-speed airflow), 8 is a crushing chamber, 9 is a collision member, and 10 is a crushed member. Crushed material, 1
1 is a classifier. 2 is an enlarged view of the introducing part 3 and the injecting part 4 shown in FIG. 1, and parts having the same functions as in FIG.
The same reference numerals as in FIG. 1 are attached. FIG. 3 is a diagram for explaining the behavior of the object to be crushed 10 shown in FIG. 1, and in FIG.
Parts having the same functions as those in FIG. 2 are designated by the same reference numerals as those in FIGS.

In the crushing apparatus shown in FIG. 1, the crushed material supply pipe 2 is composed of a vertical introducing portion 3 and an inclined injecting portion 4, and the central axis 3a of the introducing portion 3 is an accelerating pipe. The injection portion 4 is arranged so as to be orthogonal to the central axis 6a, and the injection portion 4 is arranged such that an angle θ (shown in FIG. 2) formed between the central axis 4a and the central axis 6a of the acceleration tube is an acute angle. Is.

The crushed object 10 having a coarse particle size is conveyed in the Y direction toward the accelerating tube 6 and orthogonal to the accelerating tube 6 in the introduction part 3. The introduction part 3 has an inner diameter of 200 to 2000 μm
Is several hundred times more and has a straight shape in the vertical direction. Therefore, the arch due to the drag force by the wall surface and the drag force between the particles when the crushed object 10 is conveyed to the acceleration tube 6 by gravity, That is, the object to be crushed 10 is smoothly conveyed to the pouring section 4 without causing a clogging phenomenon.

The object to be crushed 10 has a combined velocity V of the velocity component Vg in the gravity direction and the velocity component Ve in the direction of the central axis 4a of the injection portion due to the ejector effect of the high-speed air flow 7 in the injection part 4, and further, When entering the accelerating pipe 6, the velocity component Vx of the velocity V in the direction of the central axis 6a of the accelerating pipe is accelerated by the high-speed airflow 7 toward the collision surface 9a with the initial velocity. The increase in the velocity Vx of the crushed object 10 contributes as energy when the crushed object 10 collides with the collision surface 9a, and contributes to preventing fusion between the crushed object 10 and the collision surface 9a.

Next, the result of crushing the object to be crushed will be described using the example shown in FIG. The raw materials shown in Table 1 below are mixed in a mixer, and the mixture is melt-kneaded at about 200 ° C. in an extruder, then cooled and solidified,
It was roughly crushed into particles of 200 to 2000 μm with a hammer mill (… treatment). This coarsely crushed material is referred to as the crushed material 10, and is shown in FIG.
The crushing was performed using the crushing device and the flow chart shown in FIG. As a means (classifier 11) for classifying the crushed pulverized product 10a into fine powder and coarse powder, a fixed wind power classifier was used.

[0017]

[Table 1]

The compressed air having a flow rate of 7 Nm ³ / min is introduced from the compressed gas supply nozzle (jet nozzle 5) of the collision type air flow crusher, and the crushed object 10 is constituted by the introduction part 3 and the injection part 4. It was supplied from the supply pipe 2 at a rate of 32 kg / hr. The crushed pulverized product 10a is placed on the classifier 11,
The finely pulverized material was recovered, and the coarsely pulverized material was again charged into the accelerating tube 6 together with the pulverized material 10 through the pulverized material supply port 1. As a result, 27.80 kg / hr of a pulverized product having a volume average particle size of 7.5 μm (measured by a Coulter counter) was recovered as a fine powder (yield 86.9%). Further, no fusion of the crushed object 10 on the collision surface 9a was observed even after continuous operation for 10 hours.

FIG. 4 is a view for explaining another embodiment of the crushing apparatus according to the present invention, in which 15 is an air supply port and 1
Reference numeral 6 is an air supply device, and other parts having the same functions as those in FIG. 1 are denoted by the same reference numerals as those in FIG. In the example shown in FIG. 4, in addition to the example shown in FIG. 1, air is supplied into the injection part 4 through the air supply port 15 that opens to the acceleration pipe outlet 6b side of the inner wall surface of the injection part 4 and the air supply port 15. An air supply device 16 for supplying is provided.

The object 10 to be crushed is conveyed to the injection section 4 by the same process as the example shown in FIG. At this time, the air supplied from the air supply device 16 is sent in the direction A (shown in FIG. 4) through the air supply port 15 to form voids between the objects 10 to be crushed in the injection part 4, whereby Therefore, it is possible to prevent the clogging phenomenon due to the increase in the particle concentration of the object to be crushed 10.

Next, the result of crushing the object to be crushed will be described with reference to the example shown in FIG. The raw materials shown in Table 1 were used, and the material obtained by the above treatment was used as the object to be crushed 10. The injection section 4 was the one shown in FIG. 4, and the other parts were the ones shown in FIG. The crushing was performed using a crushing device and a flow chart. A fixed wind power classifier was used as a means for classifying the crushed pulverized product 10a into fine powder and coarse powder.

Compressed air having a flow rate of 7 Nm ³ / min is introduced from the compressed gas supply nozzle of the collision type gas crusher to crush the object 10 to be ground.
Was supplied from the pulverized material supply pipe 2 at a rate of 37 kg / hr. The crushed pulverized product 10a was loaded on the classifier 11, the finely pulverized product was recovered, and the coarsely pulverized product was again charged into the accelerating pipe 6 together with the pulverized product 10 from the pulverized product supply port 1. As a result, 32.40 kg / hr of a pulverized product having a volume average particle size of 7.5 μm (measured by a Coulter counter) was recovered as a fine powder (yield 87.6%). Further, no fusion of the crushed object 10 on the collision surface 9a was observed even after continuous operation for 10 hours.

FIG. 5 is a view for explaining still another embodiment of the crushing device according to the present invention, in which 17 is an air supply port, 18 is an air supply device, and the other parts shown in FIGS. The same reference numerals as those in FIGS. 1 to 4 are given to the portions having the same function. In addition to the example shown in FIG. 4, the example shown in FIG. 5 has an air supply port 17 that is parallel to the central axis 4a of the injection part and opens to the ejection nozzle 5 side of the inner wall surface of the injection part 4, and an air supply port. An air supply device 18 for supplying air into the injection part 4 through 17 is arranged.

The object 10 to be crushed is conveyed to the injecting section 4 by the same process as the example shown in FIG. 1, and the clogging phenomenon of the object 10 to be crushed is prevented by the process similar to the example shown in FIG.
At this time, the air supplied from the air supply device 18 is sent in the B direction (shown in FIG. 5) through the air supply port 17, whereby the velocity component Ve in the direction of the central axis 4a of the injection portion of the object to be ground 10 is increased. The object to be crushed 10 that has risen and is in the acceleration tube 6
The velocity component Vx in the direction of the central axis 6a of the accelerating tube a is also increased.

Next, the result of crushing the object to be crushed will be described using the example shown in FIG. Using the raw materials shown in Table 1 above, the product obtained by the above treatment was used as the object to be crushed 10, the injection part 4 was the one shown in FIG. 5, and the other parts were the ones shown in FIG. The crushing was performed using a crushing device and a flow chart. A fixed wind power classifier was used as a means for classifying the crushed product 10a into fine powder and coarse powder.

Compressed air having a flow rate of 7 Nm ³ / min was introduced from the compressed gas supply nozzle of the collision type air flow crusher to obtain the crushed object 10
Was supplied from the crushed material supply pipe 2 at a rate of 42 kg / hr. The crushed pulverized product 10a was loaded on the classifier 11, the finely pulverized product was recovered, and the coarsely pulverized product was again charged into the accelerating tube 6 together with the pulverized product 10 from the pulverized product supply port 1. As a result, 36.7 kg / hr of a pulverized product having a volume average particle size of 7.5 μm (measured with a Coulter counter) was recovered as a fine powder (yield 87.4%). In addition, even if the continuous operation for 10 hours,
No fusion of the crushed object 10 on the collision surface 9a was observed.

FIG. 6 is a view for explaining still another embodiment of the crushing device according to the present invention, in which 19 is a roundness attached to the joint between the inner surface of the introduction part 3 and the inner surface of the injection part 4. 1 to 5 are included in other parts having the same functions as those in FIGS. 1 to 5.
The same reference numerals are given. In the example shown in FIG. 6, in addition to the example shown in FIG. 5, the joint portion between the inner surface of the introduction portion 3 and the inner surface of the injection portion 4 is rounded.

The object 10 to be crushed is conveyed to the injection section 4 by the same process as the example shown in FIG. At this time, the introduction part 3
Due to the roundness 19 provided at the joint between the inner surface of the and the inner surface of the injection part 4, the velocity loss of the object to be ground 10 at the joint (roundness 19) is reduced, and the object to be ground 10 has at the end of the introduction part 3. It is possible to bring the speed directly to the injection unit 4.

Next, the result of crushing the object to be crushed will be described with reference to the example shown in FIG. Using the raw materials shown in Table 1 and using the material obtained by the above treatment as the crushed object 10, the injection unit 4 shown in FIG. 6 is used, and the other parts are shown in FIG. The crushing was performed using a crushing device and a flow chart. A fixed wind power classifier was used as a means for classifying the crushed pulverized product 10a into fine powder and coarse powder.

Compressed air having a flow rate of 7 Nm ³ / min was introduced from the compressed gas supply nozzle of the collision type gas crusher to crush the object to be ground 10.
Was supplied from the pulverized material supply pipe 2 at a rate of 45 kg / hr. The crushed pulverized material 10 was loaded on the classifier 11, the fine pulverized material was recovered, and the coarse pulverized material was again charged into the accelerating tube 6 together with the pulverized material 10 from the pulverized material supply port 1. As a result, 38.0 kg / hr of a pulverized product having a volume average particle size of 7.5 μm (measured with a Coulter counter) was recovered as a fine powder (yield 8
4.4%). Further, no fusion of the crushed object 10 on the collision surface 9a was observed even after continuous operation for 10 hours.

FIG. 7 is a view for explaining still another embodiment of the crushing device according to the present invention. In the figure, 20 is the acceleration tube outlet at the joint between the inner surface of the injection part 4 and the inner surface of the acceleration tube 6. The roundness provided on the side of 6b, and other parts having the same functions as those in FIGS. 1 to 6 are denoted by the same reference numerals as those in FIGS. In the example shown in FIG. 7, in addition to the example shown in FIG. 6, the joint portion between the inner surface of the injection portion 4 and the inner surface of the acceleration tube 6 is rounded.

When the object to be ground 10 is conveyed from the injection section 4 to the acceleration tube 3 by the same process as in the example shown in FIG. 6, it is attached to the joint between the inner surface of the injection section 4 and the inner surface of the acceleration tube 6. Due to the roundness 20, the velocity loss of the crushed object 10 at the joint (roundness 20) is reduced, and the crushed object 10 can bring the speed at the end of the injection section 4 to the accelerating section 6 as it is. .

Next, the result of crushing the object to be crushed will be described with reference to the example shown in FIG. The raw materials shown in Table 7 were used, and the material obtained by the above treatment was used as the object to be crushed 10. The injection section 4 was the one shown in FIG. 7, and the other portions were the same as those shown in FIG. The crushing was performed using a crushing device and a flow chart. A fixed wind power classifier was used as a means for classifying the crushed pulverized product 10a into fine powder and coarse powder.

Compressed air having a flow rate of 7 Nm ³ / min was introduced from the compressed gas supply nozzle of the collision type air flow pulverizer, and the pulverized material 10 was supplied from the pulverized material supply pipe 2 at a rate of 41 kg / hr. The crushed pulverized product 10a was placed on the classifier 11, the finely pulverized product was recovered, and the pulverized product was again charged into the accelerating pipe 6 together with the pulverized product 10 from the pulverized product supply port 1. As a result, 35.0 kg / hr of a pulverized product having a volume average particle size of 7.5 μm (measured with a Coulter counter) was recovered as a fine powder (yield 85.4%). Further, no fusion of the crushed object 10 on the collision surface 9a was observed even after continuous operation for 10 hours.

[0035]

As is apparent from the above description, the present invention has the following effects. (1) Effect corresponding to claim 1; The crushed object supply pipe is composed of an introduction part and an injection part, and the injection part is inclined toward the acceleration pipe outlet side with respect to the introduction part, whereby the flow of the crushed object To reduce the clogging phenomenon of the crushed material at the crushed material supply port, and to increase the speed of the crushed material in the acceleration tube to reduce the impact when the crushed object collides with the collision surface. It is possible to increase the size to prevent the crushed object from being fused to the collision surface. This makes it possible to improve the yield of fine powder. (2) The effect corresponding to claim 2; In addition to the structure of claim 1, by supplying air to the object to be ground in the injection part, a gap is created between the objects to be ground, It is possible to carry more stably than the carrying of the crushed object due to the configuration. Thereby, the effect of claim 1 can be made more stable. (3) Effect corresponding to claim 3; In addition to the structure of claim 2, by supplying air in the flow direction of the object to be ground in the injection part, the speed of the object to be ground in the injection part and the acceleration pipe Is increased, and the impact of the crushed object with the collision surface can be further increased. This makes it possible to further improve the fine powder yield than the effect of claim 2. (4) Effect corresponding to claim 4 In addition to the structure of claim 3, by rounding the joint between the inner surface of the introduction part and the inner surface of the injection part, the velocity loss of the object to be ground is suppressed, and the object to be ground. It is possible to further increase the impact with the collision surface of the above than the impact according to the configuration of claim 3. This makes it possible to further improve the fine powder yield than the effect of claim 3. (5) Effect corresponding to claim 5: In addition to the structure of claim 4, by rounding the joint between the inner surface of the injection part and the inner surface of the acceleration part, the velocity loss of the object to be ground is reduced. It is possible to increase the impact of the crushed object on the collision surface by further suppressing the loss due to. This makes it possible to further improve the fine powder yield than the effect of the fourth aspect.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of a crushing device according to the present invention.

FIG. 2 is an enlarged view of an introduction part and an injection part shown in FIG.

FIG. 3 is a diagram for explaining the behavior of an object to be ground in the grinding apparatus according to the present invention.

FIG. 4 is a view for explaining another embodiment of the crushing device according to the present invention.

FIG. 5 is a view for explaining still another embodiment of the crushing device according to the present invention.

FIG. 6 is a main part configuration diagram for explaining still another embodiment of the crushing device according to the present invention.

FIG. 7 is a main part configuration diagram for explaining still another embodiment of the crushing device according to the present invention.

FIG. 8 is a diagram for explaining an example of a crushing device according to a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ground material supply port, 2 ... Ground material supply pipe, 3 ... Introduction part, 4 ... Injection part, 5 ... Jet nozzle, 6 ... Acceleration pipe, 7 ... Jet jet (high-speed airflow), 8 ... Grinding chamber, 9 ... collision member,
10 ... Object to be ground, 11 ... Classifier, 15 ... Air supply port, 1
6 ... Air supply device, 17 ... Air supply port, 18 ... Air supply device, 19 ... Roundness, 20 ... Roundness.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tomiaki Ito 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd.

Claims (5)

[Claims] 1. A jet nozzle for jetting a jet jet toward a crushing chamber, an accelerating pipe having one end connected to the tip of the jet nozzle and the other end opening to the crushing chamber, and the jet opening to the accelerating pipe. Grinding at least including a supply pipe for supplying an object to be ground into a jet flow, and a collision member that is installed so as to face the jet nozzle and has a grinding surface that directly collides the object to be ground with the jet jet to finely grind the object. In the device,
The supply pipe includes a vertical introduction part to which the object to be crushed is supplied, an injection part having one end connected to the introduction part and the other end opening to the acceleration pipe, and an inclining part in the jet jet direction. A crushing device comprising: 2. The injecting section has a first air supply port opening to the injecting section, and a first air supply means for supplying air to the injecting section through the first air supply port. The crushing device according to claim 1. 3. The injection unit has a second air supply port opening to the injection unit, and a second air supply means for supplying air to the injection unit through the second air supply port, The crushing device according to claim 2, wherein a center axis of the second air supply port is arranged in parallel with a center axis of the injecting section. 4. The crushing device according to claim 3, wherein a joint portion between the inner surface of the introduction portion and the inner surface of the injection portion has a rounded shape. 5. The crushing device according to claim 4, wherein the joint between the inner surface of the injection portion and the inner surface of the acceleration tube has a rounded shape.