JP2020099876A - Jet mill - Google Patents

Abstract

To provide a jet mill which can reduce raw material jamming from a raw material supply part to a connection part of a raw material supply nozzle, and can stably supply a raw material to a pulverization chamber.SOLUTION: A jet mill has: a raw material supply part (8) for receiving a raw material; a horizontal disk-like pulverization chamber (4); a raw material supply nozzle (9) which is connected to the raw material supply part, and jets a high pressure gas together with the raw material supplied from the raw material supply part to the pulverization chamber; a pulverization nozzle (6) which is located on a circumference of the pulverization chamber at a prescribed interval, and jets the high pressure gas to the pulverization chamber; and a vibrator (10) which vibrates a connection part of the raw material supply part and the raw material supply nozzle.SELECTED DRAWING: Figure 3

Description

The present invention relates to a jet mill that pulverizes raw materials by supplying high-pressure gas injected from a nozzle to the raw materials and causing the accelerated raw materials to collide with each other.

The jet mill is an air flow type crushing device that crushes the raw material by supplying high-pressure gas injected from a nozzle to the raw material and causing the accelerated raw materials to collide with each other in a crushing chamber.

In a general jet mill, a plurality of grinding nozzles are evenly arranged on the circumference of a closed hollow disk-shaped grinding chamber. One or more of the crushing nozzles serves as a raw material supply nozzle that supplies the raw material. By injecting high-pressure gas from the crushing nozzle and the raw material supply nozzle, a swirl flow is generated in the crushing chamber, and the raw materials injected from the raw material supply nozzle collide with each other to pulverize. In a conventional jet mill, high-pressure gas sent to a crushing chamber is filled in a hemispherical tank provided below the crushing chamber, and a crushing nozzle and a raw material supply nozzle are connected to the tank by a plurality of hoses. ..

In contrast to such a conventional jet mill, the applicant has developed the horizontal swirl flow type jet mill of Patent Document 1. This jet mill has a tank portion whose bottom surface is in a spherical arc shape, and integrally includes a closed portion having an outer edge flange formed on the upper surface of the tank portion. A raw material supply nozzle and a crushing chamber facing a plurality of raw material crushing nozzles are provided above the closing part, and the closing part and the lower plate of the crushing chamber are fastened to each other with bolts at the flange part, and the upper surface of the crushing chamber is attached. A discharge part with a discharge port for the crushed raw material is fastened with bolts. This jet mill can be easily disassembled by removing the fastening bolts at each site, and the entire interior can be delicately cleaned and cleaned.

JP, 2017-51916, A

However, if the raw material to be crushed is fibrous cotton, the raw material is clogged at the connection part of the raw material supply part and the raw material supply nozzle, and the raw material is smoothly supplied to the crushing chamber. There was a problem that I could not do it.

The present invention has been made to solve such a problem, and can reduce the clogging of the raw material at the connecting portion of the raw material supply nozzle from the raw material supply portion, and can stably supply the raw material to the grinding chamber. The purpose is to provide a jet mill.

The present invention has the following features in order to achieve the above object.

[1] A raw material supply unit for receiving raw materials,
A horizontal disk-shaped grinding chamber,
A raw material supply nozzle that is connected to the raw material supply unit and that injects high-pressure gas into the crushing chamber together with the raw material supplied from the raw material supply unit;
A crushing nozzle that is arranged at a predetermined interval on the circumference of the crushing chamber and injects high-pressure gas into the crushing chamber,
A jet mill comprising: a vibrating device that vibrates a solid-gas mixing section that is a connecting section of a raw material supply unit and a raw material supply nozzle.

[2] The jet mill according to [1], wherein the vibrating device is a device that is driven by an air jet type and vibrates vertically.

[3] The jet mill according to [1] or [2], wherein the vibration device is installed on the flange of the raw material supply section.

[4] The jet mill according to [3], wherein the vibration device is installed on the proximal end side of the raw material supply nozzle in the flange of the raw material supply section.

According to the jet mill of the present invention, it is possible to reduce the clogging of the raw material at the connecting portion of the raw material supply nozzle from the raw material supply section and to stably supply the raw material to the crushing chamber.

It is a side view which shows the structure of the jet mill which concerns on embodiment of this invention. It is a top view showing composition of a jet mill concerning an embodiment of the invention. It is a longitudinal section showing composition of an important section of a jet mill concerning an embodiment of the invention.

Embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a jet mill according to an embodiment of the present invention, and FIG. 3 is a vertical cross-sectional view showing a configuration of a main part of the jet mill.

The jet mill 1 has a hemispherical tank 2 having a spherical bottom surface, and a hollow disk-shaped housing 3 arranged on the tank 2. The inner space of the housing 3 has a double structure. A horizontal disk-shaped crushing chamber 4 is arranged in the center of the housing 3 in a plan view, and a high-pressure gas feeding section 5 which is a ring-shaped flow passage is arranged so as to surround the outer periphery thereof.

The high-pressure gas feed unit 5 and the tank 2 are connected to each other via the connection flow passage 12, and the high-pressure gas filled in the tank 2 is supplied to the high-pressure gas feed unit 5 through the connection flow passage 12. On the outer circumference of the crushing chamber 4, crushing nozzles 6 are evenly arranged. One or more of the crushing nozzles 6 is configured as a Venturi nozzle 7 for supplying the raw material. In the example of FIG. 1, it has nine crushing nozzles 6 and one venturi nozzle 7. High pressure gas is supplied to the crushing nozzle 6 from the high pressure gas feed unit 12.

The crushing nozzle 6 and the Venturi nozzle 7 are attached to the crushing chamber 4 with an inclination toward the outer peripheral side with respect to the center of the disk-shaped crushing chamber 4. By mounting the crushing nozzle 6 and the Venturi nozzle 7 in the crushing chamber 4 at an angle as described above, the high-pressure gas injected from the crushing nozzle 6 and the Venturi nozzle 7 flows along the side surface of the crushing chamber 4. A high-speed swirling flow can be generated in the crushing chamber 4.

A raw material supply unit 8 that takes the raw material supplied from a feeder (not shown) and supplies it to the Venturi nozzle 7 is provided upstream of the Venturi nozzle 7. The raw material supply part 8 is formed in a conical shape whose diameter becomes smaller as it goes downward, and the raw material is dropped and supplied to the solid-gas mixing part 11 provided on the inlet side of the venturi nozzle 7. The Venturi nozzle 7 is composed of a Venturi nozzle.

The raw material dropped and supplied from the raw material supply unit 8 to the solid-gas mixing unit 11 is sucked into the inlet side of the Venturi nozzle 7 by the high-speed jet stream from the material supply nozzle 9 and sent to the crushing chamber 6.

The raw material supply unit 8 is provided with a vibrating device 10 for vertically vibrating the solid-gas mixing unit 11, which is a connecting portion between the raw material supply unit 8 and the Venturi nozzle 7. In the example of FIG. 1, the vibration device 10 is attached to a flange portion 8a whose diameter increases from the upper end of the raw material supply portion 8 having an inverted conical shape.

As described above, in the solid-gas mixing unit 11, since the air flow is generated from the right to the left in FIG. 2 by the material supply nozzle 9, when the raw material to be crushed is a fibrous cotton, In the vicinity of the lower end of the raw material supply unit 8, a bridge extending in the vertical direction is likely to occur near the left side of FIG.

Therefore, in the present embodiment, the vibration device 10 is attached to the material supply nozzle 9 side of the flange portion 8a. According to this, the material clogging can be prevented and eliminated by breaking the bridge of FIG. 2 to the right.

The vibration direction of the vibration device 10 may be any of various directions such as a vertical direction, a horizontal direction, or a combination thereof. However, it is preferable to select a vibrating device 10 that vibrates in the vertical direction as in the present embodiment, because the raw material clogged in the solid-gas mixing portion 11 can be shaken off by using the force of gravity.

Further, the vibrating device 10 may be attached at any position as long as it can vibrate the solid-gas mixing portion 11 that is a connecting portion between the raw material supply portion 8 and the Venturi nozzle 7, but, for example, in the horizontal direction. A combination of attaching a vibrating element in the vertical direction of the flange portion 8a (FIG. 2) is also a preferable example because the root of the bridge can be destroyed.

Any driving method may be used for the vibration device 10, but an air jet method is preferably used from the viewpoint of preventing contamination.

On the upper surface of the lower plate 4a of the crushing chamber 4, a conical protrusion 4b is formed in the central portion. The protrusions 4b are configured to assist the swirling flow of the high-pressure gas in the crushing chamber 4 and to assist its rise.

A discharge port 14 for taking out the crushed raw material is provided at the center of the upper surface of the crushing chamber 4.

The tip of a high-pressure gas supply pipe 13 is connected to the center of the bottom surface of the tank 2.

The jet mill 1 is supported by a frame 22 having a plurality of legs 20, 20... The gantry 22 has casters 21, 21... On its lower surface, and the jet mill 1 can be easily moved.

In the jet mill 1 thus configured, the raw material supplied to the raw material supply section 8 is dropped and supplied to the solid-gas mixing section 11. Since the vibrating device 10 is connected to the raw material supply unit 8, while the raw material supply unit 8 is supplying the raw material, the raw material supply unit 8 and the solid-gas mixing unit 11 are integrated by the vibration of the vibrating device 10. And vibrate. Therefore, due to the vibration of the vibrating device 10, the clogging of the raw material in the solid-gas mixing section 11 which is the connecting portion between the raw material supply section 8 and the raw material supply nozzle 10 can be prevented. It can be shaken off.

The raw material dropped into the solid-gas mixing section 11 is sucked into the Venturi nozzle 7 by the high-speed jet flow supplied from the material supply nozzle 9, and is supplied from the Venturi nozzle 7 to the crushing chamber 4.

The crushing chamber 4 is supplied with high-pressure gas from crushing nozzles 6 that are evenly arranged on the outer circumference of the crushing chamber 4. The raw material introduced into the crushing chamber 4 swirls in the crushing chamber 4 at high speed by the high-speed swirling flow of the high-pressure gas injected from the Venturi nozzle 7 and the crushing nozzle 6. The swirling raw materials collide with each other and the raw materials are crushed. The crushed raw material is taken out from the discharge port 14 provided above the central portion of the crushing chamber 4.

In the jet mill 1 according to the present invention, by providing the vibrating device 10 that vibrates the solid-gas mixing section 11 that is a connecting section between the raw material supply section 8 and the Venturi nozzle 7, the raw material clogging that occurs in the solid-gas mixing section 11 can be prevented. It can be prevented and the crushing process can be performed smoothly. Further, by reducing the clogging of the solid-gas mixing section 11, it is possible to improve the maintainability. Further, by installing the vibrating device 10 in the raw material supply unit 8, it is possible to reduce clogging by vibrating the inlet side of the solid-gas mixing unit 11 that is more likely to be clogged.

The present invention is not limited to the above embodiment, and various design changes can be made. For example, in the above description, the vibrating device of the present invention is applied to the jet mill in which a hose is not connected to the outside of the housing disclosed in Japanese Patent Laid-Open No. 2017-51916. The present invention can be applied to a jet mill in which a plurality of hoses are connected.

1 Jet Mill 2 Tank 3 Housing 4 Grinding Chamber 6 Grinding Nozzle 7 Venturi Nozzle 8 Raw Material Supply Section 9 Material Supply Nozzle 10 Vibration Device 11 Solid-Mixer Mixing Section 12 Connecting Flow Path 13 Air Supply Pipe 14 Discharge Port 20 Leg 21 Castor 22 Stand

Claims (4)

A raw material supply unit for receiving raw materials,
A horizontal disk-shaped grinding chamber,
A raw material supply nozzle that is connected to the raw material supply unit and that injects high-pressure gas into the crushing chamber together with the raw material supplied from the raw material supply unit;
A crushing nozzle that is arranged at a predetermined interval on the circumference of the crushing chamber and injects high-pressure gas into the crushing chamber,
A jet mill comprising: a vibrating device that vibrates a solid-gas mixing section that is a connecting section of a raw material supply unit and a raw material supply nozzle. The jet mill according to claim 1, wherein the vibrating device is a device that is driven by an air jet type and vibrates in the vertical direction. The jet mill according to claim 1, wherein the vibration device is installed on a flange of the raw material supply unit. The jet mill according to claim 4, wherein the vibrating device is installed on the base end side of the raw material supply nozzle in the flange of the raw material supply unit.

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