JPH0723120Y2 - Roll compactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a roll compressor, and more particularly to a roll compressor for compressing a material containing a large amount of fine powder.

[Conventional technology]

Conventionally, as a roll compressor that supplies a material containing a large amount of fine powder using a set of rotating rolls and compresses pressure into briquettes and flakes, a pushing screw is provided between the rotating rolls and the outside of the cylindrical portion of the pushing screw is used. Attach the filter cylinder to the vacuum pump, connect the vacuum pump to the material containing a large amount of fine powder, and press the screw between the rotating rolls to drive the vacuum pump. By passing through it, exhausting it to the outside of the machine and degassing it in vacuum, the porosity of the material is reduced, followed by compression molding between rotating rolls to improve the strength of the molded product. Is known (Japanese Patent Laid-Open No.
-44300 publication).

[Problems to be solved by the device]

However, in the above-described conventional configuration, since the filter cylinder is not provided in the tapered portion between the pair of rotating rolls, the reduction of the porosity of the material by the vacuum degassing at the position immediately before the start of the compression molding of the material is sufficient. Not. Therefore, the subsequent compression molding between the rotating rolls is not sufficient, a densified molded product cannot be obtained, and the strength of the molded product is impaired.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to push a material containing a large amount of fine powder between a pair of rotating rolls by a pushing screw having a tapered portion. The taper cylinder de-cylinder is provided at the position immediately before the start of the compression molding of the material in the taper portion between the two, and the air in the material is vacuum deaerated to immediately reduce the porosity of the material between the rotating rolls. It is to provide a roll compressor for compression molding.

[Means for Solving the Problems]

According to the present invention, in a roll compressor having a vertical rotating shaft with a stirring blade in the upper part and a pushing screw in the lower part, a material is press-fitted with a taper part just above a pair of rotating rolls. Is provided with a push-in screw, and the outside of the push-in screw is provided with a tapered cylindrical de-cylinder lined with a ventilation plate made of a porous material, and an annular portion of the de-cylinder and the outer cylinder is connected to a vacuum pump. . Further, in the present invention, the de-cylinder has a tapered cylindrical shape, inside of which a ventilation plate is divided in the circumferential direction and is lined on the inner surface of the porous support plate, and grooves are formed in the longitudinal direction between the ventilation plates. In addition, an annular portion is formed on the outer side of the porous support plate with the outer cylinder.

[Action]

With the above configuration, the material to be compression-molded is supplied to the hopper, but the material contains fine powder, and the agglomerates formed by the particles, the fine powder, and the voids formed by air are mixed irregularly in contact with each other. It has an aggregated state with low bulk density. The above material is agitated by a stirring blade in the hopper so that the particles slide and collide with each other, and the above aggregated state is destroyed, and the material particles are evenly dispersed in the hopper. Gravity descends and moves from the bottom of the hopper to the push-in screw.

Thus, in the lower part of the hopper, the material containing fine powder in a uniformly dispersed state moves while filling its cross section, and the presence of voids in the material is significantly reduced as compared with the feed material.

Then, when a material having a fine powder and in a dispersed state is pressed between a pair of rotating rolls by a pushing screw having a taper portion inserted in the taper de-cylinder, the material is in a position just before the start of compression molding of the material. The air in the material is vacuum degassed by the de-cylinder, and the material compression by the pushing screw is added to uniformly reduce the porosity of the material, and the material with the uniformly reduced porosity is immediately rotated on the roll. The voids of the material are further remarkably reduced by compression molding between the above and the roll molding, and a molded product having a high density and high strength can be produced with an improved molding yield.

In this way, the material containing a large amount of fine powder, which is irregularly aggregated at a low bulk density, is dispersed by the stirring blades, and the formability with reduced porosity due to vacuum deaeration and material compression is improved. The effect of producing a high-density molded product that is converted into a material and finally reduced in the porosity of the material by compression molding is that the stirring blade, the pushing screw, the de-cylinder, and the rotating roll, which are all vertically arranged, Since it is achieved by continuous operation under the descending flow of material, the compression molding performance of the roll compressor can be remarkably improved, and the molded product should have high density under the dense packing structure. Produced.

Moreover, it is possible to prevent the above-mentioned vertically arranged component members from increasing the length required for the operation, in other words, significantly increasing the overall arrangement height.

〔Example〕

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

In FIG. 1, 1,1 indicate a set of rotating rolls, which are rotated in the direction of arrow A by a driving device (not shown) so that a plurality of molds are arranged on the outer peripheral surface of the rotating rolls 1,1. Or a smooth surface is formed. The rotating rolls 1,1 are positioned under a gap G, and the material is accompanied by the reduction of the gap formed between the outer surfaces of the rotating rolls 1,1 as the rotating rolls 1,1 rotate. When the material is finally discharged from the gap G while reducing the volume of the material, the material is compression-molded.

Reference numeral 2 denotes a push screw, which is vertically provided between the rotating rolls 1 and 1, is attached to the vertical rotating shaft 3, and is rotated by the driving device 4. A de-cylinder 5 is provided on the outside of the pushing screw 2 so as to surround the de-cylinder 5, and more specifically, it is provided at a position immediately before a starting point 5a of compression molding of the material by the rotating rolls 1, 1.

Reference numeral 15 denotes a hopper, which is mounted on a frame material 17, a lower end portion thereof is connected to an upper end portion of the de-cylinder 5, and a material supply port 16 is provided at a top portion of the hopper 15. The vertical rotating shaft 3 has a stirring blade above the pushing screw 2.
14 is also attached and moved along the inner surface of the hopper 15,
A material containing a large amount of fine powder that is irregularly aggregated at a low bulk density supplied from the supply port 16 is subjected to a stirring action in the hopper 15, the above aggregated state is destroyed, and the material particles are uniform. While being in a dispersed state, it is prevented from adhering to and depositing on the inner surface of the hopper 15, and is moved from the bottom of the hopper 15 to the pushing screw 2 under a uniform dispersed state.

In FIGS. 2 and 3, the de-cylinder 5 has a tapered cylindrical shape, and a ventilation plate 6 having air permeability is provided on the inner side of the porous support plate 7 and is lined with, for example, four sheets. There is. A plurality of spaces are provided between the ventilation plates 6 to form the groove 6a.
Are formed in the vertical direction, and the stoppers 9 are formed on the outer surface of the porous support plate 7 at the positions corresponding to the spaces.
Are attached so as to be integrated with each other, and are attached with annular members 12 at the upper and lower ends (not shown) of the de-cylinder 5. Further, the annular member 12 is inserted into the mounting portion of the seat plate 13, and an annular portion 11 having a space is provided between the outer cylinder 10 provided at the lower portion of the seat plate 13 and the de-cylinder 5. Has been. In the groove 6a, when the material moves between the pushing screw 2 and the de-cylinder 5, the groove 6a
Also, the material is filled with the material, and the material filled between the pushing screws 2 is brought into contact therewith, so that the material is pushed into the pushing screw 2.
It avoids idling in the meantime, and is smoothly moved along the two faces of the pushing screw, so that both rotating rolls 1,1
It is supposed to be bitten in between.

Then, as shown in FIG. 1, the annular portion 11 is connected to a vacuum pump 19 through a conduit 18, and a large amount of air in the material passes through the ventilation plate 6 of the de-cylinder 5, the porous support material 9 and the annular portion 11. It is evacuated and vacuum degassed. Also, the conduit 18
Is connected to the air conduit 20 in a branched manner, and when the ventilation plate 6 is clogged with a material due to long-term operation,
The ventilation plate 6 is cleaned by introducing compressed air from the air conduit 20. Thus, after the cleaning of the ventilation plate 6 is completed, the vacuum pump 19 is driven again via the conduit 18 to perform vacuum deaeration.

Next, the operation will be described.

When a material containing a large amount of fine powder is supplied from the supply port 16 into the hopper 15 under a filling state with a high porosity, the material moves uniformly while being dispersed by the movement of the stirring blade 14, and is pushed from the bottom of the hopper 15. The material is pressed into the screw 2 according to the rotation of the pushing screw 2 under the filled state in the de-cylinder 5, and when the vacuum pump 19 is driven, the material immediately before the compression molding of the material is started. Vacuum deaeration of a large amount of air in the material is performed at the position to reduce the porosity of the material, resulting in a material with less air content and an increased bulk density, and the formability is significantly improved. In this way, the material with improved moldability is pressed between the rotating rolls and compressed,
Molded products are produced with high strength under a dense packing structure.

[Effect of device]

As described above, the present invention uses a stirring blade to disperse a material containing a large amount of fine powder that is in an irregularly aggregated state at a low bulk density, and uses decylinder in the tapered portion of the pushing screw. At the position immediately before the start of compression molding of the material, the air in the material containing a large amount of fine powder is vacuum degassed, and the material is converted into a material with improved moldability, and subsequently the material is compressed and molded between the rotating rolls. Since it is performed under continuous movement, the porosity of the material is sufficiently reduced, so even when molding a material containing a large amount of fine powder with a high porosity, it is a high-density, high-strength molding with a dense packing structure. Products can be produced with a high molding yield.

Further, the groove portion of the de-cylinder can ensure the continuous movement of the material that is press-fitted by the pushing screw, ensure the material to be caught between the rotating rolls, and improve the compression molding performance.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and FIG.
1 is a plan view of the de-cylinder shown in FIG. 1, and FIG. 3 is a detailed sectional view of a main part of the de-cylinder shown in FIG. 1,1 ...... Rotary roll 2 …… Insertion screw, 5 …… De-cylinder 6 …… Ventilation plate, 10 …… Outer cylinder 11 …… Annular part, 19 …… Vacuum pump

Claims (2)

[Scope of utility model registration request] 1. A roll compressor having a vertical rotating shaft having a stirring blade at the upper portion and a pushing screw at the lower portion, and a material is press-fitted with a tapered portion directly above a pair of rotating rolls. A push-down screw is provided, and a tapered cylindrical de-cylinder provided with a vent plate made of a porous material is provided outside the push-in screw, and an annular portion between the de-cylinder and the outer cylinder is connected to a vacuum pump. Roll compressor characterized by. 2. The de-cylinder has a tapered cylindrical shape, inside of which a ventilation plate is circumferentially divided and lined on the inner surface of a perforated support plate, and grooves are formed in the ventilation plate in the longitudinal direction. At the same time, the roll compressor according to claim 1, characterized in that an annular portion is formed between the outer side of the porous support plate and the outer cylinder.