JPH055952Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a device for coarsely crushing compression molded products in dry granulation methods that are widely used in the pharmaceutical, food, and other industries. The present invention relates to a crushing device for use in a dry granulation process, which can sequentially compress and crush a plate-like material and efficiently obtain regular particles of an optimal size.

(Prior art) Conventionally, in the dry granulation method for granulating products containing components that are easily decomposed by water or products for which fragrance is important from powder, roll compression molding and granulation equipment have generally been used. It's summery. As an example is shown in FIG. 5, this device is composed of a supply hopper 10, a pair of forming rolls 11a and 11b, a rotor-type crusher 14 consisting of a rotor 12 and a punching plate 13, and a roll-type crusher 15. There is. That is, the powder 16 charged into the supply hopper 10 is pushed between the pair of forming rolls 11a and 11b under the action of a vertical screw, and is compressed under appropriate pressure to form a plate-like material 17. Thereafter, the plate-like material 17 is crushed by the rotational impact force of the rotor 12 of the rotor-type coarse crusher 14, and is further rubbed against the punching plate 13 by centrifugal force and forced to pass through the hole, and is crushed by the next roll. It is sent to device 15.

(Problems to be Solved by the Invention) However, the above-mentioned conventional apparatus has various drawbacks, and troubles have frequently occurred during actual production. In other words, using the rotor-type crushing mechanism described above as a means of turning a large-volume plate-like material into a small-volume coarse crusher increases the residence time of the molded product, resulting in the generation of more fine powder than necessary. Not only did processing capacity decline, but serious problems related to product value were inevitable, such as problems with metal contamination due to rubbing against the punching plate.

However, in order to solve the above problems,
Improvements in dry granulation equipment have been proposed, as shown in US Pat. This improved device is a compression molding device with protruding protuberances on the circumferential surface of one of the rolls to form recesses parallel to and at the same intervals along the direction of travel of the plate-shaped molded product, and a gear-type roughening device. It is characterized by a mechanism in which it is fed between the gear teeth of a crushing and granulating device, and its shock cuts the recessed portion while shearing it in the width direction at the same time, thereby improving the drawbacks of the conventional device described above.

However, in the above-mentioned improved device, the cuts are formed in advance at the time of compression molding the plate-shaped object, so there is a problem that the compression molding becomes unstable depending on the physical properties of various powders, which have become diversified in recent years. It can be done. In addition, it goes without saying that it is necessary to adjust both the pitch between the ridges on the circumferential surface of the forming roll and the pitch between the gear teeth depending on the size of the desired granules, and a more serious problem is the problem of biting. The problem was that the plate-shaped body that was sent out did not fit properly between the gears due to slippage, etc., which caused trouble during actual production.

The present invention was developed in view of the above-mentioned circumstances, and involves forming a normal plate-like material in the compression molding process, and feeding it into a crushing device that has an extremely excellent biting action and crushing effect. The object of the present invention is to provide a coarse crushing device for use in a dry granulation process that can obtain the target regular-sized particles at once by passing through the particles.

(Means for Solving the Problems) The above purpose is to provide an apparatus of the present invention, that is, an apparatus for crushing a plate-like material molded by a compression molding apparatus, in which a pair of crushing rolls rotating in opposite directions are placed in an opposing state. are arranged in parallel, and on the outer surface of the pair of coarse crushing rolls,
A row of cone-shaped teeth continuously protruding in the circumferential direction is provided in a state in which each row is appropriately shifted in the circumferential direction, and in a state in which the teeth are staggered from each other over the entire length in the axial direction between the roll pairs. This is achieved using a coarse crusher in the dry granulation process.

(Function) The crushing apparatus having the above-mentioned structure is capable of simultaneously crushing a plate-like object into a target object by using a pair of crushing rolls having a unique surface shape. In other words, the teeth are cone-shaped and have an apex, and the plate-shaped object passing between them has a "point".
Because it hits with a hard surface, it has excellent chewing power and good biting.
Furthermore, by making the tooth rows staggered between both rolls and by appropriately shifting the pitch in the circumferential direction so that the apexes of the teeth are not lined up in a straight line in the axial direction,
It is possible to completely crush plate-like objects into coarse pieces of the desired size.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 2b shows a pair of crushing rolls 1a and 1b of the crushing device according to the present invention, which are arranged parallel to each other and opposite to each other below the compression molding device 3 as shown in FIG. direction, forming roll 3
The plate-shaped object 4 formed between a and 3b is crushed between them.

Next, the mechanism of the pair of coarse crushing rolls 1a and 1b, which forms the core of the apparatus of the present invention having the above-mentioned configuration, will be explained in more detail. This coarse crushing roll pair 1a, 1
On the outer surface of b, a tooth row L in which quadrangular pyramid-shaped teeth 2 of the same type and size as shown in FIG. 2a are continuously protruded along the circumferential direction as shown in FIG. 2b is arranged in parallel in the axial direction. , and by shifting the pitch in the axial direction by half a pitch in both roll pairs 1a and 1b, the rolls 1
When a and 1b are opposed in parallel, the teeth 2 and the circumferential grooves 2b between the teeth are staggered over the entire length in the axial direction.

In addition, the tooth row L in which the teeth 2 are continuously protruded as described above has an appropriate pitch shift in the circumferential direction, and in this embodiment, 2 rows A and 5 rows B having a half pitch shift appear alternately. That's what I do. The pitch and period of this circumferential deviation are not particularly limited, and may be adjusted as appropriate based on the requirements that the biting conditions of the plate-shaped object are good and that coarse particles of the desired size are obtained. It is configurable.

The shape of the teeth to be protruded may also be a conical shape with an apex, but in this example, the shape of the teeth is excellent as it has an excellent biting action on plate-shaped objects and is easy to manufacture. The teeth 2 of the eccentric square pyramid shape (the square pyramid with the apex shifted to one side) shown in Fig. 2a are placed in a state where the apex 2a thereof faces the direction of rotation of each of the rolls 1a and 1b, that is, between both pairs of rolls 1a and 1b. The vertices 2a of the teeth 2 are provided in a state where they are opposed to each other.

However, the coarse crushing roll pair 1 having the above-mentioned configuration
When a and 1b are arranged in parallel, at least 0.1
A gap of mm is required, but this gap is also set appropriately depending on the characteristics and thickness of the plate-like material 4. For example, it is also possible to provide a roll gap adjustment mechanism that gives an eccentric effect to the roll axis.

In other words, when the device of the present invention is used, the crushing device is in the state shown in FIGS. 3 and 4, and the plate-like material 4 fed from above (arrow
At the same time as it bites into the gap between the teeth 1b, it is crushed by the protruding teeth 2, and the desired crushed material 5 is always obtained in a stable state due to the shape of the teeth 2 and the protrusion mechanism.

Next, as a specific example, the results obtained when the apparatus of this embodiment was actually used to coarsely crush a plate-like material will be described.

Diameter Large diameter (including tooth height) 119.8mm Small diameter 113.8mm Number of teeth 48 teeth Width of tooth row (axial direction) 6mm A coarse crushing device in which the coarse crushing rolls manufactured as described above are arranged in parallel with a gap of 0.3 mm. Thickness 2~ using
As a result of coarsely crushing a plate-shaped material of 3 mm and width of 90 mm, the resulting crushed material has a thickness of 2 to 3 mm, a length of 3 to 5 mm, and a width of 5 to 15 mm.
It was confirmed that extremely homogeneous pulverized material could be obtained with almost no generation of unnecessarily fine powder.

(Effects) As described above, according to the crushing device according to the present invention, the plate-shaped material compression-molded in the dry granulation process is extremely efficiently crushed into the target homogeneous regular particles, and the subsequent process This will significantly reduce the load on

Furthermore, this device does not require a complicated mechanism, has a small number of parts, and is extremely easy to handle.

[Brief explanation of the drawing]

FIG. 1 is an overall explanatory diagram of the crushing device according to the present invention,
Figures 2a and b are partially enlarged views of a pair of coarse crushing rolls in the same device, Figures 3 and 4 are explanatory diagrams of the operation when using the same coarse crushing rolls, and Figure 5 is a diagram of a conventional crushing device. It is an explanatory diagram showing an example. 1a, 1b...Pair of coarse crushing rolls, 2...Teeth, 2a
... Vertex, 2b ... Circumferential groove, 3 ... Compression molding device,
3a, 3b... Molding roll, 4... Plate-shaped object, 5...
...Crushed material, L...Tooth row.

Claims (1)

[Claims for Utility Model Registration] (1) A device for crushing a plate-like material 4 molded by a compression molding device 3, which comprises a pair of crushing rolls 1a and 1b that rotate in opposite directions and are parallel to each other in an opposing state. On the outer surface of the pair of coarse crushing rolls 1a and 1b, a row of conical teeth 2 protruding in the circumferential direction is provided.
A coarse crushing device for a dry granulation process, characterized in that the coarse crushing devices are provided with appropriate circumferential deviations for each row, and are staggered from each other over the entire axial length between the pair of rolls 1a and 1b. . (2) The tooth 2 is formed into an eccentric square pyramid shape, and its apex 2
In the dry granulation process according to claim 1, wherein a is oriented in the rotational direction of each of the coarse crushing rolls 1a and 1b, and the deviation in the circumferential direction is the apex 2a shifted by half a pitch. Crushing equipment.