JP3071394B2 - Method and apparatus for removing resin powder in pellet cooling water tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for removing resin powder in a pellet cooling water tank, and more particularly to a method for removing resin powder without clogging using an endless screen and a means for discharging liquid or the like. A novel improvement for continuously removing

[0002]

2. Description of the Related Art Conventionally, as a resin powder removing apparatus of this kind, a construction shown in FIGS. 4, 5 and 6 has been generally employed. That is, what is indicated by reference numeral 1 in FIG. 4 is a tank connected to a pellet cutting device (not shown), and the inlet 1a of the tank 1 contains resin powder after removing pellets (not shown). Pellet cooling water 2 is supplied, and from the outlet 1b, the pellet cooling water 2 after filtering this resin powder through a screen 3 as a filter means is sent to a pellet cooling water pump 4. The above-mentioned screen 3 was provided detachably from the tank 1 as shown by an arrow A. Further, in the configuration shown in FIG.
It is formed in a cup shape, and is configured such that the position where the resin powder accumulates can be changed by rotating the screen 3 by rotating the lever 5. In the configuration shown in FIG. 6, two screens 3 are attached to the tank 1 at a substantially central portion so as to be able to be pulled out in the direction of arrow A so as to remove the resin powder.

[0003]

Since the conventional resin powder removing apparatus is configured as described above, there are the following problems. That is, in the case of the conventional configuration of FIG.
Since the resin powder is removed by using a single screen, the area of the screen is limited, and the pellet cooling water overflows before entering the tank due to clogging, thus requiring frequent cleaning. Further, in the case of the conventional configuration shown in FIG. 5, the screen area is small, and the screen must be cleaned frequently, so that continuous use is impossible. In the case of the conventional configuration shown in FIG. 6, the screen area is small, and the tank is divided into two rooms by the screen. Therefore, a water level difference occurs between the rooms, overflow occurs, and continuous use is impossible. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in particular, uses an endless screen and a means for discharging liquid or the like to continuously discharge resin powder without causing clogging. It is an object of the present invention to provide a method and an apparatus for removing resin powder in a pellet cooling water tank that is to be removed.

[0005]

According to the present invention, there is provided a method for removing resin powder in a pellet cooling water tank, wherein the resin powder in the pellet cooling water supplied from an inlet of the tank is filtered by a filter means. In the method for removing resin powder in the pellet cooling water tank supplied to the pellet cooling water pump from the outlet of the tank, an endless rotating screen is used as the filter means, and the resin powder attached to the screen is a liquid or This is a method of removing gas by spraying the gas onto the screen.

More specifically, there is a method of removing the resin powder attached to the outer surface of the screen with a scraper.

The apparatus for removing resin powder in a pellet cooling water tank according to the present invention is characterized in that the resin powder in the pellet cooling water supplied from the inlet of the tank is filtered by a filter means, and the pellet cooling water is pelletized from the outlet of the tank. In the apparatus for removing resin powder in a pellet cooling water tank supplied to a cooling water pump, the filter means includes an endless screen rotatably provided in the tank, and a liquid or a liquid is provided inside the screen. In this configuration, a discharge unit that discharges a gas is provided.

[0008] More specifically, the discharge means is constituted by a nozzle.

[0009] More specifically, the discharge means is constituted by a screen roller for supporting the screen, and a plurality of slits formed in the screen roller.

[0010] More specifically, a scraper is provided in contact with the outer surface of the screen.

More specifically, a guide member for guiding the resin powder to the outside is provided near the upper portion of the screen.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method and an apparatus for removing resin powder in a pellet cooling water tank according to the present invention will be described below with reference to the drawings. The same or equivalent parts as in the conventional example will be described with the same reference numerals.
In FIG. 1, reference numeral 1 denotes a pellet cooling water tank connected to a pellet cutting device (not shown). At the inlet 1a of the tank 1, resin powder from which pellets (not shown) have been removed is filled. Pellet cooling water containing 2
Is supplied from an outlet 1b, and the pellet cooling water 2 after filtering the resin powder through a screen 3 as a filter means.
Is sent to the pellet cooling water pump 4.

The screen 3 has an endless shape, and has a pair of guide rollers 10 and 1 provided on the tank 1.
1 and a screen roller 13 provided at a position above a guide member 12A for taking out the resin powder 12 so as to be endlessly rotatable.
The upper part of the screen 3 and the screen 3 is configured to be located higher than the water surface 14 of the tank 1. The screen roller 13 is driven by a motor 13a. In the vicinity of the screen roller 13 and at a position inside the screen 3, a discharge means 18 including a nozzle or the like connected to a drive source 15 such as air and connected to a control valve 17 having a level sensor 16 is provided. The resin powder 12 adhering to the screen 3 is removed by air or the like (liquid is also possible) discharged from the discharge means 18 and blown off toward the guide member 12A. Further, a scraper 19 having a large number of well-known scraping blades is provided rotatably in the vicinity of the screen roller 13, and the resin powder 12 attached to the outer surface of the screen 3 is scraped off by the scraper 19. Is dropped on the guide member 12A. The tank 1 is provided with overflow portions 20 and 21 for overflowing the pellet cooling water 2 and the tank 1
A replenishing water means 22 is provided so that water can be replenished when the level of the pellet cooling water 2 in the inside is reduced. If the pump volume is 500 liters / min and the size of the screen 3 is 1 m in width and 1 m in water depth, the flow velocity V of the water passing through the screen 3 becomes 0.5 m / min (about 8 cm / sec), and the screen 3 is used for cleaning. As a result of various experiments, it has been found that the screen 3 preferably has a well-known plain weave of about 100 mesh.

The discharge means 18 is not limited to the above-described nozzle, but may be, for example, a plurality of slits 2 formed in the screen roller 13 in the axial direction as shown in FIG.
3 is formed, and air or the like (or a liquid) from the driving source 15 is introduced into the inside of the screen roller 13 through a well-known rotary joint 24, discharged from the slit 23 and adhered to the screen 3. The blown resin powder 12 is blown off by discharging air or the like from the slit 23. Therefore, the discharge means 18 is constituted by the screen roller 13 and the slit 23 described above. In addition, the above-mentioned ejection means 18 is the same as that of FIG.
And without being limited to the configuration of FIG.
The resin powder 12 can also be removed by blowing air or the like from outside. The slit 23 is configured as shown in FIG. 3 and has a width of 1 to 2 mm and a length of 100 mm.
mm, the interval between the slits 23 is 50 mm, the air flow rate can be adjusted at 30 to 60 m / sec, and the air amount is about 1
0 m ³ / min. This air can be operated by a timer or a water level difference level of water caused by contamination of the screen 3.

Next, the operation will be described. First, the pellet cooling water 2 is supplied from the inlet 1a and the screen 3
Endless rotation, the resin powder 12 in the pellet cooling water 2
Adheres to the outer surface of the screen 3 and is removed.
The pellet cooling water 2 from which is removed is sent from the outlet 1b to the pellet cooling water pump 4. When performing the aforementioned continuous operation,
By actuating the discharge means 18, the resin powder is removed from the screen 3 and collected via the guide member 12A. Also, by operating the scraper 19,
The resin powder 12 is more reliably removed.

[0016]

The method and apparatus for removing resin powder in the pellet cooling water tank according to the present invention are configured as described above, so that the following effects can be obtained. That is, since the endless screen is rotated, the surface area of the filter means can be made larger than before so that a large amount of resin powder can be captured, and the resin powder can be automatically removed from the screen by the discharge means and the scraper. Maintenance such as is unnecessary, and abrasion due to resin powder in the pellet cooling water line, the cutter case, and the like can be greatly reduced, and labor saving and unmanned operation can be achieved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a resin powder removing device in a pellet cooling water tank according to the present invention.

FIG. 2 is a perspective view showing another embodiment of the discharging means of FIG.

FIG. 3 is an enlarged explanatory view showing a main part of FIG. 2;

FIG. 4 is a configuration diagram showing a conventional resin powder removing device in a pellet cooling water tank.

FIG. 5 is a configuration diagram showing a conventional resin powder removing device in a pellet cooling water tank.

FIG. 6 is a configuration diagram showing a conventional resin powder removing device in a pellet cooling water tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 1a Inlet 1b Outlet 2 Pellet cooling water 3 Screen 4 Pellet cooling water pump 12 Resin powder 12A Guide member 13 Roller for screen 18 Discharge means 19 Scraper 23 Slit

Claims (7)

(57) [Claims] A resin powder (12) in a pellet cooling water (2) supplied from an inlet (1a) of a tank (1) is filtered by a filter means, and the pellet cooling water (2) is filtered into the tank (1). ) Exit (1b)
In the method for removing resin powder in the pellet cooling water tank supplied to the pellet cooling water pump (4), using an endlessly rotating screen (3) as the filter means,
A method of removing resin powder in a cooling water tank for pellets, wherein the resin powder (12) attached to the screen (3) is removed by spraying a liquid or a gas onto the screen (3). 2. A method for removing resin powder in a pellet cooling water tank according to claim 1, wherein said resin powder attached to the outer surface of said screen is removed by a scraper. . 3. The resin powder (12) in the pellet cooling water (2) supplied from the inlet (1a) of the tank (1) is filtered by a filter means, and the pellet cooling water (2) is filtered into the tank (1). ) Exit (1b)
In the apparatus for removing resin powder in a pellet cooling water tank supplied to a pellet cooling water pump (4), the filter means comprises an endless screen (3) rotatably provided in the tank (1). And a discharge means (18) for discharging a liquid or a gas is provided inside the screen (3). The apparatus for removing resin powder in a pellet cooling water tank. 4. The apparatus according to claim 3, wherein said discharge means comprises a nozzle. 5. The screen according to claim 5, wherein the discharge unit is a screen.
(3) a screen roller (13) for supporting, a plurality of slits (23) formed in the screen roller (13),
4. The apparatus for removing resin powder in a pellet cooling water tank according to claim 3, comprising: 6. The pellet cooling water tank according to claim 3, wherein a scraper (19) is provided in contact with an outer surface of the screen (3). Resin powder removal equipment. 7. A guide member for guiding the resin powder (12) to the outside near the upper portion of the screen (3).
The resin powder removing device for a pellet cooling water tank according to any one of claims 3 to 6, wherein (12A) is provided.