JP2009269298A - Equipment and method of cleaning surface of dice - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To aim a safe removal of a molten resin on the discharge surface of a dice by making a wiper rotatable from the outside inside a safety cover provided on the discharge surface. <P>SOLUTION: Equipment of cleaning the surface of the dice includes the safety cover (5) of an outer box-like shape, a wiper holder (21) provided at the end of a shaft (10) held by the safety cover (5), a plurality of wipers (20) held by the wiper holder (21), a handle (9) controlling an axial location, provided on the shaft (10), a plurality of rotating handles (13) provided on the shaft (10), water supply piping (25) provided inside the safety cover (5), and a spray nozzle (26) provided on the water supply piping (25), and is characterized in that the molten resin can be removed by the wipers (20). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a die surface cleaning apparatus and method, and more particularly to a novel improvement for cleaning the surface of a die provided at the tip of an extruder for melting and kneading synthetic resin with a wiper of a wiper holder.

  In general, a synthetic resin raw material produced by a synthesizing apparatus is generally a screw type extruder (hereinafter referred to as “extruder”) whose main component is a cylinder into which a screw is inserted for the purpose of quality improvement or homogenization of the raw material. And abbreviated as “.” And then discharged and granulated into pellets by a granulator. In the extruder, a die is disposed at the tip of a cylinder that is disposed with the shaft core horizontal so that the discharge surface is vertical. The melted and kneaded synthetic resin raw material in a molten state passes through a large number of die holes formed in a circular band shape on the die surface, and is discharged in the form of a string (strand) in the horizontal direction.

  When the running extruder is temporarily stopped after production or due to some maintenance reasons, the high-temperature molten synthetic resin material remaining in the cylinder naturally flows out of the die hole, Flowing down the surface of the. The molten synthetic resin raw material has wettability to the surface of the metal die. Therefore, when left in a dripping state, the cooled synthetic resin material is firmly fixed to the die surface. It is very difficult to remove the fixed synthetic resin material, and a lot of labor is required.

  When starting the granulation by operating the extruder, it is necessary for the cutting blade of the granulator to slide smoothly along the flat die surface, so the extruder was stopped and left as it was, and it cooled In a state where the synthetic resin raw material is fixed to the die surface, the granulator cannot be started up in a normal state. Therefore, when the operation of the extruder is stopped, the synthetic resin raw material flowing out from the die hole is surely removed, and the die surface is cleaned.

  Conventionally, the surface of the die when the operation of the extruder is stopped is manually performed by maintenance personnel as shown in FIG. That is, after disassembling and removing the granulator from the tip of the extruder to secure a working space, the discharge surface 1a of the die 1 is removed from the scraper 2 or the tip shovel using a work tool 2 such as a scraper or a tip shovel. And scraping off the molten resin 3 flowing down from the die hole. Therefore, a cleaning device that is directly installed on the die has not been developed, and there is no literature.

  Since the conventional apparatus and method for cleaning the die surface for an extruder are configured as described above, the following problems exist. In other words, the processing capacity per extruder is increased, and the equipment is increased in size. With such a situation, the number of die holes increases and the diameter of the circular die becomes larger, thus maintaining Cleaning work by staff has become difficult. In a large capacity extruder, when the operation is stopped, the amount of the synthetic resin raw material that flows out from the die hole and flows down the surface of the die increases, and the processing is not partitioned by the maintenance personnel. In addition, the size of the apparatus was increased, the position of the die was raised from the floor surface, and the position of the cleaning operation was increased by increasing the diameter. As a result, the cleaning worker had to work in an unreasonable posture, such as stretching out. In addition, a state in which a high-temperature molten resin falls from above or above the cleaning worker has occurred, increasing the burden on the cleaning worker.

The die surface cleaning device according to the present invention is disposed in a state of covering the discharge surface of the die, and the overall shape forms a box shape, and a lower open type safety cover, and a rotary shaft insertion cylinder provided in the safety cover. An external rotary shaft provided; an internal rotary shaft provided rotatably in the external rotary shaft via a ball bearing; and a wiper holder connected to the internal rotary shaft and having a wiper at a tip. A shaft, a rotary handle provided at an outer end portion of the internal rotary shaft for rotating the shaft, and a water supply pipe provided on the safety cover and having a fountain nozzle, the fountain from the fountain nozzle being Supplying to the discharge surface and rotating the wiper via the wiper holder allows the discharge surface to be cleaned and provided on the external rotating shaft. The axial rotation position adjusting handle is provided, and the external rotating shaft is provided with a chain sprocket adjacent to the rotating handle, and the die surface cleaning method according to the present invention is also provided. Is arranged in a state of covering the discharge surface of the die, the overall shape is box-shaped, and a lower open type safety cover, an external rotary shaft provided in a rotary shaft insertion cylinder provided in the safety cover, An internal rotary shaft provided in the external rotary shaft via a ball bearing so as to be rotatable and axially movable; a shaft having a wiper holder connected to the internal rotary shaft and having a wiper at a tip; and A fountain from the fountain nozzle is forwarded using a rotary handle provided at an outer end for rotating the shaft and a water supply pipe provided at the safety cover and having a fountain nozzle. A method of cleaning the discharge surface by supplying to the discharge surface and rotating the wiper through the wiper holder, and having an axial position adjustment handle provided on the external rotation shaft Further, a chain sprocket is provided on the external rotating shaft adjacent to the rotating handle.

Since the die surface cleaning apparatus and method according to the present invention are configured as described above, the following effects can be obtained. That is, it is disposed in a state of covering the discharge surface of the die, and the overall shape forms a box shape, and a lower open type safety cover, and an external rotary shaft provided in a rotary shaft insertion cylinder provided in the safety cover, An internal rotary shaft provided in the external rotary shaft via a ball bearing so as to be rotatable and axially movable; a shaft having a wiper holder connected to the internal rotary shaft and having a wiper at a tip; and A rotating handle provided at an outer end for rotating the shaft, and a water supply pipe provided at the safety cover and having a fountain nozzle, and supplying fountain from the fountain nozzle to the discharge surface, Since the wiper rotates through the wiper holder and the discharge surface is cleaned, the molten resin discharged from the discharge surface of the die is water. Being retirement are removed by a wiper, it without being scattered from the safety cover, it is possible to discharge the solidified shaped resin from the lower opening of the safety cover.
In addition, the wiper can be easily rotated from the outside of the safety cover by having an axial position adjusting handle provided on the external rotating shaft.
Further, the external rotating shaft is provided with a chain sprocket adjacent to the rotating handle, so that the wiper can be rotated through the chain.

  According to the present invention, a safety cover of a lower open type is disposed on the surface of a die provided at the tip of an extruder, and the surface of the die is safely cleaned by a wiper of a wiper holder that is positioned and rotated in the safety cover. An object of the present invention is to provide an apparatus and method for cleaning a die surface.

Hereinafter, preferred embodiments of a die surface cleaning apparatus and method according to the present invention will be described with reference to the drawings.
Note that the same or equivalent parts as in the conventional example will be described using the same reference numerals.
In FIG. 1, reference numeral 4 denotes a cleaning device disposed on the discharge surface 1 a which is the surface of the die 1, and the safety cover 5 of the cleaning device 4 has a box shape as a whole and has an opening at the bottom. It is comprised by the lower opening type | mold which has 1A.

The front plate 5a of the safety cover 5 is provided with a rotating shaft insertion cylinder 6 (details are shown in FIG. 4).
As shown in FIG. 4, the rotary shaft insertion cylinder 6 is composed of a cylindrical external rotary shaft 7 and a cylindrical internal rotary shaft 8 that is inserted into the cylinder of the external rotary shaft 7 and protrudes from both ends thereof. The external rotary shaft 7 is inserted into the rotary shaft insertion cylinder 6 of the safety cover 5. The external rotary shaft 7 is configured by being inserted into the rotary shaft insertion cylinder 6 and screwed. The axial position adjustment handle 9 is provided at an intermediate portion of the external rotary shaft 7 not inserted into the rotary shaft insertion cylinder 6. It is held at right angles to the axis.

  The internal rotation shaft 8 is screwed and integrated with a shaft 10 protruding into the safety cover 5. The internal rotation shaft 8 may be configured by integrating a plurality of shafts other than one. The internal rotary shaft 8 is supported at both ends of the external rotary shaft 7 by providing a thrust ball bearing 11 on the front end (left side in FIG. 4) and a radial ball bearing 12 on the rear end (right side in FIG. 4). Yes.

  A plurality of rod-shaped rotary handles 13 are provided radially at a plurality of locations (for example, six locations as shown in FIG. 3) on the circumference of the circumference of the inner rotary shaft 8 around the circumference. A chain sprocket 14 is fixedly provided adjacent to the chain sprocket 14. A chain 15 is hung on the chain sprocket 14 as shown in FIG. 1 or FIG. The rotary handle 13 is not limited to a plurality of rod-shaped members, and may be configured integrally with a wheel shape.

  A wiper holder 21 having a metal wiper 20 is provided at the tip of the shaft 10, and the wiper holder 21 is provided along the discharge surface 1a of the die 1. The wiper holder 21 is distributed in a circular belt shape. The holding member 22 is formed in a circular shape having a smaller diameter than the discharge surface 1a, and a plurality of support members 23 project from the holding member 22 in the radial direction. Each wiper 20 is supported by the support member 23.

  As shown in FIGS. 1 and 2, the water supply pipe 25 provided in the safety cover 5 is provided inside the front plate 5 a of the safety cover 5, and the water supply pipe 25 is provided on the discharge surface 1 a of the die 1. A plurality of fountain nozzles 26 are provided so as to cool the entire area of a large number of die holes (not shown) that are arranged in a circular shape along a circular band.

  The extruder die surface cleaning device 4 configured as described above is used as follows. That is, when the operating extruder is stopped, immediately, the granulating device arranged facing the die 1 is disassembled and removed, and then the cleaning device 4 is assembled to the die 1. As a result, the discharge surface 1 a of the die 1 is covered with the safety cover 5 of the cleaning device 4.

  Next, when the external rotation shaft 7 is rotated by operating the axial position adjustment handle 9, the female screw 6a of the rotation shaft insertion tube 6 of the safety cover 5 and the male screw 7a of the external rotation shaft 7 are screw-coupled. Since the thrust ball bearing 11 prevents the external rotary shaft 7 and the internal rotary shaft 8 from moving in the axial direction, the external rotary shaft 7 moves forward and backward into the safety cover 5 by a minute distance. By operating the axial position adjusting handle 9, the external rotary shaft 7 rotates and advances / retreats in the axial direction, the internal rotary shaft 8 advances / retreats in the same amount, and the wiper holder 21 has the same amount. The wiper 20 moves forward and backward, and the wiper 20 moves forward and backward by the same amount. The wiper 20 approaches and separates from the discharge surface 1a of the die 1 by the same amount (in the axial direction as shown by the solid and dotted lines in FIG. 1). Move). Therefore, the axial position adjusting handle 9 is operated so that the wiper 20 is adjusted so as to come into contact with the discharge surface 1a of the die 1 in an appropriate pressure state.

  Next, when cooling water is supplied from an external water supply pipe (not shown) to the water supply pipe 25 through the water supply pipe connecting portion and is continuously ejected from the fountain nozzle 26, the cooling water is a plurality of fountains provided in the water supply pipe 25. It is ejected from the nozzle 26 toward the ejection surface 1a, and is ejected so as to cover the entire area of a large number of die holes distributed in a circular belt shape. Accordingly, the molten resin 3 flowing out from the discharge surface 1a and the die holes is sequentially cooled over the entire area where a large number of die holes are distributed. Although the outer periphery of the molten resin 3 flowing out from the die hole is not sufficiently cooled by the cooling water ejected from the fountain nozzle 26, it is cooled and solidified, and is not pushed down on the discharge surface 1 a but rather extruded in a strand shape. It becomes a state.

  Next, when the rotary handle 13 is operated (manually or by a motor) to rotate the internal rotary shaft 8, the wiper holder 21 turns, the wiper 20 turns, and the molten resin 3 can be scraped off. The scraped molten resin 3 falls inside the safety cover 5 together with the jetted cooling water, and falls outside through the opened opening 6. Note that the wiper holder 21 can be rotated by the chain 15 instead of the rotary handle 13.

It is a sectional side view which shows the cleaning apparatus of the die surface by this invention. It is a left view in FIG. It is a right view in FIG. It is an expanded sectional view which shows the rotating shaft part of the cleaning apparatus of the die surface by this invention. It is an enlarged view which shows the wiper of FIG. It is an enlarged view which shows the fountain nozzle of FIG. It is a block diagram which shows the conventional cleaning method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dies 1a Discharge surface 1A Opening 4 Cleaning device 5 Safety cover 5a Front plate 6 Rotating shaft insertion cylinder 7 External rotating shaft 8 Internal rotating shaft 9 Axial position adjustment handle 10 Axis 11 Thrust ball bearing 12 Radial ball bearing 13 Rotating handle 14 Chain Sprocket 15 Chain 20 Wiper 21 Wiper holder 25 Water supply pipe 26 Fountain nozzle

Claims (6)

The cover (1a) of the die (1) is disposed in a state of covering the discharge surface (1a), and the overall shape is box-shaped and the lower cover type safety cover (5), and the rotary shaft insertion cylinder provided in the safety cover (5). (6) An external rotary shaft (7) provided in the inner rotary shaft (8) provided in the external rotary shaft (7) via a ball bearing (11, 12) and freely movable in the axial direction. ), A shaft (10) having a wiper holder (21) connected to the internal rotation shaft (8) and having a wiper (20) at the tip, and the shaft provided at the outer end of the internal rotation shaft (8). A rotating handle (13) for rotating (10), and a water supply pipe (25) provided on the safety cover (5) and having a fountain nozzle (26),
The fountain (26a) from the fountain nozzle (26) is supplied to the discharge surface (1a), and the wiper (20) rotates through the wiper holder (21), whereby the discharge surface (1a) A cleaning apparatus for a die surface, wherein upper cleaning is performed.   The die surface cleaning apparatus according to claim 1, further comprising an axial position adjusting handle (9) provided on the external rotating shaft (7).   3. The die surface cleaning device according to claim 1, wherein a chain sprocket (14) is provided on the external rotating shaft (7) adjacent to the rotating handle (13). The cover (1a) of the die (1) is disposed in a state of covering the discharge surface (1a), and the overall shape is box-shaped and the lower cover type safety cover (5), and the rotary shaft insertion cylinder provided in the safety cover (5). (6) An external rotary shaft (7) provided in the inner rotary shaft (8) provided in the external rotary shaft (7) via a ball bearing (11, 12) and freely movable in the axial direction. ), A shaft (10) having a wiper holder (21) connected to the internal rotation shaft (8) and having a wiper (20) at the tip, and the shaft provided at the outer end of the internal rotation shaft (8). A rotating handle (13) for rotating (10) and a water supply pipe (25) provided on the safety cover (5) and having a fountain nozzle (26),
The fountain (26a) from the fountain nozzle (26) is supplied to the discharge surface (1a), and the wiper (20) rotates through the wiper holder (21), whereby the discharge surface (1a) A method for cleaning a die surface, wherein the cleaning is performed on the die.   The die surface cleaning method according to claim 4, further comprising an axial position adjustment handle (9) provided on the external rotating shaft (7).   The die surface cleaning method according to claim 4 or 5, wherein a chain sprocket (14) is provided on the external rotating shaft (7) adjacent to the rotating handle (13).

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