JPH0911310A - Extruder screw cleaning device - Google Patents

Abstract

(57) [Abstract] [Object] The present invention relates to a cleaning device for a screw for an extruder, and a cleaning device that can be easily cleaned by a single worker in a short time without danger even in a high-temperature screw. The purpose is to provide. [Structure] A frame body surrounding the screw (2) with three long rollers (3) arranged in the axial direction of the screw (21) provided on the inner circumference.
(2) and the frame so that the outer circumference fits into the groove of the screw (21).
A rotary brush (4) provided in (2) and driven to rotate, and a frame (2) so as to roll along the front side surface and the rear side surface of the flight (21a) of the screw (21). Guide roller (5)
It consists of and.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw cleaning device for an extruder, and in particular, in a screw type extruder for kneading and extruding materials such as plastic and rubber, the material remaining in the groove of the screw is cleaned and removed. For new improvements for.

[0002]

2. Description of the Related Art In general, screw type extruders for kneading and extruding materials such as plastics and rubber have been increased in size for the purpose of improving productivity and rationalization. It is frequently changed and used. When changing the material, in order to prevent the production of poor quality products with different materials mixed, kneading and mixing from the cylinder inner surface of the screw type extruder and the screw surface until then.
Cleaning is performed to completely remove the residue of material that has been extruded. Conventionally, this cleaning involves stopping the screw extruder, pulling out the screw from the cylinder, removing and cleaning the residual material from the inner surface of the cylinder and the surface of the screw, and confirming that the residue has been completely removed. , A series of steps for inserting the screw into the cylinder. And most of these works are done manually using tools. As for the screw, the material that fills the groove is scraped off with a spatula, and then brushed cleanly.

[0003]

Since the conventional screw cleaning for an extruder has been performed as described above, there have been the following problems. That is, the cleaning work must be completed in a short time in order to improve productivity. The shorter the time it takes to stop the screw extruder during operation, clean it, and start the operation, the shorter the time that does not contribute to production, and the less the temperature drop due to heat radiation from the cylinder and screw, the more the operation starts. The amount of heating at that time is small and the heat loss is also small. However, the temperature of the screw immediately after the operation is stopped is 150 to 200 ° C., and the worker must perform a harsh and dangerous work while receiving high-temperature radiant heat. Further, in order to complete the work in a short time, many workers take charge of some of the screws and perform cleaning work in parallel.

The present invention has been made in order to solve the above problems, and eliminates dangerous work, and allows a single worker to clean a screw in a short time by a screw cleaning device for an extruder. Is provided.

[0005]

SUMMARY OF THE INVENTION An extruder screw cleaning device according to the present invention comprises at least three elongated rollers arranged in the axial direction of the screw and straddling at least two adjacent flights. A frame body provided on the inner periphery to surround the screw, at least one rotating brush provided on the frame body so that the outer periphery is inserted into the groove of the screw and driven to rotate, and a front side surface and a rear side of a flight of the screw. It is composed of at least two guide rollers provided on the frame so as to roll along the side surface.

More specifically, the rotating brush is provided so as to be moved and fixed along a parallel member of the frame body provided in parallel with the axial direction of the screw, and the rotating brush is provided in the axial direction of the screw. The structure is such that it is moved, swung, and fixed along a pillar having a circular cross section that is provided orthogonally.

More specifically, the holding member of the guide roller is provided so as to be rotatable with respect to a shaft hole provided in parallel with the axial direction of the screw.

More specifically, the frame is provided with a release agent coating device.

[0009]

In the extruder screw cleaning apparatus according to the present invention, the frame surrounding the screw rotates around the screw by the three long rollers, and the outer circumference of the long roller has a hard and smooth surface. Therefore, it is possible to easily slide the outer circumference of the screw in the axial direction of the screw, and the rotary brush provided on the frame body remains on the surface including the groove of the screw by being rotationally driven. The material is swept out and removed, and the frame is rotated in the rotation direction of the brush, and the guide roller provided on the frame rotates the frame rotated by the rotation of the brush while following the flight. Further, the rotating brush is moved / fixed along the parallel member and moved / turned / fixed along the vertical member, so that the relative position with respect to the flight of the screw is fixed by the guide roller. The axial position and angle with respect to the flight and the degree of approach to the screw surface are arbitrarily selected and fixed. Further, the guide roller has its holding member pivoted / fixed with respect to the shaft hole, whereby the position of the frame body with respect to the flight can be fixed and released arbitrarily. Further, the release agent coating device provided on the frame moves along the surface of the screw with the rotational movement of the frame.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a screw cleaning device for an extruder according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a front view showing the configuration of the extruder screw cleaning device according to the present invention, and FIG. 2 is a side view in the direction of arrow II in FIG. In the drawing, reference numeral 1 is a cleaning device for an extruder screw (hereinafter abbreviated as a cleaning device), which is configured to surround an extruder screw 21 (hereinafter abbreviated as a screw) indicated by a two-dot chain line. Has been done. That is, at least two adjacent flights 21a of the screw 21 are axially straddled, and four parallel members 2d that are arranged with a gap around the screw 21 and the screws 21 are provided at both ends of the parallel member 2d. The frame body 2 is constituted by two sets of support members 2a having a substantially annular shape that surrounds each other with a gap provided therebetween and fixedly supports the end portion of the parallel member 2d. Further, the support member 2a is divided into two semicircular shapes in the circumferential direction of the screw 21, each of which includes two parallel members 2d, and one divided portion is rotatably coupled by a pin 2b, and the other is divided. Clamp the divided part 2c
Are connected so that they can be separated and opened.

The frame 2 has two sets of the support members 2a.
Three long rollers 3 are rollably provided in parallel with the parallel member 2d. The three elongate rollers 3 are arranged so as to divide the outer periphery of the screw 21 into approximately three equal parts and roll while holding the top of the flight 21a. The number of long rollers is not limited to three, and four or more rollers may be used. Two parallel members 2d of each frame body 2 divided into two
A joint member 6 is spanned in the circumferential direction of the screw 21. The joint member 6 is provided at both ends thereof with slide portions 6a capable of holding the parallel member 2d and slidable, and the slide portion 6a is provided with a fixing lever 6c for integrating with the parallel member 2d. Has been. Further, a pillar 6b having a circular cross section, which is upright in the outer normal direction, is provided at an intermediate portion of the joint member 6. A slide member 7 that holds the support column 6b and is slidable is provided on the support column 6b, and the support member 8 is attached to the slide member 7 via a cushioning material 7a.
Is connected. An air motor 4a is held on the support 8, and the rotary brush 4 is attached to the rotation output shaft of the air motor 4a.
Is provided. The slide member 7 is provided with a fixed lever 7a for integrating with the support column 6b.

The support member 2a of the frame 2 is provided with two guide rollers 5. That is, the support member 2a is formed with a shaft hole 2e that penetrates in the axial direction of the included screw 21 and has an arcuate elongated hole centered on the screw 21, and penetrates the shaft hole 2e and is rotatable. A guide roller 5 that rotates around an axis orthogonal to the holding member 5a is provided at one end of the provided shaft-shaped holding member 5a, and the holding member 5a is integrated with the support member 2a at the other end. A fixed lever 5b is provided for changing the shape. The two guide rollers 5 are arranged at positions separated from each other so as to roll along the front side surface and the rear side surface of the flight 21a of the screw 21 as shown by the solid line and the broken line in FIG. Alternatively, they may be arranged at close positions as indicated by a solid line and a chain line.

A tubular release agent coating device 9 is held on the support 8 so as to be positioned substantially vertically to the surface of the cylindrical screw 21. In order to clean the screw 21 with the cleaning device 1 configured as described above, first, the fixing levers 5b of the two guide rollers 5 are loosened, the holding member 5a is rotated, and the guide shown by the chain line in FIG. It is fixed to the outside of the flight 21a like the roller 5 '. With respect to the screw 21 that is pulled out from the extruder and is supported horizontally and the resin material remains in the groove member, the clamp member 2c is removed and the supporting member 2a, that is, the frame body 2 is divided into two parts with the pin 2b as the center of rotation. Open, screw 2
1 and then clamp 2c is closed. Thereby, the cleaning device 1 includes the screw 21 therein,
The three long rollers 3 are the outer peripheral surface (top) of the flight 21a.
Is provided so as to embrace and is rotatably mounted around the screw 21. Further, since the outer circumference of the long roller 3 is processed into a hard and smooth surface, the friction resistance with the outer circumference of the screw 21 is very small, and the screw 21
Easily slides on the outer periphery of the screw 21 in the axial direction of the screw 21. In this state, the cleaning device 1 moves in the direction opposite to the rotating direction of the rotating brush.
Is manually rotated to wind the air hose 4b connected to the air motor 4a around the cleaning device 1.

Then, the fixing levers 5b of the two guide rollers 5 are loosened and the holding member 5a is rotated to fix the guide rollers 5 along the front and back side surfaces of the flight 21a, respectively. At this time, by selecting an arbitrary position of the arc-shaped elongated hole of the shaft hole 2e and rotating the cleaning device 1 as necessary, the flight 2 along which the guide roller 5 can follow.
It is possible to find the position of 1a. In this state, the relative position of the cleaning device 1 with respect to the screw 21 is determined, and the cleaning device 1 can move while rotating only along the flight 21a. Next, the fixing lever 6c is loosened and the joint member 6 is released.
Is movable in the axial direction of the screw 21 and is fixed to the bar 7
a is loosened so that the slide member 7 can be moved and rotated in the normal direction with respect to the outer surface of the screw 21, and the cleaning position where the outer periphery of the rotating brush 4 reaches the groove bottom of the screw 21 and the angle with respect to the flight 21a are selected and fixed. To do.

In the cleaning device 1 thus assembled in the screw 21, the air motor 4a is passed through the air hose 4b.
When pressurized air is supplied to the rotary brush 4, the rotary brush 4 rotates at a high speed, scraping off and cleaning the resin material remaining on the surface of the screw 21. The rotating brush 4 cleans the surface of the screw 21 and at the same time rotates the cleaning device 1 with respect to the screw 21 by a rotational force. That is, the cleaning device 1 rotates around the screw 21 by the long roller 3 while following the flight 21a by the guide roller 5, and rotates by the rotating brush 4
Always cleans while maintaining the same relative position with respect to the flight 21a. The long roller 3 has a very small frictional force with the flight outer peripheral surface, and the screw 21 rotates while rotating.
It easily slides in the axial direction. Further, when the rotation of the cleaning device 1 on the screw 21 due to the rotation of the rotating brush 4 is weak, the cleaning device 1 can be easily removed by manually pulling the air hose 4b wound around the cleaning device 1 and rewinding it. Is rotated to. The load applied to the rotating brush 4 changes with respect to the resin material remaining irregularly on the surface of the screw 21, but the buffer material 7a interposed between the slide member 7 and the support tool 8 absorbs this load fluctuation. The release agent applying device 9 is equipped with solid stearic acid, and the stearic acid is applied to the surface of the resin material remaining in advance of the rotating brush 4 as the cleaning device 1 rotates, so that the resin material easily tears. It becomes easy to peel off. Therefore, the release agent applying device 9 is disposed in front of the rotating brush 4 in the traveling direction. In the present embodiment, one frame brush 2 divided into two is provided with two rotary brushes 4 in total, but only one of the two frame brushes 2 has one brush, that is, three or more in total. It is also possible to further improve work efficiency. If the air motor 4a can switch the rotation direction, the cleaning device 1 can be rotationally moved in the opposite direction by switching the rotation direction, and the cleaning work can be performed reciprocally. Further, the air motor 4a may be an electric motor or other rotary drive machine.

[0016]

Since the extruder screw cleaning device according to the present invention is configured as described above, the following effects can be obtained. 1. By sending pressurized air, which is a drive source, an automatic cleaning operation by a mechanical device is performed. 2. Even in the case of cleaning a high temperature screw, only the simple work of attaching and detaching the cleaning device and the initial setting is performed manually, and the work in the high temperature environment is almost eliminated, and the risk is greatly reduced. 3. Only the work of attaching and detaching the cleaning device and supplying / stopping the pressurized air was done, and it was an easy task for one person. 4. The cleaning work uses pressure air as a power source and scrapes off the remaining resin material with a rotating brush that rotates at a high speed, so that cleaning can be performed in a short time.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of a cleaning device for a screw for an extruder according to the present invention.

FIG. 2 is a side view in the direction of arrow II in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cleaning device 2 Frame body 3 Long roller 4 Rotating brush 4a Air motor (rotary drive machine) 5 Guide roller 6 Joint member 6b Support 9 Release agent application device 21 Screw 21a Flight

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoru Watada 1-6-1, Funakoshi Minami, Aki-ku, Hiroshima City, Hiroshima Prefecture Japan Steel Works, Ltd.

Claims (4)

[Claims] 1. The screw (21) is provided with at least three long rollers (3) arranged in the axial direction and straddling two flights (21a) adjacent to each other at the shortest, provided on the inner periphery of the screw (21).
The frame (2) surrounding the (21) and the frame so that the outer periphery of the frame (2) fits into the groove of the screw (21).
At least one rotating brush (4) provided in (2) and driven to rotate, and the frame () to roll along the front and rear side surfaces of the flight (21a) of the screw (21). An extruder screw cleaning device comprising at least two guide rollers (5) provided in (2). 2. The rotating brush (4) is provided with the screw (2).
Parallel member of the frame body (2) provided parallel to the axial direction of 1)
It is provided so as to be moved / fixed along (2d), and is also moved / turned / fixed along a pillar (6b) having a circular cross section provided orthogonal to the axial direction of the screw (21). The screw cleaning device for an extruder according to claim 1, wherein 3. A holding member 5a for the guide roller (5).
Is a shaft hole provided parallel to the axial direction of the screw (21).
The screw cleaning device for an extruder according to claim 1 or 2, wherein the cleaning device is provided so as to be rotatable with respect to (2e). 4. The extruder screw cleaning device according to claim 1, wherein the frame body (2) is provided with a release agent coating device (9).