JPH06328542A - Internal resin removing device for cylinder of extruder - Google Patents

Abstract

PURPOSE:To provide an internal resin removing device for a cylinder of an extruder for which labor is not required for the operation and a working space to be provided outside the cylinder is not required. CONSTITUTION:The tip of a cleaning tool 5 is brought into contact with the inner wall of a cylinder 1 of an extruder and resin 10 adhered to the inner wall of the cylinder 10 is removed by an internal resin removing device for the cylinder 1 of the extruder, which is driven by the cleaning tool 5 and screw driving source 3 for the extruder and provided with a screw jack 6 for moving the cleaning tool 5 in the axial direction of the cylinder 1 and a control mechanism 7 for sensing that the cleaning tool 5 reaches the front and rear ends of the cylinder 1 and reversing the moving direction of the cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal resin removing device for an extruder cylinder. For example, after the cross-linked polyethylene is extruded by a single-screw extruder and the screw is removed from the cylinder, the cross-linked polyethylene adheres to the inside of the cylinder. It is used to remove polyethylene resin.

[0002]

2. Description of the Related Art Conventionally, the work of removing the resin remaining on the inner wall surface of the cylinder after the extruding work is performed, for example, as follows. That is, as shown in FIG. 4, a cylindrical wire brush 21 is attached to a rod 23 having a length of at least the cylinder 22.
The rod 23 is attached to a rotatable device 24 (for example, a hand drill), and the worker repeatedly reciprocates the rotating wire brush 21 in the longitudinal direction of the cylinder 22 to attach it to the inner wall surface of the cylinder 22 and leave it. The remaining resin.

[0003]

However, the conventional resin removing method for the inner wall surface of the cylinder has the following problems. That is, 1) it takes a lot of time and labor to remove the resin, and when the resin gelates due to some heat history such as extruded resin like cross-linked polyethylene, the resin adheres firmly to the cylinder. And requires a great deal of work. 2) Since a worker carries out a reciprocating movement with a rotating device, a work space of about the same length as the cylinder is required on one side of the cylinder.

[0004]

SUMMARY OF THE INVENTION The present invention provides an internal resin removing device for an extruder cylinder that solves the above-mentioned problems, in which the tip of a cleaning tool is brought into contact with the cylinder inner wall of the extruder so that An internal resin removing device for an extruder cylinder that removes adhering resin, a cleaning tool, and a screw jack driven by a screw driving force source of the extruder to move the cleaning tool in an axial direction of the cylinder, and It is characterized by comprising a control mechanism for detecting that the cleaning tool has reached the front and rear ends of the cylinder and reversing the moving direction thereof.

[0005]

In the internal resin removing device for the extruder cylinder described above, with the tip of the cleaning tool in contact with the inner wall surface of the cylinder,
The cleaning tool is attached to a screw jack driven by a screw driving force source of the extruder. This cleaning tool is moved in the cylinder longitudinal direction by the screw jack, and at the front and rear ends of the cylinder, the control mechanism detects the cylinder end and reverses the moving direction of the cleaning tool. Or later,
This reciprocating movement is repeated to remove the resin adhering to the inner wall surface of the cylinder. Therefore, using the device of the present invention,
No manpower is required for resin removal work. Further, since the device does not come out of the cylinder during the work and there is no work outside the cylinder, it is not necessary to provide a work space outside the cylinder.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is an explanatory view of an embodiment of an internal resin removing device for an extruder cylinder according to the present invention. In the figure, for the extruder body, 1 is an extruder cylinder, 2
Is a speed reducer of the extruder, 3 is a power source for driving the screw of the extruder, and 4 is an operation / control device of the extruder. Further, regarding the internal resin removing device, 5 is a cleaning tool composed of a wire brush formed in a cylindrical shape so that the tip of the wire is in contact with the inner wall of the cylinder 1, and 6 is a power source 3 that moves the cleaning tool 5 in the longitudinal direction of the cylinder 1. Screw jack for moving through the speed reducer 2 by means of 7, a cylinder end detecting device 7 and a cylinder end detecting device 7 and an operation / control device 4
Reference numeral 9 denotes a connector for connecting with, and 9 denotes a non-rotating fixing support for supporting the rotating screw jack 6, and 10 denotes resin that remains attached to the inside of the cylinder 1.

The resin removing work in the cylinder 1 is carried out as follows using the above-mentioned apparatus. For example, length 5
After extruding the cross-linked polyethylene with a 150 mm extruder having a cylinder 1 of m, the cross-linked resin adheres to the inner wall of the cylinder 1 and the work procedure for removing it is as follows. That is, 1) First, the present resin removing apparatus is set in the cylinder 1 in the same manner as the procedure for inserting the resin extruding screw. 2) Next, the connector 8 and the operation / control device 4 are connected. 3) In the screw rotation direction (normal rotation) during resin extrusion,
The rotation speed of the screw jack 6 is 25 rpm, and the moving speed of the cleaning tool 5 is 1 m / min. Then, the cleaning tool 5 moves from the speed reducer 2 side toward the tip of the cylinder 1 while removing the residual resin. When the cleaning tool 5 reaches the cylinder end detection device 7 on the front end side of the cylinder 1, the screw rotation direction of the screw driving power source 3 rotates in the reverse direction (reverse rotation), and the cleaning tool 5 reverses to the speed reducer 2 direction at the same speed. To move. 4) In this way, normal / reverse rotation is repeated, and the cleaning tool 5 is reciprocated, for example, 6 times to remove the residual resin. The time required for one round trip is 10 minutes, and therefore this work requires about 1 hour. This required time is about the same as when the conventional manual work is performed.

In the above work, the resin is removed mainly by the reciprocating motion of the cleaning tool 5 as in the conventional case. During the reciprocating motion, the wire brush of the cleaning tool 5 may slightly rotate depending on the change of the resin adhesion state, and the same wire brush surface always contacts the same inner wall surface of the cylinder 1 to move. Not necessarily. Therefore, the resin is removed more effectively than in the case of a simple reciprocating motion.

FIG. 2 is an explanatory view of the cleaning tool 5 composed of the wire brush used in the above embodiment. The cleaning tool 5 is the boss 1.
The wire brush 12 is attached around 1. The boss 11 is threaded at its center so that it can be engaged with the screw jack 6 and moved. The outer diameter of the wire brush 12 is 5 than the inner diameter of the cylinder 1.
It is made larger by about 10 mm, and a state in which the wire brush 12 is slipped and rotated only when the wire brush 12 is not worn to avoid movement in the cylinder 1 axis direction is avoided. When the usage time becomes long and the wire brush 12 is worn and the resin removing ability and the mobility in the cylinder 1 axis direction are deteriorated, the wire brush 12 and the boss 11 are replaced.

The cleaning tool is not limited to the above-mentioned embodiment, and for example, as shown in FIG. 3, the boss 11 is threaded so that it can be moved in mesh with the screw jack at the center.
And a reamer-shaped blade shape 13 (straight type or spiral type) for drilling, which is a general cutting tool, may be provided on the outer peripheral portion in contact with the cylinder. The outer diameter of the blade is the same as the inner diameter of the cylinder or approximately 2
If it is reduced to about mm, it is effective for the residual resin removing ability and the mobility in the cylinder axial direction. The shape of the blade may be a tap shape (straight type or spiral type) for drilling a screw hole.

A feature of the present invention is that the power source for driving the screw of the extruder main body is used as it is. Therefore, it is necessary to mesh the sleeve, which is the power transmission portion inside the reduction gear, with the shank portion of the present device. In other words, it goes without saying that the shank portion of this device and the shank portion of the resin extruding screw have the same shape and size.
The cylinder end detection device is not limited to a specific device, and may be a contact type or a non-contact type. Further, the structures of the connector for connection and the support for non-rotational fixing are not limited to particular ones.

[0012]

As described above, according to the present invention, an internal resin removing device for an extruder cylinder is provided which removes the resin adhering to the inner wall of the cylinder by bringing the tip of the cleaning tool into contact with the inner wall of the cylinder of the extruder. There, a cleaning tool and a screw jack driven by the screw driving force source of the extruder to move the cleaning tool in the axial direction of the cylinder,
Since it has a control mechanism that detects that the cleaning tool has reached the front and rear ends of the cylinder and reverses the direction of movement, it does not require manpower for the work, and a work space needs to be provided outside the cylinder. There is an excellent effect that it disappears.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of an internal resin removing device for an extruder cylinder according to the present invention.

FIG. 2 is an explanatory diagram of a cleaning tool used in the above embodiment.

FIG. 3 is an explanatory view of another embodiment of the cleaning tool.

FIG. 4 is an explanatory view of a conventional resin removing device for an extruder cylinder.

[Explanation of symbols]

 1 Cylinder 2 Reduction Gear 3 Power Source 4 Operation / Control Device 5 Cleaning Tool 6 Screw Jack 7 Cylinder End Detection Device 8 Connector 9 Non-Rotation Fixed Support 10 Resin 11 Boss 12 Wire Brush 13 Blade Type

Claims (1)

[Claims] 1. An internal resin removing device for an extruder cylinder, which comprises removing the resin adhering to the inner wall of the cylinder by bringing the tip of a cleaning tool into contact with the inner wall of the cylinder of the extruder,
A cleaning tool and a screw jack that is driven by a screw driving force source of an extruder to move the cleaning tool in the axial direction of the cylinder, and a moving direction of the cleaning tool that detects that the cleaning tool reaches the front and rear ends of the cylinder. An internal resin removing device for an extruder cylinder, which is provided with a control mechanism for reversing.