JPH0712637B2 - Screen exchange mechanism attached to the resin extruder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen exchange mechanism attached to a resin extruder for producing a plastic raw material from a new plastic raw material or waste plastic.

[0002]

2. Description of the Related Art Conventionally, as a resin extruder for producing plastic raw materials by treating plastics which are waste materials or new raw materials, for example, molten waste plastics are formed into a die by an extrusion screw provided in a cylinder. A waste plastic is formed linearly through a number of wire drawing holes provided, and then the linear waste plastic is put in a water tank to cool and cut into an appropriate length to obtain a pellet-shaped plastic raw material. There was something to manufacture. Since the waste plastic that is inserted through the die side contains dust, before passing through the die, a mesh screen for dust removal is attached to a frame body that is slidably movable in the lateral direction. I was trying to remove it. However, since the dust clogs the screen and makes it difficult to smoothly manufacture the plastic raw material, the frame body is periodically moved in the lateral direction, and the screen is exchanged for cleaning.

[0003]

However, when the frame body is attached to the front portion of the cylinder of the resin extruder so that the frame body can be slidably moved, a gap is generated between the front portion of the cylinder and the frame body. However, there is a problem that the resin leaks during extrusion from this portion. Therefore, a gap adjusting mechanism using an adjusting screw is provided at the tip of the cylinder to adjust the gap. However, there is a problem that it is very troublesome and troublesome for an operator to manually adjust.
The present invention has been made in view of such circumstances, and by a simple operation, the melted plastic does not leak outside from the middle of the resin extruder at the time of use, and the plastic dust can be easily removed without trouble. It is an object of the present invention to provide a screen exchange mechanism attached to a resin extruder capable of exchanging or cleaning a cleaning screen.

[0004]

A method according to the above-mentioned object.
The screen exchanging mechanism attached to the resin extruder described in the above is a block frame body mounted via a mounting bracket to a tip portion of a cylindrical body provided with a rotationally driven screw, and slidably mounted on the block frame body. , A resin extruder having a sliding frame provided with a die for extruding and forming a resin in a linear shape at a front end thereof, and a screen detachably provided in front of the die of the sliding frame. Is a screen exchange mechanism attached to the above, and comprises a heater and a cooler, one end of which is fixed to the mounting metal member, and the other end of which is slidably in contact with the sliding frame. Here, the expansion / contraction member is a material that uses a metal having a relatively large thermal expansion coefficient and that expands or contracts when the temperature changes, for example, a material that uses a material such as aluminum.

[0005]

In the screen exchanging mechanism attached to the resin extruder according to claim 1, when the screen exchanging mechanism is used, the heater of the expansion / contraction member is activated in advance to expand the expansion / contraction member, and the gap between the sliding frame and the expansion / contraction member is increased. To lose. Then, the screw of the cylindrical body is rotated, and the melted plastic is fed into a die provided in a sliding frame fixed to the block frame through a screen. At this time, since there is no gap between the sliding frame and the expansion / contraction member, the plastic does not leak from the middle. Then, the plastic removes dust mixed by the screen, and is extruded to the outside through a die to become a linear plastic raw material. Furthermore,
When the screen exchange mechanism attached to the resin extruder is used for a certain period of time, dust adheres to the screen and becomes clogged,
It is necessary to replace or clean the screen on a regular basis as it makes it difficult to produce a smooth plastic material. Therefore, the heater is stopped, the cooler of the expansion / contraction member is operated to contract the expansion / contraction member, a gap is formed between the expansion frame and the sliding frame, and then the sliding frame is slid to perform the sliding operation. This is done by removing the screen from the frame.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. 1 is a plan sectional view of a screen exchange mechanism attached to a resin extruder according to an embodiment of the present invention, FIG. 2 is a front sectional view thereof, and FIG. 3 is a side sectional view thereof. As shown in FIGS. 1 to 3, a screen exchange mechanism 10 attached to a resin extruder according to an embodiment of the present invention includes a cylinder 11 which is an example of a cylinder.
The fitting 12 connected to the cylinder 11, the pushing screw 13 loaded inside the fitting 12 and the cylinder 11, the expansion / contraction member 14 provided at the tip of the fitting 12, and the fitting 12 are fixed. Block frame 1
5 and a sliding frame 16 slidably provided on the block frame body 15.

The cylinder 11 and the mounting bracket 12 are fixed by a mounting screw 18 via a flange 17, and the mounting bracket 12 is fixed by a fixing bolt 19 in a block frame body 15.
And a screw hole 20 communicating with the cylinder 11 is formed on the inner side of the screw hole 20.
3 can be mounted inside the cylinder 11 and the mounting bracket 12 in a communicating state. The block frame body 15 is provided with a cavity that penetrates in the axial direction of the cylinder 11 inside, and the expansion / contraction member 14 and the adjusting screw 31 can be provided inside. In addition, sliding grooves 21 and 22 are formed at the top and bottom of the block frame body 15 so as to laterally penetrate both side surfaces of the block frame body 15. The rotation stopper bolt 23 is provided at the top and the stand is provided at the bottom. 26 is fixed. Heater mounting holes 24, 25 are formed in the mounting member 12, and the heater mounting holes 24,
A plurality of cylindrical heaters 27 and 28 are attached to 25 to prevent the molten waste plastic from solidifying. Further, a screw groove 30 is formed on the outer side of the front end of the mounting member 12, and a ring-shaped adjusting screw 31 is screwed into the screw groove 30, so that the arrangement position of the expansion / contraction member 14 can be adjusted. There is. The adjusting screw 31 and the expansion / contraction member 14 are attached to the mounting screw 32.
It is fixed in. The expansion / contraction member 14 is formed of aluminum having a large coefficient of thermal expansion in a substantially donut shape, and the inside thereof is formed in a donut shape by a copper pipe on the outside.
And a cooler 34, and a ring-shaped contact ring 35 made of wear-resistant cemented steel is attached to the tip. A cord 36 for electric heating is connected to the heater 33, and a cooling water inlet 37 and a drain port 3 are connected to the cooler 34.
8 is provided so that the expansion / contraction member 14 can be warmed and expanded by the heater 33, and cooling water can be circulated through the cooler 34 to be cooled and contracted. Also, heater 3
3 and the periphery of the cooler 34 are shielded by a filler. A thermocouple 43 is attached to the expansion / contraction member 14 so that the temperature can be measured.

Sliding grooves 21, 2 of the block frame body 15
A sliding frame 16 is fitted into the sliding member 2 to enable lateral movement thereof. The sliding frame 16 is slidably fixed to the block frame body 15 via a guide 39, and a screen 40 is arranged inside thereof. A die 42 is fixed to the front of the screen 40 via a plate 41. The tip of the hydraulic cylinder 44 is connected to the side end of the sliding frame 16 by a connecting pin 45. Hydraulic cylinder 4
4 is fixed to the side wall of the block frame body 15 and moves the sliding frame 16 laterally. A plurality of stopper bolts 46 for setting the moving distance of the sliding frame 16 are provided on both side surfaces of the block frame body 15. The screen 40 has a mesh shape and is formed in a circular shape so as to remove dust mixed in the waste plastic material which is melted. Also,
The plate 41 is provided with a large number of holes, the die 42 is formed with a large number of holes 47 communicating with the holes, and the melted waste plastic passes through the holes 47 to form the waste plastic in a linear shape. Is able to.

Next, a method of using the screen exchange mechanism 10 attached to the resin extruder will be described. To use the screen exchange mechanism 10 attached to the resin extruder, the arrangement position of the expansion / contraction member 14 is adjusted in advance. For the adjustment, loosen the rotation stop bolts 23 of the block frame body 15 to attach the mounting bracket 1
The adjusting screw 31 of No. 2 is rotated together with the expansion / contraction member 14, and the contact ring 35 and the sliding frame 16 are moved so that the sliding frame 16 can move laterally.
In the meantime, a gap is formed in the state where the expansion / contraction member 14 is cooled by the cooler 34. When the adjustment is completed, the anti-rotation bolt 23 is tightened, and the expansion / contraction member 14 during operation of the screen exchange mechanism 10 attached to the resin extruder is tightened.
Prevent the rotation of. After the position adjustment of the expansion / contraction member 14 is completed, the tubular heaters 27 and 28 are operated to operate the mounting bracket 12.
To prevent the waste plastic moving by the extrusion screw 13 from solidifying. On the other hand, the heater 33 of the expansion / contraction member 14 is operated to expand the expansion / contraction member 14 by thermal expansion, and the gap between the contact ring 35 and the sliding frame 16 is eliminated. In this state, the extrusion screw 13 is rotated and the melted waste plastic is poured into the cylinder 11 to advance the waste plastic. The advancing waste plastic is cleaned of dust that has entered during passage through the screen 40. At this time, since the expansion / contraction member 14 is expanded by the heater 33, the expansion / contraction member 14 is expanded.
There is no gap between the contact ring 35 and the contact ring 35, and the waste plastic does not leak outside.

The waste plastic that has passed through the screen 40 is linearly formed through the holes of the plate 41 and the holes 47 of the die 42, and then cooled in a water tank and cut into an appropriate length. It is a raw material for plastics. Screen exchange mechanism 1 attached to the resin extruder
When 0 is used for a certain period of time, the mesh of the screen 40 is clogged with dust, which makes it difficult to smoothly manufacture a plastic raw material. Therefore, the screen 40 is regularly replaced or cleaned. For replacement and cleaning of the screen 40, the rotation of the extrusion screw 13 is stopped and the heater 3 of the expansion / contraction member 14 is changed.
3 is stopped, cooling water is injected into the cooler 34 through the cooling water inlet 37, and the expansion / contraction member 14 is contracted. Expansion / contraction member 1
Due to the contraction of No. 4, a gap is formed between the expansion / contraction member 14 and the contact ring 35, and the sliding frame 16 can move along the sliding grooves 21 and 22. The movement of the sliding frame 16 is performed by extending the hydraulic cylinder 44. Screen 40 moved laterally from the front of the extrusion screw 13
Is removed from the sliding frame 16 and a new screen 40,
Screen 40 cleaned by removing clogged dust
Replace with.

As described above, since the expansion / contraction member 14 is formed by using aluminum having a large coefficient of thermal expansion and the heater 33 and the cooler 34 are provided inside, the screen exchanging mechanism 10 attached to the resin extruder is installed. During operation, expansion / contraction member 1
The melted waste plastic does not leak from the joint between the abutment ring 35 of No. 4 and the sliding frame 16 and the screen 40 can be easily replaced or cleaned without any trouble.

In the present embodiment, the mounting member 12 and the cylinder 11 are provided in series, but the mounting member and the cylinder of the screen replacement mechanism attached to the resin extruder according to the present invention should be integrally formed. Is also possible. Although aluminum is used as the material of the expansion / contraction member 14, other metal materials may be used. Although the heater 33 is formed of a copper pipe, another type of heater such as a band heater may be used to warm the expansion / contraction member 14. Although waste plastics are used as a raw material in the above embodiment, the present invention is also applicable to the case where a new plastic or a mixture of a new plastic and a waste plastic is used as a raw material.

[0013]

As is apparent from the above description, the screen exchanging mechanism attached to the resin extruder according to claim 1 is provided with the expansion / contraction member including the heater and the cooler. Can be sealed by the heater so that the melted plastic raw material does not leak outside during operation. When replacing or cleaning the screen, it is possible to replace or clean the screen by contracting the expansion / contraction member with a cooler to make a gap with the sliding frame and moving the sliding frame. Therefore, it is possible to easily replace the screen by operation.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a screen exchange mechanism attached to a resin extruder according to an embodiment of the present invention.

FIG. 2 is a front sectional view of the same.

FIG. 3 is a side sectional view of the same.

[Explanation of symbols]

 10 Screen Exchanging Mechanism Attached to Resin Extruder 11 Cylinder (Cylinder) 12 Mounting Fitting 13 Extrusion Screw 14 Expansion / Contraction Member 15 Block Frame 16 Sliding Frame 17 Flange 18 Mounting Screw 19 Fixing Bolt 20 Screw Hole 21 Sliding Groove 22 Groove for sliding 23 Non-rotating bolt 24 Heater mounting hole 25 Heater mounting hole 26 Stand 27 Cylindrical heater 28 Cylindrical heater 30 Screw groove 31 Adjusting screw 32 Mounting screw 33 Heater 34 Cooler 35 Contact ring 36 Cord 37 Cooling Water Inlet 38 Drain 39 Guide 40 Screen 41 Plate 42 Die 43 Thermocouple 44 Hydraulic Cylinder 45 Connecting Pin 46 Stopper Bolt 47 Hole

Claims (1)

[Claims] 1. A block frame body mounted via a mounting bracket to a tip portion of a cylindrical body having a screw that is driven to rotate, and a block frame body slidably mounted on the block frame body, and a resin line is attached to the tip portion. A screen exchanging mechanism attached to a resin extruder having a sliding frame provided with a die that is extruded into a circular shape, and a screen that is detachably provided in front of the die of the sliding frame. A screen exchanging mechanism attached to a resin extruder, comprising a heater and a cooler, one end of which is fixed to the mounting member and the other end of which is in sliding contact with the sliding frame.