JPH04126833U - Gas venting equipment such as extruders - Google Patents

Abstract

(57) [Summary] [Configuration] A decoupling cylinder 1 is installed on the upper outer periphery of the cylinder 4 of the extruder 2.
Set 0. A rotary vane 18 made of a Teflon resin sheet is installed in the decapitalization cylinder 10 so that the tip of the rotary vane 18 rotates while contacting the inner surface of the decapitation cylinder 10. A vibrator 7 that vibrates the rotary blade 14 is attached. [Effect] Since the tip of the rotary vane 14 rotates while contacting the inner surface of the desorption cylinder 10, material adhering to the inner surface of the desorption cylinder 10 is scraped off. Further, since a vibrator 7 that vibrates the rotary blade 18 is attached, material that could not be scraped off by the rotary blade 18 is shaken off by the vibration of the vibrator 7. Therefore, the material in this degassed cylinder 10 will not be carbonized, and no carbonized material will be mixed into the product.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a degassing device such as an extruder or a continuous kneader.

0002

[Conventional technology]

Extruders and continuous kneading machines have a rotor located in a cylindrical space formed inside a cylinder. The material is kneaded in the process of being transferred by this rotor, and the kneaded material is The material is injected into an injection mold or extruded from an extrusion die. Ru.

0003 In this case, gas may be generated from the material during transfer by the rotor, or the material may If gas is mixed into the product, air bubbles may form in extrusion or injection molded products. The product is defective.

0004 Therefore, in extruders, etc., the gas generated from the material and the gas mixed in the material are A degassing device is installed to remove gas. Generally, this type of degassing device has a degassing cylinder installed on the upper outer periphery of the cylinder. The material in the cylinder is removed by vacuum suction from this decylinder. It is designed to remove gas.

[0005] However, when vacuum is drawn from the deducted cylinder, the material in the cylindrical space of the cylinder is removed from the deducted cylinder. It gets inside the. Therefore, the degassing device has a return section inside the degassing cylinder. The return member is used to return the material that has entered the desorption cylinder to the cylindrical space. I'm doing it.

[0006] As a conventional degassing device equipped with such a return member, for example, No. 3-25129 or JP-A No. 63-199423. There is a degassing device.

[0007] In the former degassing device, the return member is equipped with multiple screws, each with a Each screw is connected to a drive gear located above the decylinder, and the drive By rotating each screw with a gear, it entered the inside of the decylinder. The material is returned to the cylindrical space of the cylinder.

[0008] In addition, in the latter gas venting device, the return member is provided with a piston, and this piston The stone is moved up and down by a drive cylinder placed above the de-cylinder. In this way, the material that has entered the desorption cylinder is returned to the cylindrical space.

[0009]

[Problem that the idea aims to solve]

In the former type of degassing device using a screw, the inner wall of the degassing cylinder and the screw There is an unavoidable minute gap between the For this reason, the material adhering to the inner wall of the degassed cylinder The material cannot be completely pushed back with the screw. Adheres to this minute gap The material is gradually carbonized by the heat applied for kneading. And this There is a risk that carbonized material may fall into the cylinder and become mixed with the material, impairing product quality. There is.

0010 In addition, in the latter type of degassing device using a piston, the gas adheres to the inner wall of the degassing cylinder. The removed material can be almost completely removed and pushed back into the cylindrical space, but the piston When the cylinder moves to the tip on the side of the cylindrical space, the decylinder is blocked by the piston, It becomes impossible to degasse. Therefore, when the piston moves to the tip and when it moves to the rear, There was a problem in that the deaeration state varied depending on when the pump was moved.

[0011] This invention was devised in view of the above-mentioned problems. An extruder that can prevent material from adhering to the inner wall of the desorption cylinder. The purpose is to provide a degassing device such as.

0012

[Means to solve the problem] This invention was made to achieve the above purpose, and a cylindrical space is formed inside. A cylinder in which a material transfer rotor is installed in this cylindrical space, and this cylinder A push cylinder is provided on the outer periphery of the upper part of the cylinder, and a part of the cylinder is opened into the cylindrical space. In a degassing device such as a degassing device, the tip of the degassing cylinder is made of a heat-resistant elastic sheet. The rotary vane is installed so that the tip of the rotary vane rotates while touching the inner surface of the desorption cylinder. It is equipped with a vibrator that vibrates the rotating blades.

[0013] In this invention, the vibrator that vibrates the rotating blade is attached to the rotating shaft of the rotating blade. , you can vibrate this rotating shaft to vibrate the rotating blades, or you can place a vibrator near the rotating blades. A vibrator may be attached to transmit the vibrations of the vibrator to the rotating blades. Alternatively, a vibrator may be attached to the rotating blade to vibrate the rotating blade.

[0014]

[Effect]

In this invention, the rotating blade whose tip is made of a heat-resistant elastic sheet is The tip is attached so that it rotates while touching the inner surface of the desorption cylinder, so it is easy to remove. The material adhering to the inner surface of the cylinder is scraped off by the rotating blades, forming a cylindrical shape. Return to space. At this time, since the rotating blade is a heat-resistant elastic sheet, it is processed for kneading. It does not change in quality due to the heat generated, and it adheres tightly to the inner surface of the decoupling cylinder due to its elasticity. It rotates in the same position.

[0015] In addition, as mentioned above, the heat-resistant elastic sheet scrapes off the material adhering to the inner surface of the desorption cylinder. However, there are still some materials that cannot be completely scraped off, and there is also material on the rotating blades. However, in this invention, a vibrator that vibrates the rotating blade is attached. This vibrator removes any remaining material or circulation from the inside of the desorption cylinder. The material adhering to the rolling blades is shaken off, and the material returns to the cylindrical space.

[0016] In this way, the material that adheres to the desorption cylinder and rotating blades immediately returns to the desorption cylinder, so the desorption Materials do not carbonize inside the cylinder. Therefore, carbonized material falls into the material. Never.

[0017]

【Example】

Embodiments of the present invention will be described below with reference to the drawings. Figures 1 to 3 show an embodiment of the present invention, and Figure 1 shows the use of the gas venting device of the present invention. A partially cutaway front view showing the extruder shown in Figure 2, cut along line A-A of the extruder shown in Figure 1. FIG. 3 is a cross-sectional view of the extruder shown in FIG. 1 taken along line BB.

[0018] In the figure, 2 is an extruder. 4 is the extruder 2 whose axis is oriented almost horizontally. It is a cylinder, and a cylindrical space 6 is formed inside this cylinder 4 . 8 is a rotor, and this rotor 8 is rotatably provided in the cylindrical space 6. Ru. By rotating this rotor 8, the material in the cylindrical space 6 (see Fig. (not shown) is adapted to be transferred from right to left in FIG.

[0019] 36 is a vacuum pipe, and the tip of this vacuum pipe 36 is connected to a not-illustrated true It is connected to an empty device, and the inside of the vacuum tube 36 is evacuated by this vacuum device. There is.

[0020] 12 is a housing, and this housing 12 is connected to the vacuum pipe 36. , the inside of this housing 12 is evacuated. 10 is a decylinder, and the lower end of this decylinder 10 is connected to the upper outer periphery of the cylinder 4. It opens into the cylindrical space 6. Also, the upper end of this decylinder 10 is connected to this housing. The cylindrical cavity is connected to the bottom of the housing 12 and is opened in the housing 12. The material in the gap 6 is degassed.

[0021] 3 and 31 are sealing materials, and this sealing material 3 is used to seal the vent cylinder 10 and the housing 1. 2, making the connection here airtight. Also, the sealing material 31 is degassed. It is provided between the pipe and the cylinder 4 to make the connection here airtight.

[0022] 13 is a return member, and this return member 13 is connected to the rotating shaft 14 and to this rotating shaft 14. It consists of an attached rotating blade 18. This return member 13 is connected to the decylinder 10. The material that has entered the desorption cylinder 10 from the cylindrical space 6 is removed into a cylindrical shape. It is meant to be returned to the space.

[0023] The rotating shaft 14 is arranged coaxially with the degassing cylinder 10, and the lower end of the rotating shaft 14 is connected to the degassing cylinder 10. A slit 16 extending in the axial direction is inserted into the inside of the cylinder 10, and a slit 16 extending in the axial direction is provided on the lower end surface. It is formed.

[0024] This slit 16 is made of a heat-resistant elastic sheet (Teflon resin sheet). A rotating blade 18 and a holding plate 20 that holds the rotating blade 18 by sandwiching it from both sides are inserted. has been done. The rotating blade 18 and the pressing plate 20 are rotated by screws 22. It is fixed to the rotating shaft 14.

[0025] The width of the rotary vane 18 is slightly larger than the inner diameter of the decylinder 10, and Due to its own elasticity, both ends of the rotating shaft 1 are in contact with the inner surface of the decoupling cylinder 10. It rotates around 4.

[0026] 28 is a motor, and this motor 28 is mounted on the top surface of the lid 34 of the housing 12. It is attached so that the force shaft 30 coincides with the axis of the desorption cylinder 10. On the other hand, lid 3 A bearing 24 is airtightly attached to the lower surface of 4 via a seal rubber (silicone rubber) 35. is attached. The rotating shaft 14 is airtightly supported via a seal 26. , the upper end of the rotating shaft 14 is connected to the output shaft 30 of the motor 28 by a split pin 32. ing.

[0027] 7 is a vibrator, and this vibrator 7 is attached to the lower surface of the bearing 24. The rotating shaft 14 is vibrated through the connecting rod 71, and this vibration causes the rotating blades 18 to vibrate. starts to vibrate.

[0028] Next, while referring to an example using vinyl chloride resin powder as the material, This section explains how to operate the device and how it works. First, vinyl chloride resin powder is transferred from a hopper (not shown) to a cylinder inside the cylinder 4. It is dropped into the shaped space 6. This fallen vinyl chloride resin powder rotates inside cylinder 4. It is transferred in the distal direction by the screw 8 that is

[0029] There is a lot of air mixed into the vinyl chloride resin powder, but inside the cylinder 4. During the transfer, this air passes through a decoupling cylinder 10 provided on the upper outer periphery of the cylinder 4; After passing through the housing 12 and the vacuum exhaust pipe 36, a vacuum device (not shown) The air in the vinyl chloride resin powder gradually disappears as it is sucked dry.

[0030] At that time, a part of the vinyl chloride resin powder is sucked into the desorption cylinder 10 along with the air. Most of the sucked vinyl chloride resin powder adheres to the inner surface of the desorption cylinder 10. However, since the rotary blade 18 rotates while contacting the inner surface of the desorption cylinder 10, this The adhering vinyl chloride resin powder is scraped off by the rotating blades 18 and left inside the cylindrical space 6. to fall.

[0031] However, it is not possible to completely scrape off the vinyl chloride resin powder that has adhered to the inside of the desorption cylinder 10. It cannot be removed and a small amount remains attached. In addition, a small amount of the sucked vinyl chloride resin powder is transferred to the rotating shaft 14, the pressing plate 20, and the rotating shaft. It adheres to the surface of the rolling blade 18.

[0032] A trace amount of vinyl chloride resin powder that adhered to the inner surface of the de-cylinder 10 and the rotating shaft 1 A small amount of vinyl chloride resin powder adhering to the bearing 2, the holding plate 20, and the rotating blade 18 The rotary blade 18 is vibrated by the vibrator 7 attached to the lower surface of the rotary blade 4. It is shaken off by this vibration and falls into the cylindrical space 6 inside the cylinder 5 again. .

[0033] In this way, the vinyl chloride resin powder adhering to the inside of the desorption cylinder 10 is immediately absorbed into the cylindrical space. 6, the vinyl chloride resin powder will not be carbonized. When the vinyl chloride resin powder further advances inside this cylinder 4, it A heating device attached to the wall softens the PVC resin powder and allows it to be manufactured from the mold. It becomes a product and is pushed out.

[0034]

[Effect of the idea]

As is clear from the above explanation, in the degassing device of the present invention, the tip of the rotating vane is inside the degassing cylinder. Since it rotates while contacting the surface, material adhering to the inner surface of the desorption cylinder is scraped off.

[0035] In addition, the degassing device of this invention is equipped with a vibrator that vibrates the rotating blades. Then, use a vibrator to remove the material that could not be scraped off by the rotation of the rotating blades. It can be shaken off by vibrating it.

[0036] Is the material that adheres to the inner surface of the desorption cylinder immediately dropped into the cylindrical space? The material will not carbonize. Therefore, carbonized materials may be mixed into the product. There is no risk of compromising product quality.

[0037] Also, since this invention does not use a piston, etc., there is no variation in the deaeration state inside the degassing cylinder. Does not occur. Therefore, the degassing in the material is carried out smoothly and air is mixed into the product. Never.

[0038] As mentioned above, this invention has many advantages and is extremely valuable. .

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing the vicinity of the degassing device of an extruder using the degassing device of the present invention.

FIG. 2 is a cross-sectional view of the extruder shown in FIG. 1 taken along line AA.

FIG. 3 is a cross-sectional view of the extruder shown in FIG. 1 taken along line BB.

[Explanation of symbols]

2 Extruder 4 cylinder 6 Cylindrical space 7 Vibrator 8 Rotor 10 De-cylinder 13 Return member 14 Rotation axis 18 Rotating feather

Claims (1)

[Scope of utility model registration request] 1. A cylinder having a cylindrical space formed therein and a material transfer rotor provided in the cylindrical space, and a vent provided on the upper outer periphery of the cylinder and partially opening into the cylindrical space. In a degassing device such as an extruder comprising a cylinder, a rotary blade whose tip is made of a heat-resistant elastic sheet is installed in the degassed cylinder so that the tip of the rotary blade rotates while contacting the inner surface of the degassed cylinder, A degassing device for an extruder or the like, characterized by being equipped with a vibrator that vibrates the rotating blades.