JP2508217Y2 - Extruder cylinder - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extruder cylinder.

[0002]

2. Description of the Related Art Two conventional extruders that enable internal observation
Axial cylinders include those shown in FIGS. 5 and 6. The twin-screw cylinder of the extruder shown in this figure is a semi-cylindrical upper half cylinder 50 and a semi-cylindrical lower half cylinder 5.
2, cover 60, cover 62, etc.,
The fastening bolts 56 and 58 are integrated. In a state where the biaxial cylinder of the extruder is assembled, a biaxial screw (not shown) is rotatably mounted in the biaxial cylinder hole. The biaxial screw is adapted to be rotationally driven by a motor (not shown). During the melting and kneading of the molten material by driving the twin screw, the rotation of the twin screw is stopped and the fastening bolt 56
The upper half cylinder 50 is rotatable in the opening direction with the two hinges 54 as the rotation centers in a state in which the and 58 are loosened. Note that FIG. 6 shows a state in which the upper half cylinder 50 is located at the open position. In this state, the molten and kneaded state of the molten material in the biaxial cylinder can be observed.

[0003]

However, in the conventional semi-cylindrical division type cylinder as described above, during melting and kneading, the molten material in the cylinder does not leak from the cylinder joint surface to the outside of the cylinder due to the internal pressure. In order to do so, it is necessary to provide a large number of fastening bolts. In order to observe the molten and kneaded state of the molten material in the cylinder as close as possible to the operating state, it is necessary to disassemble the cylinder immediately after stopping the screw, but loosen many fastening bolts. However, there is a problem in that it is difficult to accurately grasp the state of the molten material in the cylinder. The present invention aims to solve the above problems.

[0004]

DISCLOSURE OF THE INVENTION The present invention does not divide a cylinder into two semi-cylindrical parts, but forms an observation hole in the wall of the cylinder and can fit the observation hole in an airtight manner. And a plug member drive device for driving the plug member so that the plug member moves between the fitting position and the detaching position away from the fitting position. That is, the cylinder (1
0) penetrates the outer peripheral wall of the cylinder hole (28)
An observation hole (10a) reaching the position of the cylinder (10), which can be fitted into the observation hole (10a) of the cylinder (10) and constitutes a part of the wall of the cylinder hole (28); A plug member (12) which can be driven so as to move between a fitting position where the plug member (12) is airtightly fitted in the observation hole (10a) of the cylinder (10) and a removal position which is removed from the observation hole (10a). Drive device (2
6). The reference numerals in parentheses indicate the corresponding members of the embodiment.

[0005]

When the molten material is melted and kneaded, the stopper member driving device is driven in the fitting direction so that the stopper member is forcibly fitted into the observation hole of the cylinder. Thus, the stopper member is airtightly pressed and held at the fitting position, and the molten material can be prevented from leaking to the outside even when the extruder performs the melting / kneading operation. When it is necessary to observe the melting / kneading state of the molten material during the melting / kneading operation of the extruder, the rotation of the screw is stopped and the stopper member driving device is driven in the opposite direction. Thus, the plug member is moved from the fitting position to the removal position. Thereby, the state of the molten material in the cylinder can be immediately observed through the observation hole. After completion of the observation, the stopper member driving device is driven again in the fitting direction so that the stopper member is forcibly fitted into the observation hole of the cylinder, so that the melting / kneading operation of the extruder can be restarted immediately.

[0006]

FIG. 1 shows a first embodiment of the present invention. The bed (fixed part) 30 of the extruder has a cavity 30 at the center of the bed surface (upper surface).
a is formed. A plurality of mounting members 16 are placed on the bed 30. The mounting member 16 in FIG.
Although only two can be seen on the left and right, two or more are provided on one side (four or more in total). The mounting member 16 is
It is fixed to the bed 30 by the fixing member 18. The mounting members 16 are fixed to the biaxial cylinder (cylinder) 10, respectively. That is, the biaxial cylinder 10 is fixed to the bed 30 via the mounting member 16. As a result, the bed 30 is unlikely to be affected by the heat of the biaxial cylinder 10. An observation hole 10a is formed in the upper portion of the biaxial cylinder 10 in the drawing, and penetrates the cylinder wall portion and communicates with a biaxial cylinder hole 28 described later. In the case of the first embodiment, the observation hole 10a has a rectangular cross section as shown in FIG. The biaxial cylinder 10 has a plug member 12 which can be fitted into the observation hole 10a.
Is provided. The connecting member 20 is fixed to the upper part of the plug member 12 in the figure. 2 on bed 30
A support bracket 24 having a U-shaped cross section is fixed with the shaft cylinder 10 interposed therebetween. A hydraulic cylinder (plug member driving device) 26 is attached to the upper portion of the support bracket 24 in the figure. This piston rod (drive part) 26a
Is connected to the connecting member 20 described above. By moving the piston rod 26a of the hydraulic cylinder 26 upward in the drawing (piston rod shortening direction), the plug member 12
Can be moved from the fitting position indicated by the solid line in the figure to the removal position indicated by the virtual line. That is, the plug member 12 can be moved between the fitting position shown in the drawing and the removal position above it by being driven by the hydraulic cylinder 26 via the connecting member 20. Note that FIG. 1 shows a state in which the hydraulic cylinder 26 is acted on by hydraulic pressure in the piston rod extension direction to forcibly push the plug member 12 into the observation hole 10 a of the biaxial cylinder 10. In this state, the plug member 12 constitutes a part of the wall of the biaxial cylinder hole 28. A biaxial screw (not shown) is rotatably fitted in the biaxial cylinder hole 28. The biaxial screw is driven by a motor (not shown) to rotate in the biaxial cylinder hole 28 to perform melting / kneading operation of the molten material.

Next, the operation of the first embodiment will be described.
In the state where the plug member 12 is located at the fitting position shown by the solid line in FIG. 1 (fitting state), the observation hole 10a is closed, and the extruder is in a state where normal melting and kneading operations are possible. , Not shown by a motor not shown 2
By driving the axial screw, the biaxial cylinder hole 2
The molten material in 8 can be melted and kneaded. When it is necessary to observe the molten / kneaded state of the molten material during the melting / kneading operation, the biaxial screw is stopped by stopping the motor. Subsequently, the hydraulic pressure in the direction of shortening the piston rod is applied to the hydraulic cylinder 26 to forcibly pull out the plug member 12 from the fitting position and move it to the removal position indicated by a virtual line. As a result, the biaxial cylinder 10
The observation hole 10a is opened and the molten and kneaded state of the molten material in the biaxial cylinder hole 28 can be immediately observed. After the observation is completed, the hydraulic pressure in the piston rod extension direction is applied to the hydraulic cylinder 26 to forcibly push the plug member 12 from the detached position indicated by the phantom line to the fitting position. Thereby, the observation hole 10a of the biaxial cylinder 10 is
It is hermetically sealed by the plug member 12. Therefore, the melting / kneading operation of the extruder can be started immediately. In this way, it is possible to switch the plug member 12 to either the fitting position or the removal position by simply switching the direction of the hydraulic pressure supplied to the hydraulic cylinder 26. The observation hole 10a of the biaxial cylinder 10 can be opened and closed in a very short time as compared with the operation of loosening or loosening. As a result, it is possible to observe the melting / kneading state of the extruder which is close to the melting / kneading state, and to restart the melting / kneading operation of the extruder in a very short time.

(Second Embodiment) FIG. 4 shows a second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that two hydraulic cylinders 36 are arranged at the left and right sides of the biaxial cylinder 10 and are directly mounted on the bed 30.
Is fixed to the plug member 12 in a state of protruding to the left and right in the figure, and the piston rod 34a of the hydraulic cylinder 36 is connected to each connecting member 34. The other structure is similar to that of the first embodiment.

Next, the operation of the second embodiment will be described.
In order to move the plug member 12 from the fitting position shown by the solid line in the figure to the removal position shown by the phantom line, the hydraulic pressures in the piston shortening direction are supplied to the two hydraulic cylinders 36 in synchronization. As a result, the observation hole 10a can be opened. Also, from this state, the hydraulic pressures in the piston extension direction are supplied to the two hydraulic cylinders 36 in synchronization. As a result, the observation hole 10a can be closed. Other operations are the same as those of the first embodiment.

Although the hydraulic cylinder 26 (or 36) is used as the plug member driving device for driving the plug member 12 in the description of each of the above embodiments, the hydraulic cylinder 26 (or 36) is not limited to the hydraulic cylinder. A linear motor can also be used as the plug member driving device. Further, in the description of each of the above-described embodiments, the observation hole of the biaxial cylinder 10 is formed in the rectangular observation hole 10a, but the present invention is not limited to this. For example, as shown in FIG. A plug member 1 is formed while forming a circular observation hole 10b.
The second fitting portion can also have a circular cross section corresponding thereto. Furthermore, in the above description of each embodiment, the present invention is applied to the biaxial cylinder 10, but the present invention is also applicable to a single shaft cylinder.

[0011]

As described above, according to the present invention, after the extruder is switched from the operating state to the stopped state, an observation hole is opened in a short time to melt / melt the molten material in the cylinder.
The kneading state can be observed.

[Brief description of drawings]

FIG. 1 is a view showing a cylinder of an extruder according to a first embodiment of the present invention.

FIG. 2 is a view showing a state in which a plug member is fitted in an observation hole of a cylinder.

FIG. 3 is a view showing a plug member having another shape and an observation hole of a cylinder having a corresponding shape.

FIG. 4 is a view showing a cylinder of an extruder according to a second embodiment of the present invention.

FIG. 5 is a view showing a cylinder of a conventional semi-cylindrical division type extruder.

FIG. 6 is a diagram showing a state in which a cylinder is opened.

[Explanation of symbols]

 10 2-axis cylinder 10a Observation hole 12 Plug member 20 Connecting member 24 Support bracket 26 Hydraulic cylinder (plug member driving device) 28 Biaxial cylinder hole 30 Bed (fixing part) 34 Connecting member 36 Hydraulic cylinder (plug member driving device)

Claims (1)

(57) [Scope of utility model registration request] 1. A cylinder of an extruder for melting and kneading a molten material and extruding the molten material, wherein the cylinder (10) has an observation hole (10a) penetrating a wall on the outer periphery thereof and reaching a cylinder hole (28). The plug member (12), which is formed and can be fitted into the observation hole (10a) of the cylinder (10) and constitutes a part of the wall of the cylinder hole (28), and the plug member (12). And a stopper member drive device (26) capable of driving the observation hole (10a) so as to move between a fitting position airtightly fitted in the observation hole (10a) and a removal position removed from the observation hole (10a). The extruder cylinder that has.