JP4435905B2 - Extruder screen changer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an extrusion molding machine for continuously molding, for example, synthetic resin conduits and hoses, and more particularly to a screen exchange device capable of replacing a screen without interrupting the operation of the extrusion molding machine.
[0002]
[Prior art]
In a conventional extrusion molding machine, the screen is generally pressed against the front end surface of the heating cylinder, and the periphery of the screen is sandwiched between a pair of upper and lower C-shaped clamping frames supported by the heating cylinder. When the screen becomes clogged, the operation of the extruder is stopped, the holding frame is opened, the clogged screen is removed, and a new screen is installed. In the extrusion molding machine as described above, the operation of the extrusion molding machine has to be interrupted in order to replace the screen, so that the operation rate of the extrusion molding machine is greatly reduced and remains in the heating cylinder during the shutdown. There is a disadvantage that the resin material is wasted, for example, the resin material is changed in quality.
[0003]
[Problems to be solved by the invention]
In view of the above-described problems, an object of the present invention is to realize a screen changer for an extrusion molding machine that can push out a clogged screen to the side and simultaneously attach a new screen.
[0004]
It is in.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention has a cylindrical head coupled to the front end portion of the heating cylinder, and a screen support frame for supporting the first and second screens is movably supported on the head. A pair of upper and lower clamps are supported on a head by a support shaft, a die having a nozzle is applied to the front surface of the screen support frame, and the upper and lower edges of the die are connected to the head through a pair of upper and lower clamps by a first actuator. And the screen support frame is configured such that when the first screen is removed from the inside of the head by the second actuator, the second screen is attached to the inside of the head. Is coupled to a fixed plate at the end of a pair of upper and lower guide rods integrated with the support shaft, and the rod protruding from the second actuator is moved to the left and right along the guide rod. Coupled to the movable plate, characterized in that said screen support frame coupled to the movable plate.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, a screen support frame is supported on the front end or head of the heating cylinder so as to be movable in a direction perpendicular to the heating cylinder, a die is pressed against the front surface of the screen support frame, and a pair of upper and lower or left and right is moved by the first actuator. Fasten through the clamp. The screen support frame is supported via a sliding plate with respect to the head. When the screen support frame is moved by the second actuator, a new screen is mounted on the head following the clogged screen. If the screen extruded to the outside is cleaned, the extruder can be operated continuously without interrupting the operation, and the resin material can be interrupted for a moment during the replacement of the screen. The molded product extruded from the die is continuous. When changing the color of the resin material, etc., the clamp is opened, the die is removed, and the resin material remaining inside the die is removed. In addition, operation can be resumed as soon as a new die is installed.
[0007]
【Example】
FIG. 1 is a side sectional view of a screen exchange device for an extrusion molding machine according to the present invention, and FIG. 2 is a front sectional view showing a main part of the screen exchange device for the extrusion molding machine taken along line 2A-2A in FIG. Although the extrusion molding machine contains the screw 3 inside the heating cylinder 2, although not shown, the right end of the heating cylinder 2 is provided with a resin material supply device and a drive mechanism for driving the screw 3 to rotate. An electric heater is disposed on the peripheral wall of the cylinder 2. A cylindrical head 5 is fitted on the front end of the heating cylinder 2 where the outer diameter is reduced, and is coupled to the heating cylinder 2 by a large number of bolts 4. A screen support frame 26 that supports the first and second screens 6 is slidably supported in a direction perpendicular to the cylindrical portion 2a by a pair of upper and lower sliding plates 22 having a cross-sectional groove shape inside the head 5. Is done. The die 7 having the nozzle holes 7 a is brought into contact with the front surface of the screen support frame 26, and the upper and lower edges 7 b of the die 7 are pressed against the front end surface of the head 5 by a pair of clamps 19.
[0008]
As shown in FIGS. 1 and 2, the outer shape of the head 5 is substantially rectangular, and a large number of holes 4 a for inserting the bolts 4 are formed at equal intervals in the circumferential direction at the end where the screen support frame 26 is engaged. Provided. One end of each clamp 19 is rotatably supported on the head 5 by a lateral support shaft 5 a, and the other end of the clamp 19 is connected to the piston rod 17 of the first actuator 20 by a pin 18. In the actuator 20, a piston is fitted into the cylinder 16 and oil chambers are defined at both ends, and a rod 17 coupled to the piston projects outward. The support member 16a coupled to the cylinder 16 is supported by a pair of brackets 14 protruding from a support plate 13 coupled to the head 5 by a pair of left and right pins 15. The support plate 13 is joined to the rear end surface of the head 5 by welding together with a pair of left and right stays 12.
[0009]
Although not shown, the hydraulic circuit of the first actuator 20 is provided with a relief valve, and when the clamp 19 is overloaded, the relief valve is opened and the clamp 19 operates in the releasing direction, and the screen 19 Configured to prevent damage.
[0010]
As shown in FIGS. 3 and 4, the screen support frame 26 is connected by a pin 34 to a movable plate 37 that slides along a pair of upper and lower guide rods 35. That is, the connecting piece 26 a formed at the left end portion of the screen support frame 26 is connected by the connecting piece 33 and the pin 34, and the connecting piece 33 is connected to the movable plate 37. Preferably, the guide rod 35 is formed integrally with the support shaft 5a and supported by the head 5. The cylinder 31 of the actuator 30 is coupled to the fixed plate 36 coupled to the left end portion of the guide rod 35. The actuator 30 has a piston fitted into a cylinder 31 and oil chambers are defined at both ends. A rod 32 coupled to the piston protrudes outside and is connected to a movable plate 37 through a hole in a fixed plate 36. The screen support frame 26 is provided with two stepped holes 26b, and the screen 6 is detachably fitted into each stepped hole 26b. The die 7 is supported by a pin 43 so that it can be opened and closed by a pair of upper and lower support plates 42 protruding rightward from a pair of upper and lower support plates 41 protruding rightward from the head 5.
[0011]
Next, the operation of the extruder according to the present invention will be described. In FIG. 1, the resin pellet supplied to the right end (not shown) is heated and melted in the heating cylinder 2 and sent to the left side, that is, the front end by the screen 3, and foreign matter is filtered by the screen 6. By continuously extruding from the nozzle 7a to the outside, a molded product such as a hose is manufactured. When the screen 6 is clogged, as shown in FIGS. 3 and 4, the screen support frame 26 is pushed in the direction of the arrow by the actuator 30, and the clogged screen 6 a is smoothly pushed out from the head 5. At the same time, a new screen 6 is pushed into the head 5. At this time, the die 7 is fastened by the first actuator 20 via the clamp 19, and the screen support frame 26 moves along a pair of upper and lower sliding plates 22 (FIG. 1). Since the replacement of the screen 6 is instantaneous (about 1 second), the resin material pushed out from the nozzle 7a by the screw 3 stops for a moment, but as soon as a new screen 6 is connected to the cylindrical portion 2a inside the head 5, Since the resin material of the cylindrical portion 2a is sent to the nozzle 7a of the die 7 and is integrated with the resin material accumulated in the nozzle 7a and pushed out from the nozzle 7a, the molded product is sent out as a continuous product.
[0012]
When changing the color of the resin material, the operation of the extrusion molding machine is interrupted, and the clamp 19 is released by rotating the pair of upper and lower clamps 19 around the support shaft 5a by the actuator 20, and the die 7 is moved to the right side. It can be rotated about a pair of upper and lower pins 43 and can be opened to the right. The resin material remaining in the cylindrical portion 2a is discharged to the outside, and after cleaning, the screen support frame 26 is moved in the horizontal direction and replaced with a new screen 6. At this time, since the installation space of the screen 6 is very narrow, the amount of the resin material remaining in the installation space is small, and the waste of the resin material is very small. If the die 7 is pressed against the front surface of the screen support frame 26 and fastened by a pair of upper and lower clamps 19, the extrusion molding machine can be restarted immediately.
[0013]
In the above-described embodiment, the screen support frame 26 supporting the first and second screens is supported by the head 5 so as to be movable left and right, and the die 7 is fastened to the head 5 by a pair of upper and lower clamps 19. The screen support frame may be supported by the head so as to be movable up and down, and the die may be fastened to the head by a pair of left and right clamps.
[0014]
【The invention's effect】
In the present invention, as described above , the cylindrical head is coupled to the front end portion of the heating cylinder, and the upper and lower edges of the die are fastened to the head. Therefore, the screen support frame is moved forward and backward by two parts, the head and the die. Since it is supported from above and below, it can be supported reliably, and as a result, it can be supported smoothly.
In the present invention, a cylindrical head is coupled to the front end of the heating cylinder, and a screen support frame for supporting the first and second screens is movably supported on the head, and a pair of upper and lower parts is supported on the head. A clamp is supported by a support shaft, a die having a nozzle is applied to the front surface of the screen support frame, and the upper and lower edges of the die are fastened to the head via a pair of upper and lower clamps by a first actuator. The support frame is configured such that when the first screen is removed from the inside of the head by the second actuator, the second screen is attached to the inside of the head, so that the screen is clogged. At the same time, the clogged screen is removed to the outside, and at the same time, a new screen is attached to the front end of the heating cylinder, and the molded product is continuously obtained without interruption. Concrete expenses are reduced, operation rate of the extruder is improved.
[0015]
While the die is held by the pair of upper and lower clamps, the screen can be changed by moving the screen laterally by the second actuator, so that the resin material is continuously pushed out of the die before and after the change of the screen.
[0016]
Since the screen is locked by the second actuator, operations such as color change can be performed quickly.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a screen exchange device of an extrusion molding machine according to the present invention.
FIG. 2 is a front sectional view of a screen exchange device of the same extrusion molding machine.
FIG. 3 is a front view showing a main part of a screen exchange device of the same extrusion molding machine.
FIG. 4 is a front view of a screen exchange device of the same extrusion molding machine.
[Explanation of symbols]
2: Heating cylinder 2a: Cylindrical part 3: Screw 4: Bolt 4a: Screw hole 5: Head 5a: Support shaft 6: Screen 6a: Screen 7: Die 7a: Nozzle 7b: Edge 12: Stay 13: Support plate 14: Bracket 15: Pin 16: Cylinder 16a: Support member 17: Piston rod 18: Pin 19: Clamp 20: First actuator 22: Sliding member 26: Screen frame 26a: Connecting piece 26b: Stepped hole 30: Second actuator 31 : Cylinder 32: Piston rod 33: Connecting piece 34: Pin 35: Guide rod 36: Fixed plate 37: Movable plate

Claims (1)

A cylindrical head is connected to the front end of the heating cylinder, and a screen support frame for supporting the first and second screens is supported on the head so as to be movable left and right. A pair of upper and lower clamps are horizontally supported on the head. The die is supported by a shaft, a die having a nozzle is applied to the front surface of the screen support frame, the upper and lower edges of the die are fastened to the head via a pair of upper and lower clamps by a first actuator, and the screen support frame is When the second screen is removed from the inside of the head by the second actuator, the second screen is mounted inside the head, and the second actuator is integrated with the upper and lower 1 Supporting the end of the pair of guide rods, connecting the rod of the second actuator to a movable plate moving along the guide rod, and connecting the screen support frame to the movable plate Screen changer of the extruder, characterized in that the sintering.

Images