JP6831262B2 - Hollow molding equipment - Google Patents

Description

The present invention relates to a hollow molding apparatus including a parison cutting apparatus for cutting a parison extruded from a die head and hanging down with an electric heating cutter.

In the hollow forming apparatus, for example, Patent Document 1 and Patent Document 2 describe a parison cutting apparatus in which a tubular parison extruded from a die head attached to an extruder and hung down is cut in a transverse direction by a plate-shaped electric heating cutter. Is known.

Japanese Unexamined Patent Publication No. 2001-212873 Japanese Unexamined Patent Publication No. 2010-10994

The electric heating cutter of the parison cutting device is still a blade even if it is not energized. For example, during maintenance around the die head, the operator should not accidentally touch the electric heating cutter and get injured. It is necessary to cover the electric heating cutter with a cover or the like in advance. As a conventional measure, for example, a leather cover is put on the electric heating cutter, but the attachment of the cover basically depends on the intention of the maintenance worker and forgets the place to put the cover. There is a risk of getting loose or forgetting to attach the cover itself, and there is still room for improvement in ensuring safety during maintenance.

The present invention is intended to solve the above-mentioned problems, and if specific conditions are met without depending on the will of the operator, so to speak, the electric heating cutter of the parison cutting device is automatically used as a safety cover device. It is an object of the present invention to provide a hollow molding apparatus capable of covering.

In order to achieve the above object, the present invention comprises a parison cutting device that cuts a parison extruded from a die head and hung down with an electric heating cutter.
At least the parison cutting device and the safety door surrounding the die head,
A blow molding apparatus equipped with,
The electric heating cutter moves back and forth between the forward position and the backward position, and can move backward to a retracted position further retracted from the backward position.
It is characterized in that the safety cover device covers the electric heating cutter before the locked state of the locking device of the safety door is released from the state of retracting to the retracted position .

Desirably, as described in claim 2, the safety cover is interlocked between the lock device of the safety door and the cover member, and before the locked state of the lock device is released. It is assumed that the device covers the electric heating cutter.

More preferably, as described in claim 3, the electric heating cutter moves back and forth between the forward position and the backward position, and can move backward to a retracted position further retracted from the backward position. It is assumed that the locked state of the locking device is released after the electric heating cutter that has retracted to the retracted position is covered with the safety cover device.

According to the present invention, regardless of the operator's will, the safety cover device covers the electric heating cutter of the parison cutting device before the safety door is opened, so that there is no risk of accidentally touching the electric heating cutter. It can contribute to further improvement of safety.

It is a figure which shows the embodiment of the hollow forming apparatus which concerns on this invention, and is the front view which shows the hollow forming apparatus which omitted the safety door. A side view of the hollow molding apparatus shown in FIG. 1 as viewed from the left side. FIG. 3 is a schematic plan view showing the arrangement relationship between the safety door of the hollow molding apparatus shown in FIG. 1 and the parison cutting apparatus and the safety cover apparatus. The enlarged side view of the parison cutting apparatus in the hollow forming apparatus shown in FIG. The bottom view of the parison cutting apparatus shown in FIG. FIG. 4 is an enlarged cross-sectional view taken along the line AA of the parison cutting device shown in FIG. An enlarged view of the safety cover device shown in FIG. 4 in the B direction. The schematic which shows the drive circuit of the parison cutting device and the safety cover device shown in FIG. FIG. 5 is a flowchart showing a process when the safety door of the drive circuit shown in FIG. 8 is opened. The time chart diagram corresponding to the processing process shown in FIG. FIG. 5 is a flowchart showing a process when the safety door of the drive circuit shown in FIG. 8 is closed. The time chart diagram corresponding to the processing process shown in FIG.

Hereinafter, embodiments of the hollow molding apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 shows a front view of the hollow molding apparatus, and the illustration of the safety door surrounding the front surface and the side surface is omitted. Further, FIG. 2 is a side view of the hollow molding apparatus shown in FIG. 1 as viewed from the left side, and FIG. 3 shows the arrangement relationship between the safety door of the hollow molding apparatus shown in FIG. 1 and the parison cutting device and the safety cover device. It is a schematic plan view which shows.

As shown in FIGS. 1 to 3, the hollow forming apparatus is roughly an extrusion that extrudes a hopper 1 into which a pellet-shaped resin material is charged and a molten resin that is connected to the hopper 1 and is plasticized and melted. A set of two molding dies having a machine 2, a die head 3 connected to the tip of the extruder 2, and a cavity for molding a tubular parison extruded from the die head 3 and hanging down into a hollow molded product. 4. A mold clamping device 7 equipped with an electric machine for closing and opening the front platen 5 and the rear platen 6 on which the molding die 4 is mounted together with the molding die 4, and a parison that cuts the parison to a predetermined length. A cutting device 8, a mold transfer device 9 for moving the molding die 4 together with the front platen 5 and the rear platen 6, a nozzle driving device 11 provided with an air blowing nozzle 10 for blowing air into the parison, and molding. It is composed of a safety door 12 for partitioning an in-flight area in which the mold 4 or the like operates or moves and a work area for performing operation operations and monitoring connected to the in-machine area. The hollow molding apparatus according to the present embodiment is an electric type in which each component is driven by a servomotor.

As shown in FIG. 3, the safety door 12 includes a hinge-type front door 12a that can be opened on the front side of the hollow molding device and a hinge-type side door 12b that can be opened on the side of the hollow molding device. It has. The front door 12a is provided with a handle portion 12c and, for example, an electric lock type locking device 12d having a locking function. When the front door 12a and the side door 12b are closed, the free ends of the doors 12a and 12b are abutted against each other and locked by the locking device 12d. The locking device 12d can be locked and unlocked in the locked state by remote control from the operation panel 31, which will be described later. When the locking device 12d is in the locked state, the front door 12a and the side door 12b cannot be opened even if they are manually operated.

As shown in FIG. 3, the parison cutting device 8 is provided with a long plate-shaped electric heating cutter 8a for cutting the parison extruded from the die head 3 and hung down. FIG. 4 shows an enlarged side view of the parison cutting device in the hollow molding apparatus shown in FIG. 1, and FIG. 5 shows a bottom view of the parison cutting apparatus shown in FIG. Further, FIG. 6 shows an enlarged cross-sectional view of the parison cutting device shown in FIG. 4 along the line AA.

As shown in FIGS. 4 to 6, the ballison cutting device 8 is aligned with each of a flat square-shaped base 8b composed of a pair of vertical frames and a pair of horizontal frames and a pair of horizontal frames of the base 8b. A pair of guide shafts 8c movably inserted into a pair of vertical frames in a state, and a screw shaft of a ball screw 18 rotatably supported between the pair of vertical frames of the base 8b between the pair of guide shafts 8c. (Screw shaft) 8e, a servo motor 8j that rotationally drives the screw shaft 8e, a nut 8f that is screwed into the screw shaft 8e to form a ball screw 18 together with the screw shaft 8e, and an electric heating cutter 8a at the tip. It is provided with 8 g of a substantially U-shaped holder that supports the screw. An encoder 8d is attached to the servomotor 8j. Due to the cooperation between the servo motor 8j and the ball screw 18, the electric heating cutter 8a cuts the electric heating cutter 8a as the cut position P1 as the forward position shown by the imaginary line in FIG. The tubular parison is cut by moving back and forth with the standby position P2 only once. That is, the area between the cut position P1 and the cut standby position P2 shown in FIG. 5 is a regular movable region of the electric heating cutter 8a. Further, the electric heating cutter 8a is connected to a terminal 8k for energizing itself to generate heat.

Further, in the parison cutting device 8, apart from the function of moving the electric heating cutter 8a forward and backward, the entire parison cutting device 8 is configured to be movable back and forth. That is, as shown in FIGS. 4 and 6, two parallel linear motion guides extending in the front-rear direction between the guide receiver 8h provided on the base 8b and the subframe 13a integrated with the frame 13 of the hollow forming apparatus. 14 is interposed, and the frame 13 is fixed to the driving table 11a with bolts. As a result, the base 8b of the parison cutting device 8 is slidably held in the front-rear direction.

Further, a front-rear drive air cylinder 15 is provided on the lower surface of the subframe 13a, and the tip of the piston rod 15a of the air cylinder 15 is connected to a bracket 8i bolted to the base 8b. Therefore, the parison cutting device 8 is driven forward and backward by the operation of the air cylinder 15. As a result, the air cylinder 15 operates the entire parison cutting device 8 until the electric heating cutter 8a is positioned at the maintenance position P3 as the retracted position further behind the cut standby position P2 as the retracted position shown in FIG. It is possible to retreat by. As shown in FIGS. 4 and 5, the air cylinder 15 has a forward limit sensor 15b such as a reed switch that detects that the piston rod 15a has extended to the forward limit position, and the piston rod 15a is in the backward limit position. It is also equipped with a reed limit sensor 15c such as a reed switch that detects that the contracting operation has been performed.

As shown in FIGS. 3 and 4, a safety cover device 20 for covering the electric heating cutter 8a is provided in the vicinity of the parison cutting device 8 before the doors 12a and 12b of the safety door 12 are opened. FIG. 7 shows an enlarged view of the arrow in the B direction of FIG. 4, and as shown in FIGS. 4 and 7, the safety cover device 20 is bolted to the bracket 13b connected to the tip of the frame 13 of the hollow forming device. The vertical drive air cylinder 21 and the box-shaped open / close drive air cylinder 23 provided via an intervening plate 22 connected to the piston rod of the air cylinder 21 are brought close to each other by driving the air cylinder 23. It includes a pair of blade covers 24 and 25 as cover members that can be opened and closed in the horizontal direction. The pair of blade covers 24 and 25 as cover members are formed by , for example, bending a metal plate into a substantially U shape, and are movable portions of an opening / closing drive air cylinder 23 so that their open sides face each other. It is bolted to. A protective cover 21a is attached to the vertical drive air cylinder 21 shown in FIG. 4, but the illustration is omitted in FIG. 7.

Then, as shown in FIGS. 4 and 5, with the electric heating cutter 8a located at the maintenance position P3, the pair of blade covers 24 and 25 descend to the positions indicated by the imaginary line P4 based on the operation of the air cylinder 21. Further, the pair of blade covers 24 and 25 are closed in the direction of approaching each other based on the operation of the air cylinder 23, so that the electric heating cutter 8a at the maintenance position P3 can be covered with the pair of blade covers 24 and 25. You can do it. Similar to the air cylinder 15, the air cylinders 21 and 23 are provided with sensors for detecting the forward limit position and the backward limit position. That is, an ascending limit sensor and a descending limit sensor are attached to the air cylinder 21, and an opening limit sensor and a closing limit sensor are attached to the air cylinder 23, but they are not shown here.

The parison cutting device 8 and the safety cover device 20 are driven and controlled by the drive circuit shown in FIG.

The drive circuit shown in FIG. 8 includes an operation panel 31, a sequence device (also referred to as a sequence controller, a sequencer, a programmable logic controller (PLC), etc.) 32 electrically connected to the operation panel 31, and an opening / closing drive. An electromagnetic valve 33 for the air cylinder 23, an electromagnetic valve 34 for the vertical drive air cylinder 21, an electromagnetic valve 35 for the front / rear drive air cylinder 15, and a servo amplifier 36 for driving the servo motor 8j. And have. Each of these solenoid valves 33, 34, 35 and the servo amplifier 36 are electrically connected to the sequence device 32. Further, the locking device 12d attached to the safety door 12 is electrically connected to the sequence device 32, and signals from each sensor attached to each air cylinder 15, 21, 23 are not shown. It is designed to be taken in.

The sequence device 32 generally controls the CPU unit (central processing unit), the input / output mixing unit that mainly controls the drive mechanism shown in FIG. 8, and various servo motors such as the servo motor 8j. It is equipped with a motion controller, etc. As described above, the servomotor 8j is attached with the encoder 8d, and forms a position feedback loop for the parison cutting device 8 with the sequencing device 32. Then, the sequence device 32 determines the state of each mechanical element based on the signals from the sensors attached to the air cylinders 15, 21 and 23 described above in addition to the encoder 8d, and particularly the safety doors. At the time of opening / closing operation of 12, a predetermined process is executed according to the procedure of the flowchart shown in FIG. 9 or 11.

The operation panel 31 shown in FIG. 8 is provided with an open / close button for the safety door 12 in order to obtain an interlock between the opening / closing operation of the safety door 12 and the operation of the safety cover device 20. Then, prior to opening the safety door 12 shown in FIG. 3 during maintenance of the hollow molding apparatus, for example, the opening button of the safety door 12 is pushed down on the operation panel 31 as in step S1 of FIG. Then, the sequence device 32 determines whether or not the electric heating cutter 8a is in the cut standby position P2, which is the retracted position shown in FIG. 5, as in step S2 of FIG. If the electric heating cutter 8a is not in the cut standby position P2, the servomotor 8j drives the screw shaft 8e of the ball screw 18 to move the electric heating cutter 8a to the cut standby position P2 as shown in step S3 of FIG. It has become.

Next, when the electric heating cutter 8a is located at the cut standby position P2, the front / rear drive air cylinder 15 is contracted via the solenoid valve 35 of FIG. 8 as in step S4 of FIG. 9, and the electric heating cutter 8a is moved to FIG. The entire parison cutting device 8 is retracted until it is located at the maintenance position P3 as the retracted position shown by the imaginary line. The air cylinder 15 can be abolished if the movable portion of the parison cutting device 8 can be retracted by the stroke of the ball screw 18 until the electric heating cutter 8a is located at the maintenance position P3.

When the entire parison cutting device 8 retreats until the electric heating cutter 8a is located at the maintenance position P3, the retreat limit sensor 15c shown in FIG. 8 operates ON as in step S5 of FIG. 9, and the signal is the sequence device. It is taken in by 32. On condition that the retract limit sensor 15c is turned on, the vertical drive cylinder 21 is operated via the solenoid valve 34 of FIG. 8 as shown in step S6 of FIG. 9, and the pair of blade covers 24 of the safety cover device 20 It is designed to lower 25.

When the pair of blade covers 24 and 25 are lowered and the lowering limit sensor (not shown) is turned on as in step S7 of FIG. 9, the solenoid valve 33 of FIG. 8 is operated on condition that the lowering limit sensor is turned on. The air cylinder 23 for opening / closing drive is operated via the air cylinder 23, and as shown by the imaginary line P4 in FIG. 4, the pair of blade covers 24, 25 approach each other so as to cover the electric heating cutter 8a with the pair of blade covers 24, 25. It is designed to operate and close. Step S8 in FIG. 9 corresponds to this process.

When the pair of blade covers 24 and 25 are closed as in step S9 of FIG. 9, the closing sensor (not shown) is turned on, and on condition that the closing sensor is turned on, step S10 of FIG. 9 is performed. As shown in FIG. 3, the locking state of the locking device 12d attached to the front door 12a and the side door 12b of the safety door 12 shown in FIG. 3 is released (unlocking operation). As a result, the front door 12a and the side door 12b shown in FIG. 3 can be manually opened for the first time as shown by the imaginary line in the figure. FIG. 10 shows the start / end timing of a series of processes when the safety door is opened.

On the other hand, when the safety door 12 is closed, the sequencer 32 executes the process as shown in FIG. That is, when the front door 12a and the side door 12b of the safety door 12 shown in FIG. 3 are closed and the close button of the safety door 12 is pressed down on the operation panel 31 as in step S11 of FIG. As in step S12 of 11, the sequence device 32 locks the locking device 12d of the safety door 12.

Next, as in step S13 of FIG. 11, the sequencer 32 determines whether or not all the servo control systems of each component in the hollow forming apparatus are ready, and if NO, as in step S14 of FIG. In addition, the sequencer 32 waits until all the servo control systems are ready. When all the servo control systems are ready, as shown in step S15 of FIG. 11, the air cylinder 23 for opening / closing drive is operated via the solenoid valve 33 of FIG. 8, and a pair of safety cover devices 20 are operated. By separating the blade covers 24 and 25 from each other, the blade covers 24 and 25 can be opened from each other.

When the opening of the pair of blade covers 24, 25 of the safety cover device 20 is detected by the ON operation of the limit sensor (not shown) as in step S16 of FIG. 11, the sequence device 32 detects the opening of the safety cover device 20 by step S17 of FIG. As shown above, the vertical drive cylinder 21 is operated via the solenoid valve 34 of FIG. 8 to raise the pair of blade covers 24 and 25 of the safety cover device 20.

When it is detected by the ON operation of the ascending limit sensor (not shown) that the pair of blade covers 24 and 25 of the safety cover device 20 have been raised as in step S18 of FIG. 11, the sequence device 32 has the step of FIG. As in S19, the front-rear drive air cylinder 15 is operated via the solenoid valve 33 of FIG. 8, and the entire parison cutting device 8 is operated until the electric heating cutter 8a is located at the cut standby position P2 which is the retracted position of FIG. It is designed to move forward.

Next, when it is detected that the electric heating cutter 8a is located at the cut standby position P2 by the ON operation of the forward limit sensor (not shown) as in step S20 of FIG. 11, this ON signal is taken into the sequence device 32. The hollow forming apparatus is ready to start forming. FIG. 12 shows the start / end timing of a series of processes when the safety door is closed.

Next, the operation of the hollow forming apparatus including the maintenance process as shown in FIGS. 9 and 11 will be described.

The resin pellets charged from the hopper 1 shown in FIG. 2 are melted while passing through the extruder 2 and the die head 3, and the molten resin is extruded from the die head 3 as a tubular parison and hangs down. The hanging tubular parison is housed in an open molding die 4, and is cut by moving the electric heating cutter 8a of the parison cutting device 8 back and forth in a horizontal manner. That is, the tubular parison is cut by the electric heating cutter 8a of the parison cutting device 8 shown in FIG. 5 moving forward from the cut standby position P2 which is the retracted position to the cut position P1 which is the forward position. After that, the electric heating cutter 8a of the parison cutting device 8 retracts from the cut position P1 which is the forward position to the cut standby position P2 which is the retract position. Under this state, the cut tubular parison is transferred by the mold transfer device 9 directly under the nozzle driving device 11 while being molded by the mold clamping device 7.

The nozzle driving device 11 lowers the air blowing nozzle 10 and drives it into the molding die 4, blows compressed air into the tubular parison in the molding die 4, and presses the expanded parison into the cavity of the molding die 4. To mold the molded product. Then, while the molding die 4 moves directly under the die head 3 which is the original position in the open state, the air blowing nozzle 10 suspends the molded product, and the molded product holder (not shown) molds from the air blowing nozzle 10. Take out the product and carry out the molded product to the outside.

When performing maintenance or other work after performing a predetermined cycle with such a molding cycle as one cycle, first, the operation of pressing down the button for opening the safety door 12 on the operation panel 31 is started. According to the flowchart shown in FIG. 9, when the button is pressed, whether or not the electric heating cutter 8a of the parison cutting device 8 shown in FIG. 5 is in the cut standby position P2 which is the retracted position is attached to the servomotor 8j. Confirmed by the position signal of the encoder 8d, if it is not in the cut standby position P2, the electric heating cutter 8a is moved to the cut standby position P2.

As soon as it is confirmed that the electric heating cutter 8a is in the cut standby position P2 which is the retracted position, the entire parison cutting device 8 is operated by the front-rear drive air cylinder 15 so as not to interfere with the maintenance work and due to the structure of the molding device. Retreat to a position as far away from the operator as possible. That is, the entire parison cutting device 8 is retracted until the electric heating cutter 8a of the parison cutting device 8 shown in FIG. 5 is located at the maintenance position P3 which is the retracted position. When the electric heating cutter 8a of the parison cutting device 8 is retracted to the maintenance position P3, the safety cover device 20 is located directly above the electric heating cutter 8a.

Next, in order to lower the pair of blade covers 24 and 25 to a height at which the pair of blade covers 24 and 25 of the safety cover device 20 can cover the electric heating cutter 8a, the vertical drive air cylinder 21 is operated. In order to lower the pair of blade covers 24 and 25 in an open state so as not to interfere with the electric heating cutter 8a waiting at the maintenance position P3, whether or not the electric heating cutter 8a is located at the maintenance position P3 is moved back and forth. This is confirmed by the retreat limit sensor 15c (see FIGS. 4 and 5) attached to the drive air cylinder 15. As soon as it is confirmed that the electric heating cutter 8a is in the maintenance position P3, the pair of blade covers 24 and 25 of the safety cover device 20 are lowered.

Finally, the pair of blade covers 24, 25 of the safety cover device 20 that has been lowered are closed by the open / close drive air cylinder 23 to a position that covers the electric heating cutter 8a. Whether or not the pair of blade covers 24 and 25 of the safety cover device 20 are in the descending position is confirmed by a descending limit sensor attached to the vertical drive air cylinder 21 (not shown). As soon as it is confirmed that the blade cover is in the lower limit position, the pair of blade covers 24 and 25 are closed.

It is confirmed that the series of operations has been completed based on the signal of the closing sensor (not shown) attached to the air cylinder 23 for opening / closing drive, and as soon as it is confirmed, the locking device 12d attached to the safety door 12 Outputs a signal to release the lock state of. As a result, the locked state of the locking device 12d is released and the locked state is unlocked. In this state, the front door 12a and the side door 12b of the safety door 12 shown in FIG. 3 can be opened manually for the first time, and the operator can manually open the hollow molding device inside the front door 12a and the side door 12b shown in FIG. You will be able to perform the necessary maintenance work.

On the other hand, if the work such as the maintenance of the above is completed, the operator on closing the front door 12a and the side face door 12b of the safety door 12 shown in FIG. 3, first, a safety door 12 in control panel 31 It starts with the action of pressing the close button. When the button is pressed according to the flowchart shown in FIG. 11, the locking device 12d of the safety door 12 is locked, the locked state of the locking device 12d and each servomotor of the hollow forming device are confirmed to be normal, and the sequencing device is confirmed. In 32, it is determined that all the servo control systems are ready.

In response to this, the pair of blade covers 24, 25 of the safety cover device 20 are opened by the operation of the open / close drive air cylinder 23 to a position where they do not interfere with the electric heating cutter 8a.

Next, in order to raise the pair of blade covers 24 and 25 of the safety cover device 20 to the height of the standby position (original position), the vertical drive air cylinder 21 is operated. At this time, whether or not the pair of blade covers 24 and 25 are in an open state is confirmed by an open limit sensor attached to the open / close drive air cylinder 23 (not shown). As soon as it is confirmed that the pair of blade covers 24 and 25 are in the opening position, the pair of blade covers 24 and 25 of the safety cover device 20 are raised.

Further, in order to move the electric heating cutter 8a to the cut standby position P2 which is the retracting position, the entire parison cutting device 8 is advanced by the operation of the front-rear driving air cylinder 15. At this time, whether or not the safety cover device 20 is in the raised state is confirmed by the rising limit sensor attached to the vertical drive cylinder 21 (not shown). As soon as it is confirmed that the pair of blade covers 24 and 25 of the safety cover device 20 are in the ascending limit position, the front-rear drive air cylinder 15 is advanced.

Further, whether or not the electric heating cutter 8a is in the cut standby position P2, which is the retracting position, is confirmed by the retracting limit sensor 15c attached to the front-rear drive air cylinder 15, and it is confirmed that these series of operations have been completed. When 32 confirms, the parison cutting device 8 is ready for normal cutting operation.

As described above, according to the present embodiment, when the front door 12a and the side door 12b of the safety door 12 are opened and the safety door 12 is approached to perform a predetermined maintenance work, the safety door 12 is attached. An interlock is taken between the locking device 12d and the safety cover device 20. Then, before the locked state of the locking device 12d is released, the electric heating cutter 8a of the parison cutting device 8 is covered based on the closing operation of the pair of blade covers 24, 25 of the safety cover device 20. Therefore, there is no possibility that the operator carelessly touches the electric heating cutter 8a, which can contribute to further improvement of safety.

Further, the electric heating cutter 8a of the parison cutting device 8 can move forward and backward between the cut position P1 which is the forward position and the cut standby position P2 which is the backward position, and further retracts from the cut standby position P2. The electric heating cutter 8a, which has been retracted to the maintenance position P3 as the retracted position, can be retracted together with the parison cutting device 8, and after being covered with the pair of blade covers 24, 25 of the safety cover device 20, The locked state of the locking device 12d of the safety door 12 is released. Therefore, it is possible to perform the maintenance work after retracting the electric heating cutter 8a of the parison cutting device 8 larger than the normal operating area, and it is possible to secure a large work space for the maintenance work. There is an advantage that it can also contribute to the improvement of workability.

3 ... Die head 8 ... Parison cutting device 8a ... Electric heating cutter 12 ... Safety door 12a ... Front door 12b ... Side door 12d ... Locking device 20 ... Safety cover device 24, 25 ... Blade cover (cover member)
P1 ... Cut position (advance position)
P2 ... Cut standby position (backward position)
P3 ... Maintenance position (evacuation position)

Claims (2)

A parison cutting device that cuts the parison extruded from the die head and hangs down with an electric heating cutter.
At least the parison cutting device and the safety door surrounding the die head,
A blow molding apparatus equipped with,
The electric heating cutter moves back and forth between the forward position and the backward position, and can move backward to a retracted position further retracted from the backward position.
A hollow molding device, characterized in that the safety cover device covers the electric heating cutter before the locked state of the safety door locking device is released from the state in which the safety door is retracted to the retracted position . The hollow molding apparatus according to claim 1 , wherein the locked state of the locking device is released after the electric heating cutter retracted to the retracted position is covered with the safety cover device.

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