JP2696144B2 - Folding step device for injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an injection molding machine, especially a large injection molding machine, which is used when an operator needs to approach a mold for maintenance or removal of a molded product. About.

(Prior Art) In a large-sized injection molding machine, the distance from the operation side to the non-operation side of the safety door sometimes reaches 4 to 5 meters.

For this reason, a scaffold is required to approach the mold. Therefore, a table lifter is provided at one place inside the stay, and at one place each on the operation side and the non-operation side outside the stay, a total of three places.
The table lifter is retracted to a low position to avoid interference with the movable platen, and can be moved up and down as needed when the movable platen stops opening. The table lifter is movable on the rail in the opening and closing direction of the movable plate so as to be able to respond to differences in mold thickness and mold opening position.

(Problems to be Solved by the Invention) However, providing the table lifter over three considerable spaces and movably requires a considerable expense.

When the large machine has a large movable plate but the space under the movable plate is narrow, the table lifter cannot be stored in many cases or the lifting stroke of the table lifter cannot be sufficiently taken. There is.

Further, the stay portion has no scaffolding because the table lifter cannot be moved up and down, and a mat switch or the like cannot be provided in that portion, which is disadvantageous in that it is not safe and is dangerous.

(Means for Solving the Problems) In order to solve the problems, according to the present invention, an operation-side movable base is provided outside the lower two stays of an injection molding machine so as to be movable along the opening and closing direction of a movable platen. And a non-operation side movable base,
A pivoting step is mounted on each of the movable tables so as to be pivotable between a vertical retracted position and a horizontal in-mold working position, and a lower surface of the pivoting step is provided with the stay when the pivoting step is in the in-mold working position. Providing a cushion member in contact with the upper surface, and providing a movable step capable of moving forward and backward guided by the turning step between a retracted position almost overlapping the turning step and an advanced position reaching substantially the center of the injection molding machine, A locking device for immovably locking the turning step when the turning step is in the retracted position;
A detection device for electrically detecting the lock position is provided, and various safety interlocks can be attached.

(Operation) The turning step retracts in a state perpendicular to each of the operating side and the non-operating side moving platform, and retracts to a position almost overlapping with the turning step so as not to interfere with the upper stay during turning. After the movable step has pivoted to a horizontal position where the cushion member provided on the lower surface of the pivot step is placed on the stay, the movable step moves forward until the retracted movable step reaches near the center of the injection molding machine. Accordingly, it is possible to secure a scaffold for mold inspection and the like with sufficient strength without chipping from the operation side to the non-operation side.

(Example) Hereinafter, in order to clarify the present invention more specifically, an example will be described with reference to the drawings.

1 is a base of the injection molding machine, and 2 is a fixed platen on which the base 1 is fixed.

Reference numeral 3 denotes a movable plate, which can approach and separate from the fixed plate 2 along four stays 4.

Reference numeral 5 denotes a fixed-side mold attached to the fixed platen 2, and reference numeral 5 denotes a movable-side mold attached to the movable platen 3.

7 is an outer frame of the injection molding machine.

Regarding the following foldable step device, the operating side and the non-operating side have the opposite function except for the projector and the receiver, but have the same functions and configurations. Therefore, the operation is performed on the operation side (the front side in FIG. 1) unless otherwise specified.

Reference numeral 8 denotes a movable table which is inserted into the two guide bars 9, 9 and is slidable along the opening and closing direction of the movable platen 3. The guide bars 9, 9 are provided over a distance corresponding to the surface between the fixed mold 5 and the movable mold 6 when the mold is opened, and both ends are fixed by a pair of support legs 10, 10. When the support legs 10, 10 are fixed to the outer frame 7 of the injection molding machine, the guide bars 9, 9 are substantially fixed to the injection molding machine, and the movable bar 8 slides on the guide bars 9, 9. It is free to move.

Reference numeral 8A denotes handrails provided at both ends of the movable base 8.

Reference numeral 11 denotes a turning step having side walls 11A on both sides.

Reference numerals 12 and 13 denote a pair of L-shaped brackets, respectively. The brackets 12 and 13 are provided with protruding pin portions 12A and 13A for pivotally supporting the turning step 11.

The turning step 11 is a bracket 12,
13 and is pivotally supported by the pin portions 12A and 13A.

The brackets 12, 13 are fixed to the movable base 8 by bolts or the like.

Reference numeral 14 denotes a lock cylinder mounted on the bracket 13, and a lock pin 14 A at the distal end thereof can advance and retreat toward the turning step 11 through a mounting wall of the bracket 13.

A through hole is provided in the side wall surface 11A of the turning step 11 at a position where the lock pin 14A of the lock cylinder 14 can be inserted only when the turning step 11 is at the vertical position (hereinafter referred to as a retracted position). Further, when the lock pin 14A is inserted into the through hole and is at the forward limit, the state is detected by an electric detection device (not shown).

Until the turning step 11 turns from the retracted position to the horizontal position (hereinafter referred to as the in-mold working position), that is, in a position other than the retracted position, the lock pin 14A advances toward the side wall surface of the turning step 11. The electrical detection device does not work because it is blocked by 11A and the extended side wall surface 11B.

A cushion member 15 is attached to the lower surface of the turning step 11 so as to come into contact with the upper surface of the stay 4 when the turning step 11 is at the working position in the mold.

Rail portions 11C, 11C are provided on both side walls 11A, 11A of the turning step 11.
Are formed.

Reinforcing members are suitably provided on the portion where the cushion member 15 is attached to the turning step 11 and other necessary parts, but are not shown.

Reference numeral 16 denotes a turning cylinder, between a mounting bracket 17 fixed to the moving base 8 and a mounting bracket 18 fixed to the turning step 11, the piston rod 16A side is mounted on the mounting bracket 18 by a pin 20 and the opposite side. Each is mounted on a mounting bracket 17 by being pivotally supported by a pin 19. The turning step 11 is set to the retracted position when the piston rod 16A of the turning cylinder 16 is at the forward limit, and to the in-mold working position when the piston rod 16A is at the reverse limit.

Reference numeral 21 denotes a movable step having side wall surfaces 21A, 21A on both sides.

The side wall surfaces 21A, 21A of the movable step 21 are shown in FIG.
As shown in the figure, four wheel devices 22 are provided so that the wheels with both collars can rotate. The turning step
The movable step is performed by fitting four wheel devices 22 into the rail portions 11C, 11C formed on both side wall surfaces 11A, 11A of 11.
21 can be moved forward and backward while being guided by the turning step 11.

Reference numeral 23 denotes a forward / backward moving cylinder, the rear end of which is fixed to a mounting bracket 24 fixed to the turning step 11, and the front end of a piston rod 23A of the forward / backward moving cylinder 23 is fixed to a mounting bracket 25 which is fixed to the movable step 21. ing.

Then, the movable step 21 almost overlaps with the turning step 11 when the piston rod 23A of the movable cylinder 23 is at the retreat limit, and when the piston rod 23A is at the forward limit, its tip reaches almost the center of the injection molding machine. I have.

Hereinafter, an electrical interlock device provided in this embodiment for security confirmation and the like will be described.

Reference numeral 26 denotes a light emitter installed on the handrails 8A at both ends of the movable base 8 from the operation side to the non-operation side, and 27 denotes a light receiver. Of course, the projector 26 may be installed from the non-operation side to the operation side. The light emitter 26 and the light receiver 27 are for confirming that there are no obstacles when the turning step 11 with the movable step 21 turns from the retracted position to the in-mold working position, and is preferably a continuous strip.

A mat switch (not shown) is laid on the upper surfaces of all the turning steps 11 and the movable steps 21 over the entire area. The mat switch is one in which a switch such as a limit switch or a voltage element is incorporated under a tread plate. The mat switch is provided as an interlock for detecting the weight when an operator or the like is put on, turning off the power of the pump, and preventing the movable platen 3 from moving absolutely.

Further, in this embodiment, all the lock cylinders 14, the turning cylinders 16 and the forward / backward moving cylinders 23 have a forward limit and a reverse limit position detection sensors.

 Next, the operation will be described.

The injection molding machine is in the mold open state. The turning step 11 is in the retracted position, and the movable step 21 is
It is in a state almost overlapping 11.

First, the movable table is moved to a position where mold inspection or the like is easy to perform, and positioning is performed. Since the frequency of the positioning is not so high, in this embodiment, the positioning is manually performed by an operator. Of course, it may be performed automatically using a cylinder or the like.

Next, when a lowering (turning) command of the turning step 11 is given, it is confirmed that the light emitters 26, 26 and the light receivers 27, 27 have no obstacles, and the lock pin 14A of the lock cylinder 14 is retracted, and the turning step 1
1 is mechanically unlocked and can be turned.

At this time, that is, when the electrical advance limit check of the lock cylinder 14 is canceled, the movable platen 3 cannot be electrically closed.

When the position detection sensor of the lock cylinder 14 confirms the retreat limit, the revolving step 11 is lowered by retreating the piston rod 16A of the revolving cylinder 16.

The cushion member 15 provided on the lower surface of the turning step 11 abuts on the upper surface of the stay 4, and the turning step 11 becomes the working position in the mold.

When the retreat limit of the turning cylinder 16 is confirmed, the movable step 21 turns each wheel device 22 by turning the piston rod 23A of the forward / backward moving cylinder 23 forward.
The vehicle advances while being guided by the 11 rails 11C.

When the movable step 21 reaches the forward limit as described above, it becomes the working position in the mold shown in FIG. 1 and the scaffold is completed between the operating side and the non-operating side, so that the fixed-side mold 5 can be easily inspected. .

In addition, if the positioning of the movable table 8 is performed at a position indicated by a virtual line, the movable mold 6 can be easily inspected.

At this time, it is also possible to leave the retreat position without operating the turning step on either the non-operation side or the operation side,
It can be easily selected by a selector switch.

When the operator gets on the turning step 11 or the movable step 21, the mat switch laid on the surface confirms its weight and stops the pump of the injection molding machine. Turning step 1
The contacts of the mat switch laid on each of the movable steps 1 and 11 and the movable steps 21 and 21 or their equivalents are all connected in series, so that the pump can be turned off even if any mat switch detects the weight. I have. The movable platen 3 loses its drive source and becomes immovable, so that the safety of work in the mold is completely ensured.

When the in-mold operation is completed, an ascent (turn) command of the turning step 11 is given. As the piston rod 23 of the forward / backward moving cylinder 23 moves backward, the movable step 21 moves backward, and when the retreat limit is confirmed, the piston rod 16 of the turning cylinder 16 moves.
A moves forward and the turning step 11 rises. Swivel cylinder 1
When the forward limit of 6 is confirmed, the lock cylinder 14 moves forward and the lock pin 14A immovably locks the turning step 11 at the retreat position. When the advance limit of the lock cylinder 14 is confirmed, the electric interlock for closing the mold is released.

Pressing the reset button of the mat switch resets the electric circuit of the pump operation. Therefore, pressing the operation push button restarts the pump, and the injection molding machine can be closed.

Although an example of the operation has been described above, various operations may be performed semi-automatically or automatically, such as the operation of the present step device being interlocked with the molding cycle, for removing a molded product during semi-automatic operation.

(Effect) Injection molding machines, especially large injection molding machines, even if they have a low base, are not restricted by mounting space.
It is possible to provide a step for inspecting a mold, which is relatively inexpensive, has a compact shape, and has a safe and sufficient strength with no parts missing from the operation side to the non-operation side.

[Brief description of the drawings]

FIG. 1 is a plan view of an apparatus according to an embodiment of the present invention as viewed from above, FIG. 2 is a view in which the upper side of the apparatus is viewed in the direction of arrows II-II in FIG. 1, and FIG. FIG. 3 is an enlarged view showing another operation state different from FIG. 1 in which the upper side of the apparatus is drawn as the upper side of the drawing as viewed in the direction of arrows III-III in FIG. In the drawings, the same reference numerals denote the same or corresponding components. 3: Movable platen, 4: Stay 8: Mobile stand, 9: Guide bar 11: Swivel step, 11C: Rail 12: Bracket, 13: Bracket 14: Lock cylinder, 14A: Lock pin 15: Cushion member 16: Swivel Cylinder 21: Movable step 22: Wheel device 23: Forward / reverse cylinder, 26: Emitter 27: Receiver

Claims (5)

(57) [Claims] 1. An operation-side movable table and a counter-operation-side movable table are movably provided outside the lower two stays of an injection molding machine along the opening and closing directions of a movable plate, and are perpendicular to the respective movable tables. A turning step is mounted so as to be pivotable between the retracted position and the horizontal in-mold working position, and a cushion member is provided on the lower surface of the turning step, the cushion member being in contact with the upper surface of the stay when the turning step is in the in-mold working position. A movable step capable of moving forward and backward guided by the rotating step between a retracted position almost overlapping the rotating step and an advanced position reaching substantially the center of the injection molding machine, and the rotating step is located at a retracted position. A locking device for immovably locking the turning step and a detecting device for electrically detecting the locked position. Apparatus. 2. The folding step device for an injection molding machine according to claim 1, further comprising an electric confirmation device for confirming whether or not there is an object interfering with the circuit of each step and the forward and backward courses. . 3. The foldable injection molding machine according to claim 2, wherein said electrical confirmation device is a light projector and a light receiver provided on one or the other of said operation movable table and said non-operation movable table. Step device. 4. A foldable stepping device for an injection molding machine according to claim 1, further comprising a weight detecting device for electrically detecting a weight on the entire upper surface of each of said steps. . 5. A folding step device for an injection molding machine according to claim 4, wherein said weight detecting device is a mat switch.