JP2872606B2 - Method and apparatus for exchanging mold for hollow molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for exchanging dies of a hollow molding machine, and more particularly, to an apparatus for exchanging dies while moving an air blower to lift the dies. Regarding new improvements.

[0002]

2. Description of the Related Art Conventionally, as a blow molding machine of this kind, a construction shown in FIGS. 3 and 4 has been generally employed. That is, in FIG. 3 and FIG.
Is a lower frame, and two bearing brackets 30 each having a bearing are fixed to the lower bed portion 10a of the lower frame 10. The ball screw 12 is rotatably supported by each of the bearing brackets 30. A bracket 48 is fixed to the right end of the bed 10a of the lower frame 10, and the AC servomotor 14 is attached to the bracket 48. The AC servomotor 14 is arranged such that its axis coincides with the axis of the ball screw 12. The AC servomotor 14 and the ball screw 12 are connected to each other by a coupling 16. A rotary encoder (position detector) 15 is attached to the AC servomotor 14, and the rotational position of the AC servomotor 14 is determined. That is, a mold 34 described later is used.
This is a configuration that can detect the position of.

[0003] A ball nut 18 is screwed into the ball screw 12, and a connection member 20 is fixed to the ball nut 18, and a movable table 24 is disposed on the upper end side of the connection member 20. The moving table 24 is integrally supported by the connecting member 20. The moving table 24
Is formed with a cylindrical hole-shaped sliding portion 24a. Two blocks 32 arranged opposite to each other are fixed to the left and right sides of the upper end of the lower frame 10, respectively, and the guide bar 22 is fixedly supported by each block 32. The moving table 24 is movably fitted to the guide bar 22 with a sliding portion 24a. When the moving table 24 is driven by the AC servomotor 14 via the connecting member 20 and the ball nut 18, the moving table 24 is fitted to the guide bar 22. It is movable in the axial direction while being guided.

[0004] A mold clamping device 26 is attached to the moving table 24, and a mold mounting plate 34 is attached to the mold clamping device 26.
A mold 34 is attached via A and 34B, and the mold clamping device 26 moves one of the mold parts 34a and 34b of the mold 34 to the mold open position on the right side of the illustrated position. In addition to being movable, the mold part 34a can be moved from the mold open position to the illustrated mold closed position. The lower frame 10
A frame 40 is fixed above the upper frame 40, and an air blowing device 28 having a nozzle 28a is attached to the upper frame 40. This air blowing device 28
The crosshead 36 is fixedly arranged on the left side of
The crosshead 36 is connected to an extrusion port of an extruder 38, and a parison cutting device 42 is provided below the crosshead 36.
Is arranged.

The extruder 38 can supply the molten resin to the crosshead 36, and the crosshead 36 can extrude the supplied molten resin into the mold 34 as a cylindrical parison 50. The mold 34 is positioned at the parison receiving position with the mold opened, and then receives the parison 50 by closing the mold, and receives the parison cutting device 42.
After the parison 50 is cut to a predetermined length, the parison 50 is moved to the air blowing position, and the air blowing device 28 can blow air into the parison 50 in the mold 34 located at the air blowing position. is there.

Next, the operation will be described. The mold 34 is
In a state where the mold is opened by the mold clamping device 26, the apparatus stands by at the air blowing position. The position of the mold 34 is detected by the rotary encoder 15, and the position signal is input to the controller 46. The molten resin supplied from the extrusion port of the extruder 38 to the crosshead 36 is extruded downward in FIG. 1 as a cylindrical parison 50. With the parison 50 having a predetermined length pushed out, the AC servomotor 14 is driven to rotate in the forward direction. As a result, the ball screw 12 is rotated via the coupling 16, and the rotational motion is converted into a linear motion by the ball nut 18 meshing with the ball screw 12. That is, the ball nut 18 moves forward in the left direction in the drawing, and the connecting member 20 and the moving table 2 integrated therewith.
4. The mold clamping device 26 and the mold 34 also advance (from the air blowing position toward the parison receiving position). Next, the mold is closed by the operation of the mold clamping device 26, the parison 50 is held in the mold 34, and the mold is clamped. Subsequently, the parison 50 is cut by the parison cutting device 42,
The servo motor 14 is driven to rotate in the backward direction, and the mold 3 is rotated.
4 moves backward and stops at the air blowing position. Next, the nozzle of the air blowing device 28 descends to blow air into the parison 50. As a result, a resin container having a predetermined shape is formed as a hollow molded product. After a cooling process, the nozzle of the air blowing device 28 is raised, the mold is opened by the mold clamping device 26, and the hollow molded product falls into a product pool. , One cycle ends.

[0007]

A conventional blow molding machine is:
Because of the above configuration, the following problems exist. That is, when the mold is replaced (attachment and removal of the mold), the air blowing device and the crosshead are above the mold, and cannot be hung upward by a crane. With the clamping device (die) moved, the die is placed on the claw of a forklift, and the die is placed from the left side of the molding machine. The parison cutting device is located at a distance of more than 10 mm above the mold mounting plate, and the tie bar of the mold clamping device is located below the claw of the forklift. Therefore, since the work is performed in an extremely narrow place, if the forklift loses its balance, the mold will fall over, and there has been a problem in safety such as danger of falling. Therefore, it is necessary to take care of dangerous work in such a place and to work slowly, so that the replacement time is long.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in particular, has a hollow structure in which a mold can be exchanged while a mold is lifted by moving an air blowing device. An object of the present invention is to provide a method and an apparatus for exchanging a mold of a molding machine.

[0009]

According to a method of exchanging a mold of a hollow molding machine according to the present invention, a mold movably provided on a frame is reciprocated between a crosshead and an air blowing device to perform hollow molding. In the above-described hollow molding machine, the air blow device is moved to a position not corresponding to the mold with respect to the mold corresponding to the lower portion of the air blow device, and the mold is lifted up and replaced. How to

A mold exchanging device for a hollow molding machine according to the present invention is a hollow molding machine in which a mold movably provided on a frame is reciprocated between a crosshead and an air blowing device to perform hollow molding. And a rail provided on the frame for moving the air blowing device.

More specifically, the air blower includes a screw provided on the frame and rotated by a motor, and a nut provided on the air blowing device and screwed with the screw.

[0012]

In the method and the apparatus for exchanging the mold of the hollow molding machine according to the present invention, the air blowing device moves via the rail and can be shifted from the position corresponding to the mold. A space is formed, and the mold can be replaced by lifting the mold upward using a crane. Therefore, the work of exchanging the mold becomes extremely easy, and the work becomes safe.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method and an apparatus for exchanging dies of a hollow molding machine according to the present invention will be described in detail with reference to the drawings. The same or equivalent parts as those in the conventional example will be described using the same reference numerals. In FIG. 1, a lower frame is indicated by reference numeral 10, and two bearing brackets 30 each having a bearing are fixed to a bed 10 a on the lower end side of the lower frame 10. The ball screw 12 is rotatably supported by each of the bearing brackets 30. A bracket 31 is fixed to the right end of the bed 10a of the lower frame 10, and the AC servomotor 14 is attached to the bracket 31. The AC servomotor 14 is arranged such that its axis coincides with the axis of the ball screw 12. The AC servo motor 14 and the ball screw 12
A rotary encoder (position detector) 15 is attached to the AC servomotor 14 to detect the rotational position of the AC servomotor 14, that is, the position of a mold 34 described later. It is a configuration that can be done.

A ball nut 18 is screwed into the ball screw 12, and a connection member 20 is fixed to the ball nut 18, and a movable table 24 is disposed on an upper end side of the connection member 20. The moving table 24 is integrally supported by the connecting member 20. The moving table 24
Is formed with a cylindrical hole-shaped sliding portion 24a. Two blocks 32 arranged opposite to each other are fixed to the left and right sides of the upper end of the lower frame 10, respectively, and the guide bar 22 is fixedly supported by each block 32. The moving table 24 is movably fitted to the guide bar 22 with a sliding portion 24a. When the moving table 24 is driven by the AC servomotor 14 via the connecting member 20 and the ball nut 18, the moving table 24 is fitted to the guide bar 22. It is movable in the axial direction while being guided.

A mold clamping device 26 is attached to the moving table 24. A mold mounting plate 34 is attached to the mold clamping device 26.
A mold 34 is attached via A and 34B, and the mold clamping device 26 moves one of the mold parts 34a and 34b of the mold 34 to the mold open position on the right side of the illustrated position. In addition to being movable, the mold part 34a can be moved from the mold open position to the illustrated mold closed position. The lower frame 10
A frame 40 is fixed above the upper frame 40, and an air blowing device 28 having a nozzle 28a is attached to the upper frame 40. This air blowing device 28
The crosshead 36 is fixedly arranged on the left side of
The crosshead 36 is connected to an extrusion port of an extruder 38, and a parison cutting device 42 is provided below the crosshead 36.
Is arranged.

The extruder 38 can supply the molten resin to the crosshead 36, and the crosshead 36 can extrude the supplied molten resin into the mold 34 as a cylindrical parison 50. The mold 34 is positioned at the parison receiving position with the mold opened, and then receives the parison 50 by closing the mold, and receives the parison cutting device 42.
After the parison 50 is cut to a predetermined length, the parison 50 is moved to the air blowing position, and the air blowing device 28 can blow air into the parison 50 in the mold 34 located at the air blowing position. is there.

The air blowing device 28 is reciprocally movable in the direction of arrow A on a rail 41 provided on the frame 40 via a slide shifter 42 provided on the lower surface thereof. A nut 44 is provided on the bracket 43 of the blowing device 28. A motor 46 is provided on the frame 40 via a motor bracket 45, and a longitudinal screw 48 is connected to the motor 46 via a coupling 47, and one end of the screw 48 is connected to the nut 44. Is provided by screwing.

Next, the operation will be described. The mold 34 is
In a state where the mold is opened by the mold clamping device 26, the apparatus stands by at the air blowing position. The position of the mold 34 is detected by the rotary encoder 15, and the position signal is input to the controller 46. The molten resin supplied from the extrusion port of the extruder 38 to the crosshead 36 is extruded downward in FIG. 1 as a cylindrical parison 50. With the parison 50 having a predetermined length pushed out, the AC servomotor 14 is driven to rotate in the forward direction. As a result, the ball screw 12 is rotated via the coupling 16, and the rotational motion is converted into a linear motion by the ball nut 18 meshing with the ball screw 12. That is, the ball nut 18 moves forward in the left direction in the drawing, and the connecting member 20 and the moving table 2 integrated therewith.
4. The mold clamping device 26 and the mold 34 also advance (from the air blowing position toward the parison receiving position).

Next, the mold is closed by the operation of the mold clamping device 26, the parison 50 is held in the mold 34, and the mold is clamped. Subsequently, the parison 5 is moved by the parison cutting device 42.
0 is cut, the AC servomotor 14 is driven to rotate in the retreating direction, the mold 34 retreats, and is stopped at the air blowing position. Next, the nozzle of the air blowing device 28 held at the position indicated by the solid line is lowered to blow air into the parison 50. As a result, a resin container having a predetermined shape is formed as a hollow molded product. After a cooling process, the nozzle of the air blowing device 28 is raised, the mold is opened by the mold clamping device 26, and the hollow molded product falls into a product pool. , One cycle ends.

Next, when the mold 34 is replaced to perform hollow molding by another mold 34, a screw 48 is
Is rotated, the air blowing device 28 moves from the solid line in FIG. 1 to the position shown by the dotted line, and moves from a position corresponding to the mold 34 above the mold 34 to a position not corresponding to the mold 34. In this state, a crane (not shown) is positioned above the mold 34, and the crane is connected to the mold 34, whereby the mold 34 can be lifted upward by the crane and replaced with another mold. In addition, although the case where the air blowing device 28 is moved in parallel with the moving direction of the mold 34 has been described, it goes without saying that the air blowing device 28 can be moved in a rear direction different from the moving direction.

[0021]

The method and the apparatus for exchanging the mold of the hollow molding machine according to the present invention are constituted as described above, so that the following effects can be obtained. That is, since the air blowing device can be moved to a position that does not correspond to the mold, the mold can be easily replaced by lifting the mold using a crane, thereby reducing the time required for mold replacement and ensuring safety. Work, simple exchange work that can be performed by anyone can be achieved.

[Brief description of the drawings]

FIG. 1 is a front view showing a mold exchanging device of a hollow molding machine according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view showing a conventional blow molding machine.

FIG. 4 is a side view of FIG. 3;

[Explanation of symbols]

 28 Air blowing device 34 Mold 36 Crosshead 40 Frame 41 Rail 44 Nut 46 Motor 48 Screw

Claims (3)

(57) [Claims] 1. A hollow molding apparatus in which a mold (34) movably provided on a frame (40) is reciprocated between a crosshead (36) and an air blowing device (28) to perform hollow molding. In the machine, the air blowing device (28) is connected to the die (3) with respect to the die (34) corresponding to the lower side of the air blowing device (28).
4) A method of exchanging a mold of a hollow molding machine, wherein the method is moved to a non-corresponding position, and the mold (34) is lifted up and exchanged. 2. A hollow molding apparatus in which a mold (34) movably provided on a frame (40) is reciprocated between a crosshead (36) and an air blowing device (28) to perform hollow molding. A die changing device for a hollow molding machine, comprising: a rail (41) provided on the frame (40) for moving the air blowing device (28). 3. A motor (46) provided on the frame (40).
A screw (48) rotating through the air blowing device (28)
3. A die changing device for a hollow molding machine according to claim 2, further comprising a nut (44) screwed into said screw (48).