JP3001598U - Blow molding machine - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a hollow molding machine, and in particular, is characterized by obtaining a highly accurate molding quality without contamination of a molded product by moving and opening / closing a mold by an electric motor. [Structure] The hollow molding machine according to the present invention comprises a servo motor (1
4) Electrically operated rotating member (12) and meshing member (18)
Reciprocating movement between the air blowing position (28) of the mold (34) and the parison receiving position (A, B) and the mold (3
The configuration is such that the opening / closing of 4) and the mold clamping operation of the mold clamping device (26) can be performed, and a high-precision and high-quality hollow molded product can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a blow molding machine, and more particularly to a new improvement for improving molding quality by electrically moving a mold and a mold clamping device.

[0002]

[Prior art]

 As a mold moving device used in a conventional blow molding machine, generally, hydraulic control is adopted as shown in FIGS. 14 and 15. That is, it is configured to be driven by the hydraulic cylinder 60, and when the molten resin is extruded downward as a cylindrical parison 44 from the extruder 38 through the crosshead 36 to reach a predetermined length, the hydraulic cylinder By driving 60, the mold 34 in the mold open state waiting at the air blowing position A shown by the solid line in FIG. 15 is moved to the parison receiving position B shown by the virtual line in the drawing, The mold 34, in which the parison 44 is sandwiched by the mold closing / clamping by the mold clamping mechanism which is not provided, is moved again by the hydraulic cylinder 60 to be positioned at the air blowing position A shown by the solid line in FIG. ing. This allows the mold 34 to reciprocate between the air blowing position A and the parison receiving position B. The operation of the blow molding machine 100 is as follows: at the parison receiving position A, the parison 44 sandwiched between the molds 34 is cut to a predetermined length by the parison cutting device 42, and the parison 44 is held in the mold. As described above, the container 34 is moved to the air blowing position A, and at this position, air is blown into the parison 44 from an air blowing device (not shown), so that a container having a shape that reacts with the cavity shape of the mold 34 is obtained. Is molded. Next, the mold 34 undergoes a cooling process and is opened by the mold clamping mechanism. As a result, the container in the mold 34 is taken out as a hollow molded product, and the next molding preparation is completed.

[0003]

[Problems to be solved by the device]

 However, in the die moving device of the conventional hollow molding machine as described above, the flow velocity of the oil flowing into the hydraulic cylinder 60 changes according to the change of the oil temperature during the forming operation, that is, the change of the viscosity of the oil. However, there is a problem that the moving speed of the mold 34 changes accordingly, and the timing of the return of the mold 34 to the air blowing position and the start of the operation of the air blowing device is deviated to cause a defective molding. there were. If the oil temperature becomes abnormally high and the oil viscosity becomes unnecessarily low, the flow velocity of the oil flowing into the hydraulic cylinder 60 will increase and the piston of the hydraulic cylinder 60 will move at high speed. At the stop position, the device receives a large impact and the parison 54 swings, the position relative to the mold 34 located at the parison receiving position becomes unstable, and pinching defects easily occur, resulting in molding defects. It was easier to do. In order to prevent such a problem, it is necessary to maintain the temperature of the oil supplied to the hydraulic cylinder 60 within a predetermined temperature range, but the preheating time becomes long and the production efficiency decreases, or the oil temperature is reduced in a short time. There is a problem that the product cost increases because an oil temperature adjusting device is needed to stabilize the temperature.

The present invention has been made to solve the above problems, and in particular, it is a hollow molding in which the molding quality is improved by electrifying the movement of the mold and the drive of the mold clamping device. The purpose is to provide a machine.

[0005]

[Means for Solving the Problems]

 In the blow molding machine according to the present invention, the parison hung from the crosshead is clamped by a mold that is opened and closed by a mold clamping device, and the mold is moved below the air blowing nozzle to blow mold the parison. In the blow molding machine, the mold moving device is engaged with an electric motor, a rotating member that is rotationally driven by the electric motor, and a rotating member that meshes with the rotating member and converts a rotary motion of the rotating member into a linear motion. And a connecting member connected to the first mold holding body of the first and second mold holding bodies of the mold, and the connecting body is opposed to the connecting body. Rear plate disposed apart from each other, a pair of rods connected between the connection body and the rear plate, the second mold holding body slidably provided on one of the rods, and the rear plate. Interval between A variable electric motor, and is configured to perform mold clamping of the mold by the electric motor through the mold holders. The mold is attached to the meshing member of the mold moving device via a moving table provided in the mold clamping device.

More specifically, the position of the mold is detected by a position detector provided in the mold moving device, and the controller moves the mold by using a position signal from the position detector. It is a configuration for controlling an electric motor of the device.

More specifically, the rotating member is a ball screw and the engaging member is a ball nut.

More specifically, the rotating member is a pinion and the engaging member is a rack.

More specifically, the rotating member is a first sprocket, the meshing member is a roller chain, and the second chain is arranged at a position facing the first sprocket and meshes with the roller chain. This is a configuration having a sprocket.

More specifically, the rotating member is a first toothed pulley, the meshing member is a toothed belt, and the toothed belt is arranged at a position facing the first toothed pulley. This is a configuration having a second toothed pulley that is engaged with the belt.

More specifically, the guide bar is provided parallel to the moving axis of the engaging member, and the sliding portion of the moving table is movable to the guide bar.

The blow molding machine according to the present invention is a blow molding machine in which a parison hanging from a crosshead is clamped by a mold, and the mold is moved below an air blowing nozzle to blow mold the parison. A moving table supporting the mold and a mold clamping device for clamping the mold; at least a pair of ball nuts provided on the moving table; ball screws respectively screwed into the ball nut; A pair of electric motors for rotating the ball screws and a lower frame for supporting the electric motors are provided, and the movable table is movably supported by the ball nuts and the ball screws. is there.

The blow molding machine according to the present invention is a blow molding machine in which a parison hanging from a crosshead is clamped by a mold and the mold is moved below an air blowing nozzle to blow mold the parison. A moving table supporting the mold and a mold clamping device for clamping the mold; a ball nut provided on the moving table; a ball screw screwed into the ball nut; and a ball screw. The moving table includes one electric motor for rotating the motor, a lower frame for supporting the electric motor, and one guide bar member provided on the lower frame for guiding the moving table. Is movably supported by the ball screw and the guide bar member.

More specifically, a fixed base on which the rods are slidable is fixed to the upper part of the moving base, and an electric motor is provided on the fixed base.

More specifically, the mold clamping device includes a toggle mechanism provided between the rear plate of the mold opening / closing interlocking mechanism having the rods and the second mold holder of the mold, and It has a guide block provided on the shaft support of the toggle mechanism, a feed screw body screwed into the guide block, and an electric motor for rotating the feed screw body, and is moved by the rotation of the feed screw body. The toggle mechanism is operated via the guide block.

[0016]

[Action]

 In the blow molding machine according to the present invention, the mold and the like are reciprocally moved between the air blowing position and the parison receiving position by being driven by a servo motor that constitutes an electric motor via a rotating member and an engaging member. Since the rotation speed of the servo motor corresponding to the mold position is controlled by the controller, the servo motor can be controlled to gradually decrease the rotation speed near the stop position, and the mold can be moved to the predetermined position without impact. Can be stopped. In addition, the time required to move the mold can be set to a fixed value, which allows defective parts to be pinched due to the swinging motion of the parison, and defective air to be blown due to incorrect molding timing. Generation can be prevented and molding quality can be improved. Furthermore, since the mold clamping device performs the mold clamping operation by the servo motor, highly accurate mold clamping control can be achieved.

[0017]

【Example】

 Hereinafter, preferred embodiments of the blow molding machine according to the present invention will be described in detail with reference to the drawings. The same parts as those in the conventional example will be described with the same reference numerals. First Embodiment FIGS. 1 and 2 show a first embodiment of the present invention. A lower frame 10 is provided as a fixed part of the blow molding machine 100, and two bearing brackets 30 each having a bearing are fixed to a bed member 10a on the lower end side of the lower frame 10. The ball screw 12 is rotatably supported by each bearing bracket 30, and a bracket 48 is fixed to the right end side of the bed portion 10a of the lower frame 10 in FIG. A servomotor 14 such as an AC servomotor is attached to the bracket 48, and the servomotor 14 is arranged such that its axis coincides with the axis of the ball screw 12.

The servomotor 14 and the ball screw 12 are connected to each other by a coupling 16, and a rotary encoder 15 as a position detector is attached to the servomotor 14. The rotary encoder 15 is capable of detecting the rotational position of the servo motor 14, that is, the position of a mold 34 described later, and a ball nut 18 is screwed into the ball screw 12. A connecting member 20 is fixed to the ball nut 18, and a moving table 24 is arranged on the upper end side of the connecting member 20 in the drawing. The moving table 24 is integrally supported by the connecting member 20. The moving table 24 has a cylindrical hole-shaped sliding portion 24a.

Two blocks 32, which are opposed to each other and serve as fixed portions, are fixed to the left and right sides of the upper end of the lower frame 10 in the figure, and the guide bars 22 are provided by the blocks 32. It is fixedly supported. The above-mentioned movable table 24 is movably fitted to the guide bar 22 with the sliding portion 24a, whereby the movable table 24 is driven by the AC servomotor 14 via the connecting member 20 and the ball nut 18. When it is moved, it can be moved in the axial direction while being guided by the guide bar 22.

A mold clamping device 26 is attached to the movable table 24. A mold 34 is attached to the mold clamping device 26, and a right half portion of the mold 34 is shown in FIG. It is possible to move to the mold opening position on the right side of the position, and from this mold opening position, the right half of the mold 34 can be moved to the illustrated mold closing position. The mold moving device 101 is constituted by the ball screw 12, the ball nut 18, etc. described above, and the mold moving device 101 is driven by the servo motor 14 via the coupling 16 to rotate the mold moving device 101. The motion can be converted into a linear motion, and this linear motion is transmitted to the moving table 24. That is, the servomotor 14 reciprocates between the mold clamping device 26 and the mold 34 via the mold moving device 101 between the air blowing position A shown by a solid line in FIG. 1 and the parison receiving position B shown by a virtual line in FIG. The moving table 24 can be driven so as to move.

An upper frame 40 is fixed to an upper right end portion of the lower frame 10 in FIG. 1, and an air blowing device 28 is attached to the upper frame 40 as shown in an upper portion of FIG. A cross head 36 is arranged on the left side of the air blowing device 28. The crosshead 36 is connected to an extrusion port 38a of an extruder 38, and a parison cutting device 42 is arranged below the crosshead 36 in FIG. The molten resin can be supplied to the crosshead 36 from the extrusion port 38a of the extruder 38, and the crosshead 36 can extrude the supplied molten resin as a cylindrical parison 44 downward in the drawing.

The mold 34 is positioned at the parison receiving position B with the mold opened, and then the mold is closed to receive the parison 44, and the parison cutting device 42 cuts the parison 44 into a predetermined length. After that, the air blowing device 28 is configured to be moved to the air blowing position A, and the air blowing device 28 can blow air into the parison 44 in the mold 34 located at the air blowing position A. Further, as shown in FIG. 6, a controller 46 to which the signal 15a of the rotary encoder 15 is input is provided, and this controller 46 outputs a parison from a blow molding machine controller (not shown). The signal 15b is also input. The display device 17 is connected to the controller 46. The controller 46 calculates the moving speed of the mold 34 based on the signal 15a from the rotary encoder 15, and displays it on the display device 17. It is possible to output, and it is also possible to output the control signal 46a to the servo motor 14 at a timing according to the parison injection signal 15b from the blow molding machine control device.

Next, the operation of the above-described first embodiment will be described. The mold 34 stands by at the air blowing position A while being opened by the mold clamping device 26. The position of the mold 34 is detected by the rotary encoder 15, and the position signal 15a is input to the controller 46. The molten resin supplied from the extrusion port 38a of the extruder 38 to the crosshead 36 is extruded downward as a cylindrical parison 44 in FIG. When the parison 44 of a predetermined length is pushed out (a parison injection signal is output from the blow molding machine control device (not shown) to the controller 46), the servo motor 14 is controlled by the control signal 46a from the controller 46. Is driven to rotate in the forward direction. As a result, the ball screw 12 is rotated via the coupling 16, and the ball nut 18 meshing with the ball screw 12 converts the rotational movement into a linear movement.

That is, the ball nut 18 advances to the left in the figure, and the connecting member 20, the moving table 24, the mold clamping device 26, and the mold 34, which are integrated with the ball nut 18, also move from the air blowing position A to the parison receiving position. It will move forward in the direction of position B). The moving speed of the mold 34 can be obtained based on the rotation speed of the servo motor 14 (that is, the rotation speed of the rotary encoder 15), and the mold 34 is controlled by the level of the control signal 46a from the controller 46. Corresponding to, the vehicle moves from the air blowing position A to the parison receiving position B along the solid line arrow in the figure at a speed as shown in FIG. 7, for example. That is, in the vicinity of the predetermined parison receiving position B, the moving speed of the mold 34 is decelerated next and then stopped at the parison receiving position B. This allows the mold 34 to be stopped without impacting the device. The moving speed of the mold 34 is displayed by the display device 17.

Next, the mold clamping device 26 is operated to perform mold closing, the parison 44 is held in the mold 34, and mold clamping is performed. Subsequently, the parison 44 is cut by the parison cutting device 42, and then the servo motor 14 is rotationally driven in the backward direction. As a result, the mold 34 is moved backward along the imaginary line arrow in FIG. 7 at a speed as shown in the figure, the moving speed of the mold 34 is gradually reduced near the air blowing position, and the mold 34 is stopped at the air blowing position A. To be done. Even in this case, the mold 34 can be stopped so as not to impact the device. Next, the nozzle 28a of the air blowing device 28 descends and air is blown into the parison 44. As a result, a resin container having a predetermined shape is molded as a hollow molded product. After the cooling process, the nozzle 28a of the air blowing device 28 rises, the mold is opened by the mold clamping device 26, the hollow molded product falls into the product pool, and one cycle is completed.

Second Embodiment Next, a second embodiment of the present invention shown in FIGS. 3 and 4 will be described. The difference of the second embodiment from the first embodiment is that a rack and pinion mechanism is used instead of the ball screw mechanism which is the mold moving device 101. That is, the reduction gear 70 is attached to the servo motor 14, and the pinion 72 is attached to the output shaft 70 a of the reduction gear 70. A rack 74 is engaged with the pinion 72. The rack 74 is attached to the moving table 24. The other structure is the same as that of the first embodiment.

The operation of the second embodiment is such that when the servo motor 14 is driven, the rotation thereof is decelerated by the speed reducer 70 and transmitted to the pinion 72, and the rack 74 engaged with the pinion 72 linearly moves the rotational motion. Is the same as that of the first embodiment, except that the moving base 24 is linearly driven by being converted into.

Third Embodiment Next, FIG. 5 shows a third embodiment of the present invention. The difference of the third embodiment from the first embodiment is that a sprocket chain mechanism is used instead of the ball screw mechanism which is the mold moving device 101. That is, the speed reducer 70 is attached to the servomotor 14, and the first sprocket 76 is attached to the output shaft 70a of the speed reducer 70. A second sprocket 78 is arranged at a position facing the first sprocket 76, and the second sprocket 78 is rotatably supported by a bearing bracket 80. A roller chain 82 is stretched between the sprockets 76 and 78. A bracket 84 is attached to the moving table 24, and a roller chain fixing tool 86 is attached to the bracket 84. The roller chain fixing tool 86 is fixed to the roller chain 82. That is, the roller chain 82 is attached to the moving table 24 via the bracket 84 and the roller chain fixing tool 86. The other structure is similar to that of the first embodiment.

The operation of the third embodiment is such that when the servo motor 14 is driven, the rotation of the servo motor 14 is decelerated by the speed reducer 70 and transmitted to the sprocket 76, and is hung on the sprockets 76 and 78. It is the same as that of the first embodiment except that the moving base 24 is linearly driven by converting the rotary motion into the linear motion by the roller chain 82.

In the description of the third embodiment, the two sprockets 76, 78 and the roller chain 82 are used, but instead of these, two toothed pulleys (timing pulleys) 88, 90 ( It is also possible to use a toothed belt (timing belt) 94 hung between both pulleys (see the reference numerals in parentheses in FIG. 5). In this case, a bearing bracket 92 that rotatably supports the second toothed pulley 90 is used instead of the bearing bracket 80 that supports the second sprocket 78, and a toothed belt fixing device is used instead of the roller chain fixture 86. The tool 96 will be used.

Further, in the description of each of the above-mentioned embodiments, the mold clamping device 26 is engaged with the interlocking member (the ball nut 18 in the first embodiment, the rack 74 in the second embodiment) via the movable table 24 and the like. Further, in the third embodiment, the mold is attached to the roller chain 82), but the movable table 24 and the like are not provided, and a mold clamping device mounting portion (not shown) is formed in the engaging member to form the mold clamping device 26. It is also possible to attach the to the engaging member directly. Although the AC servomotor 14 is used as the servomotor in the description of each of the above-described embodiments, a DC servomotor may be used.

Further, in the description of each of the above-described embodiments, the rotary encoder 15 is used as the position detector for detecting the position of the mold 34, and the position of the mold 34 is indirectly detected. The position of 34 can also be directly detected using a linear sensor. Further, as described above, the moving operation of the mold moving device 101 as described above can be performed even with the configuration in which only the rotation speed of the servo motor is controlled without using the position detector 15.

Fourth Embodiment A preferred embodiment of the fourth embodiment of the blow molding machine according to the present invention will be described in detail below with reference to the drawings. In addition, the same or equivalent portions as those of the conventional example will be described using the same reference numerals. 8 to 11 show a third embodiment of the blow molding machine according to the present invention, FIG. 8 is a front view showing an operating state, FIG. 9 is a right side view in which a part of FIG. 1 is cut away, 10 is a bottom view of an essential part of FIG. 2, and FIG. 11 is a bottom view showing a modified example of the fourth embodiment of FIG.

A reference numeral 10 in FIGS. 8 to 10 is a lower frame, and a ball serving as a pair of rotating members formed of a ball screw or the like on the lower frame 10 via a pair of bearing brackets 30, 30. The screws 12 are rotatably arranged apart from each other.

Each ball screw 12 is connected to a servo motor 14 (rotation detector etc. is not provided) provided on the lower frame 10 via a coupling 16, and the rotation of the ball screw 12 is performed by the servo motor 14. Is configured to be controlled with high precision. Further, a ball nut 20 as a long-term meshing member is screwed onto the ball screw 12.

An air blowing device 28 having an air blowing nozzle 28 a is provided on the upper frame 40 integrally planted on the lower frame 1, and a mold clamping unit is provided at a position adjacent to the air blowing device 28. A mold 34 is provided that can be opened and closed and clamped by the device 26.

The mold 34 and the well-known mold clamping device 26 are connected to a movable base 24 integrally provided on the ball nut 20, and the metal mold is moved together with the movement of the ball nut 20 and the movable base 24. The mold 34 and the mold clamping device 26 are configured to reciprocate between the air blowing position A and the parison receiving position B along the direction of the arrow X by the pair of ball screws 12 and the servomotor 14.

As shown in FIG. 9, the mold clamping device 26 includes a pair of mold mounting plates 34a and 34b provided on the mold 34, a tie bar 34e provided between the front plate 34c and a rear plate 34d, 34f and mold mounting plates 34a and 34b, and driving means (not shown) such as a rotary screw by a cylinder or a motor provided between the rear plate 34d, and the driving means means the mold mounting plates 34a. , 34b are moved in the direction of arrow D or E to open and close the mold 34.

In the above-described configuration, the case where the moving table 24 is moved by using the pair of ball screws 12 and the pair of servomotors 14 has been described. However, as shown in FIG. 11, only one ball screw 12 is used. It is also possible to use a guide bar member 200 that is not driven and the other is used.

Next, the operation will be described. First, the mold 24 stands by at the air blowing position A in a state where the mold is opened by the mold clamping device 26. The position of the mold 24 is detected by a position detector (not shown) of the servo motor 14, and the molten resin supplied from the extrusion port of the extruder 38 to the crosshead 36 is a cylindrical parison 44. Is pushed down and pushed out. The parison 44 having a predetermined length is rotationally driven while being pushed out. As a result, the ball screw 12 is rotated via the coupling 16, and the linear movement of the ball nut 18 causes the movable table 24, the mold clamping device 26, and the mold 34 to move forward at the same time.

The moving speed of the mold 34 can be obtained based on the rotation speed of the servo motor 14, and the mold 34 moves from the air blowing position A to the parison receiving position B along the solid line arrow C in the figure. Will move. That is, the moving speed of the mold 34 is gradually reduced near the predetermined parison receiving position B, and is stopped at the parison receiving position B, so that the mold 34 is stopped so as not to give an impact to the device. can do. Next, the mold clamping device 26 is operated to open the mold 34, the parison 44 is held in the mold 34, and the mold is clamped. Then, the parison 44 is cut by the cutter 42. Next, the servomotor 14 is rotationally driven in the backward direction, the mold 34 moves backward, the moving speed of the mold 34 near the air blowing position A is gradually reduced, and the mold 34 stops at the air blowing position A. Next, the air blowing nozzle 28a of the air blowing device 28 descends to blow air into the parison 44, and a resin container having a predetermined shape is molded as a hollow molded product. After the cooling process, the air blowing nozzle 28a of the air blowing device 28 rises, the mold is opened by the mold clamping device 26, the hollow molded product falls into a product pool (not shown), and one cycle is completed. The numbers of the ball screw 12 and the guide bar member 200 are not limited to those in the embodiment, and may be increased according to the load. Although the mold clamping device 26 is connected to the ball nut 20 by using the movable table 24 in the above-described embodiment, the mold clamping device 26 may be directly connected without using the movable table 24.

Fifth Embodiment Hereinafter, a preferred embodiment of the fifth embodiment of the blow molding machine according to the present invention will be described in detail with reference to the drawings. In addition, the same or equivalent portions as those of the conventional example will be described with the same reference numerals. 12 and 13 show a fifth embodiment of the blow molding machine according to the present invention. FIG. 12 is a configuration diagram viewed from the front side, and FIG. 13 is an operation configuration diagram viewed from the plan view of FIG.

That is, what is indicated by reference numeral 34 in FIGS. 12 and 13 is an openable / closable mold including a first mold part 34A and a second mold part 34B. A parison 44 hanging from the crosshead 36 of the extruder 38 is supplied therein.

The second mold part 34B is connected to a toggle mechanism 9 composed of a pair of bendable first and second toggle pieces 7 and 8 via a second mold holder 34b and a first clevis 7a. The guide block 301, which holds the shaft support 11 to which the toggle pieces 7 and 8 are bendably connected, is configured to be guided by a pair of center positioning guide bars 13 and 302.

The guide block 301 is configured to be reciprocally movable in the axial direction by a feed screw body 303 such as a ball screw rotated by the servomotor 14, and the first die holder 34A has a first die holder. 34a is provided.

A pair of rods 34e and 34f are connected to a rear plate 34d that is connected to the second toggle piece 8 via a second clevis 8a, and each rod 34e, 34f is connected to the first mold holder 34a. The rod 34e is operatively penetrated through the second mold holding body 34b while being fixedly connected to the connecting body 304 connected to the rear plate 34d, the rods 34e, 34f and The connecting body 304 constitutes a mold opening / closing interlocking mechanism 50 for the mold 34. A fixed base 305 having a hole through which the rods 34e and 34f are slidable is fixed to the movable base 24, and a servo motor 14 is provided above the fixed base 305 to operate the toggle mechanism 9. It is configured to be able to.

Therefore, by operating the servo motor 14 and moving the guide block 301 by the feed screw body 303 in the above-described configuration, the toggle pieces 7 and 8 are formed by dotted lines and solid lines as shown in FIG. The shape becomes linear or bent along the position shown, and in the case of the linear shape, since the mold holding bodies 34b and 34a move in the direction in which they are joined to each other via the mold opening / closing interlocking mechanism 50, each mold part 34A , 34B are closed, and in the case of a bent shape, the mold parts 34A, 34B are opened in the reverse order to the above. Although the mold clamping device using the toggle mechanism has been described in detail above, the mold clamping device can be directly configured by using the servomotor and the rotary screw. Further, although the servo motor is used, an electric motor including other step motors may be used.

[0048]

[Effect of device]

 Since the blow molding machine according to the present invention is configured as described above, the following effects can be obtained. First, in the case of the embodiment shown in FIG. 1 to FIG. 7, the die can be operated by the servomotor, and the die can be stopped so as not to give an impact to the apparatus, and further, the die movement is required. Since the time can be kept constant, it is possible to prevent the occurrence of defective molded products due to pinching defects due to the swinging motion of the parison, air blowing defects due to irregular molding timing, and the like. Further, since the moving speed of the mold corresponding to the rotation speed of the servo motor can be displayed, the reproducibility of the molding timing can be achieved based on this, and the molding quality is improved. As a result, it is possible to shorten the adjustment time for good product production during setup change. A clean molding environment with no hydraulic oil contamination can be created. In addition, in the case of the embodiment shown in FIGS. 9 to 11, since the ball screw supports the mold, the mold clamping device, and the moving base, and the movement is performed by the servo motor, in addition to the above-mentioned effects, the structure is downsized. It is possible to reduce the weight and the vibration. Further, in the case of the embodiment shown in FIGS. 12 and 13, since the operation of the mold clamping device for opening and closing the mold is performed by the servomotor, the opening and closing operation of the mold is highly accurate without being affected by temperature or the like. And it can be performed stably. In addition, by controlling the motor programmatically, it can be opened and closed at any speed and stopped at any position, and safe die opening and closing without malfunction can be obtained. Also, due to the electric motor and toggle structure, it is possible to achieve significant cost reduction, energy saving, and space saving as compared with the conventional hydraulic control structure. Further, the detection of the mold clamping force can be electrically confirmed by the load cell. In addition, the mold opening / closing speed is stored, and good data can be easily reproduced. Also, since the mold is opened and closed by the toggle mechanism and the feed screw, smooth operation is possible with the guide block, and further space saving can be obtained by downsizing the electric motor. Further, since the mold can be smoothly opened and closed, the yield associated with hollow molding can be significantly improved as compared with the conventional method.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a blow molding machine of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a configuration diagram showing a blow molding machine using a mold moving device according to a second embodiment of the present invention.

FIG. 4 is a side view of FIG.

FIG. 5 is a configuration diagram showing a blow molding machine using a mold moving device according to a third embodiment of the present invention.

FIG. 6 is a control block diagram of the mold moving device.

FIG. 7 is a moving velocity diagram of a mold.

FIG. 8 is a configuration diagram showing a fourth embodiment of the present invention.

9 is a side view of the main part of FIG.

FIG. 10 is a plan view of a main part of FIG.

11 is a plan view showing another example of FIG.

FIG. 12 is a configuration diagram showing a fifth embodiment of the present invention.

13 is a plan view of a main part of FIG.

FIG. 14 is a partial cross-sectional configuration diagram showing a conventional blow molding machine.

15 is a configuration diagram showing an operation state of FIG.

[Explanation of symbols]

 12 Ball Screw (Rotating Member) 14 Servo Motor (Electric Motor) 15 Rotary Encoder (Position Detector) 18 Ball Nut (Mating Member) 22 Guide Bar 24 Moving Base 24a Sliding Part 26 Mold Clamping Device 28 Air Blowing Device 28a Air Blowing Nozzle 30 bearing bracket 32 block (fixed part) 34 mold 34d rear plate 36 crosshead 38 extruder 42 parison cutting device 44 parison 46 controller 50 mold opening / closing interlocking mechanism 70 reducer 72 pinion (rotating member) 74 rack (engaging member) ) 76 1st sprocket (rotating member) 78 2nd sprocket 80, 92 bearing bracket 82 roller chain (meshing member) 88 first toothed pulley (rotating member) 90 second toothed pulley 94 toothed belt (meshing member) 301 guide block 303 feed screw body In each figure, The same reference numerals indicate the same parts.

Claims (11)

[Scope of utility model registration request] 1. A parison depending from a crosshead (36).
(44) is clamped by a mold (34) that is opened and closed by a mold clamping device (26), and the mold (34) is moved below the air blowing nozzle (28a) to blow mold the parison (44). In the blow molding machine configured as above, the mold moving device (101) is an electric motor (1
4), a rotary member (12) that is driven to rotate by the electric motor (14), and a meshing member that meshes with the rotary member (12) and that converts the rotary motion of the rotary member (12) into a linear motion. (18) and the mold clamping device (26) is a first mold holder (34a) of the first and second mold holders (34a, 34b) of the mold (34). And a rear plate (34) that is spaced apart from the connection body (304) facing the connection body (304).
d), a pair of rods (34e, 34f) connected between the connection body (304) and the rear plate (34d), and one of the rods
The second mold holder (34b) slidably provided on (34e)
And an electric motor (14) for varying the interval between the rear plate (34d) and the electric motor (14) via the mold holders (34a, 34b) through the mold ( 34) is configured to perform mold clamping, and further, the mold clamping device (26)
Is a movable table installed directly or on this mold clamping device (26).
(24) via the engaging member (1) of the mold moving device (101)
A blow molding machine characterized in that it is configured to be attached to 8). 2. The position of the mold (34) is detected by a position detector (15) provided in the mold moving device (101), and a position signal (15a) from the position detector (15). Using the controller (4
The blow molding machine according to claim 1, wherein the electric motor (14) of the mold moving device (101) is controlled by 6). 3. The blow molding machine according to claim 1, wherein the rotating member is a ball screw (12), and the engaging member is a ball nut (18). 4. The rotating member is a pinion (72),
The blow molding machine according to claim 1 or 2, wherein the engaging member is a rack (74). 5. The first sprocket (76) comprises the rotating member.
And the engagement member is a roller chain (82), and has a second sprocket (78) arranged at a position facing the first sprocket (76) and engaged with the roller chain (82). Claim 1 or 2 characterized
The blow molding machine described. 6. The pulley (88) having a first tooth, the rotating member.
And the engagement member is a toothed belt (94),
The second toothed pulley (90), which is arranged at a position facing the first toothed pulley (88) and meshes with the toothed belt (94), according to claim 1 or 2. Hollow molding machine. 7. A slide bar of the moving table (24), wherein a guide bar (22) is provided in parallel with the moving axis of the engaging member (18).
The blow molding machine according to any one of claims 1 to 6, wherein the (24a) is movable to the guide bar (22). 8. A parison depending from a crosshead (36).
(44) is held by a mold (34), and the mold (34) is moved below the air blowing nozzle (28a) to blow mold the parison (44) in a hollow molding machine, Mold (3
4) and a movable table (24) supporting a mold clamping device (26) for clamping the mold (34), at least a pair of ball nuts (18) provided on the movable table (24), and A ball screw (12) that is respectively screwed into the ball nut (18), a pair of electric motors (14) for rotating the ball screws (12), and a lower portion that supports the electric motors (14). A hollow molding machine comprising a frame (10), and the moving table (24) being movably supported by the ball nuts (18) and the ball screws (12). 9. A parison depending from a crosshead (36).
(44) is sandwiched by a mold (34), the mold (34) is moved below the air blowing nozzle (28a) to blow mold the parison (44) in the hollow molding machine, Mold (3
4) and a movable table (24) supporting a mold clamping device (26) for clamping the mold (34), a ball nut (18) provided on the movable table (24), and the ball nut ( One ball screw (12) screwed to 18) and one for rotating said ball screw (12)
One electric motor (14), a lower frame (10) supporting the electric motor (14), and one guide bar provided on the lower frame (10) for guiding the moving base (24). Element
(200), the moving table (24) is the ball screw (12)
And a hollow molding machine, which is movably supported by a guide bar member (200). 10. A fixed base (305) on which the rods (34e, 34f) are slidable is fixed to an upper portion of the movable base (24), and an electric motor is mounted on an upper portion of the fixed base (305). The blow molding machine according to any one of claims 1 to 9, further comprising (14). 11. The mold clamping device (26) includes the rods (3).
4e, 34f) toggle mechanism (9) provided between the rear plate (34d) of the mold opening / closing interlocking mechanism (50) and the second mold holding body (34b) of the mold (34), Shaft support of the toggle mechanism (9)
A guide block (301) provided in (11), a feed screw body (303) screwed into the guide block (301), and an electric motor (14) for rotating the feed screw body (303). The toggle mechanism (9) is configured to be operated via a guide block (301) that is moved by rotation of the feed screw body (303), according to any one of claims 1 to 10. The blow molding machine described.