JP2009126129A - Blow molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To synchronously move first and second blow cavity mold fixing plates and a bottom mold fixing plate, and to receive a blow pressure applied on the bottom mold by pressure receiving members mounted on the first and second blow cavity mold fixing plates. <P>SOLUTION: A blow molding machine includes the first and second blow cavity mold fixing plates 20 and 22 fixing the first and second blow cavity molds, the bottom mold fixing plate 30 fixing the bottom mold, a motor 40 generating driving force for mold-clamping the first and second blow cavity mold fixing plates and the bottom mold fixing plate, a mold clamping mechanism 50 which converts the driving force of the motor into force for the synchronous movement of the first and second blow cavity mold fixing plates and the bottom mold fixing plate, pressure receiving members 20A and 20B which are installed on the first and second blow cavity mold fixing plates, are engaged with the bottom mold fixing plate when the first and second blow cavity molds are clamped, and receive the blow pressure applied on the bottom mold, and a moving/biasing member 100 which is installed in the mold clamping mechanism 50 and moves/biases the bottom mold fixing plate to the side of a mold clamping position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a blow molding machine.

  The blow molding machine molds a hollow container by clamping a first and second blow cavity mold and a bottom mold and blow-molding a preform.

When the shape of the bottom of the hollow container protrudes inward, there is one that drives the bottom mold up and down to release the bottom mold from the hollow container. As the bottom-type lifting drive, one using an air cylinder or hydraulic cylinder (Patent Documents 1 and 2), or one using a nut portion that rotates a screw shaft with a servo motor and moves up and down along the screw shaft (Patent Document 3). )It has been known.
JP 2005-66869 A JP-A-8-230026 JP 2000-43131 A

  Here, since blow pressure acts on the bottom mold, it is necessary to receive this pressure. It is conceivable to provide the pressure receiving member in a blow cavity mold that is a pair of split molds that are opened and closed with respect to the bottom mold.

  However, at the time of mold clamping, the pair of blow cavity molds and the bottom mold interfere with each other unless the bottom mold is set at the mold clamping position before the pair of blow cavity molds are clamped.

  An object of the present invention is to move the first and second blow cavity mold fixing plates and the bottom mold fixing plate synchronously, and use a pressure receiving member provided on the first and second blow cavity mold fixing plates to form the bottom mold. An object of the present invention is to provide a blow molding machine capable of receiving the blow pressure.

The present invention relates to a blow molding machine that clamps the first and second blow cavity molds and the bottom mold and performs blow molding.
First and second blow cavity mold fixing plates to which the first and second blow cavity molds are fixed;
A bottom mold fixing plate to which the bottom mold is fixed;
A motor for generating a driving force for clamping the first and second blow cavity mold fixing plates and the bottom mold fixing plate;
A mold clamping mechanism for converting the driving force of the motor into a synchronous moving force between the first and second blow cavity fixing plates and the bottom mold fixing plate;
It is provided on the first and second blow cavity mold fixing plates, and engages with the bottom mold fixing plate when the first and second blow cavity molds are clamped so as to apply a blow pressure to the bottom mold. A pressure receiving member to receive,
A moving urging member that is provided in the mold clamping mechanism and urges the bottom mold fixing plate to move toward the mold clamping position during mold clamping;
Is provided.

  In the present invention, the mold clamping mechanism drives the first and second blow cavity fixing plates and the bottom die fixing plate in synchronization with each other based on the output of the motor that is a single drive source. The mold clamping mechanism is provided with a moving urging member that urges the bottom mold fixing plate to move toward the mold clamping position during mold clamping, so that the bottom mold fixing plate is molded at the end of mold clamping by the mold clamping mechanism. It can be made to stand by at the tightening position. While the bottom mold fixing plate is waiting at the mold clamping position by the moving urging member, the final stage mold clamping of the first and second blow cavity mold fixing plates is performed. As a result, the pressure receiving members provided on the first and second blow cavity mold fixing plates can be engaged with the bottom mold fixing plate to receive the blow pressure to the bottom mold.

  In the present invention, the mold clamping mechanism includes a first piston-crank mechanism that drives the bottom mold fixing plate, and the first piston-crank mechanism is driven beyond a dead point during the mold clamping. Can be. In this case, the bottom mold fixing plate is set to the mold clamping position when the first piston-crank mechanism reaches the dead center, and the pressure receiving member is configured so that the first piston-crank mechanism is After reaching the dead point, it is engaged with the bottom mold fixing plate.

  In this way, when the first piston-crank mechanism exceeds the dead point, the bottom mold movable plate tries to drive the bottom mold fixed plate away from the mold clamping position, but the bottom biasing plate is moved by the moving biasing member. Maintained in the clamping position. Although a cam can be used in place of the piston-crank mechanism, the piston-crank mechanism is superior in terms of downsizing the apparatus.

  In the present invention, the first piston-crank mechanism includes a rotating plate driven based on the driving force of the motor, a bottom-type movable plate guided by linear movement, and a first shifted from the rotation center of the rotating plate. 1 and a first link having both ends rotatably connected to the bottom movable plate. In this case, the movement urging member can move and urge the bottom mold fixed plate toward the mold clamping position with respect to the bottom mold movable plate.

  In the present invention, the moving urging member may be an air cylinder connected between the bottom mold movable plate and the bottom mold fixed plate. The moving urging member can be composed of an elastic body such as a spring, but it takes into account the spring constant that supports the bottom mold fixing plate and the bottom mold, and the motor capacity increases, so an air cushion such as an air cylinder is used. Is suitable for miniaturization. Further, since the blow pressure is received by the pressure receiving member, the blow pressure does not act on the air cylinder itself even if the air cylinder is used.

  In the present invention, the air cylinder may move and urge the bottom mold fixed plate toward the mold clamping position with respect to the bottom mold movable plate until at least the pressure receiving member is engaged with the bottom mold fixed plate. Good.

  That is, after the pressure receiving member is engaged with the bottom mold fixing plate, the moving urging force by the moving urging member may be released.

  In the present invention, the air cylinder includes a cylinder body and a cylinder rod, the cylinder body includes a first chamber and a second chamber partitioned by the cylinder rod, and the air cylinder includes the cylinder rod. A first position for introducing air into the first chamber in the pulling direction, a second position for introducing air into the second chamber in the pulling direction of the cylinder rod, the first chamber and the second chamber. It is preferably connected to a valve that can be switched to a third position that opens to the atmosphere.

  Thus, by selecting the first position at the time of mold clamping, the bottom mold fixing plate can be maintained at the mold clamping position using the air cushion of the air cylinder, and the pressure receiving member can be engaged. If the second position is selected after the engagement of the pressure receiving member is completed or the mold clamping is completed, the moving biasing force can be released. When the mold is opened, the third position can be selected. Thus, the pressure receiving member can be disengaged by using the air cushion of the air cylinder to maintain the bottom mold fixing plate in the mold clamping position until the first piston-crank mechanism passes through the dead center. it can.

  In the present invention, the mold clamping mechanism includes a second piston-crank mechanism for driving the first and second blow cavity fixing plates, and the first and second piston crank mechanisms are for driving the motor. The rotating plate driven based on force can be shared.

  By doing so, the first and second piston-crank mechanisms constituting the mold clamping mechanism can be driven synchronously.

  In the present invention, the second piston-crank mechanism includes both ends of the rotary plate, a linearly guided traction member, a second position shifted from the rotation center of the rotary plate, and the traction member. And a second link that is rotatably coupled.

  That is, the same rotating plate can be shared by the first and second piston-crank mechanisms.

  In the present invention, the mold clamping mechanism is configured such that both ends thereof are rotatable to at least one toggle mechanism that drives the first and second blow cavity mold fixing plates, the pulling member, and the at least one toggle mechanism, respectively. A linked third link.

  By doing so, the driving force generated in the second piston-crank mechanism can be doubled by at least one toggle mechanism, and the first and second blow cavity mold fixing plates can be clamped and driven. Note that a total of two toggle mechanisms provided for driving the first and second blow cavity mold fixing plates may be used, or one blow cavity mold fixing plate is driven by one toggle mechanism, and the other The blow cavity mold fixing plate may be pulled by a toggle output.

  Hereinafter, embodiments of the present invention will be described. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are indispensable as means for solving the present invention. Not always.

(Outline of blow molding machine)
FIG. 1 is a schematic front view showing a mold clamping state of a blow molding machine according to an embodiment of the present invention, and FIG. 2 is a schematic side view showing a mold clamping mechanism below the base.

  In FIG. 1, first and second blow cavity mold fixing plates 20 and 22 and a bottom mold fixing plate 30 are provided on a base 10. First and second blow cavity molds (not shown) which are a pair of split molds having a parting surface on the center line L are fixed to the first and second blow cavity mold fixing plates 20 and 22. Is done. A bottom mold (not shown) that is clamped together with the first and second blow cavity molds is fixed to the bottom mold fixing plate 30.

  Sliders 24A and 26A are fixed to the lower ends of the first and second blow cavity mold fixing plates, and guides 24B and 26B for linearly guiding the sliders 24A and 26A are fixed on the base 10.

  On the bottom mold fixing plate 30, for example, a pressure receiving member 30A protruding in the width direction is formed. The first and second blow cavity mold fixing plates 20 and 22 are engaged with the pressure receiving member 30A during mold clamping shown in FIG. 1 to support the pressure receiving member 30A and receive the blow pressure. Receiving members 20A and 22A are provided.

(Clamping mechanism and moving biasing member)
In FIG. 2, a motor for generating a driving force for clamping the first and second blow cavity mold fixing plates 20 and 22 and the bottom mold fixing plate 30, for example, a servo motor 40 is provided. A mold clamping mechanism 50 is provided for converting the driving force of the motor 40 into a synchronous movement force between the first and second blow cavity fixing plates 20 and 22 and the bottom mold fixing plate 30. The mold clamping mechanism 50 is provided with a moving urging member such as an air cylinder 100 that urges the bottom mold fixing plate 30 to move toward the mold clamping position.

  As shown in FIG. 1, the mold clamping mechanism 50 includes a first piston-crank mechanism 60 that drives the bottom mold fixing plate 30. The mold clamping mechanism 50 further includes a second piston-crank mechanism 70 that drives the first and second blow cavity fixing plates 20 and 22. The first and second piston crank mechanisms 60 and 70 can share the rotating plate 62 that is driven based on the driving force of the motor 40. As shown in FIG. 2, the output of the motor 40 is decelerated by the speed reducer 42 and transmitted to the rotating shaft 44. Two rotary plates 62 and 62 are fixed to the rotary shaft 44. Further, the mold clamping mechanism 50 is based on the output of the second piston crank mechanism 70, and drives at least one of the first and second blow cavity mold fixing plates 20, 22, for example, two toggle mechanisms 110A, 110B. Is included.

  The first piston-crank mechanism 60 has both ends of a rotary plate 62, a bottom movable plate 64 guided by linear movement, a first position 62A shifted from the rotation center of the rotary plate 62, and the bottom movable plate 64. Each including a first link 66 rotatably connected thereto.

  As shown in FIG. 2, the air cylinder 100 as a moving biasing member includes a cylinder body 102 fixed to the bottom mold movable plate 64 and a cylinder rod 104 fixed to the bottom mold fixed plate 30, and includes a bottom mold. The bottom mold fixed plate 30 is moved and biased toward the mold clamping position with respect to the movable plate 64. As shown in FIG. 2, guide rods 68, 68 are fixed to the lower surface of the bottom mold fixing plate 30 so as to hang down, and the bottom movable plate 64 is linearly guided to the guide rods 68, 68.

  The second piston-crank mechanism for driving the two toggle mechanisms 110A, 110B includes a rotating plate 62, a linearly guided traction member 72, and a second position 62B shifted from the rotation center of the rotating plate 62. And a second link 74 having both ends rotatably connected to the traction member. The pulling member 72 is guided to move linearly by a plurality of guide rods 76, 76 suspended from the base 10.

  The toggle mechanism 110A is rotated by the first and second toggle arms 112A and 114A rotatably supported by the first blow cavity mold fixing plate 20 and the first mold pressure receiving member 130A fixed by the base 10. The third and fourth toggle arms 116A and 118A are freely supported. The first and third toggle arms 112A and 116A are rotatably supported on the shaft 120A, and the second and fourth toggle arms 114A and 118A are rotatably supported on the shaft 122A. The shafts 120A and 122A are connected by a connecting arm 124A that is rotatably supported by the shafts 120A and 122A. Further, a third link 78A having both ends rotatably connected to the shaft 122A and the pulling member 72 of the toggle mechanism 110A is provided.

  Similarly, the toggle mechanism 110B includes first and second toggle arms 112B and 114B rotatably supported by the second blow cavity mold fixing plate 22, and a second mold pressure receiving member fixed to the base 10. The third and fourth toggle arms 116B and 118B are rotatably supported by 130B. The first and third toggle arms 112B and 116B are rotatably supported on the shaft 120B, and the second and fourth toggle arms 114B and 118B are rotatably supported on the shaft 122B. The shafts 120B and 122B are coupled by a coupling arm 124B that is rotatably supported by the shafts 120B and 122B. Further, a third link 78B having both ends rotatably connected to the shaft 122B and the pulling member 72 of the toggle mechanism 110B is provided.

(Valve switching of air cylinder, which is a moving bias member)
FIG. 3 shows an air circuit diagram of an air cylinder 100 which is a moving urging member. The air cylinder 100 includes a cylinder body 102 and a cylinder rod 104, and the cylinder body 102 includes a first chamber 106 and a second chamber 108 that are partitioned by the cylinder rod 104.

  A first air valve 140 is connected to the first chamber 106 of the air cylinder 100, and a second air valve 142 is connected to the second chamber. The first and second air valves 140 and 142 control the passage / non-passage of air.

  A third air valve 144 is connected to the first and second air valves 106 and 108. The third air valve 144 can select one of three positions. In the first position B, air is introduced into the first chamber 106 in the direction in which the cylinder rod 104 is pulled out, and the second chamber 108 is opened to the atmosphere. In the second position C, air is introduced into the second chamber 108 in the direction in which the cylinder rod 104 is retracted, and the first chamber 106 is opened to the atmosphere. In the third position D, both the first chamber 106 and the second chamber 198 are opened to the atmosphere, and the cylinder rod 104 is in a free state. In order for the air cylinder 100 to function as a movement urging member, the third air valve 144 may be set to the first position B and urged by air in the direction in which the cylinder rod 104 is pulled out.

(Synchronous driving of the first and second blow cavity mold fixing plates and the bottom mold fixing plate)
In the present embodiment, the first and second blow cavity mold fixing plates 20 and 22 and the bottom mold fixing plate 30 are driven in synchronization by a servo motor 40 as a single drive source. This is because the pressure receiving member 30A provided on the bottom mold fixing plate 30 and the pressure receiving member 20A provided on the first and second blow cavity mold fixing plates 20 and 22 at the time of clamping shown in FIG. , 22A needs to be engaged. That is, at the time of mold clamping, the first and second blow cavities are arranged so that the pressure receiving members 20A and 22A are engaged with the pressure receiving member 30A after the bottom mold fixing plate 30 reaches the mold clamping position. It is necessary to synchronize the movement of the mold fixing plates 20 and 22 and the bottom mold fixing plate 30.

  When the motor 40 is driven to rotate in the forward direction, the rotating plate 62 rotates in the clockwise direction A in FIG. 1 via the speed reducer 42 and the rotating shaft 44, and mold closing is started. At the start of mold closing, the first link 66 is in a position indicated by a chain line in FIG. 1, and the rotating plate 62 is rotated counterclockwise therefrom. As a result, the bottom mold fixed plate 30 and the bottom mold movable plate 64 located below the position shown in FIG. On the other hand, at the start of mold closing, the traction member 72 is above the position shown in FIG. 1, and the traction member 72 is lowered from the position via the second link 74 by the rotation of the rotating plate 62. When the pulling member 72 is lowered, the first to fourth toggle arms 112A to 118B having angles with the shafts 120A, 120B, and 122A122B as vertices in the mold open state are rotated by the third links 78A and 78B. When 122A122B is lowered, it is displaced toward a straight mold clamping state as shown in FIG.

  In this way, from the start of mold closing to mold clamping, the first and second blow cavity mold fixing plates 20 and 22 are operated by the actions of the first and second crank-piston mechanisms 60 and 70 and the toggle mechanisms 110A and 110B. The movement with the bottom mold fixing plate 30 is synchronized.

  The same applies to the mold opening operation, and the motor 40 may be rotated from the mold clamping state shown in FIG. 1 to rotate the rotating plate 62 in the counterclockwise direction opposite to the arrow A direction in FIG.

  Note that the movement biasing member 100 needs to operate for both the mold closing and clamping operation and the mold opening operation, which will be described below.

(Engagement operation between pressure receiving member and pressure receiving member)
As described above, at the time of mold clamping, after the bottom mold fixing plate 30 reaches the mold clamping position, the first and second pressure receiving members 20A and 22A are engaged with the pressure receiving member 30A. It is necessary to synchronize with the movement of the blow cavity mold fixing plates 20 and 22 and the bottom mold fixing plate 30.

  For this purpose, first, the first piston-crank mechanism 60 is driven beyond the dead point during mold clamping. That is, the fulcrum 62B on the rotating plate 62 of the first link 62 indicated by a chain line in FIG. 1 reaches the top dead center during the rotation of the rotating plate 62 in the direction of arrow A.

  At this time, the air cylinder 100 which is a movement urging member is urged by air in a direction in which the third air valve 144 is set to the first position B in FIG. 3 and the cylinder rod 104 is pulled out from the cylinder body 102. . Therefore, when the first piston-crank mechanism 60 reaches the top dead center, the bottom mold movable plate 64 is set at the uppermost position, and is fixed to the bottom mold that is connected to the bottom mold movable plate 64 via the air cylinder 100. The plate 30 is set to the mold clamping position which is the highest level. That is, the bottom mold fixing plate 30 has reached the mold clamping position prior to the first and second blow cavity mold fixing plates 20 and 22 being clamped.

  Here, the rotating plate 62 shown in FIG. 1 continues to rotate after the fulcrum 62A of the first link 66 reaches the top dead center, and reaches the position indicated by the solid line in FIG. At this time, the bottom movable plate 64 connected by the first link 66 is also lowered until the fulcrum 62A of the first link 66 is lowered from the top dead center and reaches the position shown by the solid line in FIG. Will do.

  However, since the air cylinder 100 which is a moving urging member is urged in the direction in which the cylinder rod 104 is pulled out, the air cylinder 100 becomes an air cushion even when the bottom mold movable plate 64 is lowered, and the bottom mold fixed plate. 30 can be kept in the clamping position. Thus, the first and second blow cavity mold fixing plates 20 and 22 are clamped while the bottom mold fixing plate 64 is waiting at the mold clamping position. Thereby, as shown in FIG. 1, the pressure receiving members 20 </ b> A and 22 </ b> A engage with the pressure receiving member 30 </ b> A of the bottom mold fixing plate 30 after the first piston-crank mechanism 60 reaches the top dead center. .

  In addition, after the pressure receiving members 20A and 22A are engaged with the pressure receiving member 30A, the movement bias by the air cylinder 100 is not necessarily required. That is, the air cylinder 100 moves the bottom mold fixed plate 30 to the mold clamping position side with respect to the bottom mold movable plate 64 until at least the pressure receiving members 20A and 22A engage with the pressure receiving member 30A of the bottom mold fixed plate 30. It only has to be energized to move. In the present embodiment, the third air valve 144 shown in FIG. 3 is set to the third position D after the mold clamping is completed. Thus, the first chamber 106 and the second chamber 108 of the cylinder body 102 are opened to the atmosphere, and the cylinder rod 104 becomes free.

(Disengagement operation between the pressure receiving member and the pressure receiving member)
When the mold is opened, the engagement state between the pressure receiving members 20A and 22A and the pressure receiving member 30A shown in FIG. 1 must be released. At the time of mold opening, the motor 40 is rotated from the mold clamping state shown in FIG. 1, and the rotating plate 62 is rotated in the counterclockwise direction opposite to the arrow A direction in FIG. As a result, the second link 74 pulls the pulling member 72 upward from the state of FIG. 1 as the rotating plate 62 rotates. As a result, the third links 78A and 78B connected to the pulling member 72 are moved upward. When the third links 78A and 78B are raised, the first to fourth toggle arms 112A to 118B, which are in a straight line state, are displaced in directions having angles with respect to the shafts 120A, 120B, 122A, and 122B. The mold opening movement of the first and second blow cavity mold fixing plates 20 and 22 is started by the operations of the second piston-crank mechanism 70 and the toggle mechanisms 110A and 110B.

  On the other hand, when the rotating plate 62 rotates counterclockwise from the state of FIG. 1, the fulcrum 62A of the first link 66 moves toward the top dead center, and at this time, the bottom movable plate 64 is moved by the first link 66. Is pushed up.

  When the mold is opened, the third air valve 144 shown in FIG. 3 is controlled in the second position C, that is, the direction in which the cylinder rod 104 is retracted, that is, the bottom mold movable plate 64 is moved downward with respect to the bottom mold fixed plate 30. It is in a state of being energized.

  Thus, since the air cylinder 100 which is a moving urging member is urged in the direction in which the cylinder rod 104 is pulled, the air cylinder 100 becomes an air cushion even if the bottom mold movable plate 64 is lifted, and the bottom mold. The fixing plate 30 can be kept in the mold clamping position. Thus, the first and second blow cavity mold fixing plates 20 and 22 are opened while the bottom mold fixing plate 30 stands by at the mold clamping position. As a result, as shown in FIG. 1, the pressure receiving members 20A and 22A are engaged with the pressure receiving member 30A of the bottom fixing plate 30 after the first piston-crank mechanism 60 reaches the top dead center. Is released. When the engagement is released, the operation of the first piston-crank mechanism 60 causes the bottom mold fixed plate 30 connected to the bottom mold movable plate 64 in the air cylinder 100 to start descending, and the bottom mold is molded. Can be opened.

  It should be noted that after the engagement between the pressure receiving members 20A and 22A and the pressure receiving member 30A is released, the movement bias by the air cylinder 100 is not necessarily required. In other words, the air cylinder 100 only needs to be secured to the air cylinder 100 until the engagement between the pressure receiving members 20A and 22A and the pressure receiving member 30A is released. In the present embodiment, the third air valve 144 shown in FIG. 3 is set to the third position D after the mold opening is completed. Thus, the first chamber 106 and the second chamber 108 of the cylinder body 102 are opened to the atmosphere, and the cylinder rod 104 becomes free.

  Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention.

  For example, a term described at least once together with a different term having a broader meaning or the same meaning in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings.

  For example, the mechanism of FIG. 1 may be turned upside down and the bottom mold may be positioned above the first and second blow cavity molds. In this case, the above-mentioned “top dead center” becomes the “bottom dead center”.

  Further, the moving urging member is not limited to the air cylinder, and may be an elastic body such as a spring. However, an air cushion such as an air cylinder is used because it is necessary to appropriately set the spring constant in order to support the bottom mold fixing plate 30 and the bottom mold, and it is necessary to increase the motor capacity depending on the spring constant. Those are preferred.

It is a schematic front view which shows the mold clamping state of the blow molding machine which is one Embodiment of this invention. It is a schematic side view which shows the mold clamping mechanism of the base downward direction of FIG. It is an air circuit diagram of the air cylinder which is a moving urging member.

Explanation of symbols

10 base, 20 first blow cavity mold fixing plate, 20A pressure receiving member,
22 second blow cavity mold fixing plate, 22A pressure receiving member,
24A, 26A slider, 24B, 26B guide, 30 bottom mold fixing plate,
30A pressure receiving member, 40 motor, 42 speed reducer, 44 rotating shaft,
50 mold clamping mechanism, 60 first piston-crank mechanism, 62 rotating plate,
64 bottom movable plate, 66 first link, 68 guide rod,
70 second piston-crank mechanism, 72 traction member, 74 second link,
76 guide rod, 78A, 78B third link,
100 moving biasing member (air cylinder), 102 cylinder body,
104 cylinder rod, 106 first chamber, 108 second chamber,
110A, 110B toggle mechanism, 112A-118B toggle arm,
120A, 120B, 122A, 122B shaft, 124A, 124B connecting arm,
144 Third air valve

Claims (9)

In a blow molding machine that clamps the first and second blow cavity molds and the bottom mold to perform blow molding,
First and second blow cavity mold fixing plates to which the first and second blow cavity molds are fixed;
A bottom mold fixing plate to which the bottom mold is fixed;
A motor for generating a driving force for clamping the first and second blow cavity mold fixing plates and the bottom mold fixing plate;
A mold clamping mechanism for converting the driving force of the motor into a synchronous moving force between the first and second blow cavity fixing plates and the bottom mold fixing plate;
It is provided on the first and second blow cavity mold fixing plates, and engages with the bottom mold fixing plate when the first and second blow cavity molds are clamped so as to apply a blow pressure to the bottom mold. A pressure receiving member to receive,
A movement urging member provided in the mold clamping mechanism and configured to move and urge the bottom mold fixing plate toward the mold clamping position during the mold clamping;
A blow molding machine characterized by comprising: In claim 1,
The mold clamping mechanism includes a first piston-crank mechanism that drives the bottom mold fixing plate,
The first piston-crank mechanism is driven beyond the dead point at the time of clamping,
The bottom mold fixing plate is set to the mold clamping position when the first piston-crank mechanism reaches the dead point,
The blow molding machine, wherein the pressure receiving member is engaged with the bottom mold fixing plate after the first piston-crank mechanism reaches the dead point. In claim 2,
The first piston-crank mechanism includes:
A rotating plate driven based on the driving force of the motor;
A bottom movable plate guided by linear movement;
A first link having both ends rotatably connected to the first position shifted from the rotation center of the rotating plate and the bottom movable plate;
Including
The blow molding machine, wherein the movement urging member moves and urges the bottom mold fixed plate toward the mold clamping position with respect to the bottom mold movable plate. In claim 3,
The blow molding machine, wherein the moving biasing member is an air cylinder connected between the bottom mold movable plate and the bottom mold fixed plate. In claim 4,
The air cylinder is configured to move and urge the bottom mold fixed plate toward the mold clamping position with respect to the bottom mold movable plate until at least the pressure receiving member is engaged with the bottom mold fixed plate. Blow molding machine. In claim 5,
The air cylinder includes a cylinder body and a cylinder rod, and the cylinder body includes a first chamber and a second chamber partitioned by the cylinder rod,
The air cylinder has a first position for introducing air into the first chamber in a direction for pulling out the cylinder rod, a second position for introducing air into the second chamber in a direction for pulling in the cylinder rod, A blow molding machine, characterized in that the blow molding machine is connected to a valve that can be switched to a third position for opening the first chamber and the second chamber to the atmosphere. In any one of Claims 3 thru | or 6.
The mold clamping mechanism includes a second piston-crank mechanism for driving the first and second blow cavity fixing plates,
The blow molding machine characterized in that the first and second piston crank mechanisms share the rotating plate driven based on the driving force of the motor. In claim 7,
The second piston-crank mechanism includes:
The rotating plate;
A pulling member guided by linear movement;
A second link having both ends rotatably coupled to the second position shifted from the rotation center of the rotating plate and the traction member;
A blow molding machine comprising: In claim 8,
The mold clamping mechanism is
At least one toggle mechanism for driving the first and second blow cavity mold fixing plates;
A third link having both ends rotatably connected to the pulling member and the at least one toggle mechanism;
A blow molding machine comprising:

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