Blow molding machine

Abstract

To provide a hollow molding machine capable of properly recovering an upper burr while suppressing the scaling-up of the hollow molding machine or an increase in production cost.SOLUTION: In the hollow molding machine BM according to the present invention, the relative movement of the upper burr UB based on the inertial force generated during the conveyance of the molding product holder 10 is regulated by the non-slip portion 110 provided on the upper portion of the molding product holder 10, so that the upper burr UB can be prevented from falling off from the molding product holder 10 during the conveyance of the molding product holder 10 and the upper burr UB can be appropriately collected. At this time, since the non-slip portion 110 is provided on the upper portion of the molded article holder 10, it is possible to suppress an increase in size of the hollow molding machine BM and an increase in manufacturing cost.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a blow molding machine. [Background technology]

[0002] An example of a conventional blow molding machine is known, for example, from Patent Document 1 below.

[0003] In brief, when the casting nozzle of this blow molding machine is driven into the parison contained in the molding die, it is sandwiched between the inner peripheral edge of the die placed at the nozzle opening of the molding die and the outer peripheral edge of the cutting sleeve at the tip of the casting nozzle, so that the protruding part protruding from the molding die is sheared off and remains on the outer peripheral side of the cutting sleeve as an upper burr. Then, as the casting nozzle rises, this upper burr abuts against the stripper plate and falls off.

[0004] In the conventional blow molding machine, a burr collection duct is connected below the stripper plate, and upper burrs that come into contact with the stripper plate and fall off are discharged to the outside by air flowing through the duct and collected, thereby making it possible to recycle the upper burrs. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-053827 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the conventional blow molding machine, space is required to place the duct, which leads to an increase in the size of the blow molding machine, and the placement of the duct also leads to an increase in the manufacturing cost of the blow molding machine, so there is still room for improvement.

[0007] Therefore, the present invention was devised in consideration of the technical problems of the conventional blow molding machines, and aims to provide a blow molding machine that can properly recover upper flash while reducing the size and manufacturing costs of the blow molding machine. [Means for solving the problem]

[0008] In one aspect, a blow molding machine according to the present invention comprises a pair of mold clamping devices that clamp and open a pair of molds by moving the pair of molds closer to or apart from each other; an air blowing nozzle that is inserted into the pair of molds and blows air into a parison sandwiched between the pair of molds to form a hollow molded product; a molded product holder that faces vertically below the air blowing nozzle and grips and transports a plurality of molded products that are hung from the air blowing nozzle after molding; and an anti-slip portion that is provided above the molded product holder and that places upper burrs that are cut off by the air blowing nozzle during molding and that uses frictional force to restrict movement of the upper burrs as the molded product holder moves.

[0009] In this way, in the present invention, the anti-slip portion provided on the upper part of the molded product holder restricts the relative movement of the upper burr due to the inertial force generated during transport of the molded product holder, thereby enabling the upper burr to be properly collected. In this case, since the anti-slip portion is provided on the upper part of the molded product holder, it is possible to prevent the blow molding machine from becoming larger and the manufacturing costs from increasing.

[0010] In another aspect of the blow molding machine, the anti-slip portion is preferably formed by concave or convex portions arranged alternately and continuously on the upper surface of the molded product holder, and the movement of the upper burr is preferably restricted by the concave or convex portions.

[0011] If the non-slip portion is made of a resin material with a relatively high coefficient of friction, such as rubber, it may be damaged by the heat of the upper flash that forms during molding. In contrast, in the present invention, the non-slip portion is formed as a recess or protrusion directly machined into the upper surface of the molded product holder. In this way, by directly machining the molded product holder, the non-slip portion can be prevented from being damaged, which may occur if the non-slip portion is made of a different material, such as rubber.

[0012] Furthermore, if the non-slip portion is made of a different material, the non-slip portion must be attached to the molded product holder. In contrast, in the present invention, the non-slip portion is formed by directly processing the molded product holder, so the attachment work is not required and the non-slip portion can be installed relatively easily.

[0013] In yet another aspect of the blow molding machine, the recess or protrusion is formed by providing a linear groove extending in a direction perpendicular to the conveying direction of the molded product holder, and the upper burr placed on the anti-slip portion is preferably ejected by an extrusion mechanism that moves back and forth in a direction perpendicular to the conveying direction of the molded product holder during the stage of conveying the molded product by the molded product holder.

[0014] In this way, in the present invention, the recessed or protruding portion is formed by a linear groove extending in a direction perpendicular to the conveying direction of the molded product holder, which makes it possible to more effectively suppress the movement of the upper burr due to the inertial force generated during conveyance of the molded product holder.

[0015] Furthermore, since the grooves constituting the recessed or protruding portions are aligned with the direction in which the upper burrs are discharged, there is no risk that the recessed or protruding portions will interfere with the discharge mechanism's discharge of the upper burrs, and the upper burrs can be discharged smoothly.

[0016] In yet another aspect of the blow molding machine, the pair of mold clamping devices include a first link mechanism and a second link mechanism, which are a pair of link mechanisms arranged opposite each other in the horizontal direction and each rotates about a fulcrum at an intermediate portion thereof; a drive mechanism that rotates the first link mechanism and the second link mechanism by pushing and pulling one end of each of the first link mechanism and the second link mechanism; a first platen that is linked to the other end of the first link mechanism and supports the first mold of the pair of molds, the first molding mold and the second molding mold; a second platen that is arranged opposite the first platen in the horizontal direction and is linked to the other end of the second link mechanism and supports the second molding mold; and a mold clamping force generating mechanism that is configured between the drive mechanism and the first platen and is provided in a transmission path of a mold opening and closing force of the pair of molds, and generates a mold clamping force when the pair of molds are in contact and closed, and it is desirable that the drive mechanism be arranged so as to overlap the first platen or the second platen in the vertical direction.

[0017] As described above, in the present invention, the mold clamping unit has a pair of link mechanisms that are rotated by the drive mechanism. In a structure with many moving parts, such as a drive mechanism and a link mechanism, there is a risk that the intrusion of the upper burr may cause a malfunction of the mold clamping unit. Therefore, by restricting the movement of the upper burr with the anti-slip portion, it is possible to effectively prevent malfunction of a mold clamping unit with a relatively large number of moving parts, such as the mold clamping unit according to the present invention. [Effects of the Invention]

[0018] According to the present invention, by providing an anti-slip portion on the top of the molded product holder, it is possible to prevent the blow molding machine from becoming larger and manufacturing costs from increasing, while regulating the relative movement of the upper burrs due to the inertial force generated when the molded product holder is transported, thereby allowing the upper burrs to be properly recovered. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a plan view of a blow molding machine according to the present invention. [Figure 2]FIG. 2 is a front view of the blow molding machine shown in FIG. [Figure 3] FIG. 3 is a front view of the mold clamping device shown in FIG. [Figure 4] 1 is an enlarged perspective view of a main part of a mold clamping device and a molded product holder according to the present invention, showing a state in which the mold clamping device is in a mold-open state. FIG. [Figure 5] FIG. 2 is an enlarged perspective view of a main part of the blow molding machine shown in FIG. 1, showing a state before a molded product is conveyed. [Figure 6] 2 is an enlarged perspective view of a main part of the blow molding machine shown in FIG. 1, showing the state after conveyance of a molded product. FIG. [Figure 7] These are cross-sectional views of a molded product holder showing the process of cutting off an upper burr from a molded product, where (a) shows the state before the molded product is removed from the mold, (b) shows the state in which the molded product is held by the molded product holder, and (c) shows the state in which the upper burr has fallen off the driving nozzle. [Figure 8] 3 is a cross-sectional view taken along line AA in FIG. 2, showing a state before the upper burr is removed. FIG. [Figure 9] 3 is a cross-sectional view taken along line AA in FIG. 2, showing a state after the upper burr has been removed. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of a blow molding machine according to the present invention will be described in detail with reference to the drawings. In the following embodiment, the blow molding machine according to the present invention will be described as an example in which the blow molding machine is applied to a blow molding machine.

[0021] (Configuration of blow molding machine) FIG. 1 shows a plan view of the blow molding machine BM according to this embodiment. FIG. 2 shows a front view of the blow molding machine BM shown in FIG. 1. FIG. 3 shows a front view of the mold clamping device 4. FIG. 4 shows an enlarged perspective view of the mold clamping device 4 and the molded product holder 10. FIG. 5 shows an enlarged perspective view of the blow molding machine BM shown in FIG. 1, illustrating the state before the molded product W is transferred. FIG. 6 shows an enlarged perspective view of the blow molding machine BM shown in FIG. 1, illustrating the state after the molded product W is transferred. FIG. 7 is a cross-sectional view of the molded product holder 10 illustrating the process of cutting the upper flash UB from the molded product W. (a) shows the state before the molded product W is removed from the molding die 3, (b) shows the state in which the molded product W is held by the molded product holder 10, and (c) shows the state after the upper flash UB has fallen off the injection nozzle 71. FIG. 8 is a cross-sectional view taken along line AA in FIG. 2, illustrating the state before the upper flash UB is removed. Figure 9 is a cross-sectional view taken along line AA in Figure 2, showing the state after the upper flash UB has been removed. In the following explanation, in Figure 1, the direction in which the molding die 3 is transferred by the die transfer device 6 is defined as the "X direction," the direction in which the molding die 3 is opened and closed by the clamping device 4 is defined as the "Y direction," and the direction in which the driving nozzle 71 is raised and lowered by the driving device 7 is defined as the "Z direction."

[0022] As shown in Figures 1 and 2, the blow molding machine BM of this embodiment includes an extruder 1 that melts and extrudes a synthetic resin, a die head 2 that is provided at the tip of the extruder 1 and that hangs down a cylindrical parison P, a molding die 3 that is composed of a pair of dies (a first molding die 31 and a second molding die 32 described below) that mold the parison P into a hollow molded product W, a mold clamping device 4 that closes and opens the molding die 3, a parison cutting device (not shown) that cuts the hanging parison P to a predetermined length, a mold transfer device 6 that moves the molding die 3 back and forth in the X direction of Figure 1, a driving device 7 that supplies compressed air to the inside of the parison P contained in the molding die 3, a removal device 8 that removes the molded product W, and a burr collection device 9 that collects upper burrs UB formed during the molding of the molded product W.

[0023] The blow molding machine BM is configured in the X direction of Figure 1 with a parison clamping stage S1 that clamps the parison P hanging down from the die head 2 between the molding dies 3, an air blowing stage S2 that uses an injector 7 to blow compressed air into the parison P clamped between the molding dies 3 in the parison clamping stage S1 to form (shape) a hollow molded product W, and a molded product removal stage S3 that removes the molded product W molded in the air blowing stage S2 to the outside.

[0024] The extruder 1 includes a hopper 1a into which the resin material is introduced, and a screw (not shown) that transfers, kneads, melts, and discharges the resin material inside the extruder 1. The die head 2 has eight heads and is composed of a die and a core. That is, the resin material molten in the extruder 1 is supplied to the die head 2, whereby a cylindrical parison P is formed.

[0025] 4, the molding die 3 is composed of a pair of dies, a first molding die 31 and a second molding die 32, and has a plurality of cavities 30 (eight in this embodiment) formed therein for receiving cylindrical parisons P and for molding molded products W. The cavity 30 has an opening 300 at its upper end that opens to the outside, and a pair of nozzles 301, 302 are provided at the opening edge of the opening 300 via a tapered surface that expands in diameter upward and is used to shear (cut) the parison P inserted from the die head 2.

[0026] Furthermore, the molding die 3 can be moved back and forth horizontally alternately between a position directly below the die head 2 (see FIG. 5) and a position directly below a driving nozzle 71 (described later) of the driving device 7 (see FIG. 6) via a mold transfer device 6 having an electric motor (not shown) for transferring the mold. This allows for alternating switching between a parison clamping stage S1 that clamps the parison P extruded from the die head 2 between the molding dies 3 (cavity 30) and an air blowing stage S2 that blows compressed air via the driving device 7 into the parison P clamped between the molding dies 3 (cavity 30).

[0027] 3, the mold clamping unit 4 is driven to open / close and clamp the molding dies 3 (first molding die 31 and second molding die 32) in the Y direction of FIG. 1, and moves the first molding die 31 and the second molding die 32 in a synchronized manner in directions toward or away from each other via a first platen 451 and a second platen 452 to which the first molding die 31 and the second molding die 32 are attached. Specifically, the mold clamping unit 4 is provided with a first link mechanism L1 and a second link mechanism L2, which are a pair of link mechanisms that are arranged opposite each other in the horizontal direction and are rotatable about their intermediate portions, and a drive mechanism DM that rotates the first link mechanism L1 and the second link mechanism L2 by pushing and pulling one end of the first link mechanism L1 and the second link mechanism L2, respectively.

[0028] The first link mechanism L1 and the second link mechanism L2 are composed of a pair of left and right first main links 411 and second main links 412 that extend in the vertical direction and whose longitudinal middle portions 411a and 412a are rotatably supported on a support frame 40 that serves as a base via pins 401, a first upper link 421 and a second upper link 422 that are connected to one longitudinal end portion (upper end portion 411b and 412b) of the first main link 411 and the second main link 412, respectively, via pins 402, and a first lower link 431 and a second lower link 432 that are connected to the other longitudinal end portion (lower end portion 411c and 412c) of the first main link 411 and the second main link 412, respectively, via pins 403.

[0029] The first main link 411 and the second main link 412 are shaped like plates that are roughly obtuse triangles, and have pins 401 inserted through intermediate portions 411a, 412a in the longitudinal direction near the apex angles, respectively, and are supported by the support frame 40 via the pins 401. In this way, the first main link 411 and the second main link 412 are rotatable so as to tilt about the pin 401. More specifically, the first main link 411 and the second main link 412 rotate about the pin 401 as a fulcrum when the lower end portions 411c, 412c of the first main link 411 and the second main link 412 are pushed and pulled by the first lower link 431 and the second lower link 432. As a result, the first upper link 421 and the second upper link 422 are pushed and pulled by the upper ends 411b, 412b of the first main link 411 and the second main link 412, and the molding die 3 is opened and closed via the first platen 451 and the second platen 452.

[0030] The first upper link 421 and the second upper link 422 are disposed in pairs facing each other on both sides in the thickness direction of the upper end portions 411b, 412b of the first main link 411 and the second main link 412. That is, the first upper link 421 and the second upper link 422 have first longitudinal end portions 421a, 422a that sandwich the upper end portions 411b, 412b of the first main link 411 and the second main link 412, and are connected to the upper end portions 411b, 412b of the first main link 411 and the second main link 412 via pins 402 that pass through the first end portions 421a, 422a. In addition, the first upper link 421 and the second upper link 422 have their second longitudinal ends 421b, 422b connected to a first platen 451 and a second platen 452, respectively, via pins 404, for attaching the molding die 3 (first molding die 31 and second molding die 32).

[0031] The first lower link 431 and the second lower link 432 are disposed in pairs facing each other on both sides in the thickness direction of lower end portions 411c, 412c of the first main link 411 and the second main link 412. That is, first longitudinal end portions 431a, 432a of the first lower link 431 and the second lower link 432 sandwich the lower end portions 411c, 412c of the first main link 411 and the second main link 412, and are connected to the lower end portions 411c, 412c of the first main link 411 and the second main link 412 via pins 403 that penetrate the lower end portions 411c, 412c. Furthermore, second longitudinal end portions 431b, 432b of the first lower link 431 and the second lower link 432 are connected to the crank member 44 via pins 405 so as to be able to be bent and stretched.

[0032] The drive mechanism DM is made up of an electric motor M, a drive shaft 400 that rotates integrally with the output shaft of the electric motor M, and a crank member 44 that is inserted into a shaft insertion hole 440 that penetrates the center and is connected to the drive shaft 400 so as to be rotatable integrally. The crank member 44 is disposed so as to overlap vertically below the first platen 451 and the second platen 452, and is provided so as to be rotatable by the electric motor M (see FIG. 2) via the drive shaft 400.

[0033] The first platen 451 and the second platen 452 are attached via bolts (not shown) to the first molding die 31 and the second molding die 32, which are formed by splitting (dividing) the molding die 3 in the Y direction in Fig. 1, and move integrally with the first molding die 31 and the second molding die 32. The first platen 451 and the second platen 452 are placed on a movable table 46, such as a well-known LM guide, which is installed along the Y direction in Fig. 1, which is the opening and closing direction of the molding die 3, and are slidable horizontally (in the Y direction in Fig. 1) along the movable table 46.

[0034] The first platen 451 and the second platen 452 have a first extension portion 451b and a second extension portion 452b that extend downward from the movable base 46, and are linked via the first extension portion 451b and the second extension portion 452b to a synchronization mechanism TM that synchronizes the opening and closing movements of the first forming die 31 and the second forming die 32. The synchronization mechanism TM is arranged opposite to each other in the horizontal direction and is composed of a first rack bar 481 and a second rack bar 482 that extend along the movable base 46 and are linked to the first extension portion 451b and the second extension portion 452b, respectively, and a pinion shaft 480 that is interposed between the first rack bar 481 and the second rack bar 482 and has pinion teeth 480a on its outer periphery that mesh with first rack teeth 481a and second rack teeth 482a formed on the opposing surfaces of the first rack bar 481 and the second rack bar 482, respectively. Here, the pinion shaft 480 is provided to extend generally vertically from a position vertically below the first rack bar 481 and the second rack bar 482 so as to be generally perpendicular to the first rack bar 481 and the second rack bar 482. As a result, when the pinion shaft 480 rotates, the first platen 451 and the second platen 452 can move in unison along the movable base 46 in directions approaching or separating from each other.

[0035] Furthermore, a first clevis 471 and a second clevis 472 that connect to the first upper link 421 and the second upper link 422 are connected via bolts (not shown) to the outer sides of the first platen 451 and the second platen 452 that face the first upper link 421 and the second upper link 422, respectively. The first clevis 471 is connected to the first upper link 421 via a clamping force generating mechanism 5 (described later) that generates a clamping force when the molding die 3 (first molding die 31 and second molding die 32) is closed. On the other hand, the second clevis 472 has a link connection portion 472a formed in a generally plate shape at its outer end, and the link connection portion 472a is sandwiched between second ends 422b, 422b of the pair of second upper links 422, 422 and connected to the second upper links 422, 422 via a pin 404.

[0036] Furthermore, the mold clamping unit 4 has a mold clamping force generating mechanism 5, which is located in a transmission path of the mold opening / closing force of the molding dies 3 (first molding die 31 and second molding die 32) between the drive mechanism DM and the first platen 451, and generates a mold clamping force when the first molding die 31 and the second molding die 32 are in contact with each other and closed. The mold clamping force generating mechanism 5 transmits the biasing force of a biasing member (not shown) incorporated inside the first clevis 471 from the first clevis 471 via the first platen 451 to the first molding die 31. As a result, the first clevis 471 is biased in the mold closing direction, and a mold clamping force is applied from the first clevis 471 via the first platen 451 to the first molding die 31.

[0037] 2 and 5 to 7, the driving device 7 includes a plurality of driving nozzles 71 (the number of which corresponds to each of the cavities 30) that serve as air blowing nozzles that blow compressed air into the interior of the parison P contained in each of the cavities 30 of the molding die 3, and a nozzle drive device 72 that is fixed to the housing 70 and moves each driving nozzle 71 up and down. Each driving nozzle 71 has a nozzle body 711 that penetrates the housing 70 in the vertical direction and is connected to the nozzle drive device 72, and a nozzle insertion part 712 that is provided at the tip of the nozzle body 711 and is inserted into the interior of each of the cavities 30 through each nozzle insertion hole 701 that penetrates the housing 70. The driving nozzle 71 also has a cutting sleeve 713 between the nozzle body 711 and the nozzle insertion part 712, which cooperates with the nozzles 301, 302 provided at the opening 300 of each cavity 30 to shear off the upper burr UB between the nozzles 301, 302. The nozzle driving device 72 has an electric motor 73 (see FIG. 1) attached to the top of the housing 70, and drives and controls the driving nozzle 71 in the vertical direction (Z direction in FIG. 1) via the electric motor 73.

[0038] Here, compressed air is blown into the parison P in the molding die 3 via the driving device 7 to form a molded product W, which is then gripped by a molded product holder 10 and transported from the air blowing stage S2 to the molded product removal stage S3 along the X direction in FIG. 1. As shown in FIGS. 4 to 6, the molded product holder 10 is composed of a first holder 101 and a second holder 102, each of which is split in half in the mold opening / closing direction (the Y direction in FIG. 1). The first holder 101 is fixed to a side surface of the first platen 451 and moves open and closed integrally with the first platen 451, while the second holder 102 is fixed to a side surface of the second platen 452 and moves open and closed integrally with the second platen 452. In this way, the molded product holder 10 can be opened and closed in synchronization with the opening and closing of the molding die 3 (the first molding die 31 and the second molding die 32) in the mold opening / closing direction (the Y direction in FIG. 1).

[0039] Specifically, the first holder 101 and the second holder 102 are provided with a first gripping portion 103 and a second gripping portion 104 that face each other in the opening / closing direction (the Y direction in FIG. 1) and cooperate with each other to grip the molded product W, and a first mounting portion 105 and a second mounting portion 106 for fixing the first gripping portion 103 and the second gripping portion 104 to the first molding die 31 and the second molding die 32. The first mounting portion 105 and the second mounting portion 106 are fixed to the first platen 451 and the second platen 452, respectively, via a plurality of bolts (not shown).

[0040] The first gripping unit 103 includes a pair of plate-shaped gripping members, namely, a first upper gripping member 103a and a first lower support member 103b, which are opposed to each other in the vertical direction, and a first connecting member 103c that connects the first upper gripping member 103a and the first lower support member 103b. Similarly, the second gripping unit 104 includes a pair of plate-shaped gripping members, namely, a second upper gripping member 104a and a second lower support member 104b, which are opposed to each other in the vertical direction (Z direction in FIG. 1), and a second connecting member 104c that connects the second upper gripping member 104a and the second lower support member 104b.

[0041] The first upper gripping member 103a and the second upper gripping member 104a are provided with a first mouth gripping portion 107a and a second mouth gripping portion 107b on their inner sides facing each other in the opening / closing direction (Y direction in FIG. 1) of the molded product holder 10 (first holder 101 and second holder 102), which cooperate to grip the mouth W1 formed in a constricted shape at the upper end of the molded product W. The first mouth gripping portion 107a and the second mouth gripping portion 107b are formed by cutting out arc-shaped portions of the inner sides of the first upper gripping member 103a and the second upper gripping member 104a, and each surrounds a half periphery of the mouth W1 of the molded product W, thereby being able to grip the mouth W1 of the molded product W.

[0042] The first lower support member 103b and the second lower support member 104b are provided with a first body support portion 108a and a second body support portion 108b, which are capable of supporting the lower end portion (bottom portion) of the body portion W2 of the molded product W in cooperation with each other, on inner portions facing each other in the opening / closing direction (Y direction in FIG. 1) of the molded product holder 10 (first holder 101 and second holder 102). The first body support portion 108a and the second body support portion 108b are formed by recessing the upper inner sides of the first lower support member 103b and the second lower support member 104b in a concave arc shape, and each supports the bottom portion of the semi-circumferential side of the body portion W2 of the molded product W, thereby enabling support of the body portion W2 of the molded product W from below.

[0043] With this configuration, after the molded product W is molded in the air blowing stage S2, the molded product holder 10 has the first holder 101 and the second holder 102 open as the molded product 3 (first mold 31 and second mold 32) moves back to the parison clamping stage S1, and the molded product holder 10 faces the molded product W that has been released from the first mold 31 and the second mold 32 and is hanging from the casting nozzle 71, and closes as the molded product 3 closes in the parison clamping stage S1, thereby clamping and holding the mouth portion W1 and body portion W2 of the molded product W hanging from the casting nozzle 71.

[0044] In addition, on the upper part of the first upper gripping member 103a and the second upper gripping member 104a, as shown in Figures 4 to 7, for example, there is provided an anti-slip portion 110 that receives the upper burr UB that is sheared (cut) by the cutting sleeve 713 of the injection nozzle 71 inserted into the inside of the parison P contained in the molding die 3 (cavity 30) at the air blowing stage S2 and the nozzles 301, 302 of the cavity 30, and that uses frictional force to regulate the movement of the upper burr UB as the molded product holder 10 is transported and moved.

[0045] The anti-slip portion 110 is formed integrally with the upper surface of the molded product holder 10 by directly processing the upper surface of the molded product holder 10, and is formed of a plurality of recesses 110a and protrusions 110b that are continuously and alternately provided on the upper surface of the molded product holder 10 in the X direction of Fig. 1. Each recess 110a is formed by a linear groove whose cross section extending in a direction (Y direction in Fig. 1) perpendicular to the conveyance direction of the molded product holder 10 (X direction in Fig. 1) is formed in an arc-shaped concave shape, and each protrusion 110b formed between each recess 110a is formed by a linear ridge extending in a direction (Y direction in Fig. 1) perpendicular to the conveyance direction of the molded product holder 10 (X direction in Fig. 1). In other words, the anti-slip portion 110 causes a portion of the upper burr UB to fall into the recess 110a, so that when the molded product holder 10 is transported, the upper burr UB gets caught on the protrusions 110b protruding from both ends of the recess 110a, thereby restricting the movement of the upper burr UB in the transport direction of the molded product holder 10 (the X direction in Figure 1).

[0046] The relationship between the recesses 110a and the protrusions 110b may be reversed in the anti-slip portion 110. That is, the anti-slip portion 110 may be provided with the protrusions 110b on the upper surfaces of the first upper gripping member 103a and the second upper gripping member 104a, and the upper burr UB may be dropped into the recesses 110a formed between the protrusions 110b and hooked onto the protrusions 110b, thereby preventing the upper burr UB from falling off the upper surfaces of the first upper gripping member 103a and the second upper gripping member 104a when the molded product holder 10 is transported.

[0047] As another aspect of the non-slip portion 110, although not specifically shown in the drawings, the recesses 110a and the protrusions 110b may be formed in a non-linear shape, for example, by knurling or dimple processing on the upper surfaces of the first upper gripping member 103a and the second upper gripping member 104a. In other words, it is sufficient that at least the protrusions 110b of the non-slip portion 110 are formed so as to intersect with the conveying direction of the molded product holder 10 (the X direction in FIG. 1), and the specific shapes of the recesses 110a and the protrusions 110b can be changed as desired depending on the specifications of the blow molding machine BM, etc.

[0048] Furthermore, the anti-slip portion 110 of this embodiment may be formed by directly processing the upper surface of the molded product holder 10 (first upper gripping member 103a and second upper gripping member 104a) as in this embodiment, or may be formed by joining a generally flat, plate-like or strip-like anti-slip member made of a material different from the first upper gripping member 103a and second upper gripping member 104a and having a higher friction coefficient than the metal material that forms the upper surface of the molded product holder 10 (first upper gripping member 103a and second upper gripping member 104a) via any fixing means such as adhesive or fastening. In other words, as long as the anti-slip portion 110 can provide a regulating action capable of resisting the inertial force generated when the molded product holder 10 is transported against the upper burr UB that has fallen onto the molded product holder 10, it may be formed separately (as a separate component) from the first upper gripping member 103a and the second upper gripping member 104a, and may also be configured to be generally flat without having the recessed portion 110a and the protruding portion 110b.

[0049] 1, the removal device 8 is provided adjacent to the driving device 7 and is arranged so as to face the molded product holder 10 in the molded product removal stage S3. A well-known belt conveyor 80 serving as a transport means is arranged below the removal device 8. That is, the removal device 8 removes the molded product W from the molded product holder 10 in the molded product removal stage S3 and transports the removed molded product W to the outside via the belt conveyor 80.

[0050] As shown in Figures 1, 8 and 9, the burr collection device 9 is arranged opposite the molded product holder 10 on the molded product removal stage S3, and is equipped with an extrusion mechanism 91 that extends toward the molded product holder 10 to push out the upper burr UB placed on the anti-slip portion 110 of the molded product holder 10, and a burr collection section 92 that is arranged adjacent to the extrusion mechanism 91 and drops and collects the upper burr UB extruded by the extrusion mechanism 91.

[0051] The push-out mechanism 91 is driven by an actuator such as an air cylinder AC, and has a pair of punching arms 911 that move back and forth along the Y direction in Fig. 1. The punching arms 911 have wide punching portions 912 at their tips that extend in the X direction in Fig. 1, and the punching portions 912 move forward and backward in parallel along the non-slip portions 110, thereby pushing out the upper burrs UB that remain on the non-slip portions 110 towards the burr collection portion 92 via the punching portions 912.

[0052] The burr collection section 92 is formed in the shape of a rectangular cylinder with a bottom that opens at the top via an opening 920 and is closed at the bottom by a bottom wall (not shown), and is configured so that the opening 920 overlaps with the punching section 912 that has advanced in the vertical direction (Z direction in FIG. 1). That is, the burr collection section 92 collects upper burrs UB that have been pushed off the non-slip section 110 of the molded product holder 10 that faces the opening 920 by the punching section 912 of the extrusion mechanism 91. It is desirable that the upper burrs UB collected by the burr collection section 92 be automatically discharged to the outside via a burr discharge section 93, such as a chute, that extends to the outside of the burr collection section 92.

[0053] (Explanation of the operation of the blow molding machine) In the blow molding machine BM, the parison P, which is extruded from the die head 2 and hangs down, is placed in the open molding die 3 (see FIG. 5), and while still clamped by the clamping device 4, is transferred by the mold transfer device 6 to a position directly below the driving device 7 (see FIG. 6). As shown in FIG. 7(a), the driving device 7 inserts a driving nozzle 71 (nozzle insertion portion 712) through the opening 300 of the molding die 3 and blows compressed air into the parison P in the molding die 3 (cavity 30), thereby pressing the expanded parison P against the cavity 30 formed inside the molding die 3 to form a molded product W. Thereafter, as shown in FIG. 7(b), the molding die 3 is moved in the open state to its original position directly below the die head 2, and the molded product W suspended by the driving nozzle 71 is held by the molded product holder 10. The molded product W is then transported to the molded product removal stage S3 (see FIG. 2) via the molded product holder 10, handed over to the removal device 8 at the molded product removal stage S3, and transported to the outside via the removal device 8.

[0054] Here, after the molding of the molded product W, the upper burr UB sheared off by the cutting sleeve 713 is held in a pressed-in state on the outer periphery of the cutting sleeve 713 and rises along with the driving nozzle 71. Then, as the cutting sleeve 713 of the driving nozzle 71 rises to the nozzle insertion hole 701 that opens into the housing 70 of the driving device 7, the upper burr UB adhering to the outer periphery of the cutting sleeve 713 comes into contact with the stripper plates 702 provided on each hole edge of the nozzle insertion hole 701 and is removed from the driving nozzle 71, as shown in Figure 7(c), and this removed upper burr UB falls onto the anti-slip portion 110 of the molded product holder 10 that faces the driving nozzle 71 in the vertical direction. As a result, even if an inertial force acts on the upper burr UB when the molded product holder 10 is transported, the relative movement of the upper burr UB in the anti-slip portion 110 is restricted, the upper burr UB is kept on the anti-slip portion 110, and the upper burr UB is prevented from falling off from the molded product holder 10.

[0055] Thereafter, when the molded product holder 10 moves to the molded product removal stage S3, the push-out mechanism 91 (punching unit 912) of the burr collection device 9 faces the molded product holder 10 in the Y direction of FIG. 1, as shown in FIG. 8. Then, from this state, as shown in FIG. 9, the punching arm 911 of the push-out mechanism 91 driven by the air cylinder AC advances, causing the punching unit 912 to come into contact with the side of the upper burr UB resting on the anti-slip portion 110 of the molded product holder 10, and the upper burr UB is pushed down toward the burr collection unit 92. Then, the upper burr UB falls into the burr collection unit 92, where it is collected.

[0056] (Effects of this embodiment) As described above, in the blow molding machine BM according to this embodiment, the anti-slip portion 110 provided on the upper part of the molded product holder 10 can restrict the relative movement of the upper flash UB due to the inertial force generated when the molded product holder 10 is transported. Moreover, because the anti-slip portion 110 is provided on the upper part of the molded product holder 10, it is possible to prevent the blow molding machine BM from becoming larger and its manufacturing costs from increasing. This makes it possible to restrict the relative movement of the upper flash UB due to the inertial force generated when the molded product holder 10 is transported and to prevent the upper flash UB from falling off the molded product holder 10, while also achieving a reduction in the size and manufacturing costs of the blow molding machine BM.

[0057] Furthermore, if the non-slip portion 110 is formed of a resin material, such as a rubber material, which has a higher coefficient of friction than a metal material, the non-slip portion 110 may be damaged by the heat of the upper flash UB that is generated during the molding of the molded product W. In contrast, in this embodiment, the non-slip portion 110 is formed by recesses 110a or protrusions 110b that are machined directly on the upper surface of the molded product holder 10 (the first upper gripping member 103a and the second upper gripping member 104a). In this way, since the non-slip portion 110 is formed by directly machining the molded product holder 10 (the first upper gripping member 103a and the second upper gripping member 104a), damage to the non-slip portion 110 that may occur if the non-slip portion 110 is formed of a different material, such as a rubber material, can be prevented.

[0058] Furthermore, if the non-slip portion 110 is formed from the different material, an attachment operation is required to attach the non-slip portion 110 to the molded product holder 10 (the first upper gripping member 103a and the second upper gripping member 104a). In contrast, in this embodiment, the non-slip portion 110 is formed by directly processing the molded product holder 10, so the attachment operation is not required and the non-slip portion 110 can be installed relatively easily.

[0059] In this embodiment, the recessed portion 110a or the protruding portion 110b is formed by a linear groove extending in a direction (Y direction in FIG. 1) perpendicular to the conveying direction (X direction in FIG. 1) of the molded product holder 10. Therefore, the anti-slip portion 110 can more effectively suppress the movement of the upper flash UB due to the inertial force generated during the conveyance of the molded product holder 10.

[0060] Furthermore, in this embodiment, the recessed portion 110a or the protruding portion 110b constituting the non-slip portion 110 coincides with the direction in which the upper burr UB is discharged by the extrusion mechanism 91 of the burr collection device 9. This prevents the recessed portion 110a or the protruding portion 110b from interfering with the discharge (extrusion) of the upper burr UB by the extrusion mechanism 91, and allows the upper burr UB to be discharged smoothly.

[0061] Furthermore, in this embodiment, the mold clamping unit 4 has a first link mechanism L1 and a second link mechanism L2, which are a pair of link mechanisms rotated by the drive mechanism DM. In this way, in a mold clamping unit 4 having a structure with many moving parts such as the drive mechanism DM, the first link mechanism L1, and the second link mechanism L2, there is a risk that the intrusion of the upper burr UB will cause a malfunction of the mold clamping unit 4. Therefore, by restricting the movement of the upper burr UB with the anti-slip portion 110, it is possible to effectively prevent malfunction of the mold clamping unit 4 having a relatively large number of moving parts, such as the mold clamping unit 4 according to this embodiment.

[0062] The present invention is not limited to the configurations and aspects exemplified in the above-described embodiments, etc., and can be freely modified depending on the specifications, cost, etc. of the blow molding machine BM to which it is applied, as long as the configuration can achieve the effects of the present invention as described above. [Explanation of symbols]

[0063] 1...Extruder 2...Die head 3...Mold 31...First molding die 32...Second molding die 4…Mold clamping device 411...First main link (first link mechanism) 412...Second main link (second link mechanism) 421...First upper link (first link mechanism) 422...Second upper link (second link mechanism) 431...First lower link (first link mechanism) 432...Second lower link (second link mechanism) 451...1st platen 452...Second platen 46…Movable platform 5...Mold clamping force generating mechanism 7...Driving device 71... Driving nozzle (air blowing nozzle) 9... Burr collection device 91...Extrusion mechanism (ejection mechanism) 10...Molded product holder 110...Anti-slip part 110a...recess 110b...Convex part L1...First link mechanism L2: Second link mechanism DM...Drive mechanism BM…Blow molding machine P...Parison UB…upper burr

Claims

1. a pair of mold clamping devices that clamp and open the molds by moving the pair of molds closer to or apart from each other; an air blowing nozzle inserted into the pair of molds to blow air into the parison sandwiched between the pair of molds to form a hollow molded product; a molded product holder that faces vertically below the air blowing nozzle and grips and transports the molded products suspended from the air blowing nozzle after molding; an anti-slip portion provided on an upper portion of the molded product holder, on which an upper burr cut off by the air blowing nozzle during molding is placed, and which uses frictional force to restrict movement of the upper burr accompanying movement of the molded product holder; A blow molding machine comprising:

2. The blow molding machine according to claim 1, The anti-slip portion is formed by a recess or a protrusion that is continuously and alternately provided on the upper surface of the molded product holder, and the recess or the protrusion restricts movement of the upper burr. A blow molding machine characterized by:

3. The blow molding machine according to claim 2, the recessed portion or the protruding portion is formed by providing a linear groove extending in a direction perpendicular to the conveying direction of the molded product holder, The upper burr placed on the anti-slip portion is discharged by an extrusion mechanism that moves back and forth in a direction perpendicular to the conveying direction of the molded product holder during the conveying step of the molded product by the molded product holder. A blow molding machine characterized by:

4. The blow molding machine according to any one of claims 1 to 3, The pair of mold clamping devices a first link mechanism and a second link mechanism, which are a pair of link mechanisms that are arranged opposite to each other in a horizontal direction and each rotates around a middle portion of the link mechanism; a drive mechanism that rotates the first link mechanism and the second link mechanism by pushing and pulling one end side of each of the first link mechanism and the second link mechanism; a first platen connected to the other end of the first link mechanism and configured to support the first molding die of the pair of dies, that is, the first molding die and the second molding die; a second platen that is provided opposite to the first platen in the horizontal direction, that is linked to the other end of the second link mechanism, and that supports the second molding die; a mold clamping force generating mechanism that is provided in a transmission path of a mold opening / closing force of the pair of molds and is configured between the drive mechanism and the first platen, and that generates a mold clamping force when the pair of molds are in contact with each other and closed; Equipped with the drive mechanism is disposed so as to overlap the first platen or the second platen in a vertical direction; A blow molding machine characterized by:

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