Blow molding device

Abstract

To provide a blow molding device that can avoid the use of a large facility (blow molding device) in an opening / closing direction of a mold.SOLUTION: In a blow molding device 1, a drive mechanism DM is placed to overlap with a first platen 451 or a second platen 452 in the vertical direction. Thus, enlarging the size of the blow molding device 1 in the horizontal direction (opening / closing direction of a molding mold 3) can be suppressed as compared to a conventional blow molding device where a drive mechanism DM is disposed in series in the horizontal direction to the first platen 451.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] As an example of a conventional blow molding machine, for example, the one described in Patent Document 1 below is known.

[0003] In brief, this blow molding machine has a crank-shaped clamping drive mechanism provided on the side of one of a pair of horizontally divided dies in the opening and closing direction, and clamps the dies by extending a first link on the die side and a second link on the opposite die side, which are linked to the clamping drive mechanism, from a bent state to the horizontal direction.The blow molding machine also has a clamping force generating mechanism on the side of the second link, and this clamping force generating mechanism generates a clamping force by the reaction force of a disc spring that is compressed when the dies come into contact with each other. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4384879 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional blow molding machine, the mold clamping drive mechanism is disposed in series with the mold clamping drive mechanism in the mold opening / closing direction, which means that the blow molding machine becomes larger in size in the mold opening / closing direction, and there is still room for improvement.

[0006] Therefore, the present invention has been devised in consideration of the technical problems of the conventional blow molding machines, and aims to provide a blow molding machine that can suppress the increase in size of the equipment (blow molding machine) in the opening and closing direction of the mold. [Means for solving the problem]

[0007] In one aspect, a blow molding machine according to the present invention includes 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 of which rotates about a fulcrum at an intermediate portion; a drive mechanism which rotates the first link mechanism and the second link mechanism by pushing and pulling one end side of the first link mechanism and the second link mechanism, respectively; a first platen which is linked to the other end side of the first link mechanism and supports the first molding die of a pair of dies, a first molding die and a second molding die; a second platen which is arranged opposite to the first platen in the horizontal direction and linked to the other end side of the second link mechanism and supports the second molding die; and a clamping force generating mechanism which is provided in a transmission path of a mold opening and closing force of the pair of dies between the drive mechanism and the first platen and generates a mold clamping force when the pair of dies are in contact and closed, and the drive mechanism is arranged so as to overlap the first platen or the second platen in the vertical direction.

[0008] In this way, according to the present invention, the drive mechanism is disposed so as to overlap the first platen or the second platen in the vertical direction, which makes it possible to prevent the blow molding machine from becoming large in the horizontal direction, compared to conventional blow molding machines in which the drive mechanism is disposed in series in the horizontal direction with respect to the platens.

[0009] In addition, as another aspect of the blow molding machine, it is desirable that the blow molding machine has a blow pin that is inserted into the upper part of the pair of molds to be used for blow molding, and that the first platen and the second platen are each placed on a movable table that is movable in a horizontal direction.

[0010] In this way, in the present invention, the lower parts of the first platen and the second platen are supported on a movable table that can move horizontally. Therefore, the driving force of the blow pin acting vertically downward on the mold can be supported by the movable table. This prevents the driving force of the blow pin from acting on each link mechanism, making it possible to suppress uneven wear of the parts in each link mechanism.

[0011] In still another aspect of the blow molding machine, it is preferable that the first platen and the second platen are linked with a synchronization mechanism that synchronizes the opening and closing movements of the pair of molds.

[0012] In this way, in the present invention, the first platen and the second platen are configured to be able to move an equal distance on the movable table by interlocking with a synchronization mechanism that synchronizes the opening and closing movements of the pair of molds. This makes it possible to always keep the mold clamping position constant and to maintain a constant parting line. This makes it possible to suppress variations in thickness and cooling of the molded product that may occur due to deviations in the mold clamping position.

[0013] In still another aspect of the blow molding machine, it is desirable that the mold clamping force generating mechanism be provided adjacent to the first platen between the first platen and the first link mechanism.

[0014] In this way, in the present invention, the clamping force generating mechanism is provided adjacent to the first platen between the first platen and the first link mechanism, which makes it possible to directly and efficiently transmit the clamping force of the clamping force generating mechanism to the first platen, thereby contributing to good mold clamping.

[0015] As yet another aspect of the blow molding machine, it is desirable that the mold clamping force generating mechanism includes: a shaft member that is connected to the other end side of the first link mechanism and moves back and forth in a horizontal direction in conjunction with rotation of the first link mechanism; a biasing member that is disposed on the outer periphery of the shaft member and elastically deforms in accordance with the forward and backward movement of the shaft member; and a biasing force transmission member that is disposed on the outer periphery of the biasing member and transmits the biasing force generated by the elastic deformation of the biasing member to a first platen.

[0016] In this way, in the present invention, the mold clamping force generating mechanism is composed of a shaft member linked to the first link mechanism, a biasing member that elastically deforms with the forward and backward movement of the shaft member, and a biasing force transmission member that transmits the biasing force of the biasing member to the first platen. This makes it possible to apply the mold clamping force to the first platen with a relatively simple configuration. Effect of the Invention

[0017] According to the present invention, since the drive mechanism is disposed so as to overlap the first platen or the second platen in the vertical direction, it is possible to prevent the blow molding machine from becoming large in the horizontal direction. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a front view of a blow molding machine according to the present invention. [Diagram 2] 1 is a side view of a mold clamping device of a blow molding machine according to the present invention. [Diagram 3] 3 is a side view showing a mold open state of the mold clamping device shown in FIG. 2. [Figure 4] 3 is a side view showing a clamping state of the clamping device shown in FIG. 2. [Diagram 5] 5 is an enlarged view of a main part of the mold clamping device shown in FIG. 4 in a mold-closed state before a mold clamping force is generated. FIG. [Figure 6] 5 is an enlarged view of a main part of the clamping device shown in FIG. 4 in a clamping state after a clamping force is generated. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] 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 applied to a blow molding machine.

[0020] (Configuration of blow molding machine) Fig. 1 shows a front view of a blow molding machine 1 according to this embodiment. Note that, for the molding die 3 in the following description, Figs. 2 to 4 shall be referred to.

[0021] For example, as shown in FIG. 1, a hollow molding machine 1 according to this embodiment includes an extruder (not shown) that melts and extrudes a synthetic resin, a die head 2 that is provided at the tip of the extruder and causes a cylindrical parison P to droop, a molding die 3 for molding the parison P into a hollow molded product, a clamping device 4 that opens and closes the molding die 3 and clamps it, a parison cutting device (not shown) that cuts the drooping parison P to a predetermined length, a mold transfer device 6 that transfers the molding die 3 back and forth between predetermined positions, an air blowing device 7 that supplies compressed air to the inside of the parison P contained in the molding die 3, and a removal device 8 that removes the molded product S.

[0022] That is, in the blow molding machine 1, the parison P extruded from the die head 2 and hanging down is housed in the open molding die 3, and while it is clamped by the clamping device 4, it is transferred by the mold transfer device 6 to just below the air blowing device 7. The air blowing device 7 inserts a blow pin 9 from the top of the molding die 3 and blows compressed air into the parison P in the molding die 3, thereby pressing the expanded parison P against the cavity formed inside the molding die 3 to form a molded product S. Thereafter, the molding die 3 is moved to just below the die head 2, which is the original position, in the open state, and the blow pin 9 suspends the molded product S, and the removal device 8 removes the molded product S from the blow pin 9 and carries it out.

[0023] (Configuration of the mold clamping unit) Fig. 2 shows a side view of the mold clamping unit 4. Fig. 3 shows a side view of the mold clamping unit 4 in a mold open state. Fig. 4 shows a side view of the mold clamping unit 4 in a mold clamped state.

[0024] For example, as shown in Figures 2, 3, and 4, the mold clamping device 4 includes a pair of link mechanisms, a first link mechanism L1 and a second link mechanism L2, which are arranged opposite each other in the horizontal direction and rotate around their middle parts as fulcrums, and a drive mechanism DM that rotates the first link mechanism L1 and the second link mechanism L2 by pushing and pulling one end side of the first link mechanism L1 and the second link mechanism L2, respectively.

[0025] 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 extending in the vertical direction and having their longitudinal middle portions 411a, 412a rotatably supported on a support frame 40 serving as a base via a pin 401, a first upper link 421 and a second upper link 422 connected to one longitudinal end portion (upper end portion 411b, 412b) of the first main link 411 and the second main link 412 respectively via a pin 402, and a first lower link 431 and a second lower link 432 connected to the other longitudinal end portion (lower end portion 411c, 412c) of the first main link 411 and the second main link 412 respectively via a pin 403. Although this embodiment illustrates an example in which the first link mechanism L1 and the second link mechanism L2 are composed of three links, the first link mechanism L1 and the second link mechanism L2 may be composed of either a single link or multiple links, and the division amount of the multiple links can also be changed as desired.

[0026] As shown in Fig. 2, Fig. 3 and Fig. 4, the first main link 411 and the second main link 412 are plate-shaped and generally obtuse-angled triangular, and a pin 401 is inserted through each of intermediate portions 411a, 412a in the longitudinal direction near the apex angle, and the first main link 411 and the second main link 412 are supported by the support frame 40 via the pin 401. In this manner, the first main link 411 and the second main link 412 are rotatable so as to tilt with the pin 401 as a fulcrum. More specifically, the first main link 411 and the second main link 412 rotate with the pin 401 as a fulcrum by the lower end portions 411c, 412c of the first main link 411 and the second main link 412 being 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, thereby opening and closing the molding die 3 via the first platen 451 and the second platen 452 described below.

[0027] The first upper link 421 and the second upper link 422 are disposed in pairs facing each other on both sides in the plate thickness direction of the upper ends 411b, 412b of the first main link 411 and the second main link 412. That is, the first end portions 421a, 422a of the first upper link 421 and the second upper link 422 in the longitudinal direction sandwich the upper ends 411b, 412b of the first main link 411 and the second main link 412, and are connected to the upper ends 411b, 412b of the first main link 411 and the second main link 412 via the pins 402 penetrating the first end portions 421a, 422a. In addition, the first upper link 421 and the second upper link 422 have second longitudinal ends 421b, 422b respectively connected to a first platen 451 and a second platen 452 for attaching the molding die 3 (first molding die 31 and second molding die 32) via pins 404.

[0028] 2, 3 and 4, the first lower link 431 and the second lower link 432 are disposed in pairs facing each other on both sides in the plate thickness direction of the lower ends 411c, 412c of the first main link 411 and the second main link 412 (see FIG. 1). That is, the first lower link 431 and the second lower link 432 have first ends 431a, 432a in the longitudinal direction that sandwich the lower ends 411c, 412c of the first main link 411 and the second main link 412 (see FIG. 1), and are connected to the lower ends 411c, 412c of the first main link 411 and the second main link 412 via pins 403 that pass through the lower ends 411c, 412c. Further, first lower link 431 and second lower link 432 have second longitudinal ends 431b, 432b each connected to crank member 44 via pin 405 in a flexibly and extensibly manner.

[0029] 1 to 4, the drive mechanism DM is made up of a motor M, a drive shaft 400 which rotates integrally with the output shaft of the motor M, and a crank member 44 which is connected to the drive shaft 400 and inserted into a shaft insertion hole 440 which penetrates the center so as to be integrally rotatable. As shown in FIGS. 2, 3 and 4, the crank member 44 is disposed so as to overlap vertically below the first platen 451 and the second platen 452, is formed in a slightly flattened shape, and is provided rotatable by the motor M (see FIG. 1) via the drive shaft 400.

[0030] Here, the drive mechanism DM only needs to be configured to be able to push and pull the lower ends 411c, 412c of the first main link 411 and the second main link 412, and can be configured with, for example, a cylinder that advances and retreats in a horizontal direction instead of the motor M, drive shaft 400, and crank member 44 exemplified in this embodiment. Also, the drive mechanism DM may be arranged so as to overlap vertically above the first platen 451 to the second platen 452, in addition to the mode exemplified in this embodiment in which it overlaps vertically below the first platen 451 to the second platen 452.

[0031] Furthermore, the motor M only needs to be capable of rotating the crank member 44, and can be replaced with various actuators capable of rotating the crank member 44 in accordance with the specifications of the blow molding machine, other than the motor M. Also, the crank member 44 only needs to be disposed so as to overlap either the first platen 451 or the second platen 452 vertically below the first platen 451 or the second platen 452, and does not need to overlap both the first platen 451 and the second platen 452.

[0032] 3, the crank member 44 bends the connecting portion between the first lower link 431 and the second lower link 432 to the greatest extent, and pulls the lower ends 411c, 412c of the first main link 411 and the second main link 412 to the greatest extent via the first lower link 431 and the second lower link 432, thereby rotating the first main link 411 and the second main link 412 in the mold opening direction. On the other hand, when the crank member 44 is in an angular position (phase) as shown in FIG. 4, it extends the connection portion with the first lower link 431 and the second lower link 432 to the greatest extent, and pushes the lower ends 411c, 412c of the first main link 411 and the second main link 412 to the greatest extent via the first lower link 431 and the second lower link 432, thereby rotating the first main link 411 and the second main link 412 in the mold closing direction.

[0033] The first platen 451 and the second platen 452 are attached to the first molding die 31 and the second molding die 32, which are formed by dividing the molding die 3 into left and right halves (horizontally), via bolts (not shown), and move together 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 horizontally along the mold opening and closing direction of the molding die 3, and are horizontally slidable along the movable table 46. The movable table 46 is not limited to the LM guide, and can be changed to a movable table other than the LM guide according to the specifications of the blow molding machine. On the other hand, it is desirable that the movable table 46 has a rigidity sufficient to resist a load acting from above, such as the LM guide exemplified in this embodiment.

[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 to a synchronization mechanism TM that synchronizes the opening and closing movements of the first molding die 31 and the second molding die 32 via the first extension portion 451b and the second extension portion 452b. The synchronization mechanism TM is composed of a first rack bar 481 and a second rack bar 482 that are arranged opposite to each other in the horizontal direction and extend along the movable base 46 to link with the first extension portion 451b and the second extension portion 452b, 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. Here, the pinion shaft 480 is provided so as to extend generally vertically from 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 a synchronous manner along the movable base 46 in a direction approaching or separating from each other.

[0035] Further, a first clevis 471 and a second clevis 472 which are connected to the first upper link 421 and the second upper link 422, respectively, are connected to the outer sides of the first platen 451 and the second platen 452 facing the first upper link 421 and the second upper link 422 via bolts (not shown). The first clevis 471 is connected to the first upper link 421 via a clamping force generating mechanism 5 which generates a clamping force when the molding die 3 is closed. On the other hand, the second clevis 472 is provided with a link connection part 472a formed in a substantially plate shape at its outer end, and the link connection part 472a is sandwiched between second ends 422b, 422b of a pair of second upper links 422, 422 and connected to the second upper links 422, 422 via a pin 404.

[0036] The mold clamping force generating mechanism 5 includes a generally rod-shaped shaft member 51 connected to the first upper link 421 via a pin 404, a biasing member 52 that is disposed on the outer circumferential side of the shaft member 51 and serves as a source of generation of the mold clamping force, and a biasing force transmission member 53 that is disposed on the outer circumferential side of the biasing member 52 and transmits the biasing force of the biasing member 52 to the first clevis 471. That is, the mold clamping force generating mechanism 5 is incorporated inside the first clevis 471 and cooperates with the first clevis 471 to transmit the biasing force of the biasing member 52 to the first clevis 471 via the biasing force transmission member 53, thereby transmitting the biasing force of the biasing member 52 from the first clevis 471 to the first molding die 31 via the first platen 451.

[0037] The shaft member 51 has a first end 511 in the axial direction, which is formed to have a reduced width, for example, in a two-face width shape, and the first end 511 is sandwiched between a pair of first upper links 421, 421, and a pin 404 is inserted into a through hole (not shown) penetrating in the thickness direction, so that the first end 511 is connected to the first upper links 421, 421 so as to be relatively rotatable. The shaft member 51 has a first male screw portion 513 formed on the outer periphery of a middle portion close to the first end 511, and a first nut 541 having a substantially cylindrical shape is screwed to the outer periphery of the first male screw portion 513. On the other hand, the shaft member 51 has a second male screw portion 514 formed on the outer periphery of a second end 512 opposite to the first end 511, and a second nut 542 is screwed to the second male screw portion 514. The first platen 451 has a shaft receiving hole 451a formed in the center thereof, and the second end 512 of the shaft member 51 including the second nut 542 can be received in the shaft receiving hole 451a.

[0038] The urging member 52 is, for example, a plurality of disc springs arranged in the axial direction, each having an inner diameter smaller than the outer diameter of the first nut 541, and is compressed and deformed by the application of a pressing force from the first nut 541, which moves in the axial direction integrally with the shaft member 51, and generates a mold clamping force by its restoring force. Note that in addition to the plurality of disc springs exemplified in this embodiment, the urging member 52 can be any other member, such as a coil spring, that can generate a urging force by elastically deforming based on a pressing force acting in the axial direction, depending on the specifications of the blow molding machine, etc.

[0039] The biasing force transmission member 53 is accommodated in a transmission member accommodating portion 471a that is provided so as to penetrate the center of the first clevis 471, and has a roughly cylindrical tubular portion 530 that surrounds the outer circumferential side of the biasing member 52, a disc-shaped first end wall portion 531 that is attached to a first axial end of the tubular portion 530, and a disc-shaped second end wall portion 532 that is attached to a second end of the tubular portion 530 opposite the first end.

[0040] The tubular portion 530 has a cylindrical tubular main body 530a capable of accommodating the biasing member 52, and a flange portion 530b formed in an expanded shape on the outer circumferential side of the first end of the tubular main body 530a. The tubular main body 530a has an urging member accommodating portion 530c having an inner diameter slightly larger than that of the biasing member 52, and an outer diameter formed slightly smaller than the inner diameter of the transmission member accommodating portion 471a, and is slidably accommodated in the transmission member accommodating portion 471a. The flange portion 530b is set to an outer diameter larger than the inner diameter of the transmission member accommodating portion 471a, and is provided so as to face the outer surface of the first clevis 471 in the axial direction. The tubular portion 530 is fixed to the first clevis 471 via a plurality of bolts B0 inserted through the flange portion 530b.

[0041] The first end wall portion 531 is formed in an annular shape, has a first shaft through hole 531a therein set to an inner diameter larger than the outer diameter of the first nut 541, and is fixed to an end face of the first end of the cylindrical main body 530a via a plurality of bolts B1. A cylindrical bushing 551 made of a low-friction material such as fluororesin is press-fitted into the first shaft through hole 531a, and the bushing 551 ensures good sliding of the first nut 541 inserted therein.

[0042] The second end wall portion 532 is formed in an annular shape, has an outer diameter equal to the outer diameter of the cylindrical main body 530a, and is fixed to the end face of the second end of the cylindrical main body 530a via a plurality of bolts B2. The second end wall portion 532 has a second shaft through hole 532a therein, the inner diameter of which is set to be larger than the outer diameter of the shaft member 51 and smaller than the outer diameter of the disc spring which is the biasing member 52, and the biasing force of the biasing member 52 housed on the inner periphery side of the cylindrical main body 530a can act on the inner surface of the second end wall portion 532. A cylindrical bush 552 made of a low-friction material such as fluororesin is press-fitted into the second shaft through hole 532a, and the bush 552 ensures good sliding of the shaft member 51 inserted therein.

[0043] With the above-mentioned configuration, when the shaft member 51 moves in the mold closing direction (leftward in Figs. 2 to 4), the biasing member 52 is compressed by the first nut 541, and the restoring force of this compressive deformation presses the cylindrical main body 530a together with the second end wall portion 532 in the mold closing direction. As a result, the first end wall portion 531 and the cylindrical portion 530 move together with the shaft member 51 in the mold closing direction, and the flange portion 530b presses the first clevis 471 in the mold closing direction. In this way, the first clevis 471 is biased in the mold closing direction via the flange portion 530b of the biasing force transmission member 53, and a mold clamping force acts on the first molding die 31 from the first clevis 471 via the first platen 451.

[0044] (Explanation of the operation of the clamping force generating mechanism) Fig. 5 shows an enlarged view of the main part of the mold clamping device 4 in a mold closed state, in which the periphery of the mold clamping force generating mechanism 5 of the mold clamping device 4 is enlarged. Fig. 6 shows an enlarged view of the main part of the mold clamping device 4 in a mold closed state, in which the periphery of the mold clamping force generating mechanism 5 of the mold clamping device 4 is enlarged. Note that, hereinafter, the operation of the mold clamping force generating mechanism 5 will be described with reference to Figs. 5 and 6, while also referring to Figs. 3 and 4, which correspond to overall views of the mold clamping device 4.

[0045] First, from the mold open state of the molding die 3 (the first molding die 31 and the second molding die 32) shown in Fig. 3, the crank member 44 rotates counterclockwise, and the first lower link 431 and the second lower link 432 each extend. Then, the first main link 411 rotates counterclockwise by being pushed by the extended first lower link 431 and second lower link 432, and the second main link 412 rotates clockwise. Then, the first upper link 421 and the second upper link 422 each extend in the mold closing direction by being pushed by the rotated first main link 411 and second main link 412, and press the first platen 451 and the second platen 452 in the mold closing direction. Then, due to this pressing force, the first platen 451 and the second platen 452 slide along the movable table 46 in the mold closing direction, moving the first molding die 31 and the second molding die 32, respectively, in the mold closing direction, resulting in the mold closing state shown in Figure 5.

[0046] 5 is a state in which flange portion 530b of cylindrical portion 530 of biasing force transmission member 53 abuts against the outer surface of first clevis 471, biasing member 52 is in an uncompressed state, and first upper link 421 is in an inclined state in which center line CL is inclined by a slight relative angle θ with respect to horizontal line HL. In this inclined state, since biasing member 52 is in an uncompressed state, no clamping force is generated in clamping force generating mechanism 5, and no clamping force acts on first molding die 31 via first clevis 471.

[0047] Next, from the mold closing state shown in Fig. 5, the shaft member 51 of the mold clamping force generating mechanism 5 is pressed in the mold clamping direction based on further tilting (rotation) of the first main link 411, and the pressed shaft member 51 moves in the mold clamping direction until the relative angle θ between the first upper link 421 and the horizontal line becomes zero, as shown in Fig. 6. Then, the first nut 541 moving integrally with the shaft member 51 abuts against the vicinity of the center of the outer end of the biasing member 52, and the first nut 541 compresses and deforms the biasing member 52. Then, the biasing force of the biasing member 52 generated by this compressive deformation presses the cylindrical portion 530 in the mold closing direction via the first end wall portion 531, and the flange portion 530b of the cylindrical portion 530 presses the first clevis 471 in the mold closing direction. As a result, the biasing force of the biasing member 52 is transmitted from the first clevis 471 via the first platen 451 to the first molding die 31, and a clamping force acts on the first molding die 31, causing the molding die 3 (first molding die 31 and second molding die 32) to be in a clamped state.

[0048] (Effects of this embodiment) As described above, according to the blow molding machine of this embodiment, the crank member 44 is arranged so as to overlap in the vertical direction (vertically below in this embodiment) with the first platen 451 or the second platen 452 (the first platen 451 in this embodiment). Therefore, compared to a conventional blow molding machine in which the crank member 44 is arranged in series in the horizontal direction with respect to the first platen 451, it is possible to prevent the blow molding machine 1 from becoming large in the opening and closing direction of the molding die 3 in the horizontal direction.

[0049] In this embodiment, the lower portions of the first platen 451 and the second platen 452 are supported on a movable base 46 that is horizontally movable. Therefore, the driving force of the blow pin 9 acting vertically downward on the molding die 3 can be supported by the movable base 46. As a result, the driving force of the blow pin 9 does not act on the first and second upper links 421, 422, the first and second main links 411, 412, and the first and second lower links 431, 432, and uneven wear of the first and second upper links 421, 422, the first and second main links 411, 412, the first and second lower links 431, 432, and the pins 401 to 405 connected to the links can be suppressed.

[0050] In this embodiment, the first platen 451 and the second platen 452 are configured to be movable by an equal distance on the movable table 46 via a synchronization mechanism TM in conjunction with the synchronization mechanism TM. This makes it possible to always keep the clamping position of the molding die 3 constant, and to maintain the parting line PL of the molding die 3 constant. This makes it possible to suppress variations in thickness and cooling of the molded product S that may occur due to deviations in the clamping position of the molding die 3.

[0051] Furthermore, in this embodiment, the clamping force generating mechanism 5 is provided adjacent to the first platen 451 between the first platen 451 and the first link mechanism L1, i.e., between the first platen 451 and the first upper link 421. This makes it possible to directly and efficiently transmit the clamping force of the clamping force generating mechanism 5 to the first platen 451, which can contribute to good clamping of the molding die 3.

[0052] In this embodiment, the mold clamping force generating mechanism 5 is made up of a shaft member 51 linked to the first link mechanism L1, a biasing member 52 that elastically deforms as the shaft member 51 moves back and forth, and a biasing force transmission member 53 that transmits the biasing force of the biasing member 52 to the first platen 451. This makes it possible to apply the mold clamping force to the first platen 451 with a relatively simple configuration.

[0053] In this embodiment, the drive mechanism DM is composed of a motor M, a drive shaft 400 which rotates integrally with the output shaft of the motor M, and a crank member 44 which is connected to the drive shaft 400 inserted into a shaft insertion hole 440 which penetrates the center so as to be integrally rotatable, and the drive shaft 400 connected to the crank member 44 is driven and controlled by the motor M. This makes it possible to more precisely control the rotation of the crank member 44, which contributes to good opening and closing operations of the molding die 3.

[0054] The present invention is not limited to the configurations and aspects exemplified in the above-described embodiments, and can be freely modified depending on the specifications and costs of the target application as long as the form can achieve the above-described effects of the present invention. [Explanation of symbols]

[0055] 1...Blow molding machine 2…Die head 3…Molding tool 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…First platen 452…Second platen 46…Movable base 5. Clamping force generating mechanism 51...Shaft member 52... Urging member 53... Urging force transmission member 9…Blow pin L1: First link mechanism L2: Second link mechanism DM…Drive mechanism TM…tuning mechanism

Claims

1. a first link mechanism and a second link mechanism that are a pair of link mechanisms provided opposite to each other in a horizontal direction and each of which rotates about a middle portion; 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 that is linked to the other end side of the first link mechanism and supports the first molding die of a pair of first and second molding dies; a second platen provided opposite to the first platen in a horizontal direction, linked to the other end of the second link mechanism, and supporting the second molding die; a 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 generates a mold clamping force in a state in which 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 the above.

2. The blow molding machine according to claim 1, A blow pin is inserted into the upper portion of the pair of molds for blow molding, The first platen and the second platen are placed on movable tables that are movable in a horizontal direction. A blow molding machine characterized by the above.

3. The blow molding machine according to claim 2, The first platen and the second platen are linked to a synchronization mechanism that synchronizes the opening and closing movements of the pair of molds. A blow molding machine characterized by the above.

4. The blow molding machine according to any one of claims 1 to 3, the mold clamping force generating mechanism is provided adjacent to the first platen between the first platen and the first link mechanism; A blow molding machine characterized by the above.

5. The blow molding machine according to claim 1, The mold clamping force generating mechanism includes: a shaft member connected to the other end of the first link mechanism and adapted to move forward and backward in a horizontal direction in conjunction with the rotation of the first link mechanism; a biasing member that is disposed on an outer circumferential side of the shaft member and elastically deforms in response to the forward and backward movement of the shaft member; a biasing force transmission member provided on an outer circumferential side of the biasing member and configured to transmit a reaction force generated by elastic deformation of the biasing member to a first platen; Equipped with A blow molding machine characterized by the above.

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