Blow molding machine

Abstract

To provide a blow molding machine provided with a flow rate adjustment mechanism capable of preventing troubles such as resin leakage from a flow channel and sticking caused during movement of a flow rate adjustment member.SOLUTION: In a blow molding machine, a first flow rate adjustment member 71, a second flow rate adjustment member 72, and a third flow rate adjustment member 73 are located in a fixed state on the downstream side of a first branch passage 61, a second branch passage 62, and a third branch passage 63. This eliminates the need to provide sliding parts between a die head 1 and the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73, thus resin leakage can be suppressed from a first flow channel 710, a second flow channel 720, and a third flow channel 730, as well as the risk of so-called galling can be avoided between the die head 1 and the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

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

[0003] To explain briefly, in this injection molding machine, when introducing resin material into multiple cavities in a multi-cavity mold, the cross-sectional area of ​​the flow path is changed by adjusting the protrusion amount of a flow control member provided to cross the flow path midway through the flow path. In other words, by adjusting the cross-sectional area of ​​the flow path connected to multiple cavities, it is possible to suppress variation in the flow rate of resin material to multiple cavities and introduce resin material at an equal flow rate.

[0004] The above is an example of an injection molding machine, but similar technology is also used in so-called multi-head blow molding machines that have multiple cavities. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-269970 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the conventional molding machine, the cross-sectional area of ​​the flow path is changed by adjusting the protrusion amount of the flow rate adjustment member. That is, if the gap between the sliding part between the die head component member and the flow rate adjustment member constituting the flow path is large, there is a risk of resin leakage through the gap, and conversely, if the gap between the sliding part between the die head component member and the flow rate adjustment member is small, there is a risk of so-called seizing occurring when the flow rate adjustment member slides, so there is still room for improvement.

[0007] Therefore, the present invention has been devised in consideration of the technical problems associated with the conventional molding machines, and aims to provide a blow molding machine that can suppress problems such as resin leakage from the flow path and sticking that occurs when the flow control member moves. [Means for solving the problem]

[0008] One aspect of the blow molding machine of the present invention is a multi-head blow molding machine capable of molding a plurality of molded products in one cycle, and is provided with a flow control member that is detachably mounted on a die head having a plurality of flow paths formed therein for directing molten resin material to a plurality of cavities of a molding die, and is fixedly disposed midway through the plurality of flow paths to change the cross-sectional area of ​​the plurality of flow paths, and the flow control member has an inlet side flow path connected to the upstream side of the plurality of flow paths, an outlet side flow path connected to the downstream side of the plurality of flow paths, and a throttling flow path formed between the inlet side flow path and the outlet side flow path and having an inner diameter smaller than the inlet side flow path and the outlet side flow path.

[0009] In this way, according to the present invention, the die head that configures the multiple flow paths is provided with a flow rate adjusting member that changes the cross-sectional area of ​​the flow path in a removable manner. Therefore, by appropriately replacing the flow rate adjusting member in the flow path that requires flow rate adjustment, the resin material can be guided to each cavity at a uniform flow rate in each of the multiple flow paths.

[0010] The flow rate adjusting member is fixedly disposed in the middle of the multiple flow paths, and is not movable as in the conventional method, which eliminates the need to provide a sliding portion between the die head and the flow rate adjusting member, thereby making it possible to suppress leakage of the resin material from the flow paths.

[0011] In addition, the flow rate adjusting member is fixedly disposed in the middle of the multiple flow paths, and is not movable as in the conventional method, so there is no risk of so-called seizing occurring between the flow rate adjusting member and the die head.

[0012] In another aspect of the blow molding machine, it is desirable that the flow rate control member has a tapered portion connecting the inlet side flow path or the outlet side flow path to the throttle flow path at least one of the boundary between the inlet side flow path and the throttle flow path and the boundary between the outlet side flow path and the throttle flow path.

[0013] In this way, according to the present invention, a tapered portion is provided that connects the inlet-side flow path or the outlet-side flow path to the throttle flow path, so that a step is not formed between the inlet-side flow path or the outlet-side flow path and the throttle flow path, and retention of the resin material in the step portion can be suppressed.

[0014] In yet another aspect of the blow molding machine, it is desirable that the flow control member be held in a sandwiched state between an upstream member that forms a flow path upstream of the flow control member among the multiple flow paths, and a downstream member that forms a flow path downstream of the flow control member.

[0015] Thus, according to the present invention, the flow rate control member is configured to be held in a sandwiched state between the upstream member and the downstream member that constitute the die head. Therefore, there is no need to provide an attachment means for attaching the flow rate control member to the die head, and it is possible to omit the space and processing related to the attachment means in the flow rate control member. As a result, the flow rate control member can be made smaller by the amount of space required for the attachment means in the flow rate control member, and the manufacturing cost can be reduced by the amount of processing related to the attachment means.

[0016] In addition, since the flow rate control member is held in a sandwiched state between the upstream member and the downstream member, the flow rate control member can be attached to the die head without performing any additional attachment work such as fastening, etc. This makes it possible to easily perform the attachment / detachment (replacement) work of the flow rate control member, and facilitates the work of adjusting the flow rate of the resin material.

[0017] In still another aspect of the blow molding machine, it is preferable that the flow rate adjusting member is formed in a disk shape and is fitted into a circular fitting portion provided on the die head.

[0018] Thus, according to the present invention, the flow rate adjusting member is formed in a disk shape and is configured to be fitted into a circular fitting portion provided on the die head, which makes it possible to easily process the flow rate adjusting member and the fitting portion of the die head, thereby contributing to reducing the manufacturing costs of molded products.

[0019] In yet another aspect of the blow molding machine, it is desirable that the flow rate control member be formed in a disk shape, with one axial end side being fitted into an upstream fitting portion provided on the upstream member and the other axial end side being fitted into a downstream fitting portion provided on the downstream member, so that the flow rate control member is provided across the upstream member and the downstream member.

[0020] Thus, according to the present invention, the flow rate adjustment member is provided across both the upstream member and the downstream member by fitting into the upstream fitting portion and the downstream fitting portion. Therefore, the flow rate adjustment member functions as a so-called positioning member such as a positioning pin, and can achieve positioning when connecting the upstream member and the downstream member. This makes it possible to connect the upstream member and the downstream member with good accuracy, which contributes to the configuration of a smoother flow path. Effect of the Invention

[0021] According to the present invention, since the flow rate control member is fixedly disposed in the middle of the multiple flow paths and is not movable as in the conventional method, there is no need to provide a sliding part between the die head and the flow rate control member, and leakage of the resin material from the flow paths can be suppressed. In addition, since the flow rate control member is fixedly disposed in the middle of the multiple flow paths and is not movable as in the conventional method, there is no risk of so-called galling between the flow rate control member and the die head. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a front view of a blow molding machine according to the present invention. [Diagram 2] FIG. 2 is a plan view of a branch plate showing the first embodiment of the present invention. [Diagram 3] 3A and 3B show the flow rate adjusting member shown in FIG. 2, in which (a) is a perspective view and (b) is a cross-sectional view taken along line AA in (a). [Figure 4] FIG. 4 is a partial cross-sectional view of the die head shown in FIG. 1 according to a second embodiment of the present invention. [Diagram 5] 5A and 5B show the flow rate adjusting member shown in FIG. 4, in which (a) is a plan view and (b) is a cross-sectional view taken along line BB in (a). [Figure 6] FIG. 11 is a partial cross-sectional view of the die head shown in FIG. 1 according to a third embodiment of the present invention. [Figure 7] 7A and 7B show the flow rate adjusting member shown in FIG. 6, in which (a) is a plan view and (b) is a cross-sectional view taken along line CC in (a). [Figure 8] FIG. 1 is a plan view of a branch plate in a conventional blow molding machine. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, an embodiment of a blow molding machine according to the present invention will be described in detail with reference to the drawings. In this embodiment, the present invention is applied to a multi-head blow molding machine capable of molding a plurality of molded products in one cycle.

[0024] (Blow molding machine configuration) FIG. 1 shows a front view of a blow molding machine according to the present invention.

[0025] For example, as shown in FIG. 1, the blow molding machine of this embodiment includes an extruder (not shown) that melts and extrudes a synthetic resin material (hereinafter simply referred to as "resin"), a multi-head die head 1 that is provided at the tip of the extruder (not shown) and causes a plurality of cylindrical parisons P to suspend down, a molding die D that molds the parisons P into a hollow molded product, a mold clamping device 2 that opens and closes the molding die D and clamps it, a mold transfer device 3 that transfers the molding die D back and forth between specified positions, an air blowing device 4 that supplies compressed air into the inside of the parison P contained in the molding die D, and a removal device 5 that removes the molded product S.

[0026] That is, in the blow molding machine, the parison P extruded from the die head 1 and hanging down is contained in an open molding die D and, while still clamped by the clamping device 2, is transferred by the mold transfer device 3 to just below the air blowing device 4. The air blowing device 4 lowers a blow pin (not shown) and inserts it into the molding die D, and blows compressed air into the parison P in the molding die D, thereby pressing the expanded parison P against a cavity (not shown) formed in the molding die D to form a molded product S. Then, in an open state, the molding die D moves to just below the die head 1, which is the original position, while the blow pin suspends the molded product S, and a removal device 5 removes the molded product S from the blow pin and carries it to the outside.

[0027] [First embodiment] FIG. 2 shows a first embodiment of the blow molding machine according to the present invention, and shows a plan view of a branch plate 10 constituting the die head 1 shown in FIG.

[0028] 2, for example, the die head 1 has a branch plate 10 as an upstream member for dividing the resin extruded from the extruder (not shown) arranged on the back surface of the die head 1, and a first body block 11, a second body block 12, and a third body block 13 as a plurality of body blocks as downstream members to which the resin divided by the branch plate 10 is respectively guided. The first body block 11, the second body block 12, and the third body block 13 are each fastened to a front side wall portion of the branch plate 10 via a plurality of first bolts BT1.

[0029] The branch plate 10 has a flow path 6 on the upper surface, which branches from the back side (rear side) toward the front side (near side), and this branched flow path 6 introduces resin into a first vertical passage 110, a second vertical passage 120, and a third vertical passage 130 that penetrate the first main body block 11, the second main body block 12, and the third main body block 13 along the vertical direction, respectively. Specifically, the flow path 6 includes a main passage 60 whose upstream side is connected to the extruder not shown, and a first branch passage 61, a second branch passage 62, and a third branch passage 63 that are branched in three directions from the downstream end of the main passage 60 and connected to the first vertical passage 110, the second vertical passage 120, and the third vertical passage 130, which are integrally formed continuously. The first branch passage 61 and the third branch passage 63 each branch off to either side of the second branch passage 62, with their downstream sides extending parallel to the second branch passage 62, and have a relatively long flow path length compared to the second branch passage 62, and a relatively larger flow path diameter (flow path cross-sectional area) than the second branch passage 62. In this manner, the flow path diameter (flow path cross-sectional area) is adjusted according to the flow path lengths of the first branch passage 61, the second branch passage 62, and the third branch passage 63, so that the flow rates of resin introduced downstream of the first branch passage 61, the second branch passage 62, and the third branch passage 63 branched off from the main passage 60, i.e., into a plurality of cavities not shown, are configured to be approximately equal.

[0030] In addition, the die head 1 is provided with a first flow control member 71, a second flow control member 72 and a third flow control member 73 between the branch plate 10 and the first main body block 11, the second main body block 12 and the third main body block 13, which are flow control members having a first flow path 710, a second flow path 720 and a third flow path 730 connecting the first branch passage 61, the second branch passage 62 and the third branch passage 63 to the first vertical passage 110, the second vertical passage 120 and the third vertical passage 130, respectively. The first flow control member 71, the second flow control member 72 and the third flow control member 73 are each formed in a disk shape with the same outer shape, have a first flow path 710, a second flow path 720 and a third flow path 730 in the center, and are arranged in a sandwiched state between the branch plate 10 and the first main body block 11, the second main body block 12 and the third main body block 13, respectively. By changing (replacing) the first flow control member 71, the second flow control member 72 and the third flow control member 73, the flow path diameter (flow path cross-sectional area) of the first flow path 710, the second flow path 720 and the third flow path 730 can be adjusted, and the flow rate of resin introduced downstream of the first branch passage 61, the second branch passage 62 and the third branch passage 63, i.e., into multiple cavities not shown in the figure, can be adjusted.

[0031] Specifically, the first flow control member 71, the second flow control member 72 and the third flow control member 73 are respectively arranged in a state of being fitted between the first plate side fitting portion 101, the second plate side fitting portion 102 and the third plate side fitting portion 103 which are upstream fitting portions formed in a concave shape on the facing end surface of the branch plate 10 to the first main body block 11, the second main body block 12 and the third main body block 13, and the first block side fitting portion 111, the second block side fitting portion 121 and the third block side fitting portion 131 which are downstream fitting portions formed in a concave shape on the facing end surface of the first main body block 11, the second main body block 12 and the third main body block 13 to the branch plate 10, and are clamped in a tight contact state between the branch plate 10 and the first main body block 11, the second main body block 12 and the third main body block 13. That is, the first flow control member 71, the second flow control member 72 and the third flow control member 73 are closely sandwiched between the branch plate 10 and the first main body block 11, the second main body block 12 and the third main body block 13, respectively, thereby making it possible to connect the first branch passage 61, the second branch passage 62 and the third branch passage 63 to the first vertical passage 110, the second vertical passage 120 and the third vertical passage 130, respectively, without any leakage.

[0032] In this way, the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73 are all provided replaceably to adjust the flow rates of the first branch passage 61, the second branch passage 62, and the third branch passage 63. In other words, by changing the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73, it is possible to adjust the flow rates of the resin introduced downstream of the first branch passage 61, the second branch passage 62, and the third branch passage 63, i.e., into multiple cavities not shown.

[0033] Specifically, the first flow control member 71 and the third flow control member 73, which are connected to the first branch passage 61 and the third branch passage 63, which have relatively long flow path lengths, are both set to the same flow path diameter (flow path cross-sectional area) as the first branch passage 61 and the third branch passage 63, and connect the first branch passage 61 and the third branch passage 63 to the first vertical passage 110 and the third vertical passage 130 with the same flow path diameter (flow path cross-sectional area), respectively.

[0034] (Configuration of flow rate adjusting member) 3A and 3B show the second flow rate adjustment member 72 shown in FIG. 2 alone, with (a) being a perspective view and (b) being a cross-sectional view taken along line AA in (a) of the same figure.

[0035] 2 and 3, the second flow rate adjustment member 72 has an inlet-side flow passage 721 set to the same diameter as the second branch passage 62, an outlet-side flow passage 722 set to the same diameter as the second vertical passage 120, and a throttle flow passage 723 provided between the inlet-side flow passage 721 and the outlet-side flow passage 722 and set to a predetermined inner diameter smaller than the inlet-side flow passage 721 and the outlet-side flow passage 722. In this embodiment, in the second flow rate adjustment member 72, the outlet-side flow passage 722 is formed relatively larger than the inlet-side flow passage 721, but the flow passage diameters (flow passage cross-sectional areas) of the inlet-side flow passage 721 and the outlet-side flow passage 722 can be set arbitrarily according to the flow passage diameters (flow passage cross-sectional areas) of the second branch passage 62 and the second vertical passage 120 connected thereto, respectively.

[0036] The second flow rate control member 72 is provided with a first tapered section 724 having a conical taper shape between the inlet side flow path 721 and the throttle flow path 723, the first tapered section 724 having a flow path diameter (flow path cross-sectional area) gradually reduced toward the throttle flow path 723 side, thereby enabling a smooth connection between the inlet side flow path 721 and the throttle flow path 723. Similarly, the second flow rate control member 72 is provided with a second tapered section 725 having a conical taper shape between the throttle flow path 723 and the outlet side flow path 722, the second tapered section 725 having a flow path diameter (flow path cross-sectional area) gradually increased toward the outlet side flow path 722 side, thereby enabling a smooth connection between the throttle flow path 723 and the outlet side flow path 722.

[0037] Further, a pair of female threaded holes 726 are provided on both side end faces of the second flow rate adjustment member 72 at positions symmetrical with respect to the inlet side flow path 721 and the outlet side flow path 722. These female threaded holes 726 are used to remove the second flow rate adjustment member 72 fitted into the second plate side fitting portion 102 of the branch plate 10 or the second block side fitting portion 121 of the second main body block 12. That is, by screwing bolts (not shown) into the female threaded holes 726 and pulling the bolts, it is possible to pull out the second flow rate adjustment member 72 from the second plate side fitting portion 102 or the second block side fitting portion 121 via the bolts.

[0038] (Effects of this embodiment) FIG. 8 shows a plan view of a branch plate in a conventional blow molding machine.

[0039] For example, as shown in Fig. 8, in the conventional blow molding machine, a first flow rate adjustment member P1 and a second flow rate adjustment member P2 capable of changing the flow path cross-sectional area of ​​the first branch passage 61 and the second branch passage 62 are provided in the middle of a first branch passage 61 and a second branch passage 62 formed in a branch plate 10. The first flow rate adjustment member P1 and the second flow rate adjustment member P2 are each formed in a roughly cylindrical shape, and are inserted through a first pin hole 104 and a second pin hole 105 formed in a side end surface of the branch plate 10 and connected to the first branch passage 61 and the second branch passage 62, and are provided so as to be movable forward and backward, respectively. The first flow rate adjustment member P1 and the second flow rate adjustment member P2 move forward and backward, thereby changing the flow path cross-sectional area of ​​the first branch passage 61 and the second branch passage 62, and it is possible to adjust the flow rate of the resin flowing into a plurality of cavities (not shown) of a molding die D connected from the first branch passage 61 and the second branch passage 62 via a first vertical passage 110 and a second vertical passage 120.

[0040] However, in the conventional blow molding machine, as described above, the protrusion amount of the first flow rate adjustment member P1 and the second flow rate adjustment member P2 is adjusted to change the flow path cross-sectional area of ​​each of the first branch passage 61 and the second branch passage 62. That is, when the gap between the die head 1 in which the first pin hole 104 and the second pin hole 105 are formed and the first flow rate adjustment member P1 and the second flow rate adjustment member P2 is large, resin leakage may occur through the gap, and when the gap between the die head 1 in which the first pin hole 104 and the second pin hole 105 are formed and the first flow rate adjustment member P1 and the second flow rate adjustment member P2 is small, so-called galling may occur in the first pin hole 104 and the second pin hole 105 when the first flow rate adjustment member P1 and the second flow rate adjustment member P2 move, so there is still room for improvement.

[0041] In contrast, the blow molding machine according to the present embodiment has the following advantageous effects, thereby solving the problems of the conventional blow molding machines.

[0042] That is, in the blow molding machine according to this embodiment, a first flow rate adjustment member 71, a second flow rate adjustment member 72, and a third flow rate adjustment member 73 capable of changing the flow path cross-sectional area of ​​the first branch passage 61, the second branch passage 62, and the third branch passage 63 are detachably provided on the die head 1 constituting the branched first branch passage 61, the second branch passage 62, and the third branch passage 63. Therefore, in the flow paths that require flow rate adjustment of the resin flowing into a plurality of cavities (not shown) formed inside the molding die D arranged at the bottom of the die head 1, among the plurality of flow paths, the first flow rate adjustment member 71, the second flow rate adjustment member 72, or the third flow rate adjustment member 73 can be appropriately replaced to guide the resin to each of the cavities (not shown) in the first flow path 710, the second flow path 720, and the third flow path 730 at a uniform flow rate.

[0043] In addition, the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73 are fixedly disposed downstream of the first branch passage 61, the second branch passage 62, and the third branch passage 63, and are not movable as in the conventional blow molding machine. Therefore, there is no need to provide a sliding portion between the die head 1 and the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73, and leakage of resin from the first flow path 710, the second flow path 720, and the third flow path 730 can be suppressed.

[0044] Furthermore, the first flow control member 71, the second flow control member 72 and the third flow control member 73 are fixedly arranged downstream of the first branch passage 61, the second branch passage 62 and the third branch passage 63, respectively, and are not movable like the conventional blow molding machines. Therefore, there is no risk of so-called seizing occurring between the die head 1 and the first flow control member 71, the second flow control member 72 and the third flow control member 73.

[0045] Moreover, the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73 are provided individually on the downstream side of the first branch passage 61, the second branch passage 62, and the third branch passage 63 branched off by the branch plate 10. Therefore, compared to a case in which the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73 are integrated into one flow rate adjustment member, it is not only possible to adjust the flow rate with pinpoint accuracy according to the flow rates on the downstream side of the first branch passage 61, the second branch passage 62, and the third branch passage 63, but also it is possible to reduce the size of each of the flow rate adjustment members 71, 72, and 73, which can contribute to improving the workability involved in manufacturing each of the flow rate adjustment members 71, 72, and 73 and reducing manufacturing costs based on a reduction in material.

[0046] In this embodiment, for example, in the second flow rate adjustment member 72, a first tapered portion 724 and a second tapered portion 725 capable of smoothly connecting the inlet side flow path 721 or the outlet side flow path 722 to the throttle flow path 723 are provided at the boundary between the inlet side flow path 721 and the throttle flow path 723 and at the boundary between the outlet side flow path 722 and the throttle flow path 723. As a result, no step is formed between the inlet side flow path 721 and the outlet side flow path 722 and the throttle flow path 723, and retention of resin in the step can be suppressed.

[0047] In this embodiment, the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73 are sandwiched between the branch plate 10, which corresponds to the upstream member constituting the die head 1, and the first main body block 11, the second main body block 12, and the third main body block 13, which correspond to the downstream member. Therefore, there is no need to provide an attachment means for attaching the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73 to the die head 1, and it is possible to omit the space and processing related to the attachment means in the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73. As a result, the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73 can be made smaller by the amount that the space related to the attachment means is not required, and the manufacturing cost can be reduced by the amount that the processing related to the attachment means is not required.

[0048] Furthermore, since the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73 are held in a sandwiched state between the branch plate 10 and the first main body block 11, the second main body block 12, and the third main body block 13, the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73 can be attached to the die head 1 without performing extra attachment work such as fastening. This makes it possible to easily perform the attachment / detachment (replacement) work of the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73, and facilitates the adjustment work of the flow rate of the resin flowing into the multiple cavities (not shown) of the molding die D.

[0049] In this embodiment, the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73 are each formed in a disk shape and are configured to be fitted into the first plate side fitting portion 101, the second plate side fitting portion 102, and the third plate side fitting portion 103, which are circular fitting portions provided on the die head 1, and the first block side fitting portion 111, the second block side fitting portion 121, and the third block side fitting portion 131. This makes it possible to easily process the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73, and to easily process the first plate side fitting portion 101, the second plate side fitting portion 102, and the third plate side fitting portion 103, which are fitting portions of the die head 1, and the first block side fitting portion 111, the second block side fitting portion 121, and the third block side fitting portion 131, which can contribute to reducing the manufacturing cost of molded products.

[0050] In this embodiment, the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73 are provided across the branch plate 10, which is an upstream member, and the first body block 11, the second body block 12, and the third body block 13, which are downstream members, by fitting into the first plate side fitting portion 101, the second plate side fitting portion 102, and the third plate side fitting portion 103, and the first block side fitting portion 111, the second block side fitting portion 121, and the third block side fitting portion 131. Therefore, the first flow rate adjustment member 71, the second flow rate adjustment member 72, and the third flow rate adjustment member 73 can function as so-called positioning members such as positioning pins, and positioning can be achieved when connecting the branch plate 10, which is an upstream member, and the first body block 11, the second body block 12, and the third body block 13, which are downstream members. This makes it possible to connect the branch plate 10 to the first body block 11, the second body block 12, and the third body block 13 with good precision, which can contribute to the configuration of smoother flow paths in the die head 1.

[0051] [Second embodiment] 4 and 5 show a second embodiment of the blow molding machine according to the present invention, in which a first flow rate adjustment member 91 and a second flow rate adjustment member 92 as flow rate adjustment members according to the present invention are arranged inside the first body block 11, the second body block 12 and the third body block 13, rather than between the branch plate 10 and the first body block 11, the second body block 12 and the third body block 13. The basic configuration other than the above changes is the same as that of the first embodiment. Therefore, the same reference numerals are used for the same configuration as the first embodiment, and the description thereof will be omitted.

[0052] (Arrangement of flow rate adjusting members) Fig. 4 shows a second embodiment of the present invention, and is a partial cross-sectional view of the die head 1 shown in Fig. 1. In this embodiment, the configuration of the downstream side of the second branch passage 62, where flow rate adjustment is mainly required, i.e., the downstream side of the second main body block 12, is illustrated.

[0053] As shown in Figure 4, the die head 1 has a body 81 formed in a generally cylindrical shape at the bottom of the second main body block 12, a cylindrical mandrel 82 housed inside the body 81, a mandrel shaft 83 that passes through the inside of the mandrel 82 so as to be axially movable, a generally cylindrical die 84 attached to the bottom of the body 81, and a core (not shown) attached to the lower end of the mandrel shaft 83 and arranged so as to be axially movable inside the die 84.

[0054] The body 81 is divided into two parts in the axial direction, with a first body 811 and a second body 812 arranged in series one above the other and connected via a plurality of third bolts BT3. The body 81 also has a flow path forming portion 810 in the center, which passes through the first body 811 and the second body 812 in the axial direction. The flow path forming portion 810 forms a first introduction flow path 851 and a second introduction flow path 852 between the mandrel main body 821 and the mandrel main body 821, which introduce a resin (not shown) into a cavity (not shown) of the molding die D through a gap between the die 84 and a core (not shown).

[0055] The first introduction flow passage 851 and the second introduction flow passage 852 have a first vertical flow passage 851a and a second vertical flow passage 852a extending vertically from a first branch flow passage 122 and a second branch flow passage 123 branched inside the second main body block 12, a first annular passage 851b and a second annular passage 852b extending circumferentially from the first vertical flow passage 851a and the second vertical flow passage 852a, and a first junction flow passage 851c and a second junction flow passage 852c extending vertically from the first annular passage 851b and the second annular passage 852b to join the resin introduced by the first annular passage 851b and the second annular passage 852b. The body 81 (first body 811) is fixed to the second main body block 12 together with the mandrel 82 by tightening them together via a plurality of second bolts BT2.

[0056] The mandrel 82 has a mandrel body 821 that forms a first introduction flow passage 851 and a second introduction flow passage 852 between the body 81 (flow passage configuration portion 810) (radially) and an annular mandrel flange portion 822 that is provided at the upper end of the mandrel body 821 in an expanded shape, extends in the radial direction, and serves to fix the mandrel 82 to the second main body block 12. A shaft insertion portion 823 that penetrates along the axial direction is provided at the axial center of the mandrel body 821, and the mandrel shaft 83 is inserted into the shaft insertion portion 823 so as to be movable in the axial direction. A plurality of bolt through holes 824 are provided in the mandrel flange portion 822 in the circumferential direction, and the mandrel 82 is fixed to the second main body block 12 via second bolts BT2 that are inserted into the bolt through holes 824.

[0057] The die 84 has a generally cylindrical shape and is fixed to the lower end of the second body 812 via a plurality of fourth bolts BT4 that are inserted into a generally annular die flange portion 840 provided at the upper end in an expanded diameter shape. The core (not shown) housed inside the die 84 is connected to the mandrel shaft 83 and is arranged to be movable vertically together with the mandrel shaft 83. In other words, the core (not shown) moves up and down vertically by the mandrel shaft 83, thereby changing the gap (radial gap) with the die 84 and making it possible to adjust the thickness of the parison P (see FIG. 1).

[0058] In this embodiment, a first fitting portion 124 and a second fitting portion 125 are recessed at the end of the second main body block 12 facing the mandrel 82 (mandrel flange portion 822) and at the outlet opening of the second vertical passage 120. A first flow rate adjustment member 91 and a second flow rate adjustment member 92 are fitted in the first fitting portion 124 and the second fitting portion 125, respectively. At this time, the thickness dimensions of the first flow rate adjustment member 91 and the second flow rate adjustment member 92 are set to be slightly larger than the depth dimensions of the first fitting portion 124 and the second fitting portion 125, respectively, and are configured to be able to closely contact the mandrel flange portion 822 regardless of the variation (tolerance) in the thickness dimensions of the first flow rate adjustment member 91 and the second flow rate adjustment member 92.

[0059] (Configuration of flow rate adjusting member) Fig. 5 shows the first flow rate adjustment member 91 shown in Fig. 4, with (a) being a plan view and (b) being a cross-sectional view taken along line BB in (a) of Fig. 4. Note that since the first flow rate adjustment member 91 and the second flow rate adjustment member 92 both have the same configuration, for convenience, the first flow rate adjustment member 91 will be described in detail below with reference to Fig. 5.

[0060] 4 and 5, the first flow rate adjustment member 91 has an inlet-side flow passage 911 set to the same diameter as the second vertical passage 120, an outlet-side flow passage 912 set to the same diameter as the first vertical passage 851a, and a throttle flow passage 913 provided between the inlet-side flow passage 911 and the outlet-side flow passage 912 and set to a predetermined inner diameter smaller than the inlet-side flow passage 911 and the outlet-side flow passage 912. The flow passage diameters (flow passage cross-sectional areas) of the inlet-side flow passage 911 and the outlet-side flow passage 912 can be set arbitrarily according to the flow passage diameters (flow passage cross-sectional areas) of the second vertical passage 120 and the first vertical passage 851a connected thereto, respectively.

[0061] The first flow rate control member 91 is provided with a first tapered section 914 having a conical taper shape between the inlet side flow path 911 and the throttle flow path 913, the first tapered section 914 having a flow path diameter (flow path cross-sectional area) gradually reduced toward the throttle flow path 913 side, thereby enabling a smooth connection between the inlet side flow path 911 and the throttle flow path 913. Similarly, the first flow rate control member 91 is provided with a second tapered section 915 having a conical taper shape between the inlet side flow path 913 and the outlet side flow path 912, the second tapered section 915 having a flow path diameter (flow path cross-sectional area) gradually increased toward the outlet side flow path 912 side, thereby enabling a smooth connection between the throttle flow path 913 and the outlet side flow path 912.

[0062] Furthermore, a pair of female threaded holes 916 are provided on the surface of the first flow rate adjustment member 91 facing the mandrel flange portion 822 at positions symmetrically sandwiching the inlet-side flow path 911. Each female threaded hole 916 is used to remove the first flow rate adjustment member 91 fitted into the first fitting portion 124, and by screwing a bolt (not shown) into each female threaded hole 916 and pulling the bolt, it is possible to pull out the first flow rate adjustment member 91 from the first fitting portion 124 via the bolt.

[0063] (Effects of this embodiment) As described above, in this embodiment, the first flow rate adjustment member 91 that fits into the first fitting portion 124 provided in the second main body block 12 makes it possible to adjust the flow rate of the resin introduced into the multiple cavities of the molding die D. In this manner, the first flow rate adjustment member 91 as a flow rate adjustment member according to the present invention may be disposed not only between the branch plate 10 and the second vertical passage 120 but also on the downstream side of the second vertical passage 120 as in this embodiment, and even with such a configuration, the same effects as those of the first embodiment can be achieved.

[0064] [Third embodiment] 6 and 7 show a third embodiment of the blow molding machine according to the present invention, in which the first flow rate adjustment member 91 and the second flow rate adjustment member 92 according to the second embodiment are integrally configured as a flow rate adjustment member 90. The basic configuration other than the above changes is the same as that of the first embodiment. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

[0065] (Arrangement of flow rate adjusting members) FIG. 6 shows a third embodiment of the present invention, and is a partial cross-sectional view of the die head 1 shown in FIG.

[0066] 6, in the present embodiment, in the die head 1, a flow rate adjustment member 90 is interposed between the second main body block 12 and the mandrel flange portion 822. That is, in the present embodiment, the flow rate adjustment member 90 formed in a rectangular plate shape is interposed between the second main body block 12 and the mandrel flange portion 822, and the second vertical passage 120 is connected to the first vertical passage 851a and the second vertical passage 852a via a first passage 901 and a second passage 902 provided in the flow rate adjustment member 90.

[0067] The flow rate adjustment member 90 is fastened together with the first body 811 and the mandrel 82 to the second main body block 12 via a plurality of second bolts BT2 inserted into bolt insertion holes 903 formed through the periphery of the flow rate adjustment member 90. In addition, the flow rate adjustment member 90 has a flow path forming portion 904 in which the first flow path 901 and the second flow path 902 are formed, which is formed slightly thicker than the mounting flange portion 905 in which the bolt insertion holes 903 are formed, and is configured so that the flow path forming portion 904 can be in close contact with the second main body block 12 and the mandrel flange portion 822.

[0068] (Configuration of flow rate adjusting member) FIG. 7 shows the flow rate adjusting member 90 shown in FIG. 6, where (a) is a plan view and (b) is a cross-sectional view taken along line CC in (a) of the same figure.

[0069] 7, the flow rate adjustment member 90 has a rectangular plate shape and includes a disk-shaped flow path configuration portion 904 formed to be relatively thick in the center, and an attachment flange portion 905 provided on the periphery of the flow path configuration portion 904. That is, in the flow rate adjustment member 90, the flow path configuration portion 904 protrudes in a circular shape from both ends in the thickness direction relative to the attachment flange portion 905.

[0070] The flow path configuration section 904 has, in the center, a circular shaft through-hole 906 through which the mandrel shaft 83 can pass. The flow path configuration section 904 has a first flow path 901 provided at a position corresponding to the first vertical flow path 851a on both sides of the shaft through-hole 906, and a second flow path 902 provided at a position corresponding to the second vertical flow path 852a. Since the first flow path 901 and the second flow path 902 have the same configuration, the specific configurations of the first flow path 901 and the second flow path 902 will be described below by taking the first flow path 901 as an example.

[0071] The first flow passage 901 has an inlet-side flow passage 911 set to the same diameter as the second vertical passage 120, an outlet-side flow passage 912 set to the same diameter as the first vertical passage 851a, and a throttle flow passage 913 provided between the inlet-side flow passage 911 and the outlet-side flow passage 912 and set to a predetermined inner diameter smaller than the inlet-side flow passage 911 and the outlet-side flow passage 912. The flow passage diameters (flow passage cross-sectional areas) of the inlet-side flow passage 911 and the outlet-side flow passage 912 can be set arbitrarily according to the flow passage diameters (flow passage cross-sectional areas) of the second vertical passage 120 and the first vertical passage 851a connected thereto, respectively.

[0072] In addition, the first flow path 901 has a first tapered section 914 with a conical taper shape between the inlet side flow path 911 and the throttle flow path 913, in which the flow path diameter (flow path cross-sectional area) gradually decreases toward the throttle flow path 913 side, and has a second tapered section 915 with a conical taper shape between the throttle flow path 913 and the outlet side flow path 912, in which the flow path diameter (flow path cross-sectional area) gradually increases toward the outlet side flow path 912 side.

[0073] The mounting flange portion 905 is formed in a rectangular shape corresponding to the lower surface of the second main body block 12, and has circular bolt insertion holes 903 formed therethrough in the vicinity of each of the corners (four corners).

[0074] (Effects of this embodiment) As described above, the first flow rate adjustment member 91 and the second flow rate adjustment member according to the second embodiment may be integrated as the flow rate adjustment member 90 according to the present embodiment. By integrating them as the flow rate adjustment member 90 in this way, it is possible to easily replace the flow rate adjustment member 90 compared to the second embodiment, and it is possible to shorten the time required for the flow rate adjustment work.

[0075] 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]

[0076] 1…Die head 2…Mold clamping device 10...Branch plate (upstream component) 101...first plate side fitting portion (upstream side fitting portion) 102: Second plate side fitting portion (upstream side fitting portion) 103...Third plate side fitting portion (upstream side fitting portion) 11...First main body block (downstream member) 12...Second main body block (downstream member) 13...Third main body block (downstream member) 111...first block side fitting portion (downstream side fitting portion) 121: second block side fitting portion (downstream side fitting portion) 131...Third block side fitting portion (downstream side fitting portion) 71...First flow rate adjusting member (flow rate adjusting member) 72...Second flow rate adjusting member (flow rate adjusting member) 73...Third flow rate adjusting member (flow rate adjusting member) 721…Inlet side flow path 722...Outlet side flow path 723…Throttled channel 724…First taper section (taper section) 725…Second taper section (taper section) 90...Flow rate adjusting member 91...First flow rate adjusting member (flow rate adjusting member) 92...Second flow rate adjusting member (flow rate adjusting member) 911...Inlet side flow path 912...Outlet side flow path 913…Throttling channel 914…First taper section (taper section) 915…Second taper section (taper section) D: Molding die

Claims

1. A multi-head blow molding machine capable of molding multiple molded products in one cycle, a flow rate adjusting member that is detachably attached to a die head having a plurality of flow paths formed therein for directing molten resin material to a plurality of cavities of a molding die, and that is fixedly disposed midway along the plurality of flow paths and changes the cross-sectional area of ​​the plurality of flow paths; The flow rate adjustment member has an inlet-side flow path connected to an upstream side of the plurality of flow paths, an outlet-side flow path connected to a downstream side of the plurality of flow paths, and a throttle flow path formed between the inlet-side flow path and the outlet-side flow path and having a reduced diameter and an inner diameter smaller than the inlet-side flow path and the outlet-side flow path. A blow molding machine characterized by:

2. 2. The blow molding machine according to claim 1, the flow rate adjustment member has a tapered portion at least one of a boundary portion between the inlet side flow path and the throttle flow path and a boundary portion between the outlet side flow path and the throttle flow path, the tapered portion connecting the inlet side flow path or the outlet side flow path to the throttle flow path, A blow molding machine characterized by:

3. 2. The blow molding machine according to claim 1, The flow rate adjustment member is held in a sandwiched state between an upstream member that forms a flow path upstream of the flow rate adjustment member among the plurality of flow paths, and a downstream member that forms a flow path downstream of the flow rate adjustment member. A blow molding machine characterized by:

4. The blow molding machine according to any one of claims 1 to 3, The flow rate adjusting member is formed in a disk shape and is fitted into a circular fitting portion provided on the die head. A blow molding machine characterized by:

5. 4. The blow molding machine according to claim 3, The flow rate adjustment member is formed in a disk shape, and one axial end side is fitted into an upstream fitting portion provided on the upstream member, and the other axial end side is fitted into a downstream fitting portion provided on the downstream member, so that the flow rate adjustment member is provided across the upstream member and the downstream member. A blow molding machine characterized by:

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