JP2010064453A - Rotary type blow molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary type blow molding machine which can extremely increase production quantity of heat-resistant container per time while reducing an installation space thereof. <P>SOLUTION: The rotary type blow molding machine 10 includes a primary blow molding rotary part 20 where primary blown articles are formed by blow-molding and contracted while a plurality of primary blowing molds 22 to be heated are rotationally delivered, a secondary blow molding rotary part 30 where secondary blown articles are formed by blow-molding while a plurality of secondary blowing molds 32 are rotationally delivered, and relay rotary part 40 which delivers the primary blown articles from the primary blow molding rotary part 20 to the secondary blow molding rotary part 30 via at least one of first holding parts which are arranged between the primary blow molding rotary part and the secondary blow molding rotary part and formed on each of a plurality of relay arms 42 to be rotationally delivered. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a rotary blow molding apparatus for molding a heat-resistant container.

  There is known a rotary blow molding apparatus in which a large number of blow molds are mounted at a constant angular interval (Patent Document 1). In this apparatus, as shown in FIG. 2 of Patent Document 1, mass production of blow-molded products is possible by using a large number of blow molds (72) that are rotated and conveyed.

  On the other hand, a blow molding apparatus that mass-produces heat-resistant containers is known (Patent Document 2). As shown in FIGS. 2A and 2B of Patent Document 2, this apparatus includes a first heating station (4) for crystallizing the mouth portion of the preform and a second heating for heating the body portion of the preform to an appropriate temperature for blowing. This is a large-scale apparatus having a station (14), a primary blow molding station (17), a third heating station (24) for shrink-heating the primary blow molded product, and a secondary blow molding station (28).

As a blow molding apparatus for forming a heat-resistant container by linear conveyance, there are those shown in Patent Document 3 and Patent Document 4.
Japanese Patent Publication No. 60-45045 (Fig. 2) Japanese Patent Publication No. 4-39416 (FIGS. 2A and 2B) Japanese Patent Laying-Open No. 2003-231170 (FIG. 1) JP 2006-264035 A (FIG. 1)

  When forming a heat-resistant container by linear conveyance, the number of blow molding dies as in Patent Documents 3 and 4 cannot be arranged as in the rotary mold blow molding apparatus of Patent Document 1, and production per hour There is a limit to the number, which is not suitable for mass production. If the number of production per hour is to be increased, the number of blow molding devices can only be increased, and the occupied installation area in the factory increases.

  In addition, since linear conveyance involves acceleration and deceleration during intermittent conveyance of a molded product, the molded product may be tilted and misaligned during conveyance (see 0006 of Patent Document 4). For this reason, in the technique of Patent Document 4, measures are taken to prevent misalignment of the primary blow molded product during the secondary blow molding.

  On the other hand, a large-scale apparatus as shown in Patent Document 2 has the same problem in terms of the occupied installation area, and the apparatus becomes complicated.

  An object of the present invention is to provide a rotary type blow molding apparatus capable of extremely increasing the production amount of heat-resistant containers per hour while reducing the occupied installation area.

A rotary blow molding apparatus according to an aspect of the present invention is
While rotating and conveying a plurality of primary blow molds to be heated, a preform is blow-molded into a primary blow-molded product with each of the plurality of primary blow molds, and the primary with each of the plurality of primary blow molds A primary blow molding rotary part for shrinking the blow molded product;
A secondary blow molding rotary part that blow-molds the primary blow-molded product into a secondary blow-molded product in each of the plurality of secondary blow dies while rotating and conveying a plurality of secondary blow dies;
The secondary blow molding rotary part is arranged between the primary blow molding rotary part and the secondary blow molding rotary part through at least one first holding part provided in each of a plurality of relay arms to be rotated and conveyed. A relay rotary part that delivers the primary blow-molded product to the molding rotary part;
It is characterized by having.

  According to one aspect of the present invention, a primary blow-molded product is obtained by performing primary blow in a primary blow mold heated in a primary blow-molding rotary section. The primary blow-molded product blow-molded in the primary blow mold is in close contact with the cavity surface of the primary blow mold where the outer surface is heated by blow air. Will be. In the secondary blow molding rotary part, the primary blow molded product which is contracted and softened is secondarily blown in the secondary blow mold and re-expanded to obtain a secondary blow molded product which is the final product. Thereby, a heat-resistant container can be shape | molded.

  Further, according to one aspect of the present invention, conveyance between the primary / secondary blow-molded rotary part can be realized only by the relay rotary part. The relay rotary part receives the primary blow molded product directly from the primary blow mold rotated and conveyed by the primary blow molding rotary part via the first holding part provided on the relay arm to be rotated and rotated by a predetermined rotation angle. The primary blow-molded product can be directly delivered to the secondary blow mold that is conveyed and rotated and conveyed by the secondary blow molding rotary unit. In this way, production of heat-resistant containers per hour according to the number of blow molds provided in the primary / secondary blow molding rotary part while reducing the occupied installation area by the primary / secondary blow molding rotary part and the relay rotary part The amount can be increased. In addition, the primary / secondary blow molding rotary part and the relay rotary part are continuously rotated in one direction at a low speed, so that large acceleration / deceleration does not act on the molded product as in linear conveyance, preventing bending and falling of the molded product. As a result, molding characteristics are improved.

  In one aspect of the present invention, a circle defined by a first rotation center of the primary blow molding rotary part and a first diameter D1 is a rotation locus of the primary blow molding rotary part in the primary blow molding rotary part. A second circle is a rotation locus of the secondary blow center in the secondary blow molding rotary portion, which is defined by the second rotation center of the secondary blow molding rotary portion and the second diameter D2. D1> D3 and D2> when the upper circle is defined by the third rotation center of the relay rotary portion and the third diameter D3, and the circle in contact with the first circle and the second circle is the third circle. D3.

  In other words, the third diameter D3 of the relay rotary part is smaller than the diameters D1 and D2 of the conveyance trajectories of the primary / secondary blow-molded rotary part that performs the actual processing. Since the relay rotary part only conveys the primary blow-molded product, the rotary blow molding apparatus can be reduced in size with the minimum required diameter D3. Note that the third circle receives the primary blow-molded product between the position where the relay rotary portion receives the primary blow-molded product with the primary blow-molded rotary portion and the relay rotary portion with the secondary blow-molded rotary portion 40. This is a virtual transport locus that passes through at least two points with the handing position. However, since the conveyance locus of the relay rotary portion does not need to protrude beyond the third circle, the third circle can be said to be the conveyance locus of the maximum diameter.

  In one embodiment of the present invention, D1 = D2. The first diameter D1 and the second diameter D2 do not necessarily coincide with each other, but in an apparatus in which the primary / secondary blow-molded rotary part is essential, the component parts of the primary / secondary blow-molded rotary part by D1 = D2 Most can be shared.

  In one aspect of the present invention, the third rotation center can be arranged at a position shifted to one side with respect to the first straight line passing through the first rotation center and the second rotation center.

  Although the third rotation center may be arranged on the first straight line, the distance between the first and third rotation centers is L = D3 + (D1 + D2) / 2, whereas in this embodiment, L <D3 + (D1 + D2) / 2, and considering the reduction of the diameter D3 as described above, the overall size of the apparatus can be reduced as the distance L is shortened.

  In one aspect of the present invention, the primary and secondary blow-molded rotary parts can rotate in a first direction, and the relay rotary part can rotate in a second direction opposite to the first direction.

  By making each rotation direction as described above and shifting the third rotation center, there is an effect that the dead angle of the primary / secondary blow molding rotary part can be reduced.

In one aspect of the present invention, the apparatus further includes a supply rotary part that supplies the preform to the primary blow molding rotary part via at least one second holding part provided in each of the plurality of supply arms that are rotated and conveyed. And
The fourth rotation center of the supply rotary portion may be arranged at a position that is largely shifted to the one side relative to the position of the third rotation center with respect to the first straight line.

  In this way, the supply rotary part can be arranged at the upstream position in the rotation direction and the relay rotary part can be arranged at the downstream position, and a large effective processing angle from the supply rotary part to the relay rotary part can be ensured, and the supply rotary part can be supplied from the relay rotary part. The dead angle leading to the part can be reduced.

In one aspect of the present invention, the take-out rotary part for taking out the secondary blow-molded product from the secondary blow-molded rotary part via at least one third holding part provided in each of the plurality of take-out arms that are rotated and conveyed. Further comprising
The fifth rotation center of the take-out rotary part can be arranged at a position that is largely shifted to the one side relative to the position of the third rotation center with respect to the first straight line.

  In this way, the take-out rotary part can be arranged at the upstream position in the rotation direction and the relay rotary part can be arranged at the downstream position, and a large effective processing angle from the relay rotary part to the take-out rotary part can be secured, and the take-off rotary part can be relayed to the relay rotary part. The dead angle leading to the part can be reduced.

  The relay rotary part has a plurality of first holding parts in each of the plurality of relay arms, and receives a plurality of primary blow-molded products from the primary blow-molded rotary part simultaneously by the plurality of first holding parts, The plurality of primary blow molded articles can be simultaneously delivered to the secondary blow molded rotary part.

  In this way, the primary blow molding rotary part can delay the timing of opening the primary blow mold in order to deliver the primary blow molded product to the relay rotary part as compared with the case where the primary molded article is delivered one by one. The dead angle in the primary blow molding rotary part can be reduced. Similarly, in the secondary blow molding rotary part, it is possible to accelerate the timing until the mold opening of the secondary blow mold is maintained in order to receive the primary blow molded product from the relay rotary part. The dead angle can be reduced.

  In one aspect of the present invention, the supply rotary portion has a plurality of second holding portions in each of the plurality of supply arms, and the plurality of preforms are simultaneously molded into the primary blow molding by the plurality of second holding portions. Can be passed to the rotary part.

  In this way, compared with the case where the preforms are delivered one by one, the primary blow molding rotary part can advance the timing until the primary blow mold opening is maintained in order to receive the preforms from the supply rotary part. The dead angle in the primary blow molding rotary part can be reduced.

  In one aspect of the present invention, the plurality of second holding units may be supplied with the preforms one by one. This is because whether the plurality of preforms are supplied to the supply rotary part simultaneously or one by one is irrelevant to the dead angle of the primary blow molding rotary part.

  In one aspect of the present invention, the take-out rotary part has a plurality of third holding parts in each of the plurality of take-out arms, and a plurality of secondary blow-molded articles are simultaneously formed by the plurality of third holding parts. It can be received from the secondary blow molding rotary part.

  In this way, the secondary blow molding rotary part can delay the timing of opening the secondary blow mold in order to deliver the secondary blow molded product to the take-out rotary part, and the dead angle at the secondary blow molding rotary part can be increased. Can be small.

  In one aspect of the present invention, the secondary blow molded products can be discharged one by one from the plurality of third holding portions. This is because whether a plurality of secondary blow-molded products are discharged from the take-out rotary portion at the same time or one by one is independent of the dead angle of the secondary blow-molded rotary portion.

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

(Basic configuration of rotary blow molding equipment)
FIG. 1 is a plan view showing an overall configuration of a rotary blow molding apparatus 10 according to the present embodiment. The apparatus 10 has a primary blow molding rotary part 20, a secondary blow molding rotary part 30, and a relay rotary part 40 on a machine base 12.

  The primary blow molding rotary unit 20 blow-molds a preform into a primary blow molded product with each of the L primary blow dies 22 while rotating and conveying a plurality of heated primary blow dies 22, for example L = 12. In addition, the primary blow-molded product is contracted by each of the L primary blow dies 22.

  The secondary blow molding rotary part 30 turns the primary blow molded product into a secondary blow molded product in each of the M secondary blow molds 32 while rotating and conveying a plurality of, for example, M = 12 secondary blow molds 32. Blow molding.

  The relay rotary part 40 is disposed between the primary and secondary blow molding rotary parts 20 and 30. The relay rotary part 40 is connected to the secondary blow-molded rotary part 20 from the primary blow-molded rotary part 20 via at least one first holding part 44 provided on each of a plurality of, for example, N = 6 relay arms 42 that are rotated and conveyed. The primary blow-molded product is delivered to the unit 30.

  Here, at least one primary blow cavity 22 </ b> A is formed in the primary blow mold 22, but in this embodiment, three primary blow cavities 22 </ b> A are formed in one primary blow mold 22. Therefore, three primary blow-molded products are simultaneously molded by one primary blow mold 22. As the primary blow molding rotary portion 20, 12 × 3 = 36 primary blow cavities 22A are mounted.

  The secondary blow mold 32 is also formed with three secondary blow cavities 32 </ b> A, which is the same number as the primary blow mold 22. Therefore, three secondary blow-molded products are simultaneously molded by one secondary blow mold 32. As the secondary blow molding rotary part 30, 12 × 3 = 36 secondary blow cavities 32A are mounted.

  A primary blow-molded product is obtained by performing a primary blow using a high-pressure air and a stretch rod in a primary blow mold 22 that is preheated to a suitable temperature for stretching in the primary blow molding rotary unit 20. can get. The primary blow-molded product blow-molded in the primary blow mold 22 is brought into close contact with the cavity surface of the primary blow mold 22 whose outer surface is heated by high-pressure blow air. The part will heat shrink.

  In the secondary blow molding rotary section 30, the primary blow molded product that is contracted and softened is secondarily blown only by high-pressure air in the secondary blow mold 32 and re-expanded, and the secondary blow molded product is the final product. A molded product is obtained.

  Forming a heat-resistant container using such a process is known in a linear conveyance type blow molding apparatus, but only a large-scale apparatus according to Patent Document 2 is known as a rotary type blow molding apparatus.

  In the present embodiment, conveyance between the primary / secondary blow-molded rotary parts 20 and 30 is realized only by the relay rotary part 40. That is, the relay rotary unit 40 receives the primary blow molded product directly from the primary blow mold 22 rotated and conveyed by the primary blow molding rotary unit 20 via the relay arm 42 that is rotated and conveyed, and is rotated and conveyed by a predetermined rotation angle. Thus, the primary blow molded product can be directly delivered to the secondary blow mold 32 rotated and conveyed by the secondary blow molding rotary unit 30.

(Layout of rotary blow molding equipment)
A rotation trajectory of the primary blow center (center of the primary blow cavity 22A) P1 in the primary blow molding rotary part 20, which is a circle defined by the first rotation center O1 of the primary blow molding rotary part 20 and the first diameter D1. Is defined as the first circle C1. This is a rotation locus of the secondary blow center (center of the secondary blow cavity 32) P2 in the secondary blow molding rotary part 30, and is the second rotation center O2 of the secondary blow molding rotary part 30 and the second diameter D2. The defined circle is defined as the second circle C2. Furthermore, a circle defined by the third rotation center O3 and the third diameter D3 of the relay rotary unit 40 and in contact with the first circle C1 and the second circle C2 is defined as a third circle C3. Here, the third circle C3 is primary between the position where the relay rotary unit 40 receives the primary blow-molded product with the primary blow-molded rotary unit 20 and the relay rotary unit 40 with the secondary blow-molded rotary unit 30. It is the virtual conveyance locus | trajectory which passes along 2 points | pieces with the position which delivers a blow molded product. However, as will be described later, since the relay arm 42 advances and retreats in the radial direction, the actual transport locus of the relay rotary unit 40 does not coincide with the third circle C3. In addition, since the conveyance locus | trajectory of the relay rotary part 40 does not need to protrude rather than a 3rd circle, it can be said that a 3rd circle is a largest conveyance locus | trajectory.

  Here, in this embodiment, D1> D3 and D2> D3 are established. That is, the third diameter D3 of the relay rotary unit 40 is smaller than the diameters D1 and D2 of the conveyance trajectories of the primary / secondary blow-molded rotary units 20 and 30 that perform the actual processing. Since the relay rotary unit 40 only conveys the primary blow-molded product, the rotary blow molding device 10 is reduced in size as the minimum necessary diameter D3.

  In the present embodiment, D1 = D2 holds. The first diameter D1 and the second diameter D2 do not necessarily need to coincide with each other. However, in an apparatus in which the primary / secondary blow-molded rotary parts 20 and 30 are indispensable as in the present embodiment, the primary and secondary diameters are set by D1 = D2. Most of the components of the next blow-molded rotary parts 20 and 30 can be made common. This is because the primary / secondary blow molding rotary parts 20, 30 are different from the primary / secondary blow molds 22, 32, and the parts of the rotary conveyance system of the mold are made common by setting D1 = D2.

  In the present embodiment, as shown in FIG. 1, the third rotation center O3 is located at a position shifted to one side on the arrow D side with respect to the first straight line S1 passing through the first rotation center O1 and the second rotation center O2. Arranged. Although the third rotation center O3 may be arranged on the first straight line S1, the distance between the first and third rotation centers O1 and O2 is L = D3 + (D1 + D2) / 2. In this embodiment, L <D3 + (D1 + D2) / 2, and when the diameter D3 is reduced as described above, the entire apparatus can be downsized as the distance L is shortened. In addition, the following can be said by setting the third rotation center O3 described above.

  First, in the present embodiment, the primary blow molding rotary part 20 is in the rotational direction A, the relay rotary part 40 is in the rotational direction B, the secondary blow molding rotary part 30 is in the rotational direction C, and the rotational directions A and C are the same direction (see FIG. 1 is the counterclockwise direction), and the rotation direction B is the reverse direction (clockwise direction in FIG. 1). Although it is not always necessary to set each rotation direction as described above, the dead angles of the primary / secondary blow-molded rotary parts 20 and 30 can be set by shifting each rotation direction as described above and shifting the third rotation center O3. There is an effect that can be reduced.

  Here, the dead angle is a rotation angle at which the primary blow mold 22 or the secondary blow mold 32 is opened at the primary / secondary blow molding rotary parts 20 and 30 and does not contribute to the primary / secondary blow molding. It is.

  The position where the primary blow molded product is delivered from the primary blow molding rotary portion 20 to the relay rotary portion 40 is located on the second straight line S2 connecting the first and third rotation centers O1 and O3, and the primary blow mold 22 and the relay arm 42. Is when they face each other. At this time, the primary blow mold 22 must be opened.

  When the third rotation center O3 is arranged on the first straight line S1, the delivery is performed when the primary blow mold 22 and the relay arm 42 face each other on the first straight line S1, but in the present embodiment, the first straight line The second straight line S2 on the downstream side in the rotation direction A with respect to S1 is the delivery position. As a result, the start of the dead angle can be delayed, and as a result, the dead angle can be reduced.

  In the secondary blow molding rotary part 30, when the third rotation center O3 is arranged on the first straight line S1, the delivery is performed when the secondary blow mold 32 and the relay arm 42 face each other on the first straight line S1. However, in the present embodiment, the delivery position is on the third straight line (straight line connecting the second and third rotation centers O2 and O3) S3 upstream in the rotation direction C with respect to the first straight line S1. Thereby, the end of the dead angle can be accelerated, and as a result, the dead angle can be reduced.

  In the present embodiment, a supply rotary unit 50 and a take-out rotary unit 60 are further provided on the machine base 12. The supply rotary unit 50 has a plurality of, for example, four supply arms 52 that are rotated and conveyed. Each of the four supply arms 52 supplies the preform to the primary blow-molding rotary part 20 via the second holding part 54 that holds at least one, for example, three preforms.

  The take-out rotary unit 60 has a plurality of, for example, three take-out arms 62 that are rotated and conveyed. Each of the three take-out arms 62 takes out the secondary blow-molded product from the secondary blow-molded rotary portion 30 via the third holding portion 64 that holds at least one, for example, three secondary blow-molded products.

  Here, the fourth rotation center O4 of the supply rotary unit 50 and the fifth rotation center O5 of the take-out rotary unit 60 are largely shifted in the arrow D direction with respect to the first straight line S1 than the position of the third rotation center O3. Placed in position.

  Accordingly, the supply rotary unit 50 is upstream of the delivery position (on the second straight line S2) between the primary blow molding rotary unit 20 and the relay rotary unit 40 in the rotation direction A of the primary blow molding rotary unit 20. On the side, a preform can be supplied. In addition, a large effective processing angle from the supply rotary unit 50 to the relay rotary unit 40 can be secured, and the dead angle θ1 from the relay rotary unit 40 to the supply rotary unit 50 can be reduced.

  The position where the supply rotary unit 50 supplies the preform to the primary blow molding rotary unit 20 is on a fourth straight line S4 connecting the first and fourth rotation centers O1 and O4. That is, the primary blow mold 22 and the supply arm 52 are in a directly facing position. In this position, three preforms are fed simultaneously. Therefore, the angle θ1 formed by the two straight lines S1 and S4 corresponds to a dead angle that is a rotation angle at which the primary blow mold 22 is at least opened. Actually, the primary blow mold 22 is opened on the upstream side of the first straight line S1, and the mold is closed on the downstream side of the fourth straight line S4. Therefore, the actual dead angle is determined from the angle θ1. Is also a wide angle.

  Similarly, the take-out rotary part 60 is from a delivery position (on the third straight line S3) between the secondary blow molding rotary part 30 and the relay rotary part 40 in the rotation direction C of the secondary blow molding rotary part 30. Also, the secondary blow molded product can be taken out at the downstream side. In addition, a large effective processing angle from the relay rotary unit 40 to the take-out rotary unit 60 can be secured, and the dead angle θ2 from the take-out rotary unit 60 to the relay rotary unit 40 can be reduced.

  The position where the take-out rotary part 60 takes out the secondary blow-molded product from the secondary blow-molded rotary part 30 is on the fifth straight line S5 connecting the second and fifth rotation centers O2 and O5. That is, it is the position where the secondary blow mold 32 and the take-out arm 62 face each other. At this position, three secondary blow-molded products are taken out simultaneously. Therefore, the angle θ2 formed by the two straight lines S3 and S5 corresponds to a dead angle that is a rotation angle at which the secondary blow mold 32 is at least opened. Actually, the secondary blow mold 32 is opened on the upstream side of the fifth straight line S5, and the mold is closed on the downstream side of the third straight line S3. Therefore, the actual dead angle is the angle θ2. Wider angle.

  In the present embodiment, a preform heating device 70 can be further provided on the upstream side of the supply rotary unit 50. This preform heating device 70 is for adjusting the temperature of the preform to a suitable temperature for blowing.

  The preform heating device 70 spans the chain 74 between the two sprockets 72 </ b> A and 72 </ b> B, and supports and transports the preform on a plurality of transportation platforms attached to the chain 74. The preform body can be heated by arranging a heater on one side of the both sides of the preform conveyance path and a reflecting mirror on the other side. Although not shown in the drawings, the preform rotates in the heating region, and the preform is uniformly heated in the circumferential direction.

  A shooter 80 and a first supply wheel 82 are provided further upstream of the preform heating device 70. The preforms that have slipped down the shooter 80 are supplied to the preform heating device one by one by the first supply wheel 82.

  Second and third supply wheels 84 and 86 are provided on the downstream side of the preform heating device 70. Preforms heated by the preform heating device 70 are taken out one by one by the second supply wheel 84, conveyed by a predetermined rotation angle, and delivered to the third supply wheel 86. The third supply wheel 86 conveys the delivered preforms by a predetermined rotation angle, and delivers them one by one to the supply rotary unit 50. At this time, there is one second holding portion 54 of the supply rotary unit 50 on a straight line (not shown) passing through the fourth rotation center O4 of the supply rotary unit 50 and the sixth rotation center O6 of the third supply wheel 86. When they are arranged one by one, the preforms are delivered to the supply rotary unit 50 one by one.

  On the other hand, a first take-out wheel 90, a second take-out wheel 92, and a take-out rail 94 are disposed on the downstream side of the take-out rotary unit 60. The secondary blow-molded products are delivered to the first take-out wheel 90 one by one from the take-out rotary part 60 and discharged to the take-out rail 94 through the second take-out wheel 92. At this time, there is one third holding portion 64 of the take-out rotary portion 60 on a straight line (not shown) passing through the fifth rotation center O5 of the take-out rotary portion 60 and the seventh rotation center O7 of the first take-out wheel 90. When they are arranged one by one, the secondary blow-molded products are taken out one by one from the take-out rotary part 60. The operation of discharging the secondary blow molded products one by one from the take-out rotary unit 60 is performed in the same manner as the preform supply operation to the supply rotary unit 50.

(Rotary molded product conveyor)
FIGS. 2 and 3 are a plan view and a longitudinal sectional view of a rotary molded product conveying apparatus 100 having a structure common to the relay rotary unit 40, the supply rotary unit 50, and the take-out rotary unit 60. 2 and 3, only one transfer arm 110 is illustrated. However, the necessary number of transfer arms 110 may be set according to the applications such as the relay rotary unit 40, the supply rotary unit 50, and the take-out rotary unit 60. They can be arranged at angular intervals.

  2 and 3, the rotary molded product conveyance device 100 includes a rotating shaft 104 that is rotatably supported by a bearing portion 122. A rotating plate 120 is fixed to the rotating shaft 104. The first cam plate 130 is fixed to the bearing portion 122 in parallel with the rotating plate 120 on one surface side, for example, the upper side of the rotating plate 120. A second cam plate 140 is provided in parallel to the rotating plate 120 on the other surface side, for example, the lower side, of the rotating plate 120. The first and second cam plates 130 and 140 are fixedly arranged without rotating together with the rotating shaft 104.

  For example, a first cam 132 formed by a cam groove is continuously provided in the circumferential direction on the lower surface of the first cam plate 130. Similarly, on the upper surface of the second cam plate 140, for example, a second cam 142 formed by a cam groove is provided continuously in the circumferential direction.

  As shown in FIGS. 2 to 7, a rotation arm 150 is rotatably provided on the free end side of the transfer arm 110. The rotating arm 150 is provided with at least one, for example, three holding portions 160 protruding in a direction orthogonal to the direction in which the rotating arm 150 extends (longitudinal direction of the rotating arm 150). The holding part 160 functions as a grip member that can be opened and closed, and can hold a mouth part common to a preform, a primary blow-molded product, or a secondary blow-molded product. The molded products held by the three holding units 160 are held side by side from the upstream side to the downstream side in the rotational conveyance direction of the rotary molded product conveyance device.

  One end of the rotary arm 150 is rotatably provided, and a control arm 170 that controls the crossing angle of the rotary arm 150 with respect to the transfer arm 110 is provided. The proximal end side of the transfer arm 110 and the other end of the control arm 170 are rotatably supported by the connecting member 118, respectively. As will be described later, the connecting member 118 is rotatably supported by the rotating plate 120. The transport arm 110, the connecting member 118, the rotation arm 150, and the control arm 170 form a four-node parallel rotation link.

  In the present embodiment, as shown in FIG. 3, a shaft portion 112 fixed to the proximal end side of the transfer arm 110 is provided, and the shaft portion 112 is supported by a bearing portion 122 disposed on the rotating plate 120. Thus, the rotary plate 120 is rotatably supported. 4 to 7, the bearing 122 is illustrated, but the rotating plate 120 is omitted.

  As shown in FIGS. 4 to 7, a fixing member 114 is fixed to one end side, for example, the upper end side, of the shaft portion 112. The fixing member 114 has a first cam follower 116 guided by the first cam 132 (FIG. 3) at a position away from the center of the shaft portion 112. The first cam follower 116 can be constituted by a roller or the like that is rotatably supported by the fixed member 114.

As shown in FIGS. 4 to 7, a connecting member 118 that is rotatably supported is provided on the other end side, for example, the lower side, of the shaft portion 112. A second cam follower 119 guided by the second cam 142 (FIG. 3) is provided at a position away from the center of the shaft portion 112 of the connecting member 118. The second cam follower 119 can also be composed of a roller that is pivotally supported by the connecting member 118 and is rotatable. The control arm 170 is rotatably supported by the connecting member 118 at a position opposite to the second cam follower 119 with the shaft portion 112 interposed therebetween (operation of the rotary molded product conveying device).
The rotary type molded product conveying apparatus 100 includes two units that rotate and convey at least one molded product at each of a plurality of positions at equiangular intervals around each rotation center, and deliver at least one molded product. One of them is applied to the rotary type molded article conveying apparatus. In the embodiment of FIG. 1, each of the relay rotary unit 40, the supply rotary unit 50, and the take-out rotary unit 60 can be configured by a rotary mold product conveying device 100.

  The rotary molded product conveyance device 100 holds the mouth of the preform, the primary molded product, or the secondary molded product by, for example, three holding units 160 provided on the conveyance arm 110 and rotates the rotation shaft 104 to rotate the rotation shaft. It can be rotated and conveyed around 104. At this time, the rotation position of the transport arm 110 is controlled by the first cam follower 116 that engages with the first cam 132. Further, the control arm 170 is driven by the second cam follower 119 engaged with the second cam 142, and the intersection angle of the rotation arm 150 with respect to the transport arm 110 is controlled.

  In particular, the rotary molded article conveying apparatus 100 is characterized by control at the delivery position. This will be described with reference to FIGS. 8 to 10 show an application of the rotary molded product conveying apparatus 100 to the supply rotary unit 50 shown in FIG. FIG. 8 shows the rotational position immediately before delivering the preform from the supply rotary unit 50 (100) to the primary blow mold 22 that is rotated and conveyed in the direction of arrow A around the first rotation center O1 of FIG. . FIG. 9 shows the rotational position at which the preform is transferred from the supply rotary unit 50 (100) to the primary blow mold 22. FIG. 10 shows the rotational position immediately after the preform is delivered from the supply rotary unit 50 (100) to the primary blow mold 22.

  8 to 10 show delivery positions when the transfer arm 110 is arranged along a straight line S4 passing through the first rotation center O1 of the primary blow molding rotary part 20 and the fourth rotation center O4 of the supply rotary part 50 (see FIG. 8). 9) Over a predetermined rotation angle centered on 9) (FIGS. 8 to 10), in a direction parallel to the straight line S4 in a horizontal plane, at least one, for example, three holding portions 160 are reciprocated by a stroke that can be delivered, In addition, the three holding portions 160 are opposed to at least one of the primary blow molds 22 of the primary blow molding rotary portion 20, for example, three primary blow cavities 22A (see FIG. 8).

  Here, “directly facing” means a state in which the three primary blow cavities 22A and the three holding portions 160 face each other directly opposite each other, as shown in FIGS. In order to make it face up in this way, in any case of FIGS. 8 to 10, the posture in which the half parting surface 22 </ b> B of the opened primary blow mold 22 and the connecting member 118 are parallel is maintained. It is necessary.

  Compared with FIGS. 8 and 10, the three holding portions 160 protrude most outward in the radial direction at the transfer position in FIG. 9. Thereby, three primary blow-molded articles can be simultaneously delivered between the three holding parts 160 and the three primary blow cavities 22A. For this purpose, the transfer arm 110 may be moved forward by a predetermined stroke amount in a direction parallel to the straight line S4 of FIG. 9 during the rotation from FIG. 8 to FIG. Conversely, during the rotation from FIG. 9 to FIG. 10, the transport arm 110 may be moved backward by a predetermined stroke amount in a direction parallel to the straight line S4 of FIG.

  The first and second cam followers 116 and 119 engaged with the first and second cams 132 and 142 are achieved by controlling the postures of the transfer arm 110 and the control arm 170 shown in FIGS. .

  The technical significance of maintaining “facing” in the predetermined angle range in this way is that the primary blow-molded product is not rotated in the three holding portions 160 during the delivery process leading to FIGS. That is. Therefore, the mouth portion of the molded product is not damaged by the holding portion 160, and the appearance of the product can be improved. Such actions and effects can be obtained in the same way when the rotary molded article conveying apparatus 100 is applied to the take-out rotary section 60 shown in FIG.

  When the rotary type molded product conveying apparatus 100 is applied to the relay rotary unit 40 shown in FIG. 1, the following great effects can be achieved in addition to the above-described prevention of damage to the mouth of the molded product. This effect is that the position of the parting line appearing in the primary blow-molded product in the primary blow-molding process coincides with the position of the parting line appearing in the secondary blow-molded product. This significantly improves the appearance quality of the heat-resistant container as the final product. This additional effect is also caused by the fact that the primary blow molded product does not rotate in the holding portion 160 when the primary blow molded product is transferred from the primary blow molded rotary portion 20 to the secondary blow molded rotary portion 30. .

  Furthermore, when the rotary molded product conveying apparatus 100 is applied to both the relay rotary unit 40 and the supply rotary unit 50 shown in FIG. 1, the dead angle of the primary blow-molded rotary unit 20 can be further reduced. This effect can be achieved when a plurality of holding portions 160 are arranged on one transfer arm 110 and delivered simultaneously. When three preforms or three primary blow-molded articles are delivered simultaneously, at least the angle θ1 shown in FIG. 1 is the dead angle of the primary blow-molded rotary part 20. As shown in FIG. 8, when the holding part 160 at the center position among the three holding parts 160 is arranged on a straight line S4 passing through the two rotation centers O1 and O4, the delivery position is set. Therefore, in FIG. 1, at least the primary blow mold is opened between the first delivery position on the straight line S1 and the second delivery position on the straight line S4.

  As a comparative example, one in which a molded product is delivered one by one using three transfer arms 110 between the three primary blow cavities 22A of the primary blow mold 22 can be cited. In this comparative example, the primary blow mold 22 has to be opened when the primary blow cavity 22A of the three conveying positions of the primary blow mold 22 reaches the straight line S1 in FIG. On the other hand, in the present embodiment, it is only necessary that the primary blow mold 22 is opened when the primary blow cavity 22A at the center position among the three primary blow molds 22 reaches the straight line S1 in FIG. For this reason, the mold opening timing can be delayed by one pitch of adjacent cavities.

  In the comparative example, the mold opening of the primary blow mold 22 must be maintained until the primary blow cavity 22A of the three rear blow end positions of the primary blow mold 22 reaches the straight line S1 in FIG. On the other hand, in the present embodiment, it is only necessary that the primary blow mold 22 is kept open until the primary blow cavity 22A at the center position among the three primary blow molds 22 reaches the straight line S1 in FIG. For this reason, the mold closing timing can be advanced by one pitch of adjacent cavities. Thus, the dead angle in the primary blow molding rotary part 20 can be reduced.

  Similarly, if the rotary molded product conveying apparatus 100 is applied to both the relay rotary unit 40 and the take-out rotary unit 60 shown in FIG. 1, it is possible to take measures against the dead angle of the secondary blow-molded rotary unit 30.

(Blow type)
FIG. 11 and FIG. 12 show a mold clamping state and a mold opening state of a primary blow mold 22 for blow-molding a preform 180 into a primary blow molded product 190, for example, as a blow mold used in the present embodiment. . The primary blow mold 22 has a second half cavity mold 210 that is driven to open and close by a link mechanism 220 with respect to the fixed first half cavity mold 200. This opening and closing method is called a so-called alligator type opening and closing.

  In the present embodiment, at least the mold opening state shown in FIG. 12 is set between the dead angles θ1 of FIG. Thus, the preform 180 or the primary blow molded product 190 can be delivered without the interference between the first holding part 44 of the relay rotary part 40 and the second holding part 54 of the supply rotary part 50 and the primary blow mold 22. it can.

  Although the present embodiment has been described in detail as described above, those skilled in the art can easily understand that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, a term described together with a different term having a broader meaning or the same meaning at least once in the specification or the drawings can be replaced with the different term anywhere in the specification or the drawings.

It is a top view of the rotary type blow molding apparatus concerning one mode of the present invention. It is a top view of the supply rotary part shown in FIG. It is a longitudinal cross-sectional view of a supply rotary part. It is a perspective view of a supply arm. It is a top view of a supply arm. It is a bottom view of a supply arm. It is a rear view of a supply arm. It is a figure which shows the rotation state just before the receiving position where three blow cavities and three holding parts oppose. It is a figure which shows the rotation state in the receiving position where three blow cavities and three holding parts oppose. It is a figure which shows the rotation state immediately after the receiving position where three blow cavities and three holding parts oppose. It is a side view which shows the mold clamping state of a blow mold. It is a side view which shows the mold open state of a blow mold.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Rotary type blow molding apparatus, 12 units, 20 Primary blow molding rotary part, 22 Primary blow mold, 22A Primary blow cavity, 30 Secondary blow molding rotary part, 32 Secondary blow mold, 32A Secondary blow cavity, 40 Relay Rotary section, 42 Relay arm, 44 First holding section, 50 Supply rotary section, 52 Supply arm, 54 Second holding section, 60 Extraction rotary section, 62 Extraction arm, 64 Third holding section, 70 Preform heating device, 72A , 72B Sprocket, 74 Chain, 80 Shuter, 82 First supply wheel, 84 Second supply wheel, 86 Third supply wheel, 90 First take-out wheel, 92 Second take-out wheel, 94 Take-out rail, 100 Rotary mold product conveyance Device, 110 transfer arm, 1 18 connecting member, 120 rotating plate, 130 first cam plate, 140 second cam plate, 150 rotating arm, 170 control arm, 180 preform, 190 primary blow molded product, 200 first half cavity mold, 210 first 2 half cavity type, 220 link mechanism

Claims (12)

While rotating and conveying a plurality of primary blow molds to be heated, a preform is blow-molded into a primary blow-molded product with each of the plurality of primary blow molds, and the primary with each of the plurality of primary blow molds A primary blow molding rotary part for shrinking the blow molded product;
A secondary blow molding rotary part that blow-molds the primary blow-molded product into a secondary blow-molded product in each of the plurality of secondary blow dies while rotating and conveying a plurality of secondary blow dies;
The secondary blow molding rotary part is arranged between the primary blow molding rotary part and the secondary blow molding rotary part through at least one first holding part provided in each of a plurality of relay arms to be rotated and conveyed. A relay rotary part that delivers the primary blow-molded product to the molding rotary part;
A rotary blow molding apparatus characterized by comprising: In claim 1,
A rotation trajectory of the primary blow center in the primary blow molding rotary portion, which is defined by the first rotation center of the primary blow molding rotary portion and the first diameter D1, is defined as a first circle, and the secondary blow center A rotation trajectory of the secondary blow center in the molding rotary portion, a circle defined by the second rotation center of the secondary blow molding rotary portion and the second diameter D2 is defined as a second circle, and the relay rotary portion D1> D3 and D2> D3 are satisfied when a circle defined by a third rotation center and a third diameter D3 and in contact with the first circle and the second circle is a third circle. Rotary type blow molding equipment. In claim 2,
A rotary blow molding apparatus characterized in that D1 = D2. In claim 2 or 3,
The rotary molding apparatus, wherein the third rotation center is arranged at a position shifted to one side with respect to a first straight line passing through the first rotation center and the second rotation center. In claim 4,
The rotary blow molding apparatus according to claim 1, wherein the primary and secondary blow molding rotary parts rotate in a first direction, and the relay rotary part rotates in a second direction opposite to the first direction. In claim 5,
A feed rotary part for feeding the preform to the primary blow molding rotary part via at least one second holding part provided in each of the plurality of feed arms to be rotated and conveyed;
The rotary blow molding apparatus according to claim 4, wherein a fourth rotation center of the supply rotary portion is disposed at a position that is largely shifted to the one side with respect to the first straight line from a position of the third rotation center. In claim 6,
Further including a take-out rotary part for taking out the secondary blow-molded product from the secondary blow-molded rotary part via at least one third holding part provided in each of the plurality of take-out arms to be rotated and conveyed;
The rotary blow molding apparatus according to claim 5, wherein the fifth rotation center of the take-out rotary part is arranged at a position that is largely shifted to the one side with respect to the first straight line with respect to the position of the third rotation center. In any one of Claims 1 thru | or 7,
The relay rotary part has a plurality of first holding parts in each of the plurality of relay arms, and receives a plurality of primary blow-molded products from the primary blow-molded rotary part simultaneously by the plurality of first holding parts, The rotary type blow molding apparatus, wherein the plurality of primary blow molded products are simultaneously delivered to the secondary blow molding rotary part. In any of claims 5 to 8,
The supply rotary part has a plurality of second holding parts in each of the plurality of supply arms, and the plurality of second holding parts simultaneously deliver a plurality of preforms to the primary blow molding rotary part. A rotary blow molding device characterized. In claim 9,
The rotary blow molding apparatus, wherein the preforms are supplied to the plurality of second holding portions one by one. In any of claims 6 to 10,
The take-out rotary part has a plurality of third holding parts in each of the take-out arms, and a plurality of secondary blow-molded products are simultaneously delivered from the secondary blow-molded rotary part by the plurality of third hold parts. A rotary blow molding apparatus characterized by receiving. In claim 11,
The rotary blow molding apparatus, wherein the secondary blow molded products are discharged one by one from the plurality of third holding portions.

Images