JP3875816B2 - Preform heat transfer mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention is a preform heating conveyancemechanismAnd, in particular, a preform heating / conveying device that simultaneously conveys a plurality of preforms.mechanismAnd a heating conveying member.
[0002]
[Background Art and Problems to be Solved by the Invention]
In general, a blow molding machine for forming a thin packaging container made of a synthetic resin called a biaxially stretched blow container is known.
[0003]
When molding such a synthetic resin container, for example, a PET container, the preform may be heated to a suitable temperature for blow molding in advance.
[0004]
For example, the present applicant has previously proposed a blow molding machine having a preform heating station as disclosed in JP-A-10-264240.
[0005]
The preform heating station has a plurality of linear conveyance paths arranged in parallel, and a plurality of conveyance members supporting the preform are arranged in each conveyance path in the preform conveyance direction and circulated. I try to drive it.
[0006]
A heating box is provided in each conveyance path to heat the preform supported by the conveyance member.
[0007]
The conveyance member of each conveyance path is provided with a rotation sprocket, and each conveyance path is provided with a second rotation chain that is rotated by a first rotation chain for driving. Each conveying member is rotated by a chain via a sprocket so that the preform rotates.
[0008]
This preform heating station is an epoch-making one in which heating is performed relatively compactly and efficiently, and the preform can be uniformly heated in the circumferential direction by rotating the preform.
[0009]
However, when a plurality of linear conveyance paths are arranged in parallel, a sufficient distance of the conveyance path is necessary to perform sufficient heating, and there is still room for further space saving in this respect.
[0010]
Further, in order to rotate the preform, since the first rotation chain for driving and the second rotation chain disposed in each conveyance path are used, a space for disposing each time point chain is necessary. This also leaves room for further space saving.
[0011]
An object of the present invention is to provide a preform heating / conveying mechanism that can achieve space saving and facilitate transportation by adding a device to the transportation state of the preform.
[0012]
Another object of the present invention is to provide a preform heating / conveying mechanism and a heating / conveying member capable of saving space and facilitating transportation by devising a rotation mechanism.
[0013]
[Means for Solving the Problems]
  In order to achieve the above object, the preform heating and conveying mechanism of the present invention includes a conveying member that holds a plurality of preforms arranged in the longitudinal direction, and
  A transport path for circulating and transporting the transport member;
  Heating means for heating the preform held by the transport member while transporting the transport path;,HaveIn preform heating and conveying mechanism,
  The transport path is a linear forward path that transports a plurality of transport members arranged in a direction perpendicular to the longitudinal direction of the transport member;
  A straight return path that is arranged in parallel and adjacent to the forward path, and that transports a plurality of transport members arranged in the opposite direction to the forward path;,
Have
  The heating means is provided in both the forward path and the return path.
[0014]
According to the present invention, by transporting the transport member in a direction orthogonal to the longitudinal direction, the transport path having the heating means can be effectively used, and the return path adjacent to the forward path has the heating means in the same way. Compared with a simple return line of the conveying member, cost reduction and space saving can be achieved.
[0015]
  In the present invention, a rotation chain for rotating the preform is disposed in the forward path and the return path,
  SaidEach transportThe feeding member is provided with a preform holding member that is capable of rotating by holding each preform,
  The preform holding members are coupled to each other by interlocking means, and the preform holding members at both ends in the longitudinal direction of the conveying member are provided with rotation sprockets that mesh with the rotation chain. It is preferable.
[0016]
  With such a configuration, a mechanism for rotating each preform holding memberCarryThere is no need to install on the transmission line side.ShippingThe space on the transmission path side can be narrowed, and space can be saved.
[0017]
  The heating conveying member of the present invention includes a plurality of preform holding members that are capable of rotating by holding a plurality of preforms, and
  Toothed pulleys provided on each preform holding member,
  A toothed belt meshing with each toothed pulley;
  A rotation sprocket provided on the preform holding members at both ends and meshing with a rotation chain provided in the heating conveyance path;,
It is characterized by having.
[0018]
According to the present invention, since the heating conveying member can be interlocked by the toothed pulley and the toothed belt, there is no need to provide a mechanism for rotating each preform holding member on the heating conveying path side, Accordingly, the space on the heating conveyance path side can be reduced, and space saving can be achieved.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
[0020]
1 to 6 are views showing a heat-resistant container molding apparatus using a preform heating and conveying mechanism of the present invention as an embodiment of the present invention.
[0021]
FIG. 1 is a plan view showing the overall configuration of a heat-resistant container molding apparatus 10, and FIG. 2 is a side view thereof. The right side of FIG. 1 omits the heating box and the reverse delivery mechanism to show the configuration of the heating conveyance path 38, and the preform supply unit and transfer unit are omitted in FIG.
[0022]
The heat-resistant container molding apparatus 10 includes a preform supply unit 12, a heating station 14, a transfer unit 16, a blow molding station 18 as a blow molding machine, and a take-out unit 20 arranged in two lines in a straight line. It is installed.
[0023]
The preform supply unit 12 supplies a preform 22 having a neck portion to the heating station 14, and includes a supply rail 24, a preform receiving board 26, an alignment mechanism 28, and a reverse delivery mechanism 30.
[0024]
The supply rail 24 is disposed so as to incline downward toward the preform receiving board 26 side, and supports the lower portion of the neck of the preform 22 so that the preform 22 can be continuously conveyed by its own weight in an aligned state. Yes.
[0025]
The preform receiving plate 26 is formed in a disk shape, and recessed portions 32 for receiving the preforms 22 are formed on the outer periphery at two locations at predetermined intervals, and the preform receiving plate 26 is arranged in the direction of the arrow in FIG. , The preforms 22 are accommodated in the recesses 32 and received at predetermined intervals from the supply rail 24 two by two.
[0026]
The alignment mechanism 28 receives two preforms 22 received by the recess 32 of the preform receiving plate 26 and aligns the preforms 22 at a predetermined pitch. The alignment mechanism 28 is arranged from the preform receiving plate 26 to the heating station 14 side. It is installed.
[0027]
In the alignment mechanism 28, a plurality of holding members 34 are provided at intervals corresponding to the intervals of the recesses 32 of the preform receiving plate 26, and the holding members 34 rotate in the direction of the arrow in FIG. The preform 22 is received from the reform receiving board 26, and the preform 22 is aligned with the pitch of the preform 22 in the heating station 18.
[0028]
The reverse delivery mechanism 30 reverses the preform 22 aligned by the alignment mechanism 28 and transfers it to the heating station 14 in an inverted state. The six preforms 22 aligned on the heating station 14 side by the alignment mechanism 28 are provided. Is held and reversed, and after the preform 22 is transferred to the heating station 14, it is reversed and returned to the alignment mechanism 28 side.
[0029]
The heating station 14 heats the preform 22 supplied from the preform supply unit 12, and includes a heating conveyance member 36, a heating conveyance path 38, and a heating box 40, as shown in FIG. Two sets of left and right are arranged in exactly the same configuration.
[0030]
The heating conveying member 36 holds a plurality of, for example, six preforms 22 and is arranged on the heating conveying path 38 in a plurality, for example, 14 pieces.
[0031]
As shown in FIGS. 3 to 6, each heating conveyance member 36 has an elongated rectangular parallelepiped shape, and six preform holding members 152 protrude from the upper surface at a predetermined interval. In FIG. 3, the preform supply unit 12, the heating box 40, and the transfer unit 16 are omitted, and in particular, the heating conveyance members in the right column in the drawing are omitted.
[0032]
As shown in the partial cross-sectional view of FIG. 4, the preform holding member 152 penetrates the heating conveyance member 36 and is rotatably supported by the heating conveyance member 36 via a bearing 154.
[0033]
Further, as shown in FIGS. 5 and 6, a toothed pulley 156 is attached to the lower end side of each preform holding member 152, and the toothed pulley 156 is connected by a toothed belt 158 that meshes with the pulley. In addition, the preform holding members 152 can be rotated in conjunction with each other.
[0034]
The toothed belt 158 is held by the spacer 160 so as not to mesh with the toothed pulley 156 at the return side position.
[0035]
Further, a rotation sprocket 162 is attached to the lower end of the preform holding member 152 at both ends of the heating conveyance member 36.
[0036]
Then, the rotation sprocket 162 meshes with a rotation chain 164 provided on the heating conveyance path 38 side in FIG. 3, and the rotation chain 164 is driven by the rotation motor 166, thereby each preform holding member. 152 rotates to rotate the preform 22.
[0037]
In addition, the rotation chain 164 is provided in each of an outward path and a return path described later.
[0038]
Further, each heating conveyance member 36 is formed with a conveyance engagement hole 168 penetrating in the vertical direction in the vicinity of both sides, and a stopper and conveyance engagement groove 170 is formed on both side surfaces in the longitudinal direction. ing.
[0039]
The heating conveyance path 38 is formed in a substantially rectangular shape having an outward path 42 and a return path 44 for linearly conveying the heating conveyance member 36.
[0040]
In the heating conveyance path 38, the heating conveyance member 36 is installed in a state where the longitudinal direction thereof coincides with the longitudinal direction of the molding apparatus 10.
[0041]
2 and 3, the heating transport member 36 is sequentially circulated and transported in a substantially rectangular shape as indicated by the arrows in FIG.
[0042]
As is well shown on the right side of FIG. 3, the transport mechanism 46 includes a pair of forward path transport rails 172, a pair of return path transport rails 174, a pair of return path transport rails 176, and a pair of forward paths. Transitional transfer rail 178.
[0043]
The forward conveyance rail 172 conveys the heating conveyance member 36 one by one toward the inside of the molding apparatus 10 in a direction orthogonal to the longitudinal direction of the heating conveyance member 36. One forward cylinder 180 and forward table 182 are provided.
[0044]
The forward movement table 182 is located between the forward conveyance rails 172, and a claw portion 186 raised by the elevating cylinder 184 shown in FIG. 198 is engageable.
[0045]
The forward table 182 is provided with a pair of second forward cylinders 188, and the forward table 182 is engaged with the claw portions 186 along the guide rails 190 by driving the second forward cylinder 188. The conveying members 36 for heating from the second to the end are simultaneously moved one by one.
[0046]
The second forward cylinder 188 is driven at the same time as the first forward cylinder 180 pushes the end face of the heating conveyance member 36 at the start position of the forward path 42, and all the heating conveyance members 36 on the forward path 42 are indicated by arrows. It is designed to transport in the direction.
[0047]
After the conveyance, the engagement projection 206 is engaged with the engagement groove 170 of the heating conveyance member by the engagement cylinder 204, the first forward movement cylinder 180 is retracted, and the forward movement base 182 is lowered by the elevating cylinder 184. The claw portion 186 is engaged with the engagement hole 168 of the heating conveyance member 36 to prepare for the next conveyance by the second forward cylinder 188.
[0048]
One of the return path transfer rails 174 extends from the forward path 42 to the return path 44 along the end surface on the molding machine center side of the heating transport member 36 transported in the A direction, and the other of the heating transport member 36 is The end face on the outside of the molding machine is reciprocated between the forward end 42 and the start end of the return path 44.
[0049]
The return path transition table 210 includes guide rail portions 212 that guide and support both ends in the longitudinal direction of the heating transport member 36, and is connected to the return path transition rodless cylinder 208 and travels along the return path moving table guide rail 218 along the forward path 42. Reciprocatingly move between the terminal end of the head and the start end of the return path 44.
[0050]
The heating transport member 36 transported in the A direction on the forward path 42 is supported by the return path transition stand 210 waiting at the end portion of the forward path 42, and is guided by the return path transport rail 174 while being rodless for return path transition. The cylinder 208 is driven to move toward the starting end side of the return path 44.
[0051]
The return path 44 has basically the same configuration as the forward path 42, and transports the heating transport member 36 in the opposite direction to the forward path 42.
[0052]
The return path transport rail 176 is transported in the B direction and transports the heating transport member 36 disposed at the start end of the return path in the C direction. As a drive mechanism, the return path transport rail 176 includes a pair of first return cylinders 192 and a return path. And a moving table 194.
[0053]
The first reverse cylinder 192 is used in the same manner as the first forward cylinder 180, but has an engagement plate having two engagement protrusions 200 that engage with the engagement grooves 170 at both ends of the heating conveyance member 36. 198 and an engagement cylinder 196 for advancing and retracting the engagement plate 198 with respect to the heating conveyance member 36.
[0054]
The return table 194 is exactly the same as the forward movement # 82.
[0055]
When the claw portion 186 of the return table 194 is engaged with the second heating conveyance member 36 from the start end portion of the return path 44, the engagement cylinder 196 of the first return cylinder 192 causes the second position from the start end portion of the return path 44 to be second. The engagement protrusion 200 is released from the third heating conveyance member 36, the engagement plate 198 is moved to the start end portion of the return path 44 by the first return cylinder 192, and the heating conveyance member 36 supported by the return path moving table 210. The engaging protrusion 200 is engaged with the second heating conveying member 36.
[0056]
When the second return cylinder 202 and the first return cylinder 192 are driven, all the heating conveyance members 36 on the return path are simultaneously moved one by one in the C direction.
[0057]
After the movement, the claw portion 186 is lowered and restored to the original position by the second return cylinder 202, and the claw portion 186 is engaged with the engagement hole 168 of the heating conveyance member 36. When the claw portion 186 is engaged, the engagement projection 200 is released by the engagement cylinder 196 to prepare for the next conveyance.
[0058]
In addition, the vacant return path moving table 210 returns to the end of the forward path 42 and stands by.
[0059]
One of the forward transfer transport rails 178 extends from the return path 44 to the forward path 42 along the outer end surface of the heating transport member 36 transported in the C direction, and the other is the molding of the heating transport member 36. The end surface on the machine center side reciprocates between the return path 44 and the start end of the forward path 2.
[0060]
The forward path transition table 216 includes guide rail portions 212 that guide and support both ends of the heating conveyance member 36 in the longitudinal direction. The forward path transition table 216 is connected to the forward path transition rodless cylinder 214 and returns along the forward path moving platform guide rail 220. Reciprocatingly move between the terminal end of the front end and the start end of the forward path 42.
[0061]
The heating transport member 36 transported to the start position of the forward path 44 by the forward path transition table 210 moves in the forward transport direction, and then retracts toward the return path 44 side.
[0062]
In this manner, the heating conveyance member 36 rotates the preform 22 while being conveyed in the substantially rectangular shape from the A direction to the D direction along the forward path 42 and the backward path 44 along the heating conveyance path 38.
[0063]
The rotation chain 164 for rotation is arranged so as to mesh with the rotation sprocket 162 on the left side of the heating conveyance member 36 stopped in the outward path along the left side of the forward path 42 in the A direction. A rotation chain 164 is disposed on the return path 44 so as to mesh with the rotation sprocket 162 on the left side of the heating conveyance member 36 stopped on the return path along the left side in the C direction.
[0064]
The heating box 40 is provided above the forward path 42 and the return path 44, and heats the preform 22 by a heater (not shown).
[0065]
In this way, by providing heating boxes on both the forward path 42 and the return path 44 of the heating conveyance path 38, there is no return line that does not work at all, the heating station 14 is saved, and the heating efficiency is improved. I have to.
[0066]
The transfer unit 16 moves forward with the preform gripping member opened so as not to interfere with the preform 22 so as not to interfere with the preform 22 with respect to the heating conveyance member 36 conveyed to the outermost position (end position) of the return path 44. The preform on the heating conveyance member 36 conveyed to 216 is gripped and lifted as it is to extract the preform 22.
[0067]
And it moves to the blow molding station 18 side from that position, descends, separates the preform 22, and moves backward, so that the preform 22 is delivered to the blow molding station 18 in an inverted state.
[0068]
Further, in the transfer unit 16, during the transfer of the preform 22, the pitch of the preform 22 at the heating station 14 is converted to the pitch at the time of blow molding at the blow molding station 18 and transferred.
[0069]
Note that the transfer unit 16 causes the heating conveyance member 36 located on the outermost side of the return path 44 to be in an empty state after the preform 22 is extracted, and the heating conveyance member 36 in the empty state becomes the start end of the forward path 42. Then, the preform 22 is delivered from the reversal delivery mechanism 32 to the empty heating conveyance member 36.
[0070]
The blow molding station 18 includes a blow conveyance member 50, a blow conveyance path 52, a receiving unit 54, a primary blow molding unit 56, a primary heat treatment unit 58, a secondary heat treatment unit 60, and a final blow molding unit 62. With.
[0071]
The blow conveying member 50 is configured to hold the six preforms 22 at the pitch at the time of blow molding.
[0072]
The blow conveyance path 52 has a substantially rectangular shape having an outward path 64 and a return path 66 for linearly conveying the blow conveyance member 50.
[0073]
The forward path 64 has two rows at both outer positions of the molding apparatus 10, and has forward path transport rails 68 disposed along the longitudinal direction of the forward path 64, and the blow transport member 50 is disposed along the forward path transport rail 68. It can be conveyed from the transfer unit 16 side to the take-out unit 20 side with its longitudinal direction as front and back.
[0074]
The forward path 64 is provided with two sets of forward path transport mechanisms 70 along each forward path transport rail.
[0075]
The forward path transport mechanism 70 includes a rod 74 having a plurality of engagement plates 72 protruding in one direction at predetermined intervals, a rotary actuator 76 that rotationally drives the rod 74, and the rod 74 is moved along the forward path 64. A ball screw 78 and an electric servo motor 80 that rotationally drives the ball screw 78 are provided.
[0076]
Then, the rod 74 is rotated by the rotary actuator 76 so that the engagement plates 72 are brought into contact with both ends in the longitudinal direction of the blow conveying member, and the ball screw 78 is rotated by the electric servo motor 80, whereby the rod 74 and the rotary actuator 76 are rotated. Is moved along the forward path 64, and the blow conveying member 50 is moved by a predetermined distance via the engagement plate 72.
[0077]
After the movement, the rod 74 is rotated by the rotary actuator 76 to release the engagement between the engagement plate 72 and the blow conveying member 50, and the ball screw 78 is rotated in the reverse direction by the drive servo motor 80 to move the rod 74. By returning the predetermined distance, the blow conveying member 50 can be intermittently conveyed by a predetermined distance.
[0078]
The return path 66 has two rows of return path transport rails 84 supported on a plurality of support columns 82 installed along the longitudinal direction at the central position of the molding apparatus 10, and blows along the return path transport rail 84. The conveyance member 50 can be conveyed.
[0079]
In addition, the return path 66 is provided with a set of return path transport mechanisms 86 similar to the forward path transport rails 84 along the return path transport rails 84.
[0080]
The return path transport mechanism 86 is provided with a pair of return path transport mechanisms 86 similar to the forward path transport mechanism 70 between two rows of return path transport rails 84.
[0081]
The return path transport mechanism 86 includes a rod 74 extending between two rows of return path transport rails 84, and a plurality of engagement plates 72 projecting to both sides of the rod 74 and engaging with the blow transport members 50 on both sides. , A rotary actuator 76, a ball screw 78, and an electric servo motor 80.
[0082]
Then, the rod 74 is rotated by the rotary actuator 76 so that the engagement plate 72 is brought into contact with the end of the two rows of blow conveying members 50, and the ball screw 78 is rotated by the electric servo motor 80, thereby It is moved along the return path 66 and the blow transport member 50 is transported in the direction opposite to the forward path 64 at predetermined intervals.
[0083]
Thus, by using the electric servo motor 80 as the drive source of the return path 66, the hydraulic drive device does not exist above the molding space, and can be kept clean.
[0084]
Further, the blow transport path 52 is provided with a gathering mechanism 88 that gathers and delivers the blow transport member 50 from the forward path 64 side to the return path 66 side between the end of the forward path 64 and the start end of the return path 66. In addition, a distribution mechanism 90 is provided between the end of the return path 66 and the start end of the forward path 64 to distribute and transfer the blow transport member 50 from the return path 66 side to the forward path 64 side.
[0085]
As shown in FIG. 5, the gathering mechanism 88 has a forward divided rail portion 92 formed by dividing the end portion of the forward conveyance rail 68 on the forward passage 64 side, and the return conveyance rail 84 on the backward route 66 side. There is a return-way split rail portion 100 having a start end portion corresponding to the forward-way split rail portion 92.
[0086]
The return-path split rail section 100 includes a lift ball screw 102 that lifts and lowers the return-path split rail section 100 simultaneously in two rows, and an electric servo motor 104 that rotationally drives the lift ball screw 102.
[0087]
Further, the forward divided rail portion 92 includes a horizontal ball screw 92 for horizontally moving the forward divided rail portion 92 from the forward conveying rail 68 to a lift position of the return divided rail together with a lifting cylinder 94 and a horizontal ball screw 92. And an electric servo motor 98 for rotationally driving the motor.
[0088]
In this state, the horizontal ball screw 96 is rotated by the electric servo motor, and the forward traveling divided rail 92 is moved.
[0089]
The return split rail 100 waits at the lower limit by the lifting ball screw 102 sooner than the arrival of the forward split rail 92, and when the forward split rail 92 arrives above the return split rail 100, the lift ball The return path split rail 84 is raised by the screw 102, receives the blow transport member 50, rises to the starting end position of the return path split rail 84, and is returned to the end side by the return path transport mechanism 86.
[0090]
During this time, the outgoing rail segment 92 is returned to the position of the forward rail 68 by the horizontal ball screw 96 and is returned to the height of the forward rail 68 by the elevating cylinder 94 and the next blow conveying member 50 is moved. I will wait.
[0091]
The dispersal mechanism 90 performs the reverse operation of the gathering mechanism 88. On the outward path 64 side, the forward path split rail section 106 in which the start end portion of the forward path transport rail 68 is divided, and the forward path split rail section 106. A lifting and lowering cylinder 108 for moving up and down, a horizontal ball screw 110 for horizontally moving the forward divided rail portion 106 together with the lifting and lowering cylinder 108 below the return path conveying rail 84, and an electric servo (not shown) for rotationally driving the horizontal ball screw 110. And a motor.
[0092]
Further, on the return path 66 side, the end portion of the return path transport rail 84 is a return path rail section 112 formed so as to correspond to the forward path split rail section 106, and a lift ball screw 114 that moves the return path split rail section 112 up and down. And an electric servo motor (not shown) that rotationally drives the elevating ball screw 114.
[0093]
When the blow conveying member 50 is conveyed to the return path split rail portion 112, the return path split rail portion 112 is lowered by the lifting ball screw 114.
[0094]
At this time, the forward rail segment 106 is moved to the lower position of the return path rail 84 by the horizontal ball screw 110 while being in the raised position by the lifting / lowering cylinder 108. The blow conveying member 50 is transferred.
[0095]
In this case, the forward divided rail 106 is in the lowered position without the lifting cylinder 108 being operated.
[0096]
When the return rail segment 112 is lowered, the elevating cylinder 108 is actuated to raise the forward rail segment 106, and the blow conveying member 50 is transferred onto the forward rail segment 106.
[0097]
In this state, when the forward divided rail portion 106 is moved to the forward conveyance rail 68 side by the horizontal ball screw 110 and the forward divided rail portion 106 is lowered by the lifting cylinder 108, the state is such that the conveyance on the forward route 42 is possible. Become.
[0098]
In this way, the drive source of the gathering mechanism 88 and the dispersion mechanism 90 is an electric servo motor, so that the timing when the blow conveying member 50 is delivered from the forward path 64 to the backward path 66 or from the backward path 66 to the forward path 64 can be accurately and accurately. It can be easily controlled and a good operating state can be obtained.
[0099]
The receiving unit 54 is located at the starting end position of the forward path transport rail 68 and receives the preform 22 from the transfer unit 16 onto the blow transport member 50.
[0100]
The primary blow molding part 56, the primary heat treatment part 58, the secondary heat treatment part 60 and the final blow molding part 62 are arranged linearly along the blow conveyance path 52.
[0101]
In FIG. 2, the state of the molded product conveyed along the forward path 64 is shown by omitting the outer clamping plate of each clamping mechanism. Further, the state of the return path 66 is represented by omitting the raised bottom lifting mechanism of each molding part.
[0102]
The primary blow molding unit 56 has a primary blow molding mechanism 116.
[0103]
The primary blow molding mechanism 116 has a primary blow molding die 118 composed of a split mold, and the primary blow molding die 118 is clamped by a mold clamping mechanism 120 so that a primary blow molding product 124 larger than the final molding 122 is formed. It is designed to be molded.
[0104]
The primary heat treatment unit 58 has a primary heat treatment mechanism 126.
[0105]
The primary heat treatment mechanism 126 has a primary heat treatment mold 128 composed of a heated split mold. The primary heat treatment mold 128 is clamped by a mold clamping mechanism 120, and the primary molded product 124 is primary pressed while being pressurized from the inside with high pressure. Heat treatment is performed by contacting the inner surface of the heat treatment mold 128.
[0106]
When the primary heat treatment mold 128 is opened after the heat treatment is completed, the primary blow-molded product is contracted to remove the distortion, and an intermediate molded product 130 slightly smaller than the final molded product 122 is obtained.
[0107]
The secondary heat treatment section 60 has a secondary heat treatment box 132, and the intermediate molded product 130 is heated in the secondary heat treatment box 132 with almost no contraction.
[0108]
The final blow molding unit 62 has a final blow molding mechanism 134.
[0109]
The final blow molding mechanism 134 has a final blow molding die 136 composed of a split mold, and the final blow molding die 136 is clamped by the mold clamping mechanism 120 and blow molded into the final molded product 122. .
[0110]
  Here, the primary blow molding mechanism 116, the primary heat treatment mechanism 126, and the final blow molding mechanism 134 each have a mold clamping mechanism 120, and these mold clamping mechanisms 120 have a substantially common configuration. 3 to 6 primary blow molding mechanism116Will be described with reference to FIG.
[0111]
The mold clamping mechanism 120 clamps two primary blow molds 128 (primary heat treatment mold 128 and final blow mold 136) disposed in each of the two forward paths 64 of the blow conveyance path 52 at the same time. Then, the four mold clamping plates 138a to 138d supporting each primary blow molding die 128 are connected by a plurality of, for example, four tie rods 140 so that the molds can be opened and closed simultaneously, and the portion without the tie rods 140 is a belt member. The plates 142 are connected.
[0112]
A pair of toggle mechanisms 144 are arranged between the two inner mold clamping plates 138, and the toggle mechanism 144 is driven by a mold clamping air cylinder 146 to open and close the mold.
[0113]
The mold clamping force is obtained by an air cylinder 148 provided on the outer two mold clamping plates 138.
[0114]
A common return path transport mechanism 86 is provided above the toggle mechanism 144.
[0115]
Thus, by making it possible to open and close two molds simultaneously with one toggle mechanism 144, a mechanism required for opening and closing one mold can be omitted, and space can be saved. By providing the common return path transport mechanism 86, one of the return path transport mechanisms can be omitted, and further space saving can be achieved.
[0116]
The take-out unit 20 has a take-out device 150, holds the final molded product 122 conveyed to the terminal position of the forward path conveyance rail 68, inverts it, and discharges it out of the device.
[0117]
The present invention is not limited to the above-described embodiment, and can be modified into various forms within the scope of the gist of the present invention.
[0118]
For example, in the above-described embodiment, the case where the heating station and the blow molding station are provided has been described. However, an injection molding station can be combined therewith.
[0119]
Moreover, in the said embodiment, although the conveyance path for heating is provided in 2 rows, it is not restricted to this, It can also be made into 1 row or 3 rows or more.
[Brief description of the drawings]
FIG. 1 is a plan view showing an overall configuration of a heat-resistant container molding apparatus using a preform heating and conveying mechanism of the present invention as an embodiment of the present invention.
2 is a side view of the apparatus for forming a heat-resistant container in FIG. 1. FIG.
FIG. 3 is an enlarged plan view seen from the left side of FIG.
FIG. 4 is a side view of a heating conveyance member.
FIG. 5 is a bottom view of a heating conveyance member.
6 is a side view seen from the side of FIG. 5;
[Explanation of symbols]
10 Heat-resistant container molding equipment
22 preform
36 Heating conveying member
38 Heating path
40 Heating box
42 Outbound
44 Return
46 Transport mechanism
152 Preform holding member
156 Pulley with teeth
158 Toothed belt
162 Sprocket for rotation
164 Chain for rotation

Claims (3)

A conveying member that holds a plurality of preforms arranged in the longitudinal direction; and
A transport path for circulating and transporting the transport member;
In the preform heating and conveying mechanism having a heating means for heating the preform held by the conveying member while conveying the conveying path,
The transport path is a linear forward path that transports a plurality of transport members arranged in a direction perpendicular to the longitudinal direction of the transport member;
A rectilinear return path that is arranged in parallel adjacent to the forward path, and transports a plurality of transport members in a direction opposite to the forward path;
Have
The preform heating and conveying mechanism, wherein the heating means is provided in both the forward path and the backward path. In claim 1,
In the forward path and the return path, a rotation chain for rotating the preform is disposed,
Each conveying member is provided with a preform holding member that is capable of rotating by holding each preform,
The preform holding members are coupled to each other by interlocking means, and the preform holding members at both ends in the longitudinal direction of the conveying member are provided with rotation sprockets that mesh with the rotation chain. A preform heating and conveying mechanism. In claim 2,
The interlocking means is
Toothed pulleys provided on each preform holding member,
A toothed belt meshing with each toothed pulley;
Have a,
The rotational force of the preform holding member provided with the rotating sprocket rotating in mesh with the rotating chain is applied to the other preform holding members in the conveying member via the toothed pulley and the toothed belt. A preform heating and conveying mechanism that is transmitted .

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