JP5356059B2 - Rotary injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary injection molding machine which can prevent the leakage of temperature conditioning water and is inexpensive and easy in maintenance. <P>SOLUTION: The rotary injection molding machine has a rotary table, a plurality of movable molds fitted to the table, and a temperature conditioning water piping structure which circulates temperature conditioning water to each movable mold through the rotary table. The temperature conditioning water piping structure comprises a fixed pipe 31 arranged in the rotational axis 16 of the rotary table 11, swivel joints 32a and 32b connected to ends of the fixed pipe 31, temperature conditioning blocks 33a and 33b fitted swingingly and slidably to the rotary table, first flexible pipes 34a and 34b connecting the swivel joints and the temperature conditioning blocks to each other, and second flexible pipes 35a and 35b connecting temperature conditioning and each movable mold 21 or 22 to each other. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a rotary injection molding machine used for multicolor molding and multilayer molding of a synthetic resin, and more particularly to a piping structure for temperature-controlled water provided in a rotary table.

  The rotary injection molding machine attaches multiple fixed molds to a fixed die plate, and attaches the same number of movable molds as the fixed mold to a rotary table placed opposite to the fixed die plate. The resin material which comprises each part by injecting resin from a plurality of injection devices for each combination of molds by sequentially changing the combination of each fixed mold and each movable mold by rotationally driving Are used for molding different molded products. The rotary die and the movable die plate that rotatably holds the rotary table are provided with temperature regulation water piping for circulating temperature regulation water to each mold.

  A conventional rotary injection molding machine is equipped with a rotary joint with a fixed side attached to a movable die plate and a rotary side attached to a rotary table on a part of the temperature adjustment water piping. Temperature control water is supplied through the rotary joint. The temperature-controlled water supplied from the apparatus is supplied to each mold through a temperature-controlled water pipe connecting the rotary joint and each mold (see, for example, Patent Document 1).

JP 2006-347015 A

  A waterproof seal is provided between the fixed side and the rotary side of the rotary joint so that water leakage from the portion can be prevented for the time being. However, since the rotary joint rotates 360 ° with respect to the fixed side, the waterproof sheet tends to deteriorate due to wear, regardless of how severe the waterproof seal is in the initial state. It becomes easy to leak from the rotating sliding surface. For this reason, in the rotary injection molding machine provided with the conventional rotary joint, as described in Patent Document 1, special means for removing the temperature-controlled water leaking from the rotary joint must be provided. In addition, there is a problem that the configuration is complicated and the manufacturing cost is expensive.

  The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide a rotary injection molding machine that can prevent leakage of temperature-controlled water, is low in cost, and is easy to maintain. is there.

  In order to solve the above-mentioned problems, the present invention firstly provides a tie bar that is bridged between a fixed die plate and a tailstock, and a movable die that is guided by the tie bar and moves in a mold closing direction and a mold opening direction. A plate, a disk-like rotary table rotatably attached to the movable die plate via a rotation center axis, a plurality of fixed-side molds attached to the fixed die plate, and the rotary table attached to the rotary table In a rotary injection molding machine including a plurality of movable-side molds and a temperature-controlled water piping structure that circulates temperature-controlled water through the movable-side mold, the temperature-controlled water piping structure is formed in a hollow shape. A fixed pipe disposed in the central axis, a swivel joint connected to an end of the fixed pipe, and a temperature control block that is swingably and slidably attached to the rotary table And the configuration of becoming a first and a flexible tube, and a second flexible tube for connecting the temperature control block and said movable mold for connecting the swivel joint and the temperature control block.

  A fixed pipe is arranged in the rotation center axis of the rotary table, a swivel joint is connected to the end of the fixed pipe, and the swivel joint and the temperature control block attached to the rotary table are connected via the first flexible pipe. Then, when the rotary table is driven to rotate, the rotating part of the swivel joint does not rotate 360 ° with respect to the fixed part, but only oscillates within a relatively small angle range, thereby extending the useful life of the waterproof seal. Therefore, the temperature-controlled water can be circulated without any trouble for a long time. Further, when the temperature control block is swingably and slidably attached to the rotary table, it is possible to absorb the positional deviation of the temperature control block with respect to the swivel joint that occurs with the rotation of the rotary table. Excessive stress does not act on the tube, and the service life of the first flexible tube can be extended.

  Secondly, according to the present invention, the temperature adjustment water pipe structure includes a temperature control water supply route for supplying temperature adjustment water to the movable side mold, and a temperature for recovering the temperature adjustment water returning from the movable side mold. A configuration is provided in which a plurality of water conditioning recovery routes are provided.

  According to such a configuration, by supplying temperature-controlled water having different water temperatures for each temperature-controlled water supply route, it is possible to circulate the temperature-controlled water adjusted to an appropriate temperature for each movable mold. The movable mold can be molded under optimum temperature conditions, and a good product can be manufactured efficiently.

  In the rotary injection molding machine of the present invention, a fixed pipe is disposed in the rotation center axis of the rotary table, a swivel joint is connected to the end of the fixed pipe, and the swivel joint and the rotary table are swingable and slidable. Since the attached temperature control block is connected via the first flexible pipe, the service life of the swivel joint and the first flexible pipe can be extended, and the maintenance of these members can be facilitated. Thus, the operating efficiency of the rotary injection molding machine can be increased.

It is a front view of the rotary injection molding machine concerning an embodiment. It is a top view of the rotary injection molding machine concerning an embodiment. It is a front view of the movable die plate concerning an embodiment. It is the side view which carried out partial cross section of the movable die plate concerning an embodiment. It is principal part sectional drawing which shows the structure of the support roller which concerns on embodiment. It is operation | movement explanatory drawing of the rotary injection molding machine which concerns on embodiment. It is a figure which shows the effect of the rotary injection molding machine which concerns on embodiment.

  Hereinafter, an embodiment of a rotary injection molding machine according to the embodiment will be described with reference to FIGS. 1 to 7. As shown in FIGS. 1 and 2, the rotary injection molding machine of this example includes a base frame 1, a mold opening / closing unit 2 disposed on the base frame 1, and a base frame 1 that is parallel to each other in the horizontal direction. It has two injection units 3 arranged on the top.

  The mold opening / closing unit 2 is mounted between a tail stock 4 on which a mold opening / closing motor (not shown) is mounted, a fixed die plate 5 on which two fixed molds (not shown) are mounted, and the tail stock 4 and the fixed die plate 5. A plurality of tie bars 6 passed and a movable die plate 7 guided by the plurality of tie bars 6 and moved back and forth in the horizontal direction between the tailstock 4 and the fixed die plate 5 are configured.

  As shown in FIGS. 3 and 4, the movable die plate 7 has a disk-shaped rotary table 11, first and second support rollers 12 and 13 that support the rotary table 11, and the rotary table 11 is driven to rotate. First and second electric servo motors 14 and 15 are attached.

  The rotary table 11 is rotatably attached to the movable die plate 7 via a hollow rotation center shaft 16 and a bearing 17 provided on the outer periphery of the rotation center shaft 16. The rotary table 11 of this example has a disk-like outer shape, and has a support surface 18 that is formed smoothly on the outer periphery and gear teeth that are uniformly provided at a constant pitch on the entire periphery. The surface 19 is formed concentrically. In this example, the diameter of the support surface 18 is smaller than the diameter of the gear surface 19, but conversely, the diameter of the gear surface 19 is smaller than the diameter of the support surface 18. You can also On the front side of the rotary table 11 (the surface facing the fixed die plate 5), the first and second movable members are located at point-symmetric positions about the rotation center axis 16 via the mold mounting plate 20. Side molds 21 and 22 are attached. These first and second movable molds 21 and 22 are respectively disposed opposite to two fixed molds (not shown) attached to the fixed die plate 5.

  The rotary table 11 is rotationally driven intermittently by 180 ° for each molding cycle, and two fixed molds attached to the fixed die plate 5 and two movable molds 21 attached to the rotary table 11. The combination with 22 is switched alternately. On the other hand, the injection unit 3 is configured to inject different resins, one of the injection units performs a single color injection, and the other injection unit 3 performs the injection to a mold holding a single color molded product. By performing, two-color molding or two-layer molding with two resin materials is performed.

  As shown in FIG. 5, the first and second support rollers 12 and 13 are rotatable via a bearing 25 at the tip of a roller holding shaft 24 whose one end is fixed to the movable die plate 7 with a bolt 23. The outer peripheral surface thereof is in contact with the support surface 18 of the rotary table 11. As described above, when the rotary table 11 is supported by the first and second support rollers 12 and 13, the bending moment acting on the rotation center shaft 16 of the rotary table 11 can be eliminated, so that the rotary table in the horizontal rotary injection molding machine can be eliminated. 11 and wear of the bearing 17 can be prevented. The first and second support rollers 12 and 13 are equally arranged on both side portions via a virtual vertical line YY passing through the rotation center axis 16 of the rotary table 11. The arrangement positions of the first and second support rollers 12 and 13 are appropriately set so that the angle formed between the straight line connecting the support rollers 12 and 13 and the rotation center axis 16 and the virtual vertical line YY is within 45 °. Set to position. Thereby, the weight of the rotary table 11 can be hold | maintained stably and highly efficiently.

  The first and second electric servomotors 14 and 15 have the same rated output, and are fixed to the movable die plate 7 using bolts 26 as shown in FIG. As described above, when the two electric servomotors 14 and 15 having the same rated output are used, the parts management and the assembly process at the time of manufacturing can be simplified, so that the rotary injection molding machine can be manufactured with high efficiency. Can do. The main drive gears 27 and 28 are attached to the output shafts of the first and second electric servo motors 14 and 15, and the main drive gears 27 and 28 are provided on the gear surface 19 of the rotary table 11. Meshed with gear teeth. Therefore, when the first and second electric servo motors 14 and 15 are rotationally driven, the rotary table 11 is rotated via the main driving gears 27 and 28 and the gear surface 19. The first and second electric servo motors 14 and 15 are respectively outside the first and second support rollers 12 and 13 via a virtual vertical line YY passing through the rotation center axis 16 of the rotary table 11. It is equally arranged on both sides of the lever. The arrangement position is set in a range in which the first and second electric servo motors 14 and 15 do not protrude in the lateral direction of the rotary table 11. Thereby, the horizontal width of the movable die plate 7 can be reduced, and the rotary injection molding machine can be made compact.

  3 and 4 is provided on the rotary table 11, and the temperature-controlled water supplied from a temperature-controlled water supply device (not shown) passes through the temperature-adjusted water pipe structure. It is circulated in the molds 21 and 22.

  The temperature control water pipe structure according to the present embodiment is disposed inside the rotation center shaft 16, one end of which is welded to a bearing retainer 29 provided on the back side of the movable die plate 7, and the fixing The swivel joints 32a and 32b connected to one end of the pipe 31, the temperature control blocks 33a and 33b attached to the rotary table 11 so as to be swingable and slidable, and the swivel joints 32a and 32b. From the first flexible pipes 34a and 34b connecting the temperature control blocks 33a and 33b, and the second flexible pipes 35a and 35b connecting the temperature control blocks 33a and 33b and the movable molds 21 and 22, respectively. Become. The subscript a attached to the reference numerals representing the respective members indicates a route for supplying temperature-controlled water to the movable molds 21 and 22, and the subscript b is from the movable molds 21 and 22. It shows what constitutes the return route of temperature-controlled water.

  The fixed pipe 31 is formed in a cylindrical shape, and the temperature control water from the supply pipe 31a for supplying temperature adjustment water to the movable molds 21 and 22 and the movable molds 21 and 22 is not shown in the inside thereof. A return pipe 31b is formed to return to the temperature control water supply device. One end of the fixed pipe 31 located on the back side of the movable die plate 7 is connected to the temperature-controlled water supply device via a required connection pipe. On the other hand, the other end of the fixed pipe 31 located on the surface side of the rotary table 11 is attached with a fixing portion of the swivel joints 32a and 32b for each of the pipe lines 31a and 31b.

  The temperature adjustment block 33a distributes the temperature adjustment water supplied from a temperature adjustment water supply device (not shown) to the movable molds 21 and 22, and the temperature adjustment block 33b includes the movable molds 21 and 22. The temperature-controlled water returning to the temperature-controlled water supply device (not shown) is merged. These temperature control blocks 33a and 33b are connected to the rotating portions of the swivel joints 32a and 32b described above via first flexible tubes 34a and 34b. The temperature control blocks 33a and 33b and the movable molds 21 and 22 are connected via second flexible tubes 35a and 35b.

  As shown in FIGS. 3 and 4, the temperature control blocks 33 a and 33 b are attached to the mold attachment plate 20 via the first bracket 41 and the second bracket 43. That is, an L-shaped first bracket 41 is attached with a bolt to the central portion of the long side of the mold mounting plate 20 formed in a substantially rectangular shape, and a long hole is formed in the standing piece of the first bracket 41. 42 has been established. On the other hand, L-shaped second brackets 43 are attached to the top surfaces of the temperature control blocks 33a and 33b by bolts, and circular bolt through holes (not shown) are provided in the standing pieces of the second brackets 43. Has been established. And these 1st and 2nd brackets 41 and 43 are combined in the state which matched the long hole 42 and the bolt through-hole, and the two nuts 45 and 46 are screwed together by the volt | bolt 44 penetrated by these each hole. Then, the bolts 44 are integrated by tightening these two nuts 45 and 46 so that no tightening force acts on the head of the bolt 44. As a result, each of the temperature control blocks 33a and 33b can swing around the bolt 44 and can slide in the length direction of the long hole 42.

  In the rotary injection molding machine according to the embodiment, a fixed 31 pipe is disposed in the rotation center shaft 16 of the rotary table 11, and swivel joints 32 a and 32 b are connected to ends of the fixed pipe 31. Since the temperature control blocks 33a and 33b attached to the rotary table 11 (die mounting plate 20) are connected via the first flexible tubes 34a and 34b, the rotary table 11 is rotationally driven as shown in FIG. In this case, the rotating parts of the swivel joints 32a and 32b do not rotate 360 ° with respect to the fixed part, but only swing within a relatively small angle range. Therefore, unlike the case where a rotary joint is used, the waterproof seal provided between the rotating part and the fixed part is not easily deteriorated, the service life of the swivel joints 32a and 32b is extended, and the maintenance is facilitated. can do.

  Further, in the rotary injection molding machine according to the embodiment, the temperature control blocks 33a and 33b are swingably and slidably attached to the rotary table 11. Therefore, by rotating the rotary table 11, the swivel joint 32a, Even when the distance between the mounting position of 32b and the mounting position of temperature control blocks 33a and 33b varies, the variation can be absorbed by the swinging and sliding of temperature control blocks 33a and 33b. Excessive stress can be prevented from acting on the flexible tubes 34a and 34b, and the service life of the first flexible tubes 34a and 34b can be extended.

  That is, as is clear from a comparison between FIG. 7A and FIG. 7B, the mounting positions of the swivel joints 32a and 32b are constant regardless of the rotational position of the rotary table 11, so that the rotary table 11 rotates. When the mold mounting plate 20 is turned sideways, the distance from the mounting position of the swivel joints 32a and 32b to the central portion of the long side of the mold mounting plate 20 becomes longer, and the mold mounting plate 20 is turned vertically. The distance from the mounting position of the swivel joints 32a, 32b to the central part of the long side of the mold mounting plate 20 becomes shorter. Therefore, if the temperature control blocks 33a and 33b are fixed to the rotary table 11, the first flexible pipes 34a and 34b are greatly deformed to absorb the difference in distance as shown in FIG. Excessive stress acts between the swivel joints 32a and 32b and the first flexible pipes 34a and 34b, and between the temperature control blocks 33a and 33b and the first flexible pipes 34a and 34b, so that the first flexible The tubes 34a and 34b are easily broken.

  On the other hand, when the temperature control blocks 33a and 33b are attached to the rotary table 11 so as to be swingable and slidable, as shown in FIGS. When the temperature adjustment blocks 33a and 33b are moved to the position closest to the long side of the mold mounting plate 20, the temperature control blocks 33a and 33b are moved to the mold. While moving in a direction away from the long side of the mounting plate 20 and the temperature control blocks 33a and 33b swing according to the deformation of the first flexible tubes 34a and 34b, the stress acting between the members is reduced or reduced. It will be resolved. Therefore, the service life of the first flexible pipes 34a and 34b can be extended.

  In the above-described embodiment, the temperature control water supply route to the movable molds 21 and 22 and the temperature control water recovery route from the movable molds 21 and 22 are each provided with only one system, A plurality of supply pipes 31a and return pipes 31b are formed in the fixed pipe 31, and swivel joints 32a and 32b, temperature control blocks 33a and 33b, and a first flexible pipe are provided for each of the supply pipes 31a and the return pipes 31b. Tubes 34a and 34b and second flexible tubes 35a and 35b can also be provided. In this way, by distributing the temperature-controlled water having a different water temperature for each supply pipe 31a, the temperature-controlled water adjusted to an appropriate temperature can be circulated for each of the movable molds 21, 22. Each movable mold 21 and 22 can be molded under optimum temperature conditions, and a good product can be manufactured efficiently.

  The present invention can be used for rotary injection molding for multicolor molding or multilayer molding.

4 Tail Stock 5 Fixed Die Plate 6 Tie Bar 7 Movable Die Plate 11 Rotary Table 12, 13 Support Roller 14, 15 Electric Servo Motor 16 Rotation Center Shaft 17 Bearing 18 Support Surface 19 Gear Surface 20 Mold Mounting Plate 21, 22 Movable Side Metal Mold 31 Fixed pipe 32a, 32b Swivel joint 33a, 33b Temperature control block 34a, 34b First flexible pipe 35a, 35b Second flexible pipe 41 First bracket 42 Long hole 43 Second bracket 44 Bolt 45, 46 Nut

Claims (2)

A tie bar spanned between the fixed die plate and the tailstock, a movable die plate that is guided by the tie bar and moves in the mold closing direction and the mold opening direction, and rotates on the movable die plate via a rotation center axis A disk-shaped rotary table that can be attached, a plurality of fixed-side molds attached to the fixed die plate, a plurality of movable-side molds attached to the rotary table, and a temperature on the movable-side mold. In a rotary injection molding machine equipped with a temperature control water piping structure for circulating water control,
The temperature adjusting water pipe structure includes a fixed pipe disposed in the rotation center shaft formed in a hollow, a swivel joint connected to an end of the fixed pipe, and swingable with respect to the rotary table. A temperature control block that is slidably attached, a first flexible pipe that connects the swivel joint and the temperature control block, and a second flexible pipe that connects the temperature control block and the movable mold. A rotary injection molding machine characterized by comprising:   The temperature control water piping structure includes a temperature control water supply route for supplying temperature control water to the movable mold and a temperature control water recovery route for recovering temperature control water returning from the movable mold. The rotary injection molding machine according to claim 1, comprising a plurality of systems.

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