JP4389393B2 - Injection molding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an injection molding apparatus that molds a molded product using, for example, a resin material, and effectively recycles a runner portion.
[0002]
[Prior art]
As shown in FIG. 5, the conventional injection molding apparatus is widely known as one that injects a molten material such as resin into a mold 150 to mold a molded product 200.
[0003]
More specifically, after the material injection, the runner portion 210 formed in the introduction passage 156 through which the material is introduced into the cavity 155 in the mold 150 is separated from the molded product 200 when the mold 150 is opened. It is made to slid on 180 and is collect | recovered by the runner collection | recovery box 190 installed in the lower side.
[0004]
The runner portion 210 stored in the runner collection box 190 is manually fed into a crusher 170 provided at an adjacent position when a predetermined amount is reached, and the runner portion 210 that has been thrown in is crushed. After that, recycled materials are mixed with new materials and recycled.
[0005]
[Problems to be solved by the invention]
However, since the runner unit 210 is charged by injection molding, foreign matter such as dust and dust is likely to adhere to the surface on the chute 180 or in the runner collection box 190, and the recycled material pulverized by the pulverizer 170 is mixed with the new material. When trying to recycle, for example, when the molded product 200 uses a light color such as white, the adhered foreign matter appears on the surface of the molded product 200 as black spots, and the appearance quality is impaired. It was in a situation where it was not possible to recycle and landfilled.
[0006]
In view of the above problems, an object of the present invention is to provide an injection molding apparatus that can ensure appearance quality and can recycle and use a runner part.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following technical means.
[0008]
In the first aspect of the invention, the mold (150) for melting the material and injecting it into the cavity (155), separating the runner part (210) from the molded article (200) to be molded and discharging it to the outside. When,
In an injection molding apparatus having a crusher (170) for crushing the discharged runner part (210) and mixing it with the material,
After the runner part (210) is discharged, the pulverizer (170) is disposed at a position where it is directly put into the interior.
The charging unit (172) of the pulverizer (170) is provided with opening / closing means (173) that opens only when the runner unit (210) is charged ,
The opening / closing means (173) is characterized in that the runner portion (210) opens simultaneously with being discharged from the mold (150) .
[0009]
Thereby, the runner part (210) can be directly charged into the pulverizer (170) simultaneously with the discharge, and the opening / closing means (173) provided in the charging part (172) of the pulverizer (170) 210) is closed when not charged, it is possible to prevent foreign matters such as dust and dirt from adhering to the runner portion (210) that is charged after injection molding. 200) can be recycled as a recycled material after pulverization without impairing the appearance quality.
[0010]
And since the runner part (210) can be directly put into the pulverizer (170) as described above, it is transferred to the pulverizer (170) when a predetermined amount of the runner part (210) is accumulated as in the prior art. Work is unnecessary and productivity can be improved.
In the invention according to claim 2, the mold (150) includes an extrusion pin (152) for discharging the runner part (210) to the outside,
The opening / closing means (173) is characterized in that the runner part (210) is opened simultaneously with the extrusion pin (152) being discharged from the mold (150).
The invention according to claim 3 is characterized in that the opening / closing means (173) is a shutter (173) that reciprocates to open and close the closing portion (172).
[0011]
In the invention described in claim 4 , the pulverization capacity of the pulverizer (170) is such that at least one runner part (210) can be pulverized within one cycle of the molding product (200). The crusher (170) itself can be set as a small one, and can be installed in a space corresponding to the runner collection box (190) for storing the runner part (210) as in the prior art. A compact injection molding apparatus can be obtained.
[0012]
In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description mentioned later.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention is shown in FIGS. The present embodiment is applied to an injection molding apparatus 100 that molds a resin molded product using a thermoplastic resin as a material. The resin molded product is a cooling axial flow fan used in a vehicle cooling device or the like.
[0014]
The injection molding apparatus 100 includes a material supply unit 101, a heating cylinder unit 140, a mold 150, and a pulverizer 170.
[0015]
The material supply unit 101 mixes a new resin material (here, polypropylene is the main material) and a recycled material obtained by pulverizing a later-described runner unit 210 at an arbitrary ratio into a heating cylinder unit 140. The supply tank is composed of a material tank 110, a mixer 120, and a cylinder supply suction hopper 130.
[0016]
The material tank 110 is a tank for storing a new resin material (hereinafter referred to as a new material). The material tank 110 is provided with a lid portion 111 for preventing entry of foreign matters such as dust and dust on the upper side and can be manually opened and closed. A new material is input and stored every predetermined time by an operator. In addition, this new material consists of what was produced | generated by the granular form about 2 to 3 mm in diameter.
[0017]
The mixer 120 mixes the new material and the recycled material generated by the pulverizer 170 described later at a predetermined ratio, and the suction hoppers 121 and 122 for new material and recycled material, It consists of weighing parts 124 and 125 for recycled material and a mixing tank 126.
[0018]
The new material suction hopper 121 has a suction tank 121 a and a hopper 121 b arranged vertically, and the suction tank 121 a is connected to the material tank 110 by a pipe 112. A valve body 121c made of an elastic member, for example, a rubber plate material is provided between the suction tank 121a and the hopper 121b. Normally, the suction tank 121a and the hopper 121b are opened so as to communicate with each other. And when the suction blower 123 mentioned later act | operates, it is made to close by the suction effect.
[0019]
The reclaimed material suction hopper 122 has the same configuration as the new material hopper 121, and is provided with a suction tank 122a and a hopper 122b above and below, and a valve body 122c interposed therebetween. .
[0020]
The suction tanks 121a and 122a are connected to suction pipes 121d and 122d that join at the valve 121g, and a suction blower 123 is provided downstream of the valve 121g.
[0021]
In addition, a level sensor 121e for detecting the upper end position of the new material that has been thrown in is provided on the lower side inside the new material hopper 121b. When the new material falls below the level sensor 121e, the timer 121f is provided. Thus, for a predetermined time, the valve 121g opens to the side where the suction pipe 121d and the suction blower 123 communicate with each other so that the suction blower 123 operates. Then, after the predetermined time has elapsed, the suction blower 123 is stopped, and the valve 121g is opened to the side where the suction pipe 122d and the suction blower 123 communicate with each other.
[0022]
Under the hoppers 121b and 122b, measuring parts 124 and 125 for new materials and recycled materials and a mixing tank 126 are provided, respectively. Both weighing parts 124 and 125 measure the respective materials put in from both hoppers 121b and 122b and put them into the mixing tank 126, and are composed of disks 124a and 125a and motors 124b and 125b, respectively. The material is put on the disks 124a and 125a from below the hoppers 121b and 122b, and is discharged to the mixing tank 126 by a separator (not shown) while rotating. Then, the input amount is adjusted in accordance with the set rotation speeds of the motors 124b and 125b. Here, the rotational speed of the motor 124b is set to be four times the rotational speed of the motor 125b, and the mixing ratio of the new material and the recycled material is 4 to 1.
[0023]
A level sensor 126a for detecting the upper end position of the mixed material is provided on the lower side of the mixing tank 126. When the mixed material falls below the position of the level sensor 126a, the timer 126b performs the above-described operation for a predetermined time. The motors 124b and 125b are operated.
[0024]
The cylinder supply suction hopper 130 has a configuration similar to that of the new material suction hopper 121, and a suction tank 131 and a hopper 132 are arranged vertically with a valve pair 133 interposed therebetween. The pipe 126c is connected to the mixing tank 126. The suction tank 131 is connected to a suction blower 137 by a suction pipe 134. The suction blower 137 is operated by a timer 136 based on a material upper end position detection signal of a level sensor 135 provided on the lower side inside the hopper 132. It operates for a predetermined time. And the lower side of the hopper 132 is made to be connected to the heating cylinder part 140 mentioned later.
[0025]
The heating cylinder part 140 is disposed on the main body part 102 of the injection molding apparatus 100, melts the material charged from the hopper 132, and injects it into a mold 150 to be described later. A screw 142 that repeatedly rotates and stops by a motor (not shown) is provided inside the horizontally long cylinder 141, and a heater 143 that melts the material is provided on the outer periphery of the cylinder 141. Further, a nozzle 144 through which molten material is injected is provided at the left end in the drawing. Then, a predetermined amount (a necessary amount for molding the molded product 200) of a predetermined pressure of material is injected from the nozzle 144 by a predetermined amount of rotational driving of the screw 142.
[0026]
The mold 150 is disposed at a position facing the heating cylinder portion 140, and its details are shown in FIG. 2, but a runner stripper plate 151, a fixed side mold plate 153, a movable side mold plate 154, an ejector. A plate 157 is provided. FIG. 2 shows a state where the mold is clamped.
[0027]
The runner stripper plate 151 is fixed to the fixed-side mounting plate 150a, and an introduction passage 156a formed so that a melted material is introduced into the center portion and the intermediate portion is constricted is provided. Further, an extrusion pin 152 is provided on the upper side of the introduction passage 156a, and is urged leftward in the drawing by the coil spring 152a.
[0028]
The fixed side mold plate 153 and the movable side mold plate 154 are provided with concave and convex portions corresponding to the outline of the molded product 200, and a space formed by the concave and convex portions when the two mold plates 153 and 154 are combined. Is a cavity 155. Further, the stationary side template 153 is provided with a branch introduction passage 156b branched into a plurality from the introduction passage 156a so as to communicate with the cavity 155 in a conical shape. Incidentally, since the axial fan as the molded product 200 has a plurality of blades, the number of branches of the branch introduction passage 156b is set to a number corresponding to the number of blades in order to uniformly fill the material.
[0029]
The ejector plate 157 is fixed to the movable-side mounting plate 150b, and is provided with a plurality of push-out pins 157a that are inserted into the movable-side mold plate 154 and come into contact with the cavity 155.
[0030]
The molded product 200 is molded by the heating cylinder unit 140 and the mold 150 as one cycle including clamping, material injection, cooling and holding, mold opening, separating the runner unit 210, and taking out the molded product 200. In this embodiment, the rotation is performed in about 50 seconds per cycle, and the heating cylinder part 140 and the mold 150 are operated as follows according to the molding cycle.
[0031]
First, as shown in FIG. 2, in the mold 150, the runner slipper plate 151, the fixed side mold plate 153, and the movable side mold plate 154 are in contact with each other, and the ejector pin 157 a of the ejector plate 157 is in contact with the cavity 155. Clamped. The melted material is injected into the cavity 155 from the nozzle 144 of the heating cylinder section 140 through the introduction passage 156a and the branch introduction passage 156b, and is cooled and held.
[0032]
Next, as shown in FIG. 3A, the space between the runner stripper plate 151 and the stationary side template 153 opens, and the runner portion 210 formed by the introduction passage 156a and the branch introduction passage 156b is formed in the cavity 155. The product 200 is cut off from the apex that forms a conical shape.
[0033]
Next, as shown in FIG. 3 (b), the push pin 152 slides to the left in the drawing by the coil spring 152a, and the runner portion 210 is cut off from the material side at the constricted position in the introduction passage 156a. 150 falls outside.
[0034]
Further, as shown in FIG. 3C, the movable side mold plate 154 slides further to the left in the drawing between the fixed side mold plate 153 and the movable side mold plate 154, and the ejector pin 157a is movable. By sliding to the right relative to the side mold plate 154, the molded product 200 is discharged from the mold 150 and taken out by a robot hand (not shown).
[0035]
Next, the pulverizer 170 which is the main part of the present invention will be described with reference to FIG.
[0036]
The crusher 170 has an arc shape in which a cross section of a plurality of cutters 174 and fixed blades 175 that are rotationally driven has a circular arc shape and a plurality of small diameter holes inside a container 171 having an input portion 172 that opens to spread outward. The blade 176 is provided and always operates while the injection molding apparatus 100 is operating, and the runner portion 210 is finely pulverized. Specifically, first, the runner portion 210 is roughly crushed by the cutter 174 and the fixed blade 175, and then further finely crushed by the cutter 174 and the arcuate blade 176, and dropped from the plurality of small diameter holes to the lower portion of the container 171. I have to.
[0037]
The crusher 170 is disposed immediately below the runner unit 210 being separated from the mold 150, and a shutter 173 serving as an opening / closing means is provided in the opening charging unit 172. The shutter 173 is connected to an actuator 161 that reciprocates in the direction perpendicular to the paper surface in the figure by air pressure, and opens and closes the input portion 172 by interlocking. (Specifically, an appearance as shown in FIG. 4 is assumed.) And, during the molding cycle of the molded product 200, the runner part 210 is separated and opened when it falls, The input unit 172 is closed. Specifically, out of the molding time of 50 seconds for one cycle of the molded product 200, the input unit 172 is opened for about 4 seconds when the runner unit 210 is cut off, and then closed for about 46 seconds.
[0038]
In addition, a pipe 177 connected to the suction tank 122a is provided on the lower side of the pulverizer 170, and the suction blower 123 is actuated by the timer 162, thereby regenerating the pulverizer 170. The material is sucked into the suction tank 122a.
[0039]
Further, the pulverizing ability of the pulverizer 170 is such that at least one runner portion 210 can be pulverized within the molding time (50 seconds) of one cycle of the molded product 200. The entire pulverizer 170 has been described in the prior art. Such a pulverizer that pulverizes a large amount of the runner portion 210 at a time is made small.
[0040]
The timer 162 gives priority to the suction blower 123 when a new material is sucked into the suction tank 121a, and is turned ON / OFF for each molding cycle of the molded product 200 in other cases. The pulverized recycled material is sequentially sucked into the suction tank 122a. More specifically, the suction blower is operated for 20 seconds in one cycle of 50 seconds, and the remaining 30 seconds are stopped.
[0041]
Next, the operation based on the above configuration will be described.
[0042]
The new material in the material tank 110 and the pulverized material in the pulverizer 170 are sucked into the suction tanks 121a and 122a by the suction blower 123, and put into the hoppers 121b and 122b. New materials and recycled materials are weighed from both hoppers 121b and 122b so as to have a predetermined ratio (4 to 1) by both metering portions 124 and 125, and are mixed in the mixing tank 126. The mixed material is sucked into the suction tank 131 by the suction blower 137 and put into the hopper 132. During this time, when the suction blowers 123 and 137 and the motors 124b and 125b of the weighing units 124 and 125 are in the hoppers 121b and 131 and the mixing tank 126, the upper end position of the material falls below the position of the level sensors 121e, 135 and 126a. Each timer 121f, 136, 126b is operated for a predetermined time, and the material is replenished from the upstream side.
[0043]
Next, the material is supplied from the hopper 132 into the cylinder 141 of the heating cylinder unit 140 and melted by the heater 143. A predetermined amount of material of a predetermined pressure is injected from the nozzle 144 into the cavity 155 through the introduction passage 156a and the branch introduction passage 156b of the mold 150 clamped by the rotationally driven screw 142.
[0044]
Then, after being cooled and held, when the mold 150 is opened, the runner portion 210 is separated from the molded product 200 and separated from the material side by the push pin 152. At this timing, the shutter 173 of the input unit 172 of the pulverizer 170 provided immediately below is opened by the actuator 161, and the runner unit 210 is input directly into the interior. Thereafter, the shutter 173 is closed by the actuator 161, and the runner unit 210 is crushed inside. The pulverized recycled material is sucked into the suction tank 122 a by the suction blower 123. The suction blower 123 is turned on and off by the timer 162 every molding cycle of the molded product 200.
[0045]
The effects of the present invention will be described based on the above configuration and operation.
[0046]
The runner unit 210 is separated from the mold 150 and discharged, and at the same time, the runner unit 210 can be directly input into the pulverizer 170 provided immediately below. The shutter 173 provided in the input unit 172 of the pulverizer 170 is opened only at the time of input. However, when it is not charged, it is closed, so that foreign matters such as dust and dirt can be prevented from adhering to the runner portion 210 that is charged after injection molding, and the appearance quality of the molded product 200 is impaired. It can be recycled as recycled material after grinding.
[0047]
Since the runner unit 210 can be directly fed into the pulverizer 170 as described above, it is not necessary to transfer to the pulverizer 170 when a predetermined amount of the runner unit 210 is accumulated as in the prior art, thereby improving productivity. it can.
[0048]
Furthermore, the pulverizing ability of the pulverizer 170 is such that at least one runner part 210 can be pulverized within the molding time of one cycle of the molded product 200, and the pulverizer 170 itself can be set as a small one. It can be installed in a space corresponding to the runner collection box 190 for storing the runner portion 210 as in the prior art, and a compact injection molding apparatus 100 can be obtained.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a configuration of the entire mold in a closed state.
3A and 3B show the relationship between the open / close state of the mold and the molded product and the runner part. FIG. 3A shows a state in which the runner part is cut from the molded product, FIG. 3B shows a state in which the runner part is discharged, and FIG. FIG. 4 is a cross-sectional view showing a state where a molded product is taken out.
FIG. 4 is an external perspective view showing the vicinity of a shutter of a pulverizer.
FIG. 5 is an overall configuration diagram showing a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 Injection molding apparatus 150 Mold 155 Cavity 170 Crusher 172 Input part 173 Shutter (opening / closing means)
200 Molded product 210 Runner part

Claims (4)

A mold (150) for melting the material and injecting it into the cavity (155), separating the runner part (210) from the molded article (200) to be molded and discharging it to the outside;
In an injection molding apparatus having a crusher (170) for crushing the runner part (210) and mixing it with the material,
The pulverizer (170) is disposed at a position where the runner part (210) is discharged directly after being discharged,
The charging part (172) of the pulverizer (170) is provided with opening / closing means (173) that opens only when the runner part (210) is charged ,
The opening / closing means (173) opens at the same time as the runner part (210) is discharged from the mold (150) to the outside . The mold (150) includes an extrusion pin (152) that discharges the runner part (210) to the outside.
  2. The injection according to claim 1, wherein the opening / closing means (173) opens simultaneously with the runner part (210) being discharged from the mold (150) to the outside by the push pin (152). Molding equipment.   The injection molding apparatus according to claim 1 or 2, wherein the opening / closing means (173) is a shutter (173) that reciprocates to open and close the insertion portion (172). The grinding capacity of the grinding machine (170) according to claim 1 claims, characterized in that the shall be grinding at least one of said runner portion (210) in one cycle of molding time of the molded article (200) Item 4. The injection molding apparatus according to any one of Items 3 .

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