JPH06344382A - Purge treatment device of injection molding machine - Google Patents

Abstract

PURPOSE:To prevent the stagnation and sticking of a resin after injection so as not to obstruct usual injection molding by erecting a conveyor accompanied by the advance of the movable stand arranged under a nozzle to oppose the same to the front of the nozzle so as to cover the opening part of a fixed plate and spraying a fluid to the conveyor by a sprayer. CONSTITUTION:A movable stand 30 has a box shape opened forwardly and is positioned under the heating cylinder 3 of an injection molding machine so as to be movable in the center axial line direction of the heating cylinder 3. The movable stand 30 is equipped with the drive drum 23a of a conveyor 23 and the rotary drive source of the drum 23a. A follower drum 23e having a support shaft 23d is provided to the other end part of the conveyor 23 and a stretch forming device 23g such as a belt is trained over both drums 23a, 23e. The support shaft 23d of the follower drum 23e are engaged with the slits 22a extending in an up-and-down direction of the guide members 22 erected on both sides of the opening part 1a of a fixed plate 1 and a sprayer 28 is provided to spray a fluid on the upper surface of the conveyor 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purge processing apparatus for an injection molding machine.

[0002]

2. Description of the Related Art In an injection molding machine, materials and colors (purging) can be changed without changing a heating cylinder and a screw.
In this case, the plasticizing and injecting steps are performed a plurality of times to discharge the previously melted material in the injection molding machine. In pursuit of automation of the injection molding system, processing of the purged molten material at the time of material change and color change has become an important issue, and some have been proposed so far. For example, Japanese Patent Fairness 5
No. 6091 discloses the following automatic purging material processing apparatus. That is, the purging resin injected from the nozzle is received by the backing plate installed on the front of the nozzle and dropped downward, guided by the funnel-shaped upper gutter installed below, and then installed below the upper gutter. Compress and cut with the stepped meshing roller and meshing roller.

[0003]

However, in such a conventional purge processing apparatus for an injection molding machine, the backing plate that receives the molten purge resin is overheated due to the heat of the purge resin. By repeating the purging intermittently, the purging resin may adhere to the backing plate and coagulate as it is. Further, it is difficult for the purge resin that has once formed into an agglomerate on the backing plate to pass through the funnel-shaped upper gutter and be caught by the lower stepped engagement roller.
Further, in this purging device, the surface of the stepped meshing roller, meshing roller, etc. is coated with an ethylene tetrafluoride resin to prevent the purge resin from sticking. The decline is inevitable.

[0004]

The present invention has been made in view of the above-mentioned conventional technical problems, and the structure thereof is as follows.
It is as follows. According to the invention of claim 1, the guide member 22 is provided upright on both sides of the opening 1a of the fixed plate 1 of the injection molding machine, and the guide members 22 are formed with the vertical guide portions 22a, respectively, and the central axis of the nozzle 2 of the injection molding machine. And a conveyer 23 arranged below the nozzle 2 so as to be movable in any direction.
And a jetting device 28 for jetting a fluid onto the conveyer 23, and the conveyer 23 is rotated by the driven drum 23e having an engaging portion 23d engaging with the pair of the guide portions 22a and the movable table 30. It has a drive drum 23a that is freely supported and is driven to rotate by a rotary drive source 23c, and a wrapping tool 23g that is wound between the drive drum and a driven drum, and has a pair of engaging portions 23d. The purging device for an injection molding machine is characterized in that the winding tool 23g faces the nozzle 2 when the driven drum 23e side of the conveyor 23 is guided by the guide portion 22a and is raised. According to the second aspect of the present invention, the roller 24 for compressing the purged molten material which is carried on the conveyor 23 and is conveyed between the conveyor 23 and the movable table 30.
The purge processing apparatus for an injection molding machine according to claim 1, wherein the purge processing apparatus is rotatably provided. The invention of claim 3 is
3. The purge processing apparatus for an injection molding machine according to claim 2, wherein a plurality of protrusions 25 in the direction of the rotation axis for cutting the purge molten material with the conveyor 23 are formed on the roller 24. . According to a fourth aspect of the present invention, each protrusion 25 of the roller 24 is formed with a notch 26 located on the same circumference, and a cutter 32 rotatably supported by a movable base 30 is provided with the notch. The purge processing apparatus of the injection molding machine according to claim 3, wherein the purge processing apparatus is engaged with the portion 26.

[0005]

According to the first aspect of the invention, when the material is changed or the color is changed in the injection molding machine, the movable table 30 is moved forward after the nozzle 2 is moved backward. As a result, the engaging portion 23d is moved upward while being guided by the guide portions 22a of the pair of guide members 22, and the conveyor 23 is gradually raised. When the conveyor 23 moves so as to cover the opening 1a of the fixed platen 1 and face the front side of the nozzle 2, the forward movement of the movable table 30 is stopped. Next, the rotary drive source 23c
Thus, the conveyor 23 is driven and the purging work is started. The molten material ejected from the nozzle 2 of the injection molding machine collides and lands on the conveyor 23. The molten material having collided and landed on the conveyor 23 rides on the conveyor 23 and is forcibly transferred downward.

In the processing of such purged molten material,
A fluid such as water or air is ejected from the ejector 28 onto the conveyer 23 to prevent overheating of the conveyer 23 due to the purge melted material and accompanying sticking of the melted material to the winding tool 23g and sticking of the melted materials together. Has been done. After the predetermined number of purges is exhausted, the rotation of the conveyor 23 is stopped and the movable table 30 is retracted. Thereby, the engaging portion 23
d is guided to the guide portion 22a and gradually moved downward,
The conveyor 23 is gradually returned to the horizontal position, and the opening 1a of the fixed board 1 is opened. In this way, the opening 1a of the fixed board 1 is opened, and the conveyor 23 is returned to the horizontal state.
Is located below the heating cylinder 3 of the injection molding machine, so that it does not interfere with the normal injection stroke of the nozzle 2 of the injection molding machine. Thus, the purge processing operation is completed.

According to the second aspect of the invention, the roller 24 is driven together with the conveyor 23. The purge molten material reaches the rollers 24 while being sent to the conveyor 23,
And a roller 24 are formed into a sheet shape and sent out. Particularly, if water droplets are sprayed from the ejector 28, not only the purge molten material and the conveyer 23, but also the molten materials are not only prevented from adhering, but also interposed between the rollers 24, The adhesion between the roller 24 and the purged molten material is prevented, and the purged molten material is encouraged to fall. After the predetermined number of purges has been exhausted, the rotation of the conveyor 23 and the rollers 24 is stopped, and the movable table 30 is retracted.

According to the invention of claim 3, the roller 24 is provided with
Since a plurality of protrusions 25 in the direction of the rotation axis for cutting the purge molten material with the conveyor 23 are formed, the purge molten material reaching the roller 24 is formed into a sheet and then projected. Part 25 is a wrapping tool 2 of the conveyor 23
It is cut and separated in the up and down direction in cooperation with 3 g, and cut into strips having a shape easy to process thereafter. This protrusion 25 is
It also has a function of biting into the purge molten material sent by the conveyor 23 and sending it between the roller 24 and the conveyor 23.

According to the fourth aspect of the present invention, each projection 25 of the roller 24 is formed with a notch 26 located on the same circumference, and a cutter 32 rotatably supported by a movable table 30. However, since the purge molten material passes through between the conveyor 23 and the roller 24, it is cut into strips and the cutter 32 is engaged with the notch 26.
Cut into the notch portion 26, are cut and separated in the left-right direction, and become small pieces that are easier to process thereafter.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show a purge processing apparatus of an injection molding machine according to an embodiment of the present invention. Reference numeral 10 in the drawing
Indicates a purging device, and the purging device 10 is a rear side of the stationary platen 1 of the mold attached to the horizontal injection molding machine.
It is installed on bed 4. Reference numeral 6 denotes a tie bar of the fixed platen 1. The purge processing apparatus 10 includes a movable table 30 arranged on a pedestal 20 provided on the bed 4, and the movable table 30 is
It has a box shape with an open front side, is located below the heating cylinder 3 of the injection molding machine, and can be moved by wheels 21 in the central axis direction of the heating cylinder 3. That is, as shown in FIG. 6, the traveling motor 21a installed on the movable table 30 rotationally drives the wheels 21 in the forward and reverse directions through the reduction gear device 21b, whereby the movable table 30 reciprocates.

As shown in FIGS. 3 and 6, the movable base 30 has a drive drum 23 of a conveyor 23 rotatably supported by support shafts 23b supported on both sides of the movable base 30.
a, a rotary drive source 23c such as a motor for rotationally driving the drive drum 23a, a roller 24 rotatably supported by a support shaft 24a, a roller motor 24c for rotationally driving the roller 24, and a support shaft 32a. The cutter 32 rotatably supported by the cutter 32 and the cutter 3 as shown in FIG.
And a motor 32b for a cutter that rotationally drives 2.

A driven drum 23e having a support shaft 23d as an engaging portion is provided at the other end of the conveyor 23, one end of which is supported by the movable table 30, and is wound between the drive drum 23a and the driven drum 23e. The hanging tool 23g is wound around, the support shaft 23d engages with the guide portion 22a formed of a slit extending in the vertical direction of the pair of guide members 22, and the pair of front and rear support shafts 23b and 23d forms the pair of spacing members 23f. Are separated by a predetermined distance. A belt is suitable as the wrapping device 23g. The pair of guide members 22 are erected on both sides of the opening 1a of the fixed board 1. Then,
When the movable table 30 moves forward (moves leftward in FIG. 1), the support shaft 23d gradually moves upward while being guided by the guide portion 22a, the conveyor 23 gradually stands up, and the opening 1a of the fixed plate 1 is gradually raised. Is moved so as to be covered by the wrapping tool 23g. The guide portion 22a of the guide member 22 is smoothly moved upward while the support shaft 23d is guided by the guide portion 22a by the forward movement of the movable base 30, so that the conveyor 23 can be tilted smoothly. It can also be formed in a curved line so as to draw a parabola as shown in FIG.

Further, as shown in FIGS. 4 and 5, the roller 24 is formed with a projection 25 in the direction of the rotation axis for cutting the purge molten material such as resin, and the projection 25 is a wrapping tool for the conveyor 23. It is arranged so as to contact with 23 g. Further, each protrusion 25 is formed with a notch 26 so as to be located on the same circumference. Further, a circumferential groove 24b is formed on the surface of the roller 24 so as to match the cutout portion 26. Then, the disk-shaped cutter 32 is arranged at the groove 24b. The cutter 32 is rotatably supported by the movable table 30, and is rotationally driven in the direction opposite to the rotation direction of the roller 24 by the cutter motor 32b as shown in FIG. After the conveyor 23 and the roller 24 cooperate with each other to compress the purged molten material, the protrusion 25 comes into contact with the wrapping tool 23g of the conveyor 23 and is cut and separated in the vertical direction to form a strip shape. After that, the cutter 32 bites into the notch portion 26 and the groove 24b, and is cut and separated in the left-right direction to become the small piece 17.

A scraper 27 for separating the purged molten material from the roller 24 is provided between the adjacent protrusions 25 of the roller 24. The scrapers 27 are inserted into the slit-shaped openings 24c in the central axis direction, which are formed in a plurality on both sides of the roller 24 in the circumferential direction, so that the scrapers 27 can be moved back and forth. Is being urged. A plurality of return-type scraper cylinders 34 are fixed to the movable base 30 so as to be fixed (two in the illustrated embodiment).
The scrapers 27 are pushed in against the elastic force of the springs 24d, so that the plurality of scrapers 27 are driven in the direction of the central axis of the roller 24, and the small pieces 17 of the purged molten material adhering to the surface of the roller 24 are peeled off. To do.

Therefore, the rollers 24 and the conveyor 23 are intermittently rotated so that the plurality of scrapers 27 are driven by the scraper cylinders 34, and the plurality of scrapers rotated to predetermined positions are rotated. The scraps 27 are successively pushed by the scraper cylinder 34, and the small pieces 17 of the purged molten material after being cut by the cutter 32 are individually peeled and dropped. With the return operation of the scraper cylinder 34, the plurality of scrapers 27 are returned to their original positions by the elastic force of the springs 24d.

Further, an ejector 28 is installed at the center of the upper ends of the pair of guide members 22 via a connecting member 28a. The ejector 28 is a conveyor 23 made of purged molten material.
Has a function of preventing the overheating and the adhesion of the molten material to the wrapping tool 23g and the adhesion of the molten materials with each other, and sprays the fluid toward the upper surface of the conveyor 23. This fluid is, for example, water, air, etc., and the ejector 28 sprays water droplets toward the upper surface of the conveyer 23, or blows air on the conveyer 2.
It spouts toward the upper surface of 3.

A carry-out conveyor 29 is arranged below the rollers 24 at the bottom of the frame 20, and the scraper 2
A small piece 17 of the purged molten material which is separated from the roller 24 and falls by 7 is received by the carry-out conveyor 29 and discharged to the outside.

Next, the operation of the above embodiment will be described. When the predetermined required quantity of molding by the injection molding machine 5 is completed and the material is changed and the color is changed, after the purge processing device 10 receives the backward movement completion signal of the nozzle 2, the wheels 21 are rotationally driven and moved forward to the movable table 30. Give move. As a result, the support shaft 23d gradually moves upward while being guided by the guide portions 22a of the pair of guide members 22, and the conveyor 23 gradually stands up as shown by the broken line in FIG. The conveyor 23 is shown in FIG.
As shown in (3), the opening 1a of the fixed platen 1 is covered and the nozzle 2 is moved so as to face the front side of the nozzle 2, and when it is appropriately inclined, the forward movement of the movable table 30 is stopped.

Next, in response to the purge start signal of the injection molding machine 5, the conveyor 23 and the roller 2 of the purge processing apparatus 10
4, the driving of the cutter 32 and the carry-out conveyor 29 is started respectively. The molten material ejected from the nozzle 2 by the purging function of the injection molding machine 5 collides and lands on the conveyor 23. The molten material having collided and landed on the conveyor 23 rides on the conveyor 23 and is forcibly transferred downward. The purged molten material transferred by the conveyor 23 and reaching the roller 24 is compressed between the conveyor 23 and the roller 24,
After being formed into a sheet, the protrusion 25 cooperates with the wrapping tool 23g of the conveyor 23 and is cut and separated in the vertical direction to form a strip. The protrusion 25 also has a function of biting into the purge molten material sent by the conveyor 23 and sending it between the roller 24 and the conveyor 23.

The cutter 32 cuts into the strip-shaped purge melted material into the notch 26 and the groove 24b,
It is cut and separated in the left-right direction to form a small piece 17. The purged molten material cut into the small pieces 17 is scraped off by the scraper 27 driven by the scraper cylinder 34. The small pieces 17 of the purged resin that have been stripped off are naturally dropped, and then drop onto the carry-out conveyor 29 installed below and are carried out of the injection molding machine 5.

In processing such a purge molten material,
A fluid such as water or air is ejected from the ejector 28 toward the upper end of the conveyor 23, and the purged molten material overheats the conveyor 23 and the resulting adhesion of the molten material to the wrapping tool 23g and adhesion between the molten materials. Is prevented. In particular, if water droplets are sprayed from the ejector 28, not only the melted purge material and the conveyor 23, but also the melted materials intervene to prevent sticking, and also the roller 24 intervenes. , The roller 24 and the small piece 17 are prevented from sticking to each other, and the small piece 1
It is also possible to omit the scraper 27 and the scraper cylinder 34 by spraying an appropriate amount of water droplets onto the purged molten material from the ejector 28, since the dropping of the scraper 7 is promoted.

After the predetermined number of purges has been exhausted, the signal from the injection molding machine 5 causes the conveyor 23, the rollers 24,
Stop the rotation of the cutter 32 and the conveyor 29 for carrying out,
The wheels 21 are driven to rotate in reverse, and the movable table 30 is retracted. As a result, the support shaft 23d gradually moves downward while being guided by the guide portion 22a, the conveyor 23 gradually returns to the horizontal position, and the opening 1a of the fixed board 1 is opened. In this way, since the opening 1a of the fixed platen 1 is opened, it does not hinder the normal injection stroke of the nozzle 2, and the conveyor 23 that has returned to the horizontal state is the heating cylinder 3 of the injection molding machine. Since it is located below, it does not interfere with the normal injection stroke of the injection molding machine 5. Thus, the purge processing operation is completed.

[0023]

As can be understood from the above description,
According to the purge processing apparatus of the injection molding machine of the present invention, the purge molten material injected from the nozzle of the injection molding machine is received by the conveyor cooled by the ejector and is forcibly sent. It eliminates the occurrence of sticking between the accumulated and molten materials. As a result, the material changing operation and the color changing operation in the injection molding machine become remarkably efficient, and the purging process becomes reliable, which is effective in automating the injection molding system. In addition, since the purging device is housed below the nozzle and the heating cylinder, it is possible to obtain a remarkable effect that it does not hinder the injection process during normal injection molding. Further, according to the invention of claim 2, if compressed by a conveyer and a roller, the lump-like purge molten material is formed into a sheet shape and sent out, and according to the invention of claim 3, it is obtained in a belt shape. The subsequent processing is easy. By forming a protrusion on the roller and attaching a cutter to the roller, a small piece that can be processed more easily can be obtained.

[Brief description of drawings]

FIG. 1 is a front view showing a purge processing apparatus of an injection molding machine according to an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an explanatory view of the same operation.

FIG. 4 is a perspective view showing a roller of the same.

FIG. 5 is a side view showing a roller and a cutter of the same.

FIG. 6 is a plan view showing a movable table.

FIG. 7 is a front view showing a structural example of a guide member.

[Explanation of symbols]

1: fixed plate, 1a: opening, 2: nozzle, 3: heating cylinder,
4: Bed, 10: Purge treatment device, 17: Small piece, 2
0: mount, 21a: wheels, 21b: reduction gear device, 2
2: guide member, 22a: guide part, 23: conveyor, 23
a: drive drum, 23c: rotary drive source, 23d: support shaft (engaging portion), 23e: driven drum, 23f: spacing member,
23 g: wrapping tool, 24: roller, 24 b: groove, 24
c: motor for roller, 25: protrusion, 26: notch,
27: scraper, 28: ejector, 29: unloading conveyor, 30: movable stand, 32: cutter, 32b: motor for cutter, 34: cylinder for scraper.

Claims (4)

[Claims] 1. An opening (1) of a fixed plate (1) of an injection molding machine.
a) a guide member (22) provided upright on both sides and having vertical guide portions (22a) formed respectively, and a nozzle (2) which is movable in the central axis direction of the nozzle (2) of the injection molding machine. ), A movable table (30), a conveyor (23), and an ejector (28) for ejecting a fluid onto the conveyor (23). A driven drum (23e) having an engaging portion (23d) that engages with the guide portion (22a) and a movable base (30) are rotatably supported by the rotary drive source (23c). The drive drum (23a) and the drive drum (2
3a) and a driven drum (23e), and a wrapping tool (23g) wound around the driven drum (23e), and the engagement portion (23d) is guided by the pair of guide portions (22a) to follow the conveyor (23). A purging device for an injection molding machine, characterized in that the winding tool (23g) faces the nozzle (2) when the drum (23e) side rises. 2. A movable table (30) is rotatably provided with a roller (24) for compressing the purged molten material carried on a conveyor (23) between the purge molten material and the conveyor (23). The purging apparatus for an injection molding machine according to claim 1. 3. A projection (25) in the direction of the axis of rotation for cutting the purged molten material with a conveyor (23),
The purge processing apparatus for an injection molding machine according to claim 2, wherein a plurality of rollers (24) are formed. 4. The protrusions (25) of the roller (24) are provided with
Notches (26) located on the same circumference are respectively formed, and a cutter (32) rotatably supported by a movable table (30) is engaged with the notches (26). The purge processing apparatus for an injection molding machine according to claim 3, wherein