JPH06170262A - Pulverizer and cleaning method - Google Patents

Abstract

PURPOSE:To provide a pulverizer where cleaning is performed in a short time and the residual material to be pulverized is made as little as possible. CONSTITUTION:In a pulverizer where crushing blades 24 for crushing scrap material, such as plastics and a grinding blade 28 for further grinding the crushed material which has been crushed by the crushing blades 24 which is located below the crushing blades 24 are rotatably contained in a casing 15, jet holes 31 for jetting compressed air in the outer peripheral direction of the crushing blades 24 and compressed air introducing paths 30 formed in rotating shafts 26 of the crushing blades 24 are connected. And a fixed jet hole 34 for jetting compressed air toward a space 38 between the crushing blades 29 and the grinding blade 28 is made in the casing 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crusher and a method for cleaning the same, and more particularly to a crusher for crushing scrap material such as plastic between a crushing blade of a predetermined thickness mounted on a rotary shaft and a casing wall surface. Machine and its cleaning method.

[0002]

2. Description of the Related Art Scrap materials such as sprues and runners are generated during injection molding and the like. These scrap materials are usually crushed by a crusher in which one or a plurality of crushing blades are rotatably housed in a casing, mixed in small amounts with a raw material, and reused. In such injection molding work,
There are operations such as switching the raw materials used and exchanging dies. At this time, the inside of the crusher is also cleaned so as to discharge the residual crushed material remaining inside the crusher to the outside of the machine. Conventionally, the cleaning of the crusher has been performed by manually inserting a compressed air hose from an inlet or an outlet, or by removing the casing and blowing compressed air to the crushing blade, the casing wall surface, or the like. Furthermore, the scrap material generated when the switching of raw materials, etc. is completed and injection molding is restarted is discharged without reuse, and the residual crushed material in the crusher is completely replaced, and then crushed. Reuse things.

[0003]

Even with conventional manual cleaning, residual pulverized material remaining inside the pulverizer can be removed to some extent. However, in the manual cleaning work, the time required for the cleaning work is long, and dust scattering and the like due to the compressed air blowing also pose a problem.
Further, since the crushing blade is rotatably provided in the casing, there is always a gap between the crushing blade and the wall surface of the casing. On the other hand, since the crushing blade rotates to crush the plastic material, the crushed material remains in the gap between the crushing blade and the casing wall surface. However, compressed air cannot be directly blown to this gap, and even if the inside of the crusher is cleaned, the crushed material is likely to remain in the gap between the crushing blade and the casing wall surface. Therefore, when the injection molding is restarted after the switching operation of the used raw materials is completed, it is necessary to lengthen the discharge time of the crushed material of the scrap material, which deteriorates the yield of the raw material. Moreover, the released pulverized product cannot be reused, and its handling is also a problem.

Further, in recent years, the crusher has been integrated with the injection molding machine and has been operated in conjunction with the injection molding machine. For this reason, it is not possible to take an independent time for cleaning the crusher, and it is necessary to perform the cleaning work during the period when the injection molding machine is stopped in the raw material switching work or the like. Therefore, it has become impossible to manually clean the crusher for a long time. Therefore, an object of the present invention is to provide a crusher that can perform cleaning in a short time and can reduce residual crushed material as much as possible, and a cleaning method therefor.

[0005]

Means for Solving the Problems In order to achieve the above-mentioned object, the present inventors have found that if compressed air can be blown directly into the gap between the crushing blade and the casing wall surface, the gap between the crushing blade and the casing wall surface can be improved. We repeatedly considered that the pulverized material remaining in the powder could be blown out. As a result, by rotating the crushing blade while ejecting compressed air from the outer peripheral surface, the compressed air can be directly blown into the gap between the crushing blade and the casing wall surface, and the amount of crushed material remaining in the crusher after cleaning can be reduced. And has reached the present invention.

That is, according to the present invention, in a crusher in which one or a plurality of crushing blades are rotatably housed in a casing and crushes scrap material such as plastic, at least one outer peripheral surface of the crushing blades is provided. The crusher is characterized in that an injection hole that is opened to inject compressed air in the outer peripheral direction of the crushing blade and a compressed air communication path formed in the rotating shaft of the crushing blade are connected. Further, the present invention, a crushing blade for crushing the scrap material such as plastic that has been thrown in, and a crushing blade for further crushing the crushed material crushed by the crushing blade are rotatably provided in the casing. In the housed crusher, an injection hole that is opened in the outer peripheral surface of the coarse crushing blade and injects compressed air in the outer peripheral direction of the coarse crushing blade, and a compressed air communication path formed in the rotating shaft of the coarse crushing blade. And a fixed injection hole for injecting compressed air toward the gap between the coarse crushing blade and the fine crushing blade is provided in the casing wall surface in which the coarse crushing blade and the fine crushing blade are housed. It is also a crusher characterized by. Further, the present invention is a crusher for crushing scrap materials such as plastics that have been thrown in by one or more crushing blades housed in a casing and rotating, and discharging the crushed material from the discharge port of the collector. When cleaning the inside of the crushing blade, the crushing blade is connected to a compressed air passage formed in at least one rotation shaft of the crushing blade and jets compressed air from an injection hole opened on the outer peripheral surface of the crushing blade. A method for cleaning a crusher is characterized in that the blade is rotated and the discharge port of the collector is sucked to discharge the residual crushed material to the outside of the machine.

[0007]

According to the crusher of the present invention, since the compressed air is jetted from the outer peripheral surface of the rotating crushing blade, the compressed air can be directly blown into the gap between the crushing blade and the casing wall surface and remains in the gap. The amount of residual pulverized material can be reduced. Further, since the crushing blade ejects compressed air while rotating, the ejection direction of the compressed air also rotates, and residual pulverized material remaining in other parts of the casing can also be ejected toward the discharge port. Combined with the direct blowing of compressed air into the gap between and, the residual pulverized material remaining in the pulverizer can be reduced as much as possible.

[0008]

The present invention will be described in more detail with reference to the drawings. FIG. 1 is a partially cutaway front view showing an embodiment of a crusher according to the present invention. The crusher 10 shown in FIG. 1 is provided with a crusher main body 14 in which a crushing blade is housed below a hopper 12 for throwing in scrap materials such as sprues and runners, and further below the crusher main body 14 a collector. 16 is attached. Further, the crusher 10 is provided with a control board 18 for controlling the rotation of the crushing blade and the like. A sectional view of the hopper 12 and the crusher main body 14 shown in FIG. 1 is shown in FIG. Baffle plates 21 and 22 are provided in the hopper 12 of this embodiment to prevent the crushed material from jumping out of the crusher main body 14. This crusher body 14 has a crushing blade,
A pair of coarse crushing blades 24, 24 rotating in the direction of arrow A and a fine crushing blade 28 rotating in the direction of arrow C are housed in the casing 15. There are gaps 25, 25 between each of the roughly crushing blades 24, 24 and the inner wall surface of the casing 15. In the coarse crushing blade 24 of the present embodiment, a plurality of blade portions 23 are alternately mounted in the longitudinal direction of each rotary shaft 26 with liners (not shown). The fine crushing blade 28 is provided below the coarse crushing blades 24, 24, and
This is a crushing blade for further crushing the coarsely crushed product obtained by No. 4 into a finely crushed product. The crushing blade 28 is a screw-shaped crushing blade, and crushes between the crushing blade 28 and the fixing member 17 fixed to the casing 15. Further, a collector 16 is provided below the crushing blade 28, and the crushed material crushed by the crushing blade 28 is discharged to the outside of the crusher 10.

In the crusher main body 14 of the present embodiment, the compressed air passages 30 and 30 provided near the central portions of the rotary shafts 26 and 26 of the coarse crushing blades 24 and 24, and the coarse crushing blade 24,
The injection holes 31, 31 penetrating the inside of 24 are connected. From the injection holes 31, 31, coarse crushing blades 24, 24
Since compressed air is injected in the outer peripheral direction of the
A gap 25 formed between the wall surface of the casing 15 and the wall surface of the casing 15,
The crushed material accumulated in 25 can be cleaned. In the coarse crushing blade 24 of the present embodiment, the plurality of blade portions 23 are alternately attached to the liner in the longitudinal direction of the rotary shaft 30, so that the injection hole 31 is provided so as to penetrate through the blade portion 23. The opening position of the injection hole 31 provided in each blade portion 23 may be different for each blade blade 24, or may be the same position. Further, in the crusher main body 14, as shown in FIG. 2, a gap 38 between the coarse crushing blades 24, 24 and the fine crushing blade 28 is formed. In this gap 38, the coarse crushing blade 24
Even if the compressed air is blown from the outside, the compressed air cannot be blown and the pulverized material accumulated in the void 38 cannot be easily removed. In this regard, in the present embodiment, the coarse crushing blade 24
By injecting the compressed air from the injection hole 31 while rotating, the compressed air can be directly blown into the gap 38.

Further, in this embodiment, the fixed compressed air injection hole 34 capable of directly injecting compressed air into the space 38 is provided.
It is provided in the casing near the crushing blade 28. The fixed compressed air injection hole 34 is provided with an injection port for directly injecting compressed air into the space 38 and an injection port for injecting compressed air toward the gap 25. As described above, in the present embodiment, the gap 25 and the gap 38 in which the pulverized material is likely to be accumulated and which is difficult to clean.
The compressed air injected from each of the injection hole 31 provided in the coarsely crushing blade 24 and the fixed compressed air injection hole 34 provided in the casing 15 is directly blown into and can clean the accumulated pulverized material. . In the crusher 10 of this embodiment, the hopper 12 and the casing 15 are provided with a plurality of compressed air jet nozzles. First, in the hopper 12,
Immediately below each of the baffles 21 and 22, a compressed air injection nozzle 32,
33 is provided. The compressed air jet nozzles 32, 33
Each of which is provided with an injection port for injecting compressed air toward the baffle plates 21, 22 immediately above and an injection port for injecting compressed air in the direction of the coarse crushing blades 24, 24, and the back surface of the baffle plates 21, 22 and The coarse crushing blades 24, 24 are cleaned.

Further, the casing 15 is provided with a compressed air injection nozzle 36 for injecting compressed air toward the crushing blade 28,
The compressed air is directly jetted to the crushing blade 28. Further, the crushing blade 28
As shown in FIG. 3, the compressed air B ejected from the compressed air injection nozzle 42 provided in the discharge port 40 of the collector 16 is blown on, and in combination with the compressed air from the compressed air injection nozzle 36,
The crushing blade 28 and the collector 16 are cleaned.
As shown in FIG. 4, the crusher 10 shown in FIGS. 1 to 3 is integrally connected to the injection molding machine 100 to form an injection molding system. In the injection molding system shown in FIG. 4, when the injection molding machine 100 is performing injection molding, scrap materials such as sprues and runners generated in the injection molding machine 100 are crushed by the crusher 10 to obtain fine particles. Opened and closed valve 10
The raw material supplied from the raw material supply pipe 104 via 8 is mixed with the raw material and supplied to the hopper 102.
00. On the other hand, when the injection molding machine 100 is stopped due to a raw material switching operation or the like, the crusher 10 is subjected to a cleaning operation, and the discharged crushed material is discharged to the tank 106. During this cleaning operation, the open / close valve 108 is closed.

FIG. 5 shows the cleaning operation of the crusher 10 in the injection molding system shown in FIG. As shown in FIG. 5, when the injection molding machine 100 performs the production A using the raw material A and then the production B using the raw material B, for the work of switching the raw material and the work of exchanging the mold, etc. There is a fixed period of outage. Meanwhile, the crusher 10 is cleaned. In this cleaning operation, the injection molding machine 100 performs the forced discharge operation of the molten resin and the like in the injection cylinder immediately before the completion of the production A, so the crusher 10 also stops the recycling of the crushed crushed material and stores it in the tank 106. To force discharge.
Then, after the injection molding machine 100 is stopped, after performing a series of cleaning operations on the crusher 10, the related members such as the supply hose for supplying the scrap material to the crusher 10 are cleaned,
Again, the series of cleaning operations is performed. Further, in the injection molding machine 100, after the production B using the raw material B is restarted, the whole amount of the crushed material obtained by crushing the scrap material generated in the injection molding machine 100 within a certain period is forcibly discharged to the tank 106. This forced discharge is to replace the residual pulverized material in the pulverizer 10 with the pulverized material obtained by pulverizing the scrap material of the production B. After that, a series of cleaning operations are performed again, and the recycling of the crushed material is restarted.

FIG. 6 shows such a series of cleaning operations. First, after the compressed air is injected from the compressed air injection nozzles 32 and 33 of the hopper 12 to clean the inside of the hopper 12,
The compressed air is jetted from the jet hole 31 of the coarse crushing blade 24 to clean the gap 25. Next, after the compressed air is ejected from the fixed compressed air ejection hole 34 to clean the gap 25 and the gap 38, the comminuted blade 28 is cleaned by the compressed air ejected from the compressed air ejection nozzle 36, and further the compressed air ejection nozzles 36, 4
The crushing blade 28 and the inside of the collector 16 are cleaned with the injection pressure air from 2. In the present embodiment, the cleaning is performed in the direction from the upper member to the lower member sequentially, and by providing a time difference between the start time of the compressed air injection for cleaning the upper member and the compressed air injection for cleaning the lower member, The crushed material is prevented from reattaching to the upper member as much as possible. Further, the cleaning efficiency can be improved by providing a period in which the rotation directions of the coarse crushing blade 24 and the fine crushing blade 28 are reversed during the series of cleaning operations. In this embodiment, a series of cleaning operation time is about 1 minute, and the operation is all automated.

According to the crusher 10 of this embodiment, the crusher 10 can be operated integrally with the automated injection molding machine 100, and the cleaning operation is automatically performed when the raw materials of the injection molding machine 100 are changed or the molds are replaced. It can be performed. Moreover, the compressed air can be directly blown to a place where it is difficult to blow the compressed air directly from the outside, and sufficient cleaning can be performed. As described above, in this embodiment,
The casing 15 shown in FIG. 2 may be opened and closed, and when the injection molding machine 100 is stopped for a long time, the casing may be opened so that the crushing blade can be manually cleaned. Further, the crusher 10 of the present embodiment has the coarse crushing blades 24, 24.
Although the compressed air injection function is imparted only to the crushing blade 28, a compressed air communication path and an injection hole may be provided in the crushing blade 28 to impart the compressed air injection function. Further, it is needless to say that even in a uniaxial type crusher having one crushing blade, the crushing blade may be provided with a compressed air communication path and an injection hole to impart a compressed air injection function.

[0015]

According to the present invention, the crusher can be cleaned in a short time and can be used in conjunction with the injection molding machine. Therefore, automatic switching of the molding material of the injection molding machine,
The recycling of scrap materials can be automated.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a crusher according to the present invention.

FIG. 2 is a sectional view of the crusher shown in FIG.

FIG. 3 is a cross-sectional view showing a mounted state of a compressed air jet nozzle provided in a collector.

FIG. 4 is an explanatory diagram for explaining an injection molding system of injection molding and a crusher.

FIG. 5 is a process diagram for explaining the relationship between an injection molding machine and a crusher.

FIG. 6 is a process diagram for explaining a cleaning operation of the crusher.

[Explanation of symbols]

 10 Crusher 15 Casing 24 Coarse Crushing Blade 26 Rotating Shaft 28 Crushing Blade 30 Compressed Air Conducting Path 31 Jet Hole 34 Fixed Injection Hole 38 Gap between Coarse Crushing Blade 24 and Crushing Blade 28

Claims (3)

[Claims] 1. A crusher having one or a plurality of crushing blades rotatably housed in a casing and crushing scrap material such as plastic, wherein at least one of the crushing blades is opened at the outer peripheral surface and crushed. A crusher characterized in that an injection hole for injecting compressed air in the outer peripheral direction of the blade is connected to a compressed air conducting path formed in the rotation shaft of the crushing blade. 2. A coarse crushing blade for roughly crushing the scrap material such as plastic that has been thrown in and a fine crushing blade for further crushing the coarsely crushed material crushed by the coarse crushing blade are rotatably housed in a casing. In the crusher that is used, an injection hole that is opened in the outer peripheral surface of the coarse crushing blade and injects compressed air in the outer peripheral direction of the coarse crushing blade, and a compressed air communication path formed in the rotating shaft of the coarse crushing blade are provided. A fixed injection hole that is connected and injects compressed air toward the gap between the coarse crushing blade and the fine crushing blade is provided in the casing wall surface in which the coarse crushing blade and the fine crushing blade are housed. Characterizing crusher. 3. A crusher for crushing scrap material such as plastic, which has been put in, by one or a plurality of crushing blades housed in a casing and rotating, and discharging the crushed material from a discharge port of a collector. When cleaning the inside, the crushing blade is connected to a compressed air passage formed in at least one rotary shaft of the crushing blade and ejects compressed air from an injection hole opened on the outer peripheral surface of the crushing blade. A cleaning method for a crusher, characterized in that the residual crushed material is discharged to the outside of the machine by suctioning the discharge port of the collector.