JPH0550040A - Method for discharging pellet and equipment therefor - Google Patents

Abstract

PURPOSE:To obtain both a method for surely separating and discharging pellets discharged through a pelletizer from the other impurities and an equipment used therefor. CONSTITUTION:Dust removal and cooling are performed by suction of air. Thereafter, the suction air is pressurized and fed to the pellet cutting discharge chamber 51 of a pelletizer 5. Pellets P containing impurities D are force-fed into a pellet separation cylinder 6 from the cutting discharge chamber 51 and allowed to collide against a baffleplate 61 of the inside of the separation cylinder 6. Thereby pellets P having weight difference are separated from the other impurities D. Further, the inside of the pellet separation cylinder 6 is exhausted from the upper part thereof by a suction blower 8 with the flow rate larger than the flow rate of air fed to the charge chamber 51. Impurities D are directed to a dust removing filter 7 by the exhaust flow based thereon, absorbed and removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pellet discharging method and apparatus.

[0002]

2. Description of the Related Art A conventional pellet discharging apparatus for taking out pellets P manufactured by a pelletizer 5 to the outside and a pellet discharging method using this apparatus will be described with reference to FIG. In the casing of the pelletizer 5, an intake filter 1, an intake cooling device 3 for cooling the intake air by heat exchange, and an intake filter 1 are provided upstream of a pellet cutting / discharging chamber 51 in which pellets P are cut out by a rotary cutter. The intake dust removal cooling pressure feeding path including the fine filter 4 having higher filtration performance in this order is communicated. Further, a hollow column-shaped cyclone 106 provided with a cooling jacket 106A is arranged on the downstream side of the pellet cutting / discharging chamber 51, and the feed pipe 105 from the pellet cutting / discharging chamber 51 to this cyclone 106 is an inner wall of the cyclone 106. Penetrate in the tangential direction of. A suction blower 109 for discharging foreign matters is communicated with the upper portion of the cyclone 106, and a rotor 107 for discharging the pellets P is also provided at the lower end portion so as to seal the inside of the cyclone so as not to communicate with the outside air.
A rotary discharge device 107 including A and a casing 107B is provided with a cooling jacket 108.

Explaining the pellet discharging action of the above-mentioned device, the pellet P is fed from the feed pipe 105 into the cyclone 106 by the suction action of the suction blower 109. At this time, in addition to the complete pellet P, The miscut foreign particles D such as defective pellets and other dust are also sucked into the cyclone 106. Then, the foreign matter D such as relatively light weight is sucked up above the cyclone 106 and discharged to the exhaust side of the suction blower 109, and only the complete and relatively heavy pellet P is provided at the lower end of the cyclone 106. Rotating ejector 107
Rotor 107A part of the
It is discharged to the outside according to the rotation of 7A. Each of the cooling jackets 106A and 108 is a cooling device for preventing the temperature of the cyclone from rising due to a high temperature pellet immediately after manufacturing.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
When you want to take out product pellets with
However, there are the following problems. That is, (1) size
Good pellet P and other contaminants in Klong 106
Separation from the object D is tangential to the inner wall in the middle of the cyclone.
It is done only by the weight difference between the two introduced in
Therefore, it should be removed as contaminant D because it is quite incomplete.
Pellet scraps called floss and other debris
It is mixed in the let and taken out from the lower rotary discharge device 107.
(2) Pellet cutting discharge chamber 51
Pellet for sending pellets inside into cyclone 106
The suction transport is provided exclusively at the end of the device.
This is a form only performed by the suction action of the wind blower 109.
For this reason, the airtightness of the device is important. (3) Keeping this airtightness
A rotary ejector 107 is installed in the pellet take-out section for holding
Although often required, the rotor 107A and the cable are often
A minute clearance between the sing 107B and high temperature resin
Disappears due to the heat effect of the rotor 107A
By rotating in sliding contact with the casing 107B
The resulting metal powder may be mixed in the pellets.
(4) It is still high to be discharged to the rotary discharge device 107.
Pellets in the warm state re-fused, which caused a cycle
Ron 106 may adhere to the inner wall of the lower part and accumulate, etc.
There are some drawbacks.

[0005]

The present invention has been made in order to solve the above-mentioned problems, and it comprises a step of removing air from the intake air and cooling it and feeding it under pressure to a pellet cutting and discharging chamber of a pelletizer. A step of pressure-feeding pellets containing contaminants from the pellet cutting discharge chamber into the pellet separating cylinder to collide with a baffle inside the separating cylinder, and air fed from the upper part of the pellet separating cylinder to the pellet cutting discharge chamber. Pellet discharging method including a step of exhausting at a flow rate higher than a flow rate, and a step of separating the pellets and the impurities inside the pellet separating cylinder by the step and discharging only the pellets from a lower portion of the pellet separating cylinder. Is.

Further, according to the present invention, the pellet separating cylinder has a hollow columnar shape, the baffle plate is disposed substantially horizontally inside the pellet separating cylinder, and pellets containing impurities are pumped in the pellet separating cylinder substantially vertically upward. The pellet discharging method is characterized in that it is configured to collide with the baffle plate from below.

Further, the present invention is provided in communication with an upstream side of a pellet cutting / discharging chamber of a pelletizer for discharging pellets, and an intake dust removal cooling pressure feeding passage including an intake filter, a pressure blower and an intake cooling device, and the pellet. A pellet separating cylinder provided on the downstream side of the cutting and discharging chamber, having a hollow columnar shape, a baffle plate inside, and a discharging port at the bottom,
A pellet discharging device that communicates with the upper part of the baffle plate of the pellet separating cylinder, and has a dust removing device and a dust discharging passage provided in this order with a suction blower.

[0008]

[Function] Pellets or the like pressure-fed from the pellet cutting / discharging chamber collide with the baffle plate in the pellet separating cylinder to separate the pellets having different weights from other impurities, and flow upward in the pellet separating cylinder. By the exhaust, light contaminants are carried to the dust removal filter, and only the heavy non-defective pellets are gravity-dropped and discharged from the lower outlet of the pellet separating cylinder. Further, since the flow rate exhausted from the pellet separation cylinder is larger than the cooling intake air fed into the pellet separation cylinder, outside air flows into the pellet separation cylinder from the outlet, and the inflowing outside air is absorbed in the pellet separation cylinder. The light contaminants are more effectively conveyed to the dust removal filter by flowing upwardly through the exhaust gas and exhausting it, whereby the pellets and the contaminants are more reliably separated.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. On the upstream side of the pellet cutting / discharging chamber 51 of the pelletizer 5, an intake filter 1, a pressure blower 2, an intake cooling device 3 of a heat exchanger type, and a fine filter 4 capable of removing dust finer than the intake filter 1 are provided. The dust removal cooling pressure feeding path A that is included in sequence is continuously provided. Also, the pellet cutting discharge chamber 51
A feed pipe 52 is connected to the downstream side of the. Immediately downstream of the pelletizer 5, a hollow cylindrical pellet separating cylinder 6 is installed. A baffle plate 61 is arranged substantially horizontally in a slightly upper portion of the inside, and a guide cone 62 extending upward from the peripheral edge of the baffle plate 61 in a substantially conical shape is provided. The entire pellet separating cylinder 6 is covered with a cooling jacket 63, a discharge port 64 is opened at the lower end, and a foreign matter discharge path B including a dust filter 7 and a suction blower 8 in this order is connected to the upper end. Is provided. Here, the other end of the feed pipe 52 provided on the downstream side of the pellet cutting / discharging chamber 51 enters into the pellet separating cylinder 6 and extends vertically along the central axis position in the pellet separating cylinder 6 to obtain a baffle plate 61. There is an opening just below, facing upward. The outer peripheral region of the pellet separation cylinder 6 including the discharge port 64 is arranged in the dust-free clean chamber 9.

As an operating condition of the apparatus shown in FIG. 1, when the flow rate of the pressurized blower 2 is Q ₁ , the exhaust flow rate Q ₃ of the suction blower 8 located at the end of the foreign matter discharge passage B is set to be larger than Q _1. It is to be. The flow rate Q of the pellets P cut into the pellet cutting discharge chamber 51 by the rotary cutter is Q.
_The pressure blower 2 having ₁ is pressure-fed into the pellet separation cylinder 6 together with the foreign matters D such as floss and other dusts through the feed pipe 52, and collides upward with the baffle plate 61 in the pellet separation cylinder 6. Be done. At this time, the non-defective pellet P having a large weight is reflected downward, falls by gravity, and is continuously discharged and discharged toward the discharge port 64 from here. On the other hand, since the foreign matter D having a small weight has a small momentum acquired by the collision with the baffle plate 61, it is clearly separated from the non-defective pellet P and flows upward around the guide cone 62 without being largely reflected downward. The exhaust flow having the flow rate Q ₃ is carried to the dust removal filter 7, where it is absorbed and removed.

Further, since the flow rate Q ₃ exhausted from the pellet separating cylinder 6 is larger than the cooling intake air supplied to the pellet separating cylinder 6 at the flow rate Q ₁ , the discharge port 64 is connected to the inside of the clean chamber 9. Clean air flows in with a flow rate Q ₂ = Q ₃ −Q ₁ , and the outside air that has flowed in flows upward in the pellet separation cylinder 6 and is exhausted, so that the contaminant D is filtered more reliably. Discharge towards device 7,
As a result, only good quality pellets are separated and taken out.

[0012]

According to the present invention, the non-defective pellets can be reliably separated from the other non-defective pellets by causing the pellets containing the contaminants to collide with the baffle plate in the pellet separating cylinder so that only the non-defective pellets can be taken out. Moreover, since the pellets in the pellet cutting and discharging chamber are pressure-fed into the pellet separating cylinder by the pressure blower, there is no need for a rotary rotary discharging device having airtightness as in the conventional apparatus, and the rotary pellet discharging device is also available. Since it is unnecessary, it is possible to eliminate the situation where metal powder is mixed in the product pellets, and it is possible to solve the problem of re-fusion of the pellet resin in the rotary discharge device portion that often occurs in the past.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an example of a situation in which the present invention is implemented.

FIG. 2 is a side sectional view similar to FIG. 1 of the prior art.

[Explanation of symbols]

 1 intake filter 2 pressurized blower 3 intake cooling device 4 fine filter 5 pelletizer 51 pellet cutting discharge chamber 6 pellet separation cylinder 61 baffle plate 64 discharge port 7 dust removal filter device 8 suction blower A intake air dust removal cooling pressure transmission route B foreign matter discharge route

Claims (3)

[Claims] 1. A step of depressurizing and cooling the intake air and feeding it under pressure to a pellet cutting discharge chamber (51) of a pelletizer (5), and a pellet containing a contaminant (D) from the pellet cutting discharge chamber (51). (P) is forced into the pellet separating cylinder (6) to collide with the baffle plate (61) inside the separating cylinder (6); and from above the pellet separating cylinder (6),
The step of exhausting at a flow rate higher than the flow rate of the air sent to the pellet cutting and discharging chamber (51), and the step of separating the pellets (P) and the impurities (D) inside the pellet separation cylinder (6). And discharging only the pellets (P) from the lower part of the pellet separating cylinder (6). 2. The pellet separating cylinder (6) has a hollow columnar shape, the baffle plate (61) is arranged substantially horizontally inside the pellet separating cylinder (6), and the pellet (P) containing a contaminant (D) is the pellet separating cylinder. The pellet discharging method according to claim 1, wherein (6) is pressure-fed vertically upward and is configured to collide with the baffle plate (61) from below. 3. A pelletizer (5) for discharging pellets (P), which is provided in communication with an upstream side of a pellet cutting discharge chamber (51), and which is provided with an intake filter (1, 4), a pressure blower (2) and An intake dust removal cooling pressure feed path (A) including an intake air cooling device (3) and a baffle plate (61) provided in a downstream side of the pellet cutting and discharging chamber (51) and having a hollow columnar shape.
, But also communicates with a pellet separating cylinder (6) having a discharge port (64) in the lower part and an upper part of the baffle plate (61) of the pellet separating cylinder (6) to remove a dust filter (7) and suction. A pellet discharge device having a blower (8) and a contaminant discharge path (B) provided in this order.