JPS6232087B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an automatic dehumidifying and supplying device for dehumidifying synthetic resin raw materials and supplying the dehumidified raw materials to a molding machine.

[Conventional technology and its problems]

Synthetic resin raw materials are usually granular, but during molding,
High-quality molded products cannot be obtained unless the moisture in the raw materials is removed.

For this reason, conventionally, raw materials before molding are placed in shallow boxes with open tops, arranged on multi-tiered shelves of a dryer, and dried for 1 to 3 hours. For this reason, drying had to be started 1 to 3 hours before the start time, which required early arrival of personnel, and also caused problems such as large heat loss.

The purpose of this invention is to solve the above problems.

[Means for solving problems]

The measures taken to solve the above problem are as follows.

That is, it has a supply chute for undried synthetic resin raw materials at the rear end, an outlet for dry synthetic resin raw materials at the lower front end, and a hot air inlet at the center of the front end. A rotating drum rotated by a suitable drive device is provided, the inner end of the chute is inserted into the central opening of the rear end plate of the drum, and the front outer periphery of the drum is provided with a rotary drum for discharging the raw material dried in the drum. A plurality of holes are arranged at appropriate intervals, the hot air blowing port is exposed to the opening in the center of the front end plate of the drum, and a plurality of scraping plates for stirring raw materials are arranged on the inner surface of the peripheral wall of the drum. A plurality of perforated plates are arranged concentrically at appropriate intervals, and a raw material box for temporarily storing dry raw materials is provided at the bottom of the insulation box, and this raw material box is equipped with an air transport pipe that automatically supplies the dry raw materials inside. I installed it.

[Effect]

This effect is as follows.

When the rotary drum inside the heat insulating box is rotated and the undried synthetic resin raw material is introduced into the rotary drum from the supply chute, the raw material is repeatedly scraped up by the scraper plate and then dropped.

Since hot air is blown into the rotating drum from the hot air inlet in front of the rotating drum, the hot air comes into contact with the raw material that is repeatedly rising and falling due to the scraping plate inside the rotating drum, and the water in the raw material evaporates.

The raw material from which moisture has been removed in this way is discharged into the heat insulating box from a number of discharge ports provided on the outer periphery of the front part of the rotating drum, and is stored in the raw material box in the lower part of the heat insulating box.

Since an air transport pipe is attached to the raw material box, dry raw materials can be supplied to the resin molding machine through this air transport pipe.

In addition, a plurality of perforated plates are installed at regular intervals inside the drum along with a scraping plate, so the flow velocity of the hot air is moderately controlled by the resistance provided by the perforated plates, and the raw material inside the rotating drum is moved by the hot air. will no longer be blown back.

〔Example〕

Embodiments of the automatic dehumidifying supply device of the present invention will be described below with reference to the accompanying drawings.

In the figure, A is a heat insulating box, and this heat insulating box A has an open top main body 1 mainly made of heat insulating material as shown in Figure 3.
The heat insulating material is attached to the upper part of the heat insulating material by means of a hinge 2 so as to be openable and closable.The heat insulating material mainly consists of a lid 3, and has a lock fitting 4 for fixing this lid 3.

Reference numeral 5 in FIG. 2 is a supply chute for undried raw materials, and this chute 5 is provided approximately at the center of the rear end of the heat insulating box A.

In addition, 6 in FIG. 1 is a storage box for undried synthetic resin raw materials, and an ejector 7 is installed on the top of this box, its suction pipe 8 is inserted into the box 6, and an air transport pipe 9 connected to the outlet of the ejector 7 is It is connected to the inlet of a cyclone type hopper 10, and a screw feeder 11 at the lower end of the hopper 10 is connected to the chute 5.

A compressed air supply pipe 12 is connected to a compressed air source consisting of a compressor, a receiver tank, etc. (not shown), and this pipe 12 is connected to a solenoid valve via an air purifier and air reservoir 43 and a pressure reducing valve 13 1
4, and an air supply pipe 16 to the ejector 7 is connected to one outlet of the solenoid valve 14 via an air volume adjustment valve 15.

B is a rotating drum installed inside the insulation box A,
The cylindrical peripheral wall of the drum B is divided into a pair of drum members 17 with a semicircular cross section, one side edge of both members 17 is openably and closably connected by a shaft 18, and a flange is provided on the other side edge. This flange can be freely connected and separated using a plurality of bolts 19 or the like. Although the drum member 17 is made of a metal plate without holes, it may also be made of a perforated plate with a large number of small ventilation holes through which the raw material cannot pass.

After combining both drum members 17 to form a cylindrical peripheral wall, disc-shaped end plates 22 are installed at both ends of the peripheral wall.
23 is removably fixed using screws or other means, and the outer peripheries of these end plates 22 and 23 are made to protrude from the outer periphery of drum B to form flanges, and these flanges are used as a pair of flanges arranged on both the front and rear sides of box A. The drum B is rotatably supported by support rollers 20, and the pair of rollers 20 are driven by a drive device 21 comprising a motor, a speed reducer, etc., thereby rotating the drum B in the direction of the arrow in FIG.

The rear end plate 23 of the drum B has a second opening in the center.
Insert the front end of chute 5 as shown in the figure, and
A hot air inlet at the tip of the hot air duct 24 is fixed to the front center of the drum B, and this inlet is inserted into the center opening of the end plate 22 at the front of the drum B. This duct 24 is connected to a hot air generator 2 having a blower 25 as shown in FIG.
The air blower 26 is connected to the outlet of the air blower 26, and is heated by a heater in the air blower 26 and blown into the drum B.

Reference numeral 27 in FIGS. 2 and 3 indicates a plurality of scraping plates provided on the inner surface of the peripheral wall of the drum B, and each of these scraping plates 2
A plurality of perforated plates 28 made of disc-shaped metal steel are placed inside the 7th group.
Install drum B at regular intervals using appropriate mounting hardware.
and fixed concentrically.

Further, near the front end of the peripheral wall of the drum B, a large number of discharge ports 29 are provided as shown in FIG.
An outlet having a discharge pipe 30 is provided at the bottom of the main body 1 immediately below the main body 1 , and the lower end thereof is communicated with a dry raw material box 31 .

An ejector 32 is also arranged on the top of this raw material box 31, and its suction pipe 33 is inserted into the box 31, and the air transport pipe 24 connected to the outlet of the ejector 32 is
As shown in FIG. 1, it is connected to the inlet of the cyclone type hopper 35 of the resin molding machine C.

Further, an ejector 3 is connected to the other outlet of the solenoid valve 14 via an air volume adjustment valve 36 and an air cleaner 37.
Connect the air pipe 38 to 2.

Reference numeral 39 in FIG. 1 is a detection switch that is opened and closed by the movable part of the molding machine C. This switch 39 is inserted into the power supply circuit of the synchronous timer 40, and
is activated when the switch 39 is closed, opens the solenoid valve 14 for a set time, and rotates the drive device 41 of the screw feeder 11. In addition,
The lid 3 of the heat insulation box A is provided with an exhaust port 42. Also,
The small air cleaner/air reservoir 43 serves as an air reservoir for dehumidifying and purifying the air and accumulating air volume when transporting dry raw materials to the resin molding machine. That is,
When the nozzles of the two ejectors 7 and 32 are fully opened at the same time, the pressure inside the air supply pipe drops rapidly and the air volume is insufficient, so the pressure is accumulated as a source air reservoir to ensure the air volume for the several seconds the ejectors are operating. is necessary. The purpose of the air purifier 37 is to clean the secondary air at the end, and the removal of oil and moisture from the transport air must be adequately controlled due to the nature of the dehumidifying device for resin raw materials so that oil and moisture do not get mixed into the dry raw materials. need to be considered.

The operation of the above embodiment will be explained below.

First, start the compressed air source (not shown),
The drive device 21 is started to rotate the drum B, the timer 40 is set appropriately, and the blower 25 and hot air generator are also started.

When the resin molding machine C is operated in this state, when the movable part of the molding machine C retreats after molding, the switch 39 comes into contact for a moment, the timer 40 is started, the solenoid valve 14 is opened for a certain period of time, and the drive device 41 of the feeder 11 is also started. do.

For this reason, compressed air is blown into each ejector 7, 32, so the undried raw material in the storage box 6 is sucked into the ejector 7, sent together with the air into the transport pipe 9, flows into the hopper 10, and here The raw material separated from air is transferred to Screw Feeder 1.
1 to the chute 5 and flows into the drum B.

In this way, the raw material that has flowed into the drum B is repeatedly scraped up by the scraping plate 27 of the rotating drum B and then dropped.

On the other hand, the hot air from the hot air generator 26 is sent to the duct 2.
4 and is blown from the front to the rear inside the drum B, so as mentioned above, inside the drum B,
The hot air comes into contact with the raw material, which is repeatedly raised and lowered by the scraper plate 27, and evaporates the moisture in the raw material. It is released from the opening and exhausted from the exhaust port 42 of the insulation box A.

Further, the raw material from which moisture has been removed by contact with the hot air is discharged from the numerous discharge ports 29 of the drum B, enters the raw material box 31, is sucked by the ejector 32, and is supplied to the hopper 35 of the molding machine C.

After a certain period of time, the solenoid valve 14 closes and the hoppers 10, 3
The supply of raw materials to molding machine C is stopped, and during that time the supply of raw materials to molding machine C
performs a molding operation to form the desired product.

When the molding is completed, the movable part of the molding machine C returns and the switch 39 is closed, and the same replenishment of raw materials and supply to the molding machine C as before is automatically repeated. During this time, the drum is continuously rotating, so that drying is carried out without interruption within the drum.

In addition to the above-mentioned control method, the ejector 7 is controlled by a level detector in the raw material tank 31.
By making sure that there is always dry raw material required for one or more moldings in the hopper 1, and by operating only the ejector 32 in synchronization with the molding machine C, the raw materials required for one molding are supplied to the hopper 35. Good too.

〔effect〕

Note that even if the drum is installed horizontally as shown in the illustration, if the scraping plate is angled, the raw material will gradually move forward due to the flow effect, but the drum may also be installed slightly forward.

As described above, this invention provides a rotating drum inside an insulating box, supplies undried synthetic resin raw material to the rear end of the drum from a supply chute at the rear end of the insulating box, and scrapes the raw material with a scraper plate inside the drum. Since hot air is blown into the drum from the hot air inlet at the front while raising and dropping the drum, the raw material and hot air come into sufficient contact and the raw material is dried in a short time. That is, according to experiments, sufficient drying is achieved by adjusting the rotation of the drum and the angle of the scraping plate so that the temperature inside the drum is kept at 100°C to 150°C depending on the type of resin, and the raw material is allowed to stay in the drum for about 5 minutes. .

Therefore, according to the present invention, there is no need to dry the raw material in advance, and a fixed amount of dry material can be automatically supplied to the molding machine while drying the raw material in synchronization with the operation of the resin molding machine.

In addition, a plurality of perforated plates made of disc-shaped metal steel are installed at regular intervals in the drum along with the scraping plate, so the flow velocity of the hot air is moderately controlled by the resistance of these perforated plates, and the raw material inside the drum is There is no need to worry about being blown back by hot air. Therefore, the residence time of the hot air in the drum becomes longer, improving efficiency, and it is possible to prevent undried raw materials from flying ahead of the outlet due to splashing when the raw materials fall, and are discharged from the discharge hole of the drum. The dried synthetic resin raw material is temporarily stored in the raw material box from the outlet of the insulation box, and from there it is automatically supplied to the next resin molding machine via the air transport pipe, so even if the drum is in continuous operation, it can be operated intermittently. This has the effect of facilitating the supply of dry synthetic resin raw materials to the resin molding machine.

[Brief explanation of the drawing]

Fig. 1 is a partial longitudinal sectional side view of the dehumidification supply device of the present invention, Fig. 2 is an enlarged longitudinal sectional side view of the main part of the same, and Fig. 3
The figure is a longitudinal sectional front view further enlarging the same as above. A... Insulation box, B... Drum, 5... Chute, 9, 34... Air transport pipe, 27... Scraping plate, 28... Perforated plate, 29... Discharge port, 30...
Discharge tube, 31...raw material box.

Claims (1)

[Claims] 1 It has a supply chute for undried synthetic resin raw materials at the rear end, an outlet for dried synthetic resin raw materials at the lower front end, and a hot air inlet at the center of the front end. A rotating drum rotated by a suitable drive device is provided, the inner end of the chute is inserted into the central opening of the rear end plate of the drum, and a discharge hole for the raw material dried in the drum is provided at the front outer periphery of the drum. The above-mentioned hot air blowing port faces the opening in the center of the front end plate of the drum, and a plurality of scraping plates for stirring raw materials are arranged on the inner surface of the peripheral wall of the drum. A plurality of perforated plates are arranged concentrically at appropriate intervals, a raw material box for temporarily storing the dry raw materials is provided at the bottom of the insulation box, and an air transport pipe is attached to this raw material box to automatically supply the dry raw materials inside. Automatic dehumidification supply equipment for synthetic resin raw materials.