JPS5872407A - Automatic feeding device with dehumidifying function for synthetic resin material - Google Patents

Abstract

PURPOSE:To obtain the titled device that is designed to supply dry material by air blast from an exhaust port at the outer periphery of the front side of a heat insultating box by supplying material from the rear side of the heat insulating box into a drum, blowing the hot air from the front end and stirring the material by rake-up blades and then dried. CONSTITUTION:Compressed air is blown into each ejector 7, 32, undried material in a storage box 6 is sucked with the air, separated from the air at a hopper 10 and introduced into a rotary drum B. In the drum B there is rake-up blades 27 which rake upward and then falls down repeatedly. The hot air is blown from a duct 24 into the drum and exhausted from an exhaust vent 42. The material dehumidified by the hot air is exhausted from many outlets 29 into the material box 31, sucked by an ejector 32, and is supplied to a hopper 35 of molding machine C. After a given time an electromagnetic valve 14 is shut, the supply of the material to the hoppers 10, 35 is interruped and molding operation is carried out by molding machine C to obtain a given product.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dehumidification supply device for dehumidifying synthetic resin raw materials and supplying the dehumidified synthetic resin raw materials to a molding machine.

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

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, it is necessary to start drying 1 to 3 hours before the start time, which requires early arrival of personnel, and there are also problems such as high heat loss.

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

That is, in this invention, a rotating drum is provided in an insulated box, and while the drum is rotated, undried raw material supplied from the rear end of the drum is stirred by a scraping plate inside the drum, and hot air blown from the front end of the drum is used to stir the raw material. The present invention provides an automatic dehumidifying and feeding device for synthetic resin raw materials, in which the dried raw materials are discharged from a discharge hole on the outer periphery of the front end of a drum and sent to a hopper of a resin molding machine by pneumatic transportation.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the automatic dehumidifying supply device of the present invention will be explained below based on the accompanying drawings.

In the figure, (~ is an insulating box, and this insulating box (c) is the third insulating box.
As shown in the figure, it consists of a top-open main body 1 mainly made of heat insulating material, and a lid 3 mainly made of heat insulating material attached to the top with a hinge 2 so as to be openable and closable, and has a locking fitting 4 for fixing this lid 3. ing.

5 in FIG. 2 is a supply chute for undried raw materials, and this chute 5 is provided approximately in the center of the rear end of the insulation box (~).

In addition, 6 in Figure 1 is a storage box for undried synthetic resin raw materials.
An ejector 7 is provided at the top of this box, and its suction pipe 8 is connected to the box 6.
An air transport pipe 9 inserted into the hopper and connected to the outlet of the ejector 7 is connected to an inlet of a cyclone 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 14, and this solenoid valve 14
An air supply pipe 16 to the ejector 7 is connected to the 10,000 outlet via an air volume adjustment valve 15.

The drum member 17 is divided into drum members 17, and one side edge of both members 17 is openably and closably connected by a shaft 18, the other side edge is provided with a flange, and these seven flanges can be 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 both drum members 17 are combined to form a cylindrical peripheral wall, disc-shaped end plates 22 and 23 are removably fixed to the front and rear of both ends by means such as screws.
A drive device in which a flange provided on the outer periphery of 23 is rotatably supported by a pair of support rollers 20 placed on both front and rear sides of the box (c), and the pair of rollers 20 are configured with a motor, a speed reducer, etc. 21 to drive the drum Φ) to the third
Rotate in the direction of the arrow in the figure.

The front end of the chute 5 is inserted into the center opening of the rear end plate 23 of the drum Φ) as shown in Figure 2, and the hot air inlet at the tip of the hot air duct 24 is inserted into the center of the front of the insulation box (c)). fixed,
This air inlet is inserted into the central opening of the end plate 22 at the front of the drum. This duct 24 is connected to the outlet of a hot air generator 26 having a blower 25 as shown in FIG.
The airflow generated in step 5 is heated by the heater in the generator 26 and blown into the drum.

Reference numerals 27 in FIGS. 2 and 3 indicate a plurality of scraping plates provided on the inner surface of the peripheral wall of the drum. Inside each scraping plate 27 group, a plurality of perforated plates such as disc-shaped wire mesh are installed. () of the drum using appropriate mounting hardware at regular intervals.

Further, near the front end of the peripheral wall of the drum (to), a large number of discharge ports 29 are provided as shown in FIG. Its lower end is communicated with the dry raw material box 31.

An ejector 32 is also arranged at the top of this raw material box 31, and its suction pipe 33 is inserted into the box 31, and the air transport pipe 34 connected to the outlet of the ejector 32 is connected to the resin molding machine p as shown in FIG. It is connected to the inlet of the cyclone hopper 36.

Further, an air volume adjustment valve 36 is provided at the other outlet of the solenoid valve 14.
and the air pipe 3 to the ejector 32 via the air purifier 37
Connect 8.

Reference numeral 89 in FIG. 1 is a detection switch that is opened and closed by the movable part of the molding machine (q). This switch 39 is inserted into the power supply circuit of the synchronous timer 40.
When the solenoid valve 14 is closed, the solenoid valve 14 is activated for a set time.
, and rotate the drive device 41 of the screw feeder 11. Note that an exhaust port 42 is provided in the lid 3 of the heat insulation box (c). The small air purifier and air reservoir 43 is also used as an air reservoir for dehumidifying and purifying the air and accumulating air volume when transporting dry raw materials to the resin molding machine. In other words, when the nozzles of two ejectors 7.32 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 of ejector operation time. It is necessary for 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 carefully 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. There is a need to.

The device of the present invention has the above configuration, and its operation will be explained below.

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

When the resin molding machine 0 is operated in this state, the molding machine (9
When the movable part of the feeder 11 is retracted, the switch 39 is momentarily contacted and 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.

For this purpose, since compressed air is blown into each ejector 7.32, the undried raw material in the storage box 6 is blown into the ejector 7, and occasionally sent together with air into the transport pipe 9 and into the hopper 10. The raw material separated from the air is sent to the chute 5 by the screw feeder 11 and flows into the drum (b).

In this way, the raw material that has flowed into the drum (B) is repeatedly scraped upward by the scraping plate 27 of the rotating drum (B) and then falls down.

- Since the hot air from the hot air generator 26 passes through the duct 24 and is blown from the front to the rear inside the drum (C), the scraping plate 2
The hot air comes into contact with the raw material that is repeatedly rising and falling in step 7, evaporating the moisture in the raw material, and this moisture-laden air is discharged through the numerous ventilation holes of the drum member 17 or the opening at the other end. It is released and exhausted from the exhaust port 42 of the insulation box (c).

In addition, the raw materials that have been exposed to hot air and have their moisture removed are placed in drums (
(b) is discharged from the many discharge ports 29 and enters the raw material box 31, is sucked by the ejector 32, and is drawn into the hopper 3 of the molding machine 0.
5.

After a certain period of time, the solenoid valve 14 is closed and the supply of raw materials to the hoppers 10 and 35 is stopped, during which time the molding machine (9) performs a molding operation to form a desired product.

When the molding is finished, the movable part of the molding machine (9) returns and switches 3
9 is closed, and the same replenishment of raw materials and supply to molding i (Q) as before are automatically repeated.During this time, the drum is continuously rotating, so drying is carried out without interruption within the drum.

In addition to the control method described above, the ejector 7 also controls the raw material tank 31.
By controlling the level detector inside the machine so that there is always dry raw material necessary for one or more moldings in the raw material tank 31, and by operating only the ejector 32 in synchronization with the molding machine 0, one molding process is performed. The raw materials required for this may be supplied to the hopper 35.

In this invention, as described above, a rotating drum is provided in a heat insulating box, and a granular synthetic resin raw material is supplied to the rear end of the drum (B) to form a scraping plate inside the drum (B). Since hot air is blown in from the front while the raw material is stirred up and dropped by 27, the raw material and the hot air come into sufficient contact with each other, and the raw material is dried in a short period of time. In other words, according to experiments, the temperature inside the drum (b) varies by 100% depending on the type of resin.
Sufficient drying is achieved by adjusting the rotation of the drum and the angle of the scraper plate 27 so that the raw material can be retained in the drum (c) for about 5 minutes at 150'C.

Therefore, there is no need to dry the raw materials beforehand.
A fixed amount of dry raw 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, the drum is equipped with a plurality of perforated plates such as disc-shaped wire mesh at regular intervals along with the scraping plate, so the flow rate of the hot air is moderately controlled by the resistance provided by the perforated plates, and the raw material inside the drum is There is no fear of being blown back by hot air. Note that the residence time of the hot air in the drum becomes longer, improving efficiency, and it is possible to prevent undried raw materials from advancing toward the outlet due to splashing when the raw materials fall. Note that if the drum is mounted horizontally as shown in the illustration, but if the upper plate is angled, it will gradually move forward due to the flow action.
This drum may be installed slightly forward.

[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 is a longitudinal sectional front view further enlarged. (c)...insulation box (c)...drum 5...
・Supply shoe) 9.34...Air transport pipe E...
Upper plate 28-...Perforated plate zt...Discharge port
30--Discharge pipe 31--Raw material box. Patent applicant Nobuhiro Nomura

Claims (1)

[Claims] It has a supply chute for the undried synthetic resin raw material at the rear end, an outlet for the dried synthetic resin raw material at the lower front end, and a hot air inlet at the center of the front end. A rotating drum rotated by a drive device is provided,
The inner end of the chute is inserted into the central opening of the rear end plate of this drum, and a large number of discharge holes for the raw material dried in the drum are arranged at appropriate intervals on the front outer periphery of the drum. The above-mentioned hot air blowing port faces the opening in the center of the end plate, a plurality of scraping plates for stirring raw materials are arranged on the inner surface of the peripheral wall of the drum, and a plurality of disc-shaped wire meshes etc. are arranged in the center of the drum. perforated plates are arranged concentrically at appropriate intervals, and a raw material box for storing dry raw materials is provided at the bottom of the insulation box, and a pneumatic transport pipe and an unused raw material for transporting the raw materials in this raw material box to the hopper of the resin molding machine are provided. An automatic dehumidifying and supplying device for synthetic resin raw materials, each equipped with an air transport pipe that supplies dry raw materials into the drum.