JPS5839862Y2 - Hopper dryer attached to synthetic resin molding machine - Google Patents

Description

[Detailed Description of the Invention] This invention mainly relates to a hopper dryer attached to a synthetic resin injection molding machine that dries the material supplied to the synthetic resin injection molding machine within the hopper.

Conventionally, this type of hopper dryer connects the discharge port of one hopper dryer to the material supply port of one molding machine, and blows heated air from a heater with a blower connected to the bottom of the hopper to cool the inside of the hopper. The material was allowed to dry as it descended.

Therefore, it is necessary to keep a relatively large amount of material in the hopper at all times to match the drying time in the hopper, which has the drawback of large losses when increasing or decreasing material consumption or changing materials. Ta.

In the present invention, two hoppers for supplying materials are installed in parallel for one molding machine, and one drying heater is connected to these two hoppers to send heated air through a switching valve. 2
The exhaust air discharged from the first hopper is introduced into one drying blower, and the exhaust air from the blower is passed through the first switching valve.
Two dehumidifying towers are installed in parallel to alternately introduce and dehumidify, and the dry air alternately discharged from the two dehumidifying towers is introduced into the drying heater through a second switching valve to dehumidify the material. In addition to supplying the supply to the supply hopper, a regeneration heater connected to a regeneration blower is connected to the first switching valve, and a dehumidification pipe is connected to the second switching valve, thereby dehumidifying one of the dehumidification towers. Some of the hopper dryers are configured to perform regeneration operation in which the air is dehumidified by the heated air from the regeneration heater in the other dehumidification tower, thereby eliminating the drawbacks of the conventional hopper dryer and enabling economical operation. This is what was provided.

Embodiments of the present invention will be described below with reference to the drawings.

X is a synthetic resin injection molding machine, X' is its material supply port, A
, B connect the common discharge port 1 provided at the bottom to the material supply port X' of the molding machine, and receive material supply from the cyclone type collectors A' and B' provided at the top of each machine. Two hoppers installed in parallel, 2 is the 8 of these two hoppers, B
3 is a screw conveyor that transfers the material discharged from the damper 2 toward the discharge port 1.

Hl is a drying heater installed between two hoppers A and B, v8. (2) b are switching valves respectively attached to the forked pipes 4 connected to the lower part of the heater H1.

The air heated in the drying heater H1 is sent to the lower part of the hoppers A and B through the switching valves V- and Vb, and is deposited inside the hoppers while rising therein. Heat and dry the material.

5a and 5b are exhaust pipes connected to the upper parts of hoppers A and B, respectively; 6 is a line filter that separates the powder and granules in the exhaust gas discharged by these two exhaust pipes 58 and 5b; 7 is the upper part of this filter 6. This is a drying blower that pressurizes air discharged through a pipe 8 connected to and circulates it toward the drying heater H1.

■1 is the first four-way switching valve connected to the outlet of the blower 7, C8 and Cb are respectively connected to this switching valve ■l, and two valves are installed in parallel behind the hoppers A and B. The dehumidification tower, ■2, is a pipe 9 connected to the upper part of these two dehumidification towers C, C2. , 92, and is a four-way switching type second switching valve that operates simultaneously at the same angle as the first switching valve (1).

The drying air pressurized by the drying blower 7 is passed through the first and second switching valves (1). ■Due to the switching operation in step 2, one of the dehumidifying towers C
2 or C2 to be dehumidified and then sent to the drying heater H1 through the pipe 10.

H2 connects the regeneration blower 11 to the first switching valve V
This is a regenerative heater connected to 1.

The outside air sucked in from the regeneration blower 11 is heated by the regeneration heater H2, and sent via the first switching valve V1 into the dehumidification tower C2 or C1 which is not used for dehumidifying drying air. After absorbing the moisture in the dehumidifier filled in the dehumidifying tower, it is released to the outside through the dehumidifying pipe 20 connected to the second switching valve v2, and absorbs and humidifies the dehumidifying agent in the tower. to play.

In the figure, 12 is a supply damper that opens and closes between the collectors A', B' and hoppers A, B, respectively, and 14 is a supply damper 12 that detects the material level in hoppers A, B.
13 is a blowout prevention level meter; 15 is a temperature meter that detects the temperature in hoppers A and B; 1
6 is a temperature measuring device for detecting the drying temperature of the drying heater H1, 17
18 is a temperature measuring device for detecting the drying temperature of the regeneration heater H2, and 18 is a rotary plate fitted to the bottom of the hoppers A and B for removing accumulated dust.

Further, the discharge damper 2 and the screw conveyor 3 at the lower part of the two hoppers A and B can be opened and rotated at the same time, or only one of them can be selectively operated.

Since this hopper dryer having the above configuration uses two material supply hoppers, the amount of material stored is relatively small, and the drying efficiency can be increased and the amount of residual material can be reduced.

By connecting one drying heater that sends heated air through a switching valve into these two hoppers, the cost of the apparatus can be reduced and economical operation can be achieved.

Since the air supplied to this drying heater is dehumidified by two dehumidifying towers that are equipped with first and second switching valves before and after and are used alternately, the moisture absorbent in the tower can be regenerated. This occurs during dehumidification operation using the other, and continuous operation is possible.

The first and second switching valves are attached to these two dehumidification towers,
By connecting a regeneration heater equipped with a regeneration blower to the first switching valve and connecting a dehumidification pipe to the second switching valve, the cost of the dehumidification and regeneration equipment can be reduced, and dehumidification and regeneration operations interfere with each other. can be done simultaneously and continuously without being affected.

Furthermore, since the drying air that circulates through the hopper, drying blower, dehumidification tower, and drying heater is circulated within a closed circuit, there are advantages such as less heat loss and economical operation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a flowchart schematically showing its configuration, FIG. 2 is a partially cutaway front view of the embodiment, FIG. 3 is a plan view, and FIG. It is a partial notch right side view. X... Molding machine, X'... Material supply port,
A, B...hopper, 1...discharge port,
2...Discharge damper, 3...Screw conveyor, A', B'...Collector, 12...
...Supply tambour, 13...Blowout prevention level meter, 14...Level meter, 15...
Temperature meter, Hl...Drying heater, 16...
・Temperature meter, 4...Two-pronged tube, V8. V b...
...Switching valve, 58, 5b...Exhaust pipe, 6.
... Line filter, 7 ... Drying blower, 8 ... Pipe, Vl ... First switching valve, V2 ... Second switching valves, C1, C2...
...dehumidification tower, 90,92...pipe, H2...
...Regeneration heater, 10...Tube, 11...
...Regeneration blower, 17...Temperature meter, 18...
... Rotating plate for removing accumulated dust.

Claims (1)

[Claims for Utility Model Registration] ■ Two material supply hoppers A connected to the material supply port X' of the base molding machine X as a common discharge port 1, and each equipped with a discharge damper 2; B are installed in parallel, and a switching valve V8.B is installed in these two hoppers A and B. One drying heater H1 is connected to send heated air through V, and the exhaust air discharged from the two hoppers A and B is introduced into one drying blower 7, and the exhaust air from the same blower 7 is Two dehumidifying towers C1 alternately introduce water through the first switching valve ■1.
, C2 are installed in parallel, and the dry air alternately discharged from the two dehumidifying towers C1 and C2 is introduced into the drying heater H1 via the second switching valve ■2. A regeneration heater H2 connected to the regeneration blower 11 is connected to the first switching valve 1 which alternately supplies air to the dehumidification towers C1 and C2. The second supplying dry air from C2 to the drying heater H1.
Connect the dehumidifying pipe 20 to the switching valve ■2 of the dehumidifying tower C.
During the dehumidifying operation of step 1, the inside of the other dehumidifying tower C2 is regenerated and dehumidified by the heated air from the regenerating heater H2, and a hopper attached to the synthetic resin molding machine having the above configuration is configured. Hairdryer