JPS5846384Y2 - Hopper dryer attached to synthetic resin molding machine - Google Patents

Description

[Detailed description of the invention] This invention connects a hot air blower with a blower and a heater to the lower side of the hopper, supplies hot air to the material stored in the hopper from below, and dries the material at the same time. A discharge port formed on the lower end surface of the hopper is connected to a material supply port of the molding machine, and the material is directly supplied to the molding machine from the discharge port in a predetermined dry state. Regarding hopper dryer.

Conventionally, in this type of hopper dryer, the hopper is formed in one chamber, and the heated air supplied from the hot air blower is once diffused along the inner wall of the lower part of the hopper, which is formed in a wax shape, as shown in the drawing. It was constructed so that a person entered the hopper through a ventilation wall made of a perforated plate formed in the shape of a double funnel at the bottom, heated and dried the material from the bottom, and discharged it from the exhaust pipe at the top.

As mentioned above, the conventional hopper dryer, which supplies hot air only from the lower side to the material stored in the chamber, directly reaches the outlet of the initially charged material and ends up in the molding machine without being sufficiently dried. It is necessary to allow sufficient drying time before operating the molding machine, which requires a long handholding time, and has the disadvantage that the contained material cannot be heated rapidly in the early stage of drying. .

Therefore, in order to eliminate the above-mentioned conventional drawbacks, the present invention has developed an upper and lower drying chamber in which the inside of the hopper is divided into an upper and lower drying chamber A that is equipped with a material input section and an exhaust pipe, and a lower drying chamber A that is equipped with an outlet at the lower end surface. The upper drying chamber B is equipped with an agitator that stirs the materials put into the chamber, and a damper that opens and closes the gap between the lower drying chamber A and a perforated plate around the outer periphery of the damper. By forming a lower peripheral wall that ventilates with the upper part of the lower drying chamber, a lower peripheral wall that ventilates with the upper part of the lower drying chamber is fitted, and a ventilation chamber with ventilation holes arranged on the inner peripheral surface is provided at an appropriate interval on the outer periphery of the peripheral wall. A funnel-shaped ventilation wall made of a perforated plate is fitted inside the lower part of the hopper connected to a hot air blast tube connected to a blower and a heater, while a branched ventilation wall is installed in the main ventilation path that runs through the inside of the heater. A heater is provided to further heat the drying air passing through this branched ventilation passage to a high temperature, and a high-heating blower tube connected to the branched ventilation passage is connected to the ventilation chamber of the upper drying chamber. , provided a hopper dryer that can rapidly heat materials by eliminating the need for initially charged materials to reach the outlet directly or requiring long drying times before operating the molding machine. It is something.

An embodiment of the present invention will be described below with reference to the drawings. A is a lower drying chamber in which a discharge port A' opening at the lower end surface is connected to the material supply port of the molding machine, B is a lower drying chamber in which a porous hole is installed in the upper part of this lower drying chamber A. By fitting the lower peripheral wall B' formed in the shape of a funnel with a plate and bringing the annular peripheral edge B'' into close contact with the upper edge of the lower drying chamber A, the upper drying chamber is separated from the lower drying chamber A with ventilation. As for the chamber, 1 is a damper that fits into the center of the funnel-shaped lower peripheral wall B' from above and opens and closes between the upper and lower drying chambers B and A.

5 is a material input part provided partially on the upper surface of the drying chamber B; 6 is a hollow rotary shaft 6' which rotates at the center of the upper drying chamber B by being chain-driven by a motor M installed on the same upper surface; A stirrer 7 consists of a stirring rod 6'' fixed on the outer periphery, and 7 is an air cylinder 7 whose upper end is fitted with a lifting rod 7'' which passes through the rotating shaft 6' and has the damper 1 fixed to its lower end. 8 is also an exhaust pipe provided on the upper surface of the upper drying chamber B, and 12 is a plurality of damper opening and closing devices arranged at appropriate intervals on the outer circumference of the lower peripheral wall B' of the upper drying chamber B, and on the inner peripheral surface. A ventilation chamber 2 is formed between the upper inner wall of the lower drying chamber A by disposing ventilation holes 12', and is connected to the lower side surface of the lower drying chamber B by connecting the blower 3 and the heater 4. Hot air blower, A
// is a ventilation wall formed by fitting a funnel-shaped perforated plate with an appropriate gap in the hopper to which the blower tube 2 is connected.

As shown in FIG. 2, the interior of the heater 4 includes a main ventilation passage 9 that includes a main heater 4a and communicates with the hot air blower 2, and a sub-heater 4b that is controlled to a higher temperature than the main heater 4a. A branch ventilation passage 10 is provided from the ventilation passage 9, and the drying air heated to a higher temperature in the branch ventilation passage 10 passes through a high-heating blower tube 11 connected to the passage 10, and then passes through the upper drying chamber B. It is configured such that the air is supplied to the ventilation chamber 12 at the lower outer periphery of the air.

This hopper dryer configured as described above temporarily stores the material input from the input section 5 in the upper drying chamber B closed by the damper 1, operates the blower 3 and heater 4, and connects the material to the hot air blower 2. The material is heated to a high temperature in the two-part drying chamber B by supplying heated air from the high-heating blower tubes 11 and at the same time operating the stirrer 6.
The process of opening the opening, transferring the material to the lower drying chamber A, and introducing the next material into the upper drying chamber B is repeated several times, until a predetermined amount of material has accumulated in the lower drying chamber A, and then the discharge port A' is opened. While the dried material flows out from the drying chamber B, undried material is intermittently supplied to the upper drying chamber B in accordance with the flow amount.

The synthetic resin used in the hopper dryer of this invention is A.
During BS, AS, and AMS, the temperature inside the hot air blower tube 2 is approximately 90℃.
In addition, the inside of the high-heating blower tube 2 is maintained at approximately 120°C.

As described above, the blower 3 is installed on the lower side of the hopper, which has the material input part 5 and the exhaust pipe 8 on the upper part, and the material outlet A' connected to the material supply port of the molding machine on the lower end surface. In a hopper dryer attached to a synthetic resin molding machine, which is connected to a hot air blower 2 connected to a heater 4, the inside of the hopper is equipped with a damper 1, a ventilated lower peripheral wall B', and an agitator 6. It is vertically divided into a chamber B and a lower drying chamber A' which is equipped with a hot air blower tube 2 on the lower side and a discharge port A on the lower end surface, and a branched ventilation passage 10 is formed in the heater 4 to provide high heating. An auxiliary heater 4b is attached thereto, and the high heating blow tube 11 connected to the branch ventilation passage 10 is connected to the blow chamber 12 having the blow holes 12' on the outer periphery of the lower circumferential wall B' having air permeability. According to the present invention, a relatively small amount of material stored in the upper drying chamber B can be rapidly heated to a high temperature and then sequentially dried in the drying chamber A at a relatively low temperature. Therefore, the material initially introduced does not directly reach the discharge port at the bottom of the hopper, and compared to conventional machines that accommodate the full capacity of material at one time and dry it with hot air only from the bottom, the molding machine Waiting time for drying before operation can be reduced.

In addition, the undried materials that are continuously replenished are heated in the upper drying chamber in the early stage of feeding by high-heated air that is heated by a sub-heater and supplied through a high-heating blower cylinder and a blower chamber, and is stirred by an agitator. Therefore, the temperature rises quickly and the drying time until the product is discharged through the lower drying chamber can be shortened.

Therefore, the total capacity of the dryer is small, making it possible to make it more compact, and it has better thermal efficiency than conventional devices.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway elevational view thereof, and FIG. 2 is an elevational view schematically showing the internal structure of the heater. A...Lower drying chamber, A'...Discharge port,
A''...Ventilation wall, B...Upper drying room,
B'... Lower peripheral wall, B//... Peripheral part, 1... Damper, 2... Hot air blower tube, 3... Blower 14...Heater, 4
a...Main heater, 4b...Sub-heater,
5... Material input section, 6... Stirrer, 6
'... Rotating shaft, 6''... Stirring frame, M.
...Motor, 7...Damper opening/closing device,
7'... Air cylinder, 7''... Lifting rod, 8... Exhaust pipe, 9... Main ventilation path,
10... Branch ventilation duct, 11... High heating blower tube, 12... Blower chamber, 12'...
Air vent.

Claims (1)

[Scope of utility model registration request] A blower 3 and a heater 4 are connected to the lower side of the hopper, which has a material input part 5 and an exhaust pipe 8 on the upper side, and a material outlet A' on the lower end surface that is connected to the material supply port of the molding machine. In a hopper dryer attached to a synthetic resin molding machine connected to a hot air blower 2, the inside of the hopper is an upper drying chamber B equipped with a material input section 5 and an exhaust tube 8, and an outlet A' on the lower end surface. The upper drying chamber B is divided into an upper and lower chamber with a lower drying chamber A equipped with the upper drying chamber A, and the upper drying chamber B is equipped with an agitator 6 that stirs the material introduced into the same chamber, and a damper 1 that opens and closes between the lower drying chamber A and the lower drying chamber A. A lower peripheral wall B' that ventilates with the upper part of the lower drying chamber A is fitted on the outer periphery of the damper 1 by forming a funnel-shaped porous plate, and a lower peripheral wall B' that ventilates with the upper part of the lower drying chamber A is fitted inside the damper 1 at an appropriate interval on the outer periphery of the peripheral wall B'. A ventilation chamber 12 is provided with ventilation (L12') arranged on the circumference, and in the lower drying chamber A, a ventilation wall A'' formed in the shape of a funnel with a perforated plate is provided in the lower part of the hopper to which the hot air blast cylinder 2 is connected. On the other hand, a branch ventilation passage 10 is provided in the main ventilation passage 9 passing through the inside of the heater 4, and a heater 4b that heats the drying air passing through the inside of this branch ventilation passage 10 to a higher temperature is attached thereto. High heating blower tube 1 connected to 10
1 is connected to the ventilation chamber 12 of the upper drying chamber B.