JPH0416697B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] This invention provides a method for drying powder or granular materials such as synthetic resin materials (also referred to as materials to be dried) before supplying them to a synthetic resin molding machine or the like. This invention relates to a device for drying granules, etc.

[Conventional technology]

Conventionally, this type of drying apparatus for powder and granular materials has been disclosed in (a) Japanese Utility Model Publication No. 6981-1981, and (b) Japanese Unexamined Patent Application Publication No. 1983-1989.
As shown in Publication No. 71362, two or more drying chambers are rotatably provided at equidistant positions on a rotating shaft rotated by a drive source, and a hot air receptacle is formed near the bottom end of each drying chamber. A blower pipe connected to a heat source is fixed at the corresponding location of this hot air inlet, and as each drying room rotates, the hot air inlet of each drying room is sequentially communicated with the blower pipe, and the hot air is supplied to each drying room. There is a known method in which the dried material is fluidized and dried by hot air directed from below upward, and the dried material is supplied from the upper part of the drying chamber and taken out from the lower part of the drying chamber.

(c) As shown in Japanese Patent Publication No. 42-1833, a structure is adopted in which hot air of different temperatures is supplied to a plurality of divided drying chambers to dry the material to be dried to a desired drying temperature, and each It is also known that a drying chamber is provided with a batch for loading and unloading the material to be dried, thereby allowing fluidized drying.

[Problem to be solved by the invention]

However, (1) In the conventional examples (a) and (b) above, the material to be dried is supplied from the hopper at the top of the drying chamber, and the dried material is discharged from the bottom of the drying chamber by its own weight. Therefore, the material to be dried may remain in the drying chamber when it is discharged, and the drying chamber must be cleaned every time the material is changed.

In addition, in the conventional example (c), the material to be dried is supplied and taken out from batches provided in each drying chamber, so although it has the advantage of being able to supply and discharge the material to be dried from the same location, Similarly, the material to be dried remains in the drying chamber and is difficult to discharge, making cleaning difficult.

(2) In conventional examples (a) and (b), each drying chamber is supplied with hot air at a desired constant drying temperature, so two or more items to be dried with different drying temperatures can be dried. There is a problem that even a single object to be dried cannot be dried by changing the drying temperature.

This invention aims to solve all of the problems of the conventional examples (a), (b), and (c) above, and prevents the dried material from remaining in the drying chamber when the material is discharged. In addition, not only does it eliminate the need to clean the drying chamber when changing materials, but by drying at different drying temperatures, the material to be dried is heated at an appropriate temperature, improving drying efficiency and shortening drying time. The aim is to provide something that helps people achieve their goals.

[Means to solve the problem]

In order to solve the above problems, the present invention rotatably provides two or more drying cylinders at equidistant positions on a rotating shaft rotated by a drive source, and forms a hot air receptacle near the lower end of each drying cylinder. However, a blower pipe connected to a heat source is fixed at a corresponding location of the hot air inlet, and as each drying tube rotates, the hot air inlet of each drying tube is sequentially communicated with the blower tube, and the blower tube is connected to the blower tube. It is installed so that it communicates with two or more drying chambers at the same time, and
A drying device for powder and granular materials, etc., which sets a temperature difference in the hot air supplied to the blower pipes, and fluidizes and dries the material to be dried supplied to each drying chamber by the hot air directed from the bottom to the top. , a conveying pipe is provided upstream of at least one material inlet of the drying cylinder, and a material supply pipe and a dried material discharge pipe are connected to this transport pipe via a switching valve,
The materials to be dried are supplied into the drying cylinder through the material supply pipe using the air force of the air source, and the dried materials are discharged through the dried material discharge pipe using the suction force of the air source. On the other hand,
The conveying tube is inserted into the drying tube that communicates with the conveying tube so as to be able to move up and down, and a lid is provided on the outer periphery of the lower end of the conveying tube, and a filter is inserted between the drying tube and the short tube. It adopts a structure characterized by the fact that it is worn over the body.

At least one or more drying chambers may be configured so that exhaust heat after use of the heat source is returned to the air source for circulation.

[Effect]

(1) When the drying cylinder comes to the position where the material to be dried is placed, the material to be dried is supplied into the drying cylinder and filled to a predetermined amount. The material to be dried is supplied into the drying cylinder by opening the switching valve and using the energy of the air source to supply the material from the conveying pipe via the material supply pipe (2) Once the drying process has been completed, the drying chamber of the drying cylinder is , and then rotated one frame at a time to a plurality of drying positions. In this drying position, the hot air from the heat source is dried in a flowing state from the bottom to the top, so even if processed at a higher temperature than the normal heating temperature or at a lower temperature (cooling), the powder and granules will not form lumps or stick to each other. Nor.

Therefore, while performing this fluidized drying, we create temperature differences in the hot air from the blast pipes so that the drying temperatures in each of the multiple drying chambers are different, so by selecting the desired heating temperature, drying Two or more objects to be dried at different temperatures can be dried. Furthermore, after drying at the normal drying temperature of the resin material, such as 110°C in the first drying room, 150°C in the second drying room, and 100°C in the third drying room, It is also possible to adopt a step of drying at a high temperature and then returning the temperature to a normal drying temperature or a slightly lower cooling temperature. Furthermore, it is also possible to obtain a mixed material by supplying materials having different drying temperatures to drying chambers each having a desired temperature and mixing them while drying.

(3) The material to be dried that has been dried to a desired moisture content in the drying chamber in the drying cylinder is discharged from the material discharge section at the take-out position. At this time, the material to be dried stored between the lid and the filter is moved down the transport pipe and discharged from the system through the switching valve that is opened from the material inlet of the transport pipe using the suction force of the air source. do. This completely removes any remaining material in the drying chamber. On the other hand, the heated air that has undergone heat exchange in the drying room can be discharged to the outside of the system along with the moisture that has been dehumidified from the material, or it can be appropriately treated with a filter, etc., and then returned to the air source for circulation. .

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

Reference numeral 1 denotes a pedestal, and mounting plates 2 and 2a are fixed horizontally to the upper and lower parts of the pedestal 1. At the center of both the upper and lower mounting plates 2 and 2a, there is a mount plate placed on the mounting plate 2. A rotating shaft 4 driven by a drive source 3 is rotatably supported via bearings 5, 5. A drying chamber 9 is provided at the upper and lower portions between the upper and lower mounting plates 2 and 2a for storing and drying materials to be dried such as powder and granules.
The support plates 6, 6a of the drying tubes 8 ₁ to 8 ₄ formed with
It is rotatably supported on a rotating shaft 4.

Four through holes 7 are bored at equal positions on the same circumference of the support plates 6, 6a, and a pair of upper and lower through holes 7, 7 on the vertical line are filled with reinforced glass, metal, etc. Four drying tubes 8 ₁ , 8 ₂ , 8 ₃ , and 8 ₄ having the same shape are fitted in equidistant positions. Each drying cylinder 8 ₁
Short pipes 10 are installed between the upper and lower ends of ~8 ₄ and the mounting plates 2, 2a, and each short pipe 10 forms a flange 10a on the opposite side of the support plates 6, 6a, and the mounting plates 2, A ring body 11 is externally fitted on the side facing 2a, and a coil spring 12 is wound between one end of the ring body 11 and the flange 10a. Therefore, each drying cylinder 8
₁ to 8 ₄ are held, and the ring body 11 of the short pipe 10 is kept in close contact with the mounting plates 2, 2a at all times, and the end surface 11a of each ring body 11 is rotated while slidingly contacting the facing portion of the mounting plates 2, 2a. . 13 is Patsukin.

A hot air inlet 14 is formed near the lower end of the drying chamber 9 of each drying cylinder 8 ₁ to 8 ₄ , that is, in the lower end of the short tube 10 in the embodiment. At least two or more locations corresponding to these hot air outlets 14...14 (four locations in the example)
, air pipes 15...15 are attached to the mounting plate 2a, and a connecting pipe 16 is connected to the lower end of the air pipes 15. The tip of each connecting pipe 16 has valves V ₁ and V _{2 .}
The air source 18 is connected to a heat source 17 via a heat source 17, and an air source 18 fixed to the lower end of the frame 1 is connected to the other side of the heat source 17.

A hood 28 communicating with the short pipe 10 connected to the upper end of the drying tube 8 ₁ is connected to the mounting plate 2, and the hood 28 and the drying tubes 8 ₁ to 8 ₄ are connected to the upstream side of at least one material inlet 8. A pipe 19 is provided, and a material supply pipe 2 is connected to this transport pipe 19 via a switching valve 20.
1 and a dried material discharge pipe 2 for discharging the dried material.
2 are connected.

The material to be dried is supplied into the drying cylinders 8 ₁ to 8 ₄ by the air force of the air source through the material supply pipe 21, and the dried material is discharged through the dried material discharge pipe 22. and discharge by the suction force of the air source. On the other hand, the conveying tube 19 is fitted into the drying tube 8 ₁ communicating with the conveying tube 19 so as to be vertically movable by means of a cylinder device, and a lid 35 is provided on the outer periphery of the lower end of the conveying tube 19. A taper 3 is provided on the lower surface of the lid body 35 where the lower end of the transport pipe 19 is connected.
6, and a filter 13 having a dish-shaped cross section is clamped between the drying tube ₈₁ and the short tube 10. According to such a configuration, when the dried material is discharged from the dried material discharge pipe 22, the lid body 3
5 can be moved downward, so that all the material to be dried in the drying chamber 9 can be discharged without remaining, which is particularly effective when the cross-sectional area of the drying chamber 9 is large. In addition, the lid body 35
When 3 is placed near the filter 33, both 3
The material to be dried stored between 5 and 33 is covered by the lid 35.
Since the drying material moves into the gap between the taper 36 and the recess 33a of the filter 33, it is possible to prevent the material to be dried from being caught in the drying material, which has the advantage of being easy to clean.
Note that the design can be changed so that the short pipe 10 has the role of the blower pipe 15.

Although the number of blower pipes 15 is the same as the number of hot air outlets 14 as in the embodiment, two or more can be arbitrarily selected.

While rotating each hot air outlet 14, the blower pipe 1 is
Although not shown, the method for communicating with the air pipe 5 may be to move the air pipe 15 up and down using a cylinder device, and the structure thereof is not limited.

Short pipes 10 connected to the upper ends of the drying tubes 8 ₂ , 8 ₃ , 8 ₄ ,
10, 10 are connected to an exhaust pipe 23, and the exhaust pipe 23 is configured to be exhausted from one exhaust port 23a.

The exhaust from this exhaust port 23a may be immediately discharged to the outside, but in this embodiment, the third
A connecting pipe 24 is connected as shown in the figure, and the connecting pipe 24 includes a filter 25, an outside air intake adjustment section 28, and a valve.
Connect to air source 18 via V ₄ while valve
There is now one connecting pipe 27 in the rear position of V ₄ as a valve.
It is connected to the connecting pipe 16 below the drying cylinder 8 ₁ via V ₃ . The hot air passed through each of the drying tubes 8 ₂ to 8 ₄ passes through the exhaust pipe 23 , the connecting pipe 24 , and the air source 18 to the heat source 1 .
7 to increase the thermal efficiency of the heat source.

A reed switch 28 is installed on the outer periphery of the upper support plate 6.
The sensing member 28a is installed, while the switch bracket 28 is installed at a 90° interval inside the pedestal 1.
When the four drying chambers 9 (drying tubes 8) are rotated and the sensing member 28a is fitted into the switch bracket 28b, the drying chamber 9 is positioned. This positioning is performed sequentially and periodically.
That is, when each drying chamber 9 is rotated, the hot air inlet 14 of each drying chamber 9 is periodically communicated with each blast pipe 15 sequentially (every 90 degrees in this embodiment). The powder and granular material supplied to each drying chamber 9 is fluidized and dried by hot air directed from downstream to upstream.

In addition, 30 is a filter that prevents the materials to be dried stored in the drying tubes 8 ₂ , 8 ₃ , 8 ₄ from jumping out into the exhaust pipe 23, 31 is a key, and 32 is a level meter such as a phototube or a nearby switch. Detects the level amount of material. 33 is a multilayer sintered filter, and 34 is a nut.

Further, the air pipe 15 is connected to two or more drying chambers 9...
The hot air supplied to the blast pipe 15 is provided with a temperature difference. As a result, as mentioned above, two
In addition to drying more than one material, the material can be dried in a shorter time by drying at a temperature higher than the normal drying temperature of the resin material to be dried and then cooling it back to the normal drying temperature. It has the advantage of being dry.

Although four drying tubes 8, that is, four drying chambers 9 are provided in this embodiment, two or more can be arbitrarily employed.

The air source 18 may have a small capacity and only blow air from the heat source 17, and the supply and discharge of materials may be performed by a separate air source.

Note that although the drying device in this embodiment is configured to be fixed to the pedestal 1, it may also be configured to be directly mounted on the molding machine.

The operation of this embodiment will be explained below based on FIG. 3. If material is now supplied to the drying cylinder ₈₁ ,
Valve V ₁ is closed, valve V ₂ is open and drying tubes 8 ₂ , 8 ₃ ,
8 ₄ is being dried by sending hot air from heat source 17,
Since the used hot air passes through the filter 25 and valve V ₄ is closed, it temporarily stagnates and passes through the valve.
V ₃ is open.

Next, when the material is completely supplied to the drying tube 8 ₁ , hot air drying is also started in the drying chamber 9 of the drying tube 8 ₁ .
That is, at this time, the valve V ₁ is opened in conjunction with the level meter, and heated air from the heat source 17 is blown into the drying cylinder 8 ₁ by the air source 18 to dry the powder and granular material in the drying chamber 9 . On the other hand, the valve V ₂ is also open, and the powder and granules in the drying cylinders 8 ₂ , 8 ₃ , 8 ₄ are also dried, and the hot air used in the drying cylinders 8 ₂ , 8 ₃ , 8 ₄ is transferred to the valve V _{4 .} is open and valve _V3 is closed, the air is passed through the air source 18 to the heat source 17 and reused.

When the powder and granules are completely dried to a predetermined moisture content in the drying cylinder 8 ₁ , the valve V ₁ is opened, the valve V ₂ is closed,
Since the valve V ₃ is closed and the valve V ₄ is open, only the powder inside the drying tube 8 ₁ in the figure is sent to the air source 18 via the connecting pipe 16 and the blower pipe 15 connected to the valve V ₁ . The heated air generated by the heat source 17 is discharged out of the system through the conveying pipe 19 and the dried material discharge pipe 22. This discharged dried powder is transferred to a molding machine (not shown).
etc. will be sent to. When the drying tubes 8 ₂ , 8 ₃ , and 8 ₄ also come to the same position as the drying tube 8 ₁ , the same effect as described above is performed.

In addition, in the embodiment, when the heated air from the heat source 17 is sent into each drying chamber 9 by the air source 18 and the hot air discharged after drying is recirculated, the circulation line is equipped with a cooler and a dehumidifying unit. Various other design changes can be made, such as attaching a preheating source for a preheater connected to an air source described elsewhere, and supplying preliminary heat from the preheating source to at least one or more drying chambers 9.

〔Effect of the invention〕

According to this invention, (1) at least one of the drying tubes
A transport pipe is provided upstream of the two material inlets, and a material supply pipe 21 and a dried material discharge pipe are connected to this transport pipe via a switching valve 20, and the material to be dried is supplied into the drying cylinder. This is done by the air force of the air source through the material supply pipe, and the dried material is discharged by the suction force of the air source through the dried material discharge pipe, so the switching valve is switched. With this, the material to be dried can be automatically and continuously supplied into each drying cylinder by the energy of the air source, and the dried material can also be automatically and continuously discharged from the drying cylinders.

(2) Moreover, the conveying tube is inserted into the drying tube that communicates with the conveying tube so that it can move up and down, and a lid is provided on the outer periphery of the lower end of the conveying tube, and a lid is provided between the drying tube and the short tube. Since the drying chamber is equipped with a filter, when discharging the dried material, the lid of the conveying pipe can be moved up and down as appropriate depending on the volume of the material, so that no material remains in the drying chamber and is completely removed. This has the remarkable effect of eliminating the need to clean the inside of the drying chamber when changing materials.

(3) Furthermore, while the plurality of drying chambers are rotated one by one and the material to be dried is dried in a so-called fluidized manner from the bottom of the drying chamber to the top at the drying position, the air pipes are connected to two or more drying chambers. Compared to the conventional examples (a) and (b), the present invention has a temperature difference in the hot air supplied to the blower pipe, so that the drying material is not heated during the drying process. It goes without saying that the powder particles do not form clusters or stick together, and by selecting the desired heating temperature, two or more objects to be dried with different drying temperatures can be dried. I can do it. Furthermore, after drying at the normal drying temperature of the resin material, such as 110°C in the first drying room, 150°C in the second drying room, and 100°C in the third drying room, It is also possible to adopt a step of drying at a high temperature and then returning the temperature to a normal drying temperature or a slightly lower cooling temperature. Furthermore, it is also possible to obtain a mixed material by supplying powder or granules having different drying temperatures to drying chambers each having a desired temperature and mixing them while drying.

[Brief explanation of drawings]

Each figure shows an embodiment of the present invention. 1st
2 is a plan view, FIG. 3 is a flow sheet diagram, and FIG. 4 is an enlarged longitudinal sectional view of a part of the drying tube and short tube. 3... Drive source, 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ ... Drying cylinder, 9
...Drying room, 14...Hot air inlet, 15...Air pipe, 17
... heat source, 18 ... air source, 19 ... conveyance pipe, 20 ... switching valve, 21 ... material supply pipe, 22 ... dried material discharge pipe, 23 ... exhaust pipe.

Claims (1)

[Scope of Claims] 1. Two or more drying tubes _{8 1} , _{8 2 .} A hot air socket 14 is formed near the lower end of the cylinder, and a blow pipe 15 connected to a heat source 17 is fixed at a corresponding position of the hot air socket 14. As each drying cylinder 8 ₁ , 8 ₂ . Tube 8
The hot air inlets 14 of ₁ , 8 ₂ . . .
The blast pipes 15 are provided so as to communicate simultaneously with two or more drying tubes 8 ₁ , 8 ₂ . A drying device for powder and granular materials, etc., configured to fluidize and dry the material to be dried supplied to the drying cylinders 8 ₁ , 8 ₂ . . . by means of hot air directed upward from below. A conveying pipe 19 is provided on the upstream side of the drying cylinder 8 , and a material supply pipe 21 and a dried material discharge pipe 22 are connected to this transport pipe 19 via a switching valve ₂₀ .
8 ₂ The material to be dried is supplied into the material supply pipe 2.
1, and the dried material is discharged through the dried material discharge pipe 22.
The drying cylinder 8 1 communicates with the conveying pipe 19, and the conveying pipe 19 is inserted into the drying cylinder 8 ₁ so as to be vertically movable.
A lid 35 is provided on the outer periphery of the lower end of the conveying pipe 19, and a filter 33 is provided between the drying cylinder 8 ₁ and the short pipe 10.
A drying device for powder and granular materials, etc., characterized in that it is made by clamping .