JPS602899Y2 - mixing device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a mixing device.

Conventionally, blade blenders were used as mixing devices for synthetic resin raw materials.
Ribbon blender 1, Hensel mixer, etc. are known.

However, when mixing materials containing powder raw materials such as compounds, with a blade or ribbon blender, the powder raw materials are scattered near the inner surface of the mixing container, making it difficult to perform sufficient mixing. There is a possibility that the powder to be mixed becomes clogged with the blades or the rotating shaft support for stirring of the ribbon blender, making it difficult to perform the stirring operation sufficiently.

In particular, when the compound is a thermoplastic resin compound, due to frictional heat generation at the rotating shaft support, the compound clogging the support and the mixed material in the container near the support become soft or gel, resulting in so-called imosulme. There is a risk that the particles may become stuck or deposited near the support portion.

As a result, the materials to be mixed may become difficult to mix sufficiently, or
Not only is there a risk that a part of the mixed materials may be separated when the mixed materials are discharged from the mixing container or delivered, but also fish eyes, air bubbles, etc. may occur on the molding pieces when the mixed materials are formed.
Thermal decomposition produces colored particles, making it difficult to obtain good molded products.

In a Hensel mixer, it is more difficult to avoid heat generation during mixing than in a blade or ribbon blender, and the problems associated with the heat generation described above are even greater.

The present invention was developed in view of the above-mentioned points, and its purpose is to avoid clogging in the parts that are subjected to relative movement and temperature rise of the mixture, and to prevent powders or materials that are likely to undergo thermal changes. It is an object of the present invention to provide a mixing device capable of stably and sufficiently mixing a mixture for a long period of time.

Next, a preferred specific example of the present invention will be explained based on the drawings.

In the figure, 1 is a cylindrical mixing container having a supply port 2 and a discharge port 3.

The central axis of the container 1 is inclined (for example, 15 degrees) with respect to the horizontal axis, and the supply port 2 is provided above the side surface of the container 1, and the delivery port 3 is provided below the side surface of the container 1.

It is preferable that the outlet port 3 is provided near the lowermost side surface of the container 1.

A tubular shaft 6 having a stirring means 5 is fitted onto a rotating shaft 4 provided along the central axis of the container 1 .

On the shaft 6, plate-shaped arm members 7, 8 extend in a radial direction, and further plate-shaped arm members 9, 10 extend in a different radial direction from the arm members 7, 8.

Longitudinal plate-like arm members 11, 12 are fixed to the extending ends of the arm members 7, 8 and 9, 10, respectively.

Arm parts? , 8. 11 and the arm members 9, 10.12 form a stirring means 5.

Each of the arm members 7, 8 to 9, 10 may consist of one arm member.

When the rotating shaft 4 is rotated in the A direction by a motor (not shown), the mixture in the container 1 is moved in the A direction by the arm members 7 and 8.
The arm members 7° 8.9, 1 receive forces to be displaced in the A and C directions by the arm members 9, 10 in the A and C directions.
0 are provided at an angle.

The outer edges of the arm members 11 and 12 are provided so as to substantially follow the vicinity of the end and side surfaces of the container 1.
Both longitudinally inner end portions of the container 1 extend to the vicinity of the center 13 in the longitudinal direction of the peripheral wall surface of the container 1, thereby preventing the to-be-mixed material from accumulating near the center 13.

These arm members 11 and 12 apply force to the mixture in the container 1 not only in the A direction but also in the E direction so that it is collected near the axis 6, in other words near the center of the container 1.

The objects to be mixed can be sufficiently mixed by the movement in the directions A, B, C, D, and E, and since the stirring means 5 is formed of a plate-shaped arm member, heat generation during mixing can be suppressed. This avoids gelling of the raw material for thermoplastic resin as a mixture.

Therefore, the conventional Hensel mixer, which performs mixing at high speed and achieves mixing by friction between four particles of thermoplastic resin,
Stirring at a relatively low rotational speed compared to a vane blender or ribbon blender, which performs mixing by the difference in speed between the outer periphery and the center of the stirring blade, which has a small gap with the wall surface and rotates at a relatively high rotational speed. The mixing efficiency can also be increased if the means 5 are rotated.

As a result, even plasticized thermoplastic resins that tend to gel due to heat generation when a conventional Hensel mixer, vane blender, or ribbon blender is used can be uniformly mixed without generating gel particles.

Both ends of the container 1 are provided with lids 14 and 15.
Support frames 16 and 17 are fixedly attached to 4.15, respectively.

18 is a sealing member. i14.15 (7) A through hole 19.20 is provided on each center side, and the shaft 4 is connected to the hole 19.
．． 20 and protrudes outside the container 1.

The diameter of the shaft 6 gradually decreases in the vicinity of the holes 19, 20, and an annular gap 21, 22 is provided between the inner surface of the holes 19, 201 and the outer periphery of the shaft 4.

The protrusions 23 and 24 of the shaft 4 are respectively provided with bearings 25. ．． 26, bearings 27 and 28, bearing support members 29 and 30 fixed to the support frames 16 and 17, and another bearing support member 31 and 32 fixed to the members 29 and 30, rotatably supported.

33 and 34 are seal rings. Support frame 16 and lid 14
A seal ring 36 is provided near the gap 21 in the chamber 35 formed by the above, and a cover 38 connected to the gas introduction pipe 37 is provided to cover the ring 36.

The cover 38 is tightly fixed to 1114 on the one hand, and there is another seal ring 39 between the cover 38 and the shaft 4.
40 are provided.

Annular notches 36a, 39at 40a are formed in the inner peripheral edges of the seal rings 36, 39, 40.

48a? 4sb and 48c are retaining rings.

The chamber 41 formed by the cover 38 and the shaft 4 is connected to the tube 37
Together, they form a gas guide path.

The shaft 4 has annular elastic rings or retaining rings 48a, 48b, 48
The outer periphery is uniformly pressed by the elastic force of c and the rubber elastic force of the seal rings 36, 39, 40, and there is Substantially some gaps are formed.

When pressurized gas, for example compressed air, is introduced from the pipe 37 into the chamber 41 serving as a gas passage around the rotating shaft 4, the compressed air passes through the notch 36 of the seal ring 36 disposed in the chamber 41.
a1 It is introduced in the F direction through the gap between the inner circumferential surface of the inner annular lip of the ring 36 serving as the check valve means and the circumferential surface of the shaft 4, and through the gap 21.

Therefore, even if the materials to be mixed in the container 1 accumulate near the gap 21, the materials to be mixed are easily sent back into the container 1.

On the other hand, the inner annular lip portion of the force-bulb-shaped seal ring 39,40 is pressed against the shaft 4 by the pressure of compressed air introduced into the chamber
The gaps between the inner circumferential surface of the seal rings 39 and 40 and the outer circumferential surface of the shaft 4 are closed, and the rings 39 and
Compressed air leakage between 40 and shaft 4 is prevented.

As a result, it becomes easy to maintain a substantially constant pressure inside the pressurized air chamber 41, and compressed air can be uniformly introduced into the container 1 through the annular gap.

In addition, since the support part of the shaft 4 is sealed and separated from the container 1, the temperature rise near the gap 21 can be suppressed.
Since the air flow is introduced from the gas guide path, the gap 21
The vicinity can be cooled by this airflow.

Therefore, even if the mixture is made of a thermoplastic synthetic resin or its raw material, gelation or granulation in the vicinity of the gap 21 can be suppressed.

Note that the seal ring 36 is configured similarly to the seal rings 39 and 40, so that it can act to prevent gas from flowing into the chamber 41 from the container 1 at the inner annular lip.

Also in the chamber 42 formed by the support frame 17 and the lid 15,
Similar to the chamber 35, a seal ring 43, a gas introduction pipe 44, a cover 45, and seal rings 46 and 47 are provided.
The chamber 50 formed by the cover 45 and the shaft 4 is connected to the tube 44
Together, they form a gas guide path to guide compressed air from the gap 22 into the container 1 in the G direction.

49a, 49b, and 49c are retaining rings.

In addition, compressed air is introduced through pipes 37 and 44.

First, a mesh filter is provided at a desired opening of the container 1, and suction is drawn from the opening to create a negative pressure inside the container 1, and the pipe 3
Air from the atmosphere may be introduced from 7.44.

Furthermore, when the chambers 35 and 42 within the support frames 16 and 17 are used as gas guide paths, the pipes 37a and 44a do not necessarily need to be provided.

A lower opening 51 of the container 1 that communicates with the outlet 3 has a container 1
A plate-shaped member 5 and bow 4 as an opening/closing means are provided so as to be slidably supported by guide members 52 and 53 fixed to the guide members 52 and 53, respectively.

Gas guiding grooves 56 are provided on two sliding side surfaces 55a and 55b of the plate member 54 along the sliding direction H9J of the member 54.

The guide members 52,53 each extend from the container 1 and have surfaces 57a, 58 in sliding engagement with the sides 55a, 55b.
It consists of an extending portion 57, 58 having a diameter of 1.a, and a guide piece 61, 62 that is tightly fixed to the extending portions 57, 58 and has a guide groove 59, 60 on the adhering surface.

The guide pieces 61 and 62 are provided on the side surfaces 55a and 55b of the member 54, respectively.
a side surface 63,64 in sliding engagement with a lower surface 65 of member 54;
a projecting surface 66.6 supporting member 54 in sliding engagement with
7.

The guide grooves 59 and 60 have an extended portion 51t58 and a guide piece 61, respectively.
．． 62 and functions as a gas guide hole.

Each of the guide holes 59, 60 is, for example, one gas inlet 59a.
, 60a, and four gas outlet ports 59b, 59c, 59d.
, 59e, 60by 60ct 60dt 60
e, and a communication hole 5 between the gas inlet port' and the gas outlet port.
It consists of 9f and 60f.

The gas outlet ports 59b to 59e and 60b to 60e are provided at positions facing the guide grooves 56 of the plate member 54, respectively, and when the opening 51 is closed by the plate member 54,
The gas introduced from the inlet ports 59a and 60a is sent to the outlet port 59.
b~59e.

The guide grooves 56 are sprayed from 60b to 60e.

Note that the outlet ports 59b to 59e and 60b to 60e are connected to the surface 6, respectively.
The opening is near 6.67.

During the mixing operation of the materials to be mixed in the container 1, a portion of the gas blown into the groove 56 is transferred to the sliding side surface 55a of the member 54,
Slight gaps 68a, 68b between 55b and members 52, 53
It is fed into the container 1 in the direction from the beginning.

As a result, there is little possibility that the gaps 68a and 68b will be clogged with powder to be mixed.

When the mixture is sent out from the outlet 3 of the container 1 after the mixing operation is completed, the supply of gas from the inlets 59a and 60a is stopped, and the plate member 54 is moved from the closed position L1 via the connecting member 69. It is slid in the H direction and set to the open position L2.

Even during the operation of delivering the mixture, the stirring means 5 is rotated so that the mixture is uniformly delivered.

When the delivery of the mixture from the container 1 is completed, the gas inlet 5
The supply of gas from 9a and 60a is started, and the introduced gas is sent out from gas delivery ports 59b to 59e and 60b to 60e, and the mixture is delivered to the surface 57at 58at 6.
39 Blow off the mixture adhering to 64.66.67.

When the plate member 54 is moved in the J direction to close the gas outlet 3, for example to position L3, the gas outlet 59d closes.
, 59e, 60d, and 60e are blown into the guide groove 56, and guide the remaining deposits on the surface of the member 52, 53 facing the groove 56 in the H direction along the groove 56, and send it out. , outlet 59d = 59e, 60d, 6
A part of the gas sent out from 0e flows through the gaps 68a and 68b.
Through the plane 57at 58at 63t 64t 6L
Blow off the remaining deposits on 67 in the direction of A to J.

On the other hand, the gas delivered from the delivery ports 59b, 59c, 60b, and 60c continues to blow off the deposits on the surfaces 57a, 58a, 63, 64, 66, and 67.

Sliding surfaces 57at 58at 63t as above
Removal of deposits from 64t 66t67 is performed on plate member 5.
4 during the J direction displacement, the sliding surface 5
7at 58at 63t 64t 66t 67
This makes it possible to avoid adhesion of the to-be-mixed material and to make the opening and closing of the plate-like member 54 easy and reliable.

In addition, the gases sent out from the outlets 59b to 59e and 60b to 60e also have a cooling effect to suppress heat generation in the sliding parts.

Even if the material to be mixed is extracted from thermoplastic resin or the molding raw material, it is not only possible to avoid softening or gelling of the material to be mixed into a so-called Japanese porridge-like state, but even if a part of the material to be mixed becomes a Japanese porridge-like material, However, it is possible to avoid adhesion to sliding parts.

Incidentally, the surfaces 66, 67 may be formed to be inclined inward to facilitate the falling of deposits, or the members 61, 62 may be flat plates, and the grooves 59, 60 may be formed in the extension portions 57, 58. It may also be formed on the back surface.

In addition, the members 61 and 62 may be formed integrally with the extensions 57 and 5B.

In the mixing device 70 formed as described above, even when mixing a thermoplastic resin molding compound or pellets and a workpiece produced during thermoplastic resin molding (or a workpiece obtained by dividing the workpiece as desired), Two mixing devices 70 are connected to form a mixing device.

and configure it.

That is, by putting the work piece and a desired plasticizer etc. in the first mixing device and mixing them, the plasticizer can be uniformly adhered to the surface of the work piece without producing a sweet potato-like mixed product, Supplying the work piece to which the plasticizer is attached to a second mixing device from the outlet of the first mixing device and supplying the compound to the second mixing device to produce a mixed product in the form of sweet potato sardine. It is possible to obtain a uniform mixture of the compound and the work piece without clogging the relative moving parts of the apparatus.

Compared to a simple mixture of compound and work piece, this mixture not only has less risk of separation into the compound and work piece during shipping, but also can be uniformly softened during hot molding.

Therefore, it is possible to prevent the occurrence of fish eyes or color unevenness during mixing of colored compounds, and it is possible to obtain a desired uniform product.

The mixing device of the present invention can be applied not only to mixing raw materials for thermoplastic resins, but also to mixing materials containing other powders, and mixing materials where temperature rise should be avoided.

As described above, according to the present invention, gas can be introduced through the gap provided in the relative movement part of the mixing device, so there is not only no risk of leakage of the mixture but also no clogging of the relative movement part. Powder materials can be mixed, the temperature rise of the mixture can be avoided to suppress heat generation in the relative motion part due to the cooling effect of the introduced gas, and materials that are likely to cause thermal changes can be reliably mixed; The mixing device can be operated stably for a long period of time.

[Brief explanation of drawings]

FIG. 1 is an explanatory sectional view of a mixing device according to a preferred embodiment of the present invention, and FIGS. 2a and 2b are explanatory views of opening/closing means of the mixing device of FIG. 1. 1... Container, 2... Supply port, 3... Delivery port, 46
...Axis, 21.22...Gap, 35.41.42.
50...chamber, 37.44...tube, 52.53...
Guide member, 54...Plate member, 56...Groove, 59.
60... hole.

Claims (4)

[Scope of utility model registration request] (1) A container having an inlet hole and an outlet hole, an opening/closing means for opening and closing the outlet hole, the container penetrating the opposing walls of the container and protruding outside the container, and the protruding portion being rotatably supported. a rotating shaft that is connected to the rotating shaft, a stirring means that is attached to the rotating shaft within the container, and a gap that communicates with the gap so that gas is forcibly introduced into the container through the gap between the wall and the rotating shaft. A mixing device having a gas guide path. (2) The gas guide path includes a passage formed around the rotating shaft and check valve means disposed in the passage to allow gas to flow into the container through the passage. A mixing device according to claim 1 of the utility model registration claim. (3) The mixing device according to claim 2, wherein the check valve means comprises a seal ring having an annular lip portion that can be brought into close contact with the circumferential surface of the rotating shaft. (4) The opening/closing means includes a plate-shaped member and a guide member that slidably guides the plate-shaped member, and a gas guide groove is provided on the sliding side surface of the plate-shaped member, and the gas guide groove is opposite to the groove. The mixing device according to any one of claims 1 to 3, wherein the guide member is provided with a gas introduction hole opened at a portion where the gas is introduced.