JPH10109025A - Sealing mechanism in kneader - Google Patents

Abstract

(57) [Summary] [Problem] As a seal member for a spindle of a kneading blade of a kneading machine, a material obtained by impregnating asbestos with a phenol resin is usually used. However, this asbestos has a poor sealing property and a high hardness, which may damage the shaft, and its use as a carcinogen is prohibited. It is an object of the present invention to provide a sealing mechanism which improves sealing performance and has excellent wear resistance. Kind Code: A1 A kneading tank is provided with a pair of kneading blades in a kneading tank, the support shafts of which pass through both side plates of the kneading tank and are rotatably supported by left and right bearing members. The kneading machine 1 is characterized in that seal members 30, 31 made of phenol resin and cut fibers are provided inwardly of the left and right bearings 14 and hold the support shaft in an airtight manner. Also,
In the second invention, the seal members 30 and 31 are mainly composed of non-thermofusible carbonizable fibers such as aramid fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a sealing mechanism in a kneader.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show how to mount a seal mechanism in a conventional kneader. This kneading machine 50 forms a kneading tank 51 by a tank main body 52 having a U-shaped cross section, side plates 53 and 54 attached to both sides thereof, and an upper holding lid 55, and forms a pair of kneading in the tank. Blade 5
6 and 57, and the support shafts 58 and 59 of the blades pass through the side plates 53 and 54, and bearings 62 provided on bearing housings 60 and 61 provided outside thereof.
It is rotatably supported by 63. At this time, seal members 64 and 65 are provided inside the bearings 62 and 63 (on the kneading tank side) to prevent leakage.

[0003]

The above-mentioned sealing member 64,
As 65, a material obtained by impregnating asbestos with a phenol resin is usually used. This is because when the pressure applied to the kneaded material during kneading is large (about 2 kg / square cm) and the mixed powder is a fine powder, it may enter the bearings 62 and 63,
This is to prevent this. However, this asbestos has poor sealing properties, and is insufficient for preventing leakage of kneading materials and especially liquid additives, and has a high hardness, becomes an abrasive without carbonization during sliding friction, and may damage the spindle. At the same time, the use of asbestos as a carcinogenic harmful substance is prohibited. In view of the above, an object of the present invention is to provide a sealing mechanism that improves sealing performance and has excellent wear resistance.

[0004]

According to a first aspect of the present invention, a kneading tank is provided with a pair of kneading blades, and a spindle of the kneading blade penetrates both side plates of the kneading tank. A kneading machine rotatably supported by the left and right bearing members, wherein the kneading machine is provided with a sealing member made of phenolic resin and cut fibers disposed inward of the left and right bearing members and holding the support shaft airtight. And

[0005] The seal mechanism of the present invention having the above structure can prevent the kneading substance from entering the bearing through the shaft from the kneading tank.

According to a second aspect of the present invention, the seal member is mainly composed of non-thermally melted carbonizable fibers (hereinafter referred to as high-performance fibers) such as aramid fibers.

[0007] The seal member of the present invention having the above structure is carbonized without melting by heat generation,
It is suitable as a heat-resistant bearing material having a low friction coefficient.

A third aspect of the present invention is characterized in that the sealing member is obtained by mixing cut fibers of high-performance fibers and a phenol resin, and molding this into a required shape.

[0009] The seal member of the present invention having the above-described structure can be easily formed into a required shape, and can be formed into a complicated shape.

In a fourth aspect of the present invention, the seal member is formed by forming a high-performance fiber in a nonwoven fabric or a woven fabric, and impregnating the nonwoven fabric or the woven fabric with a phenol resin.

The seal member of the present invention having the above-described structure can be easily formed by being wound around a bearing.

A fifth aspect of the present invention is characterized in that a pressure air supply pipe for supplying pressure air to the seal member is provided. The present invention having the above configuration can prevent leakage due to the clean air seal.

[0013]

1 to 3 show an embodiment of the present invention. The kneading machine 1 includes a tank body 3 having a U-shaped cross section,
A kneading tank 2 is formed by side plates 4 and 5 attached to both sides thereof and an upper holding lid 6, and a pair of kneading blades 7 and 8 are housed in the tank, and a spindle 1 of the blade is provided.
Reference numerals 0 and 11 penetrate the side plates 4 and 5, and are rotatably supported by bearings 14 and 15 provided on bearing housings 12 and 13 provided outside the side plates. 20, 2
Reference numeral 1 denotes a seal mechanism for preventing leakage, which is provided inside the bearings 14 and 15 (on the kneading tank side). In the example shown in FIG.
An example is shown in which the corner is curved to prevent the kneading substance from adhering to the corner. Other structures are seal mechanisms 20, 21
Except for this, the structure is the same as the conventional structure, and the description is omitted.

The seal mechanisms 20 and 21 have the same structure, and only one seal member 20 will be described. Regarding the other sealing mechanism 21, the same components are denoted by the same reference numerals and description thereof is omitted.

The seal mechanism 20 includes a pair of inner and outer seal members 30 and 31 disposed at intervals, a pressurized air supply pipe 32 provided for a shaft portion therebetween, an outer seal member 31, and a bearing. And a pressure air discharge pipe 33 provided opposite to the shaft portion between 16 (or 17). In addition,
The joint between the bearing housings 12 and 13 and the support shaft forms a slight gap a so as to allow the pressurized air to flow through the inner and outer seal members 30 and 31 and the discharge pipe 33. Try to lead.

The seal member 31 is made of a material such as aramid fiber which is non-thermally melted and is directly carbonized by heating (hereinafter referred to as a highly functional material). This aramid fiber has excellent rebound resilience to compression, retains long-term sealing properties, has chemical resistance, and is not melted.
A heat-resistant fiber that starts to decompose and carbonize only at 0 degrees, and is generally used under trade names such as Conex (Teijin Co., Ltd.), PBO fiber (Toyobo), and Kevlar.
These are lubricated and have good heat conduction barrier properties by being carbonized, and do not cause seizure due to heat generation.

When these fibers are used, a cut fiber obtained by cutting a fiber (for example, 2 denier) of the above-mentioned high-functional material into a short piece (for example, about 6 mm) and a phenol resin are mixed, and a mold is used. Use it after shaping it into the required shape. Alternatively, a nonwoven fabric or a woven fabric is formed from the above materials, impregnated with a phenol resin, wound around a cylindrical member having a predetermined size, and cut into a predetermined size.

In the above configuration, the compressed air is supplied to the supply pipe 32.
By supplying the mixture to the shaft portion, the kneaded substance from the kneading tank is prevented from flowing out to the bearings 14 and 15 along the shaft and of course to the internal seal member 30 by the pressurized air.
There is a case where some of the pressurized air leaks into the tank along the shaft, but this is not a problem since it is discharged from the gap with the upper lid as it is.

At this time, since the seal members 30 and 31 use the above-mentioned high-functional material, they are not melted and carbonized as they are even if the temperature rises due to friction. It has lubricity and abrasion resistance, does not require lubrication, and has heat resistance and durability.

[0020]

As described above, according to the present invention, since there is provided a seal member which is disposed inwardly of the left and right bearing members for supporting the spindle of the kneading blade and keeps the spindle airtight, the kneading is performed. It is possible to prevent the kneading material and the liquid additive in the tank from flowing along the shaft and prevent the mixture from being mixed, thereby increasing the durability of the bearing. At this time, since the sealing member is mainly composed of a non-thermally fused and high-functionality carbonizable fiber such as an aramid fiber, it has an excellent elastic recovery force, so that it maintains a long-term sealing property and generates heat. Because it carbonizes without melting even at that time, the carbide has self-lubricating properties, and there is no need for lubrication,
In addition, the shaft is not damaged. In addition, when using the above-mentioned high-performance fiber, when a cut fiber of the fiber and a phenol resin are mixed as a bonding agent and molded into a required shape, the molding is easy and a complicated shape can be produced. It is. Another method for manufacturing a sealing member using high-performance fibers is to form a nonwoven fabric or a woven fabric with the high-performance fibers, impregnate it with a phenol resin, and wind around a roll having a predetermined diameter as a shaft. Sometimes the recipe is simple. Further, since high-pressure air is supplied to the seal member from the pressurized air supply pipe, there is an effect that leakage can be prevented by the clean air seal.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a kneader to which the present invention is applied.

FIG. 2 is a longitudinal sectional view taken along line XX in FIG.

FIG. 3 is a cross-sectional view taken along the line YY shown in FIG.

FIG. 4 is a longitudinal sectional view of a conventional kneader.

FIG. 5 is a transverse sectional view taken along the line ZZ in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Kneader 2 Kneading tank 4 Side plate 5 Side plate 7 Kneading blade 8 Kneading blade 14 Bearing 15 Bearing 20 Seal mechanism 21 Seal mechanism 30 Seal member 31 Seal member 32 Pressure air supply pipe

Claims (5)

[Claims] 1. A kneading machine having a pair of kneading blades in a kneading tank, wherein a spindle of the kneading blade penetrates both side plates of the kneading tank and is rotatably supported by left and right bearing members. A sealing member comprising a phenolic resin and a cut fiber, which is located inwardly of the bearing member and keeps the spindle airtight, comprising a sealing member. 2. The sealing mechanism according to claim 1, wherein the sealing member is mainly composed of non-thermally melted carbonizable fibers (hereinafter referred to as high-performance fibers) such as aramid fibers. 3. A sealing mechanism in a kneading machine according to claim 1, wherein the sealing member is formed by mixing cut fibers of high-performance fibers and phenol resin and molding the mixture into a required shape. 4. A sealing mechanism in a kneading machine according to claim 1, wherein the sealing member is formed by forming a high-performance fiber into a nonwoven fabric or a woven fabric and impregnating the nonwoven fabric or the woven fabric with a phenol resin. 5. A seal mechanism in a kneading machine according to claim 1, further comprising a compressed air supply pipe for pressurizing pressurized air toward the support shaft between the bearing member and the seal member.