JPS6346416Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an intermediate bearing sealing device for a screw shaft suitable for use in a vertical screw conveyor that vertically transports various powders such as kaolin, cement, phosphate rock, etc. This is a device that prevents wear and tear on the bearing device by blocking out particles and particles.

The intermediate bearing device used in conventional vertical screw conveyors has a structure in which the bearing part is formed in the outer cylinder part, so as the diameter of the bearing becomes larger, the sealing part becomes longer, and the structure is complicated and the overall This has the disadvantage of increasing weight and cost.

In addition, with vertical screw conveyors, which use the centrifugal force generated by the rotation of the screw to press powder and granules against the outer cylinder while transferring them upward, it is necessary to ensure the sealing of the bearing, since the powder and granules try to forcefully enter the bearing. There is a need. However, since the bearing portion is formed in the outer cylinder portion, the seal of the bearing portion must be a seal capable of withstanding high pressure, which has the disadvantage that the entire device becomes expensive.

The present invention was devised to solve the above-mentioned drawbacks.By forming the bearing part inside the outer cylinder, areas where the pressure of pushing the wheeled conveyed object is high can be avoided, and the entire bearing device can be made compact. It is an object of the present invention to provide an intermediate bearing sealing device for a vertical screw conveyor that can ensure sealing of the bearing portion.

Below, the example will be explained with reference to the drawings.
In the figure, 1 is an outer cylinder of a vertical screw conveyor, 2 is a screw shaft, and 3 is a screw blade fixed to the screw shaft 2. Reference numeral 4 denotes a bearing device that rotatably supports the intermediate portion of the screw shaft 2, and the bearing device 4 includes:
A bearing sleeve 6 that supports the screw shaft 2 via a rolling bearing 5, a plurality of arm rods 7 that connect the bearing sleeve 6 to the outer sleeve 1, and the rolling bearing 5 are brought into contact with each other from both sides and held in a predetermined position. It is composed of a sleeve 8 for holding the rolling bearing 5 and a plurality of sealing members 9 arranged between the sleeves on both sides of the rolling bearing 5 and the bearing sleeve 6. Note that the rolling bearing 5 is provided on the inner circumferential surface of the bearing sleeve 6 at an intermediate portion in the vertical direction of the bearing sleeve 6.

Reference numeral 11 denotes a disk body formed to have approximately the same outer diameter as the bearing tube 6 and detachably attached to the screw shaft 2. The disk body 11 is adjacent to and facing both upper and lower end surfaces of the bearing tube 6 with a small gap therebetween. It is located. Reference numeral 10 denotes a labyrinth portion, and the labyrinth portion 10 includes a groove 13 formed on the inner periphery of both upper and lower end surfaces of the bearing cylinder 6, and a cylinder 14 provided in the disc body 11 and fitted into the groove 13.
It is formed by.

Since the present invention is constructed in this manner, when the screw blade 3 rotates to lift the powdery material, the powdery material is removed from the radial gap between the upper and lower end surfaces of the bearing tube 6 and the side surface of the disc body 11. Even if they try to infiltrate, there is a small gap between the end face of the bearing tube 6 and the side surface 11 of the disk body, and the intrusion direction of the powdery material is perpendicular to the direction in which the powdery material is transported, so it is difficult to penetrate. .

Even if powder or granules enter through this small gap, since the disc body 11 is rotating at high speed, the centrifugal force due to the rotation and the rotation of the disc body 11 will generate an airflow in the small gap, and the airflow Since the particles are repelled and released in the circumferential direction, the intrusion of particles can be strongly prevented.

Even if particulate matter enters the small gap, its path will be blocked by the cylinder 14 provided on the disk body 11, and the inner circumference of the end surface of the bearing tube 6 and the disk body 11 will block the path.
Due to the labyrinth effect caused by the unevenness formed by the inner periphery of the end surface, it is possible to effectively prevent particulate matter from entering the bearing. Furthermore, by arranging a plurality of sealing materials 9, the life of the rolling bearing can be maintained even longer.

In addition, in a vertical screw conveyor, when transferring powder and granular materials upward, there is a risk that the end surface of the bushing of the intermediate bearing will get in the way and prevent the material from being transferred upward. The end face is covered with a disc body 11, and the centrifugal force generated by the rotation of the disc body 11 can repel powdery materials toward the inner circumference of the outer cylinder 1, reducing the efficiency of upward transfer of powdery materials. Never.

Moreover, since the disk body 11 is formed to have approximately the same outer diameter as the bearing tube 6, the efficiency of lifting the powder and granular material is not reduced.

Further, by providing the bearing device inside the outer cylinder 1, the entire bearing device can be made smaller, the sealing area is small, the structure is simple, the weight can be reduced, and the manufacturing cost can be significantly reduced. Further, since the disc body 11 is detachably attached to the screw shaft, it is very effective when performing maintenance, inspection, etc.

In the above embodiment, the disc rotating at the end face of the bearing cylinder had a flat shape.
As shown in FIG. 3, if the disk body is provided with a protrusion 12 directed toward the end surface of the bearing cylinder, the action of holding back particulate matter can be more reliably performed.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of the main part of a vertical screw conveyor equipped with a bearing sealing device according to the present invention;
The figure is an enlarged front sectional view of the bearing device, and FIG. 3 is a diagram showing another embodiment. 2... Screw shaft, 5... Rolling bearing, 6
... bearing tube, 9 ... sealing material, 11 ... disk body.

Claims (1)

[Scope of utility model registration request] A bearing cylinder is fixed in the outer cylinder through a plurality of arm rods, and a rolling bearing that supports the middle part of the screw shaft is arranged on the inner peripheral surface of the bearing cylinder at the vertically intermediate part. A plurality of sealing materials are arranged on both the upper and lower sides of the bearing cylinder, grooves are formed on the inner periphery of the upper and lower end surfaces of the bearing cylinder, and a cylinder that fits into the grooves is provided on the disc body. A labyrinth portion is formed with the concave groove, and the disc body is formed to have approximately the same outer diameter as the bearing tube, and can be freely attached to and detached from the screw shaft while facing each other with a small gap between the upper and lower end surfaces of the bearing tube. An intermediate bearing sealing device for a vertical screw conveyor, characterized in that it is installed in a vertical screw conveyor.