JPH0688250B2 - Shaft sealing device for easy removal of invading powder from kneading machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a kneading machine for manufacturing raw materials such as synthetic resins and rubbers, and removes raw materials that have entered the shaft sealing device and are clogged to change the manufactured product. The present invention relates to a device that extremely facilitates the work to be performed.

BACKGROUND OF THE INVENTION Synthetic resins, rubbers and other raw materials for production include synthetic resins, rubber solids, powders, carbon, iron oxide powders, and high-viscosity melts. Select and supply to the kneader.

The kneading machine mixes and kneads the raw materials by screw blades of two rotor shafts rotating in opposite directions meshing with each other.
In the refueling type shaft sealing device as shown in FIG. 2, a part of it is attached to the periphery of the rotor shaft 3 at both ends of the screw blade and the end plate 2 fitted in the side frame 1 of the casing, and part of it is attached. It solidifies, further penetrates into the shaft sealing device through the gap between the rotor shaft flange 4 and the end plate 2, and is fixed to the rotor shaft surface.

Further, in the oil-free type shaft seal device as shown in FIG. 3, even when the seal ring 5 is directly crimped to the rotor shaft flange 4, the seal ring 5 penetrates between the inner surface of the seal ring 5 and the outer surface of the rotor shaft. That is, this phenomenon occurs regardless of whether the shaft seal device is oil-supplied or not, and the intrusion cannot be prevented by any structure of the shaft seal device.

Even if a part of the raw materials adheres to the surface of the screw blade end, the wall surface, or the gap between the parts as described above, there is no problem in kneading the same raw material, but it is necessary to use a kneader to switch to another product. If another raw material is to be supplied, the above-mentioned deposit may be mixed in another raw material although it is a small amount, so it is necessary to carefully remove all the deposit.

Although what is attached to the screw blade end and the casing wall surface can be easily removed, conventionally, the removal work of the raw material that has penetrated into the shaft sealing device had to disassemble the shaft sealing device. However, the disassembling and assembling work is not easy, and it took three people including the work for removing the raw materials and took 8 hours or more. Therefore, when it is desired to switch the product two to three times a day, it is not possible to comply, and the switch to the new product has to be postponed.

[Problems to be Solved by the Invention] As described above, it is a great problem in terms of production efficiency that the kneading machine must be stopped for 8 hours or more each time a product is switched.

The problem is that it takes time to remove the raw material that has penetrated into the shaft sealing device, because the removal work of the residual material inside the casing and the adhering raw material can be performed easily.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure in which a shaft sealing device is disassembled to a degree that allows cleaning in a short time and is easily assembled.

[Means for Solving the Problems] In the present invention, instead of the conventional spring of the shaft sealing device, the seal ring 5 is moved along the rotor shaft by hydraulic pressure and pressed or pulled back to the wear ring 8. To seal or open.

The structure is a guide rod that slides parallel to the rotor shaft 3.
The moving arm 14 supported by 16 is moved by the hydraulic machine 11, and the adjuster 17 at the tip of the moving arm 14 presses the seal ring 5 and the seal return ring 7 fixed thereto through the slip ring 18 against the wear ring 8. Alternatively, the hook-shaped portion 20 of the adjuster 17 is hooked on the hooking flange 19 of the seal return ring 7, and the seal ring 5 is pulled back.

[Operation] In order to clean the shaft sealing device, the springs that have been precisely adjusted in the past are all loosened and removed, and the seal ring 5 is also removed, and the raw material before the rotor shaft is clogged is removed and reassembled. Precisely adjust the spring pressing force,
Kneading work was started by supplying new raw materials.

In the present invention, the pressing force due to the hydraulic pressure is released only by lowering the hydraulic pressure, and only by moving the piston of the hydraulic machine in the opposite direction, the seal ring 5 is retracted to open the shaft sealing device and idle the rotor shaft. By doing so, it is possible to naturally remove the invading powder and easily complete the removal work. When the removal work is completed, the part that has been retracted by the hydraulic machine is moved forward, and if the seal ring is pressed at a specified constant pressure, the kneading of the new raw material can be started immediately. The required time is extremely short and does not affect the production line.

Embodiments The present invention will be described with reference to the drawings of one embodiment.

FIG. 1 is a front view of a shaft sealing device portion of a cross section taken along one rotor shaft of a kneading machine with an oil supply type shaft sealing device.

A rotor shaft 3 is provided with a screw blade for kneading. A wear ring 8 is fitted into the side plate 1 and directly contacts the rotor shaft flange surface 4 to prevent oil leakage and raw material powder invasion. Therefore, an antifriction alloy is plated on the contact portion of the wear ring 8 with the rotor shaft flange surface. The seal ring 5 is pressed against the bearing 10 side of the wear ring 8 together with the seal return ring 7 while rotating with the rotor shaft 3. An O-ring 6 is fitted between the seal Thing 5 and the rotor shaft,
A groove 9 for oil supply is provided on the contact surface of the wear ring 8 in contact with the seal ring 5.
Are provided to form a shaft seal device.

The seal return ring 7 has a hooking flange 19 and is fixed to the seal ring 5 by a knock and a set screw.

On the other hand, a hydraulic machine 11 is installed on the frame of the bearing 10 of the rotor shaft 3, and its piston shaft 12 is connected to a moving arm 14 via a connecting link 13. The moving arm 14 is supported by a guide rod 16 that slides in a guide cylinder 15, and is moved in parallel with the rotor shaft 3 by a piston shaft 12. Therefore, the adjuster 17 at the lower end of the moving arm presses the seal return ring 7 and the seal ring 5 against the wear ring 8 via the slip ring 18 to prevent leakage of lubricating oil and invasion of raw material powder during kneading work.

When the product is switched, the hook-shaped portion 20 of the adjuster 17 moves the hooking flange 19 of the seal return ring 7 together with the hooking seal ring 5 toward the bearing 10 to open the shaft sealing device. When the open rotor shaft idles for a while, the old raw material powder that has entered between the rotor shaft and the wear ring 8 is naturally discharged.

When the discharge of the invading powder from the shaft sealing device is completed, the seal ring 5 can be hydraulically pressed against the wear ring 8 to immediately start the kneading operation of the new raw material. The time lost during that time is only 15 minutes per person.

[Effects of the Invention] Prior to supplying a new raw material to the kneading machine to switch the product, it is necessary to remove what has entered the shaft sealing device of the powder of the old raw material. Hanging 8
Although it took more time, the hydraulic shaft sealing device of the present invention made it possible for an extremely short time for one person to complete in about 15 minutes.

Furthermore, not only the powder removal work but also the replacement of the wear ring and other parts of the shaft sealing device can be completed in a similar short time, and the profit is extremely large because the down time of the production line is reduced. .

[Brief description of drawings]

FIG. 1 is a front sectional view of a hydraulic shaft sealing device for a kneading machine according to the present invention, and FIG. 2 is a front sectional view of a conventional oil-free shaft sealing device,
FIG. 3 is a front sectional view of a conventional oil supply type shaft sealing device. 1 ... Side frame, 2 ... End plate 3 ... Rotor shaft, 4 ... Rotor shaft flange surface 5 ... Seal ring, 6 ... O-ring 7 ... Seal return ring, 8 ... Wear ring 9 ... Oil groove, 10 …… Bearing, 11 …… Hydraulic machine 12 …… Piston shaft, 13 …… Connection link 14 …… Movement arm, 15 …… Guide cylinder 16 …… Guide rod, 17 …… Adjuster 18 …… Slip ring , 19 …… Hooking flange 20 …… Hook-shaped part

Claims (2)

[Claims] 1. A shaft sealing device for a kneading machine for raw materials such as plastics and rubbers, which seals or opens the shaft sealing device by moving the seal ring 5 along the rotor shaft by hydraulic pressure and pressing or pulling it back against the wear ring 8. A shaft sealing device that easily removes invading powder from a kneading machine 2. The structure of sealing and opening of the shaft sealing device is such that a moving arm 14 supported by a guide rod sliding parallel to the rotor shaft 3 is moved by a hydraulic machine 11, and at the time of work, an adjuster 17 at the tip of the moving arm 14 is used. The seal ring 5 and the seal return ring 7 fixed to the seal ring 5 are pressed against the wear ring by the above, and the hook-shaped portion 20 of the adjuster 17 is hooked on the seal return ring 7 at the time of cleaning, and the seal ring 5 is pulled back. Shaft sealing device for easy removal of invading powder from kneading machine