JPH0636861B2 - Bearing device for mixing agitator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bearing device in a mixing stirrer, and more specifically, to a bearing part and a joint part when mixing and stirring powders, slurries, pastes and the like. The present invention relates to a bearing device that effectively eliminates wear.

(Prior Art) Conventionally, for the purpose of mixing and agitating powders and the like, a mixing and agitating machine equipped with an agitating shaft that revolves and rotates is widely used. Typical examples of mixing stirrers of this type (eg British Patent No. 1,0
No. 41,619), as shown in FIGS. 1 and 2, a drive shaft 3 is provided at the center of a top plate portion 2 of a hollow inverted conical container 1, and a rotary arm is provided at the lower end of the drive shaft 3. 4, a short vertical shaft 6 is provided at the lower end of the container 1 via a bearing 5, and a stirring blade 9 is provided between the tip portion 7 of the rotary arm 4 and the universal joint 8 of the upper shaft of the vertical shaft 6. The shaft 10 is rotatably provided. The stirring shaft 10 can rotate by an appropriate power transmission mechanism (not shown) provided inside the drive shaft 3 and the rotary arm 4, and can also revolve by the rotation of the rotary arm 4.

The powder or the like supplied through the charging port 11 provided in the top plate portion 2 is mixed and stirred inside the container 1 by the revolution and rotation of the stirring shaft 10, and the powder or the like after the mixing and stirring is discharged through the discharge port 12. It is discharged to the outside of the device through.

(Problems to be Solved by the Invention) In order to enable the revolution and rotation of the stirring shaft 10, the lower end of the stirring shaft 10 and the vertical shaft 6 are connected to the universal joint 8.
Connection is indispensable, and since the universal joint 8 is directly exposed in the material to be processed such as powder that is about to be mixed and stirred, the universal joint 8
This causes a problem that the sliding part of the item is significantly worn. For example, in the case of mixing an inorganic material having abrasive properties such as silica or silicate, due to abrasion of the universal joint 8 during a relatively short period of operation such as only 1.5 months,
It was acknowledged that replacement would be necessary.

It was also found that the inorganic particles having a fine particle size easily penetrate into the bearing portion 5 and cause significant wear of the bearing portion 5.

Therefore, the technical problem of the present invention is to prevent the exposure of any sliding portion into the material to be stirred and to effectively eliminate the penetration of particles into the sliding portion. To provide.

Another technical problem of the present invention is to provide a bearing device having a new composite bearing mechanism, which is completely isolated from the material to be processed, in place of the conventional universal joint, in a mixing agitator having a revolving and rotating agitating shaft. To provide.

Still another technical problem of the present invention is to provide a bearing device in which the wear of joints and bearings is suppressed and the life of the mixing device is extended in a mixing stirrer equipped with a stirring shaft that revolves and rotates.

(Means for Solving the Problems) In the mixing stirrer provided with a stirring shaft that revolves and rotates, the present inventors have at one end of the stirring shaft a rotation bearing mechanism separated from the material to be processed and a rotation bearing mechanism. By arranging the bearing mechanism, it is possible to smoothly revolve and rotate the stirring shaft, and to prevent any sliding parts from being exposed in the material to be treated such as powder, so that the rotating parts are not worn. It was found that it can be effectively prevented.

According to the present invention, in a mixing stirrer equipped with a stirring shaft that is revolved and revolved, one end of the stirring shaft is provided with a revolution bearing mechanism and a rotation bearing mechanism, and the revolution bearing mechanism is
A fluid lubricant sealing portion is provided between one end of the curved or bent revolution shaft and the bearing casing, and one end of the stirring shaft is provided with an outer cylinder portion and a central shaft portion provided through an annular gap. The other end of the revolving shaft has a hollow shaft portion that can be fitted into the annular space, and the rotation bearing mechanism and the outer cylinder of the stirring shaft are provided between the central shaft portion of the stirring shaft and the inner surface of the hollow shaft portion of the revolving shaft. A bearing device is provided in which a fluid lubricant enclosing portion is provided between the portion and the outer surface of the intermediate shaft portion of the revolution shaft.

(Operation) When a material to be treated containing inorganic particles is mixed and stirred, in a portion where two surfaces are in contact with or close to each other and these surfaces relatively move, for example, in a sliding portion, these surfaces are The wear of the surface is most remarkably promoted by the inorganic particles intervening between the surfaces. Thus, it is clear that when a universal joint is used, the four sliding parts that are rotatably provided with each other are significantly worn, and even if a ball joint is used, the sliding parts are also worn. Would be obvious.

In the present invention, such a universal joint is not used, and a revolution shaft bent or bent at an angle matching the revolution movement of the stirring shaft is provided separately from the stirring shaft. By providing a revolution bearing mechanism at one end of this revolution shaft and by providing a rotation bearing mechanism between the other end of the revolution shaft and one end of the stirring shaft, the rotation of the stirring shaft is exclusively supported by the rotation bearing, while the rotation of the stirring shaft is The revolution becomes the revolution of the revolution shaft, and these revolutions are exclusively supported by the revolution bearing mechanism. Therefore, in the present invention, it is possible to smoothly perform the revolution and rotation of the stirring shaft while preventing the sliding portion from being exposed to the material to be treated due to the use of the universal joint.

Moreover, in the present invention, by providing the revolving bearing mechanism between the revolving end portion and the bearing casing through the fluid lubricant enclosing portion, the fine particles that try to enter the bearing mechanism are introduced into the enclosing portion. It is sealed and as a result wear of the bearing mechanism is prevented.

Furthermore, one end of the stirring shaft has a double structure of an outer cylinder part and a central shaft part, the other end of the corresponding revolution shaft is a hollow shaft part, and the hollow shaft part and the end of the stirring shaft of the double structure are By forming a rotation bearing mechanism between the outer surface of the central shaft portion and the inner surface of the hollow shaft portion, without impairing the stirring action of the stirring shaft,
It is possible to cause the smooth rotation bearing action and the action of separating the bearing from the material to be treated. Further, by providing the fluid lubricant enclosing portion between the cylindrical portion and the outer surface of the hollow shaft described above, intrusion of fine particles into the rotation bearing is completely prevented.

(Example) The present invention will be described in detail based on an example shown in FIG.

The mixing stirrer to which the bearing device of the present invention is applied is the same as that shown in FIG. 1, and the bearing device shown in FIG. 3 is used instead of the universal joint 8 shown in FIG. Is a feature.

First, one end of the agitation shaft 10 that is revolved and revolves, that is, the lower end in this example, has a total of 13
A revolving bearing mechanism 13 indicated by and a rotation bearing mechanism 14 indicated by 14 as a whole are provided. In the illustrated example, the revolution bearing mechanism 13 is provided at the lowermost portion of the container 1, the rotation bearing mechanism 14 is located above it, and the curved or bent revolution shaft 15 is located between them. ing. Revolution axis 15
The bending angle of is, of course, equal to the angle formed by the stirring shaft 10 in the vertical direction.

The revolution bearing mechanism 13 comprises a revolution bearing casing 16, a stuffing box 17, and a flanged vertical 18 inserted into the center of these components. Bearing casing 1
A bearing 19 is provided between the vertical shaft 6 and the vertical shaft 18, and its upper part is closed by a seal 20 and its lower part is closed by a metal case lid 21. A gland packing 22 is provided between the stuffing box 17 and the vertical shaft 18, and a packing presser 23 is provided at the lower end of the gland packing 22. The orbiting bearing casing 16 and the stuffing box 17 are integrated by fastening their flanges with bolts and nuts (not shown), and the fluid circulating agent is provided in the space below the stapping box 17. There is a sealed portion 24, and the lubricant can be injected from the injection port 25.

The revolution shaft 15 has a flange 26 at one end, that is, a lower end.
And has a flanged vertical shaft 18 of the revolution bearing device 13. Further, it has a flange 27 at its upper end portion, and is connected to the rotation bearing mechanism 14 by the mechanism described below.

The rotation bearing mechanism 14 includes a rotation center shaft 28 with a flange, a revolving hollow shaft 29, and an outer cylinder 30. The flanged rotation center shaft 28 and the outer cylinder 30 are fastened to the lower end flange 31 of the stirring shaft 10 so that they can rotate as the stirring shaft 10 rotates and revolves. The revolving hollow shaft 29 is fitted into an annular space between the central shaft 28 and the outer cylinder 30, and a bearing 32 is provided between the central shaft 28 and the hollow shaft 29. The hollow shaft 29 is the upper end flange 2 of the revolution shaft 15.
It has been concluded in 7 and can be revolved. A stirring blade 9 is provided on the outer peripheral surface of the outer cylinder 30, and a seal 34 is provided between the inner surface of the outer cylinder 30 and the outer peripheral surface of the hollow shaft 29 via a seal retainer 33.

Further, the seal retainer 3 is also provided between the central shaft 28 and the hollow shaft 29.
A seal 36 is provided via 5. The fluid lubricant enclosing portion 37 is also provided in the annular space between the outer cylindrical portion 30 and the hollow shaft 29 which are defined by the seals 34 and 36.
A lubricant injection port 38 is provided in the outer cylinder portion 30 in order to seal the fluid lubricant in the space 37. Furthermore, in order to enable the injection of the lubricant during operation, the revolution bearing mechanism 13
The metal case lid 21 is provided with a lubricant inlet 39, and the revolution vertical shaft 18 has a passage 40 and the revolution shaft 15 has a passage 4.
1. The passage 42 and the outlet 43 are respectively provided on the rotation center axis, and the lubricant is injected into the gap 37 through the passage 42 and the outlet 43.

In the bearing device shown in FIG. 3, the rotation of the stirring shaft 10 is transmitted to the rotation center shaft 28 of the rotation bearing mechanism 14 and is borne by the bearing 32, and the revolution of the stirring shaft 10 and the thrust load are revolved around the revolution hollow shaft 29 and the revolution shaft. Shaft (coupling) 15
Is transmitted to the revolution shaft device 13.

Moreover, the lubricant enclosing portion 37 is provided between the outer cylindrical portion 30 and the revolving hollow shaft 29, and the pressure of this lubricant and the low pressure of the material to be treated maintain pressure equilibrium via the seal 34. Penetration of abrasive fine particles is effectively suppressed, and leakage of the lubricant is also prevented.

Further, the rotation bearing device 14 has a structure in which the outer cylinder portion 30 provided with the stirring blade 9 is integrated with the rotation center shaft 28 into the stirring shaft 10, so that the stirring blade 9 can reach the bottom of the container 1. The mixing and stirring action of the material to be treated by the rotation and the revolution is stably and constantly performed, and the action of discharging the material to be treated is smoothly performed.

Further, all the revolutions transmitted to the revolution shaft 15 are borne by the bearing 19 of the revolution bearing mechanism 13, and the combined load of the thrust and radial loads due to the mixing and stirring action of the material to be treated is received by the revolution bearing mechanism 13 and the load fluctuation torque. It has a structure that allows it to rotate without difficulty. Also, a staffing box 1 attached to the bottom of the container 1.
By inserting the gland packing 22 in 7 and tightening it with the packing retainer 23, the contact surface pressure is applied to the revolving vertical shaft 18, the sealing effect is improved, and leakage or intrusion of the material to be processed can be prevented. Further, by providing the fluid lubricant enclosure 24 below the packing retainer 23, absorption of frictional heat from the packing portion 22, further extension of the packing life and reduction of wear of the revolving vertical shaft 18 are surely performed. . Further, by providing the seal 20 above the bearing 19 and arranging the fluid lubrication sealed portion 24 above the seal 20, foreign matter intrusion into the bearing 19 of the revolution bearing mechanism 13 is completely prevented.

Further, the fluid lubricant is injected into the fluid lubrication enclosure 24 of the revolution bearing mechanism 13 and the fluid lubrication enclosure 37 of the rotation bearing mechanism 14 from the injection port 25 and the injection port 39 provided outside the device. It can be performed smoothly even during operation of the device.

(Effects of the Invention) In the mixing stirrer of FIG. 1 in which the conventional universal joint of FIG. 2 is used, it is necessary to replace parts with a new joint after about 1.5 months of operation. By using the bearing device shown in FIG. 3, no abnormalities were observed even after one year of operation. Further, in the conventional bearing structure, it was necessary to install a local exhaust in view of environmental hygiene due to dust leakage from the lower gland portion, but in the device of the present invention, such dust leakage is completely eliminated, which is also significant from the aspect of maintenance management. The effect was obtained.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing the outline of the mixing stirrer, FIG. 2 is an enlarged side view of a conventional universal joint applied to the mixing stirrer of FIG. 1, and FIG. It is an expanded side sectional view of the bearing device of the present invention applied to the mixing agitator of FIG. 1 is a container, 2 is a top plate part, 3 is a drive shaft, 4 is a rotary arm,
5 is a bearing, 7 is a tip, 8 is a universal joint,
9 is a stirring blade, 10 is a stirring shaft, 11 is an inlet, 12 is an outlet, 13 is a revolution bearing mechanism, 14 is a rotation bearing mechanism, 15
Is a revolving shaft (coupling), 16 is a revolving bearing casing, 17 is a stuffing box, 18 is a revolving vertical shaft with a flange, 19, 32 are bearings, 20, 34, 3
6 is a seal, 22 is a gland packing, 24 and 37 are fluid lubricant enclosing parts, 28 is a rotation center part, 29 is a revolving hollow shaft, 30 is an outer cylinder, and 25 and 39 are lubricant injection ports.

Claims (1)

[Claims] 1. A mixing stirrer equipped with a revolving and rotating stirring shaft, wherein one end of the stirring shaft is provided with a revolving bearing mechanism and a revolving bearing mechanism, and the revolving bearing mechanism is curved or curved. The agitating shaft is provided between the one end of the bent revolving shaft and the receiving casing via a fluid lubricant enclosing part, and one end of the stirring shaft has an outer cylinder part and a central shaft part provided via an annular gap. The other end of the revolving shaft has a hollow shaft part that can be fitted into the annular space, and the rotation bearing mechanism and the outer cylinder part of the stirring shaft are provided between the central shaft part of the stirring shaft and the inner surface of the hollow shaft part of the revolving shaft. A bearing device, characterized in that a fluid lubricant enclosure is provided between the outer surface of the revolving shaft and the hollow shaft.