Bearing support device for high-speed rotating shaft
Technical Field
The invention belongs to the technical field of powder metallurgy equipment, and particularly relates to a bearing supporting device for a high-speed rotating shaft in plasma rotating electrode powder manufacturing equipment.
Background
The plasma rotary electrode pulverizing method is to melt the front end of a high-speed rotary metal bar by a plasma beam, and then throw out molten liquid drops by the centrifugal force of the high-speed rotation of the metal bar, and atomize and cool the molten liquid drops into powder.
The plasma rotary powder making equipment on the market at present consists of an atomizing chamber with the diameter of about 2-3 meters, a rotary shaft is arranged in the atomizing chamber through a dynamic seal bearing, the rotary shaft is positioned at the central line of the atomizing chamber, the rotary speed is up to 15000 r/min-20000 r/min, but most dynamic seal bearing supporting structures still depend on the traditional bearing supporting structures, namely, the rotary shaft is arranged in the bearing inner ring, and the rotary shaft is supported by two points of the bearing to realize rotation. However, in the practical use process, the rotation speed of the rotating shaft is too high, so that the problem of short service life of the bearing exists in the supporting mode of installing the rotating shaft in the bearing inner ring, and the bearing is often required to be replaced, so that the production efficiency is low. In addition, in actual production, the rotating shaft needs to move along the axial direction, and the supporting mode of installing the rotating shaft in the bearing inner ring makes the contact surface between the rotating shaft and the bearing inner ring large, so that large friction is generated when the rotating shaft moves, a large amount of heat is generated, and the bearing is often damaged.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and provides the bearing supporting device for the high-speed rotating shaft, which adopts a sliding mode of the rotating shaft and a plurality of bearing outer rings to support the rotating shaft, so that the contact area between the bearing and the rotating shaft is reduced, the friction between the bearing and the rotating shaft is reduced, and the service life of the bearing is prolonged.
In order to solve the technical problems, the invention adopts the following technical scheme: a bearing support device for a high-speed rotating shaft, characterized in that: the bearing support assembly comprises a sleeve with a hollow structure and a bushing arranged in the sleeve, wherein a mounting channel for mounting a rotating shaft is formed in the bushing, bearing support assemblies for supporting the rotating shaft are arranged on the bushing and close to two ends of the mounting channel, and each bearing support assembly consists of a plurality of bearing support units uniformly distributed along the circumferential direction of the mounting channel; the bearing support unit comprises a mandrel fixedly mounted on the bushing and a bearing sleeved on the mandrel, wherein the diameter of an inscribed circle among the bearings is smaller than that of a radial circle of the mounting channel.
The bearing support device for a high-speed rotating shaft is characterized in that: a cavity for cooling liquid circulation is arranged between the sleeve and the bushing, and a liquid inlet and a liquid outlet which are communicated with the cavity are formed in the sleeve.
The bearing support device for a high-speed rotating shaft is characterized in that: the two ends of the bushing are respectively provided with a first gland and a second gland for sealing the bushing.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the rotating shaft is supported by the outer rings of the plurality of bearings by arranging the plurality of bearing supporting units, so that the contact area between the bearings and the rotating shaft is reduced, the friction force between the bearings and the rotating shaft is reduced, the heat generated by friction between the rotating shaft and the bearings is easier to dissipate, and the service life of the bearings is prolonged.
2. According to the invention, the sleeve and the bushing are arranged, so that the bearing support assembly is protected, and the service life of the bearing is prolonged.
3. According to the invention, the plurality of bearing support units are uniformly distributed along the circumferential direction of the mounting channel, so that the stability of the rotating shaft in rotation is improved.
In summary, the invention adopts the sliding mode of the rotating shaft and the plurality of bearing outer rings to support the rotating shaft, reduces the contact area between the bearing and the rotating shaft, reduces the friction force between the bearing and the rotating shaft, and prolongs the service life of the bearing.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a use state diagram of the present invention.
Fig. 3 is a cross-sectional view A-A of fig. 2.
Reference numerals illustrate:
1-an installation channel; 2-a bushing; 3-a first gland;
4-1-mandrel; 4-2-bearing; 5-a sleeve;
6-a second gland; 7, a liquid inlet; 8, a liquid outlet;
9-a cavity; 10-rotation axis.
Detailed Description
As shown in fig. 1, 2 and 3, the invention comprises a sleeve 5 with a hollow structure and a bushing 2 arranged in the sleeve 5, wherein a mounting channel 1 for mounting a rotating shaft 10 is arranged on the bushing 2, bearing support assemblies for supporting the rotating shaft 10 are arranged on the bushing 2 and near the two ends of the mounting channel 1, and each bearing support assembly consists of a plurality of bearing support units uniformly distributed along the circumferential direction of the mounting channel 1; the bearing support unit includes a spindle 4-1 fixedly mounted on a bush 2 and bearings 4-2 fitted over the spindle 4-1, and the diameter of an inscribed circle between the plurality of bearings 4-2 is smaller than the diameter of a radial circle of the mounting passage 1.
The mounting path of the rotary shaft 10 is defined by opening the mounting passage 1 in the bush 2. The plurality of bearing support units are uniformly distributed along the circumferential direction of the installation channel 1, so that the support of the rotating shaft 10 is realized, the stability of the rotating shaft 10 during rotation is improved, and the rotating shaft 10 can still be matched with other bearing support units for rotation when one bearing support unit in the plurality of bearing support units fails, so that the risk of instantaneous collapse of the rotating action of the rotating shaft 10 during high-speed rotation is avoided. The bearing supporting unit consists of a mandrel 4-1 fixedly arranged on the bushing 2 and a bearing 4-2 sleeved on the mandrel 4-1, so that the rotating shaft 10 is supported by the outer ring of the bearing 4-2, the contact area between the bearing 4-2 and the rotating shaft 10 is reduced, the heat generated by friction between the rotating shaft 10 and the bearing 4-2 during high-speed rotation is reduced, in addition, the friction force generated by the rotating shaft 10 and the bearing 4-2 during the movement along the axis of the rotating shaft 10 is also reduced, and the plurality of bearings 4-2 are uniformly distributed along the circumferential direction of the mounting channel 1, so that the heat generated by friction between the rotating shaft 10 and the bearing 4-2 is easily dissipated, and the service life of the bearing 4-2 is prolonged. By making the diameter of the inscribed circle between the plurality of bearings 4-2 smaller than the diameter of the radial circle of the installation passageway 1, the contact of the rotation shaft 10 with the inner wall of the installation passageway 1 is avoided while the rotation shaft 10 is supported by the bearings 4-2, and friction of the rotation shaft 10 with the inner wall of the installation passageway 1 is prevented. Through setting up sleeve 5 and bush 2, protected the bearing support unit, reduced external influence to bearing 4-2, prolonged the life of bearing 4-2, make the high-speed rotary motion of bearing 4-2 and rotation axis 10 more stable, reduced the noise volume that the bearing 4-2 sent when rotating with rotation axis 10 high-speed, also prevented that the part piece that splashes when the bearing support unit became invalid from jeopardizing staff's personal safety.
As shown in fig. 1, in this embodiment, preferably, a plurality of sealing rings are disposed between the bushing 2 and the sleeve 5, one end of the sleeve 5 is open, and the other end is a bottom plate with a hollow structure. One end of each mandrel 4-1 is fixed on the bushing 2, two bearings 4-2 are sleeved on the mandrel 4-1, and the bearings 4-2 are fixed by locking nuts arranged on the mandrel 4-1 and the shaft shoulders of the mandrel 4-1. After the bearing supporting unit is fixedly installed on the bushing 2, the bushing 2 is plugged into the sleeve 5 from the opening of the sleeve 5, then one end, close to the opening of the sleeve 5, of the bushing 2 is fixedly connected with the opening end of the sleeve 5 through a screw, as shown in fig. 2, one end of the rotating shaft 10 penetrates into the bushing 2 and penetrates out of the bottom plate of the sleeve 5. As shown in fig. 3, the outer ring of the bearing 4-2 abuts against the rotary shaft 10. In this embodiment, there are ten bearing support units in total, and five bearing support units are respectively provided at both ends of the bush 2, and are uniformly distributed along the circumferential direction of the installation channel 1.
In this embodiment, as shown in fig. 1, a cavity 9 for cooling liquid to circulate is provided between the sleeve 5 and the liner 2, and a liquid inlet 7 and a liquid outlet 8 that are communicated with the cavity 9 are provided on the sleeve 5.
It should be noted that, the rotation shaft 10 and the bearing 4-2 perform high-speed rotation, a large amount of heat is generated in the process, and the cooling liquid is discharged from the liquid inlet 7 to the cavity 9, and then the cooling liquid in the cavity 9 is discharged from the liquid outlet 8, so that the cooling liquid takes away the heat generated by the rotation of the rotation shaft 10 and the bearing 4-2 at high speed, and the service life of the bearing support assembly is prolonged.
As shown in fig. 1, in this embodiment, the two ends of the bushing 2 are respectively provided with a first gland 3 and a second gland 6 for sealing the bushing 2.
The first gland 3 is installed on one end of the bushing 2 near the opening of the sleeve 5, the second gland 6 is installed on one end of the bushing 2 near the bottom plate of the sleeve 5, and the first gland 3 and the second gland 6 are both cover plates with hollow structures. By providing the first gland 3 and the second gland 6 to seal the bushing 2, erosion of dust and moisture to the bushing 2 and bearing support assembly is reduced, extending the service life of the bearing 4-2.
When the invention is used, one end of the rotating shaft 10 sequentially passes through the first gland 3, the mounting channel 1 and the second gland 6 and then passes out of the bottom plate of the sleeve 5. The outer circles of the plurality of bearings 4-2 are abutted on the rotating shaft 10, so that the contact area between the bearings 4-2 and the rotating shaft 10 is reduced, and the friction force between the bearings 4-2 and the rotating shaft 10 is reduced. The plurality of bearings 4-2 have gaps between each other, so that heat generated when the bearings 4-2 and the rotating shaft 10 rotate at a high speed can be conveniently dissipated, the diameter of an inscribed circle between the plurality of bearings 4-2 is smaller than that of a radial circle of the mounting channel 1, the rotating shaft 10 is supported by the plurality of bearings 4-2 and has gaps with the inner wall of the mounting channel 1, in addition, gaps exist between the rotating shaft 10 and the first gland 3, the second gland 6 and the sleeve 5, and the first gland 3 and the second gland 6 respectively cover the two ends of the bushing 2 and seal the bearings 4-2 and the mandrel 4-1 in the bushing 2. Cooling liquid is continuously discharged into the cavity 9 from the liquid inlet 7, and when the cooling liquid starts to be discharged from the liquid outlet 8, the cooling liquid circulates in the cavity 9, so that heat emitted into the sleeve 2 by the rotation of the rotating shaft 10 and the bearing 4-2 at a high speed is continuously taken away, and damage and failure caused by overhigh temperature of the bearing 4-2 are avoided.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.