CN216642806U

CN216642806U - Vertical radial bearing cylinder type block elastic metal plastic bearing bush

Info

Publication number: CN216642806U
Application number: CN202022767191.8U
Authority: CN
Inventors: 邹芸天
Original assignee: Harbin Dayu Metal Plastic Composite Bearing Factory
Current assignee: Harbin Dayu Metal Plastic Composite Bearing Factory
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2022-05-31
Anticipated expiration: 2030-11-17

Abstract

The cylinder type block elastic metal plastic bearing bush of the vertical radial bearing, which belongs to the small class of elastic metal plastic bearing bushes classified by sliding bearings of rotating machinery, is characterized in that a plurality of block elastic metal plastic bearing bushes are fixed on the inner wall of a cylinder of a base body formed by two half cylinder type metal bearing bushes by bolts, each bearing bush sequentially consists of a guide-in surface, an oil inlet arc surface, a bearing arc surface and an oil outlet arc surface according to the rotating direction of a shaft neck, the guide-in surface is an inclined surface which forms an arc angle of 20-35 degrees with the oil inlet arc surface and has a length of more than 3mm, the inlet of the oil inlet arc surface is lower than the bearing surface by 0.15-0.25 mm, the length of the oil inlet arc surface is one fourth to one sixth of the total length of the bearing bush, the outlet of the oil outlet arc surface is lower than the bearing arc surface by 0.10-0.20 mm, and the length of the oil outlet arc surface is not more than one tenth to one twelfth of the total length of the bearing bush. The plastic surface has oil grooves inclined upward along the direction of the shaft neck. The invention can effectively prevent the edge effect of the plastic surface and ensure the safe and reliable operation of the bearing.

Description

Vertical radial bearing cylinder type block elastic metal plastic bearing bush

Technical Field

Belongs to a vertical radial bearing cylinder type block-type elastic metal plastic bearing bush belonging to the small class of elastic metal plastic bearing bushes classified by sliding bearings of rotating machinery,

background

The thrust elastic metal plastic bearing bush of the vertical hydroelectric generating set is already applied in China for more than twenty years, and a good operation effect is obtained. In view of the superior performance of the elastic metal plastic tile, the application trend of the elastic metal plastic tile is also developed towards the centripetal radial guide bearing of the vertical hydroelectric generating set. The centripetal radial guide bearing of the vertical hydroelectric generating set is divided into a block type and a cylinder type. Large units generally adopt a block type structure. The small-sized unit generally adopts a cylindrical bearing bush structure. The cylindrical bearing bush structure is divided into a cylindrical integral bearing bush and a cylindrical block bearing bush. The cylindrical integral bearing bush is a bearing alloy brazed on the inner circular wall and composed of two half cylindrical metal bearing bushes and is a bearing bush applied in the prior art. The cylinder type block bearing bush is formed by fixing a plurality of circular arc bearing bushes on the inner circular wall formed by two half cylinder type metal bearing bushes by bolts, wherein each bearing bush is formed by brazing bearing alloy on the inner circular arc of the circular arc metal tile. The cylinder type block type bearing bush is a new product which appears recently. The cylinder type block bearing bush has the following progress compared with the cylinder type integral bearing bush: the partitioned bearing bushes are fixed on the inner circular walls of the two half cylindrical metal bearing bushes by bolts, and the surface abrasion caused by the operation of the bearing bushes can be solved by adopting a method of detaching the fixing bolts of the bearing bushes and adding gaskets at the backs of the bearing bushes for fixing. This is not achievable with cylindrical integral bearing shells. So that the use of the barrel type segment type bearing bush is gradually increasing. In view of the superior performance of the resilient metal-plastic tiles, there has been a trend to apply the resilient metal-plastic tile technology to the barrel-type segmented bearing shells. However, in the application, the problem still occurs in the early stage of the application of the elastic metal plastic bearing bush, namely, the bush burning accident caused by the edge effect influence, namely the edge of the plastic surface is tilted. Therefore, the surface of each elastic metal plastic tile of the cylinder type block plastic bearing bush should be preset with a profile capable of preventing the plastic surface from generating the influence of the edge tilting effect, namely a plastic reasonable profile.

The problems to be solved are as follows: provides a cylinder type block elastic metal plastic bearing bush of a vertical radial bearing with a reasonable profile. The occurrence of tile burning accidents is prevented.

Disclosure of Invention

A cylinder type block-type elastic metal plastic bearing bush of a vertical radial bearing belongs to the subclass of elastic metal plastic bearing bushes classified by sliding bearings of rotating machinery, and is characterized in that a plurality of block-type elastic metal plastic bearing bushes are fixed on the inner wall of a cylinder of a base body formed by two half cylinder type metal bearing bushes by bolts, each bearing bush sequentially comprises a guide-in surface, an oil inlet arc surface, a bearing arc surface and an oil outlet arc surface according to the rotating direction of a journal, the guide-in surface is an inclined surface which forms an arc angle of 20-35 degrees with the oil inlet arc surface and has a length larger than 3mm, the inlet of the oil inlet arc surface is lower than the bearing surface by 0.15-0.25 mm, the length of the oil inlet arc surface is one fourth to one sixth of the total length of the bearing bush, the outlet of the oil outlet arc surface is lower than the bearing arc surface by 0.10-0.20 mm, and the length of the oil outlet arc surface is not larger than one tenth to one twelfth of the total length of the bearing bush. The plastic surface has oil grooves inclined upward along the direction of the shaft neck.

Creativity and beneficial effects: the novel plastic surface reasonable molded line which has determined good application effect in practice is applied to the novel vertical radial bearing cylinder type block elastic metal plastic bearing bush. After the cylindrical block-type elastic metal plastic bearing bush of the lower guide bearing of the 20MW vertical hydroelectric generator of the Yizhou wave-drawing hydropower station in Guangxi is transformed by applying the technology, the phenomenon of bush burning which has been generated in the past is avoided, and the temperature of the bush is reduced by 12 ℃. The vibration phenomenon which is usually generated in the past does not occur when the load is increased or the load is thrown excessively.

Drawings

Figure 1 is a schematic view taken along the joint plane of the two bearing halves. The semicircular metal tile base 1 is connected into a whole by a fastening bolt 1-1 and a positioning pin 1-2. The upper and lower sides of the arc-shaped metal tile 2 are provided with counter bores 2-1. The inner arc surface of the metal tile 2 is brazed with an elastic metal plastic bearing surface 3, an oil inlet arc surface 3-1, a bearing arc surface 3-2, an oil outlet arc surface 3-3 and an oil groove 3-4. A cross-section taken along the centerline of counterbore 2-2 in metal tile 2 is shown at A, A.

Fig. 2 is a cross-sectional view a-a of fig. 1. In the figure, an elastic metal plastic bearing bush surface 3 is brazed on an arc-shaped metal tile 2, and a bolt 5 is screwed on the inner circular surface of a metal tile base 1 through a counter bore and a gasket 4 on the arc-shaped metal tile 2.

FIG. 3 is a sectional view of a plastic shoe surface, in which an elastic metal plastic bearing surface 3 is brazed to the inner circular surface of a metal tile 2, and the total radial length L of the plastic bearing surface 3. The length of the oil inlet circular arc surface 3-1 is L1, and the height of the oil inlet circular arc surface and the bearing surface 3-3 is h 1. The radius R of the bearing circular arc surface 3-2, the length h2 of the oil outlet circular arc surface 3-3 and the low degree L2 of the bearing surface 3-3. The oil inlet guide surface length a.

Detailed Description

The following description is given by taking the attached drawings and the technical modification of the cylindrical block-type elastic metal plastic bearing bush of the lower guide bearing of the 20MW vertical hydroelectric generator in the Yizhou wave hydropower station in Guangxi as an example.

7.1, according to the actual determination parameters of the cylindrical block type elastic metal plastic bearing bush of the lower guide bearing of the vertical hydroelectric generator of the wave-pulling hydropower station, the following parameters are determined: the shaft neck diameter is 600mm, and the cylindrical metal tile base 1 is processed by 2 steel castings as shown in figure 1. The upper part is provided with a flange with the outer diameter of 1350mm, a connecting spigot with the outer diameter of 900mm and a tile body with the outer diameter of 850 mm. The total height is 600 mm. The inner circle is provided with an upper boss and a lower boss which are matched with the metal tiles 2, the inner diameter of the boss is 675mm, the height of the boss is 60mm, the lower boss is provided with a bottom edge platform with the diameter of 660mm, and the height of the bottom edge platform is 50 mm. Each boss internal diameter evenly distributes 16M 20mm screw holes. There are 8 divided metal tiles 2. The upper and lower parts of each metal tile 2 are respectively provided with 2 counter bores 2-1, the diameter of each counter bore is 40mm, the depth of each counter bore is 20mm, and the diameter of each screw hole is 21 mm. The center distance of the 2 counterbores 2-1 is 22.5 degrees. The total radial length L of each elastic plastic surface 3 is 210mm, and the axial length is 400 mm. The length L1 of the oil inlet arc surface 3-1 is 50mm, and the low-degree h1 of the oil inlet arc surface and the bearing surface 3-3 is 0.15-0.20 mm. The radius R of the bearing circular arc surface 3-2 is 300(+0.12+0.15) mm, the length h2 of the oil outlet circular arc surface 3-3 is 20mm, and the distance L2 of the oil outlet circular arc surface and the bearing surface 3-2 is 0.10-0.15 mm. The length a of the leading-in surface of the oil inlet is 4mm, and the leading-in surface and the oil inlet arc surface form an arc angle of 20-35 degrees. The two oil grooves 3-4 are inclined at an angle of 60 degrees, have a width of 4mm and a depth of 2mm,

7.2 drawing the pattern of the cylinder type block elastic metal plastic bearing bush according to the parameters.

7.3 casting a cast steel blank of the cylindrical metal tile base 1 according to a pattern and then machining to size.

7.4 cast steel blanks of eight metal tiles 2 are pattern cast and then machined to size. The above-mentioned size has a groove for soldering elastic metal plastic tile surface 3, its cambered surface diameter is 620 (-0.10- +0.10) mm, and its height is 400 mm.

7.5 make 8 elastic metal plastic tiles 3, each 10.5mm thick rectangle 210x398 mm.

7.6 each metal tile 2 and the elastic metal plastic tile surface 3 are heated to 230 ℃ simultaneously for tin soldering and brazing to be firm.

7.7 fixing 8 brazed metal tiles 2 on a boss on the inner wall of a cylindrical metal tile base 1 by adopting a bolt 5, aligning according to the diameter of 900mm of the outer diameter of a connecting spigot, turning the surface of the plastic tile to the diameter of 600 (+ 0.25-0.30) mm, and having the roughness of Ra0.08.

7.8 the 8 metal tiles 2 are disassembled, and the length L1 of the oil inlet arc surface 3-1 is drawn as a 50mm side line and the length h2 of the oil outlet arc surface 3-3 is drawn as a 20mm side line by a marking pen on each plastic surface 3. And then scraped with an arc blade of 300mm R. The low-degree h1 between the scraped oil circular arc surface 3-1 and the bearing surface 3-3 is 0.15-0.20 mm. The low-degree L2 between the oil outlet circular arc surface 3-3 and the bearing surface 3-2 is 0.10-0.15 mm.

7.9 two oil grooves 3-4 are respectively drawn on each plastic surface 3 by a marking pen, the oil grooves are inclined by 60 degrees, the width is 4mm, and the scraping depth is 2 mm.

7.10 each plastic surface 3 is respectively drawn with a marking pen to form a side line with the length a of the leading-in surface of the oil inlet being 4mm, and the blade scrapes the leading-in surface to form an arc angle of 20-35 degrees with the arc surface of the oil inlet. The remaining three plastic edges are chamfered R3 mm.

7.11 cleaning and installing the manufactured 8 plastic tiles on the tile base 1. Coating rust preventive oil on the plastic cloth, and packaging and warehousing.

Claims

1. A cylinder type block-type elastic metal plastic bearing bush of a vertical radial bearing is characterized in that a plurality of block-type elastic metal plastic bearing bushes are fixed on the inner wall of a cylinder of a matrix consisting of two half cylinder type metal bearing bushes by bolts, and each bearing bush consists of a guide-in surface, an oil inlet arc surface, a bearing arc surface and an oil outlet arc surface in sequence according to the rotation direction of a shaft neck, wherein the guide-in surface forms an inclined surface with the oil inlet arc surface at an angle of 20-35 arc degrees and has a length of more than 3mm, an inlet of the oil inlet arc surface is lower than the bearing surface by 0.15-0.25 mm, the length of the oil inlet arc surface is one fourth to one sixth of the total length of the block bearing bush, an outlet of the oil outlet arc surface is lower than the bearing arc surface by 0.10-0.20 mm, and the length of the oil outlet arc surface is not more than one tenth to one twelfth of the total length of the block bearing bush.

2. A radial bearing cartridge type segmented elastomeric metal-plastic bushing according to claim 1, wherein the plastic surface has oil grooves inclined upward in the direction of the journal.