Shaft end sealing device of powder material mixing equipment and installation method thereof

Abstract

The invention discloses a shaft end sealing device of powder material mixing equipment and an installation method thereof, wherein the shaft end sealing device includes a skeleton oil seal, a gas seal seat, a connecting flange, a gas distribution ring and a shaft retaining ring, and the gas distribution ring passes through The retaining ring for the shaft is set between the end plate of the cavity and the main shaft, the connecting flange is set on the gas distribution ring and fixedly connected with the end plate of the cavity, the air seal seat is set on the outer end of the gas distribution ring and sealed with the connecting flange Fixed connection, the skeleton oil seal is set between the air seal seat and the main shaft, there is an annular hole on the inner end surface of the gas distribution ring, and an annular groove is arranged on the circumferential surface of the outer end section of the air distribution ring, and there are uniformly distributed in the annular groove. The connecting holes arranged in communication with the annular holes are evenly distributed on the circumferential surface of the gas distribution ring with spiral grooves connecting the inner end surface and the annular groove, and an air channel connected with the annular groove is provided on the air seal seat, and at the end of the cavity An end plate passage communicated with the outer peripheral surface of the gas distribution ring is arranged on the plate. The invention can effectively prevent the powder material from leaking into the shaft end, so that the production efficiency is improved and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of powder material mixing equipment, in particular to a shaft end sealing device of powder material mixing equipment and an installation method thereof. Background technique [0002] Such as Figure 4 As shown, the shaft end sealing device in the current powder material mixing equipment is located between the end cover plate a and the main shaft b, and generally adopts a filler + air seal structure, including shaft protection bushing c, stuffing box d, stuffing cover e, The positioning pin f, packing g, quick loose joint h, and the air-tight channel i are arranged between the outer peripheral surface of the shaft protection bushing c and the inner hole of the end cover plate a, although it has the characteristics of mature technology and low cost of use, but in There are following problems in use and cannot be avoided. [0003] 1. The use of packing seals requires high requirements for the outer diameter of...

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Problems solved by technology

[0002] like Figure 4 As shown, the shaft end sealing device in the current powder material mixing equipment is located between the end cover plate a and the main shaft b, and generally adopts a filler + air seal structure, including shaft protection bushing c, stuffing box d, stuffing cover e, The positioning pin f, packing g, quick loose joint h, and the air-tight channel i are arranged between the outer peripheral surface of the shaft protection bushing c and the inner hole of the end cover plate a, although it has the characteristics of mature technology and low cost of use, but in The following problems in use will not be avoided

[0003] 1. Packing seal is adopted, and the outer diameter dimension, surface roughness of the joint of the moving shaft, and the coaxiality processing accuracy of the bearing seats at both ends of the moving shaft are all high, which directly increases the manufacturing cost of the entire equipment

[0004] 2. Since the axial positioning of the packing is achieved by the axial compression of the end cover, this will cause uneven compression force of the packing in the axial direction, causing uneven wear of the packing in the axial direction, and the end cover needs to be pre-tightened in time , resulting in low packing life, high frequency of maintenance or replacement of packing, which directly increases the operating cost of the enterprise

[0005] 3. Once the powder material enters the packing seal device, it is easy to enter the shaft end bearing raceway, damage the bearing, make the bearing scrapped, cause the equipment not to work normally, and directly reduce the production efficiency of the enterprise

[0006] 4. Since the packing is installed in the stuffing box, when the equipment is working, the packing is stationary, while the moving shaft is moving. When the powder material enters the packing sealing device, there will be grinding conditions where the powder particles contact the seal. This accelerates and aggravates the wear of the packing, the moving shaft or the shaft sleeve on the moving shaft. When replacing the packing at high frequency, it is also necessary to replace the moving shaft or repair the shaft sleeve on the moving shaft, which directly reduces the production efficiency of the enterprise.

[0007] 5. With the continuous abrasive wear of the powder material and the outer surface of the moving shaft or the shaft sleeve, the shaft sleeve needs to be replaced after a period of time. Before the replacement of the shaft sleeve on the motor side, the coupling must be disassembled first, and then the shaft sleeve must be removed. Especially when the motor is directly connected to the moving shaft, the motor has to be disassembled in order to disassemble the shaft sleeve, which will consume time and energy for maintenance and repair work, low maintenance efficiency, and indirectly increase the operating cost of the enterprise

[0009] 7. For the powder mixing equipment with packing + air seal structure at the shaft end, it was found that the air seal did not achieve the design effect. The root cause is that the width of the air seal channel is not uniform along the entire circumferential direction, so the sealing air pressure along the entire circumferential direction is also Uneven, or even a local area where the air pressure is not sealed at all, resulting in the phenomenon that the powder leaks into the shaft end sealing device, and the problem of the shaft end seal of the powder material has not been fundamentally solved

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