The invention discloses a rotary support for a crane, wherein the rotary support includes an inner ring, an outer ring and a rolling body. The inner ring is located at the lower part of the outer ring, the rolling body is arranged between the inner ring and the outer ring; the outer side of the rolling body is movably connected with a retainer, and the retainer is located between the inner ring and the outer ring; the surface of the outer ring is provided with an oil inlet, the bottom of the outer ring is provided with an oil pipe, the bottom of the oil pipe is provided with an oil outlet, andthe oil outlet is located at the upper part of the rolling body; the bottom of the inner ring is connected with a reinforcing rib. The effect of lubrication is ensured, inconvenient rotation of the rolling body caused by excessive oil amount is prevented, the smooth rotation of the rotary support is ensured, the instability of the interior of the rotary support caused by local overheating is avoided, the service life of the rotary support is prolonged, the stability of the inner ring can be increased, the damage of the inner ring produced during wear is reduced, the inner ring is protected, the high-efficiency work of the rotary support is ensured, the stability of the whole rotary support is increased by a reinforcement plate, and the stability of the rotary support structure is ensured.

Rotary support for crane

The invention discloses a method and device used for guaranteeing the wall thickness of a metal plate forming thin-wall ring part. The device comprises a ring body (1) and a pressing plate (2); the upper end face of the ring body (1) is a plane which is provided with an annular groove; the cross section shape of the annular groove is consistent with the cross section shape of the non-machining portion of the thin-wall ring part; the pressing plate (2) is located above the annular groove; and the bottom face of the pressing plate (2) is a plane, and the pressing plate (2) can move in the axialdirection and the radial direction of the ring body (1). During machining, firstly, the planeness standard exceeding position of the to-be-machined portion of the metal plate forming thin-wall ring part is compressed, and after it is guaranteed that the planeness of the portion is qualified, then remaining non-compressed positions are machined to the required thickness; and then the positions machined to the required thickness are compressed, and after it is guaranteed that the planeness of the portions is qualified, remaining non-compressed positions are machined to the required thickness.

Method and device used for guaranteeing wall thickness of metal plate forming thin-wall ring part

The invention provides a technology for processing an aluminum alloy large annular workpiece with a countersink by utilizing an equal-thickness plate and belongs to the field of a cold processing industry. The technology comprises the following steps: (1) purchasing a sheet material which is as thick as a part to process the large annular workpiece with the countersink; (2) realizing the requirements of rapidly positioning, avoiding locking of a processing position and shortening the length of a cutter by utilizing a special tool; (3) uniformly locking and compacting the workpiece; (4) realizing drawing requirements by combining an effective technological method. The difficulty of processing parts by adopting the equal-thickness plate is overcome and batch production is realized; no abnormal conditions occur, and the material cost and the processing cost are greatly reduced.

Processing technology for processing aluminum alloy large annular workpiece with countersink by utilizing equal-thickness plate

The invention discloses a grease leakage preventing seal structure of a rotating disk bearing of a fan. The grease leakage preventing seal structure comprises an inner sleeve ring and an outer sleeve ring which are matched together; one or more rows of raceways which can accommodate rolling bodies are arranged between the inner sleeve ring and the outer sleeve ring; seal rings are arranged between the inner sleeve ring and the outer sleeve ring, on two sides of the corresponding raceway; one or more grease discharging holes are formed in the seal rings on one side or two sides of each raceway, and an oil return system is connected to the seal rings on one side or two sides of the corresponding raceway through the grease discharging holes; the oil return system mainly consists of one or more oil guide pipes, one or more oil path control valves and one or more oil collectors; the upstream end of each oil guide pipe is in sealed connection to the corresponding grease discharging hole in the corresponding seal ring, and the downstream end of each oil guide pipe is in sealed connection to the corresponding oil collector; and each oil path control valve is arranged on the corresponding oil guide pipe. Under the premise that the pressure resistance limit of the seal rings does not need to be improved, the grease leakage preventing seal structure disclosed by the invention can be adapted to working conditions of various grease discharging resistances, is good in seal effects, and stable and reliable in running process, and can effectively prevent lubricating grease in the raceways from leaking outwards out of order.

Grease leakage preventing seal structure of rotating disk bearing of fan

The invention discloses a machining process of a large-scale steel structure rotating disc frame. According to the process, through secondary positioning treatment on the rotating disc frame, the problem that a large-scale steel structure component cannot be machined on limited equipment is solved; on a machine tool, through secondary positioning machining, the machine tool occupies 224 hours during the single working time, 112 hours is needed after the frame is taken down from the machine tool, if field machining equipment is rented, the single equipment needs 1600 hours of the machining working time, so the single equipment saves 1264 (1600-224-112) hours, and the delivery period is ensured; auxiliary supporting material generated by using the field equipment for machining is reduced byabout 2 tons, and the cost of setting up scaffolds is reduced; and the problem that the field machining equipment cannot meet the precision is solved.

Machining process of large-scale steel structure rotating disc frame

A processing method of a super-large-diameter multi-segment toothed ring relates to the field of processing techniques of multi-segment toothed rings and comprises the technological processes of blank segmentation, end surface rough-turning, low-temperature tempering, end surface finish-turning, excircle and inner hole milling, drilling processing and tooth processing. According to the processing method of the super-large-diameter multi-segment toothed ring, the problems of deformation and out-of-tolerance dimension in the processing process of the super-large-diameter multi-segment toothed ring are radically solved, the production process is easy to realize, the product qualification rate is extremely high, the production cost and the purchase cost are lowered, and the production efficiency is improved.

Processing method of super-large-diameter multi-segment toothed ring

The utility model discloses a four point contact ball formula slewing bearing on subdivision formula plane, it includes shang quan and xiaquan, shang quan include two upper portion half -turns and two lower part half -turns respectively with lower ring, inlay the merga pass connecting screw between two upper portion half -turns and connect with the taper bolt, inlay merga pass connecting screw and taper bolt connection between two lower part half -turns, be provided with spherical raceway between upper and lower the circle, steel ball that a plurality of ball formula spacing blocks of packing into wrapped up in the raceway. The utility model discloses simple structure, convenient to use have realized the simple and convenient installation of slewing bearing in the finite space, have guaranteed to bear, and automatic centering not only satisfies the requirement that machinery maximized, can further extend slewing bearing's use field moreover.

Liu Shuhui

Papers

Processing method of super-large-diameter multi-segment toothed ring

Four point contact ball formula slewing bearing on subdivision formula plane