Device for replacing large motor bearing bush

Abstract

The utility model relates to the technical field of steel rolling equipment, in particular to a device for replacing a bearing bush of a large motor, which comprises a bridge-type trolley, a traction lifting lug, solid wheels, pulleys and a lower lifting lug, the bridge-type trolley is a flat rectangular trolley, the bridge-type trolley comprises a bridge-type frame and a reinforcing support, and the reinforcing support is arranged in the bridge-type frame; a lower lifting lug is arranged in the center of the bottom of the bridge-shaped trolley, solid wheels are arranged on the two sides of the bottom of the bridge-shaped trolley, the solid wheels on the two sides are arranged on two rails in a bridging mode, and the two rails are arranged between memorial archways on the two sides between an upper motor and a lower motor of a rolling mill. The traction lifting lugs are arranged on the two sides of the walking direction of the bridge type trolley, the pulleys are arranged on the inner sides of the memorial archways on the two sides, and the traction lifting lugs are connected with the pulleys on the same side through the steel wire rope. The replacement efficiency is improved, and safe disassembly and assembly are achieved.

Description

Technical Field

[0001] This utility model relates to the field of steel rolling equipment technology, and in particular to a device for replacing the bearing bush of a large motor. Background Technology

[0002] In hot rolling mills, roughing mills are essential rolling equipment. The large motors driving roughing mills are typically installed in an upper and lower configuration, which facilitates motor positioning and transmission. However, this upper and lower configuration makes it very difficult to disassemble and assemble the lower motor's bearings. This is because the upper motor's foundation blocks the lower motor's bearings. Due to the large size of the upper motor, cranes cannot lift it. Each replacement of the lower motor's bearings takes a lot of time and requires multiple hand-operated hoists to work simultaneously to move it out. This results in a heavy workload for operators, low efficiency, and long replacement times. Furthermore, the process of moving the bearings can easily cause scratches, collisions, and other mechanical injuries, posing a significant safety hazard to the on-site replacement work.

[0003] Chinese utility model patent CN217229922U, entitled "A Novel Lifting Tool for Steam Turbine Generator End Cover Bearings," discloses a novel lifting tool for steam turbine generator end cover bearings, including a lever. The left side of the lever is threaded with an anti-disengagement lock perpendicular to the lever. The top of the lever is provided with a first lug, and the outside of the lever is provided with a limit groove. A balancing unit is installed on the outside of the lever through an anti-disengagement device, and the top of the balancing unit is connected with a second lug. This new type of hoisting tool for turbine generator end cover bearings has the advantages of being able to reach deep into the bearing for hoisting operations, being lightweight, requiring no overhead crane to avoid it, having precise positioning, and being easy to transport. However, during the use of this hoisting tool, the bearing can only be adjusted using the crane's small hook, requiring an experienced crane operator, and it cannot achieve precise fine-tuning. At the same time, the hoisting tool uses cantilever hoisting, which requires lifting space when replacing large motor bearings. During the hoisting process, the cantilever cannot control the motor bearing, which can easily cause mechanical injuries such as scratches and collisions, posing a great safety hazard to the personnel on site. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides a device for replacing large motor bearings. The device employs a track and bridge structure between the upper motor foundation and the lower motor bearing. It utilizes the space between the upper and lower motors to hoist and transport the lower motor bearing to one side for inspection and replacement. A magnetic contact switch is installed between the bridge frame of the bridge trolley and the upper motor foundation, ensuring accurate hoisting, stable lifting, and preventing scratches or collisions. This allows for quick disassembly and assembly of the lower motor bearing, saving replacement time, improving replacement efficiency, and achieving safe disassembly and assembly.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for replacing the bearing bush of a large motor includes a bridge-shaped trolley, traction lugs, solid wheels, pulleys, and lower traction lugs. The bridge-shaped trolley is a flat rectangular trolley, comprising a bridge frame and a reinforcing bracket, with the reinforcing bracket inside the bridge frame. A lower traction lug is located at the center of the bottom of the bridge-shaped trolley, and solid wheels are located on both sides of the bottom of the bridge-shaped trolley. The solid wheels on both sides are straddled on two tracks, which are located between two side arches between the upper and lower motors of the rolling mill. Traction lugs are located on both sides of the bridge-shaped trolley in the direction of travel, and the pulleys are located inside the side arches. The traction lugs and the pulleys on the same side are connected by steel wire ropes.

[0007] Furthermore, the device for replacing the large motor bearing also includes a magnetic contact switch, which is located at the center of the bridge frame and the center of the upper motor foundation.

[0008] Furthermore, the lower lifting lug is equipped with a steel wire rope, which is connected to the lower motor bearing.

[0009] Furthermore, the pulley and the traction lug are on the same center line.

[0010] Furthermore, the reinforcing bracket is fixed in a cross shape within the bridge-type frame.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1) A track is set between the upper motor foundation and the lower motor, and a bridge-type trolley is set on the track. The bridge-type trolley lifts the lower motor bearing between the upper and lower motors, making full use of the space between the upper and lower motors, saving lifting space, making full use of the lifting space, making lifting easy, having strong lifting capacity, not needing to avoid other equipment, and having high lifting efficiency.

[0013] 2) The use of solid wheels on both sides to roll on the tracks on both sides ensures smooth lifting and avoids major mechanical damage accidents such as scratches and collisions. It also increases the speed of disassembling and assembling bearings, saves a lot of replacement time, improves replacement efficiency, and increases the workload of replacement.

[0014] 3) The bridge structure is sturdy and durable, easy to maintain, reduces the occurrence of safety accidents, meets the needs of on-site safe production, requires little hoisting experience, does not require hoisting adjustments during the hoisting process, improves hoisting efficiency, and reduces hoisting time.

[0015] 4) The magnetic contact switch ensures accurate device positioning, controllable hoisting position, accurate installation of the lower motor bearing, stable hoisting, saves positioning time, improves hoisting efficiency, and enables quick and safe assembly and disassembly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a device for replacing the bearing bush of a large motor as described in this utility model.

[0017] Figure 2 This is a top view of a device for replacing the bearing bush of a large motor as described in this utility model.

[0018] Figure 3 This is a schematic diagram of the disassembly structure of the motor bearing described in this utility model.

[0019] Figure 4 This is a schematic diagram of the structure for lifting the motor bearing as described in this utility model.

[0020] Figure 5 This is a schematic diagram of the motor bearing mounting structure described in this utility model.

[0021] In the diagram: 1. Bridge frame; 2. Reinforcing bracket; 3. Traction lug; 4. Solid wheel; 5. Pulley; 6. Lower lug; 7. Track; 8. Archway; 9. Shaft; 10. Upper motor foundation; 11. Crane; 12. Wire rope; 13. Lower motor bearing; 14. Bearing seat; 15. Magnetic contact switch. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0023] like Figures 1-5 As shown, the working principle of a device for replacing large motor bearings is as follows: A track 7 is set between the upper motor foundation 10 and the lower motor. A bridge-type trolley is set on the track 7, and a lower lifting lug 6 is set below the bridge-type trolley to lift the lower motor bearing 13. Traction lifting lugs 3 are set on the front and rear sides of the bridge-type frame 1. A crane 11 is connected to one side of the traction lifting lug 3 via a steel wire rope 12 to lift the old lower motor bearing 13 away from the bearing seat 14. After maintenance, the crane is connected to the other side of the traction lifting lug 3 via the steel wire rope 12 to lift the new lower motor bearing 13 and install it on the bearing seat 14. A magnetic contact switch 15 is set at the center of the bridge-type frame 1 to contact and position the bearing with the magnetic contact switch 15 at the center of the upper motor foundation 10. The positioning is accurate, the installation is precise, the lifting is stable, and scratches and collisions are avoided. The lower motor bearing can be quickly disassembled and installed, saving replacement time and improving replacement efficiency.

[0024] like Figures 1-2As shown, a device for replacing the bearing bush of a large motor includes a bridge-shaped trolley, traction lugs 3, solid wheels 4, pulleys 5, and lower lifting lugs 6. The bridge-shaped trolley is a flat rectangular trolley, comprising a bridge frame 1 and a reinforcing bracket 2. A cross-shaped reinforcing bracket 2 is installed inside the bridge frame 1 to prevent deformation of the bridge-shaped trolley. Four sets of rotating shafts 9 are symmetrically welded around the trolley, and the rotating shafts 9 are fitted with the solid wheels 4. When using the bridge-shaped trolley to lift the lower motor bearing bush 13, it is necessary to maintain the fit between the solid wheels 4 and the rotating shafts 9. Before use, dry grease is added to the rotating shafts 9 to reduce wear between the solid wheels 4 and the rotating shafts 9. Solid wheels 4 are located on the left and right sides of the bottom of the bridge-shaped trolley. Wheel 4 is straddled on two rails 7. Solid wheel 4 rolls forward on rails 7. The two rails 7 are set between the two side arches 8 in the middle of the upper and lower motors of the rolling mill. When solid wheel 4 rolls on rails 7, mechanical lubricating oil needs to be applied to rails 7 to reduce wear between solid wheel 4 and rails 7. The reinforcing bracket 2 is welded to the lower lifting lug 6 at the center symmetrical position. The lower lifting lug 6 is connected to the lifting lug on the lower motor bearing 13 by steel wire rope 12 for hoisting and fixing. Traction lifting lugs 3 are set on both sides of the bridge frame 1 in the direction of travel. Pulleys 5 are welded to the side arches 8 to facilitate the traction of crane 11 when disassembling and assembling bearings. Pulleys 5 and traction lifting lugs 3 are on the same center line to facilitate the traction and hoisting of lower motor bearing 13.

[0025] Furthermore, the device for replacing the large motor bearing also includes a magnetic contact switch 15, which is located at the center of the bridge frame 1 and the center of the upper motor foundation 10. The magnetic contact switch 15 is used to locate the hoisting position of the bridge trolley.

[0026] like Figure 3 As shown, a method for replacing the bearing bush of a large motor is as follows: When replacing the lower motor bearing bush 13, first loosen the fastening bolts between the lower motor bearing bush 13 and the bearing bush seat 14. The bridge trolley is in hoisting position A. The lower lifting lug 6 under the bridge trolley is hoisted and fixed to the lower motor bearing bush 13 using a steel wire rope 12. Then, one end of another steel wire rope 12 is connected to the traction lifting lug 3 in the inspection and travel direction in front of the bridge frame 1. The steel wire rope 12 passes around the outer circumference of the pulley 5 in the direction of the already connected traction lifting lug 3. The other end of the steel wire rope 12 is connected to the crane 11. The lower motor bearing bush 13 hoisted by the bridge trolley is pulled out together to the hoisting position B by the steel wire rope 12.

[0027] like Figures 4-5As shown, after the lower motor bearing 13 is cleaned and inspected, one end of another steel wire rope 12 is connected to the traction lug 3 at the rear of the bridge frame 1 in the direction of travel. The steel wire rope 12 is wrapped around the outer circumference of the pulley 5 at the other end in the direction of installation. The other end of the steel wire rope 12 is connected to the crane 11. The lower motor bearing 13, which is being lifted by the bridge trolley, is pulled back to the lifting position A by the steel wire rope 12. The position is then determined by the magnetic contact switch 15. The lower lug 6 of the bridge trolley and the lower motor bearing 13 are lifted and placed back onto the bearing seat 14 by the connecting steel wire rope 12. The steel wire rope 12 is then removed. After adjusting the gap between the lower motor bearing 13 and the bearing seat 14, the lower motor bearing 13 is tightened. The disassembly and assembly of the lower motor bearing 13 are then completed.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A device for replacing the bearing bush of a large motor, comprising a bridge-type trolley, a traction lug, solid wheels, pulleys, and a lower lug, characterized in that, The bridge-type trolley is a flat rectangular trolley, comprising a bridge frame and reinforcing supports, with the reinforcing supports installed inside the bridge frame. A lower lifting lug is located at the center of the bottom of the bridge-type trolley, and solid wheels are installed on both sides of the bottom of the bridge-type trolley. The solid wheels on both sides are straddled on two tracks, which are located between the two side arches between the upper and lower motors of the rolling mill. Traction lifting lugs are located on both sides of the bridge-type trolley in the direction of travel, and pulleys are located inside the two side arches. The traction lifting lugs and the pulleys on the same side are connected by steel wire ropes.

2. The device for replacing the bearing bush of a large motor according to claim 1, characterized in that, The device for replacing the large motor bearing also includes a magnetic contact switch, which is located at the center of the bridge frame and the center of the upper motor foundation.

3. The device for replacing the bearing bush of a large motor according to claim 1, characterized in that, The lower lifting lug is equipped with a steel wire rope, which is connected to the lower motor bearing.

4. The device for replacing the bearing bush of a large motor according to claim 1, characterized in that, The pulley and the traction lug are on the same center line.

5. The device for replacing the bearing bush of a large motor according to claim 1, characterized in that, The reinforcing bracket is fixed in a cross shape within the bridge-type frame.

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