Dismounting device based on bearing inner ring positioning

Abstract

According to the dismounting device based on bearing inner ring positioning provided by the utility model, a jacking mechanism can be quickly transformed into a device with a dismounting function on a project site under complex working conditions, bearings of different specifications and models can be conveniently and quickly dismounted for damaged bearings on the premise of not dismounting a motor end cover, and the working efficiency is improved. The device comprises a connecting disc and a plurality of connecting parts, one end face of the connecting disc abuts against a piston rod of the jack, one end of each connecting part is provided with a protrusion in the radial direction of the bearing, the protrusion can conveniently stretch into a gap outside the bearing inner ring to make contact with the surface of the bearing inner ring to form a stress point, and the length of the connecting parts can be fixed. And the length-adjustable connecting part can also be made into a length-adjustable structure, and the length-adjustable connecting part is made into a connecting rod which penetrates through a hole in the connecting disc in a threaded manner and then is fixed with a nut.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet motor devices, in particular to a disassembly device based on positioning of a bearing inner ring. Background Art

[0002] Permanent magnet motors have the advantages of high efficiency and energy saving, large starting torque, strong overload capacity, small footprint, and maintenance-free. They have been widely used in coal mines, cement, steel mills, power plants, docks, chemical industries, etc. The on-site environment in these fields is relatively harsh, and most of them are heavy-load conditions. High-power permanent magnet motors are used. After long-term operation, the bearings are prone to wear and damage, and the bearings need to be replaced.

[0003] The rotor of the permanent magnet direct drive motor uses a large number of permanent magnets, so its size and weight are relatively large. Regardless of whether the space on site is limited, it is difficult to hoist or transport it. In addition, for permanent magnet motors exported to foreign countries, the transportation cost is increased and the return to the factory for repair is long. These factors make it difficult to return many permanent magnet direct drive motors for repair. How to quickly disassemble and replace damaged bearings at the project site? The first problem is that due to the large number of permanent magnets used on the rotor and the heavy weight of the rotor, the positive pressure on the bearing is large; secondly, the inner ring of the bearing and the shaft are generally interference fit, and the friction force on the bearing during disassembly is very large, making it difficult to disengage the bearing; in addition, the on-site environment is limited, and there are no special disassembly tools in the factory. Under the premise that it is inconvenient to remove the motor end cover, it makes bearing disassembly more difficult.

[0004] The current equipment for disassembling bearings at project sites has the following disadvantages:

[0005] 1. Most of the existing technologies use chucks, snap rings, and claws to hold the outer ring of the bearing, which is difficult to implement on site without removing the motor end cover. Once the bearing needs to be replaced on site, the end cover needs to be removed, which takes a long time;

[0006] 2. The device for disassembling the bearing is complicated and has many mating surfaces;

[0007] 3. The bearing cannot be buckled or the inner ring of the bearing cannot be pressed tightly, and the bearing will slip off when force is applied;

[0008] 4. Poor versatility. For bearings of different models and sizes, it is necessary to replace the device with the corresponding aperture size. Summary of the invention

[0009] In order to effectively solve the above problems, the utility model provides the following technical solutions without removing the motor end cover at the project site.

[0010] A disassembly device based on positioning the inner ring of a bearing comprises a connecting plate and a plurality of connecting parts, wherein one end face of the connecting plate bears against the piston rod of a jack, a raised part of the connecting part extends into a gap outside the inner ring of the bearing to buckle the inner ring of the bearing, and a connecting rod of the connecting part is threadedly passed through a hole on the connecting plate and fixed to a nut.

[0011] Furthermore, the protrusion at one end of the connecting part along the radial direction of the bearing is a protrusion, which can be a trapezoidal shape, a tooth shape, an arc shape or a boss shape, and the protrusion is quenched. The protrusion of the connecting part and the connecting rod can be separated or combined, and a positioning platform is provided on one side of the connecting rod of the connecting part.

[0012] Furthermore, the end surface of the connecting disk is provided with through holes with different pitch circle diameters and evenly distributed around the circumference, and the diameter of the through holes is larger than the diameter of the connecting rod of the connecting portion.

[0013] Furthermore, according to the type of bearing, the protrusion of the connecting part and the connecting rod are selected to be flexibly combined, and the number N of the connecting parts is configured according to the force applied to the bearing, where N≥2.

[0014] The utility model has the following beneficial effects:

[0015] 1) The bearing disassembly device designed by the utility model has a simple composition and few mating surfaces. It can be used on project sites under complex working conditions and can disassemble bearings of different specifications and models conveniently and quickly without removing the motor end cover, thereby improving work efficiency.

[0016] 2) The raised portion of the connection part designed by the utility model has a high hardness after quenching treatment and can effectively hold the inner ring of the bearing. The device has good stability and ensures that the bearing does not slip when subjected to force.

[0017] 3) The end face of the connecting plate designed in the utility model has through holes with different pitch circle diameters and evenly distributed around the circumference, and the raised portion of the connecting portion and the connecting rod can be quickly separated or combined, which can meet the disassembly of bearings of different models and sizes, saving materials and improving the versatility of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a structural schematic diagram of the first embodiment of the utility model.

[0020] Figure 2 It is a three-dimensional schematic diagram of the connecting portion of the first embodiment of the utility model.

[0021] Figure 3 For this utility model Figure 1 Enlarged view of point A in the middle.

[0022] Figure 4 This is a structural schematic diagram of the second embodiment of the utility model.

[0023] Figure 5 It is a three-dimensional schematic diagram of the connecting portion of the second embodiment of the utility model.

[0024] Figure 6 This is a structural schematic diagram of the third embodiment of the present utility model.

[0025] Figure 7 It is a three-dimensional schematic diagram of the connecting portion of the third embodiment of the utility model.

[0026] Figure 8 This is a structural schematic diagram of the fourth embodiment of the present utility model.

[0027] Fig. 9 It is a three-dimensional schematic diagram of the connecting portion of the fourth embodiment of the utility model.

[0028] Fig.10 This is the front view of the connection disk of the utility model.

[0029] Explanation of reference numerals: 1-motor end cover, 2-bearing inner cover, 3-shaft, 4-connecting part, 41-protrusion, 42-connecting rod, 5-connecting plate, 6-jack. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] The utility model is further described in detail below in conjunction with the embodiments. The advantages and features of the utility model will become clearer as the description proceeds. However, these embodiments are merely exemplary and do not constitute any limitation to the scope of the utility model. It should be understood by those skilled in the art that the details and forms of the technical solution of the utility model may be modified or replaced without departing from the spirit and scope of the utility model, but these modifications and replacements all fall within the scope of protection of the utility model.

[0033] Embodiment 1, as Figure 1-3 As shown, the present embodiment provides a disassembly device based on the positioning of the inner ring of the bearing, comprising a connecting plate 5 and a plurality of connecting parts 4, wherein one end face of the connecting plate 5 bears against the piston rod of the jack 6, and the raised part 41 of the connecting part 4 is trapezoidal in shape, which is extended into the gap outside the inner ring of the bearing to buckle the inner ring of the bearing, and the connecting rod 42 of the connecting part 4 is threaded through the hole on the connecting plate 5 and fixed with a nut. First, remove the terminal box and the outer bearing cover installed on the motor end cover 1, and then screw the bolts into the corresponding holes on the motor end cover 1 to fix the inner bearing cover 2; use a flame cutting machine to cut off the N balls of the corresponding bearing at N, N≥2 positions evenly distributed on the circumference; sequentially pass the connecting rods 42 of the N connecting parts 4 through the holes on the connecting plate 5 and fix them with nuts; extend the raised parts 41 of the N connecting parts 4 into the gaps on the outside of the inner ring of the bearing corresponding to the N balls cut off to buckle the inner ring of the bearing; then install the jack 6 between the shaft end and the connecting plate 5, and after centering and aligning, slowly pressurize the jack 6 so that the piston rod of the jack 6 fits with the connecting plate 5 until the bearing is removed. The bearing removal device designed by the utility model has a simple composition and few mating surfaces. It can be used on project sites under complex working conditions to conveniently and quickly remove bearings of different specifications and models without removing the motor end cover 1, thereby improving work efficiency.

[0034] like Figure 4-9As shown, it is another different embodiment of the utility model, the protrusion 41 of the connecting part 4 can be in the shape of teeth, arc or boss, and the protrusion is quenched to enhance the hardness, so that it can effectively buckle the inner ring of the bearing, the device has good stability, and ensures that the bearing does not slip under stress. The protrusion 41 of the connecting part 4 and the connecting rod 42 can be separated or combined, and the quick-change protrusion 41 can be flexibly combined with the connecting rod 42 to adapt to bearings of different specifications and models. In the first embodiment, the bearing is a self-aligning roller bearing, the inner ring of which is an arc surface, and the edge rib angle is greater than 90°, and a trapezoidal protrusion 41 is selected to be combined with a connecting rod 42; in the second embodiment, if the bearing is a tapered roller bearing, the inner ring of which is an inclined surface, and the edge rib angle is less than 90° and is sharp-toothed, a tooth-shaped protrusion 41 is selected to be combined with a connecting rod 42; in the third embodiment, if the bearing is a deep groove ball bearing, the inner ring of which is an arc surface, a circular arc-shaped protrusion 41 is selected to be combined with a connecting rod 42; in the fourth embodiment, if the bearing is a double-row cylindrical roller bearing, the inner ring of which is a straight surface and is concave-convex, a right-angle boss-shaped protrusion 41 is selected to be combined with a connecting rod 42. The number N of the connecting parts 4 is configured according to the bearing force, and N≥2. A positioning platform is provided on one side of the thread of the connecting rod 42 of the connecting part 4, so that it can be pushed into place when assembled with the connecting plate 5.

[0035] like Fig.10 As shown, the end surface of the connecting disk 5 is provided with through holes with different pitch circle diameters and evenly distributed around the circumference, and the diameter of the through holes is larger than the diameter of the connecting rod of the connecting part, thereby meeting the requirements for disassembly of bearings of different sizes and improving the versatility of the device.

[0036] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A disassembly device based on the positioning of the inner ring of a bearing. In the case where the motor end cover is not removed at the project site, the existing lifting mechanism can be quickly transformed into a device with a disassembly function during maintenance, including a connecting plate and several connecting parts, characterized in that: One end face of the connecting plate bears against the piston rod of the jack, the raised portion of the connecting part extends into the gap outside the inner ring of the bearing to buckle the inner ring of the bearing, and the connecting rod of the connecting part is threaded through the hole on the connecting plate and fixed with a nut.

2. A disassembly device based on bearing inner ring positioning according to claim 1, characterized in that: The protrusion at one end of the connecting portion along the radial direction of the bearing is a protrusion, which can be in a trapezoidal shape, a tooth shape, an arc shape or a shape with a boss, and the protrusion is quenched.

3. A disassembly device based on bearing inner ring positioning according to claim 1, characterized in that: The protruding portion of the connecting part and the connecting rod can be separated or combined, and a positioning platform is arranged on one side of the connecting rod of the connecting part.

4. A disassembly device based on bearing inner ring positioning according to claim 1, characterized in that: The end surface of the connecting disk is provided with through holes with different pitch circle diameters and evenly distributed around the circumference, and the diameter of the through holes is larger than the diameter of the connecting rod of the connecting part.

5. The disassembly device based on bearing inner ring positioning according to claim 1 is characterized in that: According to the bearing type, the protrusion of the connecting part and the connecting rod are selected for flexible combination, and the number N of the connecting parts is configured according to the force size of the bearing, and N≥2.

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