Auxiliary welding device for squirrel-cage motor rotor

Abstract

The utility model relates to the technical field of squirrel-cage motor rotors, in particular to an auxiliary welding device for a squirrel-cage motor rotor. In order to solve the problem that gaps are easy to appear between silicon steel sheets when a conducting bar and an end ring in a squirrel-cage motor rotor are welded in the prior art, the utility model provides the squirrel-cage motor rotor welding auxiliary device which comprises a sleeve barrel and a plurality of bolts matched with hoisting holes in the end surface of a non-transmission end of a rotating shaft, a plurality of pressing holes matched with the bolts are formed in the barrel bottom of the sleeve barrel. According to the utility model, the sleeve barrel, the bolt and the original hoisting hole structure on the rotating shaft are ingeniously utilized, and the non-transmission end rotor pressing plate is pressed and positioned when the conducting bar and the end ring are welded, so that the problem of gaps between silicon steel sheets caused by loosening of the non-transmission end rotor pressing plate when the conducting bar and the end ring are welded is avoided, and the service life of the silicon steel sheets is prolonged. Therefore, the overall quality of the squirrel-cage rotor is ensured; meanwhile, the structure is simple, cost is low, and repeated use can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of squirrel-cage motor rotors, and specifically relates to a welding auxiliary device for a squirrel-cage motor rotor. Background Technique

[0002] A squirrel-cage motor is a type of three-phase asynchronous motor, and the squirrel-cage rotor is the rotating part of the squirrel-cage motor. Due to its simple structure, the squirrel-cage rotor is widely used. As Figure 1 shown, the squirrel-cage motor rotor includes a rotating shaft 3, a rotor core 8, bars 7 and end rings 6, a non-driving-end rotor pressing plate 4, and a driving-end rotor pressing plate 5. The rotor core 8 is formed by laminating multiple silicon steel sheets after stamping. The two rotor pressing plates are respectively hot-fitted at both ends of the rotating shaft 3 and respectively pressed against both end faces of the rotor core 8. A positioning shoulder 9 is provided at the driving end of the rotating shaft 3, and the driving-end rotor pressing plate 5 is pressed between the driving end of the rotor core 8 and the positioning shoulder 9. At the same time, for easy hoisting, multiple axially arranged hoisting holes are provided on both end faces of the rotating shaft 3. During installation, when welding the bars 7 and the end rings 6, the welding temperature is as high as 700°C, while the hot-fitting temperature of the two rotor pressing plates on the rotating shaft 3 is about 200°C. Therefore, the two rotor pressing plates are prone to thermal expansion, and the two rotor pressing plates are prone to displacement, so that gaps are likely to appear between the silicon steel sheets, thereby reducing the overall quality of the squirrel-cage rotor and reducing the overall use effect of the squirrel-cage motor. Summary of the Invention

[0003] The utility model provides a welding auxiliary device for a squirrel-cage motor rotor to solve the problem that gaps are likely to appear between silicon steel sheets when welding the bars and the end rings in the squirrel-cage motor rotor in the prior art.

[0004] The utility model is implemented by adopting the following technical scheme:

[0005] A welding auxiliary device for a squirrel-cage motor rotor includes a sleeve, and a plurality of bolts adapted to the hoisting holes on the non-driving-end face of the rotating shaft. The inner diameter of the sleeve is larger than the inner diameter of the non-driving-end rotor pressing plate and smaller than the outer diameter of the non-driving-end rotor pressing plate. The outer diameter of the sleeve is smaller than the outer diameter of the non-driving-end rotor pressing plate. The axial distance between the port end face of the sleeve and the inner surface of the barrel bottom is greater than or equal to the axial distance between the non-driving-end face of the non-driving-end rotor pressing plate and the non-driving-end face of the rotating shaft. A plurality of pressing holes adapted to the bolts are provided on the barrel bottom of the sleeve.

[0006] During use, after the rotating shaft, the rotor core, and the non-driving end rotor pressing plate are installed, when the bars are welded to the end ring, this sleeve needs to be sleeved on the non-driving end of the rotating shaft, and the port of the sleeve is coaxially pressed against the non-driving end rotor pressing plate at the non-driving end. Then, the bolt is passed through the pressing hole and tightened in the lifting hole on the end face of the non-driving end of the rotating shaft, thereby realizing the pressing and positioning of the non-driving end rotor pressing plate. When the bars are welded to the end ring, even if the non-driving end rotor pressing plate and the rotor core expand thermally, the non-driving end rotor pressing plate will not move due to the positioning effect of this device, thus avoiding the appearance of gaps between the silicon steel sheets and ensuring the overall quality of the squirrel-cage rotor.

[0007] Further, there are five pressing holes. There are 5 lifting holes on the end face of the non-driving end of the rotating shaft, so 5 pressing holes can be set to ensure the pressing effect of the sleeve on the non-driving end rotor pressing plate as much as possible.

[0008] The beneficial effects produced by the present utility model are as follows: The present utility model cleverly utilizes the structures of the sleeve, the bolt, and the original lifting hole on the rotating shaft to press and position the non-driving end rotor pressing plate when the bars are welded to the end ring, avoiding the problems of loosening of the non-driving end rotor pressing plate and the appearance of gaps between the silicon steel sheets caused during the welding operation of the bars to the end ring, thereby ensuring the overall quality of the squirrel-cage rotor; at the same time, this structure is simple, low in cost, and reusable. Description of the Drawings

[0009] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments that conform to the present utility model and are used together with the specification to explain the principles of the present utility model.

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0011] Figure 1 It is a schematic structural diagram of a squirrel-cage motor rotor;

[0012] Figure 2 It is a schematic overall structure diagram of the device described in the present utility model;

[0013] Figure 3 It is a schematic diagram of the use state of the device described in the present utility model.

[0014] In the figure: 1 - sleeve, 2 - bolt, 3 - rotating shaft, 4 - non-driving end rotor pressing plate, 5 - driving end rotor pressing plate, 6 - end ring, 7 - bar, 8 - rotor core, 9 - positioning shoulder. Detailed Embodiments

[0015] In order to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the solution of the present utility model will be further described below. It should be noted that, without conflict, the embodiments of the present utility model and the features in the embodiments may be combined with each other.

[0016] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0017] Many specific details are set forth in the following description in order to provide a thorough understanding of the present utility model, but the present utility model may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0018] The specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0019] As Figure 2 、 3 shown, a welding auxiliary device for a squirrel-cage motor rotor includes a sleeve 1 and a plurality of bolts 2 adapted to the lifting holes on the non-driving end face of the rotating shaft 3. The inner diameter of the sleeve 1 is larger than the inner diameter of the non-driving end rotor pressing plate 4 and smaller than the outer diameter of the non-driving end rotor pressing plate 4. The outer diameter of the sleeve is smaller than the outer diameter of the non-driving end rotor pressing plate 4. The axial distance between the port end face of the sleeve 1 and the inner surface of the barrel bottom is greater than or equal to the axial distance between the non-driving end face of the non-driving end rotor pressing plate 4 and the non-driving end face of the rotating shaft 3. A plurality of pressing holes adapted to the bolts 2 are provided on the barrel bottom of the sleeve 1.

[0020] During use, after the rotating shaft 3, the rotor core 8, and the non-driving end rotor pressing plate 4 are installed, when the rotor bars 7 and the end rings 6 are welded, the outer sleeve 1 of this set should be sleeved on the non-driving end of the rotating shaft 3, and the port of the outer sleeve 1 should be coaxially pressed against the non-driving end rotor pressing plate 4 at the non-driving end. Then, the bolt 2 is passed through the pressing hole and tightened into the hoisting hole on the end face of the non-driving end of the rotating shaft 3, thereby realizing the pressing and positioning of the non-driving end rotor pressing plate 4. When the rotor bars 7 and the end rings 6 are welded, even if the non-driving end rotor pressing plate 4 and the rotor core 8 have a thermal expansion phenomenon, the non-driving end rotor pressing plate 4 will not move due to the positioning effect of this device, thus avoiding the appearance of gaps between the silicon steel sheets and ensuring the overall quality of the squirrel-cage rotor.

[0021] During specific implementation, there are five pressing holes. There are 5 hoisting holes on the end face of the non-driving end of the rotating shaft 3, so 5 pressing holes can be set to ensure the pressing effect of the outer sleeve 1 on the non-driving end rotor pressing plate 4 as much as possible.

[0022] The above are only the specific implementation manners of the present invention, enabling those skilled in the art to understand or implement the present invention. Although the above embodiments have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the foregoing embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A welding auxiliary device for a squirrel-cage motor rotor, characterized in that, It includes a sleeve barrel (1) and a plurality of bolts (2) adapted to the hoisting holes on the non-driving end face of the rotating shaft (3). The inner diameter of the sleeve barrel (1) is larger than the inner diameter of the non-driving end rotor pressing plate (4) and smaller than the outer diameter of the non-driving end rotor pressing plate (4). The outer diameter of the sleeve barrel (1) is smaller than the outer diameter of the non-driving end rotor pressing plate (4). The axial distance between the port end face of the sleeve barrel (1) and the inner surface of the barrel bottom is greater than or equal to the axial distance between the non-driving end face of the non-driving end rotor pressing plate (4) and the non-driving end face of the rotating shaft (3). A plurality of pressing holes adapted to the bolts (2) are provided on the barrel bottom of the sleeve barrel (1).

2. The auxiliary device for welding a squirrel-cage motor rotor according to claim 1, characterized in that, There are five pressing holes.

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