Dummy shaft for casting motor rotor

Abstract

The utility model relates to a dummy shaft for casting a motor rotor, which comprises a body, the body is provided with a head part and a tail part, the head part of the body is connected with a knocking head, the knocking head is knocked to indirectly act on the body, and the knocking head is provided with a radially through lifting hole. Through the arrangement of the knocking head, a worker does not need to directly knock the body, but indirectly acts on the body through the knocking head, so that direct contact between the knocking piece and the body can be avoided, deformation of the body is avoided, and a lifting rope can pass through the lifting hole to lift the whole body; and meanwhile, the body and the knocking head are coaxially arranged, so that the uniformity of physical force transmission to the body when the knocking head is knocked is facilitated, and local deformation of the body caused by eccentricity of the knocking head is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of rotor casting technology, and specifically relates to a dummy shaft for casting motor rotors. Background Technology

[0002] The rotor of the three-phase asynchronous motor is a squirrel-cage cast aluminum rotor. The necessary tooling in the production of cast aluminum rotors is the intermediate mold, dummy shaft, and pin. When casting the rotor, the dummy shaft and pin are first installed, then the rotor laminations are fitted, and then the intermediate mold and upper and lower molds are installed to complete the casting. After the aluminum is cast, the dummy shaft and pin fit tightly with the rotor shaft hole. Generally, the dummy shaft head needs to be manually tapped to remove the dummy shaft and pin. Over time, a large number of dummy shaft heads are deformed and flaked. The deformation and flaking of the keyway at the head cause unevenness and protrusions when the dummy shaft pin is installed in the keyway. This causes interference at the shaft hole when a new rotor lamination is fitted in. It is difficult to fit in without filing and grinding, which causes great trouble to the production. In addition, when using lifting rings to lift the rotor, the lifting rings are time-consuming to disassemble and assemble. However, if the lifting rings are not disassembled and assembled, they are easily deformed and damaged by the impact. This problem has been troubling the rotor casting process. Utility Model Content

[0003] This utility model addresses the problems of the prior art by providing a dummy shaft for casting motor rotors. The specific technical solution is as follows:

[0004] A dummy shaft for casting motor rotor includes a body, which has a head and a tail. A striking head is connected to the head of the body. The striking head is struck to indirectly act on the body. A radially penetrating lifting hole is provided on the striking head.

[0005] As a further technical solution of this utility model, the body and the striking head are coaxially arranged.

[0006] As a further technical solution of this utility model, the main body and the striking head are detachably connected. The head of the main body is provided with a mounting port corresponding to the striking head. The insertion end of the striking head has a radially protruding insert. The side wall of the mounting port is radially recessed with a channel for inserting the striking head. The inner side of the mounting port is radially provided with an arc-shaped part coaxial with the mounting port. The arc-shaped part communicates with the channel.

[0007] In the installed state, the insert is screwed into the arc-shaped part, and the passage and the insert are staggered on the projection plane of the plumb bob to limit the relative axial displacement of the body and the striking head, and the lifting hole is in a horizontal state.

[0008] As a further technical solution of this utility model, the end of the arc-shaped part away from the passageway has a limit position;

[0009] In the installed state, the insert is screwed into the arc-shaped part and placed in the extreme position, and the lifting hole is in a horizontal state.

[0010] As a further technical solution of this utility model, the tail of the body has a radially extending flange to restrict the rotor laminations from falling off.

[0011] As a further technical solution of this utility model, a keyway is provided on the curved surface of the body, the keyway is parallel to the axis of the body, and the keyway extends to the head and / or tail of the body to form an opening.

[0012] The beneficial effects of this utility model are as follows:

[0013] (1) In this application, by setting the hammer head, the worker does not need to directly hammer the body, but can indirectly act on the body by using the hammer head. In this way, the hammering part and the body can be kept in direct contact, thus avoiding deformation of the body. In addition, the setting of the lifting hole can also allow the lifting rope to pass through, so as to lift the body as a whole. At the same time, the body and the hammer head are set coaxially, which is conducive to the uniformity of the force transmission from the hammer head to the body when it is hammered, and avoids the local deformation of the body caused by the eccentricity of the hammer head.

[0014] (2) In this application, by setting the passage, the arc part and the insert, the lifting hole is in a horizontal state after the body and the hammer head are installed, the insert and the passage are misaligned, and the body and the hammer head are not allowed to move axially relative to each other, thereby preventing the body and the hammer head from separating. Therefore, the way in which the body and the hammer head are easy to disassemble also facilitates the replacement of the hammer head. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall structure of the dummy shaft for casting motor rotor is shown;

[0016] Figure 2 A schematic diagram showing the disassembled structure of the body and the striking head is provided.

[0017] Figure 3 A schematic diagram of the assembly process of the body and the striking head is shown;

[0018] Figure 4 A schematic diagram of the assembled body and striking head is shown.

[0019] Legend:

[0020] 100, Body; 110, Flange; 120, Keyway; 130, Mounting Port; 140, Channel; 150, Arc-shaped Part; 160, Limit Position; 200, Striking Head; 210, Lifting Hole; 220, Insert Block. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0022] Figure 1 A schematic diagram of the overall structure of the dummy shaft for casting motor rotor is shown; Figure 1 In this embodiment, a dummy shaft for casting a motor rotor includes a body 100, which has a head and a tail. The tail of the body 100 has a radially extending flange 110. The rotor laminations are fitted onto the body 100 from the head, and the radially extending flange 110 at the tail restricts the rotor laminations from falling off from the other end. A keyway 120 is formed on the curved surface of the body 100, parallel to the axis of the body 100. The keyway 120 extends towards the head and / or tail of the body 100 to form an opening, facilitating the insertion and removal of the dummy shaft pin. The keyway 120 passes through and interferes with the flange 110. It should be noted that although this embodiment shows a keyway 120 with openings at both ends, as... Figure 1 As shown, but this is not a limitation. In some other embodiments, the keyway 120 may extend only to the head of the body 100 or only to the tail of the body 100, forming an opening only at one end of the body 100. This is sufficient to allow the dummy pin to be inserted or removed. A striking head 200 is connected to the head of the body 100. The worker strikes the striking head 200 to indirectly act on the body 100. The striking head 200 has a radially penetrating lifting hole 210. Through the setting of the striking head 200, the worker can... Instead of directly striking the body 100, the striking head 200 is used to indirectly act on the body 100. This avoids direct contact between the striking part and the body 100, preventing deformation of the body 100. Furthermore, the lifting hole 210 allows the lifting rope to pass through, enabling the body 100 to be lifted as a whole. The body 100 and the striking head 200 are coaxially arranged, which helps to ensure the uniformity of force transmission from the striking head 200 to the body 100 when struck, and prevents local deformation of the body 100 caused by the eccentricity of the striking head 200.

[0023] Figure 2 A schematic diagram of the disassembled structure of the body 100 and the striking head 200 is shown; Figure 3 A schematic diagram of the assembly process of the body 100 and the striking head 200 is shown; Figure 4 A schematic diagram of the assembled structure of the body 100 and the striking head 200 is shown; Figure 3 Through Figure 2 The striking head 200 is brought closer to the body 100. Figure 4 yes Figure 3It is obtained by the relative rotation of the main body 100 and the striking head 200; Figure 2 and Figure 4 In this embodiment, the main body 100 and the striking head 200 are detachably connected. The head of the main body 100 has a mounting opening 130 corresponding to the striking head 200. The insertion end of the striking head 200 has a radially protruding insert 220. A radially recessed channel 140 for inserting the striking head 200 is formed on the side wall of the mounting opening 130. An arc-shaped portion 150 coaxial with the mounting opening 130 is formed radially on the inner side of the mounting opening 130, and the arc-shaped portion 150 is aligned with the striking head 200. The passageway 140 is connected, and the arc-shaped portion 150 has a limit position 160 at the end away from the passageway 140. During assembly and disassembly, the radial dimension of the striking head 200 matches the mounting opening 130 on the head of the body 100, ensuring that the striking head 200 and the body 100 do not move radially relative to each other after installation, and also facilitating the smooth docking of the striking head 200 with the body 100. The insert block 220 and the passageway 140 are a mutually cooperating structure. The setting of 140 restricts the insertion angle of the striking head 200. That is, the insert block 220 and the channel 140 must be aligned before the striking head 200 can be inserted into the mounting port 130. After insertion, the striking head 200 only needs to be rotated to one side of the arc-shaped part 150 to rotate the insert block 220 into the arc-shaped part 150. In this way, on the projection plane of the plumb bob, the insert block 220 and the channel 140 are misaligned, and the body 100 and the striking head 200 are not allowed to have axial displacement relative to each other. The setting of the limit position 160 is the farthest position from the channel 140, which can ensure that the body 100 and the striking head 200 do not have relative displacement in the axial direction to the greatest extent. It should also be noted that in the installed state, that is, after the insert block 220 is rotated to a certain position, the lifting hole 210 is in a horizontal state. This is because when the lifting rope is used to horizontally lift the device through the lifting hole 210, the lifting hole 210 is always in a horizontal state.

[0024] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A dummy shaft for casting an electric motor rotor, comprising a body (100), characterized in that: The body (100) has a head and a tail. The head of the body (100) is connected to a striking head (200). The striking head (200) is struck to indirectly act on the body (100). The striking head (200) has a radially penetrating lifting hole (210).

2. The dummy shaft for casting motor rotor according to claim 1, characterized in that: The body (100) and the striking head (200) are coaxially arranged.

3. The dummy shaft for casting motor rotor according to claim 2, characterized in that: The main body (100) and the striking head (200) are detachably connected. The head of the main body (100) is provided with a mounting port (130) corresponding to the striking head (200). The insertion end of the striking head (200) has a radially protruding insert (220). The side wall of the mounting port (130) is radially recessed with a channel (140) for the striking head (200) to be inserted. The inner side of the mounting port (130) is provided with an arc-shaped part (150) coaxial with the mounting port (130). The arc-shaped part (150) communicates with the channel (140). In the installed state, the insert (220) is screwed into the arc-shaped part (150), and the passage (140) and the insert (220) are staggered on the projection plane of the plumb bob to limit the relative displacement of the body (100) and the striking head (200) in the axial direction, and the lifting hole (210) is in a horizontal state.

4. The dummy shaft for casting motor rotor according to claim 3, characterized in that: The arc-shaped portion (150) has a limit position (160) at the end away from the passageway (140); In the installed state, the insert (220) is screwed into the arc-shaped part (150) and placed in the limit position (160), and the lifting hole (210) is in a horizontal state.

5. The dummy shaft for casting motor rotor according to claim 3, characterized in that: The tail of the body (100) has a radially extending flange (110) to restrict rotor laminations from falling off.

6. The dummy shaft for casting motor rotor according to claim 3, characterized in that: A keyway (120) is provided on the curved surface of the body (100). The keyway (120) is parallel to the axis of the body (100) and extends to the head and / or tail of the body (100) to form an opening.

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