Motor rotor shrinkage fit equipment

Abstract

The utility model discloses a motor rotor shrink fit device, which belongs to the technical field of motor manufacture, and comprises a mounting rack, a heater, a rotor core and a rotating shaft, the mounting rack is fixedly connected with a support frame, the support frame and the mounting rack are both fixedly connected with an electric telescopic rod, the heater is fixedly connected with the output end of the electric telescopic rod, and the rotor core is fixedly connected with the rotating shaft. The output ends of the mounting frame and the electric telescopic rod are fixedly connected with mounting plates; through cooperative use of the devices, the rotor iron core and the rotating shaft are positioned, the driving mechanism drives the plurality of positioning balls to get close to each other, the rotor iron cores of different sizes are positioned in the dead centers of the mounting plates, and meanwhile, the driving mechanism arranged on the other mounting plate drives the clamping plates to get close to each other. The rotating shafts of different sizes can be clamped and fixed in the center of the mounting plate, and the rotating shafts and the rotor iron core are positioned in the center of the mounting plate, so that the axes of the rotating shafts and the rotor iron core are opposite, and the rotating shafts and the rotor iron core are convenient to assemble.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing technology, specifically a motor rotor heat-shrinking device. Background Technology

[0002] In the manufacturing process of electric motors, from parts to complete machines, multiple assembly processes are involved. Some processes have significant limitations, while others offer some flexibility, such as the assembly of bearings and shafts, the assembly of stator cores and frames, and the assembly of rotor cores and shafts.

[0003] Cold pressing involves using necessary tooling to ensure that the related components have sufficiently good theoretical fit dimensions, and then using external force to complete the assembly relationship. This assembly method, especially for interference fit components, can cause some damage to the mating surfaces, particularly if the components were not theoretically aligned before assembly. Forcing them together will result in more severe damage, potentially leading to a decline in motor performance later on. Due to the limitations of the tooling and equipment required for cold pressing, hot fitting is more commonly chosen. This eliminates the need for tooling investment and increases assembly flexibility. As long as temperature and key quality control points are managed, assembly can be completed relatively easily. Examples include hot fitting of large motor bearings after heating with a bearing heater, hot fitting of the motor frame and stator core after heating, and hot fitting of cast aluminum rotors and shafts. Temperature control is particularly crucial in hot fitting. Excessive temperature must be avoided to prevent performance degradation, and the optimal timing for proper fit must be controlled to prevent axial displacement due to loosening.

[0004] Upon investigation, a Chinese utility model patent discloses a motor rotor heat-shrinking device and equipment (publication number: CN212726791U), which includes a positioning fixture, a heating mechanism, and a pressure plate. The positioning fixture has a base and a positioning rod disposed on the base. The metal plate passes through the positioning rod and is disposed on the base. The rotor core passes through the positioning rod and is disposed on the metal plate. The heating mechanism has an induction heater.

[0005] Although the aforementioned patent significantly shortens both heating and cooling times through the heating mechanism, and correspondingly reduces the time for rotor heat fitting, thus improving work efficiency, it requires positioning the shaft and rotor core before assembling them so that the shaft is directly above the rotor core. This device positions the rotor core using a positioning rod, which can only position rotor cores of the same size. Furthermore, this device lacks positioning for the shaft, affecting assembly accuracy.

[0006] Therefore, this utility model provides a motor rotor heat-shrinking device to solve the above problems. Utility Model Content

[0007] (a) Technical problems to be solved

[0008] This utility model provides a motor rotor heat-shrinking device, which aims to solve the problems mentioned in the background art.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, this utility model provides the following technical solution: It includes a mounting frame, a heater, a rotor core, and a rotating shaft. A support frame is fixedly connected to the mounting frame. An electric telescopic rod is fixedly connected to both the support frame and the mounting frame. The heater is fixedly connected to the output end of the electric telescopic rod. Mounting plates are fixedly connected to the output ends of both the mounting frame and the electric telescopic rod. Multiple clamping plates for holding the rotating shaft and positioning balls for positioning the rotor core are respectively provided on the two mounting plates. Each mounting plate contains a driving mechanism for moving the clamping plates and positioning balls. The driving mechanism includes multiple moving blocks.

[0011] As a preferred technical solution of this application, the mounting plate has a cavity, the multiple moving blocks are slidably connected in the cavity, the side walls of the multiple clamping plates are fixedly connected to connecting plates, and the multiple positioning balls are fixedly connected to connecting rods.

[0012] As a preferred technical solution of this application, the driving mechanism further includes a circular plate, which is rotatably connected in the cavity. The upper surface of the circular plate is provided with a spiral groove, and the plurality of moving blocks are movably connected in the spiral groove.

[0013] As a preferred technical solution of this application, a toothed ring is fixedly connected to the lower surface of the circular plate, and a gear is rotatably connected inside the cavity, with the gear meshing with the toothed ring.

[0014] As a preferred technical solution of this application, a motor is fixedly connected to the side wall of the mounting plate, and the output end of the motor is coaxially fixed with the gear.

[0015] As a preferred technical solution of this application, the multiple connecting plates and connecting rods slide through the side wall of the mounting plate and extend into the cavity to be fixedly connected to the multiple moving blocks.

[0016] (III) Beneficial Effects

[0017] By setting positioning balls and clamping plates to position the rotor core and shaft respectively, the drive mechanism drives multiple positioning balls to move closer to each other, positioning rotor cores of different sizes at the center of the mounting plate. At the same time, the drive mechanism set on another mounting plate drives the clamping plates to move closer to each other, clamping and fixing shafts of different sizes at the center of the mounting plate. With both the shaft and rotor core positioned at the center of the mounting plate, the axes of the shaft and rotor core are aligned, facilitating the assembly of the shaft and rotor core. Attached Figure Description

[0018] Figure 1 A schematic diagram of a motor rotor heat-shrinking device;

[0019] Figure 2 This is a cross-sectional view of the mounting plate in a motor rotor heat-shrinking device;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0022] Figure 5 for Figure 2 Enlarged view of point C in the middle.

[0023] In the picture:

[0024] 1. Mounting bracket; 2. Support frame; 3. Heater; 4. Rotor core; 5. Shaft; 6. Electric telescopic rod; 7. Mounting plate; 8. Motor; 9. Circular plate; 10. Spiral groove; 11. Gear ring; 12. Gear; 13. Connecting plate; 14. Clamping plate; 15. Moving block; 16. Connecting rod; 17. Positioning ball. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This utility model provides a motor rotor heat-shrinking device, such as... Figures 1-5As shown, the technical solution includes a mounting frame 1, a heater 3, a rotor core 4, and a rotating shaft 5. A support frame 2 is fixedly connected to the mounting frame 1. An electric telescopic rod 6 is fixedly connected to both the support frame 2 and the mounting frame 1. The heater 3 is fixedly connected to the output end of the electric telescopic rod 6. Mounting plates 7 are fixedly connected to the output ends of both the mounting frame 1 and the electric telescopic rod 6. It should be noted that the electric telescopic rod 6 drives the heater 3 to extend into the rotor core 4 to heat the rotor core 4. After heating, another electric telescopic rod 6 is activated to drive the rotating shaft 5, which is clamped and positioned, to be inserted into the rotor core 4 to achieve assembly. The two mounting plates 7 are respectively provided with multiple clamping plates 14 for clamping the rotating shaft 5 and positioning balls 17 for positioning the rotor core 4. Each mounting plate 7 is provided with a drive mechanism for driving the clamping plates 14 and positioning balls 17 to move. The drive mechanism includes multiple moving blocks 15.

[0027] The mounting plate 7 has a cavity, and multiple moving blocks 15 are slidably connected in the cavity. Connecting plates 13 are fixedly connected to the side walls of multiple clamping plates 14, and connecting rods 16 are fixedly connected to multiple positioning balls 17. Multiple connecting plates 13 and connecting rods 16 slide through the side walls of the mounting plate 7 and extend into the cavity to be fixedly connected to multiple moving blocks 15. The drive mechanism drives multiple positioning balls 17 to move closer to each other, which can position rotor cores 4 of different sizes at the center of the mounting plate 7. At the same time, the drive mechanism set on another mounting plate 7 drives clamping plates 14 to move closer to each other, which can clamp and fix rotating shafts 5 of different sizes at the center of the mounting plate 7. The rotating shafts 5 and rotor cores 4 are both positioned at the center of the mounting plate 7, so that the axes of the rotating shafts 5 and rotor cores 4 are opposite each other, which facilitates the assembly of rotating shafts 5 and rotor cores 4.

[0028] The drive mechanism also includes a circular plate 9, which is rotatably connected in the cavity. The upper surface of the circular plate 9 is provided with a spiral groove 10, and multiple moving blocks 15 are movably connected in the spiral groove 10. A gear ring 11 is fixedly connected to the lower surface of the circular plate 9, and a gear 12 is rotatably connected in the cavity, and the gear 12 meshes with the gear ring 11. A motor 8 is fixedly connected to the side wall of the mounting plate 7, and the output end of the motor 8 is coaxially fixed with the gear 12. When in use, starting the motor 8 drives the multiple moving blocks 15 in the drive mechanism to move synchronously. The multiple moving blocks 15 drive the clamping plate 14 and the positioning ball 17 to move synchronously through the connecting plate 13 and the connecting rod 16, respectively. The multiple clamping plates 14 move closer to each other to clamp and position the rotating shaft 5 at the center position of the mounting plate 7, and the multiple positioning balls 17 move closer to each other to position the rotor core 4 at the center position of another mounting plate 7, so that the axes of the rotating shaft 5 and the rotor core 4 are opposite each other.

[0029] It should be noted that the motor 8 is connected to an external power source via wires. The external power source includes a battery for providing power to the motor 8 and a control switch for controlling its start and stop. The external power source is existing technology. The specific model and specifications of the motor 8 need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts existing technology in this field, so it will not be described in detail.

[0030] In summary: During operation, the starting motor 8 drives the gear 12 to rotate. The rotating gear 12 drives the circular plate 9 to rotate through the meshing gear ring 11. The rotating circular plate 9 drives multiple moving blocks 15 to move synchronously through the spiral groove 10. The multiple moving blocks 15 drive the clamping plate 14 and the positioning ball 17 to move synchronously through the connecting plate 13 and the connecting rod 16, respectively. The multiple clamping plates 14 move closer together to clamp and position the rotating shaft 5 at the center of the mounting plate 7. The multiple positioning balls 17 move closer together to position the rotor core 4 at the center of another mounting plate 7, so that the axes of the rotating shaft 5 and the rotor core 4 are aligned, which facilitates the assembly of the rotating shaft 5 and the rotor core 4.

[0031] 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 the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A motor rotor heat-shrinking device, comprising a mounting frame (1), a heater (3), a rotor core (4), and a rotating shaft (5), characterized in that: A support frame (2) is fixedly connected to the mounting frame (1). An electric telescopic rod (6) is fixedly connected to both the support frame (2) and the mounting frame (1). The heater (3) is fixedly connected to the output end of the electric telescopic rod (6). Mounting plates (7) are fixedly connected to the output ends of both the mounting frame (1) and the electric telescopic rod (6). Each of the two mounting plates (7) is provided with a plurality of clamping plates (14) for clamping the rotating shaft (5) and positioning balls (17) for positioning the rotor core (4). Each mounting plate (7) is provided with a driving mechanism for driving the clamping plates (14) and positioning balls (17) to move. The driving mechanism includes a plurality of moving blocks (15).

2. The motor rotor heat-shrinking device according to claim 1, characterized in that: The mounting plate (7) has a cavity, and multiple moving blocks (15) are slidably connected in the cavity. A connecting plate (13) is fixedly connected to the side wall of multiple clamping plates (14), and a connecting rod (16) is fixedly connected to multiple positioning balls (17).

3. The motor rotor heat-shrinking device according to claim 1, characterized in that: The driving mechanism also includes a circular plate (9), which is rotatably connected in the cavity. The upper surface of the circular plate (9) is provided with a spiral groove (10), and multiple moving blocks (15) are movably connected in the spiral groove (10).

4. The motor rotor heat-shrinking device according to claim 3, characterized in that: A toothed ring (11) is fixedly connected to the lower surface of the circular plate (9), and a gear (12) is rotatably connected inside the cavity, and the gear (12) meshes with the toothed ring (11).

5. The motor rotor heat-shrinking device according to claim 4, characterized in that: A motor (8) is fixedly connected to the side wall of the mounting plate (7), and the output end of the motor (8) is fixed coaxially with the gear (12).

6. The motor rotor heat-shrinking device according to claim 2, characterized in that: Multiple connecting plates (13) and connecting rods (16) slide through the side wall of the mounting plate (7) and extend into the cavity to be fixedly connected to multiple moving blocks (15).

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