Motor rotor production and assembly device

Abstract

This invention discloses a motor rotor manufacturing and assembly device, including a base with a hollow interior. Clamping components are mounted inside the base and on its upper surface. An L-shaped plate is fixedly mounted on the side of the upper surface of the base, and a hydraulic telescopic rod is fixed to the upper surface of the bent end of the L-shaped plate. A horizontal crossbar is horizontally positioned above the clamping components. This invention employs a distributed lateral force application and an adjustable pressing structure to achieve protective pressing of the rotor. During pressing, the hydraulic telescopic rod drives the crossbar to descend, causing the two pressing components mounted on it to press down synchronously. The pressure plate of the pressing components forms a large-area contact with the outer periphery of the rotor core end face (rather than the central shaft end face), transforming the traditional concentrated point load into a uniform surface load. This effectively avoids the risk of bending, micro-deformation, or loosening of the fit with the core that might result from the pressing force acting directly on the precision central shaft.

Description

Technical Field

[0001] This invention relates to the field of motor rotor assembly technology, and in particular to a motor rotor production and assembly device. Background Technology

[0002] In the manufacturing process of electric motors, the precise and non-destructive pressing and assembly of the rotor into the stator housing is a crucial assembly step that determines the final operating performance of the motor. This step typically involves a precision pressing process with an interference fit, and its assembly quality directly affects the motor's efficiency, noise, vibration, and service life.

[0003] Currently, the commonly used motor rotor press-fitting method and device in the industry has the following main structural principle: First, the stator housing is positioned and clamped using a fixed-size clamp or base. Then, the rotor is placed above the inlet of the stator housing, and a pressure head is driven by a hydraulic or pneumatic cylinder to apply pressure to the rotor in a vertical direction. To transmit pressure, the pressure head is usually designed to act directly on the end face of the rotor's central shaft (rotor shaft), pushing the central shaft to press the entire rotor assembly into the stator cavity.

[0004] Although the above methods are widely used, they have the following drawbacks in terms of the application of pressing force and the adaptability of tooling: The rotor central shaft is the core component connecting the rotor core and bearings and transmitting torque, and its fit with the rotor core is usually very precise. When a huge pressing force is applied directly and concentrated to a point on the end face of the central shaft, the strong axial pressure may indirectly cause squeezing or micro-deformation of the laminations, permanent magnets (for permanent magnet motors), or cast aluminum conductors (for induction motors) inside the rotor core through the central shaft. More seriously, if there is a slight deviation in the alignment between the press head and the shaft, it is very easy to cause additional bending stress on the central bearing, which may lead to micro-bending of the shaft, loosening of the fit, or even damage, creating potential quality problems for the motor. Secondly, the stator clamping tooling of existing devices is usually a rigid design, and its size and position are for a single model of stator housing. When the production line needs to switch to assembling stator housings with different outer diameters or shapes, the operator must stop the machine, disassemble the old tooling, install and recalibrate the new tooling. This process is not only time-consuming and labor-intensive, but also prolongs non-productive time. Therefore, further improvements are needed. To this end, we have proposed a motor rotor production and assembly device. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and to propose a motor rotor production and assembly device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a motor rotor production and assembly device, including a base with a hollow interior, a clamping assembly installed inside the base and on its upper surface, an L-shaped plate fixedly installed on the side of the upper surface of the base, a hydraulic telescopic rod fixedly installed on the upper surface of the bent end of the L-shaped plate, a horizontal crossbar horizontally arranged above the clamping assembly, a pressing assembly slidably connected to both ends of the crossbar, a connecting assembly fixedly installed at the bottom telescopic end of the hydraulic telescopic rod and the middle of the crossbar, and a controller installed on the upper surface of the base.

[0007] Furthermore, the top wall of the base has a strip-shaped opening, and the clamping assembly includes a servo motor fixed to the inner side wall of the base. A bidirectional lead screw is fixed to the output end of the servo motor. Two symmetrical slide rods are threadedly connected to the surface of the bidirectional lead screw. The two slide rods pass through the strip-shaped opening and are slidably connected to the strip-shaped opening. Two symmetrical V-shaped plates are fixed to the top ends of the two slide rods.

[0008] Furthermore, rubber pads are fixed to adjacent side surfaces of both V-shaped plates.

[0009] Furthermore, the connecting assembly includes an end plate fixed to the telescopic end of the hydraulic telescopic rod, with guide rods slidably connected through both sides of the end plate, the bottom end of the guide rods being fixedly connected to the upper surface of the crossbar, and an anti-detachment plate being fixed to the top end of the guide rods.

[0010] Furthermore, a pressure sensor is fixed to the middle of the upper surface of the crossbar, and the pressure sensor is electrically connected to the controller.

[0011] Furthermore, the press-fit assembly includes a sliding sleeve that is slidably fitted onto the surface of the crossbar. A vertical tube is fixed to the lower surface of the sliding sleeve. A vertical rod is slidably connected inside the vertical tube, and a pressure plate is fixed to the bottom end of the vertical rod. A fixing bolt is threaded through the side wall of the bottom end of the vertical tube, and multiple screw holes for screwing in the fixing bolts are equally spaced on the side wall of the vertical rod.

[0012] Furthermore, the top wall of the sliding sleeve is penetrated and connected by a locking bolt via a thread.

[0013] The beneficial effects of this invention are: 1. This invention employs a distributed lateral force application and an adjustable press-fit structure to achieve protective press-fitting of the rotor. During press-fitting, the hydraulic telescopic rod drives the crossbar to descend, causing the two press-fitting components mounted on it to press down synchronously. The pressure plate of the press-fitting component forms a large-area contact with the outer periphery of the rotor core end face (rather than the central shaft end face), transforming the traditional concentrated point load into a uniform surface load, effectively avoiding the risks of bending, micro-deformation, or loosening of the fit with the core that may result from the press-fitting force acting directly on the precision central shaft. Simultaneously, the sliding sleeve of the press-fitting component can slide on the crossbar and be fixed by locking bolts to adjust the distance between the two pressure plates, adapting to rotors of different diameters. The telescopic structure formed by its vertical rod and vertical tube can be locked in different screw hole positions by fixing bolts to adjust the press-fitting depth, adapting to rotors of different heights, thereby significantly improving the adaptability of the device to products of different specifications.

[0014] 2. The clamping assembly of this invention uses a servo motor to drive a bidirectional lead screw to rotate forward and backward, causing two symmetrically arranged sliding rods and V-shaped plates mounted on them to move synchronously towards or away from each other along the strip opening on the base. This structure allows the two V-shaped plates to continuously and precisely adjust their spacing, thereby firmly and centrally clamping stator housings of various diameters within a certain size range. This design eliminates the cumbersome steps of changing special tooling for different stator models, achieving rapid model changeover and flexible production. It ensures stable positioning of the stator during press-fitting, significantly shortens production preparation time, and improves the overall efficiency of the production line. Attached Figure Description

[0015] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is an overall schematic diagram of the present invention; Figure 2 This is a perspective view of the press-fit assembly of the present invention; Figure 3 This is a perspective view of the V-shaped plate of the present invention; Figure 4 For the present invention Figure 1 Enlarged view of point A in the middle.

[0017] The attached figures are labeled as follows: 1. Base; 101. Strip-shaped opening; 2. Clamping assembly; 21. Servo motor; 22. Two-way lead screw; 23. Slide rod; 24. V-shaped plate; 3. L-shaped plate; 4. Hydraulic telescopic rod; 5. Crossbar; 6. Pressing assembly; 61. Sliding sleeve; 62. Locking bolt; 63. Vertical tube; 64. Vertical rod; 65. Pressure plate; 66. Fixing bolt; 67. Screw hole; 7. Connecting assembly; 71. End plate; 72. Guide rod; 73. Anti-detachment plate; 8. Pressure sensor. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1-4 As shown, a motor rotor production and assembly device is disclosed, including a base 1 with a hollow interior. A clamping assembly 2 is installed inside the base 1 and on its upper surface. An L-shaped plate 3 is fixedly installed on the side of the upper surface of the base 1. A hydraulic telescopic rod 4 is fixedly installed on the upper surface of the bent end of the L-shaped plate 3. A horizontal bar 5 is horizontally arranged above the clamping assembly 2. Press-fitting assemblies 6 are slidably connected to both ends of the horizontal bar 5. A connecting assembly 7 is fixedly installed at the bottom telescopic end of the hydraulic telescopic rod 4 and the middle of the horizontal bar 5. A controller is installed on the upper surface of the base 1.

[0020] The controller adopts the Siemens SIMATIC KP1200 controller with screen (HMI+PLC integrated machine). The controller can control the operation of various electrical components of the device. The electrical connection and control method between the controller and various electrical components are existing technologies and will not be described in detail here.

[0021] The top wall of the base 1 has a strip-shaped opening 101. The clamping assembly 2 includes a servo motor 21 fixed to the inner side wall of the base 1. A bidirectional lead screw 22 is fixed to the output end of the servo motor 21. Two symmetrical slide rods 23 are threadedly connected to the surface of the bidirectional lead screw 22. The two slide rods 23 pass through the strip-shaped opening 101 and are slidably connected to the strip-shaped opening 101. Two symmetrical V-shaped plates 24 are fixed to the top of the two slide rods 23.

[0022] When fixing the stator housing of the motor, place the stator housing on the surface of the base 1 and between the two V-shaped plates 24. Then start the servo motor 21 to drive the bidirectional lead screw 22 to rotate. The bidirectional lead screw 22 will drive the two slide rods 23 to move closer to each other along the strip opening 101, thereby driving the two V-shaped plates 24 to move closer to each other. The two V-shaped plates 24 are used to press and fix the circular stator housing.

[0023] Rubber pads are fixed to the adjacent side surfaces of the two V-shaped plates 24. When the stator housing is clamped and fixed by the V-shaped plates 24, the rubber pads are squeezed and deformed, which increases the friction between the V-shaped plates 24 and the stator housing, thereby increasing stability.

[0024] The connecting assembly 7 includes an end plate 71 fixed to the telescopic end of the hydraulic telescopic rod 4. Guide rods 72 are slidably connected through both sides of the end plate 71. The bottom end of the guide rod 72 is fixedly connected to the upper surface of the crossbar 5. An anti-detachment plate 73 is fixed to the top end of the guide rod 72.

[0025] With the guide rod 72 connected, the hydraulic telescopic rod 4 can extend and retract to drive the crossbar 5 to move up and down. When the crossbar 5 descends, it drives the pressing assembly 6 to squeeze the rotor.

[0026] A pressure sensor 8 is fixed in the middle of the upper surface of the crossbar 5, and the pressure sensor 8 is electrically connected to the controller. When the crossbar 5 descends and drives the pressing assembly 6 to press the rotor, the pressure sensor 8 monitors the pressing force of the end plate 71 on the crossbar 5 in real time. This pressing force is the pressure on the rotor. When the pressure reaches the preset value of the controller, the controller controls the hydraulic telescopic rod 4 to shorten and reset, thereby completing the pressing operation.

[0027] The press-fit assembly 6 includes a sliding sleeve 61 that is slidably fitted onto the surface of the crossbar 5. A vertical tube 63 is fixed to the lower surface of the sliding sleeve 61. A vertical rod 64 is slidably connected inside the vertical tube 63. A pressure plate 65 is fixed to the bottom end of the vertical rod 64. A fixing bolt 66 is threaded through the side wall of the bottom end of the vertical tube 63. Multiple screw holes 67 for screwing in the fixing bolt 66 are equally spaced on the side wall of the vertical rod 64.

[0028] When the crossbar 5 drives the pressing assembly 6 to descend and press the rotor, the outer circumference of the rotor core end face is pressed by the arc-shaped pressure plate 65 to avoid pressing the shaft. Before pressing, the fixing bolt 66 can be unscrewed from the currently connected screw hole 67. Then, slide the vertical bar 64 along the vertical tube 63 to adjust the initial height of the pressure plate 65. After adjustment, the fixing bolt 66 can be screwed into the corresponding screw hole 67 to press rotors of different heights.

[0029] The top wall of the sliding sleeve 61 is penetrated and connected by a locking bolt 62 via a thread. By sliding the sliding sleeve 61 laterally along the crossbar 5, the distance between the two pressure plates 65 can be adjusted. Then, tightening the locking bolt 62 presses against the surface of the crossbar 5 to fix the sliding sleeve 61, thereby enabling the pressing of rotors of different diameters.

[0030] Working principle: First, the operator places the stator housing to be assembled on the upper surface of the base 1, positioning it between the two V-shaped plates 24. The controller is activated, controlling the servo motor 21 to run. The servo motor 21 drives the bidirectional lead screw 22 to rotate. The bidirectional lead screw 22 drives the two slide rods 23 to slide synchronously towards each other along the strip opening 101 on the base 1, thereby driving the two V-shaped plates 24 to move closer to each other until the rubber pads on their surfaces tightly clamp and fix the stator housing.

[0031] Next, the operator adjusts the dimensions of the rotor to be pressed: the sliding sleeves 61 of the two pressing components 6 are moved laterally along the crossbar 5, the distance between the two pressure plates 65 is adjusted to fit the rotor diameter, and then the locking bolts 62 on the sliding sleeves 61 are tightened to fix them; at the same time, according to the rotor height, the fixing bolts 66 on the vertical tube 63 are loosened, and the vertical rod 64 is slid up and down to adjust the initial height of the pressure plate 65. After adjustment, the fixing bolts 66 are tightened to make them pass into the corresponding screw holes 67 of the vertical rod 64 and lock them.

[0032] After preparation, align the rotor with the stator housing assembly position. The controller activates the hydraulic telescopic rod 4, whose telescopic end extends downwards, driving the crossbar 5 to descend smoothly via the connecting assembly 7. The end plate 71 of the connecting assembly 7 is fixed to the hydraulic telescopic rod 4 and connected to the crossbar 5 via two guide rods 72, ensuring the vertical movement of the crossbar 5. As the crossbar 5 descends, it drives the two pre-adjusted pressing assemblies 6 to press down synchronously. The arc-shaped pressure plate 65 of the pressing assembly 6 contacts the outer circumferential area of ​​the rotor core end face and applies pressure, pushing the rotor smoothly into the fixed stator housing. During this process, the pressure sensor 8 fixed to the upper surface of the crossbar 5 monitors and feeds back the pressure value (i.e., the actual pressing force) applied to the crossbar 5 by the end plate 71 to the controller in real time. When the controller determines that the feedback value of the pressure sensor 8 has reached the preset safe pressure threshold for completing the assembly, it immediately controls the hydraulic telescopic rod 4 to stop extending and retract to reset, thereby driving the crossbar 5 and the pressing assembly 6 to rise, detaching from the pressed rotor, and the entire assembly process ends.

[0033] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A motor rotor production and assembly device, comprising a base (1), wherein the base (1) has a hollow interior, characterized in that: The base (1) is equipped with a clamping assembly (2) inside and on its upper surface. An L-shaped plate (3) is fixedly installed on the side of the upper surface of the base (1). A hydraulic telescopic rod (4) is fixed on the upper surface of the top bent end of the L-shaped plate (3). A horizontal bar (5) is horizontally arranged above the clamping assembly (2). A press-fitting assembly (6) is slidably connected to both ends of the horizontal bar (5). A connecting assembly (7) is fixed together with the bottom telescopic end of the hydraulic telescopic rod (4) and the middle part of the horizontal bar (5). A controller is installed on the upper surface of the base (1).

2. The motor rotor production and assembly device according to claim 1, characterized in that: The base (1) has a slotted opening (101) on its top wall. The clamping assembly (2) includes a servo motor (21) fixed to the inner side wall of the base (1). The output end of the servo motor (21) is fixed with a bidirectional lead screw (22). The surface of the bidirectional lead screw (22) is threaded with two symmetrical slide rods (23). The two slide rods (23) pass through the slotted opening (101) and are slidably connected to the slotted opening (101). The top ends of the two slide rods (23) are fixed with two symmetrical V-shaped plates (24).

3. The motor rotor production and assembly device according to claim 2, characterized in that: Rubber pads are fixed to the adjacent side surfaces of the two V-shaped plates (24).

4. The motor rotor production and assembly device according to claim 1, characterized in that: The connecting assembly (7) includes an end plate (71) fixed to the telescopic end of the hydraulic telescopic rod (4). Guide rods (72) are slidably connected through both sides of the end plate (71). The bottom end of the guide rod (72) is fixedly connected to the upper surface of the crossbar (5). An anti-detachment plate (73) is fixed to the top end of the guide rod (72).

5. The motor rotor production and assembly device according to claim 4, characterized in that: A pressure sensor (8) is fixed in the middle of the upper surface of the crossbar (5), and the pressure sensor (8) is electrically connected to the controller.

6. The motor rotor production and assembly device according to claim 1, characterized in that: The press-fit assembly (6) includes a sliding sleeve (61) that is slidably fitted onto the surface of the crossbar (5). A vertical tube (63) is fixed on the lower surface of the sliding sleeve (61). A vertical rod (64) is slidably connected inside the vertical tube (63). A pressure plate (65) is fixed at the bottom end of the vertical rod (64). A fixing bolt (66) is threaded through the side wall of the bottom end of the vertical tube (63). A plurality of screw holes (67) for screwing in the fixing bolt (66) are equally spaced on the side wall of the vertical rod (64).

7. The motor rotor production and assembly device according to claim 6, characterized in that: The top wall of the sliding sleeve (61) is penetrated and connected by a locking bolt (62) via a thread.

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