A casing hot sleeve press fitting machine

Abstract

The application discloses a casing hot sleeve press-fitting machine, which comprises a limiting assembly for positioning a casing and a stator; a sliding assembly connected with the limiting assembly and used for driving the limiting assembly to move; a hot air blowing assembly used for uniformly heating the casing, wherein the air outlet direction of the hot air blowing assembly is configured to be capable of blowing the casing from at least two different directions; and an assembling assembly used for press-fitting the stator into the casing. The application has the effect of optimizing the problems of uneven heating, low efficiency and difficulty in integration of automation existing in the existing heating mode.

Description

Technical Field

[0001] This application relates to the field of housing heat fitting technology, and in particular to a housing heat fitting machine. Background Technology

[0002] In the field of motor manufacturing, the precision pressing of the stator into the housing is a core process for ensuring motor performance and reliability. To achieve good heat conduction and structural stability, the stator and housing are typically fitted with an interference fit. Direct cold pressing would require enormous pressing force and could easily damage the stator's silicon steel sheets or deform the housing, severely impacting product quality. Therefore, the industry commonly employs heat-shrink fitting technology, which involves heating the housing to expand its inner bore, thereby reducing or eliminating the interference fit with the stator, allowing for pressing under less pressure.

[0003] Existing commonly used heating methods all have significant drawbacks: Oven heating can heat the casing evenly, but it has a slow production cycle, high energy consumption, and is difficult to integrate into automated production lines; Hot air gun heating is usually single-point and unidirectional heating, with a concentrated hot air flow field, which can easily generate large temperature gradients in the circumferential and axial directions of the casing, resulting in uneven heating. This can lead to stator tilting or jamming during pressing, or loosening of the fit and out-of-tolerance roundness of the casing due to residual stress after cooling; In addition, although magnetic induction heating is fast, the uneven distribution of magnetic lines of force and the skin effect can cause uneven heating in the circumferential and depth directions of the casing, which also affects the pressing accuracy and final quality.

[0004] In summary, the existing technology lacks a solution that can be efficiently integrated into an automated press-fitting production line and can rapidly and uniformly heat the housing. This bottleneck severely restricts the further improvement of motor assembly quality and efficiency. Utility Model Content

[0005] This application proposes a casing heat fitting press machine, which aims to optimize the problems of uneven heating, low efficiency and difficulty in integration and automation of existing heating methods.

[0006] Specifically, the housing heat fitting press-fitting machine includes a limiting component, a sliding component, a hot air blowing component, and an assembly component. The hot air blowing component is creatively configured to simultaneously blow air onto the housing from at least two different directions. This allows the housing to be heated quickly and evenly in both the circumferential and axial directions, effectively eliminating localized overheating or underheating. Thus, while achieving efficient and automated press-fitting, it fundamentally ensures the precision of the press-fitting fit between the stator and the housing, as well as product quality, avoiding defects such as stator jamming, housing deformation, and loose fit caused by uneven heating.

[0007] The technical solution for a housing heat fitting press-fitting machine provided in this application is as follows: A housing heat fitting press machine, comprising: Limiting components are used to position the housing and stator; A sliding component, connected to the limiting component, is used to drive the limiting component to move; A hot air blowing assembly is used to uniformly heat the casing, and the air outlet direction of the hot air blowing assembly is configured to blow on the casing from at least two different directions. Assembly components are used to press the stator into the housing.

[0008] By adopting the above technical solution, the limiting component is installed on the sliding component, and the hot air blowing component and the assembly component are installed opposite each other around the sliding path of the limiting component, thereby realizing automated heating of the housing and precision pressing of the stator. Specifically, the sliding component drives the limiting component and the workpiece on it to the hot air blowing station. The hot air blowing component blows and heats the housing from at least two different directions. Then, the assembly component performs the pressing operation to install the stator into the housing. This design allows the housing to be heated quickly and evenly, thereby effectively eliminating the temperature gradient problem caused by unidirectional heating. Its advantages are that it not only significantly improves the accuracy and quality of pressing fit and avoids stator jamming and housing deformation, but also the whole process is compact and efficient, perfectly adapted to automated production lines, and greatly improves production efficiency.

[0009] Preferably, the hot air blowing assembly includes a first hot air blowing element and a second hot air blowing element, wherein the air outlet direction of the first hot air blowing element is arranged parallel to the axial direction of the housing, and the air outlet direction of the second hot air blowing element is arranged parallel to the radial direction of the housing.

[0010] By adopting the above technical solution, the housing is heated simultaneously from both axial and radial dimensions, so that the hot air flow field can surround the outer wall, inner hole and inner wall of the housing, achieving synchronous and uniform heating effect in both circumferential and axial directions. Its advantage is that it completely solves the limitation of heating in one direction, with high heating efficiency and uniform temperature field, laying a solid foundation for subsequent high-precision press fitting.

[0011] Preferably, the hot air blowing assembly further includes an infrared temperature sensor, which is used to detect the heating temperature of the casing in real time.

[0012] By adopting the above technical solution and using non-contact infrared temperature measurement, the surface temperature change of the housing during the heating process can be monitored in real time and accurately. This temperature data can be fed back to relevant control components to form a closed-loop control, enabling the system to dynamically adjust the output power or heating time of the hot-blown parts based on the real-time temperature, ensuring that the housing is precisely heated to the required process temperature range. This design effectively prevents the housing from being damaged due to overheating or from not expanding sufficiently due to underheating, thereby further improving the reliability of the pressing process and the consistency of the product while ensuring heating quality.

[0013] Preferably, the assembly component includes a moving component and a clamping component. The clamping component is used to clamp the stator, and the moving component is used to drive the clamping component to move, so as to achieve press-fitting of the stator and the housing.

[0014] By adopting the above technical solution, the clamping component is used to clamp the stator, and the moving component is used to drive the clamping component to move, so as to realize the entire process of gripping, moving and precisely pressing the stator into the heated housing. By enabling the stator to be stably clamped and smoothly pressed into the housing along the preset path, an automated and high-precision pressing fit effect is achieved. Its advantage is that it seamlessly connects the heating and pressing processes, reduces intermediate transfer links, protects the workpiece, and greatly improves the production cycle.

[0015] Preferably, the clamping assembly includes a jaw, the jaw including a pressing portion and a clamping portion, the clamping portion being expandable to clamp the stator, and the pressing portion being capable of pressing down to clamp the stator and the housing.

[0016] By adopting the above technical solution, the one-piece molded gripper achieves a continuous operation of clamping positioning and pressing assembly through the coordinated cooperation of the clamping part and the pressing part. During operation, the clamping part first expands radially to firmly grasp the stator. Subsequently, the pressing part contacts and presses the stator and the housing during axial movement to complete the precision assembly. This integrated design ensures the overall structural strength and operational stability of the gripper. Its advantages are that it not only ensures the precise alignment of the stator and the inner hole of the housing, effectively preventing tilting and offset during the pressing process, but also significantly improves the reliability of the pressing process and the fitting accuracy of the finished product by simplifying the component structure.

[0017] Preferably, the gripping portion of the gripper is provided with a rubber layer to prevent scratching the stator during the gripping process.

[0018] By adopting the above technical solution, when the grippers expand to hold the inner wall of the stator, the elastic deformation of the rubber increases the contact area and buffers the clamping force, so that the enameled wire or insulation layer of the inner wall of the stator is flexibly protected, achieving a non-damaging clamping effect. Its advantage is that it fundamentally avoids the scratches or indentations that may be caused by traditional metal grippers, perfectly protects the electromagnetic and insulation properties of the stator, and ensures the final quality of the product.

[0019] Preferably, the sliding assembly includes a slide rail and a slide table, the slide table being connected to the limiting assembly and capable of moving along the slide rail to adjust the relative position between the housing and the hot air blowing assembly.

[0020] By adopting the above technical solution, the casing can be accurately delivered to the optimal heating station and removed after heating, achieving precise transmission and positioning of the workpiece between stations. Its advantage lies in ensuring the stability of the heating distance and angle, thereby ensuring the uniformity of heating of each product, while improving the smoothness of equipment operation and the level of automation.

[0021] Preferably, the limiting component includes a stator portion for defining the stator and a housing portion for defining the housing.

[0022] By adopting the above technical solution, the stator and the housing can maintain a certain positional relationship before and after pressing, achieving a precise alignment effect between the two at the moment of pressing. Through separate positioning, the structural design of each is simplified, the debugging difficulty is reduced, and the overlap of the pressing axis is fundamentally guaranteed, avoiding the risk of misalignment.

[0023] Preferably, the housing is an electric chuck, which includes a chuck body and a servo motor. The servo motor is connected to the chuck body for driving its rotation and clamping.

[0024] By adopting the above technical solution, the electric chuck can precisely control the continuous or indexed uniform rotation of the housing held on it. During the process of the hot air assembly heating the housing from multiple directions, the rotational movement of the housing ensures that all parts, such as its outer cylindrical surface, end face, and inner hole, are continuously and alternately exposed to the hot air flow field, achieving dynamic and uniform heating in the circumferential direction. This rotational mechanism, in conjunction with the multi-directional hot air, constitutes a synergistic heating mode, which can completely eliminate the local shadow areas and temperature dead zones that are difficult to avoid with fixed heating. This ensures the uniformity and consistency of the thermal expansion of the housing in three-dimensional space, providing a crucial process foundation for the subsequent high-precision press-fitting of the stator.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. By configuring the air outlet direction of the hot air blowing component to blow the housing synchronously from at least two different directions, and combining it with the housing rotation driven by the electric chuck, dynamic and uniform heating of the housing in the circumferential and axial directions is achieved, effectively eliminating local overheating and temperature dead zones, and fundamentally avoiding poor pressing and product deformation caused by uneven heating. 2. Through the coordinated operation of the sliding components, limiting components, and assembly components under the control of the control components, the entire process of the machine casing, from material feeding and heating to stator pressing, is automated. The close connection between each workstation and the precise movements significantly improve production efficiency, while intelligent control reduces human intervention and operational errors. 3. By employing grippers with functional partitions for pressing and clamping, self-guiding positioning of the stator is achieved during the pressing process. Simultaneously, a rubber layer in the clamping section ensures damage-free clamping of the stator. This design effectively prevents scratches and indentations on the enameled wire or insulation layer of the stator's inner wall, thus guaranteeing the final electromagnetic performance and reliability of the product. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the housing heat fitting machine in Embodiment 1. Figure 2 This is a schematic diagram of the housing heat fitting machine in Embodiment 1. Figure 3 for Figure 2 The enlarged view shown in section I; Figure 4 This is a schematic diagram of the clamping component in Embodiment 1.

[0027] Reference numerals: 1. Limiting assembly; 11. Stator; 12. Housing; 121. Chuck body; 122. Power component; 2. Sliding assembly; 21. Slide rail; 22. Slide table; 3. Hot air blowing assembly; 31. First hot air blowing component; 32. Second hot air blowing component; 33. Infrared temperature sensor; 4. Assembly assembly; 41. Moving assembly; 42. Clamping assembly; 421. Gripper; 5. Frame. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0029] This application discloses a housing heat fitting press machine.

[0030] Example 1 Reference Figures 1-4 The system includes a frame 5, and a limiting component 1, a sliding component 2, a hot air blowing component 3, and an assembly component 4 mounted on the frame 5. The sliding component 2 is fixed to the frame 5; the limiting component 1 is mounted on the sliding component 2 and can move with it; the hot air blowing component 3 is positioned on the frame 5 corresponding to the movement path of the limiting component 1 and is used to operate the housing at the heating station; the assembly component 4 is located at the pressing station behind the hot air blowing component 3, mounted on the frame 5, and is used to perform subsequent pressing operations.

[0031] The limiting component 1 is used to accurately position the housing and the stator respectively, ensuring that they maintain a stable position during the pressing process. The sliding component 2 is firmly connected to the limiting component 1 and can drive the limiting component 1 and the workpiece it carries to move along a predetermined path, thereby conveying the housing to the heating station and the pressing station in sequence.

[0032] The sliding assembly 2 includes a parallel slide rail 21, a slide table 22 that slides with the slide rail 21, and a lead screw assembly driven by a motor. The slide rail 21 is symmetrically fixed to the frame 5 by bolts, and the lead screw assembly is fixed by bolts and set parallel to the slide rail 21. Its lead screw nut is connected to the slide table 22, thus forming a precision transmission mechanism driven by a motor and converting the rotational motion into the linear motion of the slide table 22 through the lead screw assembly.

[0033] The limiting assembly 1 consists of a stator portion 11 and a housing portion 12, which are axially collinear and mounted opposite each other, with their common axis parallel to the extension direction of the slide rail 21. The stator portion 11 is used to support and position the stator before press-fitting, while the housing portion 12 is used to fix and position the housing. The stator portion 11 is a pneumatic chuck, and the housing portion is an electric chuck. Both pneumatic and electric chucks are existing technologies. Specifically, the housing portion includes a chuck body 121 and a motor, which is a power component 122 (which can also be replaced by other power mechanisms). 1. The motor is fixed to the slide table 22 by bolts. The motor passes through the reserved space on the slide table 22 and is connected to the chuck body 121 to drive its rotation. There may also be a transmission mechanism between the motor and the chuck body. The chuck body is used to directly clamp or position the machine housing, so that the motor drives the chuck body 121 and the machine housing on it to rotate slowly together. In the subsequent hot air blowing process, the entire circumference of the machine housing can be evenly heated by hot air, which completely eliminates the shadow area or dead zone that may exist in fixed heating and realizes dynamic and all-round uniform heating.

[0034] The hot air blowing assembly 3 includes a first hot air blowing element 31 and a second hot air blowing element 32. The first hot air blowing element 31 and the second hot air blowing element 32 are connected to the frame 5 by bracket bolts. The first hot air blowing element 31 is usually arranged axially, and its air outlet direction is parallel to the axial direction of the housing. It is intended to heat the outer wall, inner hole and inner wall of the housing. The second hot air blowing element 32 is arranged transversely, and its air outlet direction is parallel to the radial direction of the housing. It is mainly used to heat the cylindrical outer surface of the housing. This multi-directional coordinated heating method enables the housing to absorb heat quickly and evenly in the circumferential and axial directions, effectively eliminating the phenomenon of local overheating or insufficient heating caused by unidirectional heating.

[0035] Assembly component 4 is responsible for performing the final pressing operation and mainly consists of two parts: moving component 41 and clamping component 42.

[0036] The main body of the moving component 41 is a portal frame, which is bolted to the frame 5 and spans across the moving path of the sliding component 2. A vertical precision slide rail is mounted on the frame, and a lifting slide plate driven and controlled by an electric cylinder is slidably connected to the slide rail. A hydraulic cylinder is bolted to the bottom of the lifting slide plate, and the piston rod of the hydraulic cylinder is connected to the clamping component 42.

[0037] The clamping assembly 42, as a component that directly operates the stator, is pneumatically driven. Its core is a dedicated gripper 421 with a stepped profile, approximating a "7" shape. The gripper 421 includes an integrally formed pressing part and a clamping part. During operation, the clamping assembly 42 first descends as a whole under the drive of the moving assembly 41. The clamping part is first inserted into the stator's inner hole, achieving initial guidance and positioning. Subsequently, the clamping assembly 42 drives the clamping part of the gripper 421 to expand outward, thereby firmly clamping the inner wall of the stator and effectively protecting the enameled wire or insulation layer of the stator's inner wall. The gripping surface of the gripper 421 is covered with a rubber layer that has both a high coefficient of friction and good elasticity. This rubber layer can provide sufficient friction to prevent slippage and can also buffer the clamping force through elastic deformation, fundamentally avoiding the generation of scratches or indentations. Finally, after the gripping assembly 42 stably grips the stator, it is driven by the electric cylinder in the moving assembly 41 to descend smoothly in the vertical direction, accurately and uniformly pressing the stator into the heated and expanded inner hole of the housing, completing the entire press fit. During the pressing process of the gripping assembly, the pressing part can press the stator vertically when the gripping part contracts, thus playing a pressing role.

[0038] Furthermore, in this embodiment, the entire pressing process is centrally scheduled and precisely controlled by a central controller (typically a PLC or industrial computer). This control unit establishes communication connections with all drivers and sensors of the hot air blowing assembly 3, the sliding assembly 2, and the assembly assembly 4, forming a complete control system. It precisely manages the temperature and time of the heating process, coordinates the precise positioning and movement of the slide table 22, and regulates the speed and depth of the pressing operation by executing pre-programmed instructions. This integrated control system ensures fully automated and intelligent operation from heating to pressing, ultimately achieving extremely high product consistency and pressing quality while significantly improving production efficiency.

[0039] Furthermore, in this embodiment, the hot air blowing assembly 3 is also equipped with an infrared temperature sensor 33. The infrared temperature sensor 33 is bolted to the frame 5. Through non-contact infrared temperature measurement, the infrared temperature sensor 33 can monitor the surface temperature change of the housing in real time and accurately during the heating process. This temperature data can be fed back to relevant control components to form a closed-loop control, enabling the system to dynamically adjust the output power or heating time of the hot air blowing component according to the real-time temperature, ensuring that the housing is accurately heated to the required process temperature range. This design effectively prevents the housing from being damaged due to overheating or from not expanding sufficiently due to underheating, thereby ensuring heating quality while further improving the reliability of the pressing process and the consistency of the product.

[0040] Specifically, the working process of the housing heat fitting press is as follows: First, the operator mounts the housing and stator onto the housing section 12 and stator section 11 of the limiting assembly 1, respectively. Then, the equipment is started, and the sliding assembly 2 begins to work. Through the servo motor driving the lead screw mechanism, it moves the entire limiting assembly and the workpiece on it along the slide rail 21, accurately conveying the housing to the hot air heating station.

[0041] Once the housing arrives and is positioned at the heating station, the hot air blowing assembly 3 begins operation. The first hot air blowing element 31 blows along the axial direction of the housing, heating its end face, inner hole, and inner wall; the second hot air blowing element 32 blows along the radial direction of the housing, heating its outer cylindrical surface. Simultaneously, the electric chuck of the housing section 12 drives the housing to rotate at a uniform speed, and the infrared temperature sensor 33 monitors the housing temperature in real time, ensuring that the housing is accurately heated to the preset process temperature range.

[0042] While the hot air blowing assembly 3 is heating, the assembly process starts. The clamping assembly 42 of the assembly assembly 4 begins to descend, and the clamping part of its jaws 421 expands outward to firmly clamp the inner wall of the stator. The rubber layer on the surface of the clamping part provides flexible protection to ensure that the inner wall of the stator is undamaged.

[0043] After heating is completed, the sliding component 2 is started again to move the heated housing to the pressing station. Then, the moving component 41 drives the clamping component 42, which has gripped the stator, to press down smoothly and accurately press the stator into the inner hole of the heated and expanded housing. During this pressing process, the pressing part of the gripper 421 continuously provides downward pressure to ensure that the stator and the housing are fully pressed into place.

[0044] Furthermore, in this embodiment, the clamping component can also be a pneumatic chuck.

[0045] Example 2 In this embodiment, another implementation scheme for a housing heat fitting press is provided. Except for the specific configuration of the hot air blowing assembly 3, the rest of the structure in this embodiment is the same as that in embodiment 1.

[0046] The core of this embodiment lies in further expanding the configuration of the heat blowing assembly 3. Unlike the two specific heat blowing directions in Embodiment 1, this embodiment does not impose restrictive requirements on the specific number, spatial arrangement, and air outlet direction of the heat blowing components. Its technical feature is that the air outlet direction of the multiple heat blowing components included in the heat blowing assembly 3 is configured to blow the casing from at least two different spatial directions. These blowings can be synchronous or performed in a set sequence to ensure that the casing can be uniformly heated in both the circumferential and axial directions.

[0047] As a non-limiting example, the hot air blowing assembly 3 may include three or more hot air blowing elements. These hot air blowing elements may be uniformly or non-uniformly distributed around the circumference of the casing, and their airflow direction can be flexibly adjusted to collectively cover key heated parts of the casing, such as the outer cylindrical surface, end face, and inner hole. Those skilled in the art will understand that any design scheme of the hot air blowing assembly 3 that achieves uniform heating of the casing through multiple airflow configurations in different directions, as long as it can ensure that the hot air flow field fully covers the casing and effectively eliminates localized low-temperature areas, falls within the technical solutions covered by this embodiment.

[0048] This flexible configuration concept allows those skilled in the art to adjust the number, installation position, and air outlet angle of the hot air blowing components according to parameters such as the geometry, structural dimensions, and heat capacity of a specific housing. This design significantly improves the adaptability and versatility of the equipment, enabling the same pressing equipment to quickly adapt to the production needs of various product models through modular adjustments of the hot air blowing component 3, thus broadening the application range of the equipment while ensuring heating quality and uniformity.

[0049] It should be noted that the various embodiments of this application can be arbitrarily combined into new embodiments, provided that the solutions do not conflict and the technical solutions can coexist.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A housing heat fitting press machine, characterized in that: include Limiting component (1) is used to position the housing and stator; The sliding component (2) is connected to the limiting component (1) and is used to drive the limiting component (1) to move; A hot air blowing assembly (3) is used to uniformly heat the casing, and the air outlet direction of the hot air blowing assembly (3) is configured to blow the casing from at least two different directions; Assembly component (4) is used to press the stator into the housing.

2. The housing heat fitting press-fitting machine according to claim 1, characterized in that: The hot air blowing assembly (3) includes a first hot air blowing element (31) and a second hot air blowing element (32). The air outlet direction of the first hot air blowing element (31) is parallel to the axial direction of the housing, and the air outlet direction of the second hot air blowing element (32) is parallel to the radial direction of the housing.

3. The housing heat fitting press-fitting machine according to claim 1 or 2, characterized in that: The hot air blowing assembly (3) also includes an infrared temperature sensor (33), which is used to detect the heating temperature of the casing in real time.

4. The housing heat fitting press-fitting machine according to claim 1, characterized in that: The assembly component (4) includes a moving component (41) and a clamping component (42). The clamping component (42) is used to clamp the stator, and the moving component (41) is used to drive the clamping component (42) to move so as to achieve press-fitting of the stator and the housing.

5. The housing heat fitting press-fitting machine according to claim 4, characterized in that: The clamping assembly (42) includes a jaw (421), which includes a pressing part and a clamping part. The clamping part is expandable to clamp the stator, and the pressing part is capable of pressing down to clamp the stator and the housing.

6. The housing heat fitting press-fitting machine according to claim 5, characterized in that: The gripping part of the jaw (421) is provided with a rubber layer to prevent the stator from being scratched during the gripping process.

7. The housing heat fitting press-fitting machine according to claim 1, characterized in that: The sliding assembly (2) includes a slide rail (21) and a slide table (22). The slide table (22) is connected to the limiting assembly (1) and can move along the slide rail (21) to adjust the relative position between the housing and the hot air blowing assembly (3).

8. The housing heat fitting press-fitting machine according to claim 1, characterized in that: The limiting component (1) includes a stator portion (11) for defining the stator and a housing portion (12) for defining the housing.

9. The housing heat fitting press-fitting machine according to claim 8, characterized in that: The housing part (12) is an electric chuck, which includes a chuck body (121) and a servo motor. The servo motor is connected to the chuck body (121) for driving it to rotate and clamp.

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