Motor volute assembly machine and assembly method thereof

Abstract

The present invention relates to a motor volute assembly machine and an assembly method thereof, comprising a fluid stator, wherein the outer wall of the fluid stator is fixedly connected with a plurality of groups of electromagnetic expansion components. The above structure is adopted to realize automatic centering and clamping of the volute. During the assembly process, induction heating is combined with a precisely controlled cooling cycle to effectively eliminate thermal stress caused by temperature gradient and material deformation. Welding is adopted to improve heat conduction between the motor and the volute, simplify the assembly process, reduce assembly tolerance, improve sealing and reliability. By preheating and controlling the cooling rate, residual stress in the weld area is reduced, and the risk of cracks and structural failure is avoided. Combined with pulse eddy current detection technology, real-time monitoring of weld quality is realized, ensuring product reliability. In addition, high-pressure water pressure test, as the final link of the assembly process, strictly checks the integrity of the volute structure to ensure its safe and stable operation under extreme working conditions.

Description

Technical Field

[0001] The present invention relates to a motor volute assembly machine and an assembly method thereof, and in particular to a motor volute assembly machine and an assembly method thereof applied in the field of automated assembly equipment. Background Art

[0002] In the motor manufacturing industry, the volute is an important part of the motor. Its main function is to guide air or water flow and optimize the efficiency and performance of the motor. The traditional volute assembly process usually relies on manual operation, including manual alignment and fixation of the volute with the motor shaft, bearings, fans and other components. This method is not only labor-intensive and inefficient, but also the assembly accuracy is limited by the operator's skills and experience, making it difficult to ensure consistency and reliability.

[0003] The specification of Chinese invention patent CN 110653582 A discloses an automatic volute assembly machine, comprising a frame and a middle plate conveying frame, wherein the middle plate conveying frame is located in front of the frame; two push cylinders are hingedly connected to the rear wall surface of a connecting beam provided below the rear end of the middle plate conveying frame, and the ends of the push rods of the two push cylinders are hingedly connected to a flip frame, and the rear ends of the horizontal parts of the two flip frames are hingedly connected to rollers; it can lift the rear end of the middle plate to be processed, and automatically fix and align the end plate of the volute, and can automatically descend and rotate, connect the middle plate to be processed with the end plate to directly assemble the volute, and it has a high degree of automation, good effect, high efficiency, and greatly reduces the amount of manual labor.

[0004] The above design provides a volute automatic assembly machine, which realizes the automatic assembly of the volute and improves the assembly efficiency, but there are still certain limitations, such as the inability to complete the automatic assembly of the volute and the motor, the inability to achieve automatic centering and clamping of the volute and the motor, the large assembly tolerance, and the large number of assembly parts. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a motor volute assembly machine and an assembly method thereof, so as to realize automatic centering and clamping of the volute and eliminate assembly stress, assemble the volute together by welding, simplify the assembly process, reduce assembly tolerance, improve sealing and reliability, and perform pressure testing after assembly to avoid leakage.

[0006] In order to solve the above problems, the present invention provides a motor volute assembly machine and an assembly method thereof, including a fluid stator, the outer wall of the fluid stator is fixedly connected to multiple groups of electromagnetic expansion components, and the multiple groups of electromagnetic expansion components are evenly distributed along the axial direction of the fluid stator, the electromagnetic expansion component includes a support ring fixedly connected to the fluid stator, the inner end of the support ring is fixedly connected to multiple slide rails, and the multiple slide rails are fixedly connected to the fluid stator at one end close to the fluid stator, the outer ends of the multiple slide rails are slidably connected to sliding sleeves, the outer ends of the multiple sliding sleeves are fixedly connected to annular frames, the outer ends of the multiple annular frames are wound with expansion coils, the expansion coils are electrically connected to the control system through wires, the outer ends of the annular frames are fixedly connected to expansion plates, and the expansion plates are fixedly connected to the outer ends of the annular frames. The outer end is contacted with a volute, and the outer end of the volute is contacted with a magnetorheological fluid chamber, the outer wall of the magnetorheological fluid chamber is fixedly connected with a shell, the outer wall of the shell is wound with a clamping coil, the top of the shell is fixedly connected with a support plate, the bottom end of the support plate is fixedly connected with an insulating layer, and the inner wall of the insulating layer is contacted with the clamping coil, the outer wall of the insulating layer is rotatably connected with a fluid rotor, and the inner wall of the fluid rotor is rotatably connected to the outer wall of the fluid stator, the outer wall of the fluid rotor is fixedly connected with a cantilever, the end of the cantilever is fixedly connected with an annular winding frame, the outer end of the annular winding frame is wound with an induction heating coil, the bottom end of the annular winding frame is fixedly connected with a detection winding frame, the outer end of the detection winding frame is wound with a detection coil, and the outer end of the detection winding frame is fixedly connected with a welding head.

[0007] As a further improvement of the present application, the outer wall of the fluid rotor is fixedly connected to a gear ring, the outer end of the gear ring is meshingly connected to a drive motor, the top of the drive motor is fixedly connected to a fixed plate, and the top of the fixed plate is fixedly connected to a multi-stage electric cylinder.

[0008] As a further improvement of the present application, the outer end of the multi-stage electric cylinder is fixedly connected to a frame, the outer end of the frame is slidably connected to a guide slide, the top of the guide slide is fixedly connected to the secondary cylinder body of the multi-stage electric cylinder, the top of the fixed plate is fixedly connected to multiple guide rods, and the multiple guide rods are all slidably connected to the guide slide.

[0009] As a further improvement of the present application, a positioning plate is fixedly connected to the bottom end of the frame, a motor is fixedly connected to the top end of the positioning plate, the top end of the motor is fixedly connected to the volute, and an end cover is fixedly connected to the outlet end of the volute.

[0010] As another improvement of the present application, the magnetorheological fluid chamber is filled with magnetorheological fluid, the base fluid of the magnetorheological fluid is poly-alpha-olefin (PAO), the particle size of the magnetic particles ranges from 1 micron to 5 microns, and an annular cavity is opened inside the fluid rotor.

[0011] As another improvement supplement of the present application, a cooling channel is provided inside the fluid rotor, the cooling channel is connected with the annular cavity, a first annular groove is provided on the inner wall of the fluid rotor, a second annular groove is provided on the inner wall of the fluid rotor, a through hole is provided at the position of the fluid stator corresponding to the first annular groove, a flow channel is provided at the center of the fluid stator, and the first annular groove is connected with the flow channel, the flow channel is connected with a water inlet pipe, a reflux channel is provided at the position of the fluid stator corresponding to the second annular groove, and the reflux channel is connected with an external reflux pipe.

[0012] As another improvement supplement of the present application, a first cooling channel and a second cooling channel are opened inside the cantilever, the end of the first cooling channel is connected to the annular winding frame through a pipe, the end of the second cooling channel is connected to the detection winding frame, the first cooling channel and the annular cavity are connected to each other, and the second cooling channel is connected to the second annular groove through a pipe.

[0013] As another improvement of the present application, the detection coil adopts a differential design, including a pair of coaxially arranged primary coil and secondary coil, the turns ratio of the primary coil and the secondary coil is 1:1 to 1:3, the pulse frequency of the detection coil is 10kHz to 1MHz, and the material of the detection coil is ultrafine enameled wire with a wire diameter of less than 0.1mm.

[0014] The steps include:

[0015] S1, centering clamping;

[0016] After the assembly machine is installed, the volute is sent into the assembly machine manually or by equipment, and the control system drives multiple sets of electromagnetic expansion components to clamp the volute, install the motor on the positioning plate, and position and clamp the motor so that the center of the volute is aligned with the center of the motor;

[0017] S2, induction heating;

[0018] When the volute is centered and clamped, the control system starts the drive motor, which drives the gear ring to rotate, and the gear ring drives the fluid rotor to rotate, while controlling the induction heating coil to heat the assembly area of ​​the volute;

[0019] S3, assembly docking;

[0020] While rotating and heating the assembly area of ​​the volute, the control system drives the multi-stage electric cylinder to drive the expansion assembly and the volute to move downward, and at the same time the induction heating coil induction heats the clamping part of the motor, and at the same time the multi-stage electric cylinder applies pressure to clamp the volute and the motor, and compresses the sealing ring in the volute;

[0021] S4, laser welding;

[0022] S5, circulating cooling;

[0023] S6. Weld inspection;

[0024] S7. Stress test.

[0025] In summary, this application has the following beneficial effects:

[0026] 1. Automatic centering and clamping: Through the precise control of the electromagnetic expansion assembly, the volute can be quickly and accurately centered and clamped, avoiding the positioning error and damage that may be introduced by traditional mechanical fixtures, improving the geometric accuracy and production efficiency of assembly, and utilizing the characteristics of magnetorheological fluid to achieve non-contact clamping of the outer wall of the volute inlet pipe, avoiding the damage that may be caused by direct contact. Especially for sensitive or fragile materials, this method can effectively protect the surface from damage and ensure the integrity and functionality of the parts.

[0027] 2. Stress relief; During the assembly process, the thermal stress caused by temperature gradient and material deformation can be effectively relieved through precisely controlled induction heating and cooling cycles. Especially in the welding stage, the strategy of preheating and controlling the cooling rate can reduce the residual stress in the weld area and avoid cracks and structural failure caused by stress concentration. By precisely controlling the heating and cooling process, not only the assembly accuracy is improved, but also the operating temperature of key components is ensured to be in an ideal state, reducing thermal stress and extending the life of the equipment.

[0028] 3. Laser welding and weld quality control: The use of laser welding technology, combined with preheating and cooling strategies, improves the weld quality and structural strength, reduces welding defects, and through pulsed eddy current detection technology, it can monitor the weld quality in real time to ensure product reliability.

[0029] 4. Pressure test: After the assembly and welding process, a high-pressure water pressure test is a rigorous test of the structural integrity of the volute. By simulating the pressure environment of the volute under extreme working conditions, it is possible to detect any leaks, cracks or other forms of structural damage, ensuring that the volute can operate safely and stably under the design pressure.

[0030] 5. Automation and intelligent integration: The device integrates advanced control systems and sensors, which can realize the automated assembly process, from centering and clamping to welding detection, with full automated control, which improves production efficiency, reduces human errors, and enhances product quality control. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is the first partial view of this application;

[0032] Figure 2 This is the second partial view of this application;

[0033] Figure 3 This is the third partial view of the present application;

[0034] Figure 4 This is the fourth partial view of this application;

[0035] Figure 5 This is the fifth partial view of the present application;

[0036] Figure 6 This is the front view of the application;

[0037] Figure 7 For this application Figure 6 AA section view;

[0038] Figure 8 It is the second front view of the present application;

[0039] Fig. 9 For this application Figure 8 BB cross-sectional view;

[0040] Fig.10 This is the sixth partial view of the present application;

[0041] Fig.11 This is a schematic diagram of the overall structure of this application.

[0042] Description of the numbers in the figure:

[0043] 1. Fluid stator; 2. Support ring; 3. Slide rail; 4. Sleeve; 5. Annular frame; 6. Expansion coil; 7. Expansion plate; 8. Volute; 9. Magnetorheological fluid chamber; 10. Shell; 11. Clamping coil; 12. Support plate; 13. Insulation layer; 14. Fluid rotor; 15. Cantilever; 16. Annular winding frame; 17. Induction heating coil; 18. Detection winding frame; 19. Detection coil; 20. Welding head; 21. Gear ring; 22. Drive motor; 23. Multi-stage electric cylinder; 24. Frame; 25. Guide slide; 26. Positioning plate; 27. Motor; 28. Annular cavity; 29. ​​First annular groove; 30. Second annular groove. DETAILED DESCRIPTION

[0044] Three implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0045] The first implementation method:

[0046] Figure 1-11 Shown.

[0047] A motor volute assembly machine and an assembly method thereof, comprising a fluid stator 1, wherein the outer wall of the fluid stator 1 is fixedly connected with a plurality of sets of electromagnetic expansion components, and the plurality of sets of electromagnetic expansion components are evenly distributed along the axial direction of the fluid stator 1, the electromagnetic expansion components comprising a support ring 2 fixedly connected with the fluid stator 1, the inner end of the support ring 2 is fixedly connected with a plurality of slide rails 3, and the plurality of slide rails 3 are fixedly connected with one end of the fluid stator 1 close to the fluid stator 1, the outer ends of the plurality of slide rails 3 are all slidably connected with a sliding sleeve 4, the outer ends of the plurality of sliding sleeves 4 are all fixedly connected with an annular frame 5, the outer ends of the plurality of annular frames 5 are all wound with expansion coils 6, the expansion coils 6 are electrically connected to a control system through a wire, the outer end of the annular frame 5 is fixedly connected with an expansion plate 7, the outer end of the expansion plate 7 is contacted with a volute 8, and the outer end of the volute 8 is contacted with a magnetic fluid The outer wall of the magnetorheological fluid chamber 9 is fixedly connected to a shell 10, and a clamping coil 11 is wound around the outer wall of the shell 10. The top of the shell 10 is fixedly connected to a support plate 12, and the bottom end of the support plate 12 is fixedly connected to an insulating layer 13, and the inner wall of the insulating layer 13 is in contact with the clamping coil 11. The outer wall of the insulating layer 13 is rotatably connected to a fluid rotor 14, and the inner wall of the fluid rotor 14 is rotatably connected to the outer wall of the fluid stator 1. The outer wall of the fluid rotor 14 is fixedly connected to a cantilever 15, and the end of the cantilever 15 is fixedly connected to a ring-shaped winding frame 16, and the outer end of the ring-shaped winding frame 16 is wound with an induction heating coil 17, and the bottom end of the ring-shaped winding frame 16 is fixedly connected to a detection winding frame 18, and the outer end of the detection winding frame 18 is wound with a detection coil 19, and the outer end of the detection winding frame 18 is fixedly connected to a welding head 20.

[0048] The fluid stator 1 serves as a basic supporting structure, and its outer wall is fixedly connected to the electromagnetic expansion assembly to achieve centering and clamping of the volute 8. The support ring 2 is fixedly connected to the fluid stator 1 and is used to support the expansion assembly, provide a stable support point, and ensure the stability of the slide rail 3. The slide rail 3 connects the support ring 2 and the sliding sleeve 4, allowing the sliding sleeve 4 to move along the sliding rail 3 to complete the centering and clamping of the volute 8. The sliding sleeve 4 supports the annular frame 5 to facilitate the radial movement of the annular frame 5. The annular frame 5 is used to wind the expansion coil 6, which is fixedly connected to the expansion plate 7. The expansion coil 6 is electrically connected to the control system and may be used to achieve radial movement of the annular frame 5. The expansion plate 7 is in direct contact with the volute 8 to transmit radial pressure. The magnetorheological fluid chamber 9 is fixedly connected to the shell 10 and may be used to store and control the magnetorheological fluid. The shell 10 is wound with a clamping coil 1 1. Generate a magnetic field to enhance or weaken the clamping force on the outer wall of the inlet pipe of the volute 8, realize non-contact clamping of the volute 8, and avoid damage that may be caused by direct contact. The support plate 12 is used to support the fluid rotor 14. The inner wall of the insulating layer 13 is in contact with the clamping coil 11. The outer wall is rotatably connected to the fluid rotor 14 to achieve insulation and rotation connection. The inner wall of the fluid rotor 14 is rotatably connected to the fluid stator to achieve rotary induction heating and rotary welding, and coolant delivery. The cantilever 15 provides a cooling channel and provides support for the annular winding frame 16 and the detection winding frame 18. The outer end of the annular winding frame 16 is wound with an induction heating coil 17, and the bottom end of the annular winding frame 16 is fixed with a detection winding frame 18, which may be used to achieve weld preheating and weld detection. The welding head 20 is fixedly connected to the detection winding frame 18 to achieve precise welding of the volute 8.

[0049] The second implementation method:

[0050] Figure 1-11 Shown.

[0051] The outer wall of the fluid rotor 14 is fixedly connected with a gear ring 21 , the outer end of the gear ring 21 is meshingly connected with a drive motor 22 , the top of the drive motor 22 is fixedly connected with a fixed plate , and the top of the fixed plate is fixedly connected with a multi-stage electric cylinder 23 .

[0052] The outer end of the multi-stage electric cylinder 23 is fixedly connected to a frame 24, and the outer end of the frame 24 is slidably connected to a guide slide 25. The top of the guide slide 25 is fixedly connected to the secondary cylinder body of the multi-stage electric cylinder 23, and the top of the fixed plate is fixedly connected to multiple guide rods, and the multiple guide rods are all slidably connected to the guide slide 25.

[0053] A positioning plate 26 is fixedly connected to the bottom end of the frame 24 , a motor 27 is fixedly connected to the top end of the positioning plate 26 , a top end of the motor 27 is fixedly connected to the volute 8 , and an end cover is fixedly connected to the outlet end of the volute 8 .

[0054] The magnetorheological fluid chamber 9 is filled with magnetorheological fluid. The base fluid of the magnetorheological fluid is poly-alpha-olefin PAO. The particle size of the magnetic particles ranges from 1 micron to 5 microns. An annular cavity 28 is opened inside the fluid rotor 14 .

[0055] A cooling channel is provided inside the fluid rotor 14, and the cooling channel is communicated with the annular cavity 28. A first annular groove 29 is provided on the inner wall of the fluid rotor 14, and a second annular groove 30 is provided on the inner wall of the fluid rotor 14. A through hole is provided at a position of the fluid stator 1 corresponding to the first annular groove 29. A flow channel is provided at the center of the fluid stator 1, and the first annular groove 29 is communicated with the flow channel, and the flow channel is communicated with the water inlet pipe. A reflux channel is provided at a position of the fluid stator 1 corresponding to the second annular groove 30, and the reflux channel is communicated with an external reflux pipe.

[0056] A first cooling channel and a second cooling channel are provided inside the cantilever 15. The end of the first cooling channel is connected to the annular winding frame 16 through a pipe, and the end of the second cooling channel is connected to the detection winding frame 18. The first cooling channel is connected to the annular cavity 28, and the second cooling channel is connected to the second annular groove 30 through a pipe.

[0057] The detection coil 19 adopts a differential design, including a pair of coaxially arranged primary coil and secondary coil, the turns ratio of the primary coil and the secondary coil is 1:1 to 1:3, the detection coil 19 operates at a specific pulse frequency, the pulse frequency is 10kHz to 1MHz, and the material of the detection coil 19 is ultra-fine enameled wire with a wire diameter of less than 0.1mm.

[0058] The gear ring 21 is fixedly connected to the outer wall of the fluid rotor 14 and meshes with the drive motor 22, which can accurately control the rotation speed and direction of the fluid rotor 14, and is convenient for adjusting induction heating and rotary welding. The multi-stage electric cylinder 23 provides high-precision linear motion control capability, which can achieve subtle position adjustments during the assembly process and enhance the accuracy and stability of assembly. The guide slide 25 is fixedly connected to the secondary cylinder body of the multi-stage electric cylinder 23, and is slidably connected to multiple guide rods at the top of the fixed plate to ensure smoothness of movement and accuracy of guidance, thereby reducing deviations during assembly. The positioning plate 26 is fixed to the bottom end of the frame 24 and is used to position the motor 27, which helps to maintain the stable positioning of the volute 8 during assembly.

[0059] The magnetorheological fluid in the magnetorheological fluid chamber 9 uses polyalphaolefin PAO as the base fluid, and the magnetic particle size is 1 micron to 5 microns. This configuration can provide excellent magnetorheological properties, so that the magnetorheological fluid responds quickly under the action of the magnetic field, and the outer wall of the inlet pipe of the volute 8 is clamped. The annular cavity 28 is connected to the cooling channel inside the fluid rotor 14, and is connected to the flow channel of the fluid stator 1 through the first annular groove 29 and the second annular groove 30, so as to realize the circulation cooling of the expansion component, induction heating, and detection coil 19. The first cooling channel and the second cooling channel are respectively connected to the annular winding frame 16 and the detection winding frame 18. , so that the cooling water circulates smoothly. The detection coil 19 adopts a coaxial arrangement of the primary coil and the secondary coil, and works at a pulse frequency of 10kHz to 1MHz, which is conducive to balancing the detection depth and resolution and improving the ability to identify subtle defects. It is made of ultra-fine enameled wire with a diameter of less than 0.1mm, which reduces the coil's own inductance and improves the steepness of the rising edge of the pulse signal and the detection sensitivity. The turns ratio of the primary coil and the secondary coil is 1:1 to 1:3, where the primary coil is used to generate instantaneous eddy currents, and the secondary coil is used to detect eddy current change signals caused by weld defects, thereby improving detection sensitivity and signal-to-noise ratio.

[0060] The third implementation method:

[0061] Figure 1-11 Shown.

[0062] The steps include:

[0063] S1, centering clamping;

[0064] After the assembly machine is installed, the volute 8 is sent into the assembly machine manually or by equipment, and the control system drives multiple sets of electromagnetic expansion components to clamp the volute 8. The expansion coils 6 are synchronously activated through the control system, and the polarities of each layer of adjacent expansion coils 6 are set to alternate. The magnetic lines of force in the expansion components are closed internally, generating an outward radial repulsive force, which prompts the annular frame 5 to expand uniformly toward the inner wall of the inlet pipe of the volute 8. Since the annular frame 5 is fixedly connected to the sliding sleeve 4, the annular frame 5 slides radially along the slide rail 3, and the annular frame 5 pushes the expansion plate 7 to achieve radial expansion, so that the expansion plate 7 is tightly fitted with the inner wall of the inlet pipe of the volute 8. In the early stage of expansion, a higher current is used to quickly reach the predetermined expansion degree, and then the current is reduced to maintain a stable clamping force, so that the volute can achieve the effect of clamping and centering, and at the same time, the clamping coil 11 is controlled to generate a magnetic field , so that the magnetic ions in the magnetorheological fluid chamber 9 are oriented and arranged to clamp the outer wall of the volute inlet pipe, further enhancing the clamping effect and sealing the volute inlet pipe, providing conditions for subsequent pressure testing. After the centering clamping is completed, the volute 8 is lifted to the initial position by the multi-stage electric cylinder 23 to avoid collision between the motor 27 and the volute 8. Then the motor 27 is installed on the positioning plate 26, and the motor is positioned and clamped to align the center of the volute 8 with the center of the motor 27 to complete the preparation before assembly. When the assembly is completed, the magnetic poles of the electromagnet can be reversed by changing the direction of the current flowing through the expansion coil 6. When the same magnetic poles of all electromagnets face inward, radial attraction will be generated between them, prompting the expansion assembly to shrink toward the center, thereby breaking away from contact with the inner wall of the inlet pipe and releasing the volute 8.

[0065] Using an expansion assembly based on an electromagnet to center and clamp the inlet pipe of the volute 8 can improve the assembly accuracy. The current and magnetic pole direction of the expansion coil 6 are controlled by the control system to achieve fine-tuning of the annular frame 5, ensure that the inlet pipe of the volute 8 is accurately centered in the axial and radial directions, improve the geometric accuracy of the assembly, provide a uniform radial clamping force, avoid the local overpressure or underpressure problems that may be caused by traditional mechanical clamps, and help maintain the shape integrity of the volute and the inlet pipe. Under the action of the electromagnetic force, the expansion assembly contacts the inlet pipe of the volute 8, reducing the risk of direct physical collision and the possibility of damage to the pipe wall. The excitation current of the expansion coil 6 can be adjusted according to the material properties and specific application requirements to control the size of the clamping force and prevent damage to sensitive or fragile materials. The magnetorheological fluid can fill and adapt to irregular or changing surface contours. For the threads of the outer wall of the inlet pipe of the volute 8, the magnetorheological fluid clamping can provide better fit and sealing. The magnetorheological fluid forms a "soft" contact interface, which can distribute pressure even under a higher clamping force, reduce local stress concentration on the outer wall of the volute inlet pipe, and reduce the risk of damage.

[0066] S2, induction heating;

[0067] When the volute 8 is centered and clamped, the control system starts the drive motor 22, which drives the gear ring 21 to rotate, and the gear ring 21 drives the fluid rotor 14 to rotate. At the same time, the expansion plate 7 is controlled to preliminarily heat the assembly area of ​​the volute 8, and when the volute 8 contacts the motor 27, synchronous heating is performed, and the welding between the volute 8 and the motor 27 is preheated.

[0068] Through induction heating, the assembly area of ​​the volute 8 or the motor 27 can be expanded by heat, so that the degree of interference fit can be accurately controlled to ensure the optimal contact area between the volute 8 and the motor 27 during assembly, thereby improving the assembly accuracy. The principle of thermal expansion and contraction allows one component to be easily assembled into another component in a heated state. After cooling, the naturally formed contraction force can strengthen the connection between the components and reduce assembly stress.

[0069] S3, assembly docking;

[0070] While rotating and heating the assembly area of ​​the volute 8, the control system drives the multi-stage electric cylinder 23 to drive the expansion assembly and the volute 8 to move downward, and at the same time, the induction heating coil 17 performs induction heating on the clamping part of the motor 27. At the same time, the multi-stage electric cylinder 23 applies pressure to clamp the volute 8 and the motor 27, and compresses the sealing ring in the volute 8, so that the volute 8 and the motor 27 are clamped together;

[0071] S4, circulating cooling;

[0072] During centering clamping and induction heating, the coil needs to be cooled. Cooling water is introduced from the outside into the flow channel opened at the center of the fluid stator 1. The cooling water enters the cooling channel through the flow channel, then enters the first annular groove 29, and then enters the annular cavity 28 through the first annular groove 29. After passing through the annular cavity 28, it enters the first cooling channel in the cantilever 15, and enters the annular frame 16 through the pipeline to dissipate the heat of the induction heating coil 17 that completes the induction heating. The cooling water enters the detection frame 18 after passing through the annular frame 16 to dissipate the heat of the detection coil 19. After the heat exchange, the cooling water flows out of the detection frame 18 and enters the first annular groove 29 through the second cooling channel. It flows into the reflux channel through the first annular groove 29 and flows back to the outside. At the same time, the cooling water flows into the bottom of the flow channel opened at the center of the fluid stator 1 to dissipate the heat of the expansion component. During the heat dissipation, a valve is provided at the bottom of the fluid stator 1. At this time, the valve is closed to prevent the cooling water from entering the volute 8. When the volute 8 and the motor 27 are installed, the valve is opened to allow the cooling water to enter the volute 8 during the pressure test.

[0073] Circulating cooling can effectively remove the heat generated by induction heating and expansion components, avoiding efficiency loss and equipment failure caused by overheating. By maintaining components within the optimal operating temperature range, it can ensure continuous and efficient operation of the equipment. By effectively dissipating heat, thermal stress caused by temperature fluctuations can be reduced. Thermal stress may cause material fatigue and premature failure of components. A constant temperature environment helps to extend the service life of key components.

[0074] S5, laser welding;

[0075] After the volute 8 and the motor 27 are assembled and docked, the gap between the volute 8 and the motor 27 is welded. While the induction heating coil 17 preheats the weld, the fluid rotor 14 drives the welding head 20 to rotationally weld the volute 8 and the motor 27. When preheated to a predetermined temperature, the induction heating coil 17 is turned off to stop the induction heating. After welding is completed, the weld is inspected.

[0076] Welding the volute 8 and the motor 27 together can strengthen the overall structure and provide a better sealing effect than mechanical connection or adhesive to prevent moisture, dust or other contaminants from entering the interior of the motor. The welding connection can improve the heat conduction between the motor and the volute, help the motor to dissipate heat better, thereby improving the efficiency and performance of the motor and extending its service life. It can also simplify the assembly process, reduce assembly tolerances, and improve sealing and reliability. Induction heating can accurately control the heating area and temperature to ensure that the welding area is heated evenly and reduce thermal stress and deformation caused by local overheating. Preheating can control the cooling rate of the weld and avoid the formation of brittle structure caused by rapid cooling, thereby improving the toughness of the weld. Preheating helps to reduce the solubility of hydrogen in the welding area, reduce the formation of hydrogen-induced cracks and pores, and improve the integrity of the weld.

[0077] S6. Weld inspection;

[0078] After welding is completed, the weld is inspected using pulsed eddy current detection technology. A strong magnetic field is generated in the detection coil 19 through a short current pulse. When this magnetic field is quickly established, eddy currents are induced in the weld. The detection system records the voltage signal generated during the eddy current attenuation process, and analyzes the time-amplitude characteristics and frequency components of the signal through signal processing techniques such as wavelet transform and Fourier transform. By comparing the signal differences between defective and non-defective areas, defects can be identified and located. Further signal processing and pattern recognition techniques, such as machine learning algorithms, can be used to construct a defect quantitative evaluation model to achieve the classification of defects such as cracks, lack of fusion, slag inclusions, etc. According to the detected defects, the weld is subjected to secondary induction heating to re-melt the metal in the defective area and achieve weld repair.

[0079] S7, stress test;

[0080] After assembly and welding, the volute 8 is pressure tested. The outlet pipe of the volute 8 is sealed with an end cover, and cooling water is passed into the flow channel in the center of the fluid stator 1. The valve at the bottom of the fluid stator 1 is opened, and cooling water enters the volute 8. The cooling water is pressurized to the test pressure, and the joints and welds of the volute 8 are observed for leaks. The structural strength and welding quality of the volute 8 are verified to ensure that there will be no leakage, rupture or deformation under the design pressure, and to ensure the safety of the operator and the surrounding environment. During the test, any hidden welding defects, cracks, holes or material discontinuities can be found to avoid accidents.

[0081] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A motor volute assembly machine, characterized in that: The invention comprises a fluid stator (1), wherein the outer wall of the fluid stator (1) is fixedly connected to a plurality of electromagnetic expansion components, and the plurality of electromagnetic expansion components are evenly distributed along the axial direction of the fluid stator (1), wherein the electromagnetic expansion components comprise a support ring (2) fixedly connected to the fluid stator (1), wherein the inner end of the support ring (2) is fixedly connected to a plurality of slide rails (3), and the plurality of slide rails (3) are fixedly connected to the fluid stator (1) at one end thereof close to the fluid stator (1), wherein the outer ends of the plurality of slide rails (3) are slidably connected to a sleeve (4), wherein the outer ends of the plurality of sleeves (4) are fixedly connected to an annular frame (5), wherein the outer ends of the plurality of annular frames (5) are wound with an expansion coil (6), wherein the expansion coil (6) is electrically connected to a control system via a wire, wherein the outer end of the annular frame (5) is fixedly connected to an expansion plate (7), wherein the outer end of the expansion plate (7) is contacted with a volute (8), wherein the outer end of the volute (8) is contacted with a magnetorheological fluid chamber (9), wherein the magnetorheological fluid chamber The outer wall of the fluid stator (9) is fixedly connected to a shell (10), the outer wall of the shell (10) is wound with a clamping coil (11), the top of the shell (10) is fixedly connected to a support plate (12), the bottom end of the support plate (12) is fixedly connected to an insulating layer (13), and the inner wall of the insulating layer (13) is arranged in contact with the clamping coil (11), the outer wall of the insulating layer (13) is rotatably connected to a fluid rotor (14), and the inner wall of the fluid rotor (14) is rotatably connected to the outer wall of the fluid stator (1), the outer wall of the fluid rotor (14) is fixedly connected to a cantilever (15), the end of the cantilever (15) is fixedly connected to an annular winding frame (16), the outer end of the annular winding frame (16) is wound with an induction heating coil (17), the bottom end of the annular winding frame (16) is fixedly connected to a detection winding frame (18), the outer end of the detection winding frame (18) is wound with a detection coil (19), and the outer end of the detection winding frame (18) is fixedly connected to a welding head (20).

2. The motor volute assembly machine according to claim 1, characterized in that: The outer wall of the fluid rotor (14) is fixedly connected to a gear ring (21), the outer end of the gear ring (21) is meshingly connected to a drive motor (22), the top end of the drive motor (22) is fixedly connected to a fixing plate, and the top end of the fixing plate is fixedly connected to a multi-stage electric cylinder (23).

3. The motor volute assembly machine according to claim 2, characterized in that: The outer end of the multi-stage electric cylinder (23) is fixedly connected to a frame (24), the outer end of the frame (24) is slidably connected to a guide slide (25), the top end of the guide slide (25) is fixedly connected to a secondary cylinder body of the multi-stage electric cylinder (23), the top end of the fixed plate is fixedly connected to a plurality of guide rods, and the plurality of guide rods are all slidably connected to the guide slide (25).

4. The motor volute assembly machine according to claim 3, characterized in that: The bottom end of the frame (24) is fixedly connected to a positioning plate (26), the top end of the positioning plate (26) is fixedly connected to a motor (27), the top end of the motor (27) is fixedly connected to the volute (8), and the outlet end of the volute (8) is fixedly connected to an end cover.

5. The motor volute assembly machine according to claim 1, characterized in that: The magnetorheological fluid chamber (9) is filled with magnetorheological fluid, the base fluid of the magnetorheological fluid is polyalphaolefin (PAO), the particle size of the magnetic particles ranges from 1 micron to 5 microns, and an annular cavity (28) is provided inside the fluid rotor (14).

6. The motor volute assembly machine according to claim 1, characterized in that: A cooling channel is provided inside the fluid rotor (14), the cooling channel is communicated with the annular cavity (28), a first annular groove (29) is provided on the inner wall of the fluid rotor (14), a second annular groove (30) is provided on the inner wall of the fluid rotor (14), a through hole is provided on the fluid stator (1) at a position corresponding to the first annular groove (29), a flow channel is provided at the center of the fluid stator (1), the first annular groove (29) is communicated with the flow channel, the flow channel is communicated with a water inlet pipe, a return channel is provided on the fluid stator (1) at a position corresponding to the second annular groove (30), and the return channel is communicated with an external return pipe.

7. The motor volute assembly machine according to claim 1, characterized in that: A first cooling channel and a second cooling channel are provided inside the cantilever (15); the end of the first cooling channel is connected to the annular winding frame (16) via a pipeline; the end of the second cooling channel is connected to the detection winding frame (18); the first cooling channel is connected to the annular cavity (28); and the second cooling channel is connected to the second annular groove (30) via a pipeline.

8. The motor volute assembly machine according to claim 1, characterized in that: The detection coil (19) adopts a differential design, comprising a pair of coaxially arranged primary coils and secondary coils, the turns ratio of the primary coils and the secondary coils is 1:1 to 1:3, the pulse frequency of the detection coil (19) is 10 kHz to 1 MHz, and the material of the detection coil (19) is an ultra-fine enameled wire with a wire diameter of less than 0.1 mm.

9. A motor volute assembly method, applied to a motor volute assembly machine as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1, centering clamping; After the assembly machine is installed, the volute (8) is fed into the assembly machine manually or by equipment, and the control system drives the plurality of sets of electromagnetic expansion components to clamp the volute (8), and the motor (27) is mounted on the positioning plate (26), and the motor is positioned and clamped so that the center of the volute (8) is aligned with the center of the motor (27); S2, induction heating; When the volute (8) is centered and clamped, the control system starts the drive motor (22), the drive motor (22) drives the gear ring (21) to rotate, the gear ring (21) drives the fluid rotor (14) to rotate, and at the same time controls the induction heating coil (17) to heat the assembly area of ​​the volute (8); S3, assembly docking; While rotating and heating the assembly area of ​​the volute (8), the control system drives the multi-stage electric cylinder (23) to drive the expansion assembly and the volute (8) to move downward, and at the same time, the induction heating coil (17) induction heats the clamping part of the motor (27), and at the same time, the multi-stage electric cylinder (23) applies pressure to clamp the volute (8) and the motor (27), thereby pressing the sealing ring in the volute (8); S4, circulating cooling; S5, laser welding; S6. Weld inspection; S7. Stress test.

Images