Powder coating tool for inner wall of stator shell of starter generator
By integrating air and liquid chamber systems into the coating fixture for the stator housing of the starter generator, the problems of powder penetration and fixture overheating were solved, achieving high-quality coating results and an efficient production process.
Patent Information
- Application Number
- CN202520388599.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-06
AI Technical Summary
Traditional starter generator stator housing coating fixtures suffer from powder penetration leading to decreased appearance quality and fixture overheating causing adhesion problems during the coating process, affecting coating uniformity and adhesion.
A coating fixture comprising a lower cover assembly, a mandrel assembly, and an upper cover assembly was designed. By setting up air chambers and liquid chambers, and utilizing a high-pressure gas and coolant circulation system, powder penetration is prevented and the fixture temperature is kept stable, ensuring the accuracy of the coating area and the heat dissipation of the fixture.
It effectively prevents powder penetration, improves coating quality, extends tooling life, reduces cleaning and maintenance costs, and increases coating yield and efficiency.
Smart Images
Figure CN223899096U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of starter generator manufacturing technology, and in particular relates to a powder coating tool for the inner wall of the stator housing of a starter generator. Background Technology
[0002] In the manufacturing process of starter generator stator housings, powder coating is a crucial step that directly affects the product's appearance, corrosion resistance, and overall performance. Traditional coating fixture designs follow the basic principle: the stator housing workpiece to be coated is precisely placed within the fixture, which is designed to shield the non-coating areas of the housing, exposing only the areas requiring coating for uniform powder coating adhesion. This design aims to ensure the accuracy and efficiency of the coating process.
[0003] However, in practice, traditional coating fixtures face two major technical challenges. First, to facilitate quick installation and removal of the workpiece, a certain clearance is inevitably left between the fixture and the stator housing. These tiny gaps become channels for powder penetration during the coating process, causing accidental powder contamination in non-coated areas, severely affecting the product's appearance quality and increasing the difficulty and cost of subsequent cleaning.
[0004] Secondly, the stator housing typically requires preheating to a certain high temperature before coating to promote good adhesion of the powder coating. In continuous production line operations, as workpieces continuously enter the coating area, their accumulated heat is transferred to the tooling. Because traditional tooling lacks an effective heat dissipation mechanism, the internal temperature of the tooling gradually rises, causing some powder to prematurely solidify or adhere upon contact with the tooling surface. This not only affects the uniformity and adhesion of the coating but may also lead to contamination of the tooling itself, further reducing the coating yield. Utility Model Content
[0005] To address the aforementioned problems in the prior art, this utility model aims to provide a powder coating fixture for the inner wall of a starter generator stator housing, which solves the problems of accidental powder contamination in non-spraying areas and premature curing or adhesion of some powder when in contact with the fixture surface, resulting in poor coating.
[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a powder coating fixture for the inner wall of a starter generator stator housing is provided, comprising a lower cover assembly and a mounting plate arranged vertically at intervals, with multiple guide rods arranged between the lower cover assembly and the mounting plate; a cylinder is provided on the mounting plate, with the piston rod of the cylinder arranged vertically and a spindle assembly and an upper cover assembly connected thereto;
[0007] The lower cover assembly includes a guide seat, which has a cylindrical structure. The top of the guide seat has a first circular mounting groove for engaging with the lower end face of the starter generator stator housing. A lower stop plate is provided within the first circular mounting groove. Two bases are symmetrically arranged on the outer circumference of the guide seat. The outer circumference of the guide seat contains independent first air chambers and first liquid chambers, each with a circular cavity structure. The bottom of the first circular mounting groove has multiple first air outlets communicating with the first air chambers. The outer circumference of the guide seat has an air source connection seat and a liquid connection seat. The air source connection seat has a first air inlet channel communicating with the first air chamber and connected to an external compressed air source. The liquid connection seat has a first liquid inlet channel and a first liquid outlet channel communicating with the first liquid chamber and connected to an external coolant source.
[0008] The mandrel assembly is used to blow away excess powder from the inner wall and top of the pole shoe and to cool itself.
[0009] The cylinder drives the upper cover assembly to press and fix the top of the starter generator stator housing. The upper cover assembly blows away the powder on the upper end face and upper stop of the starter generator stator housing and cools itself.
[0010] The powder coating process for the starter generator stator housing ensures that there is no powder adhering to the upper and lower stops, upper and lower end faces, and the inner walls of the four pole shoes, while the remaining inner walls are coated with powder. The processing conditions involve preheating the starter generator stator housing to approximately 200°C, placing it in a spraying fixture, and spraying the powder. The powder melts upon contact with the inner walls and adheres to them, thus completing the powder coating of the starter generator stator housing's inner walls.
[0011] The working principle of the powder coating fixture for the inner wall of the starter generator stator housing in this utility model is as follows: First, both the external compressed air source and the external coolant source are connected to the lower cover assembly, the spindle assembly, and the upper cover assembly. Then, the preheated starter generator stator housing is placed into the first circular mounting groove, so that the lower stop at the bottom of the starter generator stator housing mates with the lower stop mating plate in the first circular mounting groove to fix the bottom of the starter generator stator housing. Next, the cylinder is activated, and the piston rod of the cylinder drives the spindle assembly and the upper cover assembly to be positioned on the inner wall of the pole shoe and the top of the starter generator stator housing respectively, pressing and fixing them. The lower cover assembly, mandrel assembly, and upper cover assembly are ventilated and circulated with liquid. Simultaneously, the drive device places the entire fixture, which holds the starter generator stator housing, into the powder hopper. The ventilated lower and upper cover assemblies blow away the powder from the upper and lower stops and end faces of the generator stator housing, respectively. The ventilated mandrel assembly blows away the powder from the inner wall and top of the pole shoes, meeting the technical requirements of the starter generator stator housing powder coating process. After coating, the coating fixture leaves the powder hopper, the piston rod of the cylinder retracts, and the mandrel assembly and upper cover assembly move upwards to remove the starter generator stator housing, thus completing the powder coating process. Throughout the entire powder coating process, an external coolant source circulates within the lower cover assembly, mandrel assembly, and upper cover assembly, carrying away the heat transferred from the starter generator stator housing to the fixture, preventing powder adhesion problems caused by overheating of the fixture.
[0012] Furthermore, as a specific arrangement of the upper cover assembly, the upper cover assembly includes an upper guide plate, the middle part of which is fixedly connected to the spindle assembly. The two sides of the upper guide plate are slidably engaged with the guide rod via sleeves. A connecting cylinder is fixedly connected to the lower end face of the upper guide plate. The spindle assembly is located inside the connecting cylinder. An upper fixed seat is connected to the bottom of the connecting cylinder. The upper fixed seat has a circular cylindrical structure. A second circular mounting groove for engaging with the upper end face of the starter generator stator housing is provided at the bottom of the upper fixed seat. An upper stop plate is provided within the second circular mounting groove. A second air chamber and a second liquid chamber, each with an independent annular cavity structure, are provided within the circumferential wall of the upper fixed seat. Multiple second air outlets communicating with the second air chambers are provided at the bottom of the second circular mounting groove. A second air inlet channel communicating with the second air chamber is provided within the wall of the connecting cylinder, and the second air inlet channel is connected to an external compressed air source. A second liquid inlet channel and a second liquid outlet channel communicating with the second liquid chamber are provided within the wall of the connecting cylinder, and the second liquid inlet channel and the second liquid outlet channel are connected to an external coolant source.
[0013] The basic principle of the top cover assembly is as follows: When it is necessary to press and fix the starter generator stator housing, the cylinder piston rod moves downward, driving the connecting cylinder and the upper fixed seat on it to move downward until the second circular mounting groove mates with and presses against the upper end face of the starter generator stator housing. Then, the cylinder piston rod stops, the second air intake channel is opened, and external compressed air enters the second air chamber through the second air intake channel. The compressed gas in the second air chamber is ejected through the second air outlet, with the gas ejection direction directed towards the upper end face and upper stop of the starter generator stator housing, blowing away powder from the upper end face and upper stop of the starter generator stator housing. The second liquid inlet channel is circulated, and external coolant enters the second liquid chamber through the second liquid inlet channel and flows out through the second liquid outlet channel. The coolant circulates repeatedly between the second liquid inlet channel, the second liquid chamber, and the second liquid outlet channel, cooling the connecting cylinder and the upper fixed seat and preventing the entire top cover assembly from overheating.
[0014] Furthermore, the connecting cylinder has a hollowed-out center to reduce its weight and ensure that the cylinder piston rod can smoothly drive the connecting cylinder to reciprocate vertically.
[0015] Furthermore, as a specific arrangement of the mandrel assembly, the mandrel assembly includes a vertically arranged central shaft located inside the connecting cylinder, the top of the central shaft being fixedly connected to the piston rod of the cylinder, and a flange connected to the upper end face of the upper guide plate being provided in the upper middle part of the central shaft;
[0016] A lower fixed seat is provided at the bottom of the central shaft, and a middle fixed seat is provided at the lower middle part of the central shaft. The cylinder piston rod drives the central shaft so that the lower fixed seat and the middle fixed seat are located inside and at the top of the pole shoe, respectively.
[0017] The lower fixed base is provided with a third liquid chamber and a third gas chamber, both of which are circular cavity structures. The third liquid chamber is located inside the third gas chamber. The central shaft is provided with a third liquid inlet channel, a third liquid outlet channel, and a third air inlet channel. One end of the third liquid inlet channel and the third liquid outlet channel are connected to the third liquid chamber, and the other end is connected to an external coolant source. One end of the third air inlet channel is connected to the third gas chamber, and the other end is connected to an external compressed air source. Multiple third air outlet holes are provided on the side wall of the third gas chamber.
[0018] The middle fixed base has a fourth air chamber with a ring structure inside. The lower end face of the middle fixed base is provided with multiple air outlet pipes that communicate with the fourth air chamber. The bottom of each air outlet pipe is located in the gap between the stator housing of the starter generator and the pole shoe. The top of the middle fixed base is provided with a fourth air inlet channel that communicates with the fourth air chamber. The fourth air inlet channel is used to connect to an external compressed air source.
[0019] The basic principle of the mandrel assembly is as follows: After the cylinder piston rod drives the upper cover assembly to press and fix the upper end face of the starter generator stator housing, the lower fixed seat and the middle fixed seat are located inside and on top of the pole shoes, respectively. An external compressed air source delivers high-pressure gas to the third air chamber through the third air intake channel. The high-pressure gas is ejected through multiple third air outlets, blowing away the powder on the inner wall of the pole shoes. An external compressed air source delivers high-pressure gas to the fourth air chamber through the fourth air intake channel. The high-pressure gas is ejected through multiple air outlet pipes, blowing away the powder on the top of the pole shoes, thus meeting the powder coating technical requirements of no powder adhering to the inner wall and top of the four pole shoes. During cooling, an external coolant source delivers coolant through the third coolant inlet channel, and the coolant flows out through the third coolant outlet channel, achieving cooling of the entire lower fixed seat and the central shaft, preventing the entire mandrel assembly from overheating.
[0020] Furthermore, as a specific arrangement of the lower fixed seat, the lower fixed seat includes a first enclosure plate and a second enclosure plate. The first enclosure plate is fixedly connected to the outer wall of the central shaft, and the space between the first enclosure plate and the central shaft is the third liquid cavity. The second enclosure plate is fixedly connected to the circumferential outer wall of the first enclosure plate, and the space between the second enclosure plate and the first enclosure plate is the third air cavity. A plurality of third air outlets are provided on the circumferential outer wall of the second enclosure plate.
[0021] Furthermore, each of the pole shoes is provided with multiple third air vents in the area projected onto the circumferential outer wall of the second enclosure in a side view. This arrangement ensures that the high-pressure gas blown through the multiple third air vents removes the powder on the inner wall of each pole shoe.
[0022] Furthermore, there are four exhaust pipes, which are evenly spaced in a ring along the axial direction of the central axis. In this invention, four pole shoes are evenly arranged in a ring on the inner wall of the stator housing of the starter generator, with each exhaust pipe corresponding to one pole shoe. This ensures that the high-pressure gas blown by the exhaust pipes blows away excess powder from the top of each pole shoe, preventing powder accumulation.
[0023] Furthermore, the inner walls of the inlet sections of the first air inlet channel, the first liquid inlet channel, the first liquid outlet channel, the second air inlet channel, the second liquid inlet channel, the second liquid outlet channel, the third liquid inlet channel, the third liquid outlet channel, and the third air inlet channel are all provided with internal threads. The internal threads facilitate the connection of the pipes.
[0024] Furthermore, there are two guide rods, with the top ends of the two guide rods fixedly connected to both sides of the mounting plate, and the bottom ends of the two guide rods fixedly connected to the bases on both sides of the guide seat.
[0025] Furthermore, the diameters of the first, second, and third vent holes are all 1mm to 2mm; multiple first vent holes are evenly spaced circumferentially at the bottom of the first circular mounting groove; multiple second vent holes are evenly spaced circumferentially at the bottom of the second circular mounting groove. By controlling the size and distribution of the vent holes, a barrier is formed by the high-pressure gas, effectively preventing powder particles from entering the upper and lower stops, upper and lower end faces, and inner walls of the four pole shoes of the generator stator housing.
[0026] Compared with existing stator housing inner wall powder coating tooling, the advantages of this utility model are as follows:
[0027] 1. This utility model discloses a powder coating fixture for the inner wall of a starter generator stator housing. By incorporating multiple air chambers within the fixture and connecting them to air outlets, the high-pressure gas ejected from these outlets forms a barrier, effectively preventing powder particles from entering non-coating areas. This ensures that the upper and lower stops, upper and lower end faces, and the inner walls of the four pole shoes of the generator stator housing are free of powder adhesion, meeting the technical requirements of the powder coating process for the starter generator stator housing. The coating fixture not only ensures the precision of the coating area but also significantly reduces appearance defects caused by powder contamination, lowers subsequent cleaning costs, and improves the overall coating quality.
[0028] 2. This utility model discloses a powder coating fixture for the inner wall of a starter generator stator housing. By incorporating multiple liquid chambers within the fixture, each connected to an external coolant source via inlet and outlet channels, effective heat dissipation is achieved. During the heating and coating process on the stator housing, the coolant continuously circulates, carrying away the heat absorbed by the fixture, effectively maintaining a stable fixture temperature and preventing powder adhesion caused by overheating. This not only ensures the uniformity and adhesion of the coating but also extends the service life of the fixture and reduces downtime maintenance and replacement costs due to fixture contamination.
[0029] 3. The powder coating fixture for the inner wall of the stator housing of the starter generator in this utility model innovatively integrates an air blowing system and a coolant circulation system, which effectively solves the two major problems of powder penetration and fixture overheating, and significantly improves the yield and efficiency of the coating operation. Attached Figure Description
[0030] Figure 1 This is a three-dimensional structural schematic diagram of a tooling for powder coating on the inner wall of a starter generator stator housing.
[0031] Figure 2 This is a three-dimensional structural diagram of the lower cover assembly.
[0032] Figure 3 This is a top view of the lower cover assembly.
[0033] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure along the AA direction.
[0034] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure in the middle BB direction.
[0035] Figure 6 Schematic diagram of the three-dimensional structure of the upper cover component Figure 1 .
[0036] Figure 7 Schematic diagram of the three-dimensional structure of the upper cover component Figure 2 .
[0037] Figure 8 This is a top view of the top cover assembly.
[0038] Figure 9 for Figure 8 A schematic diagram of the cross-sectional structure along the CC direction.
[0039] Figure 10 for Figure 8 A schematic diagram of the cross-sectional structure along the DD direction.
[0040] Figure 11 This is a three-dimensional structural diagram of the mandrel assembly.
[0041] Figure 12 This is a top view of the mandrel assembly.
[0042] Figure 13 for Figure 12 A schematic diagram of the cross-sectional structure along the EE direction.
[0043] Figure 14 for Figure 12 A schematic diagram of the cross-sectional structure along the FF direction.
[0044] Figure 15 for Figure 12 Schematic diagram of the cross-sectional structure in the GG direction.
[0045] The components include: 1. base; 2. mounting plate; 3. guide rod;
[0046] 4. Lower cover assembly; 41. Guide seat; 42. First circular mounting groove; 43. Lower stop plate; 45. First air chamber; 46. First liquid chamber; 47. First air outlet; 48. Air source connection seat; 49. Liquid connection seat; 410. First air inlet channel; 412. First liquid inlet channel; 413. First liquid outlet channel;
[0047] 5. Cylinder;
[0048] 6. Mandrel assembly; 61. Central shaft; 62. Flange; 63. Lower fixed seat; 631. First surrounding plate; 632. Second surrounding plate; 64. Middle fixed seat; 65. Third liquid chamber; 66. Third gas chamber; 67. Third liquid inlet channel; 68. Third liquid outlet channel; 69. Third air inlet channel; 610. Third air outlet; 612. Fourth gas chamber; 613. Air outlet pipe; 614. Fourth air inlet channel;
[0049] 7. Top cover assembly; 71. Upper guide plate; 72. Connecting cylinder; 73. Upper fixed base; 74. Second circular mounting groove; 75. Upper stop plate; 76. Second air chamber; 77. Second liquid chamber; 78. Second air outlet; 79. Second air inlet channel; 710. Second liquid inlet channel; 711. Second liquid outlet channel;
[0050] 8. Start the generator stator housing; 9. Pole shoes. Detailed Implementation
[0051] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.
[0052] like Figures 1-5 As shown, this utility model provides a powder coating fixture for the inner wall of a starter generator stator housing, which includes a lower cover assembly 4 and a mounting plate 2 arranged vertically at intervals. Multiple guide rods 3 are arranged between the lower cover assembly 4 and the mounting plate 2. Specifically, there are two guide rods 3. The top ends of the two guide rods 3 are fixedly connected to the two sides of the mounting plate 2, and the bottom ends of the two guide rods 3 are fixedly connected to the base 1 on both sides of the guide seat 41.
[0053] A cylinder 5 is mounted on the mounting plate 2. The piston rod of the cylinder 5 is vertically arranged and connected to a spindle assembly 6 and an upper cover assembly 7. Specifically, the lower cover assembly 4 includes a guide seat 41, which has a cylindrical structure. The top of the guide seat 41 is provided with a first circular mounting groove 42 for engaging with the lower end face of the stator housing 8 of the starter generator. A lower stop plate 43 is provided inside the first circular mounting groove 42. The circumferential wall of the guide seat 41 is provided with a first air chamber 45 and a first liquid chamber 46, which are independent of each other and each has a circular cavity structure. The bottom of the mounting groove is provided with a plurality of first air outlets 47 communicating with the first air chamber 45. The outer circumferential wall of the guide seat 41 is provided with an air source connection seat 48 and a liquid connection seat 49. The air source connection seat 48 is provided with a first air inlet channel 410 communicating with the first air chamber 45, and the first air inlet channel 410 is connected to an external compressed air source. The liquid connection seat 49 is provided with a first liquid inlet channel 412 and a first liquid outlet channel 413 communicating with the first liquid chamber 46, and the first liquid inlet channel and the first liquid outlet channel 413 are connected to an external coolant source.
[0054] The mandrel assembly 6 is used to blow away excess powder from the inner wall and top of the pole shoe 9 and to cool itself.
[0055] The cylinder 5 drives the upper cover assembly 7 to press and fix the top of the starter generator stator housing 8. The upper cover assembly 7 blows away the powder on the upper end face and upper stop of the starter generator stator housing 8 and cools itself.
[0056] The powder coating process for the starter generator stator housing 8 ensures that there is no powder adhering to the upper and lower stops, upper and lower end faces, and the inner walls of the four pole shoes 9, while the remaining inner walls are coated with powder. The processing conditions involve preheating the starter generator stator housing 8 to approximately 200°C, placing it in a spraying fixture, and spraying the powder. The powder melts upon contact with the inner walls and adheres to them, thus completing the powder coating of the inner walls of the starter generator stator housing 8.
[0057] The working principle of the powder coating fixture for the inner wall of the starter generator stator housing in this utility model is as follows: First, both the external compressed air source and the external coolant source are connected to the lower cover assembly 4, the spindle assembly 6, and the upper cover assembly 7. Then, the preheated starter generator stator housing 8 is placed into the first circular mounting groove 42, so that the lower stop at the bottom of the starter generator stator housing 8 mates with the lower stop mating plate 43 in the first circular mounting groove 42, thereby fixing the bottom of the starter generator stator housing 8. Next, the cylinder 5 is activated, and the piston rod of the cylinder 5 drives the spindle assembly 6 and the upper cover assembly 7 to be positioned on the inner wall of the pole shoe 9 and pressed to fix the starter generator stator housing 8. After the top is reached, the lower cover assembly 4, mandrel assembly 6, and upper cover assembly 7 are ventilated and ventilated. Simultaneously, the drive device places the entire fixture, which holds the starter generator stator housing 8, into the powder hopper. The ventilated lower cover assembly 4 and upper cover assembly 7 blow away the powder from the upper and lower stops and end faces of the generator stator housing, respectively. The ventilated mandrel assembly 6 blows away the powder from the inner wall and top of the pole shoe 9, thus meeting the technical requirements of the powder coating process for the starter generator stator housing 8. After coating, the coating fixture leaves the powder hopper, the piston rod of cylinder 5 retracts, and the mandrel assembly 6 and upper cover assembly 7 move upwards to remove the starter generator stator housing 8, completing the powder coating process. Throughout the entire powder coating process, an external coolant source circulates within the lower cover assembly 4, mandrel assembly 6, and upper cover assembly 7, carrying away the heat transferred from the starter generator stator housing 8 to the fixture, thus preventing powder adhesion problems caused by overheating of the fixture.
[0058] Specifically, such as Figure 1 , Figures 6-10 As shown, in one specific configuration of the upper cover assembly 7, the upper cover assembly 7 includes an upper guide plate 71. The middle part of the upper guide plate 71 is fixedly connected to the spindle assembly 6. The two sides of the upper guide plate 71 are slidably engaged with the guide rod 3 through sleeves. A connecting cylinder 72 is fixedly connected to the lower end face of the upper guide plate 71. The spindle assembly 6 is located inside the connecting cylinder 72. An upper fixing seat 73 is connected to the bottom of the connecting cylinder 72. The upper fixing seat 73 has a circular cylindrical structure. The bottom of the upper fixing seat 73 is provided with a second circular mounting groove 74 for engaging with the upper end face of the stator housing 8 of the starter generator. The second circular mounting groove 74 contains... The upper stop plate 75 is provided; the circumferential wall of the upper fixed seat 73 is provided with a second air chamber 76 and a second liquid chamber 77 that are independent of each other and are both circular cavity structures; the bottom of the second circular mounting groove 74 is provided with a plurality of second air outlet holes 78 that communicate with the second air chamber 76; the wall of the connecting cylinder 72 is provided with a second air inlet channel 79 that communicates with the second air chamber 76 and is connected to an external compressed air source; the wall of the connecting cylinder 72 is provided with a second liquid inlet channel 710 and a second liquid outlet channel 711 that communicate with the second liquid chamber 77 and are connected to an external coolant source.
[0059] The basic principle of the upper cover assembly 7 is as follows: When it is necessary to press and fix the starter generator stator housing 8, the cylinder piston rod moves downward, driving the connecting cylinder 72 and the upper fixed seat 73 on it to move downward until the second circular mounting groove 74 mates with and presses against the upper end face of the starter generator stator housing 8. Then the cylinder piston rod stops, the second air intake channel 79 is ventilated, and the external compressed air source enters the second air chamber 76 through the second air intake channel 79. The compressed gas in the second air chamber 76 is ejected through the second air outlet 78, and the gas ejection direction of the second air outlet 78 is towards the upper end face and the upper stop of the starter generator stator housing 8, blowing away the powder on the upper end face and the upper stop of the starter generator stator housing 8. The second liquid inlet channel 710 is filled with liquid, and the external coolant enters the second liquid chamber 77 through the second liquid inlet channel 710 and flows out through the second liquid outlet channel 711. The coolant circulates back and forth between the second liquid inlet channel 710, the second liquid chamber 77 and the second liquid outlet channel 711 to cool the connecting cylinder 72 and the upper fixed seat 73, thereby preventing the entire upper cover assembly 7 from overheating.
[0060] Preferably, but not limited to, the connecting cylinder 72 is hollowed out in the middle to reduce the weight of the connecting cylinder 72 and ensure that the cylinder piston rod can smoothly drive the connecting cylinder 72 to reciprocate vertically.
[0061] Specifically, such as Figure 1 , Figures 10-15 As shown, as a specific arrangement of the mandrel assembly 6, the mandrel assembly 6 includes a vertically arranged central shaft 61 located inside the connecting cylinder 72. The top of the central shaft 61 is fixedly connected to the piston rod of the cylinder 5, and a flange 62 connected to the upper end face of the upper guide plate 71 is provided on the upper middle part of the central shaft 61.
[0062] A lower fixed seat 63 is provided at the bottom of the central shaft 61, and a middle fixed seat 64 is provided at the lower middle part of the central shaft 61. The cylinder piston rod drives the central shaft 61 so that the lower fixed seat 63 and the middle fixed seat 64 are located inside and at the top of the pole shoe 9, respectively.
[0063] The lower fixed base 63 is provided with a third liquid chamber 65 and a third air chamber 66, both of which are circular cavity structures. The third liquid chamber 65 is located inside the third air chamber 66. The central shaft 61 is provided with a third liquid inlet channel 67, a third liquid outlet channel 68 and a third air inlet channel 69. One end of the third liquid inlet channel 67 and the third liquid outlet channel 68 are connected to the third liquid chamber 65, and the other end is connected to an external coolant source. One end of the third air inlet channel 69 is connected to the third air chamber 66, and the other end is connected to an external compressed air source. The side wall of the third air chamber 66 is provided with a plurality of third air outlet holes 610.
[0064] The middle fixed base 64 has a fourth air chamber 612 with an annular structure inside. The lower end face of the middle fixed base 64 is provided with multiple air outlet pipes 613 that communicate with the fourth air chamber 612. The bottom of each air outlet pipe 613 is located in the gap between the stator housing 8 and the pole shoe 9 of the starter generator. The top of the middle fixed base 64 is provided with a fourth air inlet channel 614 that communicates with the fourth air chamber 612. The fourth air inlet channel 614 is used to connect to an external compressed air source.
[0065] The basic principle of the mandrel assembly 6 is as follows: After the cylinder piston rod drives the upper cover assembly 7 to press and fix the upper end face of the starter generator stator housing 8, the lower fixed seat 63 and the middle fixed seat 64 are located inside and on top of the pole shoes 9, respectively. An external compressed air source delivers high-pressure gas to the third air chamber 66 through the third air intake channel 69. The high-pressure gas is ejected through multiple third air outlets 610, blowing away the powder on the inner wall of the pole shoes 9. An external compressed air source delivers high-pressure gas to the fourth air chamber 612 through the fourth air intake channel 614. The high-pressure gas is ejected through multiple air outlet pipes 613, blowing away the powder on the top of the pole shoes 9, thus meeting the powder coating technical requirement that there is no powder adhering to the inner wall and top of the four pole shoes 9. During cooling, an external coolant source delivers coolant through the third coolant inlet channel 67, and the coolant flows out through the third coolant outlet channel 68, thereby cooling the entire lower fixed seat 63 and the central shaft 61 and preventing the entire mandrel assembly 6 from overheating.
[0066] Preferably, as a specific arrangement of the lower fixing seat 63, the lower fixing seat 63 includes a first surrounding plate 631 and a second surrounding plate 632. The first surrounding plate 631 is fixedly connected to the outer wall of the central shaft 61, and the space between the first surrounding plate 631 and the central shaft 61 forms the third liquid cavity 65. The second surrounding plate 632 is fixedly connected to the circumferential outer wall of the first surrounding plate 631, and the space between the second surrounding plate 632 and the first surrounding plate 631 is the third air cavity 66. A plurality of third air outlets 610 are provided on the circumferential outer wall of the second surrounding plate 632.
[0067] Preferably, but not limited to, each of the pole shoes 9 is provided with a plurality of the third vent holes 610 in the area projected in the side view direction of the outer circumferential wall of the second enclosure plate 632. This arrangement ensures that the high-pressure gas blown through the plurality of third vent holes 610 blows away the powder on the inner wall of each pole shoe 9.
[0068] In this embodiment, there are four exhaust pipes 613, which are evenly spaced in a ring around the central axis 61. In this invention, four pole shoes 9 are evenly arranged in a ring around the inner wall of the starter generator stator housing 8. Each exhaust pipe 613 corresponds to one pole shoe 9, ensuring that the high-pressure gas blown by the exhaust pipes 613 blows away excess powder from the top of each pole shoe 9, preventing powder accumulation.
[0069] Specifically, the inner walls of the inlet sections of the first air inlet channel 410, the first liquid inlet channel 412, the first liquid outlet channel 413, the second air inlet channel 79, the second liquid inlet channel 710, the second liquid outlet channel 711, the third liquid inlet channel 67, the third liquid outlet channel 68, and the third air inlet channel 69 are all provided with internal threads. The internal threads facilitate the connection of the pipes.
[0070] Furthermore, the diameters of the first vent 47, the second vent 78, and the third vent 610 are all 1mm to 2mm; the plurality of first vents 47 are evenly spaced circumferentially at the bottom of the first circular mounting groove; the plurality of second vents 78 are evenly spaced circumferentially at the bottom of the second circular mounting groove 74. By controlling the size and distribution of the vents, a barrier is formed by the high-pressure gas, effectively preventing powder particles from entering the upper and lower stops, upper and lower end faces, and inner walls of the four pole shoes 9 of the generator stator housing.
[0071] In summary, the powder coating fixture for the inner wall of the stator housing of the starter generator of this utility model innovatively integrates an air blowing system and a coolant circulation system, effectively solving the two major problems of powder penetration and tooling overheating. It significantly improves the yield and efficiency of coating operations, reduces production costs, and enhances the competitiveness of the entire starter generator manufacturing industry, which is of great significance to improving the competitiveness of the entire starter generator manufacturing industry.
Claims
1. A powder coating fixture for the inner wall of a starter generator stator housing, characterized in that, It includes a lower cover assembly and a mounting plate arranged vertically at intervals, with multiple guide rods arranged between the lower cover assembly and the mounting plate; a cylinder is provided on the mounting plate, and the piston rod of the cylinder is arranged vertically and connected to a spindle assembly and an upper cover assembly; The lower cover assembly includes a guide seat, which has a cylindrical structure. The top of the guide seat has a first circular mounting groove for engaging with the lower end face of the starter generator stator housing. A lower stop plate is provided within the first circular mounting groove. Two bases are symmetrically arranged on the outer circumference of the guide seat. The outer circumference of the guide seat contains independent first air chambers and first liquid chambers, each with a circular cavity structure. The bottom of the first circular mounting groove has multiple first air outlets communicating with the first air chambers. The outer circumference of the guide seat has an air source connection seat and a liquid connection seat. The air source connection seat has a first air inlet channel communicating with the first air chamber and connected to an external compressed air source. The liquid connection seat has a first liquid inlet channel and a first liquid outlet channel communicating with the first liquid chamber and connected to an external coolant source. The mandrel assembly is used to blow away excess powder from the inner wall and top of the pole shoe and to cool itself. The cylinder drives the upper cover assembly to press and fix the top of the starter generator stator housing. The upper cover assembly blows away the powder on the upper end face and upper stop of the starter generator stator housing and cools itself.
2. The powder coating fixture for the inner wall of the stator housing of the starter generator according to claim 1, characterized in that, The upper cover assembly includes an upper guide plate, the middle of which is fixedly connected to the spindle assembly. The two sides of the upper guide plate are slidably engaged with the guide rod via sleeves. A connecting cylinder is fixedly connected to the lower end face of the upper guide plate. The spindle assembly is located inside the connecting cylinder. An upper fixed seat is connected to the bottom of the connecting cylinder. The upper fixed seat has a cylindrical structure. A second circular mounting groove is provided at the bottom of the upper fixed seat for engaging with the upper end face of the starter generator stator housing. An upper stop plate is provided within the second circular mounting groove. The circumferential wall of the upper fixed seat contains independent second air chambers and second liquid chambers, each with an annular cavity structure. The bottom of the second circular mounting groove has multiple second air outlets communicating with the second air chambers. A second air inlet channel communicating with the second air chambers is provided within the wall of the connecting cylinder, and the second air inlet channel is connected to an external compressed air source. A second liquid inlet channel and a second liquid outlet channel communicating with the second liquid chambers are provided within the wall of the connecting cylinder, and the second liquid inlet channel and the second liquid outlet channel are connected to an external coolant source.
3. The powder coating fixture for the inner wall of the stator housing of the starter generator according to claim 2, characterized in that, The connecting cylinder has a hollowed-out center.
4. The powder coating fixture for the inner wall of the stator housing of the starter generator according to claim 2, characterized in that, The mandrel assembly includes a vertically arranged central shaft located inside the connecting cylinder. The top of the central shaft is fixedly connected to the piston rod of the cylinder, and a flange connected to the upper end face of the upper guide plate is provided on the upper middle part of the central shaft. A lower fixed seat is provided at the bottom of the central shaft, and a middle fixed seat is provided at the lower middle part of the central shaft. The cylinder piston rod drives the central shaft so that the lower fixed seat and the middle fixed seat are located inside and at the top of the pole shoe, respectively. The lower fixed base is provided with a third liquid chamber and a third gas chamber, both of which are circular cavity structures. The third liquid chamber is located inside the third gas chamber. The central shaft is provided with a third liquid inlet channel, a third liquid outlet channel, and a third air inlet channel. One end of the third liquid inlet channel and the third liquid outlet channel are connected to the third liquid chamber, and the other end is connected to an external coolant source. One end of the third air inlet channel is connected to the third gas chamber, and the other end is connected to an external compressed air source. Multiple third air outlet holes are provided on the side wall of the third gas chamber. The middle fixed base has a fourth air chamber with a ring structure inside. The lower end face of the middle fixed base is provided with multiple air outlet pipes that communicate with the fourth air chamber. The bottom of each air outlet pipe is located in the gap between the stator housing of the starter generator and the pole shoe. The top of the middle fixed base is provided with a fourth air inlet channel that communicates with the fourth air chamber. The fourth air inlet channel is used to connect to an external compressed air source.
5. The powder coating fixture for the inner wall of the stator housing of the starter generator according to claim 4, characterized in that, The lower fixed base includes a first enclosure plate and a second enclosure plate. The first enclosure plate is fixedly connected to the outer wall of the central shaft, and the space between the first enclosure plate and the central shaft is the third liquid cavity. The second enclosure plate is fixedly connected to the circumferential outer wall of the first enclosure plate, and the space between the second enclosure plate and the first enclosure plate is the third air cavity. A plurality of third air outlets are provided on the circumferential outer wall of the second enclosure plate.
6. The powder coating fixture for the inner wall of the stator housing of the starter generator according to claim 5, characterized in that, Each of the pole shoes is provided with a plurality of the third air vents in the area projected in the side view direction of the outer circumference of the second enclosure.
7. The powder coating fixture for the inner wall of the stator housing of the starter generator according to claim 4, characterized in that, The number of air outlet pipes is 4, and the 4 air outlet pipes are evenly arranged in a ring at intervals along the axial direction of the central axis.
8. The powder coating fixture for the inner wall of the stator housing of a starter generator according to any one of claims 4 to 7, characterized in that, The inner walls of the inlet sections of the first air inlet channel, the first liquid inlet channel, the first liquid outlet channel, the second air inlet channel, the second liquid inlet channel, the second liquid outlet channel, the third liquid inlet channel, the third liquid outlet channel, and the third air inlet channel are all provided with internal threads.
9. The powder coating fixture for the inner wall of the stator housing of a starter generator according to claim 8, characterized in that, The guide rods are of two types. The top ends of the two guide rods are fixedly connected to both sides of the mounting plate, and the bottom ends of the two guide rods are fixedly connected to the two bases on both sides of the guide seat.
10. The powder coating fixture for the inner wall of the stator housing of the starter generator according to claim 4, characterized in that, The diameters of the first, second, and third air outlets are all 1mm to 2mm; the plurality of first air outlets are evenly arranged circumferentially at intervals at the bottom of the first circular mounting groove; the plurality of second air outlets are evenly arranged circumferentially at intervals at the bottom of the second circular mounting groove.