A portable press tool for motor

Abstract

This invention provides a portable press-fit tool for motors, belonging to the technical field of motor repair equipment. It solves the technical problems of inconvenient motor repair and the inability to perform repairs on-site. The portable press-fit tool has a worktable in the middle of its mounting frame. Guide rods are located at both ends of the worktable, and a screw is screwed into the middle. The lower ends of the guide rods are fixed to a pressure plate. The upper end of the screw has a handle, and its lower end is rotatably connected to the pressure plate. The lower end of the pressure plate has a top block that abuts against a bearing pressure post and drives the bearing downwards through the bearing pressure post. This invention features a simple tool structure, small size, and easy portability. The design of the screw, guide sleeve, and guide rod ensures the stability of the top block during downward movement, improving the press-fit accuracy of the portable press-fit tool. This solves the assembly relationship between the stator assembly, rotor assembly, and bearing, resulting in better dynamic balance of the assembled motor.

Description

Technical Field

[0001] This utility model belongs to the technical field of motor repair equipment, and specifically refers to a portable pressing tool for motors. Background Technology

[0002] External rotor fans are widely used in ventilation, refrigeration and other industries. The motor of an external rotor fan mainly rotates, which generates a lot of centrifugal force and torque. Therefore, there are high requirements for the performance and quality of the bearings in the motor. If the dynamic balance is not up to standard, the motor will generate a lot of vibration, which can easily lead to motor damage. When the motor is damaged, the bearings inside the motor are often the ones that are damaged.

[0003] To ensure that the dynamic balance of the bearings meets the standards after installation, specialized equipment is used to assemble the bearings during production. However, this equipment is generally large and heavy, making it inconvenient to carry and move. When customers' external rotor fans have problems and need repair, especially when bearings, stators, or rotors need to be replaced, it is often impossible to handle the problem on-site. The product needs to be transported back to the company for repair, which results in significant time, transportation, and labor costs.

[0004] Therefore, there is a need to provide a portable press-fitting tool that can resolve the assembly relationship between the stator assembly, rotor assembly, and bearings. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a portable press-fitting tool that can solve the assembly relationship between the stator assembly, rotor assembly and bearing.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A portable pressing tool for an electric motor, characterized in that it includes a positioning plate, a positioning fixture, a mounting frame, and two support frames. The positioning fixture is installed in the middle of the positioning plate. The positioning plate and the mounting frame are arranged parallel to each other. The two support frames are installed between the positioning plate and the mounting frame and are perpendicular to the positioning plate. The lower ends of the two support frames are detachably connected to both ends of the positioning plate, and the upper ends are detachably connected to both ends of the mounting frame. A worktable is provided in the middle of the mounting frame. Guide sleeves perpendicular to the worktable are installed at both ends of the worktable. The sleeve is slidably equipped with guide rods. A pressure plate is provided below the worktable. The lower ends of the two guide rods are fixedly connected to the two ends of the pressure plate, respectively. A threaded hole is provided in the middle of the worktable. The screw passes through the threaded hole and its lower end is rotatably connected to the middle of the pressure plate. A limiting member is provided on the pressure plate to fix the screw axially. A handle for driving the screw to rotate is provided at the upper end of the screw. A top block is provided at the lower end of the pressure plate. The top block is coaxially arranged with the positioning fixture. The top block can abut against the bearing pressure column and drive the bearing to move downward through the bearing pressure column.

[0008] This portable press-fit tool features a simple structure, small size, and easy portability. The positioning plate, positioning fixture, mounting frame, and support frame are all detachable, allowing for easy disassembly during transport and further reducing its size. This facilitates on-site assembly after repairs. The positioning fixture positions the motor rotor assembly, and a screw-driven top block lowers to press the bearing into place. The screw-driven mechanism ensures a slow and stable downward movement of the top block, providing force feedback once the bearing is in place, preventing continued pressure on the bearing and improving the pressing accuracy. The guide sleeve and guide rod design ensure stability during the top block's downward movement, preventing misalignment and further enhancing the pressing accuracy. This ensures that the bearings in the rotor assembly and the bearing housings in the stator assembly are pressed into place with high precision, resolving the assembly relationship between the stator assembly, rotor assembly, and bearings, resulting in better dynamic balance in the assembled motor.

[0009] In the aforementioned portable press-fit tool for an electric motor, during the assembly of the rotor assembly bearing, the bearing pressure post is cylindrical. A bearing positioning fixture, capable of being inserted into the rotor assembly of the motor, is located above the positioning fixture. The bearing positioning fixture includes a positioning disc, an outer positioning ring, and an inner positioning ring arranged coaxially. The positioning disc has a positioning hole in its center. The upper end of the inner positioning ring is fixedly connected to the positioning disc. The inner diameter of the inner positioning ring is equal to the diameter of the positioning hole. The outer diameter of the outer positioning ring is smaller than the diameter of the positioning disc. The outer wall of the outer positioning ring can abut against the inner wall of the rotor assembly. The positioning disc can abut against the upper end of the rotor assembly. The outer diameter of the bearing pressure post is less than or equal to the outer diameter of the bearing, the inner diameter of the bearing pressure post is greater than or equal to the inner diameter of the bearing, and the inner diameter of the inner positioning ring is greater than or equal to the outer diameters of the bearing and the bearing pressure post.

[0010] When the bearing clamp is cylindrical, it is used to press the bearing of the rotor assembly. The bearing positioning fixture can position the bearing to be installed. In conjunction with the motor shaft, it can effectively prevent the bearing from tilting. Then, the bearing clamp is used to press the bearing into the rotor assembly along the shaft. During the entire pressing process, the inner positioning ring of the bearing positioning fixture and the shaft cooperate to keep the bearing in a stable downward state. This ensures that the bearing does not tilt after pressing and avoids wear caused by bearing tilting during the pressing process. It is beneficial to improve the dynamic balance performance of the motor after assembly and realizes the assembly between the bearing and the rotor assembly.

[0011] In the aforementioned portable press-fitting tool for an electric motor, during the assembly of the bearing of the stator assembly, the bearing press column is T-shaped, including a limiting part and a pressing part fixedly connected to the lower end of the limiting part. The diameter of the pressing part is less than or equal to the diameter of the bearing chamber of the motor stator assembly, the diameter of the pressing part is greater than the inner diameter of the bearing, and the diameter of the limiting part is greater than the diameter of the bearing chamber of the motor stator assembly.

[0012] When the bearing press is T-shaped, it is used to press the bearing of the stator assembly. The length of the pressing part can be customized according to the height of the bearing chamber and the thickness of the bearing. When the limiting part abuts against the stator assembly, the pressing part presses the bearing into place, which can effectively prevent the bearing press from continuing to apply pressure to the bearing after it is pressed into place, thus improving the pressing accuracy of this portable pressing tool.

[0013] In the aforementioned portable pressing tool for an electric motor, a connecting pipe is fixedly connected to both ends of the positioning plate. The length direction of the connecting pipe is perpendicular to the length direction of the positioning plate. The connecting pipe is located below the positioning plate and its middle part is fixedly connected to the positioning plate. A foot is fixedly connected to both ends of the connecting pipe, and the lower end of the foot has a disc-shaped contact portion.

[0014] The design of the connecting tube and the base provides support for the positioning plate, preventing it from directly contacting the ground. It also increases the front-to-back width of the lower end of the pressing tool, preventing it from wobbling back and forth and improving the stability of the portable pressing tool after placement. The disc-shaped contact part makes the connection between the base and the ground more secure, preventing the pressing tool from shaking during the pressing process and affecting the pressing accuracy.

[0015] In the aforementioned portable press-fitting tool for an electric motor, the length of the screw is greater than the length of the guide rod.

[0016] The length of the screw is greater than the length of the guide rod, which can prevent the guide rod from interfering with the rotation of the handle at the upper end of the screw. When the bearing pressure column presses the bearing of the rotor assembly or the bearing of the stator assembly into place, the upper part of the guide rod is still located above or inside the guide sleeve, thereby ensuring better stability when the pressure plate moves up and down under the drive of the screw, which is beneficial to improving the accuracy of this portable pressing tool.

[0017] In the aforementioned portable press-fitting tool for an electric motor, the upper end of the support frame is provided with an upper connector, the upper side of the upper connector is provided with an upper tenon in the middle, both ends of the upper side of the mounting frame are fixedly connected with connecting blocks, the outer side of the connecting block is provided with a slot through which the connecting block passes vertically, the upper tenon can be inserted into the slot, the upper side of the upper connector can abut against the lower side of the connecting block, the front and rear sides of the slot are provided with upper mounting holes, the upper side of the upper connector is provided with an upper threaded hole that mates with the upper mounting hole, the upper connector and the connecting block are fixedly connected by an upper fastener, the upper fastener passes through the upper mounting hole and is threadedly connected to the upper threaded hole.

[0018] The aforementioned support frame and mounting frame are connected by an upper connector with a tenon and a connecting block with a slot. During installation, the upper tenon is first inserted into the slot, at which point the upper mounting hole and the upper threaded hole automatically align. Then, the upper connector and the connecting block are fixed by the upper fastener, thus completing the fixed connection between the support frame and the mounting frame. The operation is convenient. The method of first tenoning and then fastening makes the connection between the support frame and the mounting frame more robust and more stable.

[0019] In the aforementioned portable press-fitting tool for an electric motor, the lower end of the support frame is provided with a lower connector, the lower connector has a lower tenon in the middle of its lower side, both ends of the positioning plate are provided with mortises that mate with the lower tenon, the lower tenon can be inserted into the mortises, the lower side of the lower connector can abut against the upper side of the positioning plate, the front and rear sides of the mortise are provided with lower mounting holes, the lower side of the lower connector is provided with a lower threaded hole that mates with the lower mounting hole, the lower connector and the positioning plate are fixedly connected by a lower fastener, the lower fastener passes through the lower mounting hole and is threadedly connected to the lower threaded hole.

[0020] The aforementioned support frame and positioning plate are connected by a lower connector with a lower tenon and a mortise on the positioning plate. During installation, the lower tenon is first inserted into the mortise, at which point the lower mounting hole and the lower threaded hole automatically align. Then, the lower connector and positioning plate are fixed by the lower fastener, thus completing the fixed connection between the support frame and the positioning plate. The operation is convenient. The method of first tenoning and then fastening makes the connection between the support frame and the positioning plate more robust and more stable.

[0021] In the aforementioned portable press-fitting tool for an electric motor, the main bodies of the positioning plate, mounting bracket, and support frame are all made of hollow square tubing.

[0022] The main body of the aforementioned positioning plate, mounting bracket, and support frame are all made of hollow square tubing, which effectively reduces the overall weight of this portable pressing tool, making it easier for workers to handle and carry.

[0023] In the aforementioned portable press-fitting tool for an electric motor, the positioning fixture is cylindrical, and the bottom of the positioning fixture is detachably fixed to the middle of the positioning plate. The motor rotor assembly can be inserted into the positioning fixture, and the outer side of the middle part of the motor rotor assembly can abut against the inner wall of the positioning fixture. The depth of the positioning fixture is less than the height of the motor rotor assembly.

[0024] The aforementioned positioning fixture can fix the rotor assembly, making the rotor assembly's shaft parallel to the screw. This effectively prevents the shaft and bearing from tilting relative to each other during press-fitting, thus improving the stability of this portable press-fitting tool.

[0025] The working principle of this portable pressing tool is as follows:

[0026] When assembling the bearings of the rotor assembly: First, place the rotor assembly on the positioning fixture. Place the bearing positioning fixture on the inner circle of the rotor assembly. Then, place the bearing into the bearing positioning fixture and fit it onto the rotor shaft. Next, place a cylindrical bearing pressure post on the upper side of the bearing. Turn the handle to rotate the screw, thereby driving the top block on the pressure plate to move down. After the top block abuts against the bearing pressure post, it continues to move down until the bearing is pressed into place. Finally, turn the handle in the opposite direction to return the top block to its initial position. Remove the bearing pressure post and the bearing positioning fixture in sequence to complete the bearing assembly of the rotor assembly.

[0027] When assembling the bearings of the stator assembly: First, install the stator assembly into the rotor assembly located on the positioning fixture. Then, place the bearing into the bearing chamber of the stator assembly, place the T-shaped bearing pressure post, turn the handle to rotate the screw, thereby driving the top block on the pressure plate to move down. After the top block abuts against the limiting part of the bearing pressure post, continue to move down until the bearing is pressed into place. Finally, turn the handle in the opposite direction to return the top block to the initial position, remove the bearing pressure post, install the shaft elastic retaining ring with snap ring pliers, and then install the dust cover on the bearing chamber of the stator assembly to complete the assembly.

[0028] Compared with the prior art, the technical effects of this utility model are as follows:

[0029] This utility model features a simple structure, small size, and easy portability. The positioning plate, positioning fixture, mounting frame, and support frame are all detachable, allowing for easy disassembly during transport and further reducing its volume. This facilitates on-site assembly after repairs. The positioning fixture positions the motor rotor assembly, and a screw drives the top block downwards, pressing the bearing into place. The screw-driven mechanism ensures a slow and stable downward movement of the top block, providing force feedback once the bearing is in place, preventing continued pressure on the bearing and improving the pressing accuracy. The guide sleeve and guide rod design ensure stability during the top block's downward movement, preventing offset and further enhancing the pressing accuracy. This ensures the bearings in the rotor assembly and stator assembly are pressed into place with high precision, resolving the assembly relationship between the stator assembly, rotor assembly, and bearings, resulting in better dynamic balance in the assembled motor. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0031] Figure 2 This is a structural schematic diagram of the bearing in the press-fit rotor assembly of this utility model.

[0032] Figure 3 This is a cross-sectional view of the pressure plate, guide rod, and screw of this utility model.

[0033] Figure 4 This is a structural schematic diagram of the mounting bracket of this utility model.

[0034] Figure 5 This is a structural schematic diagram of the positioning plate of this utility model.

[0035] Figure 6 This is a structural schematic diagram of the support frame of this utility model.

[0036] Figure 7 This is a structural schematic diagram of the lower connecting part of this utility model.

[0037] Figure 8 This is a structural schematic diagram of the connecting pipe and the base of this utility model.

[0038] Figure 9 This is a structural schematic diagram of the connection between the mounting frame and the support frame of this utility model.

[0039] Figure 10 This is a structural schematic diagram of the connection between the support frame and the positioning plate of this utility model.

[0040] Figure 11 This is a cross-sectional view of the positioning fixture, rotor assembly, bearing, and bearing pressure column of this utility model.

[0041] Figure 12 This utility model is a three-dimensional bearing positioning fixture. Figure 1 .

[0042] Figure 13 This utility model is a three-dimensional bearing positioning fixture. Figure 2 .

[0043] Figure 14 This is an exploded cross-sectional view of the bearing pressure column and stator assembly of this utility model.

[0044] Figure 15 This is a schematic diagram of the T-shaped bearing pressure column of this utility model.

[0045] In the diagram, 1. Positioning plate; 11. Positioning fixture; 12. Tenon; 13. Lower mounting hole; 2. Mounting bracket; 21. Worktable; 211. Guide sleeve; 212. Threaded hole; 22. Connecting block; 221. Slot; 222. Upper mounting hole; 3. Support bracket; 31. Upper connector; 311. Upper tenon; 312. Upper threaded hole; 32. Upper fastener; 33. Lower connector; 331. Lower tenon; 332. Lower threaded hole; 34. Lower fastener ; 4. Pressure plate; 41. Guide rod; 42. Screw; 43. Limiting component; 44. Handle; 45. Top block; 5. Bearing pressure column; 51. Limiting part; 52. Pressing part; 6. Bearing positioning fixture; 61. Positioning plate; 62. Outer positioning ring; 63. Inner positioning ring; 64. Positioning hole; 7. Connecting pipe; 71. Foot; 711. Contact part; 81. Rotor assembly; 82. Stator assembly; 821. Bearing chamber; 83. Bearing; 84. Rotating shaft. Detailed Implementation

[0046] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0047] The portable press-fitting tool for this motor includes a positioning plate 1, a positioning fixture 11, a mounting frame 2, and two support frames 3. The positioning fixture 11 is installed in the middle of the positioning plate 1. The positioning plate 1 and the mounting frame 2 are arranged parallel to each other. The two support frames 3 are installed between the positioning plate 1 and the mounting frame 2 and are perpendicular to the positioning plate 1. The lower ends of the two support frames 3 are detachably connected to both ends of the positioning plate 1, and the upper ends are detachably connected to both ends of the mounting frame 2. A workbench 21 is provided in the middle of the mounting frame 2. Guide sleeves 211 perpendicular to the workbench 21 are installed at both ends of the workbench 21. Guides are slidably arranged inside the guide sleeves 211. The worktable 21 is equipped with a pressure plate 4 below the rod 41. The lower ends of the two guide rods 41 are fixedly connected to the two ends of the pressure plate 4 respectively. The middle part of the worktable 21 is provided with a threaded hole 212. The screw 42 passes through the threaded hole 212 and the lower end of the screw 42 is rotatably connected to the middle part of the pressure plate 4. The pressure plate 4 is provided with a limiting member 43 to fix the screw 42 axially. The upper end of the screw 42 is provided with a handle 44 to drive the screw 42 to rotate. The lower end of the pressure plate 4 is provided with a top block 45. The top block 45 is coaxially arranged with the positioning fixture 11. The top block 45 can abut against the bearing pressure column 5 and drive the bearing 83 to move down through the bearing pressure column 5.

[0048] This portable pressing tool has a simple structure, small size, and is easy to carry. The positioning plate 1, positioning fixture 11, mounting frame 2, and support frame 3 are all detachable. When handling and carrying, the tool can be disassembled to further reduce its size, making it convenient for maintenance personnel to bring it to the site for post-repair assembly work. In this portable pressing tool, the positioning fixture 11 positions the motor rotor assembly 81, and then the screw 42 drives the top block 45 downwards, allowing the bearing pressure column 5 to press the bearing 83 into place. The screw 42's driving method ensures that the top block 45 moves downwards slowly and steadily. Once the bearing 83 is pressed into place, there will be force feedback, preventing continuous pressure on the bearing 83 after it is pressed into place, thus improving the pressing accuracy of this portable pressing tool. The design of the guide sleeve 211 and guide rod 41 ensures the stability of the top block 45 when it moves down, preventing the top block 45 from shifting down, thus improving the pressing accuracy of this portable pressing tool. This ensures that the bearing 83 in the rotor assembly 81 and the bearing 83 in the bearing chamber 821 of the stator assembly 82 can be pressed into place with high pressing accuracy, thereby solving the assembly relationship between the stator assembly 82, the rotor assembly 81 and the bearing 83, and giving the assembled motor better dynamic balance.

[0049] like Figure 11-13As shown, the bearing pressure post 5 is cylindrical. Above the positioning fixture 11, there is a bearing positioning fixture 6 that can be inserted into the rotor assembly 81 of the motor. The bearing positioning fixture 6 includes a positioning disk 61, an outer positioning ring 62, and an inner positioning ring 63 arranged coaxially. The positioning disk 61 has a positioning hole 64 in the middle. The upper end of the inner positioning ring 63 is fixedly connected to the positioning disk 61. The inner diameter of the inner positioning ring 63 is equal to the diameter of the positioning hole 64. The outer diameter of the outer positioning ring 62 is smaller than the diameter of the positioning disk 61. The outer side wall of the outer positioning ring 62 can abut against the inner wall of the rotor assembly 81. The positioning disk 61 can abut against the upper end of the rotor assembly 81. The outer diameter of the bearing pressure post 5 is less than or equal to the outer diameter of the bearing 83, and the inner diameter of the bearing pressure post 5 is greater than or equal to the inner diameter of the bearing 83. When the bearing pressure post 5 is cylindrical, it is used to press the bearing 83 of the rotor assembly 81. The bearing positioning fixture 6 can position the bearing 83 to be installed. In conjunction with the motor shaft 84, it can effectively prevent the bearing 83 from tilting. Then, the bearing pressure post 5 presses the bearing 83 into the rotor assembly 81 along the shaft 84. During the entire pressing process, the inner positioning ring 63 of the bearing positioning fixture 6 and the shaft 84 cooperate to keep the bearing 83 in a stable downward state. This ensures that the bearing 83 does not tilt after pressing and avoids wear caused by the tilting of the bearing 83 during the pressing process. This is beneficial to improving the dynamic balance performance of the motor after assembly and realizes the assembly between the bearing 83 and the rotor assembly 81.

[0050] like Figure 14 and Figure 15 As shown, the bearing pressure post 5 is T-shaped, including a limiting part 51 and a pressing part 52 fixedly connected to the lower end of the limiting part 51. The diameter of the pressing part 52 is less than or equal to the diameter of the bearing chamber 821 of the motor stator assembly 82, and the diameter of the pressing part 52 is greater than the inner diameter of the bearing 83. The diameter of the limiting part 51 is greater than the diameter of the bearing chamber 821 of the motor stator assembly 82. When the bearing pressure post 5 is T-shaped, it is used to press the bearing 83 of the stator assembly 82. The length of the pressing part 52 can be customized according to the height of the bearing chamber 821 and the thickness of the bearing 83. When the limiting part 51 abuts against the stator assembly 82, the pressing part 52 presses the bearing 83 into place, which can effectively prevent the bearing pressure post 5 from continuing to apply pressure to the bearing 83 after it is pressed into place, thus improving the pressing accuracy of this portable pressing tool.

[0051] like Figure 1 , Figure 2 and Figure 8As shown, connecting pipes 7 are fixedly connected to both ends of the positioning plate 1. The length direction of the connecting pipes 7 is perpendicular to the length direction of the positioning plate 1. The connecting pipes 7 are located below the positioning plate 1 and are fixedly connected to the positioning plate 1 in the middle. Foot 71 is fixedly connected to both ends of the connecting pipes 7. The lower end of the foot 71 has a disc-shaped contact portion 711. The design of the connecting pipes 7 and the foot 71 provides support for the positioning plate 1, preventing it from directly contacting the ground. It also increases the front-to-back width of the lower end of the pressing tool, preventing it from wobbling back and forth and improving the stability of the portable pressing tool after placement. The disc-shaped contact portion 711 makes the connection between the foot 71 and the ground more stable, preventing the pressing tool from shaking during the pressing process and affecting the pressing accuracy.

[0052] like Figure 3 As shown, the length of the screw 42 is greater than the length of the guide rod 41. The greater length of the screw 42 prevents the guide rod 41 from interfering with the rotation of the handle 44 at the upper end of the screw 42. When the bearing pressure column 5 presses the bearing 83 of the rotor assembly 81 or the bearing 83 of the stator assembly 82 into place, the upper part of the guide rod 41 remains above or inside the guide sleeve 211. This ensures better stability when the pressure plate 4 moves up and down under the drive of the screw 42, which is beneficial for improving the accuracy of this portable pressing tool.

[0053] like Figure 4 , Figure 6 and Figure 9 As shown, the upper end of the support frame 3 is provided with an upper connector 31. The upper side of the upper connector 31 is provided with an upper tenon 311 in the middle. Both ends of the upper side of the mounting frame 2 are fixedly connected with connecting blocks 22. The outer side of the connecting block 22 is provided with a slot 221 through which the connecting block 22 passes. The upper tenon 311 can be inserted into the slot 221. The upper side of the upper connector 31 can abut against the lower side of the connecting block 22. The front and rear sides of the slot 221 are provided with upper mounting holes 222. The upper side of the upper connector 31 is provided with an upper threaded hole 312 that mates with the upper mounting hole 222. The upper connector 31 and the connecting block 22 are fixedly connected by an upper fastener 32. The upper fastener 32 passes through the upper mounting hole 222 and is threadedly connected to the upper threaded hole 312. The aforementioned support frame 3 and mounting frame 2 are connected by an upper connector 31 with an upper tenon 311 and a connecting block 22 with a slot 221. During installation, the upper tenon 311 is first inserted into the slot 221, at which point the upper mounting hole 222 and the upper threaded hole 312 automatically align. Then, the upper connector 31 and the connecting block 22 are fixed by the upper fastener 32, thus completing the fixed connection between the support frame 3 and the mounting frame 2. The operation is convenient. The method of first tenoning and then fastening makes the connection between the support frame 3 and the mounting frame 2 more solid and more stable.

[0054] like Figure 5 , Figure 7 and Figure 10 As shown, the lower end of the support frame 3 is provided with a lower connector 33. The lower side of the lower connector 33 is provided with a lower tenon 331 in the middle. Both ends of the positioning plate 1 are provided with mortises 12 that cooperate with the lower tenon 331. The lower tenon 331 can be inserted into the mortises 12. The lower side of the lower connector 33 can abut against the upper side of the positioning plate 1. The front and rear sides of the mortises 12 are provided with lower mounting holes 13. The lower side of the lower connector 33 is provided with a lower threaded hole 332 that cooperates with the lower mounting hole 13. The lower connector 33 and the positioning plate 1 are fixedly connected by a lower fastener 34. The lower fastener 34 passes through the lower mounting hole 13 and is threadedly connected to the lower threaded hole 332. The aforementioned support frame 3 and positioning plate 1 are connected by a lower connector 33 with a lower tenon 331 and a mortise 12 on the positioning plate 1. During installation, the lower tenon 331 is first inserted into the mortise 12, at which point the lower mounting hole 13 and the lower threaded hole 332 automatically align. Then, the lower connector 33 and positioning plate 1 are fixed by the lower fastener 34, thus completing the fixed connection between the support frame 3 and the positioning plate 1. This method of first tenoning and then fastening makes the connection between the support frame 3 and the positioning plate 1 more robust and more stable.

[0055] like Figure 1 , Figure 2 and Figure 11 As shown, the positioning fixture 11 is cylindrical. The bottom of the positioning fixture 11 is detachably fixed to the middle of the positioning plate 1. The motor rotor assembly 81 can be inserted into the positioning fixture 11, and the outer side of the middle part of the motor rotor assembly 81 can abut against the inner wall of the positioning fixture 11. The depth of the positioning fixture 11 is less than the height of the motor rotor assembly 81. The structure of the positioning fixture 11 can fix the rotor assembly 81, making the rotating shaft 84 of the rotor assembly 81 parallel to the screw 42. This can effectively prevent the rotating shaft 84 and the bearing 83 from tilting relative to each other when pressing the bearing 83, which is beneficial to improving the stability of this portable pressing tool.

[0056] Furthermore, the main bodies of the positioning plate 1, mounting bracket 2, and support bracket 3 are all made of hollow square tubing. The fact that the main bodies of the positioning plate 1, mounting bracket 2, and support bracket 3 are all made of hollow square tubing effectively reduces the overall weight of this portable pressing tool, making it easier for workers to handle and carry.

[0057] When assembling the bearing 83 of the rotor assembly 81: First, place the rotor assembly 81 on the positioning fixture 11. Place the bearing positioning fixture 6 on the inner circle of the rotor assembly 81. Then, place the bearing 83 into the bearing positioning fixture 6 and fit the bearing 83 onto the rotor shaft 84. Next, place the cylindrical bearing pressure column 5 on the upper side of the bearing 83. Rotate the handle 44 to rotate the screw 42, thereby driving the top block 45 on the pressure plate 4 to move down. After the top block 45 abuts against the bearing pressure column 5, it continues to move down until the bearing 83 is pressed into place. Finally, rotate the handle 44 in the opposite direction to return the top block 45 to its initial position. Then, remove the bearing pressure column 5 and the bearing positioning fixture 6 in sequence, thus completing the assembly of the bearing 83 of the rotor assembly 81.

[0058] When assembling the bearing 83 of the stator assembly 82: First, install the stator assembly 82 into the rotor assembly 81 located on the positioning fixture 11, then place the bearing 83 into the bearing chamber 821 of the stator assembly 82, place the T-shaped bearing pressure post 5, turn the handle 44 to make the screw 42 rotate, thereby driving the top block 45 on the pressure plate 4 to move down. After the top block 45 abuts against the limiting part 51 of the bearing pressure post 5, it continues to move down until the bearing 83 is pressed into place. Finally, turn the handle 44 in the opposite direction to make the top block 45 return to the initial position, remove the bearing pressure post 5, install the shaft elastic retaining ring with snap ring pliers, and then install the dust cover on the bearing chamber 821 of the stator assembly 82 to complete the assembly.

[0059] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. A portable pressing tool for motors, characterized in that: The system includes a positioning plate (1), a positioning fixture (11), a mounting frame (2), and two support frames (3). The positioning fixture (11) is installed in the middle of the positioning plate (1). The positioning plate (1) and the mounting frame (2) are arranged in parallel. The two support frames (3) are installed between the positioning plate (1) and the mounting frame (2) and are perpendicular to the positioning plate (1). The lower ends of the two support frames (3) are detachably connected to the two ends of the positioning plate (1), and the upper ends are detachably connected to the two ends of the mounting frame (2). The mounting frame (2) has a workbench (21) in the middle. Guide sleeves (211) perpendicular to the workbench (21) are installed at both ends of the workbench (21). Guide rods (41) are slidably arranged inside the guide sleeves (211). (21) is provided with a pressure plate (4) below it. The lower ends of two guide rods (41) are fixedly connected to the two ends of the pressure plate (4). The middle part of the workbench (21) is provided with a threaded hole (212). The screw (42) passes through the threaded hole (212) and the lower end of the screw (42) is rotatably connected to the middle part of the pressure plate (4). The pressure plate (4) is provided with a limiting member (43) to fix the screw (42) axially. The upper end of the screw (42) is provided with a handle (44) to drive the screw (42) to rotate. The lower end of the pressure plate (4) is provided with a top block (45). The top block (45) is coaxially arranged with the positioning fixture (11). The top block (45) can abut against the bearing pressure column (5) and drive the bearing (83) to move down through the bearing pressure column (5). During the assembly of the rotor assembly bearings, the bearing pressure column (5) is cylindrical, and a bearing positioning fixture (6) capable of being inserted into the rotor of the motor is provided above the positioning fixture (11). The bearing positioning fixture (6) includes a positioning disk (61), an outer positioning ring (62), and an inner positioning ring (63) arranged coaxially. The positioning disk (61) has a positioning hole (64) in the middle. The upper end of the inner positioning ring (63) is fixedly connected to the positioning disk (61). The inner diameter of the inner positioning ring (63) is equal to... Regarding the diameter of the positioning hole (64), the outer diameter of the outer positioning ring (62) is smaller than the diameter of the positioning disk (61), the outer side wall of the outer positioning ring (62) can abut against the inner wall of the rotor, and the positioning disk (61) can abut against the upper end of the rotor; the outer diameter of the bearing pressure column (5) is less than or equal to the outer diameter of the bearing (83), the inner diameter of the bearing pressure column (5) is greater than or equal to the inner diameter of the bearing (83), and the inner diameter of the inner positioning ring (63) is greater than or equal to the outer diameters of the bearing (83) and the bearing pressure column (5).

2. The portable pressing tool for an electric motor according to claim 1, characterized in that: When assembling the bearing of the stator assembly, the bearing pressure post (5) is T-shaped, including a limiting part (51) and a pressing part (52) fixedly connected to the lower end of the limiting part (51). The diameter of the pressing part (52) is less than or equal to the diameter of the bearing chamber (821) of the motor stator, the diameter of the pressing part (52) is greater than the inner diameter of the bearing (83), and the diameter of the limiting part (51) is greater than the diameter of the bearing chamber (821) of the motor stator.

3. The portable pressing tool for an electric motor according to claim 1, characterized in that: The positioning plate (1) is fixedly connected to two ends of a connecting pipe (7). The length direction of the connecting pipe (7) is perpendicular to the length direction of the positioning plate (1). The connecting pipe (7) is located below the positioning plate (1) and the middle part of the connecting pipe (7) is fixedly connected to the positioning plate (1). The two ends of the connecting pipe (7) are fixedly connected to a foot (71). The lower end of the foot (71) has a disc-shaped contact part (711).

4. The portable pressing tool for an electric motor according to claim 1, characterized in that: The length of the screw (42) is greater than the length of the guide rod (41).

5. A portable pressing tool for an electric motor according to any one of claims 1-4, characterized in that: The upper end of the support frame (3) is provided with an upper connector (31). The upper side of the upper connector (31) is provided with an upper tenon (311) in the middle. Both ends of the upper side of the mounting frame (2) are fixedly connected with connecting blocks (22). The outer side of the connecting block (22) is provided with a slot (221) through which the connecting block (22) passes vertically. The upper tenon (311) can be inserted into the slot (221). The upper side of the upper connector (31) can abut against the lower side of the connecting block (22). The front and rear sides of the slot (221) are provided with upper mounting holes (222). The upper side of the upper connector (31) is provided with an upper threaded hole (312) that mates with the upper mounting hole (222). The upper connector (31) and the connecting block (22) are fixedly connected by an upper fastener (32). The upper fastener (32) passes through the upper mounting hole (222) and is threadedly connected to the upper threaded hole (312).

6. A portable pressing tool for an electric motor according to any one of claims 1-4, characterized in that: The lower end of the support frame (3) is provided with a lower connector (33). The lower side of the lower connector (33) is provided with a lower tenon (331) in the middle. Both ends of the positioning plate (1) are provided with mortises (12) that cooperate with the lower tenon (331). The lower tenon (331) can be inserted into the mortises (12). The lower side of the lower connector (33) can abut against the upper side of the positioning plate (1). The front and rear sides of the mortises (12) are provided with lower mounting holes (13). The lower side of the lower connector (33) is provided with a lower threaded hole (332) that cooperates with the lower mounting hole (13). The lower connector (33) and the positioning plate (1) are fixedly connected by a lower fastener (34). The lower fastener (34) passes through the lower mounting hole (13) and is threadedly connected to the lower threaded hole (332).

7. A portable pressing tool for motors according to any one of claims 1-4, characterized in that: The main bodies of the positioning plate (1), mounting bracket (2) and support bracket (3) are all made of hollow square tubes.

8. A portable pressing tool for an electric motor according to any one of claims 1-4, characterized in that: The positioning fixture (11) is cylindrical. The bottom of the positioning fixture (11) is detachably fixed to the middle of the positioning plate (1). The motor rotor can be inserted into the positioning fixture (11) and the outer side of the middle of the motor rotor can abut against the inner wall of the positioning fixture (11). The depth of the positioning fixture (11) is less than the height of the motor rotor.

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