Motor rotor shaft pressing device

Abstract

The invention relates to the technical field of motor rotor machining, in particular to a motor rotor shaft pressing device which comprises a workbench, a supporting table is fixedly installed in a groove formed in the center of the workbench, and a shaft pressing pretreatment mechanism is arranged on a positioning mechanism; before shaft pressing, the position of the rotor iron core is locked through the positioning mechanism, meanwhile, clamping and fixing are carried out in cooperation with the clamping and stripping mechanism, the center shaft is located in the center of the pressing head in the center shaft pressing process, it is ensured that the pressing head is balanced in stress, meanwhile, position deviation of the rotor iron core in the shaft pressing process is avoided, the shaft pressing effect is guaranteed, and the production efficiency is improved. The positioning mechanism is matched with the shaft pressing pretreatment mechanism to remove impurities left in the iron core in the position calibration process, so that the subsequent shaft pressing can be smoothly carried out, and manual special cleaning is not needed; and the rotor iron core is directly jacked up from the positioning table while the shaft pressing rear clamping and stripping mechanism relieves clamping, so that deflection of the rotating shaft caused by forced separation by external force is avoided.

Description

Technical Field

[0001] This invention belongs to the field of motor rotor processing technology, and specifically relates to a motor rotor pressing shaft device. Background Technology

[0002] Motor rotor pressing is an important production process in which the shaft of the motor rotor is precisely and interference-fitted into the rotor core. Motor rotor pressing is to ensure that the rotor core and the shaft are absolutely reliable when the motor is rotating at high speed and transmitting torque, without any loosening or relative movement. When the rotor rotates at high speed, the rotor core will be subjected to huge centrifugal force and tend to fly outward. It needs to be borne and restrained by the shaft. Therefore, by pressing the shaft, the core can be firmly bound to the shaft, preventing it from being deformed or damaged due to centrifugal force.

[0003] Existing motor rotor pressing shafts require manual fixing of the iron core before processing, followed by cold pressing using a hydraulic press. Before cold pressing, it's crucial to ensure the iron core is centered at the pressing point; otherwise, the overall stress on the equipment may become unbalanced. Furthermore, manual cleaning is necessary before pressing to prevent impurities from remaining on the inner wall of the iron core, increasing the workload for on-site workers. After pressing the central shaft, the stepped portion on the shaft can easily become stuck in the tooling's limiting area, making it difficult to detach. Forcibly removing it from the outside may affect the accuracy of the central shaft or cause scratches on the rotor surface. Therefore, designing a motor rotor pressing shaft device is essential. Summary of the Invention

[0004] The purpose of this invention is to provide a motor rotor pressing shaft device with a simple structure and reasonable design in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions: A motor rotor pressing device includes a worktable, a support platform fixedly installed in a groove at the center of the worktable, a positioning platform on the top of the support platform, a clamping and unloading mechanism on the positioning platform, a lifting mechanism inside the support platform, a positioning mechanism installed on the lifting mechanism, a pressing pre-processing mechanism on the positioning mechanism, an upper support on the top of the worktable, a hydraulic cylinder embedded in the upper support, and a pressing connector at the output end of the hydraulic cylinder. The clamping and unloading mechanism includes a sliding groove on the positioning platform, a sliding strip slidably connected in the sliding groove, a connecting groove on one end of the sliding strip, a connecting column slidably connected in the connecting groove, the connecting column being fixedly connected to the output end of the locking cylinder, the locking cylinder being fixed in the positioning platform, and a force-relieving ejection mechanism being provided on the sliding strip.

[0006] As a further optimization of the present invention, the force-relieving ejection mechanism includes a first support block and a second support block fixed on one side of the sliding bar. A clamping frame is provided on the top of the sliding bar. The first support block is slidably connected in a straight slide rail, and the second support block is slidably connected in a curved slide rail. Both the straight slide rail and the curved slide rail are opened on one side of the connecting groove.

[0007] As a further optimization of the present invention, the lifting mechanism includes a side support fixed on the support platform, a mounting frame fixedly connected to the side support, guide rails symmetrically arranged on the inner wall of the mounting frame, and a lifting platform slidably connected to the guide rails.

[0008] As a further optimization of the present invention, a fixed frame is provided on one side of the mounting frame, and a lifting cylinder is fixedly installed in the fixed frame. The output end of the lifting cylinder is connected to a lifting platform on one side, and an inner support is provided between the two lifting platforms.

[0009] As a further optimization of the present invention, the positioning mechanism includes a central motor fixed in the inner bracket, the output end of the central motor is fixedly connected to a transmission screw, the transmission screw is connected in conjunction with a support sleeve, and the support sleeve is fixed on a support ring.

[0010] As a further optimization of the present invention, a guide post is slidably connected in the through holes symmetrically opened on the support ring, the top of the guide post is fixedly connected in the groove opened at the bottom of the central sleeve, and a limit ring is fixed at the bottom of the guide post.

[0011] As a further optimization of the present invention, the top of the central sleeve is provided with an alignment sleeve, and a spring is provided in the groove opened at the bottom of the central sleeve. The spring is sleeved on the guide post, and the bottom end of the spring is connected to the support ring.

[0012] As a further optimization of the present invention, the pretreatment mechanism for pressing the shaft includes a cleaning brush disposed on the side wall of the central sleeve, and spherical protrusions are symmetrically disposed on both sides of the bottom of the central sleeve. The surface of the spherical protrusions is provided with a friction surface, and the spherical protrusions are slidably connected in the longitudinal slide.

[0013] As a further optimization of the present invention, the longitudinal slide is symmetrically opened on the inner wall of the outer sleeve, and support plates are symmetrically arranged on both sides of the bottom of the outer sleeve, and the support plates are fixedly installed on the inner bracket.

[0014] As a further optimization of the present invention, an annular slide is provided at the top of the inner wall of the outer sleeve, and a friction surface is provided on the side wall of the annular slide. The annular slide is connected to the longitudinal slide.

[0015] The beneficial effects of this invention are as follows: Before the pressing process, the central motor in the inner support drives the transmission screw to rotate. During the rotation, the central sleeve cannot rotate due to the limitation of the longitudinal slide and the spherical protrusion. At this time, the threaded engagement between the transmission screw and the support sleeve will drive the support ring and the central sleeve to move upward along the longitudinal slide. During the upward movement, the central sleeve extends out of the outer sleeve from the top, and the alignment sleeve at the top of the central sleeve enters the through hole in the center of the rotor core. The alignment sleeve forces the axis of the rotor core to be consistent with the axis of the central sleeve through the tapered surface at the top, so that the central shaft is in the center of the pressing joint during the pressing process, ensuring that the pressing joint is under balanced force. At the same time, the locking cylinder pulls the sliding bar to slide into the sliding groove through the connecting column. The clamping bracket at the top of the sliding bar locks the position of the rotor core, preventing the rotor core from shifting position during the pressing process and ensuring the pressing effect.

[0016] This invention uses the rotation of a transmission screw to continuously move the central sleeve upwards, allowing the central sleeve to fully enter the through hole of the rotor core. The cleaning brush adheres to the inner wall of the through hole, while the spherical protrusion enters the annular slide from the longitudinal slide. At this time, the central sleeve rotates under the drive of the transmission screw, cleaning the through hole of the rotor core and removing impurities remaining in the through hole. This ensures the smooth progress of subsequent shaft pressing, eliminating the need for manual cleaning and reducing the labor intensity of on-site personnel.

[0017] In this invention, after the pressure shaft is pressed, the hydraulic cylinder drives the pressure joint to return to its position, and the locking cylinder drives the sliding bar to slide out of the sliding groove through the connecting column. One end of the sliding groove moves linearly under the cooperation of the first support block and the straight slide, while the other end of the sliding groove tilts upward along the path of the curved slide under the cooperation of the second support block and the curved slide, so that one end of the sliding bar directly lifts the rotor core from below, avoiding external force forcibly separating it and causing the shaft to deflect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the installation position of the lifting mechanism of the present invention; Figure 3 This is a partial three-dimensional structural diagram of the present invention; Figure 4 yes Figure 3 A magnified view of a portion of region A in the middle; Figure 5 This is a partially exploded view of the structure of the present invention; Figure 6 This is a schematic diagram showing the locations of the straight and curved slides in this invention; Figure 7 This is a partial structural schematic diagram of the present invention; Figure 8 This is a three-dimensional structural schematic diagram of the positioning stage of the present invention.

[0019] In the diagram: 1. Workbench; 2. Support platform; 3. Positioning platform; 4. Clamping and unloading mechanism; 5. Lifting mechanism; 6. Positioning mechanism; 7. Pre-treatment mechanism for pressing shaft; 8. Upper support; 9. Hydraulic cylinder; 10. Press joint; 40. Clamping frame; 41. Sliding groove; 42. Sliding bar; 43. Connecting groove; 44. Connecting column; 45. Locking cylinder; 46. First support block; 47. Second support block; 48. Straight slide; 49. Curved slide; 51. 52. Side support; 53. Mounting bracket; 54. Guide rail; 55. Lifting platform; 56. Lifting cylinder; 57. Inner bracket; 68. Central motor; 69. Transmission screw; 60. Support sleeve; 61. Support ring; 62. Guide post; 63. Central sleeve; 64. Limiting ring; 65. Alignment sleeve; 76. Spring; 77. Cleaning brush; 78. Spherical protrusion; 79. Longitudinal slide; 70. Outer sleeve; 71. Support plate; 72. Annular slide. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example: Please refer to Figure 1-8 A motor rotor pressing device includes a worktable 1, a support platform 2 fixedly installed in a groove at the center of the worktable 1, a positioning platform 3 on the top of the support platform 2 for supporting the rotor core to be pressed, a clamping and unloading mechanism 4 for fixing the rotor core on the positioning platform 3, a lifting mechanism 5 inside the support platform 2, a positioning mechanism 6 installed on the lifting mechanism 5, and a pressing pre-treatment mechanism 7 for cleaning the inner wall of the through hole of the rotor core on the positioning mechanism 6. Before pressing, the positioning mechanism 6 calibrates the position of the rotor core and cleans the through hole to be pressed in conjunction with the pressing pre-treatment mechanism 7. During the pressing process, the lifting mechanism 5 drives the positioning mechanism 6 to move down to reserve space for pressing. An upper support 8 for installing a hydraulic cylinder 9 is provided on the top of the worktable 1. A pressure connector 10 is provided at the output end of the hydraulic cylinder 9. The hydraulic cylinder 9 is connected to an oil pump and an oil tank through a pipe. After the hydraulic oil is input into the hydraulic cylinder 9, it drives the pressure connector 10 to press down, cold pressing the central shaft into the rotor core.

[0022] Please see Figure 2-3 , Figure 5-6 and Figure 8The clamping and unloading mechanism 4 includes a sliding groove 41 on the positioning table 3. A sliding strip 42 is slidably connected in the sliding groove 41. A clamping frame 40 is fixed to the top of the sliding strip 42. A connecting groove 43 is provided at one end of the sliding strip 42. A connecting column 44 is slidably connected in the connecting groove 43. The connecting column 44 is fixedly connected to the output end of the locking cylinder 45. During the process of the locking cylinder 45 driving the connecting column 44 to move back and forth, the sliding strip 42 will be pulled to slide in the sliding groove 41 through the connecting groove 43. The locking cylinder 45 is fixed in the positioning table 3 by a bracket. A force-relieving ejection mechanism is provided on the sliding strip 42. The force-relieving ejection mechanism includes a first [missing information - likely a component or part] fixed to one side of the sliding strip 42. Support block 46 and second support block 47 are provided. The first support block 46 is slidably connected in the straight slide rail 48, and the second support block 47 is slidably connected in the curved slide rail 49. Both the straight slide rail 48 and the curved slide rail 49 are opened on one side of the connecting groove 43. When the rotor core is locked, the sliding bar 42 moves into the sliding groove 41 under the action of the locking cylinder 45. Then, the clamping frame 40 above the sliding bar 42 fixes the core. After the pressing is completed, the locking cylinder 45 drives the sliding bar 42 to move outward. As the second support block 47 slides in the curved slide rail 49, one end of the sliding bar 42 will tilt upward. Then, the sliding bar 42 will tilt the rotor core that has been pressed onto the central rotating shaft.

[0023] Please see Figure 2-5 The lifting mechanism 5 includes a side support 51 fixed to the support platform 2 by bolts. A mounting frame 52 is fixedly connected to the side support 51. Guide rails 53 are symmetrically installed on the inner wall of the mounting frame 52. A lifting platform 54 is slidably installed on the guide rails 53. A lifting cylinder 55 is installed on one side of the mounting frame 52 by a fixed frame. The output end of the lifting cylinder 55 is connected to the lifting platform 54 on one side. An inner support 56 is provided between the two lifting platforms 54. The lifting cylinder 55 can drive the inner support 56 and the lifting platform 54 to slide up and down along the guide rails 53.

[0024] Please see Figure 3-5 and Figure 7 The positioning mechanism 6 includes a central motor 61 fixed on the inner bracket 56. The output end of the central motor 61 is connected to a transmission screw 62 via a coupling. The transmission screw 62 is threadedly connected to a support sleeve 63. The support sleeve 63 is fixed on a support ring 64. Guide posts 65 are slidably connected in symmetrical through holes on the support ring 64. The top of the guide post 65 is fixedly connected to a groove at the bottom of the central sleeve 66, and a limit ring 67 is fixedly connected to the bottom of the guide post 65. An alignment sleeve 68 is provided on the top of the central sleeve 66. The tapered surface at the top of the alignment sleeve 68 can contact the through hole of the rotor core during the upward movement to center the position of the rotor core. A spring 69 is provided in the groove at the bottom of the central sleeve 66. The spring 69 is sleeved on the guide post 65, and the bottom of the spring 69 is connected to the support ring 64.

[0025] Please see Figure 5 and Figure 7 The pre-treatment mechanism 7 includes a cleaning brush 71 mounted on the side wall of the central sleeve 66. Spherical protrusions 72 are symmetrically arranged on both sides of the bottom of the central sleeve 66, each with a friction surface. The spherical protrusions 72 are slidably connected in a longitudinal slide rail 73, which is symmetrically located on the inner wall of the outer sleeve 74. Support plates 75 are symmetrically fixed on both sides of the bottom of the outer sleeve 74 and are fixedly mounted on the inner bracket 56. An annular slide rail 76 is located at the top of the inner wall of the outer sleeve 74, with friction surfaces on its side walls. The annular slide rail 76 is connected to the longitudinal slide rail 73. After cleaning, the central motor 61 rotates in the opposite direction at low speed. During rotation, the support ring 64 moves downward along the transmission screw 62 in conjunction with the threaded connection, stretching the spring 69. When the spherical protrusions 72 rotate to the position of the longitudinal slide rail 73, the central sleeve 66, under the tension of the spring 69, causes the spherical protrusions 72 to fall back into the longitudinal slide rail 73.

[0026] It should be noted that, in the use of this motor rotor pressing device, firstly, an insulating pad is installed on the top of the rotor core, and the rotor core is placed on the positioning table 3, so that the rotor core is located between the clamping frames 40. Before pressing, the central motor 61 in the inner bracket 56 drives the transmission screw 62 to rotate. During the rotation, the central sleeve 66 cannot rotate due to the limitation of the longitudinal slide 73 and the spherical protrusion 72. At this time, the threaded engagement between the transmission screw 62 and the support sleeve 63 will drive the support ring 64 and the central sleeve 66 to move upward along the longitudinal slide 73. During the upward movement, the central sleeve 66 extends out of the outer sleeve 74 from the top. The alignment sleeve 68 enters the through hole at the center of the rotor core from the bottom. The alignment sleeve 68, through its top tapered surface, forces the axis of the rotor core to align with the axis of the center sleeve 66, ensuring the central shaft is centered on the crimping joint 10 during the crimping process. This ensures the crimping joint 10 is under balanced force. Simultaneously, the locking cylinder 45 pulls the sliding strip 42 into the sliding groove 41 via the connecting column 44. The clamping bracket 40 at the top of the sliding strip 42 locks the position of the rotor core, preventing positional displacement during the crimping process and ensuring the crimping effect. As the transmission screw 62 rotates, the center sleeve 66 continues to move upwards and fully enters the rotor core. After the through hole is opened, the cleaning brush 71 adheres to the inner wall of the through hole, while the spherical protrusion 72 enters the annular slide 76 from the longitudinal slide 73. At this time, the central sleeve 66 rotates under the drive of the transmission screw 62, cleaning the through hole of the rotor core and removing impurities remaining in the through hole, ensuring the smooth operation of the subsequent pressing shaft. No special manual cleaning is required, reducing the labor intensity of on-site personnel. After cleaning, the central motor 61 rotates in the opposite direction at low speed. During the rotation, the spherical protrusion 72 on the central sleeve 66 slides in the annular slide 76. The friction between the friction surface of the spherical protrusion 72 and the friction surface of the annular slide 76 is insufficient. The rotation between the transmission screw 62 and the support sleeve 63 is completely canceled out. At this time, the transmission screw 62 will generate a rotational differential with the support ring 64, so that the support ring 64 moves down along the transmission screw 62 in conjunction with the threaded connection during the rotation. During the process, the spring 69 is gradually stretched. The spring 69 changes from a compressed state to a stretched state and continues to accumulate elastic potential energy. Then, when the spherical protrusion 72 rotates to the position of the longitudinal slide 73, the center sleeve 66 will drive the spherical protrusion 72 to fall into the longitudinal slide 73 again under the tension of the spring 69. At this time, the central motor 61 drives the transmission screw 62 to rotate, causing the entire center sleeve 66 to move down and fall back into the outer sleeve 74.The lifting cylinder 55 pulls the lifting platform 54 downwards, reserving space for the downward pressing of the central shaft. The central shaft is then inserted from above into the through hole of the rotor core. Next, the hydraulic cylinder 9 drives the pressure connector 10 downwards, contacting the top of the central shaft and continuously providing pressure to cold-press the central shaft into the rotor core, completing the pressing action. After pressing, the hydraulic cylinder 9 drives the pressure connector 10 back to its original position. The locking cylinder 45, through the connecting column 44, drives the sliding strip 42 to slide outwards from the sliding groove 41. One end of the sliding groove 41 moves linearly under the cooperation of the first support block 46 and the straight slide rail 48, while the other end of the sliding groove 41, under the cooperation of the second support block 47 and the curved slide rail 49, tilts upwards along the path of the curved slide rail 49, thereby causing one end of the sliding strip 42 to directly lift the rotor core from below, preventing external force from forcibly detaching it and causing the shaft to tilt.

[0027] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A motor rotor pressing device, comprising a worktable, characterized in that: A support platform is fixedly installed in the groove opened at the center of the workbench. A positioning platform is set on the top of the support platform. A clamping and unloading mechanism is set on the positioning platform. A lifting mechanism is set inside the support platform. A positioning mechanism is installed on the lifting mechanism. A pressure shaft pre-processing mechanism is set on the positioning mechanism. An upper support is set on the top of the workbench. A hydraulic cylinder is embedded in the upper support. A pressure connector is set at the output end of the hydraulic cylinder. The clamping and unloading mechanism includes a sliding groove on the positioning platform, a sliding strip slidably connected in the sliding groove, a connecting groove on one end of the sliding strip, a connecting column slidably connected in the connecting groove, the connecting column being fixedly connected to the output end of the locking cylinder, the locking cylinder being fixed in the positioning platform, and a force-relieving ejection mechanism being provided on the sliding strip.

2. The motor rotor pressing shaft device according to claim 1, characterized in that: The force-relieving ejection mechanism includes a first support block and a second support block fixed to one side of the sliding bar. A clamping frame is provided on the top of the sliding bar. The first support block is slidably connected in a straight slide rail, and the second support block is slidably connected in a curved slide rail. Both the straight slide rail and the curved slide rail are opened on one side of the connecting groove.

3. The motor rotor pressing shaft device according to claim 1, characterized in that: The lifting mechanism includes a side support fixed to the support platform, a mounting frame fixedly connected to the side support, guide rails symmetrically arranged on the inner wall of the mounting frame, and a lifting platform slidably connected to the guide rails.

4. The motor rotor pressing shaft device according to claim 3, characterized in that: A fixed frame is provided on one side of the mounting frame, and a lifting cylinder is fixedly installed in the fixed frame. The output end of the lifting cylinder is connected to a lifting platform on one side, and an inner support is provided between the two lifting platforms.

5. The motor rotor pressing shaft device according to claim 4, characterized in that: The positioning mechanism includes a central motor fixed in the inner bracket, and a transmission screw is fixedly connected to the output end of the central motor. The transmission screw is connected in conjunction with the support sleeve, and the support sleeve is fixed on the support ring.

6. The motor rotor pressing shaft device according to claim 5, characterized in that: Guide posts are slidably connected in the symmetrical through holes on the support ring. The top of the guide post is fixedly connected in the groove at the bottom of the central sleeve, and a limit ring is fixed at the bottom of the guide post.

7. The motor rotor pressing shaft device according to claim 6, characterized in that: The top of the central sleeve is provided with an alignment sleeve, and a spring is provided in the groove at the bottom of the central sleeve. The spring is sleeved on the guide post, and the bottom end of the spring is connected to the support ring.

8. The motor rotor pressing shaft device according to claim 7, characterized in that: The pretreatment mechanism for pressing the shaft includes a cleaning brush disposed on the side wall of the central sleeve. Spherical protrusions are symmetrically arranged on both sides of the bottom of the central sleeve. The surface of the spherical protrusions is provided with a friction surface. The spherical protrusions are slidably connected in the longitudinal slide.

9. The motor rotor pressing shaft device according to claim 8, characterized in that: The longitudinal slide rails are symmetrically opened on the inner wall of the outer sleeve, and support plates are symmetrically arranged on both sides of the bottom of the outer sleeve. The support plates are fixedly installed on the inner bracket.

10. A motor rotor pressing shaft device according to claim 9, characterized in that: The inner wall of the outer sleeve is provided with an annular slide rail at the top, and the side wall of the annular slide rail is provided with a friction surface. The annular slide rail is connected to the longitudinal slide rail.

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