Shaft surface knurling device for motor shaft

Abstract

This invention discloses a knurling processing device for a motor shaft, belonging to the field of motor shaft processing technology. It includes a support platform and two knurling wheels. Two fixed frames are mounted on the support platform, and four rectangularly distributed support wheels are mounted on one side of each frame. Positioning structures for positioning the motor shaft are located on both sides of the support platform. The support wheels and positioning structures move together with the motor shaft and the support platform between the two knurling wheels to perform the knurling operation. This invention adds support wheels to the suspended section of the motor shaft. The support wheels are in contact with the motor shaft and move with it. The support wheels prevent downward bending of the long suspended section of the motor shaft due to its own weight, while simultaneously improving the stability of the motor shaft and mitigating shaft bending caused by vibration during knurling. The elastic pins in the positioning structure can move away from the chuck during knurling, preventing bending of the motor shaft due to thermal expansion.

Description

Technical Field

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

[0002] During the machining of motor shafts, knurling is usually required. Knurling is an extrusion plastic forming process. A double-wheel knurling machine mainly includes two knurling wheels that feed synchronously in opposite directions and a feeding mechanism. The knurling wheels continuously squeeze the workpiece, and the pressure causes the metal surface to undergo plastic flow, pressing out continuous concave and convex textures on the surface of the cylindrical shaft.

[0003] The feeding mechanism needs to fix the shaft and then move it towards the knurling wheel. For shafts with a small length-to-diameter ratio (short and thick), the knurling operation can be performed by fixing both ends of the shaft. For slender shafts with a large length-to-diameter ratio, if only both ends are fixed during the knurling operation, the middle of the shaft will be suspended with a large span. The suspended section will not be supported, and the knurling stress point will be in the middle section of the shaft, which will result in a significant increase in bending deflection and easily cause the shaft to bend.

[0004] Therefore, a device for knurling the shaft surface of a motor shaft is needed to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a knurling device for motor shafts to solve the problem of easy bending of slender motor shafts during knurling operations as mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a knurling processing device for a motor shaft, comprising a support platform and two parallel knurling wheels disposed above the support platform. Two fixed frames are disposed on the support platform, and four support wheels arranged in a rectangular pattern are disposed on one side of the fixed frames. Positioning structures for positioning the motor shaft are disposed on both sides of the support platform. The support wheels and positioning structures move together with the motor shaft and the support platform to the space between the two knurling wheels to perform the knurling operation.

[0007] In a preferred embodiment, the support wheels are arranged in pairs, and a wheel fork is provided on the outer side of each pair of support wheels. A mounting bracket is provided on one side of the wheel fork, and an adjusting nut is rotatably connected to the mounting bracket. A first adjusting rod is fixedly connected to the top of the wheel fork, and the first adjusting rod passes through the mounting bracket and is threadedly connected to the adjusting nut.

[0008] In a preferred embodiment, the mounting bracket has a mounting groove on its side, and the fixing bracket has a plug plate fixedly connected to its side, with one side of the plug plate inserted into the mounting groove.

[0009] In a preferred embodiment, the positioning structure includes a chuck rotatably connected to the support platform. The support platform is also provided with a ejector pin, which is rotatably connected to a front sleeve via a bearing. The outer surface of the front sleeve is provided with a stepped structure, and a spring is sleeved on the stepped structure. The end of the front sleeve with the spring is inserted into the rear sleeve. A slider is fixedly connected to the bottom of the rear sleeve, and an adjustment component for adjusting the position of the slider is provided on the support platform.

[0010] In a preferred embodiment, the adjustment assembly includes a fixed base fixedly connected to the support platform, and a second adjustment rod is rotatably mounted inside the fixed base. The second adjustment rod passes through the slider and is threadedly connected to the slider.

[0011] In a preferred embodiment, a guide strip is fixedly connected to the outer surface of the front sleeve, and a guide groove is provided on the inner side wall of the rear sleeve for the guide strip to be inserted.

[0012] Compared with the prior art, the knurling device for the shaft surface of a motor shaft provided by the present invention has at least the following beneficial effects: (1) By adding four support wheels in a rectangular distribution to the suspended section of the motor shaft, and by cooperating with the mounting bracket and the first adjusting shaft, the support wheels are made to fit with the motor shaft and move with the motor shaft. The support and limiting effect of the support wheels can prevent the long suspended section of the motor shaft from bending downward due to its own weight, and can also improve the stability of the motor shaft. It can also improve the shaft bending caused by the vibration of the motor shaft during the knurling operation, especially at the moment when the motor shaft contacts the knurling wheel.

[0013] (2) By setting rigid three-jaw chucks and elastic ejector pins at both ends of the motor shaft, the motor shaft can push the ejector pins away from the chucks during the knurling operation, thereby preventing the motor shaft from bending due to thermal expansion. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 2 This is an enlarged schematic diagram of the supporting platform part of the present invention; Figure 3 This is a partial structural cross-sectional view of the positioning mechanism of the present invention; Figure 4 This is an enlarged schematic diagram showing the connection relationship between the front sleeve and the rear sleeve of the present invention; Figure 5 This is a schematic diagram showing the connection relationship between the fixing frame and the support wheel of the present invention; Figure 6 This is an exploded view showing the connection relationship between the fixing frame and the support wheel of the present invention; Figure 7 This is a cross-sectional view showing the connection relationship between the support wheel and the mounting frame of the present invention.

[0015] In the diagram: 1. Support platform; 2. Knurled wheel; 3. Lifting component; 4. Fixing frame; 41. Insert plate; 5. Support wheel; 6. Wheel fork; 7. Mounting frame; 71. Mounting groove; 8. First adjusting rod; 9. Adjusting nut; 10. Elastic pad; 11. Fixing bolt; 12. Positioning structure; 13. Chuck; 14. Ejector pin; 15. Front sleeve; 151. Guide bar; 16. Rear sleeve; 161. Guide groove; 17. Spring; 18. Slider; 19. Fixing seat; 20. Second adjusting rod; 21. Adjusting assembly. Detailed Implementation

[0016] The present invention will be further described below with reference to embodiments.

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0018] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by a person skilled in the art to which this disclosure pertains. The words “comprising” or “including” and similar terms used in this disclosure mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. The words “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. “Up,” “down,” “left,” “right,” etc., are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] Please see Figures 1-4This invention provides a knurling processing device for a motor shaft, including a support platform 1 and two knurling wheels 2 disposed above the support platform 1. The two knurling wheels 2 are identical and arranged side by side. The knurling wheels 2 are driven to rotate by a motor. When the two knurling wheels 2 are pressed together for knurling, it is necessary to keep the two knurling wheels 2 rotating in the same direction. For example, a worm gear + Paired worm gear synchronous transmission: One worm simultaneously meshes with two worm gears on the left and right sides. The output directions of the two worm gears are completely consistent, forcing the two knurling wheels 2 to rotate at the same speed and in the same direction (this is existing technology and is not shown in the figure). For example, when the two knurling wheels 2 rotate clockwise, when the motor shaft moves to contact the knurling wheels 2, the linear velocities of the contact points between the two knurling wheels 2 and the motor shaft are opposite to each other, forming a clamping drive effect. During this process, it is not necessary to control the motor shaft to rotate actively. The motor shaft is driven by the friction of the two knurling wheels 2 to rotate in the opposite direction to the knurling wheels 2. In order to facilitate the control of the support platform 1 to move upward and drive the motor shaft to approach and contact the knurling wheels 2, a lifting component 3 is installed at the bottom of the support platform 1. The lifting component 3 can be a hydraulic cylinder. The support platform 1 is driven to move up and down by the hydraulic cylinder. In order to ensure the smooth movement of the support platform 1, a guide column is also provided. The guide column is connected to the equipment housing and passes through the support platform 1.

[0020] Positioning structures 12 for positioning the motor shaft are provided on both sides of the support platform 1. The positioning structure 12 includes a chuck 13. In this application, a conventional three-jaw chuck 13 can be used. It should be noted that, as described above, the motor shaft rotates passively, and the chuck 13 does not need to drive the motor shaft to rotate actively. The chuck 13 only needs to clamp the motor shaft and rotate with it. Therefore, the chuck 13 is rotatably mounted on the support platform 1. On the support platform 1 and at the other end opposite to the chuck 13, a ejector pin 14 is also provided. A front sleeve 15 is rotatably connected to the ejector pin 14 through a bearing. The ejector pin 14 passes through the front sleeve 15. The front sleeve 15 is designed with a stepped structure, and a spring 17 is fitted in the stepped structure. One end of the front sleeve 15 and the spring 17 are inserted into the rear sleeve 16. In order to prevent relative rotation between the front and rear sleeves 16, a guide strip 151 is integrally formed on the outer surface of the front sleeve 15. An opening is made on the inner wall of the rear sleeve 16. A guide groove 161 is provided for the insertion of the guide bar 151. Through the cooperation of the guide bar 151 and the guide groove 161, the front sleeve 15 and the rear sleeve 16 can move laterally but cannot rotate relative to each other. A slider 18 is fixedly connected to the bottom of the rear sleeve 16. An adjustment component 21 for adjusting the position of the slider 18 is provided on the support platform 1. The adjustment component 21 includes a fixed seat 19. The bottom of the fixed seat 19 is welded and fixed to the support platform 1. The lower half of the slider 18 is slidably installed in the fixed seat 19, and the slider 18 has a through threaded hole. A second adjustment rod 20 is rotatably installed in the fixed seat 19. The second adjustment rod 20 is a threaded rod that passes through the threaded hole of the slider 18. A handwheel is connected to one end of the second adjustment rod 20 that extends out of the fixed seat 19, so as to facilitate manual rotation of the second adjustment rod 20. By rotating the second adjustment rod 20, the movement of the slider 18 and the rear sleeve 16 is controlled, thereby controlling the movement of the ejector pin 14.

[0021] When using the positioning structure 12, firstly, one end of the motor shaft is fixed by the chuck 13. Then, the second adjusting rod 20 is rotated to move the slider 18, the rear sleeve 16, the front sleeve 15, and the ejector pin 14, so that the sharp end of the ejector pin 14 abuts against the motor shaft. In actual use, a hole can be drilled at the end of the motor shaft and the edge of the hole can be chamfered to facilitate the positioning of the ejector pin 14. Because the motor shaft will rotate with the knurling wheel 2 during the knurling operation, the ejector pin 14 will rotate together with the motor shaft, while the front sleeve 15 will not rotate.

[0022] Please see Figures 5-7When performing knurling on slender shafts such as motor shafts, fixing both ends of the shaft results in a large span of unsupported middle section, causing the knurling stress point to be in the middle section, which easily leads to bending. Therefore, this application fixes two brackets 4 on the support platform 1, located between the chuck 13 and the ejector pin 14. Four rectangular support wheels 5 are arranged on one side of each bracket 4, surrounding the motor shaft. Each pair of support wheels 5 forms a group, and a wheel fork 6 is provided on the outer side of each group. The support wheels 5 are rotatably connected to the wheel fork 6. A first adjusting rod 8 is fixedly connected to the wheel fork 6. The first adjusting rod 8 is a threaded rod. Additionally, a mounting bracket 7 with a through hole is provided, and an adjusting nut 9 is rotatably connected to the mounting bracket 7. The first adjusting rod 8 passes through the mounting bracket 7 and the adjusting nut 9, and the first adjusting rod 8 is threadedly connected to the adjusting nut 9. It should be noted that after installation, due to the restriction of the mounting bracket 7, the wheel fork 6 can only move vertically. When the adjusting nut 9 is rotated, the first adjusting rod 8 will move along the axial direction. Mounting bracket 7 has mounting grooves 71 on both sides. Insert plate 41 is fixedly connected to the side of fixed bracket 4. One end of insert plate 41 is inserted into the mounting groove 71 on the side of mounting bracket 7. In addition, through holes are opened on mounting bracket 7 and insert plate 41. Fixing bolt 11 passes through mounting bracket 7 and insert plate 41. Elastic pad 10 is provided on the inner wall of mounting groove 71, especially above and below insert plate 41. In this application, polyurethane elastic pad 10 can be used.

[0023] After the positioning structure 12 fixes both ends of the motor shaft, the first adjusting rod 8 and the wheel fork 6 are moved by rotating the adjusting nut 9, thereby driving the support wheel 5 to move. This makes the four support wheels 5 on the side of each fixed plate rectangular and fit against the motor shaft. Four support wheels 5 are set on each side of the knurled section of the motor shaft to support the motor shaft and prevent the motor shaft from bending due to the excessive length of the suspended section during the knurling operation. At the same time, the elastic pad 10 between the mounting frame 7 and the insert plate 41 allows the mounting frame 7 to compress the elastic pad 10 and move it in the vertical direction, preventing equipment damage caused by the bending of the motor shaft in case of accidents.

[0024] In summary, the rigid fixation of the motor shaft by the chuck 13 prevents axial movement of the motor shaft during knurling operations. The other end of the motor shaft is elastically positioned by the ejector pin 14. Since the ejector pin 14 and the front sleeve 15 can move together away from the chuck 13, the front sleeve 15 will compress the spring 17 to compensate for the thermal expansion of the slender motor shaft, preventing the slender motor shaft from bending or jamming. When the support platform 1 moves upward, the support wheel 5 moves upward with the motor shaft. This prevents the long suspended section from bending downward due to its own weight and improves stability, thus mitigating problems such as uneven knurling patterns and random patterns caused by shaft vibration.

[0025] In actual use, if the length of the knurling pattern on the motor shaft is greater than the thickness of the knurling wheel 2, it is also necessary to control the lateral movement of the motor shaft when it moves upward to contact the knurling wheel 2 in order to complete the long-distance knurling. That is, it is necessary to add a device structure to control the lateral movement of the support platform 1. This process is not within the scope of this application, so this structure is not shown in this application and the drawings.

[0026] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for knurling the shaft surface of a motor shaft, comprising a support table (1) and two parallel knurling wheels (2) disposed above the support table (1), characterized in that, Two fixed frames (4) are fixedly connected to the support platform (1). Four support wheels (5) are arranged in a rectangular pattern on one side of the fixed frame (4). Positioning structures (12) are provided on both sides of the support wheels (5) to cooperate with the motor shaft for positioning. The support wheels (5) and the positioning structures (12) move together with the motor shaft and the support platform (1) to the two knurling wheels (2) to perform knurling operations.

2. The knurling apparatus for the motor shaft surface according to claim 1, characterized in that, The support wheels (5) are arranged in pairs. Each pair of support wheels (5) is provided with a wheel fork (6) on the outside. A mounting bracket (7) is provided on one side of the wheel fork (6). An adjusting nut (9) is rotatably connected to the mounting bracket (7). A first adjusting rod (8) is fixedly connected to the top of the wheel fork (6). The first adjusting rod (8) passes through the mounting bracket (7) and is threadedly connected to the adjusting nut (9).

3. The knurling apparatus for the motor shaft surface according to claim 2, characterized in that, The mounting bracket (7) has a mounting groove (71) on its side, and the fixing bracket (4) has a plug plate (41) fixedly connected to its side. The plug plate (41) is inserted into the mounting groove (71) on one side.

4. The knurling apparatus for the motor shaft surface according to claim 1, characterized in that, The positioning structure (12) includes a chuck (13), which is rotatably connected to the support platform (1). The support platform (1) is also provided with a ejector pin (14), which is rotatably connected to a front sleeve (15) via a bearing. The outer surface of the front sleeve (15) is provided with a stepped structure, and a spring (17) is sleeved on the stepped structure. One end of the front sleeve (15) with the spring (17) is inserted into the rear sleeve (16). The bottom of the rear sleeve (16) is fixedly connected with a slider (18). The support platform (1) is provided with an adjustment component (21) for adjusting the position of the slider (18).

5. The knurling apparatus for the motor shaft surface according to claim 4, characterized in that, The adjustment assembly (21) includes a fixed seat (19) fixedly connected to the support platform (1). A second adjustment rod (20) is rotatably installed inside the fixed seat (19). The second adjustment rod (20) passes through the slider (18) and is threadedly connected to the slider (18).

6. The knurling apparatus for the motor shaft surface according to claim 4, characterized in that, The outer surface of the front sleeve (15) is fixedly connected with a guide strip (151), and the inner side wall of the rear sleeve (16) is provided with a guide groove (161) for the guide strip (151) to be inserted.

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