A hob positioning mechanism for gear hobbing machining
Patent Information
- Application Number
- CN202522395818.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-12
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-11-12
AI Technical Summary
随着机械制造行业对齿轮精度要求的不断提升，以及多规格、小批量生产需求的增加，现有滚齿加工用定位机构逐渐暴露出诸多不足：现有滚刀多通过多组螺栓固定在安装架上，拆卸更换时需借助扳手等工具，操作繁琐且耗时；部分定位机构仅采用单一方式固定滚刀，加工过程中易因振动导致滚刀松动，进而引发齿形加工误差，甚至造成设备损坏，为此我们提出了一种齿轮滚齿加工用滚刀定位机构
1、该一种齿轮滚齿加工用滚刀定位机构，通过偏心槽驱动多个抵接板同步径向移动，配合磁性吸附层的吸附固定，实现待加工齿轮的定心与双重固定，避免齿轮加工过程中出现位移或晃动，显著降低定位偏差，提升齿轮齿形精度，且磁性吸附层可对齿轮加工或使用过程中产生的金属碎屑进行吸附，抵接板的径向移动行程可通过偏心槽结构灵活调节，能够适配不同内径、外径的待加工齿轮。
Smart Images
Figure CN224824772U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gear processing technology, specifically a hobbing cutter positioning mechanism for gear hobbing. Background Technology
[0002] Gear hobbing is a core process in the gear manufacturing industry. The positioning accuracy of the hob and the gear being machined directly determines key quality indicators such as tooth profile accuracy, pitch uniformity, and tooth direction error. Its positioning stability and ease of operation are also crucial factors affecting production efficiency and product qualification rate. With the increasing demands for gear precision in the machinery manufacturing industry, and the growing need for multi-specification, small-batch production, existing positioning mechanisms for gear hobbing have gradually revealed many shortcomings: existing hobs are mostly fixed to the mounting frame with multiple sets of bolts, requiring tools such as wrenches for disassembly and replacement, making the operation cumbersome and time-consuming; some positioning mechanisms only use a single method to fix the hob, which is prone to loosening due to vibration during machining, leading to tooth profile errors and even equipment damage. Therefore, we propose a hob positioning mechanism for gear hobbing. Utility Model Content
[0003] This invention provides a hob positioning mechanism for gear hobbing, which solves the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: A hob positioning mechanism for gear hobbing includes a mounting frame, a cutting mounting frame mounted on the top of the mounting frame, a rotating frame disposed outside the cutting mounting frame, a detachable hob mounted inside the rotating frame, a second circular rotating plate rotatably connected to the inner wall of the rotating frame, a detachable first mounting plate threadedly connected to the end of the second circular rotating plate, a second locking rod symmetrically slidably connected inside the second circular rotating plate and capable of extending into and engaging with the first mounting plate, a first locking rod fixedly connected to the outside of the first mounting plate, the hob being locked to the outside of the first locking rod, a second mounting plate slidably connected to the outside of the rotating frame, a second locking cylinder rotatably connected to the outside of the second mounting plate, the second locking cylinder being capable of locking and fitting with the end of the first locking rod, a third locking rod symmetrically slidably connected inside the rotating frame, a locking cylindrical rod capable of extending into and engaging with the second mounting plate fixedly connected to the outside of the third locking rod.
[0005] Preferably, the top of the mounting bracket is provided with a transverse sliding groove, and a sliding block is slidably connected in the transverse sliding groove. A first hydraulic cylinder is installed at the bottom of the mounting bracket, and the output shaft of the first hydraulic cylinder is fixedly connected to the sliding block.
[0006] Preferably, a gear fixing frame is fixedly connected to the top of the sliding block, and a first motor is installed on the top of the sliding block and inside the gear fixing frame. The output shaft of the first motor is connected to a rotating cylindrical rod, a rotating plate is fixedly connected to the top of the rotating cylindrical rod, a first circular rotating plate is rotatably connected to the top of the rotating plate, a fixed circular frame is fixedly connected to the top of the rotating plate at the center position of the first circular rotating plate, and a second hydraulic cylinder is rotatably connected to the top of the rotating plate. The output end of the second hydraulic cylinder is rotatably connected to the bottom edge of the first circular rotating plate.
[0007] Preferably, the top of the first circular rotating plate is provided with multiple eccentric grooves, and the outside of the fixed circular frame is provided with multiple sliding grooves, the sliding grooves being positioned corresponding to the eccentric grooves. Each sliding groove is slidably connected with a snap-fit sliding block, the bottom of the snap-fit sliding block is fixedly connected with a sliding cylinder, and the sliding cylinder is slidably connected to the corresponding eccentric groove. The top of the snap-fit sliding block is fixedly connected with an abutment plate, the outside of which can be sleeved to hold the gear to be processed, and the outer wall of the abutment plate is provided with a magnetic adsorption layer, which is adsorbed and snapped onto the inner wall of the gear to be processed.
[0008] Preferably, a third hydraulic cylinder is installed at the inner bottom of the cutting mounting frame, and a sliding frame is fixedly connected to the output end of the third hydraulic cylinder. A second motor is installed at the end of the sliding frame, and the output shaft of the second motor passes through the sliding frame and is connected to the rotating frame.
[0009] Preferably, a third motor is installed at the end of the rotating frame, and the output shaft of the third motor passes through the rotating frame and is connected to the second circular rotating plate. A first snap-fit cylinder is fixedly connected to the center of the end of the second circular rotating plate. A threaded rod is threadedly connected inside the first snap-fit cylinder, and the end of the threaded rod is fixedly connected to the first mounting plate.
[0010] Preferably, the ends of the second circular rotating plate are symmetrically provided with square grooves, and a first spring is fixedly connected in each square groove. The ends of the first springs are fixedly connected to the second locking rods, and the second locking rods are slidably connected to the square grooves. The outside of the first mounting plate is provided with locking holes, and the second locking rods can be inserted into the locking holes for locking.
[0011] Preferably, the end of the rotating frame is provided with a concave groove, and a second spring is symmetrically fixedly connected in the concave groove. The end of the second spring is fixedly connected to a third locking rod, and the third locking rod is slidably connected to the concave groove. The end of the third locking rod is fixedly connected to a pressing cylindrical rod, and the pressing cylindrical rod extends into the rotating frame and is slidably connected to it. The edge of the second mounting plate is provided with a locking groove adapted to the locking cylindrical rod, and the locking cylindrical rod can extend into the locking groove and lock with the second mounting plate.
[0012] This utility model has the following beneficial effects: 1. This hob positioning mechanism for gear hobbing drives multiple abutment plates to move radially synchronously through an eccentric groove, and is fixed by magnetic adsorption layer to achieve centering and double fixation of the gear to be processed, avoiding displacement or shaking during gear processing, significantly reducing positioning deviation, improving gear tooth profile accuracy, and the magnetic adsorption layer can adsorb metal chips generated during gear processing or use. The radial movement stroke of the abutment plates can be flexibly adjusted through the eccentric groove structure, which can adapt to gears with different inner and outer diameters to be processed.
[0013] 2. This hob positioning mechanism for gear hobbing utilizes a detachable structure with a threaded rod and spring-loaded locking rod for the hob, allowing for installation and disassembly without additional tools. This prevents the hob from falling off or loosening. Simultaneously, a second locking cylinder provides auxiliary positioning, ensuring the hob's installation stability. Both gear positioning and hob adjustment are driven by a motor and hydraulic cylinder, resulting in a high degree of automation and shortening clamping and adjustment time. The hob, through the cooperation of the first locking rod and the second locking cylinder, is compatible with the installation of various hob specifications, reducing equipment investment costs. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a side view of the structure of this utility model; Figure 3 This is a schematic diagram of the gear fixing bracket of this utility model; Figure 4 This is an enlarged structural schematic diagram of point A of this utility model; Figure 5 This is a schematic diagram of the structure of the cutting and mounting frame of this utility model; Figure 6 This is a schematic diagram of the rotating frame of this utility model; Figure 7 This is an enlarged structural schematic diagram of section B of this utility model; Figure 8 This is a schematic diagram of the side structure of the rotating frame of this utility model; Figure 9 This is an enlarged structural diagram of point C in this utility model; Figure 10 This is an enlarged structural schematic diagram of point D in this utility model; Figure 11 This is a schematic diagram of the structure of the snap-fit cylindrical rod of this utility model.
[0015] In the diagram: 1. Mounting bracket; 2. Cutting mounting bracket; 3. Gear fixing bracket; 4. First hydraulic cylinder; 5. Transverse sliding groove; 6. Sliding block; 7. First motor; 8. Rotating cylindrical rod; 9. Rotating plate; 10. Second hydraulic cylinder; 11. First circular rotating plate; 13. Fixed circular frame; 14. Eccentric groove; 15. Sliding groove; 16. Snap-fit sliding block; 17. Sliding cylinder; 18. Abutment plate; 19. Third hydraulic cylinder; 20. Sliding frame; 21. Second 21. Motor; 22. Rotating frame; 23. Third motor; 24. Hob; 25. First locking rod; 26. First mounting plate; 27. Second circular rotating plate; 28. First locking cylinder; 29. Threaded rod; 30. First spring; 31. Second locking rod; 32. Second mounting plate; 33. Second locking cylinder; 34. Second spring; 35. Third locking rod; 36. Locking cylinder rod; 37. Pressing cylinder rod; 38. Gear to be processed; 39. Locking hole. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0017] Please see Figures 1 to 11A hob positioning mechanism for gear hobbing includes a mounting frame 1, a cutting mounting frame 2 mounted on the top of the mounting frame 1, a rotating frame 22 disposed outside the cutting mounting frame 2, a detachable hob 24 mounted inside the rotating frame 22, a second circular rotating plate 27 rotatably connected to the inner wall of the rotating frame 22, a detachable first mounting plate 26 threadedly connected to the end of the second circular rotating plate 27, a second locking rod 31 symmetrically slidably connected inside the second circular rotating plate 27 that can extend into and engage with the first mounting plate 26, a first locking rod 25 fixedly connected to the outside of the first mounting plate 26, the hob 24 being engaged with the outside of the first locking rod 25, a second mounting plate 32 slidably connected to the outside of the rotating frame 22, a second locking cylinder 33 rotatably connected to the outside of the second mounting plate 32, and the second locking... The cylindrical rod 33 can be engaged with the end of the first locking rod 25. A third locking rod 35 is symmetrically slidably connected inside the rotating frame 22. A locking cylindrical rod 36 that can extend into and engage with the second mounting plate 32 is fixedly connected to the outside of the third locking rod 35. By threading the first mounting plate 26 onto the first locking cylinder 28, the second locking rod 31 is inserted into the locking hole 39 of the first mounting plate 26 for limiting. The hob 24 can be sleeved on the outside of the first locking rod 25. Pressing the cylindrical rod 37 causes the third locking rod 35 to slide. After aligning the locking cylindrical rod 36 with the slot of the second mounting plate 32, the press is released, and the locking cylindrical rod 36 is locked and fixed to the second mounting plate 32 to prevent the hob 24 from falling off and loosening. The rotation of the second circular rotating plate 27 is used to realize the rotation of the hob 24.
[0018] Please see Figures 1 to 3 The top of the mounting frame 1 is provided with a transverse sliding groove 5, and a sliding block 6 is slidably connected in the transverse sliding groove 5. A first hydraulic cylinder 4 is installed at the bottom of the mounting frame 1. The output shaft of the first hydraulic cylinder 4 is fixedly connected to the sliding block 6. By driving the first hydraulic cylinder 4, the sliding block 6 can be driven to slide along the transverse sliding groove 5, thereby driving the gear 38 to be processed to move.
[0019] Please see Figures 1 to 4A gear fixing frame 3 is fixedly connected to the top of the sliding block 6. A first motor 7 is installed on the top of the sliding block 6 and inside the gear fixing frame 3. The output shaft of the first motor 7 is connected to a rotating cylindrical rod 8. A rotating plate 9 is fixedly connected to the top of the rotating cylindrical rod 8. A first circular rotating plate 11 is rotatably connected to the top of the rotating plate 9. A fixed circular frame 13 is fixedly connected to the top of the rotating plate 9 at the center position of the first circular rotating plate 11. A second hydraulic cylinder 10 is rotatably connected to the top of the rotating plate 9. The output end of the second hydraulic cylinder 10 is rotatably connected to the bottom edge of the first circular rotating plate 11. By driving the first motor 7, the rotating plate 9 can be rotated, thereby driving the gear 38 to be processed, which is locked to the outside of the abutment plate 18, to rotate, so as to adjust the position of the gear to be processed. The second hydraulic cylinder 10 can drive the first circular rotating plate 11 to rotate, so as to realize the radial movement of the abutment plate 18 to lock the gear 38 to be processed.
[0020] Please see Figures 1 to 4 The top of the first circular rotating plate 11 is provided with multiple eccentric grooves 14. The outer side of the fixed circular frame 13 is provided with multiple sliding grooves 15, and the sliding grooves 15 correspond to the positions of the eccentric grooves 14. Each sliding groove 15 is slidably connected with a snap-fit sliding block 16. The bottom of the snap-fit sliding block 16 is fixedly connected with a sliding cylinder 17, and the sliding cylinder 17 is slidably connected with the corresponding eccentric groove 14. The top of the snap-fit sliding block 16 is fixedly connected with an abutment plate 18. The outer side of the abutment plate 18 can be sleeved and clamped to hold the gear 38 to be processed. The outer side wall of the abutment plate 18 is provided with a magnetic adsorption layer. The magnetic adsorption layer is adsorbed and snapped with the inner side wall of the gear 38 to be processed. By rotating the first circular rotating plate 11, the eccentric grooves 14 drive the sliding cylinder 17 and the snap-fit sliding block 16 to move along the sliding grooves 15, so that the abutment plate 18 moves radially synchronously and fits against the inner wall of the gear 38 to be processed. The magnetic adsorption layer on the outer side of the abutment plate 18 completes the double fixation.
[0021] Please see Figures 1 to 5 A third hydraulic cylinder 19 is installed at the bottom of the cutting mounting frame 2. The output end of the third hydraulic cylinder 19 is fixedly connected to a sliding frame 20. A second motor 21 is installed at the end of the sliding frame 20. The output shaft of the second motor 21 passes through the sliding frame 20 and is connected to the rotating frame 22. By driving the third hydraulic cylinder 19, the sliding frame 20 is driven to slide vertically. In conjunction with the second motor 21, the rotating frame 22 is driven to rotate, thereby realizing the height adjustment and angle adjustment of the hob 24.
[0022] Please see Figures 1 to 7A third motor 23 is installed at the end of the rotating frame 22. The output shaft of the third motor 23 passes through the rotating frame 22 and is connected to the second circular rotating plate 27. A first snap-fit cylinder 28 is fixedly connected to the center of the end of the second circular rotating plate 27. A threaded rod 29 is threadedly connected inside the first snap-fit cylinder 28. The end of the threaded rod 29 is fixedly connected to the first mounting plate 26. The threaded rod 29 is threadedly installed on the first snap-fit cylinder 28. By driving the third motor 23, the second circular rotating plate 27 can be rotated to realize the rotation of the first mounting plate 26.
[0023] Please see Figures 1 to 11 The second circular rotating plate 27 has symmetrical square grooves at its ends. A first spring 30 is fixedly connected in each square groove. The end of the first spring 30 is fixedly connected to the second locking rod 31. The second locking rod 31 is slidably connected to the square groove. The first mounting plate 26 has a locking hole 39 on its outside. The second locking rod 31 can be inserted into the locking hole 39 for locking. The elastic force of the first spring 30 pushes the second locking rod 31 into the locking hole 39 for limiting. The roller cutter 24 can be sleeved on the outside of the first locking rod 25 to prevent the roller cutter 24 from falling off and loosening.
[0024] Please see Figures 1 to 11 The rotating frame 22 has a concave groove at its end, and a second spring 34 is symmetrically fixedly connected in the concave groove. The end of the second spring 34 is fixedly connected to the third snap-fit rod 35, and the third snap-fit rod 35 is slidably connected to the concave groove. The end of the third snap-fit rod 35 is fixedly connected to a pressing cylindrical rod 37, which extends into the rotating frame 22 and is slidably connected to it. The edge of the second mounting plate 32 has a slot that matches the snap-fit cylindrical rod 36. The snap-fit cylindrical rod 36 can extend into the slot and snap into the second mounting plate 32. Pressing the pressing cylindrical rod 37 causes the third snap-fit rod 35 to slide, and the second spring 34 is compressed synchronously, moving the second mounting plate 32 to a designated position so that the snap-fit cylindrical rod 36 is aligned with the slot. Then, the pressing is released, and the second spring 34 rebounds, causing the snap-fit cylindrical rod 36 to snap into and fix with the second mounting plate 32, and assisting the positioning of the roller cutter 24 in conjunction with the second snap-fit cylindrical rod 33.
[0025] In summary, this hob positioning mechanism for gear hobbing operates by first fitting the gear 38 to be processed onto the outside of multiple abutment plates 18 outside the fixed circular frame 13. The second hydraulic cylinder 10 extends, driving the first circular rotating plate 11 to rotate around its connection point with the rotating plate 9. The eccentric groove 14 guides the sliding cylinder 17 and the locking sliding block 16 to move radially along the sliding groove 15, causing the abutment plates 18 to move radially synchronously and fit against the inner wall of the gear 38. This, combined with the magnetic adsorption layer on the outside of the abutment plates 18, completes double fixing. The hob 24 is then fitted onto the outside of the first locking rod 25, and the first mounting plate 26 is threadedly connected to the first locking cylinder 28 via the threaded rod 29. The mechanism is then secured by a first spring. 30 pushes the second locking rod 31 into the locking hole 39 for limiting, and at the same time fixes the second mounting plate 32 by pressing the cylindrical rod 37, the third locking rod 35 and the second spring 34, and uses the second locking cylinder 33 to assist in positioning the hob 24; then the first hydraulic cylinder 4 pushes the sliding block 6 to adjust the lateral position of the gear 38 to be processed along the transverse sliding groove 5, the third hydraulic cylinder 19 pushes the sliding frame 20 to adjust the vertical height of the hob 24, the first motor 7 is started to drive the gear 38 to be processed to rotate, the second motor 21 adjusts the angle of the hob 24, and the third motor 23 drives the hob 24 to rotate at high speed to achieve gear hobbing. After processing, the gear to be processed and the hob can be disassembled by reversing the above operations, and then all components are reset.
[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. Moreover, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A hob positioning mechanism for gear hobbing, comprising a mounting frame (1), a cutting mounting frame (2) mounted on the top of the mounting frame (1), a rotating frame (22) disposed outside the cutting mounting frame (2), and a detachable hob (24) mounted inside the rotating frame (22), characterized in that... The inner wall of the rotating frame (22) is rotatably connected to a second circular rotating plate (27). The end of the second circular rotating plate (27) is threadedly connected to a detachable first mounting plate (26). A second locking rod (31) is symmetrically slidably connected inside the second circular rotating plate (27), extending into and engaging with the first mounting plate (26). A first locking rod (25) is fixedly connected to the outside of the first mounting plate (26). The hobbing cutter (24) is engaged with the first locking rod (25). Externally, the rotating frame (22) is slidably connected to a second mounting plate (32), and the second mounting plate (32) is rotatably connected to a second snap-fit cylinder (33). The second snap-fit cylinder (33) can be snapped and adapted to the end of the first snap-fit rod (25). The rotating frame (22) is symmetrically slidably connected to a third snap-fit rod (35). The third snap-fit rod (35) is fixedly connected to a snap-fit cylinder rod (36) that can extend into the second mounting plate (32) and snap-fit thereto.
2. The hob positioning mechanism for gear hobbing according to claim 1, characterized in that: The top of the mounting bracket (1) is provided with a transverse sliding groove (5), and a sliding block (6) is slidably connected in the transverse sliding groove (5). A first hydraulic cylinder (4) is installed at the bottom of the mounting bracket (1), and the output shaft of the first hydraulic cylinder (4) is fixedly connected to the sliding block (6).
3. The hob positioning mechanism for gear hobbing according to claim 2, characterized in that: A gear fixing frame (3) is fixedly connected to the top of the sliding block (6). A first motor (7) is installed on the top of the sliding block (6) and inside the gear fixing frame (3). The output shaft of the first motor (7) is connected to a rotating cylindrical rod (8). A rotating plate (9) is fixedly connected to the top of the rotating cylindrical rod (8). A first circular rotating plate (11) is rotatably connected to the top of the rotating plate (9). A fixed circular frame (13) is fixedly connected to the top of the rotating plate (9) at the center position of the first circular rotating plate (11). A second hydraulic cylinder (10) is rotatably connected to the top of the rotating plate (9). The output end of the second hydraulic cylinder (10) is rotatably connected to the bottom edge of the first circular rotating plate (11).
4. The hob positioning mechanism for gear hobbing according to claim 3, characterized in that: The top of the first circular rotating plate (11) is provided with multiple eccentric grooves (14), and the outside of the fixed circular frame (13) is provided with multiple sliding grooves (15), and the sliding grooves (15) correspond to the positions of the eccentric grooves (14). Each sliding groove (15) is slidably connected with a snap-fit sliding block (16). The bottom of the snap-fit sliding block (16) is fixedly connected with a sliding cylinder (17), and the sliding cylinder (17) is slidably connected with the corresponding eccentric groove (14). The top of the snap-fit sliding block (16) is fixedly connected with an abutment plate (18). The outside of the abutment plate (18) can be sleeved to hold the gear (38) to be processed. The outer side wall of the abutment plate (18) is provided with a magnetic adsorption layer, which is adsorbed and snapped with the inner side wall of the gear (38) to be processed.
5. A hob positioning mechanism for gear hobbing according to claim 4, characterized in that: The inner bottom of the cutting mounting bracket (2) is equipped with a third hydraulic cylinder (19), and the output end of the third hydraulic cylinder (19) is fixedly connected to a sliding frame (20). The end of the sliding frame (20) is equipped with a second motor (21), and the output shaft of the second motor (21) passes through the sliding frame (20) and is connected to the rotating frame (22).
6. The hob positioning mechanism for gear hobbing according to claim 5, characterized in that: A third motor (23) is installed at the end of the rotating frame (22). The output shaft of the third motor (23) passes through the rotating frame (22) and is connected to the second circular rotating plate (27). A first snap-fit cylinder (28) is fixedly connected to the center of the end of the second circular rotating plate (27). A threaded rod (29) can be threadedly connected inside the first snap-fit cylinder (28). The end of the threaded rod (29) is fixedly connected to the first mounting plate (26).
7. A hob positioning mechanism for gear hobbing according to claim 6, characterized in that: The second circular rotating plate (27) has square grooves symmetrically opened at its ends. A first spring (30) is fixedly connected in each square groove. The end of the first spring (30) is fixedly connected to the second snap-fit rod (31). The second snap-fit rod (31) is slidably connected to the square groove. The first mounting plate (26) has snap-fit holes (39) on its outside. The second snap-fit rod (31) can be inserted into the snap-fit holes (39) for snap-fit.
8. A hob positioning mechanism for gear hobbing according to claim 7, characterized in that: The rotating frame (22) has a concave groove at its end. A second spring (34) is symmetrically fixedly connected in the concave groove. The end of the second spring (34) is fixedly connected to a third locking rod (35). The third locking rod (35) is slidably connected to the concave groove. A pressing cylindrical rod (37) is fixedly connected to the end of the third locking rod (35). The pressing cylindrical rod (37) extends into the rotating frame (22) and is slidably connected to it. The edge of the second mounting plate (32) has a slot that matches the locking cylindrical rod (36). The locking cylindrical rod (36) can extend into the slot and lock with the second mounting plate (32).