A hobbing machine deburring center hole precision positioning tool structure

Abstract

The present application relates to the technical field of polishing equipment, and particularly relates to a hobbing machine burr center hole precision positioning tool structure, aiming at the deficiency of the prior art, providing a hobbing machine burr center hole precision positioning tool structure, which comprises a polishing box, the bottom of the polishing box is provided with a polishing table capable of being overturned, the upper end of the polishing table is provided with a positioning tool, the positioning tool comprises a driving cylinder capable of rotating, the upper end of the driving cylinder is provided with a cross seat, the upper end of the cross seat is provided with a plurality of expansion supports, the upper end of the cross seat is also provided with a threaded rod capable of rotating, when the threaded rod rotates, the plurality of expansion supports can move outward, when the polishing table is overturned downward, the expansion supports can also move inward and quickly reset; the tool can automatically reset synchronously with the action of the polishing table being overturned downward to unload, accurately return to the initial working state, and the tool structure does not need to be manually adjusted by artificial means, and the quick disassembly and material taking of the polished gear can be directly completed.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment technology, and in particular to a precision positioning fixture structure for the deburring center hole of a gear hobbing machine. Background Technology

[0002] Gear hobbing machines are core equipment in gear processing. After gear hobbing, burrs remain on the tooth ends, requiring a specialized positioning fixture to clamp and fix the gear before deburring and grinding. Currently, the conventional positioning fixture design for the deburring center hole on gear hobbing machines is quite traditional. The overall structure is separate from the grinding table, only capable of positioning and clamping during gear processing. After deburring and grinding, traditional fixtures cannot automatically release or reset the gear. Operators must use secondary control fixtures, auxiliary tools, or manually adjust the fixture structure to disassemble and remove the ground gear. This operation mode increases the number of processing steps, making loading and unloading cumbersome and extending the processing cycle per workpiece. This significantly reduces the overall efficiency of gear deburring. Furthermore, frequent manual disassembly increases labor intensity, making it difficult to meet the production demands of automated batch gear processing and exhibiting significant technical limitations. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a precision positioning fixture structure for the deburring center hole of a gear hobbing machine. The fixture can automatically reset synchronously with the downward flipping and unloading action of the grinding table, accurately returning to the initial working state. It can directly complete the rapid disassembly and unloading of the gear after grinding without the need for secondary control fixtures or manual adjustment of the fixture structure, effectively solving the problems mentioned in the background technology.

[0004] The technical solution adopted by the present invention to solve the above problems is as follows: A precision positioning fixture structure for the deburring center hole of a gear hobbing machine includes a grinding box. The bottom of the grinding box is provided with a rotating grinding table, and the upper part of the grinding table is provided with a positioning fixture. The positioning fixture includes a rotatable drive cylinder, and the upper end of the drive cylinder is provided with a cross seat. The upper end of the cross seat is provided with multiple expansion seats, and the upper end of the cross seat is also provided with a rotatable threaded rod. When the threaded rod rotates, it can cause the multiple expansion seats to move outward. When the grinding table is flipped downward, the expansion seats can move inward and quickly reset.

[0005] A rotary motor is fixedly connected to the lower surface of the grinding table, a drive cylinder is fixedly connected to the output end of the rotary motor, the drive cylinder is rotatably connected to the inner wall of the grinding table, and a cross seat is fixedly connected to the upper surface of the drive cylinder.

[0006] A clamping motor is fixedly connected to the inner wall of the drive cylinder, and a threaded rod is fixedly connected to the output end of the clamping motor. Two long guide rods are fixedly connected to the inner wall of the cross seat. A clamping seat is fitted on the outer surface of the threaded rod, and two ear plates are provided on the outer surface of the clamping seat. The ear plates are slidably connected to the outer surface of the corresponding long guide rod.

[0007] Multiple evenly distributed expansion rods are hinged to the outer surface of the clamping seat. The expansion seats are all slidably connected to the inner wall of the cross seat, and the upper ends of the expansion rods are all hinged to the inner end face of the corresponding expansion seat.

[0008] The inner wall of the clamp is slidably connected with multiple square sliders. The upper end of each square slider is fixed with an incomplete threaded block that mates with the threaded rod. The lower end of each square slider is fixed with a movable third sliding pin. The outer surface of the long guide rod is fitted with a tension spring that mates with the ear plate.

[0009] The lower end of the clamp is provided with a rotatable drive disk, and the drive disk has multiple variable diameter grooves that cooperate with the third sliding pin.

[0010] A spur gear is fixedly connected to the lower end of the drive disk, and a spur rack that meshes with the spur gear is slidably connected to the lower end of the clamp.

[0011] A sleeve is fixedly connected to one end face of the spur rack, and a vertical guide rod is slidably connected to the inner wall of the cross seat. The sleeve is sleeved on the outer surface of the vertical guide rod.

[0012] The inner wall of the drive cylinder is slidably connected to an inner circular plate, and a second sliding pin is fixedly connected to the inner wall of the inner circular plate. A guide plate is fixedly connected to the lower end surface of the vertical guide rod. A slanted keyway that cooperates with the second sliding pin is opened on the inner wall of the guide plate. A circular collar is fixedly connected to the outer end of the inner circular plate, and a circular sleeve seat that can move up and down is rotatably connected to the outer surface of the circular collar.

[0013] Both sides of the upper surface of the grinding table are slidably connected to long guide plates, and both sides of the long guide plates are hinged to long connecting rods. The rear ends of the long connecting rods are hinged to the inner wall of the grinding box. Both ends of the round sleeve are fixed with first sliding pins. The inner wall of the long guide plates is provided with an upper horizontal groove and a lower inclined groove that cooperate with the first sliding pins. The grinding table is rotatably connected to the inner wall of the grinding box. Both sides of the grinding box are provided with a rotating motor, and the grinding table is installed at the output end of the rotating motor.

[0014] Compared with the prior art, the present invention has the following advantages: When the precision positioning fixture for the deburring center hole of this gear hobbing machine is in operation, the grinding table is rotated upwards to a horizontal working state by a tilting motor. The internal structure of the equipment automatically resets, allowing the incomplete thread block to mesh with the threaded rod. The gear to be processed is then placed on the outside of the expansion seat and on the cross seat. The threaded rod is rotated by the clamping motor, causing the clamping seat to move upwards and, with the help of the expansion rod, pushes multiple sets of expansion seats outwards to precisely tighten the center hole of the gear for centering and fixing. Then, the drive cylinder, cross seat, and gear are rotated synchronously by a rotary motor, working in conjunction with the grinder in the grinding box to complete the final process. The gear teeth are deburred and polished from all sides. After polishing, the polishing table flips down and opens. The mechanical linkage structure consisting of a long connecting rod and a long guide plate drives the sliding pins, guide rods, and drive disc to disengage the incomplete threaded block from the threaded rod. The clamp quickly resets under the tension of the tension spring, causing the expansion support to retract inward to release the gear fixation, which facilitates the quick disassembly of the finished product. At the same time, the tilted polishing table can automatically pour out the residual polishing debris. The entire process relies on the mechanical action of the equipment to achieve automatic tooling reset and unloading, without the need for manual adjustment and secondary electrical control operation. The tooling features a simple overall process, significantly simplifying gear loading and unloading procedures and shortening the single processing cycle. It is suitable for continuous batch processing of gears, effectively improving equipment processing capacity. The fully automated clamping, locking, and unloading process greatly reduces manual intervention and avoids problems such as gear collisions and positioning misalignments caused by manual operation, ensuring stable gear processing accuracy and product qualification rate while reducing labor intensity. In addition, the tooling can be directly adapted to the existing grinding table structure of the gear hobbing machine without major modifications to the main equipment. It has the advantages of strong structural stability, wide adaptability, and low maintenance costs, and has good value for mass production and promotion. Attached Figure Description

[0015] Figure 1 This is an isometric view of a precision positioning fixture structure for the deburring center hole of a gear hobbing machine according to the present invention.

[0016] Figure 2 This is a cross-sectional view of the grinding box of a precision positioning fixture structure for deburring the center hole of a gear hobbing machine according to the present invention.

[0017] Figure 3 This is a schematic diagram of gear installation for a precision positioning fixture structure for the deburring center hole of a gear hobbing machine according to the present invention.

[0018] Figure 4 This is a cross-shaped view of a precision positioning fixture structure for the deburring center hole of a gear hobbing machine according to the present invention.

[0019] Figure 5 This is a cross-sectional view of the drive cylinder of a precision positioning fixture structure for the deburring center hole of a gear hobbing machine according to the present invention.

[0020] Figure 6This is a schematic diagram of the installation of the vertical guide rod in a precision positioning fixture structure for the deburring center hole of a gear hobbing machine according to the present invention.

[0021] Figure 7 This is a schematic diagram of the installation of a straight rack in a precision positioning fixture structure for the deburring center hole of a gear hobbing machine according to the present invention.

[0022] Figure 8 This is a schematic diagram of the drive disc installation of a precision positioning fixture structure for the deburring center hole of a gear hobbing machine according to the present invention.

[0023] Figure 9 This is a schematic diagram of the installation of a square slider in a precision positioning fixture structure for the deburring center hole of a gear hobbing machine according to the present invention.

[0024] The following are the labels in the diagram: 1-Grinding box, 3-Grinding table, 4-Tilting motor, 5-Rotating motor, 6-Drive cylinder, 7-Clamping motor, 8-Threaded rod, 9-Long connecting rod, 10-Long guide plate, 11-First sliding pin, 12-Upper horizontal groove, 13-Lower oblique groove, 14-Circular sleeve seat, 15-Circular ring sleeve, 16-Inner circular plate, 17-Guide plate, 18-Oblique keyway, 19-Second sliding pin, 20-Vertical guide rod, 21-Sleeve rod, 22-Straight rack, 23-Straight gear, 24-Drive disc, 25-Third sliding pin, 26-Variable diameter groove, 27-Clamping seat, 28-Incomplete threaded block, 29-Square slider, 30-Expansion rod, 31-Expansion seat, 32-Long guide rod, 33-Tension spring, 34-Ear plate, 35-Cross seat. Detailed Implementation

[0025] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] like Figures 1-9 As shown, the present invention provides a precision positioning fixture structure for the deburring center hole of a gear hobbing machine, including a grinding box 1. The bottom of the grinding box 1 is provided with a rotating grinding table 3. The upper end of the grinding table 3 is provided with a positioning fixture, which includes a rotatable drive cylinder 6. The upper end of the drive cylinder 6 is provided with a cross seat 35. The upper end of the cross seat 35 is provided with multiple expansion seats 31. The upper end of the cross seat 35 is also provided with a rotatable threaded rod 8. When the threaded rod 8 rotates, it can cause the multiple expansion seats 31 to move outward. When the grinding table 3 is flipped downward, the expansion seats 31 can move inward and quickly reset.

[0027] like Figures 1-7As shown, the grinding box 1 is equipped with a grinder, which can grind burrs on gears. The grinder is existing technology and will not be described in detail. The grinding table 3 can be flipped up and down. When flipped up to a horizontal position, the grinder can grind the gears. When the grinding table 3 is flipped down, the bottom of the grinding box 1 can be opened, allowing the debris stored on the grinding table 3 to be poured out and the gears to be quickly disassembled. Through the positioning fixture, drive cylinder 6, cross seat 35, and other components, the gears are... The expansion seats 31 are fitted onto the outer surface of the expansion seat 31 and placed on the cross seat 35. When the threaded rod 8 rotates, multiple expansion seats 31 can move outward, thus expanding and fixing the gear. After fixing the gear, the drive cylinder 6 rotates, which drives the cross seat 35, expansion seats 31, etc. to rotate synchronously, thus driving the gear to rotate. In conjunction with the work of the grinder, the gear tooth surface can be fully ground. After grinding, by driving the grinding table 3 to flip downward, the expansion seats 31 can move inward and quickly return to their original position. This means that the fixed gear is no longer supported, and the ground gear can be disassembled. When the grinding table 3 flips downwards, the debris generated during grinding can be dumped to the outside. The tooling can automatically reset synchronously with the downward unloading action of the grinding table 3, accurately returning to the initial working state. Without the need for secondary control tooling or manual adjustment of the tooling structure, the grinding gear can be quickly disassembled and unloaded directly, simplifying the workpiece loading and unloading process, significantly shortening the operation cycle of a single gear deburring process, and significantly improving the overall grinding efficiency. The tooling achieves automated reset and unloading based on the mechanical action of the grinding table 3, reducing manual intervention, lowering the intensity of manual labor, and avoiding the risks of workpiece collision and positioning misalignment caused by manual disassembly, thus ensuring the gear processing accuracy and product qualification rate. The tooling structure is compatible with the original grinding table 3 structure of the gear hobbing machine, without the need for major modifications to the main body of the equipment. It has strong structural adaptability and high stability, and can effectively adapt to batch and continuous gear processing production scenarios, significantly improving the overall processing capacity of the equipment, and has good promotion and application value.

[0028] A rotary motor 5 is fixedly connected to the lower surface of the grinding table 3, a drive cylinder 6 is fixedly connected to the output end of the rotary motor 5, the drive cylinder 6 is rotatably connected to the inner wall of the grinding table 3, and the cross seat 35 is fixedly connected to the upper surface of the drive cylinder 6.

[0029] like Figure 5 As shown, the rotary motor 5 provides rotational power to the drive cylinder 6. When the rotary motor 5 starts, it can make the drive cylinder 6 and the cross seat 35 rotate. The motor is existing technology and will not be described in detail.

[0030] A clamping motor 7 is fixedly connected to the inner wall of the drive cylinder 6, and a threaded rod 8 is fixedly connected to the output end of the clamping motor 7. Two long guide rods 32 are fixedly connected to the inner wall of the cross seat 35. A clamping seat 27 is sleeved on the outer surface of the threaded rod 8. Two ear plates 34 are provided on the outer surface of the clamping seat 27. The ear plates 34 are slidably connected to the outer surface of the corresponding long guide rod 32.

[0031] like Figures 4-5 As shown, the function of the clamping motor 7 is to provide rotational power for the threaded rod 8. The ear plate 34 can slide up and down on the outer surface of the long guide rod 32, that is, the limiting clamp 27 can only move up and down and cannot rotate.

[0032] Multiple evenly distributed expansion rods 30 are hinged to the outer surface of the clamp 27. The expansion seats 31 are all slidably connected to the inner wall of the cross seat 35, and the upper ends of the expansion rods 30 are all hinged to the inner end face of the corresponding expansion seat 31.

[0033] like Figure 5 As shown, when the clamp 27 moves up or down, it can drive the lower end of the expansion rod 30 to move up and down. The upper end of the expansion rod 30 will then drive the expansion seat 31 to move outward or inward. That is, when the expansion seat 31 moves outward, it expands and fixes the gear. When the expansion seat 31 moves inward, it no longer clamps and fixes the gear.

[0034] The inner wall of the clamp 27 is slidably connected with a plurality of square sliders 29. The upper end of each square slider 29 is fixedly connected with an incomplete threaded block 28 that cooperates with the threaded rod 8. The lower end of each square slider 29 is fixedly connected with a movable third sliding pin 25. The outer surface of the long guide rod 32 is fitted with a tension spring 33 that cooperates with the ear plate 34.

[0035] like Figure 4 and Figures 8-9As shown, the square slider 29 can slide left and right or back and forth on the inner wall of the clamp 27. The incomplete threaded block 28 is fixed to the lower surface of the square slider 29. When the third sliding pin 25 moves, it can drive multiple square sliders 29 and incomplete threaded blocks 28 to move inward or outward. That is, when the incomplete threaded block 28 moves inward, it can engage with the threaded rod 8, and when the incomplete threaded block 28 moves outward, it can disengage from the threaded rod 8. One end of the tension spring 33 is fixed to the lower surface of the ear plate 34, and the other end of the tension spring 33 is fixed to the upper surface of the cross seat 35. The tension spring 33 always exerts a downward pulling force on the ear plate 34, even if the clamp 27 has a downward force under normal conditions. The driving force is as follows: When the incomplete threaded block 28 is engaged with the threaded rod 8 at its innermost end, it can drive the incomplete threaded block 28, the clamp 27, etc. to move upward synchronously when the threaded rod 8 rotates. It also has a self-locking function when the incomplete threaded block 28 is engaged with the threaded rod 8. That is, when the threaded rod 8 does not rotate, the clamp 27 moves upward to the designated position and is in the designated position, and the expansion seat 31 is in a stable expansion state. When the incomplete threaded block 28 moves outward, that is, after disengaging from the threaded rod 8, the clamp 27 can move downward to reset under the tension of the tension spring 33. That is, the clamp 27 moves downward to the bottom position, and the expansion seat 31 moves inward to reset.

[0036] The lower end of the clamp 27 is provided with a rotatable drive disk 24, and the drive disk 24 is provided with a plurality of variable diameter grooves 26 that cooperate with the third sliding pin 25.

[0037] like Figure 8 As shown, the drive disk 24 is rotatably connected to the lower surface of the clamp 27. When the drive disk 24 rotates, it can drive multiple third sliding pins 25, square sliders 29, incomplete thread blocks 28, etc. to move synchronously inward or outward through the engagement of the third sliding pin 25 with the variable diameter groove 26, that is, control the incomplete thread block 28 to engage or disengage with the threaded rod 8.

[0038] A spur gear 23 is fixedly connected to the lower end of the drive disk 24, and a spur rack 22 that meshes with the spur gear 23 is slidably connected to the lower end of the clamp 27.

[0039] like Figure 7 As shown, the lower end of the clamp 27 is provided with two L-shaped rods. The rack 22 can slide left and right on the lower end of the L-shaped rods. That is, the rack 22 is limited to sliding left and right on the lower end of the clamp 27. When the rack 22 moves left and right, it can drive the rack 23, drive disk 24, etc. to rotate through meshing with the spur gear 23, and then drive the incomplete thread block 28 to move inward or outward.

[0040] A sleeve 21 is fixedly connected to one end face of the rack 22, and a vertical guide rod 20 is slidably connected to the inner wall of the cross seat 35. The sleeve 21 is sleeved on the outer surface of the vertical guide rod 20.

[0041] like Figure 7 As shown, the vertical guide rod 20 can slide left and right on the inner wall of the cross seat 35, and the sleeve rod 21 can slide up and down on the outer surface of the vertical guide rod 20. When the clamp 27, spur gear 23, spur rack 22, sleeve rod 21 and the like move up and down, they can always maintain a connection with the vertical guide rod 20. And when the vertical guide rod 20 moves left and right, it can always drive the sleeve rod 21, spur rack 22 and the like to move left and right, thereby driving the incomplete thread block 28 to move inward or outward.

[0042] The inner wall of the drive cylinder 6 is slidably connected to an inner circular plate 16, and a second sliding pin 19 is fixedly connected to the inner wall of the inner circular plate 16. A guide plate 17 is fixedly connected to the lower surface of the vertical guide rod 20. A slanted keyway 18 that cooperates with the second sliding pin 19 is opened on the inner wall of the guide plate 17. A circular collar is fixedly connected to the outer end of the inner circular plate 16, and a circular sleeve seat 14 that can move up and down is rotatably connected to the outer surface of the circular collar.

[0043] like Figures 6-7 As shown, the inner circular plate 16 can slide up and down the inner wall of the drive cylinder 6, and when the drive cylinder 6 rotates, the inner circular plate 16 and the second sliding pin 19 can rotate synchronously with the clamp 27, the cross seat 35, etc., always maintaining a connected state; through the rotational connection between the circular sleeve 15 and the circular sleeve seat 14, when the circular sleeve seat 14 moves up and down, it can drive the circular sleeve 15, the inner circular plate 16, etc. to move up and down synchronously, and the inner circular plate 16 and the circular sleeve 15 can also rotate, the two do not affect each other; when the inner circular plate 16 and the second sliding pin 19 move downwards... During movement, the engagement of the second sliding pin 19 with the oblique keyway 18 drives the vertical guide rod 20, sleeve rod 21, and spur rack 22 to move to the left, thereby driving the spur gear 23 to rotate and the incomplete threaded block 28 to move outward. After the incomplete threaded block 28 moves outward and disengages from the threaded rod 8, the clamp 27, expansion support 31, etc., can move downward to reset under the tension of the tension spring 33. Similarly, when the inner circular plate 16 moves upward to reset, the incomplete threaded block 28 can move inward to re-engage with the threaded rod 8.

[0044] Both sides of the upper surface of the grinding table 3 are slidably connected to long guide plates 10, and both sides of the long guide plates 10 are hinged to long connecting rods 9. The rear ends of the long connecting rods 9 are hinged to the inner wall of the grinding box 1. Both ends of the round sleeve seat 14 are fixedly connected to first sliding pins 11. The inner wall of the long guide plates 10 is provided with upper horizontal grooves 12 and lower inclined grooves 13 that cooperate with the first sliding pins 11. The grinding table 3 is rotatably connected to the inner wall of the grinding box 1. Both sides of the grinding box 1 are provided with rotating motors 4, and the grinding table 3 is installed at the output end of the rotating motors 4.

[0045] like Figure 2 and Figure 4As shown, the long guide plate 10 can slide left and right on the upper surface of the grinding table 3. The output end of the rotating motor 4 is provided with an output shaft, and the grinding table 3 is fixed to the outer surface of the output shaft. When the rotating motor 4 is working, it can drive the grinding table 3 to rotate up and down; the installation and shape of the long connecting rod 9 are as follows. Figure 2 As shown, when the grinding table 3 is flipped down and opened, the long guide plate 10 can move to the right under the hinge limit of the long connecting rod 9. When the long guide plate 10 moves to the right, the first sliding pin 11 can slide from the inner wall of the upper horizontal groove 12 into the inner wall of the lower inclined groove 13 through the engagement of the first sliding pin 11 with the upper horizontal groove 12 and the lower inclined groove 13. That is, the first sliding pin 11, the circular sleeve 14, the inner circular plate 16, etc. can move downward. When the inner circular plate 16 moves downward, it can drive the incomplete thread block 2. When the screw rod 8 moves outward, it disengages from the threaded rod 8, allowing the expansion seat 31 to move inward and stop expanding and fixing the gear, enabling a quick replacement of the new gear. When the grinding table 3 flips upward, the first sliding pin 11 slides from the inner wall of the lower inclined groove 13 into the inner wall of the upper transverse groove 12, allowing the corresponding incomplete threaded block 28 to close inward and stably engage with the threaded rod 8. When the threaded rod 8 rotates, it can drive the expansion seat 31 to move outward again, expanding and fixing the gear once more.

[0046] In use, the present invention is driven by the tilting motor 4 to tilt the grinding table 3 upward to a horizontal working state, and the internal structure of the equipment automatically resets, so that the incomplete thread block 28 meshes with the threaded rod 8. The gear to be processed is sleeved on the outside of the expansion seat 31 and placed on the cross seat 35. The threaded rod 8 is driven to rotate by the clamping motor 7, which drives the clamping seat 27 to move upward and pushes multiple sets of expansion seats 31 outward with the help of the expansion rod 30, accurately tightening the center hole of the gear to complete the centering and fixing. Then, the rotary motor 5 drives the drive cylinder 6, the cross seat 35 and the gear to rotate synchronously, and the grinding device in the grinding box 1 completes the grinding of the gear. All-round deburring and grinding operation on the tooth surface; after grinding, the grinding table 3 flips down and opens. The mechanical linkage structure composed of the long connecting rod 9 and the long guide plate 10 drives the sliding pins, guide rods and drive disk 24 to move together, so that the incomplete thread block 28 disengages from the thread rod 8. The clamp 27 quickly resets under the tension of the tension spring 33, and drives the expansion support 31 to retract inward to release the gear fixation, which facilitates the quick disassembly of the finished product. At the same time, the tilted grinding table 3 can automatically pour out the residual grinding debris. The entire process relies on the mechanical action of the equipment to realize the automatic reset and unloading of the tooling, without the need for manual adjustment and secondary electrical control operation. The tooling features a simple overall process, significantly simplifying gear loading and unloading procedures and shortening the single processing cycle. It is suitable for continuous batch processing of gears, effectively improving equipment processing capacity. The fully automated clamping, locking, and unloading process greatly reduces manual intervention and avoids problems such as gear collisions and positioning misalignments caused by manual operation, ensuring stable gear processing accuracy and product qualification rate while reducing labor intensity. In addition, the tooling can be directly adapted to the existing grinding table structure of the gear hobbing machine without major modifications to the main equipment. It has the advantages of strong structural stability, wide adaptability, and low maintenance costs, and has good value for mass production and promotion.

Claims

1. A precision positioning fixture structure for the deburring center hole of a gear hobbing machine, comprising a grinding box (1), characterized in that: The grinding box (1) is provided with a rotating grinding table (3) at the bottom. The grinding table (3) is provided with a positioning fixture at the top. The positioning fixture includes a rotatable drive cylinder (6). The drive cylinder (6) is provided with a cross seat (35) at the top. The cross seat (35) is provided with multiple expansion seats (31) at the top. The cross seat (35) is also provided with a rotatable threaded rod (8) at the top. When the threaded rod (8) rotates, it can move the multiple expansion seats (31) outward. When the grinding table (3) is rotated downward, the expansion seats (31) can move inward and quickly reset.

2. The precision positioning fixture structure for the deburring center hole of a gear hobbing machine as described in claim 1, characterized in that: A rotary motor (5) is fixedly connected to the lower surface of the grinding table (3), and a drive cylinder (6) is fixedly connected to the output end of the rotary motor (5). The drive cylinder (6) is rotatably connected to the inner wall of the grinding table (3), and the cross seat (35) is fixedly connected to the upper surface of the drive cylinder (6).

3. The precision positioning fixture structure for the deburring center hole of a gear hobbing machine as described in claim 1, characterized in that: The inner wall of the drive cylinder (6) is fixedly connected to a clamping motor (7), and the threaded rod (8) is fixedly connected to the output end of the clamping motor (7). The inner wall of the cross seat (35) is fixedly connected to two long guide rods (32). A clamping seat (27) is sleeved on the outer surface of the threaded rod (8). Two ear plates (34) are provided on the outer surface of the clamping seat (27). The ear plates (34) are slidably connected to the outer surface of the corresponding long guide rod (32).

4. The precision positioning fixture structure for the deburring center hole of a gear hobbing machine as described in claim 3, characterized in that: Multiple evenly distributed expansion rods (30) are hinged to the outer surface of the clamp (27). The expansion seats (31) are all slidably connected to the inner wall of the cross seat (35). The upper ends of the expansion rods (30) are all hinged to the inner end face of the corresponding expansion seats (31).

5. The precision positioning fixture structure for the deburring center hole of a gear hobbing machine as described in claim 3, characterized in that: The inner wall of the clamp (27) is slidably connected with multiple square sliders (29). The upper end of each square slider (29) is fixed with an incomplete thread block (28) that cooperates with the threaded rod (8). The lower end of each square slider (29) is fixed with a movable third sliding pin (25). The outer surface of the long guide rod (32) is fitted with a tension spring (33) that cooperates with the ear plate (34).

6. The precision positioning fixture structure for the deburring center hole of a gear hobbing machine as described in claim 5, characterized in that: The lower end of the clamp (27) is provided with a rotatable drive disk (24), and the drive disk (24) is provided with multiple variable diameter grooves (26) that cooperate with the third sliding pin (25).

7. The precision positioning fixture structure for the deburring center hole of a gear hobbing machine as described in claim 6, characterized in that: The lower end of the drive disk (24) is fixedly connected to a spur gear (23), and the lower end of the clamp (27) is slidably connected to a spur rack (22) that meshes with the spur gear (23).

8. The precision positioning fixture structure for the deburring center hole of a gear hobbing machine as described in claim 7, characterized in that: A sleeve rod (21) is fixedly connected to one end face of the straight rack (22), and a vertical guide rod (20) is slidably connected to the inner wall of the cross seat (35). The sleeve rod (21) is sleeved on the outer surface of the vertical guide rod (20).

9. The precision positioning fixture structure for the deburring center hole of a gear hobbing machine as described in claim 8, characterized in that: The inner wall of the drive cylinder (6) is slidably connected to an inner circular plate (16), and a second sliding pin (19) is fixedly connected to the inner wall of the inner circular plate (16). A guide plate (17) is fixedly connected to the lower surface of the vertical guide rod (20). A slanted keyway (18) that cooperates with the second sliding pin (19) is opened on the inner wall of the guide plate (17). A circular collar is fixedly connected to the outer end of the inner circular plate (16), and a circular sleeve seat (14) that can move up and down is rotatably connected to the outer surface of the circular collar.

10. The precision positioning fixture structure for the deburring center hole of a gear hobbing machine as described in claim 9, characterized in that: The upper surface of the grinding table (3) is slidably connected to both sides of a long guide plate (10), and both sides of the long guide plate (10) are hinged to a long connecting rod (9). The rear end of the long connecting rod (9) is hinged to the inner wall of the grinding box (1). Both sides of the round sleeve seat (14) are fixedly connected to a first sliding pin (11). The inner wall of the long guide plate (10) is provided with an upper horizontal groove (12) and a lower inclined groove (13) that cooperate with the first sliding pin (11). The grinding table (3) is rotatably connected to the inner wall of the grinding box (1). Both sides of the grinding box (1) are provided with a rotating motor (4). The grinding table (3) is installed at the output end of the rotating motor (4).

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