Centering clamp for gear shaping machine

Abstract

The invention discloses a centering clamp for a gear shaping machine, and relates to the technical field of gear shaping machine matched clamps, the centering clamp comprises a supporting table and a clamping jaw chuck mechanism used for clamping and fixing a workpiece, and the clamping jaw chuck mechanism comprises a plurality of clamping blocks synchronously oppositely clamping towards the center; the device further comprises a movable detection mechanism and an auxiliary centering driving mechanism, the movable detection mechanism is installed at the bottom of the supporting table, each clamping block is connected with the movable detection mechanism in a matched mode, and the movable detection mechanism is used for detecting whether radial movement of the clamping blocks is synchronous or not. Whether the distributed clamping blocks move synchronously or not in the radial movement clamping process is detected through the movement detection mechanism, and if it is detected that the distributed clamping blocks do not move synchronously, the auxiliary centering driving mechanism automatically replaces a driving part of an original clamping jaw chuck mechanism to operate through an arranged induction feedback switch; and the correction clamping blocks synchronously run again and clamp the workpiece in a centering manner, so that the subsequent gear shaping machining precision is ensured, and shutdown for maintenance is not needed.

Description

Technical Field

[0001] This invention relates to the technical field of fixtures for gear hobbing machines, and particularly to a centering fixture for gear hobbing machines. Background Technology

[0002] A gear shaper is a metal cutting machine tool specifically designed for processing gears. During the processing, the workpiece to be processed is usually clamped in place by a matching fixture to ensure that the workpiece remains stable during the gear shaper process.

[0003] Currently, the fixtures used in gear hobbing are mainly three-jaw chucks or tensioning sleeves for positioning. Since the workpieces to be clamped are all cylindrical or cylindrical, ordinary chucks need to constantly correct the workpieces during clamping to ensure that the tool and the workpiece are concentric. However, the correction efficiency is relatively low. Therefore, existing technologies also use synchronous drive mechanisms to make the circumferentially distributed clamping bodies of the chuck move synchronously radially for centering and clamping.

[0004] Although existing gear hobbing machines can use synchronous drive mechanisms to simultaneously move all circumferentially distributed clamping bodies radially to achieve centering and clamping when holding workpieces, such as using a conical pressure sleeve to simultaneously compress the circumferentially distributed clamping bodies with inclined surfaces, over time, each compression will cause some wear. For example, due to slight differences in force at different positions, the presence of debris during processing, or slight roundness errors in the workpiece itself, the wear on the driven side of different clamping bodies will be different. Ultimately, this may lead to inconsistent movement of the distributed clamping bodies, making it impossible to center and clamp properly. Existing clamping tools are not convenient to detect this situation and provide feedback alarms, which can easily lead to defective products in subsequent processing. Even if it is detected, the equipment must be stopped, processing stopped, and maintenance performed before it can continue to work. It is impossible to automatically correct the clamping fixtures to correctly clamp and complete the work. Summary of the Invention

[0005] The purpose of this invention is to provide a centering fixture for a gear hobbing machine, so as to solve the technical problem that the existing gear hobbing machine fixtures are not easy to detect fixture failure and cannot automatically recalibrate the fixture.

[0006] The technical problem to be solved by this invention can be achieved through the following technical solution: A centering fixture for a gear hobbing machine includes a support table and a jaw chuck mechanism for clamping and fixing workpieces, the jaw chuck mechanism including a plurality of clamping blocks that synchronously clamp towards the center; and further includes: The system includes a motion detection mechanism and an auxiliary centering drive mechanism. The motion detection mechanism is installed at the bottom of the support platform, and each clamping block is connected to the motion detection mechanism. The motion detection mechanism is used to detect whether the radial movement of each clamping block is synchronized. The motion detection mechanism includes an inductive feedback switch electrically connected to the auxiliary centering drive mechanism. When the motion detection mechanism detects that the radial movement of each clamping block is asynchronous, the inductive feedback switch controls the auxiliary centering drive mechanism to adjust the radial movement of each clamping block to be synchronized.

[0007] Preferably, the gripper chuck mechanism further includes a lifting conical hole pressure sleeve and an inner sleeve. The inner sleeve is fixedly connected to the support platform. The clamping blocks are equidistantly distributed around the inner sleeve in a circumferential direction, and each clamping block slides laterally through the inner sleeve. An outer sleeve is fixedly installed on the support platform. The lifting conical hole pressure sleeve is fitted between the outer sleeve and the inner sleeve, and the lifting conical hole pressure sleeve can move up and down. Each clamping block has a mating inclined surface on the side near the inner wall of the lifting conical hole pressure sleeve.

[0008] Preferably, the mobile detection mechanism includes a lifting rod, a transmission gear set, and a balance lifting plate. A lifting rod is correspondingly provided below each clamping block, and the lifting rod slides longitudinally through the support platform. Each clamping block is connected to its corresponding lifting rod via a set of transmission gears. An elastic telescopic support mechanism is fixedly provided below the support platform, and the balance lifting plate is movably connected to the telescopic end of the elastic telescopic support mechanism via a universal ball joint hinge. The bottom of each lifting rod is attached to the balance lifting plate, and the balance lifting plate is coaxially aligned with the inner sleeve. Multiple curved stop blocks are fixedly connected circumferentially at equal intervals on the balance lifting plate, and the curved stop blocks are correspondingly located on the side of the bottom of the lifting rod near the edge of the balance lifting plate. A sensory feedback switch is installed on the inner wall of each curved stop block.

[0009] Preferably, the transmission gear set includes a transverse rack, a longitudinal rack, and an intermediate gear. The transverse rack is horizontally fixedly connected to the bottom of the corresponding clamping block; the intermediate gear is rotatably connected to the bottom of the inner sleeve; the longitudinal rack is vertically fixedly connected to the top of the lifting rod, and a limit spring is connected between the lifting rod and the support platform; both the transverse rack and the longitudinal rack mesh with the intermediate gear.

[0010] Preferably, the elastic telescopic support mechanism includes an elastic telescopic rod, which is fixedly installed at the bottom of the support platform, and the center of the bottom of the balance lifting plate is movably connected to the telescopic end of the elastic telescopic rod via a universal ball joint hinge.

[0011] Preferably, the gripper chuck mechanism further includes a hydraulic telescopic rod for providing clamping power to the gripper block, the hydraulic telescopic rod being fixedly disposed below the support platform.

[0012] Preferably, the auxiliary centering drive mechanism includes a lifting ring, an electric telescopic stop, an auxiliary lifting linkage mechanism, and an auxiliary top rod; the lifting ring is driven to lift by a hydraulic telescopic rod; multiple sets of electric telescopic stops are provided, and are circumferentially distributed at equal intervals within the inner sidewall of the lifting ring; the electric telescopic stops are distributed correspondingly to the lifting top rods; an auxiliary top rod is provided parallel to one side of each lifting top rod, and multiple guide sleeves are circumferentially fixedly connected to the bottom of the support platform, with the auxiliary top rods correspondingly sliding through the guide sleeves; an auxiliary stop block is fixedly connected to one side of each lifting top rod, which aligns with the bottom of the corresponding auxiliary top rod; each inductive feedback switch is used to control the operation of all the electric telescopic stops; an auxiliary lifting linkage mechanism is provided between each set of electric telescopic stops and the corresponding auxiliary top rod.

[0013] Preferably, the electric telescopic stop includes an electric telescopic rod and an adjusting block. The electric telescopic rod is installed inside the inner ring sidewall of the lifting ring, and the adjusting block is fixedly connected to the telescopic end of the electric telescopic rod.

[0014] Preferably, the auxiliary lifting linkage mechanism includes a connecting guide rail, a linkage slider, a first linkage rod, and a second linkage rod; the connecting guide rail is horizontally fixedly connected to the bottom of the support platform; the linkage slider is slidably connected to the connecting guide rail, and a connecting spring connects the linkage slider and the connecting guide rail; the first linkage rod is tiltably and movably connected to the side of the linkage slider near the electric telescopic stop via a spring-loaded hinge; one end of the second linkage rod is movably connected to the side of the linkage slider near the auxiliary top rod via a hinge, and the other end is tiltably and movably connected to the auxiliary top rod near the top via a hinge.

[0015] Preferably, a removable gasket is installed on the inner wall of the lifting cone hole pressure sleeve.

[0016] The beneficial effects of this invention are: 1. This invention uses a moving detection mechanism to detect whether the distributed clamping blocks move synchronously during radial clamping. If the distributed clamping blocks are detected to be moving asynchronously, the auxiliary centering drive mechanism automatically takes over the drive unit of the original gripper chuck mechanism by relying on the set inductive feedback switch. This corrects the clamping blocks to move synchronously again and center and clamp the workpiece, ensuring the accuracy of subsequent gear hobbing and eliminating the need for machine downtime for maintenance, thus improving processing efficiency.

[0017] 2. This invention uses a lifting conical hole pressure sleeve to lower and press the mating inclined surfaces on each circumferentially equidistantly distributed clamping block. The lateral thrust generated by the inclined surface pressing causes each clamping block to move radially synchronously and clamp the workpiece, thus achieving centered clamping and ensuring effective clamping.

[0018] 3. During the radial movement of the circumferentially distributed clamping blocks in this invention, if the uneven wear of the inner wall of the lifting cone hole pressure sleeve or the inclined surface of the clamping blocks causes asynchronous movement of the distributed clamping blocks, the descent movement of the corresponding lifting rods of each clamping block will also be asynchronous. This will result in an unbalanced force on the balancing lifting plate, causing one side to tend to deflect downwards. At this time, the curved stop block set on the other side will tend to tilt upwards, thus obliquely contacting the side wall of the corresponding lifting rod, causing the lifting rod to be jammed as a whole, thereby stopping the further movement of the clamping blocks in time. At the same time, the feedback switch distributed on the side wall of the curved stop block can generate a feedback start alarm to realize timely shutdown and remind the staff to carry out subsequent maintenance work.

[0019] 4. In this invention, when the curved stop block abuts against the corresponding lifting rod, locking it and pressing the corresponding inductive feedback switch, the hydraulic telescopic rod used to drive the lifting cone hole pressure sleeve retracts and resets. The inductive feedback switch causes the electric telescopic stops distributed in the inner ring of the lifting ring to extend. During the retraction and reset of the hydraulic telescopic rod, it drives the lifting ring to rise synchronously. The rising of the lifting ring then causes the extended electric telescopic stops to rise and press against the corresponding first linkage rod. This causes the first linkage rod, the linkage slider, and the second linkage rod to work together to drive the corresponding auxiliary rod downwards, pressing against the auxiliary stop on the side wall of the corresponding lifting rod. This allows all the lifting rods to descend synchronously. Thus, each lifting rod, through longitudinal rack, intermediate gear, and transverse rack transmission, causes the corresponding released and reset clamping block to re-clamp, facilitating the re-centering and clamping of the workpiece. This eliminates the need to stop the machine and wait for parts replacement, making operation convenient and improving overall processing efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the overall front view of the present invention; Figure 3 This is a schematic diagram of the structure in which the clamping block and the inner sleeve are connected in this invention; Figure 4 This is a schematic cross-sectional view of the clamping block and the lifting cone hole pressure sleeve in this invention. Figure 5 yes Figure 4 A magnified schematic diagram of the partial structure at point A in the middle; Figure 6 This is a schematic diagram of the structure in which the lifting rod, the transverse gear, and the longitudinal rack are connected in this invention. Figure 7 This is a schematic diagram of the structure in which the lifting rod, curved stop block and balance lifting plate are configured in cooperation in this invention; Figure 8This is a schematic diagram of the structure in which the curved surface block and the inductive feedback switch are connected in this invention; Figure 9 This is a schematic diagram of the state in which the locking block of the lifting cone hole pressure sleeve is lifted and disengaged after relative resetting in this invention; Figure 10 yes Figure 9 A magnified schematic diagram of the structure at point B in the middle.

[0021] Explanation of reference numerals in the attached figures: 1. Support platform; 2. Outer sleeve; 3. Lifting cone hole pressure sleeve; 4. Inner sleeve; 5. Clamping block; 6. Hydraulic telescopic rod; 7. Intermediate plate; 8. Elastic telescopic rod; 9. Balance lifting plate; 10. Elastic arc component; 11. Lifting frame; 12. Mating inclined surface; 13. Electric telescopic rod; 14. Adjusting stop; 15. First linkage rod; 16. Linkage slider; 17. Second linkage rod; 18. Auxiliary top rod; 19. Guide sleeve; 20. Lifting top rod; 21. Intermediate gear; 22. Longitudinal rack; 23. Transverse rack; 24. Auxiliary stop; 25. Curved surface stop; 26. Inductive feedback switch; 27. Lifting ring; 28. Connecting guide rail. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0023] like Figures 1-10 As shown, a centering fixture for a gear hobbing machine is used to assist in the machining of inner ring teeth. The workpiece being clamped is a cylindrical body. The fixture includes a support platform 1 and a jaw chuck mechanism for clamping and fixing the workpiece. The jaw chuck mechanism includes multiple clamping blocks 5 that synchronously clamp towards the center, facilitating the centering and clamping of the workpiece, thereby improving the machining accuracy of the gear hobbing. It should be noted that three clamping blocks 5 are preferably provided, forming a three-jaw chuck. The fixture also includes a moving detection mechanism and an auxiliary centering drive mechanism. The moving detection mechanism is installed at the bottom of the support platform 1, and each clamping block 5 is connected to the moving detection mechanism. The moving detection mechanism is used to detect whether the radial movement of each clamping block 5 is synchronous. The moving detection mechanism includes an inductive feedback switch 26 electrically connected to the auxiliary centering drive mechanism. When the moving detection mechanism detects that the radial movement of each clamping block 5 is asynchronous, the inductive feedback switch 26 controls the auxiliary centering drive mechanism to operate, and the auxiliary centering drive mechanism is used to adjust the synchronous radial movement of each clamping block 5.

[0024] In some specific implementation plans, combined with Figures 2 to 4As shown, the gripper chuck mechanism also includes a lifting conical hole pressure sleeve 3 and an inner sleeve 4. The inner sleeve 4 is fixedly connected to the support platform 1. The clamping blocks 5 are equidistantly distributed around the inner sleeve 4, and each clamping block 5 slides laterally through the inner sleeve 4. An outer sleeve 2 is fixedly installed on the support platform 1, and the inner sleeve 4 is hollowly located inside the outer sleeve 2. The lifting conical hole pressure sleeve 3 is fitted between the outer sleeve 2 and the inner sleeve 4. The lifting conical hole pressure sleeve 3 can move up and down, and the inner wall of the lifting conical hole pressure sleeve 3 is a conical hole, i.e., an inclined surface. The inner diameter gradually increases from top to bottom; it should be noted that the outer sleeve 2, inner sleeve 4 and lifting cone hole pressure sleeve 3 are concentrically distributed; each clamping block 5 is provided with a mating inclined surface 12 on the side near the inner wall of the lifting cone hole pressure sleeve 3. When the lifting cone hole pressure sleeve 3 is pressed from top to bottom, its inclined inner wall is simultaneously pressed onto the mating inclined surface 12 of each clamping block 5, so that each clamping block 5 is simultaneously subjected to a transverse pushing force along the radial direction of the inner sleeve 4, which makes it easier for each clamping block 5 to clamp towards the center synchronously, and to center and fix the workpiece.

[0025] In some specific implementation schemes, refer to Figure 4 and Figure 5 As shown, the mobile detection mechanism includes a lifting rod 20, a transmission gear set, and a balance lifting plate 9. Each clamping block 5 has a corresponding lifting rod 20 below it, and the lifting rod 20 slides longitudinally through the support platform 1. Each clamping block 5 is connected to its corresponding lifting rod 20 via a transmission gear set. When the clamping block 5 moves towards the center to clamp, the corresponding lifting rod 20 is driven to descend via the corresponding transmission gear set. The balance lifting plate 9 is positioned below the lifting rod 20, and an elastic telescopic support mechanism is fixedly installed below the support platform 1. The balance lifting plate 9 is connected to the elastic telescopic support mechanism via a universal ball joint hinge. The telescopic end of the support mechanism is movably connected; the bottom of each lifting rod 20 is attached to the balance lifting plate 9, and the balance lifting plate 9 is coaxially aligned with the inner sleeve 4; multiple curved blocks 25 are fixedly connected circumferentially at equal intervals on the balance lifting plate 9, and the curved blocks 25 are correspondingly matched on the side of the bottom of the lifting rod 20 near the edge of the balance lifting plate 9. The curved blocks 25 can be a semi-cylindrical shape and surround a part of the bottom of the lifting rod 20. The two can fit together to a certain extent or leave a small gap; a sensory feedback switch 26 is installed on the inner wall of each curved block 25. A pressure sensor switch can be selected as the sensory feedback switch 26.

[0026] It should be noted that, in order to ensure that the inductive feedback switch 26 installed in the curved stop block 25 at the corresponding position is effectively pressed when the balance lifting plate 9 has a tendency to tilt and swing to one side, multiple switches can be installed on the inner wall of a curved stop block 25, as shown in the reference. Figure 8 As shown.

[0027] In a further specific implementation plan, refer to Figure 5and Figure 6 As shown, the transmission gear set includes a transverse rack 23, a longitudinal rack 22, and an intermediate gear 21. The transverse rack 23 is horizontally fixedly connected to the bottom of the corresponding clamping block 5. Specifically, it is located on the side of the bottom of the clamping block 5 away from the center of the inner sleeve 4, and only the end of the transverse rack 23 away from the center of the inner sleeve 4 is fixedly connected to the clamping block 5. A notch can be opened at the bottom of the inner sleeve 4 to allow the transverse rack 23 sufficient space to move. The intermediate gear 21 is rotatably connected to the bottom of the inner sleeve 4 via a rotating shaft. The longitudinal rack 22 is vertically fixedly connected to the top of the lifting rod 20, and a limit spring is connected between the lifting rod 20 and the support platform 1. Of course, the number of limit springs is not limited to one; multiple springs can be set, and larger-sized springs should be selected as much as possible to ensure that the lifting rod 20 can be normally reset under the action of the limit spring's rebound force, and it can also be linked to the corresponding clamping block 5 to reset. Both the transverse rack 23 and the longitudinal rack 22 mesh with the intermediate gear 21. Here, the intermediate gear 21 can be set as a toothed column, so that it has a certain width to mesh with two racks at the same time.

[0028] When the clamping block 5 moves radially to the middle of the inner sleeve 4, it drives the transverse rack 23 to move synchronously. The transverse rack 23 then drives the intermediate gear 21 to rotate, and the intermediate gear 21 drives the longitudinal rack 22 to descend, thereby driving the lifting rod 20 to descend.

[0029] In a further specific implementation plan, refer to Figure 2 As shown, the elastic telescopic support mechanism includes an elastic telescopic rod 8 and elastic arc components 10. A middle plate 7 is fixedly connected parallel to the bottom of the support platform 1. The elastic telescopic rod 8 is vertically fixed to the middle plate 7 and is fixed to the bottom of the support platform 1 through the middle plate 7. The elastic telescopic rod 8 specifically includes a fixed sleeve and a sliding rod that slides through the fixed sleeve. A compressible spring is connected between the sliding rod and the fixed sleeve. The bottom center of the balance lifting plate 9 is movably connected to the telescopic end of the elastic telescopic rod 8 through a universal ball joint hinge. Multiple elastic arc components 10 are distributed circumferentially at the telescopic end of the elastic telescopic rod 8. The telescopic end of the elastic telescopic rod 8 is also connected to the balance lifting plate 9 through the elastic arc components 10. The elastic arc components 10 can be elastic rubber bodies or curved springs. It should be noted that the force that the elastic telescopic rod 8 can deform under stress is much greater than the force that the elastic arc member 10 can deform under stress. Here, the elastic arc member 10 mainly serves to assist in supporting the balance lifting plate 9, so that it is effectively in a horizontal position. Of course, since the bottom of the evenly distributed lifting rod 20 is in contact with the surface of the balance lifting plate 9, it can still maintain its horizontal position, so the elastic arc member 10 can be omitted.

[0030] When all clamping blocks 5 move radially synchronously to clamp the workpiece, all lifting rods 20 descend synchronously, so that the evenly distributed contact points of the circumferentially distributed balance lifting plate 9 are simultaneously subjected to downward vertical thrust, i.e., force balance, which facilitates downward compression of the elastic telescopic rod 8. At this time, the lifting rod 20 will not excessively squeeze the inner wall of the corresponding curved stop 25, i.e., the inductive feedback switch 26 will not be activated. If the wear of the inner wall of the lifting cone hole pressure sleeve 3 and the mating inclined surface 12 of each clamping block 5 is inconsistent, the clamping movement of the distributed clamping blocks 5 will not be synchronized. In this case, one of the lifting rods 20 will inevitably have a downward movement tendency first, which will cause the balance lifting plate 9 to be unbalanced in force. The side that is pushed first will have a downward tilting tendency. At this time, due to the presence of the curved stop 25, the curved stop 25 on the side of the balance lifting plate 9 that has a tilting tendency will press against the side wall of the corresponding lifting rod 20. At this time, due to the unbalanced force on the balance lifting plate 9, it will not be able to effectively squeeze the elastic telescopic rod 8 downward, thus stopping it and preventing the clamping block 5 from moving further.

[0031] It should be noted that, in order to facilitate operators to be informed of the above situation in a timely manner, an alarm that is electrically connected to the induction feedback switch 26 can be installed at a certain position on the outside of the fixture to issue an alarm reminder in a timely manner for subsequent maintenance and handling.

[0032] In some specific implementations, the gripper chuck mechanism also includes a hydraulic telescopic rod 6 for providing clamping power to the gripper blocks 5. The hydraulic telescopic rod 6 can also be fixedly installed below the support platform 1 via the intermediate plate 7, and the telescopic end of the hydraulic telescopic rod 6 is vertically downward. The telescopic end of the hydraulic telescopic rod 6 is fixedly connected to a lifting frame 11, and the lifting frame 11 extends vertically into the interior of the outer sleeve 2 and is fixedly connected to the lifting cone hole pressure sleeve 3, thereby providing clamping power to each gripper block 5 by driving the lifting cone hole pressure sleeve 3 to rise and fall. An auxiliary directional drive mechanism is set at the drive end of the hydraulic telescopic rod 6.

[0033] In some specific implementation schemes, refer to Figure 2 and Figure 5As shown, the auxiliary centering drive mechanism includes a lifting ring 27, an electric telescopic stop, an auxiliary lifting linkage mechanism, and an auxiliary top rod 18. The lifting ring 27 is driven to lift by a hydraulic telescopic rod 6, specifically allowing the lifting ring 27 to be fixedly connected to the lifting frame 11. Multiple sets of electric telescopic stops are provided, and they are circumferentially distributed at equal intervals within the inner ring sidewall of the lifting ring 27. The electric telescopic stops are distributed correspondingly to the lifting top rods 20. Each lifting top rod 20 has an auxiliary top rod 18 arranged parallel to one side. Multiple guide sleeves 19 are circumferentially fixedly connected to the bottom of the support platform 1, and the auxiliary top rods 18 slide through the guide sleeves 19. Each lifting top rod 20 has an auxiliary stop 24 fixedly connected to one side, which aligns with the bottom of the corresponding auxiliary top rod 18. The initial position of the auxiliary stop 24 is in contact with the bottom of the auxiliary top rod 18. Each inductive feedback switch 26 can control the operation of all electric telescopic stops. An auxiliary lifting linkage mechanism is provided between each set of electric telescopic stops and the corresponding auxiliary top rod 18.

[0034] The electric telescopic stop includes an electric telescopic rod 13 and an adjusting block 14. The electric telescopic rod 13 is installed inside the inner ring side wall of the lifting ring 27. Specifically, an installation groove can be opened on the inner ring side wall of the lifting ring 27. The telescopic end of the electric telescopic rod 13 faces the center of the lifting ring 27. The adjusting block 14 is fixedly connected to the telescopic end of the electric telescopic rod 13, so that each inductive feedback switch 26 can be directly electrically connected to all the electric telescopic rods 13.

[0035] In addition, the auxiliary lifting linkage mechanism includes a connecting guide rail 28, a linkage slider 16, a first linkage rod 15, and a second linkage rod 17. The connecting guide rail 28 is horizontally fixed to the bottom of the support platform 1 and is positioned between the corresponding electric telescopic stop and the lifting rod 20. The linkage slider 16 is slidably connected to the connecting guide rail 28, and a connecting spring connects the linkage slider 16 and the connecting guide rail 28. The first linkage rod 15 is tilted and movable on the side of the linkage slider 16 near the electric telescopic stop via a spring-loaded hinge, and the end of the first linkage rod 15 can engage with the lifting rod. The inner sidewall of ring 27 is flush. When the electric telescopic stop is not extended, during the lifting and lowering process of lifting ring 27, there is no interference between the end of the first linkage rod 15 and the inner sidewall of lifting ring 27, only contact and sliding, or a small gap is maintained. One end of the second linkage rod 17 is movably connected to the side of the linkage slider 16 near the auxiliary top rod 18 by a hinge, and the other end is movably connected to the auxiliary top rod 18 near the top by a hinge. The end of the first linkage rod 15 away from the linkage slider 16 and the end of the second linkage rod 17 away from the linkage slider 16 are both inclined downward.

[0036] It should be noted that when the inductive feedback switch 26 generates inductive feedback control, it can also be electrically connected to the control circuit of the hydraulic telescopic rod 6, so that when inductive feedback is generated, it controls the downwardly extending hydraulic telescopic rod 6 to stop extending downward and retract to its original position. Of course, the operator can also manually retract and reset the hydraulic telescopic rod 6 when the alarm sounds.

[0037] When the lifting cone hole pressure sleeve 3 is in its initial position, a certain distance is maintained between its inner inclined wall and the distributed clamping blocks 5. At this time, the lifting ring 27 is attached to the bottom surface of the support platform 1, and the distributed electric telescopic stops are positioned higher than the downward-sloping end of the first linkage rod 15. When the electric telescopic stops are not triggered by the induction feedback switch 26 to extend, there is no interaction between the lifting ring 27 and the first linkage rod 15, and the lifting ring 27 can rise and fall normally with the hydraulic telescopic rod 6. When the hydraulic telescopic rod 6 lowers the lifting cone hole pressure sleeve 3, just as the lifting cone hole pressure sleeve 3 comes into contact with the clamping block 5, the lifting ring 27 lowers with the distributed electric telescopic stops to a position below the inclined end of the first linkage rod 15. When the lifting cone hole pressure sleeve 3 squeezes the distributed clamping blocks 5 to perform a clamping action, if the distributed clamping blocks 5 move asynchronously, the inductive feedback switch 26 will cause all the distributed electric telescopic stops on the lifting ring 27 to operate. The electric telescopic rod 13 in the electric telescopic stops will extend and drive the adjusting stop 14 to extend from the inner ring side wall of the lifting ring 27, and be below the inclined end of the corresponding first linkage rod 15. At this time, the hydraulic telescopic rod 6 retracts, driving the lifting cone hole pressure sleeve 3 to rise and reset. Thus, the distributed clamping blocks 5 are unobstructed in the reset direction, and the corresponding lifting top rod 20 is reset under the action of the set limit spring rebound force, thereby driving the corresponding clamping block 5 to reset to the initial position, that is, to release the workpiece again. During the retraction of the hydraulic telescopic rod 6, it drives the extended adjusting stop 14 to rise through the lifting ring 27. The first linkage rod 15 is pressed upwards, causing it to align with the angle formed between the adjusting block 14 and the inner side wall of the lifting ring 27. The inclined end of the first linkage rod 15 can be spherical. The adjusting block 14 then presses upwards on the first linkage rod 15, causing it to rotate around the angle formed between the adjusting block 14 and the inner side wall of the lifting ring 27. This laterally pushes the linkage slider 16 along the connecting guide rail 28 towards the lifting rod 20. During this sliding motion, the linkage slider 16 pushes the auxiliary rod 18 downwards via the second linkage rod 17. The auxiliary rod 18 then pushes the auxiliary block 24 connected to the side wall of the lifting rod 20 downwards, causing the auxiliary block 24 to lower the corresponding lifting rod 20. This allows all the distributed lifting rods 20 to descend synchronously, facilitating the synchronous movement of the distributed clamping blocks 5 and achieving centering clamping. This provides temporary relief without requiring machine downtime for replacement parts or reprocessing, allowing for maintenance during off-peak hours.

[0038] In some specific implementations, in order to facilitate the maintenance of the lifting cone hole pressure sleeve 3 and the clamping block 5, a removable gasket is installed on the inner wall of the lifting cone hole pressure sleeve 3 and on one side of each clamping block 5 where the mating inclined surface 12 is provided, so as to facilitate maintenance, disassembly and replacement.

[0039] It should be noted that, in order to monitor the clamping force of the fixture, pressure sensors can be installed on the clamping surfaces of each clamping block 5, so that the pressure sensors can be connected to an external data monitoring and control platform to monitor the clamping data in real time.

[0040] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios: First, place the cylindrical workpiece with the internal teeth to be machined inside the inner sleeve 4. Then, activate the hydraulic telescopic rod 6 to extend downwards. The hydraulic telescopic rod 6 then drives the lifting cone hole pressure sleeve 3 to press from top to bottom through the lifting frame 11. During this process, the inclined inner wall of the lifting cone hole pressure sleeve 3 presses against the mating inclined surface 12 of each clamping block 5, so that each clamping block 5 is simultaneously subjected to a lateral pushing force along the radial direction of the inner sleeve 4. This makes it easier for each clamping block 5 to clamp towards the center synchronously, and to center and fix the workpiece.

[0041] Furthermore, when each clamping block 5 moves radially towards the middle of the inner sleeve 4, each clamping block 5 can drive the corresponding transverse rack 23 to move synchronously. The transverse rack 23 then drives the intermediate gear 21 to rotate, and the intermediate gear 21 drives the longitudinal rack 22 to descend, thereby driving the corresponding lifting rod 20 to descend. All the lifting rods 20 descend synchronously, so that the evenly distributed contact points of the circumferentially distributed lifting plate 9 are simultaneously subjected to downward vertical thrust, that is, the forces are balanced, which facilitates the downward compression of the elastic telescopic rod 8. At this time, the lifting rod 20 will not excessively squeeze the inner wall of the corresponding curved stop 25, that is, the induction feedback switch 26 will not be activated, and the clamping operation can be completed normally.

[0042] With prolonged use, the inner wall of the lifting cone hole pressure sleeve 3 and the mating inclined surfaces 12 of each clamping block 5 will experience frictional wear with each use. Furthermore, due to slight differences in force at different locations and factors such as debris encountered during processing or minor roundness errors in the workpiece's dimensions, the wear on the inner wall of the lifting cone hole pressure sleeve 3 and the mating inclined surfaces 12 of each clamping block 5 will be inconsistent. This will cause the clamping movements of the distributed clamping blocks 5 to become asynchronous, resulting in one clamping block 5 exhibiting an initial tendency to move. Consequently, the lifting rod 20 will have an initial tendency to descend, leading to an imbalance in the force on the balance lifting plate 9. The side initially subjected to the thrust will tend to tilt downwards. At this point, due to the presence of curved stop blocks 25... If the pressure is too high, the curved stop 25 on the side of the balance lifting plate 9 that tends to tilt will press against the side wall of the corresponding lifting rod 20. At this time, due to the unbalanced force on the balance lifting plate 9, it cannot effectively push the elastic telescopic rod 8 downward, thus stopping it and preventing the clamping block 5 from moving further. The induction feedback switch 26 distributed on the inner wall of the corresponding curved stop 25 will generate induction feedback when pressed, causing the corresponding alarm to sound. This allows the operator to control the hydraulic telescopic rod 6 to stop extending and retract to reset in time, or directly control the hydraulic telescopic rod 6 to stop extending and retract to reset. In addition, the induction feedback switch 26 causes all the electric telescopic stops distributed on the lifting ring 27 to operate.

[0043] It should be noted that when the lifting cone hole pressure sleeve 3 is in its initial position, its inner inclined wall maintains a certain distance from the distributed clamping blocks 5. At this time, the lifting ring 27 is attached to the bottom surface of the support platform 1, and the distributed electric telescopic stops are positioned higher than the downward-sloping end of the first linkage rod 15. When the hydraulic telescopic rod 6 drives the lifting cone hole pressure sleeve 3 to descend and makes the inner wall of the lifting cone hole pressure sleeve 3 just fit against the mating inclined surface 12 of the clamping block 5, the lifting ring 27 just lowers with the distributed electric telescopic stops to a position lower than the inclined end of the first linkage rod 15. At this time, if the distributed clamping blocks 5 are not properly positioned, the lifting ring 27 will be lowered to a position lower than the inclined end of the first linkage rod 15. When the movement of block 5 is asynchronous, the electric telescopic rod 13 in each group of electric telescopic stops triggered by the induction feedback switch 26 extends and drives the adjusting block 14 to extend from the inner ring side wall of the lifting ring 27 and be below the inclined end of the corresponding first linkage rod 15. At this time, due to the retraction of the hydraulic telescopic rod 6, the lifting cone hole pressure sleeve 3 is lifted and reset. Thus, each clamping block 5 is unobstructed in the reset direction. Thus, the corresponding lifting top rod 20 is reset under the action of the set limit spring rebound force, thereby driving the corresponding clamping block 5 to reset to the initial position, that is, to release the workpiece again. During the retraction of the hydraulic telescopic rod 6, the lifting ring 27 drives the extended adjusting block 14 to rise and press against the inclined end of the corresponding first linkage rod 15. At this time, the inclined end of the first linkage rod 15 is aligned with the angle formed between the adjusting block 14 and the inner ring sidewall of the lifting ring 27. Thus, the adjusting block 14 presses the first linkage rod 15 upward, causing the first linkage rod 15 to rotate around the angle formed between the adjusting block 14 and the inner ring sidewall of the lifting ring 27, and laterally push the linkage slider 16 to slide along the connecting guide rail 28. Near the lifting rod 20, during the sliding process of the linkage slider 16, it pushes the auxiliary rod 18 downward through the second linkage rod 17. The auxiliary rod 18 then pushes the auxiliary stop 24 connected to the side wall of the lifting rod 20 downward, thereby causing the auxiliary stop 24 to drive the corresponding lifting rod 20 to descend. In this way, all the distributed lifting rods 20 can be lowered synchronously, which facilitates the synchronous movement of each clamping block 5 after resetting, achieving centering and clamping. This achieves temporary relief without stopping the machine for inspection and replacement of parts, and maintenance can be carried out during idle time.

[0044] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A centering fixture for a gear hobbing machine, comprising a support table (1) and a jaw chuck mechanism for clamping and fixing workpieces, wherein the jaw chuck mechanism comprises a plurality of clamping blocks (5) that synchronously clamp towards the center; characterized in that, Also includes: The moving detection mechanism and the auxiliary centering drive mechanism are installed at the bottom of the support platform (1), and each of the clamping blocks (5) is connected to the moving detection mechanism. The moving detection mechanism is used to detect whether the radial movement of each clamping block (5) is synchronized. The moving detection mechanism includes an inductive feedback switch (26) electrically connected to the auxiliary centering drive mechanism. When the moving detection mechanism detects that the radial movement of each clamping block (5) is not synchronized, the inductive feedback switch (26) controls the auxiliary centering drive mechanism to adjust the radial movement of each clamping block (5) to be synchronized.

2. The centering fixture for a gear hobbing machine according to claim 1, characterized in that, The gripper chuck mechanism further includes a lifting conical hole pressure sleeve (3) and an inner sleeve (4). The inner sleeve (4) is fixedly connected to the support platform (1). The clamping blocks (5) are equidistantly distributed around the inner sleeve (4) in the circumference, and each clamping block (5) slides laterally through the inner sleeve (4). An outer sleeve (2) is fixedly installed on the support platform (1). The lifting conical hole pressure sleeve (3) is fitted between the outer sleeve (2) and the inner sleeve (4), and the lifting conical hole pressure sleeve (3) can move up and down. Each clamping block (5) has a mating inclined surface (12) on the side near the inner wall of the lifting conical hole pressure sleeve (3).

3. A centering fixture for a gear hobbing machine according to claim 1, characterized in that, The mobile detection mechanism includes a lifting rod (20), a transmission gear set, and a balance lifting plate (9). Each clamping block (5) is provided with a corresponding lifting rod (20) below it, and the lifting rod (20) slides longitudinally through the support platform (1). Each clamping block (5) is connected to the corresponding lifting rod (20) through a set of transmission gears. An elastic telescopic support mechanism is fixedly provided below the support platform (1), and the balance lifting plate (9) is movably connected to the telescopic end of the elastic telescopic support mechanism through a universal ball joint hinge. The bottom of each lifting rod (20) is attached to the balance lifting plate (9), and the balance lifting plate (9) is coaxially aligned with the inner sleeve (4). Multiple curved blocks (25) are fixedly connected circumferentially at equal intervals on the balance lifting plate (9), and the curved blocks (25) are correspondingly located on the side of the bottom of the lifting rod (20) near the edge of the balance lifting plate (9). A sensor feedback switch (26) is installed on the inner wall of each curved block (25).

4. A centering fixture for a gear hobbing machine according to claim 3, characterized in that, The transmission gear set includes a transverse rack (23), a longitudinal rack (22), and an intermediate gear (21). The transverse rack (23) is horizontally fixedly connected to the bottom of the corresponding clamping block (5). The intermediate gear (21) is rotatably connected to the bottom of the inner sleeve (4). The longitudinal rack (22) is vertically fixedly connected to the top of the lifting rod (20), and a limit spring is connected between the lifting rod (20) and the support platform (1). Both the transverse rack (23) and the longitudinal rack (22) mesh with the intermediate gear (21).

5. A centering fixture for a gear hobbing machine according to claim 3, characterized in that, The elastic telescopic support mechanism includes an elastic telescopic rod (8), which is fixedly installed at the bottom of the support platform (1). The center of the bottom of the balance lifting plate (9) is movably connected to the telescopic end of the elastic telescopic rod (8) through a universal ball joint hinge.

6. A centering fixture for a gear hobbing machine according to claim 1, characterized in that, The gripper chuck mechanism also includes a hydraulic telescopic rod (6) for providing clamping power to the clamping block (5), and the hydraulic telescopic rod (6) is fixedly installed below the support platform (1).

7. A centering fixture for a gear hobbing machine according to claim 6, characterized in that, The auxiliary centering drive mechanism includes a lifting ring (27), an electric telescopic stop, an auxiliary lifting linkage mechanism, and an auxiliary top rod (18). The lifting ring (27) is driven to lift by a hydraulic telescopic rod (6). Multiple sets of electric telescopic stops are provided and are circumferentially distributed in the inner ring sidewall of the lifting ring (27). The electric telescopic stops are distributed correspondingly to the lifting top rods (20). An auxiliary top rod (18) is provided parallel to one side of each lifting top rod (20). Multiple guide sleeves (19) are fixedly connected to the bottom of the support platform (1), and the auxiliary top rods (18) slide through the guide sleeves (19). An auxiliary stop (24) is fixedly connected to one side of each lifting top rod (20) and is aligned with the bottom of the corresponding auxiliary top rod (18). Each induction feedback switch (26) is used to control the operation of all the electric telescopic stops. An auxiliary lifting linkage mechanism is provided between each set of electric telescopic stops and the corresponding auxiliary top rod (18).

8. A centering fixture for a gear hobbing machine according to claim 7, characterized in that, The electric telescopic stop includes an electric telescopic rod (13) and an adjusting block (14). The electric telescopic rod (13) is installed inside the inner ring side wall of the lifting ring (27), and the adjusting block (14) is fixedly connected to the telescopic end of the electric telescopic rod (13).

9. A centering fixture for a gear hobbing machine according to claim 7, characterized in that, The auxiliary lifting linkage mechanism includes a connecting guide rail (28), a linkage slider (16), a first linkage rod (15), and a second linkage rod (17); the connecting guide rail (28) is horizontally fixedly connected to the bottom of the support platform (1); the linkage slider (16) is slidably connected to the connecting guide rail (28), and a connecting spring is connected between the linkage slider (16) and the connecting guide rail (28); the first linkage rod (15) is tilted and movablely connected to the side of the linkage slider (16) near the electric telescopic stop via a spring-loaded hinge; one end of the second linkage rod (17) is movablely connected to the side of the linkage slider (16) near the auxiliary top rod (18) via a hinge, and the other end is tilted and movablely connected to the auxiliary top rod (18) near the top via a hinge.

10. A centering fixture for a gear hobbing machine according to claim 2, characterized in that, A removable gasket is installed on the inner wall of the lifting cone hole pressure sleeve (3).

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