An active power-off safety type cylindrical gear grinding machine

Abstract

This invention discloses an active power-off safety type cylindrical gear grinding machine, relating to the field of cylindrical gear machining. It includes a base, with a position drive slide on top of the base. A servo motor and a disc grinding wheel are mounted on the moving end of the position drive slide. A first cylinder is housed within the rotating shaft. The first cylinder is triggered when the disc grinding wheel moves axially. A power-off switch is connected in series in the power supply circuit of the servo motor. This active power-off safety type cylindrical gear grinding machine features an axially slidable plug-in transmission structure combined with a hydraulic telescopic mechanism. In extreme conditions of electrical or transmission component failure, the second cylinder is driven by air pressure to trigger the power-off switch, automatically cutting off the servo motor power supply circuit. The entire process requires no electrical sensors or control system intervention, exhibiting fast response speed, strong anti-interference capability, and forming a complete interlocking protection logic, significantly improving the fault safety level of the grinding machine.

Description

Technical Field

[0001] This invention relates to the technical field of cylindrical gear processing, specifically to an active power-off safety cylindrical gear grinding machine. Background Technology

[0002] Gear grinding machines are widely used in machine shops, mainly to address gear deformation and precision issues. Gear grinding machines using the generating method can be classified by wheel shape into disc wheel grinding machines, conical wheel grinding machines, worm wheel grinding machines, and large flat wheel grinding machines. However, factors such as wheel eccentricity, uneven wheel thickness, spindle imbalance, and coolant adsorption by the grinding wheel can significantly increase vibration. These vibrations not only affect the machining quality of the gear grinding machine but also shorten the lifespan of the spindle and the grinding wheel.

[0003] As disclosed in existing patent 1 (Chinese patent application number CN201210185872.0, application date June 7, 2012), the CNC spiral bevel gear grinding machine has a rotary table that is not filled with oil in the oil bladder between the hydraulic clamping cylinder and the hydraulic clamping cylinder piston when hydraulic clamping is not required. When the movement starts, the torque motor is energized, and the torque motor rotor rotates relative to the torque motor stator. The worktable spindle mandrel, the worktable spindle, the inner ring of the YRT rotary table bearing with steel scale attached, and the hydraulic clamping cylinder spring clamping plate connected to the torque motor rotor all rotate in the same way as the torque motor rotor. The steel scale of the YRT rotary table bearing with steel scale attached is responsible for signal feedback so as to realize the rotational movement and precise positioning function of the precision CNC rotary table.

[0004] As disclosed in existing patent 2 (Chinese patent application number CN202120821723.3, application date April 21, 2021), a safety protection device for a gear saw blade grinding machine uses a C-shaped collecting plate, a horizontal plate, a slider, a first protective door, a second protective door, a magnet, and a lifting handle to block iron filings and splashing cutting fluid generated during gear processing, preventing them from splashing onto the operator. The magnet ensures a tighter seal when the first and second protective doors close, further preventing iron filings and cutting fluid from flying out, thus providing better protection. The lifting handle makes it easier and faster to disassemble the first and second protective doors. The aforementioned safety scheme relies heavily on the proper functioning of electrical and transmission components such as drives, encoders, and couplings. In the event of extreme failures such as drive burnout, encoder failure, or coupling breakage, the motor torque cannot be transmitted to the grinding wheel. The grinding wheel will continue to spin at high speed under the influence of huge rotational inertia. Relying solely on the passive protection of the protective cover cannot resist the safety risks brought about by high-speed inertia. It lacks mechanical backup measures, has insufficient safety redundancy, and poses significant safety hazards.

[0005] Therefore, we propose an active power-off safety type cylindrical gear grinding machine to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide an active power-off safety type cylindrical gear grinding machine to solve the problem that the safety solutions of current disc grinding machines on the market, as mentioned in the background art, are highly dependent on the proper operation of electrical and transmission components such as drivers, encoders, and couplings. Once extreme failures such as driver burnout, encoder failure, or coupling breakage occur, the motor torque cannot be transmitted to the grinding wheel, and the grinding wheel will continue to spin at high speed under the action of huge rotational inertia. Relying solely on the passive protection of the protective cover cannot resist the safety risks brought about by high-speed inertia. There is a lack of mechanical bottom-line protection, insufficient safety redundancy, and significant safety hazards.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an active power-off safety cylindrical gear grinding machine, comprising a base, a position drive slide table on the top of the base, a servo motor and a disc grinding wheel mounted on the moving end of the position drive slide table, a rotating shaft component coaxially fixed to the output end of the servo motor, the rotating shaft component and the disc grinding wheel being an axially slidable plug-in transmission structure; a hydraulic telescopic mechanism is rotatably connected to the end of the disc grinding wheel table away from the rotating shaft component, the hydraulic telescopic mechanism being fixed to the moving end of the position drive slide table and used to drive the disc grinding wheel shaft. The disc grinding wheel is moved to disengage from the transmission connection with the rotating shaft; a brake disc is coaxially fixed to the disc body of the disc grinding wheel, and a brake block is fixed to the moving end of the position drive slide corresponding to the brake disc. When the disc grinding wheel is disengaged from the transmission, the brake disc and the brake block rub against each other to achieve deceleration and braking; a first cylinder is provided inside the rotating shaft, and the first cylinder is triggered when the disc grinding wheel moves axially. The first cylinder is connected to a second cylinder through the rotating disk and the second conveying pipe. A power-off switch is provided to the moving end of the second cylinder, and the power-off switch is connected in series in the power supply circuit of the servo motor.

[0008] Preferably, the rotating shaft has an insertion groove at one end facing the disc-shaped grinding wheel, and the inner wall of the insertion groove has several axially extending limiting grooves evenly distributed along the circumference; the end of the disc-shaped grinding wheel is provided with a limiting protrusion, and the side wall of the limiting protrusion is embedded with a ball, which rolls and fits against the outer surface of the first cylinder.

[0009] Preferably, the first cylinder is fixedly housed at the bottom of the insertion groove, and a stroke limiting block is fixed on the inner wall of the insertion groove. The stroke limiting block abuts against the cylinder end of the first cylinder to limit its axial position. The limiting protrusion end of the disc-shaped grinding wheel abuts against the piston rod end of the first cylinder. When the disc-shaped grinding wheel moves axially, it pushes the piston rod to compress the gas in the cylinder.

[0010] Preferably, the second cylinder is fixedly installed on the outer side of the position drive slide, the second cylinder is provided with a spring, and a lever is fixed to the end of the piston rod of the second cylinder, the lever being directly opposite the operating lever of the power-off switch; the stiffness coefficient of the spring inside the second cylinder is greater than that of the spring inside the first cylinder.

[0011] Preferably, the hydraulic telescopic mechanism includes a docking shaft, a piston square tube, and a fixed horizontal cylinder; one end of the docking shaft is locked to the central shaft end of the disc grinding wheel, and the other end of the docking shaft is rotatably connected to the end of the piston square tube; the piston square tube is slidably and sealed in the inner cavity of the fixed horizontal cylinder, and the fixed horizontal cylinder is fixedly installed on the moving end of the position driving slide; the inner cavity of the fixed horizontal cylinder is connected to the oil tank through a first conveying pipe, and a connecting spring is provided between the piston square tube and the bottom of the fixed horizontal cylinder.

[0012] Preferably, the bottom of the fixed horizontal cylinder is fixedly connected to a connecting plate via a telescopic cylinder. The connecting plate is fixedly installed on the moving end of the position drive slide, so that the fixed horizontal cylinder can synchronously complete the feed displacement with the disc grinding wheel.

[0013] Preferably, a rotating shaft is rotatably mounted on the base, and the rotating shaft is driven to rotate by a drive motor to drive the cylindrical gear body clamped thereon to rotate synchronously; the rotating shaft is provided with a hydraulic expansion clamping assembly for expanding and fixing the cylindrical gear body from the inner hole side.

[0014] Preferably, the hydraulic expansion clamp assembly includes a piston disc, a vertical rod, a connecting shaft, and two sets of extrusion bars; a receiving cylinder is provided inside the rotating shaft, and the receiving cylinder is connected to an oil tank through another set of first delivery pipes; the piston disc is slidably disposed inside the receiving cylinder; the bottom end of the vertical rod is fixed to the center of the top surface of the piston disc, and the top end of the vertical rod extends out of the upper end surface of the rotating shaft; the connecting shaft is horizontally fixed to the top end of the vertical rod, the inner ends of the two sets of extrusion bars are respectively hinged to the two ends of the connecting shaft, and the middle part of the extrusion bars is hinged to the upper side wall of the rotating shaft; a return spring is provided between the top surface of the piston disc and the inner wall of the rotating shaft.

[0015] Preferably, the two sets of extrusion strips are symmetrically distributed about the axial center line of the rotation axis, and the outer end of the extrusion strip is an arc-shaped extrusion surface; the hydraulic oil pushes the piston disc to rise, and the extrusion strip swings outward around the central hinge point, with the arc-shaped extrusion surface abutting against the inner wall of the cylindrical gear body to achieve symmetrical expansion and tightening fixation.

[0016] Preferably, the drive motor is fixedly installed inside the base, and the output shaft of the drive motor is coaxially connected to the bottom of the rotating shaft through a bevel gear set.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This active power-off safety cylindrical gear grinding machine is equipped with an axially sliding plug-in transmission structure combined with a hydraulic telescopic mechanism. Under extreme conditions of electrical or transmission component failure, the disc grinding wheel can be independently driven to move axially by hydraulic power, directly cutting off the transmission connection between the grinding wheel and the servo spindle, thus avoiding abnormal power transmission on the fault side. The synchronously set brake disc and fixed brake block automatically engage with the grinding wheel as it moves, directly consuming the grinding wheel's rotational inertia through friction braking, thus solving the safety hazard of the grinding wheel spinning at high speed under extreme fault conditions. At the same time, the grinding wheel disengagement stroke triggers the cylinder air circuit linkage, and the air circuit pressure transmission drives the second cylinder to trigger the power-off switch, automatically cutting off the servo motor power supply circuit. The response speed is fast, the anti-interference ability is strong, and a complete interlocking protection logic is formed, which greatly improves the fault safety level of the gear grinding machine. 1. Through the linkage structure of the internal housing cylinder, piston disc, vertical rod, and extrusion strips of the rotating shaft, two sets of symmetrically arranged extrusion strips are synchronously driven by hydraulic oil to swing outward, achieving circumferential symmetrical expansion and positioning from the inner wall of the gear. Compared with the traditional external chuck clamping structure, the built-in fixture has high coaxiality and uniform and controllable clamping force, which can effectively avoid gear clamping deformation and ensure the accuracy of gear surface grinding. At the same time, the fixture is integrated into the rotating shaft, which is convenient for the grinding wheel to feed across the entire tooth width. Moreover, the hydraulic drive and the workpiece rotation drive are independent of each other, and the clamping action can be linked with the start and stop of the equipment for high clamping efficiency. By adjusting the hydraulic pressure, it can be adapted to the processing of cylindrical gears with different inner hole specifications, thus broadening its applicability. 2. By precisely controlling the hydraulic oil volume within the fixed cross cylinder, the piston square tube drives the disc-shaped grinding wheel to make minute axial movements, compensating for wear during the grinding process in real time, stabilizing grinding accuracy, and eliminating the need for frequent adjustments to the feed parameters of the position drive slide, simplifying daily processing procedures. Simultaneously, the fixed cross cylinder is fixed to the moving end of the position drive slide via a telescopic cylinder and connecting plate, enabling it to synchronously complete feed displacement with the grinding wheel, always ensuring transmission and braking alignment accuracy. The mechanism has a built-in connecting spring, which automatically resets the grinding wheel after a fault is cleared, quickly restoring normal transmission. The reset is precise and reliable, balancing safety protection under extreme conditions with ease of use in daily processing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention from a bottom view; Figure 3 This is a partial cross-sectional view of the base structure of the present invention; Figure 4 This is a schematic diagram of the main cross-sectional structure of the rotating shaft of the present invention; Figure 5 For the present invention Figure 4Enlarged structural diagram at point A in the middle; Figure 6 This is a schematic diagram of the main structure of the position-driven slide table of the present invention; Figure 7 This is a side view of the disc-shaped grinding wheel structure of the present invention; Figure 8 This is a schematic diagram of the front cross-sectional structure of the fixed cross-section of the present invention; Figure 9 This is a schematic diagram of the main cross-sectional structure of the rotating shaft of the present invention; Figure 10 For the present invention Figure 9 Enlarged structural diagram at point B; Figure 11 This is a schematic diagram of the main structure of the second cylinder of the present invention; Figure 12 This is a schematic diagram of the main cross-section of the second cylinder of the present invention.

[0019] In the diagram: 1. Base; 2. Oil tank; 3. First conveying pipe; 4. Rotating shaft; 41. Receiving cylinder; 5. Drive motor; 51. Bevel gear set; 6. Cylindrical gear body; 7. Piston disc; 8. Vertical rod; 9. Return spring; 10. Connecting shaft; 11. Extrusion bar; 12. Position drive slide; 13. Servo motor; 14. Rotating shaft; 141. Limiting groove; 142. Stroke limit block; 143. First cylinder; 144. Rotating disk; 15. Disc-shaped grinding wheel; 151. Brake disc; 16. Connecting shaft; 17. Piston square tube; 18. Fixed horizontal cylinder; 181. Telescopic cylinder; 182. Connecting plate; 19. Connecting spring; 20. Brake block; 21. Second conveying pipe; 22. Second cylinder; 23. Power off switch. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-12 The present invention provides the following technical solution: Reference Appendix Figure 1 Appendix Figure 2 and attached Figure 6 - Appendix Figure 8An active power-off safety type cylindrical gear grinding machine includes a base 1. A position drive slide 12 is provided on the top of the base 1. A servo motor 13 and a disc grinding wheel 15 are mounted on the moving end of the position drive slide 12. A rotating shaft 14 is coaxially fixed to the output end of the servo motor 13. The rotating shaft 14 and the disc grinding wheel 15 are connected by an axially slidable plug-in transmission structure. A hydraulic telescopic mechanism is rotatably connected to the end of the disc grinding wheel 15 away from the rotating shaft 14. The hydraulic telescopic mechanism is fixed to the moving end of the position drive slide 12 and is used to drive the disc grinding wheel 15 to move axially to disengage from the transmission connection with the rotating shaft 14. The disc body of the disc grinding wheel 15 is coaxial. A brake disc 151 is fixed, and a brake block 20 is fixed to the moving end of the position drive slide 12 corresponding to the brake disc 151. When the disc grinding wheel 15 is disengaged from the transmission, the brake disc 151 and the brake block 20 rub against each other to achieve deceleration and braking. A first cylinder 143 is provided inside the rotating shaft 14. When the disc grinding wheel 15 moves axially, the first cylinder 143 is triggered. The first cylinder 143 is connected to a second cylinder 22 through the rotating disk 144 and the second conveying pipe 21. The rotating disk 144 is rotatably set on the outside of the rotating shaft 14. A power-off switch 23 is provided to the moving end of the second cylinder 22. The power-off switch 23 is connected in series in the power supply circuit of the servo motor 13.

[0022] Under normal processing conditions, the position drive slide 12 moves the servo motor 13 and the disc grinding wheel 15 to the processing station. The torque output by the servo motor 13 is transmitted to the disc grinding wheel 15 through the rotating shaft 14, driving the disc grinding wheel 15 to rotate at high speed to complete the tooth surface grinding. The hydraulic telescopic mechanism maintains the initial extended position, maintaining the transmission engagement state between the disc grinding wheel 15 and the rotating shaft 14. The brake disc 151 and the brake block 20 are in a disengaged state. The first cylinder 143 remains in the initial reset state, the second cylinder 22 is not triggered, the power-off switch 23 remains on, and the servo motor 13 is powered normally. When extreme failures such as driver burnout or coupling breakage occur, the hydraulic telescopic mechanism is activated by hydraulic power, driving the disc grinding wheel 15 axially away from the rotating shaft. The 14 slides in the direction of the shaft, gradually disengaging from the transmission connection with the rotating shaft 14 and cutting off the power transmission from the faulty side to the grinding wheel. The brake disc 151, which moves axially synchronously with the disc grinding wheel 15, gradually approaches and adheres to the brake block 20. The rotational inertia of the disc grinding wheel 15 is directly consumed by the sliding friction resistance, achieving pure mechanical deceleration and braking. At the same time, the axial movement of the disc grinding wheel 15 triggers the first cylinder 143 in the rotating shaft 14. The gas in the cylinder is transmitted to the second cylinder 22 through the air supply pipeline, driving the moving end of the second cylinder 22 to move, triggering the power-off switch 23 to open, cutting off the power supply circuit of the servo motor 13, forming a safe action. The entire process is achieved by mechanical hydraulic linkage, without relying on the electrical detection and control system, and can still be reliably triggered in the case of complete failure of the electrical system.

[0023] Reference Appendix Figure 9 and attached Figure 10 The rotating shaft 14 has an insertion groove at one end facing the disc-shaped grinding wheel 15. The inner wall of the insertion groove has several axially extending limiting grooves 141 evenly distributed circumferentially. The end of the disc-shaped grinding wheel 15 is provided with a limiting protrusion. The side wall of the limiting protrusion is embedded with a ball, which rolls against the outer surface of the first cylinder 143. The first cylinder 143 is fixedly housed in the bottom of the insertion groove. The inner wall of the insertion groove is fixed with a stroke limiting block 142, which abuts against the cylinder end of the first cylinder 143 to limit its axial position. The limiting protrusion end of the disc-shaped grinding wheel 15 abuts against the piston rod end of the first cylinder 143. When the disc-shaped grinding wheel 15 moves axially, it pushes the piston rod to compress the gas in the cylinder.

[0024] Under normal transmission conditions, the limiting protrusion at the end of the disc-shaped grinding wheel 15 extends into the insertion groove of the rotating shaft 14, and the balls on the side wall of the limiting protrusion are embedded in the limiting groove 141, forming a torque transmission pair through circumferential engagement. The power of the servo motor 13 is transmitted to the disc-shaped grinding wheel 15 through the engagement of the rotating shaft 14, the limiting groove 141, and the balls. At the same time, the balls can roll axially along the limiting groove 141, giving the disc-shaped grinding wheel 15 axial sliding freedom to meet the stroke requirements for disengaging the transmission. The first cylinder 143 is axially limited and fixed to the bottom of the insertion groove by the stroke limiting block 142, and the limiting protrusion end of the disc-shaped grinding wheel 15 abuts against the first cylinder. At the piston rod end of cylinder 143, the spring force inside the first cylinder 143 pushes the piston rod to maintain its initial extended state, pre-tightening the disc grinding wheel 15 towards the transmission engagement position. When a fault triggers the disc grinding wheel 15 to move axially toward the bottom of the groove, the limiting protrusion slides axially along the limiting groove 141, simultaneously pushing the piston rod of the first cylinder 143 to retract into the cylinder, compressing the gas inside the cylinder to form a high-pressure air path, providing power for subsequent power-off triggering. The stroke limiting block 142 limits the position of the cylinder body of the first cylinder 143, preventing the first cylinder 143 from being displaced by the force of the push rod, ensuring that the first cylinder 143 does not affect the rotation of the disc grinding wheel 15.

[0025] Reference Appendix Figure 11 and attached Figure 12 The second cylinder 22 is fixedly installed on the outer side of the position drive slide 12. The second cylinder 22 is equipped with a spring inside. The piston rod end of the second cylinder 22 is fixed with a lever, which is directly opposite the operation lever of the power-off switch 23. The spring constant of the second cylinder 22 is greater than the spring constant of the first cylinder 143.

[0026] The high-pressure gas generated by the compression of the first cylinder 143 is delivered to the cylinder chamber of the second cylinder 22 through the gas pipeline. The gas pressure acts on the piston rod of the second cylinder 22, overcoming the elastic force of the internal spring and pushing the piston rod outward. The lever at the end of the piston rod is pressed down, which moves the operating lever of the power-off switch 23, switching the switch from the on state to the off state and cutting off the power supply circuit of the servo motor 13. Since the stiffness coefficient of the spring inside the second cylinder 22 is greater than that of the spring inside the first cylinder 143, the air pressure must first overcome the spring resistance of the first cylinder 143 to complete the braking stroke. After the brake disc 151 and the brake block 20 are reliably in contact, the air pressure rises to the action threshold and pushes the second cylinder 22 to trigger the power-off action, ensuring that the braking action is completed before the power-off action, avoiding the grinding wheel idling without braking constraint after the power is off. When the fault is cleared and the hydraulic power is removed, the spring inside the second cylinder 22 pushes the piston rod to reset, causing the lever to leave the power-off switch 23, and the switch automatically returns to the on state, facilitating the quick restart of the equipment and resumption of production.

[0027] Reference Appendix Figure 7 and attached Figure 8 The hydraulic telescopic mechanism includes a docking shaft 16, a piston square tube 17, and a fixed horizontal cylinder 18. One end of the docking shaft 16 is locked to the central shaft end of the disc grinding wheel 15, and the other end of the docking shaft 16 is rotatably connected to the end of the piston square tube 17. The piston square tube 17 is sealed and slidably disposed in the inner cavity of the fixed horizontal cylinder 18, and the fixed horizontal cylinder 18 is fixedly installed on the moving end of the position drive slide 12. The inner cavity of the fixed horizontal cylinder 18 is connected to the oil tank 2 through the first conveying pipe 3, and a connecting spring 19 is provided between the piston square tube 17 and the bottom of the fixed horizontal cylinder 18. The bottom of the fixed horizontal cylinder 18 is fixedly connected to a connecting plate 182 through a telescopic tube 181, and the connecting plate 182 is fixedly installed on the moving end of the position drive slide 12, so that the fixed horizontal cylinder 18 completes the feed displacement synchronously with the disc grinding wheel 15.

[0028] When the hydraulic telescopic mechanism is working, the hydraulic oil in the oil tank 2 is introduced into the inner cavity of the fixed horizontal cylinder 18 through the first delivery pipe 3. The hydraulic pressure acts on the end face of the piston square tube 17, overcoming the elastic force of the connecting spring 19 and pushing the piston square tube 17 to slide outward along the inner cavity of the fixed horizontal cylinder 18. The piston square tube 17 drives the disc grinding wheel 15 to move axially synchronously through the docking shaft 16, realizing the transmission disengagement and braking trigger action. Since the docking shaft 16 is locked to the disc grinding wheel 15 and rotates to the piston square tube 17, when the disc grinding wheel 15 rotates, it only drives the docking shaft 16 to rotate synchronously. The piston square tube 17 and the fixed horizontal tube 18 remain stationary to avoid rotational friction loss and improve the service life of the mechanism. The bottom of the fixed horizontal tube 18 is connected to the connecting plate 182 through the telescopic tube 181. The connecting plate 182 is fixed to the moving end of the position drive slide 12, so that the entire hydraulic telescopic mechanism can complete the feed displacement synchronously with the disc grinding wheel 15, always maintaining the coaxiality with the disc grinding wheel 15, and ensuring the alignment accuracy of axial transmission and braking. When the hydraulic oil is depressurized, the elastic force of the connecting spring 19 pushes the piston square tube 17 to retract and reset, driving the disc grinding wheel 15 to reconnect to the transmission.

[0029] Reference Appendix Figure 3 A rotating shaft 4 is rotatably mounted on the base 1. The rotating shaft 4 is driven to rotate by a drive motor 5, which drives the cylindrical gear body 6 clamped on it to rotate synchronously. The rotating shaft 4 is equipped with a hydraulic expansion clamp assembly, which is used to expand and fix the cylindrical gear body 6 from the inner hole side. The drive motor 5 is fixedly installed inside the base 1, and the output shaft of the drive motor 5 is coaxially connected to the bottom of the rotating shaft 4 through a bevel gear set 51.

[0030] When the workpiece is rotating, the drive motor 5, which is fixedly installed inside the base 1, starts. The rotational power of the output shaft is transmitted to the bottom of the rotating shaft 4 through the bevel gear set 51, causing the rotating shaft 4 to rotate at a constant speed around its own axial center line. The rotating shaft 4 drives the cylindrical gear body 6 clamped on it to rotate synchronously through the internal hydraulic expansion clamping fixture assembly, so that the tooth surface of the cylindrical gear body 6 and the high-speed rotating disc grinding wheel 15 form a relative generating motion. In conjunction with the feed action of the position drive slide 12, the continuous grinding of the entire tooth surface is completed. The transmission structure of the bevel gear set 51 can convert the lateral power of the drive motor 5 into the longitudinal rotational power of the rotating shaft 4, making full use of the internal space of the base 1 to arrange the drive components, lowering the overall center of gravity of the equipment, and improving the stability during high-speed operation.

[0031] Reference Appendix Figure 4 and attached Figure 5The hydraulic expansion clamp assembly includes a piston disc 7, a vertical rod 8, a connecting shaft 10, and two sets of extrusion bars 11. A receiving cylinder 41 is provided inside the rotating shaft 4. The receiving cylinder 41 is connected to the oil tank 2 through another set of first conveying pipes 3. The piston disc 7 is sealed and slidably disposed inside the receiving cylinder 41. The bottom end of the vertical rod 8 is fixed to the center of the top surface of the piston disc 7, and the top end of the vertical rod 8 extends sealed out of the upper end surface of the rotating shaft 4. The connecting shaft 10 is horizontally fixed to the top end of the vertical rod 8. The inner ends of the two sets of extrusion bars 11 are respectively hinged to the two ends of the connecting shaft 10, and the middle part of the extrusion bars 11 is hinged to the upper side wall of the rotating shaft 4. A return spring 9 is provided between the top surface of the piston disc 7 and the inner wall of the rotating shaft 4.

[0032] When the hydraulic expansion clamp is in operation, the hydraulic oil in the oil tank 2 is introduced into the receiving cylinder 41 inside the rotating shaft 4 through another set of first delivery pipes 3. The hydraulic pressure acts on the bottom surface of the piston disc 7, overcoming the elastic force of the return spring 9 and pushing the piston disc 7 to slide upward along the receiving cylinder 41. The piston disc 7 drives the vertical rod 8 to rise synchronously, and the connecting shaft 10 at the top of the vertical rod 8 moves upward accordingly, pulling the inner ends of the two sets of extrusion strips 11 upward. Since the middle part of the extrusion strip 11 is hinged to the upper side wall of the rotating shaft 4, a lever transmission structure is formed. When the inner end moves upward, the outer end swings outward around the hinge point, and pushes outward from the side of the gear inner hole to abut against the inner wall of the cylindrical gear body 6, realizing the automatic centering and clamping of the gear. When the hydraulic oil is depressurized, the elastic force of the return spring 9 pushes the piston disc 7 to return downward, driving the vertical rod 8 and the connecting shaft 10 to move downward. The outer end of the extrusion strip 11 retracts inward, releasing the expansion and fixing of the cylindrical gear body 6, which facilitates the rapid loading and unloading of the workpiece.

[0033] Reference Appendix Figure 5 Two sets of extrusion strips 11 are symmetrically distributed about the axial center line of the rotating shaft 4, and the outer end of the extrusion strip 11 is an arc-shaped extrusion surface; the hydraulic oil pushes the piston disc 7 to rise, and the extrusion strip 11 swings outward around the central hinge point, and the arc-shaped extrusion surface abuts against the inner wall of the cylindrical gear body 6 to achieve symmetrical expansion and tightening.

[0034] Two sets of extrusion strips 11 are symmetrically arranged about the axial center line of the rotating shaft 4. When clamped, the extrusion strips 11 on both sides swing outward synchronously, and the arc-shaped extrusion surface at the outer end simultaneously fits against the inner wall of the cylindrical gear body 6, forming a symmetrical two-point tightening structure to ensure the coaxiality of the cylindrical gear body 6 and the rotating shaft 4, and avoid the grinding accuracy error of tooth direction and tooth pitch caused by clamping eccentricity; the arc-shaped extrusion surface can increase the contact area with the inner hole of the gear, reduce the pressure per unit area, and avoid scratching the finishing surface of the inner hole.

[0035] Furthermore, during normal grinding, the grinding working surface of the disc grinding wheel 15 continuously contacts and grinds the tooth surface of the cylindrical gear body 6, resulting in progressive axial wear, which leads to a reduction in the axial dimension of the grinding wheel and insufficient grinding feed depth. At this time, a small amount of hydraulic oil is introduced into the inner cavity of the fixed cross cylinder 18 through the hydraulic control system. The hydraulic pressure overcomes the preload of the connecting spring 19 and pushes the piston square tube 17 to slide slightly axially along the inner cavity of the fixed cross cylinder 18 towards the disc grinding wheel 15. The piston square tube 17 drives the disc grinding wheel 15 to feed forward slightly through the docking shaft 16, compensating for the axial dimension loss caused by grinding wheel wear. This compensation stroke is within the limiting groove 141. Within the effective transmission stroke range, the limiting protrusion at the end of the disc grinding wheel 15 is always fitted into the limiting groove 141, and the balls roll synchronously along the groove wall of the limiting groove 141, maintaining a continuous circumferential transmission connection. This prevents the triggering of the first cylinder 143 located at the bottom of the insertion groove. The brake disc 151 and the brake block 20 also remain separated, achieving only precise compensation of the grinding dimensions. The fixed cross cylinder 18 is fixedly connected to the moving end of the position drive slide 12 via the telescopic cylinder 181 and the connecting plate 182. During the compensation process, the entire mechanism synchronously completes the processing feed motion with the disc grinding wheel 15, maintaining coaxial transmission accuracy and stably maintaining the tooth surface grinding depth and processing accuracy.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An active power-off safety type cylindrical gear grinding machine, comprising a base (1), the top of which is provided with a position driving sliding table (12), the moving end of which is provided with a servo motor (13) and a disc-shaped grinding wheel disc (15), the output end of the servo motor (13) is coaxially fixed with a rotating shaft member (14), characterized in that: The rotating shaft (14) and the disc-shaped grinding wheel (15) are axially slidable plug-in transmission structures; the end of the disc-shaped grinding wheel (15) away from the rotating shaft (14) is rotatably connected to a hydraulic telescopic mechanism, which is fixed to the moving end of the position drive slide (12) and is used to drive the disc-shaped grinding wheel (15) to move axially to disengage from the transmission connection with the rotating shaft (14); a brake disc (151) is coaxially fixed to the disc body of the disc-shaped grinding wheel (15), and a brake block (20) is fixed to the moving end of the position drive slide (12) corresponding to the brake disc (151), so that the disc-shaped grinding wheel (15) disengages from the transmission connection. When the brake disc (151) and the brake block (20) are in frictional contact, the deceleration braking is achieved; the rotating shaft (14) is provided with a first cylinder (143), and the first cylinder (143) is triggered when the disc grinding wheel (15) moves axially. The first cylinder (143) is connected to the second cylinder (22) through the rotating disk (144) and the second conveying pipe (21). The rotating disk (144) is rotatably arranged on the outside of the rotating shaft (14), and the moving end of the second cylinder (22) is correspondingly provided with a power-off switch (23). The power-off switch (23) is connected in series in the power supply circuit of the servo motor (13).

2. The active power-off safety type cylindrical gear grinding machine according to claim 1, characterized in that: The rotating shaft (14) has an insertion groove at one end facing the disc-shaped grinding wheel (15). The inner wall of the insertion groove has several axially extending limiting grooves (141) evenly distributed along the circumference. The end of the disc-shaped grinding wheel (15) is provided with a limiting protrusion. The side wall of the limiting protrusion is embedded with a ball, which rolls against the outer surface of the first cylinder (143).

3. A safety through power off type cylindrical gear grinding machine according to claim 2, characterized in that: The first cylinder (143) is fixedly housed at the bottom of the insertion groove. The inner wall of the insertion groove is fixed with a stroke limiting block (142). The stroke limiting block (142) abuts against the cylinder end of the first cylinder (143) to limit its axial position. The limiting protrusion end of the disc-shaped grinding wheel (15) abuts against the piston rod end of the first cylinder (143). When the disc-shaped grinding wheel (15) moves axially, it pushes the piston rod to compress the gas in the cylinder.

4. The active power-off safety type cylindrical gear grinding machine according to claim 1, characterized in that: The second cylinder (22) is fixedly installed on the outer side of the position drive slide (12). The second cylinder (22) is equipped with a spring inside. The piston rod end of the second cylinder (22) is fixed with a lever, which is directly opposite the operation lever of the power-off switch (23). The stiffness coefficient of the reset spring inside the second cylinder (22) is greater than that of the spring inside the first cylinder (143).

5. The active power-off safety type cylindrical gear grinding machine according to claim 1, characterized in that: The hydraulic telescopic mechanism includes a docking shaft (16), a piston square tube (17), and a fixed cross tube (18); one end of the docking shaft (16) is locked to the central shaft end of the disc grinding wheel (15), and the other end of the docking shaft (16) is rotatably connected to the end of the piston square tube (17); the piston square tube (17) is sealed and slidably disposed in the inner cavity of the fixed cross tube (18), and the fixed cross tube (18) is fixedly installed on the moving end of the position drive slide (12); the inner cavity of the fixed cross tube (18) is connected to the oil tank (2) through the first conveying pipe (3), and a connecting spring (19) is provided between the piston square tube (17) and the bottom of the fixed cross tube (18).

6. The active power-off safety type cylindrical gear grinding machine according to claim 5, characterized in that: The bottom of the fixed horizontal cylinder (18) is fixedly connected to a connecting plate (182) via a telescopic cylinder (181). The connecting plate (182) is fixedly installed on the moving end of the position drive slide (12), so that the fixed horizontal cylinder (18) can complete the feed displacement synchronously with the disc grinding wheel (15).

7. The active power-off safety type cylindrical gear grinding machine according to claim 1, characterized in that: A rotating shaft (4) is rotatably mounted on the base (1). The rotating shaft (4) is driven to rotate by a drive motor (5) to drive the cylindrical gear body (6) clamped on it to rotate synchronously. A hydraulic expansion clamp assembly is provided inside the rotating shaft (4) to expand and fix the cylindrical gear body (6) from the inner hole side.

8. The active power-off safety type cylindrical gear grinding machine according to claim 7, characterized in that: The hydraulic expansion clamp assembly includes a piston disc (7), a vertical rod (8), a connecting shaft (10), and two sets of extrusion bars (11); a receiving cylinder (41) is provided inside the rotating shaft (4), and the receiving cylinder (41) is connected to the oil tank (2) through another set of first delivery pipes (3). The piston disc (7) is sealed and slidably disposed inside the receiving cylinder (41); the bottom end of the vertical rod (8) is fixed to the center of the top surface of the piston disc (7), and the top end of the vertical rod (8) is sealed and extends out of the upper end surface of the rotating shaft (4); the connecting shaft (10) is horizontally fixed to the top end of the vertical rod (8), and the inner ends of the two sets of extrusion bars (11) are respectively hinged to the two ends of the connecting shaft (10), and the middle part of the extrusion bars (11) is hinged to the upper side wall of the rotating shaft (4); a return spring (9) is provided between the top surface of the piston disc (7) and the inner wall of the rotating shaft (4).

9. The active power-off safety type cylindrical gear grinding machine according to claim 8, characterized in that: The two sets of extrusion strips (11) are symmetrically distributed about the axial center line of the rotating shaft (4). The outer end of the extrusion strip (11) is an arc-shaped extrusion surface. The hydraulic oil pushes the piston disc (7) to rise, and the extrusion strip (11) swings outward around the central hinge point. The arc-shaped extrusion surface abuts against the inner wall of the cylindrical gear body (6) to achieve symmetrical expansion and tightening.

10. The active power-off safety type cylindrical gear grinding machine according to claim 7, characterized in that: The drive motor (5) is fixedly installed inside the base (1), and the output shaft of the drive motor (5) is coaxially connected to the bottom of the rotating shaft (4) through a bevel gear set (51).

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