Blind tooth welding device and method for gear machining

Abstract

The invention provides a blind tooth welding device for gear machining and a method thereof, and belongs to the technical field of gear machining.The blind tooth welding device comprises a base, a mounting base is arranged on the upper surface of the base, a driving device is arranged in the middle of the top of the mounting base, and the lower end of the driving device is fixedly connected with a cylindrical shell through a flange; a floating plate is slidably mounted on the outer surface of the circumference of the cylindrical shell, a guide column is slidably connected to the interior of the floating plate through a linear bearing, and the upper end of the guide column is fixedly connected with the upper end of the cylindrical shell; by means of the spherical floating pressure head and the nonlinear spring set, the spherical floating pressure head can be attached to the surface of a workpiece in a self-adaptive mode, it is ensured that pressing force is perpendicular and free of lateral component force, and according to the low-rigidity platform area characteristic of the nonlinear spring, the height of the pressing force can still be kept constant when micro displacement of the workpiece is caused by welding thermal deformation; the heat input stability and the welding seam quality consistency in the welding process are fundamentally guaranteed, and the surface of a workpiece is effectively protected against damage.

Description

Technical Field

[0001] This invention belongs to the field of gear processing technology, specifically a blind tooth welding device and method for gear processing. Background Technology

[0002] In the field of repair welding of blind gear teeth, existing technologies typically employ a separate positioning and clamping scheme: a rigid clamp is used to radially position and clamp the gear in the horizontal direction, and then an independent welding clamping mechanism, usually driven by a cylinder or hydraulic cylinder, applies pressure to the blind tooth from above. However, this approach still has some drawbacks: 1. The rigid clamping head cannot adapt to the microscopic unevenness and angular deviation of the gear tooth surface or blind tooth surface, which can easily lead to uneven clamping force, lateral slippage, or even damage to the precision surface of the workpiece; 2. The clamping force provided by conventional linear springs or power cylinders fluctuates drastically with the displacement caused by the thermal deformation of the workpiece, and cannot provide a constant and stable clamping force during the welding thermal cycle, directly affecting the stability of the welding heat input and easily causing defects such as incomplete penetration, false welding, or over-welding.

[0003] Therefore, we propose a blind tooth welding device and method for gear processing to solve the problems encountered above. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that rigid pressure heads cannot adapt to the micro-unevenness and angular deviation of gear tooth surfaces or blind tooth surfaces, which easily leads to uneven clamping force, lateral slippage, or even damage to the precision surface of the workpiece; the clamping force provided by conventional linear springs or power cylinders fluctuates drastically with the displacement caused by the thermal deformation of the workpiece, and cannot provide a constant and stable clamping force during the welding thermal cycle, which directly affects the stability of welding heat input and easily causes defects such as incomplete weld penetration, false welds, or over-welds. Therefore, a blind tooth welding device and method for gear processing is proposed.

[0005] The objective of this invention can be achieved through the following technical solution: A base is included, with a mounting seat on its upper surface. A driving device is located at the center of the top of the mounting seat. A cylindrical shell is fixedly connected to the lower end of the driving device via a flange. A floating plate is slidably mounted on the outer circumference of the cylindrical shell. A guide column is slidably connected inside the floating plate via a linear bearing, and the upper end of the guide column is fixedly connected to the upper end of the cylindrical shell. A preload adjusting screw is rotatably mounted inside the upper end of the cylindrical shell. Four sets of guide columns and preload adjusting screws are arranged in a circumferential array. A preload plate is threaded onto the circumferential surface of the preload adjusting screw, and one side of the preload plate is sleeved on the circumference of the guide column. On the surface, a nonlinear spring is provided on the lower surface of the preload plate, and the nonlinear spring is sleeved on the circumferential surface of the guide column. A connecting plate is provided on the lower surface of the floating plate, and a rocker arm is hinged to the lower surface of the connecting plate by a pin. Four rocker arms are provided and arranged in a parallelogram. The lower ends of the four rocker arms are hinged to an annular pressure head mounting plate by a pin. A spherical floating pressure head is movably installed inside the lower end of the annular pressure head mounting plate through a spherical support. A locking screw is abutted at the upper end of the spherical support, and the locking screw is threadedly connected to the inside of the annular pressure head mounting plate. A limit clamping plate is provided below the cylindrical shell. Two limit clamping plates are symmetrically arranged on the left and right sides and are both located on the upper surface of the base.

[0006] In a preferred embodiment of the present invention, a spur gear is provided on the circumferential surface of the upper end of the preload adjusting screw, and an annular rack is meshed with one side of the spur gear. The upper end of the annular rack is rotatably connected to the upper end of the cylindrical shell through a rotating plate. Four actuating rods are provided on the outer circumferential surface of the annular rack. A stop block is provided on the circumferential surface of the preload adjusting screw, and the stop block is located between the preload plate and the spur gear.

[0007] In a preferred embodiment of the present invention, a scale is provided on the upper surface of the floating plate, and a pointer is provided on the inner side of the pre-pressing plate, with the pointer located at the front end of the scale.

[0008] In a preferred embodiment of the present invention, the floating plate and the connecting plate are both provided with a through groove one and a through groove two, the guide column and the linear bearing are both disposed inside the through groove one, and the lower end of the preload adjusting screw is disposed inside the through groove two.

[0009] In a preferred embodiment of the present invention, the spherical floating pressure head is the pressing end, and its bottom is located below the annular pressure head mounting plate. The spherical floating pressure head has a swing freedom of ±5° in any direction.

[0010] In a preferred embodiment of the present invention, a welding device is provided on the outer circumferential surface of the connecting plate, and four sets of welding devices are arranged in a circumferential array. The welding device includes a hollow mounting plate, which is fixedly connected to the connecting plate. A ball screw is rotatably mounted inside the hollow mounting plate. A welding gun is movably connected to the circumferential surface of the ball screw through a nut, and the nozzle of the welding gun faces the base.

[0011] In a preferred embodiment of the present invention, a servo motor is provided on the left side of the base, and a clamping screw is driven to the power output end of the servo motor. Moving blocks are threaded to the circumferential surfaces on both sides of the clamping screw, and the upper ends of the two moving blocks are respectively fixedly connected to the lower surfaces of the two limiting clamping plates.

[0012] In a preferred embodiment of the present invention, the threads on the left and right circumferential surfaces of the clamping screw have opposite directions of rotation, and the base has movable grooves on both the left and right sides, with the two movable blocks respectively disposed inside the two movable grooves.

[0013] As a preferred embodiment of the present invention, a blind tooth welding method for gear processing specifically includes the following steps: Step 1: Place the gear and blind tooth between the two limiting clamping plates in sequence, and splice the blind tooth and the gear at their defective parts together. Then start the servo motor to drive the clamping screw to rotate, and then the two limiting clamping plates move closer to each other to limit and clamp the gear and blind tooth. Step 2: Drive the ring rack to rotate by the lever, so that the ring rack drives the preload adjustment screw to rotate through the spur gear, so that the preload plate moves vertically downward. Observe the rated clamping force of the nonlinear spring according to the pointer on the preload plate. Stop rotating the ring rack when the pointer reaches the scale of the predetermined clamping force. Step 3: The drive device moves the flange and cylindrical shell vertically downwards. The lower end of the cylindrical shell is inserted into the center hole of the gear. The spherical floating pressure head at the lower end of the annular pressure head mounting plate abuts against the upper surface of the gear and blind tooth. The spherical floating pressure head adjusts its angle adaptively through the spherical pair structure, so that its bottom is completely in contact with the upper surface of the gear and blind tooth, ensuring that the clamping force is perpendicular to the contact surface. This makes the longitudinal clamping limit of the gear and blind tooth more stable. When the drive device moves the cylindrical shell downwards, because the lower end of the cylindrical shell is inserted into the center hole of the gear, and the floating pressure head at the lower end of the annular pressure head mounting plate abuts against the upper surface of the gear, the cylindrical shell and the annular pressure head mounting plate undergo relative displacement. The annular pressure head mounting plate drives the connecting plate and floating plate to move upwards through the swing rod, further compressing the nonlinear spring. During the relative displacement, the clamping force generated by the floating pressure head on the gear and blind tooth remains basically constant. Step 4: The welding torch is used to weld the connection between the gear and the blind tooth. During the welding process, the constant pressure characteristic of the nonlinear spring is used to counteract the effect of the small displacement of the workpiece caused by thermal deformation on the clamping force, thus maintaining the stability of the welding process.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By setting a spherical floating pressure head and a nonlinear spring group, the spherical floating pressure head can adaptively fit the workpiece surface and ensure that the clamping force is vertical without lateral component. According to the characteristics of the low stiffness plateau area of ​​the nonlinear spring, the clamping force height can still be kept constant when the workpiece is slightly displaced due to welding thermal deformation. This fundamentally ensures the stability of heat input and the consistency of weld quality during the welding process, and effectively protects the workpiece surface from damage. (2) By integrating the axial clamping mechanism such as the spherical floating pressure head and nonlinear spring group onto the cylindrical shell, it can perform preliminary precise centering when the cylindrical shell moves down and inserts into the gear inner hole, and then cooperate with the radial clamping of the limit clamping plate to form a redundant positioning of "internal and external combination". The positioning rigidity and accuracy are higher, and the parallelogram linkage mechanism formed by the four swing rods ensures the absolute verticality of the clamping movement and eliminates the additional torque. The whole can achieve the intelligent effect of "adaptive" and "constant pressure" without the need for sensors and electrical control system. It has strong anti-interference ability, is suitable for harsh industrial environments, has low maintenance cost and extremely high reliability. Attached Figure Description

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention; Figure 3 This is a perspective view of the present invention. Figure 4 For the present invention Figure 3 Enlarged view of the structure at point A in the middle; Figure 5 For the present invention Figure 3 Enlarged view of the structure at point B; Figure 6 This is a top sectional perspective view of the present invention.

[0017] In the diagram: 1. Base; 2. Mounting seat; 3. Drive unit; 4. Flange; 5. Cylindrical shell; 6. Guide column; 7. Floating plate; 8. Connecting plate; 9. Swing rod; 10. Annular pressure head mounting plate; 11. Preload adjusting screw; 12. Preload plate; 13. Nonlinear spring; 14. Pointer; 15. Scale; 16. Through slot one; 17. Through slot two; 18. Linear bearing; 19. Stop block; 20. Spur gear; 21. Rotating plate; 22. Annular rack; 23. Actuating rod; 24. Spherical floating pressure head; 25. Hollow mounting plate; 26. Ball screw; 27. Welding torch; 28. Limiting clamping plate; 29. ​​Servo motor; 30. Clamping screw; 31. Moving block; 32. Spherical support; 33. Locking screw. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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. Example

[0019] Please see Figure 1 - Figure 6As shown, a blind gear welding device for gear processing includes a base 1, a mounting seat 2 on the upper surface of the base 1, a driving device 3 at the center of the top of the mounting seat 2, and a cylindrical shell 5 fixedly connected to the lower end of the driving device 3 via a flange 4. The outer diameter of the cylindrical shell 5 matches the center hole of the gear, so that when the cylindrical shell 5 moves vertically downward, its lower end can be inserted into the center hole of the gear to limit the gear. A floating plate 7 is slidably mounted on the outer circumference of the cylindrical shell 5, and a guide is slidably connected inside the floating plate 7 via a linear bearing 18. The upper end of the guide column 6 is fixedly connected to the upper end of the cylindrical shell 5, allowing the floating plate 7 to slide on the guide column 6 via the linear bearing 18. A preload adjusting screw 11 is rotatably installed inside the upper end of the cylindrical shell 5. Four sets of preload adjusting screws 11 are arranged in a circumferential array on both the guide column 6 and the guide column 6. A preload plate 12 is threaded onto the circumferential surface of the preload adjusting screw 11, and one side of the preload plate 12 is fitted onto the circumferential surface of the guide column 6. A nonlinear spring 13 is provided on the lower surface of the preload plate 12, and the nonlinear spring 13 is fitted onto the circumference of the guide column 6. On the surface, a spur gear 20 is provided on the circumferential surface of the upper end of the preload adjusting screw 11. A ring rack 22 is meshed with one side of the spur gear 20. The upper end of the ring rack 22 is rotatably connected to the upper end of the cylindrical shell 5 through a rotating plate 21. A lever 23 is provided on the outer circumference of the ring rack 22, and four levers 23 are provided. The four levers 23 allow the operator to rotate the ring rack 22 from any position on the device. The ring rack 22 is designed to simultaneously drive four sets of... The spur gear 20 and the preload adjusting screw 11 rotate, thereby causing the four sets of nonlinear springs 13 to adjust the preload synchronously. The circumferential surface of the preload adjusting screw 11 is provided with a stop 19, and the stop 19 is located between the preload plate 12 and the spur gear 20. The upper surface of the floating plate 7 is provided with a scale 15, and the inner side of the preload plate 12 is provided with a pointer 14, which is located at the front end of the scale 15. The pointer 14 and the scale 15 can intuitively display the current output force of the nonlinear spring 13, thereby facilitating the operator to adjust the preload of the nonlinear spring 13. It should be noted that the nonlinear spring 13 adopts a variable pitch or variable wire diameter design, and its force-displacement curve has a distinct low-stiffness plateau region. The nonlinear spring 13 is always in a pre-compressed state. The pre-compression amount of the nonlinear spring 13 can be manually adjusted through the pre-compression adjusting screw 11 and the pre-compression plate 12 to ensure that the working starting point of the spring is located at the starting point of the plateau region of its force-displacement curve. The cylindrical housing 5 has a dual function: firstly, when the cylindrical housing 5 moves downward to insert into the center hole of the gear, it can perform preliminary radial positioning of the gear; secondly... When the cylindrical shell 5 moves downward, the preload adjusting screw 11 and the guide post 6 move together with the cylindrical shell 5. That is, when the lower end of the cylindrical shell 5 is inserted into the center hole of the gear, the lower end of the spherical floating pressure head 24 abuts against the upper surface of the gear. Then, when the cylindrical shell 5 drives the preload adjusting screw 11 and the guide post 6 to move downward, the floating plate 7 and the annular pressure head mounting plate 10 are obstructed by the gear, causing them to undergo relative displacement with the cylindrical shell 5. Subsequently, the floating plate 7 and the annular pressure head mounting plate 10 will compress the nonlinear spring 13, generating a constant pressure clamping force.

[0020] A connecting plate 8 is provided on the lower surface of the floating plate 7. A rocker arm 9 is hinged to the lower surface of the connecting plate 8 via a pin. Four rocker arms 9 are arranged in a parallelogram shape. The lower ends of the four rocker arms 9 are hinged to an annular pressure head mounting plate 10 via pins. A spherical floating pressure head 24 is movably mounted inside the lower end of the annular pressure head mounting plate 10 via a spherical support 32. The arrangement of the spherical support 32 and the spherical floating pressure head 24 allows for a microscopic angle between the lower end of the spherical floating pressure head 24 and the gear surface. Adaptive, the upper end of the spherical support 32 abuts against the locking screw 33, and the locking screw 33 is threadedly connected to the inside of the annular pressure head mounting plate 10. A limit clamping plate 28 is provided below the cylindrical shell 5. Two limit clamping plates 28 are symmetrically arranged on the left and right and are both set on the upper surface of the base 1, so that when the two limit clamping plates 28 abut against each other, the gear and blind tooth can be horizontally limited and clamped between the two limit clamping plates 28, thereby facilitating the longitudinal limiting operation of the cylindrical shell 5. It should be noted that the arrangement of the four levers 9 ensures that the annular pressure head mounting plate 10 remains absolutely parallel to the connecting plate 8 at any height, and the clamping force is always vertically downward. After the spherical floating pressure head 24 adapts to the angular swing of the gear and blind tooth surfaces, the four levers 9 completely absorb all the angular changes below, ensuring that only pure, vertical linear motion is transmitted to the upper part. At the same time, it not only ensures vertical motion, but also resists lateral forces or torques from any direction, preventing the annular pressure head mounting plate 10 from jamming or shaking when subjected to uneven forces.

[0021] A welding device is provided on the outer circumference of the connecting plate 8, and four sets of welding devices are arranged in a circumferential array. The arrangement of four sets of welding devices enables welding work to be performed on more positions, reducing the adjustment time of gears or welding devices during welding work. The welding device includes a hollow mounting plate 25, which is fixedly connected to the connecting plate 8. A ball screw 26 is rotatably installed inside the hollow mounting plate 25. A welding torch 27 is movably connected to the circumferential surface of the ball screw 26 through a nut, and the nozzle of the welding torch 27 faces the base 1. The arrangement of the ball screw 26 allows the welding torch 27 to be adjusted horizontally in the left and right directions, so that the nozzle of the welding torch 27 can face the inner side of the annular pressure head mounting plate 10 or the outer side of the annular pressure head mounting plate 10, thereby increasing the welding range of the welding torch 27. A servo motor 29 is provided on the left side of the base 1. The power output end of the servo motor 29 is connected to a clamping screw 30. The circumferential surfaces on both sides of the clamping screw 30 are threaded with movable blocks 31. The upper ends of the two movable blocks 31 are fixedly connected to the lower surfaces of the two limiting clamping plates 28 respectively. The threads on the circumferential surfaces on both sides of the clamping screw 30 have opposite directions of rotation, so that when the clamping screw 30 rotates, the two movable blocks 31 on its surface can move closer to each other or further away from each other, thereby driving the two limiting clamping plates 28 to move closer to each other to clamp the gears or move further away from each other, which facilitates the removal and placement of the gears. Movable slots are provided on both the left and right sides of the base 1. The two movable blocks 31 are respectively set inside the two movable slots. The movable slots provide space for the movable blocks 31 to move, so that the movable blocks 31 can move horizontally smoothly. It should be noted that the drive device 3 consists of a lifting electric cylinder and a rotary motor. The lifting electric cylinder can drive the rotary motor and flange 4 to move vertically, so that the cylindrical shell 5 below flange 4 can vertically limit the gear or release the limiting effect on the gear. The rotary motor can drive the cylindrical shell 5 to rotate laterally within the range of 0-90°, which facilitates the adjustment of the position of the welding torch 27. The operator does not need to disassemble and re-clamp the welding torch 27. He only needs to select different welding torches 27 and the corresponding rotation angle to quickly cover the welding positions of all blind teeth on the circumference of the gear, realizing one clamping and multi-station welding, which greatly improves the flexibility and production efficiency of the equipment and facilitates the welding work of the welding torch 27 at the connection of gears and blind teeth.

[0022] Preferably, both the floating plate 7 and the connecting plate 8 have through slots 16 and 17. The guide column 6 and the linear bearing 18 are both located inside the upper through slot 16, and the lower end of the preload adjusting screw 11 is located inside the upper through slot 27. The arrangement of through slots 16 and 17 allows the lower ends of the guide column 6 and the preload adjusting screw 11 to be inserted into the through slots 16 and 17 respectively when the floating plate 7 and the connecting plate 8 move vertically upward. This prevents the connecting plate 8 from colliding and jamming with the guide column 6 and the preload adjusting screw 11, and allows the floating plate 7, the connecting plate 8, the annular pressure head mounting plate 10, and the cylindrical shell 5 to move relatively smoothly. This counteracts the effect of small workpiece displacement caused by thermal deformation on the clamping force and maintains the stability of the welding process. Preferably, the spherical floating pressure head 24 is the clamping end, and its bottom is located below the annular pressure head mounting plate 10. The spherical floating pressure head 24 has a swing freedom of ±5° in any direction, so that when the spherical floating pressure head 24 contacts the surface of the gear and the blind tooth, it swings slightly around the spherical support 32 according to the reaction force generated by the gear and the blind tooth, until its clamping end face is completely in contact with the tooth surface of the blind tooth, eliminating the lateral force and ensuring that the force is completely perpendicular to the tooth surface. The clamping force acting on the gear and the blind tooth is stabilized in the low stiffness platform area, realizing constant pressure clamping and effectively avoiding damage to the tooth surface. Example

[0023] Please see Figure 1 and Figure 3 As shown, the present invention also discloses a blind tooth welding method for gear processing, which specifically includes the following steps; Step 1: The two limiting clamping plates 28 are initially far apart and do not contact each other, which facilitates the placement of the gear. At this time, the gear and blind tooth are placed between the two limiting clamping plates 28 in sequence, and the blind tooth and the defective part of the gear are spliced ​​together. Then, the servo motor 29 is started. The servo motor 29 drives the clamping screw 30 to rotate, so that the two moving blocks 31 drive the two limiting clamping plates 28 to move closer to each other, and radially clamp the gear and blind tooth to the edge of the gear to achieve circumferential anti-rotation positioning. Step 2: The ring rack 22 is rotated by the lever 23, which in turn drives the four sets of spur gears 20 and the four sets of preload adjustment screws 11 to rotate. This, in turn, drives the four sets of preload plates 12 to move vertically downward, so that the four sets of preload plates 12 press down on the four corresponding nonlinear springs 13. The rated clamping force of the nonlinear springs 13 is observed according to the pointer 14 on the preload plate 12 and the scale on its corresponding scale 15. When the pointer 14 reaches the scale of the predetermined clamping force, the ring rack 22 is no longer rotated, thus completing the adjustment of the preload of the nonlinear springs 13. Step 3: The driving device 3 drives the flange 4 and the cylindrical housing 5 to move vertically downwards. The lower end of the cylindrical housing 5 is inserted into the center hole of the gear, and its lower side abuts against the inner side of the gear. Through the cooperation of the limiting clamping plate 28, the horizontal limiting effect is further improved. The spherical floating pressure head 24 at the lower end of the annular pressure head mounting plate 10 abuts against the upper surface of the gear and blind tooth. The spherical floating pressure head 24 adjusts its angle adaptively through the spherical pair structure, so that its bottom is completely in contact with the upper surface of the gear and blind tooth, ensuring that the clamping force is perpendicular to the contact surface. The longitudinal clamping and limiting of the gear and blind tooth is more stable. When the driving device 3 drives the cylindrical housing 5 to move downwards, because the lower end of the cylindrical housing 5 is inserted into the center hole of the gear... The spherical floating pressure head 24 at the lower end of the annular pressure head mounting plate 10 abuts against the upper surface of the gear, causing the cylindrical shell 5 and the annular pressure head mounting plate 10 to undergo relative displacement. The annular pressure head mounting plate 10 drives the connecting plate 8 and the floating plate 7 to move upward through the swing rod 9, further compressing the nonlinear spring 13. During the relative displacement, the clamping force generated by the spherical floating pressure head 24 on the gear and blind tooth remains basically constant. After the cylindrical shell 5 and the annular pressure head mounting plate 10 complete the longitudinal limiting and fixing of the gear and blind tooth, the locking screw 33 is rotated to fix the spherical support 32 and the spherical floating pressure head 24, so as to prevent the spherical floating pressure head 24 from floating again during the subsequent welding process. Step 4: The welding torch 27 operates to weld the connection between the gear and the blind tooth. During the welding process, the constant pressure characteristic of the nonlinear spring 13 counteracts the effect of the small displacement of the workpiece caused by thermal deformation on the clamping force, maintaining the stability of the welding process. After the welding is completed, the drive device 3 reverses its operation, driving the cylindrical shell 5 to reset upwards, so that the cylindrical shell 5 and the annular pressure head mounting plate 10 lose their longitudinal limiting effect on the gear. At the same time, the servo motor 29 drives the clamping screw 30 to rotate in the opposite direction, so that the limiting clamping plate 28 loses its horizontal clamping effect on the gear. At this time, the gear can be removed for the welding and repair work of the next gear.

[0024] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A blind gear welding device for gear processing, comprising a base (1), wherein a mounting seat (2) is provided on the upper surface of the base (1), and a driving device (3) is provided at the center of the top of the mounting seat (2), characterized in that, The lower end of the drive device (3) is fixedly connected to a cylindrical shell (5) via a flange (4). A floating plate (7) is slidably mounted on the outer circumference of the cylindrical shell (5). A guide column (6) is slidably connected inside the floating plate (7) via a linear bearing (18). A preload adjusting screw (11) is rotatably mounted inside the upper end of the cylindrical shell (5). A preload adjusting screw (11) is threadedly connected to a preload plate (12) on the circumference of the preload adjusting screw (11). A nonlinear spring (13) is provided on the lower surface of the preload plate (12). A nonlinear spring (13) is provided on the lower surface of the floating plate (7). A connecting plate (8) is provided, and a rocker arm (9) is hinged to the lower surface of the connecting plate (8) by a pin. The lower ends of the four rocker arms (9) are hinged to an annular pressure head mounting plate (10) by a pin. A spherical floating pressure head (24) is movably installed inside the lower end of the annular pressure head mounting plate (10) through a spherical support (32). A locking screw (33) is abutted at the upper end of the spherical support (32). A limit clamping plate (28) is provided below the cylindrical shell (5). Two limit clamping plates (28) are symmetrically arranged on the left and right sides and are both located on the upper surface of the base (1).

2. The blind gear welding device for gear processing according to claim 1, characterized in that, A spur gear (20) is provided on the circumferential surface of the upper end of the preload adjusting screw (11). A ring rack (22) is meshed on one side of the spur gear (20). The upper end of the ring rack (22) is rotatably connected to the upper end of the cylindrical shell (5) through a rotating plate (21). A toggle rod (23) is provided on the outer circumferential surface of the ring rack (22), and four toggle rods (23) are provided. A stop block (19) is provided on the circumferential surface of the preload adjusting screw (11), and the stop block (19) is located between the preload plate (12) and the spur gear (20).

3. The blind gear welding device for gear processing according to claim 1, characterized in that, The upper surface of the floating plate (7) is provided with a scale (15), and the inner side of the pre-pressing plate (12) is provided with a pointer (14), and the pointer (14) is located at the front end of the scale (15). The upper end of the guide post (6) is fixedly connected to the upper end of the cylindrical shell (5); the guide post (6) and the preload adjusting screw (11) are arranged in a circumferential array of four sets; one side of the preload plate (12) is sleeved on the circumferential surface of the guide post (6); the nonlinear spring (13) is sleeved on the circumferential surface of the guide post (6); four swing rods (9) are arranged in a parallelogram; the locking screw (33) is threadedly connected to the inside of the annular pressure head mounting plate (10).

4. The blind gear welding device for gear processing according to claim 1, characterized in that, The floating plate (7) and the connecting plate (8) are both provided with through slot one (16) and through slot two (17). The guide column (6) and the linear bearing (18) are both located inside the through slot one (16) mentioned above. The lower end of the preload adjusting screw (11) is located inside the through slot two (17) mentioned above.

5. The blind gear welding device for gear processing according to claim 1, characterized in that, The spherical floating pressure head (24) is the pressing end, and its bottom is located below the annular pressure head mounting plate (10). The spherical floating pressure head (24) has a swing freedom of ±5° in any direction.

6. The blind gear welding device for gear processing according to claim 1, characterized in that, The outer circumferential surface of the connecting plate (8) is provided with a welding device, and four sets of welding devices are arranged in a circumferential array. The welding device includes a hollow mounting plate (25), which is fixedly connected to the connecting plate (8). A ball screw (26) is rotatably installed inside the hollow mounting plate (25). A welding gun (27) is movably connected to the circumferential surface of the ball screw (26) through a nut, and the nozzle of the welding gun (27) faces the base (1).

7. The blind gear welding device for gear processing according to claim 1, characterized in that, A servo motor (29) is provided on the left side of the base (1). The power output end of the servo motor (29) is connected to a clamping screw (30). The circumferential surfaces on both sides of the clamping screw (30) are threaded with moving blocks (31). The upper ends of the two moving blocks (31) are respectively fixedly connected to the lower surfaces of the two limiting clamping plates (28).

8. A blind gear welding device for gear processing according to claim 7, characterized in that, The threads on the left and right circumferential surfaces of the clamping screw (30) are in opposite directions. Movable slots are provided on both the left and right sides of the base (1), and the two movable blocks (31) are respectively located inside the two movable slots.

9. A welding method applied to the blind gear welding apparatus for gear processing as described in any one of claims 1-8, characterized in that, Specifically, the following steps are included: Step 1: Place the gear and blind tooth between the two limiting clamping plates (28) in sequence, and splice the blind tooth and the gear at the defective part together. Then start the servo motor (29) to drive the clamping screw (30) to rotate. Then the two limiting clamping plates (28) move closer to each other to limit and clamp the gear and blind tooth. Step 2: Drive the ring rack (22) to rotate by the lever (23), so that the ring rack (22) drives the preload adjustment screw (11) to rotate through the spur gear (20), so that the preload plate (12) moves vertically downward. According to the pointer (14) on the preload plate (12), observe the rated clamping force of the nonlinear spring (13). When the pointer (14) reaches the scale of the predetermined clamping force, stop rotating the ring rack (22). Step 3: Driven by the drive device (3), the flange (4) and the cylindrical shell (5) move vertically downwards. The lower end of the cylindrical shell (5) is inserted into the center hole of the gear. The spherical floating pressure head (24) at the lower end of the annular pressure head mounting plate (10) abuts against the upper surface of the gear and blind tooth. The spherical floating pressure head (24) adjusts its angle adaptively through the spherical pair structure, so that its bottom is completely in contact with the upper surface of the gear and blind tooth, ensuring that the clamping force is perpendicular to the contact surface. The longitudinal clamping limit of the gear and blind tooth is more stable. The drive device (3) drives the cylindrical shell (5) to move vertically downwards. When the cylindrical shell (5) moves downward, the lower end of the cylindrical shell (5) is inserted into the center hole of the gear, and the spherical floating pressure head (24) at the lower end of the annular pressure head mounting plate (10) abuts against the upper surface of the gear, causing the cylindrical shell (5) and the annular pressure head mounting plate (10) to undergo relative displacement. The annular pressure head mounting plate (10) drives the connecting plate (8) and the floating plate (7) to move upward through the swing rod (9), further compressing the nonlinear spring (13). During the relative displacement process, the clamping force generated by the spherical floating pressure head (24) on the gear and the blind tooth remains basically constant. Step 4: The welding torch (27) is used to weld the connection between the gear and the blind tooth. During the welding process, the constant pressure characteristic of the nonlinear spring (13) is used to counteract the effect of the small displacement of the workpiece caused by thermal deformation on the clamping force.

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