Fixing device for PDC drill bit welding

Abstract

The invention discloses a fixing device for PDC drill bit welding and relates to the technical field of welding, the fixing device comprises a rack, a limiting box is welded to the top end of the rack, a sliding plate is slidably connected to an inner cavity of the limiting box, and universal wheels are riveted to the corners of the lower surface of the sliding plate. By arranging the limiting box, the sliding plate can stably move in the inner cavity of the limiting box, then the position of the sliding plate in the inner cavity of the limiting box is adjusted, by arranging the universal wheels, the sliding plate can stably move and support the sliding plate when the position is adjusted, the upper surface of the sliding plate is provided with the positioning mechanism, and the positioning mechanism is used for positioning the sliding plate. The positioning mechanism is used for positioning and clamping a drill bit rod of the PDC drill bit, the drill bit rod of the PDC drill bit can be clamped and positioned through the positioning mechanism, and when the drill bit rod of the PDC drill bit and the drill bit are welded together, the effect that the drill bit and the drill bit rod of the PDC drill bit are tightly positioned together is achieved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to a fixing device for welding PDC drill bits. Background Technology

[0002] PDC (Polycrystalline Diamond Composite) drill bits are advanced cutting tools widely used in oil and gas drilling, geological exploration, and other fields. Their core cutting element is the polycrystalline diamond composite (PDC), which is formed by combining artificially synthesized polycrystalline diamond layers with a cemented carbide matrix under high temperature and pressure, combining the high wear resistance of diamond with the impact toughness of cemented carbide. Compared to traditional roller cone drill bits, PDC drill bits adopt an integral design, breaking rocks through shearing, and have significant advantages such as high mechanical drilling speed, long service life, stable operation, and good wellbore quality. Modern PDC drill bits are optimized using computer-aided design and simulation technology. Through reasonable arrangement of cutter wings and cutting teeth, and optimized hydraulic structure, they can achieve efficient drilling for different formations (such as soft to medium-hard formations). Their superior performance effectively reduces the number of tripping operations, significantly improves drilling efficiency, and reduces overall operating costs, making them an indispensable key tool in modern high-efficiency drilling technology.

[0003] In the manufacturing process of PDC drill bits, the welding of the drill bit body to the drill pipe interface is an extremely critical step. If the clamping is not secure during welding, even a slight misalignment or vibration between the drill bit body and the drill pipe will have a series of serious adverse effects. The most direct consequence is weld quality defects. An unstable state will lead to uneven filler metal, resulting in porosity, slag inclusions, or incomplete penetration, which greatly weakens the structural strength and sealing of the joint, making it the weakest point in the entire drill string. Under the complex alternating loads of high torque and high bending moment downhole, this point is extremely prone to fracture, causing the expensive drill bit to fall into the well, resulting in huge economic losses and complicated salvage operations. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a fixing device for welding PDC drill bits, comprising a frame, a limit box welded to the top of the frame, a sliding plate slidably connected to the inner cavity of the limit box, and casters riveted to the corners of the lower surface of the sliding plate. By setting the limit box, the sliding plate can be limited, allowing it to move stably within the inner cavity of the limit box, thereby adjusting its position within the limit box. The casters ensure stable movement of the sliding plate during position adjustment and facilitate smooth sliding. The sliding plate provides support, and its upper surface is equipped with a positioning mechanism. This positioning mechanism clamps and positions the PDC drill bit's shank, ensuring its connection to the drill bit during welding. A second limiting ring is welded to the upper surface of the limiting box, and a fixing mechanism is located within the ring's inner cavity. This fixing mechanism is used to position and clamp the PDC drill bit. The fixing mechanism includes a positioning frame rotatably connected to the inner cavity of the second limiting ring. The outer surface of the positioning frame has several positioning holes evenly distributed. These positioning holes are used to align with the protrusions of the PDC drill bit. A tightening mechanism is provided on the inner wall of the positioning frame, and a clamping mechanism is provided on the outer surface of the positioning frame. By setting the second limiting ring, the fixing mechanism can be limited, allowing it to rotate stably within the inner cavity of the second limiting ring. The fixing mechanism allows for... The PDC drill bit is clamped, and the clamping force can be adjusted to clamp the drill bit parts of PDC drill bits of different diameters. Then, a rotational force can be applied to the PDC drill bit, causing it to rotate. This achieves the effect of rotating and welding the drill bit part and the drill rod part of the PDC drill bit. By setting a positioning frame and opening several positioning holes on its outer surface, the positioning frame can be aligned with the protrusion of the drill bit part of the PDC drill bit. Thus, when the positioning frame rotates, it drives the PDC drill bit to rotate.

[0005] Preferably, a hydraulic cylinder is fixedly connected to the lower surface of the limiting box, and a moving rod is provided at the output end of the hydraulic cylinder. The end of the moving rod away from the hydraulic cylinder is welded to the lower surface of the sliding plate. The positioning mechanism includes a first limiting ring, a positioning cylinder is rotatably connected to the inner cavity of the first limiting ring, a first limiting groove is welded to the outer surface of the positioning cylinder, and a first ball is rotatably connected to the inner cavity of the first limiting groove. The first ball is frictionally adapted to the inner wall of the first limiting ring.

[0006] Preferably, the outer surface of the positioning cylinder is perforated with a threaded ring, and the number of the threaded rings is several, and the several threaded rings are evenly distributed. The inner cavity of the threaded ring is threadedly connected to a threaded post, and a soft pad is fixedly connected to one end of the threaded post located in the inner cavity of the positioning cylinder.

[0007] Preferably, a second limiting groove is welded to the outer surface of the positioning frame, and a second ball is rotatably connected to the inner cavity of the second limiting groove. The second ball is frictionally adapted to the inner wall of the second limiting ring. A toothed ring is welded to the outer surface of the positioning frame. The fixing mechanism also includes a stepper motor, which is fixedly connected to the upper surface of the limiting box. A rotating rod is installed at the output end of the stepper motor through a coupling. A gear is fixedly connected to the end of the rotating rod, and the gear meshes with the toothed ring.

[0008] Preferably, the tightening mechanism includes a connecting column, which is welded to the inner wall of the positioning frame. An internally threaded tube is welded to the end of the connecting column away from the positioning frame. A threaded disc is threadedly connected to the inner cavity of the internally threaded tube. A sealing ring is fixedly connected to the outer surface of the threaded disc, and the sealing ring is frictionally adapted to the inner wall of the internally threaded tube.

[0009] Preferably, a support frame is riveted to the side of the threaded disc away from the sealing ring, and a sliding tube is welded to the end of the support frame away from the threaded disc. The sliding tube is sleeved on the outer surface of the internal threaded tube, an anti-slip ring is welded to the end of the sliding tube, and a conical barrel is welded to the outer surface of the sliding tube.

[0010] Preferably, a flexible tube passes through the outer surface of the internally threaded tube near the connecting column, and an arc-shaped tube passes through the end of the flexible tube away from the internally threaded tube. Telescopic tubes pass through both sides of the arc-shaped tube. There are three telescopic tubes and arc-shaped tubes, and the three telescopic tubes and arc-shaped tubes are spaced apart. The arc-shaped tube is frictionally adapted to the outer surface of the conical barrel.

[0011] Preferably, the number of clamping mechanisms is three, and the three clamping mechanisms are evenly distributed on the outer surface of the positioning frame. Each clamping mechanism includes a limiting frame, which is welded to the outer surface of the positioning frame. A rolling bearing is fixedly connected to the inner wall of the limiting frame, and a rotating column is fixedly connected to the inner ring of the rolling bearing. A rotating frame is welded to the end of the rotating column.

[0012] Preferably, a connecting pipe is fixedly connected to the outer surface of the rotating frame, the end of the connecting pipe passes through an arc-shaped pipe, a support plate is welded to the end of the rotating frame away from the arc-shaped pipe, an anti-slip strip is riveted to the end of the support plate away from the connecting pipe, a limiting pipe is riveted to the end of the support plate away from the rotating frame, a connecting cover is welded to the opening on the upper surface of the limiting pipe, the end of the connecting pipe away from the arc-shaped pipe is welded to the inner wall of the connecting cover, a piston is slidably connected to the inner cavity of the limiting pipe, a piston rod is welded to the lower surface of the piston, and a clamping plate is welded to the bottom end of the piston rod.

[0013] This invention provides a fixing device for welding PDC drill bits. It has the following advantages: I. The fixing device for PDC drill bit welding, by setting a positioning mechanism, can clamp and position the drill bit rod of the PDC drill bit, so that when the drill bit rod and the drill bit are welded together, the drill bit rod of the PDC drill bit is positioned and clamped, and can be connected to the drill bit, so as to achieve the effect of connecting the PDC drill bit rod and the drill bit together during welding.

[0014] II. The fixing device for welding PDC drill bits, by setting a fixing mechanism, can clamp the drill bit part of the PDC drill bit, and can clamp the drill bit parts of PDC drill bits of different diameters by adjusting the clamping force. Then, it can apply a rotational force to the PDC drill bit, thereby causing the clamped PDC drill bit to rotate, achieving the effect of rotating and welding the drill bit part of the PDC drill bit to the drill bit rod part. By setting a positioning frame and opening several positioning holes on its outer surface, the positioning frame can be aligned with the protrusion of the drill bit part of the PDC drill bit, so that when the positioning frame rotates, it drives the PDC drill bit to rotate.

[0015] 3. The fixing device for welding PDC drill bits, by setting a tightening mechanism, can adjust the clamping mechanism after the drill bit part of the PDC drill bit is placed, thereby clamping the drill bit part of the PDC drill bit. By setting an internal threaded tube, the threaded disc can be limited, so that when the threaded disc rotates, it can move laterally in the inner cavity of the internal threaded tube. By setting a sealing ring, the air in the inner cavity of the internal threaded tube can be compressed when the threaded disc moves. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the external structure of a fixing device for welding PDC drill bits according to the present invention; Figure 2 This is a structural side view of a fixing device for welding PDC drill bits according to the present invention; Figure 3 This is a partial structural schematic diagram of a fixing device for welding PDC drill bits according to the present invention; Figure 4 This is a schematic diagram of the positioning mechanism structure of the present invention; Figure 5 This is a schematic diagram of the fixing mechanism structure of the present invention; Figure 6 This is a partial structural diagram of the fixing mechanism of the present invention; Figure 7 This is a schematic diagram of the tightening mechanism of the present invention; Figure 8 This is a schematic cross-sectional view of the tightening mechanism of the present invention; Figure 9 This is a schematic diagram of the clamping mechanism of the present invention; Figure 10 This is a schematic cross-sectional view of the clamping mechanism of the present invention.

[0017] In the diagram: 1. Frame; 2. Limit box; 3. Sliding plate; 4. Casters; 5. Positioning mechanism; 51. First limit ring; 52. Positioning cylinder; 53. First limit groove; 54. First ball bearing; 55. Threaded ring; 56. Threaded post; 57. Soft pad; 6. Second limit ring; 7. Fixing mechanism; 8. Hydraulic cylinder; 9. Moving rod; 71. Positioning frame; 72. Stepper motor; 73. Rotating rod; 74. Gear; 75. Gear ring; 76. Second limiting groove; 77. Second ball bearing; 78. Tightening mechanism; 781. Connecting column; 782. Internally threaded tube; 783. Hoses; 784. Arc-shaped tube; 785. Telescopic tube; 786. Threaded disc; 787. Sealing ring; 788. Support frame; 789. Sliding tube; 7810. Anti-slip ring; 7811. Conical barrel; 79. Clamping mechanism; 791. Limiting frame; 792. Rolling bearing; 793. Rotating column; 794. Rotating frame; 795. Connecting pipe; 796. Support plate; 797. Anti-slip strip; 798. Limiting pipe; 799. Connecting cover; 7910. Piston; 7911. Piston rod; 7912. Clamping plate; 710. Positioning hole. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0019] like Figures 1-10As shown, the present invention provides a technical solution: a fixing device for welding PDC drill bits, including a frame 1, a limit box 2 welded to the top of the frame 1, a sliding plate 3 slidably connected to the inner cavity of the limit box 2, and casters 4 riveted to the corners of the lower surface of the sliding plate 3. By setting the limit box 2, the sliding plate 3 can be limited, allowing the sliding plate 3 to move stably within the inner cavity of the limit box 2, thereby adjusting the position of the sliding plate 3 within the inner cavity of the limit box 2. By setting the casters 4, the sliding plate 3 can move stably during position adjustment and the casters 4 can support the sliding plate 3. A positioning mechanism 5 is provided on the upper surface of the sliding plate 3. This positioning mechanism 5 clamps and positions the drill rod of the PDC drill bit, ensuring that the drill rod is clamped and connected to the drill bit during welding. A second limiting ring 6 is welded to the upper surface of the limiting box 2. A fixing mechanism 7 is provided inside the second limiting ring 6. This fixing mechanism 7 is used for positioning and clamping the PDC drill bit. The fixing mechanism 7 includes a positioning frame 71. The positioning frame 71 is rotatably connected to the inner cavity of the second limiting ring 6. Positioning holes 710 are provided on the outer surface of the positioning frame 71, and the number of positioning holes 710 is several, evenly distributed. These positioning holes 710 are used to align with the protrusions of the PDC drill bit. A tightening mechanism 78 is provided on the inner wall of the positioning frame 71, and a clamping mechanism 79 is provided on the outer surface of the positioning frame 71. By setting the second limiting ring 6, the fixing mechanism 7 can be limited, allowing the fixing mechanism 7 to rotate stably within the inner cavity of the second limiting ring 6. By setting the fixing mechanism 7, the PDC drill bit can be... The DC drill bit is clamped, and the clamping force can be adjusted to clamp the drill bit parts of PDC drill bits of different diameters. Then, a rotational force can be applied to the PDC drill bit, causing the clamped PDC drill bit to rotate, achieving the effect of rotating and welding the drill bit part of the PDC drill bit to the drill rod part. By setting a positioning frame 71 and opening several positioning holes 710 on its outer surface, the positioning frame 71 can be aligned with the protrusion of the drill bit part of the PDC drill bit, so that when the positioning frame 71 rotates, it drives the PDC drill bit to rotate.

[0020] A hydraulic cylinder 8 is fixedly connected to the lower surface of the limiting box 2. A moving rod 9 is provided at the output end of the hydraulic cylinder 8. The end of the moving rod 9 away from the hydraulic cylinder 8 is welded to the lower surface of the sliding plate 3. The positioning mechanism 5 includes a first limiting ring 51. A positioning cylinder 52 is rotatably connected to the inner cavity of the first limiting ring 51. A first limiting groove 53 is welded to the outer surface of the positioning cylinder 52. A first ball bearing 54 is rotatably connected to the inner cavity of the first limiting groove 53. The first ball bearing 54 is frictionally adapted to the inner wall of the first limiting ring 51. By setting the hydraulic cylinder 8, the moving rod 9 can drive the sliding plate 3 during operation. The moving plate 3 moves, which in turn causes the sliding plate 3 to drive the positioning mechanism 5 to move at the limit box 2. Ultimately, the drill rod part of the PDC drill bit held by the positioning mechanism 5 moves towards the drill part of the PDC drill bit. By setting the first limit groove 53, the first ball 54 can rotate in its inner cavity. By setting the first limit ring 51, the positioning cylinder 52 can rotate at its inner ring. When the positioning cylinder 52 rotates, the first ball 54 contacts the inner wall of the first limit ring 51, thereby causing the first ball 54 to rotate and reducing the friction force on the positioning cylinder 52 when it rotates.

[0021] A threaded ring 55 is threaded through the outer surface of the positioning cylinder 52. There are several threaded rings 55, and they are evenly distributed. A threaded post 56 is threadedly connected to the inner cavity of the threaded ring 55. A soft pad 57 is fixedly connected to one end of the threaded post 56 in the inner cavity of the positioning cylinder 52. By setting the threaded ring 55, the threaded post 56 can be limited, so that when the threaded post 56 rotates, the soft pad 57 at the end can move toward the drill rod part of the PDC drill bit, thereby completing the positioning of the drill rod of the PDC drill bit in the inner cavity of the positioning cylinder 52.

[0022] A second limiting groove 76 is welded to the outer surface of the positioning frame 71. A second ball bearing 77 is rotatably connected to the inner cavity of the second limiting groove 76. The second ball bearing 77 is frictionally fitted with the inner wall of the second limiting ring 6. A gear ring 75 is welded to the outer surface of the positioning frame 71. The fixing mechanism 7 also includes a stepper motor 72, which is fixedly connected to the upper surface of the limiting box 2. A rotating rod 73 is mounted on the output end of the stepper motor 72 via a coupling. A gear 74 is fixedly connected to the end of the rotating rod 73. The gear 74 meshes with the gear ring 75. By setting the stepper motor 72, after the power is connected and the switch is turned on, the output end of the stepper motor 72 drives the rotating rod 73 to rotate, thereby causing the gear 74 to rotate. By setting the gear 74, the rotating rod 73 can rotate. During rotation, the toothed ring 75 rotates, which in turn causes the positioning frame 71 and the toothed ring 75 to rotate within the inner cavity of the second limiting ring 6, ultimately rotating the drill bit portion of the PDC drill bit. The tightening mechanism 78 includes a connecting post 781, which is welded to the inner wall of the positioning frame 71. An internally threaded tube 782 is welded to the end of the connecting post 781 furthest from the positioning frame 71. A threaded disc 786 is threadedly connected to the inner cavity of the internally threaded tube 782. A sealing ring 787 is fixedly connected to the outer surface of the threaded disc 786, and the sealing ring 787 rubs against the inner wall of the internally threaded tube 782. By setting the tightening mechanism 78, the clamping mechanism 79 can be adjusted after the drill bit portion of the PDC drill bit is placed, thereby allowing the clamping mechanism 79 to clamp the drill head of the PDC drill bit. The screw disc 786 is clamped and limited by an internally threaded tube 782, allowing it to move laterally within the inner cavity of the internally threaded tube 782 as it rotates. A sealing ring 787 compresses the air within the internal cavity of the internally threaded tube 782 as the screw disc 786 moves. A support frame 788 is riveted to the side of the screw disc 786 away from the sealing ring 787. A sliding tube 789 is welded to the end of the support frame 788 away from the screw disc 786. The sliding tube 789 is fitted onto the outer surface of the internally threaded tube 782, and an anti-slip ring 7810 is welded to the end of the sliding tube 789. A conical barrel 7811 is welded to the outer surface of the sliding tube 789. The support frame 788 supports the screw disc 786 and allows it to move laterally within the inner cavity of the internally threaded tube 782 as it rotates. When 810 and the support frame 788 are in motion, the threaded disc 786 rotates together, causing the sliding tube 789 and the conical barrel 7811 to move. A flexible tube 783 passes through the outer surface of the internally threaded tube 782 near the connecting post 781. An arc-shaped tube 784 passes through the end of the flexible tube 783 away from the internally threaded tube 782. Telescopic tubes 785 pass through both sides of the arc-shaped tube 784. There are three telescopic tubes 785 and three arc-shaped tubes 784, spaced apart. The arc-shaped tube 784 is frictionally fitted against the outer surface of the conical barrel 7811. By using the flexible tube 783, when the arc-shaped tube 784 is compressed as it moves with the conical barrel 7811 and the sliding tube 789, the flexible tube 783 deforms.This does not affect the movement of the arc-shaped tube 784, while allowing the internally threaded tube 782 and the arc-shaped tube 784 to communicate spatially.

[0023] There are three clamping mechanisms 79, which are evenly distributed on the outer surface of the positioning frame 71. Each clamping mechanism 79 includes a limiting frame 791, which is welded to the outer surface of the positioning frame 71. A rolling bearing 792 is fixedly connected to the inner wall of the limiting frame 791, and a rotating column 793 is fixedly connected to the inner ring of the rolling bearing 792. A rotating frame 794 is welded to the end of the rotating column 793. By setting three clamping mechanisms 79, the drill bit portion of the PDC drill bit to be welded can be clamped. Furthermore, the drill bit portion of the PDC drill bit is clamped to prevent loosening during rotation and welding. A rolling bearing 792 ensures stable rotation of the rotating column 793 and the rotating frame 794 within the cavity of the limiting frame 791. A connecting pipe 795 is fixedly connected to the outer surface of the rotating frame 794, with its end penetrating an arc-shaped pipe 784. A support plate 796 is welded to the end of the rotating frame 794 away from the arc-shaped pipe 784, and an anti-slip strip is riveted to the end of the support plate 796 away from the connecting pipe 795. 797. A limiting tube 798 is riveted to one end of the support plate 796 away from the rotating frame 794. A connecting cover 799 is welded to the opening on the upper surface of the limiting tube 798. The end of the connecting tube 795 away from the arc-shaped tube 784 is welded to the inner wall of the connecting cover 799. A piston 7910 is slidably connected to the inner cavity of the limiting tube 798. A piston rod 7911 is welded to the lower surface of the piston 7910. A clamping plate 7912 is welded to the bottom end of the piston rod 7911. By setting the connecting tube 795, the arc-shaped tube 784 and the limiting tube can be connected. When the internal air pressure of the arc-shaped tube 784 changes, the gas enters the inner cavity of the limiting tube 798 through the connecting tube 795. By setting the limiting tube 798, the piston 7910 can be limited. When the internal air pressure increases, the piston 7910 moves in the inner cavity of the limiting tube 798, which in turn causes the piston rod 7911 to drive the clamping plate 7912 to move towards the drill bit part of the PDC drill bit. This, in turn, cooperates with the anti-slip strip 797 to achieve the positioning and clamping of the drill bit part of the PDC drill bit.

[0024] Working principle: During use, the operator places the drill rod portion of the PDC drill bit to be welded into the inner cavity of the positioning cylinder 52. Then, the threaded post 56 is rotated, moving within the inner cavity of the threaded ring 55. This causes the soft pad 57 to press against the drill rod portion of the PDC drill bit within the inner cavity of the positioning cylinder 52, aligning the axis of the drill rod portion of the PDC drill bit with the axis of the positioning cylinder 52. Finally, the drill rod portion of the PDC drill bit is placed into the inner cavity of the positioning frame 71. The drill bit protrusion is aligned with the positioning hole 710. Then, the anti-slip ring 7810 is rotated, causing the support frame 788 to rotate the threaded disc 786 within the internal threaded tube 782. This causes the support frame 788 and sliding tube 789 to press against the conical barrel 7811 and the arc-shaped tube 784, which in turn causes the arc-shaped tube 784 and connecting tube 795 to rotate the rotating frame 794. Finally, the anti-slip strip 797 moves towards the outer surface of the PDC drill bit, completing the PDC drill bit's rotation. During the clamping operation of the DC drill bit, as the threaded disc 786 and sealing ring 787 move within the inner cavity of the internal threaded tube 782, the air within the inner cavity of the internal threaded tube 782 is compressed. This airflow then enters the inner cavity of the limiting tube 798 through the connecting pipe 795, ultimately causing the piston 7910 and piston rod 7911 to move within the inner cavity of the limiting tube 798. This, in turn, causes the clamping plate 7912 to clamp and position the drill bit portion of the PDC drill bit. After positioning, the operator controls the hydraulic cylinder 8 and moves the sliding plate 3 at the end of the moving rod 9 within the inner cavity of the limiting box 2. This ultimately brings the drill rod portion of the PDC drill bit and the drill bit portion of the PDC drill bit together. Welding equipment is then used to weld the interface. Afterward, the stepper motor 72 is connected to the power supply and the switch is turned on, causing the rotating rod 73 to drive the gear 74 to rotate. This ultimately causes the gear ring 75 to drive the drill bit portion and the drill rod portion of the PDC drill bit to rotate, completing the circumferential welding effect.

[0025] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A fixing device for welding PDC drill bits, comprising a frame (1), wherein a limit box (2) is welded to the top of the frame (1), a sliding plate (3) is slidably connected to the inner cavity of the limit box (2), and universal wheels (4) are riveted to the corners of the lower surface of the sliding plate (3), characterized in that: The upper surface of the sliding plate (3) is provided with a positioning mechanism (5), which is used to position and clamp the drill rod of the PDC drill bit; the upper surface of the limiting box (2) is welded with a second limiting ring (6), and a fixing mechanism (7) is provided in the inner cavity of the second limiting ring (6), which is used to position and clamp the drill bit of the PDC drill bit. The fixing mechanism (7) includes a positioning frame (71), which is rotatably connected to the inner cavity of the second limiting ring (6). The outer surface of the positioning frame (71) is provided with positioning holes (710), and there are several positioning holes (710), which are evenly distributed. The positioning holes (710) are used to align with the protrusion of the PDC drill bit. The inner wall of the positioning frame (71) is provided with a tightening mechanism (78), and the outer surface of the positioning frame (71) is provided with a clamping mechanism (79).

2. The fixing device for PDC drill bit welding according to claim 1, characterized in that: A hydraulic cylinder (8) is fixedly connected to the lower surface of the limiting box (2). A moving rod (9) is provided at the output end of the hydraulic cylinder (8). The end of the moving rod (9) away from the hydraulic cylinder (8) is welded to the lower surface of the sliding plate (3). The positioning mechanism (5) includes a first limiting ring (51). A positioning cylinder (52) is rotatably connected to the inner cavity of the first limiting ring (51). A first limiting groove (53) is welded to the outer surface of the positioning cylinder (52). A first ball (54) is rotatably connected to the inner cavity of the first limiting groove (53). The first ball (54) is frictionally adapted to the inner wall of the first limiting ring (51).

3. A fixing device for welding PDC drill bits according to claim 2, characterized in that: The outer surface of the positioning cylinder (52) is perforated with a threaded ring (55). There are several threaded rings (55) and they are evenly distributed. A threaded post (56) is threadedly connected to the inner cavity of the threaded ring (55). A soft pad (57) is fixedly connected to one end of the threaded post (56) located in the inner cavity of the positioning cylinder (52).

4. A fixing device for welding PDC drill bits according to claim 3, characterized in that: The outer surface of the positioning frame (71) is welded with a second limiting groove (76), and a second ball (77) is rotatably connected to the inner cavity of the second limiting groove (76). The second ball (77) is frictionally adapted to the inner wall of the second limiting ring (6). The outer surface of the positioning frame (71) is welded with a toothed ring (75). The fixing mechanism (7) also includes a stepper motor (72). The stepper motor (72) is fixedly connected to the upper surface of the limiting box (2). The output end of the stepper motor (72) is equipped with a rotating rod (73) through a coupling. The end of the rotating rod (73) is fixedly connected with a gear (74). The gear (74) meshes with the toothed ring (75).

5. A fixing device for welding PDC drill bits according to claim 4, characterized in that: The tightening mechanism (78) includes a connecting post (781), which is welded to the inner wall of the positioning frame (71). An internally threaded tube (782) is welded to one end of the connecting post (781) away from the positioning frame (71). A threaded disc (786) is threadedly connected to the inner cavity of the internally threaded tube (782). A sealing ring (787) is fixedly connected to the outer surface of the threaded disc (786). The sealing ring (787) is frictionally adapted to the inner wall of the internally threaded tube (782).

6. A fixing device for welding PDC drill bits according to claim 5, characterized in that: A support frame (788) is riveted to the side of the threaded disc (786) away from the sealing ring (787). A sliding tube (789) is welded to the end of the support frame (788) away from the threaded disc (786). The sliding tube (789) is sleeved on the outer surface of the internal threaded tube (782). An anti-slip ring (7810) is welded to the end of the sliding tube (789). A conical barrel (7811) is welded to the outer surface of the sliding tube (789).

7. A fixing device for welding PDC drill bits according to claim 6, characterized in that: A flexible tube (783) is inserted through the outer surface of the internally threaded tube (782) near the connecting post (781). An arc-shaped tube (784) is inserted through the end of the flexible tube (783) away from the internally threaded tube (782). Telescopic tubes (785) are inserted through both sides of the arc-shaped tube (784). There are three telescopic tubes (785) and arc-shaped tubes (784), and the three telescopic tubes (785) and arc-shaped tubes (784) are spaced apart. The arc-shaped tube (784) is frictionally adapted to the outer surface of the conical barrel (7811).

8. A fixing device for welding PDC drill bits according to claim 7, characterized in that: The number of clamping mechanisms (79) is three, and the three clamping mechanisms (79) are evenly distributed on the outer surface of the positioning frame (71). Each clamping mechanism (79) includes a limiting frame (791), which is welded to the outer surface of the positioning frame (71). A rolling bearing (792) is fixedly connected to the inner wall of the limiting frame (791), and a rotating column (793) is fixedly connected to the inner ring of the rolling bearing (792). A rotating frame (794) is welded to the end of the rotating column (793).

9. A fixing device for welding PDC drill bits according to claim 8, characterized in that: A connecting pipe (795) is fixedly connected to the outer surface of the rotating frame (794). The end of the connecting pipe (795) passes through an arc-shaped pipe (784). A support plate (796) is welded to the end of the rotating frame (794) away from the arc-shaped pipe (784). An anti-slip strip (797) is riveted to the end of the support plate (796) away from the connecting pipe (795). A limit tube (797) is riveted to the end of the support plate (796) away from the rotating frame (794). 98), a connecting cover (799) is welded to the opening on the upper surface of the limiting tube (798), and the end of the connecting tube (795) away from the arc tube (784) is welded to the inner wall of the connecting cover (799). A piston (7910) is slidably connected to the inner cavity of the limiting tube (798), and a piston rod (7911) is welded to the lower surface of the piston (7910). A clamping plate (7912) is welded to the bottom end of the piston rod (7911).

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