Automatic PTA surfacing method for wear layer of reamer drill bit

Abstract

The application discloses a kind of automatic PTA surfacing methods of reamer drill bit wear-resistant layer, uses new type of automatic PTA surfacing system to carry out surfacing operation, and the reamer drill bit is surfaced with corrugated curved shape surfacing wear-resistant layer, the wear resistance of reamer and drilling performance are increased.High-hardness surfacing layer increases the service life of reamer, and stable arc voltage tracking function and welding parameter, ensure that the metallographic structure of surfacing layer tungsten carbide particle is evenly distributed, without bottoming and burning loss, and alloy weld layer has no peeling phenomenon.

Description

Technical Field

[0001] This invention relates to the field of surfacing welding, and more particularly to an automated PTA surfacing welding method for the wear-resistant layer of a hole expander drill bit. Background Technology

[0002] In the oil drilling industry, reaming technology has a wide range of applications. With the continuous development of oil drilling technology in various countries, its role and importance have become increasingly significant. The reamer, involved in reaming technology, is particularly crucial. During oil drilling, the drill bit continuously rotates and applies pressure, and the reamer directly rubs against the rock formation, requiring extremely high hardness. Overlaying cemented carbide onto the reamer surface is one effective method to improve its surface hardness. Currently, most surface overlays are done using MIG welding or manual cemented carbide welding, which can easily lead to the following problems:

[0003] 1. The weld overlay surface has many welding defects such as porosity, slag inclusions, and lack of fusion, resulting in unstable welding quality. 2. MIG welding or manual welding of cemented carbide surfaces produces numerous network cracks, leading to the alloy weld layer peeling off after welding. 3. The tungsten carbide particles in the weld overlay microstructure are unevenly distributed, with sedimentation and burn-off. 4. For large workpieces, welding efficiency is low, increasing construction costs. Summary of the Invention

[0004] Purpose of the invention: To address the shortcomings and defects of existing technologies, this invention provides an automated PTA overlay welding method for the wear-resistant layer of a borehole reamer drill bit. The overlay welded wear-resistant layer of the borehole reamer drill bit has a corrugated curved shape, which increases the wear resistance and drilling performance of the reamer.

[0005] Technical solution: The present invention provides an automated PTA overlay welding method for the wear-resistant layer of a hole reamer drill bit, comprising the following steps:

[0006] 1) The plasma generator of the automated PTA cladding system adopts a Fronius TT5000 job G / F type welding machine with a welding current of 3A-500A and an open-circuit voltage of 86V. It is installed on the welding power source via the TT2200 carriage crossbeam. The welding power source adopts a Fronius TT2200 power supply with an adjustable plasma current of 3A-50A, a plasma gas adjustment range of 0.2L / min-10L / min, and an adjustment accuracy of 0.01L / min.

[0007] 2) The powder feeder 1 and powder feeder 2 of the automated PTA cladding system adopt SFQ-A-001 scraper-type powder feeders with a powder feeding rate of 0.4g / min-300g / min and a powder particle size of 20μm-250μm; the plasma powder spraying welding gun has a welding current of 30A-250A and a powder particle size of 45μm-200μm;

[0008] 3) Turn on the main power switch on the control cabinet, and simultaneously turn on the plasma generator and welding power supply; place the reamer drill bit workpiece on the positioner turntable, and clamp the workpiece by rotating the single-acting chuck.

[0009] 4) Use a handheld teaching pendant to flip the positioner turntable to a horizontal position so that the workpiece is placed horizontally on the towing wheel, which supports the workpiece; raise the lifting column and move the plasma powder spraying welding gun to the area to be welded by moving the telescopic crossbeam, so that the plasma powder spraying welding gun is flush with the area to be welded of the workpiece.

[0010] 5) Set welding parameters by calling the welding JOB in the program. JOB 0 is for arc initiation parameters: current 100A, arc rise time 1s, pre-gas supply time 3s, and post-powder supply time 2s. JOB 1 is for welding parameters: welding current 160A, plasma current 15A, welding speed 80mm / min, oscillation width 15mm, oscillation speed 500mm / min, welding shielding gas flow rate 15L / min, center gas flow rate 1.5L / min, and powder supply gas flow rate 3L / min.

[0011] 6) The welding powder is a mixture of Ni45 and nickel-based tungsten carbide. The particle size of Ni45 is 150-325 mesh, accounting for 40%, and the particle size of nickel-based tungsten carbide is 48-150 mesh, accounting for 60%. The powder feeding rate is set to 15g / min during the welding process. The surfacing operation is carried out to surface a corrugated curved wear-resistant layer on the reamer drill bit, thus completing the automated PTA surfacing of the wear-resistant layer of the reamer drill bit.

[0012] The automated PTA cladding system includes a welding mechanism, a moving cross mechanism, a welding torch oscillation mechanism, and a workpiece holding mechanism. The welding mechanism includes a plasma generator, a welding power source, a first powder feeder, a second powder feeder, and a plasma powder spraying torch connected in sequence. The moving cross mechanism includes a control cabinet, an integrated base, a rack and pinion guide rail, and a lifting column. A movable base is mounted on the rack and pinion guide rail, and a base servo motor with a gear is installed on the movable base. The gear meshes with the rack and pinion guide rail gear. A crossbeam servo motor with a gear body is installed on the lifting column, and the gear body meshes with the guide rail gear on the lifting column. The lifting column has a telescopic crossbeam, and the end of the telescopic crossbeam has a slide and a tank chain.

[0013] The welding torch oscillation mechanism includes a slide and a fixed support plate. A slider is provided on the sliding guide rail of the slide, and a lead screw is provided inside the slide, which is connected to the oscillation servo motor. The plasma powder spraying welding torch is connected to the adapter plate and the slider by screws. The workpiece holding mechanism includes a positioner body, a support bracket body, a support bracket buffer block, and a single-acting chuck. The positioner body is provided with a semi-circular flip gear device, and the semi-circular flip gear device is provided with a positioner turntable. The support bracket body is mounted on a support bracket linear guide rail and is provided with a drag wheel frame.

[0014] The vertical lifting stroke of the lifting column is 1500mm, and the lifting speed is 20mm / min-2000mm / min; the telescopic crossbeam has a telescopic stroke of 1000mm and a horizontal moving speed of 20mm / min-2000mm / min; the moving base has a moving stroke ≥1500mm.

[0015] The positioner turntable has a rotation speed of 0.01 rpm to 1 rpm, a rotation accuracy of ≤0.12°, and a load capacity of ≤1000 kg; the workpiece diameter of the trolley is in the range of 80 mm to 300 mm; the oscillation accuracy of the slider is ±0.1 mm, and the oscillation speed is 40 mm / min to 4000 mm / min.

[0016] The integrated base adopts an integrated steel structure, and several leveling feet are installed around the integrated base. Buffer blocks are installed on the edge of the integrated base.

[0017] The movable base is equipped with a limit valve.

[0018] The tow wheel frame is equipped with a tow wheel, and the tow wheel frame and the tow wheel are connected by bearings. The edge of the tow wheel frame is equipped with a tow wheel lifting device.

[0019] The tugboat lifting device is equipped with a lifting scale on its side.

[0020] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The wear-resistant layer of the borehole reamer drill bit after welding is corrugated and curved, which increases the wear resistance and drilling performance of the reamer; the mixed filler welding powder according to the process requirements ratio makes the surface hardness of the welded wear-resistant layer reach 60HRC, and the high hardness welded layer increases the service life of the reamer; the stable arc voltage tracking function and welding parameters ensure that the tungsten carbide particles in the metallographic structure of the welded layer are evenly distributed, without settling or burning, and the alloy weld layer does not peel off. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the wear-resistant overlay layer of the present invention;

[0022] Figure 2 This is a schematic diagram of the automated PTA overlay welding system of the present invention. Figure 1 ;

[0023] Figure 3 This is a schematic diagram of the automated PTA overlay welding system of the present invention. Figure 2 ;

[0024] Figure 4 This is a side view of the automated PTA overlay welding system of the present invention.

[0025] In the diagram, 1 is the control cabinet; 2 is the plasma generator; 3 is the welding power supply; 4 is the integrated base; 5 is the leveling bracket; 6 is the rack and pinion guide; 7 is the buffer block; 8 is the linear guide rail of the support bracket; 9 is the buffer block of the support bracket; 10 is the towing wheel frame; 11 is the support bracket body; 12 is the movable base; 13 is the limit valve; 14 is the base servo motor; 15 is the lifting column; 16 is the telescopic crossbeam; 17 is the crossbeam servo motor; 18 is powder feeder one; 19 is powder feeder two; 20 is the slider; 21 is the slide; 22 is the plasma powder spraying welding gun; 23 is the positioner turntable; 24 is the semi-circular flip gear device; 25 is the positioner body; 26 is the lifting scale; 27 is the towing wheel lifting device; 28 is the towing wheel; 29 is the tank chain; 30 is the swing servo motor; 31 is the fixed support plate; 32 is the single-action claw; 33 is the gear; and 34 is the wear-resistant overlay layer. Detailed Implementation

[0026] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] An automated PTA overlay welding method for the wear-resistant layer of a hole reamer drill bit according to the present invention includes the following steps:

[0028] 1) The plasma generator 2 of the automated PTA cladding system adopts a Fronius TT5000 job G / F type welding machine with a welding current of 3A-500A and an open-circuit voltage of 86V. It is installed on the welding power source 3 via the TT2200 carriage crossbeam. The welding power source 3 adopts a Fronius TT2200 power supply with an adjustable plasma current of 3A-50A, a plasma gas adjustment range of 0.2L / min-10L / min, and an adjustment accuracy of 0.01L / min.

[0029] 2) The powder feeder 18 and powder feeder 29 of the automated PTA cladding system adopt SFQ-A-001 scraper-type powder feeders, with a powder feeding rate of 0.4g / min-300g / min and a powder particle size of 20μm-250μm; the plasma powder spraying torch 22 has a welding current of 30A-250A and a powder particle size of 45μm-200μm; the powder application rate is ≥90% when cladding cobalt-based and nickel-based powders.

[0030] 3) Turn on the main power switch on the control cabinet 1, and simultaneously turn on the plasma generator 2 and welding power supply 3; place the reamer drill bit workpiece on the positioner turntable 23, and clamp the workpiece by rotating the single-acting chuck 32.

[0031] 4) Use a handheld teaching pendant to flip the positioner turntable 23 to a horizontal position so that the workpiece is placed horizontally on the towing wheel 28, and the towing wheel 28 supports the workpiece; raise the lifting column 15, and move the plasma powder spraying welding gun 22 to the area to be welded by moving the telescopic crossbeam 16, so that the plasma powder spraying welding gun 22 is flush with the area to be welded of the workpiece.

[0032] 5) Set welding parameters by calling the welding JOB in the program. JOB 0 is for arc initiation parameters: current 100A, arc rise time 1s, pre-gas supply time 3s, and post-powder supply time 2s. JOB 1 is for welding parameters: welding current 160A, plasma current 15A, welding speed 80mm / min, oscillation width 15mm, oscillation speed 500mm / min, welding shielding gas flow rate 15L / min, center gas flow rate 1.5L / min, and powder supply gas flow rate 3L / min.

[0033] 6) The welding powder is a mixture of Ni45 and nickel-based tungsten carbide. The particle size of Ni45 is 150-325 mesh, accounting for 40%, and the particle size of nickel-based tungsten carbide is 48-150 mesh, accounting for 60%. The powder feeding rate is set to 15g / min during the welding process. The surfacing operation is carried out to surface a corrugated curved wear-resistant layer 34 on the reamer drill bit, thus completing the automated PTA surfacing of the wear-resistant layer of the reamer drill bit.

[0034] The lifting column 15 has a vertical lifting stroke of 1500mm and a lifting speed of 20mm / min-2000mm / min; the telescopic beam 16 has a telescopic stroke of 1000mm and a horizontal movement speed of 20mm / min-2000mm / min; the movable base 12 has a movement stroke ≥1500mm. The positioner turntable 23 has a rotation speed of 0.01rpm-1rpm, a rotation accuracy ≤0.12°, and a load capacity ≤1000kg; the workpiece diameter range of the drag roller 28 is 80mm-300mm; the swing accuracy of the slider 20 is ±0.1mm, and the swing speed is 40mm / min-4000mm / min. The travel of the carriage 21 can reach ±50mm.

[0035] The automated PTA cladding system of the present invention includes a welding mechanism, a moving cross mechanism, a welding torch oscillation mechanism, and a workpiece holding mechanism. The welding mechanism includes a plasma generator 2, a welding power source 3, a powder feeder 18 and a powder feeder 29, and a plasma powder spraying welding torch 22 connected in sequence. The moving cross mechanism includes a control cabinet 1, an integrated base 4, a rack and pinion guide rail 6, and a lifting column 15. A movable base 12 is provided on the rack and pinion guide rail 6, and a base servo motor 14 with a gear 33 is installed on the movable base 12. The gear 33 meshes with the gear on the rack and pinion guide rail 6. A crossbeam servo motor 17 with a gear body is installed on the lifting column 15. The gear body meshes with the guide rail gear on the lifting column 15. The lifting column 15 is provided with a telescopic crossbeam 16, and a slide 21 and a tank chain 29 are provided at the end of the telescopic crossbeam 16. The welding torch oscillation mechanism includes a slide 21 and a fixed support plate 31. A slider 20 is mounted on the sliding guide rail of the slide 21. A lead screw is installed inside the slide 21, connected to the oscillation servo motor 30, thereby enabling the slider 20 to oscillate linearly. The plasma powder spraying welding torch 22 is connected to the adapter plate and slider 20 via screws. The workpiece holding mechanism includes a positioner body 25, a support bracket body 11, a support bracket buffer block 9, and a single-acting chuck 32. The positioner body 25 is equipped with a semi-circular flip gear device 24. The flip operation is achieved through the output gear on the AC servo motor reducer mounted at the bottom, which drives the semi-circular flip gear mechanism 24. The flip angle range is 0-100°. The semi-circular flip gear device 24 is equipped with a positioner turntable 23. The rotation of the rotary support is driven by a small gear mounted on the motor, causing the worktable to rotate. This meets the requirements of a wide speed range, allowing for stepless speed regulation within the speed adjustment range. The support bracket body 11 is mounted on the support bracket linear guide rail 8 and can move back and forth. The support bracket body 11 is equipped with a caster wheel 10 and is fixed by screws.

[0036] The integrated base 4 adopts a one-piece steel structure, welded from high-quality steel plates and profiles, facilitating the overall installation and positioning of the equipment. Several adjustable leveling feet 5 are installed around the integrated base 4 to adjust its horizontal position. Buffer blocks 7 are installed along the edges of the integrated base 4, providing cushioning protection when the movable base 12 moves to the edge. A limit valve 13 is installed on the movable base 12; when the movable base 12 moves to the edge of the integrated base 4, it will contact the limit valve 13, triggering an alarm device to prevent the movable base 12 from exceeding its track travel. The towing frame 10 is equipped with towing wheels 28, connected to the towing wheels 28 via bearings. A towing lifting device 27 is located at the edge of the towing frame 10. A lifting scale 26 is located on the side of the towing lifting device 27, allowing adjustment of the towing frame 10's height by observing the scale on the lifting scale 26. Powder feeder 18 and powder feeder 2 19 are mounted on a powder feeder bracket. The bracket has several screw holes at its bottom, and is mounted on the telescopic crossbeam 16 using screws passing through these holes. The rack and pinion guide 6 has several screw holes and is connected to the integrated base 4 using screws passing through these holes. The base servo motor 14 is connected to the movable base 12 using screws. The lifting column 15 has several bolt holes at its bottom and is connected to the movable base 12 using screws passing through these holes. The crossbeam servo motor 17 is connected to the lifting column 15 using screws. The positioner body 25 has several bolt holes and is fixed to the integrated base 4 using screws passing through these holes.

[0037] When using the automated PTA overlay welding system of the present invention: 1) Several base fixing ribs 5 are provided on the edge of the integrated base 4, which are fixed to the ground with expansion screws through the bolt holes on the components. 2) The movable base 12 is placed on the rack and pinion guide rail 6 provided on the integrated base 4. The base servo motor 14 is installed on the movable base 12. The base servo motor 14 is provided with gear 33. The base servo motor 14 and the movable base 12 are fixed with screws. The gear 33 meshes with the gear of the rack and pinion guide rail 6, thereby realizing the linear movement of the entire cross operating frame. 3) Several bolt holes are provided on the bottom mounting chassis of the lifting column 15, and it is fixedly connected to the movable base 12 with screws. 4) The telescopic crossbeam 16 is installed horizontally on the lifting column 15 and fixed to the lifting column 15 through the adapter plate. 5) The crossbeam servo motor 17 is installed on the telescopic crossbeam 16. The crossbeam servo motor 17 is provided with gear body and engages with the linear guide rail on the lifting column 15. 6) The slide 21 is fixed to the end of the telescopic beam 16 by screws. The slider 20 is inserted into the slide 21 via a sliding guide rail. The slide 21 has a lead screw inside, which is rotated by the swing servo motor 30, thereby realizing the linear reciprocating swing of the slider 20. 7) The plasma powder spraying torch 22 is fixed to the adapter plate by screws. The adapter plate has several bolt holes and is fixed to the slide 21 by screws. 8) The plasma powder spraying torch 22 has an inlet and an outlet, as well as a torch cable. The pipeline is routed using a tank chain 29 and connected to the plasma generator 2 and the welding power supply 3. 9) Powder feeder 18 and powder feeder 29 are installed on the powder feeder bracket. The bottom of the powder feeder bracket has several bolt holes and is installed on the telescopic beam 16 by screws. 10) The plasma powder spraying torch 22 has a powder feeding port. The powder feeding tubes of powder feeder 18 and powder feeder 29 are inserted into the powder feeding port on the plasma powder spraying torch 22. 11) The positioner body 25 is horizontally placed on the integrated base 4. The positioner body 25 is provided with several fixing ribs, which are fixed to the integrated base 4 through bolt holes on the fixing ribs. 12) The positioner turntable 23 is provided with 4 single-acting claws 32. The reverse side of the single-acting claws 32 is provided with threaded holes. Screws are used to fix the single-acting claws 32 through the mounting groove on the back of the positioner turntable 23. 13) The conductive device is installed at the bottom of the positioner turntable 23. It is a copper rod with a butterfly spring tensioned in contact with the rotary worktable. A soft cable wire is connected to the lower end of the base to conduct welding current. 14) The towing frame 10 is placed on the linear guide rail 8 of the support bracket. The towing frame is provided with a hydraulic device. The height of the towing frame 10 can be adjusted by rotating the towing lifting device 27.

[0038] The existing technology suffers from the following problems: 1. Numerous welding defects such as porosity, slag inclusions, and lack of fusion on the surface of the weld overlay, resulting in unstable welding quality. 2. Many network cracks appear on the surface of MIG welding or manual welding of cemented carbide, leading to peeling of the alloy weld overlay after welding. 3. The tungsten carbide particles in the metallographic structure of the weld overlay are unevenly distributed, with sedimentation and burn-off. 4. For large workpieces, the welding efficiency is low, increasing construction costs.

[0039] This invention addresses the following key aspects: 1. The equipment achieves welding of different workpieces by calling different programs. The welding process is adjusted by calling welding JOBs within the programs. These welding JOBs include parameters such as powder feed rate and ion gas flow rate, achieving integrated multi-parameter control. This more effectively controls issues like network cracks and alloy weld layer peeling on the cemented carbide surface, ensuring welding quality. 2. The equipment can oscillate along the X and Y axes for welding, ensuring aesthetically pleasing weld formation and consistent width. 3. The equipment features arc voltage tracking. During welding, the welding torch height can be adjusted in real-time according to the arc voltage, ensuring uniform delivery of the weld to the arc pool and effectively preventing uneven distribution of tungsten carbide particles in the weld overlay. 4. All moving axes are driven by servo motors, resulting in a high degree of automation, high welding efficiency, and reduced labor and management costs.

[0040] The automated PTA overlay welding method for the wear-resistant layer of the reamer drill bit of this invention is used for overlay welding operations. During equipment operation, the welding torch and stand are stable without any shaking that would affect the welding quality. The equipment also has an arc voltage tracking function, allowing the welding torch height position to be adjusted in real time according to the arc voltage during welding, ensuring uniformity of the molten wire and weld width. The overlay wear-resistant layer 34 of the reamer drill bit after welding has a corrugated shape, increasing the wear resistance and drilling performance of the reamer. The mixed filler welding powder, in proportions required by the process, achieves a surface hardness of 60 HRC for the overlay wear-resistant layer 34. The high hardness of the overlay layer increases the service life of the reamer. The stable arc voltage tracking function and welding parameters ensure that the tungsten carbide particles in the metallographic structure of the overlay layer are evenly distributed, without settling or burning, and the alloy weld layer does not peel off.

Claims

1. An automated PTA overlay welding method for the wear-resistant layer of a hole reamer drill bit, characterized in that: Includes the following steps: 1) The plasma generator (2) of the automated PTA cladding system adopts a Fronius TT5000 job G / F type welding machine with a welding current of 3A-500A and an open voltage of 86V. It is installed on the welding power source (3) through the TT2200 trolley beam. The welding power source (3) adopts a Fronius TT2200 power supply with an adjustable plasma current of 3A-50A, a plasma gas adjustment range of 0.2L / min-10L / min, and an adjustment accuracy of 0.01L / min. 2) The powder feeder 1 (18) and powder feeder 2 (19) of the automated PTA cladding system adopt SFQ-A-001 scraper-type powder feeders with a powder feeding rate of 0.4g / min-300g / min and a powder particle size of 20μm-250μm; the plasma powder spraying torch (22) has a welding current of 30A-250A and a powder particle size of 45μm-200μm; 3) Turn on the main power switch on the control cabinet (1) and simultaneously turn on the plasma generator (2) and welding power supply (3); place the reamer drill bit workpiece on the positioner turntable (23) and clamp the workpiece by rotating the single-acting chuck (32); 4) Use a handheld teaching pendant to flip the positioner turntable (23) to a horizontal position so that the workpiece is placed horizontally on the towing wheel (28) and the towing wheel (28) supports the workpiece; raise the lifting column (15) and move the plasma powder spraying welding gun (22) to the area to be welded by moving the telescopic crossbeam (16), so that the plasma powder spraying welding gun (22) is flush with the area to be welded of the workpiece; 5) Set welding parameters by calling the welding JOB in the program. JOB 0 is for arc initiation parameters: current 100A, arc rise time 1s, pre-gas supply time 3s, and post-powder supply time 2s. JOB 1 is for welding parameters: welding current 160A, plasma current 15A, welding speed 80mm / min, oscillation width 15mm, oscillation speed 500mm / min, welding shielding gas flow rate 15L / min, center gas flow rate 1.5L / min, and powder supply gas flow rate 3L / min. 6) The welding powder is a mixture of Ni45 and nickel-based tungsten carbide. The particle size of Ni45 is 150-325 mesh, accounting for 40%, and the particle size of nickel-based tungsten carbide is 48-150 mesh, accounting for 60%. The powder feeding rate is set to 15g / min during the welding process. The surfacing operation is carried out to surface a corrugated curved wear-resistant layer (34) on the reamer drill bit, and the automated PTA surfacing of the wear-resistant layer of the reamer drill bit is completed.

2. The automated PTA overlay welding method for the wear-resistant layer of the reamer drill bit according to claim 1, characterized in that: The automated PTA cladding system includes a welding mechanism, a moving cross mechanism, a welding torch swing mechanism, and a workpiece holding mechanism. The welding mechanism includes a plasma generator (2), a welding power source (3), a first powder feeder (18), a second powder feeder (19), and a plasma powder spraying welding torch (22) connected in sequence. The moving cross mechanism includes a control cabinet (1), an integrated base (4), a rack and pinion rail (6), and a lifting column (15). A movable base (12) is provided on the rack and pinion rail (6). A base servo motor (14) with a gear (33) is installed on the movable base (12). The gear (33) meshes with the rack and pinion rail (6). A beam servo motor (17) with a gear body is installed on the lifting column (15). The gear body meshes with the guide rail on the lifting column (15). The lifting column (15) is provided with a telescopic beam (16). A slide (21) and a tank chain (29) are provided at the end of the telescopic beam (16).

3. The automated PTA overlay welding method for the wear-resistant layer of the reamer drill bit according to claim 2, characterized in that: The welding torch swing mechanism includes a slide (21) and a fixed support plate (31). A slider (20) is provided on the sliding guide rail of the slide (21). A lead screw is provided inside the slide (21) and the lead screw is connected to the swing servo motor (30). The plasma powder spraying welding torch (22) is connected to the adapter plate and the slider (20) by screws. The workpiece holding mechanism includes a positioner body (25), a support bracket body (11), a support bracket buffer block (9), and a single-acting chuck (32). The positioner body (25) is provided with a semi-circular flip gear device (24), and the semi-circular flip gear device (24) is provided with a positioner turntable (23). The support bracket body (11) is installed on the support bracket linear guide rail (8), and the support bracket body (11) is provided with a drag wheel frame (10).

4. The automated PTA overlay welding method for the wear-resistant layer of the reamer drill bit according to claim 3, characterized in that: The vertical lifting stroke of the lifting column (15) is 1500mm, and the lifting speed is 20mm / min-2000mm / min; the telescopic crossbeam (16) has a telescopic stroke of 1000mm and a horizontal moving speed of 20mm / min-2000mm / min; the moving stroke of the movable base (12) is ≥1500mm.

5. The automated PTA overlay welding method for the wear-resistant layer of the reamer drill bit according to claim 3, characterized in that: The rotation speed of the positioner turntable (23) is 0.01rpm-1rpm, the rotation accuracy is ≤0.12°, and the load is ≤1000kg; the workpiece diameter range of the drag wheel (28) is 80mm-300mm; the swing accuracy of the slider (20) is ±0.1mm, and the swing speed is 40mm / min-4000mm / min.

6. The automated PTA overlay welding method for the wear-resistant layer of a hole reamer drill bit according to claim 3, characterized in that: The integrated base (4) adopts an integrated steel structure. Several leveling feet (5) are installed around the integrated base (4), and buffer blocks (7) are installed on the edge of the integrated base (4).

7. The automated PTA overlay welding method for the wear-resistant layer of a hole reamer drill bit according to claim 3, characterized in that: The movable base (12) is equipped with a limit valve (13).

8. The automated PTA overlay welding method for the wear-resistant layer of a hole reamer drill bit according to claim 3, characterized in that: The tow wheel frame (10) is provided with a tow wheel (28), and the tow wheel frame (10) and the tow wheel (28) are connected by bearings. The edge of the tow wheel frame (10) is provided with a tow wheel lifting device (27).

9. The automated PTA overlay welding method for the wear-resistant layer of a hole reamer drill bit according to claim 8, characterized in that: The tugboat lifting device (27) is provided with a lifting scale (26) on its side.

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