Assembling and welding method for key plates in drill rod

Abstract

The invention provides a drill rod inner key plate assembling and welding method, assembling and welding are conducted on a steel pipe, a meter pipe, a plurality of inner key plates and an outer key plate through assembling equipment and welding equipment to form a drill rod, the assembling and welding method comprises the steps that S1, the steel pipe and the meter pipe are prepared, and the length of the steel pipe is larger than that of the meter pipe; s2, the inner key board is placed in a tool clamp of the assembly equipment, the meter tube is placed on a roller frame of the assembly equipment, and the tool clamp is controlled to enable the kidney-shaped holes of the inner key board and the meter tube to be paired and subjected to spot welding; s3, the rice tube with the inner key board is placed in the welding equipment to be subjected to full-length welding; s4, the rice pipe in the S3 and the steel pipe are installed and welded to form a drill rod; and S5, outer key plate welding is conducted on the drill rod. According to the assembly welding method for the inner key plate of the drill rod, the problems of low assembly welding precision and low working efficiency of the inner key plate in the prior art can be solved, the welding station is shortened, and the welding quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to a method for welding a key plate inside a drill pipe. Background Art

[0002] The existing method for welding the inner key plate of a drill pipe is as follows: (1) preparing at least one steel pipe, such as grinding the steel pipe and manually cutting the waist-shaped hole required for welding the inner key plate; (2) when the required length of the drill pipe is long, combining and welding at least two steel pipes to form the drill pipe; (3) welding the inner key plate of the drill pipe; (4) welding the outer key plate of the drill pipe; (5) straightening the drill pipe. When welding the existing drill pipe, at least two steel pipes are first welded to form the drill pipe, and then the inner key plate is welded to the drill pipe. Therefore, due to the excessive length of the drill pipe, the welding equipment needs to set up a longer welding station to adapt to the length of the drill pipe. Secondly, when welding the inner key plate, it is necessary to ensure that the inner key plate is evenly distributed in the drill pipe, usually three inner key plates are evenly distributed. Before welding the inner key plate of a drill pipe that is too long, the inner key plate needs to be manually hoisted to the waist-shaped hole of the drill pipe. The spot welding operation is difficult and the work efficiency is low. There are also safety hazards and the welding quality cannot be guaranteed. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method for welding the inner key plate of a drill pipe, which can solve the problems of low welding precision and low work efficiency of the inner key plate in the prior art, shorten the welding station, and improve the welding quality.

[0004] The present invention provides a method for welding an inner key plate of a drill pipe. The method comprises the following steps: S1: preparing the steel pipe and the meter pipe, wherein the length of the steel pipe is greater than that of the meter pipe; S2: placing the inner key plate in a fixture of the assembly equipment, placing the meter pipe on a roller frame of the assembly equipment, controlling the fixture to mate the inner key plate with a waist-shaped hole of the meter pipe, and spot welding the inner key plate; S3: placing the meter pipe with the inner key plate in the welding equipment for full welding; S4: welding the meter pipe in S3 to the steel pipe to form a drill pipe; and S5: welding the outer key plate of the drill pipe.

[0005] In one embodiment, the tooling fixture includes a first driving mechanism, a guide rod mechanism and at least three first clamping mechanisms, each of the first clamping mechanisms is arranged at equal intervals in the circumferential direction of the core rod of the first driving mechanism, one end of the guide rod mechanism is hinged to the core rod of the first driving mechanism, and the other end of the guide rod mechanism is connected to the first clamping mechanism, and the first clamping mechanism is used to clamp the inner key plate; when the inner key plate is paired with the rice tube, the first clamping mechanism is arranged in the rice tube to control the rotation of the core rod of the first driving mechanism, and the guide rod mechanism can drive each of the first clamping mechanisms to expand along the radial direction of the rice tube, so that the inner key plate is paired with the waist-shaped hole of the rice tube.

[0006] In one embodiment, the first clamping mechanism includes a positioning rod and a first clamping assembly, the positioning rod is arranged along the axial direction of the core rod, the first clamping assembly is connected to the positioning rod, and the first clamping assembly is used to clamp the inner key plate.

[0007] In one embodiment, the tooling fixture further includes a connecting seat and a buffer device, the connecting seat is arranged along the axial direction of the core rod, and each of the positioning rods is circumferentially arranged around the axial direction of the connecting seat, the core rod is arranged in the connecting seat, the buffer device is arranged in the connecting seat, the buffer device is connected to the core rod, and the guide rod mechanism is hinged to the buffer device.

[0008] In one embodiment, the buffer device includes a first buffer block, a second buffer block and an elastic member, the first buffer block and the second buffer block are arranged in sequence along the screwing direction of the core rod, the elastic member is connected between the first buffer block and the second buffer block, and the guide rod mechanism is hinged to the second buffer block.

[0009] In one embodiment, the guide rod mechanism is provided with at least three groups, each group of the guide rod mechanism includes at least three guide rods, each guide rod is respectively connected between each core rod and each positioning rod, and the buffer device is provided in a one-to-one correspondence with the guide rod.

[0010] In one embodiment, the first clamping assembly includes a first positioning plate and a second positioning plate, the first positioning plate is fixedly connected to the positioning rod, the second positioning plate is slidably connected to the positioning rod, and a positioning groove is formed between the first positioning plate and the second positioning plate, and the positioning groove is used to clamp the inner key plate.

[0011] In one embodiment, the first clamping assembly further includes a second driving mechanism, a threaded rod and a clamping assembly, the threaded rod is connected to the driving end of the second driving mechanism, the threaded rod and the positioning rod are arranged perpendicular to each other, and the clamping assembly is threadedly connected to the threaded rod. When the second driving mechanism drives the threaded rod to rotate, the clamping assembly moves toward the direction close to the positioning rod to fix the inner key plate.

[0012] In one embodiment, the tooling fixture further includes a first fixed seat and at least three first guide rails, each of the first guide rails is fixedly connected to the first fixed seat, each of the first guide rails and each of the positioning rods are arranged perpendicular to each other, and each of the positioning rods is slidably connected to each of the first guide rails.

[0013] In one embodiment, the fitting gap between the inner key plate and the inner wall of the meter tube is less than or equal to 0.5 mm; and the angular deviation between two adjacent inner key plates is less than or equal to 0.25°.

[0014] The drill rod inner key plate assembly welding method of the present invention replaces the method of first splicing steel pipes to form drill rods and then welding the inner key plates to the drill rods by first welding the inner key plates to the meter pipes and then welding the meter pipes and the steel pipes to form the drill rods. Since the length of the meter pipe is much smaller than the length of the drill rods, welding the inner key plates to the meter pipes first can reduce the length of the welding station, and has high precision during the assembly welding process, thereby improving the efficiency of pairing and welding. The automation of pairing and welding of drill rods can be achieved through assembly equipment and welding equipment, thereby reducing the labor intensity of workers and improving the safety of workers during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a structural schematic diagram of the steel pipe of the present invention.

[0017] Figure 2 It is the structural representation of the rice pipe of the present invention.

[0018] Figure 3 It is a side structural schematic diagram of the drill rod of the present invention.

[0019] Figure 4 It is a side structural schematic diagram of the pairing device of the present invention.

[0020] Figure 5It is a schematic diagram of the top view of the assembly device of the present invention.

[0021] Figure 6 It is a schematic diagram of the top structure of the welding equipment of the present invention.

[0022] Figure 7 It is a schematic structural diagram of the tooling fixture of the present invention when it is unfolded.

[0023] Figure 8 It is a side structural schematic diagram of the tooling fixture of the present invention when it is unfolded.

[0024] Figure 9 It is a structural schematic diagram of the buffer device of the fixture of the present invention.

[0025] Figure 10 yes Figure 9 Schematic diagram of the cross-sectional structure at AA in the middle. DETAILED DESCRIPTION

[0026] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, and not all, of the embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the description of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0027] In the description of the present invention, unless otherwise specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms based on the specific circumstances.

[0028] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0029] The terms "first," "second," "third," etc. are merely used to distinguish between elements of similar nature and do not indicate or imply relative importance or a particular order.

[0030] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0031] like Figures 4 to 6 As shown, the steel pipe 31, the meter pipe 32, a plurality of inner key plates 331 and an outer key plate 332 are welded together to form a drill pipe 33 using the assembly equipment 10 and the welding equipment 20. The drill pipe inner key plate welding method includes: S1: Prepare the steel pipe 31 and the rice pipe 32, the length of the steel pipe 31 being greater than the length of the rice pipe 32; Shot blast and cut the steel pipe 31 and the rice pipe 32 so that the lengths of the steel pipe 31 and the rice pipe 32 form the length required for the drill rod 33 after welding; Use a steel pipe cutting device to cut a plurality of waist-shaped holes 301 on the rice pipe 32, each waist-shaped hole 301 is arranged along the length direction of the rice pipe 32, and the waist-shaped holes 301 are distributed in three equal parts in the circumferential direction of the rice pipe 32. By using the steel pipe cutting device to vertically cut the rice pipe 32 and cut the waist-shaped holes 301, the process of manually marking can be reduced, thereby improving the blanking quality of the waist-shaped holes 301; The rice pipe 32 in this embodiment is made of the same material as the steel pipe 31. Because the length of the rice pipe 32 is short, it is called the rice pipe 32, and the purpose of the rice pipe 32 being provided is to weld the inner key plate 331.

[0032] S2: Place the inner key plate 331 in the fixture 13 of the assembling device 10, place the rice tube 32 on the roller frame 14 of the assembling device 10, control the fixture 13 to mate the inner key plate 331 with the waist-shaped hole 301 of the rice tube 32 and spot weld them; the assembling device 10 also includes a first ground rail assembly 11 and a first displacement mechanism 12, the first displacement mechanism 12 is movably connected to the first ground rail assembly 11, the roller frame 14 is connected to one end of the first ground rail assembly 11 away from the first displacement mechanism 12, and the fixture 13 is movably connected to the first displacement mechanism 12. Specifically, the first displacement mechanism 12 includes a first mounting seat 121, a third driving mechanism and a fourth driving mechanism. The first mounting seat 121 is movably connected to the first ground rail assembly 11, the third driving mechanism is fixedly connected to the first ground rail assembly 11, the driving end of the third driving mechanism is connected to the first mounting seat 121, and the third driving mechanism can drive the first mounting seat 121 to move along the length direction of the first ground rail assembly 11. The fourth driving mechanism is connected to the first mounting seat 121, and the driving end of the fourth driving mechanism is connected to the tooling fixture 13. The fourth driving mechanism can drive the tooling fixture 13 to move in a direction perpendicular to the length of the first ground rail assembly 11, that is, the tooling assembly can move in the vertical direction of the first mounting seat 121; the roller frame 14 includes a first fixed frame 141 and a first movable frame 142. The first fixed frame 141 is fixedly connected to the end of the first ground rail assembly 11, and the first movable frame 142 is movable The first movable frame 142 is movably connected to the first ground rail assembly 11, and the first movable frame 142 is arranged between the first shifting mechanism 12 and the first fixed frame 141. The first movable frame 142 can move along the length direction of the first ground rail assembly 11. The first movable frame 142 is provided with a first positioning hole, and the first fixed frame 141 is provided with a second positioning hole. When the meter tube 32 is paired with the inner key plate 331, the meter tube 32 is placed in the first positioning hole and the second positioning hole for positioning. Therefore, the first movable frame 142 is used to match meter tubes 32 of different lengths; the fourth driving mechanism drives the jig 13 to move in the vertical direction so that the height of the jig 13 is adapted to the height of the meter tube 32, and the third driving mechanism drives the first mounting seat 121 to move, so as to drive the jig 13 on the first mounting seat 121 to extend into the meter tube 32 with the inner key plate 331, so that the inner key plate 331 is paired with the waist-shaped hole 301 of the meter tube 32. After the pairing is completed, the inner key plate 331 and the meter tube 32 are spot welded to position the inner key plate 331 .In this embodiment, the third drive mechanism and the fourth drive mechanism are preferably driven by a reciprocating drive mechanism or a drive cylinder. Taking the case where the reciprocating drive mechanism drives the first mounting seat 121 as an example, the reciprocating drive mechanism includes a motor, a screw and a slider. The driving end of the motor is connected to the screw, the slider is threadedly connected to the screw, and the first mounting seat 121 is fixedly connected to the slider. The length direction of the screw is the same as the length direction of the first floor rail assembly 11. When the motor is driven, the slider moves on the screw along the length direction of the screw, thereby driving the first mounting seat 121 to move along the length direction of the first floor rail assembly 11. Taking the case where the first mounting seat 121 is driven by a drive cylinder as an example, the drive cylinder is, for example, a hydraulic cylinder or a pneumatic cylinder. The drive cylinder is arranged along the length direction of the first floor rail assembly 11, and the driving end of the drive cylinder is connected to the first mounting seat 121. The driving end of the drive cylinder drives the first mounting seat 121 to move along the length direction of the first floor rail assembly 11.

[0033] Steps for pairing the inner key plate 331: Step 1: Manually use a KBK (monorail crane) to hoist the meter pipe 32 onto the roller frame 14, and hoist the inner key plate 331 into the fixture 13 for clamping and fixing; Step 2: The pairing device 10 identifies the incoming material specifications based on the incoming material information of the meter pipe 32 and automatically aligns the fixture 13 with the meter pipe 32. The incoming material information is preferably stored in a QR code or barcode; Step 3: Use the operation panel of the pairing device 10 to control the first displacement mechanism 12 to drive the fixture 13 to move along the first ground rail assembly 11 to extend the inner key plate 331 into the meter pipe 32; Step 4: Use the fixture 13 to fit the inner key plate 331 with the meter pipe 32, manually preheat the welding, and manually perform positioning welding on the inner key plate 331 to achieve pairing.

[0034] S3: Place the meter pipe 32 with the inner key plate 331 in the welding equipment 20 for full welding; the welding equipment 20 includes a second ground rail assembly 21, a second shifting mechanism 22, a robot welding device 23 and an internal welding machine 24, the second shifting mechanism 22 is fixedly connected to one end of the second ground rail assembly 21, the second shifting mechanism 22 is used to clamp the meter pipe 32 with the inner key plate 331, the second shifting mechanism 22 can drive the meter pipe 32 to move in the vertical direction, the power source of the second shifting mechanism 22 is preferably a reciprocating linear mechanism or a drive cylinder, the drive cylinder is, for example, a hydraulic cylinder or a pneumatic cylinder; the internal welding machine 24 is connected to the other end of the second ground rail assembly 21, the second shifting mechanism 22 is arranged opposite to the internal welding machine 24, the robot welding device 23 is arranged on one side of the second ground rail assembly 21, and the robot welding device 23 is located between the second displacement mechanism 22 and the internal welding machine 24. The robotic welding device 23 is used to weld the weld between the waist-shaped hole 301 on the outer wall of the meter tube 32 and the inner key plate 331. The robotic welding device 23 has a preheating system, an arc analysis and tracking module and an arc welding software package. The preheating system is used for preheating before welding; the arc analysis and tracking module can automatically compensate for the weld position deviation caused by part warping or inaccurate assembly, and perform position compensation on the longitudinal and transverse robot motion trajectories; the arc welding software package is a software system designed, developed and optimized for arc welding process. In this embodiment, it is mainly used on the robotic welding device 23. The core function of the arc welding software package is to accurately control the welding process, manage welding parameters, and realize intelligent functions to improve welding quality, efficiency, stability and ease of use. Internal welding machine 24 is responsible for the straight weld between the waist-shaped hole 301 on the inner wall of the meter pipe 32 and the inner key plate 331, that is, welding along the length of the meter pipe 32. Internal welding machine 24 has a molten pool monitoring function, which can realize the visualization of the molten pool and weld bead. The welding process can clearly display the status of the weld point, welding gun position, weld position, etc. in real time on the display of internal welding machine 24 through the imaging system, facilitating the operation and control of internal seam welding and ensuring welding quality. Internal welding machine 24 can meet the needs of steel pipes 31 with diameters of 159mm to 720mm and lengths of 800mm to 2200mm, and ensure the quality of the weld seam inside the inner key plate. Both assembly equipment 10 and welding equipment 20 are welded together using high-quality profiles and steel and undergo post-weld stress relief treatment. Therefore, assembly equipment 10 and welding equipment 20 have good rigidity, safety, reliability, and strong load-bearing capacity.

[0035] The steps of welding the inner key plate 331 are as follows: the first step is to hoist the assembled rice pipe 32 to the welding station of the second positioner 22 for automatic clamping; the second step is to automatically preheat the welding position of the rice pipe 32 through the robot welding device 23; the third step is to use the robot welding device 23 to automatically weld the waist-shaped hole 301 weld from the outer wall of the rice pipe 32; the fourth step is to use the internal welding machine 24 to weld the straight weld on the inner wall of the rice pipe 32; the fifth step is to manually hoist the welded rice pipe 32 to the cache station.

[0036] It can be understood that in S2, the positioning welding of the inner key plate 331 is spot welding, and in S3, the inner key plate 331 and the meter pipe 32 are welded by the robot welding device 23 and the inner welding machine 24 as full welding.

[0037] S4: The meter pipe 32 and the steel pipe 31 of S3 are welded together to form a drill pipe 33; welding refers to combined welding, that is, the meter pipe 32 and the steel pipe 31 are spliced ​​and then welded to form an integrated structure.

[0038] S4.1: Straighten the drill pipe 33. Because welding deformation may occur after the meter pipe 32 and the steel pipe 31 are welded together, before welding the outer key plate 332 of the drill pipe 33, it is necessary to first use a straightening platform to test the drill pipe 33 for bending, and then use artificial flame straightening.

[0039] S5: Weld the outer key plate 332 to the drill rod 33. Before welding the outer key plate 332, the drill rod 33 needs to be scribed. Then, the outer key plates 332 and the drill rod 33 are paired. That is, one drill rod 33 corresponds to three outer key plates 332. If the second drill rod 33 is inserted into the first drill rod 33, the inner key plate 331 of the first drill rod 33 is matched with the outer key plate 332 of the second drill rod 33. The outer key plates 332 and the drill rod 33 are manually spot-welded and positioned. Then, the outer key plates 332 and the drill rod 33 are fully welded using the robotic welding equipment 20.

[0040] S5.1: After the outer key plate 332 and the drill rod 33 are fully welded by the robot, the weld defects are repaired manually.

[0041] S6: Straightening the drill rod 33. Since welding deformation may occur after the outer key plate 332 and the drill rod 33 are welded, it is necessary to straighten the drill rod 33 using an artificial flame.

[0042] like Figure 7 and Figure 8 As shown, the fixture 13 further includes a first fixing seat 131 , and the first fixing seat 131 is fixedly connected to the driving end of the fourth driving mechanism of the first displacement mechanism 12 .

[0043] Preferably, the fixture 13 includes a first driving mechanism 132, a guide rod mechanism and at least three first clamping mechanisms 134. The first clamping mechanisms 134 are arranged at equal intervals in the circumferential direction of the core rod 1321 of the first driving mechanism 132. One end of the guide rod mechanism is hinged to the core rod 1321 of the first driving mechanism 132, and the other end of the guide rod mechanism is connected to the first clamping mechanism 134. The first clamping mechanism 134 is used to clamp the inner key plate 331. Therefore, the fixture 13 can be When the inner key plates 331 are paired with the rice tube 32, the fourth driving mechanism drives the jig 13 to move toward the rice tube 32, causing the first clamping mechanism 134 to be disposed within the rice tube 32. The core rod 1321 of the first driving mechanism 132 is controlled to rotate inward. The guide rod mechanism can drive each first clamping mechanism 134 to expand along the radial direction of the rice tube 32, so that the inner key plates 331 are paired with the waist-shaped holes 301 of the rice tube 32. Specifically, the first driving mechanism 132 preferably drives the core rod 1321 to rotate inward via a motor.

[0044] Preferably, the first clamping mechanism 134 includes a positioning rod 1341 and a first clamping assembly 1342. The positioning rod 1341 is arranged along the axis of the core rod 1321. The first clamping assembly 1342 is connected to the positioning rod 1341 and is used to clamp the inner key plate 331. The positioning rod 1341 is preferably a guide rail or a slide rod.

[0045] Preferably, the tooling fixture 13 also includes a connecting seat 135 and a buffer device 136. The connecting seat 135 is a columnar hollow structure. The connecting seat 135 is arranged along the axial direction of the core rod 1321. There are three positioning rods 1341. Each positioning rod 1341 is circumferentially arranged around the axial direction of the connecting seat 135. An angle of 120 degrees is formed between two adjacent positioning rods 1341. Therefore, the three positioning rods 1341 are distributed in three equal parts around the axial direction of the connecting seat 135. The core rod 1321 is arranged in the connecting seat 135. The buffer device 136 is arranged in the connecting seat 135. The buffer device 136 is connected to the core rod 1321, and the guide rod mechanism is hinged to the buffer device 136. In this embodiment, the buffer device 136 is fixedly connected to the core rod 1321 by means of a bolt connection, and when the core rod 1321 moves, the buffer device 136 moves together with the core rod 1321; the guide rod mechanism can be rotatably connected to the buffer device 136 through the first rotating shaft 1365, and when the core rod 1321 moves, the guide rod mechanism can rotate around the first rotating shaft 1365 to unfold the first clamping mechanism 134.

[0046] like Figure 9 and Figure 10The buffer device 136 includes a first buffer block 1361, a second buffer block 1362, and an elastic member 1363. The first and second buffer blocks 1361, 1362 are arranged sequentially along the screwing direction of the core rod 1321. The elastic member 1363 is connected between the first and second buffer blocks 1361, 1362, and the guide rod mechanism is hinged to the second buffer block 1362. In this embodiment, a positioning post 1364 is connected between the first and second buffer blocks 1361, 1362. The positioning post 1364 is disposed within the elastic member 1363 and provides guidance for the elastic member 1363. The elastic member 1363 is preferably a spring. A first rotating shaft 1365 is connected to the end of the second buffer block 1362 away from the first buffer block 1361.

[0047] Preferably, there are at least three groups of guide rod mechanisms, and the three groups of guide rod mechanisms are arranged at intervals along the length direction of the connecting seat 135. The guide rod mechanisms are preferably three groups, four groups or five groups, etc. Each group of guide rod mechanisms includes at least three guide rods 1331, and each guide rod 1331 is respectively connected between each core rod 1321 and each positioning rod 1341. The buffer device 136 and the guide rod 1331 are arranged in a one-to-one correspondence. Therefore, one end of the guide rod 1331 is connected to the second buffer block 1362 of the buffer device 136 through the first rotating shaft 1365, and the other end of the guide rod 1331 is connected to the positioning rod 1341 through the second rotating shaft 1343.

[0048] like Figure 7 As shown, the first clamping assembly 1342 includes a first positioning plate 13421 and a second positioning plate 13422. The first positioning plate 13421 is fixedly connected to the positioning rod 1341, and the second positioning plate 13422 is slidably connected to the positioning rod 1341, that is, the second positioning plate 13422 can move toward or away from the first positioning plate 13421. The second positioning plate 13422 is moved manually, and a positioning groove is formed between the first positioning plate 13421 and the second positioning plate 13422. The positioning groove is used to clamp the inner key plate 331. Adjusting the distance between the first positioning plate 13421 and the second positioning plate 13422 can make the positioning groove match the inner key plates 331 of different lengths.

[0049] like Figure 7 and Figure 8As shown, the first clamping assembly 1342 also includes a second driving mechanism, a threaded rod 137 and a clamping assembly 138, the threaded rod 137 is connected to the driving end of the second driving mechanism, the threaded rod 137 and the positioning rod 1341 are arranged perpendicular to each other, and the clamping assembly 138 is threadedly connected to the threaded rod 137. When the second driving mechanism drives the threaded rod 137 to rotate, the clamping assembly 138 moves in a direction close to the positioning rod 1341 to fix the inner key plate 331. After the inner key plate 331 is positioned by the first positioning plate 13421 and the second positioning plate 13422, it is also necessary to clamp the inner key plate 331 by the clamping assembly 138 to prevent the inner key plate 331 from falling off during the pairing process with the meter tube 32. The clamping assembly 138 also includes a clamping plate 1381, and a clamping groove is provided at one end of the clamping plate 1381 near the positioning rod 1341, and the shape of the clamping groove corresponds to the shape of the inner key plate 331.

[0050] Preferably, the fixture 13 also includes at least three first guide rails, each of which is fixedly connected to the first fixed base 131. Each first guide rail is perpendicular to a positioning rod 1341, and each positioning rod 1341 is slidably connected to the first guide rail. When the core rod 1321 moves, the guide rod 1331 rotates about the first rotation axis 1365 of the buffer device 136 to deploy the positioning rod 1341. Since the positioning rod 1341 is slidably connected to the first guide rail, it can move along the length of the first guide rail.

[0051] Preferably, under the action of the buffer device 136, when the inner key plate 331 is fitted with the rice tube 32, the elliptical state of the rice tube 32 can be ensured, so that the fitting gap between the inner key plate 331 and the inner wall of the rice tube 32 is less than or equal to 0.5 mm, preferably 0.5 mm, 0.4 mm or 0.3 mm, etc.; the angular deviation between two adjacent inner key plates 331 is less than or equal to 0.25°, preferably 0.25°, 0.2° or 0.1°, etc.

[0052] By using the assembly equipment 10 and the welding equipment 20 of the present invention, the assembly welding of the drill rod 33 can be completed by one person, which reduces labor costs and worker intensity, improves the level of workshop automation and production efficiency, and also improves the safety of the welding process.

[0053] When the drill rod inner key plate assembly welding method of the present invention is used to assemble the drill rod, the existing technology of first splicing the steel pipe 31 to form the drill rod 33 and then welding the inner key plate 331 to the drill rod 33 is replaced by first welding the inner key plate 331 to the meter pipe 32 and then welding the meter pipe 32 to the steel pipe 31 to form the drill rod 33. Since the length of the meter pipe 32 is much smaller than the length of the drill rod 33, welding the inner key plate 331 to the meter pipe 32 first can reduce the length of the welding station, and the precision is high during the assembly welding process, the welding is simpler, and the efficiency of pairing and welding is improved. The pairing and welding of the drill rod 33 can be automated through the assembly equipment 10 and the welding equipment 20, which reduces the labor intensity of workers and improves the safety of workers during welding.

[0054] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this invention are intended to be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for welding a key plate inside a drill pipe, characterized in that: A steel pipe (31), a meter pipe (32), a plurality of inner key plates (331) and an outer key plate (332) are welded together to form a drill pipe (33) using an assembly device (10) and a welding device (20). The welding method includes: S1: preparing the steel pipe (31) and the meter pipe (32), wherein the length of the steel pipe (31) is greater than the length of the meter pipe (32); S2: placing the inner key plate (331) in the fixture (13) of the pairing device (10), placing the meter tube (32) on the roller frame (14) of the pairing device (10), and controlling the fixture (13) to mate the inner key plate (331) with the waist-shaped hole (301) of the meter tube (32) and spot weld them; S3: placing the meter pipe (32) with the inner key plate (331) in the welding device (20) for full welding; S4: welding the meter pipe (32) and the steel pipe (31) of S3 to form a drill pipe (33); S5: Welding the outer key plate (332) of the drill rod (33).

2. The method for welding the inner key plate of a drill pipe according to claim 1, characterized in that: The fixture (13) comprises a first driving mechanism (132), a guide rod mechanism and at least three first clamping mechanisms (134), each of the first clamping mechanisms (134) being arranged at equal intervals in the circumferential direction of a core rod (1321) of the first driving mechanism (132), one end of the guide rod mechanism being hinged to the core rod (1321), and the other end of the guide rod mechanism being connected to the first clamping mechanism (134), and the first clamping mechanism (134) being used to clamp the inner key plate (331); When the inner key plate (331) is paired with the meter tube (32), the first clamping mechanism (134) is arranged in the meter tube (32) to control the core rod (1321) of the first driving mechanism (132) to rotate inward, and the guide rod mechanism can drive each of the first clamping mechanisms (134) to expand along the radial direction of the meter tube (32), so that the inner key plate (331) is paired with the waist-shaped hole (301) of the meter tube (32).

3. The inner key plate welding method according to claim 2, characterized in that: The first clamping mechanism (134) includes a positioning rod (1341) and a first clamping assembly (1342), wherein the positioning rod (1341) is arranged along the axial direction of the core rod (1321), and the first clamping assembly (1342) is connected to the positioning rod (1341), and the first clamping assembly (1342) is used to clamp the inner key plate (331).

4. The method for welding the key plate inside the drill pipe according to claim 2, characterized in that: The fixture (13) further includes a connecting seat (135) and a buffer device (136), wherein the connecting seat (135) is arranged along the axial direction of the core rod (1321), and each of the positioning rods (1341) is circumferentially arranged around the axial direction of the connecting seat (135), the core rod (1321) is arranged in the connecting seat (135), the buffer device (136) is arranged in the connecting seat (135), the buffer device (136) is connected to the core rod (1321), and the guide rod mechanism is hinged to the buffer device (136).

5. The method for welding the inner key plate of a drill pipe according to claim 4, characterized in that: The buffer device (136) comprises a first buffer block (1361), a second buffer block (1362) and an elastic member (1363), wherein the first buffer block (1361) and the second buffer block (1362) are arranged in sequence along the screwing direction of the core rod (1321), the elastic member (1363) is connected between the first buffer block (1361) and the second buffer block (1362), and the guide rod mechanism is hinged to the second buffer block (1362).

6. The method for welding the inner key plate of a drill pipe according to claim 3, characterized in that: The guide rod mechanism is provided with at least three groups, and each group of the guide rod mechanism includes at least three guide rods (1331). Each guide rod (1331) is respectively connected between each core rod (1321) and each positioning rod (1341). The buffer device (136) is provided in a one-to-one correspondence with the guide rod (1331).

7. The method for welding the inner key plate of a drill pipe according to claim 3, characterized in that: The first clamping assembly (1342) includes a first positioning plate (13421) and a second positioning plate (13422), wherein the first positioning plate (13421) is fixedly connected to the positioning rod (1341), and the second positioning plate (13422) is slidably connected to the positioning rod (1341), and a positioning groove is formed between the first positioning plate (13421) and the second positioning plate (13422), and the positioning groove is used to clamp the inner key plate (331).

8. The method for welding the inner key plate of a drill pipe according to claim 7, wherein: The first clamping assembly (1342) further includes a second driving mechanism, a threaded rod (137) and a clamping assembly (138), wherein the threaded rod (137) is connected to the driving end of the second driving mechanism, the threaded rod (137) and the positioning rod (1341) are arranged perpendicular to each other, and the clamping assembly (138) is threadedly connected to the threaded rod (137). When the second driving mechanism drives the threaded rod (137) to rotate, the clamping assembly (138) moves toward the direction close to the positioning rod (1341) to fix the inner key plate (331).

9. The method for welding the inner key plate of a drill pipe according to claim 3, characterized in that: The fixture (13) further comprises a first fixed seat (131) and at least three first guide rails, each of the first guide rails being fixedly connected to the first fixed seat (131), each of the first guide rails and each of the positioning rods (1341) being arranged perpendicular to each other, and each of the positioning rods (1341) being slidably connected to each of the first guide rails.

10. The method for welding the inner key plate of a drill pipe according to any one of claims 1 to 9, characterized in that: The fitting gap between the inner key plate (331) and the inner wall of the meter tube (32) is less than or equal to 0.5 mm; and the angular deviation between two adjacent inner key plates (331) is less than or equal to 0.25°.

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