Automatic welding machine for pile splicing in PHC pipeline

Abstract

The invention provides an automatic welding machine for pile splicing in a PHC pipeline. The automatic welding machine comprises an opening and closing fixing mechanism, a rotating mechanism arranged at the bottom of the fixing mechanism, a rotating second-stage telescopic mechanism arranged at the bottom of the rotating mechanism, a welding gun arranged at one end of the second-stage telescopic mechanism, a pressing device arranged on the welding gun, and a first-stage wire control device arranged on the rotating mechanism. The PHC pipe abuts against the interior of the PHC pipe to move. The whole structure can be used for in-pipe welding in a narrow space, and welding quality and safety are not affected. Workers are prevented from curling up inside for welding, inconvenience in operation is avoided, the welding time and the labor intensity of the workers are reduced, and the working efficiency is improved. And meanwhile, in the PHC splicing pile inner diameter welding process, welding wires and air pipes can be conveyed, welding equipment faults cannot be caused, and safety accidents are avoided.

Description

Technical Field

[0001] The invention relates to the field of pipeline welding, and in particular to an automatic welding machine used for connecting piles inside a PHC pipeline. Background Art

[0002] The current PHC pile connection mainly relies on manual welding. The pipe diameter is generally 1000-1400. The inner diameter of the PHC pile is small, and the inner diameter is generally 760-1100. The outer diameter can be welded manually on the outside. However, the inner diameter welding is difficult now. The inner diameter can only be welded by lifting equipment to lift the workers in. The small inner diameter makes it difficult to operate welding tools and equipment, and the weld position is not easy to reach. The narrow space may cause poor ventilation during welding, affecting the quality and safety of welding. If the inner diameter is too small, the workers will curl up inside to weld, which is inconvenient to operate, increasing the welding time and the labor intensity of the workers, and reducing work efficiency. At the same time, during the inner diameter welding of the PHC pile connection, it is difficult for manual or equipment to transport the welding wire and the air pipe, which can easily lead to welding equipment failure and increase safety risks. Summary of the invention

[0003] The present invention provides an automatic welding machine for internal connection piles of PHC pipes, which solves the problem that when welding the inner diameter of PHC connection piles, a lifting device is used to lift workers in for welding, welding tools and equipment are difficult to operate, welding time and workers' labor intensity are increased, work efficiency is reduced, and welding quality and safety are affected.

[0004] The present invention solves another problem: it solves the problem that the inner diameter of the PHC connecting pile makes it difficult to transport the welding wire and the air pipe manually or by equipment, which easily leads to welding equipment failure and increases safety risks.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: an automatic welding machine for connecting piles inside a PHC pipeline, comprising an opening and closing fixing mechanism, a rotating mechanism is provided at the bottom of the fixing mechanism, a rotating secondary telescopic mechanism is provided at the bottom of the rotating mechanism, a welding gun is provided at one end of the secondary telescopic mechanism, a pressing device is provided on the welding gun, and a primary wire control device is provided on the rotating mechanism; The PHC tube moves against the inside of the PHC tube.

[0006] In a preferred solution, the fixing mechanism includes a ring platform, a plurality of opening and closing devices are provided at the bottom of the ring platform, the opening and closing devices include a plurality of hinged diagonal braces, a friction block is provided at one end of the diagonal brace, and a plurality of friction strips are provided on the friction block; The friction block rests against the inner wall of the PHC tube.

[0007] In a preferred solution, a first motor is provided on the top of the ring platform, a screw rod is provided at the output end of the first motor, and the opening and closing device comprises a ring body, a screw rod sleeve is provided on the ring body, and the screw rod sleeve is connected to the screw rod.

[0008] In the preferred solution, the diagonal brace includes two diagonal rods in an outward-facing O-shaped structure, the diagonal brace is hinged to the ring platform through a hinged rod, each opening and closing device has a different rotation angle relative to the ring body, and the ring platform is connected to the winch through a steel cable.

[0009] In a preferred embodiment, the rotating mechanism includes a fixed platform, a second motor is provided on the fixed platform, a gear is provided at the output end of the second motor, a meshing gear ring is provided on the gear, a rotating column is provided at the bottom of the gear ring, the rotating column is rotatably connected to the fixed platform, and the fixed platform is connected to the fixing mechanism through multiple connecting rods.

[0010] In a preferred solution, a round platform is provided at the bottom of the rotating column, a through groove is provided on the rotating column, a secondary telescopic mechanism is provided on the round platform, and a first sliding groove is provided on the round platform.

[0011] In a preferred solution, the secondary telescopic mechanism includes a first rigid chain transmission device, a second rigid chain transmission device and a slide plate, the slide plate is provided with a second slide groove, one end of the slide plate slides against the first slide groove, the first rigid chain transmission device includes a rotating drum and a connecting plate installed on the rotating mechanism, and the connecting plate is connected to the rotating drum through a rigid chain; The second rigid chain transmission device is connected end to end with the first rigid chain transmission device. The second rigid chain transmission device has the same structure as the first rigid chain transmission device. A connecting plate is provided at the bottom of the second rigid chain transmission device, and the connecting plate slides against the second slide groove. An arc-shaped baffle is provided at the bottom of the first rigid chain transmission device.

[0012] In a preferred solution, a first adjusting push rod and a second adjusting push rod are provided between the secondary telescopic mechanism and the welding gun, one end of the first adjusting push rod and the second adjusting push rod are both hinged to the welding gun, and a camera is provided on one side of the secondary telescopic mechanism; A wire supply box is arranged on the top of the fixing mechanism, a wire supply motor is arranged on one side of the wire supply box, and one end of the welding wire output by the wire supply box is installed on one side of the welding gun.

[0013] In the preferred solution, a tensioning mechanism is provided on one side of the welding gun, the tensioning mechanism includes a tensioning seat installed on the secondary telescopic mechanism, a tensioning motor is provided on the tensioning seat, a tension rod is provided on the tensioning motor, one end of the tension rod is connected to the tensioning motor, the other end of the tension rod is connected to the tension wheel, and limit switches are provided at both ends of the tension rod; The limit switch comprises a trigger column and a receiver. The trigger column is installed at one end of the tension rod close to the tension motor, and the receiver is installed on the tension motor.

[0014] In a preferred solution, a pressing device is provided on one side of the welding gun, the pressing device comprises a bracket, a pressing wheel and a follower pressing wheel are provided on the bracket, the welding wire abuts between the pressing wheel and the follower pressing wheel, a pressing motor is provided at one end of the pressing wheel, an air pipe groove is provided on the bracket, and the air pipe abuts against the air pipe groove; An air guide wheel and a first-stage wire control device are provided on the rotating mechanism, and the air pipe is wound around the air guide wheel; The primary wire control device comprises a winding sleeve, one end of which is provided with a wire control motor, and the welding wire is wound on the winding sleeve.

[0015] The beneficial effects of the present invention are as follows: when welding inside the PHC pipeline, the fixing mechanism is lowered by a winch, and after being lowered for a certain distance, the first motor is driven, multiple opening and closing devices are opened, and multiple friction blocks are pressed against the inner wall of the PHC pipe. When the overall device slides down to the docking position of the two PHC pipes, the overall device stops moving under the friction force of the friction blocks, and the vertical height position of the welding gun is initially positioned. By driving the first adjustment push rod and the second adjustment push rod, the vertical height position of the welding gun is accurately positioned by camera observation. By driving the second adjustment push rod, the inclination angle of the welding gun and the PHC pipe groove can be adjusted. The wall of the PHC pipe is relatively thick, and the inclination angle of the welding gun can be adjusted by the second adjustment push rod, so that the overall structure can perform multiple passes of welding on the PHC pipe to adapt to the welding of thicker PHC pipes.

[0016] The first rigid chain transmission device in the secondary telescopic mechanism is driven to make the slide plate slide and adjust the radial horizontal position of the welding gun. When the overall device is transferred from the PHC tube with a smaller inner diameter to the PHC tube with a larger inner diameter, the second rigid chain transmission device in the secondary telescopic mechanism can be driven to make the connecting plate slide relative to the slide plate to increase the radial horizontal displacement distance of the secondary telescopic mechanism, so that the overall structure can adapt to PHC tubes with different diameters, and the camera can accurately control the radial horizontal position of the welding gun.

[0017] The fixing mechanism is opened and closed by a plurality of opening and closing devices to realize the vertical positioning of the whole structure, with a simple structure and convenient operation. The diagonal brace includes two diagonal rods in an outer eight structure, which are hinged to the ring platform through a hinged rod, thereby increasing the supporting force of the diagonal brace. At the same time, the diagonal rods in an outer eight structure prevent the fixing mechanism from rotating along the inner wall of the PHC tube after installation. The structure is stable and provides a good welding environment. The rotation angle of each opening and closing device relative to the ring body is different, so that the plurality of friction blocks are located at different axial positions on the inner wall of the PHC tube, further limiting the rotation of the fixing mechanism along the inner wall of the PHC tube, thereby providing a good welding environment.

[0018] The rotating mechanism is driven to rotate the rotating column so that the welding gun can rotate along the welding point of the PHC tube. The ring body in the opening and closing device is connected to the screw sleeve through multiple connecting rods. The space around the connecting rod can provide space for the welding wire and the air pipe, which is convenient for the overall device to transport the welding wire and the air pipe, avoiding malfunction of the welding equipment when transporting the welding wire and the air pipe, and increasing the safety risk.

[0019] Both the primary wire control device and the clamping device can actively control the wire feeding process. During welding, the clamping device is driven to actively feed the wire during welding. The wire can be straightened by the clamping device, which is convenient for later welding. A tensioning mechanism is added between the primary wire control device and the clamping device to increase the reserved wire space for the primary wire control device and the clamping device. When adjusting the vertical or horizontal position of the welding gun, the wire is prevented from breaking or equipment damage. The tensioning motor of the tensioning mechanism adopts a constant torque output control mode. By adjusting the output torque on the tensioning motor, the tension applied by the tension wheel on the wire can be accurately adjusted to maintain the stability of the wire during welding. When the tension rod moves too much, the tension rod abuts against one end of the limit switch, and the tensioning motor stops the tension rod from swinging, preventing the tension rod from moving beyond the design range and causing an accident. It has great promotion value.

[0020] The overall structure can be used for internal welding in a small space without affecting welding quality and safety. It avoids workers crouching inside for welding, avoids inconvenience in operation, reduces welding time and labor intensity, and improves work efficiency. At the same time, during the PHC pile inner diameter welding process, the welding wire and gas pipe can be transported without causing welding equipment failure, thus avoiding safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments; Figure 1 It is a front view of the overall structure of the present invention; Figure 2 is a front view of the fixing mechanism of the present invention; Figure 3 is a top view of the opening and closing device of the present invention; Figure 4 The present invention Figure 1 A magnified view of A; Figure 5 is a schematic diagram of the rotating mechanism of the present invention; Figure 6 is a cross-sectional view of the secondary telescopic mechanism of the present invention; Figure 7 It is a cross-sectional view of a local structure of the present invention; Figure 8 is a side view of the tensioning mechanism of the present invention; Fig. 9 It is a front view of the local structure of the present invention; Fig.10 It is a side view of the primary wire control device of the present invention; Fig.11 is a cross-sectional view of the compacting device of the present invention; In the figure: PHC tube 1; fixing mechanism 2; ring platform 201; opening and closing device 202; ring body 2021; screw rod sleeve 2022; diagonal support 2023; friction block 2024; friction strip 2025; hinged rod 203; screw rod 204; first motor 205; rotating mechanism 3; fixing platform 301; gear ring 302; second motor 303; gear 304; connecting rod 305; rotating column 306; through groove 3061; round platform 307; first sliding groove 3071; secondary telescopic mechanism 4; first rigid chain transmission device 401; connecting plate 4011; rigid chain 4012; rotating drum 4013; second rigid chain transmission The invention comprises the following steps: a driving device 402; a slide plate 403; a second slide groove 4031; a connecting plate 404; an arc-shaped baffle plate 405; a wire feeding box 5; a wire feeding motor 501; a steel cable 6; a tensioning mechanism 7; a tensioning seat 701; a tensioning motor 702; a limit switch 703; a tension rod 704; a tension wheel 705; a primary wire control device 8; a winding sleeve 801; a wire control motor 802; a pressing device 9; a bracket 901; a pressing motor 902; a pressing wheel 903; a slave pressing wheel 904; an air pipe groove 905; a first adjusting push rod 10; a second adjusting push rod 11; an air pipe 12; a welding gun 13; a camera 14; a welding wire 15; and an air guide wheel 16. DETAILED DESCRIPTION

[0022] Embodiment 1: like Figure 1-11 An automatic welding machine for connecting piles inside a PHC pipeline includes an opening and closing fixing mechanism 2, a rotating mechanism 3 is provided at the bottom of the fixing mechanism 2, a rotating secondary telescopic mechanism 4 is provided at the bottom of the rotating mechanism 3, a welding gun 13 is provided at one end of the secondary telescopic mechanism 4, a pressing device 9 is provided on the welding gun 13, and a primary wire control device 8 is provided on the rotating mechanism 3; The PHC tube 1 moves against the inside of the PHC tube 1. With this structure, when welding inside the PHC pipeline, the fixing mechanism 2 is lowered by the winch, and after being lowered for a certain distance, the first motor 205 is driven, and the multiple opening and closing devices 202 are opened, and the multiple friction blocks 2024 are against the inner wall of the PHC tube 1. When the whole device slides down to the docking position of the two PHC tubes 1, the whole device stops moving under the friction force of the friction blocks 2024, and the vertical height position of the welding gun 13 is initially positioned. By driving the first adjustment push rod 10 and the second adjustment push rod 11, the camera 14 observes and accurately positions the vertical height position of the welding gun 13. By driving the second adjustment push rod 11, the inclination angle of the welding gun 13 and the groove of the PHC tube 1 can be adjusted. The wall of the PHC tube 1 is relatively thick. The second adjustment push rod 11 is used to adjust the inclination angle of the welding gun 13 so that the overall structure can perform multiple passes of welding on the PHC tube 1 to adapt to the welding of thicker PHC tubes 1.

[0023] The first rigid chain transmission device 401 in the secondary telescopic mechanism 4 is driven to make the slide plate 403 slide and adjust the radial horizontal position of the welding gun 13. When the overall device is transferred from the PHC tube 1 with a smaller inner diameter to the PHC tube 1 with a larger inner diameter, the second rigid chain transmission device 402 in the secondary telescopic mechanism 4 can be driven to make the connecting plate 404 slide relative to the slide plate 403 to increase the radial horizontal displacement distance of the secondary telescopic mechanism 4, so that the overall structure can adapt to PHC tubes 1 with different diameters, and the camera 14 can accurately control the radial horizontal position of the welding gun 13.

[0024] The fixing mechanism 2 is opened and closed by a plurality of opening and closing devices 202 to realize the vertical positioning of the whole structure, and has a simple structure and is easy to operate. The diagonal brace 2023 includes two diagonal rods in an outer eight structure, and the diagonal brace 2023 is hinged to the ring platform 201 through the hinge rod 203, which increases the supporting force of the diagonal brace 2023. At the same time, the diagonal rods in the outer eight structure prevent the fixing mechanism 2 from rotating along the inner wall of the PHC tube 1 after installation, and the structure is stable, providing a good welding environment. The rotation angle of each opening and closing device 202 relative to the ring body 2021 is different, so that the plurality of friction blocks 2024 are located at different axial positions on the inner wall of the PHC tube 1, further limiting the rotation of the fixing mechanism 2 along the inner wall of the PHC tube 1, and providing a good welding environment.

[0025] The rotating mechanism 3 is driven to rotate the rotating column 306 so that the welding gun 13 can rotate along the welding point of the PHC tube 1. The ring body 2021 in the opening and closing device 202 is connected to the screw sleeve 2022 through multiple connecting rods. The space around the connecting rod can provide space for the welding wire 15 and the air pipe 12, which is convenient for the overall device to transport the welding wire 15 and the air pipe 12, avoiding malfunction of the welding equipment when transporting the welding wire 15 and the air pipe 12, and increasing the safety risk.

[0026] The primary wire control device 8 and the pressing device 9 can actively control the conveying process of the welding wire 15. During welding, the pressing device 9 is driven to actively convey the welding wire 15 during welding. The welding wire 15 can be pressed straight by the pressing device 9, which is convenient for later welding. A tensioning mechanism 7 is added between the primary wire control device 8 and the pressing device 9 to increase the reserved welding wire space of the primary wire control device 8 and the pressing device 9. When adjusting the vertical or horizontal position of the welding gun 13, the welding wire 15 is prevented from breaking or equipment damage. The tensioning motor 702 of the tensioning mechanism 7 is a constant torque output control mode. By adjusting the output torque on the tensioning motor 702, the tension applied by the tension wheel 705 to the welding wire 15 can be accurately adjusted to maintain the stability of the welding wire 15 during welding. When the tension rod 704 moves too much, the tension rod 704 abuts against one end of the limit switch 703, and the tensioning motor 702 stops the tension rod 704 from swinging to prevent the tension rod 704 from moving beyond the design range and causing an accident.

[0027] In the preferred solution, the fixing mechanism 2 includes a ring platform 201, a plurality of opening and closing devices 202 are provided at the bottom of the ring platform 201, the opening and closing devices 202 include a plurality of hinged diagonal braces 2023, a friction block 2024 is provided at one end of the diagonal brace 2023, and a plurality of friction strips 2025 are provided on the friction block 2024; The friction block 2024 abuts against the inner wall of the PHC tube 1. With this structure, the friction strip 2025 increases the friction force.

[0028] In a preferred embodiment, a first motor 205 is provided on the top of the ring platform 201, a screw rod 204 is provided at the output end of the first motor 205, and the opening and closing device 202 includes a ring body 2021, a screw rod sleeve 2022 is provided on the ring body 2021, and the screw rod sleeve 2022 is connected to the screw rod 204. With this structure, multiple opening and closing devices 202 are connected to the ring platform 201 through guide rods.

[0029] In the preferred solution, the diagonal brace 2023 includes two diagonal rods in an outer eight structure, the diagonal brace 2023 is hinged to the ring platform 201 through the hinged rod 203, and each opening and closing device 202 has a different rotation angle relative to the ring body 2021. The ring platform 201 is connected to the winch through the steel cable 6. With this structure, the diagonal brace 2023 includes two diagonal rods in an outer eight structure, the diagonal brace 2023 is hinged to the ring platform 201 through the hinged rod 203, which increases the supporting force of the diagonal brace 2023. At the same time, the diagonal rods in the outer eight structure prevent the fixing mechanism 2 from rotating along the inner wall of the PHC tube 1 after installation, and the structure is stable, providing a good welding environment. The rotation angle of each opening and closing device 202 relative to the ring body 2021 is different, so that the multiple friction blocks 2024 are located at different axial positions on the inner wall of the PHC tube 1, further limiting the rotation of the fixing mechanism 2 along the inner wall of the PHC tube 1, providing a good welding environment.

[0030] In a preferred solution, the rotating mechanism 3 includes a fixed platform 301, a second motor 303 is provided on the fixed platform 301, a gear 304 is provided at the output end of the second motor 303, a meshing gear ring 302 is provided on the gear 304, a rotating column 306 is provided at the bottom of the gear ring 302, the rotating column 306 is rotatably connected to the fixed platform 301, and the fixed platform 301 is connected to the fixed mechanism 2 through a plurality of connecting rods 305. With this structure, the second motor 303 is driven to rotate the gear 304, so that the gear ring 302 rotates, so that the rotating column 306 rotates, and so that the welding gun 13 rotates.

[0031] In the preferred embodiment, a round platform 307 is provided at the bottom of the rotating column 306, a through slot 3061 is provided on the rotating column 306, a secondary telescopic mechanism 4 is provided on the round platform 307, and a first slide slot 3071 is provided on the round platform 307. With this structure, the rotating column 306 is a hollow structure, and the interior of the rotating column 306 provides space for the welding wire 15 and the air pipe 12.

[0032] In a preferred solution, the secondary telescopic mechanism 4 includes a first rigid chain transmission device 401, a second rigid chain transmission device 402 and a slide plate 403, the slide plate 403 is provided with a second slide groove 4031, one end of the slide plate 403 slides against the first slide groove 3071, the first rigid chain transmission device 401 includes a rotating drum 4013 and a connecting plate 4011 installed on the rotating mechanism 3, and the connecting plate 4011 is connected to the rotating drum 4013 through a rigid chain 4012; The second rigid chain transmission device 402 is connected end to end with the first rigid chain transmission device 401. The second rigid chain transmission device 402 has the same structure as the first rigid chain transmission device 401. A connecting plate 404 is provided at the bottom of the second rigid chain transmission device 402. The connecting plate 404 slides against the second slide groove 4031. An arc-shaped baffle 405 is provided at the bottom of the first rigid chain transmission device 401. According to this structure, the first rigid chain transmission device 401 in the secondary telescopic mechanism 4 is driven to slide the slide plate 403 to adjust the radial horizontal position of the welding gun 13. When the whole device is transferred from the PHC tube 1 with a smaller inner diameter to the PHC tube 1 with a larger inner diameter, the second rigid chain transmission device 402 in the secondary telescopic mechanism 4 can be driven to slide the connecting plate 404 relative to the slide plate 403 to increase the radial horizontal displacement distance of the secondary telescopic mechanism 4, so that the whole structure can adapt to PHC tubes 1 with different diameters, and the camera 14 can accurately control the radial horizontal position of the welding gun 13.

[0033] The drum 4013 is provided with a drum motor, the output end of the drum motor is provided with a sprocket, the sprocket is connected to the rigid chain 4012, an arc track is provided inside the drum 4013, when the first rigid chain transmission device 401 is retracted, the rigid chain 4012 at the end moves in the arc track.

[0034] In the preferred solution, a first adjusting push rod 10 and a second adjusting push rod 11 are provided between the secondary telescopic mechanism 4 and the welding gun 13, one end of the first adjusting push rod 10 and the second adjusting push rod 11 are both hinged to the welding gun 13, and a camera 14 is provided on one side of the secondary telescopic mechanism 4; A wire supply box 5 is provided on the top of the fixing mechanism 2, and a wire supply motor 501 is provided on one side of the wire supply box 5. One end of the welding wire 15 output by the wire supply box 5 is installed on one side of the welding gun 13. With this structure, the camera 14 observes the welding image, which is mainly used to align the welding position. By driving the first adjusting push rod 10 and the second adjusting push rod 11, the camera 14 observes and accurately positions the vertical height position of the welding gun 13. By driving the second adjusting push rod 11, the inclination angle of the groove of the welding gun 13 and the PHC tube 1 can be adjusted. The wall of the PHC tube 1 is relatively thick. The second adjusting push rod 11 is used to adjust the inclination angle of the welding gun 13 so that the overall structure can perform multiple passes of welding on the PHC tube 1 to adapt to the welding of thicker PHC tubes 1.

[0035] The PHC pipe 1 is welded in three passes, first from both sides and then in the middle, to control the welding heat input and reduce deformation and stress concentration. During the three passes, the height is controlled by the first adjusting push rod 10 and the second adjusting push rod 11, and the inclination is controlled by the second adjusting push rod 11.

[0036] In the preferred solution, a tensioning mechanism 7 is provided on one side of the welding gun 13, and the tensioning mechanism 7 includes a tensioning seat 701 installed on the secondary telescopic mechanism 4, a tensioning motor 702 is provided on the tensioning seat 701, and a tension rod 704 is provided on the tensioning motor 702, one end of the tension rod 704 is connected to the tensioning motor 702, and the other end of the tension rod 704 is connected to the tension wheel 705, and limit switches 703 are provided at both ends of the tension rod 704; The limit switch 703 includes a trigger column and a receiver. The trigger column is installed at one end of the tension rod 704 close to the tension motor 702, and the receiver is installed on the tension motor 702. With this structure, the tension motor 702 of the tensioning mechanism 7 is in a constant torque output control mode. By adjusting the output torque of the tension motor 702, the tension applied by the tension wheel 705 to the welding wire 15 can be accurately adjusted to maintain the stability of the welding wire 15 during the welding process. When the tension rod 704 moves too much, the tension rod 704 abuts against one end of the limit switch 703, and the tension motor 702 stops the tension rod 704 from swinging, preventing the tension rod 704 from moving beyond the design range and causing an accident.

[0037] The limit switches 703 provided on both sides have the characteristics of small size, multiple functions, high precision, adjustable limit, strong versatility and easy use and adjustment.

[0038] The limit switch 703 is provided with a first sensor, which can be a line sensor or an angle sensor. When the first sensor is a line sensor, the measured distance between the first sensor and the tension rod 704 is converted into the swing angle of the tension rod 704 relative to the horizontal line. The first sensor measures the swing angle of the tension rod 704 relative to the horizontal line, which facilitates the winding of the welding wire 15 and the tension control.

[0039] The pressure sensor on the tension wheel 705 is convenient for measuring the tension on the welding wire 15 in real time, so as to adjust the tensioning motor 702 accordingly, and further accurately control the tension on the welding wire 15.

[0040] In the preferred embodiment, a pressing device 9 is provided on one side of the welding gun 13, and the pressing device 9 includes a bracket 901, and a pressing wheel 903 and a secondary pressing wheel 904 are provided on the bracket 901, and the welding wire 15 abuts between the pressing wheel 903 and the secondary pressing wheel 904, and a pressing motor 902 is provided at one end of the pressing wheel 903, and an air pipe groove 905 is provided on the bracket 901, and the air pipe 12 abuts against the air pipe groove 905; The rotating mechanism 3 is provided with an air guide wheel 16 and a primary wire control device 8, and the air pipe 12 is wound around the air guide wheel 16; The primary wire control device 8 includes a winding sleeve 801, and a wire control motor 802 is provided at one end of the winding sleeve 801. The welding wire 15 is wound on the winding sleeve 801. With this structure, the primary wire control device 8 and the pressing device 9 can actively control the feeding process of the welding wire 15. During welding, the pressing device 9 is driven to actively feed the welding wire 15 during welding. The welding wire 15 can be pressed straight by the pressing device 9, which is convenient for later welding. A tensioning mechanism 7 is added between the primary wire control device 8 and the pressing device 9 to increase the reserved welding wire space of the primary wire control device 8 and the pressing device 9. When adjusting the vertical or horizontal position of the welding gun 13, the welding wire 15 is prevented from breaking or equipment damage.

[0041] Embodiment 2: Further explanation in combination with Example 1: the PHC pipe 1 is hoisted, and the two PHC pipes 1 are butt-jointed and then the workers perform external welding; after the external weld is cooled, the internal pipe welding device is started, and the internal pipe welding device is hoisted into the PHC pipe 1 through a winch. When welding inside the PHC pipeline, multiple winches are installed on the mounting top plate, and the mounting top plate is against the port of the PHC pipe 1. The fixing mechanism 2 is lowered by the winch. By the weight of the entire device and the friction coefficient of the friction block 2024, when the fixing mechanism 2 is opened, the sliding distance is measured, and the sliding distance h of the entire device is recorded. When used for welding later, when the height is h from the welding position, the fixing mechanism 2 is opened so that the welding gun 13 is located near the welding position, and the vertical height position of the welding gun 13 is initially positioned. By driving the first adjusting push rod 10 and the second adjusting push rod 11, the camera 14 observes and accurately positions the vertical height position of the welding gun 13.

[0042] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An automatic welding machine for connecting piles inside PHC pipelines, characterized by: It comprises an opening and closing fixing mechanism (2), a rotating mechanism (3) is provided at the bottom of the fixing mechanism (2), a rotating secondary telescopic mechanism (4) is provided at the bottom of the rotating mechanism (3), a welding gun (13) is provided at one end of the secondary telescopic mechanism (4), a pressing device (9) is provided on the welding gun (13), and a primary wire control device (8) is provided on the rotating mechanism (3); The PHC tube (1) moves against the inside of the PHC tube (1).

2. The automatic welding machine for connecting piles inside PHC pipelines according to claim 1 is characterized by: The fixing mechanism (2) comprises a ring platform (201), a plurality of opening and closing devices (202) are provided at the bottom of the ring platform (201), the opening and closing devices (202) comprise a plurality of hinged diagonal braces (2023), a friction block (2024) is provided at one end of the diagonal brace (2023), and a plurality of friction strips (2025) are provided on the friction block (2024); The friction block (2024) abuts against the inner wall of the PHC tube (1).

3. The automatic welding machine for connecting piles inside PHC pipelines according to claim 2 is characterized by: A first motor (205) is provided on the top of the ring platform (201), a screw rod (204) is provided at the output end of the first motor (205), and the opening and closing device (202) comprises a ring body (2021), a screw rod sleeve (2022) is provided on the ring body (2021), and the screw rod sleeve (2022) is connected to the screw rod (204).

4. The automatic welding machine for connecting piles inside PHC pipes according to claim 3 is characterized by: The diagonal brace (2023) comprises two diagonal rods in an outward-facing structure. The diagonal brace (2023) is hinged to the ring platform (201) via a hinged rod (203). Each opening and closing device (202) has a different rotation angle relative to the ring body (2021). The ring platform (201) is connected to a winch via a steel cable (6).

5. The automatic welding machine for connecting piles inside PHC pipes according to claim 1 is characterized by: The rotating mechanism (3) comprises a fixed platform (301), a second motor (303) is provided on the fixed platform (301), a gear (304) is provided at the output end of the second motor (303), a meshing gear ring (302) is provided on the gear (304), a rotating column (306) is provided at the bottom of the gear ring (302), the rotating column (306) is rotatably connected to the fixed platform (301), and the fixed platform (301) is connected to the fixed mechanism (2) via a plurality of connecting rods (305).

6. The automatic welding machine for connecting piles inside PHC pipelines according to claim 5 is characterized by: A round platform (307) is provided at the bottom of the rotating column (306), a through groove (3061) is provided on the rotating column (306), a secondary telescopic mechanism (4) is provided on the round platform (307), and a first sliding groove (3071) is provided on the round platform (307).

7. The automatic welding machine for connecting piles inside PHC pipelines according to claim 1 is characterized by: The secondary telescopic mechanism (4) comprises a first rigid chain transmission device (401), a second rigid chain transmission device (402) and a slide plate (403); the slide plate (403) is provided with a second slide groove (4031); one end of the slide plate (403) slides against the first slide groove (3071); the first rigid chain transmission device (401) comprises a rotating drum (4013) and a connecting plate (4011) mounted on the rotating mechanism (3); the connecting plate (4011) is connected to the rotating drum (4013) via a rigid chain (4012); The second rigid chain transmission device (402) is connected end to end with the first rigid chain transmission device (401); the second rigid chain transmission device (402) and the first rigid chain transmission device (401) have the same structure; a connecting plate (404) is provided at the bottom of the second rigid chain transmission device (402); the connecting plate (404) slides against the second slide groove (4031); and an arc-shaped baffle plate (405) is provided at the bottom of the first rigid chain transmission device (401).

8. The automatic welding machine for connecting piles inside PHC pipelines according to claim 1 is characterized by: A first adjusting push rod (10) and a second adjusting push rod (11) are provided between the secondary telescopic mechanism (4) and the welding gun (13); one end of the first adjusting push rod (10) and the second adjusting push rod (11) are both hinged to the welding gun (13); and a camera (14) is provided on one side of the secondary telescopic mechanism (4); A wire supply box (5) is provided on the top of the fixing mechanism (2), a wire supply motor (501) is provided on one side of the wire supply box (5), and one end of the welding wire (15) output by the wire supply box (5) is mounted on one side of the welding gun (13).

9. The automatic welding machine for connecting piles inside PHC pipelines according to claim 1 is characterized by: A tensioning mechanism (7) is provided on one side of the welding gun (13), the tensioning mechanism (7) comprising a tensioning seat (701) mounted on the secondary telescopic mechanism (4), a tensioning motor (702) being provided on the tensioning seat (701), a tensioning rod (704) being provided on the tensioning motor (702), one end of the tensioning rod (704) being connected to the tensioning motor (702), the other end of the tensioning rod (704) being connected to a tensioning wheel (705), and limit switches (703) being provided at both ends of the tensioning rod (704); The limit switch (703) comprises a trigger column and a receiver. The trigger column is mounted on one end of the tension rod (704) close to the tension motor (702), and the receiver is mounted on the tension motor (702).

10. The automatic welding machine for connecting piles inside PHC pipelines according to claim 1, characterized in that: A pressing device (9) is provided on one side of the welding gun (13), the pressing device (9) comprising a bracket (901), a pressing wheel (903) and a secondary pressing wheel (904) are provided on the bracket (901), the welding wire (15) abuts between the pressing wheel (903) and the secondary pressing wheel (904), a pressing motor (902) is provided at one end of the pressing wheel (903), an air pipe groove (905) is provided on the bracket (901), and the air pipe (12) abuts against the air pipe groove (905); An air guide wheel (16) and a primary wire control device (8) are provided on the rotating mechanism (3), and the air pipe (12) is wound around the air guide wheel (16); The primary wire control device (8) comprises a winding sleeve (801), one end of which is provided with a wire control motor (802), and the welding wire (15) is wound around the winding sleeve (801).

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