Welded pipe straightening device and using method thereof

Abstract

The invention discloses a welded pipe straightening device and a using method thereof, and relates to the technical field of steel pipe machining, the welded pipe straightening device comprises an operation table, a central processing unit for receiving and processing data is integrated in an inner cavity of the operation table, and a bottom plate is fixedly arranged on the outer side face of the operation table; the pushing mechanism is used for pushing a welded steel pipe to move transversely, and the pushing mechanism is fixedly arranged on the upper surface of the bottom plate; the heating mechanism is used for heating a steel pipe needing to be straightened, and the heating mechanism is fixedly arranged on the upper surface of the operation table; the automatic straightening mechanism is used for detecting the bending position of the steel pipe and automatically straightening the steel pipe, and the automatic straightening mechanism is fixedly arranged on the outer surface of the heating mechanism; and the heating mechanism comprises a heating box, the heating box is fixedly arranged at the position of an inner cavity of the operation table, a dividing box is fixedly arranged at the position of the inner wall of the heating box, and the effect of automatically detecting the bending position of the steel pipe and straightening the steel pipe is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel pipe processing, in particular to a welded pipe straightening device and a using method thereof. BACKGROUND

[0002] Welded pipe straightening is a key link in the post-process of welded pipe production, and its main purpose is to eliminate the plastic deformation such as bending and excessive ovality of the pipe material generated in the forming, welding and cooling process, and to ensure that the straightness, roundness and other geometric dimensions meet the strict product standards. This process is usually implemented on a special straightening machine. Its core principle is to continuously and repeatedly bend the pipe material in multiple directions through multiple sets of staggered straightening rollers (or straightening dies). During the straightening process, the pipe material is subjected to pressure in multiple directions, causing the original curvature to undergo reverse plastic deformation, thereby redistributing and eliminating the uneven residual stress, and ultimately achieving a straight state after elastic recovery. For high-precision pipe materials, a multi-roller straightening machine is often used to achieve comprehensive correction of bending vector height, ovality and other parameters by precisely adjusting the penetration amount and position of each roller. Most conventional welded pipe straightening devices on the market focus on executing the preset "straightening" action, but there are significant shortcomings in the key "intelligent sensing" link. Specifically, these devices usually cannot identify and locate the bending points (such as local hard bends and gentle bends) on the pipe material and their specific bending vectors (direction and curvature) online, automatically and accurately. The lack of this function directly leads to a high dependence on human experience in the production process. SUMMARY

[0003] To achieve the above purpose, the present application is realized by the following technical scheme: a welded pipe straightening device, comprising an operating table, a central processing unit for receiving and processing data is integrated in the inner cavity of the operating table, a bottom plate is fixedly arranged on the outer side of the operating table; a pushing mechanism for pushing the welded steel pipe to move laterally, the pushing mechanism is fixedly arranged on the upper surface of the bottom plate; a heating mechanism for heating the steel pipe that needs to be straightened, the heating mechanism is fixedly arranged on the upper surface of the operating table; an automatic straightening mechanism for detecting the bending position of the steel pipe and automatically straightening, the automatic straightening mechanism is fixedly arranged on the outer surface of the heating mechanism; The heating mechanism comprises a heating box, the heating box is fixedly arranged in the inner cavity of the operating table, a partition box is fixedly arranged on the inner wall of the heating box, an arc-shaped air permeable plate is fixedly arranged on the bottom surface of the inner cavity of the partition box, and a square hole is formed in the upper surface of the heating box.

[0004] Preferably, the pushing mechanism comprises a first stepper motor and a positioning track, the first stepper motor is fixed on the inner surface of the bottom plate, the output end of the first stepper motor is provided with a lead screw through a shaft coupling, the end of the lead screw is rotatably connected to the outer surface of the operation table, the positioning track is symmetrically arranged on both sides of the lead screw, the positioning track is fixed on the outer surface of the bottom plate, the outer surface of the lead screw is movably connected with a sliding plate, the corner of the lower surface of the sliding plate is fixed with a sliding sleeve, and the sliding sleeve is slidably connected to the positioning track.

[0005] Preferably, the upper surface of the sliding plate is fixed with a connecting frame, the top end of the connecting frame is fixed with a wrapping box, the inner cavity of the wrapping box is fixed with a second stepper motor, the output end of the second stepper motor is fixed with a rotating rod, the end of the rotating rod is fixed with a rotating sleeve, the outer ring of the rotating sleeve is fixed with a first rolling bearing, and the outer ring of the first rolling bearing is fixed on the inner wall of the wrapping box.

[0006] Preferably, the outer surface of the rotating sleeve is fixed with a gasket, and the outer surface of the rotating sleeve is fixed with an anti-skid ring which is a rubber ring with one end inner diameter slightly larger than the other end inner diameter, and the inner surface of the anti-skid ring is provided with a plurality of evenly distributed anti-skid grooves.

[0007] Preferably, the heating mechanism further comprises a heating furnace and a blower, the heating furnace is fixed on the upper surface of the operation table, the blower is fixed on the upper surface of the operation table, the gas outlet of the heating furnace is in communication with the air inlet of the blower, the end of the outer surface of the heating box close to the blower penetrates an air inlet pipe, and the air inlet pipe is in communication with the air outlet end of the blower through a communication pipe.

[0008] Preferably, the end of the outer surface of the heating box away from the air inlet pipe penetrates an exhaust pipe, the end of the air inlet pipe and the exhaust pipe in the inner cavity of the heating box is wrapped by the dividing box, the arc surface of the arc-shaped air-permeable plate is fixed with a support strip, the surface of the support strip is provided with an air-permeable hole, the support strip is used for supporting the bottom of the steel pipe, and the outer surface of the heating box is provided with a plurality of exhaust holes which are in communication with the inner cavity of the dividing box.

[0009] Preferably, the automatic straightening mechanism comprises a detection end and a straightening end, the number of the detection end of the automatic straightening mechanism is two, and the two detection ends are respectively arranged at the two ends of the heating box, the detection end of the automatic straightening mechanism comprises a fixed ring, the fixed ring is fixed on the end of the heating box, the upper surface and the lower surface of the fixed ring are both fixed with a limiting tube, and the end of the limiting tube away from the fixed ring is fixed with a communication box.

[0010] Preferably, the upper surface of the top communication box is penetrated by an air inlet valve for connecting an external compressor, the lower surface of the bottom communication box is penetrated by a pressure valve for detecting the size of the internal air pressure of the communication box, the inner cavity of the limiting tube is slidingly connected with a piston rod, the end of the piston rod is fixedly provided with a spring, the end of the spring is fixedly provided on the inner wall of the limiting tube, the end of the piston rod away from the spring is fixedly provided with an arc plate, the arc plate is located in the inner cavity of the fixing ring, the surface of the arc plate is fixedly provided with a positioning sleeve, the inner wall of the positioning sleeve is fixedly provided with a fixing block, the outer surface of the fixing block is fixedly provided with a second rolling bearing, the outer ring of the second rolling bearing is fixedly provided with a rolling ball, and the rolling ball is a rubber ball with a plurality of evenly distributed anti-skid grooves on the outer surface.

[0011] Preferably, the straightening end of the automatic straightening mechanism comprises a support frame fixedly provided on the outer surface of the heating box, an oil cylinder fixedly connected to the top end of the support frame, an extrusion rod fixedly provided on the movable end of the oil cylinder, and an extrusion block fixedly provided on the bottom end of the extrusion rod, wherein the lower surface of the extrusion block is fixedly provided with a rubber pad, and the extrusion block is movably connected to the square hole provided on the upper surface of the heating box.

[0012] A method for using a welded pipe straightening device, comprising the following steps: Step one: place the welded steel pipe to be straightened horizontally on the arc-shaped air permeable plate inside the heating box, with one end of the steel pipe extending into the pushing mechanism to complete the preliminary clamping, start the pushing mechanism to drive the steel pipe to rotate at low speed while moving horizontally slowly, so as to smoothly and coaxially push the steel pipe into the inner cavities of the heating box and the automatic straightening mechanisms at both ends until the front end of the steel pipe reaches the predetermined straightening station; Step two: after the steel pipe is in place, start the detection end of the automatic straightening mechanism, since the steel pipe is bent, the gap between the outer wall of the steel pipe and the automatic straightening mechanism changes when it rotates, causing the internal air pressure of the automatic straightening mechanism to fluctuate, the sensor inside the automatic straightening mechanism monitors and records the air pressure change data in real time, and sends the data to the central processor, the central processor analyzes the air pressure time sequence data of each detection point, calculates the bending curvature of the steel pipe, the circumferential angle and the specific position along the axial direction of the maximum bending point, and completes the accurate positioning of the bending point; Step three: according to the bending point position determined by the central processor, adjust the axial position of the steel pipe to accurately align the maximum bending point with the square hole area above the heating box, start the heating mechanism, hot air enters the partition box through the air inlet pipe, and uniformly penetrates out of the arc-shaped air permeable plate, preheats the whole steel pipe located thereon, then hot air concentrates and overflows from the square hole aligned with the bending point, concentrates and controllably heats the bending point and its adjacent area of the steel pipe, so that it reaches a temperature suitable for plastic straightening, and the heating temperature and range can be controlled by adjusting the power during the heating process. Step four: when the bending point area reaches the predetermined straightening temperature, the straightening end of the automatic straightening mechanism is started to apply a vertical downward pressure on the heated steel pipe bending point, while the steel pipe is kept rotating slowly under the driving of the pushing mechanism, the pressure and the rotating movement of the steel pipe are combined to realize the multi-point and gradual pressure straightening of the bending point.

[0013] The present application provides a welded pipe straightening device and its use method. It has the following beneficial effects: I. The welded pipe straightening device and its use method, by setting the pushing mechanism, undertakes the automatic feeding, axial feeding, rotating driving and synchronous rotating coordination tasks in the straightening process, is the key power unit to realize the accurate and stable movement and rotation of the steel pipe between the detection and straightening stations.

[0014] II. The welded pipe straightening device and its use method, by setting the heating mechanism, is the key process unit for the plastic deformation characteristics of metal materials, through overall preheating and local precise heating of the steel pipe, the yield strength is reduced, the plasticity is improved, the subsequent straightening process is more labor-saving and efficient, and the internal stress concentration or micro-cracks that may be generated by cold straightening can be effectively avoided, which is a necessary condition to realize high-quality straightening.

[0015] III. The welded pipe straightening device and its use method, by setting the automatic straightening mechanism, integrates the non-contact bending detection and hydraulic execution straightening functions, is the core embodiment of the device to realize the intelligence of "perception-analysis-execution", which can automatically identify the bending point, calculate the straightening amount and apply accurate correction force.

[0016] IV. The welded pipe straightening device and its use method, by setting the heating furnace, blower, connecting pipe and air inlet pipe, constitutes the hot air generation and conveying system of the heating mechanism, the heating furnace generates high temperature through electric heating elements, the blower provides stable air pressure and flow, and the heat generated by the heating furnace is forced into the heating box in the form of convection hot air through the connecting pipe and air inlet pipe. This forced convection heating method is more uniform and controllable than radiation heating, and has high thermal efficiency, which can quickly make the steel pipe reach the process temperature.

[0017] V. The welded pipe straightening device and its use method, by clearly dividing the automatic straightening mechanism into detection end and straightening end, and setting two detection ends located at both ends of the heating box, constitutes a bending detection system based on the three-point bending principle. The fixed ring serves as the installation base of the detection sensor, the limiting pipe serves as the guide cylinder of the pneumatic piston, and the connecting box serves as the installation cavity of the pneumatic sensor and the gas path connection node. This symmetrical arrangement can accurately calculate the amplitude, direction and axial position of the bending by the phase difference and amplitude change of the detection data at both ends when the steel pipe rotates. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1It is the external structure schematic view of the welded pipe straightening device of the present application; Figure 2 It is the structure top view of the welded pipe straightening device of the present application; Figure 3 It is the push mechanism structure schematic view of the present application; Figure 4 It is the push mechanism local section structure schematic view of the present application; Figure 5 It is the heating mechanism structure schematic view of the present application; Figure 6 It is the heating mechanism local structure schematic view of the present application; Figure 7 It is the heating mechanism section structure schematic view of the present application; Figure 8 It is the automatic straightening mechanism structure schematic view of the present application; Figure 9 It is the automatic straightening mechanism local section structure schematic view of the present application; Figure 10 It is the automatic straightening mechanism straightening end structure schematic view of the present application.

[0019] In the figure: 1, operation table; 2, bottom plate; 3, push mechanism; 31, first step motor; 32, positioning track; 33, screw rod; 34, sliding sleeve; 35, sliding plate; 36, connecting frame; 37, wrapping box; 38, second step motor; 39, rotating rod; 310, rotating sleeve; 311, first rolling bearing; 312, washer; 313, anti-skid ring; 4, heating mechanism; 41, heating furnace; 42, air blower; 43, communication pipe; 44, heating box; 45, air inlet pipe; 46, exhaust pipe; 47, exhaust hole; 48, square hole; 49, divided box; 410, arc-shaped air permeable plate; 411, support strip; 5, automatic straightening mechanism; 51, fixed ring; 52, limiting tube; 53, communication box; 54, air inlet valve; 55, pressure valve; 56, piston rod; 57, spring; 58, arc-shaped plate; 59, positioning sleeve; 510, fixed block; 511, second rolling bearing; 512, rolling ball; 513, support frame; 514, oil cylinder; 515, extrusion rod; 516, extrusion block; 517, rubber pad. DETAILED DESCRIPTION

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0021] like Figures 1-10 As shown, this invention provides a technical solution: a welded pipe straightening device, including an operating table 1. A central processing unit (CPU) for receiving and processing data is integrated within the inner cavity of the operating table 1, and a base plate 2 is fixed to the outer surface of the operating table 1. By setting up the operating table 1 and the integrated CPU, an intelligent control and data processing core is provided for the entire straightening device. The operating table 1 serves as the main structural component and electrical integration platform. The CPU is responsible for receiving sensor data, performing calculations and analyses such as bending calculation and position positioning, and sending precise commands to each actuator for pushing, heating, and straightening, thereby achieving closed-loop automated control of the entire process. The pushing mechanism 3 is used to push the welded steel pipe to move laterally. The pushing mechanism 3 is fixed on the upper surface of the base plate 2. By setting the pushing mechanism 3, it undertakes the tasks of automatic feeding, axial feeding, rotary drive, and synchronous rotation coordination during the straightening process of the steel pipe. It is a key power unit to realize the accurate and stable movement and rotation of the steel pipe between the inspection and straightening stations. Heating mechanism 4 is used to heat the steel pipe that needs to be straightened. Heating mechanism 4 is fixed on the upper surface of the operating table 1. By setting up heating mechanism 4, a key process unit targeting the plastic deformation characteristics of metal materials, the yield strength of the steel pipe is reduced and its plasticity is improved through overall preheating and localized precise heating. This makes the subsequent straightening process more labor-saving and efficient, and can effectively avoid internal stress concentration or microcracks that may occur during cold straightening. It is an essential condition for achieving high-quality straightening. The automatic straightening mechanism 5 is used to detect the bending position of the steel pipe and automatically straighten it. The automatic straightening mechanism 5 is fixed on the outer surface of the heating mechanism 4. By setting the automatic straightening mechanism 5, two major functions are integrated: non-contact bending detection and hydraulic straightening. It is the core embodiment of the device's "sensing-analysis-execution" intelligence. It can automatically identify the bending point, calculate the straightening amount, and apply precise straightening force. The heating mechanism 4 comprises a heating box 44 fixed at the inner cavity of the operation table 1, an inner wall of the heating box 44 is fixed with a partition box 49, an inner bottom surface of the partition box 49 is fixed with an arc-shaped air permeable plate 410, and a square hole 48 is formed in the upper surface of the heating box 44. By arranging the heating box 44, the partition box 49, the arc-shaped air permeable plate 410 and the square hole 48, a hot air heating chamber with controllable partition is formed, the heating box 44 is the main heat preservation cavity, the partition box 49 is used for guiding and distributing hot air flow, the arc-shaped air permeable plate 410 supports the bottom of the steel pipe and realizes uniform penetration heating of the hot air, and the square hole 48 is a controllable opening reserved for local fixed-point heating and upper straightening pressure head action.

[0022] The pushing mechanism 3 comprises a first stepping motor 31 and a positioning track 32, the first stepping motor 31 is fixed on the inner surface of the bottom plate 2, the output end of the first stepping motor 31 is provided with a lead screw 33 through a shaft coupling, the end of the lead screw 33 is rotatably connected to the outer surface of the operation table 1, the positioning track 32 is symmetrically arranged on both sides of the lead screw 33, the positioning track 32 is fixed on the outer surface of the bottom plate 2, the outer surface of the lead screw 33 is movably connected with a sliding plate 35, the corner of the lower surface of the sliding plate 35 is fixed with a sliding sleeve 34, and the sliding sleeve 34 is slidably connected to the positioning outer surface of the positioning track 32. By arranging the first stepping motor 31, the lead screw 33, the positioning track 32, the sliding sleeve 34 and the sliding plate 35, a high-precision and high-rigidity linear feeding system is formed, the first stepping motor 31 provides accurate angular displacement control, the lead screw 33 converts it into high-precision linear displacement, the symmetrically arranged positioning track 32 and sliding sleeve 34 form a double-rail support, effectively resist the overturning moment, ensure that the sliding plate 35 and the upper clamping mechanism can still move smoothly along the strict straight line under heavy load, without climbing or shaking, and provide protection for the accurate positioning of the steel pipe.

[0023] The upper surface of the sliding plate 35 is fixed with a connecting frame 36, the top end of the connecting frame 36 is fixed with a wrapping box 37, the inner cavity of the wrapping box 37 is fixed with a second stepping motor 38, the output end of the second stepping motor 38 is fixed with a rotating rod 39, the end of the rotating rod 39 is fixed with a rotating sleeve 310, the outer ring of the rotating sleeve 310 is fixed with a first rolling bearing 311, and the outer ring of the first rolling bearing 311 is fixed on the inner wall of the wrapping box 37. By arranging the connecting frame 36, the wrapping box 37, the second stepping motor 38, the rotating rod 39, the rotating sleeve 310 and the first rolling bearing 311, a rotating drive and front-end clamping unit of the steel pipe is formed, the connecting frame 36 provides transition support, the wrapping box 37 protects the internal motor, the second stepping motor 38 provides controllable rotating torque, the rotating rod 39 transmits power, the rotating sleeve 310 is a component for directly clamping the steel pipe, and the first rolling bearing 311 provides high-precision rotating support for it, ensuring that the steel pipe rotates with high concentricity and runs smoothly, which is crucial for subsequent rotation detection and rotary straightening.

[0024] The outer surface of the rotating sleeve 310 is fixedly provided with a gasket 312, and the outer surface of the rotating sleeve 310 is fixedly provided with an anti-skid ring 313, which is a rubber ring with one end inner diameter slightly larger than the other end inner diameter, and the inner surface of the anti-skid ring 313 is provided with a plurality of evenly distributed anti-skid grooves. By setting the gasket 312 and the anti-skid ring 313, a flexible self-adaptive sealing and high-friction transmission interface between the rotating sleeve 310 and the end of the steel pipe is formed. The gasket 312 may function as axial limiting or buffering, and the anti-skid ring 313 is designed with a taper to facilitate the insertion of the steel pipe. The anti-skid grooves on the inner surface of the anti-skid ring 313, combined with the rubber material, can generate a large static friction force under moderate gripping force, ensuring that the rotational torque of the motor is effectively transmitted to the steel pipe without slipping. At the same time, its elastic properties can adapt to a certain range of steel pipe outer diameter tolerance, and protect the end surface of the steel pipe from being scratched by hard clamps.

[0025] The heating mechanism 4 further comprises a heating furnace 41 and a blower 42, the heating furnace 41 is fixedly arranged on the upper surface of the operation table 1, the blower 42 is fixedly arranged on the upper surface of the operation table 1, the gas outlet of the heating furnace 41 is in communication with the air inlet of the blower 42, and the outer surface of the heating box 44 is penetrated by an air inlet pipe 45 near one end of the blower 42, and the air inlet pipe 45 is in communication with the air outlet end of the blower 42 through a communication pipe 43. By setting the heating furnace 41, the blower 42, the communication pipe 43 and the air inlet pipe 45, a hot air generation and delivery system of the heating mechanism 4 is formed. The heating furnace 41 generates high temperature through electric heating elements, and the blower 42 provides stable air pressure and flow rate. The heat generated by the heating furnace 41 is forced to blow into the heating box 44 in the form of convection hot air through the communication pipe 43 and the air inlet pipe 45. This forced convection heating method is more uniform, more controllable and has high thermal efficiency than radiation heating, and can quickly heat the steel pipe to the process temperature.

[0026] The outer surface of the heating box 44 is penetrated by an exhaust pipe 46 away from one end of the air inlet pipe 45, and the end of the air inlet pipe 45 and the exhaust pipe 46 in the inner cavity of the heating box 44 is wrapped by a partition box 49. The arc surface of the arc-shaped air-permeable plate 410 is fixedly provided with a support strip 411, and the surface of the support strip 411 is provided with air-permeable holes. The support strip 411 is used for supporting the bottom of the steel pipe. The outer surface of the heating box 44 is provided with a plurality of exhaust holes 47, and the exhaust holes 47 are in communication with the inner cavity of the partition box 49. By setting the exhaust pipe 46, the support strip 411 and the exhaust holes 47, the heat field distribution and air flow organization inside the heating box 44 are optimized. The exhaust pipe 46 cooperates with the air inlet pipe 45 to form a reasonable air flow path under the guidance of the partition box 49. The support strip 411 supports the steel pipe, and the air-permeable holes on the support strip 411 ensure that the hot air can uniformly seep out from multiple contact points at the bottom of the steel pipe, realizing circumferential heating, reducing temperature dead angles, and the exhaust holes 47 are used for adjusting the air pressure in the box and discharging excess heat, preventing the pressure in the box from being too high or heat accumulation. The whole design aims to realize uniform, controllable and efficient heating of the steel pipe.

[0027] The automatic straightening mechanism 5 includes a detection end and a straightening end. The automatic straightening mechanism 5 has two detection ends, which are respectively located at both ends of the heating box 44. Each detection end of the automatic straightening mechanism 5 includes a fixing ring 51, which is fixed to the end of the heating box 44. Limiting tubes 52 are fixed to both the upper and lower surfaces of the fixing ring 51. A connecting box 53 is fixed to the end of each limiting tube 52 away from the fixing ring 51. By clearly dividing the automatic straightening mechanism 5 into a detection end and a straightening end, and setting two detection ends at both ends of the heating box 44, a bending detection system based on the three-point bending principle is formed. The fixing ring 51 serves as the mounting base for the detection sensor, the limiting tube 52 serves as the guide cylinder for the pneumatic piston, and the connecting box 53 serves as the mounting cavity for the pneumatic sensor and the air passage connection node. This symmetrical arrangement allows for precise calculation of the bending amplitude, direction, and axial position by monitoring the phase difference and amplitude changes of the data from both ends when the steel pipe rotates.

[0028] An intake valve 54 is passed through the upper surface of the top connecting box 53, which is used to connect to an external compressor. A pressure valve 55 is passed through the lower surface of the bottom connecting box 53, which is used to detect the air pressure inside the connecting box 53. A piston rod 56 is slidably connected to the inner cavity of the limiting tube 52. A spring 57 is fixed at the end of the piston rod 56. The end of the spring 57 is fixed to the inner wall of the limiting tube 52. An arc-shaped plate 58 is fixed at the end of the piston rod 56 away from the spring 57. The arc-shaped plate 58 is located in the inner cavity of the fixing ring 51. A positioning sleeve 59 is fixed on the surface of the arc-shaped plate 58. A fixing block 510 is fixed on the inner wall of the positioning sleeve 59. A second rolling bearing 511 is fixed on the outer surface of the fixing block 510. A ball 512 is fixed on the outer ring of the second rolling bearing 511. The ball 512 is a rubber ball with several evenly distributed anti-slip grooves on its outer surface. By incorporating an intake valve 54, a pressure valve 55, a piston rod 56, a spring 57, an arc-shaped plate 58, a positioning sleeve 59, a fixing block 510, a second rolling bearing 511, and a ball bearing 512, a precision non-contact pneumatic displacement sensor and a low-resistance rotary support unit are constructed. The intake valve 54 is connected to a constant air pressure source to establish an initial air pressure in the detection chamber. The pressure valve 55 is actually a high-precision air pressure sensor that monitors changes in air pressure within the chamber in real time. The piston rod 56 and the spring 57 form a floating measuring head, and the ball bearing 512 on the arc-shaped plate 58... 2. Free rolling is achieved through the second rolling bearing 511. When the steel pipe rotates and passes through the detection end, its outer surface contacts the rolling ball 512. If the steel pipe is bent, its outer wall will periodically push the rolling ball 512 and the arc plate 58, compress the spring 57 and push the piston rod 56 to move slightly, thereby changing the volume of the sealed detection chamber and causing a precise change in air pressure. The pressure sensor converts this air pressure change signal into a displacement signal and transmits it to the central processing unit for analysis. The design of the rolling ball 512 greatly reduces the sliding friction between it and the rotating steel pipe.

[0029] The straightening end of the automatic straightening mechanism 5 includes a support frame 513, which is fixed on the outer surface of the heating box 44. A hydraulic cylinder 514 is fixedly connected to the top of the support frame 513. A pressing rod 515 is fixedly provided at the movable end of the hydraulic cylinder 514. A pressing block 516 is fixedly provided at the bottom end of the pressing rod 515. A rubber pad 517 is fixedly provided on the lower surface of the pressing block 516. The pressing block 516 is movably connected to the square hole 48 opened on the upper surface of the heating box 44. The support frame 513, hydraulic cylinder 514, extrusion rod 515, extrusion block 516, and rubber pad 517 constitute the final execution unit for the straightening action. The support frame 513 provides high rigidity support to resist the huge straightening reaction force. The hydraulic cylinder 514 provides stable and precisely controllable thrust. The extrusion rod 515 transmits pressure. The extrusion block 516 acts on the steel pipe through the square hole 48. The rubber pad 517 at its lower part protects the surface of the steel pipe from hard pressure damage while also increasing contact friction to prevent the steel pipe from deflecting under pressure. The rubber pad 517 is made of high-temperature resistant rubber. According to the instructions of the central processing unit, the straightening end applies precise and programmable pressure directly above the heated bending point. Combined with the rotation of the steel pipe, multi-angle and progressive pressure straightening is achieved.

[0030] A method of using a welded pipe straightening device includes the following steps: Step 1: Place the welded steel pipe to be straightened horizontally on the arc-shaped vent plate 410 inside the heating box 44. One end of the steel pipe extends into the pushing mechanism 3 to complete the initial clamping. Start the pushing mechanism 3 to drive the steel pipe to rotate at a low speed and move laterally slowly, so as to push the steel pipe smoothly and coaxially into the heating box 44 and the inner cavity of the automatic straightening mechanism 5 at both ends until the front end of the steel pipe reaches the predetermined straightening position. Step 2: After the steel pipe is in place, the detection end of the automatic straightening mechanism 5 is activated. Due to the bending of the steel pipe, the gap between the outer wall and the automatic straightening mechanism 5 will change when it rotates, causing the air pressure inside the automatic straightening mechanism 5 to fluctuate accordingly. The sensors inside the automatic straightening mechanism 5 monitor and record the air pressure change data in real time and send the data to the central processing unit. The central processing unit analyzes the air pressure time sequence data of each detection point, calculates the bending arc of the steel pipe, the circumferential angle of the maximum bending point, and the specific position along the axial direction, and completes the precise positioning of the bending point. Step 3: Based on the bending point position determined by the central processing unit, adjust the axial position of the steel pipe so that the maximum bending point is precisely aligned with the square hole 48 area above the heating box 44. Start the heating mechanism 4. Hot air enters the dividing box 49 through the air inlet pipe 45 and seeps out evenly from the arc-shaped vent plate 410 to preheat the entire steel pipe located thereon. Then, the hot air overflows from the square hole 48 aligned with the bending point to provide concentrated and controllable local heating to the bending point of the steel pipe and its adjacent area, so that it reaches a temperature suitable for plastic straightening. During the heating process, the heating temperature and range can be controlled by adjusting the power. Step 4: When the bending point area reaches the predetermined straightening temperature, start the straightening end of the automatic straightening mechanism 5 to apply vertical downward pressure to the heated steel pipe bending point. At the same time, the steel pipe is slowly rotated under the drive of the pushing mechanism 3. The pressure and the rotation of the steel pipe are combined to achieve multi-point, progressive pressure straightening of the bending point.

[0031] Working principle: The welded steel pipe to be straightened is placed horizontally on the arc-shaped vent plate 410 inside the heating box 44. One end of the steel pipe extends into the rotating sleeve 310 of the pushing mechanism 3, so that the anti-slip ring 313 is in close contact with the outer wall of the steel pipe, completing the initial clamping. The second stepper motor 38 is started, driving the rotating sleeve 310 to rotate the steel pipe at a low speed. At the same time, the first stepper motor 31 is started, driving the sliding plate 35 and the wrapping box 37 to move slowly laterally through the lead screw 33, thereby smoothly and coaxially pushing the steel pipe into the heating box 44 and the inner cavity of the fixing rings 51 at both ends, until the front end of the steel pipe reaches the predetermined straightening position. During this process, the rolling ball 512 in the fixing ring 51 rolls in contact with the outer wall of the steel pipe to achieve auxiliary positioning and support. After the steel pipe is in place, the detection end of the automatic straightening mechanism 5 is activated. Pre-pressurized compressed gas is introduced into the top connecting box 53 through the air inlet valve 54. The gas pushes the piston rod 56 inside the limiting tube 52 to move outward against the spring force of the spring 57, thereby causing the arc plate 58 and the rolling ball 512 to approach and eventually fit tightly against the surface of the steel pipe. The steel pipe is kept rotating at a low, uniform speed driven by the second stepper motor 38. Due to the bending of the steel pipe, the gap between the outer wall and the rolling ball 512 at each detection point changes periodically during rotation, causing the air pressure inside each limiting tube 52 to fluctuate accordingly. The air pressure change data is monitored and recorded in real time through the pressure valve 55 and sent to the central processing unit. The central processing unit analyzes the air pressure timing data at each detection point, calculates the bending arc of the steel pipe, the circumferential angle of the maximum bending point, and the specific position along the axial direction, thus completing the precise positioning of the bending point. Based on the bending point location determined by the central processing unit, the axial position of the steel pipe is adjusted so that the maximum bending point is precisely aligned with the square hole 48 area above the heating box 44. The heating furnace 41 and blower 42 are started, and hot air enters the dividing box 49 through the air inlet pipe 45 and seeps out evenly from the arc-shaped vent plate 410, preheating the entire steel pipe located thereon. Subsequently, the hot air overflows from the square hole 48 aligned with the bending point, providing concentrated and controllable local heating to the bending point and its adjacent area of ​​the steel pipe, bringing it to a temperature suitable for plastic straightening. During the heating process, the heating temperature and range can be controlled by adjusting the power of the heating furnace 41, the air volume of the blower 42, or the local heat preservation time. Once the bending point reaches the predetermined straightening temperature, the straightening end of the automatic straightening mechanism 5 is activated. The hydraulic cylinder 514 drives the pressing rod 515 and pressing block 516 downwards, causing the rubber pad 517 to apply vertical downward pressure to the heated steel pipe bending point through the square hole 48. Simultaneously, the steel pipe rotates slowly under the drive of the second stepper motor 38. The pressure of the pressing block 516 combines with the rotational motion of the steel pipe to achieve multi-point, progressive pressure straightening of the bending point. During the straightening process, the central processing unit can dynamically fine-tune the downward pressure and holding time of the hydraulic cylinder 514 according to a preset program or real-time pressure feedback data. After the straightening action is completed, the hydraulic cylinder 514 retracts the pressing block 516. Heating is stopped, allowing the steel pipe to cool and solidify slowly in the heating chamber 44 or in natural air. After cooling, the testing process can be restarted to verify the straightening effect. After confirming that the straightening is qualified, the steel pipe is moved out of the device in the opposite direction by the pushing mechanism 3, completing the straightening operation of a single steel pipe.

[0032] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A welded pipe straightening device, comprising an operating table (1), the inner cavity of the operating table (1) is integrated with a central processor for receiving and processing data, and the outer side of the operating table (1) is fixedly provided with a bottom plate (2), characterized in that: a pushing mechanism (3) is arranged on the upper surface of the bottom plate (2) and used for pushing the welded steel pipe to move laterally; a heating mechanism (4) is arranged on the upper surface of the operating table (1) and used for heating the steel pipe to be straightened; and an automatic straightening mechanism (5) is arranged on the outer surface of the heating mechanism (4) and used for detecting the bending position of the steel pipe and automatically straightening. The heating mechanism (4) comprises a heating box (44) fixedly arranged in the inner cavity of the operating table (1), a partition box (49) fixedly arranged on the inner wall of the heating box (44), an arc-shaped air permeable plate (410) fixedly arranged on the bottom surface of the inner cavity of the partition box (49), and a square hole (48) formed in the upper surface of the heating box (44). The pushing mechanism (3) comprises a first stepping motor (31) fixedly arranged on the inner surface of the bottom plate (2), a lead screw (33) connected to the output end of the first stepping motor (31) through a shaft coupling, an end portion of the lead screw (33) rotatably connected to the outer surface of the operating table (1), and a positioning track (32) symmetrically arranged on both sides of the lead screw (33) and fixedly arranged on the outer surface of the bottom plate (2). The outer surface of the lead screw (33) movably connects a sliding plate (35), the bottom surface of the sliding plate (35) is fixedly provided with a sliding sleeve (34) arranged at the corner, and the sliding sleeve (34) is slidably connected to the positioning track (32). The upper surface of the sliding plate (35) is fixedly provided with a connecting frame (36), the top end of the connecting frame (36) is fixedly provided with a wrapping box (37), the inner cavity of the wrapping box (37) is fixedly provided with a second stepping motor (38), the output end of the second stepping motor (38) is fixedly provided with a rotating rod (39), the end portion of the rotating rod (39) is fixedly provided with a rotating sleeve (310), the outer ring of the rotating sleeve (310) is fixedly provided with a first rolling bearing (311), and the outer ring of the first rolling bearing (311) is fixedly arranged on the inner wall of the wrapping box (37).

2. A pipe straightening device as defined in claim 1, characterized in that: The outer surface of the rotating sleeve (310) is fixedly provided with a gasket (312), the outer surface of the rotating sleeve (310) is fixedly provided with an anti-skid ring (313), the anti-skid ring (313) is a rubber ring with one end inner diameter slightly larger than the other end inner diameter, and the inner surface of the anti-skid ring (313) is provided with a plurality of evenly distributed anti-skid grooves.

3. A pipe straightening device as defined in claim 2, wherein: ​ 4. A pipe straightening device as defined in claim 3, wherein: ​ 5. A pipe straightening device as defined in claim 1 wherein: The heating mechanism (4) further comprises a heating furnace (41) and a blower (42), the heating furnace (41) is fixed on the upper surface of the operation table (1), the blower (42) is fixed on the upper surface of the operation table (1), the gas outlet of the heating furnace (41) is communicated with the air inlet of the blower (42), the end of the outer surface of the heating box (44) close to the blower (42) penetrates the air inlet pipe (45), and the air inlet pipe (45) is communicated with the air outlet end of the blower (42) through the communication pipe (43).

6. A welded tube straightening device according to claim 5, characterized in that: The end of the outer surface of the heating box (44) away from the air inlet pipe (45) penetrates the exhaust pipe (46), the partition box (49) wraps the end of the air inlet pipe (45) and the exhaust pipe (46) in the inner cavity of the heating box (44), the arc surface of the arc-shaped air-permeable plate (410) is fixed with a supporting strip (411), the surface of the supporting strip (411) is provided with air-permeable holes, and the supporting strip (411) is used for supporting the bottom of the steel pipe, and the outer surface of the heating box (44) is provided with a plurality of exhaust holes (47) which are communicated with the inner cavity of the partition box (49).

7. A pipe straightening device as defined in claim 1 wherein: The automatic straightening mechanism (5) comprises a detection end and a straightening end, the detection end of the automatic straightening mechanism (5) is two, and the two detection ends are arranged at the two ends of the heating box (44), the detection end of the automatic straightening mechanism (5) comprises a fixed ring (51), the fixed ring (51) is fixed on the end of the heating box (44), the upper surface and the lower surface of the fixed ring (51) are both fixed with a limiting pipe (52), and the end of the limiting pipe (52) away from the fixed ring (51) is fixed with a communication box (53).

8. A pipe welding and straightening apparatus according to claim 7, wherein: The upper surface of the communication box (53) at the top penetrates an air inlet valve (54), the air inlet valve (54) is used for connecting the external compressor, the lower surface of the communication box (53) at the bottom penetrates a pressure valve (55), the pressure valve (55) is used for detecting the size of the air pressure in the communication box (53), the inner cavity of the limiting pipe (52) is slidably connected with a piston rod (56), the end of the piston rod (56) is fixed with a spring (57), the end of the spring (57) is fixed on the inner wall of the limiting pipe (52), the end of the piston rod (56) away from the spring (57) is fixed with an arc-shaped plate (58), the arc-shaped plate (58) is located in the inner cavity of the fixed ring (51), the surface of the arc-shaped plate (58) is fixed with a positioning sleeve (59), the inner wall of the positioning sleeve (59) is fixed with a fixed block (510), the outer surface of the fixed block (510) is fixed with a second rolling bearing (511), the outer ring of the second rolling bearing (511) is fixed with a rolling ball (512), and the rolling ball (512) is a rubber ball with a plurality of evenly distributed anti-skid grooves on the outer surface.

9. A pipe welding and straightening apparatus as defined in claim 8 wherein: The straightening end of the automatic straightening mechanism (5) comprises a support frame (513) fixed on the outer surface of the heating box (44), the top end of the support frame (513) is fixedly connected with an oil cylinder (514), the movable end of the oil cylinder (514) is fixedly provided with an extrusion rod (515), the bottom end of the extrusion rod (515) is fixedly provided with an extrusion block (516), the lower surface of the extrusion block (516) is fixedly provided with a rubber pad (517), and the extrusion block (516) is movably connected at the square hole (48) formed on the upper surface of the heating box (44).

10. A method of using a welded tube straightening device, characterized by The pipe straightening device according to any one of claims 1 to 9, comprising the following steps: Step one: place the welded steel pipe to be straightened horizontally on the arc-shaped air permeable plate (410) inside the heating box (44), with one end of the steel pipe extending into the pushing mechanism (3), complete the preliminary clamping, start the pushing mechanism (3), drive the steel pipe to rotate at low speed, and move horizontally at the same time, so as to push the steel pipe into the inner cavity of the heating box (44) and the automatic straightening mechanism (5) at both ends stably and coaxially, until the front end of the steel pipe reaches the predetermined straightening station; Step two: after the steel pipe is positioned, start the detection end of the automatic straightening mechanism (5), since the steel pipe is bent, the gap between the outer wall and the automatic straightening mechanism (5) will change when the steel pipe rotates, causing the air pressure inside the automatic straightening mechanism (5) to fluctuate, the sensor inside the automatic straightening mechanism (5) monitors and records the air pressure change data in real time, and sends the data to the central processor, the central processor analyzes the air pressure time sequence data of each detection point, calculates the bending curvature of the steel pipe, the circumferential angle and the specific position along the axial direction of the maximum bending point, and completes the accurate positioning of the bending point; Step three: according to the bending point position determined by the central processor, adjust the axial position of the steel pipe, so that the maximum bending point is accurately aligned with the square hole (48) area above the heating box (44), start the heating mechanism (4), hot air enters the partition box (49) through the air inlet pipe (45), and uniformly penetrates from the arc-shaped air permeable plate (410), preheats the whole steel pipe located thereon, then, hot air concentrates and flows out from the square hole (48) aligned with the bending point, and concentrates and controllably heats the bending point and the adjacent area of the steel pipe, so that the bending point and the adjacent area of the steel pipe reach a temperature suitable for plastic straightening; during the heating process, the heating temperature and range can be controlled by adjusting the power; Step four: when the bending point area reaches the predetermined straightening temperature, start the straightening end of the automatic straightening mechanism (5) to apply a vertical downward pressure to the heated steel pipe bending point, at the same time, the steel pipe keeps rotating slowly under the driving of the pushing mechanism (3), the pressure and the rotating movement of the steel pipe are combined, and multi-point and progressive pressure straightening of the bending point is realized.

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