Large-diameter elbow hydraulic pushing machine and pushing process

Abstract

The invention relates to the technical field of pipe fitting machining equipment, and discloses a large-diameter elbow hydraulic pushing machine and a pushing process, the large-diameter elbow hydraulic pushing machine comprises a pushing machine body, a discharging plate mounted at the front end of a guide rail of the pushing machine body, and a mounting part mounted on the discharging plate and used for mounting a compensation tool, a deviation rectifying tool and a medium-frequency induction heating device; the compensation part is installed in the installation part, real-time pressure compensation is carried out according to straight pipes with different calibers during pushing, the adjusting part is installed on the compensation part, pressure compensation can be carried out on pipes with different calibers in real time through the design of the compensation part, and the compensation part comprises a U-shaped plate, a sliding rod, a limiting piece, a first tension spring, a first U-shaped frame and a guide roller. The guide roller on the front side is used for supporting a straight pipe to deform, the guide roller is pushed to be attached to the pipe all the time through the tension of the first tension spring, the deformation bending track is compensated through elasticity, the problems of dislocation bending, excessive bending and rotating shaking of the pipe are solved, and the stability of the pipe conveying process is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of pipe fitting processing equipment, in particular to a large-diameter elbow hydraulic pushing machine and a pushing process. Background Art

[0002] In modern industrial piping systems, elbows are an indispensable pipe fitting used to change the direction of the pipeline to meet the needs of various complex pipeline layouts. With the continuous development of industry, especially in large-scale engineering fields such as petroleum, chemical, electric power, and natural gas transportation, the demand for large-diameter elbows is growing.

[0003] Traditional elbow manufacturing processes mainly include stamping elbows, welding elbows and push elbow processes. The push elbow process utilizes the plastic deformation characteristics of metal materials at high temperatures. After the straight tube blank is heated, it is gradually bent and deformed through a pushing device to form an elbow. In terms of providing the pushing force, the pushing machine adopts a mechanical transmission method, such as a screw nut mechanism or a gear rack mechanism to transmit the pushing force. In terms of heating methods, existing pushing machines use flame heating or resistance heating.

[0004] In actual applications, after the pusher pushes the straight tube into the induction coil, the straight tube is deformed by heat and falls into a bent shape. In the process of bending the straight tube, the friction during pushing and the friction between the tube wall and the mold easily cause the straight tube to rotate, which further causes the straight tube to not fall vertically when it is bent by heat, but to deviate to a certain extent. This causes the tensile stress on the outer side of the tube wall to be concentrated on the side of the bent tube wall, affecting the uniformity and quality of the finished bent tube. At the same time, the bent tube falls directly on the receiving plate in a heated state, and the impact force will also cause deformation and wear on the surface of the bent tube, especially for large-diameter bent tubes, where the deformation caused by the impact is more obvious. Therefore, a large-diameter elbow hydraulic pusher and a pusher process are proposed to solve the above-mentioned problems. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a large-diameter elbow hydraulic pushing machine and pushing process, which solves the problem that the friction force when pushing the straight pipe easily causes spinning, causing stress offset in the elbow forming process, and the impact force generated by the elbow falling in a heated state easily causes pipe wall deformation.

[0006] (II) Technical solution To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a large-diameter elbow hydraulic pushing machine, comprising a pushing machine body, a discharge plate installed on the front end of the guide rail of the pushing machine body, a mounting part installed on the discharge plate, and used to install a compensation tool, a correction tool and a medium-frequency induction heating device, the compensation part is installed in the mounting part, and real-time pressure compensation is performed when pushing straight pipes of different diameters, the adjustment part is installed on the compensation part, and adaptive adjustment is performed according to straight pipes of different diameters, the correction part is installed on the adjustment part, and the stress direction of the heated straight pipe when it is bent is corrected, and the material withdrawal part is installed on the front side of the adjustment part to reduce the impact force when the bent pipe falls off and to support the unloading.

[0007] Preferably, the mounting portion includes two support plates, the front ends of the two support plates are fixedly connected to the sides away from each other with hinged plates, the rear ends of the two support plates are fixedly connected to mounting plates, and the two mounting plates are provided with mounting holes.

[0008] Preferably, the compensation part includes a U-shaped plate, the top of the U-shaped plate is movably penetrated by two sliding rods, the bottom ends of the two sliding rods are fixedly connected to limiting plates, a tension spring is fixedly connected between each limiting plate and the top of the inner wall of the U-shaped plate, the top ends of the two sliding rods are fixedly connected to a U-shaped frame, and a guide roller is rotatably connected between the two ear ends of the U-shaped frame.

[0009] Preferably, there are two compensating parts, a U-shaped plate of one compensating part is fixedly connected between the front ends of the two support plates, and another U-shaped plate of the compensating part is fixedly connected between the rear ends of the U-shaped plates.

[0010] Preferably, the adjusting part includes a mounting plate, a side of the mounting plate close to the discharge plate is rotatably connected to a screw, an end of the screw away from the discharge plate is fixedly connected to a handwheel, an adjusting plate is threadedly sleeved on the screw, two connecting plates are symmetrically installed on the adjusting plate, the bottom of the two connecting plates are hinged with arm 1, the ends of the two arm 1s away from the connecting plates are hinged with arm 2, the two arm 1s are symmetrically arranged with each other, and the two arm 2s are symmetrically arranged with each other.

[0011] Preferably, the deviation correction part includes a right-angle rod, the outer wall of the right-angle rod is fixedly connected to a support rod, the support rod is tilted, the end of the right-angle rod is fixedly connected to a U-shaped frame 2, and a roller is rotatably connected between the two ear ends of the U-shaped frame 2.

[0012] Preferably, there are two deviation-correcting parts, the bottom ends of the two right-angle rods in the two deviation-correcting parts are respectively fixedly connected to the tops of the two support arms II, and the bottom ends of the two support rods are respectively fixedly connected to the tops of the two support arms II.

[0013] Preferably, the material withdrawal portion includes a limiting frame, the inner walls of the limiting frame are rotatably connected with a rotating rod via a torsion spring, the outer wall of the rotating rod is fixedly connected with a connecting arm 1, the front end of the connecting arm 1 is fixedly connected with two discs, a connecting arm 2 is hinged between the two discs, the top end of the connecting arm 2 is fixedly connected with a supporting plate, and a tension spring 2 is elastically connected between the connecting arm 1 and the connecting arm 2.

[0014] Preferably, the two mounting plates are installed at the bottom of the front side of the discharge plate, a U-shaped discharge port is provided on the discharge plate, the U-shaped plates at the rear ends of the two support plates are attached to the discharge plate, the mounting plate is fixedly connected to the top of the inner wall of the U-shaped plate at the front ends of the two support plates, the front ends of the two support arms are respectively hinged to the two hinge plates, the limiting frame is fixedly connected to the bottom of the front side of the mounting plate, the top of the connecting arm one is abutted against the top of the inner wall of the limiting frame, and the front and rear sides of the support plate are both curved structures.

[0015] A large-caliber elbow hydraulic pushing process includes the following steps: Step 1: First, select pipes that meet the standards and design requirements, perform an appearance inspection on the pipes to ensure that there are no obvious defects on the surface of the pipes, and then pre-treat and cut the pipes into short straight pipes with equal distances. The cutting length is determined according to the design curvature radius of the elbow and the pipe diameter. The two ends of the cut pipes are chamfered to reduce stress concentration during the pushing process.

[0016] Step 2: Put the cut pipes into the mandrel in turn and put them into the pusher body for pushing. The pipes enter the induction coil of the medium frequency induction heating device through the discharge port of the discharge plate. According to the material and specifications of the pipes, set the relevant parameters in the PLC and start the medium frequency power supply to heat the pipes. During the heating process, the temperature sensor monitors the temperature of the pipe in real time and feeds back the temperature signal to the PLC. The PLC adjusts the output power of the medium frequency power supply according to the feedback signal to ensure that the pipes are heated evenly and the temperature is accurately controlled within the set range.

[0017] Step 3: In the initial stage of pushing, use a lower pushing speed. As the tube is gradually pushed out and the degree of bending increases, increase the pushing speed appropriately to ensure that the pushing force is always within the tolerable range of the tube to prevent the tube from breaking. At the same time, adjust the lubrication conditions of the mandrel, die, guide roller, rotating roller and support plate according to the material and specifications of the tube. Use graphite emulsion and special high-temperature lubricant for lubrication to reduce the friction between them and the tube.

[0018] Step 4: When pushing large-diameter elbows of different specifications and materials, the compensation part is used to provide pressure compensation to prevent the pipe from rotating and shaking, the correction part corrects the falling direction of the pipe deformed by heating, and the unloading part lifts the deformed elbow and presses down the supporting plate through the weight of the elbow to stretch it, so as to stably unload the elbow, and perform regular inspection and maintenance to ensure the integrity and effectiveness of the lubricating coating.

[0019] Step 5: After the elbow is pushed, it is cooled and shaped in the cooling system. After cooling, the elbow is inspected for appearance and measured for size. The inspection content includes the surface quality, wall thickness uniformity, and ovality of the elbow. Qualified elbows are marked and packaged, and unqualified elbows are classified and processed.

[0020] (III) Beneficial effects Compared with the prior art, the present invention provides a large-caliber elbow hydraulic pushing machine and pushing process, which has the following beneficial effects: 1. The large-diameter elbow hydraulic pushing machine and pushing process adopts the design of the compensation part to compensate the pressure of pipes of different diameters in real time. The compensation part includes a U-shaped plate, a slide bar, a limit plate, a tension spring 1, a U-shaped frame 1 and a guide roller. The guide roller on the front side is used to support the straight pipe for deformation. The tension of the tension spring 1 pushes the guide roller to always fit the pipe. The elasticity is used to compensate for the deformation and bending trajectory to avoid the problems of misaligned bending, excessive bending and rotational shaking of the pipe, thereby ensuring the stability of the pipe transportation process.

[0021] 2. The large-diameter elbow hydraulic pushing machine and pushing process adopts an adjustment part that can be adapted and adjusted according to straight pipes of different diameters. The adjustment part consists of a mounting plate, a screw, a handwheel, an adjustment plate, a connecting piece, arm one and arm two, etc. The screw is rotated by turning the handwheel to displace the adjustment plate, thereby driving arm one and arm two to move in a curve, thereby synchronously adjusting the interval between the two correcting parts to match the diameters of different pipes and ensure that the correcting part can work effectively.

[0022] 3. The large-diameter elbow hydraulic pushing machine and pushing process adopts a correction part to correct the stress direction of the heated straight pipe when it is bent. The correction part includes a right-angle rod, a support rod, a U-shaped frame and two rollers. When the pipe is deformed and bent, it is always limited by the rollers of the correction part on both sides, and will not cause rotation or skew problems, effectively avoiding the dislocation of the bending stress of the pipe, further improving the bending quality of the pipe, ensuring the vertical drop of the bent pipe, and improving the stability of material feeding.

[0023] 4. The large-diameter elbow hydraulic pushing machine and pushing process adopts a material-removing part to reduce the impact force when the elbow falls off and lift the material. The material-removing part is composed of a limiting frame, a rotating rod, a connecting arm one, a disc, a connecting arm two, a supporting plate and a tension spring two. After the elbow is heated and formed, it falls on the supporting plate, pressing the supporting plate to extend its curve. When the front arc surface of the supporting plate contacts the ground, it is in an inclined state and the elbow is ejected for material removal. After the elbow moves away, the rotating rod is reset by the torsion force of the torsion spring, and the tension spring two pulls the connecting arm two to reset. The supporting plate follows the reset and waits for the next lifting, which effectively avoids the problem of wear and deformation caused by excessive impact when unloading large-diameter elbows. At the same time, the rear arc surface reduces friction when receiving the elbow and avoids scratching the elbow.

[0024] 5. The large-diameter elbow hydraulic pushing machine and pushing process adopts precise control of the pipe heating process. The cut pipe is placed in the pushing machine body and pushed into the induction coil of the medium-frequency induction heating device. The relevant parameters are set in the PLC according to the pipe material and specifications and the medium-frequency power supply is started for heating. During the heating process, the temperature sensor monitors the pipe temperature in real time. The PLC adjusts the output power of the medium-frequency power supply according to the feedback signal to ensure that the pipe is heated evenly and the temperature is accurately controlled within the set range, which is beneficial to improve the quality of the elbow.

[0025] 6. The large-diameter elbow hydraulic pushing machine and pushing process adopts reasonable control of the pushing speed and optimization of lubrication conditions during the pushing process. A lower pushing speed is adopted in the initial stage of pushing, and the speed is appropriately increased as the bending degree of the pipe increases to ensure that the pushing force is within the tolerable range of the pipe to prevent rupture. At the same time, the lubrication conditions of the mandrel, mold, guide roller, rotating roller and supporting plate are adjusted according to the material and specifications of the pipe. Graphite emulsion and special high-temperature lubricant are used for lubrication to reduce the friction between them and the pipe, which helps to improve the stability of the pushing process and the quality of elbow forming.

[0026] 7. The large-diameter elbow hydraulic pushing machine and pushing process adopts comprehensive quality inspection and processing of the elbow after pushing. After cooling and finalizing, the elbow is inspected for appearance and measured for size, including surface quality, wall thickness uniformity, ovality, etc. Qualified elbows are marked and packaged, and unqualified elbows are classified and processed, which ensures product quality and facilitates subsequent use and management. Through the entire pushing process, the manufacturing quality and production efficiency of large-diameter elbows can be effectively improved to meet the high performance and high reliability requirements of industrial piping systems for large-diameter elbows. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a front axial view of a large-caliber elbow hydraulic push-making machine proposed by the present invention; Figure 2 This is a rear axial view of a large-caliber elbow hydraulic push-making machine proposed by the present invention; Figure 3This is a connection diagram of a discharge plate and a mounting portion of a large-caliber elbow hydraulic push-making machine proposed by the present invention; Figure 4 This is a schematic diagram of the structure of the compensation part of a large-caliber elbow hydraulic push-making machine proposed by the present invention; Figure 5 This is a schematic diagram of the structure of the adjustment part of a large-caliber elbow hydraulic push-making machine proposed by the present invention; Figure 6 This is a structural schematic diagram of a deviation-correcting part of a large-caliber elbow hydraulic push-making machine proposed by the present invention; Figure 7 This is a top axial view of the material removal part of a large-caliber elbow hydraulic push-making machine proposed by the present invention; Figure 8 The present invention provides a bottom axial view of the material removal portion of a large-diameter elbow hydraulic push-making machine.

[0028] In the figure: 1. Push machine body; 2. Discharging plate; 3. Mounting part; 31. Support plate; 32. Hinge plate; 33. Mounting plate; 4. Compensation part; 41. U-shaped plate; 42. Slide rod; 43. Limiting plate; 44. Tension spring 1; 45. U-shaped frame 1; 46. Guide roller; 5. Adjustment part; 51. Mounting plate; 52. Screw rod; 53. Hand wheel; 54. Adjustment plate; 55. Connecting plate; 56. Support arm 1; 57. Support arm 2; 6. Correction part; 61. Right-angle rod; 62. Support rod; 63. U-shaped frame 2; 64. Roller; 7. Material withdrawal part; 71. Limiting frame; 72. Rotating rod; 73. Connecting arm 1; 74. Disc; 75. Connecting arm 2; 76. Support plate; 77. Tension spring 2. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-8The present invention provides a technical solution: a large-diameter elbow hydraulic pushing machine, including a pushing machine body 1, the pushing machine body 1 is an elbow pushing machine, a special equipment for pushing straight pipe materials into elbow shapes, the discharge plate 2 of this case is installed at the front end of the guide rail of the pushing machine body 1, the mounting part 3 of this case is installed on the discharge plate 2, and is used to install compensation tools, correction tools and medium-frequency induction heating devices, the compensation part 4 of this case is installed in the mounting part 3, and real-time pressure compensation is performed when pushing straight pipes of different diameters, the adjustment part 5 of this case is installed on the compensation part 4, and adaptive adjustment is performed according to straight pipes of different diameters, the correction part 6 of this case is installed on the adjustment part 5, and the stress direction of the heated straight pipe when it is bent is corrected, and the material withdrawal part 7 is installed on the front side of the adjustment part 5 to reduce the impact force when the bent pipe falls off and to support the unloading.

[0031] In the present invention, in order to better install the compensation tool, correction tool and medium frequency induction heating device involved in this case, the installation part 3 of this case includes two support plates 31, the medium frequency induction heating device is installed on the outside of the support plate 31 and the induction coil is centrally arranged above the two support plates 31, and the two support plates 31 are fixedly connected to the sides away from each other at the front ends thereof with hinged plates 32, and the two support plates 31 are fixedly connected to the rear ends with mounting plates 33, and mounting holes are provided on the two mounting plates 33.

[0032] In order to perform pressure compensation for pipes of different calibers in real time and ensure the stability of pipe transportation, the compensation part 4 in this case includes a U-shaped plate 41. Two sliding rods 42 are movably penetrated through the top of the U-shaped plate 41. The bottom ends of the two sliding rods 42 are fixedly connected to a limiting plate 43. A tension spring 44 is fixedly connected between each limiting plate 43 and the top of the inner wall of the U-shaped plate 41. The top ends of the two sliding rods 42 are fixedly connected to a U-shaped frame 45. A guide roller 46 is rotatably connected between the two ear ends of the U-shaped frame 45. The pipe is pushed by fitting the guide roller 46. There are two compensation parts 4. The U-shaped plate 41 of one compensation part 4 is fixedly connected between the front ends of the two support plates 31, and the U-shaped plate 41 of the other compensation part 4 is fixedly connected between the rear ends of the U-shaped plate 41. The front guide roller 46 is used to support the straight pipe for deformation, and utilizes elasticity to compensate for the trajectory of deformation bending to avoid the problems of misaligned bending and excessive bending of the pipe.

[0033] In this embodiment, an adjustable manner is utilized to match the calibers of different pipes, so that the deviation correction part 6 can match the caliber of the pipe for correction work. The adjusting part 5 in this case includes a mounting plate 51, and a screw rod 52 is rotatably connected to the side of the mounting plate 51 close to the discharge plate 2, and a hand wheel 53 is fixedly connected to the end of the screw rod 52 away from the discharge plate 2. An adjusting plate 54 is threadedly sleeved on the screw rod 52, and two connecting plates 55 are symmetrically mounted on the adjusting plate 54. The bottoms of the two connecting plates 55 are hinged with a support arm 1 56, and the ends of the two support arms 1 56 away from the connecting plate 55 are hinged with a support arm 2 57. The two support arms 1 56 are symmetrically arranged with each other, and the two support arms 2 57 are symmetrically arranged with each other. The adjustment plate 54 is displaced on the screw rod 52 to cause the support arms 1 56 and the support arms 2 57 to move in a curve, thereby synchronously adjusting the interval between the two deviation correction parts 6.

[0034] In order to further improve the bending quality of the pipe and avoid the problem of misalignment of the bending stress of the pipe, the correcting part 6 in this case includes a right-angle rod 61, and the outer wall of the right-angle rod 61 is fixedly connected to a support rod 62, and the support rod 62 is tilted. The end of the right-angle rod 61 is fixedly connected to a U-shaped frame 63, and a roller 64 is rotatably connected between the two ear ends of the U-shaped frame 63. There are two correcting parts 6. After the pipe is deformed and bent, it is always limited by the rollers 64 of the correcting parts 6 on both sides, and there will be no rotation or skewing problems. The bottom ends of the two right-angle rods 61 in the two correcting parts 6 are respectively fixedly connected to the tops of the two support arms 57, and the bottom ends of the two support rods 62 are respectively fixedly connected to the tops of the two support arms 57.

[0035] It is worth noting that in order to avoid the problem of wear and deformation caused by excessive impact when cutting large-diameter elbows, the material withdrawal part 7 in this case includes a limiting frame 71, and a rotating rod 72 is rotatably connected between the inner walls of the limiting frame 71 through a torsion spring, and the outer wall of the rotating rod 72 is fixedly connected to a connecting arm 1 73, and the front end of the connecting arm 1 73 is fixedly connected to two discs 74, and a connecting arm 2 75 is hinged between the two discs 74, and the top of the connecting arm 2 75 is fixedly connected to a supporting plate 76, and a tension spring 2 77 is elastically connected between the connecting arm 1 73 and the connecting arm 2 75.

[0036] It is worth mentioning that the two mounting plates 33 are mounted on the front bottom of the discharge plate 2, a U-shaped discharge port is opened on the discharge plate 2, the U-shaped plate 41 at the rear end of the two support plates 31 is attached to the discharge plate 2, the mounting plate 51 is fixedly connected to the top of the inner wall of the U-shaped plate 41 at the front end of the two support plates 31, the front ends of the two support arms 57 are hinged to the two hinge plates 32 respectively, the limiting frame 71 is fixedly connected to the front bottom of the mounting plate 51, the top of the connecting arm 73 is abutted against the top of the inner wall of the limiting frame 71, the front and rear sides of the supporting plate 76 are both arc surface structures, the front arc surface buffers the force of the supporting plate 76 hitting the ground, and the rear arc surface reduces friction when receiving the elbow and avoids scratching the elbow.

[0037] A large-caliber elbow hydraulic pushing process includes the following steps: Step 1: First, select pipes that meet the standards and design requirements, perform an appearance inspection on the pipes to ensure that there are no obvious defects on the surface of the pipes, and then pre-treat and cut the pipes into short straight pipes with equal distances. The cutting length is determined according to the design curvature radius of the elbow and the pipe diameter. The two ends of the cut pipes are chamfered to reduce stress concentration during the pushing process.

[0038] Step 2: The cut pipes are sequentially inserted into the mandrel and placed into the pusher body 1 for pushing. The pipes enter the induction coil of the medium frequency induction heating device through the discharge port of the discharge plate 2. According to the material and specifications of the pipes, the relevant parameters are set in the PLC and the medium frequency power supply is started to heat the pipes. During the heating process, the temperature sensor monitors the temperature of the pipe in real time and feeds back the temperature signal to the PLC. The PLC adjusts the output power of the medium frequency power supply according to the feedback signal to ensure that the pipes are heated evenly and the temperature is accurately controlled within the set range.

[0039] Step 3: In the initial stage of pushing, a lower pushing speed is used. As the tube is gradually pushed out and the bending degree increases, the pushing speed is appropriately increased to ensure that the pushing force is always within the tolerable range of the tube to prevent the tube from breaking. At the same time, according to the material and specifications of the tube, the lubrication conditions of the mandrel, die, guide roller 46, rotating roller 64 and support plate 76 are adjusted. Graphite emulsion and special high-temperature lubricant are used for lubrication to reduce the friction between them and the tube.

[0040] Step 4: When pushing large-diameter elbows of different specifications and materials, the compensation part 4 is used to provide pressure compensation to prevent the pipe from rotating and shaking, the correction part 6 corrects the falling direction of the pipe deformed by heating, and the unloading part 7 lifts the deformed bent pipe and presses down the supporting plate 76 through the deadweight of the bent pipe to stretch it, so as to stably unload the bent pipe, and perform regular inspection and maintenance to ensure the integrity and effectiveness of the lubricating coating.

[0041] Step 5: After the elbow is pushed, it is cooled and shaped in the cooling system. After cooling, the elbow is inspected for appearance and measured for size. The inspection content includes the surface quality, wall thickness uniformity, and ovality of the elbow. Qualified elbows are marked and packaged, and unqualified elbows are classified and processed.

[0042] Working principle: the cut pipe is pushed to the discharge hole of the discharge plate 2 through the pusher body 1. The induction coil is located between the two guide rollers 46. The pipe fits the guide roller 46 in front of the discharge plate 2 for pressure compensation. The guide roller 46 is pushed to always fit the pipe by the tension of the tension spring 44 to prevent the pipe from spinning and shaking. After the pipe enters the induction coil and is heated, it is pushed out from the other guide roller 46. The pipe fits the other guide roller 46 to bend and deform until it falls.

[0043] The hand wheel 53 is used to drive the screw rod 52 to rotate, causing the adjustment plate 54 to move, thereby causing the connecting piece 55 to drive the support arm 1 56 and the support arm 2 57 to move in a synchronous curve under a hinged state, and then drive the two right-angle rods 61 to move closer to or away from each other, so as to adjust the distance between the two rollers 64 and match the current diameter size of the pipe. When the pipe is heated and bent and enters between the two rollers 64, the bent pipe is limited and corrected by the rollers 64 to prevent the pipe from tilting and rotating, further improve the stability of material discharge, and ensure that the bent pipe falls vertically.

[0044] After the bent pipe is heated and formed, it will automatically fall onto the supporting plate 76, thereby pressing the supporting plate 76 to extend the curve. When the front arc surface of the supporting plate 76 touches the ground, the supporting plate 76 is tilted to pop out the bent pipe for material withdrawal. After the bent pipe is away, the torsion force of the torsion spring resets the rotating rod 72, and prompts the connecting arm 1 73 to flip upward and re-abut the limiting frame 71, thereby avoiding excessive flipping of the connecting arm 1 73 to cause accidental contact of parts. The tension spring 2 77 pulls the connecting arm 2 75 to reset and re-position it under the next bent pipe, and the supporting plate 76 follows the reset and waits for the next lift.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A large-caliber elbow hydraulic push-making machine, characterized in that: include: Pushing machine body (1); A discharge plate (2) is mounted on the front end of the guide rail of the pusher body (1); A mounting portion (3) mounted on the discharge plate (2) and used for mounting a compensation tool, a deviation correction tool and a medium frequency induction heating device; A compensation part (4) is installed in the installation part (3) and performs real-time pressure compensation when straight pipes of different diameters are pushed; An adjusting portion (5) is mounted on the compensating portion (4) and is adapted to be adjusted according to straight pipes of different diameters; A deviation correction part (6) is installed on the adjustment part (5) to correct the stress direction when the heated straight pipe is bent; The material withdrawal portion (7) is installed on the front side of the adjusting portion (5) to reduce the impact force when the bent pipe falls off and to support the material.

2. A large-caliber elbow hydraulic push-making machine according to claim 1, characterized in that: The mounting portion (3) comprises two support plates (31), the front ends of the two support plates (31) being fixedly connected to a hinged plate (32) on one side away from each other, the rear ends of the two support plates (31) being fixedly connected to a mounting plate (33), and the two mounting plates (33) being provided with mounting holes.

3. A large-caliber elbow hydraulic push-making machine according to claim 2, characterized in that: The compensation part (4) comprises a U-shaped plate (41), the top of the U-shaped plate (41) is movably penetrated by two sliding rods (42), the bottom ends of the two sliding rods (42) are fixedly connected to a limiting plate (43), a tension spring (44) is fixedly connected between each limiting plate (43) and the top of the inner wall of the U-shaped plate (41), the top ends of the two sliding rods (42) are fixedly connected to a U-shaped frame (45), and a guide roller (46) is rotatably connected between two ear ends of the U-shaped frame (45); There are two compensation parts (4), one U-shaped plate (41) of the compensation part (4) is fixedly connected between the front ends of the two support plates (31), and the other U-shaped plate (41) of the compensation part (4) is fixedly connected between the rear ends of the U-shaped plates (41); The adjusting portion (5) comprises a mounting plate (51), a screw rod (52) being rotatably connected to a side of the mounting plate (51) close to the discharge plate (2), a hand wheel (53) being fixedly connected to one end of the screw rod (52) away from the discharge plate (2), an adjusting plate (54) being threadedly sleeved on the screw rod (52), two connecting plates (55) being symmetrically mounted on the adjusting plate (54), the bottoms of the two connecting plates (55) being hingedly connected to a support arm 1 (56), the ends of the two support arms 1 (56) away from the connection plate (55) being hingedly connected to a support arm 2 (57), the two support arms 1 (56) being symmetrically arranged with each other, and the two support arms 2 (57) being symmetrically arranged with each other; The deviation correcting portion (6) comprises a right-angle rod (61), the outer wall of the right-angle rod (61) is fixedly connected to a support rod (62), the support rod (62) is arranged obliquely, the end of the right-angle rod (61) is fixedly connected to a second U-shaped frame (63), and a roller (64) is rotatably connected between two ear ends of the second U-shaped frame (63); There are two deviation-correcting parts (6), the bottom ends of the two right-angle rods (61) in the two deviation-correcting parts (6) are respectively fixedly connected to the tops of the two second support arms (57), and the bottom ends of the two support rods (62) are respectively fixedly connected to the tops of the two second support arms (57).

4. A large-caliber elbow hydraulic push-making machine according to claim 3, characterized in that: The material withdrawal portion (7) comprises a limiting frame (71), the inner wall of the limiting frame (71) is rotatably connected to a rotating rod (72) via a torsion spring, the outer wall of the rotating rod (72) is fixedly connected to a connecting arm 1 (73), the front end of the connecting arm 1 (73) is fixedly connected to two discs (74), a connecting arm 2 (75) is hinged between the two discs (74), the top end of the connecting arm 2 (75) is fixedly connected to a supporting plate (76), and a tension spring 2 (77) is elastically connected between the connecting arm 1 (73) and the connecting arm 2 (75).

5. The large-caliber elbow hydraulic pushing machine according to claim 4, characterized in that: The two mounting plates (33) are mounted on the front bottom of the discharge plate (2); a U-shaped discharge port is provided on the discharge plate (2); the U-shaped plates (41) at the rear ends of the two support plates (31) are fitted on the discharge plate (2); the mounting plate (51) is fixedly connected to the top of the inner wall of the U-shaped plates (41) at the front ends of the two support plates (31); the front ends of the two support arms (57) are respectively hinged to the two hinge plates (32); the limiting frame (71) is fixedly connected to the front bottom of the mounting plate (51); the top of the connecting arm (73) is abutted against the top of the inner wall of the limiting frame (71); and the front and rear sides of the support plate (76) are both arc structures.

6. A large-diameter elbow hydraulic pushing machine pushing process, according to the large-diameter elbow hydraulic pushing machine according to claim 5, characterized in that: The following steps are involved: Step 1: First, select pipes that meet the standards and design requirements, conduct an appearance inspection on the pipes to ensure that there are no obvious defects on the surface of the pipes, and then pre-treat and cut the pipes into short straight pipes with equal distances. The cutting length is determined according to the design curvature radius of the elbow and the pipe diameter. The two ends of the cut pipes are chamfered to reduce stress concentration during the pushing process; Step 2: The cut pipes are sequentially inserted into the mandrel and placed into the pusher body (1) for pushing. The pipes enter the induction coil of the medium frequency induction heating device through the discharge port of the discharge plate (2). According to the material and specification of the pipes, relevant parameters are set in the PLC and the medium frequency power supply is started to heat the pipes. During the heating process, the temperature sensor monitors the temperature of the pipe in real time and feeds back the temperature signal to the PLC. The PLC adjusts the output power of the medium frequency power supply according to the feedback signal to ensure that the pipes are heated evenly and the temperature is accurately controlled within the set range. Step 3: In the initial stage of pushing, a relatively low pushing speed is used. As the tube is gradually pushed out and the bending degree increases, the pushing speed is appropriately increased to ensure that the pushing force is always within the tolerable range of the tube to prevent the tube from breaking. At the same time, the lubrication conditions of the mandrel, the die, the guide roller (46), the rotating roller (64) and the support plate (76) are adjusted according to the material and specification of the tube. Graphite emulsion and a special high-temperature lubricant are used for lubrication to reduce the friction between them and the tube; Step 4: When pushing large-diameter elbows of different specifications and materials, the compensation part (4) is used to provide pressure compensation to prevent the pipe from rotating and shaking, the deviation correction part (6) corrects the falling direction of the pipe deformed by heating, and the unloading part (7) lifts the deformed bent pipe and presses down the supporting plate (76) through the deadweight of the bent pipe to stretch it, so as to stably unload the bent pipe, and regularly perform inspection and maintenance to ensure the integrity and effectiveness of the lubricating coating; Step 5: After the elbow is pushed, it is cooled and shaped in the cooling system. After cooling, the elbow is inspected for appearance and measured for size. The inspection content includes the surface quality, wall thickness uniformity, and ovality of the elbow. Qualified elbows are marked and packaged, and unqualified elbows are classified and processed.

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