A heat treatment line for pipes

Abstract

The invention discloses a heat treatment line for pipes, comprising a frame, a feeding device with evenly distributed inclined guide wheels, a quenching device, a quenching cooling device, a tempering device, a tempering cooling device and a guide cutting device, a plurality of inclined guide wheels are driven to rotate by a rotating power member 1, the pipe located on the inclined guide wheel moves along the axial direction and rotates around the axial direction, the quenching device comprises an induction heating machine arranged in the middle, and guide members arranged at both ends, a power member is arranged between the induction heating machine and the guide member, a plurality of slewing support bearings are arranged on the frame, the plurality of slewing support bearings are connected to a rotating power member 2, the power member and the guide member are connected to the slewing support bearing through a base ring, the power member comprises a first roller group clamped on the outer periphery of the pipe, a rotating motor is connected to the first roller group to drive it to rotate, and the rotating power member 2 drives the first roller group to rotate around the pipe. The whole process is automated, mechanized, and controlled with high precision, thereby improving the quality of the pipe.

Description

Technical Field

[0001] The invention relates to a heat treatment line in industrial processing, in particular to a heat treatment line for pipes. Background Art

[0002] For seamless steel pipes, annealing, normalizing, quenching, tempering, etc. are usually used for heat treatment to obtain the required properties. Quenching is a heat treatment process in which the seamless steel pipe is heated to a given temperature above the phase transition temperature and then rapidly cooled, in order to obtain martensite so that the required mechanical properties can be obtained after tempering at an appropriate temperature; tempering is a heat treatment process in which the seamless steel pipe is heated to a temperature below the austenite to pearlite transition temperature and then slowly cooled to room temperature, in order to obtain the required structure and properties of the seamless steel pipe; in order to obtain a certain strength and toughness, quenching and high-temperature tempering are combined, which is called a quenching and tempering heat treatment process.

[0003] The existing tempering is carried out on a continuous step heat treatment production line including a quenching furnace and a tempering furnace. The pipes are input into or output from the quenching furnace and the tempering furnace through a simple mechanical structure. There is no good control over the details of the entire processing process, resulting in uneven processing quality and low production efficiency. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a heat treatment line for pipes, the whole process of which is automated, mechanized and controlled with high precision, thereby improving the quality of the pipes.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a heat treatment line for pipes, including a frame, a feeding device evenly provided with inclined guide wheels, a quenching device, a quenching cooling device, a tempering device, a tempering cooling device and a guide cutting device. A plurality of inclined guide wheels are driven to rotate by a rotating power member 1, and the pipe located on the inclined guide wheel moves along the axial direction and rotates around the axial direction. The quenching device includes an induction heating machine arranged in the middle and guide members arranged at both ends. A power member is arranged between the induction heating machine and the guide member. A plurality of slewing support bearings are arranged on the frame. The plurality of slewing support bearings are connected to a rotating power member 2. The power member and the guide member are both connected to the slewing support bearing through a base ring. The power member includes a first roller group clamped on the outer periphery of the pipe. The rotating motor is connected to the first roller group to drive it to rotate. The rotating power member 2 drives the first roller group to rotate around the pipe.

[0006] A further preferred embodiment of the present invention is as follows: the slewing support bearing comprises an inner wheel and an outer wheel, the inner wheel is fixedly mounted on the frame, the outer circumference of the outer wheel is covered with gear teeth and is connected to the power unit, the base ring is connected to the outer wheel, and the power unit will drive the base ring to rotate through the outer wheel when it is working.

[0007] A further preferred solution of the present invention is as follows: the first roller group is movably mounted on the base ring, the distance between the first roller groups is adjustable, the pipe passes through the first roller groups, the guide member includes four second rollers that are adjustable and arranged on the base ring, the second rollers can move along the diameter direction where they are located, and the pipe passes through the middle of the four second rollers. The second rollers can rotate around their central axis, and the four second rollers are distributed in the four directions of the base ring through hole, up, down, left, and right.

[0008] A further preferred embodiment of the present invention is as follows: a reducer corresponding to the bevel guide wheel is arranged on one side thereof, and the reducers are all connected to a rotating power component 1. A rotating shaft extends from one side of the reducer, and the rotating shaft is connected to the bevel guide wheel through a joint component. The rotating power component 1 drives the rotating shaft of the reducer to rotate synchronously, and the synchronously rotating rotating shaft drives the bevel guide wheel to rotate synchronously through the joint component.

[0009] A further preferred embodiment of the present invention: the inclined guide wheel includes a shaft and a third roller sleeved on the outer circumference of the shaft, the shaft is located in a horizontal plane and has an angle with the width direction of the frame, one end of the joint is movably connected to the rotating shaft, the joint can rotate around the vertical direction located at one end thereof, the joint can rotate around the axial direction perpendicular to the vertical direction of the rotating shaft, the other end of the joint is movably connected to the shaft, the joint can rotate around the vertical direction located at the other end thereof, the joint can rotate around the axial direction perpendicular to the vertical direction of the shaft.

[0010] A further preferred solution of the present invention is as follows: with the width direction of the frame as the left and right direction, the loading device is divided into a stacking area, a guide area and a conveying area from left to right, an upper lifting plate is arranged at the bottom of the stacking area, the upper lifting plate is arranged obliquely and connected to the power device, the power device drives the upper lifting plate to move up and down, the guide area is obliquely provided with a guide plate and a limit plate above the guide plate, the distance between the limit plate and the guide plate is only enough for one pipe to pass, the conveying area is regularly arranged with multiple oblique guide wheels, the pipes passing through the guide area fall onto multiple rollers in a direction parallel to the length direction of the frame, the shaft drives the rollers to rotate, and the rotating rollers drive the pipes to rotate around the axis and move along the axial direction. .

[0011] A further preferred embodiment of the present invention is as follows: the quenching cooling device comprises a plurality of regularly arranged inclined guide wheels and an air ring, the pipe passes through the middle of the air ring, a plurality of nozzles are arranged on the surface of the air ring, the nozzles are connected to the air pump and the coolant through the air ring, and the nozzles are directly facing the surface of the pipe.

[0012] A further preferred embodiment of the present invention is as follows: the tempering device is a heating furnace, the tempering cooling device is connected behind the heating furnace, the tempering cooling device comprises a cylinder body arranged on a frame, and a plurality of regularly arranged inclined guide wheels, the cylinder body is located on the inclined guide wheels and some of the inclined guide wheels are embedded in the cylinder body, a row of nozzles are arranged along the axial direction on one side of the cylinder body, a row of through holes are provided on the top surface of the cylinder body, the nozzles are connected to the coolant and spray the coolant onto the cylinder body, some of the coolant will enter the cylinder body through the through holes, a plurality of notches are provided at the bottom of the cylinder body, some of the inclined guide wheels are embedded in the cylinder body through the notches, and the coolant entering the cylinder body is discharged through the notches.

[0013] A further preferred embodiment of the present invention is as follows: the guide cutting device comprises an inclined guide wheel arranged on the surface of the frame, and a shelf assembly arranged on the side of the frame and arranged in a row, the frame and the shelf assembly are connected through a guide assembly, a cutting assembly is arranged at the end of the shelf assembly, the cutting assembly comprises a conveying roller group and a cutting piece, the pipe passes through the middle of the conveying roller group, the conveying roller group is connected to the power device and can approach or move away from each other under the drive of the power device, when the conveying roller group is in a close state, the pipe located between the conveying roller groups is conveyed; when the conveying roller groups are far away, the pipe located between the conveying roller groups is not subjected to force.

[0014] A further preferred embodiment of the present invention is that the pipe passes through a feeding device, a quenching device, a quenching and cooling device, a tempering device, a tempering and cooling device, and a leading-out and cutting device in sequence.

[0015] Compared with the prior art, the advantages of the present invention are that firstly, inclined guide wheels are arranged on the feeding device, quenching device, quenching cooling device, tempering device, tempering cooling device and lead-out cutting device to drive the pipe to move straight and rotate around the axis, and a plurality of inclined guide wheels are driven to rotate by a rotating power member to ensure that the pipes passing through each process maintain a uniform forward speed and a uniform rotation. The plurality of inclined guide wheels involved here are driven to rotate by a rotating power member to ensure the stability of the movement of the pipe. It is preferred to adjust the rotation speed of the inclined guide wheel according to the needs of different processes, and connect the inclined guide wheels with the same rotation speed to the same rotating power member.

[0016] Secondly, a guide is provided, and the pipe to be processed will enter the induction heating machine through the guide, and the pipe that has been heated will be guided out again through the guide. The pipe of the present invention is always in a state of high stability. Then a power member is provided between the induction heating machine and the guide, and the power member includes a first roller group provided on the base ring, and the first roller group is connected to the rotating motor and clamps the pipe to drive the pipe to move straight. In addition, the power member and the guide are both connected to the slewing support bearing through the base ring, and the rotation of the slewing support bearing will drive the pipe to rotate while moving forward through the power member. The guide will also rotate synchronously and will not affect the passage of the pipe in a rotating state. The present invention cooperates with the power member and the slewing support bearing to drive the pipe to move straight and rotate, with high control accuracy, so that the pipe is heated more evenly during the whole process. So far, the entire structural setting of the present invention is more reasonable than the existing mechanical structure, and the function is more complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the quenching device of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the power part of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the inclined guide wheel of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the feeding device of the present invention;

[0023] Figure 6 is a cross-sectional view of the feeding device of the present invention;

[0024] Figure 7 It is a structural schematic diagram of the quenching cooling device of the present invention;

[0025] Figure 8 It is a structural schematic diagram of the tempering device and the tempering cooling device of the present invention;

[0026] Fig. 9 is a cross-sectional view of the tempering cooling device of the present invention;

[0027] Fig.10 It is a structural schematic diagram of the export cutting device of the present invention;

[0028] Fig.11 It is a schematic structural diagram of the cutting assembly of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] like Figures 1 to 4 As shown: a heat treatment line for pipes, including a frame 9, a feeding device 1, a quenching device 2, a quenching cooling device 3, a tempering device 4, a tempering cooling device 5 and a lead-out cutting device 6, the pipes pass through the feeding device 1, the quenching device 2, the quenching cooling device 3, the tempering device 4, the tempering cooling device 5 and the lead-out cutting device 6 in sequence. Moreover, the above devices are all provided with inclined guide wheels 7 for driving the pipes to move straight and rotate around the axis. In order to control the stability of the movement of the pipes, a plurality of inclined guide wheels 7 are driven to rotate by a rotating power member 8a. Preferably, the inclined guide wheels 7 in the same device are connected to the same rotating power member, which ensures the stability of the movement of the pipes and improves the processing performance of the products, and is more convenient for layout.

[0032] The quenching device 2 includes an induction heating machine 21 arranged in the middle, and guides arranged at both ends. A power member is arranged between the induction heating machine 21 and the guide. A plurality of slewing bearings 22 are arranged on the frame 9. The plurality of slewing bearings 22 are connected to a rotating power member 8b. The power member and the guide are connected to the slewing bearing 22 through a base ring 23. The power member includes a first roller group 24 clamped on the outer periphery of the pipe. A rotating motor 25 is connected to the first roller group 24 to drive it to rotate. The rotating power member 8b drives the first roller group 24 to rotate around the pipe. The induction heating machine 21 used in the present invention is a prior art and can be directly purchased from an equipment manufacturer.

[0033] The slewing bearing 22 includes an inner wheel and an outer wheel, the inner wheel is fixedly mounted on the frame 9, the outer wheel is covered with gear teeth on the periphery and is connected to the power device, the base ring 23 is connected to the outer wheel, and the power device drives the base ring 23 to rotate through the outer wheel. The rotating power part 8b drives multiple slewing bearings 22 to rotate synchronously, thereby ensuring that a long pipe will not get stuck when passing through, which will interfere with the entire processing process.

[0034] The first roller group 24 is movably mounted on the base ring 23. The distance between the first roller groups 24 is adjustable. The pipe passes through the first roller groups 24. The guide member includes four second rollers 27 that are adjustable and arranged on the base ring 23. The second rollers 27 can move along the diameter direction where they are located. The second rollers 27 move parallel to the base ring 23. The pipe passes through the middle of the four second rollers 27. The second roller 27 can rotate around its central axis. The four second rollers 27 are distributed in the four directions of the upper, lower, left and right of the through hole of the base ring 23. A conductive slip ring 28 is arranged between the power member and the guide member. The guide member is arranged in the present invention to ensure that the pipe can pass through the present invention smoothly and along a predetermined direction and a predetermined straight line. The structural setting of the guide member can meet the guiding function of circular pipes of different sizes, and can even achieve guidance for elliptical pipes and square pipes.

[0035] A reducer 10 corresponding to the bevel guide wheel 7 is arranged on one side thereof, and the reducers 10 are all connected to the rotating power member 8a. A rotating shaft 10a extends from one side of the reducer 10, and the rotating shaft 10a is connected to the bevel guide wheel 7 through a joint member 10b. The rotating power member 8a drives the rotating shaft 10a of the reducer 10 to rotate synchronously, and the synchronously rotating rotating shaft 10a drives the bevel guide wheel 7 to rotate synchronously through the joint member 10b. In the present invention, the synchronous rotation of the bevel guide wheel 7 is achieved by connecting multiple reducers 10 to the same rotating power member 8a.

[0036] like Figure 4 As shown: the inclined guide wheel 7 includes a shaft 7a and a third roller 7b sleeved on the outer periphery of the shaft 7a, the shaft 7a is located in a horizontal plane and has an angle with the width direction of the frame 9, one end of the joint 10b is movably connected to the rotating shaft 10a, the joint 10b can rotate around the vertical direction located at one end, and the joint 10b can rotate around the axial direction of the rotating shaft 10a perpendicular to the vertical direction, the other end of the joint 10b is movably connected to the shaft 7a, the joint 10b can rotate around the vertical direction located at the other end, and the joint 10b can rotate around the axial direction of the rotating shaft 10a perpendicular to the vertical direction. In the present invention, considering the requirement of synchronous rotation of the inclined guide wheel 7, the reducer 10 is arranged in a row. At this time, there is an angle between the rotating shaft 10a and the shaft 7a. The present invention designs the joint 10b to connect the rotating shaft 10a and the shaft 7a, and the rotating shaft 10a can drive the shaft 7a to rotate. The structure of the joint part 10b of the present invention and the setting of the connection structure make the flexibility between the shaft 7a and the rotating shaft 10a higher, thereby preventing the inclined guide wheel 7 from rotating unsmoothly.

[0037] like Figures 5 and 6As shown: with the width direction of the frame 9 as the left and right direction, the loading device 1 is divided into a stacking area, a guide area and a conveying area from left to right. An upper lifting plate 11 is arranged at the bottom of the stacking area. The upper lifting plate 11 is arranged obliquely and connected to the power device. The power device drives the upper lifting plate 11 to move up and down. The guide area is inclined with a guide plate 12 and a limit plate 13 above the guide plate 12. The spacing between the limit plate 13 and the guide plate 12 is only enough for one pipe to pass through. There are multiple inclined guide wheels 7 regularly arranged in the conveying area. The pipes passing through the guide area fall onto the inclined guide wheels 7 in a direction parallel to the length direction of the frame 9. The upper lifting plate 11 is set to lift the pipes in the stacking area upward to ensure that all pipes can enter the guide area smoothly. The limit plates 13 and guide plates 12 with a spacing that is only enough for one pipe to pass through are set in the guide area, so that the pipes can enter the guide area one by one and flow to the conveying area due to their own gravity. It should be noted that the pipes are naturally stacked in a direction perpendicular to the width direction of the frame 9, that is, the pipes are stacked parallel to the length direction of the frame 9. The pipes entering the conveying area fall onto the inclined guide wheel 7, which drives the pipes to rotate around the axis and move along the axial direction.

[0038] like Figure 7 As shown: the quenching cooling device 3 includes a plurality of regularly arranged inclined guide wheels 7 and an air ring 31, the pipe passes through the middle of the air ring 31, and a plurality of nozzles 32 are arranged on the surface of the air ring 31. The nozzles 32 are connected to the air pump and the coolant through the air ring 31, and the nozzles 32 face the surface of the pipe. Here, the coolant and the gas blown out by the air pump quickly cool the quenched pipe.

[0039] like Figures 8 to 9 As shown: the tempering device 4 is a heating furnace 41, and the tempering cooling device 5 is connected to the heating furnace 41. The tempering cooling device 5 includes a cylinder 51 arranged on a frame 9, and a plurality of regularly arranged inclined guide wheels 7. The cylinder 51 is located on the inclined guide wheels 7 and part of the inclined guide wheels 7 are embedded in the cylinder 51. A row of nozzles 52 are arranged along the axial direction of one side of the cylinder 51. A row of through holes are provided on the top surface of the cylinder 51. The nozzles 52 are connected to the coolant and spray the coolant to the cylinder 51. Part of the coolant will enter the cylinder 51 through the through holes. A plurality of notches are provided at the bottom of the cylinder 51. Part of the inclined guide wheels 7 are embedded in the cylinder 51 through the notches, and the coolant entering the cylinder 51 is discharged through the notches. The present invention designs a section of the cylinder 51 as a cooling point, the pipe is cooled in the cylinder 51, and the coolant is sprayed to the cylinder 51 through the nozzles 52 outside the cylinder 51 to cool the surface of the cylinder 51. At the same time, a row of through holes is provided on the top surface of the cylinder 51, and part of the coolant will enter the cylinder 51 through the through holes to cool the tube in the cylinder 51. The present invention realizes slow cooling of the tube and high-quality tempering by means of the structural setting of the cylinder 51 and the spraying of coolant by the nozzle 52.

[0040] like Figure 10 to Figure 11As shown, the guide cutting device 6 includes an inclined guide wheel 7 arranged on the surface of the frame 9, and a shelf assembly 61 arranged on the side of the frame 9 and arranged in a row. The frame 9 is connected to the shelf assembly 61 through a guide assembly 62. The end of the shelf assembly 61 is provided with a cutting assembly, which includes a conveying roller group 63 and a cutting piece 64. The pipe passes through the middle of the conveying roller group 63. The conveying roller group 63 is connected to the power device and can approach or move away from each other under the drive of the power device. The pipe falls on the inclined guide wheel 7, and then the guide assembly 62 guides the pipe to the shelf assembly 61. When the conveying roller group 63 is in a close state, the pipe located between the conveying roller group 63 is conveyed; when the conveying roller group 63 is in a far state, the pipe located between the conveying roller group 63 is not subjected to force. The present invention can control the movement or immobility of the pipe by the movable conveying roller group 63, instead of realizing it by the start and stop of the traditional conveying roller group 63, which effectively improves the working efficiency of cutting. The structure of the guide assembly 62 used in the lead-out cutting device 6 can be set with reference to the feeding device 1 to realize the transportation of pipes one by one.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The present invention is described in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A heat treatment line for pipes, comprising a frame, a feeding device with evenly distributed inclined guide wheels, a quenching device, a quenching cooling device, a tempering device, a tempering cooling device and a lead-out cutting device, characterized in that A plurality of inclined guide wheels are driven to rotate by a rotating power member 1, and the pipe located on the inclined guide wheel moves along the axial direction and rotates around the axial direction. The quenching device includes an induction heating machine arranged in the middle, and guide members arranged at both ends. A power member is arranged between the induction heating machine and the guide member. A plurality of slewing support bearings are arranged on the frame. The plurality of slewing support bearings are connected to a rotating power member 2. The power member and the guide member are connected to the slewing support bearing through a base ring. The power member includes a first roller group clamped on the outer periphery of the pipe. The rotating motor is connected to the first roller group to drive it to rotate. The rotating power member 2 drives the first roller group to rotate around the pipe. A reducer corresponding to the bevel guide wheel is arranged on one side thereof, and the reducers are all connected to a rotating power member 1, and a rotating shaft extends out from one side of the reducer, and the rotating shaft is connected with the bevel guide wheel through a joint member, and the rotating power member 1 drives the rotating shaft of the reducer to rotate synchronously, and the synchronously rotating rotating shaft drives the bevel guide wheel to rotate synchronously through the joint member; the bevel guide wheel comprises an axle rod and a third roller sleeved on the outer periphery of the axle rod, and the axle rod is located in a horizontal plane and has an angle with the width direction of the frame, one end of the joint member is movably connected with the rotating shaft, and the joint member can rotate around the vertical direction at one end thereof, and the joint member can rotate around the axial direction perpendicular to the vertical direction of the rotating shaft, and the other end of the joint member is movably connected with the axle rod, and the joint member can rotate around the vertical direction at the other end thereof, and the joint member can rotate around the axial direction perpendicular to the vertical direction of the axle rod; The quenching cooling device comprises a plurality of regularly arranged inclined guide wheels and an air ring, the pipe passes through the middle of the air ring, a plurality of nozzles are arranged on the surface of the air ring, the nozzles are connected to the air pump and the coolant through the air ring, and the nozzles are facing the surface of the pipe; the tempering device is a heating furnace, the tempering cooling device is connected behind the heating furnace, the tempering cooling device comprises a cylinder arranged on a frame, and a plurality of regularly arranged inclined guide wheels, the cylinder is located on the inclined guide wheel and part of the inclined guide wheel is embedded in the cylinder, a row of nozzles are arranged along the axial direction of one side of the cylinder, a row of through holes are provided on the top surface of the cylinder, the nozzles are connected to the coolant and spray the coolant onto the cylinder, part of the coolant will enter the cylinder through the through hole, the cylinder A plurality of slots are provided at the bottom of the body, and some inclined guide wheels are embedded in the cylinder through the slots, and the coolant entering the cylinder is discharged through the slots; the export cutting device comprises inclined guide wheels arranged on the surface of the frame, and a shelf assembly arranged on the side of the frame and arranged in a row, the frame and the shelf assembly are connected through a guide assembly, a cutting assembly is arranged at the end of the shelf assembly, and the cutting assembly comprises a conveying roller group and a cutting piece, the pipe passes through the middle of the conveying roller group, the conveying roller group is connected to the power device and can approach or move away from each other under the drive of the power device, when the conveying roller group is in a close state, the pipe located between the conveying roller groups is conveyed; when the conveying roller groups are in a far state, the pipe located between the conveying roller groups is not subjected to force.

2. A heat treatment line for pipes according to claim 1, characterized in that The first roller group is movably mounted on the base ring, the distance between the first roller groups is adjustable, and the pipe passes through the first roller groups. The guide member includes four second rollers that are adjustably arranged on the base ring, the second rollers can move along the diameter direction thereof, and the pipe passes through the middle of the four second rollers.

3. A heat treatment line for pipes according to claim 2, characterized in that The second roller can rotate around its central axis, and four second rollers are distributed in four directions of the upper, lower, left and right of the base ring through hole.

4. A heat treatment line for pipes according to claim 1, characterized in that Taking the width direction of the frame as the left and right direction, the loading device is divided into a stacking area, a guide area and a conveying area from left to right. An upper lifting plate is arranged at the bottom of the stacking area. The upper lifting plate is inclined and connected to the power device. The power device drives the upper lifting plate to move up and down. The guide area is inclined to be provided with a guide plate and a limit plate above the guide plate. The distance between the limit plate and the guide plate is only enough for one pipe to pass through. A plurality of inclined guide wheels are regularly arranged in the conveying area. The pipes passing through the guide area fall onto the inclined guide wheels in a direction parallel to the length direction of the frame.

5. A heat treatment line for pipes according to claim 1, characterized in that The pipe passes through the feeding device, the quenching device, the quenching cooling device, the tempering device, the tempering cooling device and the leading-out cutting device in sequence.

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