Gas type heat treatment furnace for producing seamless steel pipe

Abstract

The invention relates to the technical field of heat treatment equipment, in particular to a gas type heat treatment furnace for producing seamless steel pipes, which comprises a furnace body, a heat insulation layer fixedly connected in the furnace body, a furnace door arranged on the furnace body in a lifting manner and a vehicle body arranged on the furnace body in a sliding manner, and heating assisting mechanisms are symmetrically arranged on the furnace body. A plurality of seamless steel pipes can be centered and fixed between the corresponding conical blocks, and the seamless steel pipes with different lengths and thicknesses can be centered and fixed. Inert gas can be rapidly distributed around the seamless steel pipe and in the furnace body, oxidation of the seamless steel pipe in the heat treatment process is effectively restrained, and the surface quality and corrosion resistance of the seamless steel pipe are improved. And each seamless steel pipe can be circularly close to flame, so that the plurality of seamless steel pipes are subjected to heat treatment more quickly and uniformly, and the production efficiency is improved. Mechanical properties such as strength and toughness of the seamless steel tube are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat treatment equipment, and particularly to a gas-fired heat treatment furnace for producing seamless steel pipes. Background Art

[0002] A seamless steel pipe is a long steel bar with a hollow cross-section and no seams around it. When producing seamless steel pipes, a trolley-type gas-fired heat treatment furnace is often used. By performing heat treatment operations such as heating in the trolley-type gas-fired heat treatment furnace, the organizational structure of the seamless steel pipe can be changed, thereby improving its properties such as strength, toughness, hardness, and wear resistance, and enabling it to meet the requirements of different application scenarios.

[0003] The existing trolley-type gas-fired heat treatment furnace mainly consists of a furnace body, a furnace door, and a vehicle body. The seamless steel pipes are centrally placed on the vehicle body. The vehicle body sends the seamless steel pipes into the furnace body and closes the furnace door. Subsequently, the furnace body is started, and a row of continuously spraying flames will emerge on both sides inside the furnace body. The flames transfer heat to the seamless steel pipes through radiation and convection, causing the seamless steel pipes to be heated. Heat insulation layers are connected to the inner wall of the furnace body, the back of the furnace door, and the upper end of the vehicle body, which can reduce the heat loss of the furnace body, thereby performing heat treatment on the seamless steel pipes.

[0004] However, seamless steel pipes are usually stacked on the upper end surface of the vehicle body. The seamless steel pipes in the middle position of the vehicle body are far from the flames. In order to enable the seamless steel pipes in the middle position to reach the required heat treatment temperature, it is necessary to extend the overall heat treatment time, reducing the production efficiency. At the same time, the gas-fired heat treatment furnace needs to be combined with oxygen delivery to generate flames. And seamless steel pipes are prone to oxidation at high temperatures and form oxide scales on their surfaces. The presence of oxide scales will not only affect the appearance quality of the seamless steel pipes but also reduce the corrosion resistance and wear resistance of the steel pipes. Summary of the Invention

[0005] The purpose of the present invention is to provide a gas-fired heat treatment furnace for producing seamless steel pipes to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A gas-fired heat treatment furnace for producing seamless steel pipes, including a furnace body, a heat insulation layer fixedly connected inside the furnace body, a furnace door arranged to be lifted on the furnace body, and a vehicle body arranged to slide on the furnace body. Positioning mechanisms are symmetrically arranged at the upper end of the vehicle body, and heat assisting mechanisms are symmetrically arranged on the furnace body; The positioning mechanism includes two supports, the two supports are symmetrically attached to the upper end of the vehicle body, and support rings are fixedly connected to the upper ends of the two supports. A first disk and a second disk are respectively rotatably arranged on the inner walls of the two support rings. A plurality of conical blocks are installed on the side wall of the first disk through a connection mechanism, and a plurality of tapered blocks are installed on the side wall of the second disk through an elastic mechanism. The center of the inner wall of the first disk is fixedly penetrated by a square rod, the square rod movably penetrates through the second disk, and a locking member is arranged between the second disk and the square rod. A square groove is formed at one end of the square rod close to the furnace body.

[0007] Preferably, the positioning mechanism further includes a plurality of positioning columns. The plurality of positioning columns are linearly and arrayedly slidably inserted into the bottom inner wall of the support close to the furnace body, and the bottom ends of the plurality of positioning columns are fixedly connected to the upper end of the vehicle body.

[0008] Preferably, the positioning mechanism further includes a second cylindrical groove and two sliding rings. The two sliding rings are respectively fixedly sleeved on the outer walls of the first disk and the second disk, and the two sliding rings are respectively slidably inserted into the inner walls of the two support rings. The second cylindrical groove is formed on the outer circumferential wall surface of the first disk, and a second spherical pin is slidably inserted into the second cylindrical groove. The second spherical pin movably penetrates through the sliding ring corresponding to the first disk, and the spherical end of the second spherical pin is slidably inserted into the inner wall of the support ring corresponding to the first disk, and a second spring is fixedly connected between the other end of the second spherical pin and the second cylindrical groove.

[0009] Preferably, the connection mechanism includes a plurality of rotating columns. The plurality of rotating columns are rotatably installed around the center of the first disk and penetrate through the inner wall of the first disk in a circumferential array. Gears are fixedly connected to the ends of the plurality of rotating columns close to the furnace body, and the other ends of the plurality of rotating columns are respectively fixedly connected to the side walls of the plurality of conical blocks. Cylindrical grooves are formed on the outer walls of the plurality of rotating columns, and first spherical pins are slidably inserted into the plurality of cylindrical grooves. The spherical ends of the plurality of first spherical pins are slidably inserted into the inner wall of the first disk, and a first spring is fixedly connected between the other ends of the plurality of first spherical pins and the plurality of cylindrical grooves respectively.

[0010] Preferably, the elastic mechanism includes a plurality of connecting columns. The plurality of connecting columns are slidably inserted into the inner wall of the second disk around the center of the second disk in a circumferential array. One ends of the plurality of connecting columns are respectively fixedly connected to the side walls of the plurality of tapered blocks, and rotating disks are slidably sleeved on the outer walls of the plurality of connecting columns. One side walls of the plurality of rotating disks are rotatably connected to the side wall of the second disk, and a fourth spring is fixedly connected between the other side walls of the plurality of rotating disks and the side walls of the plurality of tapered blocks respectively. The plurality of fourth springs are respectively slidably sleeved on the outer walls of the plurality of connecting columns.

[0011] Preferably, the heat assisting mechanism includes a motor and a second annular shell. The motor is fixedly installed on the side wall of the furnace body away from the vehicle body, and a connecting shaft is fixedly connected to the output shaft end of the motor. One end of the connecting shaft away from the motor sequentially passes through the furnace body and the heat insulation layer movably, and a connecting rod is fixedly connected to the end of the connecting shaft away from the motor. The second annular shell is fixedly installed through the inner walls of the furnace body and the heat insulation layer, and a first annular shell is rotatably connected to the side wall of the second annular shell away from the motor. A toothed ring is fixedly connected to the side wall of the first annular shell away from the second annular shell, and a plurality of splicing rods are fixedly connected between the inner ring surface of the first annular shell and the outer wall of the connecting rod. A connecting pipe is fixedly communicated with the side wall of the second annular shell close to the motor.

[0012] Preferably, the heat assisting mechanism further includes a pipe body. The pipe body is fixedly communicated with the edge of the side wall of the first annular shell away from the second annular shell, and a U-shaped block is fixedly connected to the outer wall of the pipe body close to the first annular shell. A spherical pin three is slidably inserted through the inner wall of the U-shaped block. A disc is fixedly connected to the flat end of the spherical pin three. A third spring is fixedly connected between the disc and the U-shaped block. The third spring is slidably sleeved on the outer wall of the spherical pin three.

[0013] Preferably, a plurality of convex blocks are fixedly connected to the outer ring surface of the support ring close to the furnace body.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the mutual cooperation of the positioning mechanism, the heat assisting mechanism, the connecting mechanism, the elastic mechanism, etc., during the heat treatment of seamless steel pipes, first of all, a plurality of seamless steel pipes can be centered and fixed between the corresponding conical blocks and tapered blocks. And according to the adjustability of the second disc and the taper of the conical blocks and tapered blocks, seamless steel pipes with different lengths and different thicknesses can be centered and fixed.

[0015] 2. Secondly, inert gas can quickly fill the surroundings of the seamless steel pipes and inside the furnace body. The inert gas has stable chemical properties and is not easy to chemically react with seamless steel pipes at high temperatures. After entering the furnace body, it can discharge air and form a protective atmosphere around the seamless steel pipes, reducing the contact between oxygen and seamless steel pipes, thereby effectively inhibiting the oxidation of seamless steel pipes during the heat treatment process, avoiding the generation of oxide scales, and improving the surface quality and corrosion resistance of seamless steel pipes.

[0016] 3. Thirdly, after the furnace body is started, the two rows of flames inside it can respectively aim at a plurality of seamless steel pipes in the states of revolution and rotation at two places. Each seamless steel pipe will cycle closer to the flame, so that the heat treatment of a plurality of seamless steel pipes can be carried out more quickly and evenly, improving the production efficiency.

[0017] 4. Again, seamless steel pipes can be subjected to resonance. Appropriate vibration can make the microstructure inside the seamless steel pipes more uniform and dense. Under the action of vibration, the diffusion of atoms and dislocation movement are more likely to occur, which helps to eliminate internal stress concentration, promote grain refinement and uniform distribution, and thus further improve the mechanical properties such as strength and toughness of the seamless steel pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure at the square rod of the present invention and a cross-sectional view of one of the support rings; Figure 3 is a cross-sectional view of the support ring, the first disk body, the sliding ring and the rotating column of the present invention; Figure 4 of the present invention Figure 3 is an enlarged view of the structure at A in; Figure 5 of the present invention Figure 3 is an enlarged view of the structure at B in; Figure 6 is a cross-sectional view of the furnace body and the heat insulation layer of the present invention; Figure 7 of the present invention Figure 6 is an enlarged view of the structure at C in; Figure 8 is another perspective cross-sectional view of the furnace body and the heat insulation layer of the present invention; Figure 9 is a display view of the square rod and the square groove of the present invention; Figure 10 is a schematic diagram of the structure at the second disk body of the present invention.

[0019] In the drawings, the list of components represented by each reference numeral is as follows: 1. Furnace body; 2. Furnace door; 3. Heat insulation layer; 4. Pipe body; 5. Square rod; 6. Vehicle body; 7. Conical block; 8. Support ring; 9. Connecting column; 10. First disk body; 11. Sliding ring; 12. Support; 13. Second disk body; 14. Conical block; 15. Positioning column; 16. Protrusion; 17. Gear; 18. Rotating column; 19. First spherical pin; 20. First spring; 21. First cylindrical groove; 22. Second cylindrical groove; 23. Second spring; 24. Second spherical pin; 25. First annular shell; 26. Tooth ring; 27. Connecting rod; 28. Third spherical pin; 29. Third spring; 30. Disk; 31. U-shaped block; 32. Motor; 33. Connecting pipe; 34. Second annular shell; 35. Connecting shaft; 36. Square groove; 37. Rotating disk; 38. Fourth spring; 39. Splicing rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] The present invention provides a technical solution: As Figures 1-10 shown, a gas-fired heat treatment furnace for producing seamless steel pipes includes a furnace body 1, a heat insulation layer 3 fixedly connected inside the furnace body 1, a furnace door 2 arranged to be lifted on the furnace body 1, and a vehicle body 6 slidably arranged on the furnace body 1. Positioning mechanisms are symmetrically arranged at the upper end of the vehicle body 6, and heat assisting mechanisms are symmetrically arranged on the furnace body 1; The positioning mechanism includes two supports 12. The two supports 12 are symmetrically attached to the upper end of the vehicle body 6, and support rings 8 are fixedly connected to the upper ends of the two supports 12. A first disk 10 and a second disk 13 are respectively rotatably arranged on the inner walls of the two support rings 8. A plurality of conical blocks 14 are installed on the side wall of the first disk 10 through a connection mechanism, and a plurality of tapered blocks 7 are installed on the side wall of the second disk 13 through an elastic mechanism. A square rod 5 is fixedly penetrated through the center of the inner wall of the first disk 10. The square rod 5 movably penetrates through the second disk 13. A locking member is arranged between the second disk 13 and the square rod 5. A square groove 36 is opened at one end of the square rod 5 close to the furnace body 1.

[0022] The positioning mechanism further includes a plurality of positioning columns 15. The plurality of positioning columns 15 are linearly arrayed and slidably inserted into the bottom inner wall of the support 12 close to the furnace body 1, and the bottom ends of the plurality of positioning columns 15 are fixedly connected to the upper end of the vehicle body 6.

[0023] The positioning mechanism further includes a second cylindrical groove 22 and two sliding rings 11. The two sliding rings 11 are respectively fixedly sleeved on the outer walls of the first disk 10 and the second disk 13, and the two sliding rings 11 are respectively slidably inserted into the inner walls of the two support rings 8. The second cylindrical groove 22 is opened on the outer peripheral wall surface of the first disk 10, and a second spherical pin 24 is slidably inserted into the second cylindrical groove 22. The second spherical pin 24 movably penetrates through the sliding ring 11 corresponding to the first disk 10, and the spherical end of the second spherical pin 24 is slidably inserted into the inner wall of the support ring 8 corresponding to the first disk 10. A second spring 23 is fixedly connected between the other end of the second spherical pin 24 and the second cylindrical groove 22.

[0024] The connecting mechanism includes multiple rotating columns 18. The multiple rotating columns 18 are rotationally and installed through the inner wall of the first disk body 10 in a circular array around the center of the first disk body 10. One ends of the multiple rotating columns 18 close to the furnace body 1 are fixedly connected with gears 17, and the other ends of the multiple rotating columns 18 are respectively fixedly connected with the side walls of multiple conical blocks 14. Column-shaped grooves one 21 are formed on the outer walls of the multiple rotating columns 18. Spherical pins one 19 are slidably inserted into the multiple column-shaped grooves one 21. The spherical ends of the multiple spherical pins one 19 are slidably inserted into the inner wall of the first disk body 10, and springs one 20 are fixedly connected between the other ends of the multiple spherical pins one 19 and the multiple column-shaped grooves one 21 respectively.

[0025] The elastic mechanism includes multiple connecting columns 9. The multiple connecting columns 9 are slidably inserted through the inner wall of the second disk body 13 in a circular array around the center of the second disk body 13. One ends of the multiple connecting columns 9 are respectively fixedly connected with the side walls of multiple conical blocks 7. Rotating disks 37 are slidably sleeved on the outer walls of the multiple connecting columns 9. One side walls of the multiple rotating disks 37 are rotatably connected with the side wall of the second disk body 13, and springs four 38 are fixedly connected between the other side walls of the multiple rotating disks 37 and the side walls of the multiple conical blocks 7 respectively. The multiple springs four 38 are respectively slidably sleeved on the outer walls of the multiple connecting columns 9.

[0026] The heat assisting mechanism includes a motor 32 and a second annular shell 34. The motor 32 is fixedly installed on the side wall of the furnace body 1 away from the vehicle body 6. The output shaft end of the motor 32 is fixedly connected with a connecting shaft 35. One end of the connecting shaft 35 away from the motor 32 sequentially passes through the furnace body 1 and the heat insulation layer 3 movably, and one end of the connecting shaft 35 away from the motor 32 is fixedly connected with a connecting rod 27. The second annular shell 34 is fixedly installed through the inner walls of the furnace body 1 and the heat insulation layer 3. The side wall of the second annular shell 34 away from the motor 32 is rotationally connected with a first annular shell 25. A toothed ring 26 is fixedly connected to the side wall of the first annular shell 25 away from the second annular shell 34. Multiple splicing rods 39 are fixedly connected between the inner ring surface of the first annular shell 25 and the outer wall of the connecting rod 27. A connecting pipe 33 is fixedly communicated with the side wall of the second annular shell 34 close to the motor 32.

[0027] The heat assisting mechanism further includes a pipe body 4. The pipe body 4 is fixedly communicated with the edge of the side wall of the first annular shell 25 away from the second annular shell 34. A U-shaped block 31 is fixedly connected to the outer wall of the pipe body 4 close to the first annular shell 25. A spherical pin three 28 is slidably inserted through the inner wall of the U-shaped block 31. A disk 30 is fixedly connected to the flat end of the spherical pin three 28. A spring three 29 is fixedly connected between the disk 30 and the U-shaped block 31. The spring three 29 is slidably sleeved on the outer wall of the spherical pin three 28.

[0028] Multiple convex blocks 16 are fixedly connected to the outer ring surface of the support ring 8 close to the furnace body 1.

[0029] Working principle: First, seamless steel pipes are respectively placed outside two square rods 5. The operation of placing one seamless steel pipe is as follows: First, through a locking member (it should be noted that the locking member can be the cooperation of a sleeve frame and a screw, that is, the sleeve frame is sleeved outside the square rod 5 and fixedly connected to the second disk body 13, the screw thread penetrates through the sleeve frame and one end is tightly abutted against the outer wall of the square rod 5. Loosen the screw to slide the second disk body 13 outside the square rod 5 and drive the sleeve frame to slide outside the square rod 5 together. Tighten the screw to fix the second disk body 13 outside the square rod 5) to adjust the position of the second disk body 13 on the outer wall of the square rod 5. The second disk body 13 will drive multiple connecting columns 9, multiple rotating disks 37, multiple fourth springs 38 and multiple conical blocks 7 to move together until the length between the tip of the conical block 7 and the tip of the conical block 14 is slightly less than the length of the seamless steel pipe. At this time, pull out a corresponding connecting column 9 outward. The connecting column 9 will slide in the second disk body 13, and the connecting column 9 will drive the conical block 7 to squeeze the fourth spring 38 connected to the corresponding rotating disk 37 until the distance between the conical block 7 and the corresponding conical block 14 meets the insertion of the seamless steel pipe. Then, abut one port of the seamless steel pipe against the tip of the conical block 7, and then release the connecting column 9. Under the action of the fourth spring 38, the tip of the conical block 7 will automatically abut tightly against the other port of the seamless steel pipe. Since both the conical block 7 and the conical block 14 have inclined conical surfaces, the center of the seamless steel pipe can be aligned with the centers of the conical block 7 and the conical block 14 under the extrusion fit between the port of the seamless steel pipe and the conical surface. At this time, the centering and fixing of one seamless steel pipe can be completed. The other seamless steel pipes are fixed between the corresponding conical blocks 7 and conical blocks 14 in the same operation as above. It is worth mentioning that according to the adjustability of the second disk body 13 and the taper of the conical block 7 and the conical block 14, seamless steel pipes of different lengths and different thicknesses can be centered and fixed.

[0030] Subsequently, the vehicle body 6 is started to move the vehicle body 6 into the furnace body 1. The vehicle body 6 can drive the four supports 12, the four support rings 8, the two first discs 10, the two second discs 13, the two square rods 5, etc. into the furnace body 1 through the positioning posts 15 until the vehicle body 6 completely enters the furnace body 1. At this time, the furnace door 2 is started and the furnace door 2 is moved downward to close the opening of the furnace body 1. At this time, the square grooves 36 on the two square rods 5 will be respectively engaged with the two connecting rods 27, and at this time, the multiple gears 17 outside the first disc 10 will be engaged into the inner sides of the corresponding toothed rings 26. Subsequently, the pipes for conveying inert gas are respectively connected to the two connecting pipes 33. Then, the two motors 32 are started. Each motor 32 can drive the connected connecting shafts 35, the connecting rods 27, the splicing rods 39, the first annular shell 25 and the toothed ring 26 to rotate together. Each connecting rod 27 will drive the square rod 5 on its outer side to rotate. Each square rod 5 will drive the connected first disc 10 and the second disc 13 to rotate together. The sliding rings 11 outside the first disc 10 and the second disc 13 will rotate in their corresponding support rings 8, and the multiple conical blocks 14 and the multiple tapered blocks 7 will rotate around the center of the corresponding square rod 5 together. Then, the seamless steel pipes will continuously rotate around the center of the square rod 5. At the same time, the gears 17 connected to the multiple conical blocks 14 will rotate around the center of the toothed ring 26 inside the corresponding toothed ring 26. And under the meshing action of the gears 17 and the toothed rings 26, the multiple toothed rings 26 will also rotate on their own. Then, it can drive the multiple conical blocks 14 to rotate on their own. Then, when the multiple seamless steel pipes rotate around the center of the square rod 5, they will also rotate on their own and drive each tapered block 7 to rotate together. The tapered block 7 will drive the rotating disc 37 to rotate on the side wall of the second disc 13 through the fourth spring 38.

[0031] It should be noted that the first annular shell 25 will rotate on the second annular shell 34. The second annular shell 34 will drive the pipe body 4 to rotate. The inert gas entering along the connecting pipe 33 will enter the second annular shell 34 and the first annular shell 25, and finally enter the pipe body 4 and be discharged from the multiple uniformly distributed exhaust ports on the pipe body 4. Since the pipe body 4 is rotating and the rotation diameter is larger than the rotation radius of the seamless steel pipe, the surrounding of the seamless steel pipe and the inside of the furnace body 1 can be quickly filled with inert gas. The inert gas has stable chemical properties and is not easy to chemically react with the seamless steel pipe at high temperature. After being filled into the furnace body 1, the air can be discharged, a protective atmosphere is formed around the seamless steel pipe, and the contact between oxygen and the surface of the seamless steel pipe is reduced, thereby effectively inhibiting the oxidation of the seamless steel pipe during the heat treatment process, avoiding the generation of oxide scales, and improving the surface quality and corrosion resistance of the seamless steel pipe.

[0032] It should also be noted that after the furnace body 1 is started, the two rows of flames inside it can be respectively aligned with the multiple seamless steel pipes in the two places in the state of revolution and rotation. Each seamless steel pipe will cycle close to the flame, so that the multiple seamless steel pipes can be heat-treated more quickly and evenly, improving the production efficiency.

[0033] It should also be noted that when each pipe body 4 rotates, it will also drive the connected U-shaped block 31, spherical pin three 28, disc 30 and spring three 29 to rotate together. The spherical surface of the spherical pin three 28 will rotate along the outer ring surface of the support ring 8 of the corresponding first disc body 10, and the spherical surface of the spherical pin three 28 will sequentially press against multiple bumps 16 on the outer ring surface of the support ring 8. When the spherical surface of the spherical pin three 28 passes over a bump 16, the spherical surface of the spherical pin three 28 will squeeze against it. Under the action of the squeeze, the spherical pin three 28 will slide away from the bump 16 in the U-shaped block 31 and drive the disc 30 to stretch the spring three 29. When the spherical surface of the spherical pin three 28 leaves the bump 16, under the action of the spring three 29, the spherical surface of the spherical pin three 28 will automatically reset and impact the corresponding support ring 8, causing the seamless steel pipe to resonate. Appropriate vibration can make the microscopic tissue structure inside the seamless steel pipe more uniform and dense. Under the action of vibration, the diffusion of atoms and dislocation movement are more likely to occur, which helps to eliminate internal stress concentration, promote grain refinement and uniform distribution, thereby further improving the mechanical properties such as strength and toughness of the seamless steel pipe.

[0034] It should also be noted that when the first disc body 10 and the connected sliding ring 11 rotate, they will also drive the cylindrical groove two 22, spherical pin two 24 and spring two 23 to rotate together. During this process, the spherical end of the spherical pin two 24 will slide into the cylindrical groove two 22 due to the squeeze between the spherical groove adapted to the inner wall of the support ring 8, and squeeze the spring two 23. Subsequently, the spherical end of the spherical pin two 24 will always rotate along the inner wall of the support ring 8 until the spherical end of the spherical pin two 24 rotates to correspond to the spherical groove adapted to the inner wall of the support ring 8. Under the action of the spring two 23, the spherical end of the spherical pin two 24 will automatically cooperate with the spherical groove, and this process will repeat continuously. Before the seamless steel pipe enters the furnace body 1, rotate the first disc body 10 so that the spherical end of the spherical pin two 24 cooperates with the corresponding spherical groove, then the square rod 5 at the center of the first disc body 10 will exactly correspond to the connecting rod 27, and the first disc body 10 can maintain a certain fixed state, which is convenient for the alignment between the square rod 5 and the connecting rod 27. Similarly, when the gear 17 rotates on its own axis, it will drive the rotating column 18, cylindrical groove one 21, spherical pin one 19 and spring one 20 to rotate together. Based on a similar principle as above, before the seamless steel pipe enters the furnace body 1, when the spherical pin one 19 cooperates with the corresponding spherical groove in the first disc body 10, the tooth block of the gear 17 will correspond to the tooth gap of the tooth ring 26, which is convenient for the alignment between the gear 17 and the tooth ring 26.

[0035] It should also be noted that the tube body 4, annular shell 1 25, annular shell 2 34, connecting shaft 35, connecting rod 27, connecting tube 33, and splicing rod 39 are all made of hard thermal insulation material to minimize heat leakage and prevent heat damage to motor 32. Other corresponding components are also made of hard high-temperature resistant materials to ensure normal operation of the components under high temperatures. Hard thermal insulation materials and hard high-temperature resistant materials are both well-known in the prior art and will not be described in detail.

[0036] It should also be noted that the tube body 4 is always in a high-speed exhaust state, and it is difficult for hot gas to enter the tube body 4 and emerge from the connecting pipe 33.

[0037] It should also be noted that after the seamless steel pipe is heat treated, everything returns to normal. Figure 1 In the state shown, the two positioning mechanisms at the upper end of the vehicle body 6 can be lifted away by means of a lifting device, and the supports 12 in the positioning mechanisms will leave the corresponding positioning columns 15.

[0038] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0039] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A gas-fired heat treatment furnace for producing seamless steel pipes, comprising a furnace body, a heat insulation layer fixedly connected inside the furnace body, a furnace door liftably arranged on the furnace body, and a vehicle body slidably arranged on the furnace body, characterized in that: Positioning mechanisms are symmetrically arranged at the upper end of the vehicle body, and heat assisting mechanisms are symmetrically arranged on the furnace body; The positioning mechanism includes two supports. The two supports are symmetrically attached to the upper end of the vehicle body, and support rings are fixedly connected to the upper ends of the two supports. A first disk and a second disk are respectively rotatably arranged on the inner walls of the two support rings. A plurality of conical blocks are installed on the side wall of the first disk through a connecting mechanism, and a plurality of tapered blocks are installed on the side wall of the second disk through an elastic mechanism. The center of the inner wall of the first disk is fixedly penetrated by a square rod, and the square rod movably penetrates the second disk. A locking member is arranged between the second disk and the square rod, and a square groove is opened at one end of the square rod close to the furnace body.

2. The gas-fired heat treatment furnace for producing seamless steel pipes according to claim 1, wherein: The positioning mechanism further includes a plurality of positioning columns. The plurality of positioning columns are linearly arrayed and slidably inserted into the bottom inner wall of the support close to the furnace body, and the bottom ends of the plurality of positioning columns are fixedly connected to the upper end of the vehicle body.

3. A gas-fired heat treatment furnace for producing seamless steel pipes according to claim 1, characterized in that: The positioning mechanism further includes a second cylindrical groove and two sliding rings. The two sliding rings are respectively fixedly sleeved on the outer walls of the first disk and the second disk, and the two sliding rings are respectively slidably inserted into the inner walls of the two support rings. The second cylindrical groove is opened on the outer circumferential wall surface of the first disk, and a second spherical pin is slidably inserted into the second cylindrical groove. The second spherical pin movably penetrates the sliding ring corresponding to the first disk, and the spherical end of the second spherical pin is slidably inserted into the inner wall of the support ring corresponding to the first disk. A second spring is fixedly connected between the other end of the second spherical pin and the second cylindrical groove.

4. A gas-fired heat treatment furnace for producing seamless steel pipes according to claim 1, characterized in that: The connecting mechanism includes a plurality of rotating columns. The plurality of rotating columns are arranged in a circular array around the center of the first disk and are rotatably installed through the inner wall of the first disk. Gears are fixedly connected to the ends of the plurality of rotating columns close to the furnace body, and the other ends of the plurality of rotating columns are respectively fixedly connected to the side walls of the plurality of conical blocks. Cylindrical grooves are opened on the outer walls of the plurality of rotating columns, and a first spherical pin is slidably inserted into each of the plurality of cylindrical grooves. The spherical ends of the plurality of first spherical pins are slidably inserted into the inner wall of the first disk, and a first spring is fixedly connected between the other ends of the plurality of first spherical pins and the corresponding cylindrical grooves.

5. A gas-fired heat treatment furnace for producing seamless steel pipes according to claim 1, characterized in that: The elastic mechanism includes a plurality of connecting columns. The plurality of connecting columns are arranged in a circular array around the center of the second disk and are slidably inserted through the inner wall of the second disk. The ends of the plurality of connecting columns are respectively fixedly connected to the side walls of the plurality of tapered blocks, and rotating disks are slidably sleeved on the outer walls of the plurality of connecting columns. One side walls of the plurality of rotating disks are rotatably connected to the side wall of the second disk, and a fourth spring is fixedly connected between the other side walls of the plurality of rotating disks and the side walls of the plurality of tapered blocks. The plurality of fourth springs are respectively slidably sleeved on the outer walls of the plurality of connecting columns.

6. A gas-fired heat treatment furnace for producing seamless steel pipes according to claim 1, characterized in that: The heat assisting mechanism includes a motor and a second annular shell. The motor is fixedly installed on the side wall of the furnace body away from the vehicle body, and a connecting shaft is fixedly connected to the output shaft end of the motor. The end of the connecting shaft away from the motor sequentially passes through the furnace body and the heat insulation layer movably, and a connecting rod is fixedly connected to the end of the connecting shaft away from the motor. The second annular shell is fixedly installed through the inner walls of the furnace body and the heat insulation layer, and the first annular shell is rotatably connected to the side wall of the second annular shell away from the motor. A toothed ring is fixedly connected to the side wall of the first annular shell away from the second annular shell, and a plurality of splicing rods are fixedly connected between the inner ring surface of the first annular shell and the outer wall of the connecting rod. A connecting pipe is fixedly communicated with the side wall of the second annular shell close to the motor.

7. A gas-fired heat treatment furnace for producing seamless steel pipes according to claim 6, characterized in that: The heat assisting mechanism further includes a pipe body. The pipe body is fixedly communicated with the edge of the side wall of the first annular shell away from the second annular shell, and a U-shaped block is fixedly connected to the outer wall of the pipe body close to the first annular shell. A spherical pin three is slidably inserted through the inner wall of the U-shaped block. A disc is fixedly connected to the flat end of the spherical pin three. A third spring is fixedly connected between the disc and the U-shaped block. The third spring is slidably sleeved on the outer wall of the spherical pin three.

8. A gas-fired heat treatment furnace for producing seamless steel pipes according to claim 1, characterized in that: A plurality of convex blocks are fixedly connected to the outer ring surface of the support ring close to the furnace body.

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