Natural gas solid solution heat treatment furnace for eliminating fine cracks of seamless steel pipe

Abstract

The invention relates to the technical field of heat treatment, and discloses a natural gas solid solution heat treatment furnace for eliminating fine cracks of seamless steel pipes, which comprises a furnace box, two wheel carriers arranged at the bottom of an inner cavity of the furnace box in a linear array, pipes arranged at the tops of the wheel carriers, a motor arranged on the rear wall of the furnace box, and a heating mechanism arranged on one side, far away from the motor, of the furnace box, the ventilation unit is arranged on the side, close to the motor, of the heating mechanism; the fixing mechanism is arranged on the side, away from the motor, of the heating mechanism; the heating mechanism comprises an outer cylinder arranged on the inner wall of the side, close to the motor, of the furnace box, a heat insulation layer arranged on the inner wall of the outer cylinder, a plurality of air cavities formed in the outer wall of the outer cylinder in an annular array mode, pistons arranged in the air cavities and a plurality of air holes formed in the tops of the pistons in an annular array mode. And by arranging the heating mechanism and the fixing mechanism, the inner wall of the steel pipe can be heated, the steel pipe can be synchronously heated inside and outside, and the steel pipe can be rotated so that the steel pipe can be heated more uniformly.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment, in particular to a natural gas solid solution heat treatment furnace for eliminating fine cracks in seamless steel pipes. Background Art

[0002] The natural gas solution heat treatment furnace is an industrial furnace specially used for the solution treatment of seamless smooth tubes. Its main function is to fully dissolve the alloy elements in the metal material by controlling the heating temperature and time, so as to improve the material properties. Through heat treatment, the seamless smooth tube can obtain good strength, toughness, corrosion resistance and other properties. The natural gas solution heat treatment furnace has become an important equipment for these industries to improve product quality and reduce production costs due to its advantages of high efficiency, energy saving and environmental protection.

[0003] Traditional natural gas solution heat treatment furnaces are widely used in the field of heat treatment, but due to the limitations of their structure and working principle, there are often some problems that cannot be ignored. For example, traditional natural gas solution heat treatment furnaces have certain limitations when treating tubular workpieces such as steel pipes. Since the heating method in the furnace is mainly to radiate and convection heat the surface of the workpiece through the flame or high-temperature gas in the furnace, this heating method is difficult to directly act on the inner wall of the steel pipe. Therefore, the traditional natural gas solution heat treatment furnace cannot achieve synchronous heating of the inner and outer walls of the steel pipe, resulting in insufficient dissolution of the alloy elements on the inner wall and a large difference in the performance of the inner and outer walls. This heating unevenness may affect the overall mechanical properties and corrosion resistance of the steel pipe, especially in applications where the consistency of the performance of the inner and outer walls is required, such as oil drilling, chemical pipelines and other fields, and traditional furnace types are difficult to meet the process requirements. Summary of the invention

[0004] In view of the problem that the existing technology cannot achieve synchronous heating of the inner and outer walls of the steel pipe, a natural gas solution heat treatment furnace for eliminating fine cracks in seamless steel pipes is proposed.

[0005] Its purpose is to heat the inner wall of the steel pipe synchronously and prevent the natural gas from tempering, and to rotate the steel pipe at the same time, so as to achieve more uniform heating.

[0006] The technical solution of the present invention is a natural gas solid solution heat treatment furnace for eliminating fine cracks in seamless steel pipes, comprising a furnace box, two linear arrays of wheel racks arranged at the bottom of the furnace box inner cavity, pipes arranged at the top of the wheel racks, a motor arranged at the rear wall of the furnace box, a heating mechanism arranged at a side of the furnace box away from the motor, a ventilation unit arranged at a side of the heating mechanism close to the motor, and a fixing mechanism arranged at a side of the heating mechanism away from the motor;

[0007] The heating mechanism includes an outer cylinder arranged on the inner wall of the furnace box near the motor side, an insulating layer arranged on the inner wall of the outer cylinder, a plurality of annular arrays of air cavities opened on the outer wall of the outer cylinder, a piston arranged inside the air cavity, a plurality of annular arrays of air holes opened on the top of the piston, a support shaft 1 arranged at the bottom of the piston, a connecting rod arranged inside the support shaft 1, a support shaft 2 arranged at the bottom of the connecting rod, a movable sleeve arranged at the bottom of the support shaft 2, two circular sleeves symmetrically arranged on the inner walls of the two ends of the outer cylinder, the inner walls of the two circular sleeves are respectively slidably connected to the two ends of the movable sleeve, a fixed sleeve arranged inside the movable sleeve, four annular arrays of circular holes opened on the outer cylinder near the motor side, two push rods symmetrically arranged on the movable sleeve near the motor side, an air chamber arranged on the outer cylinder near the motor side, two working medium ports symmetrically opened on the air chamber near the motor side, and two air ports symmetrically opened on the air chamber near the motor side.

[0008] Furthermore, the ventilation unit includes a slide groove opened at the top of the air chamber, a partition cylinder arranged in the middle of the air chamber, a sealing plate arranged on the side of the air chamber close to the outer cylinder, a handle arranged on the side of the sealing plate close to the motor, the side of the handle close to the outer cylinder is slidably connected to the slide groove, two arc holes symmetrically opened on both sides of the sealing plate, two blocks symmetrically arranged on the side of the partition cylinder close to the outer cylinder, the side of the block close to the motor is slidably connected to the sealing plate, a push plate arranged on the side of the push rod away from the movable sleeve, a reset spring arranged on the side of the push plate close to the movable sleeve, the two ends of the reset spring are respectively fixedly connected to the push plate and the outer cylinder, and a positioning component arranged inside the push plate.

[0009] Furthermore, the positioning assembly includes two stepped holes symmetrically opened at the top and bottom of the push plate, an ejection spring arranged at the bottom of the stepped hole, a pin arranged at the top of the ejection spring, two slots symmetrically opened on the side of the partition close to the motor, and a button arranged inside the slot.

[0010] Furthermore, the fixing mechanism includes a rotating drum arranged on the inner side of the fixing sleeve, a driven wheel arranged on the side of the rotating drum close to the return spring, a driving wheel arranged on the outer side of the driven wheel, the output shaft of the motor passes through the push plate and the outer drum in sequence and is connected to the driving wheel, a threaded rod arranged inside the rotating drum, a screw sleeve arranged on the side of the threaded rod away from the air chamber, a pulling block arranged on the outer side of the screw sleeve, three annular arrays of handrails arranged on the side of the screw sleeve away from the pulling block, a large bevel tooth arranged on the side of the rotating rod close to the pulling block, and an adjustment unit arranged on the side of the fixing sleeve away from the motor.

[0011] Furthermore, the adjustment unit includes two brackets symmetrically arranged on the side of the fixing sleeve away from the air chamber, a hinge arranged on the side of the bracket close to the pulling block, two shells symmetrically arranged on both sides of the hinge, a guide rail arranged on the side of the shell close to the pulling block, the inner side of the guide rail is slidably connected to the pulling block, and a telescopic component arranged on the side of the shell close to the bracket.

[0012] Furthermore, the telescopic assembly includes a stud arranged on the side of the shell close to the bracket, a clamping claw 1 arranged on the outside of the stud, a clamping claw 2 arranged on the side of the clamping claw 1 close to the outer tube, and a linkage assembly arranged on the side of the clamping claw 1 close to the clamping claw 2.

[0013] Furthermore, the linkage assembly includes an outer rack arranged on the side of jaw 1 close to jaw 2, an inner rack arranged on the side of jaw 2 close to jaw 1, an asynchronous gear arranged between the inner rack and the outer rack, and a small bevel tooth arranged on the side of the stud away from the asynchronous gear.

[0014] Furthermore, guide strips are symmetrically arranged on the inner side of the shell, and guide grooves are provided on the top and bottom of the first and second clamping jaws.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Through the setting of the heating mechanism, the natural gas solution heat treatment furnace can achieve the purpose of heating the inner and outer walls of the steel pipe at the same time. The heating mechanism can heat the inner wall of the steel pipe by burning natural gas to ensure that the alloy elements on the inner wall are fully dissolved. Through this setting, the temperature difference between the inner and outer walls of the steel pipe is reduced during the solution heat treatment process, achieving the purpose of synchronous heating of the inside and outside. This improvement not only improves the overall performance consistency of the steel pipe, but also improves the heat treatment efficiency.

[0017] 2. The fixed mechanism can make the steel pipe rotate during the heating process. Through this rotation, the relative position between the steel pipe surface and the heat source changes continuously, thereby ensuring that the heat energy is evenly transferred to every part of the steel pipe, including the parts that are difficult to be directly heated. This rotation mechanism reduces the temperature difference caused by uneven radiation and convection, so that the inner and outer walls of the steel pipe can obtain a uniform heating effect, which improves the mechanical properties and microstructure of the steel pipe and improves the quality of the solution treatment. In addition, the addition of the rotating mechanism also reduces the deformation and stress concentration problems of the steel pipe caused by long-term uneven heating, and improves the dimensional accuracy and reliability of the final product.

[0018] 3. Through the sealing plate, when the heating process is over, the mechanism allows the natural gas in the furnace to be gradually replaced by the introduction of inert gas without reducing the gas pressure. The sealing plate ensures that the pressure in the furnace remains stable during the gas replacement process, avoiding the tempering phenomenon that may be caused by the drop in gas pressure. This flameout method not only improves the safety of the heat treatment process, but also ensures the stability of the atmosphere in the furnace and prevents oxidation or other adverse reactions. Through this inert gas replacement flameout method, the natural gas solution heat treatment furnace can safely complete the end stage of the heating cycle in an oxygen-free or low-oxygen environment, ensuring the quality of workpiece processing while protecting the safety of equipment and operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 A side view of a furnace box of the present invention;

[0021] Figure 3 It is a schematic diagram of the relative positions of the heating mechanism and the fixing mechanism of the present invention;

[0022] Figure 4 It is an exploded view of the heating mechanism of the present invention;

[0023] Figure 5 It is a schematic diagram of the internal structure of the air chamber of the present invention;

[0024] Figure 6 It is a schematic diagram of the connection between the driving wheel and the driven wheel of the present invention;

[0025] Figure 7 It is a schematic diagram of the connection between the push plate and the latch of the present invention;

[0026] Figure 8 It is a schematic diagram of the connection between the sealing plate and the air chamber of the present invention;

[0027] Fig. 9 is an enlarged view of the piston of the present invention;

[0028] Fig.10 It is a schematic diagram of the connection between the stopper and the spacer of the present invention;

[0029] Fig.11 It is an enlarged view of the fixing mechanism of the present invention;

[0030] Fig.12 This is a schematic diagram of the connection between the first and second clamping jaws of the present invention;

[0031] Fig.13 It is a schematic diagram of the connection between the stud and the clamping claw of the present invention.

[0032] In the figure:

[0033] 1. Furnace box; 2. Wheel frame; 3. Pipe; 4. Motor; 5. Heating mechanism; 6. Fixing mechanism; 51. Outer cylinder; 52. Heat insulation layer; 53. Air cavity; 54. Piston; 55. Air hole; 56. Support shaft 1; 57. Connecting rod; 58. Support shaft 2; 59. Moving sleeve; 510. Round sleeve; 511. Fixed sleeve; 512. Round hole; 513. Push rod; 514. Air chamber; 515. Working fluid port; 516. Air port; 517. Slide; 518. Spacer; 519. Sealing plate; 520. Handle; 521. Arc hole; 522. Stopper; 5 23. Push plate; 524. Step hole; 525. Ejection spring; 526. Latch; 527. Slot; 528. Button; 529. Return spring; 61. Drum; 62. Driven wheel; 63. Driving wheel; 64. Threaded rod; 65. Screw sleeve; 66. Pull block; 67. Handrail; 68. Large bevel gear; 69. Bracket; 610. Hinge; 611. Housing; 612. Guide rail; 613. Stud; 614. Jaw 1; 615. Jaw 2; 616. External rack; 617. Internal rack; 618. Asynchronous gear; 619. Small bevel gear. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0035] Example 1, reference Figure 1-Figure 13, which is the first embodiment of the present invention, provides a natural gas solid solution heat treatment furnace for eliminating fine cracks in seamless steel pipes, including a furnace box 1, two linear arrays of wheel frames 2 fixedly connected to the bottom of the inner cavity of the furnace box 1, a pipe 3 placed on the top of the wheel frame 2, and also includes a motor 4 fixedly connected to the rear wall of the furnace box 1, a heating mechanism 5 fixedly connected to the side of the furnace box 1 away from the motor 4, a ventilation unit fixedly connected to the side of the heating mechanism 5 close to the motor 4, and a fixing mechanism 6 fixedly connected to the side of the heating mechanism 5 away from the motor 4; the heating mechanism 5 includes an outer cylinder 51 fixedly connected to the inner wall of the furnace box 1 close to the motor 4, an insulating layer 52 fixedly connected to the inner wall of the outer cylinder 51, a plurality of annular arrays of air cavities 53 opened on the outer wall of the outer cylinder 51, a piston 54 slidably connected to the inside of the air cavity 53, and a plurality of annular arrays of pistons 54 opened on the top of the piston 54. The air hole 55 is provided with a support shaft 1 56 at the bottom of the piston 54, a connecting rod 57 is hinged on the inner side of the support shaft 1 56, a support shaft 2 58 is hinged on the bottom of the connecting rod 57, a movable sleeve 59 fixedly connected to the bottom of the support shaft 2 58, two circular sleeves 510 symmetrically fixedly connected to the inner walls at both ends of the outer cylinder 51, the inner walls of the two circular sleeves 510 are slidingly connected to the two ends of the movable sleeve 59 respectively, a fixed sleeve 511 slidingly connected inside the movable sleeve 59, four circular holes 512 in an annular array are opened on the side of the outer cylinder 51 close to the motor 4, two push rods 513 symmetrically fixedly connected to the side of the movable sleeve 59 close to the motor 4, an air chamber 514 fixedly connected to the side of the outer cylinder 51 close to the motor 4, two working fluid ports 515 symmetrically opened on the side of the air chamber 514 close to the motor 4, and two air ports 516 symmetrically opened on the side of the air chamber 514 close to the motor 4.

[0036] Specifically, the sealing plate 519 is rotated to open the working fluid port 515 and close the gas port 516. The natural gas enters the gas chamber 514 from the working fluid port 515 and enters the gap between the movable sleeve 59 and the heat insulating layer 52 through the circular hole 512. The push plate 523 is pushed to move toward the direction close to the outer cylinder 51. The push plate 523 can drive the movable sleeve 59 to move together. When the movable sleeve 59 moves, the support shaft 1 56 is driven downward through the support shaft 2 58 and the connecting rod 57. The support shaft 1 56 drives the piston 54 downward. After the piston 54 moves downward for a certain distance, the natural gas passes through the outer cylinder 51. The air hole 55 enters the air cavity 53, and enters the inner cavity of the steel pipe through the air cavity 53. At this time, the natural gas is ignited to heat the inner wall of the steel pipe. Through the heating mechanism 5, the natural gas solid solution heat treatment furnace can achieve the purpose of heating the inner and outer walls of the steel pipe at the same time. The heating mechanism 5 can heat the inner wall of the steel pipe by burning natural gas to ensure that the alloy elements on the inner wall are fully dissolved. Through this setting, the temperature difference between the inner and outer walls of the steel pipe is reduced during the solid solution heat treatment process, achieving the purpose of synchronous heating of the inside and outside. This improvement not only improves the overall performance consistency of the steel pipe, but also improves the heat treatment efficiency.

[0037] Reference Figure 5and Figure 8 The ventilation unit includes a slide groove 517 opened at the top of the air chamber 514, a partition cylinder 518 fixedly connected to the middle of the air chamber 514, a sealing plate 519 rotatably connected to the side of the air chamber 514 close to the outer cylinder 51, a handle 520 fixedly connected to the sealing plate 519 close to the motor 4, the handle 520 is slidingly connected to the slide groove 517 on the side close to the outer cylinder 51, two arc holes 521 symmetrically opened on both sides of the sealing plate 519, two stoppers 522 symmetrically fixedly connected to the partition cylinder 518 close to the outer cylinder 51, the stopper 522 is slidingly connected to the sealing plate 519 on the side close to the motor 4, a push plate 523 fixedly connected to the side of the push rod 513 away from the movable sleeve 59, a return spring 529 fixedly connected to the side of the push plate 523 close to the movable sleeve 59, the two ends of the return spring 529 are respectively fixedly connected to the push plate 523 and the outer cylinder 51, and a positioning component fixedly connected to the inside of the push plate 523.

[0038] Specifically, the inner side of the air chamber 514 can be isolated from the positioning assembly by the spacer 518 , and the air chamber 514 can be sealed.

[0039] Reference Figure 7 The positioning assembly includes two stepped holes 524 symmetrically opened at the top and bottom of the push plate 523, an ejection spring 525 fixedly connected to the bottom of the stepped hole 524, a latch 526 fixedly connected to the top of the ejection spring 525, two slots 527 symmetrically opened on the side of the partition 518 close to the motor 4, and a button 528 slidably connected inside the slot 527.

[0040] Specifically, the moved moving rod can be fixed by the positioning assembly so that the moving rod is fixed at the moved position.

[0041] Example 2, reference Figure 4-Figure 10 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the fixing mechanism 6 includes a rotating drum 61 rotatably connected to the inner side of the fixing sleeve 511, a driven wheel 62 fixedly connected to the rotating drum 61 on the side close to the return spring 529, a driving wheel 63 meshingly connected to the outer side of the driven wheel 62, the output shaft of the motor 4 sequentially passes through the push plate 523 and the outer drum 51 and is connected to the driving wheel 63, a threaded rod 64 rotatably connected to the inside of the rotating drum 61, a screw sleeve 65 meshingly connected to the side of the threaded rod 64 away from the air chamber 514, a pulling block 66 rotatably connected to the outer side of the screw sleeve 65, three annular arrays of handrails 67 fixedly connected to the side of the screw sleeve 65 away from the pulling block 66, a large bevel tooth 68 fixedly connected to the side of the rotating rod close to the pulling block 66, and an adjusting unit fixedly connected to the side of the fixing sleeve 511 away from the motor 4.

[0042] Specifically, by rotating the screw sleeve 65 to move it in a direction away from the bracket 69, the screw sleeve 65 drives the outer shell 611 to rotate through the pulling block 66 while moving, so that the two outer shells 611 continue to rotate around the hinge 610, and drive the clamping jaw 1 614 and the clamping jaw 2 615 to move while rotating. After the distance between the two clamping jaws 1 614 is close to each other to be smaller than the inner diameter of the steel pipe, the steel pipe is passed through the outer cylinder 51 in a surrounded state and placed on the two wheel frames 2, and then the screw sleeve 65 is rotated to reset the outer shell 611, and the motor 4 is started to drive the rotating drum 61 to rotate, and the rotating drum 61 drives the large bevel gear 68 to rotate, and the large bevel gear 68 drives the clamping jaw 1 614 and the clamping jaw 2 615 to clamp the steel pipe through the small bevel gear 619. 5 When the clamping force of the steel pipe is sufficient, the steel pipe will be driven to rotate so that different positions of the steel pipe can be heated. Through the fixing mechanism 6, the steel pipe can be rotated during the heating process. Through this rotation, the relative position between the steel pipe surface and the heat source is constantly changing, thereby ensuring that the heat energy is evenly transferred to every part of the steel pipe, including the part that is difficult to be directly heated. This rotation mechanism reduces the temperature difference caused by uneven radiation and convection, so that the inner and outer walls of the steel pipe can obtain a uniform heating effect, so that the mechanical properties and microstructure of the steel pipe are improved, and the quality of the solid solution treatment is improved. In addition, the addition of the rotating mechanism also reduces the deformation and stress concentration problems of the steel pipe caused by uneven heating for a long time, and improves the dimensional accuracy and reliability of the final product.

[0043] Reference Figure 11-13 The adjustment unit includes two brackets 69 symmetrically fixedly connected to the side of the fixing sleeve 511 away from the air chamber 514, a hinge 610 rotatably connected to the bracket 69 close to the pulling block 66, two shells 611 symmetrically fixedly connected on both sides of the hinge 610, a guide rail 612 fixedly connected to the side of the shell 611 close to the pulling block 66, the inner side of the guide rail 612 is slidably connected to the pulling block 66, and a telescopic component fixedly connected to the side of the shell 611 close to the bracket 69.

[0044] Specifically, the position of the outer shell 611 can be adjusted through the adjustment unit, thereby preventing the outer shell 611 from affecting the transportation of the steel pipe.

[0045] Reference Fig.13 The telescopic assembly includes a stud 613 rotatably connected to the side of the shell 611 close to the bracket 69, a clamp 1 614 meshingly connected to the outside of the stud 613, a clamp 2 615 slidably connected to the side of the clamp 1 614 close to the outer tube 51, and a linkage assembly fixedly connected to the side of the clamp 1 614 close to the clamp 2 615.

[0046] Specifically, the telescopic assembly can control the jaw 1 614 and the jaw 2 615 to move away from or closer to each other, thereby maintaining or releasing the clamping of the steel pipe.

[0047] Reference Figure 11-Figure 2 The linkage assembly includes an outer rack 616 fixedly connected to the side of the clamping jaw 1 614 close to the clamping jaw 2 615, an inner rack 617 fixedly connected to the side of the clamping jaw 2 615 close to the clamping jaw 1 614, an asynchronous gear 618 meshingly connected between the inner rack 617 and the outer rack 616, and a small bevel tooth 619 fixedly connected to the side of the stud 613 away from the asynchronous gear 618.

[0048] Specifically, the inner rack 617 and the outer rack 616 can be moved in different directions through the asynchronous gear 618, so that the clamping jaw 1 614 and the clamping jaw 2 615 can be moved in different directions.

[0049] Reference Figure 11-Figure 12 The inner side of the housing 611 is symmetrically provided with guide strips, and the tops and bottoms of the clamping jaws 1 614 and 2 615 are provided with guide grooves.

[0050] Specifically, the housing 611 can constrain the moving directions of the clamping jaw 1 614 and the clamping jaw 2 615. The clamping jaw 1 614 can drive the clamping jaw 2 615 to move in the opposite direction through the asynchronous gear 618 while moving. The rest of the structure is the same as that of the embodiment 1.

[0051] In summary, the working principle of the present invention is as follows: by rotating the screw sleeve 65, it drives the pulling block 66 to move in the direction away from the outer cylinder 51, and the pulling block 66 drives the outer shell 611 to move through the guide rail 612. When the outer shell 611 moves, it drives the clamping jaw 1 614 and the clamping jaw 2 615 to move together. Since the outer shell 611 is constrained by the hinge 610, it can only rotate around the hinge 610. Therefore, the two outer shells 611 will drive the two clamping jaws 1 614 and the clamping jaw 2 615 to move in the direction of merging with each other. When the farthest end distance of the two clamping jaws 1 614 is lower than the inner diameter of the steel pipe, the steel pipe is placed on the top of the two wheel frames 2, and the outer cylinder 51 passes through the inner cavity of the steel pipe, and then the screw sleeve 65 is rotated to drive the outer shell 611 and the clamping jaw to reset. , while the housing 611 is reset, the small bevel gear 619 is driven to reset together through the stud 613, so that the small bevel gear 619 is in meshing state with the large bevel gear 68, and then the motor 4 is started. The motor 4 drives the driven wheel 62 to rotate through the driving wheel 63, and the driven wheel 62 drives the large bevel gear 68 to rotate through the rotating drum 61, and the large bevel gear 68 drives the stud 613 to rotate through the small bevel gear 619. While the stud 613 rotates, the clamping jaw 1 614 is driven to move in the direction of the small bevel gear 619, and the clamping jaw 1 614 drives the outer rack 616 to rotate, and the outer rack 616 drives the inner rack 617 and the clamping jaw 2 615 to move in the direction away from the small bevel gear 619 through the asynchronous gear 618, so that the side of the clamping jaw 1 614 and the clamping jaw 2 615 away from the small bevel gear 619 is close to each other until the steel is pressed. The steel pipe is clamped, and the steel pipe is driven to rotate together. The clamping of the steel pipe can be released by reversing the motor 4. After the steel pipe is fixed, the sealing plate 519 is rotated by the handle 520 to block the gas port 516, and the arc hole 521 is aligned with the working fluid port 515 to release the blockage of the working fluid port 515. The natural gas enters the gas chamber 514 through the working fluid port 515, and enters the gap between the thermal insulation layer 52 and the movable sleeve 59 through the circular hole 512. Then, the push plate 523 and the push rod 513 are moved in the direction close to the outer cylinder 51. When the push plate 523 moves, the latch 526 is driven to move together. After the latch 526 moves to the bottom of the slot 527, it is inserted into the slot 527 under the action of the ejection spring 525, and the button 528 is pushed up. At the same time, the push plate 523 moves When the piston 54 moves downward, the blockage of the air cavity 53 is released, and the natural gas can enter the air cavity 53 through the air hole 55 of the piston 54 and be discharged from the outside of the outer tube 51 through the air cavity 53. The natural gas at the outlet of the air cavity 53 is ignited to form a continuous flame to heat the steel pipe. After the heating is completed, the sealing plate 519 is rotated to gradually block the working medium port 515.Through the arc hole 521, while the working fluid port 515 is closed, the gas port 516 will be gradually opened, so as to keep the interior of the outer tube 51 in a positive pressure state, and the inert gas released through the gas port 516 will gradually replace the natural gas in the outer tube 51, so as to prevent the natural gas from flashing back, until the flame is extinguished and the working fluid port 515 is also closed.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A natural gas solid solution heat treatment furnace for eliminating fine cracks in seamless steel pipes, comprising a furnace box (1), two linear arrays of wheel racks (2) arranged at the bottom of the inner cavity of the furnace box (1), and a pipe (3) arranged at the top of the wheel rack (2), characterized in that: It also includes a motor (4) arranged on the rear wall of the furnace box (1), a heating mechanism (5) arranged on the side of the furnace box (1) away from the motor (4), a ventilation unit arranged on the side of the heating mechanism (5) close to the motor (4), and a fixing mechanism (6) arranged on the side of the heating mechanism (5) away from the motor (4); The heating mechanism (5) comprises an outer cylinder (51) arranged on the inner wall of a furnace box (1) close to the motor (4), a heat insulating layer (52) arranged on the inner wall of the outer cylinder (51), a plurality of air cavities (53) arranged in an annular array on the outer wall of the outer cylinder (51), a piston (54) arranged inside the air cavity (53), a plurality of air holes (55) arranged in an annular array on the top of the piston (54), a support shaft (56) arranged at the bottom of the piston (54), a connecting rod (57) arranged inside the support shaft (56), a second support shaft (58) arranged at the bottom of the connecting rod (57), a moving sleeve (59) arranged at the bottom of the second support shaft (58), and two symmetrically arranged on both sides of the outer cylinder (51). The invention discloses a circular sleeve (510) for rotating the outer cylinder (51) and the inner wall of the two circular sleeves (510) respectively connected to the two ends of the movable sleeve (59) in a sliding manner; a fixed sleeve (511) arranged inside the movable sleeve (59); four circular holes (512) arranged in an annular array on a side of the outer cylinder (51) close to the motor (4); two push rods (513) symmetrically arranged on a side of the movable sleeve (59) close to the motor (4); an air chamber (514) arranged on a side of the outer cylinder (51) close to the motor (4); two working fluid ports (515) symmetrically arranged on a side of the air chamber (514) close to the motor (4); and two air ports (516) symmetrically arranged on a side of the air chamber (514) close to the motor (4).

2. The natural gas solution heat treatment furnace for eliminating fine cracks in seamless steel pipes according to claim 1, characterized in that: The ventilation unit comprises a slide groove (517) opened at the top of the air chamber (514), a partition tube (518) arranged in the middle of the air chamber (514), a sealing plate (519) arranged on the side of the air chamber (514) close to the outer tube (51), a handle (520) arranged on the side of the sealing plate (519) close to the motor (4), the side of the handle (520) close to the outer tube (51) is slidably connected to the slide groove (517), two arc holes (521) symmetrically opened on both sides of the sealing plate (519), and two symmetrically arranged A stopper (522) is disposed on the side of the partition tube (518) close to the outer tube (51), and the side of the stopper (522) close to the motor (4) is slidably connected to the sealing plate (519); a push plate (523) is disposed on the side of the push rod (513) away from the movable sleeve (59); a return spring (529) is disposed on the side of the push plate (523) close to the movable sleeve (59), and both ends of the return spring (529) are respectively fixedly connected to the push plate (523) and the outer tube (51); and a positioning component is disposed inside the push plate (523).

3. The natural gas solution heat treatment furnace for eliminating fine cracks in seamless steel pipes according to claim 2, characterized in that: The positioning assembly includes two stepped holes (524) symmetrically opened at the top and bottom of the push plate (523), an ejection spring (525) arranged at the bottom of the stepped hole (524), a latch (526) arranged at the top of the ejection spring (525), two slots (527) symmetrically opened on one side of the spacer (518) close to the motor (4), and a button (528) arranged inside the slot (527).

4. The natural gas solution heat treatment furnace for eliminating fine cracks in seamless steel pipes according to claim 1, characterized in that: The fixing mechanism (6) comprises a rotating drum (61) arranged inside the fixing sleeve (511), a driven wheel (62) arranged on the side of the rotating drum (61) close to the return spring (529), a driving wheel (63) arranged outside the driven wheel (62), an output shaft of the motor (4) sequentially passing through the push plate (523) and the outer drum (51) and connected to the driving wheel (63), a threaded rod (64) arranged inside the rotating drum (61), a screw sleeve (65) arranged on the side of the threaded rod (64) away from the air chamber (514), a pulling block (66) arranged outside the screw sleeve (65), three handrails (67) arranged in an annular array on the side of the screw sleeve (65) away from the pulling block (66), a large bevel tooth (68) arranged on the side of the rotating rod close to the pulling block (66), and an adjustment unit arranged on the side of the fixing sleeve (511) away from the motor (4).

5. The natural gas solution heat treatment furnace for eliminating fine cracks in seamless steel pipes according to claim 4, characterized in that: The adjustment unit includes two brackets (69) symmetrically arranged on the side of the fixing sleeve (511) away from the air chamber (514), a hinge (610) arranged on the side of the bracket (69) close to the pulling block (66), two shells (611) symmetrically arranged on both sides of the hinge (610), a guide rail (612) arranged on the side of the shell (611) close to the pulling block (66), the inner side of the guide rail (612) is slidably connected to the pulling block (66), and a telescopic component is arranged on the side of the shell (611) close to the bracket (69).

6. The natural gas solution heat treatment furnace for eliminating fine cracks in seamless steel pipes according to claim 5, characterized in that: The telescopic assembly includes a stud (613) arranged on a side of the housing (611) close to the bracket (69), a clamping jaw (614) arranged on the outside of the stud (613), a clamping jaw (615) arranged on a side of the clamping jaw (614) close to the outer cylinder (51), and a linkage assembly arranged on a side of the clamping jaw (614) close to the clamping jaw (615).

7. The natural gas solution heat treatment furnace for eliminating fine cracks in seamless steel pipes according to claim 6, characterized in that: The linkage assembly comprises an outer rack (616) arranged on the side of the first jaw (614) close to the second jaw (615), an inner rack (617) arranged on the side of the second jaw (615) close to the first jaw (614), an asynchronous gear (618) arranged between the inner rack (617) and the outer rack (616), and a small bevel tooth (619) arranged on the side of the stud (613) away from the asynchronous gear (618).

8. The natural gas solution heat treatment furnace for eliminating fine cracks in seamless steel pipes according to claim 5, characterized in that: The inner side of the housing (611) is symmetrically provided with guide strips, and the tops and bottoms of the first clamping jaw (614) and the second clamping jaw (615) are both provided with guide grooves.

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