A natural gas solution heat treatment furnace for eliminating fine cracks in seamless steel pipes

Abstract

The present invention relates to the field of heat treatment technology, and discloses 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, a pipe arranged on the top of the wheel rack, a motor arranged on the rear wall of the furnace box, a heating mechanism arranged on the side of the furnace box away from the motor, a ventilation unit arranged on the side of the heating mechanism close to the motor, and a fixing mechanism arranged on the side of the heating mechanism away from the motor; the heating mechanism comprises an outer cylinder arranged on the inner wall of the furnace box close to the motor, a heat insulation 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, and a plurality of annular arrays of air holes opened on the top of the piston. By arranging the heating mechanism and the fixing mechanism, the inner wall of the steel pipe can be heated, so that the steel pipe can be heated synchronously inside and outside, and the steel pipe can be rotated so that the steel pipe is heated more evenly.

Description

Technical Field

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

[0002] A natural gas solution heat treatment furnace is an industrial furnace specifically designed for solution treatment of seamless smooth tubing. Its primary function is to fully dissolve alloying elements in metal materials by controlling heating temperature and time, thereby improving material properties. This heat treatment imparts excellent strength, toughness, and corrosion resistance to seamless smooth tubing. With its high efficiency, energy-saving, and environmentally friendly advantages, natural gas solution heat treatment furnaces have become essential equipment for improving product quality and reducing production costs in these industries.

[0003] Traditional natural gas solution heat treatment furnaces are widely used in the heat treatment field, but due to the limitations of their structure and operating principles, they often have 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. Because the heating method in the furnace mainly uses the flame or high-temperature gas in the furnace to radiate and convectively heat the workpiece surface, this heating method is difficult to directly act on the inner wall of the steel pipe. Therefore, traditional natural gas solution heat treatment furnaces cannot achieve simultaneous heating of the inner and outer walls of the steel pipe, resulting in insufficient dissolution of alloy elements on the inner wall and large differences 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 high consistency in the performance of the inner and outer walls is required, such as oil drilling and chemical pipelines. Traditional furnace types are difficult to meet 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, while rotating the steel pipe 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 cavity, pipes arranged on top of the wheel racks, a motor arranged on the rear wall of the furnace box, a heating mechanism arranged on the side of the furnace box away from the motor, a ventilation unit arranged on the side of the heating mechanism close to the motor, and a fixing mechanism arranged on the 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 close to 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 both 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 close to the motor side, two push rods symmetrically arranged on the movable sleeve close to the motor side, an air chamber arranged on the outer cylinder close to the motor side, two working medium ports symmetrically opened on the air chamber close to the motor side, and two air ports symmetrically opened on the air chamber close to 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, large bevel teeth 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 fixed 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 second clamping claw.

[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 gear arranged on the side of the stud away from the asynchronous gear.

[0014] Furthermore, guide strips are symmetrically provided 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 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 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.

[0017] 2. The fixed mechanism can rotate the steel pipe 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 solid 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 setting of the sealing plate, when the heating process is over, this mechanism allows the furnace to gradually replace the natural gas in the furnace by introducing 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 according to the present invention;

[0021] Figure 3 Schematic diagram of the relative positions of the heating mechanism and the fixing mechanism of the present invention;

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

[0023] Figure 5 Schematic diagram of the internal structure of the air chamber of the present invention;

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

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

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

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

[0028] Figure 10 This is a schematic diagram of the connection between the stopper and the spacer of the present invention;

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

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

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

[0032] In the picture:

[0033] 1. Furnace box; 2. Wheel frame; 3. Pipe; 4. Motor; 5. Heating mechanism; 6. Fixing mechanism; 51. Outer cylinder; 52. 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 medium port; 516. Air port; 517. Slide; 518. Spacer; 519. Sealing plate; 520. Handle; 521. Arc hole; 522. Stopper; 5 23. Push plate; 524. Stepped hole; 525. Ejector spring; 526. Latch; 527. Slot; 528. Button; 529. Return spring; 61. Rotating drum; 62. Driven pulley; 63. Driving pulley; 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. Gripper 1; 615. Gripper 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 embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] Example 1, with reference to Figures 1-13, 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 racks 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 rack 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, a heat insulation 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 at the bottom of the hinged 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 of the two 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 slidably connected to the inside of the movable sleeve 59, four circular holes 512 are opened in an annular array on the side of the outer cylinder 51 close to the motor 4, two push rods 513 are symmetrically fixedly connected to the side of the movable sleeve 59 close to the motor 4, an air chamber 514 is fixedly connected to the side of the outer cylinder 51 close to the motor 4, two working fluid ports 515 are symmetrically opened on the side of the air chamber 514 close to the motor 4, and two air ports 516 are 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 medium port 515 and close the gas port 516. Natural gas enters the gas chamber 514 from the working medium port 515 and enters the gap between the movable sleeve 59 and the heat insulation layer 52 through the circular hole 512. By pushing the push plate 523 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 down a certain distance, the natural gas passes through 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 simultaneously heating the inner and outer walls of the steel pipe. 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, and the handle 520 is slidingly connected to the slide groove 517 on the side close to the outer cylinder 51. Two arc-shaped holes 521 are symmetrically opened on both sides of the sealing plate 519, two symmetrically fixedly connected to the partition cylinder 518 close to the side of the outer cylinder 51, and the side of the block 522 close to the motor 4 is slidingly connected to the sealing plate 519, 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 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 pin 526 fixedly connected to the top of the ejection spring 525, two slots 527 symmetrically opened on the side of the spacer 518 close to the motor 4, and a button 528 slidably connected to the inside of 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 Figures 4-10 , 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 the 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 with the hinge 610 as the center, 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 1 615 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 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 the quality of the solid solution treatment. 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 Figure 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 cylinder 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 first clamping jaw 614 and the second clamping jaw 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 jaw 1 614 close to jaw 2 615, an inner rack 617 fixedly connected to the side of jaw 2 615 close to 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, thereby causing the clamping jaw 1 614 and the clamping jaw 2 615 to move in different directions.

[0049] Reference Figure 11-12 The inner side of the shell 611 is symmetrically provided with guide strips, and the top and bottom of the clamping jaw 1 614 and the clamping jaw 2 615 are both provided with guide grooves.

[0050] Specifically, the housing 611 can constrain the movement direction 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 Example 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 shell 611 to move through the guide rail 612. When the shell 611 moves, it drives the clamping jaw 1 614 and the clamping jaw 2 615 to move together. Since the shell 611 is constrained by the hinge 610, it can only rotate with the hinge 610 as the center. Therefore, the two 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 distance between the farthest ends 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 shell 611 and the clamping jaw to reset. , while the housing 611 is reset, the small bevel gear 619 is reset together with 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. 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 approaches each other until the steel is pressed. The 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 medium port 515, and the sealing of the working medium port 515 is released. Natural gas enters the gas chamber 514 through the working medium 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 chamber 53 is released, and natural gas can enter the air chamber 53 through the air hole 55 of the piston 54 and be discharged to the outside of the outer tube 51 through the air chamber 53. The natural gas at the outlet of the air chamber 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 action of the arc-shaped hole 521, while the working fluid port 515 is closed, the gas port 516 will be gradually opened, thereby maintaining the interior of the outer tube 51 in a positive pressure state. The inert gas released through the gas port 516 gradually replaces the natural gas in the outer tube 51, thereby preventing the natural gas from flashing back. Until the flame is extinguished, 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 and are not intended to limit the present invention. 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 solution heat treatment furnace for eliminating fine cracks in seamless steel pipes, comprising a furnace box (1), two linear array wheel racks (2) arranged at the bottom of the inner cavity of the furnace box (1), and a pipe (3) arranged on the top of the wheel racks (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) near 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 support shaft (58) arranged at the bottom of the connecting rod (57), a movable sleeve (59) arranged at the bottom of the support shaft (58), two symmetrically arranged on both sides of the outer cylinder (51), and a plurality of air holes (55) arranged on the top of the piston (54). a circular sleeve (510) on the inner wall of each end, the inner walls of the two circular sleeves (510) being slidably connected to the two ends of the movable sleeve (59), a fixed sleeve (511) being arranged inside the movable sleeve (59), four circular holes (512) being opened in an annular array on the side of the outer cylinder (51) close to the motor (4), two push rods (513) being symmetrically arranged on the side of the movable sleeve (59) close to the motor (4), an air chamber (514) being arranged on the side of the outer cylinder (51) close to the motor (4), two working fluid ports (515) being symmetrically opened on the side of the air chamber (514) close to the motor (4), and two air ports (516) being symmetrically opened on the side of the air chamber (514) close to the motor (4); The fixing mechanism (6) includes a rotating drum (61) arranged on the inner side of 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 on the outer side of the driven wheel (62), an output shaft of the motor (4) sequentially passing through the push plate (523) and the outer drum (51) to be 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 on the outer side of 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); The adjustment unit includes two brackets (69) symmetrically arranged on a side of the fixing sleeve (511) away from the air chamber (514), a hinge (610) arranged on a 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 a side of the shell (611) close to the pulling block (66), the inner side of the guide rail (612) being slidably connected to the pulling block (66), and a telescopic component arranged on a side of the shell (611) close to the bracket (69); The telescopic assembly includes a stud (613) provided on a side of the housing (611) close to the bracket (69), a clamping claw (614) provided on the outside of the stud (613), a clamping claw (615) provided on a side of the clamping claw (614) close to the outer cylinder (51), and a linkage assembly provided on a side of the clamping claw (614) close to the clamping claw (615); The linkage assembly includes an outer rack (616) provided on a side of the first clamp (614) close to the second clamp (615), an inner rack (617) provided on a side of the second clamp (615) close to the first clamp (614), an asynchronous gear (618) provided between the inner rack (617) and the outer rack (616), and a small bevel gear (619) provided on a side of the stud (613) away from the asynchronous gear (618).

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 chute (517) opened at the top of the air chamber (514), a partition (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 chute (517), two arc-shaped holes (521) symmetrically opened on both sides of the sealing plate (519), and two symmetrically arranged A stopper (522) is provided on the side of the spacer (518) close to the outer cylinder (51), the side of the stopper (522) close to the motor (4) is slidably connected to the sealing plate (519), a push plate (523) is provided on the side of the push rod (513) away from the movable sleeve (59), a return spring (529) is provided on the side of the push plate (523) close to the movable sleeve (59), both ends of the return spring (529) are fixedly connected to the push plate (523) and the outer cylinder (51), and a positioning component is provided 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 at 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 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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