Solution heat treatment device and method for small diameter seamless pipes

Abstract

The present invention discloses a solution heat treatment device and method for small-diameter seamless pipes, belonging to the technical field of pipe processing devices and methods, including: a hydrogen furnace, the hydrogen furnace including a preheating zone, a heating zone, a heat preservation zone and a cooling zone; a conveyor line, the conveyor line is installed on a frame and extends along a preset direction, used to carry and convey plates, and the conveyor line runs through the hydrogen furnace and extends to the outside; a pipe exhaust mechanism, the pipe exhaust mechanism includes a panel installed on the heating zone, the panel and the heating zone are connected by a bracket, both sides of the top of the panel are connected to a movable plate by a cylinder, a first motor is fixedly installed on the movable plate, and the output shaft of the first motor extends to the center gear. The present invention can solve the technical problems that when the pipe diameter is small, it is difficult for the protective gas to enter the pipe, air remains in the pipe, the inner wall is not bright after annealing, the inner wall is discolored or white spots are formed, and the final quality of the product is affected.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe processing devices and methods, and specifically relates to a solution heat treatment device and method for small-diameter seamless pipes. Background Art

[0002] Solution treatment refers to the heat treatment process of heating the alloy to a high temperature single-phase region and maintaining it at a constant temperature, so that the excess phase is fully dissolved into the solid solution and then rapidly cooled to obtain a supersaturated solid solution. Solution treatment is to dissolve carbides and Y phases in the matrix to obtain a uniform supersaturated solid solution, which is convenient for re-precipitation of fine-grained, evenly distributed carbides and Y strengthening phases during aging, while eliminating the stress caused by hot and cold processing to cause the alloy to recrystallize. Secondly, solution treatment is to obtain a suitable grain size to ensure the high-temperature creep resistance of the alloy.

[0003] Most of the existing stainless steel pipe solid solution annealing adopts online black solid solution, and pickling or direct black pipe sale is carried out after annealing, which is labor-intensive and time-consuming, reduces product quality, and produces harmful gases that endanger personnel health and pollute the environment. The bright solid solution annealing of stainless steel pipes generally uses a hydrogen + nitrogen mixed protective atmosphere or pure hydrogen as a protective atmosphere for annealing. Small-diameter pipes are difficult to enter the pipe due to their small diameter. The residual air in the pipe is prone to oxidation. After annealing, the inner wall has a poor bright effect, the inner wall changes color or forms white spots, and white spots affect the final quality of the product. In addition, the existing technical solution can continuously absorb hydrogen into the pipe by connecting to an air suction device, but it will absorb excessive hydrogen, resulting in a waste of hydrogen, which is not conducive to saving and environmental protection. Summary of the invention

[0004] The purpose of the present invention is to provide a solution heat treatment device and method for small-diameter seamless pipes to solve the technical problems that due to the small diameter of the pipe, it is difficult for the protective gas to enter the pipe, and air remains in the pipe, resulting in poor inner wall brightness after annealing, discoloration of the inner wall or formation of white spots and white spots, which affect the final quality of the product.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] Solution heat treatment equipment for small diameter seamless pipes, including:

[0007] A hydrogen furnace, the hydrogen furnace comprising a preheating zone, a heating zone, a heat preservation zone and a cooling zone;

[0008] A conveyor line, which is installed on the frame and extends in a preset direction to carry and convey the plate, and the conveyor line passes through the hydrogen furnace and extends to the outside;

[0009] A pipe exhaust mechanism, the pipe exhaust mechanism comprises a panel installed on the heating zone, the panel and the heating zone are connected by a bracket, both sides of the top of the panel are connected to a movable plate by a cylinder, a first motor is fixedly installed on the movable plate, the output shaft of the first motor extends to the central gear, both ends of the outer wall of the central gear are meshed with a first gear plate and a second gear plate that move in opposite directions, and the outer walls of the first gear plate and the second gear plate are extended by telescopic curtain plates and are correspondingly connected to the exhaust pipe and the end cap;

[0010] The panel is provided with a strip groove connected to the extended ends of the first gear plate and the second gear plate, an air compressor adapted thereto is installed on the heating zone, an air outlet hose on the air compressor passes through the heating zone and extends to the air extraction pipe, the outer wall edge of the air extraction pipe is connected to the air outlet hose by a threaded connection, and one end of the air outlet hose is connected to a first air pipe extending to the outer wall of the heating zone, and a first one-way valve is installed on the first air pipe;

[0011] The tube tail clamping and sealing mechanism comprises a second motor placed on the heat preservation zone, the output shaft of the second motor extends to the first bevel gear inside the heat preservation zone, the outer wall of the first bevel gear is meshed with a second bevel gear fixed on the lead screw shaft, the first rotating shaft and the second rotating shaft at the center of the first bevel gear are connected by a conveyor belt transmission, and a resistance rod is fixedly connected to one end of the outer wall of the second rotating shaft, and a lead screw nut fixed on the pressing plate is spirally driven on the lead screw shaft;

[0012] The first rotating shaft, the second rotating shaft and the outside of the pressing plate are all placed on a cover body on the inner wall of the heat preservation area, and a swing groove connected to the abutment rod is opened at the bottom end of the cover body.

[0013] Furthermore, it also includes a metal plug placed on the conveyor line and connected to the corresponding pipe, one end of the metal plug is integrally formed with a tapered portion, and the other end is provided with a fixing block that contacts and fits with the abutment rod.

[0014] Furthermore, an argon tank is supported and connected to the hydrogen furnace, and a flow pipeline fixed on the regulating valve is connected to the argon tank through a pump body.

[0015] Furthermore, a second air pipe fixed on the fan is installed on the cooling zone, and a second one-way valve is connected to the second air pipe.

[0016] Furthermore, a movable cavity connected to the central gear is provided in the movable plate, and the transmission ratio between the central gear and the first gear plate is kept the same as the transmission ratio between the central gear and the second gear plate.

[0017] Furthermore, a positioning hole connected to the extended ends of the first gear plate and the second gear plate is provided on the telescopic curtain plate. As the cylinder and the first motor are started, the exhaust pipe and the cover head move up and down, and the exhaust pipe and the cover head clamp or separate the pipe from each other. At the same time, the exhaust pipe draws air from the inside of the pipe and discharges it through an air compressor.

[0018] Furthermore, a frame connected to the heat preservation zone is provided at the bottom end of the second motor. When the second motor is started, the pressing plate presses down on the pipe, and at the same time, the resistance rod closes the metal plug at the tail of the pipe by means of rotational positioning.

[0019] The solution heat treatment method for small diameter seamless pipes includes the following steps:

[0020] S1. Open the feed port in the hydrogen furnace and transport the pipes to the preheating zone, heating zone, insulation zone and cooling zone in sequence through the conveying line;

[0021] S2. Open the regulating valve and ensure that the air in the furnace is exhausted by purging with argon gas. After the purging is completed, close the regulating valve;

[0022] S3. When the temperature in the hydrogen furnace rises to 800°C, turn on the hydrogen input switch on the operation interface, introduce hydrogen and observe the hydrogen flow and pressure in time;

[0023] S4. After hydrogen is introduced, the temperature rise platform is set according to the temperature difference of each zone. During the temperature rise process, the hydrogen flow rate is reasonably controlled, and each zone in the hydrogen furnace is heated to the corresponding temperature;

[0024] S5. When the head of the pipe reaches the heating zone, the pipe exhaust mechanism exhausts air from each pipe one by one, and the air in the pipe can be extracted by utilizing the pressure difference between the pipe and the inside of the heating zone;

[0025] S6. When the tail of the tube is two meters away from the furnace mouth, plug the tail of the tube through the metal plug in the tube tail clamping and sealing mechanism. When the tail of the tube is out of the furnace, remove the metal plug to complete the solution heat treatment.

[0026] Furthermore, the transmission speed of the conveying line of the pipe entering the hydrogen furnace is set to 0.42m / min.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0028] (1) A conveyor line is set up to carry and transport pipes while providing working space for subsequent preheating, heating, insulation and cooling processes, thereby ensuring that the pipes can be processed in an orderly manner, improving the safety of equipment operation, and enabling the pipes to be automatically collected after the corresponding processing operations.

[0029] (2) A pipe exhaust mechanism is provided. When the pipe enters the heating zone, the cylinder is started, so that the exhaust pipe and the end cap are aligned with the pipe, so that the three are kept on the same horizontal plane. Then the first motor is started, which can drive the rotation of the central gear. With the help of the meshing transmission of the gears, the exhaust pipe and the end cap move synchronously in opposite directions, so that pipes of different lengths can be clamped and fixed. The setting of the telescopic curtain plate on the heating zone can ensure the normal movement of the first gear plate and the second gear plate on the one hand, and ensure the sealing inside the heating zone on the other hand, thereby preventing external air from entering the hydrogen furnace and avoiding leakage of the internal protective gas. At the same time, the exhaust pipe is connected to an exhaust hose connected to the air compressor. Due to the elastic material setting of the hose itself, it can move with the exhaust pipe. When the air compressor is started, the protective gas flows out through the exhaust hose, and the air in the pipe can be extracted through the first air pipe through the pressure difference inside the pipe, thereby preventing the pipe from oxidizing during the heating process, thereby improving the product quality.

[0030] (3) A tube tail clamping and sealing mechanism is provided. The tube and the metal plug on the conveyor line are arranged in parallel in sequence. When the tube enters the insulation zone, the second motor starts and drives the first bevel gear to rotate. Through the meshing transmission between the gears, the vertical screw shaft can rotate and the horizontal first rotating shaft can rotate synchronously. Through the action of the spiral transmission, the pressing plate moves downward and presses and clamps the tube to prevent the metal plug from loosening during the connection with the tube. Through the transmission action of the conveyor belt, the resistance rod on the second rotating shaft rotates, and the resistance rod pushes the metal plug to plug the tail of the tube. In this way, when the tube is out of the furnace, the slight positive pressure in the furnace will discharge hydrogen from the head of the tube. The high-temperature hydrogen at the tube mouth will burn when it meets the air. Since the tubes are of different lengths, the flame at the tube mouth of the short tube will cause the outer surface of the long tube to change color. The use of the metal plug can effectively prevent such problems, help the high-temperature reduction of the inner surface of the tube, and ensure the bright effect of the inner surface of the tube after annealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 The structure of the solution heat treatment device for small-diameter seamless pipes of the present invention is shown in FIG. Figure 1 ;

[0033] Figure 2 The structure of the solution heat treatment device for small-diameter seamless pipes of the present invention is shown in FIG. Figure 2 ;

[0034] Figure 3 2 is a front view of a solution heat treatment device for a small-diameter seamless pipe according to the present invention;

[0035] Figure 4 The present invention Figure 1 A magnified image of point A;

[0036] Figure 5 The present invention Figure 3 The enlarged view of point B;

[0037] Figure 6 Schematic diagram of meshing transmission of the central gear of the present invention;

[0038] Figure 7 It is a schematic diagram of the connection between the exhaust pipe and the end cap of the present invention;

[0039] Figure 8 It is a structural schematic diagram of the tube tail clamping and sealing mechanism of the present invention;

[0040] Fig. 9 It is a schematic diagram of the structure of the metal plug of the present invention;

[0041] Fig.10 It is a flow chart of the solution heat treatment method for small-diameter seamless pipes of the present invention;

[0042] Fig.11 It is a schematic diagram of the structure of the conveyor line of the present invention when viewed from above.

[0043] 1. The present invention relates to a hydrogen furnace; a preheating zone; a heating zone; a heat preservation zone; a cooling zone; a conveyor line; a pipe exhaust mechanism; a cylinder; a movable plate; a first motor; a central gear; a first gear plate; a second gear plate; a telescopic curtain plate; a first exhaust pipe; a sealing head; a second air compressor; a first air outlet hose; a first air pipe; a pipe tail clamping and sealing mechanism; a second motor; a first bevel gear; a lead screw shaft; a second bevel gear; a first rotating shaft; a second rotating shaft; a conveyor belt; a first contact rod; a second pressing plate; a lead screw nut; a metal plug; a tapered portion; a fixing block; a second argon tank; a second air pipe; and a second air pipe. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Reference Manual Attached Figure 1 and Figure 2 As shown, the solution heat treatment device for small diameter seamless pipes comprises:

[0046] A hydrogen furnace 1, the hydrogen furnace 1 comprises a preheating zone 2, a heating zone 3, a heat preservation zone 4 and a cooling zone 5; a conveyor line 6, the conveyor line 6 is installed on the frame and extends along a preset direction, for carrying and conveying the plate, and the conveyor line 6 passes through the hydrogen furnace 1 and extends to the outside;

[0047] The pipe exhaust mechanism 7 includes a panel installed on the heating zone 3, the panel and the heating zone 3 are connected by a bracket, both sides of the top of the panel are connected to a movable plate 9 through a cylinder 8, a first motor 10 is fixedly installed on the movable plate 9, the output shaft of the first motor 10 extends to the central gear 11, both ends of the outer wall of the central gear 11 are meshed with a first gear plate 12 and a second gear plate 13 moving in the opposite direction, and the outer wall of the first gear plate 12 and the second gear plate 13 extending therefrom is connected to the corresponding retractable curtain plate 14 On the exhaust pipe 15 and the head 16; wherein, a strip groove connected to the extended ends of the first gear plate 12 and the second gear plate 13 is opened on the panel, and an air compressor 17 adapted thereto is installed on the heating zone 3, and an air outlet hose 18 on the air compressor 17 passes through the heating zone 3 and extends to the exhaust pipe 15, and the edge of the outer wall of the exhaust pipe 15 is connected to the air outlet hose 18 by a threaded connection, and one end of the air outlet hose 18 is connected to a first air pipe 19 extending to the outer wall of the heating zone 3, and a first one-way valve is installed on the first air pipe 19.

[0048] Specifically, the working principle of the technical solution of this patent is as follows:

[0049] By adjusting the hydrogen flow rate, a certain micro-positive pressure is formed in the hydrogen furnace 1, and the micro-positive pressure helps hydrogen to be filled into the tube. The pipes are placed horizontally to ensure that the tail of the pipe mouth is flush, and the pipe conveying speed is adjusted. When the pipes arrive at the designated heating zone 3, the pipe exhaust mechanism 7 can complete the exhaust operation for all pipes in the same row to extract the air in the pipe. After the exhaust operation is completed, the ignition operation is performed at the pipe mouth. At this time, the pipe is full of hydrogen. When the tail of the pipe is at a certain position away from the furnace mouth, the pipe mouth is blocked with a metal plug 31 to ensure that the entire pipe is full of hydrogen, which helps to reduce the inner surface of the pipe at high temperature, ensure the bright effect of the inner surface of the pipe after annealing, and prevent the outer surface of the long pipe from changing color due to the flame of the short pipe mouth when the pipe is out of the furnace.

[0050] refer to Figure 1 , Figure 3 , Figure 8 and Fig. 9 , the tube tail clamping and sealing mechanism 20, the tube tail clamping and sealing mechanism 20 includes a second motor 21 placed on the insulation zone 4, the output shaft of the second motor 21 extends to the first bevel gear 22 inside the insulation zone 4, the outer wall of the first bevel gear 22 is meshed and driven with a second bevel gear 24 fixed on the screw shaft 23, the first rotating shaft 25 and the second rotating shaft 26 at the center of the first bevel gear 22 are connected by a conveyor belt 27, and a resistance rod 28 is fixedly connected to one end of the outer wall of the second rotating shaft 26, and a screw nut 30 fixed on the pressing plate 29 is spirally driven on the screw shaft 23; wherein, the first rotating shaft 25, the second rotating shaft 26 and the pressing plate 29 are all placed on a cover body on the inner wall of the insulation zone 4, and a swing groove connected to the resistance rod 28 is opened at the bottom end of the cover body.

[0051] Specifically, the solution heat treatment device for small-diameter seamless pipes also includes a metal plug 31 placed on the conveyor line 6 and connected to the corresponding pipe. One end of the metal plug 31 is integrally formed with a tapered portion 32, and the other end is provided with a fixed block 33 that contacts and fits with the resistance rod 28.

[0052] The cover body in the insulation area 4 can provide a certain degree of heat insulation for the transmission parts, thereby preventing the normal use of the transmission parts from being affected by excessive temperature. In addition, the above-mentioned transmission parts are all made of high-temperature resistant materials, which can extend the service life of the transmission parts. In addition, the first rotating shaft 25 is provided with a second rotating shaft 26 connected to the conveyor belt 27, so that the resistance rod 28 can rotate freely, thereby preventing the resistance rod 28 and the pressing plate 29 from interfering with each other during the activity, allowing the pressing plate 29 to move freely up and down and the resistance rod 28 to rotate normally.

[0053] A tube tail clamping and sealing mechanism 20 is provided, and the tube and the metal plug 31 on the conveyor line 6 are arranged in parallel in sequence. When the tube enters the heat preservation zone 4, at this time, the second motor 21 starts and drives the rotation of the first bevel gear 22. Through the meshing transmission between the gears, the vertical screw shaft 23 can be rotated and the horizontal first rotating shaft 25 can be rotated synchronously at the same time. Through the action of the spiral transmission, the pressing plate 29 moves downward and presses and clamps the tube to prevent the metal plug 31 from loosening during the connection process with the tube. The friction rod 28 on the second rotating shaft 26 is rotated through the transmission effect of the conveyor belt 27, and the friction rod 28 can push the metal plug 31 to plug the tail of the pipe. In this way, when the pipe is taken out of the furnace, the slightly positive pressure in the furnace will discharge hydrogen from the head of the pipe, and the high-temperature hydrogen at the pipe mouth will burn when it meets the air. Since the pipes are of different lengths, the flame at the mouth of the short pipe will cause the outer surface of the long pipe to change color. The use of the metal plug 31 can effectively prevent such problems, help the high-temperature reduction of the inner surface of the pipe, and ensure the bright effect of the inner surface of the pipe after annealing.

[0054] When the pressing plate 29 moves downward through the spiral transmission, the abutting rod 28 rotates counterclockwise, thereby contacting and fitting with the metal plug 31, and being able to push the metal plug 31 to close and connect with the tail of the tube, so as to prevent the technical problem of discoloration of the outer surface of the long tube due to the flame at the mouth of the short tube when the tube is out of the furnace. At the same time, the integrally formed conical portion 32 on the metal plug 31 can adaptively close and connect tubes of different calibers, thereby improving the applicability of the device. At the same time, the fixing block 33 with a mounting hole at the other end of the metal plug 31 can facilitate the removal of the metal plug 31 after the tail of the tube is out of the furnace.

[0055] refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 An argon tank 34 is supported and connected to the hydrogen furnace 1, and a flow pipe fixed on the regulating valve is connected to the argon tank 34 through a pump body. A second air pipe 35 fixed on the fan is installed on the cooling zone 5, and a second one-way valve is connected to the second air pipe 35. The setting of the one-way valves of the first air pipe 19 and the second air pipe 35 can prevent external air from entering the interior of the hydrogen furnace 1.

[0056] Specifically, the movable plate 9 is provided with an active cavity connected to the center gear 11, and the transmission ratio between the center gear 11 and the first gear plate 12 is kept the same as the transmission ratio between the center gear 11 and the second gear plate 13. The telescopic curtain plate 14 is provided with a positioning hole connected to the extended ends of the first gear plate 12 and the second gear plate 13. As the cylinder 8 and the first motor 10 are started, the exhaust pipe 15 and the head 16 move up and down, and the exhaust pipe 15 and the head 16 clamp or separate the pipes. At the same time, the exhaust pipe 15 exhausts and discharges air from the inside of the pipe through the air compressor 17.

[0057] The coordinated use of the cylinder 8 and the first motor 10 can ensure the normal movement of the pipe and the closed connection between the exhaust pipe 15 and the head 16, so as to effectively extract the air in the pipe to the outside, and can be connected to pipes of different lengths. The exhaust pipe 15 can move synchronously with the air outlet hose 18 on the air compressor 17, and the air inlet on the air compressor 17 extends into the hydrogen furnace 1, which can avoid directly drawing external air into the pipe.

[0058] The bottom end of the second motor 21 is provided with a frame connected to the heat preservation zone 4. When the second motor 21 is started, the pressing plate 29 presses down the pipe, and the resisting rod 28 closes the metal plug 31 at the tail of the pipe by means of rotational positioning.

[0059] A pipe exhaust mechanism 7 is provided. When the pipe enters the heating zone 3, the cylinder 8 is started, so that the exhaust pipe 15 and the end cap 16 are aligned with the pipe, so that the three are kept on the same horizontal plane. Then the first motor 10 is started, which can drive the rotation of the central gear 11. With the help of the meshing transmission of the gears, the exhaust pipe 15 and the end cap 16 move synchronously in the opposite direction, so that it can adapt to the clamping and fixing of pipes of different lengths. The setting of the telescopic curtain plate 14 on the heating zone 3 can ensure the normal movement of the first gear plate 12 and the second gear plate 13 on the one hand, and on the other hand, it can ensure The sealing inside the heating zone 3 prevents external air from entering the hydrogen furnace 1 and also avoids leakage of the internal protective gas. At the same time, the exhaust pipe 15 is connected to an exhaust hose 18 connected to the air compressor 17. Due to the elastic material setting of the hose itself, it can move with the exhaust pipe 15, and start the air compressor 17 to make the protective gas flow out through the exhaust hose 18. Through the pressure difference inside the pipe, the air in the pipe can be extracted through the first air pipe 19, thereby preventing the pipe from being oxidized during the heating process, thereby improving the product quality.

[0060] refer to Fig.10 The solid solution heat treatment method for small diameter seamless pipes comprises the following steps:

[0061] S1, open the feed port in the hydrogen furnace 1, and transport the pipe to the preheating zone 2, the heating zone 3, the insulation zone 4 and the cooling zone 5 in sequence through the conveying line 6;

[0062] S2. Open the regulating valve and ensure that the air in the furnace is exhausted by purging with argon gas. After the purging is completed, close the regulating valve;

[0063] S3. When the temperature in the hydrogen furnace 1 rises to 800°C, turn on the hydrogen input switch on the operation interface, introduce hydrogen and observe the hydrogen flow and pressure in time;

[0064] S4. After hydrogen is introduced, a heating platform is set according to the temperature difference of each zone. During the heating process, the hydrogen flow rate is reasonably controlled, and each zone in the hydrogen furnace 1 is heated to a corresponding temperature;

[0065] S5. When the head of the pipe reaches the heating zone 3, the pipe exhaust mechanism 7 exhausts air from the pipes one by one, and the air in the pipe can be exhausted by utilizing the pressure difference between the pipe and the inside of the heating zone 3;

[0066] S6. When the tail of the tube is two meters away from the furnace mouth, the tail of the tube is plugged by the metal plug 31 in the tube tail clamping and sealing mechanism 20. When the tail of the tube is out of the furnace, the metal plug 31 is removed to complete the solution heat treatment.

[0067] The implementation of the above technical solutions and methods has the following technical effects:

[0068] (1) A slight positive pressure is used in the hydrogen furnace 1 to facilitate the filling of hydrogen into the tube.

[0069] (2) When the pipe reaches the heating zone 3 of the hydrogen furnace 1, the air in the pipe is exhausted to effectively prevent high-temperature oxidation from causing oxidative discoloration and oxidation spots on the inner surface.

[0070] (3) Vacuum the tube to remove the air inside the tube and fill the tube with hydrogen from the furnace.

[0071] (4) After the gas is pumped out, ignite the pipe so that the hydrogen discharged from the pipe burns in the air to prevent the hydrogen from causing harm to the human body.

[0072] (5) When the tail of the tube is about two meters away from the furnace mouth, the tube mouth is blocked with a metal plug 31 to ensure that the entire tube is filled with hydrogen, which helps to reduce the inner surface of the tube at high temperature and ensure the bright effect of the inner surface of the tube after annealing. At the same time, it prevents the outer surface of the long tube from changing color due to the flame at the tube mouth of the short tube when the tube is taken out of the furnace.

[0073] refer to Fig.11For the requirements of safety and practicality, the pipe exhaust mechanism 7 can also be added to the front end of the conveyor line 6 according to actual production needs, so as to complete the exhaust treatment before heat treatment, and the exhaust process is more convenient and the operation is simpler. The air in the pipe can be directly discharged, which is convenient for subsequent processing operations.

[0074] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0075] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A solution heat treatment device for small-diameter seamless pipes, characterized in that: include: A hydrogen furnace (1), the hydrogen furnace (1) comprising a preheating zone (2), a heating zone (3), a heat preservation zone (4) and a cooling zone (5); A conveyor line (6), the conveyor line (6) being installed on the frame and extending in a preset direction, for carrying and conveying the plate, and the conveyor line (6) passing through the hydrogen furnace (1) and extending to the outside; A pipe exhaust mechanism (7), the pipe exhaust mechanism (7) comprising a panel mounted on the heating zone (3), the panel and the heating zone (3) being connected via a bracket, both sides of the top of the panel being connected to a movable plate (9) via a cylinder (8), a first motor (10) being fixedly mounted on the movable plate (9), an output shaft of the first motor (10) extending to a central gear (11), both ends of the outer wall of the central gear (11) being meshed with a first gear plate (12) and a second gear plate (13) that move in opposite directions, the outer walls of the first gear plate (12) and the second gear plate (13) being extended by a telescopic curtain plate (14) and correspondingly connected to the exhaust pipe (15) and the end cap (16); The panel is provided with a strip groove connected to the extended ends of the first gear plate (12) and the second gear plate (13); an air compressor (17) adapted thereto is installed on the heating zone (3); an air outlet hose (18) on the air compressor (17) passes through the heating zone (3) and extends to the exhaust pipe (15); an outer wall edge of the exhaust pipe (15) is connected to the air outlet hose (18) by means of a threaded connection; one end of the air outlet hose (18) is connected to a first air pipe (19) extending to the outer wall of the heating zone (3); a first one-way valve is installed on the first air pipe (19); A tube tail clamping and sealing mechanism (20), the tube tail clamping and sealing mechanism (20) comprising a second motor (21) disposed on the heat preservation zone (4), the output shaft of the second motor (21) extending to a first bevel gear (22) inside the heat preservation zone (4), the outer wall of the first bevel gear (22) meshingly drivingly engaging with a second bevel gear (24) fixed on a lead screw shaft (23), a first rotating shaft (25) and a second rotating shaft (26) at the center of the first bevel gear (22) being connected in transmission via a conveyor belt (27), and a resisting rod (28) being fixedly connected to one end of the outer wall of the second rotating shaft (26), and a lead screw nut (30) fixed on a pressing plate (29) being spirally driven on the lead screw shaft (23); The first rotating shaft (25), the second rotating shaft (26) and the pressing plate (29) are all placed on a cover on the inner wall of the heat preservation area (4), and a swing groove connected to the abutment rod (28) is provided at the bottom end of the cover.

2. The solution heat treatment device for small-diameter seamless pipes according to claim 1, characterized in that: It also includes a metal plug (31) placed on the conveyor line (6) and connected to the corresponding pipe, wherein one end of the metal plug (31) is integrally formed with a tapered portion (32) and the other end is provided with a fixing block (33) that contacts and fits with the abutment rod (28).

3. The solution heat treatment device for small-diameter seamless pipes according to claim 1, characterized in that: An argon tank (34) is supported and connected to the hydrogen furnace (1), and a flow pipeline fixed to the regulating valve is connected to the argon tank (34) via a pump body.

4. The solution heat treatment device for small-diameter seamless pipes according to claim 1, characterized in that: The cooling zone (5) is provided with a second air pipe (35) fixed to the fan, and the second air pipe (35) is connected to a second one-way valve.

5. The solution heat treatment device for small-diameter seamless pipes according to claim 1, characterized in that: The movable plate (9) is provided with a movable cavity connected to the central gear (11), and the transmission ratio between the central gear (11) and the first gear plate (12) is the same as the transmission ratio between the central gear (11) and the second gear plate (13).

6. The solution heat treatment device for small-diameter seamless pipes according to claim 5, characterized in that: The telescopic curtain plate (14) is provided with a positioning hole connected to the extended ends of the first gear plate (12) and the second gear plate (13). When the cylinder (8) and the first motor (10) are started, the exhaust pipe (15) and the sealing head (16) move up and down, and the exhaust pipe (15) and the sealing head (16) clamp or separate the pipe material. At the same time, the exhaust pipe (15) exhausts and discharges air from the inside of the pipe material through the air compressor (17).

7. The solution heat treatment device for small-diameter seamless pipes according to claim 1, characterized in that: A frame connected to the heat preservation zone (4) is provided at the bottom end of the second motor (21). When the second motor (21) is started, the pressing plate (29) presses down on the pipe, and at the same time, the resisting rod (28) closes the metal plug (31) at the tail end of the pipe by means of rotational positioning.

8. A method for solid solution heat treatment of small diameter seamless pipes, applied to a solid solution heat treatment device for small diameter seamless pipes as claimed in any one of claims 1 to 7, characterized in that: The steps include: S1, opening the feed port in the hydrogen furnace (1), and conveying the pipe to the preheating zone (2), the heating zone (3), the insulation zone (4), and the cooling zone (5) in sequence through the conveying line (6); S2. Open the regulating valve and ensure that the air in the furnace is exhausted by purging with argon gas. After the purging is completed, close the regulating valve; S3. When the temperature in the hydrogen furnace (1) rises to 800° C., turn on the hydrogen input switch on the operation interface, introduce hydrogen and observe the hydrogen flow rate and pressure in time; S4. After hydrogen is introduced, a heating platform is set according to the temperature difference of each zone. During the heating process, the hydrogen flow rate is reasonably controlled, and each zone in the hydrogen furnace (1) is heated to a corresponding temperature; S5. When the head of the pipe reaches the heating zone (3), the pipe exhaust mechanism (7) exhausts air from each pipe one by one, and utilizes the pressure difference between the pipe and the inside of the heating zone (3) to exhaust the air in the pipe; S6. When the tail of the tube is two meters away from the furnace mouth, the tail of the tube is plugged by the metal plug (31) in the tube tail clamping and sealing mechanism (20). When the tail of the tube is out of the furnace, the metal plug (31) is removed to complete the solution heat treatment.

9. The solution heat treatment method for small-diameter seamless pipes according to claim 8, characterized in that: The transmission speed of the conveying line (6) for the pipe to enter the hydrogen furnace (1) is set to 0.42 m / min.

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