Stainless steel tube heat treatment equipment

Abstract

The invention provides stainless steel pipe heat treatment equipment. The stainless steel pipe heat treatment equipment comprises a steel pipe conveying device, a gas cooling device, a liquid staged cooling device and a ground rail which are connected in sequence, the steel pipe conveying device is used for sequentially conveying stainless steel pipes into the gas cooling device and the liquid graded cooling device; the gas cooling device comprises a closed gas chamber used for receiving gas serving as a cooling medium, the liquid staged cooling device comprises a base, a motor cabin is arranged on one side of the base, a driving motor is arranged in the motor cabin, rollers matched with the ground rail are arranged at the bottom of the base, and the driving motor is in driving connection with the rollers. The liquid staged cooling device further comprises a first liquid chamber and a second liquid chamber which are arranged on the base, a plurality of liquid inlet pipes are arranged at the ends, away from the gas cooling device, of the first liquid chamber and the second liquid chamber, and a plurality of liquid cavities in one-to-one correspondence with the liquid inlet pipes are formed in the first liquid chamber and the second liquid chamber. The ends, close to the gas cooling device, of the first liquid chamber and the second liquid chamber are provided with liquid outlet pipes jointly connected with the multiple liquid cavities.

Description

Technical Field

[0001] The invention relates to the technical field of stainless steel pipe manufacturing process, and in particular to a stainless steel pipe heat treatment device. Background Art

[0002] The reason why stainless steel pipes need to be heat treated is that heat treatment can control the microstructure and physical properties of the material, optimize its mechanical properties, corrosion resistance and processing adaptability. It is reflected in the following aspects: 1. Eliminate processing stress. During cold rolling, cold drawing, welding or bending, residual stress will be generated inside the stainless steel pipe, which may cause deformation, cracking or decreased corrosion resistance. 2. Improve mechanical properties. Cold processing will make stainless steel harden and become brittle. Heat treatment can restore its plasticity and toughness, which is convenient for subsequent processing. 3. Restore corrosion resistance. For example, austenitic stainless steel will precipitate chromium carbide in the range of 500-850℃, causing intergranular corrosion. After heating to 1050-1100℃, it is quickly cooled to dissolve chromium carbide, restore uniform austenite structure, and enhance corrosion resistance. 4. Optimize the microstructure. Stainless steel after casting or hot rolling may have coarse or uneven grains. Heat treatment is used to refine the grains and improve the overall performance of the material.

[0003] However, during the heat treatment of stainless steel pipes, there is a problem that the cooling rate is difficult to control. Too fast or too slow cooling may cause residual stress and uneven structure, thereby reducing the mechanical properties. Summary of the invention

[0004] The present invention aims to solve the above-mentioned technical problems and provides a stainless steel pipe heat treatment equipment.

[0005] The technical solution of the present invention is a stainless steel pipe heat treatment equipment, comprising a steel pipe conveying device, a gas cooling device, a liquid graded cooling device connected in sequence, and a ground rail arranged at the bottom of the steel pipe conveying device, the gas cooling device, and the liquid graded cooling device;

[0006] The steel pipe conveying device includes a plurality of U-shaped segmented rollers, a plurality of the segmented rollers are arranged in a line along the conveying direction, and some of the segmented rollers are arranged inside the gas cooling device. The steel pipe conveying device is used to successively convey the stainless steel pipe into the gas cooling device and the liquid graded cooling device;

[0007] The gas cooling device includes a sealed air chamber, which is used to receive gas as a cooling medium. The liquid graded cooling device includes a base, a motor compartment is provided on one side of the base, a driving motor is provided in the motor compartment, a roller matching the ground rail is provided at the bottom of the base, and the driving motor is drivingly connected to the roller. The liquid graded cooling device also includes a first liquid chamber and a second liquid chamber provided on the base, a plurality of liquid inlet pipes are provided at one end of the first liquid chamber and the second liquid chamber away from the gas cooling device, a plurality of liquid cavities corresponding to the plurality of liquid inlet pipes are formed inside the first liquid chamber and the second liquid chamber, a liquid outlet pipe connecting the plurality of liquid cavities is provided at one end of the first liquid chamber and the second liquid chamber close to the gas cooling device, and the cross-sectional area of ​​the liquid cavity is gradually reduced in a segmented form along the liquid inlet pipe to the liquid outlet pipe. The liquid graded cooling device also includes a connecting pipe inserted into the air chamber, the connecting pipe is connected to the air chamber, the connecting pipe is for a stainless steel pipe to pass through, an air inlet pipe is provided on the connecting pipe, an air outlet pipe is provided on the side of the air chamber close to the steel pipe conveying device, and a temperature sensor is provided at the connecting pipe close to the air inlet pipe;

[0008] Among them, the temperature sensor is used to detect the temperature of the stainless steel pipe before entering the first liquid chamber and the second liquid chamber, and the drive motor adjusts the relative positions of the liquid graded cooling device and the gas cooling device according to the detection result of the temperature sensor to change the actual length of the connecting pipe inserted into the gas chamber.

[0009] As an embodiment, it also includes a base frame, which is arranged below the steel pipe conveying device and the gas cooling device, and the ground rail is arranged on the base frame.

[0010] As an implementation manner, the gas cooling device and the base frame are fixedly connected.

[0011] As an embodiment, a bearing seat is provided at the bottom of the base, a wheel axle is rotatably connected to the bearing seat, the rollers are provided at both ends of the wheel axle, a driven sprocket is also provided on the wheel axle, a driving sprocket is provided on the rotating shaft of the drive motor, and the driving sprocket and the driven sprocket are connected by a chain belt.

[0012] As an implementation manner, the air inlet pipe is provided at two locations, the air outlet pipe is provided at two locations, and the two air outlet pipes are connected to one location through a first main pipe.

[0013] As an implementation manner, the liquid inlet pipes are arranged at four places, the liquid outlet pipe is arranged at one place, and the liquid outlet pipe is folded back to the liquid inlet pipe along the outer sides of the first liquid chamber and the second liquid chamber.

[0014] As an implementation manner, two supports are provided on the outer sides of the first liquid chamber and the second liquid chamber, and the liquid outlet pipe is fixedly connected to the outer sides of the first liquid chamber and the second liquid chamber through the supports.

[0015] As an implementation mode, a circulating water tank is externally connected between the liquid inlet pipe and the liquid outlet pipe.

[0016] As an embodiment, the gas cooling device further comprises a plurality of legs evenly distributed along the length direction of the gas chamber, and the plurality of legs are fixedly connected to the base frame.

[0017] As an implementation manner, the cooling medium connected to the air inlet pipe is nitrogen, and the cooling medium connected to the liquid inlet pipe is water.

[0018] Compared with the prior art, the present invention has the beneficial effect that the stainless steel pipe heat treatment equipment realizes gas cooling and liquid graded cooling for high-temperature stainless steel pipes by setting a gas cooling device and a liquid graded cooling device. First, gas is used as a cooling medium, and the heat is taken away by gas flow, and the cooling rate is relatively slow to cope with the high-temperature stainless steel pipe whose temperature has not yet dropped. Secondly, liquid is used as a cooling medium, and the flow rate of the cooling medium per unit time is changed by the size change of each liquid cavity after segmentation, so as to adjust the cooling rate in stages and avoid material defects caused by too fast or too slow cooling. In the intermediate connection link where the gas cooling device is used as the high-temperature zone and the liquid graded cooling device is used as the low-temperature zone, a temperature sensor is set, and the current actual temperature is obtained according to the real-time detection of the temperature of the stainless steel pipe, so as to dynamically adjust the liquid graded cooling device according to the actual temperature, so that the liquid graded cooling device is positioned in front or behind in the length direction of the stainless steel pipe. In summary, the stainless steel pipe heat treatment equipment combines the advantages of gas cooling and liquid cooling, uses gas cooling in the high-temperature stage, switches to liquid graded cooling in the medium and low temperature stage, and uses temperature sensors and drive motors to accurately control the switching when the cooling medium is switched. This significantly improves the quality and efficiency of the heat treatment process and improves the mechanical properties of the stainless steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A first structural schematic diagram of a stainless steel pipe heat treatment device provided in an embodiment of the present invention;

[0020] Figure 2 A second structural schematic diagram of a stainless steel pipe heat treatment device provided in an embodiment of the present invention;

[0021] Figure 3 A third structural schematic diagram of a stainless steel pipe heat treatment device provided in an embodiment of the present invention;

[0022] Figure 4This is a fourth structural schematic diagram of the stainless steel pipe heat treatment equipment provided in an embodiment of the present invention.

[0023] In the figure: 1. steel pipe conveying device; 2. gas cooling device; 3. liquid graded cooling device; 4. ground rail; 5. segmented roller; 6. air chamber; 7. base; 8. motor compartment; 9. driving motor; 10. roller; 11. first liquid chamber; 12. second liquid chamber; 13. liquid inlet pipe; 14. liquid outlet pipe; 15. connecting pipe; 16. air inlet pipe; 17. air outlet pipe; 18. temperature sensor; 19. base frame; 20. bearing seat; 21. wheel axle; 22. driven sprocket; 23. driving sprocket; 24. chain belt; 25. first main pipe; 26. support; 27. support foot. DETAILED DESCRIPTION

[0024] The above and other embodiments and advantages of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0025] In one embodiment, Figures 1 to 4 shown.

[0026] The stainless steel pipe heat treatment equipment provided in this embodiment includes a steel pipe conveying device 1, a gas cooling device 2, a liquid graded cooling device 3 connected in sequence, and a ground rail 4 arranged at the bottom of the steel pipe conveying device 1, the gas cooling device 2, and the liquid graded cooling device 3; the steel pipe conveying device 1 includes a plurality of U-shaped segmented rollers 5, and the plurality of segmented rollers 5 are arranged in a line along the conveying direction, and some of the segmented rollers 5 are arranged in the gas cooling device 2. The steel pipe conveying device 1 is used to successively convey the stainless steel pipe into the gas cooling device 2 and the liquid graded cooling device 3; the gas cooling device 2 includes a closed air chamber 6, and the air chamber 6 is used to access the gas as a cooling medium. The liquid graded cooling device 3 includes a base 7, a motor cabin 8 is provided on one side of the base 7, and a driving motor 9 is provided in the motor cabin 8. A roller 10 cooperating with the ground rail 4 is provided at the bottom of the base 7, and the driving motor 9 is drivingly connected to the roller 10. The liquid graded cooling device 3 also includes a first liquid chamber 11 and a second liquid chamber 12 arranged on the base 7, and the first liquid chamber 11 and the second liquid chamber 12 are connected to the bottom of the base 7. A plurality of liquid inlet pipes 13 are provided at one end away from the gas cooling device 2, and a plurality of liquid cavities corresponding to the plurality of liquid inlet pipes 13 are formed inside the first liquid chamber 11 and the second liquid chamber 12. A liquid outlet pipe 14 connecting the plurality of liquid cavities is provided at one end of the first liquid chamber 11 and the second liquid chamber 12 close to the gas cooling device 2. The cross-sectional area of ​​the liquid cavity gradually decreases in a segmented form along the liquid inlet pipe 13 to the liquid outlet pipe 14. The liquid graded cooling device 3 also includes a connecting pipe 15 inserted into the gas chamber 6. The connecting pipe 15 is connected to the gas chamber 6, and the connecting pipe 15 is for the stainless steel pipe to pass through. An air inlet pipe 16 is provided on the connecting pipe 15. An air outlet pipe 17 is provided on the side of the gas chamber 6 close to the steel pipe conveying device 1. A temperature sensor 18 is provided at the connecting pipe 15 close to the air inlet pipe 16; wherein the temperature sensor 18 is used to detect the temperature of the stainless steel pipe before entering the first liquid chamber 11 and the second liquid chamber 12. The drive motor 9 adjusts the relative position of the liquid graded cooling device 3 and the gas cooling device 2 according to the detection result of the temperature sensor 18 to change the actual length of the connecting pipe 15 inserted into the gas chamber 6.

[0027] In this embodiment, the uniqueness of the stainless steel pipe heat treatment equipment lies in its innovative and effective combination of the gas cooling device 2 and the liquid graded cooling device 3, thereby creating a precise cooling solution for high-temperature stainless steel pipes. Because heat treatment is a crucial process in the manufacturing process of stainless steel pipes, it greatly affects the mechanical properties and product quality of stainless steel pipes. If the cooling rate is not properly controlled, such as too fast or too slow cooling, it may cause residual stress and uneven organization, thereby reducing the mechanical properties.

[0028] The cooling process of the stainless steel pipe heat treatment equipment is divided into two key stages. The first stage is gas cooling, which mainly deals with stainless steel pipes with extremely high temperatures. After the high-temperature stainless steel pipe has just undergone high-temperature treatment, the internal structure is in an extremely active state. If the cooling rate is too fast at this time, it is easy to cause huge thermal stress inside the stainless steel pipe, thereby causing serious quality problems such as cracks and deformation. Therefore, the equipment chooses to use gas as a cooling medium to start the cooling process. When the high-temperature stainless steel pipe is transported to the working area of ​​the gas cooling device 2, the gas flows around the stainless steel pipe at a high speed under the drive of the air duct system, so that the gas can evenly wrap the stainless steel pipe, so that the heat of each part of the surface of the stainless steel pipe can be efficiently taken away, and the above is carried out in the air chamber 6. Since the specific heat capacity of the gas is relatively small and the heat transfer efficiency is relatively low, the cooling rate is relatively slow and gentle. In this way, the temperature of the stainless steel pipe can be gradually reduced, avoiding the thermal stress problem caused by the sudden drop in temperature. After the gas cooling completes the initial cooling task, although the temperature of the stainless steel pipe has dropped, it still needs to be further cooled to a temperature range suitable for processing or use. At this time, the equipment enters the second cooling stage-liquid graded cooling. Unlike gas cooling, liquid has a higher specific heat capacity and better heat transfer performance, and can provide a faster cooling rate. The liquid graded cooling device 3 of the device adopts a segmented design, which divides the entire cooling area into several independent liquid chambers. By accurately controlling the size changes of each liquid chamber, the flow rate of the cooling medium per unit time, that is, the flow rate, can be cleverly changed. In the front section area where the temperature of the stainless steel pipe is relatively high, the size of the liquid chamber is designed to be smaller, thereby forming a higher flow rate, so that a faster cooling rate can be achieved and more heat can be quickly taken away. As the temperature of the stainless steel pipe gradually decreases, the subsequent liquid chamber size gradually increases, thereby forming a lower flow rate, so that the cooling rate gradually slows down, and the above is carried out in the first liquid chamber 11 and the second liquid chamber 12. This method of adjusting the cooling rate in stages is extremely important. It can accurately control the cooling process according to the characteristic requirements of the stainless steel pipe in different temperature ranges, avoiding the martensitic phase transformation of the stainless steel pipe due to excessive cooling and brittleness, or the microstructure of the stainless steel pipe cannot meet the expected requirements due to excessive cooling. Material defects such as.

[0029] More importantly, in order to ensure that the transition process from the gas cooling device 2 (high temperature zone) to the liquid graded cooling device 3 (low temperature zone) can be seamless and accurate, the device is equipped with a highly sensitive temperature sensor 18 in the intermediate connection link between the two cooling areas. The sensor will transmit the detected temperature data of the stainless steel pipe to the intelligent control system of the device. The intelligent control system accurately calculates the current state of the stainless steel pipe and the most suitable cooling parameters based on the pre-set temperature-position mapping model and the received real-time temperature data. After that, the control system will issue instructions to the liquid graded cooling device 3 to dynamically adjust its position in the length direction of the stainless steel pipe. That is, dynamically adjust the length of the connecting pipe 15 actually inserted into the air chamber 6. If it is detected that the temperature of the stainless steel pipe is still high, the liquid graded cooling device 3 will automatically be set back a certain distance to extend the effective length of the gas cooling device 2; conversely, if the temperature of the stainless steel pipe is lower than the ideal range, the liquid graded cooling device 3 will be advanced to allow the stainless steel pipe to be liquid-cooled in advance, ultimately achieving the purpose of accurately controlling the cooling curve.

[0030] Because the air inlet pipe 16 of the gas cooling device 2 is arranged in the liquid graded cooling device 3, and the air outlet pipe 17 is arranged in the gas cooling device 2, the effective length of the gas cooling device 2 can be dynamically adjusted by the driving motor 9. Through the above-mentioned innovative cooling method, not only the quality and efficiency of the heat treatment process are significantly improved, so that the stainless steel pipe can obtain a more ideal organizational structure and performance, but also the mechanical properties of the stainless steel pipe are fundamentally improved. The stainless steel pipe after heat treatment by the equipment performs better in hardness, toughness, corrosion resistance and other aspects.

[0031] In one embodiment, Figure 2 shown.

[0032] The stainless steel pipe heat treatment equipment provided in this embodiment further includes a base frame 19, which is arranged below the steel pipe conveying device 1 and the gas cooling device 2, and the ground rail 4 is arranged on the base frame 19. The gas cooling device 2 and the base frame 19 are fixedly connected.

[0033] In this embodiment, the base frame 19 is located below the steel pipe conveying device 1 and the gas cooling device 2, and plays a role in supporting the entire device. The ground rail 4 is arranged on the base frame 19 to guide the moving path of the liquid graded cooling device 3 to ensure the smooth movement process. In addition, the ground rail is made of wear-resistant material to adapt to frequent movement and heavy load conditions.

[0034] In one embodiment, Figure 4 shown.

[0035] The stainless steel pipe heat treatment equipment provided in this embodiment has a bearing seat 20 at the bottom of the base 7, a wheel axle 21 is rotatably connected to the bearing seat 20, rollers 10 are arranged at both ends of the wheel axle 21, a driven sprocket 22 is also arranged on the wheel axle 21, a driving sprocket 23 is arranged on the rotating shaft of the driving motor 9, and the driving sprocket 23 and the driven sprocket 22 are connected by a chain belt 24.

[0036] In this embodiment, a feasible implementation method of a transmission system is provided. The bottom of the base is designed with a bearing seat 20, which is the key supporting part of the entire wheel-axle system. A wheel axle 21 is rotatably connected to the bearing seat 20, and rollers 10 are respectively installed at both ends of the wheel axle 21, thereby ensuring the stability and flexibility of the system. A driven sprocket 22 is also provided on the wheel axle 21, and a driving sprocket 23 is provided on the rotating shaft of the driving motor 9. The two sprockets are connected by a chain belt 24 to form a complete transmission system. The sprocket transmission system has the advantages of simple structure, high efficiency, and adaptability to long-distance transmission. Through the connection of the chain belt, efficient power transmission can be achieved, while ensuring the stability and reliability of the transmission system.

[0037] In one embodiment, Figure 3 shown.

[0038] The stainless steel pipe heat treatment equipment provided in this embodiment has two air inlet pipes 16 and two air outlet pipes 17 , which are connected to one by a first manifold 25 .

[0039] In this embodiment, the design of the air inlet pipe 16 and the air outlet pipe 17 of the stainless steel pipe heat treatment equipment is intended to ensure smooth gas flow during the heat treatment process, thereby improving heating efficiency and product quality. The air inlet pipe 16 is set at two locations, and this design helps to evenly introduce gas into the interior of the heat treatment equipment to ensure the uniformity and efficiency of the heating process. The air outlet pipe 17 is also set at two locations. This design not only improves the gas discharge efficiency, but also helps to reduce heat accumulation inside the equipment and maintain the normal operating temperature of the equipment. The two air outlet pipes 17 are connected to one place through the first main pipe 25. This design helps to concentrate the heated gas and avoid the problem of uneven temperature control caused by gas dispersion, thereby improving the heating effect and production efficiency.

[0040] In one embodiment, Figure 2 shown.

[0041] The stainless steel pipe heat treatment equipment provided in this embodiment has four liquid inlet pipes 13 and one liquid outlet pipe 14, and the liquid outlet pipe 14 is folded back to the liquid inlet pipe 13 along the outer sides of the first liquid chamber 11 and the second liquid chamber 12. A circulating water tank is externally connected between the liquid inlet pipe 13 and the liquid outlet pipe 14.

[0042] In this embodiment, the liquid inlet pipe 13 is designed to be four-point, and this design helps to achieve a more uniform heat distribution and ensure uniform heat dissipation of the stainless steel pipe during the heat treatment process. The liquid outlet pipe 14 is set to one point, and this design can reduce heat loss and improve the overall heat treatment efficiency. The liquid outlet pipe 14 is folded back to the liquid inlet pipe 13 along the outside of the first liquid chamber 11 and the second liquid chamber 12. This design helps to form a more effective heat cycle and further improve the heating effect. A circulating water tank is connected between the liquid inlet pipe 13 and the liquid outlet pipe 14, which not only helps to maintain the circulation of hot water, but also effectively recovers heat and reduces energy consumption.

[0043] In one embodiment, Figure 3 shown.

[0044] The stainless steel pipe heat treatment equipment provided in this embodiment has two supports 26 disposed on the outer sides of the first liquid chamber 11 and the second liquid chamber 12 , and the liquid outlet pipe 14 is fixedly connected to the outer sides of the first liquid chamber 11 and the second liquid chamber 12 through the supports 26 .

[0045] In this embodiment, the design and function of the stainless steel pipe heat treatment equipment ensures the accuracy and efficiency of its effective treatment of stainless steel materials at high temperatures. In particular, two supports 26 are provided on the outside of the first liquid chamber 11 and the second liquid chamber 12 of the equipment, and the liquid outlet pipe 14 is fixedly connected to the outside of the first liquid chamber and the second liquid chamber through these supports. This structural design not only enhances the stability of the equipment, but also facilitates maintenance and replacement of components.

[0046] In one embodiment, Figure 2 shown.

[0047] The stainless steel pipe heat treatment equipment provided in this embodiment, wherein the gas cooling device 2 further comprises a plurality of legs 27 evenly distributed along the length direction of the gas chamber 6 , and the plurality of legs 27 are fixedly connected to the base frame 19 .

[0048] In this embodiment, a number of legs 27 are evenly distributed along the length of the air chamber. These legs 27 not only support the entire device, but also effectively fix the base frame 19 to ensure the stability of the device during operation. The legs 27 are fixedly connected to the base frame 19, which not only enhances the stability of the structure, but also facilitates daily maintenance and replacement of parts.

[0049] In one embodiment, Figure 2 shown.

[0050] In the stainless steel pipe heat treatment equipment provided in this embodiment, the cooling medium connected to the air inlet pipe 16 is nitrogen, and the cooling medium connected to the liquid inlet pipe 13 is water.

[0051] In this embodiment, water, as a commonly used cooling medium, has a high thermal conductivity and can effectively absorb and transfer heat, thereby quickly reducing the heat treatment temperature of the stainless steel pipe. Nitrogen has good resistance to media such as air, water, acid, alkali, and salt, and is suitable for most medium to high requirements.

[0052] The above specific implementation methods further describe the invention purpose, technical solutions, and beneficial effects of the present invention in detail. It should be understood that the above are only specific implementation methods of the present invention and are not intended to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stainless steel pipe heat treatment equipment, characterized in that: It comprises a steel pipe conveying device (1), a gas cooling device (2), a liquid graded cooling device (3) which are connected in sequence, and a ground rail (4) arranged at the bottom of the steel pipe conveying device (1), the gas cooling device (2), and the liquid graded cooling device (3); The steel pipe conveying device (1) comprises a plurality of U-shaped segmented rollers (5), wherein the plurality of segmented rollers (5) are arranged in a line along the conveying direction, and some of the segmented rollers (5) are arranged inside the gas cooling device (2). The steel pipe conveying device (1) is used to successively convey the stainless steel pipe into the gas cooling device (2) and the liquid graded cooling device (3); The gas cooling device (2) comprises a sealed air chamber (6), wherein the air chamber (6) is used to receive a gas as a cooling medium. The liquid grading cooling device (3) comprises a base (7), wherein a motor compartment (8) is provided on one side of the base (7), wherein a driving motor (9) is provided in the motor compartment (8), wherein a roller (10) cooperating with the ground rail (4) is provided at the bottom of the base (7), wherein the driving motor (9) is drivingly connected to the roller (10), and wherein the liquid grading cooling device (3) further comprises a first liquid chamber (11) and a second liquid chamber (12) provided on the base (7), wherein a plurality of liquid inlet pipes (13) are provided at one end of the first liquid chamber (11) and the second liquid chamber (12) away from the gas cooling device (2), wherein the interiors of the first liquid chamber (11) and the second liquid chamber (12) form a liquid inlet pipe (13) which is connected to the ground rail (4). A plurality of liquid inlet pipes (13) correspond to a plurality of liquid chambers one by one, a liquid outlet pipe (14) which is connected to the plurality of liquid chambers is provided at one end of the first liquid chamber (11) and the second liquid chamber (12) close to the gas cooling device (2), and a cross-sectional area of ​​the liquid chamber gradually decreases in a segmented manner from the liquid inlet pipe (13) to the liquid outlet pipe (14), the liquid graded cooling device (3) further comprises a connecting pipe (15) inserted into the gas chamber (6), the connecting pipe (15) is connected to the gas chamber (6), a stainless steel pipe passes through the connecting pipe (15), an air inlet pipe (16) is provided on the connecting pipe (15), an air outlet pipe (17) is provided on a side of the gas chamber (6) close to the steel pipe conveying device (1), and a temperature sensor (18) is provided on the connecting pipe (15) close to the air inlet pipe (16); The temperature sensor (18) is used to detect the temperature of the stainless steel pipe before entering the first liquid chamber (11) and the second liquid chamber (12), and the drive motor (9) adjusts the relative positions of the liquid grading cooling device (3) and the gas cooling device (2) according to the detection result of the temperature sensor (18) to change the length of the connecting pipe (15) actually inserted into the gas chamber (6).

2. The stainless steel pipe heat treatment equipment according to claim 1, characterized in that: It also includes a base frame (19), wherein the base frame (19) is arranged below the steel pipe conveying device (1) and the gas cooling device (2), and the ground rail (4) is arranged on the base frame (19).

3. The stainless steel pipe heat treatment equipment according to claim 2, characterized in that: The gas cooling device (2) and the base frame (19) are fixedly connected.

4. The stainless steel pipe heat treatment equipment according to claim 1, characterized in that: A bearing seat (20) is provided at the bottom of the base (7), a wheel shaft (21) is rotatably connected to the bearing seat (20), the roller (10) is provided at both ends of the wheel shaft (21), a driven sprocket (22) is also provided on the wheel shaft (21), a driving sprocket (23) is provided on the rotating shaft of the driving motor (9), and the driving sprocket (23) and the driven sprocket (22) are connected via a chain belt (24).

5. The stainless steel pipe heat treatment equipment according to claim 1, characterized in that: The air inlet pipe (16) is provided at two locations, the air outlet pipe (17) is provided at two locations, and the two air outlet pipes (17) are connected to one location through a first main pipe (25).

6. The stainless steel pipe heat treatment equipment according to claim 1, characterized in that: The liquid inlet pipe (13) is arranged at four locations, the liquid outlet pipe (14) is arranged at one location, and the liquid outlet pipe (14) is folded back to the liquid inlet pipe (13) along the outer sides of the first liquid chamber (11) and the second liquid chamber (12).

7. The stainless steel pipe heat treatment equipment according to claim 6, characterized in that: Two supports (26) are provided on the outside of the first liquid chamber (11) and the second liquid chamber (12), and the liquid outlet pipe (14) is fixedly connected to the outside of the first liquid chamber (11) and the second liquid chamber (12) through the supports (26).

8. The stainless steel pipe heat treatment equipment according to claim 6, characterized in that: A circulating water tank is externally connected between the liquid inlet pipe (13) and the liquid outlet pipe (14).

9. The stainless steel pipe heat treatment equipment according to claim 1, characterized in that: The gas cooling device (2) further comprises a plurality of supporting legs (27) evenly distributed along the length direction of the gas chamber (6), and the plurality of supporting legs (27) are fixedly connected to the base frame (19).

10. The stainless steel pipe heat treatment equipment according to claim 1, characterized in that: The cooling medium connected to the air inlet pipe (16) is nitrogen, and the cooling medium connected to the liquid inlet pipe (13) is water.

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