Online heat treatment device

Abstract

The utility model belongs to the technical field of heat treatment, and discloses an online heat treatment device. The on-line heat treatment device comprises a temperature compensation part, a heat preservation part and a cooling part, wherein the temperature compensation part is used for heating a to-be-treated part at a heat expansion temperature; in the moving direction of the to-be-treated part, the heat preservation part is located on the downstream of the temperature compensation part, the cooling part is located on the downstream of the heat preservation part, the heat preservation part is used for preserving heat of the to-be-treated part at the heat treatment temperature, and the cooling part is used for air cooling or water cooling of the to-be-treated part. According to the on-line heat treatment device, the energy consumption is reduced, the to-be-treated part can reach the heat treatment temperature within a short time, the heat treatment period of the to-be-treated part is shortened, the working efficiency is improved, meanwhile, on-line normalizing treatment or on-line quenching treatment of the to-be-treated part is achieved, and the quality of the to-be-treated part is improved. And the applicability and the flexibility of the online heat treatment device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment, in particular to an on-line heat treatment device. Background Art

[0002] The hot expansion of steel pipes is a processing method of expanding relatively small-diameter steel pipes into large-diameter steel pipes. For higher-grade hot-expanded carbon steel seamless pipes and low-alloy seamless pipes, in order to meet the state and performance requirements of standards and technical agreements, an off-line heat treatment process is generally used to perform off-line normalizing or quenching on the seamless pipes after hot expansion forming, and performance tests are carried out on the heat-treated specimens to ensure that the processed steel pipes can meet the standards.

[0003] When performing off-line heat treatment on seamless steel pipes, it is necessary to reheat the temperature of the steel pipes from low temperature to above the heat treatment temperature, which not only wastes the temperature energy after the hot expansion forming of the steel pipes, increases energy consumption, but also lengthens the heat treatment cycle of the steel pipes; moreover, usually, the normalizing operation and quenching operation of the hot-expanded steel pipes cannot be achieved by one off-line heat treatment device, so that the applicability and flexibility of the off-line heat treatment device are relatively poor. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an on-line heat treatment device, which reasonably utilizes the temperature energy after the hot expansion forming of the workpiece to be processed, saves energy and reduces consumption, can shorten the heat treatment cycle of the workpiece to be processed, and ensures good applicability and flexibility of the on-line heat treatment device.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] The on-line heat treatment device includes:

[0007] A temperature supplement member for heating the workpiece to be processed at the hot expansion temperature;

[0008] A heat preservation member, along the moving direction of the workpiece to be processed, the heat preservation member is located downstream of the temperature supplement member, and the heat preservation member is used to keep the workpiece to be processed at the heat treatment temperature;

[0009] A cooling member, along the moving direction of the workpiece to be processed, the cooling member is located downstream of the heat preservation member, and the cooling member is used to cool the workpiece to be processed by air cooling or water cooling.

[0010] Preferably, along the moving direction of the workpiece to be processed, the temperature supplement member is arranged at intervals downstream of the heating member, and the heating member is used to heat the workpiece to be processed.

[0011] Preferably, the temperature supplement member includes:

[0012] The temperature compensation heating coil can be coaxially wound around the outer periphery of the workpiece to be processed. After thermal expansion heating and deformation, the outer diameter of the workpiece to be processed is D, and the inner diameter of the temperature compensation heating coil is D1, where D1 = D + (80 mm - 100 mm).

[0013] Preferably, the heat insulation member includes:

[0014] A reflective layer, which is annular and can be coaxially arranged on the outer periphery of the workpiece to be processed;

[0015] A heat insulation layer, which is arranged on the outer periphery of the reflective layer.

[0016] Preferably, the heat insulation member further includes:

[0017] An outer protective layer, which is arranged on the outer periphery of the heat insulation layer.

[0018] Preferably, the heat insulation member further includes:

[0019] A wind and water proof ring, which is arranged on the end faces of the reflective layer, the heat insulation layer and the outer protective layer close to the cooling member, and the wind and water proof ring can be sleeved on the outer periphery of the workpiece to be processed.

[0020] Preferably, after thermal expansion heating and deformation, the outer diameter of the workpiece to be processed is D, and the inner diameter of the annular reflective layer is D2, where D2 = D + (60 mm - 100 mm).

[0021] Preferably, the cooling member includes:

[0022] An annular structure, which can be coaxially wound around the outer periphery of the workpiece to be processed. The inner diameter of the annular structure is D3, and after thermal expansion heating and deformation, the outer diameter of the workpiece to be processed is D, where D3 = D + (60 mm - 110 mm).

[0023] Preferably, through holes are provided on the annular structure, and the through holes are used to spray cooling gas or coolant onto the workpiece to be processed.

[0024] Preferably, the axis of the through hole is inclined with respect to the moving direction of the workpiece to be processed.

[0025] Advantages of the present utility model:

[0026] The utility model provides an on-line heat treatment device, which includes a temperature compensation part, a heat preservation part and a cooling part. The temperature compensation part is used to heat the workpiece to be processed, so that the workpiece to be processed at the hot expansion temperature can be directly heated to the heat treatment temperature by the temperature compensation part; the temperature energy of the workpiece after hot expansion forming is reasonably utilized, the energy consumption is reduced, and the purpose of energy conservation and consumption reduction is achieved; and the workpiece to be processed can reach the heat treatment temperature in a relatively short time, the heat treatment cycle of the workpiece to be processed is shortened, and the work efficiency is improved.

[0027] Along the moving direction of the workpiece to be processed, the heat preservation part is located downstream of the temperature compensation part, and the cooling part is located downstream of the heat preservation part, so that the heat preservation part keeps the workpiece to be processed at the heat treatment temperature; then the cooling part cools the workpiece to be processed by air cooling to realize the whole on-line normalizing operation of the workpiece to be processed, or the cooling part cools the workpiece to be processed by water cooling to realize the whole on-line quenching operation of the workpiece to be processed. That is to say, an on-line heat treatment device can be used to realize the on-line normalizing treatment or on-line quenching treatment of the workpiece to be processed, so that the applicability and flexibility of the on-line heat treatment device are better. Brief Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of the on-line heat treatment device provided by an embodiment of the utility model;

[0029] Figure 2 is a sectional view of the heat preservation part provided by an embodiment of the utility model;

[0030] Figure 3 is a partial structural schematic diagram of the cooling part provided by an embodiment of the utility model.

[0031] In the figure:

[0032] 10. On-line heat treatment device; 1. Workpiece to be processed; 2. Heating part; 3. On-line heat treatment part; 31. Temperature compensation part; 32. Heat preservation part; 321. Reflection layer; 322. Heat preservation layer; 323. Outer protection layer; 324. Wind and water proof ring; 33. Cooling part; 331. Ring structure; 332. Through hole. Detailed Description of the Embodiment

[0033] The following further describes the present utility model in detail with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the sake of convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0034] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0036] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0037] As Figure 1 shown, the present utility model provides an on-line heat treatment device 10 for heat-treating a workpiece 1 to be processed after hot expansion deformation. The on-line heat treatment device 10 includes a temperature compensation member 31, a heat preservation member 32, and a cooling member 33. Figure 1 In the figure, the direction A is the moving direction of the workpiece 1 to be processed. Among them, the temperature compensation member 31 is used to heat the workpiece 1 to be processed at the hot expansion temperature; along the moving direction of the workpiece 1 to be processed, the heat preservation member 32 is located downstream of the temperature compensation member 31, and the cooling member 33 is located downstream of the heat preservation member 32; the heat preservation member 32 is used to keep the workpiece 1 at the heat treatment temperature so that the workpiece 1 is kept at the heat treatment temperature for a period of time; the cooling member 33 is used to cool the workpiece 1 by air cooling or water cooling. Among them, the workpiece 1 to be processed may specifically be a seamless steel pipe.

[0038] Compared with the prior art, the online heat treatment device 10 in this embodiment changes the heating position and cooling method of the workpiece 1 to be treated; the online heat treatment device 10 can heat the workpiece 1 at the hot expansion temperature to the heat treatment temperature. Specifically, by using the temperature compensation member 31 to heat the workpiece 1 at the hot expansion temperature to the heat treatment temperature, the temperature energy of the workpiece 1 after hot expansion forming is reasonably utilized, the energy consumption is reduced, and the purpose of energy conservation and consumption reduction is achieved; moreover, the workpiece 1 can reach the heat treatment temperature in a relatively short time, the heat treatment cycle of the workpiece 1 is shortened, and the work efficiency is improved.

[0039] In addition, along the moving direction of the workpiece 1, the heat preservation member 32 is located downstream of the temperature compensation member 31, and the cooling member 33 is located downstream of the heat preservation member 32, so that the heat preservation member 32 keeps the workpiece 1 at the heat treatment temperature, and the cooling member 33 is used for air-cooling or water-cooling the workpiece 1. Furthermore, the online normalizing treatment or online quenching treatment of the workpiece 1 can be realized through an online heat treatment device 10, which improves the applicability and flexibility of the online heat treatment device 10.

[0040] Optionally, in this embodiment, the online heat treatment device 10 can perform online normalizing treatment or online quenching treatment. When performing online normalizing treatment, the workpiece 1 is air-cooled, and when performing online quenching treatment, the workpiece 1 is water-cooled. That is to say, the difference between the two treatment methods lies in the cooling method of the workpiece 1. In other embodiments, the online heat treatment device 10 can also perform online tempering treatment, which is not specifically limited here.

[0041] Furthermore, as Figure 1 shown, along the moving direction of the workpiece 1, the temperature compensation member 31 is arranged at intervals downstream of the heating member 2. The heating member 2 is used to heat the workpiece 1 to make the workpiece 1 reach the hot expansion temperature for hot expansion deformation, and the temperature compensation member 31 can heat the workpiece 1 at the hot expansion temperature to the heat treatment temperature. By arranging the temperature compensation member 31 and the heating member 2 at intervals, the temperature deviation between the temperature compensation member 31 and the heating member 2 during the working process can be avoided, and at the same time, it is ensured that the temperature compensation member 31 can accurately supplement the temperature of the workpiece 1 alone, ensuring the accuracy of heating the workpiece 1 to the heat treatment temperature. It should be noted that the interval distance between the temperature compensation member 31 and the heating member 2 is appropriate to avoid the problem that the temperature of the workpiece 1 drops below the hot expansion temperature due to too large an interval, resulting in an increase in the heating time of the temperature compensation member 31 for the workpiece 1, so as to avoid energy waste.

[0042] It should be noted that the hot expansion temperature of the workpiece to be processed 1 is between Ac1 and Ac3, and the heat treatment temperature of the workpiece to be processed 1 is T, where T = Ac3 + (50°C - 80°C). At this heat treatment temperature, the internal structure of the workpiece to be processed 1 changes, thereby obtaining relatively excellent mechanical properties, hardness, toughness and other characteristics. By precisely controlling the heat treatment temperature, the quality and reliability of the workpiece to be processed 1 can be effectively improved to meet the requirements of different application scenarios.

[0043] Moreover, since it is only necessary to heat the workpiece to be processed 1 by about 50°C - 80°C on the basis of the hot expansion temperature through the temperature compensation part 31, the workpiece to be processed 1 can reach the heat treatment temperature, which can further ensure that the workpiece to be processed 1 reaches the heat treatment temperature in a shorter time, better shortening the heat treatment cycle of the workpiece to be processed 1 and ensuring higher working efficiency.

[0044] Furthermore, as Figure 1 shown, the temperature compensation part 31 includes a temperature compensation heating coil. The temperature compensation heating coil can be coaxially wound around the outer periphery of the workpiece to be processed 1. The outer diameter of the workpiece to be processed 1 after hot expansion heating deformation is D, and the inner diameter of the temperature compensation heating coil is D1, where D1 = D + (80 mm - 100 mm).

[0045] By making the outer diameter D1 of the temperature compensation heating coil slightly larger than the outer diameter D of the workpiece to be processed 1 after hot expansion heating deformation, the heat treatment temperature generated by the temperature compensation heating coil can be more evenly distributed in the gap space between the temperature compensation heating coil and the workpiece to be processed 1, so that the heat in the gap space can be evenly radiated to the workpiece to be processed 1, thereby realizing that the temperature compensation part 31 is more accurate and effective when compensating the temperature of the workpiece to be processed 1. It should be noted that the inner diameter D1 of the temperature compensation heating coil needs to be set according to the outer diameter D of the workpiece to be processed 1 to ensure that the heat treatment temperature generated by the temperature compensation heating coil can be more evenly radiated to the workpiece to be processed 1.

[0046] It should be noted that the temperature compensation heating coil can specifically be an intermediate frequency induction heating coil. The number of turns of the temperature compensation heating coil wound around the workpiece to be processed 1 is 6 - 10 turns. In the moving direction of the workpiece to be processed 1, the length L0 of the temperature compensation heating coil on the workpiece to be processed 1 is 500 mm - 1000 mm, so as to ensure good temperature compensation effect and temperature compensation accuracy of the entire temperature compensation part 31 for the workpiece to be processed 1. Here, the number of turns and length of the temperature compensation heating coil need to be matched and set according to the size of the workpiece to be processed 1 after hot expansion heating deformation, and no specific limitation is made here.

[0047] Furthermore, as Figure 1 and Figure 2As shown, the heat insulation member 32 includes a reflective layer 321 and a heat insulation layer 322. Among them, the reflective layer 321 can be coaxially sleeved on the outer periphery of the workpiece to be processed 1 in a circular ring shape, and the heat insulation layer 322 is arranged on the outer periphery of the reflective layer 321. Among them, the heat insulation layer 322 can be annularly coated on the outer periphery of the reflective layer 321. Such a structural design enables the heat insulation layer 322 to comprehensively cover the reflective layer 321, minimizing the heat dissipation outward through the reflective layer 321, and can maintain the heat treatment temperature of the workpiece to be processed 1, ensuring the transformation of the internal structure of the workpiece to be processed 1 during the heat preservation time and meeting the required performance and state.

[0048] Optionally, as Figure 2 shown, in this embodiment, the reflective layer 321 is rolled and welded from a high-reflectivity high-temperature resistant bright stainless steel plate. Through the reflective layer 321, the heat can be effectively reflected back to the inside of the circular ring-shaped reflective layer 321, thereby improving the heat preservation effect on the workpiece to be processed 1 located inside; at the same time, the high-temperature resistant performance of the reflective layer 321 ensures that the reflective layer 321 can still stably play its role in a high-temperature environment, ensuring the working reliability of the entire reflective layer 321. In other embodiments, the reflective layer 321 is set according to requirements, as long as the high reflectivity and high-temperature resistant performance of the reflective layer 321 can be satisfied.

[0049] Optionally, in this implementation, the heat insulation layer 322 uses heat-insulating materials, such as nano-aerogel, aluminum silicate needled blanket, high-temperature glass wool or any combination of any two of them, preferably a combination of aluminum silicate needled blanket and high-temperature glass wool. When heat attempts to transfer outward from the reflective layer 321, this special material of the heat insulation layer 322 acts like a barrier, greatly slowing down the heat transfer speed. On the premise of heat preservation, the heat insulation layer 322 is easy to install and construct on the reflective layer 321. It should be noted that the heat-insulating material is fixed on the outside of the reflective layer 321 by stainless steel bands to form the heat insulation layer 322.

[0050] Furthermore, the heat insulation member 32 further includes an outer protective layer 323, and the outer protective layer 323 is arranged on the outer periphery of the heat insulation layer 322. The outer protective layer 323 can be annularly coated on the outer periphery of the heat insulation layer 322. It can further improve the heat preservation performance of the heat insulation layer 322, and at the same time prevent the heat insulation layer 322 from being scratched and damaged by sharp objects, ensuring the integrity of the heat insulation layer 322, thereby maintaining its heat preservation performance.

[0051] Optionally, in this embodiment, the outer protective layer 323 is formed by rolling and welding an aluminum plate or a zinc plate into a cylindrical shape. The outer protective layer 323 is adapted to the shape of the reflective layer 321 and can closely fit around the heat insulation layer 322, providing reliable protection for the heat insulation layer 322, ensuring operation safety, reducing the use space, and lowering the cost. In other embodiments, the shape of the outer protective layer 323 is not required and can be set according to specific requirements. It should be noted that the shape of the heat insulation layer 322 can be adaptively adjusted according to the shapes of the outer protective layer 323 and the reflective layer 321, as long as the heat insulation layer 322 can fully fill the space formed between the outer protective layer 323 and the reflective layer 321.

[0052] By sequentially arranging the reflective layer 321, the heat insulation layer 322, and the outer protective layer 323 to form the heat insulation member 32, the workpiece 1 to be processed undergoes the transformation of its structure inside the heat insulation member 32 to meet the usage requirements. It should be noted that the allowable temperature deviation of the heat insulation member 32 is ±10° of the heat treatment temperature, that is, the heat insulation member 32 can keep the workpiece 1 to be processed within the range of ±10° of the heat treatment temperature.

[0053] Furthermore, as Figure 2 shown, the heat insulation member 32 further includes a wind and water proof ring 324. The wind and water proof ring 324 is arranged on the end faces of the reflective layer 321, the heat insulation layer 322, and the outer protective layer 323 close to the cooling member 33, and the wind and water proof ring 324 can be sleeved on the outer periphery of the workpiece 1 to be processed, so as to effectively prevent the compressed air or sprayed water of the cooling member 33 from entering the heat insulation member 32 through the setting of the wind and water proof ring 324, and can better protect the heat insulation member 32.

[0054] Optionally, in this embodiment, the wind and water proof ring 324 is made of high-temperature resistant stainless steel, so that the formed wind and water proof ring 324 is not easily deformed or damaged. In other embodiments, the material of the wind and water proof ring 324 can be specifically set according to requirements.

[0055] Furthermore, as Figure 1 and Figure 2 shown, the inner diameter of the circular reflective layer 321 is D2, and D2 = D + (60 mm - 100 mm). By making the inner diameter D2 of the circular reflective layer 321 larger than the outer diameter D of the workpiece 1 to be processed after hot expansion heating deformation, an annular space is formed between the reflective layer 321 and the workpiece 1, so that the reflected heat of the reflective layer 321 can be evenly distributed in the annular space, improving the heat insulation uniformity of the entire heat insulation member 32 for the workpiece 1 to be processed and avoiding the problems of local overheating or overcooling on the workpiece 1 to be processed.

[0056] Optionally, the inner diameter size of the annular reflective layer 321 is set according to the outer diameter of the workpiece 1 to be processed, and it is only necessary to ensure that the heat of the heat treatment temperature of the workpiece 1 to be processed will not leak outwards from the reflective layer 321.

[0057] It should be noted that, as Figure 1 shown, along the moving direction of the workpiece 1 to be processed, the length of the heat preservation member 32 is L1, the moving speed of the workpiece 1 to be processed is v, and L1 = (30 - 35)v. Through the above settings, when the moving speed v of the workpiece 1 to be processed changes, the length L1 of the heat preservation member 32 will also be adaptively adjusted within the corresponding range accordingly, ensuring that the workpiece 1 to be processed can pass through the heat preservation time of the heat preservation member 32 more accurately, and ensuring the stability and reliability of the entire heat treatment process, so as to avoid the problem of too long or too short heat preservation time of the workpiece 1 to be processed at the heat preservation member 32. It should be noted that the moving speed v of the workpiece 1 to be processed is 150 mm / min - 350 mm / min, and the moving speed v of the workpiece 1 to be processed is determined according to the type of the workpiece 1 to be processed and the actual working conditions.

[0058] Furthermore, as Figure 1 shown, the cooling member 33 includes an annular structure 331, and the annular structure 331 can be spiral and coaxially wound around the outer periphery of the workpiece 1 to be processed. The inner diameter of the annular structure 331 is D3, and D3 = D + (60 mm - 110 mm). By setting the spiral annular structure 331, the contact area between the cooling member 33 and the workpiece 1 to be processed can be increased, thereby increasing the cooling efficiency of the cooling member 33.

[0059] Moreover, the thickness of the workpiece 1 to be processed after thermal expansion heating deformation is t, the number of turns of the annular structure 331 wound around the workpiece 1 to be processed is n, n is rounded up to t / 10, and n ≤ 5; along the moving direction of the workpiece 1 to be processed, the length of the cooling member 33 is L2, and L2 = (50 - 60)n. Through the specific parameter settings of the annular structure 331, the cooling member 33 can be adapted to workpieces 1 to be processed with different sizes, ensuring that the cooling member 33 can effectively cool the workpiece 1 to be processed, and improving the cooling efficiency of the workpiece 1 to be processed and the stability of the cooling effect.

[0060] Optionally, as Figure 3 shown, in this embodiment, the annular structure 331 is a rectangular tube, and the specifications of the rectangular tube can be specifically 40x25 or 60x30. The setting of the rectangular tube can provide stable and efficient support for the cooling member 33 on the workpiece 1 to be processed, and at the same time increase the contact area between the cooling member 33 and the workpiece 1 to be processed. It should be noted that the specifications of the rectangular tube are determined according to the size of the workpiece 1 to be processed. In other embodiments, the specific structure of the annular structure 331 can be set according to requirements.

[0061] Furthermore, asFigure 3 As shown, through holes 332 are provided on the annular structure 331. The through holes 332 are used to spray cooling gas or coolant onto the workpiece 1 to be processed. By providing the through holes 332 on the annular structure 331, and the through holes 332 are used to spray cooling gas or coolant onto the workpiece 1 to be processed, the through holes 332 can serve as the spraying channels for the cooling gas or coolant, directly and accurately guiding the cooling gas or coolant onto the workpiece 1 to be processed, and then air-cooling or water-cooling the workpiece 1. Among them, a plurality of through holes 332 are provided, which can evenly spray the cooling gas or coolant onto the surface of the workpiece 1 to be processed, thereby avoiding local overheating and ensuring a better spraying effect on the workpiece 1 through each through hole 332. It should be noted that, as Figure 3 shown, in this embodiment, the through holes 332 are provided on the inner side surface of the annular structure 331 facing the workpiece 1 to be processed. In other embodiments, the through holes 332 can be provided on other surfaces of the annular structure 331 as long as the temperature reduction of the workpiece 1 to be processed can be achieved.

[0062] Optionally, in this embodiment, the cooling gas is compressed air and the coolant is cooling water. In other embodiments, the types of the cooling gas and the coolant are not limited as long as the temperature reduction effect of the workpiece 1 to be processed can be achieved. It should be noted that, in this embodiment, during the online normalizing treatment, compressed air is introduced into the through holes 332 of the rectangular tube, and the pressure of the compressed air is 0.4 MPa - 0.8 MPa; during the online quenching treatment, circulating cooling water is introduced into the through holes 332 of the rectangular tube, and the pressure of the cooling water is 0.4 MPa - 0.6 MPa. The pressure of the compressed air and the pressure of the cooling water are set according to the size of the workpiece 1 to be processed after hot expansion heating deformation and the actual cooling conditions. Here, no specific limitation is made.

[0063] Furthermore, the axis of the through hole 332 is inclined with respect to the moving direction of the workpiece 1 to be processed, so that the through hole 332 can spray the cooling gas or coolant obliquely in the moving direction towards the workpiece 1 to be processed, thereby avoiding the reverse entry of the compressed air or the cooling water into the heat preservation member 32 and better protecting the heat preservation member 32.

[0064] Optionally, the included angle between the axis of the through hole 332 and the radial direction of the workpiece 1 to be processed is 10°-15°, so as to realize that the axis of the through hole 332 is inclined with respect to the moving direction of the workpiece 1 to be processed. The included angle between the axis of the through hole 332 and the radial direction of the workpiece 1 to be processed can be 10°, 11°, 12°, 13°, 14° or 15°. In this embodiment, the included angle between the axis of the through hole 332 and the radial direction of the workpiece 1 to be processed is preferably 12°. This can not only generate uniform air flow or water flow through the through hole 332 in a specific inclined direction to impact the surface of the workpiece 1 to be processed, achieving an efficient cooling effect, but also effectively prevent the compressed air or cooling water from flowing back into the heat insulation member 32 when spraying out from the through hole 332.

[0065] It should be noted that the diameter of the through hole 332 is 1 mm - 2 mm, and the distance between two adjacent through holes 332 in the circumferential direction of the annular structure 331 is 10 mm - 20 mm. The through holes 332 are arranged in 1 - 3 circles on the inner side surface of the rectangular pipe, and the distance between two adjacent circles is 10 mm - 20 mm. Here, the specific size of the through hole 332 is set according to the size of the workpiece 1 to be processed after hot expansion heating deformation and the actual cooling working condition, so as to form a cooling member 33 for the on-line heat treatment device 10.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. An online heat treatment device, characterized in that, Including: A temperature supplement member (31) for heating a workpiece (1) to be processed at a hot expansion temperature; A heat preservation member (32) which is located downstream of the temperature supplement member (31) along the moving direction of the workpiece (1) to be processed, and the heat preservation member (32) is used for keeping the workpiece (1) to be processed at a heat treatment temperature; A cooling member (33) which is located downstream of the heat preservation member (32) along the moving direction of the workpiece (1) to be processed, and the cooling member (33) is used for air-cooling or water-cooling the workpiece (1) to be processed.

2. The online heat treatment device according to claim 1, characterized in that, Along the moving direction of the workpiece (1) to be processed, the temperature supplement member (31) is arranged at intervals downstream of a heating member (2), and the heating member (2) is used for heating the workpiece (1) to be processed.

3. The on-line heat treatment device according to claim 1, characterized in that, The temperature supplement member (31) includes: A temperature supplement heating coil which can be coaxially wound around the outer periphery of the workpiece (1) to be processed. The outer diameter of the workpiece (1) to be processed after hot expansion heating deformation is D, and the inner diameter of the temperature supplement heating coil is D1, and D1 = D + (80 mm - 100 mm).

4. The on-line heat treatment device according to any one of claims 1-3, characterized in that, The heat preservation member (32) includes: A reflection layer (321) which is circular ring-shaped and can be coaxially arranged on the outer periphery of the workpiece (1) to be processed; A heat preservation layer (322) which is arranged on the outer periphery of the reflection layer (321).

5. The online heat treatment device according to claim 4, characterized in that, The heat preservation member (32) further includes: An outer protection layer (323) which is arranged on the outer periphery of the heat preservation layer (322).

6. The online heat treatment device according to claim 5, characterized in that, The heat preservation member (32) further includes: A wind and water proof ring (324) which is arranged on the end face of the reflection layer (321), the heat preservation layer (322) and the outer protection layer (323) close to the cooling member (33), and the wind and water proof ring (324) can be sleeved on the outer periphery of the workpiece (1) to be processed.

7. The online heat treatment device according to claim 4, characterized in that, The outer diameter of the workpiece (1) to be processed after hot expansion heating deformation is D, and the inner diameter of the circular ring-shaped reflection layer (321) is D2, and D2 = D + (60 mm - 100 mm).

8. The online heat treatment device according to any one of claims 1-3, characterized in that, The cooling member (33) includes: An annular structure (331) which can be coaxially wound around the outer periphery of the workpiece (1) to be processed. The inner diameter of the annular structure (331) is D3, and the outer diameter of the workpiece (1) to be processed after hot expansion heating deformation is D, and D3 = D + (60 mm - 110 mm).

9. The online heat treatment device according to claim 8, characterized in that A through hole (332) is arranged on the annular structure (331), and the through hole (332) is used for spraying cooling gas or cooling liquid to the workpiece (1) to be processed.

10. The online heat treatment device according to claim 9, characterized in that, The axis of the through hole (332) is inclined with respect to the moving direction of the workpiece (1) to be processed.

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