A continuous heat treatment device for manufacturing automobile steel pipes

Abstract

This invention discloses a continuous heat treatment apparatus for automotive steel pipe manufacturing, relating to the field of automotive steel pipe heat treatment technology. It includes a quenching device with a circulation section for mixing quenching fluid; a lifting guide for guiding the automotive steel pipe downwards; and a gas-insulated bending-resistant component installed on the lifting guide. By employing the gas-insulated bending-resistant component, real-time gas pressure can be supplied to protect the automotive steel pipe during quenching, preventing water ingress and the formation of a vapor film on the inner wall of the steel pipe, thus preventing uneven hardness. This invention is applicable to thick-walled steel pipes, addressing the problems of current continuous heat treatment apparatuses for automotive steel pipe manufacturing being inconvenient for maintaining pressure inside the steel pipe and having a high bending rate after quenching.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology for automotive steel pipes, specifically a continuous heat treatment apparatus for manufacturing automotive steel pipes. Background Technology

[0002] In actual automotive steel pipe manufacturing, multiple heat treatment processes are typically required to ensure the pipe's structural strength meets standards. Quenching improves the steel's hardness and wear resistance. Tempering following quenching allows the steel to achieve the necessary balance between hardness and strength. Automotive steel pipes usually require a dedicated quenching tank. A circulating pump in the tank circulates the quenching fluid, breaking up the vapor film generated when the high-temperature steel pipe is lowered into the quenching fluid, thus ensuring quenching quality. However, current continuous heat treatment equipment for automotive steel pipe manufacturing struggles to guide the steel pipe's precise quenching process. Traditional lifting tools have poor positioning accuracy, and during the quenching process, it is difficult to... In order to provide gas protection for the inside of automotive steel pipes, when the steel pipes are placed in the quenching liquid in a traditional way, air bubbles and vapor films are easily formed inside the steel pipes. The quenching liquid cannot fully fill the inside of the steel pipes, resulting in poor cooling uniformity, large axial temperature difference, and high bending rate of the steel pipes after quenching. At the same time, if the circulation pump is turned on too late or malfunctions, it is difficult for the operator to visually judge the turbulence effect of the quenching liquid. If the steel pipes are directly placed into the quenching liquid with poor turbulence, it will seriously affect the quenching quality. Moreover, the existing device cannot restrict the operator to placing the steel pipes for quenching only when the quenching liquid is turbulent.

[0003] Therefore, the present invention proposes a continuous heat treatment apparatus for automobile steel pipe manufacturing. Summary of the Invention

[0004] The purpose of this invention is to provide a continuous heat treatment apparatus for manufacturing automotive steel pipes, in order to solve the problems mentioned in the background art, such as the inconvenience of pressure protection inside the automotive steel pipes and the high bending rate of the steel pipes after quenching.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a continuous heat treatment apparatus for manufacturing automotive steel pipes, comprising a quenching device, wherein a circulation section is installed on the quenching device for mixing quenching fluid; a lifting guide is installed on the quenching device for guiding the automotive steel pipe downward; a gas-insulated bending-resistant component is installed on the lifting guide; a pressure relief component is installed on the lifting guide; the pressure relief component is aligned with the gas-insulated bending-resistant component; two tumbling limiting components are installed inside the quenching device; the tumbling limiting components are used to ensure uniform mixing of the quenching fluid; the quenching device includes a quenching pool and a supply pipe, wherein the supply pipe is fixedly installed on the side of the quenching pool; the supply pipe has an L-shaped structure; and quenching fluid is stored in the quenching pool.

[0006] Preferably, the quenching device further includes: sliding mounting strips, and sliding mounting strips are fixedly installed on both sides of the quenching pool by bolts; the quenching pool is placed in a ground tank.

[0007] Preferably, the circulation section includes: an external guide shell, a circulation pump, a discharge pipe, and an overflow pipe. The external guide shell is fixedly installed on the top of the quenching tank. A gap is provided between the inner side of the external guide shell and the outer side of the quenching tank. The top of the external guide shell is higher than the quenching tank. Two circulation pumps are fixedly installed on the external guide shell, and the two circulation pumps have the same structure. The outlet pipe of the circulation pump is fixedly installed at the bottom of the inner side of the quenching tank. The inlet pipe of the circulation pump is fixed at the bottom of the inner side of the quenching tank and passes through the quenching tank. The inlet pipe of the circulation pump is located above the outlet pipe. A discharge pipe is fixedly installed on the outlet pipe of the circulation pump. The discharge pipe is fixedly installed at the bottom of the inner side of the quenching tank, and a row of through holes is located at the top of the discharge pipe. An overflow pipe is fixedly installed on the side of the external guide shell. The overflow pipe is used to discharge the quenching liquid overflowing from the quenching tank.

[0008] Preferably, the lifting guide includes: a lifting mounting frame and a reset spring, wherein the lifting mounting frame is slidably mounted on two sliding mounting strips on both sides; the lifting mounting frame is used to guide the automotive steel pipe to move downward; two reset springs are fixedly mounted on both sides of the lifting mounting frame, and the top ends of the four reset springs are fixedly connected to the inside of the quenching pool.

[0009] Preferably, the lifting guide further includes: limiting teeth, two limiting teeth are fixedly installed on both sides of the lifting mounting frame, and the limiting teeth protrude from both sides of the lifting mounting frame.

[0010] Preferably, the gas-insulated bending-resistant component includes: a sliding mounting block, an air supply pipe, an air supply tension spring, a closing ring, and a closing spring. The sliding mounting block is fixedly mounted on the lifting mounting frame by bolts. The air supply pipe is slidably mounted on the sliding mounting block. An air supply tension spring is provided on the outer side of the air supply pipe. One end of the air supply tension spring is fixedly connected to the air supply pipe, and the other end of the air supply tension spring is fixedly mounted on the sliding mounting block. A closing ring is fixedly mounted on the inner side of the air supply pipe, and the inner side of the closing ring has an inclined structure. A closing spring is sleeved on the air supply pipe.

[0011] Preferably, the gas-insulated bending-resistant component further includes: an air inlet hose, a handle, an air-sealing core column, and a docking cover. The air inlet hose is fixedly installed on the air supply pipe and is connected to an external air pump. A handle is rotatably installed on the air supply pipe. The air-sealing core column is located inside the air supply pipe. The outer side of the end of the air-sealing core column has a tapered inclined surface structure. The inclined surface at the end of the air-sealing core column can adhere to a sealing ring. A docking cover is fixedly installed on the air-sealing core column. The docking cover is slidably sleeved on the air supply pipe. One end of the sealing spring is fixedly connected to a sliding mounting block, and the other end of the sealing spring is fixedly connected to the docking cover. The docking cover has a ring of through holes. The end of the docking cover has an inclined surface structure.

[0012] Preferably, the pressure relief component includes: a fixed mounting block and a docking cylinder, wherein the fixed mounting block is fixedly mounted on the lifting mounting frame by bolts; the docking cylinder is fixedly mounted on the fixed mounting block; the end of the docking cylinder has a beveled structure; and the docking cylinder is aligned with the docking cover.

[0013] Preferably, the tumbling limiting component includes: a swing arm and a rotating shaft. Two swing arms are provided, and the two swing arms are respectively located inside the quenching pool. Two rotating shafts are fixedly installed inside the quenching pool, and swing arms are rotatably installed on the two rotating shafts respectively.

[0014] Preferably, the tumbling limiting component further includes: a flap and a torsion spring; the flap is fixedly installed on the two swing arms; a torsion spring is respectively sleeved on the two rotating shafts, and one end of the two torsion springs is fixedly connected to the swing arm, and the other end of the two torsion springs is fixedly connected to the rotating shaft; the flap elastically fits against the side of the lifting mounting frame, and the flap is located below the limiting tooth; the flap is installed at an angle.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention employs a gas-insulated bending-resistant component, which provides real-time gas pressure protection for automotive steel pipes during quenching. This prevents water ingress and the formation of a vapor film on the inner wall of the steel pipe, thus avoiding uneven hardness and easy bending deformation. It is applicable to thick-walled steel pipes, achieving a performance match of external hardness and internal toughness. This meets the requirements of impact resistance, fatigue resistance, and fracture resistance for automotive steel pipes, ensuring consistent quenching temperature along the axial direction of the steel pipe while allowing the quenching liquid to gradually cool the steel pipe radially inward.

[0016] The use of tumbling limiters can automatically detect the normal tumbling of the quenching liquid in the quenching tank, which can ensure the quenching quality and avoid the situation where the automobile steel pipe is directly lowered due to the late start of the circulation pump or the low water spray head caused by factors such as blockage or failure of the circulation pump, which affects the quenching quality. The tumbling stop limit teeth can be used to achieve automatic control, prompting the staff to wait for the drainage head of the circulation pump to reach the standard or to repair the circulation pump before quenching.

[0017] The circulation section accelerates the circulation and turbulence of the quenching fluid, ensuring quenching quality. The turbulence of the quenching fluid ensures thorough mixing and effectively breaks up the vapor film, guaranteeing quenching quality. The lifting guide can guide the automotive steel pipe from its horizontal position to move vertically downwards, ensuring that the automotive steel pipe is fully immersed in the quenching fluid, avoiding the low precision problem of relying on the lowering method with a lifting device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a continuous heat treatment device for manufacturing automotive steel pipes according to the present invention. Figure 2 This is a schematic diagram of a continuous heat treatment apparatus for manufacturing automotive steel pipes according to the present invention placed in a trench. Figure 3 This is a cross-sectional view of the circulation section structure of the present invention; Figure 4 This is a cross-sectional view of the overall structure of a continuous heat treatment apparatus for manufacturing automotive steel pipes according to the present invention. Figure 5 This is a schematic diagram of the lifting guide structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of the structure of region D in the middle; Figure 7 This is a cross-sectional view of the air-insulated bending-resistant component structure of the present invention; Figure 8 This is a cross-sectional view of the flap installation position according to the present invention; Figure 9 This is a schematic diagram of the tumbling limiting component structure of the present invention.

[0019] In the diagram: 1. Quenching device; 101. Quenching pool; 102. Liquid supply pipe; 103. Sliding mounting strip; 2. Circulation unit; 201. External guide shell; 202. Circulation pump; 203. Discharge pipe; 204. Overflow pipe; 3. Lifting guide; 301. Lifting mounting frame; 302. Reset tension spring; 303. Limiting tooth; 4. Gas-insulated anti-bending component; 401. Sliding mounting block; 402. Gas supply pipe; 4021. Gas supply tension spring; 4022. Sealing ring; 403. Sealing spring; 404. Air inlet hose; 405. Handle; 406. Air-sealing core column; 407. Docking cover; 5. Pressure relief component; 501. Fixed mounting block; 502. Docking cylinder; 6. Tumbling limiting component; 601. Swing arm; 6011. Rotating shaft; 602. Flip plate; 603. Torsion spring. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figures 1 to 9 As shown: This invention provides a technical solution: a continuous heat treatment apparatus for manufacturing automotive steel pipes, comprising a quenching device 1, a circulation section 2 installed on the quenching device 1 for mixing quenching fluid; a lifting guide 3 installed on the quenching device 1 for guiding the automotive steel pipe downwards; a gas-insulated bending-resistant component 4 installed on the lifting guide 3; a pressure relief component 5 installed on the lifting guide 3; the pressure relief component 5 aligning with the gas-insulated bending-resistant component 4; two tumbling limiting components 6 installed inside the quenching device 1 for ensuring uniform mixing of the quenching fluid; the quenching device 1 includes a quenching pool 101 and a supply pipe 102, the supply pipe 102 being fixedly installed on the side of the quenching pool 101; the supply pipe 102 having an L-shaped structure; and quenching fluid being stored in the quenching pool 101.

[0022] The quenching device 1 further includes: sliding mounting strips 103, which are fixedly installed on both sides of the quenching pool 101 by bolts; the quenching pool 101 is placed in a ground trench; the circulation unit 2 includes: an external guide shell 201, a circulation pump 202, a discharge pipe 203, and an overflow pipe 204; the external guide shell 201 is fixedly installed on the top of the quenching pool 101; there is a gap between the inner side of the external guide shell 201 and the outer side of the quenching pool 101; the top of the external guide shell 201 is higher than the quenching pool 101; two circulation pumps 202 are fixedly installed on the external guide shell 201, and the two circulation pumps 202 have the same structure; the outlet pipe of the circulation pump 202 is fixedly installed... The quenching tank 101 is installed at the bottom inside; the inlet pipe of the circulating pump 202 is fixed at the bottom inside the quenching tank 101, and the inlet pipe of the circulating pump 202 passes through the quenching tank 101; the inlet pipe of the circulating pump 202 is located above the outlet pipe; a discharge pipe 203 is fixedly installed on the outlet pipe of the circulating pump 202; the discharge pipe 203 is fixedly installed at the bottom inside the quenching tank 101, and there is a row of through holes at the top of the discharge pipe 203; an overflow pipe 204 is fixedly installed on the side of the external guide shell 201; the overflow pipe 204 is used to discharge the quenching liquid overflowing from the quenching tank 101; quenching liquid is replenished into the quenching tank 101 through the supply pipe 102 until the quenching liquid overflows from the quenching tank 101 and overflows. The pipe 204 discharges the wastewater. This method is suitable for the use of continuous heat treatment production lines and can avoid excessively high quenching liquid temperature during continuous quenching. The lifting guide 3 includes a lifting mounting frame 301 and a return spring 302. The lifting mounting frame 301 is slidably mounted on two sliding mounting strips 103 on both sides. The lifting mounting frame 301 is used to guide the automotive steel pipe downward. Two return springs 302 are fixedly installed on both sides of the lifting mounting frame 301, and the tops of the four return springs 302 are fixedly connected to the inside of the quenching pool 101. The lifting guide 3 also includes a limiting tooth 303. The lifting mounting frame 301 is fixedly installed on both sides of the limiting tooth 303. 03 The lifting mounting bracket 301 protrudes on both sides; the circulation part 2 can accelerate the circulation and turbulence of the quenching liquid to ensure quenching quality. The turbulence of the quenching liquid can fully mix the components and effectively break up the vapor film, ensuring quenching quality. The lifting guide 3 can guide the automotive steel pipe to move vertically downward in a horizontal position, ensuring that the automotive steel pipe can be completely immersed in the quenching liquid. This avoids the problem of low accuracy when relying on the lowering method of the lifting tool. The lifting accuracy of the automotive steel pipe lifting tool is limited, and when lowered into the quenching liquid, one end is prone to quenching first, resulting in poor cooling uniformity. The lifting guide of this device can avoid this problem and reduce the probability of bending deformation of the steel pipe after quenching.

[0023] The gas-insulated bending-resistant component 4 includes: a sliding mounting block 401, an air supply pipe 402, an air supply tension spring 4021, a sealing ring 4022, and a sealing spring 403. The sliding mounting block 401 is fixedly mounted on the lifting mounting frame 301 by bolts; the air supply pipe 402 is slidably mounted on the sliding mounting block 401; an air supply tension spring 4021 is provided on the outside of the air supply pipe 402; one end of the air supply tension spring 4021 is fixedly connected to the air supply pipe 402, and the other end of the air supply tension spring 4021 is fixedly mounted on the sliding mounting block 401; a sealing ring 4022 is fixedly mounted on the inside of the air supply pipe 402, and the inside of the sealing ring 4022 has a beveled structure; a sealing spring 403 is sleeved on the air supply pipe 402; the gas-insulated bending-resistant component 4 also includes: an air inlet hose 4021. 4. The handle 405, the air-sealing core column 406, and the docking cover 407, under air pressure, in conjunction with the elastic push of the sealing spring 403, allow the air-sealing core column 406 to adhere to the sealing ring 4022 for sealing. Air pressure acts on the air-sealing core column 406. An air inlet hose 404 is fixedly installed on the air supply pipe 402, and the air inlet hose 404 is connected to an external air pump. The handle 405 is rotatably installed on the air supply pipe 402. The air-sealing core column 406 is located inside the air supply pipe 402. The outer side of the end of the air-sealing core column 406 has a tapered inclined surface structure. The inclined surface of the end of the air-sealing core column 406 can adhere to the sealing ring 4022. The docking cover 407 is fixedly installed on the air-sealing core column 406. The docking cover 407 is slidably sleeved on the air supply pipe 402. The sealing spring 403... One end is fixedly connected to the sliding mounting block 401, and the other end of the sealing spring 403 is fixedly connected to the docking cover 407; the docking cover 407 has a ring of through holes; the end of the docking cover 407 has a beveled structure; the pressure relief component 5 includes: a fixed mounting block 501 and a docking cylinder 502. The fixed mounting block 501 is fixedly mounted on the lifting mounting frame 301 by bolts; the docking cylinder 502 is fixedly mounted on the fixed mounting block 501; the end of the docking cylinder 502 has a beveled structure; the docking cylinder 502 is aligned with the docking cover 407, and the gas-insulated anti-bending component 4 is used. It can provide gas pressure protection during quenching by supplying gas pressure in real time, preventing water ingress, preventing the formation of a vapor film on the inner wall of the automotive steel pipe, which would lead to uneven hardness of the inner wall and temperature differences in different axial areas. The large size of the steel pipe causes bending problems, which can be applied to thick-walled steel pipes to achieve a performance match of external hardness and internal toughness. The structure and operation are simple, and it can realize automatic air pressure protection to achieve axial quenching temperature consistency of the steel pipe, while allowing the quenching liquid to gradually cool the steel pipe inward in the radial direction. After the docking cover 407 is inserted into one end of the steel pipe, the air-sealing core column 406 and the sealing ring 4022 can be separated under the pull of the air supply spring 4021 to realize air supply. When quenching is completed, after the automotive steel pipe is disassembled, the sealing spring 403 can push the docking cover 407 forward, causing the air-sealing core column 406 to re-fit the sealing ring 4022 for sealing, avoiding waste of air source, eliminating the need for manual use of sealing plugs, enhancing safety, and eliminating the risk of leakage.

[0024] In Example 2, based on Example 1, the tumbling limiting component 6 includes: two swing arms 601 and two rotating shafts 6011. Two swing arms 601 are provided, each located inside the quenching pool 101. Two rotating shafts 6011 are fixedly installed inside the quenching pool 101, and swing arms 601 are rotatably mounted on each of the two rotating shafts 6011. The tumbling limiting component 6 also includes: a flap 602 and a torsion spring 603. A flap 602 is fixedly installed on each of the two swing arms 601. A torsion spring 603 is sleeved on each of the two rotating shafts 6011, with one end of each torsion spring 603 fixedly connected to the swing arm 601 and the other end fixedly connected to the rotating shaft 6011. The flap 602 elastically fits against the side of the lifting mounting frame 301, and is located below the limiting tooth 303. The flap 602 is installed at an angle. Using the tumbling limiting component 6, the quenching process can be automatically detected. The quenching liquid in the fire pool 101 churns normally, ensuring quenching quality and preventing issues such as the circulation pump 202 being turned on too late before lowering the car steel pipe, or the circulation pump 202 being blocked or malfunctioning, resulting in a low water spray head that affects quenching quality. The flap 602 can be automatically controlled by the stop limit tooth 303, prompting the staff to wait until the drainage head of the circulation pump 202 reaches the standard or to repair the circulation pump 202 before proceeding with quenching, eliminating the need for manual visual judgment of the circulation pump 202's head. Under the pressure of the drain water from the discharge pipe 203, the inclined flap 602, pushed by the upward churning quenching liquid, can rotate outward along with the swing arm 601. At this time, the torsion spring 603 can provide elastic connection for subsequent reset. After the flap 602 rotates outward, it is no longer attached to the lifting mounting frame 301, and thus no longer stops the stop limit tooth 303.

[0025] The working principle of this embodiment is as follows: First, after digging a trench in the workshop, the quenching tank 101 is placed in the trench. Quenching liquid is supplied through the liquid supply pipe 102 until it overflows from the quenching tank 101 and is then discharged through the overflow pipe 204. Subsequently, the circulation pump 202 is started to circulate water. Water is drawn in through the liquid inlet pipe of the circulation pump 202 and drained quickly upwards through a row of through holes at the top of the discharge pipe 203. Under the strong water pressure, the quenching liquid in the quenching tank 101 can continuously churn. The automotive steel pipe is lifted using a workshop crane, with one end inserted into the docking cylinder 502, and then manually pulled outwards. Handle 405, at this time the air supply pipe 402 can be pulled outward, stretching the air supply spring 4021. The air supply pipe 402, through the inclined surface of the internally fixed closed ring 4022, will press against the inclined surface of the core column 406, thereby driving the core column 406 to move. The movement of the core column 406 causes the docking cover 407 to move towards the sliding mounting block 401, thus allowing the docking cover 407 to avoid the other end of the automotive steel pipe. At this time, the closing spring 403 is compressed. The other end of the hoisted automotive steel pipe can then be aligned with the docking cover 407. Handle 405 can then be released. Combined with the tension of the air supply spring 4021, the docking... When the cover 407 is inserted into the automotive steel pipe for clamping and positioning, it is constrained by the stop of the steel pipe. At this time, the sealing spring 403 is also compressed and not fully reset. The tension of the air supply spring 4021 is greater than the elastic force of the sealing spring 403 and the pushing force of the air-sealing core column 406 by the air pressure. At this time, the air supply pipe 402 can move forward towards the end of the steel pipe under the elastic force. Because the air-sealing core column 406 is stopped by the steel pipe, it cannot move further. At this time, the air-sealing core column 406 and the end slope of the sealing ring 4022 separate. At this time, the air pressure of the air pump connected to the air intake hose 404 can be drawn from the end of the cover 407. The quenching liquid is discharged through a ring of holes in the steel pipe, then through the hollow area of ​​the steel pipe, and discharged from the docking cylinder 502. The docking cylinder 502 is connected to a hose to lead the air pressure to the outside, maintaining air pressure inside the automotive steel pipe to prevent uneven entry of quenching liquid into the automotive steel pipe and to prevent problems such as bending deformation caused by poor consistency of the axial cooling area of ​​the steel pipe. Then the automotive steel pipe can be lowered and guided by the lifting mounting frame 301 sliding on the sliding mounting strip 103 to stretch the return spring 302 until it is immersed in quenching liquid for uniform quenching. In this way, automotive steel pipes can be continuously hoisted and quenched. After the circulating pump 202 is turned on, as its speed reaches the target, its head gradually increases, causing the quenching liquid in the quenching tank 101 to rise. Under the pressure of the drain water from the discharge pipe 203, the inclined flap 602, propelled by the upward-rising quenching liquid, drives the swing arm 601 to rotate outward. At this time, the torsion spring 603 can be elastically connected for easy subsequent reset. After the flap 602 rotates outward, it is no longer attached to the lifting mounting frame 301, and thus no longer blocks the limiting tooth 303. The lifting mounting frame 301 can then... If the quenching fluid cannot be effectively churned due to reasons such as the circulation pump 202 starting too late, the speed not reaching the set value, or blockage of the discharge pipe, the bottom of the flap 602 will not receive sufficient thrust from the quenching fluid. In this case, the flap 602 will remain in place under the torque of the torsion spring 603 and will not be able to rotate outward. If the car steel pipe is lowered at this time, the lifting mounting bracket 301 will be blocked by the flap 602 when it moves downward with the limit tooth 303, and the steel pipe will not be able to be lowered into the quenching fluid to complete the quenching. This serves as a reminder for the staff to troubleshoot the fault in time.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous heat treatment apparatus for manufacturing automotive steel pipes, comprising a quenching device, wherein a circulation unit is installed on the quenching device, characterized in that: The quenching device is equipped with a lifting guide; The lifting guide is equipped with an air-insulated bending-resistant component; the lifting guide is equipped with a pressure relief component; the pressure relief component is aligned with the air-insulated bending-resistant component; The quenching device is equipped with two tumbling limiters inside. The quenching device includes a quenching tank and a liquid supply pipe, with the liquid supply pipe fixedly installed on the side of the quenching tank.

2. The continuous heat treatment apparatus for manufacturing automotive steel pipes according to claim 1, characterized in that: The quenching device further includes: sliding mounting bars, and sliding mounting bars are fixedly installed on both sides of the quenching pool.

3. The continuous heat treatment apparatus for manufacturing automotive steel pipes according to claim 1, characterized in that: The circulation section includes: an external guide shell, a circulation pump, a discharge pipe, and an overflow pipe. The external guide shell is fixedly installed on the top of the quenching tank. A gap is provided between the inner side of the external guide shell and the outer side of the quenching tank. The top of the external guide shell is higher than the quenching tank. A circulation pump is fixedly installed on the external guide shell. The outlet pipe of the circulation pump is fixedly installed at the bottom of the inner side of the quenching tank. The inlet pipe of the circulation pump is fixed at the bottom of the inner side of the quenching tank, and the inlet pipe of the circulation pump is higher than the outlet pipe. A discharge pipe is fixedly installed on the outlet pipe of the circulation pump. The discharge pipe is fixedly installed at the bottom of the inner side of the quenching tank, and there is a row of through holes at the top of the discharge pipe. An overflow pipe is fixedly installed on the side of the external guide shell.

4. The continuous heat treatment apparatus for manufacturing automotive steel pipes according to claim 2, characterized in that: The lifting guide includes a lifting mounting frame and a reset spring. The lifting mounting frame is slidably mounted on two sliding mounting strips on both sides. Reset springs are fixedly mounted on both sides of the lifting mounting frame, and the top ends of the reset springs are fixedly connected to the inside of the quenching tank.

5. The continuous heat treatment apparatus for manufacturing automotive steel pipes according to claim 4, characterized in that: The lifting guide also includes: limiting teeth, with limiting teeth fixedly installed on both sides of the lifting mounting frame, and the limiting teeth protruding from both sides of the lifting mounting frame.

6. The continuous heat treatment apparatus for manufacturing automotive steel pipes according to claim 4, characterized in that: The gas-insulated bending-resistant component includes: a sliding mounting block, an air supply pipe, an air supply tension spring, a closing ring, and a closing spring. The sliding mounting block is fixedly mounted on one side of the lifting mounting frame. The air supply pipe is slidably mounted on the sliding mounting block. An air supply tension spring is provided on the outside of the air supply pipe. One end of the air supply tension spring is fixedly connected to the air supply pipe, and the other end of the air supply tension spring is fixedly mounted on the sliding mounting block. A closing ring is fixedly mounted on the inside of the air supply pipe, and one end of the closing ring has a beveled structure. A closing spring is sleeved on the air supply pipe.

7. A continuous heat treatment apparatus for manufacturing automotive steel pipes according to claim 6, characterized in that: The gas-insulated bending-resistant component further includes: an air inlet hose, a handle, an air-sealing core column, and a docking cover. The air inlet hose is fixedly installed on the air supply pipe and is connected to an external air pump. The handle is installed on the air supply pipe. The air-sealing core column is located inside the air supply pipe. One end of the air-sealing core column has a beveled structure on its outer side. The beveled end of the air-sealing core column can be attached to the sealing ring. The other end of the air-sealing core column is fixedly installed with a docking cover. The docking cover is slidably sleeved on the air supply pipe. One end of the sealing spring is fixedly connected to the sliding mounting block, and the other end of the sealing spring is fixedly connected to the docking cover. The docking cover has a ring of through holes.

8. The continuous heat treatment apparatus for manufacturing automotive steel pipes according to claim 7, characterized in that: The pressure relief component includes a fixed mounting block and a docking cylinder. The fixed mounting block is fixedly mounted on the other side of the lifting mounting frame. The docking cylinder is fixedly mounted on the fixed mounting block.

9. A continuous heat treatment apparatus for manufacturing automotive steel pipes according to claim 5, characterized in that: The tumbling limiting component includes: a swing arm and a rotating shaft. There are two swing arms, which are located inside the quenching tank. Two rotating shafts are fixedly installed inside the quenching tank, and swing arms are rotatably installed on the two rotating shafts respectively.

10. A continuous heat treatment apparatus for manufacturing automotive steel pipes according to claim 9, characterized in that: The tumbling limiting component also includes: a flap and a torsion spring. The flap is fixedly installed on the two swing arms; a torsion spring is respectively sleeved on the two rotating shafts, and one end of the two torsion springs is fixedly connected to the swing arm, and the other end of the two torsion springs is fixedly connected to the rotating shaft; the flap elastically fits against the side of the lifting mounting frame, and the flap is located below the limiting tooth; the flap is installed at an angle.

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