A heat treatment device for high stress ship steel processing

Abstract

The application relates to the technical field of steel processing heat treatment, and discloses a heat treatment device for high-stress ship steel processing, which comprises a heat treatment furnace body, a sealing furnace cover movably connected to the side of the heat treatment furnace body, a quenching mechanism movably connected to the inside of the heat treatment furnace body, a limiting mechanism movably connected to the inside of the quenching mechanism, a quenching oil tank fixedly connected to the bottom end in the heat treatment furnace body, and an exhaust mechanism fixedly connected to the side of the heat treatment furnace body away from the sealing furnace cover; the spring to be treated is placed below the placing cylinder and the limiting outer cylinder inside; when the hand wheel is rotated, the adjusting screw is driven to rotate, the moving plate is lowered as a whole, the moving plate drives all the limiting outer cylinders and the limiting inner shaft to be lowered when the moving plate is lowered, the limiting outer cylinder is located outside the spring to be treated, and the limiting inner shaft is located inside the spring to be treated, so that all the springs to be treated are limited, and deformation of the spring to be treated during quenching is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel processing heat treatment, more particularly to a heat treatment device for high-stress ship steel processing. BACKGROUND

[0002] The ship breathing valve is a device for preventing the hull from being damaged, and the ship breathing valve mainly has gravity type and piston spring type, which functions to discharge gas to the atmosphere when the cabin pressure reaches a certain value and is in an overpressure state, and to absorb the atmosphere into the cabin when the pressure drops below a certain value and is in a negative pressure state, thereby preventing the hull from being damaged, adjusting the cabin pressure, and avoiding liquid cargo loss.

[0003] Valve springs refer to springs used on various valves, and valve springs determine the opening pressure, travel of the valve disc, and stability of the seal in the closed state in the valve, and the valve spring itself needs to have high stress due to its use occasion, so it needs to be heat treated after processing to ensure its working performance. High-stress springs have high load-carrying capacity and spring force, can withstand greater load in the same space, and have a longer service life.

[0004] Nowadays, when heat treating the valve spring in the ship, it is generally quenched. Due to the special structure of the spring, when the spring is heated and placed in the quenching oil, it may deform laterally, causing the size of the quenched spring to change. The deformed spring cannot meet the use requirements. The heat treatment equipment of the present cannot avoid the deformation of the spring.

[0005] Before heat treating the spring, it needs to be sent to the furnace, and after quenching heat treatment, it needs to be taken out. The one-by-one taking-out method will reduce the overall processing efficiency, so the spring feeding and discharging work is relatively cumbersome nowadays.

[0006] When the spring is quenched, the high-temperature spring will cause the oil to vaporize instantly and become oil fume when it comes into contact with the oil. If the oil fume is directly discharged, a large amount of vaporized oil will be discharged together, which will cause waste of oil. SUMMARY

[0007] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present application provide a heat treatment device for high-stress ship steel processing to solve the technical problems proposed in the background art.

[0008] In order to achieve the above object, the present application provides the following technical scheme: a heat treatment device for high-stress ship steel processing, comprising a heat treatment furnace body, a sealing furnace cover movably connected to the side of the heat treatment furnace body, a quenching mechanism movably connected to the inside of the heat treatment furnace body, a limiting mechanism movably connected to the inside of the quenching mechanism, a quenching oil tank fixedly connected to the bottom end inside the heat treatment furnace body, and an exhaust mechanism fixedly connected to the side of the heat treatment furnace body away from the sealing furnace cover.

[0009] The limiting mechanism comprises a fixed plate, a through hole is formed in the inside of the fixed plate, a limiting ring is fixedly connected in the through hole of the fixed plate, a limiting outer cylinder is movably connected to the outside of the limiting ring, a limiting inner shaft is movably connected to the inside of the limiting ring, a connecting arc plate is fixedly connected to the bottom end of the limiting ring, a placing cylinder is fixedly connected to the side of the connecting arc plate, and a spring to be treated is placed in the placing cylinder, and the top end of the spring to be treated is located on the inside of the limiting outer cylinder and the outside of the limiting inner shaft.

[0010] In a preferred embodiment, when the limiting mechanism moves up and down, the side of the exhaust mechanism close to the limiting mechanism does not contact the limiting mechanism, the bottom end of the side of the exhaust mechanism close to the limiting mechanism is fixedly connected to the top end of the quenching oil tank, and the oil in the exhaust mechanism flows back into the quenching oil tank.

[0011] In a preferred embodiment, the center axes of the placing cylinder, the limiting outer cylinder and the limiting inner shaft coincide, a through groove is formed in the side of the limiting outer cylinder, the lengths of the limiting outer cylinder and the limiting inner shaft are the same, and when the limiting outer cylinder and the limiting inner shaft are located at the uppermost position, the bottom ends of the limiting outer cylinder and the limiting inner shaft are located one centimeter below the bottom end of the fixed plate.

[0012] In a preferred embodiment, the top ends of the limiting outer cylinder and the limiting inner shaft are fixedly connected with a moving plate, the moving plate connects all the limiting outer cylinders and the limiting inner shafts, an adjusting screw is screwedly connected in the inside of the moving plate, a hand wheel is fixedly connected to the top end of the adjusting screw, a limiting shaft is movably connected in the inside of the moving plate, and when the moving plate contacts the fixed plate, the bottom ends of the limiting outer cylinder and the limiting inner shaft contact the top end of the placing cylinder.

[0013] In a preferred embodiment, the quenching mechanism comprises a servo motor which can be controlled, a threaded rod is fixedly connected to the bottom end of the servo motor, a lifting frame is screwedly connected to the side of the threaded rod, and a sliding groove which is matched with the fixed plate in the limiting mechanism is formed in the inside of the lifting frame.

[0014] In a preferred implementation form, the bottom end of the servo motor is fixedly connected with a heat insulation plate, the bottom end of the heat insulation plate is fixedly connected with the top end of the heat treatment furnace body, the inside of the lifting frame is movably connected with a limiting rod, and the limiting rod is located in the inside of the quenching oil tank and is fixedly connected with the quenching oil tank.

[0015] In a preferred implementation form, the side of the lifting frame is fixedly connected with a connecting plate, the inside of the connecting plate away from the lifting frame is fixedly connected with a fixed shaft, the side of the fixed shaft is movably sleeved with a baffle, the baffle and the side of the lifting frame away from the fixed shaft are provided with a communicating threaded groove, and the baffle and the lifting frame are threadedly connected with a connecting screw rod in the threaded groove.

[0016] In a preferred implementation form, the exhaust mechanism comprises a gas passage through which gas can pass, the side of the gas passage away from the heat treatment furnace body is fixedly connected with a sealing valve, the inside of the gas passage is fixedly connected with a condenser pipe, and the top end of the condenser pipe is fixedly connected with a condenser.

[0017] In a preferred implementation form, the bottom end of the condenser pipe in the gas passage is fixedly connected with a discharging passage, the discharging passage is communicated with the gas passage, the side of the discharging passage is fixedly connected with a backflow passage, the backflow passage is located above the quenching oil tank, and the inside of the discharging passage is movably connected with a filter plate.

[0018] The technical effects and advantages of the present application are as follows:

[0019] 1. The present application places the to-be-processed springs below the placement cylinder and the limiting outer cylinder inside, rotates the hand wheel to drive the adjusting screw to rotate, and then makes the moving plate as a whole descend, drives all the limiting outer cylinders and the limiting inner shafts to descend when the moving plate descends, and after the limiting outer cylinders and the limiting inner shafts descend, the limiting outer cylinders are located outside the to-be-processed springs, and the limiting inner shafts are located inside the to-be-processed springs, so that all the to-be-processed springs are limited, and deformation of the to-be-processed springs during quenching is avoided.

[0020] 2. The present application separates the connecting screw rod and the baffle from the lifting frame before quenching, moves the baffle away from the lifting frame around the fixed shaft at this time, places the fixed plate in the sliding groove in the lifting frame at this time, pushes the fixed plate into the lifting frame, resets the baffle again, connects the baffle and the lifting frame through the connecting screw rod, fixes the fixed plate, quickly completes feeding, separates the connecting screw rod during discharging, and the to-be-processed springs in the limiting mechanism and the limiting mechanism after quenching can be taken out.

[0021] 3、The oil fume generated when quenching can enter the gas channel, and the oil fume can be liquefied into oil liquid when passing through the gas channel and the condensing pipe, the oil liquid can fall into the discharging channel along the condensing pipe, and the impurities in the oil liquid can be blocked by the filter plate when flowing downwards in the discharging channel, the clean oil liquid can pass through the filter plate and the reflux channel and return to the quenching oil tank again, and the oil liquid can be repeatedly used. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the heat treatment furnace.

[0023] Figure 2 It is a schematic diagram of the internal structure of the heat treatment furnace.

[0024] Figure 3 It is a schematic diagram of the overall structure of the quenching mechanism.

[0025] Figure 4 It is a schematic diagram of the exploded structure of the quenching mechanism.

[0026] Figure 5 It is a schematic diagram of the overall structure of the limiting mechanism.

[0027] Figure 6 It is a schematic diagram of the connection structure of the limiting mechanism and the lifting frame.

[0028] Figure 7 It is a schematic diagram of the limiting mechanism from the bottom.

[0029] Figure 8 It is a schematic diagram of the limiting ring structure in the fixed plate.

[0030] Figure 9 It is a schematic diagram of the exhaust mechanism structure.

[0031] The figure mark is: 1, heat treatment furnace body; 2, sealing furnace cover; 3, quenching mechanism; 301, servo motor; 302, threaded rod; 303, lifting frame; 304, limiting rod; 305, heat insulation plate; 306, connecting plate; 307, fixed shaft; 308, baffle; 309, connecting screw; 4, limiting mechanism; 401, fixed plate; 402, adjusting screw; 403, hand wheel; 404, limiting shaft; 405, moving plate; 406, limiting outer cylinder; 407, limiting inner shaft; 408, limiting ring; 409, connecting arc plate; 410, placing cylinder; 5, quenching oil tank; 6, exhaust mechanism; 601, gas channel; 602, sealing valve; 603, condensing pipe; 604, condenser; 605, discharging channel; 606, reflux channel; 607, filter plate; 7, spring to be treated. DETAILED DESCRIPTION

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The heat treatment apparatus for processing high-stress ship steel involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Reference Figure 1 and Figure 2 This invention provides a heat treatment apparatus for processing high-stress marine steel, comprising a heat treatment furnace body 1, a sealing furnace cover 2 movably connected to the side of the heat treatment furnace body 1, a quenching mechanism 3 movably connected inside the heat treatment furnace body 1, a limiting mechanism 4 movably connected inside the quenching mechanism 3, a quenching oil tank 5 fixedly connected to the bottom inside the heat treatment furnace body 1, and an exhaust mechanism 6 fixedly connected to the side of the heat treatment furnace body 1 away from the sealing furnace cover 2. When the limiting mechanism 4 moves up and down, the side of the exhaust mechanism 6 near the limiting mechanism 4 does not contact the limiting mechanism 4, and the bottom end of the side of the exhaust mechanism 6 near the limiting mechanism 4 is fixedly connected to the top end of the quenching oil tank 5, and the oil in the exhaust mechanism 6 flows back into the quenching oil tank 5.

[0034] In this embodiment, the side of the exhaust mechanism 6 near the limiting mechanism 4 does not contact the limiting mechanism 4, thus avoiding interference between the exhaust mechanism 6 and the limiting mechanism 4. The oil in the exhaust mechanism 6 flows back into the quenching oil tank 5, so that the oil can be reused.

[0035] Reference Figure 5 , Figure 6 , Figure 7 as well as Figure 8The limiting mechanism 4 comprises a fixed plate 401 which can be fixed, a through hole is formed in the inside of the fixed plate 401, a limiting ring 408 is fixedly connected in the through hole of the fixed plate 401, the outside of the limiting ring 408 is movably connected with a limiting outer cylinder 406, the inside of the limiting ring 408 is movably connected with a limiting inner shaft 407, the bottom end of the limiting ring 408 is fixedly connected with a connecting arc plate 409, the side of the connecting arc plate 409 is fixedly connected with a placing cylinder 410, the placing cylinder 410 is placed with a spring to be treated 7, the top end of the spring to be treated 7 is located inside the limiting outer cylinder 406 and outside the limiting inner shaft 407, the placing cylinder 410 coincides with the central axis of the limiting outer cylinder 406 and the limiting inner shaft 407, a through slot is formed in the side of the limiting outer cylinder 406, the limiting outer cylinder 406 is the same in length with the limiting inner shaft 407, when the limiting outer cylinder 406 and the limiting inner shaft 407 are located at the uppermost position, the bottom end of the limiting outer cylinder 406 and the limiting inner shaft 407 is located one centimeter below the bottom end of the fixed plate 401, the top end of the limiting outer cylinder 406 and the limiting inner shaft 407 is fixedly connected with a moving plate 405, the moving plate 405 connects all the limiting outer cylinder 406 and the limiting inner shaft 407, a adjusting screw 402 is screw-connected in the inside of the moving plate 405, the top end of the adjusting screw 402 is fixedly connected with a hand wheel 403, a limiting shaft 404 is movably connected in the inside of the moving plate 405, when the moving plate 405 contacts with the fixed plate 401, the bottom end of the limiting outer cylinder 406 and the limiting inner shaft 407 contacts with the top end of the placing cylinder 410.

[0036] In the embodiment of the present application, when the limiting outer cylinder 406 and the limiting inner shaft 407 move downward, the spring to be treated 7 is located between the limiting outer cylinder 406 and the limiting inner shaft 407, so that when the spring to be treated 7 deforms outward, it is limited by the limiting outer cylinder 406, and when it deforms inward, it is limited by the limiting inner shaft 407, thereby preventing the spring to be treated 7 from deforming during quenching. The side surface of the limiting outer cylinder 406 is provided with a through groove, so that the oil in the quenching oil tank 5 can quickly enter the inside of the limiting outer cylinder 406 and come into contact with the spring to be treated 7. The center axis of the placement cylinder 410 coincides with the center axis of the limiting outer cylinder 406 and the limiting inner shaft 407, so that the spring to be treated 7 is in a vertical state after being limited, thereby ensuring the quality. When the limiting outer cylinder 406 and the limiting inner shaft 407 are located at the uppermost position, the bottom end of the limiting outer cylinder 406 and the limiting inner shaft 407 is located below the bottom end of the fixed plate 401, so that the upper part of the spring to be treated 7 can be limited, and when the limiting outer cylinder 406 and the limiting inner shaft 407 move downward, the spring to be treated 7 is located only between the limiting outer cylinder 406 and the limiting inner shaft 407. The moving plate 405 connects all the limiting outer cylinders 406 and the limiting inner shafts 407, so that multiple limiting outer cylinders 406 and limiting inner shafts 407 can move synchronously, thereby limiting multiple springs to be treated 7 at the same time and improving work efficiency. When the moving plate 405 contacts the fixed plate 401, the limiting outer cylinder 406 and the limiting inner shaft 407 move to the lowermost position, and the bottom end of the limiting outer cylinder 406 and the limiting inner shaft 407 contacts the top end of the placement cylinder 410, thereby limiting the entire spring to be treated 7.

[0037] Referring to Figure 3 With Figure 4 , the quenching mechanism 3 comprises a controllable servo motor 301, the bottom end of the servo motor 301 is fixedly connected with a threaded rod 302, the side surface of the threaded rod 302 is threadedly connected with a lifting frame 303, the inside of the lifting frame 303 is provided with a sliding groove matched with the fixed plate 401 in the limiting mechanism 4, the bottom end of the servo motor 301 is fixedly connected with a heat insulation plate 305, the bottom end of the heat insulation plate 305 is fixedly connected with the top end of the heat treatment furnace body 1, the inside of the lifting frame 303 is movably connected with a limiting rod 304, the limiting rod 304 is located in the inside of the quenching oil tank 5 and is fixedly connected with the quenching oil tank 5, the side surface of the lifting frame 303 is fixedly connected with a connecting plate 306, the inside of the connecting plate 306 away from the lifting frame 303 is fixedly connected with a fixed shaft 307, the side surface of the fixed shaft 307 movably sleeves a baffle 308, the baffle 308 and the side surface of the lifting frame 303 away from the fixed shaft 307 are provided with a communicating threaded groove, and the baffle 308 and the lifting frame 303 are threadedly connected with a connecting screw 309 in the threaded groove.

[0038] In the embodiment of the present application, the connecting screw 309 is turned out from the baffle 308 and the lifting frame 303, the baffle 308 is turned away from the lifting frame 303 around the fixed shaft 307, at this time, the fixed plate 401 can be placed in the sliding groove of the lifting frame 303, and the feeding work is carried out, the fixed plate 401 is pushed inward, when the baffle 308 is reversely turned around the fixed shaft 307, the connecting screw 309 is turned into the baffle 308 and the connecting screw 309, so as to connect the lifting frame 303 and the connecting screw 309, at this time, the limiting mechanism 4 can be driven to move, so as to carry out the quenching work, in addition, it should be noted that the quenching oil tank 5 can accommodate the quenching mechanism 3, so that the quenching mechanism 3 can be immersed in the quenching oil tank 5 to carry out the quenching work when moving up and down.

[0039] With reference to Figure 2 With reference to Figure 9 The exhaust mechanism 6 comprises a gas passage 601 through which gas can pass, the gas passage 601 is fixedly connected to the side of the heat treatment furnace body 1 away from the heat treatment furnace body 1, the gas passage 601 is fixedly connected with a condenser pipe 603 inside, the top end of the condenser pipe 603 is fixedly connected with a condenser 604, the bottom end of the condenser pipe 603 in the gas passage 601 is fixedly connected with a discharging passage 605, the discharging passage 605 is in communication with the gas passage 601, the side of the discharging passage 605 is fixedly connected with a reflux passage 606, the reflux passage 606 is located above the quenching oil tank 5, and the discharging passage 605 is movably connected with a filter plate 607.

[0040] In the embodiment of the present application, the gaseous oil liquid is liquefied and remains on the condenser pipe 603, the oil liquid remaining on the condenser pipe 603 flows into the discharging passage 605 under the action of gravity, the oil liquid flowing into the discharging passage 605 flows downward again, and flows through the filter plate 607, the filter plate 607 intercepts the impurities in the oil liquid, the clean oil liquid is returned to the quenching oil tank 5 through the reflux passage 606 for repeated use, and the filter plate 607 can be taken out from the discharging passage 605, so as to clean the filter plate 607 and ensure the filtering effect.

[0041] The working principle of the present application is as follows: before quenching, the to-be-processed spring 7 is placed in the placing cylinder 410, and the upper part of the to-be-processed spring 7 is located inside the limiting outer cylinder 406, and the limiting inner shaft 407 is located inside the to-be-processed spring 7. After all the springs are placed, the hand wheel 403 is rotated, and the rotation of the hand wheel 403 drives the rotation of the adjusting screw 402. When the adjusting screw 402 rotates, the moving plate 405 moves downward, and the moving plate 405 moves downward, which drives all the limiting outer cylinders 406 and the limiting inner shaft 407 to move downward. At this time, the limiting outer cylinder 406 moves outside the to-be-processed spring 7 and completely covers the outside of the to-be-processed spring 7, and the limiting inner shaft 407 moves downward inside the to-be-processed spring 7, penetrates the to-be-processed spring 7 and contacts the lower placing cylinder 410, and the moving plate 405 contacts the fixed plate 401 as a whole. At this time, as shown in the figure, therefore, the to-be-processed spring 7 is provided with the limiting outer cylinder 406 outside and the limiting inner shaft 407 inside; Figure 2

[0042] After the inside of the to-be-processed spring 7 is limited, the sealing furnace cover 2 is opened, the connecting screw 309 is turned out from the baffle 308 and the lifting frame 303, the baffle 308 rotates away from the lifting frame 303 around the fixed shaft 307, at this time the fixed plate 401 is placed in the sliding groove of the lifting frame 303, the fixed plate 401 is pushed inward, so that the fixed plate 401 completely enters the lifting frame 303, the baffle 308 is rotated in the opposite direction around the fixed shaft 307, so that the baffle 308 contacts the lifting frame 303, the connecting screw 309 is turned into the baffle 308 and the connecting screw 309, so that the lifting frame 303 is connected with the connecting screw 309, after connection, the sealing furnace cover 2 is closed, and the heat treatment furnace body 1 is sealed; after the heat treatment furnace body 1 is sealed, heating is carried out through the heat treatment furnace body 1, and after the to-be-processed spring 7 is heated to the preset temperature, the servo motor 301 starts and drives the threaded rod 302 to rotate, the threaded rod 302 rotates and drives the lifting frame 303 to move downward, the lifting frame 303 moves downward and drives the limiting mechanism 4 inside it and the to-be-processed spring 7 inside the limiting mechanism 4 to move downward as a whole, at this time the limiting mechanism 4 is immersed in the oil liquid of the quenching oil tank 5;

[0043] When the limiting mechanism 4 and the to-be-processed spring 7 inside it are immersed in the oil liquid, the high-temperature to-be-processed spring 7 causes the oil liquid to vaporize and produce oil smoke, at this time the sealing valve 602 is opened, the flue gas enters the gas passage 601, and the oil smoke contacts the condenser pipe 603 when it enters the inside of the gas passage 601, so that the gaseous oil liquid in the oil smoke is liquefied and remains on the condenser pipe 603. The oil liquid remaining on the condenser pipe 603 flows into the discharging passage 605 under the action of gravity, and the oil liquid flowing into the discharging passage 605 flows downward again, and flows through the filter plate 607 when flowing, the filter plate 607 intercepts the impurities in the oil liquid, and the clean oil liquid is returned to the quenching oil tank 5 through the reflux passage 606 for repeated use; ​

[0044] When the exhaust is not needed, the sealing valve 602 is closed to seal the gas passage 601, after the cooling after quenching is completed, the quenching mechanism 3 is opened, and the connecting screw rod 309 is separated from the baffle 308 and the lifting frame 303, at this time the baffle 308 is opened to quickly take out the limiting mechanism 4, after the limiting mechanism 4 is taken out, a new limiting mechanism 4 can be put in for heat treatment, and the removed limiting mechanism 4 reversely rotates the handle 403, so that the limiting outer cylinder 406 and the limiting inner shaft 407 move upward, and the heat-treated spring 7 to be treated can be taken out.

[0045] Finally: the above is only the preferred embodiment of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A heat treatment device for high stress ship steel processing, comprising a heat treatment furnace body (1), characterized in that: The side of the heat treatment furnace body (1) is movably connected with a sealing furnace cover (2), the inside of the heat treatment furnace body (1) is movably connected with a quenching mechanism (3), the inside of the quenching mechanism (3) is movably connected with a limiting mechanism (4), the bottom end inside the heat treatment furnace body (1) is fixedly connected with a quenching oil tank (5), and the side, away from the sealing furnace cover (2), of the heat treatment furnace body (1) is fixedly connected with an exhaust mechanism (6); the limiting mechanism (4) comprises a fixed plate (401) which can be fixed, a through hole is formed in the inside of the fixed plate (401), a limiting ring (408) is fixedly connected in the through hole of the fixed plate (401), a limiting outer cylinder (406) is movably connected to the outside of the limiting ring (408), a limiting inner shaft (407) is movably connected to the inside of the limiting ring (408), a connecting arc plate (409) is fixedly connected to the bottom end of the limiting ring (408), a placing cylinder (410) is fixedly connected to the side of the connecting arc plate (409), and a spring to be treated (7) is placed in the placing cylinder (410); the top end of the spring to be treated (7) is located inside the limiting outer cylinder (406) and outside the limiting inner shaft (407). When the limiting mechanism (4) moves up and down, the side, close to the limiting mechanism (4), of the exhaust mechanism (6) is not in contact with the limiting mechanism (4), the bottom end of the side, close to the limiting mechanism (4), of the exhaust mechanism (6) is fixedly connected with the top end of the quenching oil tank (5), and the oil liquid in the exhaust mechanism (6) flows back into the quenching oil tank (5); The center axes of the placing cylinder (410), the limiting outer cylinder (406) and the limiting inner shaft (407) coincide, a through groove is formed in the side of the limiting outer cylinder (406), the length of the limiting outer cylinder (406) is the same as that of the limiting inner shaft (407), and when the limiting outer cylinder (406) and the limiting inner shaft (407) are located at the uppermost position, the bottom ends of the limiting outer cylinder (406) and the limiting inner shaft (407) are located one centimeter below the bottom end of the fixed plate (401); The top ends of the limiting outer cylinder (406) and the limiting inner shaft (407) are fixedly connected with a moving plate (405), the moving plate (405) connects all the limiting outer cylinders (406) and the limiting inner shafts (407), an adjusting screw rod (402) is screw-connected in the inside of the moving plate (405), a hand wheel (403) is fixedly connected to the top end of the adjusting screw rod (402), a limiting shaft (404) is movably connected in the inside of the moving plate (405), and when the moving plate (405) is in contact with the fixed plate (401), the bottom ends of the limiting outer cylinder (406) and the limiting inner shaft (407) are in contact with the top end of the placing cylinder (410).

2. A heat treatment apparatus for processing a high stress ship steel according to claim 1, characterized in that: The quenching mechanism (3) includes a controllable servo motor (301), the bottom end of the servo motor (301) is fixedly connected with a threaded rod (302), the side surface of the threaded rod (302) is threadedly connected with a lifting frame (303), and the inside of the lifting frame (303) is provided with a sliding groove matched with the fixed plate (401) in the limiting mechanism (4).

3. A heat treatment apparatus for processing a steel for high stress ships according to claim 2, characterized in that: The bottom end of the servo motor (301) is fixedly connected with a heat insulation plate (305), the bottom end of the heat insulation plate (305) is fixedly connected with the top end of the heat treatment furnace body (1), the inside of the lifting frame (303) is movably connected with a limiting rod (304), and the limiting rod (304) is located in the inside of the quenching oil tank (5) and is fixedly connected with the quenching oil tank (5).

4. A heat treatment apparatus for processing a steel for high stress ships according to claim 3, characterized in that: The side surface of the lifting frame (303) is fixedly connected with a connecting plate (306), the inside of the connecting plate (306) away from the lifting frame (303) is fixedly connected with a fixed shaft (307), the side surface of the fixed shaft (307) is movably sleeved with a baffle (308), the side surface of the baffle (308) away from the fixed shaft (307) is provided with a threaded groove in communication with the lifting frame (303), and the baffle (308) and the lifting frame (303) are both threadedly connected with a connecting screw rod (309) in the threaded groove.

5. A heat treatment apparatus for processing a steel for high stress ships according to claim 1, characterized in that: The exhaust mechanism (6) includes a gas passage (601) through which gas can pass, the side surface of the gas passage (601) away from the heat treatment furnace body (1) is fixedly connected with a sealing valve (602), the inside of the gas passage (601) is fixedly connected with a condenser pipe (603), and the top end of the condenser pipe (603) is fixedly connected with a condenser (604).

6. A heat treatment apparatus for processing a steel for high stress ships according to claim 5, characterized in that: The bottom end of the condenser pipe (603) in the gas passage (601) is fixedly connected with a discharging passage (605), the discharging passage (605) is in communication with the gas passage (601), the side surface of the discharging passage (605) is fixedly connected with a backflow passage (606), the backflow passage (606) is located above the quenching oil tank (5), and the inside of the discharging passage (605) is movably connected with a filter plate (607).

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