Heat treatment equipment and its heat treatment control process for high-toughness LNG ship 9% Ni steel forgings

Abstract

This invention discloses a heat treatment device and its heat treatment control process for high-toughness LNG ship 9%Ni steel forgings, belonging to the field of metal heat treatment. Addressing the problems of existing crane-based transport methods requiring manual intervention, posing corresponding risks, and the space requirements and difficulty in draining residual coolant from pipes, this invention proposes the following solution: It includes a transfer section, a cooling section, and a holding section connected in sequence to form a transport route. A placement basket, located at the top of the platform, is used to carry the pipes. Two tractors are used to move the placement basket between the platform and the transport route. In use, the dual tractors, in conjunction with a purely mechanically linked transfer mechanism, achieve fully automated transport of high-temperature pipes from the heating furnace to the cooling section and then to the holding section. This reduces the safety risks for operators approaching the high-temperature placement basket for hooking operations. Compared to traditional crane lifting methods, this device requires less manual scheduling.

Description

Technical Field

[0001] This invention relates to the field of metal heat treatment technology, and in particular to heat treatment apparatus and heat treatment control process for high-toughness LNG ship 9%Ni steel forgings. Background Technology

[0002] In the heat treatment process of 9%Ni steel forgings and pipe fittings for LNG ships, the process usually includes heating, cooling, and temporary storage or transfer after cooling. The common production line layout is to separate the heating furnace, cooling pool and storage area according to the process sequence. For the transfer of high-temperature workpieces after heating, one common practice in the field is to use a workshop bridge crane (crane) to lift the basket carrying the workpiece to the cooling station. Another practice is to use a forklift or similar handling equipment for ground transfer. When using a crane for hoisting, in some cases, operators need to approach the hot basket to perform the hooking operation, which poses certain safety risks. At the same time, the operation rhythm of the crane and the connection between the preceding and following processes depend on the operator's response and scheduling. In continuous production conditions, this can easily become one of the links that affect the overall production rhythm. Using ground vehicles such as forklifts for transfer avoids working at heights, but it places specific requirements on the width of the workshop aisles, the ground bearing capacity, and the turning space. In addition, for tubular workpieces, coolant may remain inside after the cooling process. If the posture is fixed during transfer or storage, the residual liquid is not easy to drain naturally. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies, such as the need for manual intervention when using cranes for transportation, the associated risks, the space requirements of forklifts, and the difficulty in draining residual coolant from pipes. The invention proposes a heat treatment device and a heat treatment control process for high-toughness LNG ship 9% Ni steel forgings.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: The heat treatment apparatus includes a heating mechanism, which comprises a heat treatment furnace body, a base platform, and a guide rail I adapted to the base platform, and further includes: The transfer section, cooling section, and dwell section connected in sequence form the transport route; A placement basket, located on top of the base platform, is used to support pipe fittings; Two towing vehicles are used to tow the baskets placed on the platform and move them along the transport route; The transfer mechanism is used to transfer the placement basket from the base to the transfer section, and finally to the dwell section; The transfer mechanism includes a transfer component mounted on the tractor, and at least one such component is provided. The transfer component includes a boom and a limiting guide rod. The transfer mechanism also includes a stopping component installed on the stopping section. The stopping component includes a fixed contact sensor I and multiple stopping stations arranged along the length. Each stopping station is equipped with an openable and closable contact sensor II.

[0005] In one possible design, the transition section, cooling section, and stopping section are provided with continuous guide rails II that cooperate with the tractor, and the base extends into the section of the guide rails II.

[0006] In one possible design, a positioning groove I corresponding to the limiting guide rod is provided on the base platform; The side wall of the placement basket is fixedly provided with a guide frame corresponding to the limiting guide rod and sleeved on the outer wall of the limiting guide rod. The limiting guide rod is slidably arranged along its own axis through the guide frame, and a limiting ring for limiting its own movement distance is fixedly sleeved on the outer wall of the limiting guide rod. The top end of the limiting guide rod is formed into a connecting section by bending. The top of the tractor is fixedly equipped with a base frame corresponding to the boom. A vertical pole is fixedly installed inside the base frame along its own height, and a lifting seat fixedly connected to one end of the boom is slidably sleeved on the outer wall of the vertical pole. The other end of the boom is bent to form a buckle end that cooperates with the connecting section.

[0007] In one possible design, the transfer component further includes two pedestals, both fixedly mounted on the transfer section and located respectively on the two tractor units; The side wall of the platform is provided with guide grooves corresponding to and connected in sequence with the boom. The guide grooves include a transverse guide groove for use as an inlet, a downward guide groove for avoiding the connecting section, and a lifting guide groove for resetting. A resetting groove for return is provided between the lifting guide groove and the transverse guide groove. An inclined baffle is rotatably provided at the connection between the transverse guide groove, the downward guide groove, and the resetting groove. The inclined baffle is provided with a torsion spring for its own upward rotation. The outer wall of the upright is fitted with a compression spring for the lifting seat to return to its upward position; The side wall of the lifting seat is fixedly provided with a guide rod that cooperates with the guide groove, and the outer wall of the guide rod is rotatably sleeved with a roller.

[0008] In one possible design, the connecting section is located on the side of the limiting guide rod away from the placement basket, so that the boom can be offset from the limiting guide rod during the return trip.

[0009] In one possible design, the cooling section includes a cooling pool located in the middle and cooperating with the placement basket, and side passages on both sides for the movement of the corresponding tractor. The bottom of the cooling pool is equipped with nozzle I for cooling water flow, and the side wall of the cooling pool is equipped with nozzle II for cooling the limiting guide rod located above the water level.

[0010] In one possible design, the placement basket is provided with a base plate, and the base plate is provided with a limiting grid for separating the pipes. A connecting seat that is rotatably connected to the side wall of the base plate is fixedly provided on one side of the placement basket. An outwardly extending abutment plate is fixedly provided on the side of the base plate opposite to the rotation point. A convex guide platform corresponding to the abutment plate is fixedly provided on the side wall of the cooling pool near the dwell section, and the inclination of the convex guide platform is greater than the slope of the cooling pool.

[0011] In one possible design, the stopping station is provided with a positioning groove II corresponding to the limiting guide rod; A fixed platform for mounting contact sensor I is fixedly installed on the dwell section; The station is equipped with a movable seat for mounting the contact sensor II; A connecting plate is provided below the stationary position. A pressure rod corresponding to the upper positioning groove II is fixedly provided on the top of the connecting plate, and the top end of the pressure rod slides into the positioning groove II. A tension spring for the connecting plate to reset upward is sleeved on the outer wall of the pressure rod. A pressure plate is fixedly provided on the connecting plate, and a pressing plate that cooperates with the pressure plate is fixedly provided at the bottom of the movable seat.

[0012] A heat treatment control process for high-toughness LNG ship 9% Ni steel forgings based on the heat treatment apparatus described in any one of the above, characterized by comprising the following steps: S1. Place the 9%Ni steel forging pipe to be processed in the limiting grid of the placement basket and place it on the bottom platform. Insert the limiting guide rod into the positioning groove I. S2. The placement basket is sent into the heat treatment furnace body through the conveying mechanism under the bottom platform, and heated and kept warm according to the preset process parameters. S3. After heating is complete, pull the basket back to the transfer position on the bottom platform, control the tractor and automatically complete the hooking action through the transfer mechanism; S4. Control the tractor to move in the opposite direction and pull the placement basket into the cooling section so that the placement basket is immersed in the liquid surface of the cooling pool for quenching and cooling. At the same time, open nozzle I and nozzle II to cool the pipe and the limit guide rod respectively. S5. After cooling is complete, control the tractor to continue pulling the placement basket uphill away from the cooling pool. The bottom plate inside the placement basket tilts under the action of the convex guide platform to drain the coolant remaining inside the pipe. S6. The tractor pulls the placement basket into the stopping section. When the contact sensor I is triggered, the tractor stops and moves in the opposite direction. The boom automatically disengages from the limit guide rod, and the limit guide rod is inserted into the positioning slot II of the stopping station to complete the automatic placement of the workpiece. S7. When a workstation is occupied, the contact sensor II at that workstation automatically rises. Subsequent basket placement triggers this sensor, and the control system guides the tractor to park the workpiece at the next available workstation.

[0013] In this application, during actual use, the placement basket is assembled on the base platform by a crane, and the placement basket and internal pipes are driven into the interior of the heat treatment furnace body by the traction mechanism at the bottom of the base platform for heating, and then moved out in the reverse direction after the heating is completed. By controlling the tractor to move to the side of the basket placement area, as the tractor moves and enters the platform area, the guide rod will enter the interior of the transverse guide groove and continue to move. When the guide rod moves to the end of the channel, the front reset groove is blocked by the inclined baffle, causing it to abut against the inclined baffle and move diagonally downward along the sliding guide groove. Simultaneously, the lifting seat and the corresponding boom will move downward along the upright, causing the boom to move downward in advance when it reaches one side of the connecting section, thus offsetting it. Until the guide rod enters the lifting guide groove from the sliding guide groove, the compression spring sleeved on the outer wall of the upright will exert force, causing... It drives the guide rod and boom to reset upward. When the boom moves upward, it will abut against the bent section of the limit guide rod, thereby pushing the limit guide rod to move upward. Its bottom end will disengage from the inside of the positioning groove I, releasing the limit between the placement basket and the base platform. The guide rod will move to the top of the lifting guide groove, and then control the tractor to move in the opposite direction. The buckle end will push the connecting section to move together, realizing the connection between the tractor and the placement basket, thereby driving the placement basket into the cooling section for cooling. The guide rod will move along the reset groove 815 and push the inclined baffle 812 to rotate, thereby moving out along the transverse guide groove 811. The two tractor units on both sides enter the side passage down the slope, while the middle placement basket enters the cooling pool down the slope. The boom will be located above the partition between the passage and the pool. When the placement basket and the internal pipes are immersed in water for water cooling, nozzle I can raise the flow of water in the pool, thereby increasing the cooling effect. The upper nozzle II is used to spray onto the upper section of the limit guide rod above the water level for cooling. After cooling is complete, the tractor will move the placement basket uphill. At this time, the placement basket will be tilted, and the branch pipe opening of the T-pipe will face downwards to drain the residual water inside. Then, it will continue to move, and the abutment plate will abut against the top of the convex guide platform, thereby pushing the abutment plate to tilt up. This will cause the bottom plate to tilt slightly along the side of the connecting seat to drain the residual water inside the main T-pipe. After it is separated from the convex guide platform, the bottom plate will naturally return to its original position by gravity. The tractor moves the placement basket to the end of the stopping section until the tractor or the placement basket touches the contact sensor I and stops. Then the tractor can be controlled to move in the opposite direction and reset to the transfer section. When the tractor resets, the boom will directly offset the vertical section of the limit guide rod and disengage from the bent section of the limit guide rod. The limit guide rod will move downward by gravity, so that its bottom end is inserted into the positioning groove II to limit the placement basket. When the basket is placed at the first stopping position, the limit guide rod will press the pressure rod downward. The pressure rod drives the pressure plate downward through the connecting plate. The pressure plate will press the protrusion of the pressing plate, causing it to rotate the movable seat. After the movable seat rotates upward and opens, its corresponding contact sensor II will be located in front of the second stopping position. If the next batch of pipe fittings has finished cooling and is being placed, but the previous batch of pipe fittings has not yet been removed by the crane, the contact sensor II at the second stopping position will be directly triggered, and the basket will automatically stop at the second stopping position. When not in use, the sensor will be hidden.

[0014] In this invention, the heat treatment device achieves automatic hooking and unhooking actions through the cooperation of the guide groove on the platform and the tractor boom. It does not require additional hydraulic or electric drive units, has a simple structure and high operational reliability. The convex guide platform and the rotatable base plate can automatically tilt and drain water during the process of placing the basket away from the cooling pool, reducing the phenomenon that the residual coolant inside the tubular workpiece is not easy to drain. In this invention, the heat treatment device can automatically identify vacant workstations and automatically park workpieces through mechanical linkage triggered by the limiting guide rod. When a certain workstation is occupied, the contact sensor II of that workstation will automatically stand up and be triggered by the subsequent workpiece. The control system can then guide the tractor to park the next batch of workpieces in the next vacant workstation without the need for manual intervention in workstation allocation. In this invention, during use, a dual-tractor unit combined with a purely mechanically linked transfer mechanism enables the automatic transfer of high-temperature pipe fittings from the heating furnace to the cooling section and then to the dwell section, reducing the safety risks for operators to approach the high-temperature storage basket for hooking operations. Compared with traditional crane lifting methods, this device requires less manual scheduling. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the heat treatment apparatus proposed in this invention; Figure 2 This is a schematic diagram of the heating mechanism of the heat treatment device proposed in this invention; Figure 3 For the present invention Figure 2 Enlarged view of the structure of section B; Figure 4 For the present invention Figure 1 Enlarged view of the structure of section A; Figure 5This is a schematic diagram of the transfer section structure of the heat treatment device proposed in this invention; Figure 6 This is a rear view schematic diagram of the heat treatment apparatus proposed in this invention; Figure 7 For the present invention Figure 6 Enlarged view of the structure of section E in the middle; Figure 8 For the present invention Figure 5 Enlarged view of the structure of section C; Figure 9 For the present invention Figure 5 Enlarged view of the structure of section D; Figure 10 This is a schematic diagram of the dwell station structure of the heat treatment apparatus proposed in this invention.

[0016] In the diagram: 1. Heating mechanism; 111. Heat treatment furnace body; 112. Guide rail I; 113. Base platform; 114. Positioning groove I; 211. Transfer section; 212. Cooling section; 2121. Side passage; 2122. Cooling pool; 213. Dwelling section; 3. Guide rail II; 4. Placement basket; 411. Base plate; 412. Limiting grid; 413. Guide frame; 414. Protruding guide platform; 415. Connecting seat; 416. Abutment plate; 5. Limiting guide rod; 511. Limiting ring; 512. Connecting section; 6. Traction vehicle; 7. Base frame; 711. Upright pole; 712. Lifting rod. 713. Lowering seat; 714. Boom; 715. Buckle end; 716. Roller; 717. Guide rod; 8. Platform; 811. Lateral guide groove; 812. Inclined baffle; 813. Sliding guide groove; 814. Lifting guide groove; 815. Reset groove; 911. Nozzle I; 912. Nozzle II; 1011. Fixed platform; 1012. Contact sensor I; 1013. Stop station; 1014. Positioning groove II; 1015. Pressure rod; 1016. Connecting plate; 1017. Tension spring; 1018. Pressure plate; 1019. Pressing plate; 1020. Movable seat. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] In one embodiment: a heat treatment apparatus for controlling the heat treatment process of 9% Ni steel forged pipe fittings for LNG ships, which can also be used for other types of pipe fittings, including: Heating mechanism 1, transport route, placement basket 4, tractor 6, and transfer mechanism.

[0019] refer to Figure 2The heating mechanism 1 includes a heat treatment furnace body 111, a base platform 113, and a guide rail I112 adapted to the base platform 113. The base platform 113 is usually made of heat-resistant concrete or steel structure with a flat surface. Its length extends out of the furnace opening of the heat treatment furnace body 111. The guide rail I112 is laid on the base platform 113 and is used to guide the carrier carrying the workpiece into and out of the furnace chamber.

[0020] refer to Figure 1 The transport route consists of a transfer section 211, a cooling section 212, and a stopping section 213 connected in sequence. The transfer section 211 is connected to the end of the base platform 113 of the heating mechanism. The cooling section 212 is used to quench and cool the heated workpiece. The stopping section 213 is used to temporarily store the cooled workpiece. Continuous guide rails II3 are provided on the transfer section 211, the cooling section 212, and the stopping section 213 to guide the movement of the tractor 6. The end of the base platform 113 extends into the starting section of the guide rails II3.

[0021] refer to Figure 7 The placement basket 4 is used to carry the pipes to be processed. The placement basket 4 is located on the top of the base platform 113. Rollers can be set at its bottom or on the transport route (not shown in the figure). The placement basket 4 is provided with a base plate 411. The base plate 411 is welded with a limiting grid 412 for separating the pipes to prevent the pipes from colliding with each other during movement. A connecting seat 415 is fixedly provided on one side of the placement basket 4. The corresponding side of the base plate 411 is rotatably connected to the connecting seat 415. On the other side opposite to the rotation point, an outwardly horizontally protruding abutment plate 416 is fixedly welded to the base plate 411.

[0022] refer to Figure 3-4 There are two tractor vehicles 6, located on both sides of the transport route, used to move the basket 4. The tractor vehicle 6 is an electric or hydraulically driven rail vehicle, and its wheels are connected to the guide rail II 3. The top of each tractor vehicle 6 is fixed with a base frame 7 by bolts. The base frame 7 is a steel frame structure.

[0023] The transfer mechanism is used to transfer the placement basket 4 from the base platform 113 to the transfer section 211 and finally position it on the dwell section 213. The transfer mechanism includes a transfer component installed on the tractor 6 and a parking component installed on the dwell section 213.

[0024] The main components include a boom 713 and a limiting guide rod 5. A vertical pole 711 is fixedly welded inside the base frame 7 along the vertical direction. A lifting seat 712 is slidably sleeved on the outer wall of the vertical pole 711. A linear bearing is embedded in the lifting seat 712 to ensure smooth sliding. One end of the boom 713 is welded and fixed to the side of the lifting seat 712, and the other end is bent to form a buckle end 714. A compression spring is sleeved on the vertical pole 711 below the lifting seat 712 to provide the lifting seat 712 with an upward restoring force. The compression spring needs to be inspected and replaced regularly to ensure that the lifting seat 712 is returned to the top position.

[0025] The limiting guide rod 5 is a round steel rod with a tapered bottom. On the base 113, a positioning groove corresponding to the expected falling position of the limiting guide rod 5 is machined. A guide frame 413 is welded and fixed to the side wall of the basket 4. A through hole is opened on the guide frame 413, through which the limiting guide rod 5 passes and can slide up and down along its own axis. A limiting ring 511 is fixedly sleeved on the outer wall of the limiting guide rod 5 to limit the upward sliding distance of the limiting guide rod 5. The top of the limiting guide rod 5 is bent to form a connecting section 512. The buckle end 714 of the arm 713 hooks the connecting section 512 from one side.

[0026] The transfer mechanism also includes two platforms 8 fixedly installed on both sides of the transfer section 211. Specific guide grooves are machined on the side walls of the platforms 8. The guide grooves include a horizontal guide groove 811, a downward guide groove 813, a lifting guide groove 814, and a reset groove 815 that are connected. The horizontal guide groove 811 is horizontally opened as an entrance. The downward guide groove 813 extends obliquely downward from the end of the horizontal guide groove 811. The lifting guide groove 814 extends vertically upward from the end of the downward guide groove 813. The reset groove 815 extends horizontally from the top of the lifting guide groove 814 to the position where it meets the horizontal guide groove 811. At the connection point of the horizontal guide groove 811, the downward guide groove 813, and the reset groove 815, an inclined baffle 812 is installed via a rotating shaft. In its natural state, the inclined baffle 812 is acted upon by a torsion spring, and its surface is inclined upward, blocking the entrance of the reset groove 815. A guide rod 716 is fixedly installed on the side of the lifting seat 712, and a roller 715 is installed at the end of the guide rod 716 via a bearing.

[0027] refer to Figure 5-8The cooling section 212 includes a cooling pool 2122 in the middle and side passages 2121 on both sides of the cooling pool 2122. The side passages 2121 are for the tractor 6 to travel. Multiple nozzles I 911 are evenly arranged at the bottom of the cooling pool 2122 to spray cooling water upwards and promote water flow. Above the side wall of the cooling pool 2122, nozzles II 912 are installed, and their spray direction is slightly towards the upward space. On the side wall of the cooling pool 2122 near the residence section 213, a convex guide platform 414 is fixedly installed. The upper surface of the convex guide platform 414 is inclined, and its inclination angle is greater than the slope of the side wall of the cooling pool 2122.

[0028] refer to Figure 9-10 The stopping section 213 is equipped with a stopping component, which includes a contact sensor I 1012 fixedly installed at the beginning of the stopping section 213, and multiple stopping stations 1013 arranged along the length direction. Each stopping station 1013 has a positioning groove II 1014 on its surface, the size of which is the same as the positioning groove I 114 on the base platform 113. A triggering mechanism is installed below the stopping station 1013. This mechanism includes a pressure rod 1015 that can slide up and down. The top end of the pressure rod 1015 slides into the positioning groove II 1014, and the bottom end of the pressure rod 1015 is fixedly connected to a connecting plate 1016. The connecting plate 1016 is connected to the fixed structure by a tension spring 1017, giving the connecting plate 1016 an upward tendency. A pressure plate 10 is fixed on the connecting plate 1016. 18. On the table of station 1013, a movable seat 1020 is installed via a pivot. The movable seat 1020 can rotate around a horizontal axis. A contact sensor II is installed on the movable seat 1020. A pressing plate 1019 is fixed to the bottom of the movable seat 1020, and its free end extends downward. When the pressing rod 1015 is not pressed down, the pressing plate 1018 is in a high position under the action of the tension spring 1017 and does not contact the pressing plate 1019. The movable seat 1020 is in a retracted state under its own weight or the action of the auxiliary torsion spring, and the contact sensor II on it is hidden. When the pressing rod 1015 is pressed down, it drives the pressing plate 1018 to move down. The pressing plate 1018 will press the pressing plate 1019, thereby causing the movable seat 1020 to rotate to an upright state, exposing the contact sensor II in front of the station.

[0029] This device also includes a PLC controller, which is electrically connected to the drive motor of the tractor 6, contact sensor I 1012, contact sensor II, the solenoid valve of the nozzle, and the conveying mechanism of the heat treatment furnace body 111. The PLC controller receives the trigger signals from contact sensor I and contact sensor II, and controls the start and stop of the tractor, the direction of travel, the opening and closing of the nozzle, and the operation of the conveying mechanism according to the preset program.

[0030] The motor and electrical control box of the tractor 6 can be wrapped with a heat insulation layer such as aluminum silicate, and the contact sensors are high-temperature resistant and waterproof.

[0031] The work process is as follows: Heating and transfer preparation: After the pipe fittings are loaded into the placement basket 4, they are placed at the feeding end of the base platform 113 by a crane. They are then fed into the heat treatment furnace body 111 for heating via a chain or push rod mechanism (not shown in the figure) under the base platform 113. After heating is completed, the basket is pulled back to the transfer position of the base platform 113. The bottom end of the limiting guide rod 5 is located in the positioning groove I 114, which fixes the placement basket 4 relative to the base platform 113. The two traction vehicles 6 move from the initial position along the guide rail II 3 to the transfer section 211 and continue to move towards the base platform 113.

[0032] Automatic hook-up: When the tractor 6 moves to the area of ​​the platform 8, the guide rod 716 and roller 715 on it enter the transverse guide groove 811 and continue to move forward. When the roller 715 reaches the end of the transverse guide groove 811, the entrance of the reset groove 815 in front is blocked by the inclined baffle 812. The roller 715 will abut against the inclined baffle 812 and roll diagonally downward along the sliding guide groove 813, thereby forcing the lifting seat 712 to slide downward along the upright 711, compressing the compression spring below it. The boom 713 then descends, and the height of its buckle end 714 decreases, thereby avoiding the connecting section 512. When the roller 715 enters the bottom of the vertical lifting guide groove 814 from the sliding guide groove 813, the compression spring is released, pushing the lifting seat 712 upward. The buckle end 714 of the boom 713 rises from below and abuts against the limiting guide rod 5, and pushes the limiting guide rod 5 upward as a whole, so that its bottom end is disengaged from the positioning groove I114.

[0033] Traction Movement and Cooling: After the limiting guide rod 5 disengages from the positioning groove I114, the limiting of the placement basket 4 and the base platform 113 is released, and the tractor 6 is controlled to move in the opposite direction (i.e., move towards the cooling section 212). At this time, the buckle end 714 of the boom 713 hooks the connecting section 512, driving the limiting guide rod 5 and the entire placement basket 4 to move together. After the roller 715 rises to the top along the lifting guide groove 814, it enters the reset groove 815 and pushes the inclined baffle 812 to rotate against the torsion spring force, thereby disengaging from the transverse guide groove 811. The tractor 6 pulls the placement basket 4 into the cooling section 212. The tractors 6 on both sides enter the side passage 2121 along the track, while the placement basket 4 in the middle slides down the slope into the cooling pool 2122 for quenching and cooling. The nozzle I 911 works to enhance the uniformity of cooling. The nozzle II 912 is set to protect the limiting guide rod 5. Since the upper part of the limiting guide rod 5 will be exposed to the air and cannot enter the water, it is cooled by the nozzle II 912.

[0034] Drainage and continued movement: After cooling is completed, the tractor 6 pulls the placement basket 4 uphill away from the cooling pool 2122. During the uphill process, the placement basket 4 naturally tilts due to the height difference between the front and rear, and the branch pipe openings of the fittings (such as tees) face downwards, allowing the residual water inside to be initially drained. When the placement basket 4 moves to near the top of the slope, the abutment plate 416 will contact the inclined surface of the convex guide platform 414 fixed to the top of the pool wall. Under the guidance of the convex guide platform 414, the abutment plate 416 is lifted upwards, thereby forcing the bottom plate 411 to tilt slightly to the side around the hinge point of the connecting seat 415, so that the main pipe opening of the fittings also faces the lower position, further draining the residual water in the main pipe. After leaving the convex guide platform 414, the bottom plate 411 returns to its original position under its own weight.

[0035] Automatic parking and unhooking: The tractor 6 pulls the placement basket 4 into the stopping section 213 and moves towards the end. When the placement basket 4 or the tractor 6 triggers the fixed contact sensor I 1012, the tractor 6 stops. At this time, the tractor 6 is controlled to move in the opposite direction (i.e., return to the direction of the transfer section 211). In the initial stage of the return, since the connecting section 512 of the limit guide rod 5 is bent away from the placement basket 4, when the boom 713 moves horizontally backward with the tractor 6, the buckle end 714 will slide off the connecting section 512 and separate from the limit guide rod 5. The limit guide rod 5 falls under the action of gravity, and its bottom end is inserted into the positioning groove II 1014 of the current stopping position 1013, realizing the positioning of the placement basket 4 in the stopping section 213.

[0036] Station dwell state switching: When the limit guide rod 5 is inserted into the positioning slot II 1014, its bottom end presses down the pressure rod 1015. The pressure rod 1015 drives the pressure plate 1018 to move down through the connecting plate 1016. The pressure plate 1018 presses down the pressing plate 1019, driving the movable seat 1020 to rotate to the upright state, exposing the contact sensor II on the station. If the placement basket 4 on the station has not been lifted away, and the next batch of workpieces has been cooled and needs to enter the dwell section, the subsequent placement basket 4 will trigger the already erected contact sensor II. The control system will guide the tractor 6 to automatically park the placement basket 4 in the next empty dwell station 1013. When all the placement baskets 4 on the station have been lifted away, the pressure rod 1015 is reset under the action of the tension spring 1017, and the movable seat 1020 rotates and retracts under its own weight, and the sensor is hidden.

[0037] The boom 713 can be equipped with reinforcing ribs or foot supports as needed (in this embodiment, reinforcing ribs are used).

[0038] This application can be used in the field of metal heat treatment, or in other fields applicable to this application.

[0039] In another embodiment: Reference Figure 4The heat treatment device is applied to the field of metal heat treatment. The structure of this embodiment is basically the same as that of the previous embodiment. The difference is that: in the previous embodiment, each tractor 6 is equipped with a transfer component, that is, a boom 713 and a limiting guide rod 5. This setting is suitable for placing baskets 4 with relatively light loads or short lengths.

[0040] In this embodiment, for a placement basket 4 that carries heavy workpieces or is long, in order to provide more stable traction and transfer force, two transfer components can be set on a single tractor 6. The two transfer components are arranged back and forth along the travel direction of the tractor 6. The horizontal distance between the base frame 7 and the limiting guide rod 5 of the transfer component located at the rear (i.e. closer to the heating mechanism 1) is smaller than that between the front and rear components, so as to avoid the rear transfer component from contacting the corresponding structure of the front transfer component when it moves.

[0041] However, as is well known to those skilled in the art, the working principles and wiring methods of the heating mechanism 1, the traction mechanism, and the sensor are all conventional means or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0042] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A heat treatment apparatus, comprising a heating mechanism (1), said heating mechanism (1) comprising a heat treatment furnace body (111), a base platform (113), and a guide rail I (112) adapted to the base platform (113), characterized in that, Also includes: The transfer section (211), cooling section (212), and dwell section (213) connected in sequence form a transport route; Placement basket (4), located on top of base (113), for supporting pipe fittings; Two towing vehicles (6) are used to tow the basket (4) on the platform (113) and along the transport route; The transfer mechanism is used to transfer the placement basket (4) from the base (113) to the transfer section (211) and finally to the dwell section (213); The transfer mechanism includes a transfer component installed on the tractor (6), and at least one such component is provided. The transfer component includes a boom (713) and a limiting guide rod (5). The transfer mechanism also includes a stop component set on the stopping section (213), the stop component including a fixed contact sensor I (1012) and a plurality of stopping stations (1013) arranged along the length, the stopping station (1013) being provided with an openable and closable contact sensor II.

2. The heat treatment apparatus according to claim 1, characterized in that, The transition section (211), cooling section (212) and stopping section (213) are provided with continuous guide rails II (3) that cooperate with the tractor (6), and the base platform (113) extends into the section of the guide rails II (3).

3. The heat treatment apparatus according to claim 1, characterized in that, The base (113) is provided with a positioning groove I (114) corresponding to the limiting guide rod (5); The side wall of the placement basket (4) is fixedly provided with a guide frame (413) corresponding to the limiting guide rod (5) and sleeved on the outer wall of the limiting guide rod (5). The limiting guide rod (5) is slidably arranged along its own axis through the guide frame (413), and the outer wall of the limiting guide rod (5) is fixedly sleeved with a limiting ring (511) for limiting its own movement distance. The top end of the limiting guide rod (5) is formed by bending to form a connecting section (512). The top of the tractor (6) is fixedly provided with a base frame (7) corresponding to the boom (713). The base frame (7) is fixedly provided with a pole (711) along its own height. The outer wall of the pole (711) is slidably fitted with a lifting seat (712) fixedly connected to one end of the boom (713). The other end of the boom (713) is bent to form a buckle end (714) that cooperates with the connecting section (512).

4. The heat treatment apparatus according to claim 3, characterized in that, The transfer component also includes two fixedly mounted platforms (8) located on the two tractors (6) respectively. The side wall of the platform (8) is provided with guide grooves corresponding to and connected in sequence with the boom (713). The guide grooves include a transverse guide groove (811) for use as an inlet, a downward guide groove (813) for avoiding the connecting section (512) and a lifting guide groove (814) for resetting. A resetting groove (815) is provided between the lifting guide groove (814) and the transverse guide groove (811) for return. An inclined baffle (812) is rotatably provided at the connection of the transverse guide groove (811), the downward guide groove (813) and the resetting groove (815). The inclined baffle (812) is provided with a torsion spring for rotating upward on its own. The outer wall of the upright (711) is fitted with a compression spring for the lifting seat (712) to return to its upward position; The side wall of the lifting seat (712) is fixedly provided with a guide rod (716) that cooperates with the guide groove, and the outer wall of the guide rod (716) is rotatably sleeved with a roller (715).

5. The heat treatment apparatus according to claim 4, characterized in that, The connecting section (512) is located on the side of the limiting guide rod (5) away from the placement basket (4) and is used for the boom (713) to deviate from the limiting guide rod (5) during the return trip.

6. The heat treatment apparatus according to claim 3, characterized in that, The cooling section (212) includes a cooling pool (2122) located in the middle and cooperating with the placement basket (4), and side passages (2121) on both sides for the movement of the corresponding tractor (6). The bottom of the cooling pool (2122) is provided with a nozzle I (911) for cooling water flow, and the side wall of the cooling pool (2122) is provided with a nozzle II (912) for cooling the limiting guide rod (5) located above the water level.

7. The heat treatment apparatus according to claim 6, characterized in that, The placement basket (4) is provided with a base plate (411), and the base plate (411) is provided with a limiting grid (412) for separating pipes. A connecting seat (415) is fixedly provided on one side of the placement basket (4) and is rotatably connected to the side wall of the base plate (411). An outwardly extending abutment plate (416) is fixedly provided on the side of the base plate (411) opposite to the rotation point. A convex guide platform (414) corresponding to the abutment plate (416) is fixedly provided on the side wall of the cooling pool (2122) near the dwell section (213), and the inclination of the convex guide platform (414) is greater than the slope of the cooling pool (2122).

8. The heat treatment apparatus according to claim 3, characterized in that, The station (1013) is provided with a positioning groove II (1014) corresponding to the limiting guide rod (5); A fixed platform (1011) for mounting contact sensor I (1012) is fixedly provided on the dwell section (213). The station (1013) is rotatably equipped with a movable seat (1020) for installing the contact sensor II. A connecting plate (1016) is provided below the dwell station (1013). A pressure rod (1015) corresponding to the upper positioning groove II (1014) is fixedly provided on the top of the connecting plate (1016). The top end of the pressure rod (1015) slides into the positioning groove II (1014). A tension spring (1017) for the connecting plate (1016) to reset upward is sleeved on the outer wall of the pressure rod (1015). A pressure plate (1018) is fixedly provided on the connecting plate (1016). A pressing plate (1019) that cooperates with the pressure plate (1018) is fixedly provided at the bottom of the movable seat (1020).

9. A heat treatment control process for high-toughness LNG ship 9% Ni steel forgings based on the heat treatment apparatus according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Place the 9%Ni steel forging pipe to be processed in the limiting grid (412) of the placement basket (4) and place it on the base platform (113). Insert the limiting guide rod (5) into the positioning groove I (114). S2. The placement basket (4) is sent into the heat treatment furnace body (111) through the conveying mechanism under the bottom platform (113) and heated and kept warm according to the preset process parameters. S3. After heating is complete, pull the placement basket (4) back to the transfer position of the bottom platform (113), control the tractor (6) and automatically complete the hooking action through the transfer mechanism; S4. Control the tractor (6) to move in the opposite direction and pull the placement basket (4) into the cooling section (212) so that the placement basket (4) is immersed in the cooling pool (2122) for quenching and cooling. At the same time, open nozzle I (911) and nozzle II (912) to cool the pipe and the limiting guide rod (5) respectively. S5. After cooling is completed, control the tractor (6) to continue to pull the placement basket (4) uphill and away from the cooling pool (2122). The bottom plate (411) inside the placement basket (4) tilts under the action of the convex guide (414) to discharge the coolant remaining inside the pipe. S6. The tractor (6) pulls the placement basket (4) into the stopping section (213). When the contact sensor I (1012) is triggered, the tractor (6) stops and moves in the opposite direction. The boom (713) automatically disengages from the limit guide rod (5). The limit guide rod (5) is inserted into the positioning groove II (1014) of the stopping station (1013) to complete the automatic placement of the workpiece. S7. When the station (1013) is occupied, the contact sensor II of the station will automatically stand up. After the subsequent placement basket (4) triggers the sensor, the control system guides the tractor (6) to place the workpiece in the next available station (1013).

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