Quenching furnace for metal heat treatment

Abstract

The application belongs to the field of quenching furnaces and provides a quenching furnace for metal heat treatment, which comprises a base, a quenching pool and a hoisting mechanism, the top of the base is fixedly provided with a bottom furnace, the bottom furnace is slidably provided with a top furnace, the inside of the bottom furnace and the top furnace is provided with a heating pipe, the base is further provided with a first adjusting assembly, the output end of the first adjusting assembly is drivingly connected with the top furnace, and the first adjusting assembly is used to drive the top furnace to lift. The application sets the bottom furnace and the movable top furnace, adjusts the position of the top furnace when quenching workpieces of different lengths, shortens the height of the hearth, reduces the idle area of the hearth, avoids increasing consumption and wasting energy, sets the adjustable cage, adjusts the length of the workpiece, vertically places the workpiece on the adjustable cage, and avoids the creep deformation of the lifting appliance itself and the increase of energy consumption caused by the suspension heating of the lifting appliance.

Description

Technical Field

[0001] This invention belongs to the field of quenching furnaces, and particularly relates to a quenching furnace for metal heat treatment. Background Technology

[0002] Metal heat treatment is a process that involves heating a metal or alloy workpiece to a suitable temperature in a specific medium, holding it at that temperature for a certain time, and then cooling it at different rates in different media. By altering the microstructure of the metal's surface or interior, its properties can be controlled. Metal heat treatment requires a quenching furnace, which is a furnace that uses electricity, gas, or liquid as fuel. Its primary purpose is to heat workpieces that need to be quenched. Depending on the workpiece being treated, quenching furnaces are mainly classified into box furnaces, pit furnaces, bogie furnaces, continuous furnaces, and vacuum furnaces.

[0003] Pit furnaces are mainly used to process workpieces with longer lengths. However, the depth of the furnace chamber in traditional pit furnaces is fixed. When processing short workpieces, the upper space of the furnace chamber is idle, resulting in significant heat loss and energy waste. Furthermore, long workpieces usually need to be suspended for heating by a hanger. The hanger itself is subjected to tensile stress at high temperatures for a long time, which can easily cause creep deformation. At the same time, the hanger occupies the effective height of the furnace chamber, which increases energy consumption. Summary of the Invention

[0004] The purpose of this invention is to provide a quenching furnace for metal heat treatment, which aims to solve the technical problems in the prior art where the upper space of the furnace is left unused, resulting in energy waste, and the workpiece is suspended by a hanger for heating, leading to increased energy consumption.

[0005] The present invention is implemented as follows: a quenching furnace for metal heat treatment includes a base, a quenching pool and a hoisting mechanism. A bottom furnace is fixedly installed on the top of the base, and a top furnace is slidably installed on the bottom furnace. Heating tubes are provided inside both the bottom furnace and the top furnace. A first adjusting component is also installed on the base. The output end of the first adjusting component is connected to the top furnace via a transmission. The first adjusting component is used to drive the top furnace to rise and fall.

[0006] The bottom furnace is equipped with an adjustable cage for placing workpieces, and the height of the cage can be adjusted according to the length of the workpieces.

[0007] The hoisting mechanism is located to the side of the quenching tank and the base, and the output end of the hoisting mechanism is located above the quenching tank and the base. The hoisting mechanism is used to drive the adjustable cage to move, realize the loading of the adjustable cage, and transfer it between the quenching tank and the base.

[0008] A further technical solution: The top furnace contains multiple heating tubes, which are distributed at equal intervals.

[0009] Further technical solution: The first adjustment component includes a first servo motor fixedly mounted on the base, the output shaft of the first servo motor is fixedly connected to a first lead screw, and the first lead screw is threadedly connected to the top furnace.

[0010] Further technical solution: The adjustable cage includes a top plate and a bottom support plate. A plurality of guide cylinders are fixedly connected to the top of the bottom support plate, and a plurality of guide rods adapted to the guide cylinders are fixedly connected to the bottom of the top plate. One end of the guide rod is inserted into the guide cylinder and slidably installed with the guide cylinder. A second adjustment component is connected between the top plate and the bottom support plate. The second adjustment component is used to adjust the distance between the top plate and the bottom support plate.

[0011] A bottom fixing plate is fixedly installed on the bottom support plate. Limiting turntables are rotatably installed on the top of the bottom fixing plate and the bottom of the top plate. Corresponding first insertion holes are opened on both the bottom fixing plate and the top plate. Corresponding second insertion holes that are adapted to the first insertion holes are opened on both limiting turntables. A locking mechanism is installed on the top plate. The output end of the locking mechanism is connected to both limiting turntables. The locking mechanism is used to drive the two limiting turntables to rotate synchronously so as to lock the workpiece between the first insertion hole and the second insertion hole.

[0012] A further technical solution: A space is left between the bottom fixing plate and the bottom support plate.

[0013] Further technical solution: The second adjustment component includes a screw cylinder, which is fixedly installed on the bottom support plate. A screw rod is threadedly connected inside the screw cylinder. One end of the screw rod extends out of the screw cylinder, passes through the top plate, and is rotatably installed on the top plate. A crank handle is fixedly connected to the top of the top plate.

[0014] Further technical solution: The locking mechanism includes a connecting square tube and a telescopic square tube. The connecting square tube is fixedly installed on the lower limiting turntable. The telescopic square tube is inserted into and slides inside the limiting turntable. The telescopic square tube is fixedly installed on the upper limiting turntable. One end of the telescopic square tube passes through the top plate and is fixedly installed with a worm gear. A worm is rotatably installed on the top plate, and the worm gear and the worm wheel are meshed together.

[0015] Further technical solution: The hoisting mechanism includes a gantry frame and a detachable connection structure. The gantry frame is installed on the side of the base and the quenching tank. A sliding block is slidably installed on the top of the gantry frame, and a winding reel is rotatably installed on the bottom of the sliding block. A steel wire rope is wound on the winding reel. The detachable connection structure includes an upper connection part and a lower connection part. The upper connection part is connected to one end of the steel wire rope, and the lower connection part is installed on the top of the adjustable cage. The upper connection part and the lower connection part can be detachably connected.

[0016] A second servo motor is also fixedly installed at the bottom of the slide block. The output shaft of the second servo motor is fixedly connected to one end of the winding reel. A drive mechanism is also installed on the slide block, which is used to drive the slide block to move along the gantry frame.

[0017] Further technical solution: The upper connecting part includes a lifting cylinder, which is fixedly connected to the end of the wire rope. The end of the lifting cylinder is provided with a movable groove, and the side of the movable groove is provided with an installation groove. A limit block is slidably installed in the installation groove. A compression spring is connected between the limit block and the installation groove. The end of the limit block that extends into the movable groove is provided with an inclined surface.

[0018] The lower connecting part includes a mounting bracket, which is fixedly connected to the top of the top plate. A fixing post is fixedly connected to the top of the mounting bracket. The diameter of the fixing post is not greater than the diameter of the movable groove. A release ring is fitted on the fixing post. The release ring has inclined surfaces on both its upper and lower surfaces. The outer diameter of the release ring is the same as the diameter of the fixing post. A hemispherical head is fixedly connected to the top of the fixing post. A receiving groove adapted to the release ring is formed at the bottom of the hemispherical head. When the release ring is in the receiving groove, the horizontal mid-surface of the release ring is flush with the bottom of the hemispherical head. The diameter of the hemispherical head is the same as the diameter of the fixing post.

[0019] Further technical solution: The base has an installation cavity, a fan is installed in the installation cavity, the bottom of the furnace has a stepped groove, the output end of the fan extends into the stepped groove, the top of the stepped groove is covered, and the cover has several air holes communicating with the stepped groove.

[0020] Both the bottom furnace and the top furnace have spiral grooves inside.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. This invention, by setting up a bottom furnace and a movable top furnace, allows for adjustment of the top furnace position when quenching workpieces of different lengths, thereby shortening the furnace height, reducing idle areas in the furnace, and avoiding increased consumption and energy waste. Simultaneously, by setting up an adjustable hanging cage, which can be adjusted according to the length of the workpiece, the workpiece can be placed vertically on the adjustable hanging cage, thus avoiding the creep deformation of the hanging device itself caused by the hanging device being suspended for heating, which would increase energy consumption.

[0023] 2. This invention, by setting multiple heating tubes inside the top furnace, can maximize energy utilization and avoid energy waste by activating the heating tubes in the area where the top furnace does not overlap with the bottom furnace, depending on the position of the top furnace.

[0024] 3. This invention, by setting a detachable connection structure, can automatically connect and disconnect from the adjustable cage without manual operation, and avoids the creep deformation of the hoist itself caused by the hoist being suspended in the furnace, which would increase energy consumption. By setting a furnace cover, heat leakage in the furnace can be reduced, thus reducing energy waste.

[0025] 4. In this invention, by setting up a fan and a spiral groove, the fan can force the gas circulation in the bottom furnace, causing the gas to rise rapidly along the spiral groove. After rising to the top of the top furnace, the gas will flip and flow downward through the adjustable cage. When passing the workpiece, the airflow will exchange heat with the workpiece, causing the workpiece to be heated quickly. When the airflow flows back to the bottom of the bottom furnace, it will be driven by the fan to circulate again. This cycle ensures that the workpiece is heated evenly, eliminates temperature differences, and reduces workpiece deformation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall rear view structure of the present invention.

[0027] Figure 2 This is a structural schematic diagram of the overall front cross-section of the present invention.

[0028] Figure 3 In this invention Figure 2 Enlarged diagram of point A in the middle.

[0029] Figure 4 This is a schematic diagram of the adjustable cage in this invention.

[0030] Figure 5 This is a schematic diagram of the cross-sectional structure of the adjustable cage in this invention.

[0031] Figure 6 In this invention Figure 5 Enlarged diagram of point B in the middle.

[0032] Figure 7 This is a schematic diagram of the cross-sectional structure of the hoisting mechanism during hoisting in this invention.

[0033] In the attached diagram: 1. Quenching pool; 2. Base; 3. First adjusting component; 31. First servo motor; 32. First lead screw; 4. Bottom furnace; 5. Top furnace; 6. Furnace cover; 7. Lifting mechanism; 71. Slide seat; 72. Winding reel; 73. Wire rope; 74. Second servo motor; 75. Detachable connection structure; 751. Lifting cylinder; 752. Movable groove; 753. Hemispherical head; 754. Receiving groove; 755. Tie rod; 756. Compression spring; 757. Limiting block; 758. Releasing ring; 759. Fixed column; 7 510. Mounting bracket; 76. Second lead screw; 77. Third servo motor; 78. Gantry frame; 8. Adjustable cage; 81. Top plate; 82. First insertion hole; 83. Second insertion hole; 84. Guide rod; 85. Telescopic square tube; 86. Guide tube; 87. Connecting square tube; 88. Limiting turntable; 89. Bottom fixing plate; 810. Bottom support plate; 811. Screw; 812. Screw barrel; 813. Worm gear; 814. Worm wheel; 815. Handle; 9. Cover; 10. Stepped groove; 11. Fan; 12. Spiral groove. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0035] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0036] like Figures 1-7 As shown, a quenching furnace for metal heat treatment provided by the present invention includes a base 2, a quenching pool 1 and a hoisting mechanism 7. A bottom furnace 4 is fixedly installed on the top of the base 2, and a top furnace 5 is slidably installed on the bottom furnace 4. Heating tubes are provided inside both the bottom furnace 4 and the top furnace 5. A first adjusting component 3 is also installed on the base 2. The output end of the first adjusting component 3 is connected to the top furnace 5 in a transmission manner. The first adjusting component 3 is used to drive the top furnace 5 to rise and fall.

[0037] The bottom furnace 4 is equipped with an adjustable cage 8, which is used to place workpieces and can be adjusted in height according to the length of the workpieces.

[0038] The hoisting mechanism 7 is located on the side of the quenching tank 1 and the base 2. The output end of the hoisting mechanism 7 is located above the quenching tank 1 and the base 2. The hoisting mechanism 7 is used to drive the adjustable cage 8 to move, realize the loading of the adjustable cage 8, and transfer it between the quenching tank 1 and the base 2.

[0039] Specifically, a guide frame is provided on the base 2, and a guide strip is provided on the top furnace 5 to ensure the stable lifting and lowering of the top furnace 5. In addition, a high-temperature resistant sealing structure is provided between the top furnace 5 and the bottom furnace 4 to prevent heat leakage inside the furnace.

[0040] The adjustable cage 8 is hoisted to the outside of the bottom furnace 4 by the hoisting mechanism 7. Then, the height of the adjustable cage 8 is adjusted according to the length of the workpiece, and the workpiece is placed vertically on the adjustable cage 8. The adjustable cage 8 fixes the workpiece. Then, the adjustable cage 8 is hoisted into the bottom furnace 4. According to the height of the adjustable cage 8, the position of the top furnace 5 is adjusted by the first adjustment component 3 so that the top of the top furnace 5 is just higher than the top of the adjustable cage 8. Then, the heating tubes in the bottom furnace 4 and the top furnace 5 can be started to heat the workpiece, thereby avoiding excess idle space in the top furnace 5, which would increase consumption and cause energy waste.

[0041] After heating is complete, the adjustable cage 8 is lifted out and lowered into the quenching tank 1. Quenching liquid is poured into the quenching tank 1 to quench the workpiece.

[0042] The present invention provides a quenching furnace for metal heat treatment. When the position of the top furnace 5 is adjusted, there will be an overlapping area between the top furnace 5 and the bottom furnace 4. The inner wall of the top furnace 5 is attached to the outer wall of the bottom furnace 4 in this area. Therefore, the heat generated in the overlapping area cannot be transferred into the furnace, resulting in energy waste. In this embodiment, there are multiple heating tubes in the top furnace 5, and the multiple heating tubes are distributed at equal intervals.

[0043] Specifically, the length of the heating tubes can be set to be smaller, but the stacking of multiple heating tubes must be able to fill the interior of the top furnace 5. Therefore, after adjusting the position of the top furnace 5, it is only necessary to turn on the heating tubes in the area of ​​the top furnace 5 that does not overlap with the bottom furnace 4 to maximize energy utilization and avoid energy waste.

[0044] The present invention provides a quenching furnace for metal heat treatment. In this embodiment, the first adjustment component 3 includes a first servo motor 31 fixedly installed on the base 2. The output shaft of the first servo motor 31 is fixedly connected to a first lead screw 32, and the first lead screw 32 is threadedly connected to the top furnace 5.

[0045] Start the first servo motor 31, which drives the first lead screw 32 to rotate. The first lead screw 32 drives the top furnace 5 to rise and fall, thereby adjusting the distance between the top of the top furnace 5 and the bottom furnace 4, and thus adjusting the height of the quenching furnace.

[0046] The present invention provides a quenching furnace for metal heat treatment. In this embodiment, the adjustable cage 8 includes a top plate 81 and a bottom support plate 810. A plurality of guide cylinders 86 are fixedly connected to the top of the bottom support plate 810, and a plurality of guide rods 84 adapted to the guide cylinders 86 are fixedly connected to the bottom of the top plate 81. One end of the guide rod 84 is inserted into the guide cylinder 86 and slidably installed with the guide cylinder 86. A second adjustment component is connected between the top plate 81 and the bottom support plate 810. The second adjustment component is used to adjust the distance between the top plate 81 and the bottom support plate 810.

[0047] A bottom fixing plate 89 is fixedly installed on the bottom support plate 810. Limiting turntables 88 are rotatably installed on the top of the bottom fixing plate 89 and the bottom of the top plate 81. The bottom fixing plate 89 and the top plate 81 are each provided with a corresponding first insertion hole 82. The two limiting turntables 88 are each provided with a corresponding second insertion hole 83 that matches the first insertion hole 82. A locking mechanism is installed on the top plate 81. The output end of the locking mechanism is connected to both limiting turntables 88. The locking mechanism is used to drive the two limiting turntables 88 to rotate synchronously so as to lock the workpiece between the first insertion hole 82 and the second insertion hole 83.

[0048] Specifically, first, based on the length of the workpiece, the distance between the top plate 81 and the bottom support plate 810 is adjusted using the second adjustment component so that the distance between the top plate 81 and the bottom support plate 810 is less than the length of the workpiece. Then, the second insertion hole 83 and the first insertion hole 82 are aligned (the axes of the first insertion hole 82 and the second insertion hole 83 coincide). The workpiece is passed through the first insertion hole 82 on the top plate 81 and inserted into the first insertion hole 82 on the bottom fixing plate 89. The workpiece is then placed vertically. Then, the locking mechanism is operated, which drives the two limiting turntables 88 to rotate, so that the second insertion hole 83 on the limiting turntable 88 gradually shifts away from the first insertion hole 82. The workpiece is then clamped between the first insertion hole 82 and the second insertion hole 83 and is in a vertical position. Finally, the adjustable cage 8 can be hoisted into the interior of the bottom furnace 4.

[0049] Since the end of the workpiece rests against the bottom support plate 810 and is not suspended in the air, the slight stretching or bending deformation that may occur due to the weight of the slender workpiece at high temperature is avoided. Furthermore, since both the first insertion hole 82 and the second insertion hole 83 are circular, the contact between the top plate 81, the limiting turntable 88, and the bottom fixing plate 89 and the workpiece is point contact, thereby avoiding uneven heating of the workpiece caused by obstruction, thus resulting in better quenching quality of the workpiece.

[0050] The present invention provides a quenching furnace for metal heat treatment. In this embodiment, a space is left between the bottom fixing plate 89 and the bottom support plate 810 to facilitate the placement of workpieces.

[0051] One end of the workpiece passes through the first insertion hole 82 on the bottom fixing plate 89 and falls onto the bottom support plate 810. Heat passes through the gap between the bottom support plate 810 and the bottom fixing plate 89 to heat the end of the workpiece, ensuring the quenching quality of the workpiece.

[0052] The present invention provides a quenching furnace for metal heat treatment. In this embodiment, the second adjusting component includes a screw barrel 812, which is fixedly installed on a bottom support plate 810. A screw rod 811 is threadedly connected to the inside of the screw barrel 812. One end of the screw rod 811 extends out of the screw barrel 812, passes through a top plate 81, and is rotatably installed on the top plate 81. A crank handle 815 is fixedly connected to the top of the top plate 81.

[0053] Turning the crank handle 815 causes the screw 811 to rotate, which in turn screws the screw into or out of the screw barrel 812, and causes the top plate 81 to rise or fall, thereby adjusting the distance between the top plate 81 and the bottom support plate 810.

[0054] The present invention provides a quenching furnace for metal heat treatment. In this embodiment, the locking mechanism includes a connecting square tube 87 and a telescopic square tube 85. The connecting square tube 87 is fixedly installed on the lower limiting turntable 88. The telescopic square tube 85 is inserted into and slides inside the limiting turntable 88. The telescopic square tube 85 is fixedly installed on the upper limiting turntable 88. One end of the telescopic square tube 85 passes through the top plate 81 and is fixedly installed with a worm gear 814. A worm 813 is rotatably installed on the top plate 81, and the worm 813 and the worm gear 814 are meshed together.

[0055] Specifically, the connecting square tube 87 is located outside the screw tube 812, and the telescopic square tube 85 is located outside the screw 811.

[0056] The end of the worm 813 is provided with a concave drive groove, which can be driven by a tool. The worm 813 drives the worm wheel 814 to rotate, the worm wheel 814 drives the telescopic square tube 85 to rotate, and the telescopic square tube 85 drives the two limit turntables 88 and the connecting square tube 87 to rotate, thereby locking the workpiece.

[0057] When adjusting the distance between the top plate 81 and the bottom support plate 810, the telescopic square tube 85 can also move relative to the connecting square tube 87, so as to avoid interference with the adjustment of the distance between the top plate 81 and the bottom support plate 810.

[0058] The present invention provides a quenching furnace for metal heat treatment. In this embodiment, the hoisting mechanism 7 includes a gantry frame 78 and a detachable connection structure 75. The gantry frame 78 is installed on the side of the base 2 and the quenching pool 1. A slide block 71 is slidably installed on the top of the gantry frame 78, and a winding reel 72 is rotatably installed on the bottom of the slide block 71. A steel wire rope 73 is wound on the winding reel 72. The detachable connection structure 75 includes an upper connection part and a lower connection part. The upper connection part is connected to one end of the steel wire rope 73, and the lower connection part is installed on the top of the adjustable cage 8. The upper connection part and the lower connection part can be detachably connected.

[0059] A second servo motor 74 is also fixedly installed at the bottom of the slide block 71. The output shaft of the second servo motor 74 is fixedly connected to one end of the winding reel 72. A drive mechanism is also installed on the slide block 71. The drive mechanism is used to drive the slide block 71 to move along the gantry frame 78.

[0060] Specifically, the sliding block 71 is moved by the drive mechanism, and the sliding block 71 can move the upper connecting part to the top of the adjustable cage 8. Then, the second servo motor 74 drives the winding reel 72 to rotate, releasing the wire rope 73. The wire rope 73 drives the upper connecting part to descend. When the upper connecting part contacts the lower connecting part, the upper connecting part and the lower connecting part are connected. Then, the second servo motor 74 can drive the winding reel 72 to wind up the wire rope 73, driving the adjustable cage 8 to rise, so as to move the adjustable cage 8 into the bottom furnace 4 or the quenching pool 1.

[0061] The drive mechanism includes a third servo motor 77 and a second lead screw 76. The third servo motor 77 is fixedly mounted on the gantry frame 78 and is fixedly connected to the output shaft of the third servo motor 77. The second lead screw 76 is threadedly connected to the slide block 71.

[0062] Of course, the drive mechanism is not limited to the one mentioned above; it can also be other devices that can provide linear motion power.

[0063] To prevent heat leakage inside the furnace, a furnace cover 6 is hinged to the top of the top furnace 5. A bracket is provided on the side of the top furnace 5 to support the furnace cover 6. The bracket can lift the furnace cover 6 to prevent the angle between the furnace cover 6 and the top of the top furnace 5 from being too large, which would make it difficult to close the furnace cover 6.

[0064] The present invention provides a quenching furnace for metal heat treatment. In this embodiment, the upper connecting part includes a lifting cylinder 751, which is fixedly connected to the end of a wire rope 73. The end of the lifting cylinder 751 is provided with a movable groove 752, and the side of the movable groove 752 is provided with an installation groove. A limiting block 757 is slidably installed in the installation groove. A compression spring 756 is connected between the limiting block 757 and the installation groove. The end of the limiting block 757 that extends into the movable groove 752 is provided with an inclined surface.

[0065] The lower connecting part includes a mounting bracket 7510, which is fixedly connected to the top of the top plate 81. A fixing post 759 is fixedly connected to the top of the mounting bracket 7510. The diameter of the fixing post 759 is not greater than the diameter of the movable groove 752. A release ring 758 is sleeved on the fixing post 759. The upper and lower surfaces of the release ring 758 are both provided with inclined surfaces. The outer diameter of the release ring 758 is the same as the diameter of the fixing post 759. A hemispherical head 753 is fixedly connected to the top of the fixing post 759. The bottom of the hemispherical head 753 is provided with a receiving groove 754 that is adapted to the release ring 758. When the release ring 758 is in the receiving groove 754, the horizontal mid-surface of the release ring 758 is flush with the bottom of the hemispherical head 753. The diameter of the hemispherical head 753 is the same as the diameter of the fixing post 759.

[0066] Specifically, to prevent the limiting block 757 from jamming, a pull rod 755 is fixedly connected to the side of the limiting block 757 away from the center of the lifting cylinder 751. One end of the pull rod 755 extends out of the lifting cylinder 751. When the limiting block 757 is jammed, the pull rod 755 can be pulled or pushed to release the jamming of the limiting block 757.

[0067] During connection, the wire rope 73 drives the lifting cylinder 751 to descend, so that the hemispherical head 753 and the fixed column 759 are inserted into the movable groove 752. Then, the inclined surface of the limiting block 757 will contact the surface of the hemispherical head 753. Under the weight of the lifting cylinder 751 and the compression of the hemispherical head 753, the limiting block 757 will retract into the mounting groove. When the limiting block 757 passes the hemispherical head 753, under the action of the compression spring 756, the limiting block 757 extends out of the mounting groove and is stuck between the hemispherical head 753 and the release ring 758. At this time, the adjustable cage 8 can be lifted by the lifting mechanism 7. Then the limiting block 757 will abut against the bottom of the hemispherical head 753 and drive the hemispherical head 753 to move synchronously, thus realizing the connection between the upper connecting part and the lower connecting part.

[0068] After the adjustable cage 8 is hoisted, continue releasing the wire rope 73. The wire rope 73 drives the lifting cylinder 751 to descend. Under the weight of the lifting cylinder 751, the inclined surface of the limiting block 757 presses against the inclined surface of the release ring 758. Under the reaction force, the limiting block 757 is squeezed into the mounting groove. After passing the release ring 758, the limiting block 757 extends again and abuts against the lower inclined surface of the release ring 758. At this time, the wire rope 73 is raised, and the wire rope 73 drives the lifting cylinder 751 to rise. The lifting cylinder 751 will drive the release ring 758 to rise. When the release ring... After the upper part of 758 enters the receiving groove 754, the release ring 758 is blocked. When the lifting cylinder 751 drives the limiting block 757 to continue to rise, the limiting block 757 is squeezed into the installation groove by the reaction force. Then the limiting block 757 will pass over the release ring 758 and the hemispherical head 753 and leave the hemispherical head 753, so that the fixed column 759 will be withdrawn from the movable groove 752, realizing the separation of the upper connection part and the lower connection part. Then the furnace cover 6 can be closed to heat the workpiece, which also avoids heat leakage in the furnace and saves energy.

[0069] The present invention provides a quenching furnace for metal heat treatment. In order to achieve rapid and uniform heating of the workpiece, in this embodiment, the base 2 has an installation cavity, the installation cavity is equipped with a fan 11, the bottom of the furnace 4 has a stepped groove 10, the output end of the fan 11 extends into the stepped groove 10, the top of the stepped groove 10 is equipped with a cover 9, and the cover 9 has a plurality of air holes communicating with the stepped groove 10.

[0070] To ensure uniform heat transfer, spiral grooves 12 are provided inside both the bottom furnace 4 and the top furnace 5.

[0071] Specifically, the fan blades of the fan 11 extend into the stepped groove 10, the diameter of the cover 9 is larger than the diameter of the bottom support plate 810, and several air holes are arranged in a ring array. The outer diameter of the ring air holes is larger than the diameter of the bottom support plate 810, so that the airflow in the stepped groove 10 can smoothly enter the bottom furnace 4.

[0072] In use, the fan 11 forces the gas circulation in the bottom furnace 4, causing the gas to rise rapidly along the spiral groove 12 and carry away the heat from the inner surfaces of the bottom furnace 4 and the top furnace 5. After the gas rises to the top of the top furnace 5, it is blocked by the furnace cover 6. At this time, the gas will turn over and flow downward through the adjustable hanging cage 8. When passing the workpiece, the airflow will exchange heat with the workpiece, so that the workpiece is heated quickly. When the airflow flows back to the bottom of the bottom furnace 4, it is driven to circulate again by the fan 11. This cycle ensures that the workpiece is heated evenly, eliminates temperature differences, and reduces workpiece deformation.

[0073] Working principle:

[0074] The adjustable cage 8 is hoisted to the ground by the hoisting mechanism 7. The height of the adjustable cage 8 is adjusted according to the length of the workpiece. The workpiece is then placed on the adjustable cage 8 and fixed. The adjustable cage 8 is then hoisted into the bottom furnace 4, so that the upper and lower connecting parts of the detachable connecting structure 75 are separated. According to the height of the adjustable cage 8, the position of the top furnace 5 is adjusted by the first adjusting component 3 so that the top of the top furnace 5 is just higher than the top of the adjustable cage 8. Then the furnace cover 6 is closed, and the heating tubes in the bottom furnace 4 and the top furnace 5 can be started. At the same time, the fan 11 is started to heat the workpiece evenly.

[0075] After heating is complete, open the furnace cover 6 and lift the adjustable cage 8 out using the hoisting mechanism 7. Then, lift the adjustable cage 8 into the quenching tank 1 for quenching. Finally, lift the adjustable cage 8 to the ground and remove the workpiece from the adjustable cage 8.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0077] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A quenching furnace for metal heat treatment, comprising a base, a quenching tank, and a hoisting mechanism, characterized in that, A bottom furnace is fixedly installed on the top of the base, and a top furnace is slidably installed on the bottom furnace. Heating tubes are provided inside both the bottom furnace and the top furnace. A first adjustment component is also installed on the base. The output end of the first adjustment component is connected to the top furnace drive. The first adjustment component is used to drive the top furnace to rise and fall. The bottom furnace is equipped with an adjustable cage for placing workpieces, and the height of the cage can be adjusted according to the length of the workpieces. The hoisting mechanism is located to the side of the quenching tank and the base, and the output end of the hoisting mechanism is located above the quenching tank and the base. The hoisting mechanism is used to move the adjustable cage.

2. The quenching furnace for metal heat treatment according to claim 1, characterized in that, The top furnace contains multiple heating tubes, which are distributed at equal intervals.

3. The quenching furnace for metal heat treatment according to claim 1, characterized in that, The first adjustment component includes a first servo motor fixedly mounted on the base, the output shaft of the first servo motor being fixedly connected to a first lead screw, and the first lead screw being threadedly connected to the top furnace.

4. The quenching furnace for metal heat treatment according to claim 1, characterized in that, The adjustable cage includes a top plate and a bottom support plate. A plurality of guide cylinders are fixedly connected to the top of the bottom support plate, and a plurality of guide rods adapted to the guide cylinders are fixedly connected to the bottom of the top plate. One end of each guide rod is inserted into a guide cylinder and slidably installed with the guide cylinder. A second adjustment component is connected between the top plate and the bottom support plate. The second adjustment component is used to adjust the distance between the top plate and the bottom support plate. A bottom fixing plate is fixedly installed on the bottom support plate. Limiting turntables are rotatably installed on the top of the bottom fixing plate and the bottom of the top plate. Corresponding first insertion holes are opened on both the bottom fixing plate and the top plate. Corresponding second insertion holes that are adapted to the first insertion holes are opened on both limiting turntables. A locking mechanism is installed on the top plate. The output end of the locking mechanism is connected to both limiting turntables. The locking mechanism is used to drive the two limiting turntables to rotate synchronously so as to lock the workpiece between the first insertion hole and the second insertion hole.

5. The quenching furnace for metal heat treatment according to claim 4, characterized in that, There is a space between the bottom fixing plate and the bottom support plate.

6. The quenching furnace for metal heat treatment according to claim 4, characterized in that, The second adjustment component includes a screw cylinder, which is fixedly mounted on a bottom support plate. A screw rod is threadedly connected to the inside of the screw cylinder. One end of the screw rod extends out of the screw cylinder, passes through a top plate, and is rotatably mounted on the top plate. A crank handle is fixedly connected to the top of the top plate.

7. The quenching furnace for metal heat treatment according to claim 4, characterized in that, The locking mechanism includes a connecting square tube and a telescopic square tube. The connecting square tube is fixedly installed on the lower limiting turntable. The telescopic square tube is inserted into and slides inside the limiting turntable. The telescopic square tube is fixedly installed on the upper limiting turntable. One end of the telescopic square tube passes through the top plate and is fixedly installed with a worm gear. A worm is rotatably installed on the top plate, and the worm gear and the worm wheel are meshed together.

8. The quenching furnace for metal heat treatment according to claim 1, characterized in that, The hoisting mechanism includes a gantry frame and a detachable connection structure. The gantry frame is installed on the side of the base and the quenching tank. A slide block is slidably installed on the top of the gantry frame, and a winding reel is rotatably installed on the bottom of the slide block. A steel wire rope is wound on the winding reel. The detachable connection structure includes an upper connection part and a lower connection part. The upper connection part is connected to one end of the steel wire rope, and the lower connection part is installed on the top of the adjustable cage. The upper connection part and the lower connection part can be detachably connected. A second servo motor is also fixedly installed at the bottom of the slide block. The output shaft of the second servo motor is fixedly connected to one end of the winding reel. A drive mechanism is also installed on the slide block, which is used to drive the slide block to move along the gantry frame.

9. The quenching furnace for metal heat treatment according to claim 8, characterized in that, The upper connecting part includes a lifting cylinder, which is fixedly connected to the end of the wire rope. The end of the lifting cylinder is provided with a movable groove, and the side of the movable groove is provided with an installation groove. A limit block is slidably installed in the installation groove. A compression spring is connected between the limit block and the installation groove. The end of the limit block that extends into the movable groove is provided with an inclined surface. The lower connecting part includes a mounting frame, which is fixedly connected to the top of the adjustable cage. A fixed column is fixedly connected to the top of the mounting frame. The diameter of the fixed column is not greater than the diameter of the movable groove. A release ring is fitted on the fixed column. The release ring has inclined surfaces on both its upper and lower surfaces. The outer diameter of the release ring is the same as the diameter of the fixed column. A hemispherical head is fixedly connected to the top of the fixed column. A receiving groove adapted to the release ring is formed at the bottom of the hemispherical head. When the release ring is in the receiving groove, the horizontal mid-surface of the release ring is flush with the bottom of the hemispherical head. The diameter of the hemispherical head is the same as the diameter of the fixed column.

10. The quenching furnace for metal heat treatment according to claim 1, characterized in that, The base has an installation cavity, in which a fan is installed. The bottom of the furnace has a stepped groove, and the output end of the fan extends into the stepped groove. A cover is installed on the top of the stepped groove, and the cover has several air holes communicating with the stepped groove. Both the bottom furnace and the top furnace have spiral grooves inside.

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