Multi-station intermediate frequency induction quenching heat treatment equipment and heat treatment method thereof
Patent Information
- Application Number
- CN202611468242.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-21
- Publication Date
- 2026-10-27
AI Technical Summary
[0003]然而，此类设备在实际应用中，在冷却阶段的质量稳定性不足
显著改善了淬火冷却的均匀性，有效避免了传统喷水冷却方式因喷口流量不均而导致的软点和硬度偏差问题，通过在升降喷水筒内侧设置喷水缝，并在喷水缝下侧安装阻水装置，当通入冷却水后，阻水装置在水压作用下向内侧弹性变形并贴合工件外壁，从而在升降喷水筒内壁、工件外壁与阻水装置之间形成临时蓄水腔。喷水缝持续向该蓄水腔内喷射冷却水，使工件待淬火部位完全浸泡在流动翻滚的冷却水中，而非仅依靠喷射冲击进行冷却。这种浸泡式加流动搅动的冷却方式使得工件圆周方向各部位与冷却水的接触状态高度一致，从而确保冷却速度均匀，有效提高淬火后工件表面硬度的均匀性，并显著减少因冷却不均引起的工件变形。
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Figure CN122979581A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of metal heat treatment technology, and in particular to a multi-station medium-frequency induction quenching heat treatment equipment and its treatment method. Background Technology
[0002] Medium-frequency induction hardening is widely used for surface strengthening of mechanical parts such as gears and shafts due to its rapid heating speed, small heat-affected zone, and ease of automation. With the expansion of production batches, single-station reciprocating hardening methods are no longer sufficient to meet high-efficiency requirements, leading to the development of multi-station induction hardening equipment. Existing technologies include hardening devices that utilize rotary tables to achieve multi-station layouts. These devices sequentially transfer workpieces to the heating and quenching stations via a turntable, aiming to shorten auxiliary time and improve overall cycle time.
[0003] However, in practical applications, such equipment suffers from insufficient quality stability during the cooling stage. Existing equipment generally uses water spray rings or radial nozzles to directly spray cooling water onto the workpiece surface for quenching and cooling. Since the water flow rate and spray angle of each nozzle are difficult to be completely consistent, the cooling intensity in the circumferential direction of the same cross section of the workpiece is uneven, which can easily lead to local soft spots or hardness deviations, and in severe cases, it can even cause the workpiece to twist and deform.
[0004] For asymmetrical workpieces with toothed or keyway structures, the contact state between different parts of the surface and the cooling water varies more significantly during liquid spray cooling, making the uniformity problem more severe. Therefore, how to effectively improve the uniformity of quenching cooling while ensuring continuous and efficient operation at multiple stations has become a pressing technical challenge in this field. Summary of the Invention
[0005] To overcome the technical defects of the existing technology, the present invention provides a multi-station medium-frequency induction quenching heat treatment equipment and its treatment method, which improves the uniformity of quenching and cooling.
[0006] The technical solution adopted in this invention is: A multi-station medium-frequency induction hardening heat treatment equipment includes a workpiece rotation system, a heating system, a lifting water spray system, a frame, and a cooling water circulation system. The workpiece rotation system is mounted on the frame, and the heating system is also mounted on the frame. The lifting water spray system includes a lifting water spray pipe, a lifting water spray cylinder, an air supply device, and a water blocking device. The cooling water circulation system is connected to the lifting water spray pipe. The lifting water spray cylinder is installed at the bottom of the lifting water spray pipe and is hollow, forming a through-tube shape. The lifting water spray pipe connects to the lifting water spray cylinder, and a water spray slit is provided on the inner side of the lifting water spray cylinder. The water blocking device is installed inside the lifting water spray cylinder and is located below the water spray slit. The lifting water spray pipe is slidably mounted on the frame in the lifting direction. The water blocking device deforms inward towards the lifting water spray cylinder after water is supplied. The air supply device is installed on the upper side of the lifting water spray cylinder and seals the upper side of the lifting water spray cylinder.
[0007] Preferably, the workpiece rotation system includes a station rotation device and several workpiece rotation devices. The station rotation device includes an indexer and a station turntable. The station turntable is mounted on the output end of the indexer, and the indexer is mounted on the frame. Each workpiece rotation device is evenly distributed and mounted on the station turntable around the rotation axis of the station turntable. Each workpiece rotation device includes a workpiece rotation motor and a workpiece turntable. The workpiece rotation motor is mounted on the station turntable, and the workpiece turntable is mounted on the output end of the workpiece rotation motor.
[0008] Preferably, the heating system includes a heating column, a heating horizontal movement device, a heating lifting device, and a heating coil. The heating lifting device is mounted on the heating horizontal movement device, the heating horizontal movement device is mounted on the heating column, and the heating coil is mounted on the heating lifting device.
[0009] Preferably, the frame is provided with a water storage tank, and the workpiece rotation system is installed on the upper side of the water storage tank.
[0010] Preferably, the cooling water circulation system includes a water circulation hose and a water circulation pump. The water circulation pump is installed in a water storage tank, the water circulation hose is installed at the output end of the water circulation pump, and the water circulation hose is connected to a lifting spray pipe.
[0011] Preferably, the outer wall of the lifting water spray pipe is provided with a rack, the frame is equipped with a water pipe lifting motor, the output end of the water pipe lifting motor is provided with a lifting gear, and the lifting gear meshes with the rack.
[0012] Preferably, the air supply device includes a sealing rubber sheet and an air supply pipe, wherein the sealing rubber sheet is installed around the top of the lifting water spray cylinder, and the air supply pipe is installed on the sealing rubber sheet.
[0013] Preferably, the water-blocking device includes a water-blocking rubber ring and an annular pressure plate. The water-blocking rubber ring is installed inside the lifting water spray cylinder through the annular pressure plate. The lifting water spray cylinder has a water pressure transmission channel at the corresponding position of the water-blocking rubber ring.
[0014] Preferably, the water spray slit is inclined downward at 45 degrees relative to the horizontal plane.
[0015] A multi-station medium-frequency induction hardening heat treatment method, using multi-station medium-frequency induction hardening heat treatment equipment, includes the following steps: S1: The workpiece to be processed is installed on the workpiece rotation system, and the workpiece is moved sequentially to the lower side of the heating system and the lower side of the lifting water spray cylinder through the workpiece rotation system. S2: When the workpiece is located below the heating system, the workpiece is subjected to medium-frequency induction heating through the heating system; S3: The heated workpiece is moved to the lower side of the lifting water spray cylinder, and the lifting water spray pipe is controlled to slide down along the frame so that the lifting water spray cylinder is sleeved on the outer periphery of the part of the workpiece to be quenched. S4: Start the cooling water circulation system to introduce cooling water into the lifting water spray pipe and the lifting water spray cylinder. The cooling water is sprayed onto the surface of the workpiece through the spray seam. At the same time, the water blocking device located below the spray seam is elastically deformed towards the inside of the lifting water spray cylinder under the action of water pressure until it fits against the outer wall of the workpiece, thereby forming a temporary water storage cavity between the inner wall of the lifting water spray cylinder, the outer wall of the workpiece and the water blocking device. S5: After the water blocking device is in contact with the workpiece, the air supply device is activated to supply air to the upper side of the lifting water spray cylinder. The gas pressure is used to overcome the contact force of the water blocking device and squeeze the cooling water in the temporary water storage chamber out of the gap between the water blocking device and the workpiece. At the same time, the water spraying seam continues to spray water to replenish it, so that the part of the workpiece to be quenched is soaked in flowing cooling water until uniform quenching is completed. S6: After quenching is completed, the cooling water circulation system and air supply device are shut off, the water blocking device is elastically reset, and the lifting water spray pipe is controlled to rise and reset. The workpiece rotation system continues to move the next heated workpiece to the lower side of the lifting water spray cylinder. S1 to S6 are executed in a cycle to achieve multi-station continuous quenching treatment.
[0016] The beneficial effects of this invention are: This method significantly improves the uniformity of quenching cooling, effectively avoiding the soft spots and hardness deviations caused by uneven nozzle flow in traditional water spray cooling methods. By setting a water spray slit inside the lifting water spray cylinder and installing a water-blocking device below the slit, when cooling water is introduced, the water-blocking device elastically deforms inward under water pressure and adheres to the outer wall of the workpiece, thus forming a temporary water storage cavity between the inner wall of the lifting water spray cylinder, the outer wall of the workpiece, and the water-blocking device. The water spray slit continuously sprays cooling water into this storage cavity, ensuring that the workpiece to be quenched is completely immersed in the flowing and turbulent cooling water, rather than relying solely on jet impact for cooling. This immersion-plus-flow-agitation cooling method ensures a highly consistent contact state between all parts of the workpiece and the cooling water in the circumferential direction, thereby ensuring uniform cooling speed, effectively improving the uniformity of the surface hardness of the workpiece after quenching, and significantly reducing workpiece deformation caused by uneven cooling.
[0017] By coordinating the air supply device and the water blocking device, the cooling water discharge flow rate can be controlled and adjusted, further improving the stability and adaptability of the quenching process. The air supply device supplies air to the upper side of the lifting spray cylinder, using gas pressure to overcome the adhesion force between the water blocking device and the workpiece, squeezing out the accumulated cooling water from the gap. The gap size can be controlled by adjusting the air supply pressure, thereby controlling the cooling water discharge flow rate and immersion time. This mechanism allows workpieces of different materials and sizes to obtain suitable cooling parameters, broadening the process applicability of the equipment.
[0018] The water spray slit is tilted downwards at a 45-degree angle, which allows the cooling water to form a swirling flow after being sprayed onto the workpiece surface. This further promotes the uniform agitation of the cooling water in the water storage chamber, avoids local water temperature rise, and maintains the activity and cooling capacity of the cooling water, thereby further improving the stability of the quenching effect. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.
[0020] Figure 2 This is a schematic cross-sectional view of the structure before the lifting water spray system starts spraying water.
[0021] Figure 3 This is a cross-sectional view of the structure of the lifting water spray system during water spraying.
[0022] Explanation of reference numerals in the attached figures: 1. Workpiece rotation system; 11. Station rotation device; 111. Indexer; 112. Station rotary table; 12. Workpiece rotation device; 121. Workpiece rotation motor; 122. Workpiece rotary table; 2. Heating system; 21. Heating column; 22. Heating horizontal movement device; 23. Heating lifting device; 25. Heating coil; 3. Lifting water spray system; 31. Lifting water spray pipe; 32. Lifting water spray cylinder; 321. Sealed air chamber; 322. Water spray gap; 323. Temporary water storage chamber; 325. Water pressure transmission channel; 33. Air supply device; 331. Sealing rubber sheet; 332. Air supply pipe; 35. Water blocking device; 351. Water blocking rubber ring; 352. Annular pressure plate; 3521. Adaptive opening; 3522. Screw; 4. Rack; 5. Workpiece. Detailed Implementation
[0023] The present invention will be further described below with reference to the accompanying drawings: like Figure 1 — Figure 3 As shown, this embodiment provides a multi-station medium-frequency induction hardening heat treatment equipment, including a workpiece rotation system 1, a heating system 2, a lifting water spray system 3, a frame 4, and a cooling water circulation system. The workpiece rotation system 1 is mounted on the frame 4, carrying the workpieces 5 at each station and driving them sequentially into the heating and hardening positions. The heating system 2 is mounted on the frame 4 and performs medium-frequency induction heating on the workpieces 5 that have moved to the heating station. The lifting water spray system 3 includes a lifting water spray pipe 31, a lifting water spray cylinder 32, an air supply device 33, and a water blocking device 35. The cooling water circulation system is connected to the lifting water spray pipe 31, continuously supplying cooling water to the lifting water spray pipe 31 and recycling it. The lifting water spray cylinder 32 is installed at the bottom of the lifting water spray pipe 31, allowing the cooling water in the lifting water spray pipe 31 to enter the lifting water spray cylinder 32. The lifting water spray cylinder 32 is annular. The lifting water spray cylinder 32 is hollow, which facilitates the formation of cooling water channels and temporary water storage space inside. The lifting water spray cylinder 32 is a through-tube shape, which facilitates the insertion of the part to be quenched from the outside of the workpiece 5, and forms an annular cooling space between its inner wall and the outer wall of the workpiece 5. The lifting water spray pipe 31 is connected to the lifting water spray cylinder 32, ensuring that the cooling water can smoothly enter the lifting water spray cylinder 32 from the lifting water spray pipe 31. The inner side of the lifting water spray cylinder 32 is provided with a water spray slit 322, which is used to spray the cooling water out from the water spray slit 322 and spray it onto the surface of the workpiece 5 to be quenched. The water blocking device 35 is installed inside the lifting water spray cylinder 32, forming an elastically deformable water blocking structure inside the lifting water spray cylinder 32. The water blocking device 35 is located below the water spray slit 322, forming a temporary water storage cavity 323 between the water spray slit 322 and the workpiece 5, so that the cooling water can stay briefly and soak the workpiece 5.
[0024] Specifically, the lifting water spray pipe 31 is slidably mounted on the frame 4 in the lifting direction, facilitating the lifting of the lifting water spray cylinder 32 and accurately fitting it onto the outside of the workpiece 5. The water-blocking device 35 deforms inwards towards the lifting water spray cylinder 32 after water is supplied, using water pressure to adaptively conform to the workpiece 5, forming a water-storage seal. The air supply device 33 is installed on the upper side of the lifting water spray cylinder 32, used to supply pressurized gas into the upper part of the lifting water spray cylinder 32. The air supply device 33 seals the upper side of the lifting water spray cylinder 32, ensuring that the air pressure can act on the temporary water storage chamber 323 and control the flow of cooling water from the water-blocking device 31. The gap between workpiece 5 and workpiece 5 allows for drainage, enabling multi-station continuous cyclic quenching through the workpiece rotation system 1, improving production efficiency and achieving continuous operation. The water-storage immersion cooling structure, formed by the lifting water spray cylinder 32 and the water-blocking device 35, immerses the quenching area of workpiece 5 in flowing cooling water, improving cooling uniformity. While ensuring high-efficiency production, this improves quenching cooling uniformity, reduces local cooling differences caused by uneven spraying, enhances the consistency of microstructure transformation, and effectively avoids soft spots and deformation problems caused by uneven flow in traditional water spray cooling, thus improving the quenching quality and dimensional stability of workpiece 5.
[0025] Specifically, the workpiece rotation system 1 includes a station rotation device 11 and several workpiece rotation devices 12. Through the coordination of station rotation and workpiece 5 rotation, continuous multi-station conveying is achieved. The station rotation device 11 includes an indexer 111 and a station turntable 112, used for station indexing and rotational load bearing. The station turntable 112 is mounted on the output end of the indexer 111 and is driven by the indexer 111 to rotate in steps at a set angle. The indexer 111 is mounted on the frame 4, providing stable support and indexing power for the station turntable 112. Each workpiece rotation device 12 rotates around the station turntable 112. The axes are evenly distributed and installed on the station turntable 112, so that each workpiece 5 can enter the heating and quenching station in sequence. The workpiece rotation device 12 includes a workpiece rotation motor 121 and a workpiece turntable 122, which is used to drive the workpiece 5 to rotate around its own axis. The workpiece rotation motor 121 is installed on the station turntable 112, so that the workpiece rotation motor 121 moves synchronously with the station turntable 112. The workpiece turntable 122 is installed at the output end of the workpiece rotation motor 121, which drives the workpiece 5 to rotate continuously during the heating and cooling process, realizing the conveying of the workpiece 5 and the rotation of the workpiece 5 itself, ensuring that the workpiece 5 is heated and cooled more evenly in the circumferential direction.
[0026] Specifically, the heating system 2 includes a heating column 21, a heating horizontal movement device 22, a heating lifting device 23, and a heating coil 25. It is used to adjust the spatial position of the heating coil 25. The heating lifting device 23 is installed on the heating horizontal movement device 22, so that the heating coil 25 can be adjusted up and down. The heating horizontal movement device 22 is installed on the heating column 21, so that the heating coil 25 can be moved horizontally to the heating station. The heating coil 25 is installed on the heating lifting device 23, which moves it closer to or away from the workpiece 5, so as to realize the movement of the heating coil 25, which is convenient to adapt to the heating position and process cycle of different workpieces 5.
[0027] Specifically, the frame 4 is equipped with a water storage tank for receiving and temporarily storing the cooling water after spraying. The workpiece rotation system 1 is installed on the upper side of the water storage tank so that the cooling water after spraying can naturally fall back into the water storage tank, realizing the temporary storage of the coolant, facilitating the recycling of the cooling water and reducing overflow.
[0028] Specifically, the cooling water circulation system includes a water circulation hose and a water circulation pump to form a cooling water circulation supply loop. The water circulation pump is installed in the water storage tank to facilitate direct extraction of cooling water from the tank. The water circulation hose is installed at the output end of the water circulation pump to deliver pressurized cooling water to the lifting spray pipe 31. The water circulation hose is connected to the lifting spray pipe 31 to ensure a continuous and stable water supply to the lifting spray pipe 31. The water is reused through a commercially available filter to achieve a circulating supply of cooling water, maintain stable spray pressure and flow, and reduce water consumption.
[0029] Specifically, the outer wall of the lifting water spray pipe 31 is provided with a rack, which is used to cooperate with the gear to form a lifting transmission. The frame 4 is equipped with a water pipe lifting motor to provide lifting power for the lifting water spray pipe 31. The output end of the water pipe lifting motor is provided with a lifting gear, which converts the rotational motion of the water pipe lifting motor into the linear motion of lifting. The lifting gear meshes with the rack, and through meshing transmission, the lifting water spray pipe 31 is driven to rise and fall smoothly, ensuring stable guidance during the lifting process. This, in turn, drives the lifting water spray cylinder 32 to rise and fall and fit on the outside of the workpiece 5, so that the lifting water spray cylinder 32 is accurately fitted on the part of the workpiece 5 to be quenched.
[0030] Specifically, the air supply device 33 includes a sealing rubber sheet 331 and an air supply pipe 332, which are used to form a controllable air pressure on the upper side of the lifting water spray cylinder 32. The sealing rubber sheet 331 is installed around the top of the lifting water spray cylinder 32, so that a sealed air chamber 321 is formed on the upper side of the lifting water spray cylinder 32. The air supply pipe 332 is installed on the sealing rubber sheet 331 and is used to introduce pressurized gas into the sealed air chamber 321.
[0031] Specifically, the water-blocking device 35 includes a water-blocking rubber ring 351 and an annular pressure plate 352. The annular pressure plate 352 has an adaptive opening 3521, the width of which is 0.5 mm, 0.7 mm, or 1 mm. The annular pressure plate 352 uses several screws 3522 to install the water-blocking rubber ring 351 inside the lifting water spray cylinder 32 to form an elastic water-blocking and self-adaptive fitting structure. The water-blocking rubber ring 351 is installed inside the lifting water spray cylinder 32 by the annular pressure plate 352, so that the water-blocking rubber ring 351 is fixed and maintains an annular seal. The lifting water spray cylinder 32 has a water pressure transmission channel 325 at the corresponding position of the water-blocking rubber ring 351, which facilitates the transmission of water pressure to the water-blocking rubber ring 351 and causes it to deform, thereby realizing the deformation of the water-blocking rubber ring 351 under the action of water pressure, so that the water-blocking rubber ring 351 fits the workpiece 5 and forms a temporary water storage cavity 323.
[0032] Specifically, the water spray slit 322 is inclined downward at 45 degrees relative to the horizontal plane, so that the sprayed water flow impacts the surface of the workpiece 5 at an angle, thereby providing the power to agitate the water flow, enhance the disturbance and renewal of the cooling water, and improve the uniformity of quenching cooling.
[0033] A multi-station medium-frequency induction hardening heat treatment method, using multi-station medium-frequency induction hardening heat treatment equipment, includes the following steps: S1: The workpiece 5 to be processed is clamped and installed on the workpiece rotation system 1, and each workpiece 5 is moved sequentially to the lower side of the heating system 2 and the lower side of the lifting water spray cylinder 32 through the workpiece rotation system 1. S2: When the workpiece 5 is located below the heating system 2, the workpiece 5 is subjected to medium-frequency induction heating through the heating system 2; S3: The heated workpiece 5 is moved to the lower side of the lifting water spray cylinder 32, and the lifting water spray pipe 31 is controlled to slide down along the frame 4 so that the lifting water spray cylinder 32 is fitted on the outer periphery of the part of the workpiece 5 to be quenched. S4: Start the cooling water circulation system to introduce cooling water into the lifting water spray pipe 31 and the lifting water spray cylinder 32. The cooling water is sprayed onto the surface of the workpiece 5 through the water spray slit 322. At the same time, the water blocking device 35 located on the lower side of the water spray slit 322 is elastically deformed towards the inside of the lifting water spray cylinder 32 under the action of water pressure until it fits against the outer wall of the non-medium frequency processing position of the workpiece 5, thereby forming a temporary water storage cavity 323 between the inner wall of the lifting water spray cylinder 32, the outer wall of the workpiece 5 and the water blocking device 35. S5: After the water blocking device 35 is attached to the workpiece 5, the air supply device 33 is activated to supply air to the upper side of the lifting water spray cylinder 32. The gas pressure is used to overcome the adhesion force of the water blocking device 35 and squeeze the cooling water in the temporary water storage chamber 323 out from the gap between the water blocking device 35 and the workpiece 5. At the same time, the water spraying seam 322 continuously sprays water to replenish it, so that the part of the workpiece 5 to be quenched is soaked in flowing cooling water until uniform quenching is completed. S6: After quenching is completed, the cooling water circulation system and the air supply device 33 are shut off, the water blocking device 35 is elastically reset, and the lifting water spray pipe 31 is controlled to rise and reset. The workpiece rotation system 1 continues to move the next heated workpiece 5 to the lower side of the lifting water spray cylinder 32. S1 to S6 are executed in a cycle to achieve multi-station continuous quenching treatment.
[0034] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.
Claims
1. A multi-station medium-frequency induction hardening heat treatment equipment, characterized in that, The system includes a workpiece rotation system, a heating system, a lifting and water spraying system, a frame, and a cooling water circulation system. The workpiece rotation system and the heating system are mounted on the frame. The lifting and water spraying system includes a lifting water spray pipe, a lifting water spray cylinder, an air supply device, and a water blocking device. The cooling water circulation system is connected to the lifting water spray pipe. The lifting water spray cylinder is installed at the bottom of the lifting water spray pipe and is hollow, forming a through-tube shape. The lifting water spray pipe connects to the lifting water spray cylinder, and water spraying is provided on the inner side of the lifting water spray cylinder. The water-blocking device is installed inside the lifting water spray cylinder and is located below the water spray gap. The lifting water spray pipe is slidably installed on the frame in the lifting direction. The water-blocking device deforms inward into the lifting water spray cylinder after water is supplied. The air supply device is installed on the upper side of the lifting water spray cylinder and seals the upper side of the lifting water spray cylinder. The water-blocking device includes a water-blocking rubber ring and an annular pressure plate. The water-blocking rubber ring is installed inside the lifting water spray cylinder through the annular pressure plate. The lifting water spray cylinder has a water pressure transmission channel at the corresponding position of the water-blocking rubber ring.
2. The multi-station medium-frequency induction hardening heat treatment equipment according to claim 1, characterized in that, The workpiece rotation system includes a station rotation device and several workpiece rotation devices. The station rotation device includes an indexer and a station turntable. The station turntable is mounted on the output end of the indexer, and the indexer is mounted on the frame. Each workpiece rotation device is evenly distributed and mounted on the station turntable around the rotation axis of the station turntable. Each workpiece rotation device includes a workpiece rotation motor and a workpiece turntable. The workpiece rotation motor is mounted on the station turntable, and the workpiece turntable is mounted on the output end of the workpiece rotation motor.
3. The multi-station medium-frequency induction hardening heat treatment equipment according to claim 1, characterized in that, The heating system includes a heating column, a heating horizontal movement device, a heating lifting device, and a heating coil. The heating lifting device is mounted on the heating horizontal movement device, the heating horizontal movement device is mounted on the heating column, and the heating coil is mounted on the heating lifting device.
4. The multi-station medium-frequency induction hardening heat treatment equipment according to claim 1, characterized in that, The frame is equipped with a water storage tank, and the workpiece rotation system is installed on the upper side of the water storage tank.
5. The multi-station medium-frequency induction hardening heat treatment equipment according to claim 4, characterized in that, The cooling water circulation system includes a water circulation hose and a water circulation pump. The water circulation pump is installed in a water storage tank, and the water circulation hose is installed at the output end of the water circulation pump. The water circulation hose is connected to a lifting spray pipe.
6. The multi-station medium-frequency induction hardening heat treatment equipment according to claim 1, characterized in that, The outer wall of the lifting water spray pipe is provided with a rack, and a water pipe lifting motor is installed on the frame. The output end of the water pipe lifting motor is provided with a lifting gear, which meshes with the rack.
7. The multi-station medium-frequency induction hardening heat treatment equipment according to claim 1, characterized in that, The air supply device includes a sealing rubber sheet and an air supply pipe. The sealing rubber sheet is installed around the top of the lifting water spray cylinder, and the air supply pipe is installed on the sealing rubber sheet.
8. The multi-station medium-frequency induction hardening heat treatment equipment according to claim 1, characterized in that, The water spray slit is inclined downward at 45 degrees relative to the horizontal plane.
9. A multi-station medium-frequency induction hardening heat treatment method, using the multi-station medium-frequency induction hardening heat treatment equipment as described in claim 1, characterized in that, Includes the following steps: S1: The workpiece to be processed is installed on the workpiece rotation system, and the workpiece is moved sequentially to the lower side of the heating system and the lower side of the lifting water spray cylinder through the workpiece rotation system. S2: When the workpiece is located below the heating system, the workpiece is subjected to medium-frequency induction heating through the heating system; S3: The heated workpiece is moved to the lower side of the lifting water spray cylinder, and the lifting water spray pipe is controlled to slide down along the frame so that the lifting water spray cylinder is sleeved on the outer periphery of the part of the workpiece to be quenched. S4: Start the cooling water circulation system to introduce cooling water into the lifting water spray pipe and the lifting water spray cylinder. The cooling water is sprayed onto the surface of the workpiece through the spray seam. At the same time, the water blocking device located below the spray seam is elastically deformed towards the inside of the lifting water spray cylinder under the action of water pressure until it fits against the outer wall of the workpiece, thereby forming a temporary water storage cavity between the inner wall of the lifting water spray cylinder, the outer wall of the workpiece and the water blocking device. S5: After the water blocking device is in contact with the workpiece, the air supply device is activated to supply air to the upper side of the lifting water spray cylinder. The gas pressure is used to overcome the contact force of the water blocking device and squeeze the cooling water in the temporary water storage chamber out of the gap between the water blocking device and the workpiece. At the same time, the water spraying seam continues to spray water to replenish it, so that the part of the workpiece to be quenched is soaked in flowing cooling water until uniform quenching is completed. S6: After quenching is completed, the cooling water circulation system and air supply device are shut off, the water blocking device is elastically reset, and the lifting water spray pipe is controlled to rise and reset. The workpiece rotation system continues to move the next heated workpiece to the lower side of the lifting water spray cylinder. S1 to S6 are executed in a cycle to achieve multi-station continuous quenching treatment.