A quenching device for transmission shaft production with dual-stage cooling function

Abstract

The present invention relates to the field of heat treatment technology for transmission shafts, and discloses a quenching device for transmission shaft production with a two-stage cooling function. By arranging a primary water-cooling ring and a secondary air-cooling seat in the two-stage cooling device, the coolant ejected from the primary water-cooling ring and the cooling airflow ejected from the secondary air-cooling seat are guided by the coolant discharge structure and the airflow descaling structure in the two-stage cooling device respectively. The airflow descaling structure is used to guide the cooling airflow to spray upwards, thereby removing water stains remaining on the transmission shaft. This solves the problem that water cooling easily leaves residual water stains, which affects the cooling uniformity, and that impurities in the water stains affect the quenching effect. At the same time, the airflow can also accelerate the discharge speed of the coolant. The invention has the advantages of combining water cooling and air cooling according to the characteristics of the transmission shaft, and improving the cooling uniformity while ensuring the cooling rate.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment and quenching of transmission shafts, in particular to a quenching device for transmission shaft production with a two-stage cooling function. Background Art

[0002] In the production and manufacturing of drive shafts, heat treatment, particularly the medium-frequency quenching process, plays a crucial role in determining the ultimate performance of the drive shaft. Through medium-frequency quenching, the drive shaft surface achieves high hardness, excellent wear resistance, and good fatigue strength, while the core maintains excellent toughness and comprehensive mechanical properties, thus meeting the stringent requirements for stable and reliable operation under various complex operating conditions. However, the cooling devices used in traditional medium-frequency quenching have many drawbacks.

[0003] First, cooling uniformity is difficult to ensure effectively. During the quenching and cooling process of the drive shaft, due to the design defects of the traditional cooling structure, the cooling medium cannot be evenly distributed when in contact with the drive shaft. Taking a drive shaft of a certain length as an example, the quenching operation is carried out from bottom to top along the drive shaft, and the coolant will flow downward after spraying. After the bottom of the drive shaft is quenched, it will continue to contact the coolant flowing downward, which makes the cooling time of the lower part of the drive shaft longer and the cooling effect stronger. In contrast, the cooling of the upper part of the drive shaft is weaker, resulting in uneven cooling. This uneven cooling will cause differences in the surface hardness of the drive shaft, causing residual stress concentration problems, greatly increasing the risk of deformation, fracture and other failure conditions of the drive shaft during subsequent use, and have a serious negative impact on product quality and service life.

[0004] Secondly, both water cooling and air cooling have their own drawbacks. When using water cooling, if the water quality is poor, impurities in the water may adversely affect the surface quality of the workpiece, and water stains remaining on the drive shaft can also affect cooling uniformity. On the other hand, when using air cooling, the cooling rate is relatively slow, making it difficult to meet the requirements of certain processes that require high cooling rates. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the present invention provides a quenching device for drive shaft production with a two-stage cooling function. It has the advantages of combining water cooling and air cooling according to the characteristics of the drive shaft, and improving the cooling uniformity while ensuring the cooling rate, thereby solving the problems in the above-mentioned background technology.

[0007] (2) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A quenching device for the production of a transmission shaft with a two-stage cooling function, comprising a vertical displacement mechanism for fixing and moving the transmission shaft, the vertical displacement mechanism, and a quenching induction coil for quenching the transmission shaft, the quenching induction coil, and a two-stage cooling device arranged below the quenching induction coil, the two-stage cooling device comprising at least one set of primary water-cooling rings and secondary air-cooling seats arranged from top to bottom, the primary water-cooling rings being used to spray coolant onto the transmission shaft located at a position slightly above the center of the two-stage cooling device, the secondary air-cooling seat being used to spray coolant onto the transmission shaft located at a position slightly above the center of the two-stage cooling device, and the secondary air-cooling seat being used to spray coolant onto the transmission shaft located at a position slightly above the center of the two-stage cooling device. The transmission shaft at the lower center of the cooling device sprays a cooling air flow, and a coolant discharge structure and an air flow descaling structure are further provided in the two-stage cooling device, the coolant discharge structure is used to guide the downward-flowing coolant sprayed by the primary water-cooling ring to the outside away from the transmission shaft for discharge, the air flow descaling structure is used to blow the air flow sprayed by the secondary air-cooling seat from bottom to top to remove the residual water stains on the two-stage cooling device, the two-stage cooling device is composed of the side wall and the bottom plate, the primary water-cooling ring is detachably mounted on the top of the side wall, and the center of the bottom plate is provided with a vertical hole for passing the transmission shaft;

[0010] The coolant drainage structure includes a coolant guide plate provided in the secondary air cooling seat and a drain port provided at the bottom of the side wall. The coolant guide plate is high in the middle and low around. The bottom of the coolant guide plate is connected to the bottom plate by a support plate.

[0011] The airflow stain removal structure includes an air cavity provided in the bottom plate and gaps between the support plates, and an airflow nozzle inclined upward is provided in the air cavity at the position of the vertical hole;

[0012] The coolant guide plate guides the water flow sprayed from the primary water-cooling ring to the surrounding areas and is discharged from the drain port. The air flow in the air cavity is blown out from the air flow nozzle toward the upper center, and the water stains remaining on the drive shaft are discharged from the gap in the support plate to the surrounding areas, and the water flow is accelerated to be discharged from the drain port under the action of the air flow.

[0013] Preferably, the bottom of the secondary air-cooling seat is detachably connected to another primary water-cooling ring, and the two-stage cooling device is provided with multiple groups of primary water-cooling rings and secondary air-cooling seats arranged in sequence. Through intermittent water cooling and air cooling, the temperature change of the transmission shaft during the quenching process is more uniform.

[0014] Preferably, the bottom surface of the coolant guide plate does not contact the top surface of the bottom plate, the top surface of the bottom plate is a slope with a high middle and a low outside, and an air pipe connecting seat is provided outside the air cavity for connecting an air pump.

[0015] Preferably, the bottom of the first-level water-cooling ring and the top of the side wall are detachably connected by a thread, the side wall connection is sleeved on the outside of the first-level water-cooling ring connection, the inside of the side wall connection is provided with an internal thread, and the outside of the first-level water-cooling ring connection is provided with an external thread that engages with the internal thread of the side wall.

[0016] Preferably, a water pipe connecting seat is provided on the outside of the primary water cooling ring, and the water pipe connecting seat is connected to the liquid cavity inside the primary water cooling ring. A plurality of water flow nozzles connected to the liquid cavity are provided on the inner circumference of the primary water cooling ring.

[0017] Preferably, the induction coil and the quenching induction coil are passed through a medium frequency alternating current. When the workpiece is placed in the medium frequency induction coil, when the coil is passed through a medium frequency alternating current, eddy currents are generated on the surface of the workpiece, and the eddy currents cause the surface of the workpiece to heat up rapidly to reach the quenching temperature.

[0018] Preferably, the vertical displacement mechanism comprises a column, a displacement mounting plate is slidably provided on the column, the upper and lower parts of the displacement mounting plate are respectively provided with a fixed mounting seat, the adjustable mounting seat and the fixed mounting seat, the fixed mounting seat, the fixed mounting seat and the adjustable mounting seat are used to clamp the transmission shaft, and the transmission shaft passes through the quenching induction coil and the two-stage cooling device in sequence when moving downward during quenching;

[0019] The column is provided with a threaded rod, the threaded rod and the screw motor, the screw motor is arranged at the top or bottom of the column, and the output shaft of the screw motor drives the threaded rod to rotate, and the threaded rod is provided with an external thread, and the threaded rod passes through a protrusion fixed on the displacement mounting plate, and the vertical hole of the protrusion for passing through the threaded rod is provided with an internal thread engaged with the threaded rod, and the threaded rod is connected to the displacement mounting plate by a thread, and the threaded rod can drive the displacement mounting plate to rise and fall when the threaded rod is driven to rotate by the screw motor, and the displacement mounting plate is slidably connected to the column by a slot, and the slot prevents the displacement mounting plate from being driven to rotate by the threaded rod.

[0020] Preferably, the fixed mounting seat is fixed on the displacement mounting plate, the adjustable mounting seat is detachably arranged on the displacement mounting plate, the fixed mounting seat and the adjustable mounting seat are slidably connected to the displacement mounting plate, and the fixed mounting seat and the adjustable mounting seat are fixed to the displacement mounting plate at different heights by bolts.

[0021] Preferably, the fixed mounting seat and the adjustable mounting seat are provided with a pressure column, the pressure column and a transmission shaft clamping cylinder, the transmission shaft clamping cylinder pushes the pressure column, the pressure column to rise and fall, and the fixed mounting seat is provided with a top shaft column, the top shaft column and a transmission shaft rotation motor, the transmission shaft rotation motor, the top shaft column is fixed on the output shaft of the transmission shaft rotation motor or is connected to the output shaft of the transmission shaft rotation motor through gear transmission, so that the transmission shaft rotation motor drives the top shaft column, the top shaft column to rotate.

[0022] Preferably, the vertical displacement mechanism is arranged in the quenching machine, a top window is arranged on the top of the quenching machine, the displacement mounting plate passes through the top window, a working window is arranged on the front side of the quenching machine, a safety protection door is slidingly arranged on the working window, a transparent observation window is arranged on the safety protection door, and an intelligent robot is also arranged on the outside of the quenching machine, the mechanical arm of the intelligent robot clamps the transmission shaft from the front conveyor belt and places it in the vertical displacement mechanism for quenching, after quenching is completed, the mechanical arm clamps the transmission shaft and places it on the rear conveyor belt, and the support frame is fixedly connected to the primary water-cooling ring in the quenching machine.

[0023] (3) Beneficial effects

[0024] Compared with the prior art, the present invention provides a quenching device for transmission shaft production with a two-stage cooling function, which has the following beneficial effects:

[0025] 1. The quenching device for drive shaft production with a two-stage cooling function is configured with a primary water-cooling ring and a secondary air-cooling seat in the two-stage cooling device. The coolant discharge structure and the airflow descaling structure in the two-stage cooling device are used to guide the coolant sprayed from the primary water-cooling ring and the cooling airflow sprayed from the secondary air-cooling seat respectively. The airflow descaling structure is used to guide the cooling airflow to spray upward to remove water stains remaining on the drive shaft, thereby solving the problems of residual water stains in water cooling affecting cooling uniformity and impurities in the water stains affecting quenching effect. At the same time, the airflow can also accelerate the discharge speed of the coolant.

[0026] 2. The quenching device for the production of the transmission shaft with a two-stage cooling function has another first-level water-cooling ring 410 detachably connected to the bottom of the second-level air-cooling seat 420. A plurality of groups of first-level water-cooling rings 410 and second-level air-cooling seats 420 are arranged in sequence in the two-stage cooling device 400. Through intermittent water cooling and air cooling, the temperature change of the transmission shaft 200 during the quenching process is made more uniform. The rates of water cooling and air cooling in different groups can also be controlled, thereby performing graded cooling and improving the quenching effect.

[0027] 3. This quenching device for drive shaft production with a two-stage cooling function sets a coolant guide plate in the middle position of the secondary air-cooling seat. The water sprayed by the primary water-cooling ring is guided to the outside through the coolant guide plate in advance for discharge, reducing the pressure of the air flow in the air flow nozzle and making the removal of water stains on the drive shaft surface more thorough.

[0028] 4. The quenching device for the production of transmission shafts with a two-stage cooling function can easily replace the secondary air-cooling seat with vertical holes of different sizes by detachably connecting the secondary air-cooling seat to the bottom of the primary water-cooling ring through threads, thereby adapting to transmission shafts of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of embodiment 1 of the present invention.

[0030] Figure 2 Schematic diagram of the internal structure of the first embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of the structure during quenching according to the first embodiment of the present invention.

[0032] Figure 4 Schematic diagram of the structure of the vertical displacement mechanism of embodiment 1 of the present invention.

[0033] Figure 5This is a schematic structural diagram of a two-stage cooling device according to embodiment 1 of the present invention.

[0034] Figure 6 This is an exploded view of the two-stage cooling device according to the first embodiment of the present invention.

[0035] Figure 7 This is a cross-sectional view of a two-stage cooling device according to embodiment 1 of the present invention.

[0036] Figure 8 This is a schematic diagram of the internal structure of the two-stage cooling device according to the first embodiment of the present invention.

[0037] Figure 9 This is a schematic structural diagram of a two-stage cooling device according to the second embodiment of the present invention.

[0038] In the figure: 100, vertical displacement mechanism; 110, column; 120, displacement mounting plate; 130, threaded rod; 140, screw motor; 150, fixed mounting seat; 160, adjustable mounting seat; 161, shaft pressing column; 162, transmission shaft clamping cylinder; 151, shaft pushing column; 152, transmission shaft rotation motor; 200, transmission shaft; 300, quenching induction coil; 400, two-stage cooling device; 410, first-stage water cooling ring; 4 20. Secondary air cooling seat; 430. Support frame; 411. Water pipe connection seat; 412. Water flow nozzle; 413. Liquid cavity; 421. Side wall; 4211. Drain outlet; 422. Bottom plate; 423. Coolant guide plate; 424. Support plate; 425. Air cavity; 426. Air flow nozzle; 427. Air pipe connection seat; 428. Vertical hole; 500. Quenching machine tool; 510. Top window; 520. Working window; 530. Safety protection door. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being referred to. Thus, features specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0042] Example 1:

[0043] This embodiment provides a quenching device for transmission shaft production with a two-stage cooling function, which has the following technical features.

[0044] See also Figure 1-8 A quenching device for transmission shaft production with a two-stage cooling function includes a vertical displacement mechanism 100 for fixing and moving a transmission shaft 200 and a quenching induction coil 300 for quenching the transmission shaft 200, and also includes a two-stage cooling device 400 arranged below the quenching induction coil 300. The two-stage cooling device 400 includes at least one set of primary water-cooling rings 410 and secondary air-cooling seats 420 arranged from top to bottom. The primary water-cooling ring 410 is used to spray coolant onto the transmission shaft 200 located at a position slightly above the center of the two-stage cooling device 400, and the secondary air-cooling seat 420 is used to spray coolant onto the transmission shaft 200 located at a position slightly below the center of the two-stage cooling device 400. The transmission shaft 200 is provided with a cooling airflow, and a coolant drainage structure and an airflow destaining structure are further provided in the two-stage cooling device 400. The coolant drainage structure is used to guide the downward coolant sprayed by the first-stage water-cooling ring 410 to the outside away from the transmission shaft 200 for discharge, and the airflow destaining structure is used to blow the airflow sprayed by the second-stage air-cooling seat 420 from bottom to top to remove the residual water stains on the two-stage cooling device 400. The second-stage air-cooling seat 420 is composed of a side wall 421 and a bottom plate 422. The first-stage water-cooling ring 410 is detachably mounted on the top of the side wall 421. A vertical hole 428 for passing the transmission shaft 200 is provided at the center of the bottom plate 422.

[0045] The coolant drainage structure includes a coolant guide plate 423 provided in the secondary air cooling seat 420 and a drain port 4211 provided at the bottom of the side wall 421. The coolant guide plate 423 is high in the middle and low around. The bottom of the coolant guide plate 423 is connected to the bottom plate 422 via a support plate 424.

[0046] The airflow stain removal structure includes an air cavity 425 provided in the bottom plate 422 and gaps between the support plates 424. The air cavity 425 is provided with an upwardly tilted airflow nozzle 426 at the position of the vertical hole 428.

[0047] The coolant guide plate 423 guides the water flow sprayed from the first-level water-cooling ring 410 to the surrounding areas and discharges it from the drain port 4211. The air flow in the air cavity 425 is blown out from the air flow nozzle 426 toward the center and above, and the water stains remaining on the drive shaft 200 are discharged to the surrounding areas through the gap in the support plate 424. Under the action of the air flow, the water flow is accelerated to be discharged from the drain port 4211.

[0048] It should be noted that the side of the air cavity 425 close to the vertical hole 428 is higher than the outer part, and the side of the air cavity 425 close to the vertical hole 428 is narrower than the outer part. The air pipe connecting seat 427 is arranged on the side of the secondary air cooling seat 420 and is connected to the air cavity 425.

[0049] In an optional embodiment, the bottom surface of the coolant guide plate 423 does not contact the top surface of the bottom plate 422. The top surface of the bottom plate 422 is a slope that is high in the middle and low on the outside. An air pipe connecting seat 427 is provided outside the air cavity 425 for connecting to an air pump.

[0050] In an optional embodiment, the bottom of the first-level water-cooling ring 410 and the top of the side wall 421 are detachably connected by threads, the connection of the side wall 421 is sleeved on the outside of the connection of the first-level water-cooling ring 410, the inner side of the connection of the side wall 421 is provided with an internal thread, and the outer side of the connection of the first-level water-cooling ring 410 is provided with an external thread that engages with the internal thread of the side wall 421.

[0051] In an optional embodiment, a water pipe connection seat 411 is provided on the outside of the first-level water-cooling ring 410, and the water pipe connection seat 411 is connected to the liquid cavity 413 inside the first-level water-cooling ring 410. A plurality of water nozzles 412 connected to the liquid cavity 413 are provided on the inner circumference of the first-level water-cooling ring 410.

[0052] In an optional embodiment, a medium-frequency alternating current is passed through the induction coil 300 for induction quenching. When the workpiece is placed in the medium-frequency induction coil, eddy currents are generated on the surface of the workpiece when the medium-frequency alternating current is passed through the coil. The eddy currents cause the surface of the workpiece to heat up rapidly to reach the quenching temperature.

[0053] In an optional embodiment, the vertical displacement mechanism 100 includes a column 110, on which a displacement mounting plate 120 is slidably mounted. A fixed mounting seat, an adjustable mounting seat 160, and a fixed mounting seat 150 are respectively disposed at the upper and lower portions of the displacement mounting plate 120. A drive shaft 200 is clamped between the fixed mounting seat 150 and the fixed mounting seat, the adjustable mounting seat 160. During quenching, the drive shaft 200 moves downward and sequentially passes through the quenching induction coil 300 and the two-stage cooling device 400.

[0054] A threaded rod 130 and a screw motor 140 are provided in the column 110. The screw motor 140 is provided at the top or bottom of the column 110. The output shaft of the screw motor 140 drives the threaded rod 130 to rotate. The threaded rod 130 is provided with an external thread. The threaded rod 130 passes through a protrusion fixed on the displacement mounting plate 120. The vertical hole on the protrusion for passing the threaded rod 130 is provided with an internal thread that engages with the threaded rod 130. The threaded rod 130 is connected to the displacement mounting plate 120 by a thread. When the threaded rod 130 is driven to rotate by the screw motor 140, it can drive the displacement mounting plate 120 to rise and fall. The displacement mounting plate 120 and the column 110 are slidably connected by a slot. The slot prevents the displacement mounting plate 120 from being driven to rotate by the threaded rod 130.

[0055] In an optional embodiment, the fixed mounting seat 150 is fixed on the displacement mounting plate 120, the fixed mounting seat adjustable mounting seat 160 is detachably set on the displacement mounting plate 120, the fixed mounting seat adjustable mounting seat 160 is slidingly connected to the displacement mounting plate 120, and the fixed mounting seat adjustable mounting seat 160 is fixed to the displacement mounting plate 120 at different heights by bolts.

[0056] In an optional embodiment, a fixed mounting seat or an adjustable mounting seat 160 is provided with a pressure shaft column 161 and a transmission shaft clamping cylinder 162, and the transmission shaft clamping cylinder 162 pushes the pressure shaft column 161 up and down, and a top shaft column 151 and a transmission shaft rotation motor 152 are provided on the fixed mounting seat 150, and the top shaft column 151 is fixed on the output shaft of the transmission shaft rotation motor 152 or is connected to the output shaft of the transmission shaft rotation motor 152 through gear transmission, so that the transmission shaft rotation motor 152 drives the top shaft column 151 to rotate.

[0057] In an optional embodiment, the vertical displacement mechanism 100 is arranged in the quenching machine 500, and a top window 510 is provided on the top of the quenching machine 500. The displacement mounting plate 120 passes through the top window 510. A working window 520 is provided on the front side of the quenching machine 500. A safety protection door 530 is slidingly provided on the working window 520, and a transparent observation window is provided on the safety protection door 530. An intelligent robot is also provided on the outside of the quenching machine 500. The robotic arm of the intelligent robot clamps the drive shaft from the front conveyor belt and places it in the vertical displacement mechanism 100 for quenching. After quenching is completed, the robotic arm clamps the drive shaft and places it on the rear conveyor belt. The first-level water-cooling ring 410 is fixedly connected in the quenching machine 500 by setting a support frame 430.

[0058] Example 2:

[0059] This embodiment provides a quenching device for transmission shaft production with a two-stage cooling function, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0060] See also Figure 9 The bottom of the secondary air-cooling seat 420 can be detachably connected to another primary water-cooling ring 410. The two-stage cooling device 400 is provided with multiple groups of primary water-cooling rings 410 and secondary air-cooling seats 420 arranged in sequence. Through intermittent water cooling and air cooling, the temperature change of the transmission shaft 200 during the quenching process is more uniform.

[0061] It should be noted that the primary water-cooling ring 410 and the secondary air-cooling seat 420 are connected and fixed by detachable connection methods such as threads, snaps, pins or bolts.

[0062] Working principle: First, lift the displacement mounting plate 120 to Figure 2 The top shaft column 151 shown is higher than the position of the quenching induction coil 300. The bottom of the drive shaft 200 is fixed on the top shaft column 151. The drive shaft clamping oil cylinder 162 is then used to control the pressure column 161 to descend and press on the top of the drive shaft 200, thereby fixing the drive shaft 200 at the upper and lower ends respectively. Then, the drive shaft rotation motor 152 is started to drive the drive shaft 200 to rotate. The drive shaft 200 is heated by the quenching induction coil 300, and then the displacement mounting plate 120 is slowly lowered to allow the drive shaft 200 to pass through the quenching induction coil 300 and the two-stage cooling device 400 in sequence, and pass through the quenching. Part of the induction coil 300 is heated to a specified temperature, and the part entering the two-stage cooling device 400 is first cooled for the first time by the water flow sprayed inward by the water nozzle 412. The part of the water flow sprayed on the drive shaft 200 falls on the coolant guide plate 423, flows outward along the inclined surface of the coolant guide plate 423, and falls to the outside of the bottom plate 422, and is discharged from the side through the drain port 4211. The residual water flow attached to the surface of the drive shaft 200 is blown to the side and upward by the air flow blown by the air flow nozzle 426 when flowing downward, and falls on the bottom plate 422, and is discharged outward along the bottom plate 422.

[0063] To sum up, the quenching device for drive shaft production with a two-stage cooling function, by arranging a first-stage water-cooling ring 410 and a second-stage air-cooling seat 420 in the two-stage cooling device 400, uses the coolant discharge structure and the airflow descaling structure in the two-stage cooling device 400 to guide the coolant sprayed from the first-stage water-cooling ring 410 and the cooling airflow sprayed from the second-stage air-cooling seat 420 respectively, and uses the airflow descaling structure to guide the cooling airflow to spray upward to remove the water stains remaining on the drive shaft 200, thereby solving the problem that water cooling easily causes residual water stains, which affects the cooling uniformity, and the impurities in the water stains affect the quenching effect. At the same time, the airflow can also speed up the discharge of the coolant.

[0064] The quenching device for transmission shaft production with a two-stage cooling function has another first-stage water-cooling ring 410 detachably connected to the bottom of the second-stage air-cooling seat 420. A plurality of groups of first-stage water-cooling rings 410 and second-stage air-cooling seats 420 are arranged in sequence in the two-stage cooling device 400. Through intermittent water cooling and air cooling, the temperature change of the transmission shaft 200 during the quenching process is made more uniform. The rates of water cooling and air cooling in different groups can also be controlled, thereby performing graded cooling and improving the quenching effect.

[0065] The quenching device for transmission shaft production with a two-stage cooling function sets a coolant guide plate 423 at the middle position in the secondary air-cooling seat 420. The splashing water sprayed by the primary water-cooling ring 410 is guided to the outside through the coolant guide plate 423 in advance for discharge, thereby reducing the pressure of the airflow in the airflow nozzle 426 and making the removal of water stains on the surface of the transmission shaft 200 more thorough.

[0066] The quenching device for transmission shaft production with a two-stage cooling function can easily replace the secondary air-cooling seat 420 with vertical holes 428 of different sizes by detachably connecting the secondary air-cooling seat 420 to the bottom of the primary water-cooling ring 410 through threads, thereby adapting to transmission shafts 200 of different sizes.

[0067] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0068] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A quenching device for producing a transmission shaft with a dual-stage cooling function, comprising a vertical displacement mechanism (100) for fixing and moving the transmission shaft (200) and a quenching induction coil (300) for quenching the transmission shaft (200), characterized in that: The invention also includes a two-stage cooling device (400) arranged below the quenching induction coil (300), wherein the two-stage cooling device (400) includes at least one set of a primary water-cooling ring (410) and a secondary air-cooling seat (420) arranged from top to bottom, wherein the primary water-cooling ring (410) is used to spray coolant onto the transmission shaft (200) located at a position slightly above the center of the two-stage cooling device (400), and the secondary air-cooling seat (420) is used to spray cooling airflow onto the transmission shaft (200) located at a position slightly below the center of the two-stage cooling device (400). The two-stage cooling device (400) is also provided with a coolant discharge structure and an air flow control system. A flow stain removal structure, wherein the coolant discharge structure is used to guide the coolant sprayed downward from the primary water-cooling ring (410) to a position away from the transmission shaft (200) for discharge, and the air flow stain removal structure is used to blow the air flow sprayed from the secondary air-cooling seat (420) from bottom to top to remove the water stains remaining on the two-stage cooling device (400), wherein the secondary air-cooling seat (420) is composed of a side wall (421) and a bottom plate (422), the primary water-cooling ring (410) is detachably mounted on the top of the side wall (421), and a vertical hole (428) for passing the transmission shaft (200) is provided at the center of the bottom plate (422); The coolant drainage structure comprises a coolant guide plate (423) arranged in the secondary air cooling seat (420) and a drain port (4211) arranged at the bottom of the side wall (421); the coolant guide plate (423) is higher in the middle and lower around, and the bottom of the coolant guide plate (423) is connected to the bottom plate (422) by providing a support plate (424); The airflow stain removal structure comprises an air cavity (425) provided in the bottom plate (422) and gaps between the support plates (424); the air cavity (425) is provided with an airflow nozzle (426) tilted upward at the position of the vertical hole (428).

2. The quenching device for transmission shaft production with a dual-stage cooling function according to claim 1, characterized in that: Another primary water cooling ring (410) is detachably connected to the bottom of the secondary air cooling seat (420). The two-stage cooling device (400) is provided with a plurality of groups of primary water cooling rings (410) and secondary air cooling seats (420) arranged in sequence. Through intermittent water cooling and air cooling, the temperature change of the transmission shaft (200) during the quenching process is made more uniform.

3. The quenching device for transmission shaft production with a dual-stage cooling function according to claim 2, characterized in that: The bottom surface of the coolant guide plate (423) does not contact the top surface of the bottom plate (422). The top surface of the bottom plate (422) is a sloped surface with a high center and a low outside. An air pipe connecting seat (427) is provided outside the air cavity (425) for connecting to an air pump.

4. The quenching device for transmission shaft production with a dual-stage cooling function according to claim 3, characterized in that: The bottom of the first-level water-cooling ring (410) and the top of the side wall (421) are detachably connected via a thread, the side wall (421) connection is sleeved on the outside of the first-level water-cooling ring (410) connection, the inside of the side wall (421) connection is provided with an internal thread, and the outside of the first-level water-cooling ring (410) connection is provided with an external thread that engages with the internal thread of the side wall (421).

5. The quenching device for transmission shaft production with a dual-stage cooling function according to claim 4, characterized in that: A water pipe connection seat (411) is provided on the outside of the primary water cooling ring (410), and the water pipe connection seat (411) is connected to the liquid cavity (413) inside the primary water cooling ring (410). A plurality of water flow nozzles (412) connected to the liquid cavity (413) are provided on the inner circumference of the primary water cooling ring (410).

6. The quenching device for transmission shaft production with a dual-stage cooling function according to claim 5, characterized in that: The induction coil (300) is passed through a medium frequency alternating current. When a workpiece is placed in the medium frequency induction coil, eddy currents are generated on the surface of the workpiece when the medium frequency alternating current is passed through the coil. The eddy currents cause the surface of the workpiece to heat up rapidly to reach a quenching temperature.

7. The quenching device for transmission shaft production with a dual-stage cooling function according to claim 6, characterized in that: The vertical displacement mechanism (100) includes a column (110), a displacement mounting plate (120) is slidably provided on the column (110), a fixed mounting seat (160) and a fixed mounting seat (150) are provided on the upper and lower parts of the displacement mounting plate (120), and a drive shaft (200) is clamped between the fixed mounting seat (150) and the fixed mounting seat (160). When the drive shaft (200) moves downward during quenching, it passes through the quenching induction coil (300) and the two-stage cooling device (400) in sequence. A threaded rod (130) and a screw motor (140) are provided in the column (110). The screw motor (140) is provided at the top or bottom of the column (110). The output shaft of the screw motor (140) drives the threaded rod (130) to rotate. The threaded rod (130) is provided with an external thread. The threaded rod (130) passes through a protrusion fixed on the displacement mounting plate (120). The vertical hole of the protrusion for passing the threaded rod (130) is provided with an internal thread engaged with the threaded rod (130). The threaded rod (130) is connected to the displacement mounting plate (120) by a thread. When the threaded rod (130) is driven to rotate by the screw motor (140), it can drive the displacement mounting plate (120) to rise and fall. The displacement mounting plate (120) and the column (110) are connected in a sliding manner by a card slot. The card slot prevents the displacement mounting plate (120) from being driven to rotate by the threaded rod (130).

8. The quenching device for transmission shaft production with a dual-stage cooling function according to claim 7, characterized in that: The fixed mounting seat (150) is fixed on the displacement mounting plate (120), the fixed mounting seat (160) is detachably arranged on the displacement mounting plate (120), the fixed mounting seat (160) is slidably connected to the displacement mounting plate (120), and the fixed mounting seat (160) is fixed to the displacement mounting plate (120) at different heights by bolts.

9. The quenching device for transmission shaft production with a dual-stage cooling function according to claim 8, characterized in that: The fixed mounting seat (160) is provided with a pressure column (161) and a transmission shaft clamping oil cylinder (162), and the transmission shaft clamping oil cylinder (162) pushes the pressure column (161) to rise and fall. The fixed mounting seat (150) is provided with a top shaft column (151) and a transmission shaft rotating motor (152), and the top shaft column (151) is fixed on the output shaft of the transmission shaft rotating motor (152) or is connected to the output shaft of the transmission shaft rotating motor (152) through gear transmission, so that the transmission shaft rotating motor (152) drives the top shaft column (151) to rotate.

10. The quenching device for transmission shaft production with a dual-stage cooling function according to claim 9, characterized in that: The vertical displacement mechanism (100) is arranged in the quenching machine (500), the top of the quenching machine (500) is provided with a top window (510), the displacement mounting plate (120) passes through the top window (510), the front side of the quenching machine (500) is provided with a working window (520), the working window (520) is provided with a safety protection door (530) which is slidably provided, and the safety protection door (530) is provided with a transparent observation window. An intelligent robot is also provided outside the quenching machine (500), the mechanical arm of the intelligent robot clamps the transmission shaft from the front conveyor belt and places it in the vertical displacement mechanism (100) for quenching. After quenching is completed, the mechanical arm clamps the transmission shaft and places it on the rear conveyor belt. The quenching machine (500) is fixedly connected to the primary water cooling ring (410) by providing a support frame (430).

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