Cooling device for heat treatment of spheroidal graphite cast iron gearboxes

Abstract

The present application relates to a kind of cooling device of nodular cast iron gear box heat treatment, including cooling tank and the tank cover that is sealed with the cooling tank top opening cover;The main liquid inlet pipe is in the cooling tank, and the tank cover top surface has discharge pipe, and the discharge pipe and main liquid inlet pipe are communicated by the sealed cavity formed by tank cover and cooling tank;The inner container with hollow structure is embedded in the cooling tank, and the cooling tank has exhaust assembly, and quenching workpiece is located in the middle of inner container inside, and is in the state of tumbling.The present application changes the state of gear box under quenching state, and the exhaust assembly is used to make the gear box suspended in the inner container by the quenching medium sprayed on the gear box in the inner container, and continuously overturns, so that the residual air in the gear box is quickly discharged, so that the inner wall of the gear box can be in time with quenching medium fully contacted, and then balanced cooling is realized, to avoid local cooling too slowly, cause internal crack or local deformation occurs.

Description

Technical Field

[0001] This invention relates to the field of heat treatment equipment technology, and more particularly to a cooling device for heat treatment of ductile iron gearboxes. Background Technology

[0002] Ductile iron is a high-strength and high-toughness cast iron material, widely used in mechanical equipment such as gearboxes due to its good machinability and corrosion resistance. Heat treatment is a crucial process in the manufacture of ductile iron gearboxes. Its purpose is to control the heat treatment process to achieve the desired properties and characteristics, thus reaching the expected service life and mechanical performance.

[0003] Annealing does not require rapid cooling, but quenching, which follows annealing, enhances the hardness, toughness, and wear resistance of cast iron. This process requires rapidly cooling the material to below room temperature to form a finer martensitic structure, resulting in higher hardness and strength for ductile iron. Common quenching media include brine, water, mineral oil, and air.

[0004] In comparison, the quenching process of ductile iron gearboxes is relatively complex, mainly due to the complex internal structure of the gearbox. When the gearbox is immersed in the quenching medium, its complex internal structure easily leads to residual air, forming air chambers inside the gearbox. This causes inconsistent temperature changes between the inner wall and other parts of the chamber. Over time, these inconsistent temperature changes can lead to internal cracks or localized deformation. Although subsequent tempering and annealing processes can eliminate the thermal stress and retained austenite caused by quenching, they generally increase the complexity of subsequent gearbox production. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a cooling device for the heat treatment of ductile iron gearboxes. The specific technical solution is as follows:

[0006] A cooling device for heat treatment of ductile iron gearboxes, comprising:

[0007] A cooling box and a lid that seals shut with the top opening of the cooling box;

[0008] The cooling tank has a main liquid inlet pipe, and the top surface of the tank cover has a discharge pipe. The discharge pipe and the main liquid inlet pipe are connected through a sealed cavity formed by the tank cover and the cooling tank.

[0009] The cooling box has an inner liner with a hollow structure, and the cooling box has an exhaust assembly that keeps the quenched workpiece in the middle of the inner side of the liner and in a tumbling state.

[0010] Traditional quenching processes involve placing a high-temperature gearbox into a cooling chamber, immersing it in a quenching medium, and then cooling the gearbox. Due to its internal structure, the stationary gearbox cannot easily expel the air inside. As a result, the remaining air accumulates inside the gearbox after immersion in the quenching medium, forming an air chamber. This prevents the gearbox wall in that part from directly contacting the quenching medium, leading to slow localized cooling and the formation of internal cracks or localized deformation.

[0011] This solution alters the gearbox's state during quenching, allowing air to escape while ensuring thorough quenching. Specifically, the main inlet pipe continuously supplies quenching medium into the cooling tank. Once the tank is full, the supply stops, enabling the gearbox to undergo quenching. The high-temperature gearbox is placed into the cooling tank, and the lid is immediately closed. The main inlet pipe then continuously supplies quenching medium until quenching is complete. The closed lid creates a sealed cavity, allowing the heat-absorbing quenching medium to drain through the outlet pipe, thus achieving fluid cooling.

[0012] Meanwhile, the quenching medium continuously fed in by the main inlet pipe is sprayed out through the exhaust assembly, and the sprayed quenching medium acts on the gearbox located inside the inner liner, causing the gearbox to suspend inside the inner liner and continuously rotate, so as to quickly expel the residual air inside the gearbox, so that the inner wall of the gearbox can come into full contact with the quenching medium in a timely manner, thereby achieving uniform cooling.

[0013] As an improvement to the above technical solution, the inner liner is a barrel-shaped structure with an open top, and overflow ports are evenly distributed along the edge of the opening where the inner liner fits with the inner wall of the cooling box.

[0014] The inner liner has evenly distributed upper grooves on its sidewall;

[0015] A through hole is provided in the middle of the bottom surface of the inner liner, and a lower groove with an arc structure is provided in a ring around the through hole;

[0016] The bottom of the inner liner has a support plate that is fixedly connected to the inner wall of the cooling box, and the support plate has overflow ports evenly distributed on it.

[0017] The inner liner is designed to prevent the gearbox from contacting the inner wall of the cooling box during rotation, thus protecting the inner wall of the cooling box from damage. Preferably, the inner liner is made of hard rubber.

[0018] Meanwhile, the support plate is used to fix the inner liner to the cooling box, preventing the inner liner from shifting within the cooling box and thus affecting the path of the ejected quenching medium. The upper and lower overflow ports are used to ensure that the quenching medium can also pass smoothly between the inner liner and the cooling box, without accumulating high-temperature quenching medium that absorbs heat, which would affect the linearity of cooling.

[0019] The upper slot, through hole, and lower slot are designed to allow the sprayed cooling medium to enter the inner liner and act on the gearbox, causing it to suspend and continuously rotate. Furthermore, the upper slot, through hole, and lower slot also prevent the rotating gears from damaging the exhaust assembly.

[0020] As an improvement to the above technical solution, the exhaust assembly includes:

[0021] Maintaining components and tumbling components;

[0022] The holding component is used to suspend the quenched workpiece in the middle of the inner liner;

[0023] The tumbling assembly is used to provide driving force for the continuous tumbling of the quenched workpiece.

[0024] The exhaust assembly comprises two parts: a maintaining assembly for suspending the gearbox in the center of the inner liner, and a tumbling assembly for providing driving force for the continuous tumbling of the gearbox. By controlling the tumbling and suspending of the gearbox separately by two components, precise control of gearboxes of different sizes is possible.

[0025] As an improvement to the above technical solution, the maintaining component includes:

[0026] The maintenance nozzles are all located on the inner wall of the cooling box. Multiple maintenance nozzles arranged longitudinally form a group, and multiple groups are evenly distributed in a ring along the inner wall of the cooling box.

[0027] The liquid inlet end of each of the sustaining nozzles is connected to an annular diversion groove on the inner wall of the cooling tank, and the liquid outlet end of each of the sustaining nozzles in the same group corresponds to the position of the upper groove opening, so as to send the sprayed quenching medium into the inner liner.

[0028] The nozzles are positioned on the inner wall of the cooling box, and the sprayed quenching medium acts on the gearbox through the upper slot, ensuring that the suspended gearbox maintains a distance from the inner wall of the inner liner, thus preventing it from colliding with the inner liner and the inner wall of the cooling box.

[0029] The annular diversion groove is designed to uniformly deliver the quenching medium to the maintenance nozzles, ensuring that the force exerted on the gearbox by the quenching medium ejected from each maintenance nozzle, or even each group of maintenance nozzles, is approximately the same, so that the gearbox is always inside the inner liner.

[0030] As an improvement to the above technical solution, the maintaining component further includes:

[0031] The push nozzle is vertically arranged on the bottom surface of the cooling box and sends the sprayed quenching medium into the inner liner through the through hole.

[0032] In addition, in order to precisely control the height of the gearbox suspended inside the inner liner, a push nozzle is vertically arranged on the inner bottom surface of the cooling box. The quenching medium sprayed by the push nozzle acts on the bottom of the gearbox, applying an upward force to the gearbox. Combined with the force applied to the gearbox by the quenching medium sprayed by the holding nozzle, the gearbox is stably suspended in the quenching medium inside the inner liner.

[0033] As an improvement to the above technical solution, the tumbling assembly includes:

[0034] The rotating nozzle is disposed on the bottom surface of the cooling box and is distributed in a ring around the through hole. The rotating nozzle is tilted and the sprayed quenching medium passes through the corresponding lower slot and converges in the middle of the inner liner.

[0035] The quenching medium ejected by the tilting nozzles applies a centrifugal force to the gearbox, causing it to tilt while suspended. Therefore, the tilting nozzles are tilted to eject the quenching medium, breaking the gearbox's suspension and causing it to tilt. To better control the gearbox's tilting speed and attitude, multiple tilting nozzles are used, arranged in a ring around the through-hole, which facilitates uniform adjustment of the nozzles' tilt angle.

[0036] As an improvement to the above technical solution, the tilt angle of the flip nozzle is adjustable.

[0037] Because of the differences in the size, weight, and structural parameters of the gearbox, the different differences will cause the quenching medium sprayed from the flip nozzle to act on the gearbox at different speeds and with different postures. Therefore, by adjusting the tilt angle of the flip nozzle, the force of the sprayed quenching medium acting on the gearbox can be changed, thereby achieving controllable speed and posture of gearbox flipping and thus achieving efficient exhaust of residual air.

[0038] As an improvement to the above technical solution, one side of the box cover is connected to the cooling box, and the other side is connected to the cooling box through a fixed lock to open or close. The box cover has a handle on the circumferential side wall corresponding to the fixed lock to assist in opening or closing the box cover.

[0039] When the lid is hinged to the cooling box, the handle allows for easier and more convenient opening and closing of the lid. The locking mechanism ensures the lid remains closed when the cooling box is in contact with the lid, preventing it from being forced open by the quenching medium.

[0040] As an improvement to the above technical solution, the bottom surface of the tank cover has a protective filter cover, and the liquid inlet end of the discharge pipe extends into the protective filter cover;

[0041] When the box cover is closed with the cooling box cover, the protective filter cover extends into the upper opening of the inner liner.

[0042] On the one hand, it prevents the overturned gearbox from damaging the bottom surface of the tank cover, causing leakage; on the other hand, it protects the discharge pipe extending into the cooling tank, preventing it from being impacted by the overturned gearbox and from affecting the overturning of the gearbox. Preferably, the protective filter cover is made of hard rubber.

[0043] As an improvement to the above technical solution, the main liquid inlet pipe includes an upper liquid inlet branch pipe and a lower liquid inlet branch pipe. The upper liquid inlet branch pipe is used to supply material to the holding component, and the lower liquid inlet branch pipe is used to supply material to the tumbling component.

[0044] The main inlet pipe is split into upper and lower inlet branches to supply quenching media to the holding assembly and the tumbling assembly respectively, thereby enabling the control of different levitation forces, tumbling speeds and attitudes.

[0045] The beneficial effects of this invention are:

[0046] 1. By changing the state of the gearbox under quenching conditions, the exhaust assembly applies the sprayed quenching medium to the gearbox located inside the inner liner, causing the gearbox to suspend inside the inner liner and continuously rotate, so as to quickly expel the residual air inside the gearbox, allowing the inner wall of the gearbox to come into full contact with the quenching medium in a timely manner, thereby achieving uniform cooling and avoiding slow local cooling, which could lead to internal cracks or local deformation.

[0047] 2. The sealed cavity formed by the cover and cooling chamber ensures linear quenching through continuous flow of the quenching medium. The adjustability of the exhaust assembly makes the device suitable for quenching gearboxes of various sizes and shapes. Furthermore, the pressurization of the sealed cavity helps to accelerate the removal of residual air. Attached Figure Description

[0048] Figure 1 This is a perspective view of the overall structure of the present invention;

[0049] Figure 2 This is a top view of the overall structure of the present invention;

[0050] Figure 3 for Figure 2 Sectional view at point AA;

[0051] Figure 4 This is a side view of the overall structure of the present invention;

[0052] Figure 5 for Figure 4 Sectional view at point BB;

[0053] Figure 6 for Figure 4 Sectional view at point CC.

[0054] Reference numerals: 100, Cooling tank; 110, Main inlet pipe; 111, Upper inlet branch pipe; 112, Lower inlet branch pipe; 200, Tank cover; 210, Discharge pipe; 220, Locking device; 230, Handle; 240, Protective filter cover; 300, Inner tank; 310, Upper overflow port; 320, Upper slot opening; 330, Through hole; 340, Lower slot opening; 350, Support plate; 360, Lower overflow port; 400, Exhaust assembly; 410, Holding assembly; 411, Holding nozzle; 412, Annular diverter groove; 413, Push nozzle; 420, Tilting assembly; 421, Tilting nozzle. Detailed Implementation

[0055] 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.

[0056] See Figures 1-6 As shown, Figure 1 This is a perspective view of the overall structure of the present invention; Figure 2 This is a top view of the overall structure of the present invention; Figure 3 for Figure 2 Sectional view at point AA; Figure 4 This is a side view of the overall structure of the present invention; Figure 5 for Figure 4 Sectional view at point BB; Figure 6 for Figure 4 Sectional view at point CC.

[0057] The traditional quenching process involves placing a gearbox at a high temperature into the cooling chamber 100, immersing the gearbox in a quenching medium, and cooling the gearbox. Due to its internal structure, the stationary gearbox is difficult to vent the air inside. As a result, the remaining air accumulates inside the gearbox after immersion in the quenching medium, forming an air chamber. This prevents the gearbox wall in this part from directly contacting the quenching medium, leading to slow local cooling and the formation of internal cracks or local deformation.

[0058] To solve the above technical problems, a cooling device for heat treatment of ductile iron gearboxes is proposed, comprising:

[0059] Cooling box 100 and box cover 200 that seals and closes to the top opening of cooling box 100;

[0060] The cooling tank 100 has a main liquid inlet pipe 110, and the top surface of the tank cover 200 has a discharge pipe 210. The discharge pipe 210 and the main liquid inlet pipe 110 are connected through a sealed cavity formed by the tank cover 200 and the cooling tank 100.

[0061] The cooling box 100 has an inner liner 300 with a hollow structure embedded inside. The cooling box 100 has an exhaust assembly 400 that keeps the quenched workpiece located in the middle of the inner side of the inner liner 300 and in a tumbling state.

[0062] By changing the state of the gearbox during quenching, air is expelled while ensuring sufficient quenching. Specifically, the main inlet pipe 110 continuously supplies quenching medium into the cooling tank 100. Once the cooling tank 100 is full, the supply of quenching medium is stopped, and the gearbox can then be used for quenching. The gearbox at high temperature is placed into the cooling tank 100, and the tank cover 200 is immediately closed. At this time, the main inlet pipe 110 continues to supply quenching medium until the quenching process is complete. Because the tank cover 200 is closed, the cooling tank 100 and the tank cover 200 form a sealed cavity. In this state, the quenching medium that has absorbed heat can only be discharged through the discharge pipe 210, thereby achieving flow cooling of the quenching medium.

[0063] At the same time, the quenching medium continuously fed in by the main liquid inlet pipe 110 is sprayed out through the exhaust assembly 400, and the sprayed quenching medium acts on the gearbox located inside the inner liner 300, so that the gearbox is suspended inside the inner liner 300 and continuously rotates, so as to quickly expel the residual air in the gearbox, so that the inner wall of the gearbox can come into full contact with the quenching medium in a timely manner, thereby achieving uniform cooling.

[0064] See Figure 3 In one embodiment, in order to further efficiently and quickly discharge residual air from inside the gearbox, a pressure relief valve a is provided on the discharge pipe 210. The pressure of the quenching medium is set by the pressure relief valve a, thereby increasing the pressure inside the cooling box 100. By increasing the hydraulic pressure, the discharge efficiency of residual air is improved.

[0065] In addition, a support leg b is provided at the bottom of the cooling tank 100 to elevate the cooling tank 100 so as to facilitate the connection and arrangement of the main liquid inlet pipe 110.

[0066] See Figure 3 , Figure 5 and Figure 6In one embodiment, the inner liner 300 is a barrel-shaped structure with an open top, and overflow ports 310 are evenly distributed along the opening edge where the inner liner 300 fits with the inner wall of the cooling box 100.

[0067] The inner liner 300 has evenly distributed upper grooves 320 on its side wall;

[0068] A through hole 330 is provided in the middle of the bottom surface of the inner liner 300, and a lower groove 340 with an arc structure is provided in a ring around the through hole 330;

[0069] The bottom of the inner liner 300 has a support plate 350 that is fixedly connected to the inner wall of the cooling box 100, and the support plate 350 has overflow ports 360 evenly distributed on it.

[0070] The inner liner 300 is designed to prevent the gearbox from contacting the inner wall of the cooling box 100 during the gearbox's rotation, thus protecting the inner wall of the cooling box 100 from damage. Preferably, the inner liner 300 is made of hard rubber. When the cast iron gearbox collides with the inner liner 300, the inner liner 300 will not be damaged, and the hard rubber will not cause damage to the cast iron gearbox, while also maintaining its own stable shape.

[0071] Meanwhile, the support plate 350 is used to fix the inner liner 300 to the cooling box 100, preventing the inner liner 300 from shifting within the cooling box 100 and thus affecting the path of the ejected quenching medium. The upper overflow port 310 and the lower overflow port 360 are used to ensure that the quenching medium can also pass smoothly between the inner liner 300 and the cooling box 100, so as not to accumulate high-temperature quenching medium that absorbs heat, thus affecting the linearity of cooling.

[0072] The upper slot 320, through hole 330, and lower slot 340 are used for the sprayed cooling medium to enter the inner liner 300 and act on the gearbox, causing it to suspend and continuously rotate. In addition, the upper slot 320, through hole 330, and lower slot 340 also prevent the rotating gear from damaging the exhaust assembly 400.

[0073] See also Figure 3 In one embodiment, the exhaust assembly 400 includes:

[0074] Maintaining component 410 and tumbling component 420;

[0075] Among them, the holding component 410 is used to suspend the quenched workpiece in the middle of the inner liner 300;

[0076] The tumbling assembly 420 is used to provide driving force for the continuous tumbling of the quenched workpiece.

[0077] The exhaust assembly 400 comprises two parts: a holding assembly 410 for suspending the gearbox in the middle of the inner liner 300, and a tumbling assembly 420 for providing driving force for the continuous tumbling of the gearbox. By controlling the tumbling and suspending of the gearbox separately by two assemblies, precise control of gearboxes of different sizes can be achieved.

[0078] See also Figure 3 In one embodiment, the maintaining component 410 includes:

[0079] The maintenance nozzles 411 are all located on the inner wall of the cooling box 100. Multiple maintenance nozzles 411 arranged longitudinally form a group, and multiple groups are evenly distributed in a ring along the inner wall of the cooling box 100.

[0080] The liquid inlet of the maintenance nozzle 411 is connected to the annular diversion groove 412 opened on the inner wall of the cooling tank 100, and the liquid outlet of the maintenance nozzle 411 in the same group is aligned with the position of the upper groove opening 320 so as to send the sprayed quenching medium into the inner liner 300.

[0081] The nozzles 411 are positioned on the inner wall of the cooling box 100. The sprayed quenching medium acts on the gearbox through the upper slot 320, ensuring that the suspended gearbox maintains a distance from the inner wall of the inner liner 300, thus preventing it from colliding with the inner liner 300 and the inner wall of the cooling box 100.

[0082] The annular diversion groove 412 is designed to uniformly deliver the quenching medium to the maintenance nozzles 411, ensuring that the force exerted on the gearbox by the quenching medium ejected from each maintenance nozzle 411 or even each group of maintenance nozzles 411 is approximately the same, so that the gearbox is always kept within the inner liner 300.

[0083] Preferably, each group of maintaining nozzles 411 has 4, and no less than 6 groups, with equal intervals between each group.

[0084] See also Figure 3 In one embodiment, the maintaining component 410 further includes:

[0085] The push nozzle 413 is vertically arranged on the bottom surface of the cooling box 100 and sends the sprayed quenching medium into the inner liner 300 through the hole 330.

[0086] In addition, in order to precisely control the height of the gearbox suspended within the inner liner 300, a push nozzle 413 is vertically arranged on the inner bottom surface of the cooling box 100. The quenching medium sprayed by the push nozzle 413 acts on the bottom of the gearbox, applying an upward force to the gearbox. This, combined with the force applied to the gearbox by the quenching medium sprayed by the nozzle 411, ensures that the gearbox is stably suspended within the quenching medium inside the inner liner 300.

[0087] In this embodiment, the push nozzle 413 and the tumbling assembly 420 are both located at the bottom inside the cooling box 100 and are relatively close to each other. Therefore, in order to simplify the pipeline layout, the push nozzle 413 and the tumbling assembly 420 share a pipeline for conveying the quenching medium.

[0088] See also Figure 3 and Figure 6 In one embodiment, the tumbling assembly 420 includes:

[0089] The rotating nozzle 421 is set on the bottom surface of the cooling box 100 and is distributed in a ring around the through hole 330. The rotating nozzle 421 is set at an angle, and the sprayed quenching medium passes through the corresponding lower slot 340 and converges in the middle of the inner liner 300.

[0090] The quenching medium ejected from the tilting nozzle 421 applies a centrifugal force to the gearbox, causing it to tilt while suspended. Therefore, the tilting nozzle 421 is tilted to eject the quenching medium, breaking the gearbox's suspension and causing it to tilt. To better control the gearbox's tilting speed and attitude, multiple tilting nozzles 421 are used, arranged in a ring around the through-hole 330, which facilitates uniform adjustment of the tilting angle of the nozzles.

[0091] See also Figure 3 and Figure 6 In one embodiment, the tilt angle of the flip nozzle 421 is adjustable.

[0092] Due to differences in the size, weight, and structural parameters of the gearbox, the quenching medium ejected from the tilting nozzle 421 will act on the gearbox at different speeds and with different postures. Therefore, by adjusting the tilt angle of the tilting nozzle 421, the force exerted by the ejected quenching medium on the gearbox can be changed, thereby achieving controllable speed and posture of gearbox rotation and thus improving the efficiency of exhausting residual air.

[0093] See also Figure 3 and Figure 5 In one embodiment, one side of the lid 200 is connected to the cooling box 100, and the other side is connected to the cooling box 100 via a fixing lock 220 to open or close. The lid 200 has a handle 230 on the circumferential side wall corresponding to the fixing lock 220 to assist in opening or closing the lid 200.

[0094] When the lid 200 is hinged to the cooling box 100, the lid 200 can be opened or closed more conveniently and easily by flipping it open using the handle 230. The locking mechanism 220 keeps the lid 200 closed when the cooling box 100 and the lid 200 are closed, preventing it from being pushed open by the quenching medium.

[0095] In addition, the mating surfaces of the cover 200 and the cooling box 100 adopt a stepped transition structure to improve sealing.

[0096] See also Figure 3 and Figure 5 In one embodiment, the bottom surface of the tank cover 200 has a protective filter cover 240, and the liquid inlet end of the discharge pipe 210 extends into the protective filter cover 240.

[0097] When the cover 200 is closed with the cooling box 100, the protective filter cover 240 extends into the upper opening of the inner liner 300.

[0098] On the one hand, it is used to prevent the overturned gearbox from damaging the bottom surface of the cover 200 and causing leakage; on the other hand, it protects the discharge pipe 210 that extends into the cooling tank 100, preventing the discharge pipe 210 from being hit by the overturned gearbox and from affecting the overturning of the gearbox. Preferably, the protective filter cover 240 is made of hard rubber.

[0099] See also Figure 3 and Figure 5 In one embodiment, the main inlet pipe 110 includes an upper inlet branch pipe 111 and a lower inlet branch pipe 112. The upper inlet branch pipe 111 is used to supply material to the holding assembly 410, and the lower inlet branch pipe 112 is used to supply material to the tumbling assembly 420.

[0100] The main inlet pipe 110 is split into upper inlet branch pipe 111 and lower inlet branch pipe 112, thereby supplying quenching medium to the holding assembly 410 and the tumbling assembly 420 respectively, so as to achieve different control of levitation force, tumbling speed and attitude.

[0101] In one embodiment, the upper inlet branch pipe 111 is used to supply quenching medium to the annular diversion channel 412, and the quenching medium is finally ejected from the holding nozzle 411. The tumbling assembly 420 is used to supply quenching medium to the push nozzle 413 and the tilt nozzle 421 arranged at the bottom of the inner side of the cooling tank 100. Preferably, the bottom of the cooling tank 100 has a lower diversion cavity c, and the push nozzle 413 and the tilt nozzle 421 are connected to the lower inlet branch pipe 112 through the lower diversion cavity c.

[0102] In one embodiment, in order to increase the internal pressure of the cooling tank 100 and prevent the quenching medium from flowing back, a one-way valve d is provided on the lower liquid inlet branch pipe 112 for pressurization and to prevent backflow.

[0103] 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.

Claims

1. A cooling device for heat treatment of ductile iron gearboxes, characterized in that, include: Cooling box (100) and box cover (200) that seals and closes to the top opening of the cooling box (100); The cooling tank (100) has a main liquid inlet pipe (110), and the top surface of the tank cover (200) has a discharge pipe (210). The discharge pipe (210) and the main liquid inlet pipe (110) are connected through a sealed cavity formed by the tank cover (200) and the cooling tank (100). The cooling box (100) is equipped with a hollow inner liner (300) and the cooling box (100) has an exhaust assembly (400) that keeps the quenched workpiece located in the middle of the inner side of the inner liner (300) and in a tumbling state. The inner liner (300) is a barrel-shaped structure with an open top. The inner liner (300) and the inner wall of the cooling box (100) have evenly distributed upper overflow ports (310) at the opening edge. The inner liner (300) has evenly distributed upper grooves (320) on the side wall. The inner liner (300) has a through hole (330) in the middle of the bottom surface, and an arc-shaped lower groove (340) is formed around the through hole (330). The bottom end of the inner liner (300) has a support plate (350) that is fixedly connected to the inner wall of the cooling box (100), and the support plate (350) has overflow ports (360) evenly distributed on it; The exhaust assembly (400) includes: a holding assembly (410) and a tumbling assembly (420); wherein, the holding assembly (410) is used to suspend the quenched workpiece in the middle of the inner liner (300); and the tumbling assembly (420) is used to provide driving force for the continuous tumbling of the quenched workpiece. The sustaining assembly (410) includes a sustaining nozzle (411), which is located on the inner wall of the cooling box (100). A group of sustaining nozzles (411) arranged longitudinally is formed, and multiple groups are evenly distributed in a ring along the inner wall of the cooling box (100). The liquid inlet of each of the sustaining nozzles (411) is connected to the annular diversion groove (412) opened on the inner wall of the cooling tank (100), and the liquid outlet of each of the sustaining nozzles (411) in the same group is corresponding to the position of the upper groove opening (320) so as to send the sprayed quenching medium into the inner liner (300). The tumbling assembly (420) includes: a tumbling nozzle (421), which is disposed on the bottom surface of the cooling box (100) and arranged in a ring around the through hole (330). The tumbling nozzle (421) is inclined and the sprayed quenching medium passes through the corresponding lower slot (340) and converges in the middle of the inner liner (300). The tilt angle of the tumbling nozzle (421) is adjustable.

2. The cooling device for heat treatment of ductile iron gearboxes according to claim 1, characterized in that, The maintaining assembly (410) further includes a push nozzle (413), which is vertically arranged on the bottom surface of the cooling box (100) and sends the sprayed quenching medium into the inner liner (300) through the through hole (330).

3. The cooling device for heat treatment of ductile iron gearboxes according to claim 1, characterized in that: The lid (200) is connected to the cooling box (100) on one side, and the other side is connected to the cooling box (100) via a fixing lock (220) to open or close. The lid (200) has a handle (230) on the circumferential side wall corresponding to the fixing lock (220) to assist in opening or closing the lid (200).

4. The cooling device for heat treatment of ductile iron gearboxes according to claim 3, characterized in that: The bottom surface of the box cover (200) has a protective filter cover (240), and the liquid inlet end of the discharge pipe (210) extends into the protective filter cover (240); when the box cover (200) is closed with the cooling box (100), the protective filter cover (240) extends into the upper opening of the inner liner (300).

5. The cooling device for heat treatment of ductile iron gearboxes according to claim 1, characterized in that: The main inlet pipe (110) includes an upper inlet branch pipe (111) and a lower inlet branch pipe (112). The upper inlet branch pipe (111) is used to supply material to the holding assembly (410), and the lower inlet branch pipe (112) is used to supply material to the tumbling assembly (420).

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