A bearing ring post-forging cooling device

Abstract

The present invention relates to a bearing ring post-forging cooling device, comprising a frame, on which a lifting mechanism, a turning mechanism, a discharge mechanism, a discharging mechanism, and a receiving mechanism are sequentially arranged from front to back along the material conveying direction. The bearing ring post-forging cooling device has high efficiency in cooling the bearing rings after forging. The lifting mechanism is used to lift the forged bearing rings. Since the available space in the production workshop is not sufficient, in order to extend the time the rings stay in the device and improve the cooling effect at the same time, the lifting mechanism is designed to lift obliquely upward. The turning mechanism is used to change the bearing rings from a lying state to a standing state, so that they enter the discharge mechanism for cooling. The discharging mechanism controls the discharging of the bearing rings one by one, and the receiving mechanism controls the receiving of the bearing rings. The production efficiency of the bearing rings is improved, the temperature of the cooled rings is low, and no air cooling is required, so they can directly enter the next production step.

Description

Technical Field

[0001] The present invention relates to a post-forging cooling device for bearing rings, and relates to the technical field of bearing ring production equipment. Background Art

[0002] In the production process of bearing rings, except for a few ring products using the direct turning process of tubes and bars, the main production process is heating - shearing - upsetting - punching - ring rolling - final forging and cooling forming. At present, the main material for bearing ring production by enterprises is GCr15 bearing steel, which belongs to high-carbon steel. The common process is as follows: After the bearing steel tube blank is heated by a walking intermediate frequency furnace, it is punched and cut into the weight and length determined by the process at a temperature of 1200 - 1150 °C; then the bar cut by heating and shearing is upset by a press to the required height and outer diameter; then the upset blank is placed in the lower die cavity, and the upper punch descends to extrude and form; secondly, the blind hole of the extruded blank is punched into a through hole by a punch; the blank after the through hole is placed in a ring rolling machine and rotated and rolled to expand and form; finally, to make the workpieces reach unified dimensions, the outer diameter of the outer forging blank and the outer diameter of the inner forging blank are trimmed. The bearing ring is still in a high-temperature stage from the initial 1200 °C to about 900 °C after final forging and shaping. Different final forging processes will have different effects on the quality of the ring products. If the bearing ring after high-temperature final forging cools slowly and unevenly, at 800 - 650 °C, due to the decrease in the solubility of carbon in austenite, the supersaturated carbon forms secondary carbides along the grain boundaries inside the ring, and then becomes coarse network carbides. Its metallographic structure presents a state of coarse lamellar pearlite + network carbides. The existence of network carbides reduces the mechanical properties of the steel and greatly reduces the service life. Larger network carbides will cause the ring to crack during the subsequent grinding process, and even produce quenching cracks during quenching. Reducing the temperature during final rolling or increasing the cooling rate before collection to quickly cool it below 650 °C can effectively avoid the precipitation of network carbides and improve the product performance.

[0003] During the cooling process of bearing steel from 900 °C to 650 °C, carbides precipitate along the grain boundaries to form network carbides, which directly affects the service performance of the bearing. At present, in production, after the hot forging of the bearing ring blank, the main cooling method is stack spray cooling, which cools slowly and unevenly, and is extremely easy to form coarse network carbides. The existence of network carbides weakens the bonding force between metals, reduces the mechanical properties of the steel. In particular, the impact toughness decreases, the brittleness increases, it is easy to cause intergranular cracking, and reduces the wear resistance of the steel.

[0004] However, at present, domestic manufacturing enterprises rarely have corresponding cooling devices in the post-forging cooling process of rings. Most of them use the form of packing and stacking for spraying. The rings cool slowly and unevenly, failing to meet the effects and requirements of the cooling process. Although a few enterprises have dedicated cooling equipment, such as devices combining long-distance conveyor belts with fans, and devices for batch receiving and batch oil immersion cooling. However, these devices are relatively simple, with a large human factor and serious environmental pollution at the site. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a post-forging cooling device for bearing rings.

[0006] To solve the above technical problem, the technical solution of the present invention is: a post-forging cooling device for bearing rings, including a frame, on which a lifting mechanism, a turning mechanism, a discharging mechanism, a discharging mechanism, and a receiving mechanism are sequentially arranged from front to back along the material conveying direction.

[0007] Preferably, the lifting mechanism includes a lifting frame, and a conveying chain is installed on the lifting frame and extends obliquely upward from front to back.

[0008] Preferably, the low-end feeding port of the conveying chain is connected to the discharging channel of the forging table, and the high-end discharging port is connected to the turning mechanism. Inside the lifting frame below the conveying chain, there is an ash chute extending obliquely upward from front to back, and the low end of the ash chute is connected to an ash collection box.

[0009] Preferably, the turning mechanism includes a feeding inclined plate and a sliding inclined plate. The feeding inclined plate slopes downward from front to back, and the sliding inclined plate slopes downward from right to left. The feeding inclined plate is connected between the high-end discharging port of the lifting mechanism and the sliding inclined plate, and the low end of the sliding inclined plate is connected to the discharging mechanism.

[0010] Preferably, the sliding inclined plate is composed of a number of rolling bars arranged front and back, and there are gaps between adjacent rolling bars through which small oxide scale debris and accumulated water can pass.

[0011] Preferably, a baffle is arranged at the rear side of the upper surface of the sliding inclined plate, and the baffle is driven by a driving mechanism to extend and retract forward and backward for adjustment.

[0012] Preferably, the discharging mechanism includes a U-shaped discharging trough sloping downward from front to back. The trough side and trough bottom of the U-shaped discharging trough are surrounded by cooling water pipes sloping downward from front to back. There are also gaps between adjacent cooling water pipes through which debris and accumulated water can pass, and ash chutes are correspondingly arranged below the gaps, and the low ends of the ash chutes are connected to an ash collection box.

[0013] Preferably, the discharging mechanism includes a discharging rack located on the low-end discharging port of the discharging mechanism, and a front movable seat body and a rear fixed seat body are provided on the discharging rack. The front movable seat body is driven by a driving mechanism to adjust the forward and backward translation, an inner material blocking rod is installed on the front movable seat body, and an outer material blocking rod is installed on the rear fixed seat body. The inner material blocking rod and the outer material blocking rod are driven to rise and fall respectively by the driving mechanism, and a temperature sensor with a probe facing downward is provided on the discharging rack between the inner material blocking rod and the outer material blocking rod, and a cooling water jacket is provided on the periphery of the temperature sensor.

[0014] Preferably, the material receiving mechanism includes a material receiving rack, on which a linear roller inclined downward from front to back is provided, the high end of the linear roller is connected to the material discharging mechanism, and the linear roller is driven by a motor installed on the material receiving rack to swing back and forth left and right.

[0015] Preferably, a plurality of cooling blowers are provided above the lifting mechanism and the discharging mechanism, and a water mist joint is installed on the blowing port below the cooling blower to combine water mist cooling with air cooling; a plurality of exhaust fans are provided at the top of the rack to remove water mist and heat inside the rack.

[0016] Compared with the prior art, the present invention has the following beneficial effects: the bearing ring post-forging cooling device has high efficiency in cooling the bearing rings after forging. A lifting mechanism is used to lift the forged bearing rings. Due to limited available space in the production workshop, the lifting mechanism is designed to lift the rings diagonally upward to extend the time the rings remain in the device while improving the cooling effect. A flipping mechanism is used to turn the bearing rings from a flat position to a standing position, allowing them to enter the discharge mechanism for cooling. The discharge mechanism controls the individual discharge of the bearing rings, and the collection mechanism controls the collection of the bearing rings. This improves the production efficiency of the bearing rings, and the cooled rings are kept at a lower temperature, eliminating the need for air cooling and allowing them to proceed directly to the next production step.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of an embodiment of the present invention.

[0019] Figure 2 A schematic diagram of the local structure of an embodiment of the present invention Figure 1 .

[0020] Figure 3 A schematic diagram of the local structure of an embodiment of the present invention Figure 2 .

[0021] Figure 4 A schematic diagram of the local structure of an embodiment of the present invention Figure 3 . DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] like Figures 1 to 4 As shown, this embodiment provides a post-forging cooling device for bearing rings, comprising a frame 1 on which are arranged, from front to back, a lifting mechanism 2, a turning mechanism 3, a discharge mechanism 4, a discharging mechanism 5, and a receiving mechanism 6. This device can adapt to different cooling rate requirements, effectively reduce the level of network carbides in bearing rings, and improve product quality.

[0026] In this embodiment of the present invention, the lifting mechanism includes a lifting frame 7, mounted with a conveyor chain 8 extending upward and obliquely from front to back. The roller gap is approximately 20 mm, allowing impurities such as scale that fall from the workpiece to fall through the gap into the ash chute below, facilitating cleanup. A three-phase asynchronous motor coupled with a variable frequency speed regulator drives the chain at an appropriate speed for lifting. Due to limited available space in the production workshop, the lifting mechanism is designed to lift the ferrule obliquely upward to extend the time the ferrule remains within the device and improve cooling.

[0027] In an embodiment of the present invention, a telescopic rod 9 is connected to the bottom of the lifting frame, which can be raised and lowered to adjust the height, and the side of the lifting frame has an arc-shaped mounting groove 10, which is locked to the top of the telescopic rod through a screw passing through the arc-shaped mounting groove. The loosening and tightening screws can adjust the inclination angle of the working surface of the lifting frame.

[0028] In an embodiment of the present invention, the lower end feed port of the conveying chain is connected to the forging table discharge channel, and the high end discharge port is connected to the flipping mechanism. An ash chute 11 extending upward from front to back is provided inside the lifting frame below the conveying chain, and the lower end of the ash chute is connected to the ash collection box 12.

[0029] In an embodiment of the present invention, the turning mechanism includes a feeding inclined plate 13 and a material sliding inclined plate 14. The feeding inclined plate is inclined downward from front to back, and the material sliding inclined plate is inclined downward from right to left. The feeding inclined plate is connected between the high-end discharge port of the lifting mechanism and the material sliding inclined plate, and the low end of the material sliding inclined plate is connected to the discharging mechanism. The ferrule falls into the turning mechanism at the end after being lifted, is turned over by the turning mechanism, and then enters the discharging mechanism. The turning mechanism is made of high-temperature resistant stainless steel material.

[0030] In an embodiment of the present invention, the material sliding inclined plate is composed of a number of rolling bars arranged front and back, and there is a 2-mm gap between adjacent rolling bars through which small oxide scale debris and accumulated water can pass.

[0031] In an embodiment of the present invention, a baffle plate 15 is arranged at the rear side of the upper surface of the material sliding inclined plate. The baffle plate is driven by a driving mechanism to telescopically adjust back and forth to adjust the width of the material sliding inclined plate, so as to adapt to ferrules of different sizes. After the ferrule enters the turning mechanism, the ferrule is changed from a lying state to a standing posture through the action of the inclined plane and gravity, that is, the turning of the ferrule is realized, so that the ferrule can be smoothly inserted into the slot of the discharging mechanism. The driving mechanism can adopt an electric push rod, a ball screw pair, a cylinder, an oil cylinder, etc.

[0032] In an embodiment of the present invention, the discharging mechanism includes a discharging frame 16. A U-shaped discharging groove 17 inclined downward from front to back is arranged on the discharging frame. The groove side and the groove bottom of the U-shaped discharging groove are surrounded by cooling water pipes 18 inclined downward from front to back. There are also gaps through which debris and accumulated water can pass between adjacent cooling water pipes. A slag chute is correspondingly arranged below the gap, and the low end of the slag chute is connected to a slag collection box.

[0033] In an embodiment of the present invention, the discharging mechanism is installed below the turning mechanism to receive the ferrules falling from the turning mechanism. Similarly, the discharging mechanism is made of high-temperature resistant stainless steel material. The trough body is composed of 8 stainless steel hollow pipes with an outer diameter of 20 mm and an inner diameter of 15 mm to form a U-shaped discharging groove. When cooling is carried out, water is passed through the trough body to cool it and assist in cooling the ferrules. One of the trough sides of the U-shaped discharging groove is driven by an electric push rod, a ball screw pair, a cylinder or an oil cylinder to adjust its left and right positions, so as to change the width of the U-shaped discharging groove and realize the function of adjustable width to adapt to bearing ferrules of different thicknesses existing on the production line.

[0034] In an embodiment of the present invention, a telescopic rod is connected to the bottom of the discharging frame, and the height can be adjusted up and down. And an arc-shaped mounting groove strip is arranged on the side of the discharging frame and is locked to the top of the telescopic rod by a screw passing through the arc-shaped mounting groove strip. Loosening and tightening the screw can adjust the inclination angle of the working surface of the discharging frame.

[0035] After entering the discharge mechanism, the rings are arranged in an orderly manner in front of the discharge mechanism through the action of the inclined surface and narrow surface, where they are cooled and prepared for discharge into the discharge mechanism. Because the lifting mechanism raises the rings to a certain height and the available space is limited, the discharge mechanism is designed to drop the rings at an angle to extend the time the rings stay in the device and increase the number of rings arranged to improve cooling efficiency.

[0036] In an embodiment of the present invention, the discharge mechanism includes a discharge rack 19 located at the lower discharge port of the discharge mechanism. The discharge rack is provided with a front movable seat 20 and a rear fixed seat 21. The front movable seat is driven by a drive mechanism for front and rear translation adjustment. The drive mechanism can be an electric push rod, a ball screw pair, a pneumatic cylinder, an oil cylinder, etc. An inner stopper rod 22 is mounted on the front movable seat, and an outer stopper rod 23 is mounted on the rear fixed seat. The inner and outer stopper rods are respectively driven up and down by lifting cylinders 24. A temperature sensor 25 with a downward-facing probe is provided on the discharge rack between the inner and outer stopper rods. The outer periphery of the temperature sensor is sheathed with a cooling water jacket 26. Real-time temperature data of the bearing ring between the two rods is collected to control the release of the ring.

[0037] The ferrule enters the discharging mechanism from the discharge mechanism, and the temperature sensor of the online infrared thermometer detects whether the ferrule has reached the release temperature. At the same time, the release action is realized through the differential movement between the inner and outer rods of the material stop. The release process is as follows:

[0038] (1) Initialization, waiting for the workpiece to enter;

[0039] (2) The outer rod (the blocking rod near the exit) keeps falling to stop the workpiece from rolling down, the inner rod rises, and the thermometer measures the temperature of the workpiece entering the temperature measurement area;

[0040] (3) When the workpiece temperature reaches the release requirement, the inner rod falls to stop the subsequent workpieces, and the outer rod rises to release the workpieces that have reached the temperature standard;

[0041] (4) After the delayed release, the outer rod falls, and then the inner rod rises to allow the next workpiece to roll into the temperature measurement area; the previous actions are repeated to achieve temperature measurement and release of each workpiece.

[0042] Since the device will be in a high-temperature environment for a long time during operation, a sensor protection cooling water jacket is designed for the sensor, which uses the heat transfer of water flow and metal to achieve the effect of cooling.

[0043] In this embodiment of the present invention, the receiving mechanism comprises a receiving frame 27, equipped with a linear roller track 28 that slopes downward from front to back. The upper end of the linear roller track connects to the discharge mechanism, and the linear roller track is driven by a motor mounted on the receiving frame to swing back and forth. The receiving mechanism is mounted at the end of the discharge mechanism and receives bearing rings that have passed temperature measurement and meet release requirements. The linear roller track is 550 mm above ground level and tilted at a 15° angle to the ground. A sensor block is positioned on the synchronous shaft and works in conjunction with a proximity switch to achieve timed automatic forward and reverse rotation of the motor.

[0044] The accumulation of ferrules in the receiving bin can lead to uneven heat dissipation. To prevent this, after entering the receiving mechanism, the ferrules are rolled onto an inclined linear track to the receiving bin. Simultaneously, the linear track is driven by a motor, which continuously switches between forward and reverse rotation. The rotation principle is as follows: The ferrule rotates at an appropriate speed. When a flap synchronized with the shaft rotates to the left (right) proximity switch, the motor begins reverse rotation. When the flap rotates to the opposite proximity switch, the motor reverses again. This achieves automatic control of forward and reverse rotation and ensures uniform material collection.

[0045] In an embodiment of the present invention, multiple cooling blowers 29 are installed above the lifting and discharge mechanisms. A water mist connector is installed at the lower air outlet of each cooling blower, combining water mist cooling with air cooling. The combined effect of water mist cooling and air cooling is achieved through the movement of the fan blades. Two cooling groups of cooling blowers are installed at the lifting mechanism. Three cooling groups of cooling blowers are installed at the discharge mechanism. Water-jacketed online infrared thermometers are installed next to the groups to measure the temperature of the ferrules in real time for feedback and control of cooling capacity. Multiple exhaust fans 31 are installed at the very top of the frame to remove water mist and heat from the frame. Due to the high operating temperature, the humidity and temperature inside the device remain high. Therefore, a partition design is incorporated at the top of the device, and four industrial exhaust fans are installed to promptly remove water mist and internal heat, ensuring stable operation of the internal electronic components and air supply components.

[0046] The device's electronic control components, such as relays, industrial computers, and touch screens, are housed in an electrical control box. The temperature and humidity of the control box determine the stability of the device's automated production. Therefore, the box features a hollowed-out convection and thermal insulation design. Two small fans, operating with downward suction and upward exhaust, remove excess water mist and heat. A polyurethane thermal insulation panel is installed on the side of the box closest to the device housing.

[0047] In an embodiment of the present invention, water from the discharge mechanism, water mist joint, and cooling water jacket of the device all flows downward to the water collection tank 32 at the bottom of the frame, wherein the high end of the cooling water pipe of the discharge mechanism flows downward to the fine-pore water tank 33 below. Water flows through several fine holes on the bottom side of the fine-pore water tank, and the water flow slows down, the water droplets are refined, and the water temperature drops. Finally, the water flows downward to the micro-pore inclined plates 30 on both sides, and then flows back downward to the water collection tank.

[0048] Specific implementation process:

[0049] The forged rings are rolled into the lifting mechanism through the existing material channels. After being lifted, the rings fall into the turning mechanism at the end, and after being turned over by the turning mechanism, they enter the discharging mechanism. After the rings enter the discharging mechanism, the rings are arranged in an orderly manner one by one in front of the discharging mechanism through the action of the inclined surface and the narrow surface, and are cooled and prepared to enter the discharging mechanism for release. The rings enter the discharging mechanism from the discharging mechanism, and the temperature sensor of the online infrared thermometer detects whether the rings reach the release temperature, and at the same time, the release action is realized through the differential movement between the inner and outer retaining rods. The release process is as follows:

[0050] (1) Initialization, waiting for the workpiece to enter;

[0051] (2) The outer rod (the blocking rod near the outlet) remains lowered to block the rolling-down workpiece, the inner rod rises, and the thermometer measures the temperature of the workpiece entering the temperature measurement area;

[0052] (3) When the temperature of the workpiece reaches the release requirement, the inner rod falls to block the subsequent workpieces, and the outer rod rises to release the workpieces whose temperature has reached the standard after measurement;

[0053] (4) After a delay in release, the outer rod falls, and then the inner rod rises to allow the next workpiece to roll into the temperature measurement area; repeat the previous actions to realize the temperature measurement and release of each workpiece.

[0054] After the rings enter the receiving mechanism, they roll through the inclined straight raceway to the receiving box.

[0055] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0056] 1. The cooling efficiency of the bearing rings after forging is high. In the present application, through the combination of fan cooling and water mist cooling, preliminary cooling starts when the rings enter the lifting mechanism. After entering the discharging mechanism, batch cooling of the rings is realized. After cooling to the release temperature, each ring is measured for temperature and released one by one.

[0057] 2. The cooling efficiency of the bearing rings after forging is not wasted. An infrared temperature sensor is arranged beside the distribution of the cooling group, and the start and stop of the cooling group are automatically controlled according to the current temperature state. For example, if the discharging temperature is set to 400 degrees Celsius and the temperature measurement in the middle section of the device has reached below 400, it is determined that the cooling efficiency is excessive, and the water mist and fan of the subsequent cooling group are turned off.

[0058] 3. The cooling speed of the bearing rings after forging is controllable. The fan used for cooling can be speed-controlled by frequency conversion, and the size of the water mist can be adjusted by adjusting the water output of the solenoid valve to meet more complex cooling requirements.

[0059] 4. The production efficiency of the bearing ring is improved. The temperature of the cooled ring is relatively low, and there is no need for air cooling anymore. It can directly enter the next production step.

[0060] 5. The device has strong adjustability, and it is very convenient to adjust the positions of the channels, fans, water mist, and the positioning of the entire device.

[0061] 6. It is green and environmentally friendly. The cooling water circulates internally, and the generated waste residues are collected by the collection tank, which is environmentally friendly.

[0062] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A post-forging cooling device for a bearing ring, characterized in that: It includes a frame. Along the material conveying direction on the frame, a lifting mechanism, a turning mechanism, a discharging mechanism, a discharging outlet mechanism, and a material receiving mechanism are sequentially arranged from front to back. The lifting mechanism includes a lifting frame, and a conveying chain that extends obliquely upward from front to back is installed on the lifting frame. The low-end feeding port of the conveying chain is connected to the discharging channel of the forging table, and the high-end discharging port is connected to the turning mechanism. Inside the lifting frame below the conveying chain, there is an ash chute that extends obliquely upward from front to back, and the low end of the ash chute is connected to an ash collection box. The turning mechanism includes a feeding inclined plate and a sliding material inclined plate. The feeding inclined plate is inclined downward from front to back, and the sliding material inclined plate is inclined downward from right to left. The feeding inclined plate is connected between the high-end discharging port of the lifting mechanism and the sliding material inclined plate, and the low end of the sliding material inclined plate is connected to the discharging mechanism. The sliding material inclined plate is composed of a number of rolling bars arranged front and back, and there are gaps between adjacent rolling bars through which small oxide scale debris and accumulated water can pass. A baffle is arranged at the rear side of the upper surface of the sliding material inclined plate, and the baffle is driven by a driving mechanism to adjust its front and back telescoping. The discharging mechanism includes a U-shaped discharging chute that is inclined downward from front to back. The chute side and the chute bottom of the U-shaped discharging chute are surrounded by cooling water pipes that are inclined downward from front to back. There are also gaps between adjacent cooling water pipes through which debris and accumulated water can pass. Below the gaps, there are corresponding ash chutes, and the low ends of the ash chutes are connected to the ash collection box. The discharging outlet mechanism includes a discharging outlet frame located at the low-end discharging port of the discharging mechanism. On the discharging outlet frame, there is a front movable seat body and a rear fixed seat body. The front movable seat body is driven by a driving mechanism to adjust its front and back translation. A baffle inner rod is installed on the front movable seat body, and a baffle outer rod is installed on the rear fixed seat body. The baffle inner rod and the baffle outer rod are respectively driven by a driving mechanism to lift. A temperature sensor with its probe facing downward is arranged on the discharging outlet frame between the baffle inner rod and the baffle outer rod, and a cooling water jacket is sleeved on the outer periphery of the temperature sensor. The material receiving mechanism includes a material receiving frame, and a linear rolling track that is inclined downward from front to back is arranged on the material receiving frame. The high end of the linear rolling track is connected to the discharging mechanism, and the linear rolling track is driven by a motor installed on the material receiving frame to swing left and right reciprocally. Above the lifting mechanism and the discharging mechanism, there are multiple cooling blowers. A water mist joint is installed on the lower blowing outlet of the cooling blower for combined water mist cooling and air cooling. At the top of the frame, there are multiple exhaust fans for exhausting water mist and the heat inside the frame to the outside.

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