Energy-saving mesh belt furnace heat treatment production equipment and control method thereof

Abstract

The invention discloses energy-saving type mesh belt furnace heat treatment production equipment, and belongs to the technical field of heat treatment equipment, the energy-saving type mesh belt furnace heat treatment production equipment comprises a furnace body and a feed hopper fixedly connected with the furnace body, two limiting columns are fixed in the furnace body, two connecting blocks are movably connected to the outer walls of the limiting columns, a screening plate is fixed among the four connecting blocks, and the screening plate is movably connected with the limiting columns. A push-pull structure and a conveying structure are installed on the furnace body, an exhaust port is formed in the top of the furnace body, a heat exchanger is installed in the exhaust port, a gas conveying pipe is installed at one end of the heat exchanger, a gas hood is fixed to the bottom of the gas conveying pipe, a discharging port is formed in a bottom plate of the furnace body, and a guide hopper is fixed in the discharging port. And a plurality of mounting grooves are formed in the outer wall of one side of the guide hopper, and cooling fans are mounted in the mounting grooves. According to the energy-saving mesh belt furnace heat treatment production equipment, uniform discharging can be achieved, the heat treatment effect is improved, meanwhile, waste heat can be utilized, and more energy is saved in use.

Description

Technical Field

[0001] This invention belongs to the technical field of heat treatment equipment, specifically relating to an energy-saving mesh belt furnace heat treatment production equipment and its control method. Background Technology

[0002] Mesh belt furnaces, as continuous heat treatment equipment, are widely used in the annealing, normalizing, quenching and tempering, and carburizing processes of metal parts (fasteners, bearings, stampings, etc.). Their core advantage lies in their ability to achieve continuous material conveying and batch processing, making them suitable for large-scale industrial production needs.

[0003] However, existing mesh belt furnaces still suffer from uneven material feeding during the heat treatment of components such as self-tapping nuts. Traditional mesh belt furnaces often feed materials directly through the hopper, which can easily lead to agglomeration or stacking due to size differences and compression, resulting in uneven material distribution on the conveyor belt. This not only causes uneven heating of the material during heat treatment, resulting in localized overheating and underheating and affecting the consistency of product mechanical properties, but may also cause blockage of the conveyor channel due to stacking, reducing production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide an energy-saving mesh belt furnace heat treatment production equipment to solve the problem of uneven material feeding in the heat treatment process of existing mesh belt furnaces for components such as self-tapping nuts, as mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an energy-saving mesh belt furnace heat treatment production equipment, comprising a furnace body and a feeding hopper fixedly connected to the furnace body, wherein two limiting columns are fixedly fixed inside the furnace body, two connecting blocks are movably connected to the outer wall of the limiting columns, a screen plate is fixed between the four connecting blocks, and multiple discharge holes are opened on the screen plate, and a push-pull structure and a conveying structure are installed on the furnace body; Multiple resistance heating tubes are installed on the top wall and the inner walls of both sides of the furnace body, and a partition is installed on the top wall of the furnace body cavity. An exhaust port is opened on the top of the furnace body, and a heat exchanger is installed in the exhaust port. A gas supply pipe is installed at one end of the heat exchanger, and a gas cover is fixed at the bottom of the gas supply pipe. A discharge port is opened on the bottom plate of the furnace body, and a guide hopper is fixed in the discharge port. Multiple installation slots are opened on one side outer wall of the guide hopper, and a cooling fan is installed in the installation slot.

[0006] In a further embodiment, the push-pull structure consists of a protective box and a rotary motor. The rotary motor is installed inside the protective box, and a turntable is fixed to the top of the output shaft of the rotary motor. A connecting pin is fixed to the top of the turntable, and a push-pull rod is rotatably connected to the outside of the connecting pin.

[0007] In a further embodiment, the end of the push-pull rod away from the connecting pin is rotatably connected to a connecting seat, the connecting seat is fixedly connected to one side of the outer wall of the screen plate, and a positioning plate is fixed inside the protective box. The positioning plate is rotatably connected to the output shaft of the rotary motor through a bearing.

[0008] In a further embodiment, the conveying structure consists of a drive box, a drive motor, and multiple drive rollers. The drive motor is fixed to the outside of the drive box, and the multiple drive rollers are rotatably connected to the furnace body. A conveyor belt is provided on the outside of the multiple drive rollers.

[0009] In a further embodiment, a drive shaft is fixed to the output end of the drive motor, a plurality of driving bevel gears are fixed to the outer wall of the drive shaft, and a driven bevel gear that meshes with the driving bevel gear is fixed to one end of the drive roller.

[0010] In a further embodiment, a through groove is provided on one outer wall of the furnace body, and a collection box is movably connected in the through groove. A temperature sensor is installed on one inner wall of the furnace body.

[0011] In a further embodiment, the bottom of the guide hopper is fixed with an inclined guide plate, and the surface of the guide plate is fixed with a high-temperature resistant protective pad. The outer wall of the guide hopper away from the heat dissipation fan is provided with a discharge trough.

[0012] A control method for an energy-saving mesh belt furnace heat treatment production equipment, the control method comprising the following steps: S1. Preparations before startup: Check the furnace body sealing status, the installation of the collection box, and the integrity of the connection of each electrical component. Set the heat treatment temperature (500-1000℃, adjustable according to process requirements), screen plate reciprocating frequency, conveyor belt speed, and cooling fan speed through the controller. S2. Feeding control: Start the rotary motor, its output shaft drives the turntable to rotate, the connecting pin on the turntable drives the push-pull rod to reciprocate, the push-pull rod drives the screen plate to slide left and right along the limit post through the connecting seat, after the material falls from the feed hopper into the screen plate, it falls evenly onto the conveyor belt through the discharge hole to avoid stacking. S3, Conveying Control: The drive motor is started synchronously, and the output end of the drive motor drives the drive shaft to rotate. The active bevel gear on the drive shaft meshes with the driven bevel gear at one end of the drive roller, driving multiple drive rollers to rotate synchronously, thereby driving the conveyor belt to convey materials at a uniform speed. S4. Temperature Control: The resistance heating tube is activated to heat the inner cavity of the furnace. The temperature sensor collects the temperature data inside the furnace in real time and transmits it to the controller. When the temperature is lower than the set value, the controller increases the power of the resistance heating tube. When the temperature is higher than the set value, the controller reduces the power or stops heating to ensure that the temperature fluctuation error inside the furnace is ≤ ±5℃.

[0013] S5. Waste heat recovery control: High-temperature exhaust gas in the furnace enters the heat exchanger through the exhaust port. The heat exchanger transfers the heat energy in the exhaust gas to the air in the gas pipe. The heated air is blown to the material in the feeding area through the air hood to preheat the material and reduce the subsequent heating energy consumption. The exhaust gas after heat exchange is discharged from the other end of the heat exchanger. S6 Cooling control: When the material is conveyed to the discharge port at the bottom of the furnace body by the conveyor belt, it falls into the guide hopper. The cooling fan is started to blow cold air into the guide hopper to cool the material. The cooled material is discharged from the discharge chute along the inclined guide plate.

[0014] S7. Shutdown and Cleaning: After heat treatment, turn off the resistance heating tube, drive motor, rotary motor, and cooling fan in sequence. After the furnace body temperature drops to room temperature, remove the collection box, clean the collected debris (such as oxide scale), and complete the equipment reset. The technical effects and advantages of this invention are as follows: This energy-saving mesh belt furnace heat treatment production equipment drives the screen plate to slide back and forth along the limiting column through the push-pull structure. The material falls orderly through the discharge hole of the screen plate to the conveyor mesh belt, which effectively avoids material stacking, ensures the stability of material feeding, and allows each material to contact the heat source evenly, significantly reducing the product defect rate caused by uneven heating and improving the consistency of mechanical properties. The heat exchanger inside the exhaust port on the top of the furnace can efficiently recover the heat energy in the high-temperature waste gas, heat the cold air in the gas pipe and blow it to the material in the feeding area through the gas hood to achieve material preheating and reduce subsequent power consumption. The cooling fan inside the feed hopper can quickly cool the heat-treated material, shortening the cooling time. The inclined feed plate, combined with the high-temperature resistant protective pad, can ensure smooth material discharge and reduce collision damage. This energy-saving mesh belt furnace heat treatment production equipment can not only feed materials evenly and improve the heat treatment effect, but also utilize waste heat, making it more energy-efficient. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the feed hopper, screen plate, and rotary motor of the present invention. Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 This is a cross-sectional view of the furnace body and drive box of the present invention; Figure 5 This is a cross-sectional view of the furnace body of the present invention; Figure 6 This is a cross-sectional view of the feed hopper of the present invention.

[0017] In the diagram: 1. Furnace body; 2. Feed hopper; 3. Limiting post; 4. Connecting block; 5. Screen plate; 6. Protective box; 7. Rotary motor; 8. Turntable; 9. Connecting pin; 10. Push-pull rod; 11. Positioning plate; 12. Drive box; 13. Drive motor; 14. Drive shaft; 15. Driving bevel gear; 16. Drive roller; 17. Conveyor belt; 18. Driven bevel gear; 19. Collection box; 20. Resistance heating tube; 21. Temperature sensor; 22. Baffle plate; 23. Heat exchanger; 24. Gas pipe; 25. Gas hood; 26. Guide hopper; 27. Guide plate; 28. Cooling fan. Detailed Implementation

[0018] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0019] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this invention, and are explained here together.

[0020] This invention provides, for example Figure 1-6 The energy-saving mesh belt furnace heat treatment production equipment shown includes a furnace body 1 and a feed hopper 2 fixedly connected to the furnace body 1. The furnace body 1 adopts a multi-layer heat insulation structure, consisting of a high-temperature resistant stainless steel inner liner, a nano heat insulation coating, an aluminum silicate fiber insulation layer, and a steel plate outer shell, from the inside out. The thickness of the insulation layer is designed to be 80-150mm according to the heating temperature gradient, which can control the surface temperature of the furnace body 1 below 50℃ and reduce heat loss. Two limiting columns 3 are fixed inside the furnace body 1. Two connecting blocks 4 are movably connected to the outer wall of the limiting columns 3. Multiple rolling grooves are opened in the connecting blocks 4, and sliding balls that fit against the limiting columns 3 are rolled in the rolling grooves, which can make the connecting blocks 4 move more smoothly outside the limiting columns 3. A screen plate 5 is fixed between the four connecting blocks 4. Multiple discharge holes are opened on the screen plate 5. The size of the discharge holes matches the size of the workpiece (such as a self-tapping nut). A push-pull structure and a conveying structure are installed on the furnace body 1. The push-pull structure consists of a protective box 6 and a rotary motor 7. The protective box 6 is fixed to the back of the furnace body 1, and the rotary motor 7 is installed inside the protective box 6. A turntable 8 is fixed to the top of the output shaft of the rotary motor 7, and a connecting pin 9 is fixed to the top of the turntable 8. A push-pull rod 10 is rotatably connected to the outside of the connecting pin 9. Corresponding positions on the furnace body 1 and the protective box 6 are provided with moving slots for the push-pull rod 10 to move. A connecting seat is rotatably connected to the end of the push-pull rod 10 away from the connecting pin 9. The connecting seat is fixedly connected to one side of the outer wall of the screen plate 5. A positioning plate 11 is fixed inside the furnace 6. The positioning plate 11 is rotatably connected to the output shaft of the rotary motor 7 through a bearing. The positioning plate 11 can ensure the stability of the rotation of the turntable 8 when the rotary motor 7 is working. The rotary motor 7 drives the turntable 8 to rotate. With the help of the push-pull rod 10, the screen plate 5 can move back and forth in the furnace body 1. The self-tapping nuts fall in an orderly manner through the discharge holes on the screen plate 5 to avoid the accumulation of materials. This ensures that each self-tapping nut can be heated evenly during the subsequent heat treatment process, thereby improving the heat treatment effect. The conveying structure consists of a drive box 12, a drive motor 13, and multiple drive rollers 16. The drive box 12 is fixed to the back of the furnace body 1, the drive motor 13 is fixed to the outside of the drive box 12, and the multiple drive rollers 16 are rotatably connected to the inside of the furnace body 1 via bearings. A conveyor belt 17 is provided on the outside of the multiple drive rollers 16. The output end of the drive motor 13 is fixed to a drive shaft 14 via a coupling, and the other end of the drive shaft 14 is rotatably connected to the inner wall of the drive box 12 via a bearing, thereby ensuring the stability of the drive shaft 14 during rotation. Multiple active bevel gears 15 are fixed on the outer wall of the drive shaft 14. One end of the drive roller 16 is fixed with a driven bevel gear 18 that meshes with the active bevel gear 15. The drive motor 13 drives the drive shaft 14 and the active bevel gear 15 to rotate, thereby driving the driven bevel gear 18 and the drive roller 16 to rotate, which in turn drives the conveyor belt 17 to rotate, automatically conveying the self-tapping nuts. A through groove is opened on one side of the outer wall of the furnace body 1. A collection box 19 is movably connected in the through groove to facilitate the collection of debris generated during the heat treatment process. Multiple resistance heating tubes 20 are installed on the top wall and inner walls of both sides of the furnace body 1, which can heat the self-tapping nuts from all directions. A temperature sensor 21 is installed on one inner wall of the furnace body 1, which can monitor the temperature inside the furnace body 1 in real time. A baffle 22 is installed on the top wall of the inner cavity of the furnace body 1. An exhaust port is opened on the top of the furnace body 1, and a heat exchanger 23 is installed in the exhaust port. A gas supply pipe 24 is installed at one end of the heat exchanger 23, and a gas cover 25 is fixed at the bottom of the gas supply pipe 24. The baffle 22 can reduce the heat generated by the resistance heating tubes 20 from being transferred to one side of the heat exchanger 23. The heat exchanger 23 can transfer the excess heat generated after heat treatment, and the excess heat is transferred back to the furnace body 1 through the gas supply pipe 24 and the gas cover 25 to preheat the self-tapping nuts, reduce the subsequent heat treatment time, and make it more energy-efficient. A discharge port is provided on the bottom plate of the furnace body 1, and a guide hopper 26 is fixed inside the discharge port. Multiple mounting slots are provided on one outer wall of the guide hopper 26, and a cooling fan 28 is installed in the mounting slot. An inclined guide plate 27 is fixed at the bottom of the guide hopper 26. The inclination angle of the guide plate 27 can be set according to actual usage requirements to ensure that the self-tapping nuts fall smoothly. A high-temperature resistant protective pad is fixed on the surface of the guide plate 27 to reduce the impact of the self-tapping nuts during the falling process. A discharge groove is provided on the outer wall of the guide hopper 26 away from the cooling fan 28. With the operation of the cooling fan 28, the self-tapping nuts can be cooled during the descent, reducing subsequent waiting time and improving processing efficiency.

[0021] All standard parts used in this invention can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods of each part all adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The control method of this invention is through a controller, and the control circuit of the controller can be implemented by those skilled in the art through simple programming. It should be noted that the electrical components mentioned in this invention have been sorted according to the actual situation during manufacturing, so as not to cause the wire harness to become tangled or affect the operation. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0022] In the description of this invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] Working principle: When using this energy-saving mesh belt furnace heat treatment production equipment, first check the sealing status of the furnace body 1, the installation status of the collection box 19, and the integrity of the electrical component connections. Set parameters such as heat treatment temperature, reciprocating frequency of the screen plate 5, speed of the conveyor belt 17, and wind speed of the cooling fan 28 through the controller. After starting the equipment, the rotary motor 7 drives the turntable 8 to rotate. The connecting pin 9 on the turntable 8 drives the push-pull rod 10 to reciprocate. The push-pull rod 10 drives the screen plate 5 to slide left and right along the limit post 3 through the connecting seat. After the material falls from the feed hopper 2 into the screen plate 5, it falls evenly into the conveyor belt 17 through the discharge hole. The synchronously started drive motor 13 drives the drive shaft 14 to rotate. The active bevel gear 15 on the drive shaft 14 meshes with the driven bevel gear 18 at one end of the drive roller 16, causing multiple drive rollers 16 to rotate synchronously, thereby driving the conveyor belt 17 to convey materials at a uniform speed. The resistance heating tube 20 starts to heat the inner cavity of the furnace body 1. The temperature sensor 21 collects the temperature inside the furnace 1 in real time and transmits it to the controller. The controller adjusts the power of the resistance heating tube 20 according to the temperature deviation to ensure that the temperature inside the furnace is stable. High-temperature exhaust gas inside the furnace body 1 enters the heat exchanger 23 through the exhaust port, transferring heat energy to the air in the gas delivery pipe 24. The heated air is blown towards the material in the feeding area through the air hood 25 to achieve preheating. The exhaust gas after heat exchange is discharged from the other end of the heat exchanger 23. When the material is conveyed to the bottom discharge port of the furnace body 1, it falls into the guide hopper 26. The cooling fan 28 blows cold air into the guide hopper 26 to cool the material. The cooled material is discharged from the discharge chute along the inclined guide plate 27. After the heat treatment is completed, each electrical component is turned off in sequence. After the furnace body 1 cools down to room temperature, the collection box 19 is removed to clean the debris, and the equipment is reset.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving mesh belt furnace heat treatment production equipment, comprising a furnace body (1) and a feed hopper (2) fixedly connected to the furnace body (1), characterized in that: The furnace body (1) has two fixed limiting columns (3), and two connecting blocks (4) are movably connected to the outer wall of the limiting columns (3). A screen plate (5) is fixed between the four connecting blocks (4). The screen plate (5) has multiple discharge holes. The furnace body (1) is equipped with a push-pull structure and a conveying structure. Multiple resistance heating tubes (20) are installed on the top wall and the inner walls of both sides of the furnace body (1), and a partition (22) is installed on the top wall of the inner cavity of the furnace body (1). An exhaust port is opened on the top of the furnace body (1), and a heat exchanger (23) is installed in the exhaust port. A gas supply pipe (24) is installed at one end of the heat exchanger (23), and a gas cover (25) is fixed at the bottom of the gas supply pipe (24). A discharge port is opened on the bottom plate of the furnace body (1), and a guide hopper (26) is fixed in the discharge port. Multiple installation slots are opened on one side of the outer wall of the guide hopper (26), and a cooling fan (28) is installed in the installation slot.

2. The energy-saving mesh belt furnace heat treatment production equipment according to claim 1, characterized in that: The push-pull structure consists of a protective box (6) and a rotary motor (7). The rotary motor (7) is installed inside the protective box (6), and a turntable (8) is fixed to the top of the output shaft of the rotary motor (7). A connecting pin (9) is fixed to the top of the turntable (8), and a push-pull rod (10) is rotatably connected to the outside of the connecting pin (9).

3. The energy-saving mesh belt furnace heat treatment production equipment according to claim 2, characterized in that: The push-pull rod (10) is rotatably connected to a connecting seat at the end away from the connecting pin (9). The connecting seat is fixedly connected to the outer wall of one side of the screen plate (5). A positioning plate (11) is fixed inside the protective box (6). The positioning plate (11) is rotatably connected to the output shaft of the rotary motor (7) through a bearing.

4. The energy-saving mesh belt furnace heat treatment production equipment according to claim 1, characterized in that: The conveying structure consists of a drive box (12), a drive motor (13) and multiple drive rollers (16). The drive motor (13) is fixed to the outside of the drive box (12), and the multiple drive rollers (16) are rotatably connected to the furnace body (1). A conveyor belt (17) is provided on the outside of the multiple drive rollers (16).

5. The energy-saving mesh belt furnace heat treatment production equipment according to claim 4, characterized in that: The output end of the drive motor (13) is fixed with a drive shaft (14), and the outer wall of the drive shaft (14) is fixed with a plurality of active bevel gears (15). One end of the drive roller (16) is fixed with a driven bevel gear (18) that meshes with the active bevel gears (15).

6. The energy-saving mesh belt furnace heat treatment production equipment according to claim 1, characterized in that: A through groove is provided on one side of the outer wall of the furnace body (1), and a collection box (19) is movably connected in the through groove. A temperature sensor (21) is installed on one side of the inner wall of the furnace body (1).

7. The energy-saving mesh belt furnace heat treatment production equipment according to claim 1, characterized in that: The bottom of the guide hopper (26) is fixed with an inclined guide plate (27), and the surface of the guide plate (27) is fixed with a high temperature resistant protective pad. The outer wall of the guide hopper (26) away from the heat dissipation fan (28) is provided with a discharge trough.

8. A control method based on the device according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Preparations before startup: Check the sealing status of the furnace body (1), the installation status of the collection box (19) and the integrity of the connection of each electrical component. Set the heat treatment temperature (500-1000℃, adjustable according to process requirements), the reciprocating frequency of the screen plate (5), the speed of the conveyor belt (17) and the wind speed of the cooling fan (28) through the controller. S2, feeding control: Start the rotary motor (7), its output shaft drives the turntable (8) to rotate, the connecting pin (9) on the turntable (8) drives the push-pull rod (10) to reciprocate, the push-pull rod (10) drives the screen plate (5) to slide left and right along the limit post (3) through the connecting seat, after the material falls from the feed hopper (2) into the screen plate (5), it falls evenly onto the conveyor belt (17) through the discharge hole to avoid stacking; S3, Conveying control: The drive motor (13) is started synchronously. The output end of the drive motor (13) drives the drive shaft (14) to rotate. The active bevel gear (15) on the drive shaft (14) meshes with the driven bevel gear (18) at one end of the drive roller (16), driving multiple drive rollers (16) to rotate synchronously, thereby driving the conveyor belt (17) to convey materials at a uniform speed. S4. Temperature control: Start the resistance heating tube (20) to heat the inner cavity of the furnace body (1). The temperature sensor (21) collects the temperature data in the furnace in real time and transmits it to the controller. When the temperature is lower than the set value, the controller increases the power of the resistance heating tube (20). When the temperature is higher than the set value, the controller reduces the power or stops heating to ensure that the temperature fluctuation error in the furnace is ≤ ±5℃. S5. Waste heat recovery control: High-temperature exhaust gas in the furnace body (1) enters the heat exchanger (23) through the exhaust port. The heat exchanger (23) transfers the heat energy in the exhaust gas to the air in the gas delivery pipe (24). The heated air is blown to the material in the feeding area through the air cover (25) to achieve material preheating and reduce subsequent heating energy consumption. The exhaust gas after heat exchange is discharged from the other end of the heat exchanger (23). S6 Cooling control: When the material is conveyed to the discharge port at the bottom of the furnace body (1) via the conveyor belt (17), it falls into the guide hopper (26). The cooling fan (28) is started to blow cold air into the guide hopper (26) to cool the material. The cooled material is discharged from the discharge chute along the inclined guide plate (27). S7. Shutdown and cleaning: After the heat treatment is completed, turn off the resistance heating tube (20), drive motor (13), rotary motor (7) and cooling fan (28) in sequence. After the temperature of the furnace body (1) drops to room temperature, take out the collection box (19), clean the debris (such as oxide scale) collected inside, and complete the equipment reset.

Images