Annealing furnace for heat treatment of wear-resistant casting

Abstract

An annealing furnace for heat treatment of wear-resistant castings belongs to the technical field of wear-resistant casting annealing, and aims to solve the problems that when an annealing furnace is used, a door body mostly adopts a structure that the edge of the door body is directly attached to a sealing surface of a furnace mouth to move, local clearance or overpressure abrasion of the sealing surface is easy to occur during high-temperature annealing, and sealing failure is easy to cause after long-time work; inert gas introduced into the furnace circulates in a furnace door after being preheated, heat preservation can be conducted on the furnace door, the temperature difference between the interior and the exterior of the furnace door is reduced, the situation that due to the large temperature difference between the interior and the exterior of the furnace door, a sealing face is prone to deformation is reduced, and the service life of the furnace door is prolonged. And meanwhile, the furnace door transversely moved by means of air pressure can be prevented from directly moving in a manner of being attached to the main body furnace and being easily worn to cause the problem of sealing failure, so that the stability and safety of long-term use of the main body furnace can be ensured, and the leakage of heat and harmful gas during annealing is avoided.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of annealing of wear-resistant castings, in particular to an annealing furnace for heat treatment of wear-resistant castings. BACKGROUND

[0002] The annealing furnace for wear-resistant castings is a special equipment for heat treatment of advanced steel materials such as high manganese steel, high chromium cast iron, medium chromium cast iron and high-temperature wear-resistant steel, and is widely applied in the fields of mining machinery, cement building materials, engineering machinery, automobiles and wind power.

[0003] At present, when the annealing furnace for wear-resistant castings is used, the structure of directly moving the edge of the door body close to the sealing surface of the furnace mouth is adopted for the up-down opening furnace door body. The thermal expansion amount of the door body metal frame is different from that of the furnace body under high temperature, and local gap or overpressure wear of the sealing surface is prone to occur. Long-time work can easily lead to sealing failure, so that the annealing heat and harmful gas leakage can be caused. At the same time, impurity particles can be generated due to friction caused by long-time opening and closing of the sealing fitting position, the impurity particles can be attached and accumulated on the fitting surface, the sealing effect can be affected and the wear can be accelerated, and the annealing effect can also be affected due to the sealing failure.

[0004] In view of the above problems, the application provides an annealing furnace for heat treatment of wear-resistant castings. SUMMARY

[0005] The application aims to provide an annealing furnace for heat treatment of wear-resistant castings, which is used to solve the problems of the annealing furnace in the background, that is, the furnace door body adopts the structure of directly moving the edge of the door body close to the sealing surface of the furnace mouth, local gap or overpressure wear of the sealing surface is prone to occur under high temperature annealing, long-time work can easily lead to sealing failure, and annealing heat and harmful gas leakage can be caused.

[0006] To achieve the above object, the application provides the following technical scheme: an annealing furnace for heat treatment of wear-resistant castings, which comprises a main furnace and a furnace cavity arranged on the inner side of the main furnace. The bottom of the main furnace is provided with a trolley sliding rail, and the upper surface of the trolley sliding rail is provided with a feeding trolley. A limiting sliding groove is formed below the surface of the furnace cavity. The outer part of the main furnace is fixedly provided with a fixed frame, and the upper part of the main furnace is fixedly provided with a hydraulic cylinder on both sides. A lifting door frame is slidably arranged in the inner part of the fixed frame, and the middle part of the lifting door frame is fixedly provided with a furnace door. The upper part of the main furnace is connected with an air inlet mechanism, and the air inlet mechanism is communicated with the furnace door and the furnace cavity. An absorption mechanism is arranged at one end of the furnace door, and a pressure relief valve is communicated with one side surface of the furnace door. An air outlet mechanism is arranged on the other side surface of the furnace door. An air seal mechanism is arranged on the surface periphery of the furnace door.

[0007] Further, the air inlet mechanism comprises an air distribution cover fixed in the inner wall above the main furnace, and one side of the air distribution cover is communicated with an air inlet pipe, the inner side of the air distribution cover is fixed with a flow guide plate, and the other side of the air distribution cover is communicated with an air guide pipe above.

[0008] Further, the furnace door comprises a fixed door plate fixedly connected with the lifting door frame, and the inner side of the fixed door plate is provided with a door inner cavity, one side of the door inner cavity is communicated with an air inlet valve, and the air guide pipe is communicated with the door inner cavity through the air inlet valve.

[0009] Further, the inner side of the fixed door plate is slidably provided with a movable door plate, one end of the movable door plate is fixedly provided with a sliding plate, the movable door plate is slidably connected with the door inner cavity through the sliding plate, and the sliding plate is tightly fitted with the door inner cavity, the sliding column is fixedly arranged on the surface of the movable door plate, and the sliding column is slidably and sealingly arranged with the fixed door plate, the outer side of the sliding column is provided with a supporting spring, and the two ends of the supporting spring are respectively fixed with the movable door plate and the fixed door plate.

[0010] Further, the absorption mechanism comprises a suction box fixed on the surface of the fixed door plate, and the inner side of the suction box is slidably provided with a piston plate, and the piston plate is slidably and sealingly arranged with the suction box, one side of the piston plate is fixedly connected with one end of the sliding column.

[0011] Further, the one side of the suction box is fixedly communicated with a one-way valve above, and the one side of the suction box is fixedly communicated with an exhaust valve below, and the one-way valve is communicated with a collection box above.

[0012] Further, the inner side of the collection box is provided with a dust filter, and the upper side of the collection box is communicated with a flow pipe, the front side of the flow pipe is communicated with an air distribution pipe, and the surface of the air distribution pipe is provided with an absorption port, and the surface of the one side of the suction box is provided with an exhaust port.

[0013] Further, the air outlet mechanism comprises an air passage one arranged on the surface of the movable door plate, and the inner side of the air passage one is provided with a rotating valve one, one side of the rotating valve one is fixedly provided with a spring one, and the rotating valve one is elastically connected with the movable door plate through the spring one, and the lower side of the rotating valve one is provided with a limiting block one, and the limiting block one is fixedly connected with the movable door plate, and the front side of the air passage one is provided with a jet port.

[0014] Further, the air seal mechanism comprises an air passage two arranged on the surface of the movable door plate, and the inner side of the air passage two is provided with a rotating valve two, one side of the rotating valve two is fixedly provided with a spring two, and the rotating valve two is elastically connected with the movable door plate through the spring two.

[0015] Further, the lower side of the rotating valve disc two is provided with a limit block two, and the limit block two is fixedly connected with the moving door plate, the front side of the air passage two is fixedly communicated with an air outlet head, the upper side of the air outlet head is provided with a gas collection groove, and the gas collection groove is arranged on the surface of the main furnace.

[0016] Compared with the prior art, the present application has the following advantages: 1、The inert gas entering the furnace is preheated and flows through the furnace door, which can heat the furnace door, reduce the temperature difference between the inside and outside of the furnace door, reduce the deformation of the sealing surface caused by the large temperature difference between the inside and outside of the furnace door, and prevent the sealing failure caused by the deformation of the sealing surface. At the same time, the furnace door is first moved downward, and then moved horizontally by relying on the air pressure, which can prevent the furnace door from directly sticking to the main furnace and causing wear and tear, thereby ensuring the stability and safety of the main furnace during long-term use and preventing heat and harmful gas from leaking during annealing.

[0017] 2、When the furnace door is moved in the opposite direction and separated from the main furnace, air is sucked from the abutting surface, thereby absorbing the particles generated by friction at the abutting surface and the possible impurities, preventing the impurities from adhering and accumulating on the abutting surface and affecting the sealing effect and accelerating wear and tear, thereby ensuring the cleanliness of the sealing abutting surface and the stability and safety of the annealing work during long-term use. At the same time, the absorption mechanism absorbs the impurity particles, which can prevent the impurity particles from causing secondary pollution to the abutting surface and prevent the impurity particles from polluting the surface of the castings after annealing.

[0018] 3、The present application can form a gas curtain at the sealing gap to block the infiltration of external air from the gap, cooperate with the abutting and sealing of the furnace door, effectively reduce the leakage of the protective gas in the furnace, and thereby ensure the effectiveness of the annealing treatment of high-precision wear-resistant castings. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is an overall furnace door opening three-dimensional structure schematic diagram of the present application; Figure 2 It is an overall furnace door closing three-dimensional structure schematic diagram of the present application; Figure 3 It is a lifting door frame three-dimensional structure schematic diagram of the present application; Figure 4 It is a gas distribution cover cross-sectional internal three-dimensional structure schematic diagram of the present application; Figure 5 It is a fixed door plate closed cross-sectional internal three-dimensional structure schematic diagram of the present application; Figure 6 It is a Figure 5 It is an enlarged three-dimensional structure schematic diagram of A in the present application; Figure 7 It is a Figure 5Amplified perspective view of the structure at B; Figure 8 Cutaway view of the internal structure of the suction box of the present application.

[0020] In the figure: 1, main furnace; 2, furnace cavity; 3, fixed frame; 4, hydraulic cylinder; 5, lifting door frame; 6, furnace door; 61, fixed door panel; 62, door inner cavity; 63, air inlet valve; 64, movable door panel; 65, sliding plate; 66, sliding column; 67, supporting spring; 7, air inlet mechanism; 71, air distribution cover; 72, air inlet pipe; 73, deflector; 74, air guide pipe; 8, absorption mechanism; 81, suction box; 82, piston plate; 83, one-way valve; 84, exhaust valve; 85, collection box; 86, dust filter plate; 87, flow-through pipe; 88, air distribution pipe; 89, suction port; 810, exhaust port; 9, air outlet mechanism; 91, air passage one; 92, rotating valve disc one; 93, spring one; 94, limit block one; 95, air jet port; 10, air seal mechanism; 101, air passage two; 102, rotating valve disc two; 103, spring two; 104, limit block two; 105, air outlet head; 106, gas collection groove; 20, pressure relief valve; 30, trolley slide rail; 40, feeding trolley; 50, limit sliding groove. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0022] In order to solve the technical problem that the furnace door body of the annealing furnace is directly attached to the furnace port sealing surface at the edge of the door body during use, and the local gap or overpressure wear of the sealing surface is easy to occur during high-temperature annealing, and long-time work is easy to cause sealing failure, thereby causing the leakage of annealing heat and harmful gas, such as Figures 1-5 As shown in the figure, the following preferred technical solutions are provided: The utility model provides an annealing furnace for wear -resisting casting heat treatment, including main furnace 1 and the furnace chamber 2 of setting in the inside of main furnace 1, and main furnace 1 is the existing resistance furnace, and through resistance heating principle heating, when annealing treatment is used to the high -performance wear -resisting casting of automobile, wind power and so on field and some specific products, through the control heating, heat preservation and cooling process, eliminates the stress in casting, to carry out heat treatment to casting, and the specific principle of existing resistance main furnace 1, this case will not repeat, the bottom of main furnace 1 is provided with trolley slide rail 30, and the upper surface of trolley slide rail 30 is provided with feeding trolley 40, and the surface below of furnace chamber 2 is provided with limit sliding slot 50, and feeding trolley 40 can move in the bottom of main furnace 1 along trolley slide rail 30 and limit sliding slot 50 to facilitate the loading and unloading of high -performance wear -resisting casting before and after heat treatment, and when feeding trolley 40 moves to the position in main furnace 1, one end of feeding trolley 40 is just flush with the entrance side of main furnace 1, and the other end of feeding trolley 40 is just flush with the back wall of main furnace 1, so that the movable trolley type furnace bottom structure of existing principle is formed.

[0023] The utility model provides an annealing furnace for wear -resisting casting heat treatment, including main furnace 1 and the furnace chamber 2 of setting in the inside of main furnace 1, and main furnace 1 is the existing resistance furnace, and through resistance heating principle heating, when annealing treatment is used to the high -performance wear -resisting casting of automobile, wind power and so on field and some specific products, through the control heating, heat preservation and cooling process, eliminates the stress in casting, to carry out heat treatment to casting, and the specific principle of existing resistance main furnace 1, this case will not repeat, the bottom of main furnace 1 is provided with trolley slide rail 30, and the upper surface of trolley slide rail 30 is provided with feeding trolley 40, and the surface below of furnace chamber 2 is provided with limit sliding slot 50, and feeding trolley 40 can move in the bottom of main furnace 1 along trolley slide rail 30 and limit sliding slot 50 to facilitate the loading and unloading of high -performance wear -resisting casting before and after heat treatment, and when feeding trolley 40 moves to the position in main furnace 1, one end of feeding trolley 40 is just flush with the entrance side of main furnace 1, and the other end of feeding trolley 40 is just flush with the back wall of main furnace 1, so that the movable trolley type furnace bottom structure of existing principle is formed.

[0024] The utility model provides an annealing furnace for wear -resisting casting heat treatment, including main furnace 1 and the furnace chamber 2 of setting in the inside of main furnace 1, and main furnace 1 is the existing resistance furnace, and through resistance heating principle heating, when annealing treatment is used to the high -performance wear -resisting casting of automobile, wind power and so on field and some specific products, through the control heating, heat preservation and cooling process, eliminates the stress in casting, to carry out heat treatment to casting, and the specific principle of existing resistance main furnace 1, this case will not repeat, the bottom of main furnace 1 is provided with trolley slide rail 30, and the upper surface of trolley slide rail 30 is provided with feeding trolley 40, and the surface below of furnace chamber 2 is provided with limit sliding slot 50, and feeding trolley 40 can move in the bottom of main furnace 1 along trolley slide rail 30 and limit sliding slot 50 to facilitate the loading and unloading of high -performance wear -resisting casting before and after heat treatment, and when feeding trolley 40 moves to the position in main furnace 1, one end of feeding trolley 40 is just flush with the entrance side of main furnace 1, and the other end of feeding trolley 40 is just flush with the back wall of main furnace 1, so that the movable trolley type furnace bottom structure of existing principle is formed.

[0025] Simultaneously, when the inert gas in the air intake mechanism 7 is introduced into the furnace door 6, under the action of air pressure, it will first push the movable surface on the inner side of the furnace door 6 to move, allowing the furnace door 6, which has moved down to the front of the inlet of the main furnace 1 and is not in contact with the main furnace 1, to move laterally. This allows the furnace door 6, which moves down first and then laterally, to complete the sealing of the inlet of the main furnace 1. After sealing, annealing treatment is carried out. At this time, the furnace door 6, which moves down first and then laterally, can prevent the furnace door 6 from moving directly against the main furnace 1, which is prone to wear and sealing failure over a long period of time. This can ensure the stability and safety of the main furnace 1 in long-term use and avoid the problem of heat and harmful gas leakage during annealing. At the same time, the lateral movement of the furnace door 6 is directly driven by the protective gas introduced into the furnace by the air intake mechanism 7. While keeping the furnace door 6 warm and reducing the temperature difference between the inside and outside, it also eliminates the need for additional hydraulic or electric push rod drive mechanisms, saving energy consumption and cost of drive components.

[0026] An absorption mechanism 8 is installed at one end of the furnace door 6, and a pressure relief valve 20 is connected to one side surface of the furnace door 6. When the furnace door 6 moves laterally, it drives the absorption mechanism 8 to move, enabling the absorption mechanism 8 to perform a one-way exhaust action. When the casting annealing is completed and the furnace door 6 needs to be opened, the air intake mechanism 7 stops the air flow, and then the controller controls the solenoid valve 20 to open, allowing the gas filled into the furnace door 6 to be depressurized and discharged. At this time, the pressure of the furnace door 6 disappears and it moves in the opposite direction, separating from the main furnace 1 again. When the furnace door 6 moves in the opposite direction, it also drives the absorption mechanism 8 to move, enabling the absorption mechanism 8 to perform a one-way intake action. The air intake of the 8 is located at the joint between the furnace door 6 and the main furnace 1. When the furnace door 6 moves in the opposite direction and separates from the main furnace 1, air will be drawn from the joint surface. This will absorb the particles generated by friction at the joint and any impurities that may adhere to it, preventing impurities from accumulating on the joint surface, which would affect the sealing effect and accelerate wear. This ensures the cleanliness of the sealed joint and guarantees the stability and safety of the annealing process over a long period of time. At the same time, the absorption mechanism 8 absorbs the impurity particles instead of blowing them off directly, which can prevent the impurity particles from causing secondary contamination of the joint surface and prevent the impurity particles from contaminating the surface of the annealed casting.

[0027] An exhaust mechanism 9 is provided on the other side of the furnace door 6. Inert gas introduced through the inlet mechanism 7 fills the furnace door 6, causing it to slide laterally and fit against the main furnace 1. As the gas pressure increases, it pushes open the exhaust mechanism 9, allowing overpressurized gas to be ejected from the exhaust mechanism 9 into the furnace cavity 2 to replace oxygen within the cavity. This creates a directional airflow from one side of the furnace door 6 into the furnace cavity 2, breaking the static state of the gas inside the furnace and promoting rapid and uniform mixing of the inert protective gas. An air outlet is provided around the outer surface of the furnace door 6. As the air pressure inside the furnace door 6 increases, the air pressure will push open the gas outlet mechanism 9 and the gas sealing mechanism 10, causing the overpressurized airflow to be ejected from the gas sealing mechanism 10. The gas outlet of the gas sealing mechanism 10 faces the sealing edge of the furnace door 6 after it is closed, so that the introduced protective gas forms an air curtain at the sealing gap, preventing external air from seeping in from the gap. Combined with the close sealing of the furnace door 6, it can effectively reduce the possibility of leakage of protective gas inside the furnace, thereby ensuring the effectiveness of the annealing treatment of high-precision wear-resistant castings.

[0028] The air intake mechanism 7 includes a gas distribution hood 71 fixed in the inner wall above the main furnace 1. One side of the gas distribution hood 71 is connected to an air intake pipe 72, which is connected to an external gas supply device. Inert gas can be introduced into the gas distribution hood 71. A guide plate 73 is fixed to the inner side of the gas distribution hood 71, and a guide pipe 74 is connected to the upper side of the other side of the gas distribution hood 71. The guide pipe 74 is a flexible, extendable hose that can extend and retract with the up-and-down movement of the furnace door 6. The inert gas introduced through the air intake pipe 72 flows through the gas distribution hood 71 and then exits through the guide pipe 74. The gas outlet is through the center, and the gas guide pipe 74 is connected to the furnace door 6. The guide plate 73 inside the gas distribution hood 71 allows the airflow to travel in an S-shape within the gas distribution hood 71, thereby extending the airflow passage time. When the main furnace 1 is annealed, the inert gas will be preheated by the furnace temperature of the main furnace 1 when it flows through the gas distribution hood 71, so that the airflow entering the furnace door 6 and sprayed into the furnace cavity 2 is heated. This allows the preheated gas to directly participate in the furnace heat circulation without the need for secondary heating in the furnace, thereby improving the furnace heating efficiency and shortening the annealing cycle of the casting.

[0029] The furnace door 6 includes a fixed door plate 61 that is fixedly connected to the lifting door frame 5. The inner side of the fixed door plate 61 is provided with a door cavity 62. An air inlet valve 63 is connected to the middle of one side of the door cavity 62. The air guide pipe 74 is connected to the door cavity 62 through the air inlet valve 63. The air inlet valve 63 is a one-way valve. The inert gas passing through the air guide pipe 74 will enter the door cavity 62 in one direction through the air inlet valve 63.

[0030] A movable door panel 64 is slidably disposed on one side of the fixed door panel 61, and a sliding plate 65 is fixed to one end of the movable door panel 64. The movable door panel 64 is slidably connected to the inner door cavity 62 through the sliding plate 65, and the sliding plate 65 is tightly fitted to the inner door cavity 62 to prevent leakage of the inert gas filled into the inner door cavity 62. A sliding post 66 is fixed at the top and bottom of one side of the surface of the movable door panel 64, and the sliding post 66 is slidably sealed to the fixed door panel 61. A support spring 67 is disposed at the middle of the outer side of the sliding post 66, and the two ends of the support spring 67 are... Do not fix the movable door panel 64 and the fixed door panel 61. As inert gas is continuously introduced into the inner cavity 62, the sliding plate 65 and the movable door panel 64 will be pushed and moved under the action of air pressure. This will cause the movable door panel 64 to stretch the support spring 67 and move laterally out of the fixed door panel 61. Then, when the fixed door panel 61 and the movable door panel 64 are moved down to the front side of the inlet of the main furnace 1 by the hydraulic cylinder 4, the movable door panel 64 will be moved laterally. This will allow the movable door panel 64, which moves down first and then laterally, to complete the sealing of the inlet of the main furnace 1. After sealing, annealing treatment will be performed.

[0031] At this point, the movable door panel 64, which moves downwards and then laterally, can directly move up and down against the main furnace 1. This avoids the problem of wear and tear leading to seal failure over time. This ensures the long-term stability and safety of the main furnace 1 and prevents heat and harmful gas leakage during annealing. At the same time, the lateral movement of the movable door panel 64 is driven directly by the inert protective gas introduced through the gas pipe 74, eliminating the need for additional hydraulic or electric push rods and other drive mechanisms, thus saving energy and cost of drive components. In addition, the inert protective gas introduced into the inner cavity 62, after preheating, can insulate the fixed door panel 61 and the movable door panel 64, reducing the temperature difference between the inside and outside of the door panels, thereby reducing thermal stress and reducing the problem of deformation of the sealing surface due to large temperature differences between the inside and outside of the fixed door panel 61 and the movable door panel 64, which could lead to seal failure.

[0032] To address the technical problem of impurities and particles generated by friction during prolonged opening and closing at the sealing interface, which accumulate on the bonding surface, affecting the sealing effect, accelerating wear, and ultimately leading to seal failure and impacting the annealing process, the following measures are proposed. Figures 1-5 as well as Figure 8 As shown, the following preferred technical solutions are provided: The absorption mechanism 8 includes a suction box 81 fixed to the surface of the fixed door panel 61, and a piston plate 82 is slidably disposed inside the suction box 81. The piston plate 82 and the suction box 81 are slidably sealed together. One side of the piston plate 82 is fixedly connected to one end of the sliding column 66. When the moving door panel 64 moves the sliding column 66 due to the horizontal movement of air pressure, the sliding column 66 can synchronously drive the piston plate 82 to move to the right side of the suction box 81.

[0033] A one-way valve 83 is fixedly connected to the upper side of the suction box 81, and an exhaust valve 84 is fixedly connected to the lower side of the suction box 81. A collection box 85 is connected above the one-way valve 83. The one-way valve 83 is a valve body for introducing air into the suction box 81, while the exhaust valve 84 is a valve body for one-way exhaust from the suction box 81. When the piston plate 82 moves to the right side of the suction box 81, the gas in the right space of the suction box 81 will be discharged to the outside through the exhaust valve 84.

[0034] The collection box 85 is equipped with a dust filter plate 86, and a flow pipe 87 is connected to the top of the collection box 85. A gas distribution pipe 88 is connected to the front of the flow pipe 87, and an absorption port 89 is installed on the surface of the gas distribution pipe 88. After passing through the fixed door plate 61 and the movable door plate 64, the flow pipe 87 sets the gas distribution pipe 88 and the absorption port 89 on the outer periphery of the surface of the movable door plate 64, and the absorption port 89 extends out of the surface of the movable door plate 64. The flow pipe 87 is a high-temperature resistant, expandable flexible hose, so that the flow pipe 87 will not interfere with the movement of the movable door plate 64. When the casting is annealed, it is necessary to move the movable door plate 64 in the opposite direction to separate it from the main furnace 1. The gas in the gas inlet pipe 72 is stopped. Then, the pressure relief valve 20, which is a solenoid valve, is opened by the controller outside the furnace body. The controller is a device based on existing principles, and its specific principle will not be elaborated in this case. This allows the gas filled in the inner cavity 62 of the door to be depressurized and discharged. At this time, the pressure on the movable door plate 64 disappears, and it moves in the opposite direction under the rebound action of the support spring 67.

[0035] When the movable door panel 64 moves in the reverse direction, the piston plate 82 moves to the left side of the suction box 81 under the action of the sliding column 66. This allows the piston plate 82 to perform a one-way suction action using the one-way valve 83. When the one-way valve 83 draws air into the suction box 81, the airflow is drawn into the collection box 85 through the absorption port 89 via the flow pipe 87 and the air distribution pipe 88. When the movable door panel 64 moves in the reverse direction and separates from the main furnace 1, it draws air from the contact point between the movable door panel 64 and the main furnace 1 through the absorption port 89. This allows the absorption of particles generated by friction at the contact point, as well as any impurities that may be attached. After absorption, the dust filter plate 86 filters the particles into the collection box 85, allowing the airflow to enter the right side space of the suction box 81. This absorption of particulate impurities prevents them from adhering and accumulating on the bonding surface, thus avoiding problems such as affecting the sealing effect and accelerating wear. This ensures the cleanliness of the sealing bonding area and guarantees the stability and safety of long-term use during annealing. At the same time, the absorption port 89 absorbs impurity particles instead of blowing them off directly, which avoids the problem of secondary contamination of the bonding surface by impurity particles and also avoids the problem of impurity particles contaminating the surface of the annealed casting. An exhaust port 810 is opened on one side of the suction box 81. When suction and exhaust are performed in the right space of the suction box 81, the exhaust port 810 can be used to perform suction and exhaust in the left space of the suction box 81, thereby balancing the movement resistance of the piston plate 82 in the suction box 81.

[0036] To address the technical problem of external air seeping into the furnace through gaps, causing leakage of the inert protective gas and affecting the effectiveness of annealing, such as... Figures 1-7 As shown, the following preferred technical solutions are provided: The exhaust mechanism 9 includes an exhaust duct 91 formed on the surface of the movable door panel 64. A rotating valve 92 is installed on one side of the exhaust duct 91. A spring 93 is fixed above one side of the rotating valve 92, and the rotating valve 92 is elastically connected to the movable door panel 64 through the spring 93. A limit block 94 is provided on the lower side of the rotating valve 92, and the limit block 94 is fixedly connected to the movable door panel 64. An exhaust port 95 is provided on the front side of the exhaust duct 91. Inert gas introduced through the intake pipe 72 fills the inner cavity 62 of the door, causing the movable door panel 64 to move laterally and fit against the main furnace 1. As the gas pressure increases, the exhaust port 95 is opened. As the air pressure increases, it pushes open the rotating valve disc 92 and compresses the spring 93. When the moving door plate 64 moves under the air pressure, the elastic force of the spring 93 keeps the rotating valve disc 92 closed. After the moving door plate 64 moves into place, as the airflow continues to flow in, the air pressure pushes open the rotating valve disc 92 and compresses the spring 93, opening the vent 91. This allows the airflow to be sprayed from the jet nozzle 95 into the furnace chamber 2 to replace the oxygen in the furnace chamber 2. This jetting from the moving door plate 64 into the furnace chamber 2 can form a directional airflow, breaking the static state of the gas in the furnace and promoting the rapid and uniform mixing of the inert protective gas.

[0037] The air-sealing mechanism 10 includes a second ventilation channel 101 formed on the surface of the movable door panel 64. A second rotating valve disc 102 is installed on one side of the interior of the second ventilation channel 101. A second spring 103 is fixed above one side of the second rotating valve disc 102, and the second rotating valve disc 102 is elastically connected to the movable door panel 64 through the second spring 103.

[0038] A limit block 104 is provided on one side below the rotating valve disc 102, and the limit block 104 is fixedly connected to the movable door plate 64. An outlet 105 is fixedly connected to the front side of the ventilation channel 101. A gas collecting groove 106 is provided on the upper side of the outlet 105 and is located on the surface of the main furnace 1. As the gas pressure entering the inner cavity 62 continuously increases, the gas pressure will push open the rotating valve disc 92. At the same time, the gas pressure will also push open the rotating valve disc 102 and compress the spring 103. When the movable door plate 64 is moved by the gas pressure, the elastic force of the spring 103 causes the rotating valve to rotate. With valve 102 in a closed state, after the movable door 64 moves into place, as airflow continues to enter, the air pressure will push the rotary valve 102 open and compress the spring 103, allowing the ventilation channel 101 to open. This allows airflow to be ejected from the outlet 105, which faces the gas collecting groove 106. This allows the incoming protective gas to form an air curtain at the gas collecting groove 106, preventing external air from seeping in through the gaps. Combined with the tight seal of the movable door 64, this effectively reduces the possibility of leakage of protective gas inside the furnace, thereby ensuring the effectiveness of the annealing treatment of high-precision wear-resistant castings.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] 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 annealing furnace for heat treatment of wear-resistant castings, comprising a main furnace (1) and a furnace cavity (2) disposed inside the main furnace (1), characterized in that: The bottom of the main furnace (1) is provided with a trolley slide rail (30), and the upper surface of the trolley slide rail (30) is provided with a feeding trolley (40). A limit slide groove (50) is opened below the surface of the furnace cavity (2). A fixed frame (3) is fixed to the outside of the main furnace (1), and hydraulic cylinders (4) are fixed on both sides above the main furnace (1). A lifting door frame (5) is slidably installed inside the fixed frame (3), and a furnace door (6) is fixed in the middle of the lifting door frame (5). An air intake mechanism (7) is connected above the main furnace (1). The air intake mechanism (7) is connected to the furnace door (6) and the furnace cavity (2). An absorption mechanism (8) is provided at one end of the furnace door (6), and a pressure relief valve (20) is connected to one side surface of the furnace door (6). An air outlet mechanism (9) is provided on the other side surface of the furnace door (6), and an air sealing mechanism (10) is provided around the surface of the furnace door (6).

2. The annealing furnace for heat treatment of wear-resistant castings according to claim 1, characterized in that: The air intake mechanism (7) includes an air distribution hood (71) fixed in the inner wall above the main furnace (1), and an air intake pipe (72) is connected to one side of the air distribution hood (71). A guide plate (73) is fixed to the inner side of the air distribution hood (71), and an air guide pipe (74) is connected to the upper side of the other side of the air distribution hood (71).

3. An annealing furnace for heat treatment of wear-resistant castings according to claim 2, characterized in that: The furnace door (6) includes a fixed door plate (61) fixedly connected to the lifting door frame (5), and an inner cavity (62) is provided on the inner side of the fixed door plate (61). An air inlet valve (63) is connected to the middle of one side of the inner cavity (62), and an air guide pipe (74) is connected to the inner cavity (62) through the air inlet valve (63).

4. An annealing furnace for heat treatment of wear-resistant castings according to claim 3, characterized in that: A movable door panel (64) is slidably disposed on one side of the fixed door panel (61), and a sliding plate (65) is fixed at one end of the movable door panel (64). The movable door panel (64) is slidably connected to the inner cavity (62) of the door through the sliding plate (65), and the sliding plate (65) is tightly fitted to the inner cavity (62). A sliding column (66) is fixed above and below one side of the surface of the movable door panel (64), and the sliding column (66) is slidably sealed to the fixed door panel (61). A support spring (67) is disposed in the middle of the outer side of the sliding column (66), and the two ends of the support spring (67) are fixed to the movable door panel (64) and the fixed door panel (61) respectively.

5. An annealing furnace for heat treatment of wear-resistant castings according to claim 4, characterized in that: The absorption mechanism (8) includes a suction box (81) fixed on the surface of the fixed door panel (61), and a piston plate (82) is slidably arranged inside the suction box (81), and the piston plate (82) and the suction box (81) are slidably sealed together. One side of the piston plate (82) is fixedly connected to one end of the sliding column (66).

6. An annealing furnace for heat treatment of wear-resistant castings according to claim 5, characterized in that: A one-way valve (83) is fixedly connected to the upper side of the suction box (81), and an exhaust valve (84) is fixedly connected to the lower side of the suction box (81). A collection box (85) is connected to the upper side of the one-way valve (83).

7. An annealing furnace for heat treatment of wear-resistant castings according to claim 6, characterized in that: The collection box (85) is equipped with a dust filter plate (86) inside, and a flow pipe (87) is connected to the top of the collection box (85). An air distribution pipe (88) is connected to the front side of the flow pipe (87), and an absorption port (89) is installed on the surface of the air distribution pipe (88). An exhaust port (810) is opened on one side surface of the suction box (81).

8. An annealing furnace for heat treatment of wear-resistant castings according to claim 4, characterized in that: The air outlet mechanism (9) includes an air passage (91) opened on the surface of the movable door panel (64), and a rotating valve (92) is installed on one side of the interior of the air passage (91). A spring (93) is fixed above one side of the rotating valve (92), and the rotating valve (92) is elastically connected to the movable door panel (64) through the spring (93). A limit block (94) is provided on the lower side of the rotating valve (92), and the limit block (94) is fixedly connected to the movable door panel (64). An air jet (95) is opened on the front side of the air passage (91).

9. An annealing furnace for heat treatment of wear-resistant castings according to claim 4, characterized in that: The air-sealing mechanism (10) includes a second ventilation channel (101) opened on the surface of the movable door panel (64). A second rotating valve disc (102) is installed on one side of the inner side of the second ventilation channel (101). A second spring (103) is fixed above one side of the second rotating valve disc (102), and the second rotating valve disc (102) is elastically connected to the movable door panel (64) through the second spring (103).

10. An annealing furnace for heat treatment of wear-resistant castings according to claim 9, characterized in that: A limiting block (104) is provided on one side below the rotating valve disc (102), and the limiting block (104) is fixedly connected to the movable door panel (64). An air outlet (105) is fixedly connected to the front side of the ventilation channel (101). An air collection groove (106) is provided on the upper side of the air outlet (105), and the air collection groove (106) is provided on the surface of the main furnace (1).

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