A method for using a double-layer annealing device inside and outside a valve body

Abstract

The present invention discloses a method for using a double-layer annealing device inside and outside a valve body, and relates to the technical field of annealing devices. The present invention adopts an inside-outside double-layer annealing method, which is specifically manifested as: using a built-in heating plate as an outer layer heat source, and using an air flow heated by a heating box as an inner layer heat source, and further limiting the temperature values ​​of the outer layer heat source and the inner layer heat source to ensure that the annealing effect of the inner layer of the valve body is within the normal production requirement range, and reducing the annealing effect of the outer layer of the valve body, which is mainly reflected in: according to the principle of heat conduction, the inner layer position of the valve body is used as the main heating position, so that the overall annealing device is mainly aimed at the inner layer of the valve body, and a temperature rise formula related to temperature and action time is established to reversely control the heat source temperature or annealing action time in the overall process, to ensure that the overall annealing process proceeds normally, and the annealing effect of the outer layer of the valve body is minimized.

Description

Technical Field

[0001] The invention relates to the technical field of annealing devices, and in particular to a method for using a double-layer annealing device inside and outside a valve body. Background Art

[0002] Annealing is a metal heat treatment process, which means slowly heating the metal to a certain temperature, keeping it for a sufficient time, and then cooling it at an appropriate speed. The purpose is to reduce the hardness and improve the machinability. More precisely, annealing is a heat treatment process for materials, including metal materials and non-metallic materials. It is one of the means of thermal aging treatment. Here it is the annealing process for the valve body.

[0003] The essence of the valve body is a metal part of the corresponding material, but its structure is different from that of conventional metal parts: it belongs to a pipe-level semi-enclosed (fully enclosed) structure, its inner wall is a working surface, and the outer wall is a non-working surface. In the conventional annealing method, the substrate is directly placed in a structure such as an annealing furnace, and a constant temperature is used, which leads to relatively consistent annealing effects on the inner and outer walls of the valve body. For the actual requirements of the valve body annealing process, the main focus is on the inner wall, so that the inner wall meets the subsequent processing requirements (releasing stress, increasing material ductility and toughness, producing changes in physical properties such as special microstructures), and the outer wall is maintained as original as possible or the annealing effect is not obvious. Therefore, when the valve body structure adopts conventional annealing methods, the physical properties of the outer and inner walls will change. Conversely, changes in the physical properties of the outer wall of the valve body will have an adverse effect on the overall structure, such as reducing the structural strength of the overall valve body.

[0004] In view of the above technical problems, this application proposes a solution. Summary of the invention

[0005] The purpose of the present invention is to provide a method for using a double-layer annealing device inside and outside the valve body, which is used to solve the problem that the physical properties of the inner and outer walls of the valve body will change during the annealing process, and the change in the physical properties of the outer wall will have an adverse effect on the overall structure.

[0006] The object of the present invention can be achieved by the following technical scheme: A method for using a double-layer annealing device inside and outside a valve body includes an annealing furnace body and an external circulation pipeline assembly, wherein the annealing furnace body includes a bottom support, a left frame and a right frame, and the external circulation pipeline assembly includes a heating box, a branch joint pipe, a suction pump, a return pipe, an inlet pipe and two connecting air plates;

[0007] The left side frame and the right side frame are located on the upper surface of the bottom bracket, and the lower sides of the left side frame and the right side frame are rotatably connected to the bottom bracket. The connecting air plate is arranged at the end of the branch joint pipe. The input end of the suction pump is connected to the branch joint pipe, and the output end of the suction pump is connected to one end of the return pipe. The other end of the return pipe and one end of the inlet pipe are connected to the input end and the output end of the heating box.

[0008] Built-in heating plates are installed on the inner walls of the left and right frames, a valve body is arranged inside the annealing furnace body, the connecting air plate, the inlet pipe and the opening position of the valve body are matched, an upper wind hood and a servo motor are installed at the center point of the upper surface of the right frame, the installation direction of the upper wind hood is parallel to the length direction of the right frame, and the cross-section of the upper wind hood is in an inverted arc shape, and the lower end of the upper wind hood is connected to the inside of the annealing furnace body.

[0009] It is further configured that: the inlet pipe passes through the interior of the bottom support, a placement groove is opened on the upper surface of the bottom support, the other end of the inlet pipe is located in the placement groove, and the center point of the other end of the inlet pipe and the center point of the placement groove are on the same vertical axis.

[0010] It is further configured that: two vertically arranged support ring frames are installed on the upper surface of the bottom support platform along the layout position of the valve body.

[0011] It is further configured as follows: a wind cavity is opened in the upper end position inside the upper wind cover, a turbofan rod is rotatably mounted on the inner wall of the wind cavity, a transmission rod of the servo motor passes through the upper wind cover, and the transmission rod of the servo motor is connected to the turbofan rod.

[0012] It is further configured as follows: the connecting air plate is disc-shaped, connecting air ports corresponding to the connecting air plates are opened on the outer walls of the left frame and the right frame, and the connecting air plates are threadedly connected to the left frame and the right frame through the connecting air ports.

[0013] The external circulation pipeline assembly is provided with a controller, and the controller is provided with a temperature automatic control system. The inner and outer double-layer annealing device is established by the temperature automatic control system, and the following operating steps are set:

[0014] Step 1: Heating stage: Place the valve body to be annealed in the annealing furnace body, connect the connecting air plate in the external circulation pipe assembly to the connecting air port on the annealing furnace body, start the heating box, suction pump and built-in heating plate simultaneously, the built-in heating plate provides heat to the inside of the annealing furnace body, the suction pump sucks the air inside the annealing furnace body, and the air inside the valve body flows out along the branch joint pipe - the air enters the heating box along the return pipe to heat the air - the heated air enters the inside of the valve body along the inlet pipe;

[0015] Step 2: Backflow stage: In step 1, the servo motor is started synchronously, and the turbofan rod rotates at a constant speed to generate wind force along the cross-sectional profile curve direction of the upper wind cover, driving the high-temperature air at the upper end of the annealing furnace body to backflow;

[0016] Step 3: Control stage: In step 1, the ideal annealing temperature of the valve body is preset through the temperature automatic control system, and the first stage heating temperature of the built-in heating plate and the second stage heating temperature of the heating box are recorded, and the temperature rise formula is established through the temperature automatic control system, and the ideal annealing temperature is used as the follow-up reference of the temperature rise formula, wherein the numerical value of the first stage heating temperature is smaller than the numerical value of the second stage heating temperature, and the numerical value of the second stage heating temperature is smaller than the ideal annealing temperature, and the total value of the first stage heating temperature, the second stage heating temperature and the annealing action time are used as the dynamic variable value in the temperature rise formula, and according to the difference between the calculated value in the temperature rise formula and the ideal annealing temperature, the numerical values ​​of the first stage heating temperature and the second stage heating temperature are reversely controlled, or the annealing action time is reversely adjusted.

[0017] The present invention has the following beneficial effects:

[0018] 1. The present invention forms an inner and outer double-layer annealing method for the overall structure of the valve body, which is specifically manifested as: using the built-in heating plate as the heat source inside the overall annealing furnace body, and using the air heated by the heating box as the inner layer heat source. Both heat sources generate heat energy for the valve body. It should be noted that the inner layer heat source is mainly for the internal part of the valve body. In order to ensure the normal progress of the overall annealing process, the following conditions are restricted: the numerical value of the first stage heating temperature is less than the numerical value of the second stage heating temperature, and the numerical value of the second stage heating temperature is less than the ideal annealing temperature. The purpose is to minimize the annealing effect on the outer layer of the valve body and ensure the normal annealing effect of the inner layer of the valve body.

[0019] 2. In combination with the above contents, the heat conduction principle is utilized, the difference between the first stage heating temperature and the second stage heating temperature is combined, and the temperature rise formula correlating the temperature with the action time is established by using the controller. It is mainly reflected in: the total value of the first stage heating temperature, the second stage heating temperature and the annealing action time is used as the dynamic variable value in the temperature rise formula, and the calculated value is compared with the ideal annealing temperature, so that the heat source temperature or the annealing action time in the overall annealing process can be reversely controlled. The ultimate goal is to ensure that the inner layer of the valve body can receive the annealing effect under normal conditions, while reducing the annealing effect on the outer layer of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic structural diagram of a double-layer annealing device for the inner and outer sides of a valve body proposed by the present invention;

[0022] Figure 2 This is a schematic structural diagram of an external circulation pipeline assembly in a double-layer annealing device inside and outside a valve body proposed by the present invention;

[0023] Figure 3 This is a schematic structural diagram of an annealing furnace body in a double-layer annealing device for inner and outer valve bodies proposed by the present invention;

[0024] Figure 4 The present invention provides a double-layer annealing device for the inner and outer sides of a valve body. Figure 3 The expanded diagram of

[0025] Figure 5 A cross-sectional view of the right frame component of a double-layer annealing device for the inner and outer parts of a valve body proposed by the present invention;

[0026] Figure 6 This is a cross-sectional view of a bottom support component in a double-layer annealing device for the inner and outer parts of a valve body proposed by the present invention.

[0027] In the figure: 1. bottom support platform; 2. right side frame; 3. branch joint pipe; 4. suction pump; 5. return pipe; 6. servo motor; 7. upper wind cover; 8. placement slot; 9. left side frame; 10. connecting wind plate; 11. controller; 12. heating box; 13. inlet pipe; 14. connecting air outlet; 15. support ring frame; 16. built-in heating plate; 17. turbo fan rod. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1

[0030] For the valve body, a semi-enclosed (fully-enclosed) structure at the pipe level, the annealing process is mainly aimed at its internal position. In the conventional annealing process, because a constant temperature is used, the annealing effects of the inner and outer walls of the valve body are relatively consistent, and the physical properties of the outer and inner walls will change. Conversely, the change in the physical properties of the outer wall of the valve body will have an adverse effect on the overall structure, such as reducing the structural strength of the overall valve body. For this reason, the following technical solutions are proposed:

[0031] Reference Figures 1 to 6 In this embodiment, a method for using a double-layer annealing device inside and outside a valve body includes an annealing furnace body and an external circulation pipeline assembly, wherein the annealing furnace body includes a bottom support 1, a left frame 9 and a right frame 2, and the external circulation pipeline assembly includes a heating box 12, a branch joint pipe 3, a suction pump 4, a return pipe 5, an inlet pipe 13 and two connecting air plates 10;

[0032] The left side frame 9 and the right side frame 2 are located on the upper surface of the bottom bracket 1, and the lower sides of the left side frame 9 and the right side frame 2 are rotatably connected to the bottom bracket 1. The connecting wind plate 10 is arranged at the end of the branch joint pipe 3. The input end of the suction pump 4 is connected to the branch joint pipe 3, and the output end of the suction pump 4 is connected to one end of the return pipe 5. The other end of the return pipe 5 and one end of the inlet pipe 13 are connected to the input end and the output end of the heating box 12.

[0033] Built-in heating plates 16 are installed on the inner walls of the left frame 9 and the right frame 2. A valve body is arranged inside the annealing furnace body. The connecting air plate 10 and the inlet pipe 13 match the opening position of the valve body. An upper wind hood 7 and a servo motor 6 are installed at the center point of the upper surface of the right frame 2. The installation direction of the upper wind hood 7 is parallel to the length direction of the right frame 2, and the cross-section of the upper wind hood 7 is in an inverted arc shape. The lower end of the upper wind hood 7 is connected to the inside of the annealing furnace body.

[0034] The inlet pipe 13 passes through the interior of the bottom support 1, and a placement groove 8 is opened on the upper surface of the bottom support 1. The other end of the inlet pipe 13 is located in the placement groove 8, and the center point of the other end of the inlet pipe 13 and the center point of the placement groove 8 are on the same vertical axis. Two vertically arranged support ring frames 15 are installed on the upper surface of the bottom support 1 along the layout position of the valve body.

[0035] Operation principle: The annealing technology in the overall device is consistent with the current annealing method, which mainly uses the change in temperature to cause the physical properties of the valve body to change, but the specific operations are different as follows:

[0036] S1: Open the left frame 9 and the right frame 2, place the valve body to be annealed in the bottom support 1, close the left frame 9 and the right frame 2, and then connect the external circulation pipeline assembly;

[0037] S2: During the specific operation, the built-in heating plate 16 provides an outer heat source, and the heat energy generated is mainly directed to the outer position of the valve body. When the heating box 12 and the suction pump 4 are started, the suction pump 4 drives the air inside the valve body to circulate continuously. The air passes through the heating process of the heating box 12 during the circulation process, so that the heat energy generated by the heating box 12 acts on the inner position of the valve body, thereby forming an inner heat source;

[0038] S3: Combining S1 and S2, during the overall annealing process, only the inner layer heat source is used as the main annealing temperature, and there is no need to use a constant temperature for annealing, thereby avoiding consistent changes in physical properties of the outer and inner layers of the valve body.

[0039] Embodiment 2

[0040] This embodiment combines the operating principle of the first embodiment to make the following optimization and improvement process:

[0041] An air cavity is opened in the upper end position inside the upper wind cover 7, and a turbofan rod 17 is rotatably installed on the inner wall of the air cavity. The transmission rod of the servo motor 6 passes through the upper wind cover 7, and the transmission rod of the servo motor 6 is connected to the turbofan rod 17. The connecting wind plate 10 is disc-shaped, and connecting air ports 14 corresponding to the connecting air plates 10 are opened on the outer walls of the left frame 9 and the right frame 2. The connecting wind plate 10 is threadedly connected to the left frame 9 and the right frame 2 through the connecting air ports 14.

[0042] Technical advantages: As in the first embodiment, in the process of providing the outer heat source with the built-in heating plate 16, because the entire annealing furnace body is a relatively sealed closed space, according to the thermal energy principle in thermodynamics, the high-temperature gas will slowly float to the upper end of the annealing furnace body, thereby causing a temperature difference along the height direction inside, which will also affect the overall annealing effect. It should be noted that: refer to Figure 3 and Figure 5 During the annealing operation, when the turbofan rod 17 rotates continuously at a constant speed, an airflow matching the contour curve of the upper wind shield 7 is generated, the purpose of which is to promote the continuous circulation of the high-temperature airflow "accumulated" in the upper position of the annealing furnace body, and avoid a greater temperature difference caused by the "accumulation" of high-temperature gas;

[0043] Combination Figure 1 and Figure 4 For example, the left side frame 9 and the right side frame 2 can be unfolded in the opposite direction. In the closing process, it is necessary to ensure that the left side frame 9 and the right side frame 2 can "clamp" the valve body. Figure 3As shown, during the closing process of the left side frame 9 and the right side frame 2, the left side frame 9 and the right side frame 2 just "clamp" the two ends of the valve body, so that the connecting air plate 10 and the branch joint pipe 3 just correspond to the opening position of the valve body, and further limit the connection method between the connecting air outlet 14 and the connecting air plate 10 to a threaded connection, which not only ensures that the connecting air outlet 14 and the connecting air plate 10 can be just connected, but also promotes the closing process of the left side frame 9 and the right side frame 2.

[0044] Embodiment 3

[0045] This embodiment is a key part of the present invention. Based on the technical content of the first embodiment, the following control method is made:

[0046] The external circulation pipeline assembly is provided with a controller 11, and the controller 11 is provided with a temperature automatic control system. The inner and outer double-layer annealing device is established through the temperature automatic control system, and the following operating steps are set:

[0047] Step 1: Heating stage: place the valve body to be annealed in the annealing furnace body, connect the connecting air plate 10 in the external circulation pipe assembly to the connecting air port 14 on the annealing furnace body, start the heating box 12, the suction pump 4 and the built-in heating plate 16 simultaneously, the built-in heating plate 16 provides heat to the inside of the annealing furnace body, the suction pump 4 sucks the air inside the annealing furnace body, and the air inside the valve body flows out along the branch joint pipe 3 - the air enters the heating box 12 along the return pipe 5 to heat the air - the heated air enters the inside of the valve body along the inlet pipe 13;

[0048] Step 2: Backflow stage: In step 1, the servo motor 6 is started synchronously, and the turbofan rod 17 rotates at a constant speed to generate wind force along the cross-sectional contour curve direction of the upper wind cover 7, driving the high-temperature air at the upper end of the annealing furnace body to backflow;

[0049] Step 3: Control stage: In step 1, the ideal annealing temperature of the valve body is preset through the temperature automatic control system, and the first stage heating temperature of the built-in heating plate 16 and the second stage heating temperature of the heating box 12 are recorded, and the temperature rise formula is established through the temperature automatic control system, with the ideal annealing temperature as the follow-up reference of the temperature rise formula, and the total value of the first stage heating temperature, the second stage heating temperature and the annealing action time is used as the dynamic variable value in the temperature rise formula, wherein the value of the first stage heating temperature is less than the value of the second stage heating temperature, and the value of the second stage heating temperature is less than the ideal annealing temperature. According to the difference between the calculated value in the temperature rise formula and the ideal annealing temperature, the values ​​of the first stage heating temperature and the second stage heating temperature are reversely controlled, or the annealing action time is reversely adjusted.

[0050] Technical advantages:

[0051] 1) It should be noted that: the valve body used in this embodiment adopts a traditional three-head structure, and the branch joint pipe 3 and the inlet pipe 13 are arranged on the side to match the three-head position in the valve body. If other structures are adopted, the external circulation pipeline assembly can be improved and optimized. In this embodiment, there are not many restrictions. The main explanation is: maintain the airflow circulation direction of the external circulation pipeline assembly, such as the air inside the valve body flows out along the branch joint pipe 3-the air enters the heating box 12 along the return pipe 5-the heated air enters the inside of the valve body along the inlet pipe 13;

[0052] 2) As for the first stage heating temperature, the second stage heating temperature and the total value of the annealing action time, the purpose of setting the built-in heating plate 16 is to provide an external "protection source" for the overall annealing action. According to the operating principle improved in the first embodiment, if the overall annealing process only provides the inner layer heating source, the annealing effects of the inner and outer layers of the valve body will be quite different, and according to the heat conduction principle, when the heat energy generated by the inner layer heating source acts on the valve body, a large part of the heat energy needs to be "transferred" to the outer layer of the valve body, which will have an adverse effect on the overall annealing process, such as: the annealing cycle is extended, and even when the annealing temperature is too high, because the actual temperature of the inner and outer layers of the valve body is quite different, the physical properties of the inner and outer layers of the valve body will change uncontrollably;

[0053] 3) Combining 1) and 2), the temperature rise formula is the key content, specifically: the ideal annealing temperature is set to T o , its T o According to the material of different valve bodies and actual production process requirements, it is not limited in this embodiment, and the first stage heating temperature and the second stage heating temperature are respectively set as: T a and T b , and T a <T b , and the temperature rise formula established is: T 内 =t*T b *k, Where t is the total annealing action time, k is the conversion factor in the temperature rise formula, and 0.73 is the converted stator. It should be noted here that: according to the heat transfer efficiency of the valve body material, when T is provided a or T b When the heat energy is transferred, the heat energy heats the valve body. In addition, during the heat energy transfer process, the high temperature will transfer to the low temperature area, because T a <T b , so the temperature of the inner layer of the valve body is higher and the temperature of the outer layer is lower, so the temperature of the inner layer will be transferred to the outer layer, so T 内 is the actual temperature value of the inner layer of the valve body, T 外 is the actual temperature value of the inner layer of the valve body. Obviously, T外 T 内 The effect of T a When the outer layer of the valve body is heated, it will also "receive" T 内 The temperature changes;

[0054] Combined with 3), for the overall annealing process, first of all, T o ≤T 内 To ensure that the temperature generated during the overall heating process is sufficient to support the annealing action, but it is necessary to ensure that the temperature of the outer layer of the valve body is not too high. For this, the temperature automatic control system is used to define the protection temperature T again. i , it is necessary to ensure T i ≥T 外 It should be noted that it takes a certain amount of time for the temperature generated inside the valve body to be transferred to the external position. This time period belongs to the total value of the overall annealing action time. Therefore, in order to ensure T o ≤T 内 Under this premise, the total annealing time can be shortened and T a Or increase T b etc., to maintain the above T o ≤T 内 、T i ≥T 外 .

[0055] In summary: the inner and outer double-layer annealing method is adopted, which is specifically manifested as: the built-in heating plate is used as the outer heat source, and the air flow heated by the heating box is used as the inner heat source, and the temperature values ​​of the outer and inner heat sources are further limited to ensure that the annealing effect of the inner layer of the valve body is within the normal production requirement range, and the annealing effect of the outer layer of the valve body is reduced. It is mainly reflected in: according to the principle of heat conduction, the inner layer of the valve body is used as the main heating position, so that the overall annealing device is mainly aimed at the inner layer of the valve body, and a temperature rise formula related to the temperature and the action time is established to reversely control the heat source temperature or the annealing action time in the overall process, to ensure that the overall annealing process proceeds normally, and the annealing effect of the outer layer of the valve body is minimized.

[0056] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for using a double-layer annealing device inside and outside a valve body, characterized in that: A double-layer annealing device inside and outside the valve body is used, and the double-layer annealing device inside and outside the valve body comprises an annealing furnace body and an external circulation pipeline component, the annealing furnace body comprises a bottom support platform (1), a left side frame (9) and a right side frame (2), and the external circulation pipeline component comprises a heating box (12), a branch joint pipe (3), a suction pump (4), a return pipe (5), an inlet pipe (13) and two connecting air plates (10); The left side frame (9) and the right side frame (2) are located on the upper surface of the bottom support platform (1), and the lower sides of the left side frame (9) and the right side frame (2) are rotatably connected to the bottom support platform (1). The connecting air plate (10) is arranged at the end of the branch joint pipe (3). The input end of the suction pump (4) is connected to the branch joint pipe (3), and the output end of the suction pump (4) is connected to one end of the return pipe (5). The other end of the return pipe (5) and one end of the inlet pipe (13) are connected to the input end and the output end of the heating box (12). Built-in heating plates (16) are installed on the inner walls of the left side frame (9) and the right side frame (2); a valve body is arranged inside the annealing furnace body; the connecting air plate (10) and the inlet pipe (13) match the opening position of the valve body; an upper air cover (7) and a servo motor (6) are installed at the center point of the upper surface of the right side frame (2); the installation direction of the upper air cover (7) is parallel to the length direction of the right side frame (2); the cross section of the upper air cover (7) is in the shape of an inverted arc; the lower end of the upper air cover (7) is connected to the inside of the annealing furnace body; the connecting air plate (10) is in the shape of a disc; connecting air ports (14) corresponding to the connecting air plates (10) are provided on the outer walls of the left side frame (9) and the right side frame (2); the connecting air plates (10) are threadedly connected to the left side frame (9) and the right side frame (2) through the connecting air ports (14); The external circulation pipeline assembly is provided with a controller (11), and the controller (11) is provided with a temperature automatic control system. The inner and outer double-layer annealing device is established by the temperature automatic control system, and the following operating steps are set: Step 1: Heating stage: the valve body to be annealed is placed in the annealing furnace body, the connecting air plate (10) in the external circulation pipe assembly is connected to the connecting air port (14) on the annealing furnace body, and the heating box (12), the suction pump (4) and the built-in heating plate (16) are started simultaneously, the built-in heating plate (16) provides heat to the inside of the annealing furnace body, the suction pump (4) sucks the air inside the annealing furnace body, and the air inside the valve body flows out along the branch joint pipe (3) - the air enters the heating box (12) along the return pipe (5) to heat the air - the heated air enters the inside of the valve body along the inlet pipe (13); Step 2: Backflow stage: In step 1, the servo motor (6) is started synchronously, and the turbo fan rod (17) rotates at a constant speed to generate wind force along the cross-sectional profile curve direction of the upper wind cover (7), driving the high-temperature air at the upper end of the annealing furnace body to backflow; Step 3: Control stage: In step 1, the ideal annealing temperature of the valve body is preset by the temperature automatic control system, and the first stage heating temperature of the built-in heating plate (16) and the second stage heating temperature of the heating box (12) are recorded, and a temperature rise formula is established by the temperature automatic control system, with the ideal annealing temperature as the post-driving reference of the temperature rise formula, and the first stage heating temperature, the second stage heating temperature and the total value of the annealing action time are used as the dynamic variable values ​​in the temperature rise formula, wherein the value of the first stage heating temperature is smaller than the value of the second stage heating temperature, and the value of the second stage heating temperature is smaller than the ideal annealing temperature, and the total value of the annealing action time is used to indicate the time for the temperature generated inside the valve body to be transferred to the external position, and according to the difference between the calculated value in the temperature rise formula and the ideal annealing temperature, the values ​​of the first stage heating temperature and the second stage heating temperature are reversely controlled, or the annealing action time is reversely adjusted.

2. The method for using the double-layer annealing device for inner and outer valve body according to claim 1, characterized in that: The inlet pipe (13) passes through the interior of the bottom support platform (1), a placement groove (8) is provided on the upper surface of the bottom support platform (1), the other end of the inlet pipe (13) is located in the placement groove (8), and the center point of the other end of the inlet pipe (13) and the center point of the placement groove (8) are on the same vertical axis.

3. The method for using the double-layer annealing device for inner and outer valve body according to claim 1, characterized in that: Two vertically arranged support ring frames (15) are installed on the upper surface of the bottom support platform (1) along the layout position of the valve body.

4. The method for using the double-layer annealing device for inner and outer valve body according to claim 1, characterized in that: An air cavity is provided in the upper end of the upper wind cover (7), a turbofan rod (17) is rotatably mounted on the inner wall of the air cavity, a transmission rod of the servo motor (6) passes through the upper wind cover (7), and the transmission rod of the servo motor (6) is connected to the turbofan rod (17).

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