A natural gas forging furnace and processing technology for heat treatment of metal forgings

Abstract

The present application discloses a natural gas forging furnace and a processing technology for heat treatment of metal forgings. The locking bracket is pushed according to the high-pressure airflow in the locking chamber, thereby limiting the movement of the adjusting head and ensuring that the furnace door cannot be opened by external force when the furnace chamber is under high pressure. When the pressure in the furnace chamber is released according to the turning of the handle, the airflow will be output from the venting passage, and then the tightening fan blade is pushed to rotate and squeeze the opening and closing push spring, thereby ensuring that the furnace door can only be opened at normal pressure. At the same time, the opening strength of the furnace door is enhanced according to the compressed opening and closing push spring, thereby reducing the manual opening strength. At the same time, through the arrangement of the opening and closing push spring, the furnace door will be opened by the elastic force of the opening and closing push spring when it is not completely closed, thereby warning the operator through the opened furnace door that the furnace chamber is not completely sealed and normal heating work cannot be carried out. Finally, the effects of the furnace door being able to be opened normally only at normal pressure, the furnace door being locked during operation, the door opening strength being reduced, and the warning being issued when the furnace door is not completely closed are achieved.

Description

Technical Field

[0001] This application relates to the technical field of heating furnaces, and particularly relates to a natural gas forging furnace and processing technology for heat treatment of metal forgings. Background Technique

[0002] Natural gas is a clean energy source with advantages such as high calorific value, stable combustion, simple equipment, easy control, and low pollution. It has begun to be widely used in industrial kilns, industrial boilers, domestic boilers, motor vehicles, and other fields. Currently, natural gas is also used to heat forging furnaces.

[0003] When the current natural gas forging furnace body is used for heat treatment of metal forgings, since most furnace doors are opened and closed manually, and when combustion occurs in the furnace cavity, high temperature and high pressure will be generated. If the operator directly opens it, high-pressure air flow may be output outward, causing the operator to be scalded by the ejected high-pressure air flow when opening unexpectedly without pressure relief, resulting in certain safety hazards. And the existing furnace door locking methods are mostly rotational threaded types, and the furnace door is closed by tightening the thread, so the phenomenon of the furnace door not being tightly closed may occur during use, resulting in a large amount of heat loss and affecting the normal heating of metal forgings by the natural gas forging furnace. Summary of the Invention

[0004] This application proposes a natural gas forging furnace and processing technology for heat treatment of metal forgings, which has the advantages of being able to open the furnace door normally only under normal pressure, the furnace door being locked during operation, reducing the opening strength, and giving a warning when the furnace door is not fully closed, so as to solve the problems raised in the above background technique.

[0005] To achieve the above object, this application adopts the following technical solution: A natural gas forging furnace for heat treatment of metal forgings, including a furnace body: a furnace cavity is opened in the inner cavity of the furnace body, a furnace door is hinged on the side wall of the furnace body, a lifting rod is movably installed on the top of the furnace body, and a ball head movably connected to the furnace door is fixedly installed at one end of the lifting rod, an adjusting head is fixedly installed at the other end of the lifting rod, a locking plug is movably installed on the inner wall of the top of the furnace body above the furnace cavity, a locking cavity communicating with one side of the locking plug is opened on the inner wall of the top of the furnace body, a return spring is fixedly installed on the other side of the locking plug, and when the pressure in the furnace cavity increases, one end of the locking plug abuts against the adjusting head to limit the movement of the adjusting head, a pressure relief cavity is opened on the top of the furnace body, and a pressure relief device is provided on the furnace body to discharge the high-pressure air flow in the furnace cavity to the outside through the pressure relief cavity.

[0006] Further, the shape of the adjusting head is set as a combination of the bottoms of two frustum cones fitting together.

[0007] Further, the pressure relief device is set as an air flow valve, and the air flow valve is installed on the top of the furnace body and communicates with the pressure relief cavity.

[0008] Furthermore, the pressure relief device includes a partition block, a transmission rod, an opening and closing push spring, an adjusting disk and a handle. A partition block located on one side of the end of the adjusting head is slidably installed on the inner wall of the furnace body, and a transmission rod arranged coaxially with the adjusting head is movably installed in the middle of the partition block. An opening and closing push spring is movably installed on one side of the partition block. An adjusting disk coaxial with the transmission rod is movably installed on the inner wall of the furnace body. An air release channel is opened on the furnace body. A connection through hole is opened on the side wall of the adjusting disk. When the transmission rod pushes the adjusting disk, the adjusting disk is reset and the connection through hole is blocked by the inner wall of the furnace body to close the air release channel and the air release cavity. A rack is arranged at the end of the ball head. A handle is hinged on the surface of the furnace door, and one end of the handle meshes with the rack at the end of the ball head after the furnace door is closed.

[0009] Furthermore, the surface shape of the partition block is set to be oval. A guiding groove is opened on the side wall of the transmission rod, and a guiding post is slidably installed in the guiding groove. One end of the opening and closing push spring is fixedly installed with the guiding post. An opening and closing convex block is fixedly installed at the end of the adjusting disk and on one side of the transmission rod. The opening and closing convex block is a residual body formed by cutting the surface of a semi-cylindrical body through an inclined plane. An opening and closing ejector rod is movably installed at the end of the transmission rod, and a starting push spring located inside the transmission rod is fixedly installed at one end of the opening and closing ejector rod.

[0010] Furthermore, a limiting convex block is arranged on the outside of the adjusting disk, and a corresponding limiting groove is opened on the inner wall of the furnace body.

[0011] Furthermore, a threaded push tube is movably installed on the outside of the transmission rod. The threaded push tube is movably installed on the inner wall of the furnace body. The shape of the locking plug rack is U-shaped. One end of the locking plug rack is used to limit the movement of the adjusting head, and a threaded pressing block meshing with the outer thread of the threaded push tube is fixedly installed at the other end of the locking plug rack. A tightening fan blade is fixedly installed on one side of the threaded push tube. A slow air channel is opened at the top of the furnace body, and the slow air channel is a small hole.

[0012] The processing technology of the natural gas forging furnace for heat treatment of metal forgings includes the following steps:

[0013] S1. Put the metal forging to be heated into the furnace cavity, and push the furnace door through the handle to close the furnace door and seal the furnace cavity.

[0014] S2. During the closing process of the furnace door, the opening and closing rod will be pushed to move into the furnace body, and the air flow pressure at one end of the opening and closing rod will increase to overcome the elastic tension of the return spring until the threaded pressing block is disengaged from the threaded push tube, the adjusting head is attached to the transmission rod, the transmission rod abuts against the adjusting disk, and the connection through hole closes the communication between the air release cavity and the outside.

[0015] S3. During the heating process, the high pressure generated in the furnace cavity causes the locking plug to abut against the end of the adjusting head, further locking the furnace door to prevent accidental opening of the furnace door.

[0016] S4. After the heating is completed, when opening the furnace door, pull the handle, causing the handle to rotate according to the opening and closing rod, adjusting disc and transmission rod, prompting the connection hole to open and connecting the air release cavity with the air release channel. The air flow output from the air release cavity impacts the tightening fan blade to rotate the threaded push tube and move it towards the adjusting head, while compressing the opening and closing push spring.

[0017] S5. After the pressure in the furnace cavity is released, the locking plug will release the restriction on the adjusting head, and under the action of the elastic force of the opening and closing push spring, the opening and closing rod will be pushed outwards to open the furnace door. At the same time, during the movement of the baffle block, the air flow on one side is not sufficient to be completely replenished through the slow air channel, causing the baffle block to reduce the opening rate of the opening and closing rod to open the furnace door, thereby reducing the opening rate of the furnace door.

[0018] A natural gas forging furnace for heat treatment of metal forgings provided by the present application introduces the high-pressure air flow in the furnace cavity into the locking cavity. During the heat treatment process of metal forgings, the locking plug is pushed by the high-pressure air flow in the locking cavity to restrict the movement of the adjusting head, ensuring that the furnace door cannot be opened by external force when the furnace cavity is under high pressure. When the pressure in the furnace cavity is discharged according to the pulling of the handle, the air flow will be output from the air release channel, and then the tightening fan blade is rotated to squeeze the opening and closing push spring, ensuring that the furnace door can only be opened under normal pressure and enhancing the opening strength of the furnace door according to the compressed opening and closing push spring, reducing the manual opening strength. At the same time, by arranging the opening and closing push spring, when the furnace door is not fully closed, the elastic force of the opening and closing push spring will open the furnace door, thereby warning the operator through the opened furnace door that the furnace cavity is not fully sealed and normal heating work cannot be carried out. Finally, the effects of only being able to open the furnace door under normal pressure, locking the furnace door during operation, reducing the opening strength, and warning when the furnace door is not fully closed are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings forming a part of the specification depict the embodiments disclosed in the present application and, together with the specification, are used to explain the principles of the present application.

[0020] Referring to the drawings, the present disclosure can be more clearly understood from the following detailed description, where:

[0021] Figure 1 is the overall front perspective view;

[0022] Figure 2 is the overall back perspective view;

[0023] Figure 3 is the overall top cross-sectional view;

[0024] Figure 4 is an overall top view cross-sectional view;

[0025] Figure 5 is a composition diagram of a threaded push tube;

[0026] Figure 6 is a diagram of the ball head end;

[0027] Figure 7 is a three-dimensional view of the opening and closing rod;

[0028] Figure 8 is a layout diagram of the handle;

[0029] Figure 9 is a three-dimensional view of the adjusting disc.

[0030] In the figure: 1. Furnace body; 100. Furnace cavity; 101. Slow air duct; 102. Air discharge duct; 103. Locking cavity; 104. Air release cavity; 2. Furnace door; 200. Handle; 3. Opening and closing rod; 300. Ball head; 301. Adjusting head; 4. Locking insert frame; 400. Threaded pressing block; 5. Return spring; 6. Threaded push tube; 7. Adjusting disc; 700. Opening and closing convex block; 701. Connecting through hole; 8. Opening and closing push rod; 800. Starting push spring; 9. Tightening fan blade; 10. Transmission rod; 11. Guide groove; 12. Opening and closing push spring; 13. Partition block. Embodiment

[0031] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. Embodiment

[0032] Please refer to Figures 1-4, a furnace cavity 100 is provided in the inner cavity of the furnace body 1, a furnace door 2 for closing the furnace cavity 100 is hinged on the side wall of the furnace body 1, a lifting rod 3 is movably installed on the top of the furnace body 1, and a ball head 300 movably connected to the furnace door 2 is fixedly installed at one end of the lifting rod 3. An activity groove for the ball head 300 to slide is provided on the side wall of the furnace door 2, and an adjustment head 301 located in the furnace body 1 is fixedly installed at the other end of the lifting rod 3. A locking plug holder 4 located above the furnace cavity 100 is movably installed on the inner wall of the top of the furnace body 1, a locking cavity 103 communicating with one side of the locking plug holder 4 is provided on the inner wall of the top of the furnace body 1, and a return spring 5 fixedly installed with the furnace body 1 is fixedly installed on the other side of the locking plug holder 4. When the pressure in the furnace cavity 100 increases, one end of the locking plug holder 4 abuts against the adjustment head 301 to limit the movement of the adjustment head 301, so as to ensure that during the operation of the furnace cavity 100, the furnace door 2 is always locked on the furnace body 1 through the lifting rod 3, so that the air flow in the furnace cavity 100 will not be output from the gap between the furnace door 2 and the furnace body 1, thereby reducing the diffusion of heat in the furnace cavity 100 to the outside. A pressure relief cavity 104 is provided on the top of the furnace body 1, and a pressure relief device is provided on the furnace body 1 to realize that the pressure relief cavity 104 discharges the high-pressure air flow in the furnace cavity 100 to the outside, so as to ensure that during the actual operation, all the air flow in the furnace cavity 100 is discharged through the pressure relief device, and under the action of the elastic force of the return spring 5, the locking plug holder 4 will not block the adjustment head 301, so as to ensure that the adjustment head 301 is not restricted and facilitate the opening of the furnace door 2.

[0033] Reference Figure 4 and Figure 7 , by setting the shape of the adjustment head 301 as a combination of the bottoms of two frustums of a cone in contact, so as to ensure that during the actual use, when the furnace door 2 is closed and the lifting rod 3 is pushed inward, if it is not completely closed, combined with Figure 4, one end of the locking bracket 4 will be placed on the round platform on the right side of the adjusting head 301. Thus, under the elastic force of the return spring 5, the outer side of the adjusting head 301 is pushed by the locking bracket 4, causing the opening and closing rod 3 to push outwards. In this way, by increasing the opening and closing size of the furnace door 2, it warns the user that the furnace door 2 is not properly sealed. When the locking bracket 4 crosses the round platform on the right side of the adjusting head 301, the locking bracket 4 slides to the round platform on the left side of the adjusting head 301, so that the furnace door 2 will not be pushed out and at the same time the opening and closing rod 3 has a tendency to be pulled inwards, strengthening the closing strength of the furnace door 2. When the pressure in the locking cavity 103 continues to increase, the locking bracket 4 will continue to be pressed downwards, and one end of the locking bracket 4 will slide to the left end of the adjusting head 301, causing the left end of the adjusting head 301 to abut against the locking bracket 4. When there is pressure in the furnace cavity 100, it ensures that the opening and closing rod 3 cannot move outwards, thus avoiding the phenomenon that the high-pressure air flow inside the furnace cavity 100 rushes outwards when the user accidentally opens the furnace door 2 during misoperation, ensuring the safety during the opening and closing process of the furnace door 2. Embodiment

[0034] By setting the pressure relief device as an air flow valve and installing the air flow valve on the top of the furnace body 1 and communicating it with the air release cavity 104, it is ensured that during the opening process of the valve, the air release cavity 104 is communicated with the outside, so that the residual pressure in the furnace cavity 100 is output outwards, thus reducing the phenomenon that the high-pressure air flow in the furnace cavity 100 rushes outwards when the furnace door 2 is opened instantaneously. Embodiment

[0035] Please refer to Figures 2-6 and Figure 8 and Figure 9, the pressure relief device includes a partition block 13, a transmission rod 10, an opening and closing push spring 12, an adjusting disk 7 and a handle 200. A partition block 13 is slidably installed on the inner wall of the furnace body 1 on one side of the end of the adjusting head 301, and a transmission rod 10 coaxial with the adjusting head 301 is movably installed in the middle of the partition block 13, and an opening and closing push spring 12 is movably installed on one side of the partition block 13. An adjusting disk 7 coaxial with the transmission rod 10 is movably installed on the inner wall of the furnace body 1, and an air release channel 102 is formed in the furnace body 1. At the same time, a connecting through hole 701 for communicating the air release cavity 104 and the air release channel 102 is formed in the side wall of the adjusting disk 7. When the adjusting disk 7 is pushed by the transmission rod 10, the adjusting disk 7 is reset and the connecting through hole 701 is blocked by the inner wall of the furnace body 1 to close the air release channel 102 and the air release cavity 104. A rack is arranged at the end of the ball head 300, and a handle 200 is hinged on the surface of the furnace door 2. One end of the handle 200 meshes with the rack at the end of the ball head 300 after the furnace door 2 is closed. The handle 200 is set in an L shape, so as to ensure that when the furnace door 2 is closed, the furnace door 2 is pushed to drive the opening and closing rod 3 to push the transmission rod 10 by pressing the handle 200. Anti-slip threads are arranged at the ends of both the end of the adjusting head 301 and the end of the transmission rod 10, so that the adjusting head 301 will push the partition block 13 to move towards the adjusting disk 7, thereby pressing the opening and closing push spring 12. At this time, since the threaded push pipe 6 is not provided, the opening and closing push spring 12 will be pressed in the furnace body 1. When the furnace door 2 is completely closed, one end of the transmission rod 10 will be pressed on the end of the adjusting disk 7, thereby realizing the reset of the adjusting disk 7 and closing the connecting through hole 701. During the opening process, by pulling the handle 200 outwards, the handle 200 will drive the opening and closing rod 3 to rotate, and the adjusting disk 7 will be rotated synchronously through the transmission rod 10 by the adjusting head 301, prompting the connecting through hole 701 to communicate the air release cavity 104 and the air release channel 102. Until the pressure in the furnace cavity 100 is released, the locking plug 4 will be separated from the end of the adjusting head 301, making the adjusting head 301 unobstructed after output, and it is easy for the user to pull open the furnace door 2 through the handle 200, ensuring that the furnace door 2 will release the pressure in the furnace cavity 100 first during the opening process.

[0036] In order to ensure that the adjusting disc 7 automatically returns to its original position when the furnace door 2 is closed, so that the through hole 701 is opened, and during the process of pulling the handle 200, the through hole 701 is also opened. Therefore, by setting the surface shape of the blocking block 13 as an ellipse, a guiding groove 11 is opened on the side wall of the transmission rod 10, and a guiding post is slidably installed in the guiding groove 11. One end of the opening and closing push spring 12 is fixedly installed with the guiding post. At the same time, an opening and closing convex block 700 is fixedly installed at the end of the adjusting disc 7 and on one side of the transmission rod 10. The opening and closing convex block 700 is a residue of the surface cut by an inclined plane of a semi-cylindrical body. The number of the opening and closing convex blocks 700 is two, and the two opening and closing convex blocks 700 are symmetrically arranged at the center of the end of the adjusting disc 7. An opening and closing push rod 8 is movably installed at the end of the transmission rod 10, and a starting push spring 800 located inside the transmission rod 10 is fixedly installed at one end of the opening and closing push rod 8. This ensures that when the opening and closing rod 3 is not inserted into the furnace body 1, at this time, the transmission rod 10 is restricted by the guiding post, so that the transmission rod 10 always remains in the normal state under the action of the elastic force of the opening and closing push spring 12. When the adjusting head 301 pushes the transmission rod 10 to move to the right, the normally positioned opening and closing push rod 8 will push against the opening and closing convex block 700, and by means of the inclined plane on the surface of the opening and closing convex block 700, the adjusting disc 7 is rotated for reset, so that the through hole 701 is closed. Subsequently, when the handle 200 drives the transmission rod 10 to rotate, and the opening and closing push rod 8 rotates while pushing against the adjusting disc 7, the adjusting disc 7 will rotate synchronously, so that the through hole 701 communicates the air release channel 102 and the air release cavity 104, so as to ensure that the furnace door 2 is depressurized during the opening process, and during the opening and closing processes of the furnace door 2, the adjusting disc 7 will open and close automatically, ensuring that the pressure in the furnace cavity 100 is depressurized according to the needs of the user.

[0037] In order to limit the rotation angle of the adjusting disc 7 during the rotation process, a limiting convex block is provided on the outside of the adjusting disc 7, and a corresponding limiting groove is opened on the inner wall of the furnace body 1, so that the adjusting disc 7 can only move in the limiting groove by means of the limiting convex block, thereby limiting the rotation angle of the adjusting disc 7, ensuring that when the adjusting disc 7 is opened, the through hole 701 can discharge the pressure in the furnace cavity 100 with the largest channel, and also avoiding the phenomenon that it is not easy to reset later due to the excessive rotation angle of the adjusting disc 7.

[0038] A threaded push tube 6 is movably installed outside the transmission rod 10, and the threaded push tube 6 is movably installed on the inner wall of the furnace body 1. The shape of the locking plug 4 is U-shaped. One end of the locking plug 4 is used to limit the movement of the adjusting head 301, and a threaded pressing block 400 that meshes with the outer thread of the threaded push tube 6 is fixedly installed at the other end of the locking plug 4. A tightening fan blade 9 is fixedly installed on one side of the threaded push tube 6, and a slow air passage 101 is opened at the top of the furnace body 1. The slow air passage 101 is a small hole. Thus, during actual use, when the furnace door 2 is closed, when the opening and closing rod 3 is pushed to the right, the air flow on the right side of the opening and closing rod 3 will be blocked by the baffle block 13. Then, during the closing process of the furnace door 2, the pressure on the right side of the opening and closing rod 3 will increase, thereby pushing the locking plug 4 upward and causing the threaded pressing block 400 to disengage from the threaded push tube 6. The threaded push tube 6 will abut against the furnace body 1 under the elastic force of the opening and closing push spring 12, and at the same time, the transmission rod 10 will be in its normal position, which is conducive to the subsequent opening and closing push rod 8 resetting the adjusting disk 7 and closing the through hole 701. As the opening and closing rod 3 is continuously pressed to the right until the locking plug 4 is stuck on the side wall of the round table of the adjusting head 301, it is ensured that the adjusting head 301 cannot open the furnace door 2. At this time, the adjusting head 301 abuts against the transmission rod 10, the opening and closing push rod 8 abuts against the adjusting disk 7, and the baffle block 13 passes over the slow air passage 101, making the air flow on the right side of the opening and closing rod 3 communicate with the slow air passage 101. When the handle 200 is pulled outwards to open the furnace door 2, the opening and closing rod 3 will drive the transmission rod 10 to rotate, realizing the opening of the through hole 701. The air flow in the through hole 701 will impact the tightening fan blade 9 to rotate. At this time, since one end of the opening and closing rod 3 is always communicated with the outside through the slow air passage 101, after the opening and closing rod 3 stops moving, the air flow pressure on the right side of the opening and closing rod 3 decreases. Under the elastic force of the return spring 5, the locking plug 4 is pulled, making the threaded pressing block 400 stick to the threaded push tube 6. The threaded push tube 6 rotates due to the air flow impact on the tightening fan blade 9, and will move to the left through the threaded pressing block 400, compressing the opening and closing push spring 12. After the pressure in the furnace cavity 100 is released, the threaded push tube 6 is locked by the threaded pressing block 400 and cannot move. The decrease in the pressure in the furnace cavity 100 will cause the locking plug 4 to be pushed back under the elastic force of the return spring 5. At this time, under the elastic force of the opening and closing push spring 12, the baffle block 13 will move to the left. After the baffle block 13 passes over the slow air passage 101, the air flow on the right side of the baffle block 13 and the left side of the threaded push tube 6 can only be inhaled through the slow air passage 101. Since the slow air passage 101 is a small hole, when the baffle block 13 moves to the left, the air flow on the right side of the baffle block 13 can only be slowly supplemented through the slow air passage 101, reducing the ejection rate of the baffle block 13, so that the furnace door 2 is slowly opened by the elastic force of the opening and closing push spring 12, reducing the opening strength of the user and avoiding the phenomenon that the operator outside the furnace door 2 is accidentally hit due to the furnace door 2 opening too fast. Embodiment

[0039] A processing technology for a natural gas forging furnace used in the heat treatment of a metal forging, comprising the following steps:

[0040] S1. Place the metal forging to be heated into the furnace chamber 100, and push the furnace door 2 through the handle 200 to close the furnace door 2 and seal the furnace chamber 100;

[0041] S2. During the closing process of the furnace door 2, it will push the opening and closing rod 3 to move into the furnace body 1, and due to the increase in the air flow pressure at one end of the opening and closing rod 3, the elastic tension of the return spring 5 is overcome until the threaded pressing block 400 is disengaged from the threaded push tube 6, the adjusting head 301 is attached to the transmission rod 10, the transmission rod 10 abuts against the adjusting disc 7, and the through hole 701 closes the connection between the air release cavity 104 and the outside;

[0042] S3. During the heating process, the high pressure generated in the furnace chamber 100 will cause the locking plug bracket 4 to abut against the end of the adjusting head 301, further locking the furnace door 2 to prevent the furnace door 2 from being accidentally opened;

[0043] S4. After the heating is completed, when opening the furnace door 2, pull the handle 200, so that the handle 200 rotates according to the opening and closing rod 3, the adjusting disc 7 and the transmission rod 10, prompting the through hole 701 to open, and connecting the air release cavity 104 with the air release channel 102. The air flow output from the air release cavity 104 impacts the tightening fan blade 9 to rotate the threaded push tube 6 and move towards the adjusting head 301, while compressing the opening and closing push spring 12;

[0044] S5. After the pressure in the furnace chamber 100 is released, it will cause the locking plug bracket 4 to release the restriction on the adjusting head 301, and under the action of the elastic force of the opening and closing push spring 12, the opening and closing rod 3 is pushed outwards, opening the furnace door 2. At the same time, during the movement of the baffle block 13, the air flow on one side is not sufficient to be completely supplemented through the slow air channel 101, so that the rate at which the baffle block 13 pushes the opening and closing rod 3 to open the furnace door 2 is reduced, thereby reducing the opening rate of the furnace door 2.

Claims

1. A natural gas forging furnace for heat treatment of metal forgings, characterized in that, Including a furnace body (1): A furnace cavity (100) is provided in the inner cavity of the furnace body (1). A furnace door (2) is hinged to the side wall of the furnace body (1). An opening and closing rod (3) is movably installed at the top of the furnace body (1). One end of the opening and closing rod (3) is fixedly installed with a ball head (300) movably connected to the furnace door (2). The other end of the opening and closing rod (3) is fixedly installed with an adjusting head (301). A locking plug holder (4) is movably installed on the inner top wall of the furnace body (1) above the furnace cavity (100). A locking cavity (103) communicating with one side of the locking plug holder (4) is provided on the inner top wall of the furnace body (1). A return spring (5) is fixedly installed on the other side of the locking plug holder (4). When the pressure in the furnace cavity (100) increases, one end of the locking plug holder (4) abuts against the adjusting head (301) to limit the movement of the adjusting head (301). A pressure relief cavity (104) is provided at the top of the furnace body (1). A pressure relief device is provided on the furnace body (1) to enable the pressure relief cavity (104) to discharge the high-pressure air flow in the furnace cavity (100) outward.

2. The natural gas forging furnace for heat treatment of metal forgings according to claim 1, characterized in that, The shape of the adjusting head (301) is set as a combination of the bottoms of two frustums of a cone being in contact.

3. The natural gas forging furnace for heat treatment of metal forgings according to claim 1, characterized in that, The pressure relief device is set as an air flow valve, and the air flow valve is installed at the top of the furnace body (1) and communicates with the pressure relief cavity (104).

4. The natural gas forging furnace for heat treatment of metal forgings according to claim 1, characterized in that, The pressure relief device includes a partition block (13), a transmission rod (10), an opening and closing push spring (12), an adjusting disk (7), and a handle (200). A partition block (13) is slidably installed on the inner wall of the furnace body (1) on one side of the end of the adjusting head (301). A transmission rod (10) arranged coaxially with the adjusting head (301) is movably installed in the middle of the partition block (13). An opening and closing push spring (12) is movably installed on one side of the partition block (13). An adjusting disk (7) coaxially with the transmission rod (10) is movably installed on the inner wall of the furnace body (1). An air release channel (102) is provided on the furnace body (1). A connection through hole (701) is provided on the side wall of the adjusting disk (7). When the transmission rod (10) pushes the adjusting disk (7), the adjusting disk (7) is reset and the connection through hole (701) is blocked by the inner wall of the furnace body (1) to close the air release channel (102) and the pressure relief cavity (104). A rack is provided at the end of the ball head (300). A handle (200) is hinged to the surface of the furnace door (2), and one end of the handle (200) meshes with the rack at the end of the ball head (300) after the furnace door (2) is closed.

5. The natural gas forging furnace for heat treatment of metal forgings according to claim 4, characterized in that, The surface shape of the partition block (13) is set to be oval. A guiding groove (11) is formed in the side wall of the transmission rod (10), and a guiding post is slidably installed in the guiding groove (11). One end of the opening and closing push spring (12) is fixedly installed with the guiding post. At the end of the adjusting disc (7) and on one side of the transmission rod (10), an opening and closing convex block (700) is fixedly installed. The opening and closing convex block (700) is a residue of a semi-cylindrical body cut by an inclined plane on the surface. The end of the transmission rod (10) is movably installed with an opening and closing ejector rod (8), and one end of the opening and closing ejector rod (8) is fixedly installed with a starting top spring (800) located inside the transmission rod (10).

6. The natural gas forging furnace for heat treatment of metal forgings according to claim 4, characterized in that, A limiting convex block is arranged on the outer side of the adjusting disc (7), and a corresponding limiting groove is formed in the inner wall of the furnace body (1).

7. The natural gas forging furnace for heat treatment of metal forgings according to claim 4, characterized in that, A threaded push tube (6) is movably installed on the outer side of the transmission rod (10). The threaded push tube (6) is movably installed with the inner wall of the furnace body (1). The shape of the locking plug bracket (4) is U-shaped. One end of the locking plug bracket (4) is used to limit the movement of the adjusting head (301), and the other end of the locking plug bracket (4) is fixedly installed with a threaded pressing block (400) threadedly engaged with the outer side of the threaded push tube (6). A tightening fan blade (9) is fixedly installed on one side of the threaded push tube (6). A slow air passage (101) is formed in the top of the furnace body (1), and the slow air passage (101) is a small hole.

8. A processing technology for a natural gas forging furnace used in heat treatment of metal forgings as described in claim 7, characterized in that, It includes the following steps: S1. Put the metal forging to be heated into the furnace cavity (100), and push the furnace door (2) through the handle (200) to close the furnace door (2) and seal the furnace cavity (100). S2. During the closing process of the furnace door (2), it will push the opening and closing rod (3) to move into the furnace body (1). Due to the increase in the air flow pressure at one end of the opening and closing rod (3), it overcomes the elastic tension of the return spring (5) until the threaded pressing block (400) is disengaged from the threaded push tube (6), the adjusting head (301) is attached to the transmission rod (10), the transmission rod (10) abuts against the adjusting disc (7), and the connection hole (701) closes the communication between the air release cavity (104) and the outside. S3. During the heating process, the high pressure generated in the furnace cavity (100) will cause the locking plug bracket (4) to abut against the end of the adjusting head (301), further locking the furnace door (2) to prevent the furnace door (2) from being accidentally opened. S4. After the heating is completed, when opening the furnace door (2), pull the handle (200) to make the handle (200) rotate according to the opening and closing rod (3), the adjusting disc (7) and the transmission rod (10), so as to open the connection hole (701) and communicate the air release cavity (104) with the air release passage (102). The air flow output from the air release cavity (104) impacts the tightening fan blade (9) to rotate the threaded push tube (6) and move it in the direction of the adjusting head (301), and at the same time compress the opening and closing push spring (12). After the pressure in the furnace cavity (100) is discharged, the locking plug bracket (4) will release the restriction on the adjusting head (301), and under the action of the elastic force of the opening and closing push spring (12), the opening and closing rod (3) will be pushed outwards, causing the furnace door (2) to open. At the same time, during the movement of the baffle block (13), the air flow on one side is not sufficient to be completely replenished through the slow air passage (101), so that the rate at which the baffle block (13) pushes the opening and closing rod (3) to open the furnace door (2) is reduced, thereby reducing the opening rate of the furnace door (2).

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