An oven for drying metal powder for powder metallurgy
By introducing locking, warning, exhaust, and cooling devices into the powder metallurgy drying oven, the safety hazards of opening the oven door at high temperatures have been solved, and the protection of operators and the improvement of the production environment have been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU MENGDA NEW MATERIALS TECH CO LTD
- Filing Date
- 2026-06-22
- Publication Date
- 2026-07-31
AI Technical Summary
Existing powder metallurgy drying ovens pose safety hazards, as opening the door at high temperatures can easily cause burns to operators and allow hot air to escape. Furthermore, opening the high-temperature oven door affects the production environment.
An oven with a locking device, a warning device, an exhaust device, and a cooling device was designed. The locking block locks the oven door at high temperatures, prompts personnel to stay away, exhausts hot air, and cools the oven to ensure safety and the production environment.
It effectively prevents burns, avoids hot air escaping, improves the production environment, and enhances operational safety and production conditions.
Smart Images
Figure CN122486342A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of drying ovens for drying metal powders in powder metallurgy, specifically to a drying oven for drying metal powders in powder metallurgy. Background Technology
[0002] Powder metallurgy is an important metal parts forming process, and the drying treatment of metal powder has a critical impact on the subsequent pressing and sintering quality. If the moisture content of the metal powder is too high, it will not only reduce the flowability of the powder and affect the uniformity of mold cavity filling, but may also cause defects such as oxidation and porosity during sintering, ultimately leading to a decline in the mechanical properties of the parts. Therefore, in powder metallurgy production lines, ovens are usually used to heat and dry the metal powder.
[0003] Most existing powder metallurgy drying ovens use electric heating or hot air circulation to raise the internal temperature to a set value and maintain it for a certain period of time to remove free water from the metal powder. After the drying process is completed, operators need to open the oven door to remove the material. However, the internal temperature of the dried metal powder often reaches over 150°C, and different metal powders (such as aluminum powder, iron powder, copper powder, etc.) pose varying degrees of oxidation or even spontaneous combustion risks when in contact with air at high temperatures. At the same time, the hot air rushing out when the high-temperature oven door is opened can easily cause burns to operators. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides an oven for drying metal powders used in powder metallurgy, which solves the problems mentioned in the background section.
[0005] To achieve the above objectives, the present invention provides the following technical solution: an oven for drying metal powders used in powder metallurgy, comprising: an oven, a door hinged to the front of the oven, a control panel fixed to the front of the oven, and a locking device fixed to the side wall of the oven, the locking device comprising: A connecting box is fixed to the side wall of the oven. A piston plate is slidably installed on the inner side of the connecting box. Carbon dioxide gas is added to the connecting box on the right side of the piston plate. A copper rod, one end of which penetrates the side wall of the connecting box and is fixedly connected at the penetration point; the other end of which penetrates the side wall of the oven and is fixedly connected at the penetration point; a return spring is fixed to the side wall of the piston plate, and the side of the return spring away from the piston plate is fixed to the inside of the connecting box. A guide block is slidably mounted on the inner side of the connecting box. A connecting spring is fixed to the side wall of the guide block. The side of the connecting spring away from the guide block is fixed to the inner side of the connecting box. A sleeve rod is fixed to the bottom of the guide block. A sleeve is slidably mounted on the outer wall of the sleeve rod. A locking block is provided, which passes through the side wall of the connecting box and is slidably connected at the through point. An inclined groove is provided on the outside of the locking block. A pressing rod is fixed on the outer wall of the sleeve rod. The end of the pressing rod is fitted with the inner side of the inclined groove. By setting the locking block, the box door can be locked so that the box door cannot be opened under high temperature conditions.
[0006] According to the above technical solution, a return spring is fixed to the end of the sleeve rod, and the end of the return spring away from the sleeve rod is fixed to the inner side of the sleeve.
[0007] According to the above technical solution, the connecting box is equipped with a prompting device, which is used to remind workers to prevent burns. The side wall of the oven is equipped with an exhaust device, which is used to exhaust the hot air inside the oven. The bottom of the exhaust device is equipped with a cooling device.
[0008] According to the above technical solution, the prompting device includes: an L-shaped block, which is fixed to the outer wall of the sleeve rod; a prompting plate, which extends through the upper and lower sides of the connecting box and is slidably connected at the through point, and a triangular block is fixed to the end of the prompting plate.
[0009] According to the above technical solution, the inclined surface of the triangular block is provided with a sliding groove, and a hinge block is slidably installed on the inner side of the sliding groove. The side wall of the hinge block is hinged to the end of the L-shaped block.
[0010] According to the above technical solution, the exhaust device includes: a transmission column, which passes through the side wall of the connecting box and is slidably connected at the passage, and a compression plate is fixed at the end of the transmission column; A transmission spring, one side of which is fixed to the side wall of the extrusion plate, and the other side of which is fixed to the side wall of the connecting box; a support plate, which is fixed to the side wall of the connecting box, and a pressure sensor is fixed to the outer wall of the support plate, and the pressure sensor is electrically connected to the control panel.
[0011] According to the above technical solution, an exhaust pipe runs through the side wall of the oven and is fixedly connected at the penetration point. An electromagnetic valve is fixed to the outer wall of the exhaust pipe. The electromagnetic valve is electrically connected to the control panel. A thin tube is fixed to the end of the exhaust pipe.
[0012] According to the above technical solution, the cooling device includes: a water storage box, the water storage box is fixed to the side wall of the oven, a square block is fixed to the top of the water storage box, the bottom of the thin tube is fixedly connected to the top of the square block, and the thin tube communicates with the inside of the square block. An air inlet pipe is fixed to the bottom of a square block and the square block is connected to the air inlet pipe. The air inlet pipe passes through the top of the water storage box and is fixedly connected at the point of penetration. An air outlet pipe is fixed to the top of the water storage box. A connecting pipe is fixed to the side wall of the water storage box and a valve is installed on the connecting pipe. A connecting pipe is fixed to the side wall of the square block and is connected to the square block.
[0013] According to the above technical solution, a first baffle is slidably connected through the side wall of the square block. A bolt is rotatably installed on the side wall of the first baffle, and the bolt passes through the side wall of the square block and is threadedly connected through the passage. A second baffle is fixed at the bottom of the first baffle, and the second baffle passes through the side wall of the square block and is slidably connected through the passage. By setting the first baffle and the second baffle, the position of hot air emission can be switched.
[0014] This invention provides an oven for drying metal powders used in powder metallurgy. It has the following beneficial effects: 1. This invention, by setting up a connecting box, copper rod, piston plate, reset spring, sleeve, return spring, sleeve rod, locking block, inclined groove, extrusion rod, guide block, and connecting spring, allows the locking block to release its restriction on the oven door after the metal powder drying process is completed and the temperature inside the oven drops to a safe temperature. This effectively protects the workers and solves the problem of burns to workers caused by opening the oven door when the temperature inside the oven is still too high.
[0015] 2. By setting up an L-shaped block, a triangular block, a hinge block, and a warning board, the present invention will unfold the warning board when the temperature inside the oven is too high, thereby alerting the staff not to approach the oven door and preventing the temperature at the oven door from becoming too high and causing injury to the staff.
[0016] 3. By setting up a transmission column, transmission spring, extrusion plate, support plate, pressure sensor, exhaust pipe, solenoid valve and thin tube, the temperature inside the oven will gradually decrease after drying. At this time, the exhaust pipe can be controlled to open, so that the hot air inside the oven can be discharged through the exhaust pipe, thereby avoiding a large amount of hot air rushing out from the oven door and spraying directly onto the workers' bodies when the oven door is opened, thus preventing discomfort to the workers. 4. This invention, by setting up a water storage box, an exhaust pipe, a connecting pipe, a square block, an intake pipe, bolts, a first baffle, a second baffle, and a connecting pipe, allows hot air to be cooled by passing it into the cooling water in the water storage box when it is discharged from the oven. The cooled air is then discharged from the exhaust pipe, thus avoiding the direct discharge of large amounts of hot air into the production workshop, which would cause the workshop temperature to rise, the production environment to deteriorate, and affect the normal production operations of the workers. In addition, in winter, the bolts can be turned to make the first baffle block the thin pipe while keeping the connecting pipe open. At this time, the hot air is discharged from the connecting pipe and enters the production workshop, using the residual heat to warm the workshop, thereby improving the working conditions in winter and facilitating the production operations of the workers. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall bottom structure of the present invention; Figure 3 This is a partial cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the internal structure of the connector box of the present invention; Figure 5 This is a partial structural diagram of the present invention; Figure 6 This is a schematic diagram of the internal structure of the water storage box of the present invention.
[0018] In the diagram: 1. Oven; 2. Oven door; 3. Control panel; 41. Connecting box; 42. Copper rod; 43. Piston plate; 44. Return spring; 45. Sleeve; 46. Return spring; 47. Sleeve rod; 48. Locking block; 49. Inclined groove; 410. Pressing rod; 411. Guide block; 412. Connecting spring; 501. L-shaped block; 502. Triangular block; 503. Hinge block; 504. Indication plate; 601. Transmission column; 602. Transmission spring; 603. Extrusion plate; 604. Support plate; 605. Pressure sensor; 606. Exhaust pipe; 607. Solenoid valve; 608. Thin tube; 701. Water storage box; 702. Air outlet pipe; 703. Connecting pipe; 704. Square block; 705. Air inlet pipe; 706. Bolt; 707. No. 1 baffle; 708. No. 2 baffle; 709. Connecting pipe. Detailed Implementation
[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0020] Please see Figures 1-6 One embodiment of the present invention is: an oven for drying metal powders for powder metallurgy, comprising: an oven 1, a door 2 hinged to the front of the oven 1, a control panel 3 fixed to the front of the oven 1, and a locking device fixed to the side wall of the oven 1, the locking device comprising: The oven comprises a connecting box 41, a copper rod 42, a piston plate 43, a return spring 44, a sleeve 45, a return spring 46, a sleeve rod 47, a locking block 48, a slanted groove 49, a pressing rod 410, a guide block 411, and a connecting spring 412. The connecting box 41 is fixed to the side wall of the oven 1. The piston plate 43 is slidably installed inside the connecting box 41. Carbon dioxide gas is added to the right side of the connecting box 41. One end of the copper rod 42 penetrates the side wall of the connecting box 41 and is fixedly connected at the penetration point. The other end of the copper rod 42 penetrates the side wall of the oven 1 and is fixedly connected at the penetration point. A return spring 44 is fixed to the side wall of the piston plate 43. The side of the return spring 44 away from the piston plate 43 is fixed to the inside of the connecting box 41. The guide block 411 is slidably installed in the connecting box 41. Inside the guide block 411, a connecting spring 412 is fixed to the side wall of the guide block 411. The side of the connecting spring 412 away from the guide block 411 is fixed to the inside of the connecting box 41. A sleeve rod 47 is fixed to the bottom of the guide block 411. A sleeve 45 is slidably installed on the outer wall of the sleeve rod 47. A locking block 48 passes through the side wall of the connecting box 41 and is slidably connected at the point of penetration. A slanted groove 49 is provided on the outside of the locking block 48. A pressing rod 410 is fixed to the outer wall of the sleeve rod 47. The end of the pressing rod 410 fits against the inside of the slanted groove 49. By setting the locking block 48, the box door 2 can be locked so that the box door 2 cannot be opened under high temperature conditions. A return spring 46 is fixed to the end of the sleeve rod 47. The end of the return spring 46 away from the sleeve rod 47 is fixed to the inside of the sleeve 45.
[0021] By setting up a connecting box 41, copper rod 42, piston plate 43, reset spring 44, sleeve 45, return spring 46, sleeve rod 47, locking block 48, inclined groove 49, extrusion rod 410, guide block 411 and connecting spring 412, after the metal powder is dried, when the temperature inside the oven 1 drops to a safe temperature, the locking block 48 can be released from its position on the oven door 2, thus protecting the staff and solving the problem of easy burns to the staff when the oven door 2 is opened while the temperature inside the oven 1 is still too high.
[0022] In this embodiment, during operation: when the oven door 2 is closed, the drying process of the metal powder causes the temperature inside the oven 1 to rise. This heat is transferred to the copper rod 42, causing its temperature to rise. This temperature rise is then transferred to the connecting box 41, causing the carbon dioxide gas in the connecting box 41 to expand and compress the piston plate 43. When the piston plate 43 is under pressure, it moves. This movement stretches and deforms the return spring 44, compressing the sleeve 45. As the sleeve 45 moves, and because the spring force coefficient of the return spring 46 is five times that of the connecting spring 412, the sleeve 45... 5. The sleeve rod 47 moves. When the sleeve 45 moves, it can move the sleeve rod 47, which in turn moves the guide block 411. This causes the connecting spring 412 to compress, which in turn causes the sleeve rod 47 to move the pressing rod 410. When the pressing rod 410 moves, it can move in the inclined groove 49. When the inclined groove 49 is subjected to pressing force, the locking block 48 can be moved out of the connecting box 41, which can block the door 2, so that the door 2 cannot be opened when the oven 1 is in a high temperature state. When the locking block 48 is completely moved out of the connecting box 41, and when the piston plate 43 is still being pressed by the piston plate 43, the sleeve 45 moves on the sleeve rod 47, which compresses the return spring 46. After the metal powder in oven 1 is dried, oven 1 is closed, allowing the temperature inside oven 1 to drop. When the temperature inside oven 1 drops to a safe temperature, the return spring 44 is compressed, which causes the return spring 44 to drive the piston plate 43 to reset, causing the sleeve 45 to drive the sleeve rod 47 to move, causing the extrusion rod 410 to reset in the inclined groove 49. This allows the extrusion rod 410 to extrude the locking block 48 into the connecting box 41, preventing the locking block 48 from blocking or limiting the door 2, allowing the door 2 to open and the metal powder inside oven 1 to be removed.
[0023] Please see Figures 1-6 Based on the above embodiments, in another embodiment of the present invention, a prompting device is provided on the connecting box 41, which is used to remind workers to prevent burns. The prompting device includes: an L-shaped block 501, a triangular block 502, a hinge block 503, and a prompting plate 504; the L-shaped block 501 is fixed to the outer wall of the sleeve rod 47; the prompting plate 504 passes through the upper and lower sides of the connecting box 41 and is slidably connected at the through point, the end of the prompting plate 504 is fixed with a triangular block 502, the inclined surface of the triangular block 502 is provided with a groove, the inner side of the groove is slidably installed with a hinge block 503, and the side wall of the hinge block 503 is hinged to the end of the L-shaped block 501; By setting up L-shaped block 501, triangular block 502, hinge block 503 and indicator plate 504, when the temperature inside the oven 1 is too high, the indicator plate 504 will be unfolded to remind the staff not to approach the oven door 2, so as to prevent the temperature at the oven door 2 from being too high and causing injury to the staff. An exhaust device is provided on the side wall of the oven 1 to discharge hot air from inside the oven 1. The exhaust device includes: a drive column 601, a drive spring 602, a pressing plate 603, a support plate 604, a pressure sensor 605, an exhaust pipe 606, a solenoid valve 607, and a thin tube 608. The drive column 601 passes through the side wall of the connecting box 41 and is slidably connected at the penetration point. The pressing plate 603 is fixed to the end of the drive column 601, and one side of the drive spring 602 is fixed to the side of the pressing plate 603. The other side of the transmission spring 602 is fixed to the side wall of the connecting box 41; the support plate 604 is fixed to the side wall of the connecting box 41, and a pressure sensor 605 is fixed to the outer wall of the support plate 604. The pressure sensor 605 is electrically connected to the control panel 3; an exhaust pipe 606 passes through the side wall of the oven 1 and is fixedly connected at the passage. A solenoid valve 607 is fixed to the outer wall of the exhaust pipe 606. The solenoid valve 607 is electrically connected to the control panel 3. A thin tube 608 is fixed to the end of the exhaust pipe 606.
[0024] By setting up a transmission column 601, a transmission spring 602, a pressing plate 603, a support plate 604, a pressure sensor 605, an exhaust pipe 606, a solenoid valve 607, and a thin tube 608, the temperature inside the oven 1 will gradually decrease after drying. At this time, the exhaust pipe 606 can be opened to allow the hot air inside the oven 1 to be discharged through the exhaust pipe 606, thereby preventing a large amount of hot air from rushing out of the oven door 2 and spraying directly onto the workers' bodies when the oven door 2 is opened, thus preventing discomfort to the workers.
[0025] A cooling device is installed at the bottom of the exhaust system. The cooling device includes: a water storage box 701, an exhaust pipe 702, a connecting pipe 703, a square block 704, an intake pipe 705, a bolt 706, a first baffle 707, and a second baffle 708. The water storage box 701 is fixed to the side wall of the oven 1. A square block 704 is fixed to the top of the water storage box 701. The bottom of a thin pipe 608 is fixedly connected to the top of the square block 704, and the thin pipe 608 communicates with the interior of the square block 704. The intake pipe 705 is fixed to the bottom of the square block 704, and the square block 704 communicates with the intake pipe 705. The intake pipe 705 passes through the top of the water storage box 701, and the passage is fixedly connected. An exhaust port is fixed to the top of the water storage box 701. Pipe 702 and water storage box 701 are fixed with connecting pipe 709. A valve is installed on connecting pipe 709. Connecting pipe 703 is fixed to the side wall of square block 704 and is connected to square block 704. A first baffle 707 is slidably connected through the side wall of square block 704. Bolt 706 is rotatably installed on the side wall of first baffle 707 and is threaded through the side wall of square block 704. A second baffle 708 is fixed to the bottom of first baffle 707 and is slidably connected through the side wall of square block 704. The setting of first baffle 707 and second baffle 708 can switch the position of hot air discharge.
[0026] By configuring a water storage box 701, an exhaust pipe 702, a connecting pipe 703, a square block 704, an intake pipe 705, a bolt 706, a first baffle 707, a second baffle 708, and a connecting pipe 709, when hot air is discharged from the oven 1, it can be passed into the cooling water in the water storage box 701 for cooling. The cooled air is then discharged from the exhaust pipe 702, thus preventing a large amount of hot air from being directly discharged into the production workshop, which would cause the workshop temperature to rise, the production environment to deteriorate, and affect the normal production operations of the workers. In addition, in winter, by rotating the bolt 706, the first baffle 707 can be blocked by the thin pipe 608, while the connecting pipe 703 remains open. At this time, the hot air is discharged from the connecting pipe 703 and enters the production workshop, using residual heat to warm the workshop, thereby improving the working conditions in winter and facilitating the production operations of the workers.
[0027] In this embodiment, when the sleeve 45 moves by pressing the sleeve rod 47, it drives the L-shaped block 501 to move, causing the L-shaped block 501 to press against the hinge block 503. This causes the hinge block 503 to move on the inclined surface of the triangular block 502, thus allowing the hinge block 503 to press the triangular block 502 upward. When the triangular block 502 moves upward, it drives the indicator plate 504 upward, causing the indicator plate 504 to move out of the connecting box 41. This serves as a reminder to the staff that the oven 1 is at a high temperature and they should not approach it. When the sleeve 45 moves the sleeve rod 47 back to its original position, the L-shaped block 501 returns to its original position, causing the L-shaped block 501 to pull the hinge block 503 to slide on the inclined surface of the triangular block 502. This allows the triangular block 502 to drive the indicator plate 504 into the connecting box 41, thus prompting the staff to approach the oven 1 and open the oven door 2. Furthermore, when the piston plate 43 moves under the pressure of carbon dioxide, it will prevent the piston plate 43 from pressing the transmission column 601. Because the transmission spring 602 is in a stretched state, the pressing plate 603 will no longer press the pressure sensor 605, thus preventing the pressure sensor 605 from sending an electrical signal to the control panel 3. This allows the control panel 3 to control the solenoid valve 607 to close, thereby closing the exhaust pipe 606 and preventing hot air from being released from the oven 1. After drying, the return spring 44 will drive the piston plate 43 to return to its original position, and the spring force coefficient of the return spring 44 is higher than that of the piston plate 601. The transmission spring 602 has a large elastic coefficient, which enables the piston plate 43 to press the transmission column 601 to move, allowing the pressing plate 603 to press the pressure sensor 605. The pressure sensor 605 sends an electrical signal to the control panel 3, which in turn controls the solenoid valve 607 to open, thereby opening the exhaust pipe 606 and allowing the gas in the oven 1 to be discharged. The gas is then discharged through the thin pipe 608 into the square block 704, allowing the hot gas to enter the water storage box 701 to cool it down. The cooled gas is then discharged from the exhaust pipe 702.
[0028] 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 oven for drying metal powders used in powder metallurgy, comprising: An oven (1), characterized in that a door (2) is hinged to the front of the oven (1), a control panel (3) is fixed to the front of the oven (1), and a locking device is fixed to the side wall of the oven (1), the locking device comprising: A connecting box (41) is fixed to the side wall of the oven (1). A piston plate (43) is slidably installed on the inner side of the connecting box (41). Carbon dioxide gas is added to the connecting box (41) on the right side of the piston plate (43). A copper rod (42) has one end that passes through the side wall of the connecting box (41) and is fixedly connected at the point of penetration. The other end of the copper rod (42) passes through the side wall of the oven (1) and is fixedly connected at the point of penetration. A return spring (44) is fixed to the side wall of the piston plate (43). The side of the return spring (44) away from the piston plate (43) is fixed to the inside of the connecting box (41). A guide block (411) is slidably mounted on the inner side of the connecting box (41). A connecting spring (412) is fixed on the side wall of the guide block (411). The side of the connecting spring (412) away from the guide block (411) is fixed on the inner side of the connecting box (41). A sleeve rod (47) is fixed at the bottom of the guide block (411). A sleeve (45) is slidably mounted on the outer wall of the sleeve rod (47). The locking block (48) passes through the side wall of the connecting box (41) and is slidably connected at the through point. The locking block (48) has an inclined groove (49) on its outside. The sleeve rod (47) has a pressing rod (410) fixed on its outer wall. The end of the pressing rod (410) fits against the inner side of the inclined groove (49). By setting the locking block (48), the box door (2) can be locked so that the box door (2) cannot be opened under high temperature conditions.
2. The drying oven for drying metal powders for powder metallurgy according to claim 1, characterized in that, A return spring (46) is fixed to the end of the sleeve (47), and the end of the return spring (46) away from the sleeve (47) is fixed to the inside of the sleeve (45).
3. The drying oven for drying metal powders for powder metallurgy according to claim 2, characterized in that, The connecting box (41) is provided with a prompting device, which is used to remind the staff to prevent burns. The side wall of the oven (1) is provided with an exhaust device, which is used to exhaust the hot air in the oven (1). The bottom of the exhaust device is provided with a cooling device.
4. The drying oven for drying metal powders for powder metallurgy according to claim 3, characterized in that, The prompting device includes an L-shaped block (501), which is fixed to the outer wall of the sleeve rod (47); The prompting plate (504) runs through the upper and lower sides of the connecting box (41) and is slidably connected at the through point. A triangular block (502) is fixed at the end of the prompting plate (504).
5. The drying oven for drying metal powders for powder metallurgy according to claim 4, characterized in that, The inclined surface of the triangular block (502) is provided with a sliding groove, and a hinge block (503) is slidably installed on the inner side of the sliding groove. The side wall of the hinge block (503) is hinged to the end of the L-shaped block (501).
6. The drying oven for drying metal powders for powder metallurgy according to claim 5, characterized in that, The exhaust device includes: a transmission column (601), which passes through the side wall of the connecting box (41) and is slidably connected at the passage, and an extrusion plate (603) is fixed at the end of the transmission column (601). A transmission spring (602) is fixed on one side of the extrusion plate (603) and on the other side of the connecting box (41). A support plate (604) is fixed to the side wall of the connecting box (41), and a pressure sensor (605) is fixed to the outer wall of the support plate (604). The pressure sensor (605) is electrically connected to the control panel (3).
7. The drying oven for drying metal powders for powder metallurgy according to claim 6, characterized in that, An exhaust pipe (606) is passed through the side wall of the oven (1) and is fixedly connected at the point of penetration. A solenoid valve (607) is fixed to the outer wall of the exhaust pipe (606). The solenoid valve (607) is electrically connected to the control panel (3). A thin tube (608) is fixed to the end of the exhaust pipe (606).
8. The drying oven for drying metal powders for powder metallurgy according to claim 7, characterized in that, The cooling device includes: a water storage box (701), which is fixed to the side wall of the oven (1), and a square block (704) is fixed to the top of the water storage box (701). The bottom of the thin tube (608) is fixedly connected to the top of the square block (704), and the thin tube (608) communicates with the inside of the square block (704). An air inlet pipe (705) is fixed to the bottom of a square block (704), and the square block (704) is connected to the air inlet pipe (705). The air inlet pipe (705) passes through the top of the water storage box (701), and the passage is fixedly connected. An air outlet pipe (702) is fixed to the top of the water storage box (701). A connecting pipe (709) is fixed to the side wall of the water storage box (701), and a valve is provided on the connecting pipe (709). A connecting pipe (703) is fixed to the side wall of the square block (704) and the connecting pipe (703) is connected to the square block (704).
9. An oven for drying metal powders for powder metallurgy according to claim 8, characterized in that, A first baffle (707) is inserted through the side wall of the square block (704) and is slidably connected at the insertion point. A bolt (706) is rotatably installed on the side wall of the first baffle (707) and is threaded through the side wall of the square block (704). A second baffle (708) is fixed at the bottom of the first baffle (707) and is inserted through the side wall of the square block (704) and is slidably connected at the insertion point. By setting the first baffle (707) and the second baffle (708), the position of hot gas emission can be switched.