Low temperature tempering kiln

Abstract

The application provides a low-temperature tempering kiln, which comprises a furnace body, two flow guides and an air guide assembly. A heating unit is mounted on the side wall of the furnace body, and a ventilation hole is formed in the top of the furnace body. The two flow guides are respectively arranged on the opposite sides of the inner cavity of the furnace body and form a flow guide channel together with the corresponding side wall of the furnace body. A plurality of flow guides form a material cavity, which is in communication with the ventilation hole and the bottom opening of the flow guide channel. The air guide assembly is mounted on the top of the furnace body and comprises an air inlet pipe which penetrates through the furnace body and is in communication with the top of the flow guide channel. The low-temperature tempering kiln can make the cooling air flow regularly, sequentially pass through the air inlet pipe, the flow guide channel, the material cavity and the ventilation hole, and fully exchange heat with the workpiece in the material cavity, so that the uniform cooling of the workpiece is realized and the cooling efficiency of the workpiece is improved.

Description

Technical Field

[0001] This application belongs to the field of tempering furnace cooling technology, specifically relating to a low-temperature tempering furnace. Background Technology

[0002] Tempering is a heat treatment process for metals, which involves heating a quenched workpiece, holding it at that temperature for an appropriate time, and then cooling it to room temperature. The purpose of tempering is to eliminate quenching stress, transform the workpiece's microstructure into a relatively stable state, and improve the workpiece's plasticity and toughness without reducing or only appropriately reducing its hardness and strength. Depending on the requirements, low-temperature, medium-temperature, or high-temperature tempering can be used, and a tempering furnace is required for tempering.

[0003] Currently, most low-temperature tempering furnaces use electric rotary kilns for workpiece heat treatment. After tempering and holding, the rotary kiln is powered off, and the workpiece cools naturally with the furnace. However, the natural cooling time in the tempering furnace is long, and the workpiece cools slowly, far below the safe cooling rate, resulting in long production cycles and low production efficiency. If the kiln door is opened for cooling, it can cause localized, excessively rapid cooling of the workpiece, leading to uneven temperature distribution, the risk of cracking, and impacting production quality. Utility Model Content

[0004] This application provides a low-temperature tempering kiln, which aims to solve the technical problems existing in the prior art, such as long heat dissipation cycle of workpieces, low heat dissipation efficiency, and easy cracking of workpieces due to uneven workpiece temperature when the kiln door is opened.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] A low-temperature tempering furnace is provided, comprising:

[0007] The furnace body has heating units installed on its side walls, and ventilation holes are provided on the top of the furnace body.

[0008] Two guide plates are respectively placed on opposite sides of the furnace body cavity, forming a flow channel with the corresponding side wall of the furnace body. The heating unit is placed within the flow channel. Multiple guide plates form a material cavity for holding the workpiece. The material cavity is connected to the vent hole and the bottom opening of the flow channel.

[0009] An exhaust fan assembly is installed on the top of the furnace body. The exhaust fan assembly includes an air inlet pipe that passes through the furnace body and is connected to the top of the flow channel. Cooling air flows sequentially along the air inlet pipe, the flow channel, the material chamber, and the vent hole, and exchanges heat with the workpiece in the material chamber.

[0010] In one possible implementation, the furnace body specifically includes:

[0011] The furnace plate is enclosed to form a box-shaped structure, with openings on one side and top of the box-shaped structure. The guide plate is parallel to the furnace plate opposite to it, and the heating unit is located between the furnace plate and the corresponding guide plate.

[0012] The furnace top, covering the top opening of the box-shaped structure, has ventilation holes located on the furnace top; and

[0013] A sealing plate, removably sealing the side opening of the box-shaped structure.

[0014] In one possible implementation, the induced draft assembly further includes an induced draft fan disposed inside the air inlet pipe, the air inlet end of the air inlet pipe being connected to a ventilation pipe on the tempering furnace working line, and the air outlet end of the air inlet pipe being connected to the induced flow channel.

[0015] In one possible implementation, the lower end of the guide plate has multiple air inlets, the opening direction of the air inlets is parallel to the vertical direction, the air inlets are respectively connected to the material chamber and the flow channel, and the air inlets form the bottom opening of the flow channel.

[0016] In one possible implementation, a drainage fan is provided at the top of the material chamber, the drainage fan being used to guide gas out of the material chamber through the vent.

[0017] In one possible implementation, the low-temperature tempering furnace further includes a temperature control mechanism, the temperature control mechanism comprising:

[0018] A processing unit, installed on the top of the furnace body, is communicatively connected to the induced draft fan; and

[0019] Multiple temperature sensors are installed at intervals along the vertical direction on the inner side of the guide plate, and each of the multiple temperature sensors is communicatively connected to the processing unit.

[0020] In one possible implementation, the bottom of the furnace body is provided with a wind baffle block, the wind baffle block having a wind baffle slope that gradually approaches the material cavity from top to bottom, and a ventilation gap is formed between the bottom of the guide plate and the wind baffle slope, the ventilation gap forming the bottom opening of the flow channel.

[0021] In one possible implementation, the furnace body further includes a lifting seat and a lifting assembly. The lifting seat is located on the top of the furnace, and the lifting assembly is installed on the lifting seat. The bottom end of the lifting assembly is connected to the sealing plate to drive the sealing plate to move up and down.

[0022] In one possible implementation, the lifting assembly includes a lift with a lifting end at its bottom, the lifting end passing through the lifting seat and connected to the top of the sealing plate.

[0023] In one possible implementation, pulleys are provided at the bottom of both sides of the sealing plate, and vertically extending slide rails are provided on the corresponding sides of the furnace plate, with the slide rails and pulleys sliding together vertically.

[0024] Compared with existing technologies, the low-temperature tempering kiln provided in this application introduces cold air through the air inlet pipe. The cold air moves to the bottom of the furnace body along the guide channel. During this movement, the cold air is heated by the heating unit. The heated cold air then enters the material chamber from the bottom of the furnace body upwards, exchanging heat with the workpieces inside. The heat-exchanged air is discharged through the vent, completing one cooling cycle for the workpieces. Continuous cooling of the workpieces is achieved through continuous air intake. By setting up the guide channel and air intake assembly, the cooling air can flow regularly, passing through the air inlet pipe, guide channel, material chamber, and vent, fully exchanging heat with the workpieces in the material chamber, achieving uniform cooling of the workpieces. This avoids the problems of long natural cooling time and slow cooling rate, improving the cooling efficiency of the workpieces. The entire process does not require opening the kiln door, and the workpieces do not experience localized excessively rapid cooling, effectively improving production efficiency and quality. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a low-temperature tempering furnace provided in one embodiment of this application;

[0027] Figure 2 This is a front view of a low-temperature tempering furnace used in an embodiment of this application;

[0028] Figure 3 This is a cross-sectional view of the furnace body used in one embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the structure of a low-temperature tempering furnace used in another embodiment of this application;

[0030] Figure 5 This is a front view of a low-temperature tempering furnace used in another embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Furnace body; 10. Material chamber; 11. Furnace plate; 111. Slide rail; 12. Furnace top; 13. Sealing plate; 131. Pulley; 14. Heating unit; 15. Drainage fan; 16. Wind baffle; 17. Vent hole;

[0033] 2. Guide vane; 20. Airflow channel; 21. Air intake hole;

[0034] 3. Exhaust fan assembly; 31. Air inlet duct;

[0035] 4. Temperature control mechanism; 41. Temperature sensor;

[0036] 5. Lifting assembly; 51. Lifting base; 52. Lifting machine;

[0037] 6. Ventilation duct. Detailed Implementation

[0038] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0042] It should be noted that the terms "length," "width," "height," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0043] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0046] Please refer to the following: Figures 1 to 5 The low-temperature tempering furnace provided in this application is described below. The low-temperature tempering furnace includes a furnace body 1, two guide plates 2, and an induced draft assembly 3. Heating units 14 are installed on the side walls of the furnace body 1, and vent holes 17 are opened on the top of the furnace body 1. The two guide plates 2 are respectively placed on opposite sides of the inner cavity of the furnace body 1, and form an induced draft channel 20 with the corresponding side walls of the furnace body 1. The heating units 14 are placed in the induced draft channel 20. Multiple guide plates 2 form a material cavity 10 for holding workpieces. The material cavity 10 is connected to the vent holes 17 and the bottom opening of the induced draft channel 20. The induced draft assembly 3 is installed on the top of the furnace body 1. The induced draft assembly 3 includes an air inlet pipe 31, which penetrates the furnace body 1 and is connected to the top of the induced draft channel 20. Cooling air flows sequentially along the air inlet pipe 31, the induced draft channel 20, the material cavity 10, and the vent holes 17, and exchanges heat with the workpiece in the material cavity 10.

[0047] It should be noted that the principle of use of this application is as follows: (See below) Figure 3 Cold air is introduced from the air inlet pipe 31 and moves to the bottom of the furnace body 1 along the flow channel 20. During the movement, the cold air is heated by the heating unit 14. The heated cold air enters the material chamber 10 from the bottom of the furnace body 1 from bottom to top and exchanges heat with the workpiece in the material chamber 10. The heat-exchanged gas is discharged from the vent 17, completing one cooling of the workpiece. The continuous cooling of the workpiece is achieved by continuous air intake. The whole process does not require opening the kiln door, which can improve the cooling efficiency.

[0048] It should be noted that the guide plate 2 is made of steel or stainless steel and does not affect the normal heating of the material chamber 10 by the heating unit 14.

[0049] It should be noted that the tempering furnace used in this application is a low-temperature electric tempering furnace, and the tempering temperature of the tempering furnace is 50-250℃.

[0050] It should be noted that the cold air is heated by the heating unit 14 in the flow channel 20 to avoid the cold air temperature entering the material chamber 10 being too different from the workpiece, which could cause cracks in the workpiece.

[0051] It should be noted that the heating unit 14 is a resistance wire, which is electrically connected to an external power source. When the resistance wire is energized, it heats up and heats the material chamber 10 for tempering.

[0052] Compared with the prior art, the low-temperature tempering kiln provided in this embodiment, by setting up the flow channel 20 and the air intake assembly 3, allows the cooling air to flow regularly, passing through the air inlet pipe 31, the flow channel 20, the material chamber 10 and the vent 17 in sequence. It fully exchanges heat with the workpiece in the material chamber 10, achieving uniform cooling of the workpiece. This avoids the problems of long natural cooling time and slow cooling speed, and improves the cooling efficiency of the workpiece. The whole process does not require opening the kiln door, and the workpiece will not experience localized excessively rapid cooling, effectively improving production efficiency and production quality.

[0053] In some embodiments, see Figures 1 to 4 The furnace body 1 specifically includes a furnace plate 11, a furnace top 12, and a sealing plate 13. The furnace plate 11 forms a box-shaped structure with openings on one side and the top. A guide plate 2 is parallel to the corresponding furnace plate 11, and a heating unit 14 is positioned between the furnace plate 11 and the corresponding guide plate 2. The furnace top 12 covers the top opening of the box-shaped structure, and a vent 17 is opened in the furnace top 12. The sealing plate 13 is detachably used to seal the side opening of the box-shaped structure, thereby sealing the material chamber 10. The furnace body 1 of this embodiment adopts a structural design of furnace plate 11, furnace top 12, and sealing plate 13, which facilitates the placement and removal of workpieces while ensuring the sealing of the material chamber 10. This design promotes the circulation and heat exchange of cooling air within the material chamber 10, improving the cooling effect.

[0054] For specific implementation, please refer to Figure 1 and Figure 2 There are three furnace plates 11, which are enclosed to form a box-shaped structure. Each furnace plate 11 has a heating unit 14 installed on its inner side wall. Two guide plates 2 are located on the inner side of two opposite furnace plates 11. The furnace top 12 covers the top of the furnace plates 11. The two ends of the sealing plate 13 are connected to the two furnace plates 11 respectively.

[0055] In some embodiments, a mounting frame is provided inside the furnace body 1. The mounting frame and the side of the guide plate 2 are welded and fixed. The mounting frame is a vertically arranged steel pipe or steel bar, which does not occupy space.

[0056] As one way of assembling the furnace plate 11 and the guide plate 2, the inner sidewall of the furnace plate 11 is recessed to form an installation groove, and the guide plate 2 is installed at the opening of the installation groove without occupying additional internal space of the furnace body 1.

[0057] In some embodiments, the induced draft assembly 3 further includes an induced draft fan disposed within the air inlet pipe 31. The air inlet end of the air inlet pipe 31 is connected to the ventilation pipe 6 on the tempering furnace working line, and the air outlet end of the air inlet pipe 31 is connected to the induced flow channel 20. The induced draft fan in the induced draft assembly 3 is disposed within the air inlet pipe 31, and the air inlet pipe 31 is connected to the ventilation pipe 6 on the tempering furnace working line. This allows the use of ventilation resources on the working line to provide a stable cooling air source for the cooling device, reducing energy consumption.

[0058] In practice, a centrifugal induced draft fan is used, which is installed inside the air inlet duct 31 and electrically connected to an external power source. An axial flow induced draft fan or a crossflow induced draft fan can also be used.

[0059] It should be noted that the ventilation pipe 6 installed above the working line of the tempering furnace is existing technology. The ventilation pipe 6 is installed on the working line, and cooling air flows in the ventilation pipe 6, which can provide cold air to the areas that need to be cooled, thereby achieving air cooling.

[0060] As one way to connect the induced draft fan and the air inlet pipe 31, the induced draft fan is installed at the air inlet of the air inlet pipe 31.

[0061] In some embodiments, see Figure 1 The lower end of the guide plate 2 has multiple air inlets 21, with the opening direction of the air inlets 21 parallel to the vertical direction. The air inlets 21 are connected to the material chamber 10 and the flow channel 20, respectively, forming the bottom opening of the flow channel 20. The air inlets 21 at the lower end of the guide plate 2 allow the cooling air in the flow channel 20 to enter the material chamber 10 more evenly, further enhancing the uniformity of the cooling air flow in the material chamber 10 and improving the cooling effect of the workpiece.

[0062] The air inlet 21 is located at the bottom of the guide plate 2. On the one hand, it can guide the cold air from bottom to top into the material chamber 10, forming convection from bottom to top to ensure that the workpiece is heated evenly. On the other hand, the back opening can disperse the stress of the guide plate 2 during tempering, and provide space for thermal expansion of the guide plate 2 to prevent deformation or cracking caused by thermal expansion and contraction.

[0063] As a specific arrangement of the air inlet 21, multiple air inlets 21 are arranged at intervals along the direction away from the surface of the sealing plate 13, and each air inlet 21 extends in the vertical direction.

[0064] In some embodiments, see Figure 2 A ducting fan 15 is provided at the top of the material chamber 10. The ducting fan 15 is used to guide gas out of the material chamber 10 through the vent 17. The ducting fan 15 at the top of the material chamber 10 can guide gas out of the material chamber 10 through the vent 17, accelerate the circulation of cooling air, and improve cooling efficiency.

[0065] As one installation method for the venting fan 15 and the vent 17, there are six vents 17, distributed in groups of three on both sides of the furnace top 12. There are three venting fans 15, with three venting fans 15 installed between two groups of vents 17 and one venting fan 15 installed in the middle of the corresponding two vents 17.

[0066] In practice, the guide fan 15 blows air downwards, which mixes the cold air entering the material chamber 10 from the bottom opening of the guide plate 2. This ensures that the cold air temperature is the same for all parts of the workpiece in the material chamber 10, avoiding uneven temperature and ensuring the heat exchange quality of the cold air. After the cold air is fully mixed and exchanges heat with the workpiece, it is discharged from the vent 17.

[0067] In some embodiments, see Figure 2 The low-temperature tempering furnace also includes a temperature control mechanism 4, which comprises a processing unit and multiple temperature sensors 41. The processing unit is installed on the top of the furnace body 1 and is communicatively connected to the induced draft fan. The multiple temperature sensors 41 are installed vertically at intervals on the inner side of the guide plate 2, and each temperature sensor 41 is communicatively connected to the processing unit. The temperature control mechanism 4 monitors the temperature inside the furnace body 1 in real time through the temperature sensors 41 and feeds the temperature information back to the processing unit. The processing unit controls the operation of the induced draft fan according to the temperature conditions, achieving precise temperature control of the cooling process and ensuring the cooling quality of the workpiece.

[0068] Specifically, multiple temperature sensors 41 are arranged on the guide plate 2 in the vertical direction to detect the temperature of the material chamber 10 at different heights, so as to avoid uneven temperature distribution inside the material chamber 10.

[0069] Temperature sensor 41 uses a thermocouple sensor, such as the SY-50 series sensor from RKC Japan, or a WZ series thermocouple sensor, and is threaded onto the guide plate 2.

[0070] In some embodiments, see Figures 1 to 3The bottom of the furnace body 1 is provided with a baffle block 16. The baffle block 16 has a baffle slope that gradually approaches the material cavity 10 from top to bottom. A ventilation gap is formed between the bottom of the guide plate 2 and the baffle slope, and the ventilation gap forms the bottom opening of the flow channel 20. The baffle block 16 and its baffle slope at the bottom of the furnace body 1 can change the flow direction of the cooling air, so that the cooling air changes its angle and enters the material cavity 10 from the bottom at an angle, thereby improving the utilization rate and cooling effect of the cooling air.

[0071] In practice, the air inlet 21 and the gap allow air to pass through together, dispersing the pressure of the cold air and extending the service life of the wind deflector 16.

[0072] In some embodiments, see Figure 4 The furnace body 1 also includes a lifting seat 51 and a lifting assembly 5. The lifting seat 51 is located on the furnace top 12, and the lifting assembly 5 is installed on the lifting seat 51. The bottom end of the lifting assembly 5 is connected to the sealing plate 13 to drive the sealing plate 13 to move up and down. The lifting seat 51 and the lifting assembly 5 enable the sealing plate 13 to move up and down, facilitating the loading and unloading of workpieces and improving the convenience of operation and work efficiency.

[0073] It should be noted that the sealing plate 13 in this embodiment is a roller shutter. The sealing plate 13 can be rolled up and retracted, or it can be lowered to seal the material cavity 10.

[0074] In some embodiments, see Figure 4 and Figure 5 The lifting assembly 5 includes a lifting platform 52, with a lifting end at the bottom of the lifting platform 52. The lifting end passes through the lifting seat 51 and is connected to the top of the sealing plate 13. By using the lifting platform 52 as the lifting assembly 5, the lifting height of the sealing plate 13 can be precisely controlled, ensuring that the opening and closing operations of the sealing plate 13 are accurate and reliable.

[0075] It should be noted that the elevator 52 is a roller shutter door elevator, which drives the sealing plate 13 to roll up and down, thereby raising and lowering the bottom of the sealing plate 13.

[0076] In practice, a sealing gasket is installed at the contact point of the sealing plate 13 on the furnace body 1. The sealing gasket is attached to the side of the sealing plate 13 to increase the sealing performance of the sealing plate 13 and the furnace body 1, thereby increasing the sealing effect of the sealing cavity.

[0077] In some embodiments, see Figure 4 and Figure 5 The sealing plate 13 has pulleys 131 on both sides at its bottom, and the furnace plate 11 has vertically extending slide rails 111 on the corresponding sides. The slide rails 111 and pulleys 131 slide vertically together. The pulleys 131 on both sides of the sealing plate 13 cooperate with the slide rails 111 on the furnace plate 11, making the vertical movement of the sealing plate 13 smoother, reducing friction, and improving the service life and operational stability of the equipment.

[0078] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A low temperature tempering kiln characterized by, include: The furnace body has heating units installed on its side walls, and ventilation holes are provided on the top of the furnace body. Two guide plates are respectively placed on opposite sides of the inner cavity of the furnace body, and enclosed with the corresponding side wall of the furnace body to form a flow channel. The heating unit is placed in the flow channel. Multiple guide plates enclose to form a material cavity for holding the workpiece. The material cavity is connected to the vent hole and the bottom opening of the flow channel. as well as An exhaust fan assembly is installed on the top of the furnace body. The exhaust fan assembly includes an air inlet pipe that passes through the furnace body and is connected to the top of the flow channel. Cooling air flows sequentially along the air inlet pipe, the flow channel, the material chamber, and the vent hole, and exchanges heat with the workpiece in the material chamber.

2. The low-temperature tempering furnace as described in claim 1, characterized in that, The furnace body specifically includes: The furnace plate is enclosed to form a box-shaped structure, with openings on one side and top of the box-shaped structure. The guide plate is parallel to the furnace plate opposite to it, and the heating unit is located between the furnace plate and the corresponding guide plate. The furnace top, covering the top opening of the box-shaped structure, has ventilation holes located on the furnace top; and A sealing plate, removably sealing the side opening of the box-shaped structure.

3. The low-temperature tempering furnace as described in claim 1, characterized in that, The induced draft assembly also includes an induced draft fan, which is located inside the air inlet pipe. The air inlet end of the air inlet pipe is connected to the ventilation pipe on the tempering furnace working line, and the air outlet end of the air inlet pipe is connected to the induced flow channel.

4. The low-temperature tempering furnace as described in claim 1, characterized in that, The lower end of the guide plate has multiple air inlets, the opening direction of the air inlets is parallel to the vertical direction, the air inlets are connected to the material chamber and the flow channel respectively, and the air inlets form the bottom opening of the flow channel.

5. The low-temperature tempering furnace as described in claim 1, characterized in that, A flow fan is provided at the top of the material chamber, and the flow fan is used to guide gas out of the material chamber through the vent.

6. The low-temperature tempering furnace as described in claim 3, characterized in that, The low-temperature tempering furnace also includes a temperature control mechanism, the temperature control mechanism comprising: A processing unit, installed on the top of the furnace body, is communicatively connected to the induced draft fan; and Multiple temperature sensors are installed at intervals along the vertical direction on the inner side of the guide plate, and each of the multiple temperature sensors is communicatively connected to the processing unit.

7. The low-temperature tempering furnace as described in claim 1, characterized in that, The bottom of the furnace body is provided with a wind baffle block, which has a wind baffle slope that gradually approaches the material cavity from top to bottom. A ventilation gap is formed between the bottom of the guide plate and the wind baffle slope, and the ventilation gap forms the bottom opening of the flow channel.

8. The low-temperature tempering furnace as described in claim 2, characterized in that, The furnace body also includes a lifting seat and a lifting assembly. The lifting seat is located on the top of the furnace, and the lifting assembly is installed on the lifting seat. The bottom end of the lifting assembly is connected to the sealing plate to drive the sealing plate to move up and down.

9. The low-temperature tempering furnace as described in claim 8, characterized in that, The lifting assembly includes a lifting machine, the bottom of which is provided with a lifting end, which passes through the lifting seat and is connected to the top of the sealing plate.

10. The low-temperature tempering furnace as described in claim 8, characterized in that, The sealing plate has pulleys on both sides at the bottom, and the furnace plate has vertically extending slide rails on the corresponding sides, with the slide rails and pulleys sliding together vertically.

Images