A box-type resistance furnace for uniform heating

Abstract

The utility model relates to detection equipment technical field, concretely is a kind of even heating's box resistance furnace, the upper end of resistance furnace main body is equipped with control box, the upper end of resistance furnace main body is fixedly arranged with top seat, positioning frame and fan, vertical box is through top seat and resistance furnace main body and is slidably connected with top seat, the side of vertical box top is equipped with toothed plate, the top of positioning frame is fixedly arranged with first motor, the output of first motor is equipped with drive shaft located in the side of vertical box, drive gear is fixedly arranged on drive shaft, drive gear is located toothed plate side and is engaged with toothed plate, the height adjusting function of vertical box, air outlet hole can accurately adapt to the article of different height, avoid the airflow attenuation problem caused by traditional fixed air outlet hole;Combined with the rotating movement of article with the rotation of the board, completely eliminate the phenomenon that the article is locally heated unevenly, greatly improve the consistency of article heat treatment quality, can improve the efficiency and accuracy when subsequent article detection.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to a box-type resistance furnace for uniform heating. Background Technology

[0002] Box-type resistance furnaces (muffle furnaces) are used in various testing fields such as materials, food, and chemicals for core pretreatment or analysis functions such as "high-temperature decomposition, purification, and calcination" due to their controllable high-temperature environment (usually from room temperature to 1200℃, and some can reach 1800℃) and closed heating characteristics. They are key equipment for achieving component separation, impurity quantification, and structural characterization. When using them, the items to be tested need to be placed inside the furnace for heating.

[0003] Existing box-type resistance furnaces generally suffer from the following technical bottlenecks: the air outlets of their hot air circulation system are mostly fixed at the top of the chamber and cannot be adjusted. After the hot air is sent out of the air outlets, it gradually cools down during its propagation due to thermal radiation and heat dissipation from the furnace wall. By the time it reaches the surface of low-lying items, the wind speed and temperature have significantly decreased, resulting in insufficient heat gain from convection by the items. The heating rate is much lower than that of the area near the air outlets, prolonging the heating cycle and reducing the efficiency of subsequent testing. Furthermore, when items are placed still, they rely solely on thermal radiation and local convection for heat transfer. Due to the fixed relative positions of different parts of the same item with the heat source and airflow, significant temperature differences can easily occur between the sides and the front, affecting the accuracy of subsequent item testing. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a box-type resistance furnace for uniform heating.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a uniformly heated box-type resistance furnace, comprising a resistance furnace body and a vertical box, a furnace door at the front end of the resistance furnace body, heating tubes on the inner wall of the resistance furnace body, a control box at the upper end of the resistance furnace body, a top seat, a positioning frame, and a fan fixedly mounted at the upper end of the resistance furnace body, the vertical box penetrating the top seat and the resistance furnace body and slidably connected to the top seat, a toothed plate on one side of the top of the vertical box, a first motor fixedly mounted on the top of the positioning frame, a drive shaft located on one side of the vertical box at the output end of the first motor, a drive gear fixedly mounted on the drive shaft, the drive gear being located on one side of the toothed plate and meshing with the toothed plate;

[0008] The air outlet of the blower is connected to the vertical box through an air supply pipe. The bottom of the vertical box is provided with an air outlet plate located inside the main body of the resistance furnace, and the lower end of the air outlet plate is provided with multiple air outlet holes.

[0009] The resistance furnace body has a bottom plate inside, and an exhaust pipe is provided at the lower end of the resistance furnace body. The bottom plate is fixed to the bottom of the resistance furnace body and has multiple ventilation holes. A circular positioning plate is rotatably set in the middle part of the bottom plate through a bearing. A second motor is fixed at the lower end of the resistance furnace body. The output end of the second motor is connected to the axis of the circular positioning plate. A detachable support plate is provided at the upper end of the circular positioning plate.

[0010] To facilitate assembly of the toothed plate, the present invention is improved by fixing the toothed plate to the outer wall of the vertical box with screws.

[0011] To improve the stability of the vertical box during use, the present invention includes the following improvements: a positioning shaft is provided on the top of the positioning frame as a symmetrical drive shaft. The positioning shaft is located on the other side of the vertical box. Both ends of the positioning shaft are rotatably connected to the positioning frame through bearings. A limit wheel is fixedly provided on the positioning shaft, and the periphery of the limit wheel contacts the outer wall of the vertical box.

[0012] To improve the stability of the pallet during rotation, the present invention includes an improvement whereby the output end of the second motor is provided with a rotating shaft that penetrates the main body of the resistance furnace, and the top end of the rotating shaft is fixed to the lower end of the circular positioning plate.

[0013] To facilitate the replacement of the pallet, the present invention includes the following improvements: the lower end of the pallet is provided with a threaded rod that is inserted into the circular positioning plate, the threaded rod is threadedly connected to the circular positioning plate, and the pallet has a circular structure with anti-slip textures on its periphery and upper surface.

[0014] To ensure the sealing of the top seat, the improvement of this utility model is that the top seat is provided with a slot, the slot is penetrated by a vertical box, and a sealing ring penetrated by the vertical box is provided on the inner wall of the slot.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a box-type resistance furnace with uniform heating, which has the following beneficial effects:

[0017] With the height adjustment function of the vertical box, the air outlet can be precisely adapted to items of different heights, avoiding the airflow attenuation problem caused by traditional fixed air outlets; combined with the rotation of the items with the pallet, the phenomenon of uneven heating of the items is completely eliminated, which greatly improves the consistency of the heat treatment quality of the items and can improve the efficiency and accuracy of subsequent item inspection.

[0018] The tray features a detachable threaded connection design, allowing for quick replacement based on the shape and size of the items. Combined with an anti-slip textured structure, it meets diverse heating needs. Attached Figure Description

[0019] Figure 1 This is a first-view perspective three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a second-view perspective three-dimensional structural diagram of the present invention;

[0021] Figure 3 This utility model Figure 1 The main view;

[0022] Figure 4 This is an assembly drawing of the pallet in this utility model;

[0023] Figure 5 This is a schematic diagram of the installation structure of the sealing ring in this utility model;

[0024] In the diagram: 1. Main body of the resistance furnace; 2. Heating tube; 3. Furnace door; 4. Control box; 5. Fan; 6. Top base; 7. Vertical box; 8. Positioning frame; 9. Limiting wheel; 10. Positioning shaft; 11. First motor; 12. Drive shaft; 13. Drive gear; 14. Gear plate; 15. Air supply pipe; 16. Air outlet plate; 17. Exhaust pipe; 18. Base plate; 19. Circular positioning plate; 20. Support plate; 21. Second motor. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-5 This utility model discloses a box-type resistance furnace for uniform heating, comprising a furnace body 1 and a vertical box 7. The front end of the furnace body 1 is provided with a furnace door 3, and a heating tube 2 is provided on the inner wall of the furnace body 1. A control box 4 is provided at the upper end of the furnace body 1. A top seat 6, a positioning frame 8, and a fan 5 are fixedly provided at the upper end of the furnace body 1. The vertical box 7 passes through the top seat 6 and the furnace body 1 and is slidably connected to the top seat 6. A toothed plate 14 is provided on one side of the top of the vertical box 7. A first motor 11 is fixedly provided on the top of the positioning frame 8. A drive shaft 12 located on one side of the vertical box 7 is provided at the output end of the first motor 11. A drive gear 13 is fixedly provided on the drive shaft 12. The drive gear 13 is located on one side of the toothed plate 14 and meshes with the toothed plate 14.

[0027] The air outlet of the blower 5 is connected to the vertical box 7 through the air supply pipe 15. The bottom of the vertical box 7 is provided with an air outlet plate 16 located inside the resistance furnace body 1. The lower end of the air outlet plate 16 is provided with multiple air outlet holes.

[0028] The resistance furnace body 1 has a base plate 18 inside, and an exhaust pipe 17 is provided at the lower end of the resistance furnace body 1. The base plate 18 is fixed to the bottom of the resistance furnace body 1, and multiple ventilation holes are provided on the base plate 18. A circular positioning plate 19 is rotatably set in the middle part of the base plate 18 through a bearing. A second motor 21 is fixedly set at the lower end of the resistance furnace body 1. The output end of the second motor 21 is connected to the axis of the circular positioning plate 19. A detachable support plate 20 is provided at the upper end of the circular positioning plate 19.

[0029] The toothed plate 14 is fixed to the outer wall of the vertical box 7 by screws. The screw fixing method makes it easy to assemble the toothed plate 14 on the outer wall of the vertical box 7.

[0030] The output end of the second motor 21 is provided with a rotating shaft that passes through the main body 1 of the resistance furnace, and the top end of the rotating shaft is fixed to the lower end of the circular positioning plate 19.

[0031] Preparation phase:

[0032] The lower end of the tray 20 is provided with a threaded rod that is inserted into the circular positioning plate 19. The threaded rod is threadedly connected to the circular positioning plate 19. The tray 20 has a circular structure and anti-slip textures are provided on its periphery and upper surface.

[0033] After presetting the heating parameters via control box 4, open furnace door 3 and place the items to be processed stably onto tray 20. Tray 20 is fixed to the upper end of circular positioning plate 19 by a threaded connection and can be flexibly replaced according to the size of the items. Its anti-slip texture on the periphery makes the items more stable. After closing furnace door 3, the system automatically enters standby mode.

[0034] Air outlet height adjustment:

[0035] The top symmetrical drive shaft 12 of the positioning frame 8 is provided with a positioning shaft 10. The positioning shaft 10 is located on the other side of the vertical box 7. The two ends of the positioning shaft 10 are rotatably connected to the positioning frame 8 through bearings, and a limiting wheel 9 is fixedly provided on the positioning shaft 10. The periphery of the limiting wheel 9 contacts the outer wall of the vertical box 7.

[0036] The top seat 6 is provided with a slot, which is penetrated by the vertical box 7, and a sealing ring is provided on the inner wall of the slot, which is penetrated by the vertical box 7.

[0037] The first motor 11 is started, and the drive shaft 12 drives the drive gear 13 to rotate. Through the meshing transmission with the toothed plate 14, the vertical box 7 slides up and down along the empty groove of the top seat 6 until the height of the air outlet plate 16 is adapted to the size of the item. During the sliding process, the limiting wheel 9 on the positioning shaft 10 is in close contact with the outer wall of the vertical box 7 to ensure smooth movement; the sealing ring in the empty groove of the top seat 6 always maintains the sealing of the furnace body.

[0038] Heating cycle start-up:

[0039] The heating element 2 and the fan 5 are turned on. After the heating element 2 heats the air in the furnace, the fan 5 introduces the hot air into the vertical box 7 through the air supply pipe 15, and finally blows it evenly onto the items through the air outlet of the air outlet plate 16. At the same time, the second motor 21 is started, and its output end drives the circular positioning plate 19 to rotate through the rotating shaft, so that the pallet 20 carrying the items rotates at a uniform speed in the furnace, ensuring that all parts of the items can be fully contacted by the hot air.

[0040] Airflow balance control:

[0041] Excess hot air inside the furnace is collected through the vents in the bottom plate 18 and then discharged outside the furnace through the exhaust pipe 17, forming a stable hot air circulation. Throughout the process, the control box 4 monitors the operating status of each component in real time to ensure heating uniformity and operational safety.

[0042] Homework completed:

[0043] After the set process time is reached, the heating tube 2, the fan 5 and the second motor 21 are turned off in sequence. After the furnace temperature drops to a safe range, the furnace door 3 is opened to remove the items, completing the heating operation. Then, the heated items are taken to the designated location for testing.

[0044] The closed-loop airflow system consisting of fan 5, air supply pipe 15, air outlet plate 16 and exhaust pipe 17 accelerates the circulation of hot air and reduces heat loss; the sealing ring of top seat 6 and the structure of furnace door 3 together ensure the airtightness of the furnace, effectively maintain the stable temperature inside the furnace and reduce energy consumption.

[0045] The lateral restraint of the limit wheel 9 on the vertical box 7, the smooth rotation of the rotating shaft drive, and the real-time monitoring function of the control box 4 ensure the stability of equipment operation; multiple protection designs (such as sealing structure and temperature monitoring) reduce the safety risks of high-temperature operation and extend the service life of the equipment.

[0046] This design addresses the inherent shortcomings of traditional box-type resistance furnaces through structural innovation, improving heating quality and testing efficiency while also ensuring ease of operation and equipment durability.

[0047] Control Box 4: Brands such as Siemens and Omron are suitable for industrial automation. Taking the Siemens S7-200 SMART series as an example, the CPU module selected is the SR40 model, which has 24 digital input points and 16 digital output points, and can meet the control requirements of various motors, heating tubes 2, fans 5 and other equipment.

[0048] Fan 5: A centrifugal circulating fan is selected, model DF4-72No3.2A, with an air volume of 3000m³. 3 With an air pressure of 1000-1500Pa and a motor power of 2.2-3kW, it can ensure efficient circulation of hot air inside the furnace, making the furnace temperature uniformity ≤±3℃.

[0049] Limiting wheel 9: It adopts a polyurethane coated wheel. The polyurethane material has good wear resistance and cushioning performance, which can reduce the wear on the outer wall of the vertical box 7, while ensuring the stability of the vertical box 7 when sliding.

[0050] First motor 11: Use a servo motor, and brands such as Panasonic and Delta can be selected.

[0051] Second motor 21: Select a three-phase asynchronous motor, such as Siemens or ABB.

[0052] Air supply duct 15: Made of high-temperature resistant silicone cloth composite flexible hose with an internal spiral steel wire skeleton reinforcement structure. The material is glass fiber cloth coated with silicone rubber, which has excellent high and low temperature resistance (-60℃ to 260℃), flexibility and aging resistance, and can be bent at will without being easily deformed.

[0053] In the description herein, it should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] Although embodiments of the present 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 present invention.

Claims

1. A uniformly heated box-type resistance furnace, comprising a furnace body (1) and a vertical box (7), wherein a furnace door (3) is provided at the front end of the furnace body (1), heating tubes (2) are provided on the inner wall of the furnace body (1), and a control box (4) is provided at the upper end of the furnace body (1), characterized in that: The upper end of the resistance furnace body (1) is fixedly provided with a top seat (6), a positioning frame (8) and a fan (5). The vertical box (7) passes through the top seat (6) and the resistance furnace body (1) and is slidably connected to the top seat (6). A toothed plate (14) is provided on one side of the top of the vertical box (7). A first motor (11) is fixedly provided on the top of the positioning frame (8). The output end of the first motor (11) is provided with a drive shaft (12) located on one side of the vertical box (7). A drive gear (13) is fixedly provided on the drive shaft (12). The drive gear (13) is located on one side of the toothed plate (14) and meshes with the toothed plate (14). The air outlet of the blower (5) is connected to the vertical box (7) through the air supply pipe (15). The bottom of the vertical box (7) is provided with an air outlet plate (16) located inside the resistance furnace body (1). The lower end of the air outlet plate (16) is provided with multiple air outlet holes. The resistance furnace body (1) is provided with a bottom plate (18) inside. The lower end of the resistance furnace body (1) is provided with an exhaust pipe (17). The bottom plate (18) is fixed to the bottom of the resistance furnace body (1) and has multiple ventilation holes. The middle part of the bottom plate (18) is provided with a circular positioning plate (19) through a bearing. The lower end of the resistance furnace body (1) is fixed with a second motor (21). The output end of the second motor (21) is connected to the axis of the circular positioning plate (19). The upper end of the circular positioning plate (19) is provided with a detachable support plate (20).

2. The box-type resistance furnace for uniform heating according to claim 1, characterized in that: The toothed plate (14) is fixed to the outer wall of the vertical box (7) by screws.

3. The box-type resistance furnace for uniform heating according to claim 2, characterized in that: The top symmetrical drive shaft (12) of the positioning frame (8) is provided with a positioning shaft (10). The positioning shaft (10) is located on the other side of the vertical box (7). The two ends of the positioning shaft (10) are rotatably connected to the positioning frame (8) through bearings. A limiting wheel (9) is fixedly provided on the positioning shaft (10). The periphery of the limiting wheel (9) contacts the outer wall of the vertical box (7).

4. A box-type resistance furnace for uniform heating according to claim 3, characterized in that: The output end of the second motor (21) is provided with a rotating shaft that passes through the main body (1) of the resistance furnace, and the top end of the rotating shaft is fixed to the lower end of the circular positioning plate (19).

5. A box-type resistance furnace for uniform heating according to claim 4, characterized in that: The lower end of the tray (20) is provided with a threaded rod that is inserted into the circular positioning plate (19), and the threaded rod is threadedly connected to the circular positioning plate (19).

6. A box-type resistance furnace for uniform heating according to claim 5, characterized in that: The tray (20) has a circular structure, and its periphery and upper surface are provided with anti-slip texture.

7. A box-type resistance furnace for uniform heating according to claim 6, characterized in that: The top seat (6) is provided with a slot, which is penetrated by the vertical box (7), and a sealing ring is provided on the inner wall of the slot through which the vertical box (7) penetrates.

Images