Automatic lifting oven

Abstract

The invention relates to the field of baking equipment, in particular to an automatic lifting baking oven which comprises a baking oven body, and a fixing rod for fixing materials and a lifting assembly connected with the fixing rod and driving the fixing rod to convey are arranged in the baking oven body. A plurality of temperature zones are arranged in the oven body, and the lifting assembly drives materials to sequentially pass through the temperature zones from bottom to top through fixing rods. The lifting assembly comprises closed-loop chains symmetrically arranged on the inner walls of the two sides of the drying oven body, each chain comprises an ascending section and a descending section, the ascending sections are arranged in an S-shaped bent mode, and the descending sections are vertically arranged. A plurality of fixing devices are connected to the chains, and the two ends of the fixing rod are connected with the fixing devices on the chains on the two sides respectively. Materials are carried on the fixing rod, and the two ends of the fixing rod are fixed in the buckles; along with the rotation of the chain, materials enter from the material port and are upwards conveyed along the S shape when passing through the ascending section, so that the materials sequentially stay in each temperature area for enough time for processing.

Description

Technical Field

[0001] The invention relates to the technical field of baking equipment, in particular to an automatic lifting baking box. Background Art

[0002] Baking process is a commonly used technical means for processing materials. For example, in the preparation process of grains, Chinese herbal medicines, tobacco leaves, etc., it is necessary to heat them at different temperatures in the baking equipment once or multiple times to make the materials dry or ferment, so as to facilitate the storage of the materials or obtain better medicinal properties or flavors or avoid losses caused by weather changes. In the field of tobacco leaf preparation, the application of baking process is particularly critical. For example, in the preparation of tobacco leaves, fresh tobacco leaves need to be dried at different temperatures in turn to make the tobacco leaves wilt, turn yellow and soften, and dry, so as to achieve the purpose of obtaining tobacco leaves with better flavor.

[0003] Specifically, the materials are transferred in sequence in a plurality of baking devices with different temperature settings, or in the same baking device, different temperatures are set in sequence according to the baking time or material state to achieve the purpose of different temperature control. In the prior art, different temperature zones are set in the same baking device, and the materials are transferred in different zones inside the baking device to achieve the purpose of material baking. Compared with the traditional baking method, the material transfer process can be reduced, and the materials can be continuously loaded and unloaded, which greatly increases the efficiency of material baking.

[0004] However, in the prior art, when baking leaf materials, the fresh leaves are usually neatly stacked and fixed on fixed rods and transported by conveying devices such as chains. The following problems are encountered during the operation: 1. Equipment volume and site occupancy: In order to allow leaf materials to obtain sufficient baking time in different temperature zones, the baking equipment is usually designed to be larger and requires a larger site; 2. Uneven heating of materials: The material transmission time interval changes, resulting in the gap between two adjacent groups of fresh leaves being larger and smaller, affecting the stability of the gas flow inside the baking equipment, and further causing uneven heating of the materials; 3. Operation efficiency and labor intensity: During the baking process, new materials are constantly placed and the baked materials are taken out at a fast pace. In the process of placing and removing materials, it is also necessary to continuously open and lock the fixing device of the fixed rod, which further affects the efficiency. At the same time, the labor intensity of the operator is relatively high. The problem of large equipment footprint is reduced by setting up vertical temperature distribution areas in the oven; the problem of unstable material spacing during transmission is solved by rotating the fixing device and the chain and setting up a counterweight device; when taking and placing materials, the locking part can be automatically opened or locked with the movement of the material, thereby solving the problem of low operating efficiency when taking and placing materials. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic lifting baking oven, which reduces the problem of large equipment footprint by arranging vertical temperature distribution areas in the oven; solves the problem of unstable material spacing during transportation by rotatably connecting a fixing device with a chain and arranging a counterweight device; and solves the problem of low operating efficiency when taking and placing materials by arranging an automatic locking and opening device in the fixing device, so that the locking part can be automatically opened or locked with the movement of the material when taking and placing materials.

[0006] The technical solution of the present invention is: an automatic lifting baking oven, comprising an oven body, a fixing rod for fixing materials, and a lifting assembly connected to the fixing rod and driving the fixing rod to transport; a plurality of temperature zones are arranged in the oven body, and the lifting assembly drives the materials to pass through each temperature zone from bottom to top in sequence through the fixing rod;

[0007] The lifting assembly includes a closed-loop chain symmetrically arranged at the inner walls on both sides of the oven body, the chain includes an ascending section and a descending section, the ascending section is bent in an S shape, and the descending section is vertically arranged; a plurality of fixing devices are connected to the chain, and the two ends of the fixing rod are respectively connected to the fixing devices on the chains on both sides. After clamping the fresh leaves, the fixing rod is transmitted upward along the S shape, so that the fresh leaves can stay in different temperature zones for a longer time to ensure the drying effect. In the partition setting, the size of different partition areas can also be set to ensure the baking time in different temperature areas.

[0008] Preferably, the fixing device is rotatably connected to the chain, and includes a locking portion and a counterweight portion. The torque at the end where the counterweight portion is located is greater than the torque at the end where the locking portion is located, so that the counterweight portion is located below the locking portion. The distance between the counterweight portion and the fixed seat can be adjusted by adjusting the position of the counterweight portion to adjust its torque to ensure the stability of the transmission process. The provision of the counterweight portion in the fixing device can ensure that the material is always directly above the fixed seat during the entire transmission process, thereby avoiding shaking during material transmission, and at the same time, the distance between the materials on adjacent fixed rods remains unchanged or is maintained in a smaller floating range, so as to ensure that the flow of hot air in the oven box is more uniform.

[0009] Preferably, the fixing device comprises a fixing seat rotatably connected to the chain, the locking portion is arranged above the fixing seat, and the counterweight portion is arranged below the fixing seat; and the fixing rod is connected to the locking portion.

[0010] Preferably, a guide rod is connected below the locking portion, and the lower end of the guide rod passes through the fixing seat and is connected to the counterweight portion;

[0011] The guide rod is sleeved with a first spring, and the first spring is arranged between the fixing seat and the locking portion.

[0012] Preferably, the locking portion comprises a U-shaped card slot and a card cover rotatably connected to the card slot, the card cover and the card slot together form an annular buckle, and the fixing rod is arranged in the buckle;

[0013] The card cover is connected with a second spring near the rotation connection between the card cover and the card slot, and one end of the second spring away from the card cover is connected with the guide rod.

[0014] Preferably, the fixing seat is connected with a support plate, and when the card cover and the card slot rotate relative to each other to open the buckle, the card cover contacts the support plate. In the fixing device, when the card cover is opened, its back side contacts the support plate to limit the travel; when the fixing rod is placed, the card slot and the card cover move downward relative to the fixing seat, so that the support plate pushes the card cover upward, and at the same time, under the pulling force of the second spring, the card cover rotates in the opposite direction to reset and connects with the card slot to form a buckle, automatically fixing the fixing rod; at the same time, the fixing rod presses the pressure rod downward, and the pressure rod moves downward relative to the guide rod, and then the second spring is stretched downward through the fixing pin, so that the card cover and the card slot are buckled more tightly; the automatic buckling and locking of the fixing device is realized.

[0015] Preferably, a pressure rod is provided through the guide rod, a support plate is provided at the upper end of the pressure rod, and the support plate is provided in the card slot;

[0016] The guide rod is provided with a vertical long strip hole, the lower end of the pressure rod is connected with a fixing pin, and the fixing pin is arranged in the long strip hole; the second spring is connected to the fixing pin. When the fixing rod is taken out, the card slot and the card cover move upward relative to the support plate with the help of the elastic force of the first spring, so that there is enough space for the card cover to be opened; at the same time, the pressure rod moves upward relative to the guide rod with the help of the elastic force of the second spring, so as to reduce the buckling force between the card cover and the card slot, so that when the fixing rod continues to move upward, it can easily lean upward and open the card cover.

[0017] Preferably, the oven body is provided with a material opening, and the upward section and the downward section both extend toward the material opening and extend out of the oven. The material opening can be provided at the bottom of the oven body, or at the upper end or the middle part of the oven body according to requirements.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] (1) The fixed rod carries the material, and the two ends are firmly fixed in the special buckles to ensure that the material will not fall off or shake during the transmission process. This design makes the entire transmission process more stable and reliable. As the chain slowly rotates, the material enters the transmission system in an orderly manner from the material inlet.

[0020] In the upward section, the material is transported upward along a carefully designed S-shaped path. This design not only makes clever use of space, but also allows the material to stay in each temperature zone for a sufficient amount of time in turn to ensure that the material can be fully processed and achieve the ideal drying or fermentation effect. Each temperature zone is set with a specific temperature and time to meet the processing requirements of different materials.

[0021] When the material has completed the transmission of the upward section, it will automatically enter the downward section. In the downward section, the material is quickly transmitted downward in the vertical direction, which greatly saves the transmission time. This design not only improves the transmission efficiency, but also enables the material to enter the next processing link faster. Finally, the material is smoothly transmitted out of the material port and is ready for subsequent processing or packaging.

[0022] The entire transmission process is smooth and efficient, thanks to the precise coordination of the fixing rod, buckle, chain and other components. This design not only improves the quality of material processing, but also greatly reduces the labor intensity of operators;

[0023] (2) In the fixing device, when the card cover is opened, its back side abuts against the support plate to limit the travel; when the fixing rod is placed, the card slot and the card cover move downward relative to the fixing seat, so that the support plate pushes the card cover upward, and at the same time, under the pulling force of the second spring, the card cover rotates in the opposite direction to reset and connects with the card slot to form a buckle, automatically fixing the fixing rod;

[0024] At the same time, the fixing rod presses the pressing rod downward, and the pressing rod moves downward relative to the guide rod, thereby stretching the second spring downward through the fixing pin, so that the card cover and the card slot are buckled more tightly;

[0025] The automatic buckling and locking of the fixing device is realized;

[0026] (3) When the fixing rod is removed, the card slot and the card cover move upward relative to the support plate with the assistance of the elastic force of the first spring, so that there is enough space for the card cover to be opened; at the same time, the pressure rod moves upward relative to the guide rod with the assistance of the elastic force of the second spring to reduce the engagement force between the card cover and the card slot, so that when the fixing rod continues to move upward, it can easily lean against and open the card cover.

[0027] (4) The setting of the counterweight part in the fixing device can ensure that the material is always directly above the fixing seat during the entire transmission process, avoiding the shaking of the material during transmission. At the same time, the distance between the materials on adjacent fixing rods remains unchanged or remains in a smaller floating range, so as to ensure that the flow of hot air in the oven box is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0029] Figure 1It is a structural schematic diagram of the baking oven of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the lifting assembly of the present invention;

[0031] Figure 3 The present invention Figure 2 The enlarged structural diagram at A in the middle;

[0032] Figure 4 It is a schematic diagram of the structure of the fixing device of the present invention when the locking part is opened;

[0033] Figure 5 It is a schematic diagram of the structure of the fixing device of the present invention when the locking part is closed;

[0034] Figure 6 It is a schematic diagram of the structure of other transmission structures listed in the embodiments of the present invention.

[0035] Wherein: oven body 1, material opening 11;

[0036] Lifting assembly 2, chain 21, upward section 21a, downward section 21b, fixed block 211;

[0037] Fixing device 3, fixing seat 31, supporting plate 311, locking portion 32, buckle 32a, card slot 321, card cover 322, counterweight portion 33, guide rod 34, first spring 341, long strip hole 342, second spring 35, pressing rod 36, supporting plate 361, fixing pin 362;

[0038] Fixing rod 4. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with specific embodiments:

[0040] like Figure 1-Figure 2 As shown, the present invention is applied to the baking of fresh leaf materials. Multiple fresh leaves are neatly stacked and fixed on the fixed rod at the petiole. The two ends of the fixed rod are respectively placed on the fixing devices on the chains on both sides of the oven body, and the materials are loaded from the material port. The chains on both sides move synchronously, driving the fresh leaves to move upward along the S-shaped path, passing through different temperature control areas in turn, so as to achieve the purpose of baking the fresh leaves. Finally, the leaves are vertically transported downward through the descending section and then transported out through the material port. Specifically:

[0041] An automatic lifting oven comprises an oven body 1, a fixed rod 4 for fixing materials is arranged in the oven body 1, and a lifting assembly 2 connected to the fixed rod 4 and driving the fixed rod 4 to transport; a plurality of temperature zones are arranged in the oven body 1, and the lifting assembly 2 drives the materials to pass through each temperature zone from bottom to top in sequence through the fixed rod 4. In this embodiment, the plurality of temperature zones in the oven body 1 are arranged from bottom to top in the vertical direction, and the materials pass through different temperature zones from bottom to top in sequence under the lifting of the lifting device. When the temperature zones are arranged, pores can be arranged on the inner wall of the oven body 1, and different temperatures flow in the pores at different heights, so as to achieve the purpose of temperature differentiation. By setting different temperature zones in the vertical direction, the floor space of the baking equipment is greatly reduced, and the production cost is reduced. In this embodiment, the fixed rod 4 can be a long strip clamping device, which clamps the petiole or one end of the fresh leaf, and the other end of the fresh leaf hangs freely.

[0042] The lifting assembly 2 includes a closed-loop chain 21 symmetrically arranged at the inner walls of both sides of the oven body 1. The chain 21 includes an upward section 21a and a downward section 21b. The upward section 21a is arranged in an S-shaped bending, and the downward section 21b is arranged vertically. A plurality of fixing devices 3 are connected to the chain 21, and the two ends of the fixing rod 4 are respectively connected to the fixing devices 3 on the chains 21 on both sides. In this embodiment, the chain 21 can also use a transmission belt. The chain 21 is fixed and bent by a sprocket on the upward section 21a. A plurality of fixing blocks 211 are fixedly connected to the chain 21, and the plurality of fixing blocks 211 are evenly arranged. The fixing device 3 is rotatably connected to the fixing blocks 211. At the upward section 21a of the chain 21, when the chain 21 is in a horizontal state, a carrier plate is arranged below the chain 21, and the carrier plate is fixedly connected to the inner wall of the oven body 1; when the chain 21 moves, it is supported by the carrier plate to avoid or slow down the chain 21 being stretched downward due to gravity. By setting the upward section 21a as an S-shaped path, the material can stay in different temperature zones for a sufficient time to be fully baked in the corresponding temperature zones; by setting the downward section 21b as a vertical direction, the material can be quickly transferred downward after baking to avoid the baking effect being affected by the stay time in different temperature zones. Of course, in other embodiments, the downward section 21b can also be set outside the oven body 1.

[0043] like Figure 3-Figure 5As shown, the fixing device 3 includes a fixing seat 31, a locking portion 32 and a counterweight portion 33. The fixing seat 31 is rotatably connected to the fixing block 211 on the chain 21; the locking portion 32 is arranged above the fixing seat 31, and the counterweight portion 33 is arranged below the fixing seat 31; the fixing rod 4 is connected to the locking portion 32. In this embodiment, on both sides of the rotatable connection between the fixing seat 31 and the fixing block 211, the torque at the end where the counterweight portion 33 is located is greater than the torque at the locking portion 32, so that the counterweight portion 33 is directly below the locking portion 32; at the same time, when the fixing rod 4 is placed on the locking portion 32, the distance between the locking portion 32 and the fixing seat 31 is reduced, and the distance between the counterweight portion 33 and the fixing seat 31 is increased, so that the torque at the end where the counterweight portion 33 is located is still greater than the torque at the locking portion 32, and the counterweight portion 33 is still below the locking portion 32. During the transmission process, the fixing device 3 may rotate slightly along the rotating connection between it and the fixed block 211, causing the fixing rod 4 and the material to shake, but the amplitude is small and can be quickly adjusted through the counterweight part 33, ensuring that the spacing of the materials always remains consistent or floats within a smaller range, avoiding affecting the circulation of gas in the oven box 1.

[0044] In other designs, such as Figure 6 As shown, in the scheme without the counterweight part 33, if the locking part 32 is directly fixedly connected or rotatably connected to the fixed block 211, when the fixed rod 4 and the material are being transported in the upward section 21a, the distance between the upper and lower layers of material in area a is greater than that in area b, causing the material distance to change, resulting in uneven air flow in the oven body 1. If the locking part 32 is directly or fixedly connected through the fixed block 211, when the fixed rod 4 and the material move in the upward section 21a, the fixed rod 4 will slide along the inner circumference of the locking part 32, so that the area where the locking part 32 supports the fixed rod 4 is always changing. Therefore, at least a device with a large locking force must be provided to lock the fixed rod 4, and the relatively complicated opening and locking operations of such a locking device reduce the efficiency of taking and placing the fixed rod 4.

[0045] A guide rod 34 is connected below the locking portion 32, and the lower end of the guide rod 34 passes through the fixed seat 31 and is connected to the counterweight portion 33; a first spring 341 is sleeved on the guide rod 34, and the first spring 341 is arranged between the fixed seat 31 and the locking portion 32. The locking portion 32 includes a U-shaped card slot 321 and a card cover 322 that is rotatably connected to the card slot 321, and the card cover 322 and the card slot 321 together form an annular buckle 32a, and the fixing rod 4 is arranged in the buckle 32a. A second spring 35 is connected to the card cover 322 near the rotation connection between the card cover 322 and the card slot 321, and one end of the second spring 35 away from the card cover 322 is connected to the guide rod 34. A support plate 311 is connected to the fixed seat 31, and when the card cover 322 and the card slot 321 rotate with each other to open the buckle 32a, the card cover 322 contacts the support plate 311. In this embodiment, the guide rod 34 is vertically arranged and fixedly connected below the card slot 321. The upper end of the slot 321 and the lower end of the cover 322 can both be arranged in a plate arc shape, and the two are combined to form a circular ring-shaped buckle 32a. The connection between the second spring 35 and the cover 322 cannot be too close to the rotation connection between the cover 322 and the slot 321, otherwise the cover 322 cannot be pulled to connect with the slot 321; nor can it be too far away from the connection between the slot 321 and the cover 322, otherwise it will affect the placement of the fixing rod 4. When the cover 322 is opened, Figure 4 As shown, the upper end of the support plate 311 just contacts the end surface of the card cover 322, so as to prevent the card cover 322 from being unable to close due to excessive opening. When the fixing rod 4 is placed, the fixing rod 4 presses the card slot 321 downward, the card slot 321 moves downward relative to the fixing seat 31, the guide rod 34 moves downward relative to the fixing seat 31, the first spring 341 is compressed, and the support plate 311 moves upward relative to the card cover 322, so that the support plate 311 pushes the card cover 322 upward, and the card cover 322 rotates in the direction of closing with the card slot 321. At the same time, under the pulling force of the second spring 35, the card cover 322 quickly closes with the card slot 321 to form a buckle 32a, and the fixing rod 4 is fixed in the buckle 32a. When the fixing rod 4 is taken out, the fixing rod 4 moves upward and pushes the card cover 322, so that the card cover 322 rotates in the direction of opening the card slot 321. At the same time, due to the reduction of the downward pressure of the fixing rod 4, the first spring 341 is reset and supports the locking portion 32 upward, so that the card cover 322 and the support plate 311 move away from each other to avoid interference with the support rod when the card cover 322 is opened; when the card cover 322 is opened to a certain position, the support plate 311 supports the card cover 322 to avoid the card cover 322 from becoming too large.

[0046] In this embodiment, the card slot 321 and the card cover 322 can be set to a semicircular shape according to the cross-sectional shape of the fixing rod 4, or can be set to other shapes, but it is necessary to ensure that when the fixing rod 4 is placed in the buckle, there is enough space between the top of the fixing rod 4 and the card cover 322, so that when the fixing rod 4 is taken out, the support plate 361 has enough distance to move upward.

[0047] In order to further increase the locking ability of the locking part 32, a pressure rod 36 is arranged through the guide rod 34, and a support plate 361 is arranged at the upper end of the pressure rod 36, and the support plate 361 is arranged in the card slot 321; a vertical long strip hole 342 is arranged on the upper part of the guide rod 34, and a fixing pin 362 is connected to the lower end of the pressure rod 36, and the fixing pin 362 is arranged in the long strip hole 342; the second spring 35 is connected to the fixing pin 362. In this embodiment, when the fixing rod 4 is placed, the fixing rod 4 is placed on the support plate 361, and the pressure rod 36 is pressed downward, so that the pressure rod 36 moves downward relative to the guide rod 34, and then the fixing pin 362 moves downward, the second spring 35 is stretched, the tension is increased, and then the locking ability of the card cover 322 is increased; when the fixing rod 4 is taken out, the pressure rod 36 moves upward under the drive of the second spring 35, so that the second spring 35 contracts, the tension is reduced, and then the card cover 322 is easy to open.

[0048] The working principle of the lifting device in the present invention is:

[0049] When loading, the card cover 322 rotates and opens relative to the card slot 321. When the card cover 322 rotates to a certain stroke, it is blocked by the support plate 311 to avoid excessive stroke. When the fixing rod 4 is placed, it presses the support plate 361 downward, so that the support plate 361 moves downward relative to the guide rod 34, the fixing pin 362 moves downward along the long strip hole 342, and the second spring 35 is stretched. At the same time, the card slot 321 also moves downward relative to the fixing seat 31, the first spring 341 is compressed, and the support plate 311 moves upward relative to the card cover 322 and pushes the card cover 322, so that the card cover 322 rotates in the opposite direction, and then engages with the card slot 321 under the pulling force of the second spring 35 to lock the fixing rod 4.

[0050] When unloading, the fixing rod 4 is driven upward by manual or mechanical equipment, the pressure rod 36 moves upward under the pulling force of the second spring 35, the fixing pin 362 moves upward in the long strip hole 342, the second spring 35 contracts, and the pulling force is reduced; when the fixing rod 4 continues to move upward, its upper end pushes the card cover 322 upward, so that the card cover 322 rotates in the opposite direction along the connection between it and the card slot 321 until it is fully opened and the fixing rod 4 is taken out; at the same time, the first spring 341 stretches and resets and drives the card slot 321 and the card cover 322 to move upward, so that when the card cover 322 is opened, it can avoid being interfered by the support rod and cannot remain in the open state.

[0051] In addition, it should be noted that when the fixing rod 4 is placed, the process of the first spring 341 being compressed and the second spring 35 being stretched can be carried out simultaneously or successively, and the order of the sequential actions can achieve the above-mentioned technical effect, and different spring specifications can be selected to achieve it; similarly, when the fixing rod 4 is taken out, the process of the first spring 341 extending and resetting and the second spring 35 contracting can be carried out simultaneously or successively.

[0052] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the scope of protection of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. An automatic lifting baking oven, characterized in that: The invention comprises an oven body (1), wherein a fixing rod (4) for fixing materials is arranged inside the oven body (1), and a lifting assembly (2) connected to the fixing rod (4) and driving the fixing rod (4) to transport; a plurality of temperature zones are arranged inside the oven body (1), and the lifting assembly (2) drives the materials to pass through each temperature zone from bottom to top in sequence through the fixing rod (4); The lifting assembly (2) comprises a closed-loop chain (21) symmetrically arranged on the inner walls of both sides of the oven body (1), the chain (21) comprising an upward section (21) and a downward section (21), the upward section (21) being arranged in an S-shaped bending, and the downward section (21) being arranged vertically; a plurality of fixing devices (3) are connected to the chain (21), and the two ends of the fixing rod (4) are respectively connected to the fixing devices (3) on the chains (21) on both sides; The fixing device (3) is provided with a locking portion (32), the lower end of the locking portion (32) is rotatably connected to the chain (21), and when the fixing device (3) is transmitted along with the chain (21), the locking portion (32) is always located directly above the connection between the locking portion (32) and the chain (21).

2. The automatic lifting oven according to claim 1, characterized in that: The fixing device (3) further comprises a counterweight portion (33), wherein the torque at the end of the counterweight portion (33) is greater than the torque at the locking portion (32), so that the counterweight portion (33) is located below the locking portion (32).

3. The automatic lifting oven according to claim 2, characterized in that: The fixing device (3) comprises a fixing seat (31) rotatably connected to the chain (21), the locking portion (32) is arranged above the fixing seat (31), and the counterweight portion (33) is arranged below the fixing seat (31); the fixing rod (4) is connected to the locking portion (32).

4. The automatic lifting oven according to claim 3, characterized in that: A guide rod (34) is connected below the locking portion (32), and the lower end of the guide rod (34) passes through the fixing seat (31) and is connected to the counterweight portion (33); The guide rod (34) is sleeved with a first spring (341), and the first spring (341) is arranged between the fixing seat (31) and the locking portion (32).

5. The automatic lifting baking oven according to claim 4, characterized in that: The locking portion (32) comprises a U-shaped card slot (321) and a card cover (322) rotatably connected to the card slot (321), the card cover (322) and the card slot (321) together form an annular card buckle (32), and the fixing rod (4) is arranged in the card buckle (32); The card cover (322) is connected to a second spring (35) near the rotation connection between the card cover (322) and the card slot (321), and one end of the second spring (35) away from the card cover (322) is connected to the guide rod (34).

6. The automatic lifting oven according to claim 5, characterized in that: The fixing seat (31) is connected to a support plate (311), and when the card cover (322) and the card slot (321) rotate relative to each other to open the buckle (32), the card cover (322) contacts the support plate (311).

7. The automatic lifting baking oven according to claim 6, characterized in that: A pressure rod (36) is provided through the guide rod (34), a support plate (361) is provided at the upper end of the pressure rod (36), and the support plate (361) is arranged in the card slot (321); The guide rod (34) is provided with a vertical long strip hole (342), the lower end of the pressure rod (36) is connected with a fixing pin (362), and the fixing pin (362) is arranged in the long strip hole (342); the second spring (35) is connected to the fixing pin (362).

8. The automatic lifting oven according to claim 1, characterized in that: The oven body (1) is provided with a material opening (11), and the ascending section (21) and the descending section (21) both extend towards the material opening (11) and extend out of the oven.

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