A weighing device for detecting the weight of tobacco leaves in a curing barn and a tobacco leaf curing system

Abstract

The application provides a weighing device for detecting the weight of tobacco leaves in a curing barn and a tobacco leaf curing system. The weighing device comprises a tobacco leaf curing rack, a moving component and a weighing component. The tobacco leaf curing rack comprises a placing rack body and a clamping assembly. The clamping assembly comprises a plurality of clamping units for clamping tobacco leaves. The moving component comprises a moving rack body and a moving assembly arranged on the moving rack body. The moving assembly comprises a plurality of moving units arranged at intervals. The placing rack body is movably arranged on the moving units. The weighing component comprises a weighing assembly and a lifting assembly. The tobacco leaves are clamped on the clamping units and connected to the placing rack body. When the tobacco leaf curing rack moves on the moving units of the moving assembly, the tobacco leaves in the tobacco leaf curing rack can be cured. The lifting assembly is used to lift the weighing rack to top the placing rack body. The weighing unit can detect the weight change of the tobacco leaves in the curing process in real time. The moisture content in the tobacco leaves is determined according to the weight change of the tobacco leaves, so as to determine the curing degree of the tobacco leaves.

Description

Technical Field

[0001] This invention relates to the technical field of tobacco processing, and more specifically, to a weighing device for detecting the weight of tobacco leaves in a curing barn and a tobacco curing system. Background Technology

[0002] The tobacco curing process is a complex and dynamic system, encompassing both physical changes such as moisture evaporation and drying, and a series of physiological and biochemical transformations. These two processes interact and influence each other, forming a unified whole. The dynamic changes in moisture content within the tobacco leaves during curing are highly correlated with the quality of the cured leaves. These changes directly regulate enzyme activity, which in turn profoundly affects the conversion efficiency of chemical components, thus significantly impacting the final quality of the tobacco leaves. However, determining the moisture content of tobacco leaves in curing barns remains challenging, relying primarily on manual experience or traditional observation methods, making precise monitoring difficult. This uncertainty not only affects the stability of tobacco quality but may also lead to energy waste and increased labor costs, negatively impacting the overall efficiency of the tobacco industry. Therefore, developing a technology capable of real-time and accurate monitoring of tobacco leaf moisture content is of great significance for improving tobacco quality and promoting the modernization of the tobacco industry.

[0003] Traditional manual observation methods rely on the operator's experience to estimate moisture content by judging the appearance characteristics of tobacco leaves. Although this method is simple and easy to implement, it is highly dependent on the operator's experience, has problems of strong subjectivity and low accuracy, is prone to judgment errors, and is difficult to meet the needs of modern large-scale production.

[0004] Chinese utility model patent CN219475279U discloses an electronic scale for weighing tobacco leaves in a curing barn, including a crossbar with a first hook connected to it. A threaded rod is threadedly connected to the first hook, and one end of the threaded rod is bearing-connected to a clamping plate inside the first hook. A tension sensor is set at the output end of a hydraulic rod fixed to the lower end of the first hook. The tension sensor monitors the weight change of the tobacco leaves in real time, and the moisture content of the tobacco leaves is determined by the weight change, thereby determining the degree of curing of the tobacco leaves.

[0005] However, placing the weighing scale on top of the curing chamber can lead to excessively high temperatures and humidity, which can affect the accuracy of the scale and the lifespan of its accessories, such as steel wire ropes and anti-slip wheels. In addition, the tobacco needs to be placed into the curing chamber slowly, which is not conducive to improving the tobacco curing efficiency. Summary of the Invention

[0006] In view of this, and in order to solve the above problems, the present invention provides a weighing device for detecting the weight of tobacco leaves in a curing barn and a tobacco curing system, the specific technical solution of which is as follows: On one hand, a weighing device for detecting the weight of tobacco leaves in a curing barn includes: A tobacco curing rack includes a placement frame and a clamping assembly disposed on the placement frame, the clamping assembly including a plurality of clamping units for clamping tobacco leaves; The movable component includes a movable frame and a movable assembly disposed on the movable frame. The movable assembly includes a plurality of movable units disposed at intervals, and the placement frame is movably disposed on the movable units. A weighing component includes a weighing assembly and a lifting assembly. The weighing assembly includes a weighing frame and a weighing unit disposed on the weighing frame. The weighing frame includes a frame body and a top plate disposed on the frame body. The weighing unit is disposed at the bottom of the top plate. The lifting assembly lifts the weighing frame so that the top surface of the top plate abuts against the weighing frame.

[0007] The aforementioned weighing device clamps tobacco leaves onto a clamping unit and connects it to a placement frame. When the tobacco curing rack moves on the moving unit of the moving assembly, it can cure the tobacco leaves on the curing rack. The weighing unit uses a lifting assembly to raise the weighing frame, so that the top surface of the top plate rests on the placement frame. The weighing unit weighs the entire weight of the placement frame in real time. Knowing the weight of the placement frame, it can detect the weight change of the tobacco leaves during the curing process in real time, and determine the moisture content of the tobacco leaves by observing the weight change, thereby determining the degree of curing. Simultaneously, only the weighing frame is needed to support the placement frame during weighing, resulting in a simple and reliable structure. It is well-suited for high-temperature and high-humidity curing environments, extending the overall service life. However, this design is less effective in affecting the accuracy of the weighing scale and the lifespan of auxiliary devices such as wire ropes and anti-slip wheels. Simply clamping the tobacco onto the clamping unit and then hanging the entire clamping assembly onto the placement frame improves tobacco curing efficiency.

[0008] Furthermore, the moving unit is a roller unit, and a top gap is provided between each pair of roller units. The top plate includes a number of top blocks disposed within the top gap.

[0009] Furthermore, the top of the top block is provided with a top slot that is adapted to the bottom of the placement frame.

[0010] Furthermore, the lifting assembly includes a lifting cylinder and a guide unit. The lifting cylinder includes a cylinder body fixedly installed on the movable frame and a cylinder rod that extends and retracts relative to the cylinder body. The frame body is connected to the top end of the cylinder rod. The guide unit consists of guide rods symmetrically arranged around the lifting cylinder and guide cylinders fitted onto the guide rods.

[0011] On the other hand, a tobacco curing system includes a curing device and a weighing device; the curing device includes a curing component with a curing channel, and the moving component of the weighing device is a conveyor roller disposed within the curing channel; the weighing component is disposed at the bottom of the conveyor roller.

[0012] Furthermore, the moving component includes a rectangular conveying channel and a rotating conveying assembly. The rectangular conveying channel includes four conveying rollers arranged in a rectangular pattern. The rotating conveying assembly includes a rotating conveying mechanism located at opposite corners of two pairs of conveying rollers. The baking component includes a baking chamber disposed on the conveying rollers.

[0013] Furthermore, the clamping assembly includes a hanging unit, a scissor fork structure disposed below the hanging unit, and two clamping horizontal shafts disposed on the scissor fork structure. The clamping unit includes clamping blocks disposed on the two clamping horizontal shafts respectively. The scissor fork structure includes a hinge seat hinged to the hanging unit, a first scissor fork block and a second scissor fork block respectively hinged to the hinge seat, and a driving unit for driving the second scissor fork block away from or close to the first scissor fork block. The two clamping horizontal shafts are respectively hub-connected to the first scissor fork block and the second scissor fork block.

[0014] Furthermore, it also includes a control device; the baking component further includes a heating assembly disposed within the baking channel; the control device includes a temperature sensor disposed within the baking channel and a control host electrically connected to the temperature sensor, the control host being electrically connected to the weighing unit; the weighing unit weighs the tobacco baking rack and sends a weight signal to the control host, the temperature sensor sends a temperature signal to the control host, and the control host, based on the weight signal and temperature signal, issues a control signal to adjust the heating output power of the heating assembly.

[0015] Furthermore, the weighing unit includes a strain sensor and a load cell. The strain sensor senses the pressure change caused by the weight of the tobacco drying rack and converts it into an electrical signal. The load cell converts the electrical signal into a weight signal.

[0016] Furthermore, it also includes a tobacco leaf conveying device; the rectangular conveying channel is provided with a conveying and unloading position, and the moving component further includes a loading and unloading positioning unit disposed at the conveying and unloading position; the tobacco leaf conveying device includes a first conveying component for transporting uncured tobacco leaves to the conveying and unloading position, and a second conveying component for transporting cured tobacco leaves away from the conveying and unloading position. Attached Figure Description

[0017] The invention will be further understood from the following description taken in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale, but rather the emphasis is on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0018] Figure 1 This is a schematic diagram of the weighing device according to an embodiment of the present invention; Figure 2 This is a structural cross-sectional view of the weighing device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a tobacco curing system according to an embodiment of the present invention; Figure 4 This is a partial structural cross-sectional view of the tobacco curing system according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the clamping assembly according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the rotary conveying mechanism according to an embodiment of the present invention; Figure 7 This is a control schematic diagram of the control device according to an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Tobacco leaf curing rack; 2. Clamping assembly; 3. Moving parts; 4. Weighing parts; 5. Curing device; 6. Weighing device; 7. Control device; 11. Place the frame; 21. Hanging unit; 22. Scissor fork structure; 23. Clamping horizontal axis; 24. Clamping unit; 221. Hinge base; 222. First scissor fork block; 223. Second scissor fork block; 224. Drive unit; 31. Mobile frame; 32. Mobile component; 33. Mobile unit; 35. Rotary conveyor mechanism; 301. Rectangular conveyor channel; 302. Rotary conveyor assembly; 351. Conveying assembly; 352. Rotating assembly; 41. Weighing assembly; 42. Lifting assembly; 43. Weighing frame; 44. Weighing unit; 421. Lifting cylinder; 422. Guide unit; 431. Frame main body; 432. Top plate; 51. Baking components; 511. Baking oven body; 512. Heating components; 71. Temperature sensor; 72. Control host. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] In this invention, the terms "first" and "second" do not represent a specific quantity or order, but are merely used to distinguish names.

[0024] On the one hand, such as Figure 1 and Figure 2 As shown, a weighing device for detecting the weight of tobacco leaves in a curing barn according to an embodiment of the present invention includes: The tobacco curing rack 1 includes a placement frame 11 and a clamping assembly 2 disposed on the placement frame 11. The clamping assembly 2 includes a plurality of clamping units 24 for clamping tobacco leaves. The movable component 3 includes a movable frame 31 and a movable assembly 32 disposed on the movable frame 31. The movable assembly 32 includes a plurality of movable units 33 disposed at intervals. The placement frame 11 is movably disposed on the movable units 33. The weighing component 4 includes a weighing assembly 41 and a lifting assembly 42. The weighing assembly 41 includes a weighing frame 43 and a weighing unit 44 disposed on the weighing frame 43. The weighing frame 43 includes a frame body 431 and a top plate 432 disposed on the frame body 431. The weighing unit 44 is disposed at the bottom of the top plate 432. The lifting assembly 42 lifts the weighing frame 43 so that the top surface of the top plate 432 abuts against the placement frame 11.

[0025] The aforementioned weighing device, by clamping the tobacco leaves onto the clamping unit 24 and connecting it to the placement frame 11, can bake the tobacco leaves on the tobacco baking rack 1 when the tobacco baking rack 1 moves on the moving unit 33 of the moving component 32. The weighing frame 43 is lifted by the lifting component 42 so that the top surface of the top plate 432 abuts against the placement frame 11. The top surface of the top plate 432 of the weighing unit 44 abuts against the placement frame 11. The weighing unit 44 weighs the overall weight of the placement frame 11 in real time. With the weight of the placement frame 11 known, it can detect the weight change of the tobacco leaves in real time during the baking process. The moisture content of the tobacco leaves is determined by the weight change of the tobacco leaves, thereby determining the degree of baking of the tobacco leaves. Meanwhile, during weighing, only the weighing frame 43 is needed to support the placement frame 11. The structure is simple and reliable, and it is well-suited for high-temperature and high-humidity baking environments, which helps to extend the overall service life. This will affect the accuracy of the weighing electronic scale and the service life of the attached devices such as wire ropes and anti-slip wheels. Simply clamp the tobacco onto the clamping unit 24, and then hang the entire clamping assembly 2 onto the placement frame 11 together, which helps to improve the tobacco baking efficiency.

[0026] In one embodiment, a heat insulation cover is provided below the moving unit 33, and the heat insulation cover has ventilation holes adapted to the top plate 432. In this way, the heat insulation cover can isolate some heat and moisture, thereby improving the service life of the lifting assembly 42.

[0027] like Figure 1 and Figure 2 As shown, in one embodiment, the moving unit 33 is a roller unit, with a top gap between each pair of roller units. The top plate 432 includes a plurality of top blocks disposed within the top gaps. Specifically, the moving assembly 32 also includes a drive motor and a transmission belt unit. The roller unit includes a roller body and a driven pulley disposed at one end of the roller body. The drive motor drives the driven pulley to rotate through the transmission belt unit, thereby driving the roller body to rotate.

[0028] In one embodiment, the top of the top block is provided with a top locking groove that fits the bottom of the placement frame 11. In this way, by pressing the top block against the bottom of the placement frame 11 through the top locking groove, the position of the placement frame 11 can be defined, while improving the stability of the lifting action of the placement frame 11.

[0029] In one embodiment, the lifting assembly 42 includes a lifting cylinder 421 and a guide unit 422. The lifting cylinder 421 includes a cylinder body fixedly mounted on the movable frame 31 and a cylinder rod that extends and retracts relative to the cylinder body. The frame body 431 is connected to the top end of the cylinder rod. The guide unit 422 consists of guide rods symmetrically arranged around the lifting cylinder 421 and guide cylinders fitted onto the guide rods. Specifically, there are at least two guide rods, which are fixedly mounted on the frame body 431, and the guide cylinders are fixedly connected to the movable frame 31. Thus, by extending and retracting the cylinder rods relative to the cylinder body, the cylinder rods lift the frame body 431, thereby raising the placement frame 11. Simultaneously, the guide rods reciprocate up and down within the guide cylinder, achieving a stable lifting effect.

[0030] On the one hand, such as Figure 3 and Figure 4 As shown, a tobacco curing system according to an embodiment of the present invention includes a curing device 5 and a weighing device 6; the curing device 5 includes a curing component 51 with a curing channel, and the moving component 32 of the weighing device 6 is a conveying roller conveyor disposed in the curing channel; the weighing component 4 is disposed at the bottom of the conveying roller conveyor.

[0031] The aforementioned tobacco curing system, by setting the conveyor rollers inside the curing channel and using the weighing component 4 to detect the weight changes of the tobacco leaves in real time during the curing process, adjusts the curing temperature and curing time, thereby improving the efficiency of tobacco curing.

[0032] In one embodiment, the moving component 3 includes a rectangular conveying channel 301 and a rotating conveying assembly 302. The rectangular conveying channel 301 includes four rectangularly arranged conveying rollers, and the rotating conveying assembly 302 includes rotating conveying mechanisms 35 located at opposite corners of each pair of conveying rollers. The baking component 51 includes a baking chamber 511 mounted on the conveying rollers. Specifically, the baking chamber 511 is adapted to the moving frame 31, and heat insulation covers (not shown in the figure) are also provided at opposite corners of each pair of conveying rollers. The entire moving component 3 forms a baking channel with a stable temperature. Because traditional baking barns bake the entire room, the temperature and humidity in different areas of the room will vary, resulting in different baking effects for tobacco leaves in different locations and thus lower baking quality. Therefore, by combining multiple conveying rollers, different baking chambers can be obtained, and the heating temperature can be adjusted according to the actual moisture content of the tobacco leaves, effectively improving the baking quality.

[0033] like Figure 3 and Figure 6As shown, in one embodiment, the rotary conveying mechanism 35 includes a conveying component 351 and a rotating component 352. The conveying component 351 includes a conveying roller table with a plurality of conveying rollers. The rotating component 352 drives the conveying roller table to rotate at least 90 degrees, thereby enabling the tobacco curing rack 1 to be transferred to another conveying roller table at a right-angle turn.

[0034] In one embodiment, the conveying assembly 351 includes a conveying bracket, a plurality of roller units rotatably connected to the conveying bracket, and a conveying transmission unit for driving the roller units to rotate. The rotating assembly 352 includes a fixed bracket, a rotating disk rotatably connected to the fixed bracket, and a rotating drive unit for driving the rotating disk to rotate. The top of the rotating disk is fixedly connected to the conveying bracket. The rotating drive unit includes a rotating drive motor fixedly connected to the fixed bracket, a first pulley disposed at the output end of the rotating drive motor, a second pulley with its hub connected to the bottom of the rotating disk, and a synchronous belt surrounding the first and second pulleys. Thus, the rotating drive motor sequentially drives the first pulley, the synchronous belt, the second pulley, and the rotating disk to achieve rotation. The belt drive structure of the rotating drive unit is stable and reliable, and can accurately rotate to a preset angle.

[0035] In one embodiment, the rectangular conveying channel 301 can be replaced with an S-shaped conveying channel to save space in the drying room.

[0036] In one embodiment, the baking chamber 511 is equipped with electrically operated heat-insulating doors at both ends. Thus, by opening the electrically operated heat-insulating doors, the tobacco baking rack 1 enters the baking chamber of the baking chamber 511, and then the electrically operated heat-insulating doors close, creating a relatively stable baking space within the baking chamber, maintaining a suitable heating temperature, and improving the quality of the baked tobacco.

[0037] like Figure 4 and Figure 5As shown, in one embodiment, the clamping assembly 2 includes a hanging unit 21, a scissor fork structure 22 disposed below the hanging unit 21, and two clamping horizontal shafts 23 disposed on the scissor fork structure 22. The clamping unit 24 includes clamping blocks respectively disposed on the two clamping horizontal shafts 23. The scissor fork structure 22 includes a hinge seat 221 hinged to the hanging unit 21, a first scissor fork block 222 and a second scissor fork block 223 respectively hinged to the hinge seat 221, and a driving unit 224 for driving the second scissor fork block 223 away from or close to the first scissor fork block 222. The two clamping horizontal shafts 23 are respectively hub-connected to the first scissor fork block 222 and the second scissor fork block 223. Thus, the clamping assembly 2 is removed and laid flat. By placing the ends of multiple tobacco leaves horizontally between the two clamping blocks, the driving unit 224 drives the second scissor fork block 223 away from or closer to the first scissor fork block 222. The two clamping blocks clamp the ends of the tobacco leaves, thereby achieving the function of quick clamping.

[0038] In one embodiment, the drive unit 224 includes a first limiting spring, a second limiting spring, and an operating handle hinged to the hanging unit 21. The first limiting spring connects the hanging unit 21 and the first scissor fork block 222 via a connecting rod. The first scissor fork block 222 is held close to the second scissor fork block 223 by an elastic contraction force. The second limiting spring connects the second scissor fork block 223 and the movable end of the operating handle. Thus, through the elastic action of the first and second limiting springs, the first scissor fork block 222 and the second scissor fork block 223 automatically move closer together when no external force is applied. When it is necessary to insert the tobacco leaf to be clamped, the second scissor fork block 223 can be moved away from the first scissor fork block 222 by swinging the operating handle, thereby creating a clamping space to accommodate the end of the tobacco leaf.

[0039] like Figure 3 and Figure 4 , Figure 7As shown, in one embodiment, a control device 7 is also included; the baking component 51 further includes a heating assembly 512 disposed within the baking channel; the control device 7 includes a temperature sensor 71 disposed within the baking channel and a control host 72 electrically connected to the temperature sensor 71, the control host 72 being electrically connected to the weighing unit 44. Thus, the weighing unit 44 weighs the tobacco baking rack 1 and sends a weight signal to the control host 72, while the temperature sensor 71 sends a temperature signal to the control host 72. The control host 72 calculates the weight of the tobacco leaves based on the weight and temperature signals, by subtracting the weight of the placement rack 11 and the clamping assembly 2. Based on big data model analysis, it determines the moisture content of the tobacco leaves and issues a control signal to adjust the heating output power of the heating assembly 512, thereby controlling the heating temperature within the baking channel. This allows for real-time adjustment of the actual heating temperature based on the differences in tobacco moisture content on each placement rack 11, further improving the quality of tobacco baking.

[0040] In one embodiment, the weighing unit 44 includes a strain sensor and a load cell. The strain sensor senses the pressure change caused by the weight of the tobacco drying rack 1 and converts it into an electrical signal. The load cell then converts the electrical signal into a weight signal. Thus, by sensing the pressure change caused by the weight of the tobacco drying rack 1 through the strain sensor and converting it into an electrical signal, and then transmitting the converted electrical signal to the control host 72 through the load cell, stable transmission of the weight signal is ensured.

[0041] In one embodiment, a tobacco leaf conveying device is also included; the rectangular conveying channel 301 is provided with a conveying and unloading position, and the moving component 3 further includes a loading and unloading positioning unit disposed at the conveying and unloading position; the tobacco leaf conveying device includes a first conveying component for transporting uncooked tobacco leaves to the conveying and unloading position, and a second conveying component for transporting uncooked tobacco leaves away from the conveying and unloading position. Thus, the first conveying component transports uncooked tobacco leaves to the conveying and unloading position, where the operator can clamp the tobacco leaves onto the clamping assembly 2 for rapid loading; the operator unloads the uncooked tobacco leaves from the clamping assembly 2, and the second conveying component transports the uncooked tobacco leaves away from the conveying and unloading position, thereby improving the efficiency of the curing production process.

[0042] In one embodiment, the first conveying component further includes a tobacco trimming mechanism, which comprises a first conveying unit, a leaf sorting unit, and a second conveying unit. The leaf sorting unit is fixedly disposed below one end of the first conveying unit; the second conveying unit is fixedly disposed below one end of the leaf sorting unit; the leaf sorting unit includes a planar conveying device and a blocking device; the conveying surface of the planar conveying device is inclined relative to the horizontal plane; that is, the conveying surface of the planar conveying device is inclined along one side of the material conveying direction, with one side higher than the other. Thus, when the tobacco leaves fall from one end of the first conveying unit onto the conveying surface of the planar conveying device, the tip of the tobacco leaves will slide down along the inclined direction of the conveying surface and collide with the blocking device, thereby achieving neat placement of the tip of the tobacco leaves.

[0043] Specifically, after the head ends of multiple tobacco leaves are placed, the operator can simultaneously place multiple tobacco leaves between the two clamping blocks of the clamping component 2 to clamp multiple tobacco leaves at the same time, thereby improving the tobacco leaf clamping efficiency and thus improving the baking production efficiency.

[0044] In one embodiment, the conveying surface of the planar conveying device forms an angle with the conveying surface of the first conveying unit, and the height of the conveying surface of the first conveying unit is higher than the height of the conveying surface of the planar conveying device; the blocking device is fixedly provided on the lower side of the conveying surface of the planar conveying device, and the upper edge of the blocking device protrudes from the conveying surface of the planar conveying device.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A weighing device for detecting the weight of tobacco leaves in a curing barn, characterized in that, include: A tobacco curing rack includes a placement frame and a clamping assembly disposed on the placement frame, the clamping assembly including a plurality of clamping units for clamping tobacco leaves; The movable component includes a movable frame and a movable assembly disposed on the movable frame. The movable assembly includes a plurality of movable units disposed at intervals, and the placement frame is movably disposed on the movable units. A weighing component includes a weighing assembly and a lifting assembly. The weighing assembly includes a weighing frame and a weighing unit disposed on the weighing frame. The weighing frame includes a frame body and a top plate disposed on the frame body. The weighing unit is disposed at the bottom of the top plate. The lifting assembly lifts the weighing frame so that the top surface of the top plate abuts against the weighing frame.

2. The weighing device according to claim 1, characterized in that, The moving unit is a roller unit, and there is a top gap between each pair of roller units. The top plate includes a number of top blocks arranged in the top gap.

3. A weighing device according to claim 2, characterized in that, The top of the top block is provided with a top slot that is adapted to the bottom of the placement frame.

4. A weighing device according to claim 1, characterized in that, The lifting assembly includes a lifting cylinder and a guide unit. The lifting cylinder includes a cylinder body fixedly installed on the movable frame and a cylinder rod that extends and retracts relative to the cylinder body. The frame body is connected to the top end of the cylinder rod. The guiding unit consists of guide rods symmetrically arranged around the lifting cylinder and guide cylinders fitted onto the guide rods.

5. A tobacco curing system, characterized in that, Includes a baking apparatus and a weighing device as described in any one of claims 1 to 4; The baking device includes a baking component with a baking channel, and the moving component of the weighing device is a conveyor roller conveyor disposed within the baking channel; the weighing component is disposed at the bottom of the conveyor roller conveyor.

6. A tobacco curing system according to claim 5, characterized in that, The moving component includes a rectangular conveying channel and a rotary conveying assembly. The rectangular conveying channel includes four conveying rollers arranged in a rectangular shape. The rotary conveying assembly includes a rotary conveying mechanism arranged at opposite corners of two pairs of conveying rollers. The baking component includes a baking chamber disposed on the conveyor roller conveyor.

7. A tobacco curing system according to claim 5, characterized in that, The clamping assembly includes a hanging unit, a scissor fork structure disposed below the hanging unit, and two clamping horizontal shafts disposed on the scissor fork structure. The clamping unit includes clamping blocks disposed on the two clamping horizontal shafts respectively. The scissor fork structure includes a hinge seat hinged to the hanging unit, a first scissor fork block and a second scissor fork block respectively hinged to the hinge seat, and a drive unit for driving the second scissor fork block away from or close to the first scissor fork block. Two clamping horizontal shafts are respectively hub-connected to the first scissor fork block and the second scissor fork block.

8. A tobacco curing system according to claim 6, characterized in that, It also includes control devices; The baking component also includes a heating element disposed within the baking channel; The control device includes a temperature sensor installed in the baking channel and a control host electrically connected to the temperature sensor. The control host is electrically connected to the weighing unit. The weighing unit weighs the tobacco curing rack and sends a weight signal to the control host. The temperature sensor sends a temperature signal to the control host. The control host issues a control signal based on the weight and temperature signals to adjust the heating output power of the heating components.

9. A weighing device according to claim 8, characterized in that, The weighing unit includes a strain sensor and a weighing sensor. The strain sensor senses the pressure change caused by the weight of the tobacco drying rack and converts it into an electrical signal. The weighing sensor converts the electrical signal into a weight signal.

10. A tobacco curing system according to claim 5, characterized in that, It also includes tobacco leaf conveying devices; The rectangular conveying channel is provided with a conveying and unloading position, and the moving part further includes a loading and unloading positioning unit disposed at the conveying and unloading position; The tobacco leaf conveying device includes a first conveying component for transporting uncured tobacco leaves to the conveying and unloading position, and a second conveying component for transporting cured tobacco leaves away from the conveying and unloading position.

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