A tunnel-type papermaking sheet drying oven

Abstract

This invention provides a tunnel-type drying oven for papermaking sheets, including a tunnel-type chamber for receiving and drying papermaking sheets. During drying, the papermaking sheets move along the length of the tunnel-type chamber. The oven also includes a temperature scanning device located inside the tunnel-type chamber. The temperature scanning device includes a conveying component, an inner rotating component, a clamping component, and a temperature acquisition mechanism. The conveying component moves the clamping component along the length of the tunnel-type chamber, and the inner rotating component moves the clamping component around a rotation axis. The clamping component clamps and fixes the temperature acquisition mechanism, which collects the temperature in its vicinity. This invention upgrades single-point static measurement to a three-dimensional dynamic scanning design, effectively solving the problem of monitoring the thermal field during the drying process of papermaking sheets and providing accurate data support for optimizing production processes.

Description

Technical Field

[0001] This utility model belongs to the field of tobacco production technology, specifically relating to a tunnel-type papermaking sheet drying oven. Background Technology

[0002] As a crucial heating device, the precise control of the internal temperature of an oven is essential for product quality, the accuracy of experimental results, and equipment safety. Therefore, collecting data on the internal temperature of the oven serves multiple purposes. First, temperature data acquisition is fundamental to achieving accurate temperature control. By monitoring the temperature of various parts within the oven in real time, the control system can adjust the heating power promptly, ensuring the temperature remains stable within the set range to meet different process requirements. Second, temperature data is a key indicator for evaluating oven performance. Long-term tracking of temperature changes allows for analysis of performance parameters such as heating efficiency and temperature uniformity, providing data support for equipment maintenance and upgrades. Furthermore, temperature data acquisition helps ensure operational safety. Abnormal temperature fluctuations may indicate equipment malfunctions or safety hazards; timely detection and handling can prevent accidents.

[0003] Existing methods for producing tobacco sheets mainly include the roll pressing method, the slurry method, and the papermaking method. Among these, tobacco sheets manufactured using the papermaking method are completely different from those produced using the slurry method. Their physical and filling properties are far superior, effectively reducing tar and harmful substances in cigarette smoke, and thus playing an increasingly important role in cigarette formulations. Because the papermaking reconstituted tobacco production process fully utilizes mature technologies and equipment from the papermaking industry, it has unparalleled advantages in terms of production capacity compared to other reconstituted tobacco types such as the roll pressing and slurry methods. Through a continuous and efficient material processing mode, large-scale production of the product is achieved. Based on the different physicochemical performance requirements of papermaking reconstituted tobacco products, a wide range of process adjustments can be made to each processing stage, including extraction, pulping, and papermaking, to achieve quality control over the product's physical properties, thereby meeting the industrial processing performance needs of cigarette manufacturers for papermaking reconstituted tobacco.

[0004] In the production of tobacco flakes using the papermaking process, drying the flakes typically requires tunnel drying. Traditional drying equipment requires slowly conveying the flakes from the inside of the drying oven, resulting in low drying efficiency. To improve drying efficiency, the temperature of the drying oven and the conveying speed of the flakes need to be increased. However, excessively high oven temperatures can easily cause the flakes to harden and deform.

[0005] To accurately control the drying effect of papermaking sheets, whether the solution uses guide plates to control the hot air flow or divides the tunnel oven into multiple stages and uses independent heat sources for control, the first technical problem to be solved is how to obtain the temperature field inside the tunnel oven.

[0006] On the one hand, tunnel-type sheet drying ovens in the papermaking process are typically equipped with air-uniforming baffles connected to hot air inlets. The hot air passing through these baffles creates an unpredictable temperature field within the oven. Furthermore, existing technologies use adjustable baffles on fixed air-uniforming baffle devices. However, these adjustable baffles can only be adjusted based on localized areas of insufficient or excessive drying in the reconstituted tobacco production process, aiming to achieve lateral uniformity of hot air within the oven. This adjustment cannot provide real-time information about the temperature field within the oven.

[0007] On the other hand, due to the large amount of water vapor generated during the drying process, the oven may become saturated. Traditional ovens require increasing the drying temperature or extending the drying time to remove moisture from the product. Existing technology incorporates a forced dehumidification device, which uses negative pressure at the outlet of each oven to create high-speed airflow, carrying away moisture from the reconstituted tobacco leaves, thus lowering the drying temperature, shortening the drying time, and achieving low-temperature, rapid drying.

[0008] Thirdly, because tobacco materials are naturally grown plants, especially the tobacco scraps used in papermaking, including tobacco stems, dust, and broken tobacco leaves, their moisture release characteristics are extremely inconsistent. In addition, different products use different papermaking sheet formulations and have different moisture contents, resulting in extremely unstable moisture release characteristics after the papermaking sheets are formed.

[0009] The moisture release characteristics of papermaking sheets, the hot air temperature of the drying oven, and the turbulence of the air distribution guide plate complicate the temperature field inside the drying oven, making it difficult to achieve adaptive adjustments for drying papermaking sheets of different specifications by simply adjusting the temperature.

[0010] The existing tunnel-type oven structure cannot install infrared temperature measurement devices inside the oven. Temperature can only be measured at the hot air blower outlet, and the temperature measurement point is about 30m away from the inside of the oven. Furthermore, it is impossible to accurately collect the temperature at various locations inside the tunnel-type oven in real time. Utility Model Content

[0011] The purpose of this invention is to provide a temperature scanning and detection scheme for the drying process of tobacco flakes in papermaking, in order to solve this technical problem:

[0012] This utility model provides a tunnel-type drying oven for papermaking sheets, including a tunnel-type chamber for receiving and drying papermaking sheets. During drying, the papermaking sheets move within the tunnel-type chamber along its length. The oven also includes a temperature scanning device. The temperature scanning device is located inside the tunnel-type chamber and includes a conveying assembly, an internal rotation assembly, a clamping assembly, and a temperature acquisition mechanism. The conveying assembly moves the clamping assembly along the length of the tunnel-type chamber. The internal rotation assembly moves the clamping assembly around a rotation axis parallel to the length of the tunnel-type chamber. The clamping assembly clamps and fixes the temperature acquisition mechanism. The temperature acquisition mechanism collects the temperature in its vicinity and includes a temperature-sensing optical fiber.

[0013] Furthermore, the conveying assembly includes: a conveying slide rail, a threaded rod, and a slide block.

[0014] Furthermore, the conveyor rails are arranged along the length of the tunnel-type box.

[0015] Furthermore, the threaded rod is rotatably connected inside the conveyor slide rail.

[0016] Furthermore, the slide is located on the outside of the threaded rod, and can move and advance within the tunnel-type oven as the threaded rod rotates.

[0017] The inner rotating component is located inside the slide.

[0018] Furthermore, the conveying components also include: forward and reverse motors.

[0019] The forward and reverse motors are fixedly installed on the outside of the conveyor slide rail.

[0020] Furthermore, the output end of the forward and reverse motors is fixedly connected to the threaded rod.

[0021] Furthermore, the conveying assembly also includes threaded grooves.

[0022] Furthermore, the threaded groove is formed on the bottom side of the slide.

[0023] Furthermore, the threaded groove matches the threaded rod.

[0024] Furthermore, the slide is threaded to the outside of the threaded rod via a threaded groove.

[0025] Furthermore, the conveying assembly also includes a protective chamber.

[0026] Furthermore, the protective chamber is fixedly connected to the outside of the slide.

[0027] Furthermore, the interior of the protective chamber is connected to the slide.

[0028] Furthermore, the internal rotating component includes a drive motor and a rotating shaft.

[0029] Furthermore, the drive motor is fixedly installed inside the protective compartment.

[0030] Furthermore, the rotating shaft is fixedly connected to the output end of the drive motor.

[0031] Furthermore, the internal rotating assembly also includes a geared disc.

[0032] Furthermore, the gear disc is located inside the protective compartment.

[0033] Furthermore, the gear plate and the rotating shaft are fixedly connected.

[0034] Furthermore, the inner rotating component also includes an inner rotating ring and balls.

[0035] Furthermore, the inner rotating ring is located on the inner side of the slide.

[0036] Furthermore, the ball bearings are connected to the outer side of the inner rotating ring in a circular rotation.

[0037] Furthermore, the ball comes into contact with the inner wall of the slide.

[0038] Furthermore, the inner rotating ring is rotatably connected to the inside of the slide block via ball bearings.

[0039] Furthermore, the inner rotating assembly also includes a toothed groove assembly and an inner extension plate.

[0040] Furthermore, the tooth grooves are distributed on the outer side of the inner rotating ring.

[0041] Furthermore, the tooth groove assembly is in contact with the toothed disc and is in a meshing rotatable connection.

[0042] Furthermore, the inner extension plate is symmetrically fixedly connected to the inner side of the inner rotating ring.

[0043] Furthermore, the clamping assembly includes: a limiting tube and a spring coil.

[0044] Furthermore, the limiting tube is fixedly connected to the inside of each inner extension plate.

[0045] Furthermore, the spring coil is located inside the limiting tube.

[0046] Furthermore, one end of the spring coil is fixedly connected to the limiting tube, and the other end of the spring coil is fixedly connected to the clamping plate.

[0047] To understand the temperature field within reconstituted tobacco drying ovens and thus better understand and control the product properties and production processes of reconstituted tobacco, the inventors considered fiber optic temperature measurement technology. However, while fiber optic temperature measurement technology offers advantages such as resistance to electromagnetic interference, high temperature resistance, and the ability to perform long-distance distributed measurements, it has not yet been effectively applied in the dynamic three-dimensional temperature field monitoring of tunnel-type sheet drying ovens used in papermaking. Traditional fixed fiber optic deployment schemes are ill-suited to the complex thermal field dynamics within the oven, making it difficult to simultaneously achieve both spatial resolution and dynamic response.

[0048] The inventors of this patent discovered that, due to the different formulations and specifications of papermaking sheets used in different cigarette products, the optimal drying curves for different papermaking sheets in the tunnel drying process have different characteristics. After dividing the tunnel drying process into different zones, the inventors further discovered that papermaking tobacco sheets require lower drying temperatures at the beginning and end of the drying process, while higher drying temperatures can be used in the middle stage. The production process of papermaking sheets involves: applying the prepared pulp to form the sheet through pulping and papermaking, followed by dehydration, coating, and drying to produce the papermaking sheet product. The papermaking sheet drying oven in this patent is used in the drying process to dry and dehydrate the sheets. During this drying and dehydration process, tobacco aroma substances are released. Above 145 degrees Celsius, the higher the temperature, the more tobacco aroma substances are released; below 75 degrees Celsius, the lower the temperature, the less tobacco aroma substances are released.

[0049] Compared to existing technologies, the beneficial effects of this patent are at least as follows:

[0050] Existing tunnel-type drying devices for papermaking sheets cannot precisely measure or adjust the temperature of different drying sections in a distributed manner; they can only measure or adjust the temperature of the entire drying device. This leads to over-drying and hardening of the papermaking sheets after drying, or the need for prolonged low-temperature drying, in order to ensure sufficient drying. This invention upgrades single-point static measurement to a three-dimensional dynamic scanning design, effectively solving the problem of monitoring the thermal field during the drying process of papermaking sheets and providing data support for optimizing the production process.

[0051] To address the limitations of traditional tunnel-type oven temperature measurement devices, which cannot penetrate deep into the oven and can only measure at a single point near the fan outlet (up to 30 meters away), an innovative three-dimensional dynamic temperature acquisition system was designed, achieving three major technological breakthroughs: First, an axial movement platform is constructed using a threaded rod-slide conveyor assembly (including forward and reverse motor drives), enabling the temperature measurement mechanism to be precisely positioned within the 30-meter depth of the oven, overcoming the limitation of fixed-point measurement. Second, a gear-tooth meshing transmission internal rotation assembly, in conjunction with annular ball bearings, enables 360° horizontal rotation adjustment of the temperature probe, forming a spiral scanning path. Third, an innovative non-linear spring clamping structure adaptively clamps sensors of different specifications through a helical spring coil within the limiting tube, maintaining stable contact even under equipment vibration conditions.

[0052] The paper-making sheet referred to in this patent is a type of tobacco sheet. The paper-making reconstituted tobacco sheet uses tobacco materials or tobacco waste from cigarette manufacturing processes, such as tobacco dust, stems, tobacco leaf fragments, and some low-grade tobacco leaves, as raw materials. After soaking in water, solid-liquid separation is performed to separate the water-soluble and insoluble substances in the tobacco. The insoluble substances are pulped and then processed into fiber substrate using a papermaking machine, while the water-soluble substances are concentrated, reduced, and added to the substrate. Finally, after drying, the paper-making sheet is obtained. On the one hand, the paper-making sheet maximizes the utilization of tobacco raw materials, saving on cigarette costs. On the other hand, the paper-making sheet plays an important role in reducing the release of tar from cigarettes and thus reducing the harm of cigarettes.

[0053] The typical preparation method for tobacco sheets using the papermaking process involves the following steps: First, tobacco materials (tobacco stems, tobacco leaf fragments) are extracted by soaking in hot water. A solid-liquid separation step separates the water-soluble tobacco components from the insoluble components such as tobacco fibers. The resulting fibers are formed into sheet bases on a paper machine. The water-soluble components are then concentrated by distillation to obtain a tobacco concentrate. This concentrate is then impregnated or sprayed onto the sheet base, and finally dried to form tobacco sheets. Traditional processes for manufacturing tobacco sheets using the papermaking method borrow from papermaking techniques. Attached Figure Description

[0054] The above description of this utility model and the following detailed embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are merely examples of the claimed technical solution.

[0055] Figure 1 This is a schematic diagram of the tunnel-type papermaking sheet drying oven of this patent;

[0056] Figure 2 This is a schematic diagram of the temperature scanning device of this patent;

[0057] Figure 3 This is a front view of the slide of this patent;

[0058] Figure 4 for Figure 3 Enlarged view of region A;

[0059] Figure 5 This is a schematic diagram of the internal transfer component of this patent.

[0060] Explanation of reference numerals in the attached figures:

[0061] 1. Conveying components;

[0062] 11. Conveyor rails;

[0063] 12. Reverse motor;

[0064] 121. Threaded rod;

[0065] 13. Slide;

[0066] 131. Threaded groove;

[0067] 14. Protective compartment;

[0068] 2. Internal transfer component;

[0069] 21. Inner rotating loop;

[0070] 211. Inward extension plate;

[0071] 212. Gear set;

[0072] 213. Ball bearings;

[0073] 22. Drive motor;

[0074] 221. Shaft;

[0075] 222. Gear disc;

[0076] 3. Clamping components;

[0077] 31. Limiting tube;

[0078] 311. Spring coil;

[0079] 32. Clamping plate. Detailed Implementation

[0080] The present invention will now be described with reference to the accompanying drawings, in which similar reference numerals denote similar elements. While specific structures and arrangements are discussed, it should be understood that this is done merely for illustrative purposes. Those skilled in the art will recognize that other structures and arrangements can be used without departing from the spirit and scope of the present invention. It will be apparent to those skilled in the art that the present invention can also be used in a variety of other applications.

[0081] General definition

[0082] In this specification and claims, several terms will be used, and unless otherwise indicated, these terms will be defined to have the following meanings:

[0083] The terms “comprising” or “having” have the same meaning as “containing” as defined above, and also include other forms of the term, such as the gerund and singular forms in English, meaning including but not limited to, and not intended to exclude, for example, other elements, components, integers or steps.

[0084] The singular forms “a” and “the” include their corresponding plural forms. “At least one” means one or more, and “more” means two or more. “At least one of the following” or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can be expressed as: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0085] This patent provides a tunnel-type drying oven for papermaking sheets, including a tunnel-type chamber for receiving and drying papermaking sheets, wherein the papermaking sheets move within the tunnel-type chamber along the length of the tunnel-type chamber during the drying process.

[0086] The tunnel-type sheet drying oven for papermaking also includes a temperature scanning device.

[0087] The temperature scanning device is located inside the tunnel-type enclosure. The temperature scanning device includes a conveying component 1, an inner rotating component 2, a clamping component 3, and a temperature acquisition mechanism. The conveying component 1 is used to move the clamping component 3 along the length of the tunnel-type enclosure. The inner rotating component 2 is used to move the clamping component around a rotating axis, which is parallel to the length of the tunnel-type enclosure. The clamping component 3 is used to clamp and fix the temperature acquisition mechanism. The temperature acquisition mechanism is used to collect the temperature in its vicinity, including a temperature-measuring optical fiber.

[0088] Please see Figure 1 and Figure 2 and Figure 3 and Figure 4 and Figure 5 This patent provides a specific embodiment: a tunnel-type papermaking sheet drying oven, including a conveying assembly 1, which includes a conveying slide rail 11 disposed inside the tunnel-type drying oven. A threaded rod 121 is rotatably connected inside the conveying slide rail 11. A slide block 13 is disposed outside the threaded rod 121 and can rotate and move forward within the tunnel-type drying oven with the threaded rod 121. An inner rotating assembly 2 is disposed inside the slide block 13 and can rotate to flexibly adjust the temperature acquisition position. A clamping assembly 3 is disposed inside the inner rotating assembly 2 and can clamp and fix the temperature acquisition mechanism.

[0089] This design solves the problem in existing tunnel oven structures that cannot accommodate infrared temperature sensors inside the oven, allowing temperature measurements only to be taken at the hot air blower outlet, thus preventing real-time and accurate temperature acquisition at various locations within the tunnel oven.

[0090] Please see Figure 1 and Figure 2 and Figure 3The conveying assembly 1 also includes a forward and reverse motor 12, meaning the motor 12 can rotate in both directions, such as clockwise and counterclockwise. Clockwise rotation is forward rotation, and counterclockwise rotation is reverse rotation. Those skilled in the art can analyze the forward and reverse control circuit diagram and its principles to realize that to achieve forward and reverse rotation of the motor, simply swap any two of the three-phase power supply lines connected to the motor. The forward and reverse motor 12 is fixedly installed on the outside of the conveying slide rail 11 to drive the threaded rod 121 with high mechanical efficiency. Specifically, the output end of the forward and reverse motor 12 is fixedly connected to the threaded rod 121.

[0091] Specifically, the conveying assembly 1 further includes a threaded groove 131 formed on the bottom side of the slide 13. The threaded groove 131 matches the threaded rod 121, that is, the threaded groove 131 is threadedly connected to the threaded rod 121, so that when the threaded rod 121 and the threaded groove 131 rotate relative to each other, the threaded rod 121 and the threaded groove 131 will have relative displacement. The slide 13 is threadedly connected to the outside of the threaded rod 121 through the threaded groove 131, that is, when the threaded rod 121 and the threaded groove 131 rotate relative to each other, and the threaded rod 121 and the threaded groove 131 have relative displacement, the slide 13 will also have corresponding displacement.

[0092] Specifically, the conveying assembly 1 also includes a protective chamber 14 fixedly connected to the outside of the slide 13. The interior of the protective chamber 14 is connected to the slide 13. The protective chamber 14 is equipped with an optical fiber take-up and take-up mechanism, and the length of the optical fiber that moves synchronously with the slide 13 is adaptively adjusted.

[0093] In summary, this patent facilitates the construction of fiber optic temperature measurement networks with spatial coordinate calibration, upgrading single-point static measurement to a three-dimensional dynamic scanning design.

[0094] This design allows the slide 13 to drive the inner rotating component 2 and the temperature acquisition mechanism installed on the outside of the inner rotating component 2 to move quickly to the area to be collected in the tunnel oven.

[0095] Please see Figure 5 The internal rotating assembly 2 includes: a drive motor 22 fixedly installed inside the protective chamber 14, and a rotating shaft 221 fixedly connected to the output end of the drive motor 22.

[0096] Specifically, the inner rotating assembly 2 further includes a geared disc 222 disposed within the protective chamber 14. The geared disc 222 is fixedly connected to the rotating shaft 221. The inner rotating assembly 2 also includes an inner rotating ring 21 disposed inside the slide 13. A ball bearing 213 is rotatably connected to the outside of the inner rotating ring 21 in a ring shape. The ball bearing 213 contacts the inner wall of the slide 13.

[0097] The inner rotating ring 21 is rotatably connected to the inner side of the slide block 13 via the ball bearing 213.

[0098] Specifically, the inner rotating assembly 2 also includes a toothed groove group 212 distributed on the outer side of the inner rotating ring 21. The toothed groove group 212 is in contact with the toothed disk 222 and is meshed and rotatably connected. When the inner rotating ring 21 is advanced into the area to be sampled in the tunnel oven by the conveying assembly 1, the inner rotating ring 21 can be driven by the drive motor 22 and the meshing action of the toothed disk 222 and the toothed groove group 212 to rotate the temperature acquisition mechanism in the slide 13. This design allows for flexible adjustment of the temperature acquisition position.

[0099] Specifically, the inner rotating assembly 2 also includes an inner extension plate 211 symmetrically and fixedly connected to the inner side of the inner rotating ring 21. (See also...) Figure 4 The clamping assembly 3 includes: a limiting tube 31 fixedly connected to the inner side of each inner extension plate 211, and a spring coil 311 disposed inside the limiting tube 31. One end of the spring coil 311 is fixedly connected to the limiting tube 31. The other end of the spring coil 311 is fixedly connected to the clamping plate 32. When a temperature-sensing optical fiber is installed in the clamping plate 32, the clamping plate 32 is pushed to both sides, and the spring coil 311 is compressed, resulting in a center-directing elastic stress in the spring coil 311. This design allows for the clamping and fixing of the temperature acquisition mechanism based on the elastic stress of the spring coil 311. Advantageously, this clamping and fixing operation is a flexible system. By using the flexible spring coil 311 in conjunction with the clamping plate 32 to clamp the temperature-sensing optical fiber, the temperature-sensing optical fiber can be kept in an acceptable temperature-sensing state.

[0100] The clamping assembly 3 is fixedly equipped with a distributed fiber optic temperature sensor, which realizes axial temperature gradient detection through a fiber optic grating array.

[0101] Specifically, the temperature acquisition mechanism is used to acquire the temperature in its vicinity, including a temperature-sensing optical fiber. More specifically, the clamping assembly 3 holds the temperature acquisition mechanism, which includes a distributed optical fiber temperature sensor. Preferably, the distributed optical fiber temperature sensor comprises at least 50 temperature-sensing nodes. Preferably, the node spacing is adjustable from 10 to 50 cm.

[0102] More specifically, the protective chamber 14 is equipped with an optical fiber take-up and take-up mechanism for adjusting the node spacing, including a servo winding system that is linked to the displacement of the slide 13.

[0103] Working principle:

[0104] The staff first laid the conveyor rail 11 inside the tunnel oven, then took out the temperature acquisition mechanism and pushed it between the two sets of inner extension plates 211. At this time, the spring ring 311 elastically squeezed and clamped the temperature acquisition mechanism through the clamping plate 32.

[0105] Specifically, starting the forward and reverse motor 12 drives the threaded rod 121 to rotate, which in turn causes the slide 13, which is threaded to the outside of the threaded rod 121, to move the inner rotating component 2 and the temperature acquisition mechanism inside the tunnel oven. When it moves to the target temperature acquisition area, the drive motor 22 can be started to drive the rotating shaft 221 to rotate. At this time, under the meshing action of the gear plate 222 and the tooth groove group 212, the inner rotating ring 21 can rotate inside the slide 13. Through this design, the temperature acquisition position of the temperature acquisition mechanism inside the tunnel oven can be flexibly adjusted.

[0106] Specifically, the temperature acquisition mechanism held by the clamping component 3 includes a distributed optical fiber temperature sensor. The temperature measuring optical fiber is an armored high-temperature resistant optical fiber, and the optical fiber is engraved with an equally spaced FBG grating array, with an adjacent grating spacing of 10cm.

[0107] The protective chamber 14 is equipped with an optical fiber winding device, including a servo motor-driven winding reel, which winds up and unwinds the optical fiber in real time, matching the displacement of the sliding seat. It is readily understood that other optical fiber winding and unwinding mechanisms are readily available to those skilled in the art, and their specific structures do not affect the realization of this invention.

[0108] The temperature-measuring optical fiber, i.e., the optical fiber signal transmission line, is connected to the external demodulator through a pre-set threading channel inside the conveyor slide rail 11. The threading channel is filled with high-temperature resistant ceramic fiber insulation material. When the slide 13 moves along the depth of the 30m oven, the optical fiber winding mechanism obtains the slide position in real time through an encoder, controls the winding speed of the winding reel, maintains the bending radius of the optical fiber greater than 5cm, ensures the stability of optical signal transmission, and achieves stable, accurate, and comprehensive temperature measurement.

[0109] The description of embodiments of this patent references Marks' Standard Handbook for Mechanical Engineers (11th edition and other editions prior to the filing date of this application), published by McGraw-Hill, Inc.; DeGarmo's Materials and Processes in Manufacturing (13th edition and other editions prior to the filing date of this application), published by Wiley; Machinery's Handbook (32nd edition and other editions prior to the filing date of this application), published by Industrial Press Inc.; Mechanical Design Handbook (6th edition and other editions prior to the filing date of this application), edited by Cheng Daxian, published by Chemical Industry Press; and Modern Mechanical Design Handbook (6th edition and other editions prior to the filing date of this application), edited by Wen Bangchun, published by Machinery Industry Press.

[0110] Similarly, it should be noted that although the present invention has been described with reference to the specific embodiments described above, those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and various equivalent changes or substitutions can be made without departing from the spirit of the present invention. Therefore, any changes or modifications to the above embodiments within the scope of the essential spirit of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A tunnel-type papermaking sheet drying oven comprising a tunnel-type housing for receiving a papermaking sheet and drying the papermaking sheet, the papermaking sheet moving in a lengthwise direction of the tunnel-type housing within the tunnel-type housing during the drying, characterized by, The tunnel-type papermaking sheet drying oven also includes a temperature scanning device; ​ The temperature scanning device is located inside the tunnel-type box and includes a conveying component (1), an internal transfer component (2), a clamping component (3), and a temperature acquisition mechanism. The conveying assembly (1) is used to move the clamping assembly (3) along the length of the tunnel-type box. The inner rotating component (2) is used to move the clamping component around the rotating axis, which is parallel to the length direction of the tunnel-type box. The clamping assembly (3) is used to clamp and fix the temperature acquisition mechanism; The temperature acquisition mechanism is used to collect the temperature in its vicinity, including a temperature-sensing optical fiber.

2. The tunnel-type sheet drying oven for papermaking according to claim 1, characterized in that, The conveying assembly (1) includes: a conveying slide rail (11), a threaded rod (121), and a slide block (13); The conveying slide rail (11) is arranged along the length of the tunnel-type box; The threaded rod (121) is rotatably connected inside the conveying slide rail (11); The slide (13) is located outside the threaded rod (121) and can move and advance inside the tunnel oven as the threaded rod (121) rotates; The inner rotating component (2) is disposed inside the slide (13).

3. The tunnel-type sheet drying oven for papermaking according to claim 2, characterized in that, The conveying assembly (1) also includes: a forward and reverse motor (12); The forward and reverse motors (12) are fixedly installed on the outside of the conveying slide rail (11); The output end of the forward and reverse motor (12) is fixedly connected to the threaded rod (121).

4. The tunnel-type papermaking sheet drying oven according to claim 3, characterized in that, The conveying assembly (1) also includes a threaded groove (131); The threaded groove (131) is formed on the bottom side of the slide (13); The threaded groove (131) matches the threaded rod (121); The slide (13) is threaded to the outside of the threaded rod (121) via a threaded groove (131).

5. The tunnel-type sheet drying oven for papermaking according to claim 2, characterized in that, The conveying assembly (1) also includes a protective chamber (14); The protective chamber (14) is fixedly connected to the outside of the slide (13); The protective chamber (14) is connected to the slide (13).

6. The tunnel-type sheet drying oven for papermaking according to claim 5, characterized in that, The inner rotating assembly (2) includes a drive motor (22) and a rotating shaft (221). The drive motor (22) is fixedly installed inside the protective compartment (14); The rotating shaft (221) is fixedly connected to the output end of the drive motor (22).

7. The tunnel-type sheet drying oven for papermaking according to claim 6, characterized in that, The inner rotating component (2) also includes a toothed disk (222); The toothed disc (222) is located inside the protective chamber (14); The gear disc (222) and the rotating shaft (221) are fixedly connected.

8. The tunnel-type sheet drying oven for papermaking according to claim 7, characterized in that, The inner rotating assembly (2) also includes an inner rotating ring (21) and a ball bearing (213). The inner rotating ring (21) is located inside the slide (13); The ball bearing (213) is rotatably connected to the outer side of the inner rotating ring (21) in a ring shape; The ball (213) is in contact with the inner wall of the slide (13); The inner rotating ring (21) is rotatably connected to the inner side of the slide (13) via the ball bearing (213).

9. The tunnel-type sheet drying oven for papermaking according to claim 8, characterized in that, The inner rotating assembly (2) also includes a toothed groove assembly (212) and an inner extension plate (211). The toothed groove group (212) is distributed on the outside of the inner rotating ring (21); The toothed groove group (212) is in contact with the toothed disc (222) and is in a meshing rotatable connection; The inner extension plate (211) is symmetrically fixedly connected to the inner side of the inner rotating ring (21).

10. The tunnel-type sheet drying oven for papermaking according to claim 9, characterized in that, The clamping assembly (3) includes: a limiting tube (31), a spring coil (311), and a clamping plate (32); The limiting tube (31) is fixedly connected to the inner side of each of the inner extension plates (211); The spring coil (311) is disposed inside the limiting tube (31); One end of the spring coil (311) is fixedly connected to the limiting tube (31), and the other end of the spring coil (311) is fixedly connected to the clamping plate (32).

Images