A device for detecting the folding endurance of reconstituted tobacco leaf
By designing a device for testing the folding endurance of reconstituted tobacco leaves, and employing a bearing surface and negative pressure adsorption method, the problems of inaccurate testing and sample damage in existing technologies have been solved, achieving higher testing accuracy and sample integrity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHENGZHOU TOBACCO RES INST OF CNTC
- Filing Date
- 2025-06-18
- Publication Date
- 2026-06-05
AI Technical Summary
Existing technologies lack standardized equipment suitable for testing the folding endurance of reconstituted tobacco leaves. Traditional testing methods cannot accurately reflect the actual performance of reconstituted tobacco leaves and are prone to damaging samples.
It employs two bearing surfaces connected by a pivot hinge, combined with a negative pressure adsorption fixing component and a folding drive component to achieve a gentle folding action, and integrates a controller and sensors for data recording.
This improved the accuracy and sample integrity of reconstituted tobacco leaf folding endurance testing, avoided localized damage, and enabled more precise data recording.
Smart Images
Figure CN224328006U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tobacco industry quality testing technology, specifically, to a device for testing the folding endurance of reconstituted tobacco leaves. Background Technology
[0002] Reconstituted tobacco is a key raw material in cigarette manufacturing. Its folding endurance directly affects the breakage rate of the sheets and the stability of equipment operation during the production process. Specifically, its impact is mainly reflected in the following aspects:
[0003] (1) Shredding efficiency and equipment stability: Reconstituted tobacco leaves with low folding endurance are prone to breakage or delamination due to mechanical stress during the shredding process. Frequent breakage can lead to blockage of the shredding machine, requiring frequent shutdowns for cleaning, which significantly reduces production efficiency. According to statistics, if the folding endurance of the sheet is insufficient, the equipment downtime rate may increase by more than 30%. Furthermore, broken sheet fragments will accelerate the wear of the shredding blades, shorten the blade life, and increase equipment maintenance costs.
[0004] (2) Transportation: Reconstituted tobacco leaves with good folding resistance can maintain good integrity even if they are subjected to a certain degree of bumps, vibrations and compression during loading, unloading and transportation, reducing weight loss and quality decline caused by tobacco leaf breakage and breakage, and resulting in less transportation loss.
[0005] (3) Subsequent storage time and conditions: Reconstituted tobacco leaves with high folding endurance can withstand long-term stacking pressure without significant deformation or damage during storage, which is conducive to long-term storage and efficient use of storage space.
[0006] In summary, folding endurance is one of the core control indicators in the reconstituted tobacco shredding process, and its accurate detection and optimization play a crucial role in improving production efficiency, reducing costs, and ensuring product quality.
[0007] However, the tobacco industry currently lacks standardized testing methods for the folding endurance of reconstituted tobacco leaves. In practice, the folding endurance testing standards of the paper industry (such as GB / T 457-2008 and ISO 5626) are often directly applied, using the MIT folding endurance meter for testing. Using this method to test reconstituted tobacco leaves has the following significant drawbacks:
[0008] 1. Mismatch in force range: The mechanical strength of reconstituted tobacco is much lower than that of ordinary paper (usually 1 / 5 to 1 / 10 of the strength of paper), while the design force range of testing instruments in the paper industry is relatively large (usually 1N to 10N). Even when the instrument is adjusted to the minimum test force (e.g., 0.1N), the clamping tension and folding stress of reconstituted tobacco still far exceed its bearing threshold due to its weak ability to withstand the applied force. This causes the sample to break during the initial folding stage, making it impossible to obtain effective test data.
[0009] 2. Folding mode is not applicable: Traditional folding endurance testers use 135° reciprocating folding, and the folding curvature radius and angle design are based on the high toughness of paper. However, reconstituted tobacco leaves are more brittle and harder than paper, and the fiber bonding is weaker. This type of folding method is prone to causing surface cracking or interlayer delamination of the sample, which is seriously inconsistent with the flexible bending stress conditions of the sheet in the actual production process of cigarette machines. As a result, the test results cannot truly reflect the application performance of the sheet.
[0010] For the reasons mentioned above, there is currently no dedicated equipment suitable for testing the folding endurance of reconstituted tobacco leaves.
[0011] Analysis of the requirements for folding endurance testing of reconstituted tobacco leaves reveals that the equipment needed for this test must address at least the following aspects:
[0012] First, it is necessary to consider that the tension value of reconstituted tobacco leaves during the folding process should not be too large, otherwise the reconstituted tobacco leaves will easily be torn apart.
[0013] Secondly, it is necessary to consider that the fixing or clamping force on the reconstituted tobacco leaves should not be too great, as this can easily cause local breakage.
[0014] Another consideration is that reconstituted tobacco leaves are relatively large, requiring a correspondingly sized support surface.
[0015] Finally, we need to consider how to implement the folding action so that the repeated folding process can be completed with as few other interferences as possible. Utility Model Content
[0016] The purpose of this invention is to address the shortcomings of existing technologies by providing a reconstituted tobacco leaf folding endurance testing device that is suitable for testing tobacco leaf folding endurance, does not easily damage reconstituted tobacco leaves, and has higher testing accuracy.
[0017] To achieve the above objectives, the technical solution adopted by this utility model is: a reconstituted tobacco leaf folding endurance testing device, comprising a first bearing surface, a second bearing surface, a folding drive assembly, and an adsorption and fixing assembly;
[0018] The adjacent sides of the first bearing surface and the second bearing surface are hinged together by a pivot to form a folding mechanism;
[0019] The folding drive assembly is used to drive the first bearing surface and the second bearing surface to complete the folding and unfolding actions;
[0020] The adsorption and fixation assembly includes negative pressure adsorption holes disposed on the first bearing surface and the second bearing surface, and negative pressure channels disposed inside the first bearing surface and the second bearing surface, wherein the negative pressure channels are used to connect to an external negative pressure source.
[0021] Based on the above, one of the first bearing surface and the second bearing surface is a fixed bearing surface, and the other bearing surface is a movable bearing surface.
[0022] Based on the above, the fixed bearing surface is horizontally arranged, and the side of the movable bearing surface is hinged to the adjacent side of the fixed bearing surface via a pivot.
[0023] Based on the above, the folding drive assembly includes a motor for driving the rotating shaft to rotate, the rotating shaft being mounted on the side of the fixed bearing surface via bearings, and the rotating shaft being fixed to the side of the movable bearing surface.
[0024] Based on the above, the motor is a servo motor or a stepper motor.
[0025] Based on the above, the negative pressure adsorption holes are evenly distributed on the surfaces of the first and second bearing surfaces.
[0026] Based on the above, the negative pressure channel inside the first bearing surface and the second bearing surface is a cavity that connects each negative pressure adsorption hole on the corresponding bearing surface, and an external hole is opened on the side or bottom of the cavity.
[0027] Based on the above, the maximum folding angle of the first bearing surface and the second bearing surface is 180° and the minimum folding angle is 0°.
[0028] Based on the above, it also includes a controller, a display, and a counting sensor. The controller is used to connect to the working status of the folding drive assembly, the counting sensor is used to detect the number of folds on the first bearing surface and the second bearing surface, and the display is used to display parameter information.
[0029] Based on the above, it also includes a host platform, in which the controller, display, counting sensor, first bearing surface, second bearing surface and folding drive assembly are all integrated.
[0030] This utility model has substantial features and progress compared to the prior art. Specifically, this utility model has the following advantages:
[0031] 1. Since reconstituted tobacco leaves can better reflect their performance when the sampling area is relatively large, the method of using two bearing surfaces to support the reconstituted tobacco leaves and then driving the two bearing surfaces to complete the folding action to perform the folding endurance test is more in line with the characteristics and needs of reconstituted tobacco leaves themselves.
[0032] 2. The reconstituted tobacco leaves are supported by a bearing surface and fixed by negative pressure adsorption. Since the negative pressure adsorption holes are relatively dispersed, the negative pressure of each hole can be set relatively small, thus achieving full fixation of the reconstituted tobacco leaves as a whole. This design method eliminates the need to apply tension to the reconstituted tobacco leaves and avoids the risk of breakage caused by local clamping of the reconstituted tobacco leaves, thus maintaining the natural shape of the reconstituted tobacco leaves to the greatest extent.
[0033] 3. By adopting the folding method of this scheme, from the perspective of stress analysis of reconstituted tobacco leaves, the folded area of reconstituted tobacco leaves is only affected by the folding force and is not easily disturbed by other external forces, resulting in more accurate folding endurance data.
[0034] 4. The integrated controller, display, and counting sensor form a single unit, making it more convenient to use. Attached Figure Description
[0035] Figure 1 This is one of the schematic diagrams of the reconstituted tobacco leaf folding endurance testing device in this utility model.
[0036] Figure 2 This is the second schematic diagram of the reconstituted tobacco leaf folding endurance testing device in this utility model.
[0037] Figure 3 This is a partial structural schematic diagram of the first bearing surface in this utility model.
[0038] Figure 4 This is a schematic diagram of the overall structure of the reconstituted tobacco leaf folding endurance testing device in this utility model.
[0039] In the figure: 1. First bearing surface; 2. Second bearing surface; 3. Folding drive assembly; 4. Rotary shaft; 5. Negative pressure adsorption hole; 6. Negative pressure channel; 7. Display; 8. Main unit platform. Detailed Implementation
[0040] The technical solution of this utility model will be further described in detail below through specific embodiments.
[0041] like Figures 1-4 As shown, a device for testing the folding endurance of reconstituted tobacco leaves includes a first bearing surface 1, a second bearing surface 2, a folding drive assembly 3, and an adsorption and fixing assembly.
[0042] The adjacent sides of the first bearing surface 1 and the second bearing surface 2 are hinged together by a pivot 4 to form a folding mechanism. In this embodiment, to simplify the folding action, the first bearing surface 1 is designed as a fixed surface, which is set horizontally and its position is fixed. The pivot 4 is installed on the side of the first bearing surface through a bearing. The second bearing surface 2 is designed as a movable surface. The side of the second bearing surface is fixed to the pivot 4, so that the second bearing surface 2 can swing about the bearing of the first bearing surface 1 as the center. The first bearing surface 1 and the second bearing surface 2 are combined to complete the folding action.
[0043] The folding drive assembly 3 is used to drive the first bearing surface 1 and the second bearing surface 2 to complete the folding and unfolding actions. In this embodiment, the folding drive assembly 3 can be set as a stepper motor. The stepper motor has high running accuracy and can accurately control angular displacement information. It has relatively higher control accuracy for the folding angle. In terms of connection method, the output shaft of the stepper motor is connected to the rotating shaft 4 through common means such as direct connection, reducer or coupling to realize the transmission of force.
[0044] In other embodiments, the folding drive assembly 3 may also employ a servo motor, which has high flexibility, can easily adjust speed and torque, and responds relatively quickly.
[0045] The adsorption and fixation assembly includes negative pressure adsorption holes 5 disposed on the first bearing surface 1 and the second bearing surface 2, and negative pressure channels 6 disposed inside the first bearing surface and the second bearing surface, wherein the negative pressure channels 6 are used to connect to an external negative pressure source.
[0046] In this embodiment, the negative pressure adsorption holes 5 are evenly and densely distributed on the first bearing surface 1 and the second bearing surface 2. By dispersing the distribution, the force is dispersed, so that the negative pressure on the reconstituted tobacco leaf is minimized locally, while forming a relatively stable overall negative pressure to ensure the integrity of the reconstituted tobacco leaf.
[0047] The negative pressure channel 6 inside the first bearing surface 1 and the second bearing surface 2 is a cavity that connects to each negative pressure adsorption hole on the corresponding bearing surface. An external connection hole is opened on the side or bottom of the cavity. The external connection hole is used to connect to an external negative pressure source, such as a negative pressure pump or other equipment.
[0048] In terms of stroke control, the maximum folding angle of the first bearing surface 1 and the second bearing surface 2 is 180°, and the minimum folding angle is 0°. This design is based on the definition of folding endurance. Generally, folding endurance refers to a material's ability to resist repeated folding without breaking under specific conditions. It is an important indicator of a material's flexibility and durability, usually expressed as the number of double folds (180° reciprocating folds count as one) the material can withstand before breaking. Therefore, limiting the maximum and minimum folding angles of the first bearing surface 1 and the second bearing surface 2 ensures that folding endurance is fully achieved.
[0049] Working principle explanation:
[0050] In the initial state, the first bearing surface 1 and the second bearing surface 2 are at 180°. Take a reconstituted tobacco leaf of appropriate size, determine its folding area, and then attach one half of the folding area as the central axis to the first bearing surface and the other half to the second bearing surface. The reconstituted tobacco leaf is fixed under the negative pressure adsorption force of the negative pressure adsorption hole 5.
[0051] Start the folding drive assembly 3 to begin the folding action. During the process, a designated person records the number of folds and observes the condition of the folded area of the reconstituted tobacco. When the folded area of the reconstituted tobacco breaks, stop the machine, record the data, replace the reconstituted tobacco, and repeat the test. After the test of the same batch is completed, determine the folding endurance data of the reconstituted tobacco based on the recorded results.
[0052] In a preferred embodiment, to make the device easier to use, a controller, a display, and a counting sensor are also provided. The controller is used to connect to the working status of the folding drive assembly, such as parameter information like folding frequency, folding angle, number of folds, and folding speed, as well as the most basic start-stop control information.
[0053] The counting sensor is used to detect the number of folds of the first bearing surface and the second bearing surface. The counting sensor can be an infrared, laser or other sensor used to detect the number of swings of the second bearing surface, or it can be a switch signal acquisition component built into the folding drive component circuit. The number of folds is recorded by acquiring the number of forward and reverse rotations of the stepper motor or servo motor.
[0054] The display is used to display parameter information, such as the number of folds, folding speed, frequency, etc. The durability calculation method can also be formed into an algorithm program and built into the controller program, and displayed directly on the display.
[0055] For ease of carrying and use, it also includes a main unit platform 8. The controller, display 7, counting sensor, first bearing surface, second bearing surface and folding drive assembly are all integrated into the main unit platform. It can also be equipped with a small negative pressure pump as a negative pressure power source to form an integrated machine, which is convenient for transfer and application in different scenarios.
[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.
Claims
1. A device for testing the folding endurance of reconstituted tobacco leaves, characterized in that: It includes a first bearing surface, a second bearing surface, a folding drive assembly, and an adsorption and fixing assembly; The adjacent sides of the first bearing surface and the second bearing surface are hinged together by a pivot to form a folding mechanism; The folding drive assembly is used to drive the first bearing surface and the second bearing surface to complete the folding and unfolding actions; The adsorption and fixation assembly includes negative pressure adsorption holes disposed on the first bearing surface and the second bearing surface, and negative pressure channels disposed inside the first bearing surface and the second bearing surface, wherein the negative pressure channels are used to connect to an external negative pressure source.
2. The reconstituted tobacco leaf folding endurance testing device according to claim 1, characterized in that: One of the first bearing surface and the second bearing surface is a fixed bearing surface, and the other bearing surface is a movable bearing surface.
3. The reconstituted tobacco leaf folding endurance testing device according to claim 2, characterized in that: The fixed bearing surface is horizontally arranged, and the side of the movable bearing surface is hinged to the adjacent side of the fixed bearing surface via a pivot.
4. The reconstituted tobacco leaf folding endurance testing device according to claim 2 or 3, characterized in that: The folding drive assembly includes a motor for driving the rotating shaft to rotate, the rotating shaft being mounted on the side of the fixed bearing surface via bearings, and the rotating shaft being fixed to the side of the movable bearing surface.
5. The reconstituted tobacco leaf folding endurance testing device according to claim 4, characterized in that: The motor is either a servo motor or a stepper motor.
6. The reconstituted tobacco leaf folding endurance testing device according to claim 1, 2, or 3, characterized in that: The negative pressure adsorption holes are evenly distributed on the surfaces of the first and second bearing surfaces.
7. The reconstituted tobacco leaf folding endurance testing device according to claim 6, characterized in that: The negative pressure channel inside the first and second bearing surfaces is a cavity that connects to each negative pressure adsorption hole on the corresponding bearing surface, and an external hole is opened on the side or bottom of the cavity.
8. The reconstituted tobacco leaf folding endurance testing device according to claim 1, characterized in that: The maximum folding angle of the first bearing surface and the second bearing surface is 180° and the minimum folding angle is 0°.
9. The reconstituted tobacco leaf folding endurance testing device according to any one of claims 1, 2, 3, 5, 7, or 8, characterized in that: It also includes a controller, a display, and a counting sensor. The controller is used to connect to the working status of the folding drive assembly, the counting sensor is used to detect the number of folds on the first and second bearing surfaces, and the display is used to display parameter information.
10. The reconstituted tobacco leaf folding endurance testing device according to claim 9, characterized in that: It also includes a host platform, in which the controller, display, counting sensor, first bearing surface, second bearing surface and folding drive assembly are all integrated.