A pressure testing device, a tobacco mass preparation system and applications

Abstract

This invention discloses a pressure testing device, a tobacco slurry preparation system, and its applications. The pressure testing device includes a loading mechanism, an automatic pressing unit, a control system, and a pressure sensing mechanism. The loading mechanism contains loose tobacco material, which is pressed to form tobacco slurries. The automatic pressing unit is connected to the loading mechanism and is driven by the control system to press the loose tobacco material within the loading mechanism. The pressure sensing mechanism measures the pressure exerted on the loose tobacco material during the pressing process. Before preparing samples of loose tobacco with unknown properties, the pressure testing device is used to investigate the control parameters for the tobacco slurry preparation process. Experimental tobacco slurries are obtained by pressing the loose tobacco material using the pressure testing device to determine the sample preparation control parameters for achieving uniform density distribution of the material. Then, using the obtained sample preparation control parameters, a different preparation device is used to obtain tobacco slurries for measuring thermophysical parameters.

Description

Technical Field

[0001] This invention relates to the field of novel tobacco technology, and in particular to a pressure testing device, a tobacco slurry preparation system, and their applications. Background Technology

[0002] Since heated tobacco products (HNB) rely on the heat from the heating element of the smoking device to cause the chemical substances in the tobacco to evaporate and produce smoke, the heat transfer properties of the tobacco material are a major factor affecting smoke quality (the amount of smoke produced, the concentration of smoke, the stability of smoke release, and the chemical composition of the smoke, etc.). The thermophysical parameters of the tobacco material are measured as follows: thermal conductivity (W / mK), thermal diffusivity (mm²). 2 / s), specific heat of volume (MJ / m 3 Heat transfer properties (TTP) are an important tool for evaluating and studying the heat transfer performance of tobacco materials. Changes in the heat transfer performance of tobacco materials are affected by many factors: in addition to factors such as tobacco formulation, type and proportion of additives, and moisture content, they are also related to factors such as the appearance, packing density, and distribution of the material.

[0003] When compressing loose, fibrous tobacco into blocks of a specific volume for thermophysical property measurement, uneven density distribution along the compression direction is common. This is primarily because tobacco shreds have a low modulus of resilience, resulting in uneven pressure distribution along the transmission direction. Shreds near the pressure surface are compressed and deformed first (increasing density). The deformed portion gradually reduces its compression ratio under its own rebound force, then transmits the pressure further away until the target volume is achieved. This results in the highest density near the pressure surface and a relatively lower density further away. The uniformity of the block density distribution is also related to the compression speed, whether vibration is applied to the system during compression (including vibration frequency, amplitude, and duration), and the period of static equilibrium. Summary of the Invention

[0004] The purpose of this invention is to provide a pressure testing device, a tobacco slurry preparation system, and its application, so as to prevent uneven material density distribution of loose tobacco during the pressing process.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A pressure testing device is provided for a tobacco slurry preparation system. The pressure testing device includes a loading mechanism, an automatic pressing unit, a control system, and a pressure sensing mechanism. The loading mechanism contains loose tobacco material, which is pressed to form tobacco slurry. The automatic pressing unit is connected to the loading mechanism and is driven by the control system to press the loose tobacco material in the loading mechanism. The pressure sensing mechanism is used to measure the pressure on the loose tobacco material during the pressing process.

[0007] Furthermore, the automatic pressing unit drives the tobacco slurry in the loading mechanism to move relative to each other at both ends along the pressing direction, thereby pressing the tobacco slurry from opposite directions simultaneously to form tobacco blocks.

[0008] Furthermore, the pressure sensing mechanism is positioned relative to the loading mechanism along the direction of tobacco bulk pressing;

[0009] The pressure sensing mechanism includes a first pressure sensor, which is disposed on the contact surface between the loading mechanism and the tobacco bulk pressing direction.

[0010] Furthermore, the loading mechanism includes a sample preparation tube, which includes an upper sample preparation core and a lower sample preparation core. The upper and lower sample preparation cores are symmetrically arranged to form a plunger structure facing each other. The pressure sensing mechanism includes a second pressure sensor, which is located at the connection between the upper and lower sample preparation cores and is positioned opposite to the first pressure sensor.

[0011] Furthermore, the first and second pressure sensors have the same model and other technical parameters, which makes it easy to maintain the consistency of the pressure obtained.

[0012] Furthermore, the diameters of the first pressure sensor are [13-15) mm, [15-20) mm, [20-30) mm, or [30-40) mm; where the symbol "[" indicates that the value is included, and the symbol ")" indicates that it is not included. This is mainly because the outer diameter of the pressure sensor cannot be the same as the inner diameter of the sample preparation tube, otherwise it will lead to installation difficulties. Therefore, the diameter of the first pressure sensor does not include 40 mm.

[0013] Furthermore, the diameters of the second pressure sensors are [13-15) mm, [15-20) mm, [20-30) mm, or [30-40) mm; where the symbol "[" indicates that the value is included, and the symbol ")" indicates that it is not included. This is mainly because the outer diameter of the pressure sensor cannot be the same as the inner diameter of the sample preparation tube, otherwise it will lead to installation difficulties. Therefore, the diameter of the second pressure sensor does not include 40 mm.

[0014] Furthermore, the distance between the first pressure sensor and the inner wall of the loading mechanism is 0.10–0.20 mm, 0.20–0.30 mm, 0.30–0.40 mm, or 0.40–0.50 mm.

[0015] Furthermore, the distance between the second pressure sensor and the inner wall of the loading mechanism is 0.10–0.20 mm, 0.20–0.30 mm, 0.30–0.40 mm, or 0.40–0.50 mm.

[0016] Furthermore, a flexible film is attached to the surface of the first pressure sensor. The diameter of the film is similar to that of the piston, and the film is not attached to the surface of the piston or cup holder. The thickness of the flexible film is 0.05-0.10 mm, 0.10-0.15 mm, or 0.15-0.20 mm.

[0017] Furthermore, a flexible film is attached to the surface of the second pressure sensor. The diameter of the film is similar to that of the piston, and the film is not attached to the surface of the piston or cup holder. The thickness of the flexible film is 0.05-0.10 mm, 0.10-0.15 mm, or 0.15-0.20 mm.

[0018] Furthermore, the first pressure sensor is embedded in the contact surface between the loading mechanism and the tobacco bulk pressing direction, and the second pressure sensor is embedded in the connection part between the upper sample core and the lower sample core, thereby forming a flat tobacco block during the pressing of the tobacco bulk.

[0019] Furthermore, the pressure testing device also includes an automatic mixing unit.

[0020] The loading mechanism is mounted on the automatic mixing unit, which drives the loading mechanism to reciprocate during the tobacco bulk pressing process.

[0021] Furthermore, the automatic mixing unit includes a mixing servo motor, an eccentric turntable, a rocker arm, and a mounting plate.

[0022] The mixing servo motor is connected to the eccentric turntable.

[0023] The eccentric turntable is connected to the mounting plate via a rocker arm.

[0024] The mounting plate connects to the loading mechanism.

[0025] The mixing servo motor drives the eccentric turntable to move, which in turn drives the loading mechanism to move up and down via the mounting plate.

[0026] Furthermore, the present invention also provides a tobacco slurry preparation system, which includes a pressure testing device. The pressure testing device includes a loading mechanism, an automatic pressing unit, a control system, and a pressure sensing mechanism. The loading mechanism contains loose tobacco material, which is used to be pressed into tobacco slurries. The automatic pressing unit is connected to the loading mechanism and is driven by the control system to press the loose tobacco material in the loading mechanism. The pressure sensing mechanism is used to measure the pressure on the loose tobacco material during the pressing process.

[0027] Furthermore, the pressure testing device can be any of the pressure testing device technical solutions mentioned above.

[0028] The present invention also provides a method for preparing a measuring tobacco block based on a desired filling density, comprising:

[0029] Step 1: Prepare the pressure testing device, which includes a loading mechanism, an automatic pressing unit, a control system, and a positioning clamping unit holding the pressure sensor. Add loose tobacco material to the pressure testing device and press it according to different fitting sample preparation control parameters to obtain different fitting tobacco blocks as experimental tobacco blocks. Record the filling density of each fitting tobacco block. The positioning clamping unit holding the pressure sensor is the aforementioned pressure sensing mechanism. Step 2: Based on the fitting sample preparation control parameters and the corresponding required filling density, determine the required sample preparation control parameters according to the required filling density. Step 3: Prepare the preparation device, which includes a loading mechanism, an automatic pressing unit, a control system, and a positioning clamping unit holding a thermophysical property measurement sensor. The thermophysical property measurement sensor can have the same shape as the pressure sensor. Press it according to the required sample preparation control parameters to obtain measurement tobacco blocks for measuring thermophysical parameters. The loading mechanism is the sample preparation mechanism.

[0030] Furthermore, the sample preparation control parameters for fitting and the required sample preparation control parameters include pressing speed, vibration necessity, vibration frequency, vibration time and / or static equilibration time after vibration.

[0031] This invention claims protection for a measuring tobacco block prepared according to the above-described method for preparing a measuring tobacco block based on a desired filling density.

[0032] The present invention also claims protection for the application of the measuring tobacco block according to the above description in the measurement of the thermophysical parameters of tobacco block.

[0033] This invention provides a pressure testing device. Before preparing samples of tobacco bulk with unknown properties, the device is used to determine the control parameters for the tobacco block preparation process. Experimental tobacco blocks are obtained by pressing the tobacco bulk with the device to clarify the sample preparation control parameters for achieving uniform density distribution of the material. These parameters include pressing speed, whether vibration is required, the frequency and duration of vibration if needed, and the settling time. Then, using the obtained sample preparation control parameters, a different actual preparation device is used to obtain tobacco blocks for measuring thermophysical parameters.

[0034] In addition, the tobacco slurry preparation system of the present invention also has the following beneficial effects:

[0035] (1) A method and means is provided to determine whether the density distribution of tobacco bulk is uniform after compression by the consistency of pressure on both sides of the tobacco bulk;

[0036] (2) A method is provided to control the piston pressing speed by feedback of the pressure change rate during the pressing process of tobacco bulk material, which effectively avoids: the generation of excessively high-density tobacco cakes that cannot be dissipated by the elasticity of the tobacco itself due to excessive local material compression, and the occurrence of uneven density distribution of the prepared tobacco block sample and sample failure.

[0037] (3) The method used is simple and efficient, the device is safe and reliable, environmentally friendly and inexpensive. Attached Figure Description

[0038] The above description of the present invention 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 solutions.

[0039] Figure 1-1 This is a schematic diagram of a pressure testing device;

[0040] Figure 1-2 This is a 3D structural diagram of the pressure testing device;

[0041] Figure 1-3 This is a cross-sectional view of the loading mechanism in the pressure testing device;

[0042] Figure 1-4A yes Figure 1-3 Enlarged view of point A in the middle;

[0043] Figure 1-4B yes Figure 1-3 Enlarged view of point B in the middle;

[0044] Figure 1-4C yes Figure 1-3 Enlarged view of point C in the middle;

[0045] Figure 1-5This is a schematic diagram of a pressure sensor in a pressure testing device;

[0046] Figure 1-6A This is a cross-sectional view of the tobacco bulk material before it is compressed by the pressure testing device;

[0047] Figure 1-6B This is a cross-sectional view of the tobacco bulk material being compressed into experimental tobacco blocks using a pressure testing device.

[0048] Figure 1-7A This is a pressure change curve during the sample preparation process of compressed tobacco powder, compared to Example 1.

[0049] Figure 1-7B This is a graph showing the endpoint measurements of each pressure sensor in Comparative Example 1;

[0050] Figure 1-8A This is a pressure change curve during the sample preparation process of compressed tobacco powder, compared to Example 2.

[0051] Figure 1-8B This is a graph showing the endpoint measurements of each pressure sensor in Comparative Example 2;

[0052] Figure 1-9A This is a pressure change curve during the sample preparation process of compressed tobacco powder in Example 1;

[0053] Figure 1-9B This is a graph showing the endpoint measurements of each pressure sensor in Example 1;

[0054] Figure 2-1 This is a schematic diagram of the overall structure of the tobacco slurry preparation device;

[0055] Figure 2-2A This is a schematic diagram of the sample preparation mechanism;

[0056] Figure 2-2B This is a schematic diagram of the cross-section of the sample preparation mechanism;

[0057] Figure 2-2C This is a schematic diagram of the sample preparation mechanism for preparing tobacco blocks;

[0058] Figure 2-3 This is a schematic diagram of the automatic pressing unit structure;

[0059] Figure 2-4 This is a schematic diagram of the automatic mixing unit.

[0060] Figure 2-5 This is a schematic diagram of an eccentric turntable;

[0061] Figure 2-6 This is a schematic diagram of the thin-film positioning and clamping unit structure;

[0062] Figure 2-6A This is an exploded view of the thin-film positioning and clamping unit;

[0063] Figure 2-6B This is a schematic diagram of the compression state of the pneumatic unit;

[0064] Figure 2-6C This is a schematic diagram of the first moving state of the pneumatic unit;

[0065] Figure 2-6D This is a schematic diagram of the second moving state of the pneumatic unit;

[0066] Figure 2-6E This is a schematic diagram of the protective panel structure;

[0067] Figure 2-6F This is a schematic diagram of the upper sample core protective plate structure;

[0068] Figure 2-6G This is a schematic diagram of the structure of the measuring film protective plate;

[0069] Figure 2-6H This is a schematic diagram of the protective plate structure for the sample core;

[0070] Figure 2-7 This is a schematic diagram of the cylinder unit structure;

[0071] Figure 2-8A This is a schematic diagram of the upper bucket lid structure;

[0072] Figure 2-8B This is a schematic diagram of the lower bucket lid structure;

[0073] Figure 2-9A This is a schematic diagram showing the assembly of the components of the sealing mechanism at the top of the bucket lid;

[0074] Figure 2-9B This is a schematic diagram showing the assembly of the components of the sealing mechanism at the bottom of the bucket lid;

[0075] Figure 2-10A This is a schematic diagram of the sealing structure of the sealing mechanism at the top of the bucket lid;

[0076] Figure 2-10B This is a schematic diagram of the sealing structure of the sealing mechanism at the bottom of the bucket lid;

[0077] Figure 2-11 This is a schematic diagram of the connecting component structure;

[0078] Figure 2-12 This is a schematic diagram of the intermediate state of the sample preparation mechanism and the thin film positioning and clamping unit during the removal process;

[0079] Figure 2-13 This is a schematic diagram showing the sample preparation mechanism and the thin film positioning and clamping unit in the removed state;

[0080] Figure 2-14 This is a schematic diagram of the operation of the knob handle of the sample preparation mechanism;

[0081] Figure 2-15Ayes Figure 2-14 Cross-sectional view of the sample preparation mechanism and the thin film positioning and clamping unit;

[0082] Figure 2-15B yes Figure 2-14 Side view of the sample preparation mechanism and the thin film positioning and clamping unit;

[0083] Figure 2-16 This is a diagram showing the knob handle being moved out;

[0084] Figure 2-17A yes Figure 2-16 Cross-sectional view;

[0085] Figure 2-17B yes Figure 2-16 Side view;

[0086] Figure 2-18 This is a diagram illustrating the replacement of the sample tube;

[0087] Figure 2-19 This is a schematic diagram showing the separation of the upper and lower sample cores during the material replacement process;

[0088] Figure 2-20A This is a schematic diagram of the first state of assembly of the upper and lower sample cores during the material replacement process;

[0089] Figure 2-20B This is a cross-sectional view of the first state of the upper and lower sample cores during the material loading and replacement process.

[0090] Figure 2-21A This is a schematic diagram of the second state of assembly of the upper and lower sample cores during the material replacement process;

[0091] Figure 2-21B This is a cross-sectional view of the second state of the upper and lower sample cores during the material replacement process;

[0092] Figure 2-22A This is a schematic diagram of the third state of assembly of the upper and lower sample cores during the material replacement process;

[0093] Figure 2-22B This is a cross-sectional view of the third state of the upper and lower sample cores during the material replacement process.

[0094] Figure 2-23 This is a schematic diagram showing the completed assembly of the upper and lower sample cores;

[0095] Figure 2-24 This is a cross-sectional view of the knob handle reinstallation position;

[0096] Figure 2-25 This is a schematic diagram of the intermediate state of the sample preparation mechanism and the thin film positioning and clamping unit during the flipping process;

[0097] Figure 2-26This is a schematic diagram showing the end of the flipping state of the sample preparation mechanism and the thin film positioning and clamping unit;

[0098] Figure 2-27 This is a schematic diagram of the intermediate state of the sample preparation mechanism and the thin film positioning and clamping unit during the retraction process;

[0099] Figure 2-28 This is a schematic diagram showing the sample preparation mechanism and the film positioning and clamping unit moving back to their original positions.

[0100] The reference numerals in the attached figures are explained as follows:

[0101] Sample preparation institution: 1

[0102] Piston rod: 1.1, 1.1'

[0103] Sample tubes: 1.2, 1.2'

[0104] Sample cores: 1.21, 1.21'

[0105] Sample cores to be prepared: 1.22, 1.22'

[0106] Knob handle: 1.3

[0107] Fixing nut component: 1.31

[0108] Sample cup support: 1.4″, 1.4″

[0109] Slot size: 1.41

[0110] Pistons: 1.5" and 1.5"

[0111] Automatic pressing unit: 2, 2″

[0112] Pressing servo motor: 2.1

[0113] Synchronous belt drive assembly: 2.2

[0114] High-precision lead screw assembly: 2.3

[0115] Pressure head mounting block: 2.4

[0116] Guiding module: 2.5

[0117] Detection switch: 2.6

[0118] Automatic mixing unit: 3, 3″

[0119] Mixing servo motor: 3.1

[0120] Gear reducer: 3.2

[0121] Motor mounting bracket: 3.3

[0122] Coupling: 3.4

[0123] Rotation axis: 3.5

[0124] Zero-position induction ring: 3.6

[0125] Eccentric turntable: 3.7

[0126] Rocker arm: 3.8

[0127] Resale: 3.9

[0128] Mounting plate: 3.10

[0129] Sensor: 3.11

[0130] Thin film positioning and clamping unit: 4

[0131] Protective panel: 4.1

[0132] Upper sample core protective plate: 4.11

[0133] Measuring the thin-film protective plate: 4.12

[0134] Hollow groove: 4.121

[0135] Lower sample core protective plate: 4.13

[0136] Slit: 4.14

[0137] Protective tray: 4.2

[0138] Film upper pressure plate: 4.3

[0139] Film underplate: 4.4

[0140] Thin-film positioning knob handle: 4.5 Thin-film positioning knob fastener: 4.51 Hotdisk thermophysical property measurement sensor: 4.6 Thermophysical property measurement thin film: 4.7

[0141] Pneumatic units: 5

[0142] Cylinder: 5.1

[0143] Cylinder mounting plate: 5.2

[0144] Cylinder puller: 5.3

[0145] Control system: 6

[0146] Front panel: 7

[0147] Closed structure: 8

[0148] Top lid: 8.1

[0149] Upper screw positioning slot: 8.11

[0150] Upper nut positioning groove: 8.12

[0151] Upper lid screws: 8.2

[0152] Upper bucket lid nut: 8.3

[0153] Lower bucket lid: 8.4

[0154] Lower screw positioning slot: 8.41

[0155] Lower nut positioning groove: 8.42

[0156] Bottom lid screws: 8.5

[0157] Bottom lid nut: 8.6

[0158] Connection components: 9

[0159] Fastener: 9.1

[0160] Locking handle: 9.2

[0161] Loading mechanism: 10

[0162] Pressure sensor A: 10.1

[0163] B. Pressure sensor: 10.2

[0164] C. Pressure sensor: 10.3

[0165] D pressure sensor: 10.4

[0166] P1 signal line: 11.1

[0167] P2 signal line: 11.2

[0168] P3 signal line: 11.3 Detailed Implementation

[0169] The following detailed description of the features and advantages of the present invention is sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly. Furthermore, based on the specification, claims and drawings disclosed herein, those skilled in the art can easily understand the related objects and advantages of the present invention.

[0170] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0171] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0172] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0173] This invention is based on the needs of heated cigarette product design and related scientific research. Those skilled in the art hope to accurately grasp the range and law of changes in the thermophysical parameters of tobacco in the filling state of the cigarette. Due to the influence of many factors such as tobacco material type, formula, form (filament, granular, flake, etc.), chemical composition content, etc., the volume of natural accumulation per unit weight of different tobacco materials varies greatly, and the elastic modulus (characterized by "filling degree" in this field) also varies. Therefore, in combination with the structure and performance characteristics of the thermophysical measurement probe, the following requirements must be met when testing the thermophysical properties of tobacco materials: (1) In cigarette design and actual production, the filling density of different types and properties of tobacco materials often has its own suitable design range and process fluctuation. When conducting thermophysical property research, it is necessary to simulate the filling density of tobacco materials in the cigarette and to expand the range to accurately measure the filling density. Tobacco blocks with different filling densities and uniform distribution are prepared to study the trend and law of thermophysical property changes; (2) Transient planar heat source method (TPS) is a commonly used method for measuring the thermophysical parameters of tobacco blocks. The commonly used commercial instruments use a soft planar circular thin sheet (hereinafter referred to as "probe") made of thermally resistive material with a continuous double helix structure and covered with a double layer of polyimide (Kapton) protective layer. The probe diameter is generally above 12.8 mm. When measuring, in order to obtain accurate and stable measurement results, the probe must be placed flat in the middle of the block, the radial dimension of the block is not less than twice the probe diameter, the axial stacking thickness is not less than the probe radius, and both sides of the probe must be flush with the sample. (2) The sample has good and stable contact, the density distribution of the material block is uniform, and it is stably balanced to the set target temperature; (3) Since the probe is soft, it cannot be inserted into the material block after the material block is pressed and formed in a way that ensures that it is flat and does not change the shape and density of the material block. Therefore, the probe needs to be pre-embedded in the material before pressing, and the probe must be ensured not to bend or deform during the pressing process to affect the measurement performance or even be damaged; (4) The moisture content of tobacco material is easy to change, which will cause the essential properties of the sample to change and lead to the distortion of the measurement results. The sample preparation, sample temperature balance and measurement process inevitably require a long time (>30 min). Therefore, the sample should be kept in a sealed environment as much as possible throughout the process. In the device system; (5) The pressing process requires a large force, so the device for pressing and loading materials must be made of metal; (6) Since the uniformity of the density distribution inside the tobacco block greatly affects the accuracy and precision of the thermophysical parameters of the block material, and thus affects whether the heat transfer performance of the material system can be truly and reliably reflected, it is necessary to observe whether the density distribution of the block is uniform during the pressing of the block sample in the closed system and after the pressing is completed. Traditional methods are difficult to apply, costly and have certain requirements or impacts on the environment. For example, X-ray imaging, CT scan, nuclear magnetic resonance, and ultrasonic imaging are not suitable for systems wrapped in metal.

[0174] Traditional apparatus and methods for preparing bulk samples: A cylindrical metal cup with a sealed bottom, an open top, and a 180° slit in the middle is used as a sample preparation tool. Half of a certain mass of material is first put into the cup and pre-pressed to the thickness below the slit with the press block. Then, a probe is inserted from the slit to the top of the pre-pressed block. Then, the other half of the material is put in for a second pressing. The overall height of the block is controlled to achieve the overall target volume and filling density. The main technical defects of this sample preparation device and method are: (1) The entire pressing process is manually operated, and it is difficult to accurately control the volume and packing density of the compressed material, the uniformity of the internal density distribution, and the consistency of parallel samples; (2) In order to avoid the probe bending caused by the rebound displacement of the pre-pressed material before secondary feeding, a large gap is often left between the slit and the thin-film probe. Therefore, during pressing, the material is easy to leak from the gap, resulting in inaccurate quantitative measurement of the material; (3) Since the pressing direction is unidirectional and the material at the top and bottom of the probe is pressed twice, when it is necessary to prepare samples with low filling density, especially for samples with their own... (3) Samples with a certain viscosity will generate different frictional resistance between the material and the side wall of the cup during the pressing process. As a result, the internal density distribution of the sample along the pressing direction is prone to different degrees of difference; (4) The force of manually pressing the sample is insufficient, making it difficult to make high-density samples; (5) Since tobacco material is an irregularly shaped bulk material, if the thin film probe is placed directly in the material and then pressed, the force will be uneven during the process, which will easily cause deformation, affecting the measurement results or even damage; (6) The gaps at the top and middle of the sample cup are large and connected to the ambient atmosphere, which makes the moisture content of the sample easy to change, causing the heat transfer performance of the prepared material block to change.

[0175] Therefore, the inventors have innovatively proposed a tobacco block preparation system. In the process of preparing experimental tobacco blocks through a pressure testing device, optimized sample preparation parameters are obtained to obtain tobacco blocks with uniform material density distribution. Thus, the loading mechanism 10 is replaced by the sample preparation mechanism 1 to prepare tobacco blocks for testing thermophysical parameters such as thermal conductivity, thermal diffusivity, and volumetric specific heat.

[0176] Example A

[0177] like Figure 1-1 and 1-2 As shown, the present invention provides a pressure testing device for a tobacco slurry preparation system. The pressure testing device includes a loading mechanism 10, an automatic pressing unit 2″, a control system, and a pressure sensing mechanism. The loading mechanism 10 contains loose tobacco material, which is used to be pressed to form experimental tobacco slurries. The automatic pressing unit 2″ is connected to the loading mechanism 10 and is driven by the control system to press the loose tobacco material in the loading mechanism 10. The pressure sensing mechanism is used to measure the pressure on the loose tobacco material during the pressing process.

[0178] Specifically, such as Figure 1-3 As shown in Figures 1-4, the loading mechanism 10 has a structure basically the same as the sample preparation mechanism 1. The sample preparation tube includes an upper sample preparation core and a lower sample preparation core, which are symmetrically arranged to form a piston structure facing each other. The difference between the loading mechanism 10 and the sample preparation mechanism 1 is that the loading mechanism 10 also includes a pressure sensing mechanism. The pressure sensing mechanism includes a first pressure sensor and a second pressure sensor, with the first pressure sensor mounted on the piston 1.5″ of the loading mechanism 10. Preferably, as shown in Figure 1-4... Figure 1-4A and 1-4C As shown, the first pressure sensor includes pressure sensor A 10.1 and pressure sensor D 10.4. Figure 1-4B As shown, the second pressure sensor includes pressure sensor B 10.2 and pressure sensor C 10.3, located at the junction of the upper and lower sample cores, and is positioned opposite to the first pressure sensor. The automatic pressing unit 2″ drives the tobacco slurry in the loading mechanism 10 to move relative to each other at both ends along the pressing direction, thereby simultaneously pressing the tobacco slurry from opposite directions to form an experimental tobacco block. Specifically, signal line P1 11.1 is connected to pressure sensor A 10.1, signal line P2 11.2 is connected to pressure sensors B 10.2 and C 10.3, and signal line P3 11.3 is connected to pressure sensor D 10.4.

[0179] More specifically, the sample preparation mechanism 1 may be equipped with a U-shaped rigid support protective component around the Hotdisk thermophysical property measurement sensor 4.6, which serves as a thermophysical property probe. Its main function is to protect the thermophysical property probe from damage during sample pressing and to remove it from the sample preparation unit after pressing, ensuring good contact between the thermophysical property probe and the tobacco blocks on both sides for thermophysical property parameter detection. However, the rigid support protective component and protective plate 4.1 cannot be installed in the loading mechanism 10 to prevent errors in the pressure detection results. Furthermore, since the pressure sensor has a certain thickness, and the sample cup holder 1.4″ itself must be able to withstand the pressure transmitted from the material on either side without transmitting the pressure to the pressure sensor on the other side, ensuring that the values ​​measured by the pressure sensors on both sides of the cup holder only come from the material sample on their own side, the thickness of the sample cup holder 1.4″ equipped with pressure sensors B and C is not less than twice the thickness of a single pressure sensor.

[0180] Specifically, such as Figure 1-5As shown, the diameter of the pressure sensing mechanism (pressure-bearing surface) is smaller than the inner diameter of the sample tube cylinder and larger than the diameter of the thermophysical property measuring sensor 4.6. Preferably, the diameter of the pressure sensor is 12.8mm ≤ φd < 40mm, more preferably 15mm ≤ φd < 30mm, and even more preferably 15mm ≤ φd < 20mm. More specifically, to avoid the pressure sensor being affected by the frictional force of the external structure, the first and second pressure sensors are provided with a certain distance from the inner wall of the loading mechanism 10, that is, a gap of 0.1 to 0.5mm is left between the outer periphery of the pressure sensor and the mounting hole of the piston 1.5″ or the sample cup support 1.4″.

[0181] Specifically, to prevent material debris from falling into the gap, a flexible film with a certain stiffness, approximately the same diameter as the piston 1.5″, is adhered to the surface of the pressure sensor. The film thickness is 0.05–0.20 mm, preferably 0.10–0.15 mm, and more preferably 0.15 mm. The film is not adhered to the surface of the piston or the sample cup support 1.4″ to avoid tensile stress between the piston 1.5″ (or sample cup support 1.4″) and the pressure sensor when under pressure.

[0182] Specifically, the first pressure sensor is embedded in the contact surface between the loading mechanism 10 and the tobacco bulk pressing direction, and the second pressure sensor is embedded in the connection between the upper and lower sample cores, thereby forming a flat tobacco block during the pressing process. To ensure the consistency of the pressed tobacco block volume, when installing the pressure sensing mechanism, it is necessary to ensure that the measuring area surfaces of pressure sensor A 10.1 and pressure sensor D 10.4 are flush with the end faces of the upper and lower pistons 1.5″, respectively, and the measuring area surfaces of pressure sensor B 10.2 and pressure sensor C 10.3 are flush with the upper and lower surfaces of the sample cup support 1.4″, respectively.

[0183] Specifically, the pressure testing device also includes an automatic mixing unit 3″, and a loading mechanism 10 is mounted and fixed on the automatic mixing unit 3″. The automatic mixing unit 3″ is used to drive the loading mechanism 10 to reciprocate during the tobacco bulk pressing process.

[0184] The principle and main process of the pressure testing device for controlling the pressing of uniform tobacco blocks are as follows:

[0185] Prepare a pressure testing device, which includes a loading mechanism, an automatic pressing unit, a control system, and a positioning clamping unit (i.e., a pressure sensing mechanism) that holds pressure sensors. Before adding tobacco and other materials to the loading mechanism 10 and installing the loading mechanism 10 onto the automatic pressing unit 2″ to start pressing, the control system resets each pressure sensor to zero.

[0186] like Figure 1-6AAs shown, experimental tobacco blocks for fitting were prepared by pressing materials with pistons in opposite directions according to different sample preparation control parameters. The filling density of each tobacco block was recorded, the pressure of each sensor was continuously monitored, and the piston pressing speed was controlled by the feedback of the pressure change rate to avoid producing excessively high-density tobacco cakes that could not be dissipated by the elasticity of the tobacco itself due to excessive local material compression.

[0187] like Figure 1-6B As shown, after the pressing action is completed and the system is allowed to stand still for a period of time to allow the pressure measurement results from each sensor to stabilize, the results are read and the consistency of the pressure measurement results from each sensor is examined to see if it is within the target control range. The data results are then fed back to the control system. Based on the fitted sample preparation control parameters and the corresponding required filling density, the required sample preparation control parameters are determined according to the required filling density. This determines whether to further vibrate and allow the system to stand still for a certain frequency and duration to achieve a basically consistent pressure. Based on this, it is judged that the uniformity of the tobacco block density distribution meets the target requirements, and the sample preparation control parameters are retained. Then, referring to... Figures 2-12 to 2-28 The process involves replacing the loading mechanism 10 with the sample preparation mechanism 1, and then preparing uniform tobacco blocks for thermophysical parameter testing according to the corresponding sample preparation control parameters.

[0188] Comparative Example 1

[0189] Use size specifications such as Figure 1-5 The pressure sensor shown has a range of 100N, as described in Example A. Figure 1-1 and Figure 1-2 Assemble and fabricate a pressure testing device. For comparison, feedback optimization control was not initially set for the compression program, resulting in vibration-free compression. A set of devices with a lower packing density of 0.4 g / cm³ was prepared. 3 Experimental tobacco shavings samples were prepared by weighing two equal masses of rolled thin sheets and feeding them into the feed cylinder. The sample preparation unit was installed, and a constant pressing speed of 1 mm / s was set, with a single-sided thickness of 20 mm at the pressing endpoint and a set resting time of 120 s. Pressure change data from pressure sensors A (10.1), B (10.2), C (10.3), and D (10.4), as well as the pressure data at the end of the resting time, were recorded. The pressure change curve during the tobacco shavings pressing process is shown below. Figure 1-7A As shown in Table 1, the pressure test results after pressing into tobacco blocks are as follows: Figure 1-7B As shown.

[0190] Table 1: Data from various pressure sensors after tobacco bulk material is compressed into tobacco blocks

[0191] A pressure sensor B Pressure Sensor C pressure sensor D pressure sensor Pressure value / g 70 60 60 40

[0192] The results of the sample preparation process and the final pressure show that, without the feedback optimization control of the pressing program, although the pressing speed is slow, there is a large difference in the pressure on the upper and lower surfaces of the sample in the upper and lower sample cores, with a range of 40g, which means that there is a difference in the density distribution of the prepared sample blocks.

[0193] Comparative Example 2

[0194] Use size specifications such as Figure 1-5 The pressure sensor shown has a range of 100N, as described in Example A. Figure 1-1 and Figure 1-2 Assemble and fabricate a pressure testing device. For comparison, feedback optimization control for the pressing procedure is still not set, and there is no vibration during the pressing process. Prepare a set with a higher filling density of 0.6 g / cm³. 3 Experimental tobacco shavings samples were prepared by weighing two equal masses of rolled thin sheets and feeding them into the feed cylinder. The sample preparation unit was installed, and a constant pressing speed of 1 mm / s was set, with a single-sided thickness of 20 mm at the pressing endpoint and a set resting time of 120 s. Pressure change data from pressure sensors A (10.1), B (10.2), C (10.3), and D (10.4), as well as the pressure data at the end of the resting time, were recorded. The pressure change curve during the tobacco shavings pressing process is shown below. Figure 1-8A As shown in Table 2, the pressure test results after pressing into tobacco blocks are as follows: Figure 1-8B As shown.

[0195] Table 2: Data from various pressure sensors after tobacco bulk material is compressed into tobacco blocks

[0196] A pressure sensor B Pressure Sensor C pressure sensor D pressure sensor Pressure value / g 320 350 320 350

[0197] The results of the sample preparation process and the final pressure show that, without the feedback optimization control of the pressing program, the pressure difference between the upper and lower surfaces of the material block decreased but still existed due to the increase in the sample pressing density. The range was still 30g, which means that the density distribution of the prepared sample block was still different.

[0198] Example 1

[0199] Use size specifications such as Figure 1-5 The pressure sensor shown has a range of 100N, as described in Example A. Figure 1-1 and Figure 1-2 Assemble and fabricate a pressure testing device. Optimize the compression process by setting the vibration time to 60 seconds and the vibration frequency to 7 Hz during compression. Prepare a set of materials with a suitable filling density of 0.5 g / cm³. 3Experimental tobacco block samples were used. Other conditions were the same as in Comparative Examples 1 and 2. Pressure change data from pressure sensors A (10.1), B (10.2), C (10.3), and D (10.4), as well as pressure data at the end of the waiting time, were recorded. The pressure change curves during the tobacco block compression process are shown below. Figure 1-9A As shown in Table 3, the pressure test results after pressing into tobacco blocks are as follows: Figure 1-9B As shown.

[0200] Table 3: Data from various pressure sensors after tobacco bulk material is compressed into tobacco blocks

[0201] A pressure sensor B Pressure Sensor C pressure sensor D pressure sensor Pressure value / g 120 120 130 130

[0202] The results from the sample preparation process and the final pressure show that after initial optimization and control of the pressing procedure, and setting a certain duration and frequency of vibration, the pressure difference between the upper and lower surfaces of the material blocks was effectively controlled, and the pressure on the upper and lower surfaces of the two material blocks tended to be consistent. The pressure difference between the material blocks in the upper and lower sample cores was less than 30g, and the pressure difference was further reduced to 10g. The reason for the pressure difference between the two material blocks may be related to the slight difference in the actual weight of the material weighed into each cylinder.

[0203] Examples 1 and Comparative Examples 1 and 2 demonstrate that by monitoring the pressure difference across the tobacco block and then implementing measures such as providing vibration during the pressing process, the beneficial technical effect of pressing tobacco blocks with uniform density distribution can be achieved. However, for samples with various properties, and when different densities need to be pressed, the applicable pressing parameters may differ. The pressure testing device of this invention can be used for optimal selection.

[0204] Example B

[0205] like Figures 2-1 to 2-28 The illustrated embodiment of the tobacco slurry preparation apparatus of the present invention includes a loading mechanism, an automatic pressing unit, a control system, and a positioning clamping unit for holding a thermophysical property measurement sensor. The apparatus is used to press new loose tobacco material according to the sample preparation control parameters obtained in Example A to obtain a measuring tobacco slurry. This measuring tobacco slurry is equipped with a thermophysical property measurement sensor for measuring thermophysical parameters. The loading mechanism is a sample preparation mechanism 1, and the positioning clamping unit for holding the thermophysical property measurement sensor is a thin-film positioning clamping unit 4.

[0206] Specifically, the tobacco block preparation device mainly includes: a sample preparation mechanism 1, an automatic pressing unit 2, an automatic mixing unit 3, a film positioning and clamping unit 4, a pneumatic unit 5, a control system 6, a front panel 7, a sealing mechanism 8, and a connecting component 9.

[0207] like Figure 2-1As shown, the sample preparation mechanism 1 is mounted and fixed to the automatic mixing unit 3 via a stop and a knob handle 1.3. The entire unit can be easily interchanged for preparing multiple samples. The main body is a pair of opposing plunger structures, which can be easily disassembled for material loading and replacement. The circular inner cross-section helps maintain consistent radial stress during the pressing process. The smooth inner wall reduces frictional resistance between the sample and the tube wall during pressing, as well as the impact of resistance transmission into the block on the uniformity of the block density distribution. Rigid materials such as aluminum alloy and stainless steel are used, making the unit robust, pressure-resistant, dimensionally stable, easy to clean, and possessing good heat transfer properties to facilitate rapid temperature equilibrium. The upper and lower ends of the sample preparation mechanism 1 are sealed by a closing mechanism 8 to keep the material inside the mechanism in preparation for pressing.

[0208] The automatic pressing unit 2 is installed at the front end of the front panel 7, located above and below the sample preparation mechanism 1. It achieves fully automatic pressing of tobacco blocks by driving the pressing head to squeeze the piston 1.5 of the sample preparation module through the pressing servo motor 2.1 and the high-precision linear slide.

[0209] The automatic mixing unit 3 is installed and fixed at the rear end of the front panel 7. The automatic pressing unit 2 is driven by the mixing servo motor 3.1 to reciprocate in the up and down direction, which promotes the mixing of tobacco smoke body as tobacco bulk material and the equalization of internal stress. The vibration speed, frequency and interval can be set individually and in combination to ensure that the material block obtained after pressing is evenly distributed.

[0210] The thin-film positioning and clamping unit 4 is mounted on the sample preparation mechanism 1. The protective plate 4.1 prevents the Hotdisk thermophysical property measurement probe (i.e., the thermophysical property measurement thin film 4.7) from being excessively deformed under pressure during the material block preparation process, and has a structural design and protective design to prevent deformation of the thermophysical property measurement sensor. The pneumatic unit 5 is mounted on the automatic pressing unit 2 and is located behind the sample preparation mechanism 1. During the tobacco block pressing process, it can automatically pull the protective plate 4.2 backward so that the upper and lower tobacco blocks can tightly clamp the thermophysical property measurement sensor.

[0211] The connecting assembly 9 is connected to the closing mechanism 8 to fix the sample preparation mechanism 1 in the front panel 7 in an axial position, and can also maintain a stable connection of the opposing plunger structures of the sample preparation mechanism 1.

[0212] <Sample Preparation Organization>

[0213] The sample preparation mechanism 1 is used to hold tobacco sample blocks. It includes a sample preparation tube 1.2, which comprises an upper sample preparation core 1.21 and a lower sample preparation core 1.22. The sample preparation tube 1.2 is fixed to the sample cup support 1.4 via a knob handle 1.3. Both the upper sample preparation core 1.21 and the lower sample preparation core 1.22 are equipped with a piston rod 1.1 and a piston 1.5, respectively. In some operating states, the piston rod 1.1 is extended. The upper sample preparation core 1.21 and the lower sample preparation core 1.22 are symmetrically arranged to form a opposing plunger structure. Loose tobacco material is contained in the upper sample preparation core 1.21 and the lower sample preparation core 1.22, respectively. An automatic pressing unit 2 is symmetrically positioned at the upper sample preparation core 1.21 and the lower sample preparation core 1.22, thereby pressing the loose tobacco material in the upper sample preparation core 1.21 and the lower sample preparation core 1.22 in opposite directions. When the automatic pressing unit 2 is pressing, the Hotdisk thermophysical property measurement sensor 4.6 is located outside the sample preparation tube 1.2, and the thermophysical property measurement film 4.7 is located between the upper sample preparation core 1.21 and the lower sample preparation core 1.22, and is attached to the protective plate 4.1 to prevent excessive deformation under pressure during the pressing process. After the automatic pressing unit 2 has finished pressing, the tobacco material in the upper sample preparation core 1.21 and the lower sample preparation core 1.22 is pressed into upper tobacco material blocks and lower tobacco material blocks, respectively. The pneumatic unit 5 pulls out the protective plate 4.1, and the upper and lower tobacco material blocks automatically expand, thereby tightly wrapping the thermophysical property measurement film 4.7 in the upper and lower tobacco material blocks to form tobacco material blocks.

[0214] like Figure 2-2A , Figure 2-2B and Figure 2-2C As shown, piston 1.5 and piston rod 1.1 are installed together in the inner hole of sample preparation tube 1.2 to form a cavity for accommodating tobacco shreds, tobacco powder, and sheet tobacco of different types, formulas, and containing different additives as tobacco bulk material. The tobacco bulk material is pressed into tobacco blocks by automatic pressing unit 2 inside sample preparation tube 1.2. Sample preparation tube 1.2 is fixed to sample cup support 1.4 by its outer wall. The stop of sample cup support 1.4 is designed with a slot 1.41 and a barb. The slot 1.41 facilitates connection with sample preparation tube 1.2 by knob handle 1.3, and the barb facilitates connection with buckle 9.1 of connecting component 9 to fix it to front panel 7.

[0215] <Automatic compression unit>

[0216] The automatic pressing unit 2 is installed and fixed at the front end of the front panel 7, located above and below the sample preparation mechanism 1. It mainly includes: a pressing servo motor 2.1, a synchronous belt drive assembly 2.2, a high-precision lead screw assembly 2.3, a pressing head mounting block 2.4, a guide module 2.5, and a detection switch 2.6, etc.

[0217] like Figure 2-3As shown, the pressing servo motor 2.1 is mounted on the front panel 7, and is connected to the high-precision lead screw assembly 2.3 via a synchronous belt drive assembly 2.2. The pressing head mounting block 2.4 is mounted on the lead screw nut of the high-precision lead screw assembly 2.3. The guide module 2.5 is used for guiding the lead screw. The detection switch 2.6 is used to detect the initial position of the high-precision lead screw assembly 2.3 for the control system 6 to determine its operation, thereby setting and adjusting the pressing parameters.

[0218] When the pressing servo motor 2.1 drives the synchronous belt drive assembly 2.2 to rotate, it in turn drives the high-precision lead screw assembly 2.3 to move, thereby causing the press head mounting block 2.4 to compress the piston rod 1.1 and piston 1.2 of the sample preparation mechanism 1 to achieve fully automatic pressing of tobacco bulk material into tobacco blocks. Because the synchronous belt drive assembly 2.2 transmits the pressing power, a soft connection is formed between the fixed pressing servo motor 2.1 and the high-precision lead screw assembly 2.3, which vibrates with the mounting plate 3.10. This avoids vibration of the pressing servo motor 2.1, which is the driving unit, and improves the safety and service life of the device. The sample preparation action can be set by the operator through the operating program of the control system 6. Specific parameters include: the ability to select and set single-stage pressing or multi-stage pressing; the ability to set the step distance and pressing speed for each single pressing; and the ability to set the pause time between any two steps. The pressing thickness adjustment accuracy is not less than 0.1mm, and the error is ≤0.1mm.

[0219] Automatic mixing unit

[0220] The automatic mixing unit 3 is installed on the front panel 7, and the sample preparation mechanism 1 is installed and fixed on the automatic mixing unit 3. The sample preparation mechanism 1 is driven by a servo motor to reciprocate in the up and down direction, so that the tobacco powder contained in the sample preparation module is evenly distributed, and the tobacco powder block obtained after pressing is evenly distributed. It mainly includes: mixing servo motor 3.1, reducer 3.2, motor mounting base 3.3, coupling 3.4, rotating shaft 3.5, zero position sensing ring 3.6, eccentric turntable 3.7, rocker arm 3.8, pivot pin 3.9, mounting plate 3.10 and sensor 3.11, etc.

[0221] like Figures 2-4 to 2-5As shown, the mixing servo motor 3.1 and reducer 3.2 are mounted on the front panel 7 via motor mounting base 3.3, and then connected to the rotating shaft 3.5 via coupling 3.4. The rotating shaft 3.5 is equipped with a zero-position sensing ring 3.6 and an eccentric turntable 3.7. The eccentric turntable 3.7 is connected to the mounting plate 3.10 via a pivot pin 3.9 and a rocker arm 3.8. The eccentric turntable 3.7 has three mounting positions, each corresponding to a different eccentricity, used to adjust the amplitude. A sensor 3.11 is mounted below the zero-position sensing ring 3.6 to detect the origin of rotation. The mixing servo motor 3.1 rotates under the control system 6's program, driving the eccentric turntable 3.7 on the rotating shaft 3.5, which in turn moves the mounting plate 3.10 vertically. This achieves simultaneous vibration, mixing, and uniform distribution of the tobacco blocks contained in the sample preparation mechanism 1 connected to the mounting plate 3.10. Furthermore, the vibration speed can be changed by mounting the eccentric turntable 3.7 at different positions.

[0222] <Thin Film Positioning and Clamping Unit>

[0223] The thin film positioning and clamping unit 4 is mounted on the sample preparation mechanism 1. The thin film positioning and clamping unit 4 passes through the sample preparation mechanism 1 to connect to the thermophysical property measurement sensor. It prevents excessive deformation of the thin film of the thermophysical property measurement sensor during the material block preparation process. It has a structural design to prevent film deformation and a protective design, mainly including: a protective plate 4.1, a protective support plate 4.2, an upper thin film pressure plate 4.3, a lower thin film pressure plate 4.4, a thin film positioning knob handle 4.5, a thermophysical property measurement thin film 4.7, and a Hotdisk thermophysical property measurement sensor 4.6. Among them, the thermophysical property measurement thin film 4.7 and the Hotdisk thermophysical property measurement sensor 4.6 constitute a complete thermophysical property measurement sensor mechanism.

[0224] like Figure 2-6 and Figure 2-6AAs shown, the protective plate 4.1 is installed in the middle of the sample cup support 1.4 of the sample preparation mechanism 1, and the protective support plate 4.2 is connected to the protective plate 4.1 behind the sample cup support 1.4 of the sample preparation mechanism 1. Before the tobacco bulk material is pressed into tobacco blocks, a φ12.8mm×d2.5um flexible thermophysical property measuring film 4.7 can be pre-embedded radially. The protective plate 4.1 ensures that the thermophysical property measuring film 4.7 is located at the geometric center of the tobacco block, and its eccentricity can be easily controlled to be less than 2mm. The thermophysical property measuring film 4.7 is externally connected to a cable that connects to the machine host. The thin-film positioning structure includes a thin-film positioning knob handle 4.5 and a thin-film positioning knob fastener 4.51. The thin-film positioning knob fasteners 4.51, located at both ends of the Hotdisk thermophysical property measurement sensor 4.6, connect to the upper pressure plate 4.3. The thin-film positioning knob fasteners can be in the form of pins or bolts, used to limit the left and right directions of the Hotdisk thermophysical property measurement sensor 4.6, pressing and fixing the Hotdisk thermophysical property measurement sensor 4.6 to the upper surface of the sample cup lower support 1.4. Under the action of the film positioning knob handle 4.5, the pressure plate 4.4 automatically clamps the Hotdisk thermophysical property measurement sensor 4.6, that is, the lower film pressure plate 4.4 is fixed to the lower surface of the sample cup support 1.4, thereby fixing the thermophysical property measurement sensor between the upper and lower film pressure plates. The film positioning knob handle is used to limit the vertical movement of the Hotdisk thermophysical property measurement sensor 4.6, ensuring that the Hotdisk thermophysical property measurement sensor 4.6 will not move during the movement and pressing of the sample preparation mechanism 1. For example, Figures 2-6E to 2-6H As shown, the protective plate 4.1 includes an upper sample core protective plate 4.11, a measuring film protective plate 4.12, and a lower sample core protective plate 4.13. These three plates are arranged sequentially along the direction from the upper sample core 1.21 to the lower sample core 1.22. The measuring film protective plate 4.12 has a hollow groove 4.121 to accommodate the thermophysical property measuring film 4.7, thus forming a slit 4.14 of a certain volume on the protective plate 4.1 at the position of the hollow groove 4.121 with the upper and lower sample core protective plates 4.11 and 4.13. When the tobacco powder is pressed in the sample preparation mechanism, the thermophysical property measuring film 4.7 is located in the slit 4.14, as... Figure 2-6B As shown, to simplify the illustration of the position of the thermophysical property measuring film 4.7, the structures of the upper sample core protective plate 4.11 and the measuring film protective plate 4.12 are omitted from the figure. The pneumatic unit 5 is in a pressing state at this time, with the thermophysical property measuring film 4.7 positioned between the upper and lower tobacco blocks. The protective plate 4.11 protects the thermophysical property measuring film 4.7 from damage during pressing. After the tobacco bulk material is pressed, as shown... Figure 2-6CAs shown, in the first moving state, the pneumatic unit 5 is pulled backward by the telescopic cylinder of the pneumatic unit 5, thereby causing the protective plate 4.1 to be pulled out in a direction away from the sample preparation mechanism. The Hotdisk thermophysical property measurement sensor 4.6 is pressed on the upper plate 4.3 of the film, and the lower plate 4.4 of the film is always positioned at the geometric center of the material block under the clamping of the film positioning knob handle 4.5. Figure 2-6D As shown, in the second moving state, the pneumatic unit 5 is fully pulled back by the telescopic cylinder of the pneumatic unit 5. The gap left between the upper and lower tobacco blocks by the protective plate 4.1 is filled by the automatic expansion of the tobacco. In this way, the upper and lower tobacco blocks can tightly clamp the thermophysical property measuring film 4.7, resulting in a tobacco block holding the thermophysical property measuring sensor. During the process of pressing the loose tobacco into tobacco blocks, the Hotdisk thermophysical property measuring sensor 4.6 can remain outside the tobacco block, facilitating subsequent connection with measuring equipment to obtain the thermophysical property parameters of the tobacco block.

[0225] <Pneumatic Unit>

[0226] The pneumatic unit 5 is mounted on the front panel 7 and is connected to the protective tray 4.2 in the film positioning and clamping unit 4. It mainly includes: cylinder 5.1, cylinder mounting plate 5.2, and cylinder pull head 5.3.

[0227] like Figure 2-7 As shown, cylinder 5.1 is fixed to the front panel 7 via cylinder mounting plate 5.2. During the tobacco block production process, after the tobacco block is pressed, the protective support plate 4.2 is pulled backward by cylinder 5.1 via cylinder pull head 5.3, thereby removing the protective plate 4.1. The Hotdisk thermophysical property measurement sensor 4.6 is tightly sandwiched between the upper and lower tobacco blocks for subsequent thermophysical parameter measurement.

[0228] <Closed Institution>

[0229] A sealing mechanism 8 is installed at the openings of the upper sample core 1.21 and the lower sample core 1.22, thereby sealing the space containing the loose tobacco material. A piston rod 1.1 passes through the sealing mechanism 8 and connects to the automatic pressing unit 2, thereby pressing the loose tobacco material into tobacco blocks within the sample preparation mechanism. It mainly includes: an upper barrel cover 8.1, an upper screw positioning groove 8.11, an upper nut positioning groove 8.12, an upper barrel cover screw 8.2, an upper barrel cover nut 8.3, a lower barrel cover 8.4, a lower screw positioning groove 8.41, a lower nut positioning groove 8.42, a lower barrel cover screw 8.5, and a lower barrel cover nut 8.6.

[0230] As shown in Figures 2-8 to 2-10, the upper barrel cover 8.1 is located at the upper opening of the sample preparation mechanism 1. The upper barrel cover 8.1 has an upper screw positioning groove 8.11 and an upper nut positioning groove 8.12. The upper screw positioning groove 8.11 is U-shaped to accommodate the upper barrel cover screw 8.2, and the upper nut positioning groove 8.12 is a stepped shape to accommodate and fix the upper barrel cover nut 8.3.

[0231] After the tobacco material is filled into the sample tube 1.2, the upper lid 8.1 passes through the piston rod 1.1 to seal the opening. Then, the upper lid nut 8.3 is fixed in the upper nut positioning groove 8.12, and the upper lid screw 8.2 moves through the upper screw positioning groove 8.11 to the upper nut positioning groove 8.12. The upper lid screw 8.2 and the upper lid nut 8.3 are fixedly connected by rotation. Therefore, the lateral movement path of the upper end of the piston rod 1.1 is blocked to prevent uneven force during the pressing of the tobacco material.

[0232] The lower barrel cover 8.4 is installed at the lower opening of the sample preparation mechanism 1. The lower barrel cover has a lower screw positioning groove 8.41 and a lower nut positioning groove 8.42. The lower screw positioning groove 8.41 is U-shaped to accommodate the lower barrel cover screw 8.5, and the lower nut positioning groove 8.42 is stepped to accommodate and fix the lower barrel cover nut 8.6. After the tobacco material is filled into the sample preparation tube 1.2, the lower barrel cover passes through the piston rod 1.1 to fit and close the opening. Then, the lower barrel cover nut 8.6 is fixed in the lower nut positioning groove 8.42. The lower barrel cover screw 8.5 moves through the lower screw positioning groove 8.41 to the lower nut positioning groove 8.42, and the lower barrel cover screw 8.5 and the lower barrel cover nut 8.6 are fixedly connected by rotation. Therefore, the lateral movement path of the lower end of the piston rod 1.1 is blocked to prevent uneven force during the pressing of the tobacco material.

[0233] <Connection Components>

[0234] The connecting component 9 is used for fixing and replacing the sample preparation mechanism. After the first sample preparation tube 1.2 completes the pressing of the first batch of tobacco material, the connection between the sample preparation mechanism and the front panel 7 can be released through the connecting component 9, and the second sample preparation tube 1.2' can be replaced to press the second batch of tobacco material, thus improving production efficiency. The connecting component 9 includes: a buckle 9.1 and a locking handle 9.2. The locking handle 9.2 can be in the form of a knob handle.

[0235] like Figure 2-11As shown, the latches 9.1 are located at both ends of the film positioning and clamping unit 4 to fix the position of the sample preparation mechanism 1. The piston rod 1.1 passes through the sealing mechanism 8 to reach the pressure head mounting block 2.4, and the connection between the piston rod 1.1 and the pressure head mounting block 2.4 is fixed by the locking handle 9.2, thereby driving the automatic pressing unit 2 to move the piston rod 1.1 up and down, thus pressing the tobacco bulk into tobacco blocks for thermophysical parameter measurement. After the first batch of tobacco bulk is pressed into tobacco blocks, the rotating eccentric turntable 3.7 drives the rocker arm 3.8 to rotate in the direction of the arrow, causing the mounting plate 3.10 to descend. At this time, the cylinder pull head 5.3 disengages from the protective plate 4.1 to prevent the protective plate 4.1 from being unable to be pulled out when the sample preparation mechanism 1 is removed.

[0236] like Figure 2-12 As shown, open the latch 9.1 and locking handle 9.2, and remove the sample preparation mechanism 1 and the film positioning clamping unit 4 in the direction of the arrow, separating them from the front panel 7. Figure 2-13 As shown, the sample preparation mechanism 1 and the thin film positioning and clamping unit 4 are moved out of the front panel 7 as a whole.

[0237] like Figures 2-14 to 2-1 As shown in Figure 5, rotate the knob handle 1.3 in the direction of the arrow to open it, thereby releasing the locking connection between the sample cup support 1.4 and the first sample tube 1.2.

[0238] like Figure 2-16 As shown in Figure 2-17, remove the knob handle 1.3 in the direction of the arrow, thereby removing the knob handle 1.3 from the sample cup support 1.4. Specifically, as shown in Figure 2-17, the knob handle 1.3 is further fixed to the sample cup support 1.4 by a fixing nut component 1.31. Before removing the knob handle 1.3 from the sample cup support 1.4, the fixing nut component 1.31 needs to be unscrewed downwards to release the fixed connection between the knob handle 1.3 and the sample cup support 1.4. Then, remove the knob handle 1.3 from both the left and right sides.

[0239] The second sample preparation tube 1.2' to be replaced can be placed adjacent to the thin film positioning and clamping unit 4, such as... Figure 2-18 As shown, the upper sample core 1.21 and lower sample core 1.22 of the first sample tube 1.2 are removed sequentially from top to bottom along the arrow. Then, the upper sample core 1.21' and lower sample core 1.22' of the second sample tube 1.2' to be replaced are loaded and replaced into the film positioning and clamping unit 4 respectively. The loading and replacement process is as follows: Figures 2-19 to 2-23 As shown. During the material replacement process, the piston rod is pulled out to allow maximum space for the tobacco stock within the upper sample core 1.21' and lower sample core 1.22'.

[0240] like Figure 2-19As shown, the upper sample core 1.21' and lower sample core 1.22' are moved up and down and pulled out respectively in the direction of the arrow. The upper sample core 1.21' is rotated 180° in the direction of the arrow, so that the openings of both the upper and lower sample cores 1.21' and 1.22' face upwards. At this point, the upper and lower sample cores 1.21' and 1.22' are separated and open. As the second sample tube 1.2' to be replaced, the open state allows tobacco material to be loaded into the upper and lower sample cores 1.21' and 1.22' respectively. Conversely, as the first sample tube 1.2, the upper and lower sample cores 1.21 and 1.22 can also be separated and opened in the same way, facilitating the removal of tobacco material blocks.

[0241] As shown in Figure 2-20, the upper sample core 1.21' and the lower sample core 1.22' are in the open state for loading tobacco powder. After loading is completed, the lower sample core 1.22' is moved in the direction of the arrow to prepare for insertion and connection with the lower support 1.4 of the sample cup.

[0242] like Figure 2-21A As shown, the lower sample core 1.22' is inserted into one opening of the sample cup lower support 1.4, wherein the sample cup lower support 1.4 can be connected to the lower sample core 1.22' by interference fit. Figure 2-21B As shown, after the lower sample core 1.22' is connected to the sample cup support 1.4, the whole can be rotated 180° in the direction of the arrow. At this time, the opening of the lower sample core 1.22' is placed downward.

[0243] As shown in Figure 2-22, after the sample core 1.22' and the sample cup lower support 1.4 are flipped over, the upper sample core 1.21' moves in the direction of the arrow and is inserted into another cylinder opening of the sample cup lower support 1.4, in preparation for the assembly and connection of the upper sample core 1.21' and the lower sample core 1.22'.

[0244] like Figure 2-23 As shown, the assembly and connection of the upper sample core 1.21' and the lower sample core 1.22' are completed. At this point, the loading and replacement process of the sample tube 1.2' is finished, the piston rod 1.1' is compressed back into the sample tube 1.2', and then the knob handle 1.3 is reinstalled into the lower support 1.4 of the sample cup along the guide of the slot 1.41. Wherein, as Figure 2-24 As shown, the knob handle 1.3 can be reinstalled back into the sample cup lower support 1.4 via the fixing nut component 1.31.

[0245] After tightening the fixing nut 1.31 of the knob handle 1.3, as follows: Figure 2-25 As shown, the entire device is rotated 180° along the arrow to obtain... Figure 2-26As shown in the structure, the second sample preparation tube 1.2' is reassembled into the sample preparation mechanism 1 to await the pressing of the second batch of tobacco bulk material, thereby further obtaining the second batch of tobacco blocks.

[0246] like Figure 2-27 As shown, rotate the knob handle 1.3 in the direction of the arrow to lock it in place, so that the sample cup support 1.4 and the second sample tube 1.2' are locked together. Then, move the sample preparation mechanism 1 and the film positioning clamping unit 4 back into the front panel 7 in the direction of the arrow and reconnect them to the front panel 7.

[0247] like Figure 2-28 As shown, after the sample preparation mechanism 1 and the film positioning and clamping unit 4 return to the connection position with the front panel 7, the latch 9.1 and the locking handle 9.2 are closed, and the eccentric turntable 3.7 is rotated to drive the rocker arm 3.8 to raise the mounting plate 3.10, so that the cylinder pull head 5.3 reconnects to the protective plate 4.1, thereby pressing the second batch of tobacco bulk material.

[0248] <Tobacco Pulp Preparation>

[0249] A measured amount of loose tobacco material is loaded into the upper sample core 1.21 and the lower sample core 1.22, respectively, and assembled into a sample preparation tube 1.2, which, together with the sample cup support 1.4, forms the sample preparation mechanism 1. For details, please refer to... Figure 2-20A Place the upper sample core 1.21 and the lower sample core 1.22 with their openings facing upwards, and inject two equal portions of tobacco powder into the upper sample core 1.21 and the lower sample core 1.22 respectively. Simultaneously, as... Figure 2-6B The protective plate 4.1 is inserted into the sample cup lower support 1.4 as shown in the figure, but the thermophysical property measurement probe 4.7 has not yet been inserted into the sample cup lower support 1.4 at this time.

[0250] refer to Figure 2-22A As shown, the sample cup lower support 1.4 with protective plate 4.1 is placed on the lower sample core 1.22, and then inverted and flipped over to place on the upper sample core 1.21; then the knob handle 1.3 is installed into the slots 1.41 on both sides of the sample preparation mechanism, and the knob handle 1.3 is pressed to lock it. (Refer to...) Figure 2-24 As shown, the upper sample core 1.21 and the lower sample core 1.22 are connected to the sample cup lower support 1.4 as a whole.

[0251] refer to Figure 2-12As shown, the integrated sample preparation mechanism 1 is installed and fixed onto the automatic pressing unit 2; the sample cup lower support 1.4 and piston rod 1.1 are fixed with buckles 9.1 and upper and lower locking handles 9.2 respectively; then the Hotdisk thermophysical property measurement sensor 4.6 is manually inserted into the slit 4.14 formed by the protective plate 4.1, thus semi-fixing it between the upper sample core 1.21 and the lower sample core 1.22, and locked with the thin-film positioning knob fasteners 4.51 set at both ends of the Hotdisk thermophysical property measurement sensor 4.6. The upper film pressure plate 4.3 connected by the two thin-film positioning knob fasteners 4.51 and the lower film pressure plate 4.4 connected and fixed by the thin-film positioning knob handles 4.5 are used to press and fix the Hotdisk thermophysical property measurement sensor 4.6 and the sample cup lower support 1.4. At this time, the thermophysical property measurement film 4.7 is located at... Figure 2-6B The location shown.

[0252] The pressing operation parameters are set through the control system 6, such as material block thickness, pressing time, pressing speed, pressing distance, vibration frequency, and stepping time. The upper barrel cover 8.1 and lower barrel cover 8.4 are locked. The equipment pushes the piston rod 1.5 to begin pressing the tobacco material. After pressing, the eccentric turntable 3.7 rotates, and through the connected rocker arm 3.8, it drives the mounting plate 3.10 to move up and down, causing the groove of the protective support plate 4.2 to move and align with the cylinder pull head 5.3. The cylinder 5.1 then moves back, pulling out the protective support plate 4.2 along with the protective plate 4.1. Figures 2-6B to 2-6D At this time, the Hotdisk thermophysical property measurement sensor 4.6 and the thermophysical property measurement film 4.7 remain in their original positions. The upper and lower tobacco blocks expand under the action of pressure and their own elasticity to form a tobacco material block. Thus, the upper and lower surfaces of the thermophysical property measurement film 4.7 are in close contact with the tobacco material block to be clamped in it, thereby obtaining a tobacco material block containing the thermophysical property measurement sensor inside.

[0253] refer to Figure 2-9A and Figure 2-9B Using the upper lid screw 8.2, lower lid screw 8.5, upper lid nut 8.3, and lower lid nut 8.6, the upper and lower sealing mechanisms 8 are tightened, thereby locking the position of the upper and lower piston rods 1.1. This prevents the piston rods 1.1 from moving under the rebound of the tobacco blocks when the sample preparation mechanism 1, which is connected to the tobacco block, is removed from the automatic pressing unit 2, thus preventing changes in the volume and pressing density of the tobacco blocks.

[0254] Loosen the buckle 9.1 and the upper and lower locking handles 9.2 to remove the sample preparation mechanism 1, which is connected to the tobacco block, from the automatic pressing unit 2, so as to facilitate subsequent thermophysical parameter measurement tests.

[0255] After pressing is complete, remove the sample preparation mechanism 1 and replace it with a new sample preparation tube to press the second batch of tobacco bulk material. Repeat this step. The operation is simple and reduces the preparation time of tobacco blocks.

[0256] <Measurement of Thermophysical Properties of Tobacco Pulp>

[0257] The pressed tobacco block is placed into a measuring device, and a thermophysical property measuring sensor is connected to the measuring device. As one implementation method, the transient planar heat source method (TPS) can be used to measure the thermophysical parameters of the tobacco block, and the measuring device is a transient planar heat source thermal conductivity meter. The thermophysical property measuring sensor is a soft, flat, circular sheet made of thermally resistive material with a continuous double-helix structure and covered with a double-layer polyimide (Kapton) protective layer as the thermophysical property measuring film (hereinafter referred to as the "probe"). The probe diameter is generally above 12.8 mm. To obtain accurate and stable measurement results, the probe must be placed flat inside the tobacco block under the drive of the pneumatic unit 5. The radial / lateral dimension of the tobacco block is not less than twice the probe diameter, the axial / longitudinal stacking thickness is not less than the probe radius, both sides of the probe are in good contact with the sample, the density distribution of the tobacco block is uniform, and it is stably and consistently balanced to the set target temperature. The sample preparation mechanism, integrated with the tobacco block, is placed in a constant temperature and humidity chamber for equilibration at the set temperature. The signal line of the Hotdisk thermophysical property sensor 4.6 is connected to the Hotdisk thermophysical property measuring instrument (i.e., the measuring device). Once the equilibration temperature of the tobacco block reaches the set temperature and is sufficiently stable, the Hotdisk thermophysical property measuring instrument is activated to measure various thermophysical parameters of the tobacco block. During this process, the volume and density of the tobacco block must be maintained; therefore, the integrated sample preparation mechanism is not disassembled until the measurement is completed. Afterward, the tobacco block is removed, refilled, and the next round of tobacco block preparation and thermophysical property measurement is performed.

[0258] The terminology and expressions used herein are for descriptive purposes only, and the invention should not be limited to these terms and expressions. The use of these terms and expressions does not imply the exclusion of any illustrative and descriptive equivalents (or parts thereof), and it should be recognized that various modifications that may exist should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be considered to cover all such equivalents.

[0259] 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 pressure testing device, characterized in that, The pressure testing device is used in the tobacco slurry preparation system. The pressure testing device includes a loading mechanism, an automatic pressing unit, a control system, and a pressure sensing mechanism. The loading mechanism contains loose tobacco material, which is used to be compressed into tobacco blocks. The automatic pressing unit is connected to the loading mechanism, and the automatic pressing unit is driven by the control system to press the tobacco powder in the loading mechanism. The pressure sensing mechanism is used to measure the pressure on the tobacco powder during the pressing process.

2. The pressure testing device according to claim 1, characterized in that, The automatic pressing unit drives the tobacco slurry in the loading mechanism to move relative to each other at both ends along the pressing direction, thereby pressing the tobacco slurry from opposite directions simultaneously to form the tobacco block.

3. The pressure testing device according to claim 2, characterized in that, The pressure sensing mechanism is arranged opposite to the loading mechanism along the direction of the tobacco bulk compression. The pressure sensing mechanism includes a first pressure sensor, which is disposed on the contact surface between the loading mechanism and the tobacco bulk pressing direction.

4. The pressure testing device according to claim 3, characterized in that, The loading mechanism includes a sample preparation tube. The sample preparation tube includes an upper sample preparation core and a lower sample preparation core. The upper and lower sample cores are symmetrically arranged to form a piston structure facing each other. The pressure sensing mechanism includes a second pressure sensor, which is located at the connection between the upper sample core and the lower sample core, and is disposed opposite to the first pressure sensor.

5. The pressure testing device according to claim 4, characterized in that, The diameters of the first pressure sensor are [13-15) mm, [15-20) mm, [20-30) mm, or [30-40) mm.

6. The pressure testing device according to claim 4, characterized in that, The distance between the first pressure sensor and the inner wall of the loading mechanism is 0.10-0.20mm, 0.20-0.30mm, 0.30-0.40mm, or 0.40-0.50mm.

7. The pressure testing device according to claim 4, characterized in that, A flexible film is attached to the surface of the first pressure sensor. The diameter of the film is similar to that of the piston, and the film is not attached to the surface of the piston or cup holder. The thickness of the flexible film is 0.05-0.10 mm, 0.10-0.15 mm, or 0.15-0.20 mm.

8. The pressure testing device according to claim 4, characterized in that, The diameters of the second pressure sensor are [13-15) mm, [15-20) mm, [20-30) mm, or [30-40) mm.

9. The pressure testing device according to claim 4, characterized in that, The distance between the second pressure sensor and the inner wall of the loading mechanism is 0.10-0.20mm, 0.20-0.30mm, 0.30-0.40mm, or 0.40-0.50mm.

10. The pressure testing device according to claim 4, characterized in that, A flexible film is attached to the surface of the second pressure sensor. The diameter of the film is similar to that of the piston, and the film is not attached to the surface of the piston or cup holder. The thickness of the flexible film is 0.05-0.10 mm, 0.10-0.15 mm, or 0.15-0.20 mm.

11. The pressure testing device according to claim 4, characterized in that, The first pressure sensor is embedded in the contact surface between the loading mechanism and the tobacco bulk pressing direction, and the second pressure sensor is embedded in the connection part of the upper sample core and the lower sample core, thereby forming a flat tobacco block during the pressing of the tobacco bulk.

12. The pressure testing device according to claim 1, characterized in that, The pressure testing device also includes an automatic mixing unit. The loading mechanism is mounted and fixed on the automatic mixing unit, which drives the loading mechanism to reciprocate during the pressing of the tobacco bulk material.

13. The pressure testing device according to claim 12, characterized in that, The automatic mixing unit includes a mixing servo motor, an eccentric turntable, a rocker arm, and a mounting plate. The mixing servo motor is connected to the eccentric turntable. The eccentric turntable is connected to the mounting plate via the rocker arm. The mounting plate is connected to the loading mechanism. The mixing servo motor drives the eccentric turntable to move, thereby driving the loading mechanism to move in the up and down direction through the mounting plate.

14. A tobacco slurry preparation system, characterized in that, The tobacco slurry preparation system includes a pressure testing device. The pressure testing device includes a loading mechanism, an automatic pressing unit, a control system, and a pressure sensing mechanism. The loading mechanism contains loose tobacco material, which is used to be compressed into the tobacco block. The automatic pressing unit is connected to the loading mechanism, and the automatic pressing unit is driven by the control system to press the tobacco powder in the loading mechanism. The pressure sensing mechanism is used to measure the pressure on the tobacco powder during the pressing process.

15. The tobacco slurry preparation system according to claim 14, characterized in that, The pressure testing device is the pressure testing device as described in any one of claims 2-13.

16. A method for preparing measuring tobacco blocks based on a desired filling density, characterized in that, include: Step 1: Prepare a pressure testing device, which includes a loading mechanism, an automatic pressing unit, a control system, and a positioning clamping unit that holds a pressure sensor. Add tobacco slurry into the pressure testing device, press it according to different fitting sample preparation control parameters, and obtain different fitting tobacco slurry blocks. Record the filling density of each fitting tobacco slurry block. Step 2: Based on the sample preparation control parameters for fitting and the corresponding required filling density, determine the required sample preparation control parameters according to the required filling density; Step 3: Prepare the preparation device, which includes the loading mechanism, the automatic pressing unit, the control system, and the positioning clamping unit that holds the thermophysical property measurement sensor. Press the tobacco material into blocks for measurement according to the required sample preparation control parameters.

17. The method for preparing measuring tobacco blocks based on a desired filling density according to claim 16, characterized in that, The sample preparation control parameters for fitting and the required sample preparation control parameters respectively include pressing speed, vibration necessity, vibration frequency, vibration time and / or static equilibration time after vibration.

18. A measuring tobacco block prepared by the method for preparing measuring tobacco blocks based on a desired filling density according to claim 16 or 17.

19. The application of the measuring tobacco block according to claim 18 in the measurement of the thermophysical parameters of tobacco blocks.

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