Detection device and detection system for thermophysical property of aerial fog generation matrix

Abstract

The utility model discloses a device for detecting the thermophysical property of a matrix generated by aerial fog, which comprises two loading units, each loading unit comprises a loading cavity and a piston, the loading cavity extends along a first direction, one end of the loading cavity in the first direction is an open end, the piston is positioned in the loading cavity and can move along the first direction, and a loading area is formed between the open end and the piston along the first direction. The container is used for containing aerial fog generating substrates. The detection device further comprises a connecting chamber, the opening ends are inserted into the connecting chamber from the two opposite sides of the connecting chamber in the first direction, and the two opening ends are oppositely arranged in the first direction. The detection device further comprises a test probe which is used for detecting the thermophysical property of the aerial fog generating matrix and located between the open ends of the two loading cavities in the first direction. By means of the device, manufacturing of aerial fog generation matrix samples with different filling densities and different sizes is achieved, and the real state of heated cigarettes is simulated to detect thermophysical property data. The utility model also discloses a detection system.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of tobacco detection technology, especially to a kind of gas fog generating substrate thermal property detection device and detection system. BACKGROUND

[0002] Heated cigarette is a new type of tobacco product, which relies on heat source to heat tobacco material containing glycerol and other smoking agents for smoking. As can be seen, the heat transfer performance of tobacco segment (block) is one of the important factors that determine the amount of smoke (aerosol) and the composition of smoke (aerosol), so it is necessary to measure its thermal parameters. Transient plane source method (TPS method) is usually used for material thermal property detection.

[0003] Heated cigarette tobacco block is usually composed of filamentous tobacco material, and the cigarette size is small (usually not more than 8 mm in diameter), which does not meet the sample size requirement of transient plane source method probe (for example, the minimum sample size of Hotdisk TPS2500s thermal property detector is 0.6d2 in thickness, and the diameter is greater than 2.2d2, d2 is the diameter of probe sensor), and the cut tobacco cannot naturally agglomerate, so a method is needed to simulate the enlarged tobacco block. The TPS measurement probe is a polyimide film wrapped around the circuit, with a thickness of only 25um and a soft texture, which cannot be directly inserted into the high-density cut tobacco block, which may cause bending and affect the measurement accuracy or even damage. As a core component of the measurement system, it is relatively expensive. According to the method requirement, the probe needs to be kept flat during the intervention of the sample, during the sample preparation, and before and after the measurement, so a method is needed to design the probe to be flat and inserted into the cut tobacco block.

[0004] CN 102621178 A refers to a kind of cut tobacco thermal property on-line detection device and method in drum drying process, which mainly detects the thermal property of a large amount of cut tobacco accumulation in natural state. However, the cut tobacco filling density of actual cigarette smoking body is higher than the natural accumulation density, so this method is not suitable for detecting the actual density block of cigarette product. Due to the difference in cut tobacco form and chemical properties, the filling performance per unit volume in cigarette will change greatly, so it is necessary to simulate the thermal property test of cut tobacco block with different filling densities, and therefore a detection device, detection system and method are needed for detecting cut tobacco material to form block with series of different parameter levels.

[0005] CN 108181958 A refers to a kind of constant temperature and humidity test device and method suitable for tobacco thermal property measurement, which controls the sample temperature by water bath method. However, heated cigarette tobacco material usually has high glycerol content, which is easily hygroscopic, resulting in changes in moisture content of the material and distortion of thermal property data. Therefore, a detection device, detection system and method are needed to effectively control the temperature and humidity of the sample being measured.

[0006] In addition, how to make the tobacco sample meeting the TPS test requirement at lower cost and more convenient means is also a problem to be considered. Practical new type content

[0007] To solve the above technical problems, the embodiment of the utility model discloses a detection device for thermal physical property of aerosol generating substrate, comprising:

[0008] The loading unit is used for loading the aerosol generating substrate, and the loading unit is two, and respectively includes:

[0009] The loading cavity extends along the first direction, and one end in the first direction is an open end;

[0010] The piston is located in the loading cavity and can move along the first direction, and a loading area is formed between the open end and the piston along the first direction, and is used for loading the aerosol generating substrate;

[0011] The connecting chamber is two open ends respectively from the connecting chamber along the opposite two sides of the first direction inserts the connecting chamber, and the two open ends are oppositely arranged along the first direction;

[0012] The test probe is used for detecting the thermal physical property of the aerosol generating substrate, and is located between the open ends of the two loading cavities along the first direction.

[0013] By adopting the above technical scheme, the actual density state block body detection of the cigarette product can be simulated, the homogeneous aerosol generating substrate block body sample can be efficiently and reliably prepared, the production of the aerosol generating substrate block body sample with different filling densities and different sizes can be realized, the full contact of the probe and the sample can be ensured, the TPS method test can be effectively carried out, and the result is stable and accurate.

[0014] Optionally, the piston compresses the loading area, and the aerosol generating substrate located in the loading area is pushed to the test probe, and the aerosol generating substrate is in contact with the test probe.

[0015] Optionally, the test probe is inserted into the connecting chamber from the second direction, and the second direction is perpendicular to the first direction.

[0016] Optionally, it further includes a rigid support protection piece, and the support protection piece can be inserted into the connecting chamber along the second direction or removed from the connecting chamber along the second direction.

[0017] Optionally, before the piston compresses the loading area, the support protection piece is located in the connecting chamber and outside the test probe to protect the test probe.

[0018] Optionally, after the piston compresses the loading area, the support shield is removed from the connecting chamber, and the aerosol generating substrate is attached to the test probe.

[0019] Optionally, when the support shield is in the connecting chamber, the support shield covers the aerosol generating substrate.

[0020] Optionally, the support shield is one or two support plates, when the support plate is one, the support plate is located between one of the opening ends and the test probe, and the test probe is attached to one side of the support plate, when the support plate is two, the support plate is located between two of the opening ends, and the test probe is located between the two support plates.

[0021] Optionally, the support shield is a U-shaped groove, the U-shaped groove has an opening and a groove body extending in the second direction, and the test probe is inserted into the groove body from the opening.

[0022] Optionally, a plurality of loading units are further included, the loading units are distributed along the circumference of the connecting chamber, and the first direction is a horizontal direction.

[0023] Optionally, the loading cavity is a cylindrical barrel.

[0024] Optionally, the piston is pressed to completion when it reaches a preset position in the first direction, and the loading unit further includes a locking portion, which locks the piston at the preset position in the first direction.

[0025] Optionally, the loading cavity has a peripheral wall extending in the first direction, the peripheral wall has a locking hole located behind the preset position, and the locking portion can be inserted into the locking hole to lock the piston at the preset position in the first direction.

[0026] Optionally, the locking hole includes two pairs of locking holes arranged opposite to each other in the radial direction of the peripheral wall.

[0027] Optionally, the locking portion is a U-shaped rod, which can be inserted into the locking hole and pass through the loading cavity.

[0028] Optionally, the peripheral wall has a plurality of groups of locking holes, and there is a spacing between two adjacent groups of locking holes in the first direction.

[0029] Optionally, the test probe is a thin film probe.

[0030] Optionally, the thin film probe has a circular terminal, the diameter of the circular terminal is d2, the total length of the thin film probe in the axial direction of the thin film probe is d1, and d1>d2.

[0031] Optionally, the loading cavity has an inner diameter of 2.2d2 to 10 cm.

[0032] Optionally, the loading cavity has a wall thickness of 1 mm to d1-1.1d2.

[0033] Optionally, the circular terminal has a center distance from the inner wall of the loading cavity of d1 to 1.1d2.

[0034] Optionally, the opening end has a cross-sectional area of 3.81d2 2 to 78.54 cm 2 .

[0035] Optionally, after the piston is pressed, the aerosol generating substrate has a packing density of 0.1-0.8g / cm 3 .

[0036] Optionally, the loading cavity and the connecting chamber are made of the same material, and the material is one of metal, acrylic and glass.

[0037] According to another specific embodiment of the present application, the embodiment of the present application discloses a detection system for thermal physical properties of an aerosol generating substrate, comprising the detection device.

[0038] By adopting the above technical scheme, a series of tests can be conveniently simulated in the actual stacking state of the tobacco block, and all tests can control the temperature and relative humidity, thereby improving the consistency and accuracy of detection.

[0039] Optionally, the detection system further comprises a constant temperature and humidity chamber, the detection device is placed in the constant temperature and humidity chamber, so that the detection device performs thermal physical property detection in a constant temperature and humidity environment; a thermal physical property detector for detecting the thermal physical properties of the aerosol generating substrate and acquiring data, located outside the constant temperature and humidity chamber and connected with the test probe through a cable; and a computer connected with the thermal physical property detector through a data transmission line, used for receiving data transmitted by the thermal physical property detector and performing data processing.

[0040] Optionally, the detection system further comprises a supporting mechanism, the supporting mechanism comprises an extension rod and a tray fixedly connected to the extension rod, the extension rod extends from the outside of the constant temperature and humidity chamber to the inside of the constant temperature and humidity chamber, the tray is located in the inside of the constant temperature and humidity chamber, the tray is used for placing the detection device, and the supporting mechanism does not contact the constant temperature and humidity chamber.

[0041] Optionally, the constant temperature and humidity chamber has a metering and verifying hole on the top surface or the side surface, and the extension rod passes through the metering and verifying hole.

[0042] Optionally, the top surface or side surface of the constant temperature and humidity chamber has an opening with a diameter of 10-50 mm, and the extension rod passes through the opening. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 A detection device structure schematic diagram of an embodiment of the present application is shown.

[0044] Figure 2 A detection device structure schematic diagram after pressure application of an embodiment of the present application is shown.

[0045] Fig. 3(a) shows a structure schematic diagram of a connecting chamber along a first direction of an embodiment of the present application.

[0046] Fig. 3(b) shows a structure schematic diagram of a connecting chamber along a second direction of an embodiment of the present application.

[0047] Figure 4 A structure schematic diagram of a connecting chamber, a probe, and a support protection piece of an embodiment of the present application is shown.

[0048] Figure 5 A structure schematic diagram of a locking hole, a locking part, a piston, and a loading cavity of an embodiment of the present application is shown.

[0049] Figure 6 A test probe structure schematic diagram of an embodiment of the present application is shown.

[0050] Figure 7 A detection system schematic diagram of an embodiment of the present application is shown.

[0051] Fig. 8(a) shows a support mechanism schematic diagram of an embodiment of the present application.

[0052] Fig. 8(b) shows a support mechanism schematic diagram of another embodiment of the present application.

[0053] Figure 9 An example diagram of detection data of an embodiment of the present application showing obvious temperature drift is shown.

[0054] Figure 10 An example diagram of detection data of an embodiment of the present application not showing obvious temperature drift is shown.

[0055] 1. A detection device, 11. A loading unit, 12. A connecting chamber, 13. A test probe, 14. A support protection piece, 111. A loading cavity, 1111.

[0056] An open end, 1112. A peripheral wall, 1113. A locking hole, 112. A piston, 113. A loading area, 114. A locking part, 121. An opening part,

[0057] 122. socket, 131. round terminal, 151. opening, 152 slot body,

[0058] 2. aerosol generating substrate,

[0059] 3. constant temperature and humidity chamber,

[0060] 4. thermal property detector,

[0061] 5. computer,

[0062] 6. support mechanism, 61. extension rod, 62. tray

[0063] A. first direction, B. second direction, C. preset position DETAILED DESCRIPTION

[0064] The other advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the present description. Although the description of the present application will be introduced in combination with the preferred embodiments, it does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications which can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0065] It should be noted that in the present description, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0066] The terms "first", "second", and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0067] In the description of the present embodiments, it should also be noted that unless otherwise explicitly specified and limited, the terms "set", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiments can be understood according to the specific circumstances.

[0068] In order to make the purpose, technical scheme and advantages of the utility model clearer, the embodiments of the utility model will be described in further detail below with reference to the drawings.

[0069] In the embodiments of the utility model, the term "aerosol generating substrate" is used to describe a substrate that can be heated to generate an aerosol and delivered to a consumer, i.e. during use, volatile compounds are released from the aerosol generating substrate by heat transfer. The term "aerosol generating substrate" means that the aerosol generating substrate is made of or comprises an aerosol generating substrate that is capable of releasing volatile compounds to generate an aerosol upon heating. The aerosol generating substrate can be a solid aerosol generating substrate. The aerosol generating substrate can comprise a tobacco-containing material that contains volatile tobacco flavour compounds that are released from the substrate upon heating. The aerosol generating substrate can comprise a non-tobacco material. The aerosol generating substrate can comprise an aerosol former. The aerosol former can comprise at least one of glycerol and propylene glycol. In embodiments where the aerosol generating substrate is a solid aerosol generating substrate, the solid aerosol forming substrate can comprise one or more of: cut rag, powder, granules, pellets, shreds, a pasta, a strip or a sheet, containing one or more of: herbal plant leaves, tobacco leaves, tobacco ribbings, reconstituted tobacco, homogenised tobacco, extruded tobacco and expanded tobacco.

[0070] The first aspect of the utility model discloses a kind of detection devices of aerosol generating substrate thermophysical properties, as shown in Figure 1 And Figure 2 The detection device of aerosol generating substrate thermophysical properties 1 includes loading unit 11, connecting chamber 12, test probe 13.

[0071] Wherein, loading unit 11 is used to load aerosol generating substrate 2, and loading unit 11 is two, two loading units 11 respectively includes loading cavity 111, loading cavity 111 extends along first direction, and one end of loading cavity 111 in first direction is open end 1111.The shape of loading cavity 111 is not particularly limited. Specifically, the open end 1111 of two loading cavities 111 is oppositely arranged in the first direction. More specifically, the open end 1111 of two loading cavities 111 is oppositely spaced in the first direction. Further, each loading cavity 111 has two open ends 1111 in the first direction, and the loading cavity 111 is hollow structure along the first direction. More specifically, the first direction is, for example, the direction A as shown in Figure 1 And Figure 2 The direction A.

[0072] The loading unit 11 further comprises a piston 112 located in the loading cavity 111 and movable in the first direction, and a loading area 113 is formed between the open end 1111 and the piston 112 in the first direction, for loading the aerosol generating substrate 2. Since the piston 112 is movable in the first direction, when the piston moves to a position in contact with the aerosol generating substrate 2 and continues to move, the aerosol generating substrate 2, that is, the loading area 113, can be extruded, so that the aerosol generating substrate 2 can change from a natural stacking state to a relatively extruded state, thus simulating the state of a heated cigarette rod, and the test results can better reflect the actual situation of the heated tobacco product. Moreover, since the TPS method for detecting thermal properties is more suitable for bulk samples, extruding the aerosol generating substrate 2 can also change it to a sample state suitable for TPS detection, facilitating detection by this method. Specifically, the pistons 112 in the two loading units 11 are oppositely arranged in the first direction, and the extrusion directions of the aerosol generating substrates 2 in the two loading areas 113 are also opposite.

[0073] The detection device 1 further comprises a connecting chamber 12. Specifically, referring to FIG. 3(a) in combination, the connecting chamber 12 is a cavity structure. The two open ends 1111 are inserted into the connecting chamber 12 from opposite sides of the connecting chamber 12 in the first direction, and the two open ends 1111 are oppositely arranged in the first direction. Therefore, the connecting chamber 12 can serve as a medium for connecting the two loading units 11.

[0074] The detection device 1 further comprises a test probe 13 for detecting the thermal properties of the aerosol generating substrate 2. Specifically, the test probe 13 is inserted into the connecting chamber 12 from the second direction and located between the open ends 1111 of the two loading cavities 111 in the first direction, wherein the second direction is perpendicular to the first direction, for example, the second direction is as shown by direction B in FIG. 3(b). Figure 1 and Figure 2 Specifically, the connecting chamber 12 has a space extending in the second direction for the insertion of the test probe 13, and after the insertion of the test probe 13, the test probe 13 is located between the two open ends 1111 in the first direction, that is, the test probe 13 is located between the two loading areas 113 in the first direction, that is, the test probe 13 is located between the two pistons 112 in the first direction, and when the aerosol generating substrates 2 are loaded into the two loading cavities 111, respectively, the test probe 13 is located between the two aerosol generating substrates 2 in the first direction.

[0075] In the embodiments of the present application, during the use of the detection device 1, the aerosol generating substrate 2 in the loading area 113 is pushed against the test probe 13 by the compression of the piston 112, so that the aerosol generating substrate 2 comes into contact with the test probe 13, and thus the thermal property detection is performed.

[0076] Through the detection device, under cooperation of the loading cavities 111 and the pistons 112, the aerosol generating substrate 2 can be compressed to a degree that can reflect the actual stacking state of the heated cigarette, and the actual thermal properties of the heated cigarette can be better reflected. Moreover, different stacking states can be represented by controlling the compression degree, and the aerosol generating substrate 2 in different stacking states can be tested to obtain a series of test results. In addition, the device can be easily prepared into a block sample suitable for TPS testing, and the test results are stable and reliable. At the same time, the detection device can conveniently compress the aerosol generating substrate 2 by manpower, and the two loading cavities 111 can be selected to be pressed from the first direction, and the compression state of the heated cigarette can be simulated to the greatest extent at a lower cost. Therefore, the detection device has the advantages of high efficiency, accuracy, convenience and low cost.

[0077] In a specific embodiment of the present application, reference is made to Figure 1 , Figure 4 The detection device 1 further comprises a rigid support protection piece 14, which can be inserted into the connecting chamber 12 along the second direction or removed from the connecting chamber 12 along the second direction, that is, when the support protection piece 14 is inserted into the connecting chamber 12, it can be located between the two open ends 1111 in the first direction, that is, it can be located between the two pistons 112 in the first direction, and when the aerosol generating substrate 2 is loaded into the two loading cavities 111, it is located between the two aerosol generating substrates 2 in the first direction.

[0078] Before the pistons 112 compress the loading areas 113, the support protection piece 14 is located in the connecting chamber 12 and outside the test probe 13 to protect the test probe 13, and after the pistons 112 compress the loading areas 113, the support protection piece 14 is removed from the connecting chamber 12, and the aerosol generating substrate 2 is attached to the test probe 13. That is, during the entire compression process of the loading area 113, the support protection piece 14 can always protect the test probe 13 outside the test probe 13. The inventors consider that the test probe of TPS is relatively fragile and easy to deform, and if the test probe 13 is inserted into the aerosol generating substrate 2 after compression, the test probe 13 may be bent due to the large resistance, resulting in the need to replace the test probe 13, so the inventors choose to insert the test probe 13 before loading the aerosol generating substrate 2, but if the pressure is directly applied, there may be a possibility that the test probe 13 is deformed due to the pressure. Therefore, in order to further ensure that the test probe 13 is not affected, the inventors choose to protect the test probe 13 by the support protection piece 14, which gives the test probe 13 a rigid support to avoid deformation of the test probe 13 under stress. The support protection piece 14 can be removed after pressure is applied, which will not affect the test.

[0079] Further, when the support guard 14 is located in the connecting chamber 12, the support guard 14 covers the aerosol generating substrate 2, in other words, the support guard 14 can form a barrier between the two aerosol generating substrates 2, because the inventor considers that the two aerosol generating substrates 2 can be mixed together, the requirement of the TPS on the flatness of the end face of the test sample cannot be fully met, and the test result can be affected, therefore, by providing a rigid support guard 14 and cooperating with the piston 112 to apply pressure, the flatness and uniformity of the end face of the aerosol generating substrate 2 can be ensured, and the reliability of the test result is improved.

[0080] The inventor considers that the aerosol generating substrate 2 itself has a certain resilience, therefore, even if the support guard 14 is provided, after the support guard 14 is removed, the aerosol generating substrate 2 can contact the test probe 13 by using the resilience of the aerosol generating substrate 2 itself.

[0081] In an embodiment of the utility model, the thickness of the support guard 14 should be as small as possible, which can further ensure that the aerosol generating substrate 2 is attached to the test probe 13 during the test, and the test reliability is ensured.

[0082] In a specific embodiment of the utility model, the support guard 14 is a support plate, the support plate is located between the one open end 1111 and the test probe 13 in the first direction, the test probe 13 is attached to one side of the support plate, and the support plate provides rigid support for the test probe 13.

[0083] In a specific embodiment of the utility model, the support guard 14 is two support plates, at this time, the support plates are located between the two open ends 1111, and the test probe 13 is located between the two support plates to protect the test probe 13 from both sides.

[0084] In a specific embodiment of the utility model, as shown in Figure 4 Fig. 3(a), the support guard 14 is a U-shaped groove, the U-shaped groove has an opening 151 and a groove main body 152 extending in the second direction, and the test probe can be inserted into the groove main body 152 from the opening 151. By providing the U-shaped groove, the test probe 13 can be protected from both sides, and it is not necessary to insert two plates twice, and it is easier to remove at one time, and the use is more convenient.

[0085] Specifically, in the embodiment of the utility model, the insertion direction of the support guard 14 is opposite to the removal direction, and the test probe 13 can be stably left in the connecting chamber 12 when it is removed.

[0086] Specifically, as shown in Fig. 3(b), the connecting chamber 12 has an insertion opening 122 for the support guard 14 and the test probe 13. More specifically, the connecting chamber 12 has two insertion openings, which facilitates the removal of the support guard 14.

[0087] In one specific embodiment of the present application, as shown in Figure 5 the loading cavity 111 is a cylindrical body, which can more realistically simulate the state of heated cigarettes, and the cylindrical body can make the end face of the aerosol generating substrate 2 circular, so that the aerosol generating substrate 2 is more evenly stressed in each direction when stressed. Referring to FIG. 3(a), the opening part 121 of the connecting chamber 12 receiving the opening end 1111 is also circular at this time.

[0088] In one specific embodiment of the present application, the detection device 1 further comprises a plurality of loading units 11, and the plurality of loading units 11 are distributed along the circumference of the connecting chamber 12. At this time, the first direction is the horizontal direction. Since the heated cigarettes are formed by twisting and connecting, the aerosol generating substrate 2 will be subjected to a force distributed along the circumference of the cigarette, and therefore, through this arrangement, the internal state of the cigarette can be more realistically simulated.

[0089] In one specific embodiment of the present application, referring to Figure 2 and Figure 5 , the pressing is completed when the piston 112 reaches the preset position C in the first direction, and at this time, the aerosol generating substrate 2 has a filling density and can be tested. By setting the preset position, the aerosol generating substrate 2 can be more accurately brought to the desired filling density under manual pressing. For aerosol generating substrates 2 in different states, different preset positions can be set. For different simulation targets, different preset positions can also be set. The loading unit 11 further comprises a locking portion 114. The loading cavity 111 has a circumferential wall 1112 extending in the first direction, and the circumferential wall 1112 has a locking hole 1113 located behind the preset position C, that is, when the piston 112 is stressed from the original state and moves in the first direction, the end face of the piston 112 will first pass through the locking hole 1113 and then reach the preset position C. The locking portion 114 can be inserted into the locking hole 1113, so that the piston 112 is locked at the preset position C in the first direction, preventing the piston 112 from moving back, and ensuring that the aerosol generating substrate 2 remains in the same compressed state.

[0090] Further, the locking hole 1113 is two locking holes oppositely arranged in the radial direction of the circumferential wall 1112, and the locking portion 114 can be inserted from one of the two locking holes and drilled out from the other, giving the piston a more reliable locking force.

[0091] Preferably, further referring to Figure 5 , the locking hole 1113 comprises two pairs of locking holes oppositely arranged in the radial direction of the circumferential wall 1112, and the locking portion 114 is U-shaped. The locking portion 114 can be inserted from two of the locking holes and drilled out from the other two locking holes, penetrating through the loading cavity 111. At this time, the locking portion 114 can fully clamp the piston 112.

[0092] In some embodiments of the present application, a plurality of preset positions can be provided, which are distributed along the first direction, and each of the preset positions represents that the aerosol generating substrate 2 is compressed to different degrees, corresponding to different filling densities, and a series of tests can be performed. Therefore, a plurality of sets of locking holes 1113 are provided on the peripheral wall 1112, and there is a spacing between the two adjacent sets of locking holes 1113 in the first direction. It is only necessary to lock the piston 112 at different positions each time, which means that the aerosol generating substrate 2 has different filling densities, and tests can be conveniently performed.

[0093] In some embodiments of the present application, as shown in Figure 6 The test probe 13 is a film probe, and the film probe has a circular terminal 131, the diameter of the circular terminal 131 is d2, the total length of the film probe is d1 along the axial direction of the film probe, d1>d2, and the inner diameter of the loading cavity 111 is 2.2d2 to 10 cm, which can meet the requirements of TPS for sample size and the test results are more reliable. Preferably, the inner diameter of the loading cavity 111 is >3d2.

[0094] In some embodiments of the present application, the wall thickness of the loading cavity 111 is 1 mm to d1-1.1d2, which can further ensure that the test probe 13 is safely put in, ensure that the test probe 13 can be inserted along the second direction and always placed in the connecting chamber 12 along the second direction, and the distance between the circular terminal 131 and the inner wall of the loading cavity 111 can also further meet the size requirements of the detection method.

[0095] Preferably, 1 mm≤wall thickness≤5 mm, and the thinner thickness can ensure rapid heat exchange between the sample and the detection environment, and faster temperature balance of the sample.

[0096] In some embodiments of the present application, the shortest distance between the center of the circular terminal 131 and the inner wall of the loading cavity 111 is d1 to 1.1d2, i.e. d1≤shortest distance≤1.1d2, which further meets the size requirements of the detection method.

[0097] In some embodiments of the present application, when the piston 112 reaches the preset position C, the total thickness of the aerosol generating substrates 2 at both ends in the first direction is ≥0.6d2.

[0098] In some embodiments of the present application, the materials of the loading cavity 111 and the connecting chamber 12 are the same, which can be one of metal, acrylic and glass. Preferably, it is a metal material, which has a high thermal conductivity and can more quickly achieve temperature balance of the loading cavity 111 and the aerosol generating substrate 2 in the detection environment. More preferably, it is an aluminum alloy or a stainless steel material.

[0099] In a specific embodiment of the present application, the loading cavity 111 and the connecting chamber 12 are fixedly connected, for example, by glue, welding. The loading cavity 111 and the connecting chamber 12 can also be integrally formed. Specifically, the distance between the two loading cavities 111 in the first direction is not more than 1mm, and the normal insertion of the support protection piece 14 can be ensured.

[0100] In a specific embodiment of the present application, after the piston 112 finishes pressing, the aerosol generating substrate 2 has a packing density of 0.1-0.8g / cm 3 , which can widely reflect the thermal properties of different heated cigarette products.

[0101] The second aspect of the present application discloses a detection system for the thermal properties of an aerosol generating substrate, as shown in Figure 7 , which comprises the detection device 1, and further comprises a constant temperature and humidity chamber 3, a thermal property detector 4, and a computer 5.

[0102] The constant temperature and humidity chamber 3 is used to place the detection device 1, so that the detection device 1 performs thermal property detection in a constant temperature and humidity environment; the thermal property detector 4 is used to detect the thermal properties of the aerosol generating substrate 2 and obtain data, and is located outside the constant temperature and humidity chamber 3 and is connected with the test probe 13 through a cable; the computer 5 is connected with the thermal property detector 4 through a data transmission line, and is used to receive data transmitted by the thermal property detector 4 and perform data processing.

[0103] In a specific embodiment of the present application, as shown in FIGS. 8(a) and 8(b), the detection system further comprises a supporting mechanism 6, which comprises an extension rod 61 and a tray 62 fixedly connected to the extension rod 61. The extension rod 61 extends from the outside of the constant temperature and humidity chamber 3 to the inside of the constant temperature and humidity chamber 3, and the tray 62 is located in the inside of the constant temperature and humidity chamber 3, and the tray 61 is used to place the detection device 1. The supporting mechanism 6 can be a single-bar-shaped shelf, and the extension rod 61 extends from it. The supporting mechanism 6 can also be a box, and the extension rod 61 extends from it. Through the supporting mechanism 6, it can be ensured that the supporting mechanism 6 and the detection device 1 do not contact the box of the constant temperature and humidity chamber 3, and the uniformity of the temperature and humidity of the aerosol generating substrate 2 is ensured.

[0104] Specifically, the top surface or side surface of the constant temperature and humidity chamber 3 has a metering hole, and the extension rod 61 passes through the metering hole. The metering hole is a hole reserved by an instrument or device. The inventor uses the metering hole provided in the constant temperature and humidity chamber 3 to set the extension rod 61, which can realize the functions of various devices and will not affect the stability of the inside of the constant temperature and humidity chamber 3, preventing the outside environment from affecting the inside of the constant temperature and humidity chamber 3.

[0105] Specifically, the top surface or side surface of the constant temperature and humidity box 3 has an opening with a diameter of 10-50 mm, and the extension rod 61 passes through the opening. When the constant temperature and humidity box 3 does not have a metering and calibration hole, the constant temperature and humidity box 3 can be opened, and the diameter of the opening is ensured to prevent the exchange of the internal and external environments of the constant temperature and humidity box 3.

[0106] The third aspect of the utility model discloses a method for thermophysical property detection using the above detection system, comprising the following steps:

[0107] The detection device 1 is used to press the aerosol generating substrate 2 to obtain an aerosol generating substrate 2 sample with a certain filling density and suitable for TPS testing.

[0108] Balancing: after the pressing is completed, the detection device 1 is placed in the constant temperature and humidity box 3 for 45-180 min to prevent temperature drift in subsequent tests.

[0109] Detection and data processing: the thermophysical property detector 4 is used for thermophysical property detection, and the computer 5 is used for data processing.

[0110] Specifically, the pressing of the detection device 1 on the aerosol generating substrate 2 comprises:

[0111] Inserting the test probe: the test probe 13 is inserted into the connecting chamber 12 along the second direction, so that the test probe 13 is located between the opening ends 1111 of the two loading cavities 111 along the first direction,

[0112] Pressing: two portions of aerosol generating substrates 2 with the same mass are weighed and placed in the loading areas 113, respectively, and the piston 112 is used to compress the loading areas 113 along the first direction, so that the aerosol generating substrates 2 in the loading areas 113 are pushed against the test probe 13, and the aerosol generating substrates 2 are in contact with the test probe 13.

[0113] Through the above method, the state of the aerosol generating substrate 2 in a heated cigarette can be fully simulated by manual means at low cost, and reliable test results can be obtained.

[0114] In a specific embodiment of the utility model, the step of inserting the test probe 13 also includes inserting the support protection piece 14 along the second direction before the step of inserting the test probe 13, and the step of pressing also includes removing the support protection piece 14 along the second direction after the step of pressing, and the aerosol generating substrate 2 is in contact with the test probe 13.

[0115] In a specific embodiment of the utility model, in the step of pressing, the piston 112 finally reaches the preset position C in the first direction, and the pressing is completed.

[0116] Specifically, after the step of pressing, the step of inserting the locking part 114 into the locking hole 1113 to lock the piston 112 at the preset position C in the first direction is further included.

[0117] In a specific embodiment of the present application, the distance between the preset position C and the opening end 1111 in the first direction is 0.6d2 to 10 cm, and the cross-sectional area of the opening end 1111 is 3.81d2 2 to 78.54 cm 2 After pressing, the filling density of the aerosol generating substrate 2 is 0.1-0.8 g / cm 3 For the same detection device 1, by determining the distance between the preset position C and the opening end 1111 in the first direction, the filling density of the aerosol generating substrate 2 can be ensured to be within 0.1-0.8 g / cm 3 In addition, when using different detection devices 1, the cross-sectional area of the opening end 1111 and the distance between the preset position C and the opening end 1111 in the first direction can be used to ensure the range of the filling density. Moreover, when using test probes 13 of different specifications, the cross-sectional area of the opening end 1111 can be selected to meet the sample requirements of the TPS detection method.

[0118] In a specific embodiment of the present application, the temperature range controlled by the constant temperature and humidity chamber 3 is 0-100℃, and the relative humidity range is 10-95% RH, which can meet the different testing requirements of heated cigarette products.

[0119] In a specific embodiment of the present application, the heating power of the thermal property detection is 20-40 mW, and the test time is 160 s or 320 s.

[0120] Specifically, by using the detection method of the present application, the setting of the thermal property detection parameters ensures that the overall temperature rise of the detection data is within 2-5 K, the overall specific characteristic time is within 0.33-1, the average deviation is within 10 -4 and below, and the detection depth is within the detectable range, which meets the control of the process parameters by the detection method and can achieve good test results.

[0121] Preferably, the heating power is 25 mW, and the test time is 160 s, which has lower time and power consumption costs.

[0122] Specifically, the detection method of the present application can realize thermal property detection of an aerosol generating substrate with a filling density of 0.1-0.8 g / cm 3 , and more specifically, thermal property detection of an aerosol generating substrate block with a filling density of 0.1-0.8 g / cm 3 . Specifically, it can be used for 0.1-0.6 g / cm 3 traditional cigarette tobacco block, 0.1-0.6 g / cm 3 papermaking process sheet block, and 0.2-0.8 g / cm 3Thermal property detection of the roll-pressed sheet block.

[0123] The following will be described in conjunction with more specific embodiments.

[0124] Application Example 1:

[0125] Thermal property detection of the cut tobacco in Application Example 1 was performed. The loading cavity was a cylindrical barrel with an inner diameter of 40 mm, an outer diameter of 50 mm, and a wall thickness of 5 mm.

[0126] The specific sample preparation method was as follows:

[0127] The loading unit was connected and fixed with the connecting chamber;

[0128] The support protection piece was inserted into the connecting chamber along the second direction, the 5501F2 detection probe was inserted from the other end of the tobacco along the second direction and laid on the support protection piece, the probe was fixed to avoid movement;

[0129] Two portions of 12.56 g of cut tobacco were weighed using a balance, respectively, and were filled into the two loading areas from the two open ends, respectively, and the pistons were inserted against the cut tobacco, the pistons were pushed forward along the first direction on both sides at the same time until the end face of the piston reached the preset position, the distance between the preset position and the open end was 20 mm, the cut tobacco was in contact with the film probe, at this time, the filling density of the prepared cut tobacco sample was 0.5 g / cm 3 .

[0130] The locking part was inserted into the locking hole to prevent the piston from moving back;

[0131] The detection device was placed in a constant temperature and humidity box for 60 min, the temperature was 22℃, and the relative humidity was 60%.

[0132] Thermal property detection was performed using a Hotdisk TPS2500s thermal property detector, the measurement time was 160 s, the heating power was 25 mW, and data processing was performed using a computer.

[0133] Three parallel tests were performed, the test results are shown in Table 1, and the average (AVE), standard deviation (STD), and relative standard deviation (RSD) were calculated.

[0134] Table 1. Detection data of Application Example 1

[0135] Type Thermal conductivity W / mK Thermal diffusivity mm2 / s 2 / s]]> Volumetric specific heat MJ / m 3 K]] 1 0.1126 0.1236 0.9108 2 0.1073 0.1300 0.8324 3 0.1048 0.1191 0.8815 AVE 0.1082 0.1242 0.8749 STD 0.0040 0.0055 0.0396 RSD 3.6932 4.4353 4.5272

[0136] It can be seen that the data of Application Example 1 has good repeatability, and the relative standard deviations of the three thermal property indicators are all less than 5%.

[0137] Application Comparative Example 1:

[0138] The loading unit of the detection device used in Comparative Example 1 is a powder thermal property test conventional sample preparation device, which is a circular tube-shaped sample preparation cylinder with an inner diameter of 40 mm and a height of 40 mm, sealed at the bottom, and having a semicircular long slot with a width of 5 mm at a distance of 20 mm from the bottom.

[0139] The same cut tobacco used in Comparative Example 1 and Example 1 is used in the present application, and the temperature and humidity are consistent during testing.

[0140] During sample preparation, 12.56 g of tobacco sample is placed into the cylinder through the end of the cylinder and is compacted, and the probe is placed in the long slot, with the center of the circular end located at the center of the tobacco block end face.

[0141] After the probe is placed, another sample is placed into the sample preparation cylinder, and the sample is filled into the sample preparation cylinder by manual pressing, and a weight is used to seal the opening of the sample preparation cylinder.

[0142] Three parallel tests are performed, and the mean, standard deviation and relative standard deviation are calculated, and the results are shown in Table 2.

[0143] Table 2. Test data of Comparative Example 1

[0144] Type Thermal conductivity W / mK Thermal diffusivity mm2 / s 2 / s]] Volumetric specific heat MJ / m 3 K]] 1 0.1165 0.1154 1.0094 2 0.1018 0.1323 0.7693 3 0.0982 0.1551 0.6332 AVE 0.1055 0.1343 0.8040 STD 0.0097 0.0199 0.1905 RSD 9.1868 14.8326 23.6923

[0145] It can be seen that the data repeatability of Comparative Example 1 is poor, which is particularly evident in the relative standard deviation (RSD). Moreover, in actual operation, the thickness of the sample block is fixed and cannot be freely adjusted; in actual sample preparation operation, the thin film probe is easily deformed, and it is extremely easy to slip out of the slot, resulting in sample preparation failure; when the sample filling quality is high, it is difficult to press the sample to the specified thickness by manual pressing.

[0146] Example 2:

[0147] The sample prepared in Example 2 is the same as that prepared in Example 1, and the test instrument and test environment are also the same. The loading chamber and connecting chamber are made of aluminum alloy, and the wall thickness of the loading chamber is about 2 mm.

[0148] When placed in the constant temperature and humidity chamber, test every 15 min, observe the temperature drift, and record the time when there is no obvious temperature drift for the first time. There is no obvious temperature drift after 45 min of equilibrium. Examples with obvious temperature drift are shown in Figure 9 , and examples without obvious temperature drift are shown in Figure 10 .

[0149] Example 3:

[0150] The loading chamber and connecting chamber are made of acrylic glass, and the wall thickness of the loading chamber is about 10 mm.

[0151] The rest is the same as Example 2.

[0152] Application Example 3 had no obvious temperature drift phenomenon in 75 min of equilibration.

[0153] Application Example 4:

[0154] Application Example 4 refers to Application Example 1.

[0155] Application Example 4 had a loading cavity inner diameter of 40 mm, and each portion of tobacco had a mass of 15.08 g.

[0156] First, the piston was brought to a first preset position, which was 30 mm from the open end, the piston was locked, the support guard was withdrawn, and the tobacco block had a bulk density of 0.4 g / cm3at this time. 3 The first thermal physical property index was detected.

[0157] After detection, the locking structure was opened, the piston was released, the support guard was inserted, the two pistons were simultaneously pushed, the piston was brought to a second preset position, which was 24 mm from the open end, the piston was fixed, the support guard was withdrawn, and the tobacco block had a bulk density of 0.5 g / cm3at this time. 3 The second thermal physical property index was detected.

[0158] After detection, the locking structure was opened, the piston was released, the support guard was inserted, the two pistons were simultaneously pushed, the piston was brought to a third preset position, which was 20 mm from the open end, the piston was fixed, the support guard was withdrawn, and the tobacco block had a bulk density of 0.6 g / cm3at this time. 3 The third thermal physical property index was detected.

[0159] In this application example, one portion of a detection sample was placed, and the thermal physical property detection of tobacco blocks with different bulk densities was completed, which greatly improved the detection efficiency.

[0160] Table 3. Three detection data of Application Example 4

[0161]

[0162] Application Examples 5-10:

[0163] In Application Examples 5-10, compared to Application Example 1, only the heating power and the measurement time during detection were changed. The heating power, the measurement time, the probe depth, the total temperature rise, the total specific characteristic time, and the average deviation of each application example are shown in Table 4.

[0164] Table 4. Detection data of Application Examples 5-10

[0165]

[0166] It can be seen that the 15mW heating power cannot meet the overall temperature rise requirement of 2-5K, and the 20mW and 25mW can meet the condition; the 80s measurement time cannot meet the overall specific characteristic time of 0.33-1, and the 160s can meet the condition. It can be found that the overall temperature rise is mainly affected by the heating power, and the overall specific characteristic time is mainly affected by the measurement time, so the utility model preferably selects the heating power of 20-40mW, and the measurement time of 160s and 320s; further from the time, the power consumption cost, the heating power of 25mW and 160s is preferably selected.

[0167] Although the utility model has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood that the above description is a further detailed description of the utility model in connection with specific embodiments and cannot be deemed as limiting the specific implementation of the utility model to these descriptions. Those skilled in the art can make various changes in form and details, including making a number of simple derivations or substitutions, without departing from the spirit and scope of the utility model.

Claims

1. A device for detecting the thermal properties of an aerosol generating substrate, characterized in that, The application relates to a device for testing the thermal physical properties of an aerosol generating substrate, comprising: a loading unit for loading the aerosol generating substrate, the loading unit being two, each comprising: a loading cavity extending along a first direction and having an open end at one end in the first direction; a piston located in the loading cavity and movable along the first direction, the open end and the piston forming a loading area for loading the aerosol generating substrate along the first direction; a connecting chamber, the two open ends being inserted into the connecting chamber from opposite sides of the connecting chamber along the first direction, and the two open ends being oppositely arranged along the first direction; a test probe for detecting the thermal physical properties of the aerosol generating substrate, the test probe being located between the open ends of the two loading cavities along the first direction.

2. The apparatus of claim 1, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The piston compresses the loading area, and the aerosol generating substrate located in the loading area is pushed against the test probe, and the aerosol generating substrate is in contact with the test probe.

3. The apparatus of claim 2, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The test probe is inserted into the connecting chamber from a second direction, and the second direction is perpendicular to the first direction.

4. The apparatus of claim 3, wherein the thermal property of the aerosol- generating substrate is determined by the controller based on the temperature of the aerosol- generating substrate and the temperature of the heating element. Further comprising a rigid support guard, the support guard being insertable into the connecting chamber along the second direction or being removable from the connecting chamber along the second direction.

5. The apparatus of claim 4, wherein the thermal property of the aerosol- generating substrate is determined by the controller based on the temperature of the aerosol- generating substrate and the temperature of the heating element. Before the piston compresses the loading area, the support guard is located in the connecting chamber and outside the test probe to protect the test probe.

6. The apparatus of claim 4, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. After the piston compresses the loading area, the support guard is removed from the connecting chamber, and the aerosol generating substrate is in contact with the test probe.

7. The apparatus of claim 4, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. When the support guard is located in the connecting chamber, the support guard covers the aerosol generating substrate.

8. The apparatus of claim 4, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The support guard is one or two support plates, when the support plate is one, the support plate is located between one of the open ends and the test probe, and the test probe is in contact with one side of the support plate, and when the support plate is two, the support plate is located between the two open ends, and the test probe is located between the two support plates.

9. The apparatus of claim 4, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The support guard is a U-shaped groove, the U-shaped groove has an opening and a groove body extending along the second direction, and the test probe is inserted into the groove body from the opening.

10. The apparatus of claim 1, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. Further comprising a plurality of the loading units, the loading units being distributed along the circumference of the connecting chamber, and the first direction being a horizontal direction.

11. The apparatus of claim 1, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The loading cavity is a cylindrical barrel.

12. The apparatus of claim 11, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The piston is pressed to a preset position along the first direction, and the loading unit further comprises a locking portion, the locking portion locking the piston at the preset position along the first direction.

13. The apparatus of claim 12, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The loading cavity has a peripheral wall extending along the first direction, the peripheral wall has a locking hole, the locking hole is located behind the preset position, and the locking portion can be inserted into the locking hole to lock the piston at the preset position along the first direction.

14. The apparatus of claim 13, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The locking hole comprises two pairs of locking holes oppositely arranged along the radial direction of the peripheral wall.

15. The apparatus of claim 14, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The locking portion is a U-shaped rod, the locking portion can be inserted into the locking hole and penetrate through the loading cavity.

16. The apparatus of claim 15, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The peripheral wall has a plurality of groups of locking holes, and there is a spacing between adjacent two groups of locking holes along the first direction.

17. The apparatus of claim 11, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The test probe is a film probe.

18. The apparatus of claim 17, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The thin film probe has a circular terminal with a diameter of d2, and a total length of the thin film probe along the axial direction of the thin film probe is d1, d1>d2.

19. The apparatus of claim 18, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The inner diameter of the loading cavity is 2.2d2 to 10 cm.

20. The apparatus of claim 19, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The wall thickness of the loading cavity is 1 mm to d1-1.1d2.

21. The apparatus of claim 19, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The shortest distance between the center of the circular terminal and the inner wall of the loading cavity is d1 to 1.1d2.

22. The apparatus of claim 19, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The cross-sectional area of the open end is 3.81d2 2 to 78.54 cm 2 .

23. The apparatus of claim 2, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The aerosol generating substrate has a fill density of 0.1-0.8 g / cm 3 after the end of the pressure application by the piston.

24. The apparatus of claim 1, wherein the thermal property of the aerosol- generating substrate is determined by measuring a temperature of the aerosol-generating substrate. The material of the loading cavity and the connecting chamber is the same, and the material is one of metal, acrylic and glass.

25. A system for detecting thermal properties of an aerosol generating substrate, the system comprising: The detection device comprises the detection device according to any one of claims 1-24.

26. A system for detecting thermal properties of an aerosol generating substrate as claimed in claim 25, wherein, Further comprising: A constant temperature and humidity chamber, the detection device is placed in the constant temperature and humidity chamber, so that the detection device performs thermal physical detection in a constant temperature and humidity environment; A thermal physical property detector for detecting the thermal physical properties of the aerosol generating substrate and obtaining data, which is located outside the constant temperature and humidity chamber and connected to the test probe through a cable; A computer connected to the thermal physical property detector through a data transmission line for receiving data from the thermal physical property detector and processing the data.

27. A system for detecting thermal properties of an aerosol generating substrate as claimed in claim 26, wherein, Further comprising a supporting mechanism, the supporting mechanism comprises an extension rod and a tray fixedly connected to the extension rod, the extension rod extends from the outside of the constant temperature and humidity chamber to the inside of the constant temperature and humidity chamber, the tray is located in the inside of the constant temperature and humidity chamber, the tray is used for placing the detection device, and the supporting mechanism does not contact the constant temperature and humidity chamber.

28. A system for detecting thermal properties of an aerosol generating substrate as claimed in claim 27, wherein, The top surface or side surface of the constant temperature and humidity chamber has a metering calibration hole, and the extension rod passes through the metering calibration hole.

29. The system for detecting thermal properties of an aerosol generating substrate of claim 27, wherein, The top surface or side surface of the constant temperature and humidity chamber has an opening with a diameter of 10 to 50 mm, and the extension rod passes through the opening.

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