Heating element contamination test fixture

Abstract

The utility model discloses develop heat -generating element is polluted test frock, include: casing, be equipped with opening on the outside wall, heat -generating element is detachably connected with casing, include: heating body, located the outside of casing, electric connecting piece, be located heating body's tail end, from outside to inside through the opening, stretch into the inside of casing, smoke cabin subassembly, cover set up heat -generating element's outer periphery, with casing detachably connected, be used to accommodate aerosol generating article, wherein, smoke cabin subassembly can move in the axial direction of heat -generating element along the direction of moving away from heat -generating element, to drive aerosol generating article whole body and separate heat -generating element, circuit control unit, be located in the casing, be used to control the power supply process to heat -generating element, to make heat -generating element heat aerosol generating article, and detect the electrical parameter of heat -generating element in the heating process, include: terminal, with electric connecting piece detachable electric connection. The frock structure is open, and different heat -generating elements can be replaced conveniently and test.

Description

Technical Field

[0001] This utility model relates to the field of novel tobacco product testing technology, specifically to a testing fixture for contamination of heating elements. Background Technology

[0002] Heated cigarettes are a relatively new product in the international tobacco market, producing an aerosol by heating tobacco materials for inhalation. Currently, heating devices for tobacco materials are mainly divided into two types: core heating and peripheral heating. Core heating devices commonly use metal-ceramic heating elements or needles. However, repeated contact between the heating element and the heated tobacco material has revealed contaminants on its surface, affecting the force required to pull the cigarette out after smoking. Furthermore, the accumulation of contaminants on the heating element surface may have other unknown effects. Researching these effects using existing devices faces two major challenges: first, the closed nature of existing device systems significantly limits temperature adjustment, replacement, and measurement of the heating element; second, the high cost of experimentation, for example, obtaining a contaminated heating element requires disassembling and destroying the heating device. Utility Model Content

[0003] This invention proposes a testing fixture for contamination of heating elements to solve the aforementioned technical problems.

[0004] In a first aspect, the present invention discloses a testing fixture for contamination of heating elements, comprising:

[0005] The casing has an opening on its outer side wall;

[0006] The heating element, detachably connected to the housing, includes:

[0007] The heating element is located outside the casing;

[0008] An electrical connector is located at the tail end of the heating element, passes through the opening from the outside to the inside, and extends into the housing.

[0009] The smoke chamber assembly is fitted around the outer periphery of the heating element and is detachably connected to the housing. It is used to contain the aerosol-generated product. The smoke chamber assembly can move along the axial direction away from the heating element to drive the aerosol-generated product to detach from the heating element as a whole.

[0010] A circuit control unit, located within the housing, controls the power supply to the heating element to heat the aerosol and generate the product, and detects the electrical parameters of the heating element during the heating process, including:

[0011] Terminal blocks are detachably electrically connected to electrical connectors.

[0012] By adopting the above technical solution, the heating element contamination test fixture of this utility model has a relatively open structure, low cost, and is easy to replace with heating elements with different shapes of heating bodies and electrical connectors. It is also easy to use in conjunction with other testing equipment to conduct different tests on heating elements that have been heated to form aerosol products.

[0013] According to another specific embodiment of the present invention, it further includes:

[0014] A convex ring is provided on the outer side wall of the housing and surrounds the opening, extending in a direction away from the outer side wall of the housing;

[0015] A guide groove is provided on the inner peripheral wall of the convex ring. The guide groove includes: an axial guide groove extending along the axial direction of the convex ring; and a circumferential locking groove extending from one end of the axial guide groove along the circumference of the convex ring and communicating with the axial guide groove.

[0016] The smoke chamber assembly includes: a smoke chamber body for containing aerosol-generated products; and a smoke chamber base located at the end of the smoke chamber body, wherein the outer peripheral wall of the smoke chamber base has an outwardly protruding portion.

[0017] The protrusion can slide into the axial guide groove along the axial direction of the protruding ring, and then rotate along the circumference of the protruding ring to fit into the circumferential locking groove so that the smoke chamber assembly engages with the protruding ring; the protrusion can rotate along the circumference of the protruding ring to slide out of the circumferential locking groove, and then slide out of the axial guide groove along the axial direction of the protruding ring so that the smoke chamber assembly disengages from the protruding ring.

[0018] According to another specific embodiment of the present invention, the smoke chamber body includes: a chamber body; a smoke lifter, including: a receiving cavity for receiving aerosol-generated products; a smoke lifter shell, sleeved on the outer periphery of the chamber body and detachably connected to the chamber body, including: a top shell, located at the top of the receiving cavity and fixedly connected to the receiving cavity, having an opening for inserting the aerosol-generated products and oppositely arranged through holes; a non-elastic traction rope, with both ends of the non-elastic traction rope passing through the through holes to be fixedly connected to the top shell;

[0019] Specifically, a non-elastic traction rope is pulled along the axial direction away from the cabin body to lift the smoke device out of the cabin body, thereby causing the aerosol generating product to detach from the heating element.

[0020] According to another specific embodiment of the present invention, the receiving cavity has a bottom wall, and the smoke lifter further includes:

[0021] The first perforation is located in the center of the bottom wall, allowing the heating element to pass through;

[0022] Multiple second perforations are located on the bottom wall and distributed around the first perforation to allow airflow.

[0023] According to another specific embodiment of the present invention, the heating element further includes:

[0024] The flange seat is fixed to the tail end of the heating element, and the electrical connector is located at the bottom of the flange seat;

[0025] The heating element contamination test fixture also includes a heating element fixing assembly, which includes: an upper cover with a heating element through hole; a lower cover with an electrical connector through hole, forming a cavity with the upper cover; a flange seat located in the cavity; the heating element protrudes through the heating element through hole; and the electrical connector protrudes through the electrical connector through hole.

[0026] According to another specific embodiment of the present invention, it further includes: a heating element fixing assembly, including: a first base; a second base, which is disposed opposite to the first base, and a slot space is formed between the opposite side walls of the first base and the second base, and the heating element is engaged in the slot space.

[0027] According to another specific embodiment of the present invention, the terminal block is a screw-fixed terminal block, comprising: a wire channel for accommodating an electrical connector; and a screw channel, which is perpendicular to and communicates with the wire channel for accommodating a screw; wherein, the screw passes through the screw channel to press and fix the electrical connector within the wire channel; when the screw exits the screw channel, the pressure of the screw on the electrical connector is released, and the electrical connector can be removed from the wire channel.

[0028] According to another specific embodiment of the present invention, the top wall of the housing is provided with a wiring opening, and the heating element contamination test fixture further includes: a cover, which covers the wiring opening and is detachably connected to the housing. When the cover is separated from the housing, the entrance of the screw channel is exposed, and the screw can pass through or out of the screw channel.

[0029] According to another specific embodiment of the present invention, the wiring terminal is a pluggable wiring terminal, including: a first connector, which is fixedly connected to the circuit control unit; and a second connector, which is fixedly connected to the heating element; wherein the first connector and the second connector are pluggable and pluggable, and the heating element and the circuit control unit can be electrically connected or disconnected by plugging and unplugging the first connector and the second connector.

[0030] Alternatively, the terminal block is a push-button type terminal block, comprising: a terminal body; a push-button operation part disposed at the upper end of the terminal body; and a wire clamping mechanism disposed inside the terminal body and drivenly cooperating with the push-button operation part for clamping electrical connectors; wherein, by pressing or releasing the push-button operation part, the wire clamping mechanism can be switched between an open state and a closed state; in the open state, the electrical connector can extend into or out of the wire clamping mechanism; in the closed state, the wire clamping mechanism can clamp the electrical connector that has extended into the wire clamping mechanism.

[0031] According to another specific embodiment of this utility model, it also includes a power supply, the heating element has a room temperature resistance and a temperature coefficient of resistance, and the circuit control unit further includes:

[0032] A semiconductor switching element, the power transmission terminal of which is connected to a heating element, outputs power to the heating element;

[0033] The driving element has its output terminal connected to the signal input terminal of the semiconductor switching element. It is used to control the conduction state of the semiconductor switching element in order to control the power supplied by the switching element to the heating element.

[0034] The detection circuit is electrically connected to the power supply and the heating element respectively, and is used to detect electrical parameters;

[0035] The control unit's signal output terminal is connected to the signal input terminal of the drive element, and the control unit's signal input terminal is connected to the signal output terminal of the detection circuit.

[0036] The control unit is configured to determine the current resistance of the heating element based on the electrical parameters detected by the detection circuit, and then control the output state of the drive element based on the difference between the current resistance and the target resistance to adjust the power supplied to the heating element by the semiconductor switching element. The target resistance is determined based on the heating temperature that the heating element needs to reach during the heating process, the room temperature resistance, and the temperature coefficient of resistance.

[0037] According to another specific embodiment of the present invention, the detection circuit includes: a detection resistor, the first end of which is connected to the first end of the heating element; electrical parameters including a first voltage at the second end of the detection resistor, a second voltage at the second end of the heating element, and a first current flowing through the detection resistor; the control unit is further configured to receive the first voltage, the second voltage, and the first current, and to determine the current resistance of the heating element based on the first voltage, the second voltage, and the first current.

[0038] According to another specific embodiment of the present invention, the detection circuit further includes:

[0039] An operational amplifier is used to amplify the voltage difference across the sensing resistor. The non-inverting input of the operational amplifier is connected to the first terminal of the sensing resistor, and the inverting input of the operational amplifier is connected to the second terminal of the sensing resistor.

[0040] Secondly, embodiments of this utility model disclose a method for testing the contamination of a heating element, wherein the heating element is subjected to a contamination test using the heating element contamination test fixture described in any of the embodiments of the first aspect, including:

[0041] Insert the electrical connector into the terminal block and secure it to connect the heating element to the circuit control unit.

[0042] The smoke chamber assembly is fitted around the heating element and fixed to the housing. Aerosol is inserted into the smoke chamber assembly to generate the product.

[0043] Set the heating temperature curve of the heating element;

[0044] Start the contamination test fixture for the heating element to control the heating element to heat up according to the heating temperature curve;

[0045] The heating element is subjected to at least one of the following experiments: suction test, tensile test, and temperature test; wherein, the suction test is the process of accumulating contaminants on the surface of the heating element during the suction process; the tensile test is the test of the tensile force required when the heating element heats the aerosol-generated product and then the aerosol-generated product is detached from the heating element by the smoke chamber assembly; and the temperature test is the test of the surface temperature of the heating element when it is heating.

[0046] By adopting the above technical solution, this utility model can independently set different heating programs by using a heating element contamination test fixture for testing. The heating element contamination test fixture has a relatively open structure, low cost, and is easy to replace with heating elements with different shapes of heating bodies and electrical connectors. It is also easy to use in conjunction with other testing equipment to conduct different tests on heating elements that have been heated to form aerosol products.

[0047] According to another specific embodiment of this utility model, the heating element has a room temperature resistance and a temperature coefficient of resistance. The contamination test fixture for the heating element includes a power supply. The specific method for controlling the heating element to heat up according to the heating temperature curve is as follows:

[0048] The target resistance that the heating element needs to reach at multiple moments during the heating process is determined based on the target temperature, room temperature resistance, and temperature coefficient of resistance that the heating element needs to reach at multiple moments in the heating temperature curve.

[0049] Detect the resistance of the heating element at the current moment during the heating process;

[0050] Adjust the power supply output to the heating element according to the difference between the current resistance and the target resistance at the current moment, so that the heating element can reach the corresponding target temperature.

[0051] According to another specific embodiment of the present invention, it further includes: after conducting an experiment on the heating element, removing the product generated by the heating aerosol from the housing, disassembling the contaminated heating element, and storing the contaminated heating element.

[0052] According to another specific embodiment of the present invention, before assembling the heating element to the circuit control unit, the method further includes: cleaning the heating element, and / or adjusting the length of the electrical connector of the heating element. Attached Figure Description

[0053] Figure 1 This diagram shows the overall structure of the heating element contamination test fixture in an embodiment of the present invention.

[0054] Figure 2 This diagram illustrates the three-dimensional structure of the heating element contamination test fixture in an embodiment of the present invention. Figure 1 ;

[0055] Figure 3 This invention illustrates the explosion of the heating element contamination test fixture in an embodiment of the present invention. Figure 1 ;

[0056] Figure 4 This invention illustrates the explosion of the heating element contamination test fixture in an embodiment of the present invention. Figure 2 ;

[0057] Figure 5 This shows a bottom view of the smoke-lifting device in an embodiment of the present invention;

[0058] Figure 6 This diagram shows a three-dimensional structural schematic of the smoke lifter in an embodiment of the present invention;

[0059] Figure 7 This diagram shows a partial three-dimensional structure of the outer wall of the housing, the convex ring, and the smoke chamber assembly in an embodiment of the present invention. Figure 1 ;

[0060] Figure 8 This diagram shows a partial three-dimensional structure of the outer wall of the housing, the convex ring, and the smoke chamber assembly in an embodiment of the present invention. Figure 2 ;

[0061] Figure 9 This diagram shows a partial three-dimensional structure of the outer wall of the housing, the convex ring, and the smoke chamber assembly in an embodiment of the present invention. Figure 3 ;

[0062] Figure 10 A three-dimensional structural schematic diagram of the smoke chamber base in an embodiment of this utility model is shown;

[0063] Figure 11 This diagram illustrates the three-dimensional structure of the convex ring and the outer wall of the housing in an embodiment of the present invention. Figure 1 ;

[0064] Figure 12 This diagram shows a three-dimensional structural schematic of the guide groove in an embodiment of the present invention;

[0065] Figure 13 This diagram illustrates the three-dimensional structure of the convex ring and the outer wall of the housing in an embodiment of the present invention. Figure 2 ;

[0066] Figure 14 Show Figure 13 A magnified view of a portion of region B in the middle;

[0067] Figure 15 This is a top view of the heating element contamination test fixture in an embodiment of the present invention;

[0068] Figure 16 Show Figure 15 A magnified view of a portion of region C in the middle;

[0069] Figure 17 An exploded view of the heating element assembly in an embodiment of this utility model is shown;

[0070] Figure 18 A disassembled diagram of the heating element assembly in an embodiment of this utility model is shown;

[0071] Figure 19 This diagram illustrates the three-dimensional structure of the heating element assembly in an embodiment of the present invention. Figure 1 ;

[0072] Figure 20 This diagram illustrates the three-dimensional structure of the heating element assembly in an embodiment of the present invention. Figure 2 ;

[0073] Figure 21 This diagram illustrates the three-dimensional structure of the heating element contamination test fixture in an embodiment of the present invention. Figure 2 ;

[0074] Figure 22 This diagram shows the control interface of the display screen in an embodiment of the present invention.

[0075] Figure 23 A three-dimensional structural schematic diagram of the upper cover is shown in one embodiment of the present invention;

[0076] Figure 24 The image shows a top view of the upper cover in one embodiment of the present invention;

[0077] Figure 25 The image shows a front view of the top cover in one embodiment of the present invention;

[0078] Figure 26 The image shows a left view of the upper cover in one embodiment of the present invention;

[0079] Figure 27 A three-dimensional structural schematic diagram of the lower cover in one embodiment of the present invention is shown;

[0080] Figure 28 A top view of the lower cover is shown in one embodiment of the present invention;

[0081] Figure 29The image shows a front view of the lower cover in one embodiment of the present invention;

[0082] Figure 30 The image shows a left view of the lower cover in one embodiment of the present invention;

[0083] Figure 31 A three-dimensional structural schematic diagram of the first base in an embodiment of this utility model is shown;

[0084] Figure 32 A top view of the first base in an embodiment of this utility model is shown;

[0085] Figure 33 The image shows a front view of the first base in an embodiment of this utility model;

[0086] Figure 34 The left view of the first base in an embodiment of this utility model is shown;

[0087] Figure 35 This diagram shows a structural schematic of the bottom wall in one embodiment of the present invention;

[0088] Figure 36 This diagram illustrates the assembly structure of the heating element and the circuit control unit in yet another embodiment of the present invention.

[0089] Figure 37 A schematic diagram of the power switching circuit in an embodiment of this utility model is shown;

[0090] Figure 38 A schematic diagram of the heating element control circuit in an embodiment of this utility model is shown;

[0091] Figure 39 This diagram shows the structure of the O-ring in an embodiment of the present invention.

[0092] Figure 40 This diagram shows the structure of the suction nozzle in an embodiment of the present invention;

[0093] Figure 41 This is a schematic diagram of the structure of the suction nozzle assembled with an O-ring in an embodiment of the present invention;

[0094] Figure 42 This diagram shows the assembled structure of the heating element fixing base and the porous array chassis in an embodiment of the present invention.

[0095] Figure 43 This diagram illustrates the assembly process of the heating element fixing base and the porous array chassis in an embodiment of the present invention.

[0096] Figure 44 This shows an exploded view of the heating element assembly formed by assembling the upper cover and the lower cover in an embodiment of the present invention.

[0097] Figure 45 This is a schematic diagram of the structure of the heating element assembly formed by assembling the upper cover and the lower cover in an embodiment of the present invention;

[0098] Figure 46 This is a schematic diagram of the structure of the heating element assembly formed by assembling the first base in an embodiment of the present invention;

[0099] Figure 47 An exploded view of the heating element assembly formed by assembling the first base in an embodiment of this utility model is shown.

[0100] Symbol Explanation: 1. Heating element contamination test fixture; 2. Housing; 21. Outer wall of housing; 22. Protruding ring; 23. Guide groove; 231. Axial guide groove; 232. Circumferential locking groove; 3. Cover; 4. Heating element assembly; 41. Heating element; 42. Electrical connector; 43. Flange seat; 44. Upper cover; 45. Lower cover; 46. High-temperature resistant silicone ring; 47. High-temperature resistant silicone gasket; 48. First screw; 49. First base; 491. Base screw hole; 492. Heating element fixing base; 494. Second screw; 495. Second base. 495; Smoke chamber assembly 5; Non-elastic traction rope 51; Chamber 52; Smoke lifter 53; Top shell 54; Perforation 55; Smoke chamber base 57; Protrusion 58; Bottom wall 59; First perforation 591; Second perforation 592; Circuit control unit 6; Wiring terminal 61; Plug-in wiring terminal 611; Control circuit 62; Power supply 7; External device 8; Display screen 9; Control button 91; O-ring 10; Nozzle 11; Chassis 12; Fixed base 13; Pin 131; Axial direction X; Circumferential direction Y. Detailed Implementation

[0101] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0102] 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.

[0103] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0104] The term "aerosol-generating article" includes materials that provide volatile components when heated, and may include any tobacco-containing material, such as one or more of tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, or tobacco substitutes. "Aerosol-generating article" may also include other non-tobacco products that may or may not contain nicotine.

[0105] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0106] Firstly, reference Figures 1-4 and combined Figures 17-20 This utility model discloses a contamination testing fixture 1 for a heating element, comprising: a housing 2, with an opening on the outer side wall 21 of the housing 2; a heating element, detachably connected to the housing 2, comprising: a heating element 41 located outside the housing 2; and an electrical connector 42 located at the tail end of the heating element 41, extending from the outside into the opening and into the interior of the housing 2; and a smoke chamber assembly 5, sleeved on the outer periphery of the heating element and detachably connected to the housing 2, for accommodating aerosol-generating products; wherein the smoke chamber assembly 5 can be positioned along the axial direction of the heating element (e.g., ...). Figure 3 and Figure 4 The aerosol-generating product moves away from the heating element in the X direction (as shown) to detach it from the heating element. A circuit control unit 6, located within the housing 2, controls the power supply to the heating element to heat the aerosol-generating product and detects the electrical parameters of the heating element during the heating process. The circuit control unit 6 includes a terminal block 61, detachably electrically connected to an electrical connector 42.

[0107] The heating element contamination test fixture 1 also includes a power supply for supplying power to the heating element. The circuit control unit 6 specifically controls the power supply process to the heating element, such as adjusting the current output of the power supply.

[0108] Through the above technical solution, the heating element contamination testing fixture 1 of this utility model has a relatively open structure and low cost. The heating element and the circuit control unit 6 are detachably connected through the wiring terminal 61, which also facilitates the replacement of heating elements with different shapes of heating bodies 41 and electrical connectors 42. In addition, the circuit control unit 6 can control the power supply process to the heating element, wherein different heating programs can be set to heat the cigarette or tobacco material to conduct a contamination test. The structure of the heating element contamination testing fixture 1 also facilitates its use in conjunction with other testing equipment to conduct different tests on heating elements that have been heated to produce aerosol products (which can be understood as contaminated heating elements), such as using it with a smoking machine for a smoking experiment, using it with an infrared thermometer for temperature measurement, and using it with a tensile tester for pull-out force testing.

[0109] Furthermore, in the above embodiments, reference is made to... Figures 7-14 The heating element contamination test fixture 1 further includes: a convex ring 22, disposed on the outer side wall 21 of the housing 2 and surrounding the opening, extending in a direction away from the outer side wall 21 of the housing 2; and a guide groove 23, disposed on the inner peripheral wall of the convex ring 22, the guide groove 23 including: an axial guide groove 231, along the axial direction of the convex ring 22 (e.g., along the axial direction of the convex ring 22). Figure 3 and Figure 4 The axial direction (X) of the guide groove 231 extends; the circumferential locking groove 232 extends from one end of the axial guide groove 231 along the circumferential direction of the protruding ring 22 (e.g., along the X-axis); the circumferential locking groove 232 extends from one end of the axial guide groove 231 along the circumferential direction of the protruding ring 22. Figure 3 and Figure 4 The smoke chamber assembly 5 extends circumferentially (Y) and communicates with the axial guide groove 231. The smoke chamber assembly 5 includes: a smoke chamber body for accommodating aerosol-generating products; and a smoke chamber base 57 located at the end of the smoke chamber body, the outer peripheral wall of which has an outwardly protruding protrusion 58. The protrusion 58 can slide into the axial guide groove 231 along the axial direction of the protruding ring 22, and then rotate circumferentially along the protruding ring 22 to engage with the protruding ring 22; the protrusion 58 can also rotate circumferentially along the protruding ring 22 to slide out of the circumferential locking groove 232, and then slide out of the axial guide groove 231 along the axial direction of the protruding ring 22 to disengage the smoke chamber assembly 5 from the protruding ring 22.

[0110] In this manner, the smoke chamber assembly 5 is fixed to the protruding ring 22 by a rotating snap-fit, which is convenient for assembly and disassembly. It not only fixes the heating element but also helps to position the heating element 41 body of the heating element at the center position of the smoke chamber assembly 5. In addition, the smoke chamber assembly has a smoke chamber base 57, which can limit the axial movement of the heating element.

[0111] Further, in the above embodiments, the smoke chamber body includes a chamber 52 and a smoke lifter 53. The smoke lifter 53 includes: a receiving cavity for receiving the aerosol-generating product; a smoke lifter shell, which is sleeved on the outer periphery of the chamber 52 and detachably connected to the chamber 52. The smoke lifter shell includes a top shell 54, which is located at the top of the receiving cavity and fixedly connected to the receiving cavity, and has an opening for inserting the aerosol-generating product and a correspondingly arranged through hole 55; a non-elastic traction rope 51, whose two ends are respectively inserted into the through hole 55 to be fixedly connected to the top shell 54 to form a handle. The non-elastic traction rope 51 is pulled axially away from the chamber 52 to lift the smoke lifter 53 from the chamber 52, thereby causing the aerosol-generating product to detach from the heating element.

[0112] In the above technical solution, the cigarette holder 53 serves to support and load the cigarette or tobacco material. When the cigarette holder 53 is pulled out, it ensures that the cigarette or tobacco material is separated from the heating element 41 as a whole. The cigarette holder 53 is also designed with holes (and hooks in other embodiments), etc., so that it can be connected to a force measuring device (such as a dynamometer) through a soft but inelastic rope to conduct a pull-out force test, which is convenient.

[0113] Furthermore, the non-elastic traction rope 51 can be a steel wire rope, more specifically a steel wire rope with a diameter of 0.4 mm, which helps to ensure the accuracy of the test results obtained from the tensile test.

[0114] Furthermore, in the above embodiments, reference is made to... Figure 5 and Figure 6 The receiving cavity has a bottom wall 59, and the smoke lifter 53 further includes: a first through hole 591 located in the center of the bottom wall 59 for the heating element to pass through; and multiple second through holes 592 located in the bottom wall 59 and distributed around the first through hole 591 to allow airflow. This arrangement can simulate the usage environment of the heating element in a smoking device, thereby helping to ensure that the test results are consistent with the actual usage of the heating element in a smoking device.

[0115] In the above embodiments, the heating element 41 in the heating element can be a needle-shaped, cylindrical, or plate-shaped heating element. The heating element generally includes a heating element body (i.e., heating element 41), leads (i.e., electrical connectors 42), and a flange (i.e., flange seat 43). The heating element may also be provided with soldering points. The heating element can be connected to the circuit control system (i.e., circuit control unit 6) through the leads.

[0116] For example, refer to Figures 17-20The heating element also includes a flange seat 43, fixed to the tail end of the heating element 41, and an electrical connector 42 located at the bottom of the flange seat 43. The heating element contamination test fixture 1 also includes a heating element fixing assembly. The heating element and the heating element fixing assembly can form a heating element assembly 4. The heating element fixing assembly includes an upper cover 44 with a heating element through-hole; a lower cover 45 with an electrical connector through-hole. The lower cover 45 and the upper cover 44 form a cavity, with the flange seat 43 located within the cavity. The heating element 41 protrudes through the heating element through-hole, and the electrical connector 42 protrudes through the electrical connector through-hole. This arrangement allows for a more secure installation of the heating element 41 and the electrical connector 42, ensuring that the position of the heating element 41 remains fixed during the test.

[0117] Furthermore, the upper cover 44 is provided with a first screw hole, and the lower cover 45 is provided with a second screw hole opposite to the first screw hole. The heating element also includes a first screw 48, which passes through the first screw hole and the second screw hole in sequence to fix the upper cover 44 and the lower cover 45 together. This arrangement facilitates the disassembly and assembly of the upper cover 44 and the lower cover 45, thereby allowing for convenient replacement of the heating element assembled from the heating element 41, the flange seat 43, and the electrical connector 42. The first screw 48 can be, for example, an M1.2X3 round head Phillips screw, and both the upper cover 44 and the lower cover 45 can be made of PEEK material.

[0118] Furthermore, in the above embodiments, the cavity formed by the upper cover 44 and the lower cover 45 is also filled with a high-temperature resistant sealing element. Specifically, the high-temperature resistant sealing element can be a high-temperature resistant silicone gasket 47, which can achieve a sealed connection and improve the reliability of the heating element. Furthermore, a high-temperature resistant silicone ring 46 can also be fitted around the outer periphery of the lower cover 45, thereby further protecting and sealing the heating element and further improving the reliability of the heating element.

[0119] Furthermore, in the above embodiments, the tobacco chamber base 57, the upper cover 44, and the lower cover 45 can work together to perform the function of the base, so that when the cigarette or tobacco material is pulled out, the connection point between the electrical connector 42 of the heating element and the circuit control unit 6 does not undergo significant relative displacement, thereby improving the overall reliability and the accuracy of the tensile test results.

[0120] In another embodiment, for a needle-type, cylindrical heating element with a square flange, the structure of the heating element fixing assembly cover 44 is designed as follows: Figures 23-26 As shown, the lower cover 45 structure is as follows Figures 27-30 As shown. A square flange can be located within the space enclosed by the upper cover 44 and the lower cover 45. The columnar heating element can pass through the perforation in the center of the upper cover 44 and extend into the receiving cavity that holds the cigarette. After the upper cover 44, lower cover 45, and heating element 41 are assembled, the resulting heating element is as shown... Figure 44 and Figure 45 As shown. In this embodiment, during assembly Figure 44 and Figure 45 When the heating element is shown, the high-temperature resistant silicone ring 46 and the high-temperature resistant silicone gasket 47, which play a protective sealing and auxiliary fixing role, and the first screw 48 can be used or not used as needed.

[0121] In yet another embodiment, reference is made to... Figures 31-34 and combined Figures 46-47 The heating element fixing assembly also includes: a first base 49; and a second base 495 (which has the same structure as the first base 49), which is disposed opposite to the first base 49. A slot space is formed between the opposite side walls of the first base 49 and the second base 495, and the heating element 41 is engaged in the slot space. The first base 49 is also provided with a base screw hole 491, and the second base 495 is also provided with a corresponding screw hole. The first base 49 and the second base 495 can be fixedly connected by a second screw 494.

[0122] Specifically, for flangeless sheet heating elements, the heating element fixing assembly is designed as two identical semi-cylindrical structures (i.e., the first base 49 and the second base). The material of the first base 49 and the second base 495 of the semi-cylindrical structures can be selected according to the operating temperature, such as PEEK, PI, ceramic, etc. The contact surface with the sheet heating element can be selected from PI gaskets, asbestos gaskets, etc., which can play a role in buffering, insulation, and high temperature resistance. The corresponding bottom wall 59 of the smoke lifter 53 ( Figure 35 The bottom structure supporting the cigarette is designed as a rectangular hollow structure, namely the first perforation 591, so that the sheet-like heating element can pass through.

[0123] In this embodiment, the heating element 41 is a sheet-shaped heating element. In other embodiments, the heating element 41 can also be a cylindrical heating element, as long as the cylindrical heating element can be engaged in the slot space formed between the opposing side walls of the first base 49 and the second base 495.

[0124] Furthermore, the circuit connection between the circuit control unit 6 and the heating element can be made in a way that facilitates disassembly and assembly, such as plug-in terminals, push-button terminals, screw-fixed terminals, etc.

[0125] Specifically, in the above embodiments, reference is made to Figure 15 and Figure 16 The terminal block is a screw-fixed terminal block, comprising: a wire channel for accommodating electrical connectors; and a screw channel, perpendicular to and communicating with the wire channel, for accommodating screws. The screw passes through the screw channel to press and fix the electrical connector 42 within the wire channel; when the screw exits the screw channel, the pressure on the electrical connector 42 is released, allowing the electrical connector 42 to be removed from the wire channel. This design facilitates the overall replacement and disassembly of the heating element and is adaptable to different structures of the electrical connector 42 and the heating element 41.

[0126] In this embodiment, a metal plate may also be provided inside the screw-fixed terminal block. After the screw is inserted into the screw channel, the screw first presses against the metal plate, and then the metal plate presses the electrical connector 42 tightly. In the screw-fixed terminal block, the method of pressing the electrical connector 42 with the screw is not limited to this; it is sufficient as long as the electrical connector 42 can be fixed in the wire channel.

[0127] Furthermore, there are multiple electrical connectors 42, wire channels, and screw channels. Different electrical connectors 42 are inserted into different wire channels and fixed in their respective wire channels by different screws. That is, the wire channels and screw channels correspond one-to-one (each wire channel is equipped with a screw channel that is perpendicularly connected to it). At the same time, there are also multiple electrical connectors 42 for the heating element. Each electrical connector 42 is inserted into an independent wire channel and then pressed and fixed in the wire channel by a screw in the corresponding screw channel. In a more specific embodiment, the heating element has, for example, two electrical connectors 42 (i.e., the heating element has two leads, for example, referred to as the first lead and the second lead). In this case, a screw-fixed terminal block with two screw channels (for example, referred to as the first screw channel and the second screw channel respectively) and two wire channels (for example, referred to as the first wire channel and the second wire channel respectively) can be used. The first screw channel is connected to the first wire channel, and the second screw channel is connected to the second wire channel. At this point, the first lead can be inserted into the first wire channel, and the screw can be inserted into the first screw channel to press and fix the first lead within the first wire channel; the second lead can be inserted into the second wire channel, and another screw can be inserted into the second screw channel to press and fix the second lead within the second wire channel. This arrangement allows each electrical connector 42 to be in an independent installation space, preventing direct contact between different electrical connectors 42, thereby improving the safety and reliability of the circuit. Furthermore, the electrical connector 42 is a lead with a length of 20-22 mm.

[0128] Furthermore, in the above embodiments, reference is made to... Figure 3 and Figure 4 The top wall of the housing 2 is provided with a wiring opening. The heating element contamination test fixture 1 also includes a cover 3, which covers the wiring opening and is detachably connected to the housing 2. When the cover 3 is separated from the housing 2, the entrance to the screw channel is exposed, allowing screws to pass through or out of the screw channel. With this design, when replacing the heating element, only the cover 3 needs to be opened to remove and install the heating element, making the process convenient and quick.

[0129] In another specific embodiment, reference is made to... Figure 36The terminal block 61 is a pluggable terminal block 611, which includes: a first connector, fixedly connected to the circuit control unit 6; and a second connector, fixedly connected to the electrical connector 42. The first and second connectors are pluggable, and the electrical connector 42 can be electrically connected to or disconnected from the circuit control unit 6 by plugging and unplugging the first and second connectors.

[0130] More specifically, the pluggable terminal block 611 has a male and a female connector. The first connector can be male, in which case the second connector is female; or, the first connector can be female, in which case the second connector is male. Using the pluggable terminal block 611 to connect the electrical connector 42 (e.g., lead wire) of the heating element and the circuit control unit 6 makes the installation and removal of the heating element easier and also improves the success rate of circuit connection.

[0131] In this embodiment, one of the connectors (e.g., the second connector) of the heating element assembly 4, the heating element mounting base 492, and the pluggable terminal block 611 can be pre-assembled into a whole. The other connector (e.g., the first connector) of the pluggable terminal block 611 can be pre-assembled into a whole with the control circuit 62 of the circuit control unit 6. The heating element and the control circuit 62 of the circuit control unit 6 are then electrically connected or disconnected through the pluggable terminal block 611. Specifically, the heating element is fixed on the heating element mounting base 492, and the electrical connector 42 is connected to the second connector of the pluggable terminal block 611. The connection and disconnection of the heating element and the circuit control unit 6 are achieved by mutually plugging and unplugging the first and second connectors of the pluggable terminal block 611. In this embodiment, the heating element mounting base 492 can be considered as the whole formed by the outer wall 21, the protruding ring 22, and the chamber 52 of the housing. The heating element mounting base 492 is used to fix the heating element.

[0132] In another specific embodiment, the terminal 61 is a push-button terminal, which includes: a terminal body; a pressing operation part disposed at the upper end of the terminal body; and a wire clamping mechanism disposed inside the terminal body and drivingly cooperating with the pressing operation part for clamping the electrical connector. The wire clamping mechanism can be switched between an open state and a closed state by pressing or releasing the pressing operation part. In the open state, the electrical connector 42 (e.g., a lead wire) can extend into or out of the wire clamping mechanism; in the closed state, the wire clamping mechanism can clamp the electrical connector 42 that has extended into the wire clamping mechanism. By using a push-button terminal, the heating element can be more easily disassembled or assembled to the circuit control unit 6.

[0133] Furthermore, in other embodiments, such as Figure 42 and Figure 43As shown, the fixing base 13 of the heating element (wherein the fixing base 13 is provided with a protruding ring 22) can be fixed separately and does not need to be fixed together with the control circuit system of the heating element contamination test fixture 1. In terms of structural implementation, the bottom of the fixing base 13 can be provided with at least one pin 131 (in this embodiment, there are two pins 131), and the pins 131 can be inserted into the corresponding holes in the chassis 12 (for example, a multi-hole array chassis), so that the fixing base 13 can be installed on the fixed chassis 12 in a plug-and-play manner.

[0134] Furthermore, in the above embodiments, the heating element contamination test fixture 1 also includes a power supply 7. The power supply 7 is electrically connected to the circuit control unit 6 and is used to supply power to the circuit control unit. The power supply 7 can be a rechargeable power supply located inside the housing 2, or it can be an external power supply. Exemplarily, the power supply 7 can use a constant voltage DC power supply, a rechargeable battery, or a disposable battery, and different power supply methods can be distinguished by a switch on the housing 2 (see reference). Figure 2 The switching is performed, and its circuit diagram is publicly available as follows: Figure 37 . Figure 37 In this context, VBAT represents the power supply inside casing 2, V2 represents the external power supply, and VOUT represents the output voltage.

[0135] Furthermore, in the above embodiments, the heating element has a room-temperature resistance (room-temperature resistance can be understood as the resistance value of the heating element at room temperature, for example, 25°C) and a temperature coefficient of resistance. Reference Figure 38 The circuit control unit 6 also includes: semiconductor switching elements, driving elements, detection circuits and control units.

[0136] The power transmission terminal of the semiconductor switching element is connected to the heating element (i.e., P5), and outputs power to the heating element. In this embodiment, the semiconductor switching element is PB521BX, the power transmission terminal is the drain D of the semiconductor switching element, and the source S of the semiconductor switching element is connected to the positive terminal B+ of the power supply.

[0137] The output terminal of the driving element is connected to the signal input terminal (i.e., gate G) of the semiconductor switching element, and is used to control the conduction state of the semiconductor switching element (wherein, the control signal can be input through the OUT_EN port) to control the power supplied by the semiconductor switching element to the heating element. In this embodiment, the driving element is a field-effect transistor (MOSFET) (i.e., Q3), specifically model CJAA3134K.

[0138] The detection circuit is electrically connected to the power supply 7 and the heating element respectively, and is used to detect electrical parameters.

[0139] The signal output terminal of the control unit is connected to the signal input terminal of the drive element, and the signal input terminal of the control unit is connected to the signal output terminal of the detection circuit. The control unit is configured to determine the current resistance of the heating element based on the electrical parameters detected by the detection circuit, and then control the output state of the drive element based on the difference between the current resistance and the target resistance to adjust the current supplied to the heating element by the semiconductor switching element. The target resistance is determined based on the heating temperature that the heating element needs to reach during the heating process, the room temperature resistance, and the temperature coefficient of resistance.

[0140] The circuit structure described above, through the coordinated operation of the control unit, driving element, semiconductor switching element, and detection circuit, achieves high-precision closed-loop temperature control based on the resistance-temperature characteristics of the heating element itself. It can convert the set target temperature into a quantifiable target resistance. Combined with the current resistance obtained in real time by the detection circuit, the driving element dynamically adjusts the conduction state of the semiconductor switching element, thereby precisely controlling the power supplied to the heating element and ensuring that the heating process strictly follows the preset temperature curve. This design not only simplifies the hardware structure and reduces costs, but also improves control accuracy, stability, and reliability, while possessing good versatility and scalability.

[0141] Furthermore, in the above circuit, a PB521BX is used as a semiconductor switching element, with its drain (D) connected to the heating element and its source (S) connected to the positive power supply to achieve stable power transmission. A CJAA3134K field-effect transistor is used as the driving element. The low gate threshold voltage characteristic of the CJAA3134K can directly adapt to the signal output of the control unit, allowing stable control of the PB521BX's conduction state without additional level conversion circuitry. This simplifies the circuit architecture while reducing hardware costs and assembly difficulty. The control unit determines the target resistance based on the heating element's room temperature resistance, resistance temperature coefficient, and target temperature. Combined with the electrical parameters obtained from the detection circuit, it calculates the current resistance, forming a closed-loop control that precisely adjusts the power supplied to the heating element by the semiconductor switching element, ensuring that the heating element strictly adheres to the set temperature for heating. Moreover, the selection of each component considers both power transmission requirements (PB521BX) and compact design (CJAA3134K small package), adapting to the space constraints and functional requirements of the heating element contamination test fixture 1, effectively improving the overall circuit's stability, accuracy, and practicality.

[0142] Further reference Figure 38In the above embodiments, the detection circuit includes a detection resistor (R19), with its first end connected to the first end of the heating element. Electrical parameters include a first voltage at the second end of the detection resistor and a second voltage at the second end of the heating element, which can be output via the OUT_FB port. The first current flowing through the detection resistor is acquired via a differential acquisition network R17, R19, R20 and the MCU's internal OP (operational amplifier module). The control unit is also configured to receive the first voltage, the second voltage, and the first current, and determine the current resistance of the heating element based on these parameters. This method improves the accuracy of electrical parameter detection and enhances the accuracy and stability of calculating the current resistance of the heating element.

[0143] Furthermore, in the above embodiments, the detection circuit further includes: an operational amplifier, the non-inverting input terminal (i.e., OP1_P) of the operational amplifier is connected to the first end of the detection resistor, and the inverting input terminal (i.e., OP1_N) of the operational amplifier is connected to the second end of the detection resistor, which is used to amplify the voltage difference across the detection resistor, thereby significantly improving the signal amplitude and signal-to-noise ratio, so as to more accurately acquire the voltage signal on the detection resistor, thereby calculating a more accurate first current and the current resistance of the heating element.

[0144] Furthermore, the heating element contamination test fixture 1 provided by this utility model can export the monitored heating element circuit parameters (i.e., the above-mentioned electrical parameters) and theoretical temperature.

[0145] The circuit control unit 6 can monitor the electrical parameters of the heating element to obtain the theoretical temperature, and then control the heating element to heat at different power levels through the control circuit, thereby reaching the set temperature at different heating rates. The temperature setting range can be no less than 100℃~450℃. Specifically, the circuit control unit 6 has the function of adjusting the temperature based on the resistance (R0) and temperature coefficient of resistance (TCR) of the heating element. Its temperature control principle is as follows: the circuit control unit 6 measures the resistance of the heating element, calculates the theoretical temperature based on the TCR, compares it with the set temperature, and adjusts the current supplied to the heating element to control the heating power of the heating element.

[0146] Furthermore, in other embodiments, thermocouples can be pre-embedded in the circuit control unit 6 to directly detect the temperature of the heating element during the heating process. Subsequently, the measured temperature can be compared with the set temperature to adjust the current supplied to the heating element and control the heating power of the heating element.

[0147] In another specific embodiment, the heating element contamination test fixture 1 can monitor the electrical parameters of the heating element, obtain the real-time resistance value, and then compare it with the theoretical target resistance value. The control circuit then controls the heating element to heat at different power levels, thereby achieving the set temperature at different heating rates. The temperature setting range is also no less than 100℃~450℃. The circuit control unit 6 adjusts the temperature based on the heating element resistance (R0) and temperature coefficient of resistance (TCR). Its temperature control principle is as follows: the target resistance value of the heating element is calculated based on the set temperature, TCR, and R0. The circuit control unit 6 measures the resistance of the heating element and, after comparing it with the target resistance value, adjusts the current supplied to the heating element to control the heating power of the heating element.

[0148] Furthermore, the circuit control unit 6 can be connected via a signal output port ( Figure 2 It can export the circuit parameters during the working process to an external device (such as a personal computer) in real time.

[0149] When setting the heating temperature curve of the heating element, multiple stages of programmed heating can be included (see...). Figure 21 and Figure 22 Display screen 9 can display Figure 22 The interface allows users to set different parameters via control button 91.

[0150] Secondly, embodiments of this utility model disclose a method for testing the contamination of a heating element, wherein the heating element is subjected to a contamination test using the heating element contamination test fixture 1 in any of the embodiments of the first aspect described above, including:

[0151] S1: Insert the electrical connector into the terminal block and secure it to make the heating element electrically connected to the circuit control unit.

[0152] Specifically, each component, such as Figure 3 and Figure 4 As shown, loosen the screws on the wiring terminal 61 (taking screw-fixed wiring terminal as an example) of the circuit control unit 6 in the heating element contamination test fixture 1, and install the assembled heating element into the housing 2. Insert the electrical connectors 42 of the heating element into different grooves (i.e. wire channels) of the wiring terminal 61 respectively. After installation, pay attention to the state of the electrical connectors 42. When the electrical connectors 42 are leads, different leads should not cross contact. Finally, tighten the screws on the wiring terminal 61 to complete the assembly of the heating element.

[0153] S2: The smoke chamber assembly is fitted around the heating element and fixed to the housing. Aerosol is inserted into the smoke chamber assembly to generate the product. Specifically, the smoke chamber base 57 can be rotated and snapped into the protruding ring 22 on the housing 2 for fixation. The cover 3 is then placed on top, and the smoke lifter 53 is installed onto the chamber 52 to complete the assembly of the contamination test fixture.

[0154] S3: Set the heating temperature curve of the heating element.

[0155] Specifically, the room temperature resistance R0 and temperature coefficient of resistance TCR of the heating element can be set in the heating element contamination test fixture 1. A temperature control program (i.e., the heating temperature curve of the heating element) can also be set according to experimental needs. See the setup instructions below. Figure 22 .

[0156] Furthermore, in order to ensure that the actual heating temperature of the heating element is consistent with the set heating temperature curve, other temperature measuring instruments can be used for temperature calibration.

[0157] After setting the heating temperature profile of the heating element, and before starting the contamination test fixture for the heating element (i.e., after step S3 and before step S4), the following steps are also included:

[0158] The temperature of the heating element is calibrated in the following way:

[0159] The heating element is controlled to generate heat according to the heating temperature curve, and the actual heating temperature of the heating element at multiple moments is measured (the temperature can be measured by other temperature measuring instruments).

[0160] If the difference between the actual heating temperature and the target required temperature at the corresponding moment in the heating temperature curve exceeds the preset error range (which can be understood as the experimentally allowed error range, and can be adjusted according to actual needs), then the temperature control parameters of the heating element are adjusted until the difference between the actual heating temperature and the target required temperature is within the preset error range; otherwise, the temperature control parameters of the heating element are not adjusted, thus completing the temperature calibration.

[0161] Among them, the temperature control parameter can be, for example, the temperature coefficient of resistance of the heating element. In this case, the specific adjustment method can be to adjust the preset temperature coefficient of resistance TCR in the heating element contamination test fixture 1. The temperature control parameter can also refer to the target required temperature in the preset heating temperature curve. In this case, the specific adjustment method can be to adjust the target required temperature so that the target required temperature in the heating temperature curve is closer to the actual heating temperature that the heating element can achieve.

[0162] S4: Start the contamination test fixture for the heating element to control the heating element to generate heat according to the heating temperature curve.

[0163] S5: Perform at least one of the following experiments on the heating element: suction test, tensile test, and temperature test; wherein, the suction test is the process of accumulating contaminants on the surface of the heating element during the suction process (i.e., simulating the process of a user smoking); the tensile test is to detect the tensile force required when the heating element heats the aerosol-generated product and then the aerosol-generated product is detached from the heating element by the smoke chamber assembly; the temperature test is to detect the surface temperature of the heating element when it is heating.

[0164] The above-mentioned contamination test method for heating elements can be used to test either already contaminated heating elements or uncontaminated heating elements. When the heating element is already contaminated, the suction test can be performed or not; when the heating element is not yet contaminated, the suction test can be performed first to allow contaminants to accumulate on the surface of the heating element, and then other tests (such as tensile tests and temperature tests) can be performed.

[0165] By adopting the above technical solution, this utility model can independently set different heating programs by using the heating element contamination test fixture 1 for testing. The heating element contamination test fixture has a relatively open structure, low cost, and is easy to replace with heating elements with different shapes of heating bodies and electrical connectors. It is also easy to use in conjunction with other testing equipment to conduct different tests on heating elements that have been heated to form aerosol products.

[0166] Furthermore, in the smoking experiment, a smoking machine can be used. The smoking parameters of the smoking machine can be set according to the experimental needs. A heated cigarette can be inserted into the cigarette holder 53 of the heating element contamination test fixture 1, or tobacco material can be filled into the cigarette holder 53 (and then a mouthpiece can be installed; the mouthpiece design drawing is shown in...). Figures 39-41 An O-ring 10 can be fitted onto the outside of the suction nozzle 11. Figure 39 Showing the notched O-ring 10, Figure 4-40 Showing nozzle 10 without O-ring 11, Figure 41 The nozzle 11 is shown after the O-ring 10 is installed. The heating element contamination test fixture 1 is started to begin the suction test. Multiple suction tests can be performed as needed.

[0167] Furthermore, the heating element contamination test fixture 1 is connected to the computer (i.e., external device) using a data cable. The serial port debugging assistant software is used to read real-time data such as voltage, current, resistance, and theoretical temperature. After the heating element contamination test fixture 1 is started, it will automatically save a file containing the above data locally, thereby allowing the circuit parameters of the heating element during the heating process to be exported.

[0168] Furthermore, in the tensile test, after the aerosol-generating product is drawn in, the heating element contamination test fixture 1 and the aerosol-generating product can be removed from the smoking machine as a whole, ensuring that there is no significant relative displacement between the aerosol-generating product and the test fixture. Subsequently, the heating element contamination test fixture 1 is fixed, and the non-elastic traction rope 51 on the smoke lifter 53 is pulled at a constant speed using a tensile gauge to test the force required to pull the smoke lifter 53 out of the chamber 52. The aerosol-generating product is located in the receiving cavity of the smoke lifter 53 and can be pulled out together with the smoke lifter 53, detaching from the chamber 52.

[0169] Furthermore, during the temperature test, the smoke extractor 53 and the smoke chamber body are removed from the heating element contamination test fixture 1, so that the heating element is fully exposed. The heating element contamination test fixture 1 is activated, and the surface temperature of the heating element is tested using temperature testing equipment (such as an infrared thermometer, a thermocouple thermometer, etc.).

[0170] Further, in the above embodiments, the heating element has a room-temperature resistance R0 and a temperature coefficient of resistance TCR. The heating element contamination test fixture includes a power supply. The specific method for controlling the heating element to heat up according to the heating temperature curve is as follows: Based on the target temperature, room-temperature resistance, and temperature coefficient of resistance that the heating element needs to reach at multiple moments in the heating temperature curve, determine the target resistance that the heating element needs to reach at multiple moments during the heating process; detect the resistance of the heating element at the current moment during the heating process (i.e., the current resistance); adjust the power supply output to the heating element according to the difference between the current resistance and the target resistance corresponding to the current moment (specifically, the target resistance corresponding to the target temperature that the heating element needs to reach at the current moment), so that the heating element reaches the corresponding target temperature. This can be achieved through... Figure 38 The heating element control circuit shown implements heating control of the heating element. The target temperature can be understood as the temperature in the set heating temperature curve (e.g., the heating temperature curve after temperature calibration).

[0171] Using the above method, based on the inherent room-temperature resistance R0 and temperature coefficient of resistance TCR of the heating element, the target temperature at each moment in the heating temperature curve is accurately converted into a quantifiable and measurable target resistance. Simultaneously, a real-time closed-loop regulation is formed, which can quickly respond to temperature deviations of the heating element during the heating process and correct the power output in real time to align the current resistance with the target resistance, ensuring that the heating element strictly follows the set heating temperature curve throughout the entire test. Furthermore, the above method is adaptable to heating elements of different specifications (only requiring updates to the corresponding R0 and TCR), demonstrating good versatility.

[0172] Furthermore, in the above embodiments, the method for testing the contamination of the heating element further includes: after testing the heating element, removing the product generated by the heating aerosol from the housing, disassembling the contaminated heating element, and storing the contaminated heating element.

[0173] For example, after an experiment (such as one or more of the following: aspiration test, required temperature test, pull-out force test, etc.), once the temperature of the heating element has dropped to near room temperature, the contaminated heating element can be removed and stored in a resealable bag for later use. When further testing is required, it can be directly removed without reheating the aerosol to generate the product, allowing for testing of the contaminated heating element. The testing process is simple and convenient.

[0174] Furthermore, in the above embodiments, before assembling the heating element to be tested into the housing (specifically, before assembling the heating element into the circuit control unit), the method further includes: cleaning the heating element, and / or adjusting the length of the electrical connector of the heating element.

[0175] Specifically, before testing, preparation work can be done on the heating element. For example, depending on the level of contamination, the heating element can be cleaned with water, ethanol, or lint-free paper. In addition, the length of the electrical connectors (e.g., leads) of the heating element can be adjusted according to the structure of the heating element contamination test fixture, such as the structure of the wiring terminals, to make the heating element more compatible with the wiring terminals.

[0176] Furthermore, in the above embodiments, the heating element can be assembled before testing. Figure 17 and Figure 18 Taking the heating element shown as an example, during assembly, the heating element 41 is inserted into the upper cover 44, and the ceramic heating needle base (i.e., flange seat 43) is flush with the bottom surface of the upper cover 44. The high-temperature resistant silicone gasket 47 is then inserted along the heating element lead (i.e., electrical connector 42) and pressed into the inner groove of the upper cover 44, with the high-temperature resistant silicone gasket 47 flush with the bottom surface of the upper cover 44. The lower cover 45 is then assembled with the aforementioned components, allowing the heating element lead to pass through the two small holes on the lower cover 45. The screw holes of the upper cover 44 and lower cover 45 are aligned, and screws are used for tightening. Subsequently, the high-temperature resistant silicone ring 46 is placed on the assembled components, ensuring the three positioning slots are aligned and wrapped, thus completing the assembly of the heating element. The above-described heating element assembly is convenient. Furthermore, other types of heating elements can be replaced. Before testing, a pre-assembled heating element can be used, or some components of the heating element (such as the heating element 41 and electrical connector 42) can be replaced and the heating element reassembled.

[0177] In the above embodiments, this utility model provides a heating element contamination test fixture 1 and a test method, which can be used to study and test the basic performance of the heating element after it becomes contaminated when heating cigarettes. It can also prepare and store heating elements with different degrees of contamination for subsequent testing. This utility model has the advantages of being inexpensive and highly versatile. The inexpensive heating element contamination test fixture 1 provided by this utility model is reflected in its reusability; when obtaining heating elements with different levels of contamination, only the heating element needs to be replaced without damaging the heating element contamination test fixture. Its versatility is reflected in the ability to easily replace different heating elements, to set and control the heating element to heat at different temperatures, and to connect to a smoking machine for smoking experiments when unloaded or loaded with cigarettes or tobacco materials. It can also monitor the circuit parameters and theoretical temperature of the heating element, facilitating its use in conjunction with temperature testing, tensile testing, and other related testing instruments.

[0178] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A testing fixture for contamination of heating elements, characterized in that, include: A housing, wherein an opening is provided on the outer side wall of the housing; A heating element, detachably connected to the housing, includes: The heating element is located outside the housing; An electrical connector is located at the tail end of the heating element, passes through the opening from the outside in, and extends into the interior of the housing; A smoke chamber assembly is fitted around the outer periphery of the heating element and is detachably connected to the housing for accommodating the aerosol-generating product; wherein, the smoke chamber assembly can move along the axial direction away from the heating element to drive the aerosol-generating product to detach entirely from the heating element; A circuit control unit, disposed within the housing, is used to control the power supply process to the heating element so that the heating element heats the aerosol-generating product, and to detect the electrical parameters of the heating element during the heating process, including: The wiring terminal is detachably electrically connected to the electrical connector.

2. The heating element contamination test fixture as described in claim 1, characterized in that, Also includes: A convex ring is provided on the outer side wall of the housing and surrounds the opening, extending in a direction away from the outer side wall of the housing; A guide groove is provided on the inner peripheral wall of the convex ring, the guide groove comprising: An axial guide groove extends along the axial direction of the convex ring; A circumferential locking groove extends circumferentially from one end of the axial guide groove along the convex ring and communicates with the axial guide groove; The smoke chamber assembly includes: The smoke chamber body is used to contain the aerosol-generated products; A smoke chamber base is located at the end of the smoke chamber body, and the outer peripheral wall of the smoke chamber base is provided with an outwardly protruding part; The protrusion can slide into the axial guide groove along the axial direction of the protruding ring, and then rotate around the circumference of the protruding ring to fit into the circumferential locking groove, so that the smoke chamber assembly engages with the protruding ring; and the protrusion can rotate around the circumference of the protruding ring to slide out of the circumferential locking groove, and then slide out of the axial guide groove along the axial direction of the protruding ring, so that the smoke chamber assembly disengages from the protruding ring.

3. The heating element contamination test fixture as described in claim 2, characterized in that, The smoke chamber body includes: hull; Smoke dispenser, including: A receiving cavity for containing the aerosol-generated product; A smoke extractor housing, fitted around the outer periphery of the chamber and detachably connected to the chamber, includes: The top housing is located at the top of the receiving cavity and is fixedly connected to the receiving cavity. It is provided with an opening for inserting the aerosol generating product and a perforation arranged opposite to it. A non-elastic traction rope, with both ends of the non-elastic traction rope passing through the perforation to be fixedly connected to the top shell; Specifically, the non-elastic traction rope is pulled along the axial direction away from the cabin body to drive the smoke lifter away from the cabin body, thereby driving the aerosol generating product to detach from the heating element as a whole.

4. The heating element contamination test fixture as described in claim 1, characterized in that, The heating element also includes: A flange seat is fixed to the tail end of the heating element, and the electrical connector is located at the bottom of the flange seat; The heating element contamination test fixture also includes a heating element fixing assembly, which includes: The top cover has perforations for the heating element; The lower cover has an electrical connector through hole and forms a cavity with the upper cover. The flange seat is located in the cavity. The heating element and the electrical connector both pass through the heating element through hole.

5. The heating element contamination test fixture as described in claim 1, characterized in that, Also includes: The heating element mounting assembly includes: First base; The second base is disposed opposite to the first base, and a slot space is formed between the opposite side walls of the first base and the second base, and the heating element is engaged in the slot space.

6. The heating element contamination test fixture as described in claim 1, characterized in that, The terminal block is a screw-fixed terminal block, including: A wire channel for accommodating the electrical connector; A screw channel, which is perpendicular to and communicates with the wire channel, is used to accommodate screws; The screw is inserted into the screw channel to press and fix the electrical connector within the wire channel; when the screw exits the screw channel, the pressure of the screw on the electrical connector is released, and the electrical connector can be removed from the wire channel.

7. The heating element contamination test fixture as described in claim 6, characterized in that, The top wall of the housing is provided with a wiring opening, and the heating element contamination test fixture also includes: The cover covers the wiring opening and is detachably connected to the housing. When the cover is separated from the housing, the entrance to the screw channel is exposed, allowing the screw to pass through or out of the screw channel.

8. The heating element contamination test fixture as described in claim 1, characterized in that, The terminal block is a pluggable terminal block, including: The first connector is fixedly connected to the circuit control unit; The second connector is fixedly connected to the heating element; The first connector and the second connector are pluggable and detachable, and the heating element can be electrically connected to or disconnected from the circuit control unit by plugging and unplugging the first connector and the second connector. or, The terminal block is a push-button type terminal block, including: terminal body; The pressing operation part is located at the upper end of the terminal body; A wire clamping mechanism is located inside the terminal body and is driven to cooperate with the pressing operation part to clamp the electrical connector. The wire clamping mechanism can be switched between an open state and a closed state by pressing or releasing the pressing operation part; in the open state, the electrical connector can extend into or out of the wire clamping mechanism; in the closed state, the wire clamping mechanism can clamp the electrical connector that has extended into the wire clamping mechanism.

9. The heating element contamination test fixture as described in claim 1, characterized in that, It also includes a power supply, the heating element has a room temperature resistance and a temperature coefficient of resistance, and the circuit control unit further includes: A semiconductor switching element, wherein the power transmission terminal of the semiconductor switching element is connected to the heating element, and outputs power to the heating element; A driving element, the output terminal of which is connected to the signal input terminal of the semiconductor switching element, is used to control the conduction state of the semiconductor switching element in order to control the power supplied by the semiconductor switching element to the heating element; The detection circuit is electrically connected to the power supply and the heating element respectively, and is used to detect the electrical parameters; The control unit has its signal output terminal connected to the signal input terminal of the driving element, and its signal input terminal connected to the signal output terminal of the detection circuit. The control unit is configured to determine the current resistance of the heating element based on the electrical parameters detected by the detection circuit, and then control the output state of the driving element based on the difference between the current resistance and the target resistance to adjust the power supplied to the heating element by the semiconductor switching element. The target resistance is determined based on the heating temperature that the heating element needs to reach during the heating process, the room temperature resistance, and the resistance temperature coefficient.

10. The heating element contamination test fixture as described in claim 9, characterized in that, The detection circuit includes: A detection resistor is provided, the first end of which is connected to the first end of the heating element; the electrical parameters include a first voltage at the second end of the detection resistor, a second voltage at the second end of the heating element, and a first current flowing through the detection resistor. The control unit is also configured to receive the first voltage, the second voltage, and the first current, and to determine the current resistance of the heating element based on the first voltage, the second voltage, and the first current.

11. The heating element contamination test fixture as described in claim 10, characterized in that, The detection circuit further includes: An operational amplifier, wherein the non-inverting input terminal of the operational amplifier is connected to the first terminal of the detection resistor, and the inverting input terminal of the operational amplifier is connected to the second terminal of the detection resistor, for amplifying the voltage difference across the detection resistor.

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