Clamping fixture and test system

Abstract

The application relates to a clamping jig and a testing system. The clamping jig comprises a fixing mechanism including a first fixing seat and a second fixing seat arranged at intervals, and a conductive unit including two conductive columns arranged at intervals and jointly matched between the first fixing seat and the second fixing seat. An end of each conductive column and the second fixing seat form a fixing gap for limiting a heating body, and the conductive unit is used for measuring the resistance value of the heating body. The clamping jig limits the heating body in the fixing gap jointly formed by the conductive column and the second fixing seat, and the conductive column directly contacts the heating body to measure the resistance value of the heating body while fixing the heating body, so that the contact stability of the heating body and the conductive column during the testing process is ensured, and the testing accuracy is improved.

Description

Technical Field

[0001] This application relates to the field of atomization technology, and in particular to a clamping fixture and testing system. Background Technology

[0002] An atomizing device is a device that forms an aerosol from a stored atomizing medium through heating or other methods. Some atomizing devices heat the heating element by energizing it, thereby heating the aerosol-forming matrix and atomizing it to produce aerosols. Therefore, controlling the temperature of the heating element is a key factor affecting the quality of the aerosol.

[0003] To accurately control the temperature of the heating element, it is necessary to determine its temperature coefficient of resistance (TCR). The TCR is typically measured and calculated as follows: TCR = (R2 - R1) / (R1) / (T2 - T1) = (R2 – R1) / (R1 * ΔT), where TCR is the TCR of the heating element, T1 is the initial temperature, T2 is the preset temperature, R1 is the resistance at the initial temperature, and R2 is the resistance at the preset high temperature. By measuring the resistance of the heating element at different temperatures and substituting it into the above formula, the corresponding TCR of the heating element can be calculated.

[0004] However, due to structural defects, existing heating element resistance temperature coefficient measuring devices are difficult to fix effectively, resulting in poor accuracy of resistance temperature coefficient measurement, which in turn is not conducive to the temperature control of the heating element. Utility Model Content

[0005] Therefore, it is necessary to provide a clamping fixture and testing system to address the problem that the heating element resistance temperature coefficient measuring device cannot effectively fix the heating element.

[0006] A clamping fixture for fixing a heating element, the clamping fixture comprising:

[0007] The fixing mechanism includes a first fixing seat and a second fixing seat arranged at intervals; and

[0008] The conductive unit includes two conductive posts, which are spaced apart and jointly connected between the first fixing base and the second fixing base;

[0009] In this configuration, a fixed gap is formed between one end of each conductive post and the second fixing base to limit the heating element, and the conductive unit is used to measure the resistance value of the heating element.

[0010] In one embodiment, the clamping fixture includes a plurality of conductive units, which are arranged at circumferential intervals along the second fixing base.

[0011] In one embodiment, the conductive post includes a conductive body, a connecting portion, and a conductive part. The connecting portion and the conductive part are respectively disposed at opposite ends of the conductive post. The connecting portion is located within the first fixing portion, and the conductive part and the second fixing seat form the fixing gap.

[0012] In one embodiment, the outer diameter of the conductive post body is larger than the outer diameter of the connecting portion and the outer diameter of the conductive portion.

[0013] In one embodiment, the distance between the conductive portions of the two conductive pillars of the same conductive unit is adjustable.

[0014] In one embodiment, the conductive post body is rotatable about its own axis relative to the fixing mechanism, and the conductive part is eccentrically positioned relative to the central axis of the conductive post body.

[0015] In one embodiment, the conductive post is movable relative to the second fixed seat in the spacing direction between the first fixed seat and the second fixed seat, so that the height of the fixed gap is adjustable.

[0016] In one embodiment, the clamping fixture further includes an adjusting member located between the first fixing seat and the conductive post. The adjusting member is used to apply a force toward the second fixing seat to the conductive post, and the adjusting member is capable of recoverable deformation under external force.

[0017] A testing system for testing the temperature coefficient of resistance of a heating element, the testing system comprising the aforementioned clamping fixture, and further comprising:

[0018] A heating device has a heating groove open at one end for containing a heating medium. The first fixing seat of the clamping fixture is supported outside the open end of the heating groove. The fixing gap is located inside the heating groove. The heating device is used to heat a heating element fixed to the clamping fixture.

[0019] The testing device is electrically connected to the clamping fixture and is used to obtain the resistance of the heating element and the heating temperature of the heating device.

[0020] In one embodiment, the testing device and the clamping fixture are electrically connected using a four-wire method.

[0021] In the aforementioned clamping fixture, the heating element is confined within the fixed gap formed by the conductive post and the second fixed base. While fixing the heating element, the conductive post directly contacts the heating element to measure its resistance value. This effectively fixes the heating element and ensures the contact stability between the heating element and the conductive post during the test, thereby improving the test accuracy. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a test system according to an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the clamping fixture of a test system according to an embodiment of this application.

[0026] Figure 3 for Figure 2 A magnified view of part A of the clamping fixture shown.

[0027] Figure 4 for Figure 2 A schematic diagram of the conductive post of the clamping fixture shown.

[0028] Figure 5 This is a schematic diagram of the heating device and clamping fixture of a test system according to an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100. Testing system; 120. Clamping fixture; 121. Fixing mechanism; 1212. First fixing seat; 1214. Second fixing seat; 1216. Fixing column; 123. Conductive unit; 1232. Conductive column; 1232a. Conductive column body; 1232b. Connecting part; 1232c. Conductive part; 1232d. Cam part; 1232e. Limiting part; 1234. Nut; 1236. Washer; 125. Adjusting part; 140. Heating device; 142. Heating tank; 160. Testing device; 200. Heating element. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0037] See Figures 1 to 3 One embodiment of this application provides a test system 100 for testing the temperature coefficient of resistance (TCR) of a component under test. The temperature coefficient of resistance is a ratio parameter that describes the change of resistance value with temperature, representing the relative change of resistance value when the temperature changes by 1°C, and the unit is ppm / °C.

[0038] In the following embodiments, the test system 100 is used to measure the temperature coefficient of resistance of the heating element 200 of the electronic atomizing device. The heating element 200 includes a substrate and a heating layer formed on the substrate. The substrate may be formed of a high-temperature resistant porous material such as ceramic, and the heating layer may be formed of a conductive material such as metal wire. The heating element 200 can be heated by electrical energy, thereby heating and atomizing the atomizing medium stored in the electronic atomizing device, ultimately producing an aerosol for the user to use. It is understood that the shape of the heating element 200 is not limited; in some embodiments, the heating element 200 is cubic.

[0039] It should be noted that the embodiments of this application are only used as illustrative examples and do not limit the technical scope of this application. In some other embodiments, the test system 100 can also be used to test the temperature coefficient of resistance of other components.

[0040] The testing system 100 includes a clamping fixture 120, a heating device 140, and a testing device 160. The clamping fixture 120 is used to fix the heating element 200 and confine it within the heating device 140. The heating device 140 is used to heat the heating element 200. The testing system 100 is used to acquire the resistance change curve of the heating element 200 during the heating process, and then obtain the temperature coefficient of resistance of the heating element 200 based on the resistance change curve.

[0041] In some embodiments, the clamping fixture 120 includes a fixing mechanism 121 and a conductive unit 123. The fixing mechanism 121 includes a first fixing seat 1212 and a second fixing seat 1214 spaced apart. The conductive unit 123 includes two conductive posts 1232, each spaced apart and connected between the first fixing seat 1212 and the second fixing seat 1214. A fixed gap is formed between one end of each conductive post 1232 and the second fixing seat 1214 to limit the heating element 200. The conductive unit 123 is used to measure the resistance value of the heating element 200.

[0042] Thus, the heating element 200 is confined within the fixed gap formed by the conductive post 1232 and the second fixing seat 1214. While fixing the heating element 200, the conductive post 1232 directly contacts the heating element 200 to measure its resistance value. This effectively fixes the heating element 200 and ensures the contact stability between the heating element 200 and the conductive post 1232 during the test, thereby improving the test accuracy.

[0043] In the following embodiments, the height direction of the clamping fixture 120 is defined as the first direction (i.e. Figure 2 The Z direction shown is the second direction, and the length direction of the clamping fixture 120 is the second direction (i.e., the length direction of the fixture 120 is the second direction). Figure 2 The width direction of the clamping fixture 120 is the third direction (as shown in the X direction). Figure 2 As shown in the Y direction), the first direction, the second direction, and the third direction intersect each other. In a preferred embodiment, the first direction, the second direction, and the third direction are perpendicular to each other.

[0044] Please see Figures 2 to 4 The first fixing seat 1212 and the second fixing seat 1214 are rectangular flat plate structures. The first fixing seat 1212 and the second fixing seat 1214 are spaced apart and parallel in a first direction. The thickness direction of the first fixing seat 1212 and the second fixing seat 1214 is parallel to the first direction. The length direction of the first fixing seat 1212 and the length direction of the second fixing seat 1214 are parallel to the second direction. The width direction of the first fixing seat 1212 and the second fixing seat 1214 is parallel to the third direction.

[0045] In a preferred embodiment, a rectangular connecting slot is formed at the center of the first fixing seat 1212 and the second fixing seat 1214, thereby reducing the weight of the fixing mechanism 121 while ensuring structural strength. The length of the first fixing seat 1212 is greater than the length of the second fixing seat 1214, which facilitates its cooperation with the heating device 140. It is understood that the shapes of the first fixing seat 1212 and the second fixing seat 1214 are not limited and can be set as needed to meet different requirements.

[0046] In some embodiments, the clamping fixture 120 further includes multiple fixing posts 1216, each fixing post 1216 having a central axis extending along a first direction. The two ends of each fixing post 1216 are respectively inserted into a first fixing seat 1212 and a second fixing seat 1214, and are respectively fixed to the first fixing seat 1212 and the second fixing seat 1214 by nuts, thereby fixing the first fixing seat 1212 and the second fixing seat 1214 relatively. Specifically, in one embodiment, the clamping fixture 120 includes four fixing posts 1216 arranged in a matrix. It is understood that the number and arrangement of the fixing posts 1216 are not limited and can be configured as needed to meet different fixing requirements.

[0047] The clamping fixture 120 includes multiple conductive units 123, which are arranged at intervals along the circumference of the second fixing base 1214. Each conductive unit 123 is used to fix and test one heating element 200. In this way, the clamping fixture 120 can simultaneously fix multiple heating elements 200 through multiple sets of conductive units 123 and simultaneously obtain the temperature coefficient of resistance of multiple heating elements 200, thereby realizing batch testing of heating elements 200 and effectively improving testing efficiency.

[0048] In one specific embodiment, the clamping fixture 120 includes four sets of conductive units 123. Two sets of conductive units 123 are spaced apart on opposite sides of the fixing mechanism 121 in a first direction, and all conductive posts 1232 in each set of conductive units 123 are spaced apart along a second direction. The remaining two sets of conductive units 123 are spaced apart on opposite sides of the fixing mechanism 121 in a second direction, and all conductive posts 1232 in each set of conductive units 123 are spaced apart along the first direction. It is understood that the number and arrangement direction of the conductive posts 1232 are not limited to this and can be configured as needed to meet different requirements.

[0049] The conductive post 1232 includes an integrally formed conductive post body 1232a, a connecting portion 1232b, and a conductive portion 1232c. The conductive post body 1232a has a cylindrical structure, and its central axis is parallel to a first direction. The connecting portion 1232b and the conductive portion 1232c are respectively located at opposite ends of the conductive post 1232. The connecting portion 1232b is confined within a first fixing seat 1212, and a fixing gap is formed between the conductive portion 1232c and a second fixing seat 1214 for fixing the heating element 200.

[0050] In a preferred embodiment, the conductive post 1232 is formed of copper or its alloy, which has good conductivity. Since the resistance of the conductive post 1232 is inversely proportional to its cross-sectional area, the outer diameter of the conductive post body 1232a is larger than the outer diameters of the connecting portion 1232b and the conductive portion 1232c, thereby effectively reducing the resistance of the conductive post 1232 and meeting the requirement that the external resistance of the heating element 200 be ≤10mΩ during testing. Furthermore, in some embodiments, the conductive post 1232 may be plated, for example, with a gold layer, to further reduce its resistance.

[0051] It is understandable that, under the condition of meeting other requirements, the outer diameter of the conductive post 1232 is larger, thereby further reducing its own resistance. The material of the conductive post 1232 can be set as needed, or the conductive post 1232 can be treated by different methods to meet different requirements.

[0052] The first fixing seat 1212 has mounting holes, each corresponding to a conductive post 1232. The diameter of the mounting hole is larger than the outer diameter of the conductive post body 1232a. One end of the conductive post body 1232a with a connecting part 1232b is inserted into the mounting hole. The connecting part 1232b protrudes from the side of the first fixing seat 1212 facing away from the second fixing seat 1214, and the end of the connecting part 1232b that connects to the conductive post body 1232a has an external thread. The conductive unit 123 also includes a nut 1234 and a washer 1236. The washer 1236 is sleeved on the connecting part 1232b and abuts against the first fixing seat 1212. The nut 1234 is sleeved on the connecting part 1232b and abuts against the side of the washer 1236 facing away from the mounting hole, and the nut 1234 is threadedly connected to the conductive post body 1232a.

[0053] A cam portion 1232d protrudes from the outer side of one end of the conductive post body 1232a facing the second fixing seat 1214. A conductive portion 1232c protrudes from the side of the cam portion 1232d away from the conductive post body 1232a. The conductive portion 1232c is eccentrically positioned relative to the central axis of the conductive post body 1232a. The conductive post body 1232a can rotate relative to the fixing mechanism 121 around its own axis, thereby driving the conductive portion 1232c to rotate around the central axis of the conductive post body 1232a. In this way, by rotating at least one conductive post 1232 in the same conductive unit 123, the distance between the conductive portions 1232c of the two conductive posts 1232 can be adjusted, thereby adapting to heating elements 200 of different shapes.

[0054] In some embodiments, in the first direction, the conductive post 1232 can move relative to the second fixing seat 1214 to make the height of the fixing gap adjustable in the first direction, thereby making the conductive post 1232 elastically pre-press and fasten the heating element 200, thereby ensuring that during temperature changes, the contact between the heating element 200 and the conductive post 1232 is prevented from loosening due to the thermal barrier contraction of the heating element 200 and the clamping fixture 120 itself, thereby further improving the fixing stability of the heating element 200.

[0055] Specifically, the clamping fixture 120 also includes an adjusting member 125, which is located between the first fixed seat 1212 and the conductive post 1232. The adjusting member 125 is used to apply a force toward the second fixed seat 1214 to the conductive post 1232, and the adjusting member 125 can undergo recoverable deformation under the action of external force.

[0056] More specifically, the conductive post body 1232a of the conductive post 1232 has a circumferentially extending annular limiting portion 1232e protruding from it. The adjusting member 125 is a compression spring, which is sleeved on the conductive post body 1232a. One end of the adjusting member 125 abuts against the surface of the first fixing seat 1212 facing the second fixing seat 1214, and the other end of the adjusting member 125 abuts against the limiting portion 1232e of the conductive post 1232. The adjusting member 125 is in a compressed state, thereby providing a force to the conductive post 1232 toward the second fixing seat 1214. It can be understood that the specific structure of the adjusting member 125 is not limited to this, and it may also be formed of elastic materials such as rubber.

[0057] The heating device 140 has a heating groove 142 with one end open. The heating groove 142 contains a heating medium for heating. The first fixing seat 1212 of the clamping fixture 120 is supported outside the opening end of the heating groove 142. The fixing gap is located inside the heating groove 142, so that the heating element 200 fixed in the fixing gap is immersed in the heating medium. The heating device 140 can automatically and accurately heat the heating element 200 fixed in the clamping fixture 120.

[0058] In a preferred embodiment, the heating device 140 is an oil bath with automatically controllable heating temperature. The heating medium is preferably silicone oil with a viscosity ≤500 cSt, thus exhibiting good fluidity and high temperature uniformity, with a uniformity and accuracy ≤±0.5℃. It is understood that in other embodiments, the specific material of the heating medium is not limited to this and can be set as needed to meet different heating requirements.

[0059] In some embodiments, the testing device 160 and the clamping fixture 120 are electrically connected via a four-wire connection. One end of the connection is connected to the conductive post 1232 via a nut 1234, and the other end is connected to the testing device 160. The testing device 160 can automatically acquire the resistance change curve of the heating element 200 fixed to the clamping fixture 120, thereby eliminating human measurement errors. Furthermore, it supports multi-channel acquisition for multiple conductive units 123, enabling batch testing in a single operation and effectively improving testing efficiency. It is understood that the electrical connection method between the testing device 160 and the clamping fixture 120 is not limited and can be configured as needed to meet different connection requirements.

[0060] The four-wire method (also known as the four-terminal measurement technique or Kelvin measurement method) is a method for impedance measurement in electronic circuits, mainly used for accurate measurement of low resistance values. It eliminates the influence of test leads and contact resistance by separating the current excitation and voltage detection circuits, thus achieving high measurement accuracy. Therefore, connecting the test device 160 and the clamping fixture 120 using the four-wire method can eliminate the influence of external wiring resistance, further improving measurement accuracy.

[0061] The aforementioned testing system 100 can effectively fix and stably connect the heating element 200 through the clamping fixture 120, and realize functions such as automatic heating, data acquisition, and report generation through the heating device 140 and the testing device 160. It can also automatically control the temperature rise and fall and stabilize the temperature. Since the entire testing process can be carried out automatically, it effectively eliminates human testing errors and has high measurement accuracy and testing efficiency.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A clamping fixture for fixing a heating element, characterized in that, The clamping fixture includes: The fixing mechanism includes a first fixing seat and a second fixing seat arranged at intervals; and The conductive unit includes two conductive posts, which are spaced apart and jointly connected between the first fixing base and the second fixing base; In this configuration, a fixed gap is formed between one end of each conductive post and the second fixing base to limit the heating element, and the conductive unit is used to measure the resistance value of the heating element.

2. The clamping fixture according to claim 1, characterized in that, The clamping fixture includes a plurality of conductive units, which are arranged at circumferential intervals along the second fixed base.

3. The clamping fixture according to claim 1, characterized in that, The conductive post includes a conductive body, a connecting part, and a conductive part. The connecting part and the conductive part are respectively disposed at opposite ends of the conductive post. The connecting part is confined to the first fixing part, and the conductive part and the second fixing seat form the fixing gap.

4. The clamping fixture according to claim 3, characterized in that, The outer diameter of the conductive post body is larger than the outer diameter of the connecting part and the outer diameter of the conductive part.

5. The clamping fixture according to claim 3, characterized in that, The distance between the conductive portions of the two conductive pillars of the same conductive unit is adjustable.

6. The clamping fixture according to claim 5, characterized in that, The conductive post body is rotatable relative to the fixing mechanism around its own axis, and the conductive part is eccentrically positioned relative to the central axis of the conductive post body.

7. The clamping fixture according to claim 1, characterized in that, In the direction of the interval between the first fixed seat and the second fixed seat, the conductive post can move relative to the second fixed seat to make the height of the fixed gap adjustable.

8. The clamping fixture according to claim 7, characterized in that, The clamping fixture further includes an adjusting member, which is located between the first fixed seat and the conductive post. The adjusting member is used to apply a force toward the second fixed seat to the conductive post, and the adjusting member is capable of undergoing recoverable deformation under external force.

9. A testing system for testing the temperature coefficient of resistance of a heating element, characterized in that, The testing system includes the clamping fixture as described in any one of claims 1 to 8, and the testing system further includes: A heating device has a heating groove open at one end for containing a heating medium. The first fixing seat of the clamping fixture is supported outside the open end of the heating groove. The fixing gap is located inside the heating groove. The heating device is used to heat a heating element fixed to the clamping fixture. The testing device is electrically connected to the clamping fixture and is used to obtain the resistance of the heating element and the heating temperature of the heating device.

10. The testing system according to claim 9, characterized in that, The testing device and the clamping fixture are electrically connected using a four-wire method.

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