Surface thermal conductivity detection device and liquid security inspection instrument

Abstract

The utility model discloses a surface thermal conductivity detection device and liquid security inspection instrument, including: a base shell and a detection structure wherein the base shell is provided with a detection platform suitable for placing a sample to be detected, and the detection platform is provided with a detection through hole; the detection structure is arranged at the bottom end of the detection platform and is connected with the base shell; the detection structure comprises a detection assembly and a pressure sensor. One end of the pressure sensor is connected with the base shell, and the other end of the pressure sensor is connected with the detection assembly; the top end of the detection assembly is suitable for penetrating through the detection through hole to make contact with a to-be-detected sample on the detection platform to detect the surface thermal conductivity of the to-be-detected sample, and the pressure sensor is used for detecting the pressure of the to-be-detected sample on the detection assembly. According to the structure, the pressure sensor is additionally arranged, the measured temperature rise is compensated, the final temperature rise is obtained, then the heat conductivity difference is calculated, the type of a to-be-detected sample is judged, and the accuracy and stability of a detection result are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid security inspection, and in particular to a surface thermal conductivity detection device and a liquid security inspection instrument. Background Art

[0002] Dangerous liquid security detector is a security inspection instrument specially used to detect flammable and explosive liquids. It uses quasi-static computer tomography technology to determine its flammability and explosiveness. The detector can distinguish flammable and explosive liquids such as gasoline, acetone, ethanol, and thinner from safe liquids such as water, cola, milk, and juice without direct contact with the liquid.

[0003] Among the existing liquid security inspection solutions, the mainstream solution for the safety detection of liquid detection in metal containers is to detect and distinguish the surface thermal conductivity of metal containers. At present, the common surface thermal conductivity detection method is the thermocouple detection probe, which is a metal spring structure. The metal probe's own deformation achieves the contact area and detection purpose.

[0004] However, in the above detection scheme, the impact of the fitting effect between the metal container and the sensor cannot be ignored. If the pressure deformation cannot be kept consistent and the contact area is inconsistent during the actual test, it will easily lead to inconsistent temperature control, collection and results. Technical disadvantages such as poor product repeatability will cause a high false alarm rate. Utility Model Content

[0005] Therefore, the technical problem to be solved by the utility model is that the influence of the fitting effect between the metal container and the sensor cannot be ignored; if during the actual test, the pressure deformation cannot be kept consistent and the contact area is inconsistent, it will easily lead to inconsistent temperature control, collection and results. Technical disadvantages such as poor product repeatability will cause a high false alarm rate.

[0006] To this end, the utility model provides a surface thermal conductivity detection device, comprising:

[0007] A base shell, wherein a detection platform suitable for placing a sample to be detected is provided on the base shell, and a detection through hole is provided on the detection platform;

[0008] A detection structure, which is arranged at the bottom end of the detection platform and is connected to the base shell;

[0009] The detection structure includes: a detection component and a pressure sensor; one end of the pressure sensor is connected to the base shell, and the other end of the pressure sensor is connected to the detection component; the top end of the detection component is suitable for passing through the detection through hole to contact the sample to be detected on the detection platform to detect the difference in thermal conductivity of the sample to be detected, and the pressure sensor is used to detect the pressure of the sample to be detected on the detection component.

[0010] Optionally, the above detection component includes:

[0011] A base, wherein the base is fixed on the pressure sensor;

[0012] A detection membrane body, wherein the detection membrane body is fixedly arranged on the base;

[0013] A heat-conducting layer, the heat-conducting layer is arranged on the top surface of the detection film body, the heat-conducting layer is arranged corresponding to the detection through hole, and the heat-conducting layer is suitable for passing through the detection through hole to contact the sample to be detected;

[0014] A detection resistor is fixed at one end of the detection film body close to the base, and the detection resistor is arranged corresponding to the heat conductive layer.

[0015] Optionally, the detection resistor includes:

[0016] A heating resistor, the heating resistor is fixed on the detection film body, and the heating resistor is used to thermally excite the end of the heat-conducting layer;

[0017] A temperature measuring resistor is arranged on one side of the heating resistor, the temperature measuring resistor and the heating resistor are arranged at an interval, and the temperature measuring resistor is used to detect the temperature rise of the heat conducting layer area corresponding to the temperature measuring resistor.

[0018] Optionally, the base is provided with a first through hole corresponding to the detection membrane body;

[0019] The detection assembly includes a base assembly and a guide support, and the base assembly includes:

[0020] A base body, the base body being mounted on an end of the base away from the detection membrane body;

[0021] A guide seat, the guide seat is arranged on a side of the base body close to the detection membrane body corresponding to the first through hole, and a guide hole is opened in the guide seat along the axial direction of the first through hole; one end of the guide support member is installed in the guide hole, and the other end of the guide support member is located in the first through hole;

[0022] An elastic member, wherein the elastic member is sleeved on the guide support member, one end of the elastic member abuts against the guide seat and the other end of the elastic member abuts against the guide support member.

[0023] Optionally, the above-mentioned guide support member includes: a support part and a guide part, the support part is located in the first through hole, the guide part is fixed to one end of the support part away from the detection membrane body, the guide part is installed in the guide hole, and the elastic member is sleeved on the guide part.

[0024] Optionally, the above-mentioned detection component also includes an elastic adjustment member, which is placed on a side of the support portion away from the guide portion, and the guide support portion moves toward the detection membrane body to make the elastic adjustment member press against the detection membrane body, so that the detection membrane body fits the sample to be detected.

[0025] Optionally, the elastic adjusting member is made of elastic material.

[0026] Optionally, the above-mentioned surface thermal conductivity detection device further includes a fixing piece, a fixing hole is opened on the base, and the fixing piece passes through the base assembly and is installed in the fixing hole to fix the base assembly on the base.

[0027] Optionally, the above-mentioned surface thermal conductivity detection device further includes a proximity monitoring component, and a proximity switch detection hole is also provided on the detection platform;

[0028] The proximity monitoring component comprises:

[0029] A fixed connection member, the fixed connection member is arranged below the detection platform, and the fixed connection member is fixedly connected to the base shell;

[0030] A proximity switch sensor is fixed on the fixed connector, and a detection end of the proximity switch sensor passes through the proximity switch detection hole to detect whether there is a sample to be detected on the detection platform.

[0031] A liquid security inspection instrument, characterized in that it comprises a shell and the above-mentioned surface thermal conductivity detection device, wherein the surface thermal conductivity detection device is fixed on the shell.

[0032] The technical solution provided by the utility model has the following advantages:

[0033] 1. The utility model provides a surface thermal conductivity detection device, a base shell and a detection structure, wherein a detection platform suitable for placing a sample to be detected is opened on the base shell, and a detection through hole is opened on the detection platform; the detection structure is arranged at the bottom of the detection platform, and the detection structure is connected to the base shell; the detection structure includes: a detection component and a pressure sensor; one end of the pressure sensor is connected to the base shell, and the other end of the pressure sensor is connected to the detection component; the top end of the detection component is suitable for passing through the detection through hole to contact the sample to be detected on the detection platform to detect the difference in thermal conductivity of the sample to be detected, and the pressure sensor is used to detect the pressure of the sample to be detected on the detection component.

[0034] The surface thermal conductivity detection device in this structure includes a base shell and a detection structure. A detection platform is arranged on the base shell. The sample to be detected is placed on the detection platform for detection. The detection platform is provided with a detection through hole. The detection structure includes a detection component and a pressure sensor. The detection component and the pressure sensor are both arranged below the detection platform. One end of the pressure sensor is indirectly fixed to the base shell, and the other end of the pressure sensor is fixedly connected to the detection component. A detection through hole is opened on the detection platform. The top end of the detection component passes through the detection through hole and contacts with the sample to be detected on the detection platform. The surface thermal conductivity detection device in this embodiment acts on a metal container and a liquid contained in the metal container; that is, the sample to be detected is a liquid contained in a metal container, and the metal container is a container such as a metal bottle. When the sample to be tested needs to be tested, the sample to be tested is placed on the testing platform, the top of the testing component is pressed against the side of the sample to be tested, that is, the side of the metal container, and the testing component heats the sample to be tested and measures the temperature; in the process of contact between the sample to be tested and the testing component, while the top of the testing component is pressed against the side of the sample to be tested, the sample to be tested will apply a pressure to the testing component. When the pressure is large, the contact is good at this time, and the measured temperature rise is low; on the contrary, the pressure is small, the contact is poor, and the measured temperature rise will be high. It shows that the surface pressure is related to the measured temperature rise, which will affect the measurement of the surface thermal conductivity. Therefore, in this embodiment, a pressure sensor is added, and after the heating measurement sensor is heated and the temperature is measured, and the pressure sensor measures the contact pressure value, it is input to the MCU, which is a microcontroller unit. The measured temperature rise is compensated by the MCU to obtain the final temperature rise, and then the thermal conductivity difference is calculated, and then the type of the sample to be tested is judged, which effectively improves the accuracy and stability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 This is a schematic diagram of the overall structure of the surface thermal conductivity detection device provided in the utility model;

[0037] Figure 2 It is a structural schematic diagram of the base shell provided in the utility model;

[0038] Figure 3 It is a schematic diagram of the overall structure of the detection structure provided in the utility model;

[0039] Figure 4This is an exploded schematic diagram of the detection assembly provided in the utility model;

[0040] Figure 5 This is a schematic diagram of the structure of the guide support member provided in the utility model;

[0041] Figure 6 This is a schematic diagram of the structure of the detection membrane body and the heat-conducting layer provided in the utility model;

[0042] Figure 7 It is a structural schematic diagram of the detection membrane body and the detection resistor provided in the utility model;

[0043] Description of reference numerals:

[0044] 1-base shell; 11-detection platform; 111-detection through hole; 112-proximity switch detection hole;

[0045] 2-detection structure; 21-detection assembly; 211-base; 2111-first through hole; 212-detection membrane body; 213-heat-conducting layer; 214-detection resistor; 2141-heating resistor; 2142-temperature measuring resistor; 215-base assembly; 2151-base body; 2152-guide seat; 2153-elastic member; 216-guide support member; 2161-support part; 2162-guide part; 22-pressure sensor;

[0046] 3-Elastic adjustment piece;

[0047] 4-Fixer;

[0048] 5 - proximity monitoring assembly; 51 - fixed connection piece; 52 - proximity switch sensor. DETAILED DESCRIPTION

[0049] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] Example 1

[0054] This embodiment provides a surface thermal conductivity detection device, such as Figures 1 to 7 As shown, a base shell 1 and a detection structure 2, wherein a detection platform 11 suitable for placing a sample to be detected is provided on the base shell 1, and a detection through hole 111 is provided on the detection platform 11; the detection structure 2 is arranged at the bottom end of the detection platform 11, and the detection structure 2 is connected to the base shell 1; the detection structure 2 includes: a detection component 21 and a pressure sensor 22; one end of the pressure sensor 22 is connected to the base shell 1, and the other end of the pressure sensor 22 is connected to the detection component 21; the top end of the detection component 21 is suitable for passing through the detection through hole 111 to contact the sample to be detected on the detection platform 11 to detect the surface thermal conductivity difference of the sample to be detected, and the pressure sensor 22 is used to detect the pressure of the sample to be detected on the detection component 21.

[0055] The surface thermal conductivity detection device in this structure includes a base shell 1 and a detection structure 2. A detection platform 11 is arranged on the base shell 1. The sample to be detected is placed on the detection platform 11 for detection. The detection platform 11 is provided with a detection through hole 111; the detection structure 2 includes a detection component 21 and a pressure sensor 22. The detection component 21 and the pressure sensor 22 are both arranged below the detection platform 11. One end of the pressure sensor 22 is indirectly fixed to the base shell 1, and the other end of the pressure sensor 22 is fixedly connected to the detection component 21. The detection through hole 111 is opened on the detection platform 11. The top end of the detection component 21 passes through the detection through hole 111 and contacts with the sample to be detected on the detection platform 11; the surface thermal conductivity detection device in this embodiment acts on a metal container and a liquid contained in the metal container; that is, the sample to be detected is a liquid contained in a metal container, and the metal container is a container such as a metal bottle.

[0056] When the sample to be tested needs to be tested, the sample to be tested is placed on the testing platform 11, and the top of the testing component 21 is pressed against the side of the sample to be tested, that is, the side of the metal container, and the testing component 21 heats the sample to be tested and measures the temperature rise; in the process of contact between the sample to be tested and the testing component 21, while the top of the testing component 21 is pressed against the side of the sample to be tested, the sample to be tested will apply a pressure to the testing component 21. When the pressure is large, the contact is good at this time, and the measured temperature rise is low; on the contrary, the pressure is small, the contact is poor, and the measured temperature rise will be high. It shows that the surface pressure is related to the measured temperature rise, which will affect the measurement of the surface thermal conductivity. Therefore, in this embodiment, a pressure sensor 22 is added. After the heating measurement sensor is heated and the temperature is measured, and the pressure sensor 22 measures the contact pressure value, it is input to the MCU, which is a micro control unit. The measured temperature rise is compensated by the MCU to obtain the final temperature rise, and then the thermal conductivity difference is calculated, and then the type of the sample to be tested is judged, which effectively improves the accuracy and stability of the test results.

[0057] In this embodiment, if Figures 1 to 7 As shown, the detection component 21 includes: a base 211, a detection film body 212, a thermal conductive layer 213 and a detection resistor 214; one side of the base 211 is fixed on the pressure sensor 22; the detection film body 212 is fixedly arranged on the base 211; the thermal conductive layer 213 is arranged on the top surface of the detection film body 212, and the thermal conductive layer 213 is arranged corresponding to the detection through hole 111, and the thermal conductive layer 213 is suitable for passing through the detection through hole 111 to contact the sample to be detected; the detection resistor 214 is fixed on one end of the detection film body 212 close to the base 211. The detection resistor 214 includes: a heating resistor 2141 and a temperature measuring resistor 2142; the heating resistor 2141 is fixed on the detection film body 212, and the heating resistor 2141 is used to heat the end of the thermal conductive layer 213; the temperature measuring resistor 2142 is arranged on one side of the heating resistor 2141, and the temperature measuring resistor 2142 and the heating resistor 2141 are arranged at intervals, and the temperature measuring resistor 2142 is used to detect the temperature rise of the thermal conductive layer 213 area corresponding to the temperature measuring resistor 2142.

[0058] The detection component 21 in this structure includes a base 211, which is fixed on the pressure sensor 22, and the entire detection component 21 is in a suspended state. The detection film body 212 is an FPC heating film, and the detection film body 212 is fixed on the base 211. A heat-conducting layer 213 is arranged on the top of the detection film body 212. The heat-conducting layer 213 is a layer of electroplated film. The heat-conducting layer 213 is arranged corresponding to the detection through hole 111. In a natural state, the heat-conducting layer 213 will pass through the detection through hole 111, and its height will be higher than the detection through hole 111; a detection resistor 214 is arranged on the bottom end of the detection film body 212, and the detection resistor 214 includes a heating resistor 2141 and a temperature measuring resistor 2142. Specifically: the detection resistor 214 includes two heating resistors 2141 and one temperature measuring resistor 2142. The temperature measuring resistor 2142 is arranged in the central area, and the two heating resistors 2141 and the temperature measuring resistor 2142 are arranged in the central area. The resistors 2141 are respectively arranged on both sides of the temperature measuring resistor 2142, and there is a distance between the heating resistor 2141 and the temperature measuring resistor 2142. When performing detection, a heating excitation with constant power and time is applied to the heating resistor 2141, which is conducted through the FPC heating film and the thermal conductive layer 213. The temperature measuring resistor 2142 can measure the temperature rise of the corresponding thermal conductive layer 213 area before and after heating, and this temperature rise is related to the heat transferred to the end of the temperature measuring resistor 2142. If the sample to be detected attached to the thermal conductive layer 213 contains a liquid with high thermal conductivity, then more heat is transferred to the sample to be detected, which leads to less heat at the end of the temperature measuring resistor 2142, thereby resulting in a smaller temperature rise at the end of the temperature measuring resistor 2142; otherwise, the temperature rise is larger; the above-mentioned temperature rise is used to match the thermal conductivity difference of the sample to be detected, thereby judging the type of the sample to be detected.

[0059] In this embodiment, if Figures 1 to 7As shown, the base 211 is provided with a first through hole 2111 corresponding to the detection membrane body 212; the detection component 21 includes a base component 215 and a guide support 216, and the base component 215 includes: a base body 2151, a guide seat 2152 and an elastic member 2153; the base body 2151 is installed on the end of the base 211 away from the detection membrane body 212; the guide seat 2152 is arranged on a side of the base body 2151 close to the detection membrane body 212 corresponding to the first through hole 2111, and a guide hole is opened in the guide seat 2152 along the axial direction of the first through hole 2111; one end of the guide support 216 is installed in the guide hole, and the other end of the guide support 216 is located in the first through hole 2111; the elastic member 2153 is sleeved on the guide support 216, one end of the elastic member 2153 abuts on the guide seat 2152 and the other end of the elastic member 2153 abuts on the guide support 216. The guide support member 216 includes: a support portion 2161 and a guide portion 2162 . The support portion 2161 is located in the first through hole 2111 . The guide portion 2162 is fixed to one end of the support portion 2161 away from the detection membrane body 212 . The guide portion 2162 is installed in the guide hole. The elastic member 2153 is sleeved on the guide portion 2162 .

[0060] The base 211 in this structure is also provided with a first through hole 2111, which is provided corresponding to the detection membrane body 212, and the axial direction of the first through hole 2111 is the gravity direction, and the first through hole 2111 is opened at the center of the base 211. The detection component 21 includes a base component 215 and a guide support 216, and the base component 215 is provided on a side of the base 211 away from the detection membrane body 212, and the base component 215 includes a base body 2151 and a guide seat 2152, and the guide seat 2152 is the base body 21 The guide seat 2152 is provided at the middle position of the guide seat 2152 and is provided in the direction of the detection membrane body 212. The guide seat 2152 is provided corresponding to the first through hole 2111. The outer wall shape of the guide seat 2152 is the same as the inner shape of the first through hole 2111, so that the outer wall of the guide seat 2152 can be arranged in close contact with the outer wall of the first through hole 2111. The guide seat 2152 is provided with a guide hole at the center position along the axial direction of the first through hole 2111. One end of the guide support member 216 is installed in the guide hole, and the guide support member 216 can slide along the guide hole.

[0061] The guide support member 216 includes a support portion 2161 and a guide portion 2162. The support portion 2161 is plate-shaped, and the shape of the support portion 2161 is the same as the shape of the first through hole 2111. The guide portion 2162 is columnar, and its outer diameter shape is the same as the shape of the inner wall of the guide hole. The support portion 2161 is arranged in the first through hole 2111, and the guide portion 2162 is fixedly connected to the support portion 2161. The guide portion 2162 is installed in the guide hole. The elastic member 2153 is set as a spring, and the spring is sleeved on the guide portion 2162. One end of the spring abuts on the guide seat 2152, and the other end of the spring abuts on the support portion 2161 of the guide support member 216. The elastic member 2153 drives the guide support member 216 to move in the direction of the detection membrane body 212 by elastic force, so as to elastically adjust the detection membrane body 212, so that the heat conductive layer 213 at the top of the detection membrane body 212 is fully in contact with the sample to be detected, thereby increasing the sensitivity and accuracy of the detection.

[0062] When the sample to be tested presses the test membrane body 212 downward, the test membrane body 212 will provide a downward force to the guide support 216. The spring can be provided for buffering to improve the stability of the entire device. At the same time, the reverse elastic force of the elastic member 2153 is utilized to make the heat conductive layer 213 at the top of the test membrane body 212 and the sample to be tested further fully contact.

[0063] In this embodiment, if Figures 1 to 7 As shown, the detection assembly 21 further includes an elastic adjustment member 3, which is placed on a side of the support portion 2161 away from the guide portion 2162, and the guide support 216 moves toward the detection membrane body 212 so that the elastic adjustment member 3 presses against the detection membrane body 212, so that the detection membrane body 212 fits the sample to be detected. The material of the elastic adjustment member 3 is an elastic material.

[0064] The detection component 21 in this structure also includes an elastic adjusting member 3, which is placed on a side of the support portion 2161 away from the guide portion 2162. The elastic adjusting member 3 is also located in the first through hole 2111. The elastic adjusting member 3 is made of an elastic material, and the elastic adjusting member 3 can be made of rubber or silicone sponge. Under the action of the above-mentioned elastic member 2153, the elastic member 2153 squeezes the guide support member 216 toward the detection membrane body 212, thereby pressing the elastic adjusting member 3 against the detection membrane body 212. The elastic adjusting member 3 provides an elastic squeezing force to the detection membrane body 212, so that the thermal conductive layer 213 at the top of the detection membrane body 212 fits against the side of the sample to be detected, allowing the thermal conductive layer 213 and the sample to be detected to further fully contact, thereby improving the sensitivity and accuracy of the detection.

[0065] In this embodiment, if Figures 1 to 7As shown, the surface thermal conductivity detection device further includes a fixing member 4 . A fixing hole is opened on the base 211 . The fixing member 4 passes through the base assembly 215 and is installed in the fixing hole to fix the base assembly 215 on the base 211 .

[0066] The surface thermal conductivity detection device in this structure also includes a fixing part 4, fixing holes are opened on both sides of the base 211, and holes are also opened on both sides of the base assembly 215 corresponding to the fixing holes, both holes are threaded holes, the fixing part 4 is a bolt, and the threaded end of the fixing part 4 passes through the hole on the base assembly 215 and is fixed on the base 211, thereby fixing the base assembly 215 to ensure the stability of the entire structure, and a spring is sleeved on the fixing part 4, and the spring is located between the base 211 and the base assembly 215. The two ends of the spring apply elastic force in the direction of the base 211 and the direction of the base assembly 215 respectively, thereby increasing the thread friction between the fixing part 4 and the base 211 and the base assembly 215, thereby increasing the stability of the base 211 and the base assembly 215.

[0067] In this embodiment, if Figures 1 to 7 As shown, the surface thermal conductivity detection device also includes a proximity monitoring component 5, and a proximity switch detection hole 112 is also opened on the detection platform 11; the proximity monitoring component 5 includes: a fixed connection member 51 and a proximity switch sensor 52, the fixed connection member 51 is arranged below the detection platform 11, and the fixed connection member 51 is fixedly connected to the base shell 1; the proximity switch sensor 52 is fixed on the fixed connection member 51, and the detection end of the proximity switch sensor 52 passes through the proximity switch detection hole 112 to detect whether there is a sample to be detected on the detection platform 11.

[0068] The surface thermal conductivity detection device in this structure also includes a proximity monitoring component 5, and a proximity switch detection hole 112 is also opened on the detection platform 11; the proximity monitoring component 5 is arranged below the detection platform 11, and the proximity monitoring component 5 includes a fixed connection 51 and a proximity switch sensor 52, the fixed connection 51 can be a sheet metal part, the sheet metal part is fixed on the base shell 1, the proximity switch sensor 52 is fixed on the fixed connection 51, and the top of the proximity switch sensor 52 passes through the proximity switch detection hole 112 to detect whether there is a sample to be detected on the detection platform 11, when the proximity switch sensor 52 detects that the sample to be detected is placed on the detection platform 11, the detection switch sensor transmits a signal to the control end, and the control end controls the detection structure 2 to detect the sample to be detected;

[0069] In other practicable embodiments, one end of the pressure sensor 22 away from the detection assembly 21 may also be fixed on the fixed connection member 51 .

[0070] Example 2

[0071] This embodiment provides a liquid security detector, including a housing and the surface thermal conductivity detection device in Embodiment 1, and the surface thermal conductivity detection device is fixed to the housing. This structure provides a liquid security detector, which can detect the type of liquid in a metal container by installing the surface thermal conductivity detection device in Embodiment 1, thereby improving the efficiency and safety of security inspection. Since the liquid security detector has the surface thermal conductivity detection device in Embodiment 1, it has all the beneficial effects of the surface thermal conductivity detection device in Embodiment 1.

[0072] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A surface thermal conductivity detection device, characterized in that: include: A base shell (1), wherein a detection platform (11) suitable for placing a sample to be detected is provided on the base shell (1), and a detection through hole (111) is provided on the detection platform (11); A detection structure (2), the detection structure (2) being arranged at the bottom end of the detection platform (11), and the detection structure (2) being connected to the base shell (1); The detection structure (2) comprises: a detection component (21) and a pressure sensor (22); one end of the pressure sensor (22) is connected to the base shell (1), and the other end of the pressure sensor (22) is connected to the detection component (21); the top end of the detection component (21) is suitable for passing through the detection through hole (111) to contact the sample to be detected on the detection platform (11) to detect the difference in thermal conductivity of the sample to be detected, and the pressure sensor (22) is used to detect the pressure of the sample to be detected on the detection component (21).

2. The surface thermal conductivity detection device according to claim 1, characterized in that: The detection component (21) comprises: A base (211), wherein the base (211) is fixed on the pressure sensor (22); A detection membrane body (212), wherein the detection membrane body (212) is fixedly arranged on the base (211); A heat-conducting layer (213), the heat-conducting layer (213) being arranged on the top surface of the detection film body (212), the heat-conducting layer (213) being arranged corresponding to the detection through hole (111), and the heat-conducting layer (213) being suitable for passing through the detection through hole (111) to contact the sample to be detected; A detection resistor (214), wherein the detection resistor (214) is fixed to one end of the detection film body (212) close to the base (211), and the detection resistor (214) is arranged corresponding to the heat conductive layer (213).

3. The surface thermal conductivity detection device according to claim 2, characterized in that: The detection resistor (214) comprises: A heating resistor (2141), the heating resistor (2141) being fixed on the detection film body (212), and the heating resistor (2141) being used to thermally excite the end of the heat-conducting layer (213); A temperature measuring resistor (2142), wherein the temperature measuring resistor (2142) is arranged on one side of the heating resistor (2141), the temperature measuring resistor (2142) and the heating resistor (2141) are arranged at an interval, and the temperature measuring resistor (2142) is used to detect the temperature rise of the heat conducting layer (213) area corresponding to the temperature measuring resistor (2142).

4. The surface thermal conductivity detection device according to claim 2, characterized in that: The base (211) is provided with a first through hole (2111) corresponding to the detection membrane body (212); The detection assembly (21) comprises a base assembly (215) and a guide support member (216), wherein the base assembly (215) comprises: A base body (2151), the base body (2151) being mounted on an end of the base (211) away from the detection membrane body (212); A guide seat (2152), the guide seat (2152) being arranged on a side of the base body (2151) close to the detection membrane body (212) corresponding to the first through hole (2111), and a guide hole is opened in the guide seat (2152) along the axial direction of the first through hole (2111); one end of the guide support member (216) is installed in the guide hole, and the other end of the guide support member (216) is located in the first through hole (2111); An elastic member (2153), wherein the elastic member (2153) is sleeved on the guide support member (216), one end of the elastic member (2153) abuts against the guide seat (2152) and the other end of the elastic member (2153) abuts against the guide support member (216).

5. The surface thermal conductivity detection device according to claim 4, characterized in that: The guide support member (216) comprises: a support portion (2161) and a guide portion (2162), wherein the support portion (2161) is located in the first through hole (2111), and the guide portion (2162) is fixed to an end of the support portion (2161) away from the detection membrane body (212), and the guide portion (2162) is installed in the guide hole, and the elastic member (2153) is sleeved on the guide portion (2162).

6. The surface thermal conductivity detection device according to claim 5, characterized in that: The detection assembly (21) further comprises an elastic adjustment member (3), wherein the elastic adjustment member (3) is placed on a side of the support portion (2161) away from the guide portion (2162), and the guide support member (216) moves toward the detection membrane body (212) so that the elastic adjustment member (3) is pressed against the detection membrane body (212), so that the detection membrane body (212) fits the sample to be detected.

7. The surface thermal conductivity detection device according to claim 6, characterized in that: The elastic adjusting member (3) is made of elastic material.

8. The surface thermal conductivity detection device according to claim 7, characterized in that: The surface thermal conductivity detection device also includes a fixing member (4), the base (211) is provided with a fixing hole, and the fixing member (4) passes through the base assembly (215) and is installed in the fixing hole to fix the base assembly (215) on the base (211).

9. The surface thermal conductivity detection device according to any one of claims 1 to 8, characterized in that: The surface thermal conductivity detection device further comprises a proximity monitoring component (5), and a proximity switch detection hole (112) is also provided on the detection platform (11); The proximity monitoring component (5) comprises: A fixed connection member (51), the fixed connection member (51) being arranged below the detection platform (11), and the fixed connection member (51) being fixedly connected to the base shell (1); A proximity switch sensor (52), the proximity switch sensor (52) being fixed on the fixed connection member (51), and a detection end of the proximity switch sensor (52) passing through the proximity switch detection hole (112) to detect whether there is a sample to be detected on the detection platform (11).

10. A liquid security inspection instrument, characterized in that: The invention comprises a shell and the surface thermal conductivity detection device according to any one of claims 1 to 9, wherein the surface thermal conductivity detection device is fixed on the shell.

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