Detection device for liquid in metal tank body

Abstract

The utility model relates to the technical field of metal detection, in particular to a device for detecting liquid in a metal tank body. The device comprises an inductance coil device, a resonance circuit driving device, an alternating current signal measuring device, a processing unit, a temperature measuring circuit and a temperature-sensitive sensor, the resonance circuit driving device is connected with the inductance coil device; the alternating current signal measuring device is connected with the inductance coil device; and the heating device is connected with the inductance coil device. And the processing unit can judge the material of the metal tank body according to the parameter change between the target alternating current signal and the initial alternating current signal. On the basis, the liquid in the inductance coil device and the metal tank body is heated, and whether the liquid in the metal tank body is dangerous liquid or not can be accurately judged by combining the detected temperature information with the material of the metal tank body. The liquid detection device is simple in structural design, low in structural cost and capable of accurately judging whether liquid in the metal tank body is dangerous liquid or not.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal detection technical field, especially relate to a detection device of metal tank body internal liquid. BACKGROUND

[0002] The detection of bottled dangerous liquid is widely applied in the field of public safety, and for the liquid in metal cans, currently, the heat conductivity measurement method is mostly used, that is, the temperature rise curve of the nearby tank body is detected after heating the tank body to determine whether the internal liquid is water or dangerous liquid such as gasoline. Commonly, the water can be drunk is mostly water, and the specific heat capacity is large, and under the same heating power condition, the tank body temperature rises slowly. For dangerous liquids such as gasoline, the specific heat capacity is smaller than that of water, so the temperature rises quickly. By measuring the temperature rise curve, it can be determined whether the liquid in the tank is dangerous or safe.

[0003] The traditional method may be wrong when measuring some special-shaped tank bodies, such as measuring the position of the ferromagnetic and non-ferromagnetic eddy current sensor, and the diameter of the tank body becomes smaller. At this time, the sensor is too far away from the tank body and may not be sensed. This leads to the output of incorrect signals of the sensor, thereby affecting the accuracy of the measurement. At the same time, the traditional measurement structure is complex in design, and the cost is relatively high, which affects the product competitiveness. UTILITY MODEL CONTENT

[0004] The utility model provides a detection device of metal tank body internal liquid to solve one or more technical problems existing in the prior art, and at least provides a beneficial choice or creates conditions.

[0005] Other characteristics and advantages of the utility model will become apparent from the following detailed description, or will be learned partly by the practice of the utility model.

[0006] According to one aspect of the embodiment of the utility model, a detection device of metal tank body internal liquid is provided, which comprises an inductor coil device, a resonant circuit driving device, an alternating current signal measuring device, a processing unit, a temperature measuring circuit and a temperature sensor.

[0007] The resonant circuit driving device and the alternating current signal measuring device are connected with the processing unit;

[0008] The resonant circuit driving device is connected with the inductor coil device to drive the inductor coil device to generate an initial alternating current signal;

[0009] In the case that the metal tank body appears in the preset radiation range of the inductor coil device, the parameters of the initial alternating current signal change to form a target alternating current signal;

[0010] The alternating current signal measuring device is connected with the inductive coil device to receive the target alternating current signal and deliver the target alternating current signal to the processing unit.

[0011] The processing unit is used for material analysis of the metal tank according to the received target alternating current signal.

[0012] The temperature measuring circuit is connected with the temperature sensor and the processing unit, and the temperature sensor is used for detecting the temperature of the liquid in the metal tank.

[0013] When the metal tank is in the preset radiation range, the temperature sensor abuts against the side wall of the metal tank.

[0014] The inductive coil device comprises a heating film, a first coil arranged on the front of the heating film, a second coil arranged on the back of the heating film, a via hole and a finger device; the first coil and the second coil are connected through the via hole, the first coil and the second coil are connected with the finger device, and the finger device is connected with the resonant circuit driving device and the alternating current signal measuring device.

[0015] In an embodiment of the utility model, based on aforementioned scheme, the resonant circuit driving device comprises digital analog converter and first amplifier, digital analog converter is connected with processing unit and first amplifier, and first amplifier is connected with inductive coil device.

[0016] In an embodiment of the utility model, based on aforementioned scheme, the inductive coil device comprises first electric capacity and coil device, first electric capacity is connected with first amplifier, coil device and alternating current signal measuring device.

[0017] In an embodiment of the utility model, based on aforementioned scheme, the alternating current signal measuring device comprises second electric capacity, second amplifier and comparator, second electric capacity is connected with first electric capacity, first amplifier and second amplifier, second amplifier is connected with comparator, and comparator is connected with processing unit.

[0018] In an embodiment of the utility model, based on aforementioned scheme, the liquid detecting device in the metal tank further comprises heating device, and the heating device is connected with the inductive coil device.

[0019] In an embodiment of the utility model, based on aforementioned scheme, the heating film is provided with an opening, and the temperature sensor is arranged in the opening.

[0020] The utility model discloses beneficial effect is: through resonance circuit drive arrangement drive the inductance coil device produces initial ac signal, under the condition that the inductance coil device's preset radiation range appears metal can body, the parameter of initial ac signal changes to form target ac signal. Through ac signal measuring device with the inductance coil device is connected to receive target ac signal and conveys target ac signal to the processing unit, so that processing unit can judge the material quality of metal can body according to the parameter change between target ac signal and initial ac signal. On the basis of knowing the material quality of metal can body, through temperature sensor and temperature measurement circuit to send the temperature of the liquid in the metal can body detected to processing unit, and processing unit can accurately judge whether the liquid in the metal can body is dangerous liquid by the temperature detected in combination with the material quality of metal can body.

[0021] Further, the structure of the inductance coil device is a heating film, a first coil arranged on the front of the heating film, a second coil arranged on the back of the heating film, a via hole, and a finger device. The first coil and the second coil are connected through the via hole, and the first coil and the second coil are connected with the finger device. The finger device is connected with the resonance circuit drive device and the ac signal measuring device. The structure of the inductance coil device is simple in design and low in structure cost. It can not only distinguish the material quality of the metal can body, but also accurately judge whether the liquid in the metal can body is a dangerous liquid, solving the problems and pain points existing in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed in the embodiment description will be briefly described below. Obviously, the described drawings are only part of the embodiments of the utility model, not all embodiments, and those skilled in the art can obtain other design schemes and drawings according to these drawings without creative labor.

[0023] Figure 1 It is the overall logic block diagram of the metal can body internal liquid detection device shown in the embodiment of the utility model;

[0024] Figure 2 It is the specific circuit diagram of the metal can body internal liquid detection device shown in the embodiment of the utility model;

[0025] Figure 3 It is the structure diagram of the inductance coil device shown in the embodiment of the utility model;

[0026] Figure 4 It is the logic schematic diagram of temperature detection and analysis of liquid shown in the embodiment of the utility model;

[0027] Figure 5 Fig. 1 is a schematic diagram of detection logic implemented based on a coil-shaped heating wire according to an embodiment of the present application;

[0028] Figure 6 Fig. 2 is a schematic diagram of detection logic implemented based on a heating wire and a coil layer according to an embodiment of the present application.

[0029] Reference signs

[0030] Inductive coil device 100, heating film 101, first coil 102, second coil 103, via hole 104, finger device 105, opening 106, resonant circuit driving device 200, alternating current signal measuring device 300, processing unit 400, temperature measuring circuit 500, temperature-sensitive sensor 600, heating device 700, metal can 800. DETAILED DESCRIPTION

[0031] Example implementations are now described with reference to the drawings; however, these implementations are merely examples of implementations and are not intended to limit the scope of the present application. Rather, the present application as can be best implemented by practicing the present application in its aspects in the claims.

[0032] Moreover, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the

[0033] The block diagrams in the drawings show only the functionality of the embodiments and do not imply any particular physical or architectural arrangement of the devices, systems, or methods. No inference should be drawn regarding the implementational aspects of the embodiments as shown and described herein. Further, having described a few illustrative embodiments, it will be recognized by those of skill in the art that variations in form and detail can be made to the embodiments without departing from the spirit of the application. For example, although the embodiments have been described in the context of a single device, it should be recognized that the embodiments can be implemented in a distributed format, where the functionality of a single device is spread across multiple devices, or where the functionality of a single device is spread across multiple networked devices.

[0034] The flow diagrams in the drawings show the functionality of the embodiments and do not imply a particular physical or architectural arrangement of the devices, systems, or methods. No inference should be drawn regarding the implementational aspects of the embodiments as shown and described herein. Further, having described a few illustrative embodiments, it will be recognized by those of skill in the art that variations in form and detail can be made to the embodiments without departing from the spirit of the application. For example, although the embodiments have been described in the context of a single device, it should be recognized that the embodiments can be implemented in a distributed format, where the functionality of a single device is spread across multiple devices, or where the functionality of a single device is spread across multiple networked devices.

[0035] It should be noted that the "multiple" referred to in this paper refers to two or more than two. The association between the associated objects is described as "and / or", which means that there can be three relationships, for example, A and / or B can represent three cases: A exists alone, A and B exist together, and B exists alone. The character " / " generally represents a "or" relationship between the front and rear associated objects.

[0036] The background art of the present utility model is described in detail as follows:

[0037] The detection of bottled dangerous liquids is widely used in the field of public safety. For metal canned liquids, the thermal conductivity measurement method is currently used, that is, by heating the tank body and detecting the nearby tank body temperature rise curve to determine whether the internal liquid is water or dangerous liquid such as gasoline. Commonly drinkable is water, which has a large specific heat capacity, and under the same heating power condition, the tank body temperature rises slowly. For dangerous liquids such as gasoline, the specific heat capacity is smaller than that of water, so the temperature rises quickly. By measuring the temperature rise curve, it can be determined whether the liquid in the tank is dangerous or safe.

[0038] The metal tank body of the commonly used canned cola, rice pudding, Wang Laoji and other beverages is usually made of iron or aluminum. The thickness and thermal conductivity of the tank body made of iron and aluminum are different, resulting in a difference in temperature rise curve when the same liquid is filled and the same heating power is applied. It is necessary to detect the tank body material to determine whether it is aluminum or iron, so that different parameters can be used in the subsequent software algorithm to improve the accuracy of measurement.

[0039] For the current mature scheme, a proximity sensor is installed near the heating device and the temperature measuring device, and a ferromagnetic or non-ferromagnetic eddy current sensor is installed. When the proximity sensor senses that an object is close, the measurement is started, and the output of the eddy current sensor is checked at the same time to determine whether it is an iron tank or an aluminum tank.

[0040] In summary, the traditional method has three disadvantages. First, the sensor installation and heating are not at the same position, which may cause errors when measuring some special-shaped tank bodies, such as the positions of the ferromagnetic and non-ferromagnetic eddy current sensors, and the diameter of the tank body becomes smaller. At this time, the sensor is too far away from the tank body and may not be sensed. This leads to incorrect signals from the sensor, affecting the accuracy of the measurement. The second disadvantage is that the sensor is mostly digital output, which can only output 1 or 0, which may not jump when the tank body is placed for measurement. At this time, manual measurement is required, which is not user-friendly, and the tank body may be removed by the user during the heating process, and the sensor also does not have a level jump. This will cause the heating device to continue heating after losing the load, resulting in overheating of the heating device and damage to the heating device.

[0041] Therefore, the metal tank internal liquid detection device and the control method thereof have the advantages that the metal tank internal liquid detection device has the functions of heating, temperature measurement and metal tank material judgment, the material of the metal tank 800 and the close state are sensed by continuously monitoring the parameter of the alternating current signal measurement device 300 (because the metal tank 800 appears in the preset radiation range of the inductor coil device 100, the parameter changes), the heating device 700 is started to measure after being stable, the measurement of the dangerous liquid is completed at a single point, the metal tank internal liquid detection device has the advantages of simple structure, low cost, rapid response and accurate measurement result.

[0042] The implementation details of the technical solutions of the embodiments of the utility model are described in detail as follows:

[0043] According to an aspect of the embodiments of the utility model, a metal tank internal liquid detection device is provided, as shown in Figure 1 、 Figure 2 and Figure 3 , a structural block diagram of the metal tank internal liquid detection device is shown in Figure 1 , a specific circuit diagram of the metal tank internal liquid detection device is shown in Figure 2 , and a structural diagram of the inductor coil device 100 is shown in Figure 3 .

[0044] The metal tank internal liquid detection device comprises an inductor coil device 100, a resonant circuit driving device 200, an alternating current signal measurement device 300, a processing unit 400, a temperature measurement circuit 500 and a temperature-sensitive sensor 600.

[0045] The resonant circuit driving device 200 and the alternating current signal measurement device 300 are connected with the processing unit 400.

[0046] The resonant circuit driving device 200 is connected with the inductor coil device 100 to drive the inductor coil device 100 to generate an initial alternating current signal.

[0047] In the case that the metal tank 800 appears in the preset radiation range of the inductor coil device 100, the parameter of the initial alternating current signal changes to form a target alternating current signal.

[0048] The alternating current signal measurement device 300 is connected with the inductor coil device 100 to receive the target alternating current signal and transmit the target alternating current signal to the processing unit 400.

[0049] The processing unit 400 is used for performing material analysis on the metal tank 800 according to the received target alternating current signal.

[0050] The temperature-sensitive sensor 600 is arranged in the preset radiation range, and the temperature measuring circuit 500 is connected with the temperature-sensitive sensor 600 and the processing unit 400, and the temperature-sensitive sensor 600 is used for detecting the temperature of the liquid in the metal tank body.

[0051] When the metal tank body is in the preset radiation range, the temperature-sensitive sensor is in abutment with the side wall of the metal tank body.

[0052] The inductance coil device 100 includes a heating film 101, a first coil 102 arranged on the front surface of the heating film 101, a second coil 103 arranged on the back surface of the heating film 101, a via hole 104, and a finger device 105. The first coil 102 and the second coil 103 are connected through the via hole 104, and the first coil 102 and the second coil 103 are connected with the finger device 105. The finger device 105 is connected with the resonant circuit driving device 200 and the alternating current signal measuring device 300.

[0053] Specifically, the inductance coil device 100 is driven by the resonant circuit driving device 200 to generate an initial alternating current signal. When the metal tank body appears in the preset radiation range of the inductance coil device 100, the parameters of the initial alternating current signal change to form a target alternating current signal. The alternating current signal measuring device 300 is connected with the inductance coil device 100 to receive the target alternating current signal and transmit the target alternating current signal to the processing unit 400, so that the processing unit 400 can determine the material of the metal tank body according to the parameter change between the target alternating current signal and the initial alternating current signal. On the basis of knowing the material of the metal tank body, the temperature of the liquid in the metal tank body detected by the temperature-sensitive sensor 600 and the temperature measuring circuit 500 is sent to the processing unit 400. The processing unit 400 can accurately determine whether the liquid in the metal tank body is a dangerous liquid by combining the detected temperature with the material of the metal tank body.

[0054] Further, the structure of the inductance coil device 100 is a heating film 101, a first coil 102 arranged on the front surface of the heating film 101, a second coil 103 arranged on the back surface of the heating film 101, a via hole 104, and a finger device 105. The first coil 102 and the second coil 103 are connected through the via hole 104, and the first coil 102 and the second coil 103 are connected with the finger device 105. The finger device 105 is connected with the resonant circuit driving device 200 and the alternating current signal measuring device 300. The structure design of the inductance coil device 100 is simple and the structure cost is low. It can not only determine the material of the metal tank body, but also accurately determine whether the liquid in the metal tank body is a dangerous liquid, solving the problems and pain points existing in the prior art.

[0055] Specifically, in Figure 3 , the first coil 102 is a green coil, the second coil 103 is a yellow coil, and the first coil 102 and the second coil 103 are arranged on two sides (i.e. the front side and the back side) of the heating film 101 respectively.

[0056] Further, the resonance circuit driving device 200 comprises a digital-to-analog converter and a first amplifier, the digital-to-analog converter is connected with the processing unit 400 and the first amplifier, and the first amplifier is connected with the inductive coil device 100. The inductive coil device 100 comprises a first capacitor and a coil device, the first capacitor is connected with the first amplifier, the coil device and the alternating current signal measuring device 300, the alternating current signal measuring device 300 comprises a second capacitor, a second amplifier and a comparator, the second capacitor is connected with the first capacitor, the first amplifier and the second amplifier, the second amplifier is connected with the comparator, and the comparator is connected with the processing unit 400.

[0057] As Figure 2 indicated, the digital-to-analog converter is DAC (Digital to Analog Converter) in Figure 2 , the first amplifier is A1 in Figure 2 , the inductive coil device 100 is the first capacitor C1 and the coil device L in Figure 2 , and the initial alternating current signal generated by the resonance circuit driving device 200 and the first amplifier can drive the resonance circuit composed of the first capacitor C1 and the coil device L to generate a new alternating current signal which enters the comparator, i.e. COMP (Comparator) in Figure 2 , after passing through the second capacitor C2 and the second amplifier A2, and the processing unit 400 can obtain the alternating current signal once every certain period, if the metal can appears in the preset radiation range of the inductive coil device 100, then the parameter of the alternating current signal will certainly change, and the material of the metal can can be judged by analyzing the parameter change. In the embodiment of the utility model, when the metal can enters the preset radiation range of the inductive coil device 100, the alternating current signal formed at this time is the target alternating current signal, at this time, the phase difference between the target alternating current signal and the initial alternating current signal, compared with the phase difference between the alternating current signal obtained when no metal can appears in the preset radiation range and the initial alternating current signal, through the change of the phase difference, the metal can can be judged to be iron or aluminum or other materials.

[0058] An initial AC signal is applied to the inductor device 100. An alternating magnetic field is generated around the inductor device 100. If an aluminum metal can is close to the inductor device 100, the aluminum is paramagnetic and has little change to the magnetic field, but has a relatively large area crossing the magnetic lines. Therefore, an eddy current signal is induced. The eddy current signal induces a magnetic field. The direction of the magnetic field is opposite to the direction of the inductor device 100, so that the total alternating magnetic field passing through the inductor device 100 is reduced. If the excitation AC voltage is unchanged, the current passing through the inductor device 100 will be increased; when an iron metal can is close to the inductor device 100, the ferromagnetic property greatly enhances the original coil magnetic field. The impedance of the inductor device 100 is increased. If the excitation AC voltage is unchanged, the current of the inductor device 100 will be significantly reduced if only the ferromagnetic property is considered. Of course, the iron can also has an eddy current effect, which generates a magnetic field opposite to the coil, reducing the ferromagnetic property.

[0059] Based on the above analysis, by analyzing the amplitude and phase changes of the AC signal on the inductor device 100, the materials of different metal cans can be distinguished. It should be noted that the processing unit 400 can be a processor or a controller, Figure 2 、 Figure 5 and Figure 6 The measured can in the above is the metal can described in the embodiments of the present application.

[0060] In one example, the processing unit 400 controls the DAC to output a sine wave with a frequency f0. After being driven by the first amplifier A1, a sine wave with an initial phase angle φ0 is obtained. The LC resonant circuit composed of C1 and L is driven, where L is the inductor device 100. The inductor device 100 can be a coil-shaped heating wire or a coil and a heating wire stacked together to form a coil. The sampling point of the phase detection is the connection point of the first capacitor C1 and the coil device L. After being coupled by the second capacitor C2, the signal is sent to the operational amplifier A2 for amplification, and then a rectangular wave with a frequency f0 and a phase angle φ1 is obtained by the comparator COMP. In this way, the phase difference Δφ = φ0-φ1, and φ0 is fixed under the condition of the circuit parameters. Under the current circuit parameters, when no metal can is detected, Δφ0 = 6.9°. When an iron metal can enters the preset radiation range, the phase difference becomes Δφ1 = 2.8°, and the φ1 phase is shifted forward by 4.1°. When an aluminum metal can enters the preset radiation range, the phase difference becomes Δφ2 = 17.2°, and the φ1 phase is shifted backward by 10.3°. The specific phase shift size is related to the circuit parameters, and also has a certain relationship with the diameter and thickness of the can. However, the trend of the change is consistent. In general, if the φ1 phase is shifted forward, it means that the metal can is iron; if the φ1 phase is shifted backward, it means that the metal can is aluminum.

[0061] The software continuously monitors the parameter of delta phi, and when the tank body approaches the coil to prepare for measurement, for example, the software monitors that the delta phi decreases by 2 degrees or increases by 10 degrees and is stable for 10 sampling periods, and then the heating measurement is started. During the measurement, the change of the delta phi is detected, for example, the sampling value is greater than 0.5 degrees than the last change, which indicates that the position of the tank body is changed, and the heating and temperature measurement condition is changed suddenly, and it can be judged that the measurement result is inaccurate. The processing unit can immediately control the heating device to stop heating, and the heating film 101 is protected from damage. In summary, the circuit design is simple, safe to use, low in cost, and effectively improves the product competitiveness.

[0062] Further, the detection device of the liquid in the metal tank body further comprises a heating device 700 connected with the inductance coil device 100.

[0063] Specifically, the parameter value of the temperature sensitive sensor 600 is measured at intervals and measured at intervals, and whether the metal tank body approaches is judged by the obtained eddy current parameter. When the tank body approaches, whether the eddy current parameter is stable is detected, and when the metal tank body is stable, the heating device 700 is started to heat. During the heating process, it is continuously judged whether the eddy current parameter changes. If the eddy current parameter is checked to have a mutation, the heating is immediately turned off and the temperature measurement is stopped. If there is no change, the heating is stopped after the set time. The processor processes the temperature change curve in this period, and finally judges whether the liquid in the metal tank body is a dangerous liquid or a safe liquid based on the material characteristics of the metal tank body.

[0064] Further, the heating film 101 is provided with an opening 106, and the temperature sensitive sensor 600 is arranged in the opening 106.

[0065] Specifically, as shown in Figure 3 , the opening 106 in the heating film 101 is provided with the temperature sensitive sensor 600. Figure 3 The temperature measurement circuit 500 connected with the temperature sensitive sensor 600 is not shown in Figure 3 .

[0066] Specifically, the temperature detection specific logic diagram provided by the embodiment of the present application can be referred to as shown in Figure 4 . Figure 4 It needs to be explained that Figure 4The logic flowchart in the figure is only for facilitating the understanding of those skilled in the art, and is not the content to be protected by the utility model. The parameter value of the temperature-sensitive sensor 600 is measured once every period of time (obtained through the temperature detection signal described in the embodiment of the utility model), and the eddy current parameter (obtained through the temperature detection signal described in the embodiment of the utility model) is used to determine whether there is a metal tank body close by. When there is a tank body close by, the eddy current parameter is detected to determine whether it is stable. When it is stable, it represents that the metal tank body has been placed stably, and the heating device 700 is started to heat. During the heating process, it is continuously determined whether the eddy current parameter changes. If it is found that the eddy current parameter (the eddy current parameter refers to the phase difference Δφ) has a mutation (that is, the change value of the phase difference in a period of time is greater than a preset change threshold value), the heating is immediately turned off and the temperature measurement is stopped. The change threshold value can be set according to actual needs, and in the utility model, the change threshold value is 0.5°. If there is no change, the heating is stopped after the set time. The temperature change curve (that is, the temperature change rate) in this period is processed by the processor, and based on the material characteristics of the metal tank body, it is finally determined whether the liquid in the metal tank body is a dangerous liquid or a safe liquid. The preset change rate threshold value can be set according to actual needs. As long as the temperature change rate is large, it indicates that the liquid warms up quickly, which represents that the specific heat capacity of the liquid is small, and at this time, it can be determined that the liquid is a dangerous liquid.

[0067] Further, as shown in Figure 5 , the inductance coil device 100 of the utility model can be a heating wire wound into a coil shape, has a certain inductance and resistance value, and can heat the metal tank body by passing in a direct current signal. When there is a metal tank body around, the alternating current of the coil-shaped heating wire will change, and through measurement and analysis, it can be determined whether the metal tank body is an iron tank or an aluminum tank.

[0068] As shown in Figure 6 , Figure 6 , another implementation mode of the inductance coil device 100 of the utility model, the heating wire and the coil are separated and superimposed together. For example, a double-sided FPC (Flexible Printed Circuit, flexible circuit board) is used to realize this. A heating resistance wire is designed on the side close to the metal tank body, and the other side of the FPC is designed into a coil. The temperature-sensitive sensor 600 is arranged in the middle of the coil. In this way, the circuit implementation is simple, and direct current isolation and alternating current isolation are not required.

[0069] In summary, the utility model discloses a resonant circuit drive device 200 drive the inductance coil device 100 produces initial ac signal, in the preset radiation range of inductance coil device 100, the parameter of initial ac signal changes to form target ac signal under the condition of the emergence of metal can body. Through the inductance coil device 100 is connected with ac signal measuring device 300, to receive target ac signal and send target ac signal to processing unit 400, so that processing unit 400 can judge the material of metal can body according to the parameter change between target ac signal and initial ac signal. On the basis of knowing the material of metal can body, through temperature sensor 600 and temperature measuring circuit 500 to send the temperature of the liquid in the metal can body detected to processing unit 400, and processing unit 400 can accurately judge whether the liquid in the metal can body is dangerous liquid through the detected temperature and the material of metal can body.

[0070] Further, the structure of inductance coil device 100 is heating film 101, first coil 102 arranged at the front of heating film 101, second coil 103 arranged at the back of heating film 101, via 104 and finger device 105, first coil 102 and second coil 103 are connected through via 104, first coil 102 and second coil 103 are connected with finger device 105, finger device 105 is connected with resonant circuit drive device 200 and ac signal measuring device 300. The structure design of inductance coil device 100 is simple, and the structure cost is lower, can judge whether the liquid in the metal can body is dangerous liquid while having the ability of distinguishing the material of metal can body, solves the existing problems and pain points of prior art.

[0071] In addition, the above-mentioned figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, and are not for limiting purposes. It is easy to understand that the processes shown in the above-mentioned figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be executed synchronously or asynchronously in multiple modules.

[0072] It should be understood that the present application is not limited to the precise construction which has been described above and illustrated in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the application is limited only by the claims that follow.

Claims

1. A device for detecting a liquid inside a metal can body, characterized by comprising: The detection device for the liquid in the metal can body comprises an inductor coil device, a resonant circuit driving device, an alternating current signal measuring device, a processing unit, a temperature measuring circuit and a temperature-sensitive sensor; The resonant circuit driving device and the alternating current signal measuring device are connected with the processing unit; The resonant circuit driving device is connected with the inductor coil device to drive the inductor coil device to generate an initial alternating current signal; In the case that the metal can body appears in the preset radiation range of the inductor coil device, the parameters of the initial alternating current signal change to form a target alternating current signal; The alternating current signal measuring device is connected with the inductor coil device to receive the target alternating current signal and transmit the target alternating current signal to the processing unit; The processing unit is used for material analysis of the metal can body according to the received target alternating current signal; The temperature-sensitive sensor is arranged in the preset radiation range, the temperature measuring circuit is connected with the temperature-sensitive sensor and the processing unit, and the temperature-sensitive sensor is used for detecting the temperature of the liquid in the metal can body; When the metal can body is in the preset radiation range, the temperature-sensitive sensor abuts against the side wall of the metal can body. The inductor coil device comprises a heating film, a first coil arranged on the front of the heating film, a second coil arranged on the back of the heating film, a via hole and a finger device; the first coil and the second coil are connected through the via hole, the first coil and the second coil are connected with the finger device, and the finger device is connected with the resonant circuit driving device and the alternating current signal measuring device.

2. The metal can body internal liquid detection device according to claim 1, characterized by The resonant circuit driving device comprises a digital-to-analog converter and a first amplifier, the digital-to-analog converter is connected with the processing unit and the first amplifier, and the first amplifier is connected with the inductor coil device.

3. The metal can body internal liquid detection device according to claim 2, characterized by The inductor coil device comprises a first capacitor and a coil device, the first capacitor is connected with the first amplifier, the coil device and the alternating current signal measuring device.

4. The metal can body internal liquid detecting apparatus according to claim 3, wherein The alternating current signal measuring device comprises a second capacitor, a second amplifier and a comparator, the second capacitor is connected with the first capacitor, the first amplifier and the second amplifier, the second amplifier is connected with the comparator, and the comparator is connected with the processing unit.

5. The metal can internal liquid detection apparatus according to claim 1, characterized by The detection device for the liquid in the metal can body further comprises a heating device, and the heating device is connected with the inductor coil device.

6. The metal can internal liquid detection apparatus according to claim 1, wherein The heating film is provided with an opening, and the temperature-sensitive sensor is arranged in the opening.

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