Electric signal automatic detection equipment of alcohol sensor

Abstract

The electric signal automatic detection equipment comprises an equipment machine table, a sample device, an automatic clamping device, an automatic conveying device, a gas circuit connecting device, a test gas generating device, an ethanol electrochemical analysis device, an automatic screening device, a display panel and a controller, an automatic clamping device, an automatic conveying device and an automatic screening device are sequentially arranged on the equipment machine table. The automatic clamping device is used for clamping a sample device filled with a sample to be detected and placing the sample device on the automatic conveying device, and the gas circuit connecting device and the ethanol electrochemical analysis device are both communicated with the sample to be detected for detection; and unqualified products in the detected samples are screened out through an automatic screening device. According to the invention, standard gases with different concentrations can be continuously generated, the raw material cost is greatly reduced, the switching work of sensor sample injection can be automatically carried out, and the quality control cost of manpower is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of detection equipment of alcohol sensors, and specifically refers to an automatic detection equipment for electrical signals of alcohol sensors. Background Art

[0003] As the core component of alcohol detection equipment, the working principle of alcohol sensor mainly depends on the interaction between the measured alcohol molecules and the sensor material. Specifically, the intensity of the sensor output signal generally shows a certain relationship with the concentration of alcohol molecules in the measured gas. Electrochemical alcohol sensor is a sensor that uses electrical signals as a sensor to evaluate the alcohol concentration in the measured gas. At present, the sensors of police breath alcohol content detectors used in law enforcement are mostly electrochemical. The principle of this type of electrochemical sensor is that alcohol molecules undergo redox reactions on the electrode surface, and alcohol molecules release electrons to flow through the external circuit to the counter electrode, and the current intensity generated is detected to achieve accurate measurement of alcohol gas concentration. The key to the performance of electrochemical sensors is that their membrane electrodes can generate electrical signals proportional to the concentration of alcohol gas. In the production process, the sensor membrane electrode is made by coating the catalyst ink on the partition through screen printing technology, but this process is difficult to ensure the complete uniform distribution of the ink. Therefore, in order to ensure that the performance of mass-produced electrochemical sensors meets the expected requirements, each assembled sensor sample needs to undergo corresponding working performance tests before leaving the factory to ensure that the electrical signals they generate when responding to alcohol gas meet the established performance requirements. Only qualified sensors that have passed the screening will be embedded in the corresponding housing to be assembled into an alcohol tester. This quality control process ensures that the electrochemical sensor, the core component of the alcohol tester, can provide accurate and reliable detection values.

[0004] In the traditional electrochemical sensor performance evaluation process, the sensor first needs to be connected to a specific electrochemical analysis instrument through an electrical conductor. After ensuring that the connection is stable and reliable, the sensor sample is continuously purged with an airflow of ethanol standard gas of different concentrations in a simulated actual use environment. During this process, a redox reaction will occur inside the sensor and the corresponding electrical signal will be output. These electrical signals are captured by the electrochemical analysis instrument and converted into readable electrical parameters. When the strength of the identified electrical signal is within a specific range, it can be considered that the performance of the sensor sample meets the standard. At the same time, acetone gas is also an important interfering gas for this type of sensor. Its impact on the performance of the sensor should be evaluated. If there is no impact, the performance of the entire device can be determined to be qualified. The traditional method requires the sensor to be installed in the equipment for performance testing, which increases the possibility of rework to a certain extent.

[0005] In the traditional test process of electrochemical sensors, manual operation occupies a dominant position, which not only involves cumbersome gas circuit and circuit interface connections, but also significantly increases labor costs. Manual operation makes it difficult to ensure that the purge time of each sensor sample is completely consistent, affecting the accuracy and repeatability of the test results. At the same time, ethanol standard gas needs to be continuously used for purging during the test process, which is costly and poses a challenge to cost control. Furthermore, traditional methods can usually only test standard gases of a single concentration, which means that when it is necessary to evaluate the electrical signal response of the sensor to gases of different concentrations, standard gases of multiple concentrations must be prepared as gas sources for testing, which not only increases economic costs, but may also affect the airtightness of some sensors during the test process due to the cumbersomeness of the gas circuit switching operation, reduce the accuracy of the test results, and may cause qualified products to be misjudged as unqualified products, further increasing costs. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an automatic detection device for the electrical signal of an alcohol sensor. The device uses ambient air, anhydrous ethanol and anhydrous acetone as raw materials, and can continuously produce standard gases of different concentrations, which greatly reduces the raw material cost of batch detection of sensor samples. At the same time, during the test process, the sensor sample injection switching work can be automatically performed, and the sensor samples to be tested can be automatically screened, which greatly reduces the manpower quality control cost.

[0007] The present invention is achieved in that:

[0008] An automatic detection device for electrical signals of an alcohol sensor, comprising: an equipment platform, a sample device, an automatic clamping device, an automatic conveying device, a gas circuit connection device, a test gas generating device, an ethanol electrochemical analysis device, an automatic screening device, a display panel and a controller;

[0009] The automatic clamping device, the automatic conveying device, and the automatic screening device are sequentially arranged on the equipment platform;

[0010] The gas circuit connection device is located beside the automatic conveying device; the number of the gas circuit connection devices is four, which are respectively connected to the test gas generating device and the ethanol electrochemical analysis device;

[0011] The sample device is located below the automatic clamping device;

[0012] The automatic gripping device, the automatic conveying device, the gas circuit connection device, the test gas generating device, the ethanol electrochemical analysis device, the automatic screening device and the display panel are respectively connected to the controller;

[0013] The automatic clamping device clamps the sample device containing the sample to be tested and places it on the automatic conveying device. The gas circuit connection device and the ethanol electrochemical analysis device are both connected to the sample to be tested for testing; unqualified products in the tested sample that have been tested are screened out by the automatic screening device.

[0014] Further, the test gas generating device includes: a purifier, an air compressor, a gas-liquid separator, a dryer, a control module, a first gas mixing tank, a second gas mixing tank, a third gas mixing tank, a fourth gas mixing tank, a first flow splitter, a second flow splitter, a third flow splitter, a fourth flow splitter, a fifth flow splitter, a thermostat, an acetone diffuser, an ethanol diffuser, an ethanol detector, a first gas path port, a second gas path port, a third gas path port, and a fourth gas path port;

[0015] The purifier, the air compressor, the gas-liquid separator, and the first gas mixing tank are connected in sequence; the purifier is connected to the air inlet through the first gas valve, one end of the first gas mixing tank is connected to the exhaust port through the second gas valve, and the other end is divided into three main gas paths after passing through a pressure stabilizing valve, including: a first main gas path, a second main gas path, and a third main gas path; a first pressure gauge is provided between the first gas mixing tank and the second gas valve, and the air compressor is connected to the first pressure gauge through a control module; the gas-liquid separator is connected to the drain port through a water stop valve;

[0016] The first main gas path is used to output clean air, and includes: a third gas valve, a first flow controller, a first three-way valve, and a first gas path port connected in sequence; the first three-way valve is provided between the first flow controller and the first gas path port, and the first three-way valve is connected to the gas outlet;

[0017] The second main gas path is used to output the acetone standard gas, and includes: a fourth gas valve and a first flow divider connected in sequence, the other end of the first flow divider is divided into two branch gas paths, one gas path passes through a third flow controller and an acetone diffuser in sequence and flows to the second gas storage tank, and the other gas path passes through the second flow controller and flows to the second gas storage tank, the other end of the second gas storage tank is connected to the second flow divider, and a second pressure gauge is provided on the gas path passing through, which is used to monitor the gas pressure of the second gas storage tank, and the other end of the second flow divider is further divided into two branch gas paths, one branch gas path passes through an eighth flow controller, a second three-way valve, and a second gas path port in sequence, and the second three-way valve changes the gas flow direction to the gas outlet, and the other branch gas path flows to the sixth one-way valve and then flows to the gas outlet;

[0018] The third main gas path is used to output ethanol standard gas, including: a fifth gas valve and a third flow divider connected in sequence, the other end of the third flow divider is divided into three branches, including a first branch, a second branch, and a third branch, the first branch and the second branch are used to prepare high-concentration ethanol gas, and the third branch is used to prepare low-concentration ethanol gas;

[0019] The first branch flows to the third gas storage tank through the fourth flow controller and the ethanol diffuser in sequence;

[0020] The second branch flows to the third gas tank through the fifth flow controller, the gas in the third gas tank flows to the fourth flow divider and then is divided into three small branches, a third pressure gauge is provided between the third gas tank and the fourth flow divider to monitor the air pressure of the third gas tank, the first small branch flows to the fourth gas tank through the tenth flow controller, the second small branch passes through the ninth flow controller, the fifth three-way valve, the third three-way valve, and the third gas path port in sequence, the fifth three-way valve can change the gas flow direction to the ethanol detector, the third three-way valve can change the gas flow direction to the gas outlet, and the third small branch flows to the gas outlet after passing through the seventh one-way valve;

[0021] The third branch flows to the fourth gas tank through the sixth flow controller, the gas in the fourth gas tank flows to the fifth diverter, a fourth pressure gauge is provided between the fourth gas tank and the fifth diverter to monitor the gas pressure of the fourth gas tank, the other end of the fifth diverter is further divided into two small branch gas paths, one small branch gas path passes through the seventh flow controller, the sixth three-way valve, the fourth three-way valve, and the fourth gas path port, the sixth three-way valve can change the gas flow direction to the ethanol detector, the fourth three-way valve can change the gas flow direction to the gas outlet, and another small branch gas path flows to the eighth one-way valve and then flows to the gas outlet; the other end of the ethanol detector flows to the gas outlet after passing through the fifth one-way valve;

[0022] During the test, the gas path of the first gas path port passes through the sensor sample under test, passes through the first one-way valve, and then flows to the gas outlet; the gas path of the second gas path port passes through the sensor sample under test, passes through the second one-way valve, and then flows to the gas outlet; the gas path of the third gas path port passes through the sensor sample under test, passes through the third one-way valve, and then flows to the gas outlet; the gas path of the fourth gas path port passes through the sensor sample under test, passes through the fourth one-way valve, and then flows to the gas outlet;

[0023] The first to fifth gas valves, the pressure-stabilizing valve, the first to sixth three-way valves, and the first to fourth pressure gauges are all electrically connected to the controller and the display panel;

[0024] The acetone diffuser and the ethanol diffuser are respectively placed in two temperature control systems in a thermostat, and the thermostat is connected to the display panel; the two temperature control systems monitor and control the temperatures of the acetone diffuser and the ethanol diffuser respectively.

[0025] Further, the number of the gas circuit and electric circuit connection devices is four;

[0026] Each of the gas circuit connection devices comprises: a moving block, a test plate, two brackets, a fixed block, a fixed cavity, a fixed column, a rolling slider, a spring mechanism, a telescopic rod, and a gas circuit tube; a circuit board connected to the ethanol electrochemical analysis device is provided on the inner side of one of the brackets;

[0027] The fixing column is arranged at the bottom of the fixing cavity, the rolling slider is arranged above the fixing column, the spring mechanism is arranged above the rolling slider, one end of the spring mechanism abuts against an inner side wall of the fixing cavity, and the other end is connected to one end of the telescopic rod passing through the other side wall of the fixing cavity, the other end of the telescopic rod is connected to the gas pipe, and the fixing block is arranged above the spring mechanism in the fixing cavity, and the fixing block is located below the test plate;

[0028] The upper part of the bracket is connected to the test plate; the upper part of the test plate is connected to the moving block, and the moving block moves downward under the action of the controller, driving the test plate to press down the fixed block, and the spring mechanism is forced to pull the air pipe to translate through the telescopic rod, so that the port at the L-shaped lower end of the air pipe is connected to the sample device.

[0029] Furthermore, the sample device comprises: a sensor sample to be tested and a sample plate; the sensor sample to be tested is embedded in the sample plate, one end of the sensor sample to be tested has an air inlet opening, the other end has an air outlet opening, the side has a line groove, and both sides of the sample plate have limit grooves.

[0030] Furthermore, the automatic clamping device includes: a moving column, a horizontal bar, a slide and a first clamp, the moving column is mounted on the horizontal bar, the slide includes: a fixed track and a sliding block, the fixed track is fixedly connected to the moving column, the sliding block is fixedly connected to the first clamp, the bottom of the first clamp has a first clamp for clamping the sample device, and the track direction of the fixed track is perpendicular to the direction of the horizontal bar.

[0031] Furthermore, the automatic conveying device includes: a conveyor belt and a roller, and the roller is arranged under the conveyor belt to drive the conveyor belt to operate.

[0032] Furthermore, the automatic screening device includes: a movable slider, a cross bar, a second clamp, and a conveyor belt. The movable slider is movably mounted on the cross bar, the movable slider and the second clamp are fixedly connected, and a second clamp is provided below the second clamp for clamping unqualified products onto the conveyor belt.

[0033] The advantages of the present invention are: electrochemical performance tests are performed on batches of sensor samples in different ways, and ethanol standard gas of different concentrations can be output for testing as needed, thereby improving work efficiency. At the same time, the raw material liquid replaces the standard gas in the testing process, which greatly reduces the use of the standard gas, saves gas source consumption, and improves economic efficiency. In addition, the ventilation time and flow rate are kept consistent during each test, so that the test results are more accurate. At the same time, automatic testing and automatic screening are performed throughout the process, which greatly saves labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0035] Figure 1 It is the front view of the present invention.

[0036] Figure 2 It is a left-side stereogram of the present invention.

[0037] Figure 3 It is a right side perspective view of the present invention.

[0038] Figure 4 It is a rear perspective view of the present invention.

[0039] Figure 5 It is a schematic diagram of the structure of the sample device in the present invention.

[0040] Figure 6 Schematic diagram of the test gas generating device of the present invention.

[0041] Figure 7 It is a schematic diagram of the connection relationship between the ethanol electrochemical analysis device in the present invention and other components.

[0042] Figure 8 It is a structural schematic diagram of the gas circuit connection device in the present invention.

[0043] Fig. 9 yes Figure 8 Longitudinal section view of .

[0044] Fig.10 It is a schematic diagram of the exploded structure of the gas circuit connection device in the present invention.

[0045] Fig.11 It is a schematic diagram of the exploded structure of the automatic clamping device in the present invention.

[0046] Fig.12 It is a schematic diagram of the exploded structure of the automatic screening device in the present invention.

[0047] Fig.13 It is a schematic diagram of the structure of the ethanol diffuser in the present invention. DETAILED DESCRIPTION

[0048] See also Figures 1 to 13 As shown, an automatic detection device for electrical signals of an alcohol sensor includes: an equipment platform 100, a sample device A, an automatic clamping device B, an automatic conveying device C, a gas circuit connection device D, an automatic screening device E, a test gas generating device F, an ethanol electrochemical analysis device G, a display panel 200 and a controller (not shown);

[0049] The equipment platform 100 is provided with an automatic clamping device B, an automatic conveying device C, and an automatic screening device E in sequence; a dust cover 300 is also provided above the equipment platform 100;

[0050] The gas circuit connection device D is located beside the automatic conveying device C; there are four gas circuit connection devices D, which are respectively connected to the test gas generating device F and the ethanol electrochemical analysis device G;

[0051] The sample device A is located below the automatic clamping device B;

[0052] The automatic gripping device B, the automatic conveying device C, the gas circuit connection device D, the test gas generating device F, the ethanol electrochemical analysis device G, the automatic screening device E and the display panel 200 are respectively connected to the controller;

[0053] The automatic clamping device B clamps the sample device A containing the sample to be tested and places it on the automatic conveying device C. The gas circuit connection device D and the ethanol electrochemical analysis device G are both connected to the sample to be tested for testing; unqualified products in the tested samples that have been tested are screened out by the automatic screening device E.

[0054] The sample device A includes: a sensor sample A1 to be tested and a sample plate A2. The sensor sample A1 to be tested is embedded in the sample plate A2. The sensor sample A1 to be tested has an air inlet opening A11 at one end and an air outlet opening A12 at the other end. The side has a line groove A13. The two sides of the sample plate A2 have limit grooves A21 respectively. The sample device A is stacked and arranged on the equipment machine 100 below the automatic clamping mechanism B.

[0055] The automatic clamping mechanism B includes: a moving column B1, a horizontal bar B2, a slide B3, and a first clamp B4. The moving column B1 is mounted on the horizontal bar B2 and can move under the action of the controller. The slide B3 includes: a fixed track B31 and a sliding block B32. The fixed track B31 is fixedly connected to the moving column B1, and the sliding block B32 is fixedly connected to the first clamp B4. The bottom of the first clamp B4 has a first gripper B5 for clamping the sample device A. The track direction of the fixed track B31 is perpendicular to the direction of the horizontal bar B2, so the clamp B4 can move in the up, down, left and right directions. The horizontal bar B2 is located above the sample device A and the automatic conveying device C.

[0056] The automatic conveying device C comprises: a conveyor belt C1 and a roller C2; the roller C2 drives the conveyor belt C1 to move forward, and drives the sample device A placed on the conveyor belt C1 to arrive at the gas circuit connection device D and stop.

[0057] Each gas circuit connection device D includes: a moving block D1, a test plate D2, two brackets D3 (with a stopper node D4), a fixed block D61, a fixed cavity D62, a fixed column D63, a rolling slider D64, a spring mechanism D65, a telescopic rod D66, and a gas circuit pipe D67;

[0058] A circuit board D5 connected to the ethanol electrochemical analysis device G is provided on the inner side of one of the brackets D3;

[0059] A fixed column D63 is arranged at the bottom of the fixed cavity D62, a rolling slider D64 is arranged above the fixed column D63, a spring mechanism D65 is arranged above the rolling slider D64, one end of the spring mechanism D65 abuts against an inner wall of the fixed cavity D62, and the other end is connected to one end of a telescopic rod D66 passing through the other side wall of the fixed cavity D62, the other end of the telescopic rod D66 is connected to the air pipe D67, and a fixed block D61 is arranged above the spring mechanism D65 in the fixed cavity D62, and the fixed block D61 is located below the test plate D2.

[0060] The upper part of the bracket D3 is connected to the test board D2; the upper part of the test board D2 is connected to the moving block D1, which moves downward under the action of the controller, driving the test board D2 to press down the fixed block D61, and the spring mechanism D65 is forced to pull the air pipe D67 to move horizontally through the telescopic rod D66, so that the port at the lower end of the L-shape is connected to the air outlet A12 of the side sensor sample A1. At the same time, the test board D2 presses down the bracket D3, and the bracket D3 on one side is inserted into the limiting groove A21 on one side of the sample board A2, and the bracket D3 with the circuit board D5 on the other side is inserted into the limiting groove A21 on the other side of the sample board A2 and connected to the line groove A13 of the sensor sample A1 to be tested.

[0061] There are four gas circuit connection devices D, which are used for zero point test, interference gas test, upper limit test of measurement range and standard measurement point test respectively. The first one-way valve S1, the second one-way valve S2, the third one-way valve S3 and the fourth one-way valve S4 are respectively connected to the top of the gas circuit connection devices D and then connected to the gas outlet Q4 in the test gas generating device F.

[0062] The ethanol electrochemical analysis device G is composed of four rows of parallel ethanol analysis modules, each of which can process signals independently, and each ethanol analysis module is connected to the corresponding circuit board D5 through an electrical circuit. When the circuit board D5 is in contact with the circuit slot A13, the electrical signal generated by the sensor sample A1 under test after passing through the ethanol gas can be transmitted to the ethanol electrochemical analysis device G through these electrical circuits. After receiving the electrical signals, the ethanol electrochemical analysis device G will process and analyze these signals to determine the concentration of the ethanol gas, and the analysis results will be displayed on the display panel 200 of the device, so that the user can intuitively read the analysis results of each sample.

[0063] The automatic screening mechanism E includes: a movable slider E1, a crossbar E2, a second clamp E3, and a conveyor belt E4. The movable slider E1 is movably mounted on the crossbar E2. The movable slider E1 is fixedly connected to the second clamp E3. The second clamp E3 has a second gripper E5 below to clamp unqualified products from the conveyor belt C1 and convey them to E4. The direction of the crossbar E2 is perpendicular to the direction of the crossbar B2, and the direction of the conveyor belt E4 is parallel to the direction of the conveyor belt C1.

[0064] The test gas generating device F includes: a purifier 1, an air compressor 2, a gas-liquid separator 3, a dryer 5, a control module 6, a first gas mixing tank 21, a second gas mixing tank 22, a third gas mixing tank 23, a fourth gas mixing tank 24, a first diverter F1, a second diverter F2, a third diverter F3, a fourth diverter F4, a fifth diverter F5, a thermostat 8, an acetone diffuser 81, an ethanol diffuser 82, an ethanol detector 9, a first gas path port 11, a second gas path port 12, a third gas path port 13, and a fourth gas path port 14.

[0065] The clean air in the environment enters from the air inlet Q1, then passes through the first air valve V1 and the purifier 1, and enters the air compressor 2. The air compressor 2 can continuously generate gas at a certain pressure, and a small amount of water will be generated after long-term operation. The generated gas then enters the gas-liquid diverter 3, which will separate water and air. The water generated during the separation process will temporarily accumulate at the bottom of the gas-liquid separator 3. After the test is completed, it can be separated through the water stop valve 4 and discharged from the drain port Q2. The separated air passes through the dryer 5 and enters the first gas mixing tank 21. The first pressure gauge P1 is used to detect the gas pressure in the gas mixing tank 21. The control module 6 is connected to the first pressure gauge P1 and the gas mixing tank 21 through an electrical circuit. If the first gas mixing tank 21 needs to be deflated, it can flow out from the exhaust port Q3 through the second air valve V2.

[0066] The gas in the first gas mixing tank 21 is divided into three main gas paths after passing through the pressure regulating valve 7:

[0067] 1) The first main gas circuit is used to output air (for zero point testing). The gas in this gas circuit passes through the third gas valve V3, the first flow controller M1, and the first gas circuit port 11 in sequence. A first three-way valve W1 is also provided between the first flow controller M1 and the first gas circuit port 11. The first three-way valve W1 can change the direction of the gas flow to the gas outlet Q4.

[0068] 2) The second main gas path is used to output acetone standard gas (for interfering gas testing). The gas in this gas path passes through the fourth gas valve V4 and the first diverter F1 in sequence, and then is divided into two branch gas paths. One gas path passes through the third flow controller M3 and the acetone diffuser 81 in sequence and then flows to the second gas tank 22. The other gas path passes through the second flow controller M2 and also passes through the second gas tank 22. The gas in the second gas tank 22 flows to the second diverter F2. The gas path is monitored by the second pressure gauge P2 for the air pressure of the second gas tank 22. The diverter F2 is further divided into two branch gas paths. The first branch gas path passes through the eighth flow controller M8, the second three-way valve W2, and the second gas path port 12 in sequence. The second three-way valve W2 can change the direction of the gas flow to the gas outlet Q4. The second branch gas path flows to the sixth one-way valve S6 and then flows to the gas outlet Q4.

[0069] 3) The third main gas path is used to output ethanol standard gas, including: a fifth gas valve V5 and a third flow divider F3 connected in sequence, the other end of the third flow divider F3 is divided into three branches, including a first branch, a second branch, and a third branch, the first branch and the second branch are used to prepare high-concentration ethanol gas, and the third branch is used to prepare low-concentration ethanol gas;

[0070] 3-1) The first branch flows to the third gas storage tank 23 through the fourth flow controller M4 and the ethanol diffuser 82 in sequence;

[0071] 3-2) The second branch flows to the third gas tank 23 through the fifth flow controller M5, and the gas in the third gas tank 23 flows to the fourth diverter F4 and is divided into three small branches. A third pressure gauge P3 is provided between the third gas tank 23 and the fourth diverter F4 to monitor the air pressure of the third gas tank 23; the first small branch flows to the fourth gas tank 24 through the tenth flow controller M10, and the second small branch passes through the ninth flow controller M9, the fifth three-way valve W5, the third three-way valve W3, and the gas path port 13 in sequence. The fifth three-way valve W5 can change the gas flow to the ethanol detector 9, and the third three-way valve W3 can change the gas flow to the gas outlet Q4. The third small branch flows to the seventh one-way valve S7 and then flows to the gas outlet Q4;

[0072] 3-3) The third branch flows to the fourth gas tank 24 through the sixth flow controller M6, and the gas in the fourth gas tank 24 flows to the fifth diverter F5. The fourth pressure gauge P4 is used to monitor the air pressure of the fourth gas tank 24. The other end of the fifth diverter F5 is divided into two small branches. One small branch passes through the seventh flow controller M7, the sixth three-way valve W6, the fourth three-way valve W4, and the fourth gas path port 14. The sixth three-way valve W6 can change the gas flow to the ethanol detector 9, and the fourth three-way valve W4 can change the gas flow to the gas outlet Q4. There is also a small branch that flows to the eighth one-way valve S8 and then flows to the gas outlet Q4; the other end of the ethanol detector 9 flows to the gas outlet Q4 after passing through the fifth one-way valve S5.

[0073] During the test, the gas path of the first gas path port 11 passes through the sensor sample A1 under test, then passes through the first one-way valve S1 and then flows to the gas outlet Q4; the gas path of the second gas path port 12 passes through the sensor sample A1 under test, then passes through the second one-way valve S2 and then flows to the gas outlet Q4; the gas path of the third gas path port 13 passes through the sensor sample A1 under test, then passes through the third one-way valve S3 and then flows to the gas outlet Q4; the gas path of the fourth gas path port 14 passes through the sensor sample A1 under test, then passes through the fourth one-way valve S4 and then flows to the gas outlet Q4.

[0074] The first to fifth gas valves V1 to V5 , the pressure regulating valve V7 , the first to sixth three-way valves W1 to W6 , and the first to fourth pressure gauges P1 to P4 are all electrically connected to the controller and the display panel 200 , and then operated through the display panel 200 .

[0075] The acetone diffuser 81 and the ethanol diffuser 82 are placed in the thermostat 8, and the thermostat 8 is also connected to the display panel 200, and the temperature is also controlled and adjusted through the display panel 200. The acetone diffuser 81 and the ethanol diffuser 82 are respectively placed in two temperature control systems of the thermostat 8, and the two temperature control systems are independent and can respectively monitor and control the temperature of the acetone diffuser 81 and the ethanol diffuser 82. Liquid can be added to the acetone diffuser 81 and the ethanol diffuser 82 through the liquid filling cover 400 above the equipment machine 100.

[0076] The first to fourth gas path ports 11 - 14 respectively output gases required for zero point test, interference gas test, upper limit test of measurement range, and standard measurement point test.

[0077] The following first explains the generation principle of the standard gas (test gas with a fixed concentration value) used for testing:

[0078] In the preparation stage, the liquid filling cap 400 is opened, and about two-thirds of the liquid is added to the acetone diffuser 81 and the ethanol diffuser 82 respectively, and the thermostat 8 is started to maintain the liquid diffuser at a specific temperature, so that the solvent in the liquid diffuser will evaporate through the diffusion tube at a certain rate.

[0079] By blowing a continuous and stable air carrier gas, the volatilized solvent in the diffusion tube is transported to the gas mixing tank. At the same time, another air is also transported to the same gas mixing tank as a dilution gas to obtain a standard gas of corresponding concentration. The diffusion tube in the diffuser theoretically obeys Fick's gas diffusion law, and its theoretical calculation formula is:

[0080]

[0081] Where r represents the diffusion rate, D represents the diffusion coefficient of the component gas, M represents the molar mass of the component gas, S represents the inner diameter cross-sectional area of ​​the diffusion tube, L represents the length of the diffusion tube, T represents the temperature of the diffusion tube, T0 represents the thermodynamic temperature value, R represents the gas constant, P represents the total pressure at the diffusion tube mouth, and p represents the partial pressure of the diffusion component.

[0082] For a specific liquid diffuser, the inner diameter cross-sectional area S and length L of the diffusion tube are preset and unchanged, so the diffusion rate r is only related to the molecular diffusion coefficient D, the component partial pressure p, and the total pressure P of the diffusion tube. At a constant temperature, the diffusion coefficient D and the component partial pressure p remain constant. When the dilution gas flows at a fixed flow rate through the flow controller, the total pressure P at the diffusion tube orifice also remains unchanged. Therefore, when the temperature is constant and the flow rate through the diffusion tube orifice is fixed, the diffusion rate is a fixed value.

[0083] Therefore, under known diffusion rate and fixed temperature, the theoretical calculation formula for the standard gas concentration after air passes through the diffusion tube is:

[0084]

[0085] Where C represents the standard gas concentration, r represents the diffusion rate, and Q represents the total flow rate of the carrier gas and the dilution gas.

[0086] To summarize, the synthetic air is divided into two paths, one for carrier gas and the other for dilution gas. Therefore, at a certain temperature, a fixed flow rate of carrier gas passes through a liquid diffuser to obtain a high-concentration standard gas, and then the dilution gas is used to obtain the required concentration of standard gas.

[0087] The process of compressed air 2 generating clean gas to the first gas storage tank 21: opening the first gas valve V1 and the air compressor 2. Ambient air enters through the air inlet Q1, passes through the purifier 1 and enters the air compressor 2. The air compressor 2 continuously generates air at a certain rate (for example, 2L / min to 5L / min). The generated air passes through the gas-liquid separator 3, where the water generated during the separation process will temporarily accumulate at the bottom of the gas-liquid separator 3. After the test is completed, it can be separated through the water stop valve 4 and discharged from the drain port Q2. The gas generated during the separation process enters the dryer 5 and then enters the first gas storage tank 21. At this time, the first pressure gauge P1 will display the gas pressure in the second gas storage tank 21. At the same time, the control module 6 monitors the first pressure gauge P1. When the pressure gauge P1 displays a certain pressure value (for example, it can be set to 0.6MPa), the control module 6 can control the air compressor 2 to stop working. When the pressure of the first pressure gauge P1 drops to a certain pressure stability value (for example, it can be set to 0.3MPa), the air compressor 2 restarts to generate air. Therefore, when the equipment is operating normally, the gas pressure in the gas storage tank 21 is maintained above the stable value. When the equipment stops running for a long time, the gas valve V2 can be opened to discharge the gas in the gas storage tank 21 from the exhaust port Q2.

[0088] When the gas in the first gas tank 21 reaches the specific pressure value initially set, the third gas valve V3, the fourth gas valve V4 and the fifth gas valve V5 can be opened by one button through the device display panel 200. After passing through the pressure stabilizing valve 7, the gas in the first gas tank 21 passes through the third gas valve V3, the fourth gas valve V4 and the fifth gas valve V5 at a stable flow rate and flows to the subsequent gas path. All flow controllers M1-M10 are opened by one button, and the output flow of all flow controllers M1-M10 has been preset. In this way, it can be ensured that the airflow of each gas path is basically the same through the gas path ports 11-14. The following examples are all described by taking 100mL / min as an example.

[0089] The process of the clean air of the zero point test being output from the first gas path port 11 is as follows:

[0090] The purified air passes through the third air valve V3, and by adjusting the first flow controller M1 (which can be set to 100 mL / min), the air flow will flow to the first three-way valve W1 at a fixed flow rate. In the test state, the first three-way valve W1 is set to point to the air path port 11 to output purified air to purge the sensor sample. In the non-test state, the first three-way valve W1 is set to point to the air outlet Q4 to ensure that the gas can be discharged smoothly.

[0091] Standard gas (test gas with fixed concentration value) generation process: When air passes through acetone diffuser 81 and ethanol diffuser 82, corresponding gas will be generated, such as Fig.13 As shown, taking the ethanol diffuser 82 as an example, the solvent 822 is added into the container 821 by opening the sealing cover 823, and then the sealing cover 823 is tightly sealed to ensure that the container 821 has good airtightness. The thermostat 8 is turned on through the display panel 200, for example, it can be set to 30°C to 40°C, so that the solvent in the container 821 will diffuse to the nozzle cavity 825 through the diffusion tube 824 at a certain diffusion rate. The diffusion tube 824 can be set to have an outer diameter of 5mm to 20mm and a length of 200mm to 300mm. At the beginning, the liquid adding top cover 400 of the device is opened, and corresponding operations can be performed to add corresponding solvents to the two diffusers.

[0092] The process of outputting acetone standard gas (interference gas) in air from the second gas path port 12 is as follows:

[0093] In the preparation stage, the purified air passes through the fourth air valve V4 and then the first splitter F1 and is divided into two air paths. One air path passes through the third flow controller M3 and the acetone diffusion tube 81 to obtain 10 mg / L to 50 mg / L of acetone in the air and enters the first gas storage tank 21. The clean air in the other air path also enters the second gas storage tank 22 from the second flow controller M2 to dilute the gas. For example, after dilution, about 0.5 mg / L of acetone gas in the air can be obtained.

[0094] The second pressure gauge P2 shows the pressure of the gas in the second gas tank 22. After running for a period of time, the display value of the second pressure gauge P2 should be stable and maintained at a certain level. If the pressure value drops abnormally, it may be due to insufficient gas supply or the air tightness of the gas circuit is not up to standard, which will affect the gas storage in the second gas tank 22 and further affect the gas flow of the subsequent gas circuit. After passing through the second diverter F2, the gas is divided into two branches. One branch of the gas circuit is adjusted by the eighth flow controller M8 (set to 100mL / min as in the previous text). At this time, the gas flow will flow to the second three-way valve W2 at a fixed flow rate. In the test state, the second three-way valve W2 is set to point to the second gas circuit port 12, so as to output the acetone standard gas in the air to purge the sensor sample. In the non-test state, the second three-way valve W2 is set to point to the gas outlet Q4 to ensure that the gas can be discharged smoothly. The other branch of the gas circuit flows the excess gas from the sixth one-way valve S6 to the gas outlet Q4.

[0095] The process of outputting the ethanol standard gas in high concentration air (measurement range upper limit test) from the third gas path port 13:

[0096] In the preparation stage, the purified air passes through the fifth air valve V5 and then the third flow divider F3 and is divided into three air paths. One air path passes through the fourth flow controller M4 and the ethanol diffusion tube 82, and 10mg / L to 50mg / L of ethanol in the air can be obtained to enter the gas storage tank 23. Another air path also enters the third gas storage tank 23 through the fifth flow controller M5 to dilute the gas. For example, about 2mg / L of ethanol gas in the air can be obtained after dilution. Another air path leads to the subsequent air path through the sixth flow controller M6. The third pressure gauge P3 shows the pressure of the gas in the third gas storage tank 23. After running for a period of time, the display value of the third pressure gauge P3 should be stable and maintained at a certain level. If the pressure value drops abnormally, it may be due to insufficient gas supply or the air tightness of the gas path is not up to standard, which will affect the gas storage in the third gas storage tank 23 and further affect the gas flow of the subsequent gas path.

[0097] At this time, the gas coming out of the third gas tank 23 passes through the fourth diverter F4 and then passes through three air paths. One air path is adjusted by the ninth flow controller M9 (set to 100mL / min as in the previous text). At this time, the air flow will flow to the fifth three-way valve W5 at a fixed flow rate. The other end of the fifth three-way valve W5 points to the ethanol detector 9. After passing through for a period of time, observe whether the ethanol concentration displayed by the ethanol detector 9 is a preset value, for example, the preset value is 2mg / L. If it is too low, the fourth flow controller M4 can be appropriately increased or the flow of the fifth flow controller M5 can be reduced, and vice versa. When the ethanol concentration displayed by the ethanol detector 9 is basically the preset value, the fifth three-way valve W5 is adjusted to point to the direction of the third three-way valve W3. Under the test state, the third three-way valve W3 is set to point to the third air path port 13, so that the ethanol standard gas in the high-concentration air is output to purge the sensor sample. Under the non-test state, the third three-way valve W3 is set to point to the gas outlet Q4 to ensure that the gas can be discharged smoothly. Another gas path leads to the subsequent gas path through the tenth flow controller M10, and another gas path flows the excess gas from the seventh one-way valve S7 to the gas outlet Q4.

[0098] The process of low concentration air ethanol standard gas (standard measurement point test) output from the fourth gas path port 14:

[0099] In the preparation stage, the low-concentration air ethanol standard gas can be obtained by adjusting the sixth flow controller M6 and the tenth flow controller M10 to dilute the high-concentration air ethanol gas in the previous step. For example, when the concentration of the 2mg / L air ethanol standard gas in the third gas storage tank 23 is to be reduced to 0.4mg / L, the flow ratio of the sixth flow controller M6 and the tenth flow controller M10 can be set to 4:1. In this way, the high-concentration air ethanol standard gas from the third gas storage tank 23 will enter the fourth gas storage tank 24 through the tenth flow controller M10, and the clean air will also enter the fourth gas storage tank 24 from the sixth flow controller M6 to dilute the gas. The fourth pressure gauge P4 shows the pressure of the gas in the fourth gas storage tank 24. After running for a period of time, the display value of the fourth pressure gauge P4 should be stable and maintained at a certain level. If the pressure value drops abnormally, it may be due to insufficient gas supply or the air tightness of the gas path is not up to standard, which will affect the gas storage in the fourth gas storage tank 24 and further affect the gas flow of the subsequent gas path. At this time, the gas coming out of the fourth gas tank 24 is divided into two gas paths through the fifth diverter F5. One gas path is adjusted by the seventh flow controller M7 (set to 100mL / min as in the previous text), and the air flow will flow to the sixth three-way valve W6 at a fixed flow rate at this time. The sixth three-way valve W6 points to the ethanol detector 9. After passing through for a period of time, the ethanol concentration displayed by the ethanol detector 9 is observed. If there is a large deviation, the flow of the sixth flow controller M6 or the tenth flow controller M10 can be appropriately adjusted. When the concentration of the ethanol detector 9 basically meets the requirements, the sixth three-way valve W6 is adjusted to point to the fourth three-way valve W4 direction. Under the test state, the fourth three-way valve W4 is set to point to the fourth gas path port 14, so that the ethanol standard gas in the low-concentration air is output to purge the sensor sample. Under the non-test state, the fourth three-way valve W4 is set to point to the gas outlet Q4 to ensure that the gas can be discharged smoothly.

[0100] Depending on the type of sensor, the flow controller can be adjusted to select the concentration of ethanol standard gas in the output air according to the test type. For example, the output of ethanol standard gas in the air for evidence-type alcohol sensors is 2 mg / L and 0.4 mg / L respectively, and the output of ethanol standard gas in the air for fast-screening alcohol sensors is 0.454 mg / L and 0.1 mg / L respectively.

[0101] Specific test operation process:

[0102] Before the test, the sensor samples A1 to be tested are placed in the sample plate A2 respectively. The structure of the sensor samples A1 to be tested matches the groove of the sample plate A2. The air inlet A11 and the air outlet A12 of each sensor sample A1 extend out of the sample plate A2. Taking the first air path port 11 as an example, the air port pipeline Q11 of the first air path port 11 of the test gas generating device F and the air path pipe D67 of the air path circuit connection device D can be connected thereto;

[0103] Place all sample devices A in a stacked form on the equipment platform 100 below the automatic clamping device B;

[0104] The conveyor belt C1 is driven and supported by the roller C2 to achieve rolling. The roller C2 is started intermittently. Each time the roller C2 is started, the sample plate A2 will move along the rolling of the conveyor belt C1. Its moving distance is the distance between the adjacent gas path ports 11 to 14. In this way, after the test of one gas path port is completed, the sensor sample A1 to be tested moves to the next gas path port for testing. This process is described as "transmission mode". In the "transmission mode", the three-way valve W1, three-way valve W2, three-way valve W3, and three-way valve W4 are automatically switched to the gas outlet Q4, so that the airflow of the equipment gas path is discharged from the gas outlet Q4.

[0105] When the sample device A moves from the conveyor belt C1 to a certain gas path port 11-14, the roller C2 will stop starting and the conveyor belt C1 will also stop rolling. At this time, the equipment tests the sensor sample A1 under test. This process is described as "test mode". At this time, the clamp B4 is located at the upper end of the stacking layer of the sample device A, the slide B3 moves in an offset manner, and the sliding block B32 connected to the clamp B4 moves downward. The clamp B4 moves downward relying on the sliding block B32. A proximity sensor (not shown) is provided at the lower end of the clamp B4, and clamps B5 are provided on both sides of the lower end. When the proximity sensor senses that the sample plate A2 is at a certain distance, the clamps B5 tighten and clamp the sample plate A2, and then the slide B3 starts to recover, and the clamp B4 also moves upward to its original position. The moving column B1 moves horizontally along the horizontal bar B2 to the upper end of the transmission belt C1 and stops. The clamp B4 moves downward relying on the slide B3. When the bottom of the sample plate A2 is placed on the conveyor belt C1, the clamp B5 is released, and then the clamp B4 moves upward to its original position as the slide B3 recovers, and the moving column B1 continues to move along the horizontal bar B2 and returns to the position above the sample stack. There is a gravity sensor at the bottom of the sample stack (not shown). When all the sample plates A2 of a certain stacking layer are tested, the moving column B1 moves to the top of another stacking layer, and then performs the clamping operation. Each stacking layer is placed in a fixed position. When there is no sample plate A2 at the sample stacking, the device will issue a warning to remind the user to replace the next batch of sample plates A2 to be tested. This solution takes three stacking layers as an example. In fact, multiple stacking layers can be designed according to needs.

[0106] Sample testing process: In the above-mentioned "test mode", the sample plate A2 stops at a specific position between the first gas path port 11 and the fourth gas path port 14 under the rolling of the conveyor belt C1. Taking the sample plate A2 placed in front of the first gas path port 11 as an example, when the air inlet ports A11 at both ends of the sensor sample A1 on the sample plate A2 are in the same straight line with the gas port pipeline Q11 of the first gas path port 11, the moving block D1 of the test mechanism will drop, and then the entire test plate D2 will also drop. The test plate has four sets of bracket groups, each of which has a node D4 in the middle, so that the test plate D2 can drop to the node D4 and stop dropping. Each set of bracket groups has two brackets D3 for fixing the sample plate A2. One bracket D3 matches the limiting groove A5 of the sample plate A2, and a circuit board D5 is provided on the other bracket D3, so that during the matching process, the circuit board D5 can be fully contacted and matched with the line groove A13 on the sensor sample A1, and the rear end of the circuit board D5 is connected to the ethanol electrochemical analysis device G, so that the ethanol electrochemical analysis device G and the sensor sample A1 to be tested can form an electrical circuit, and its alcohol concentration can pass through the ethanol electrochemical analysis device G, and its concentration value can be displayed on the display panel 200 of the device.

[0107] Taking the sample plate A2 moving to the first gas path port 11 as an example, the first gas path port 11 is equipped with gas port pipes Q11 of different inner diameters. The selected gas port pipe Q11 hose should match the outer diameter of the gas inlet port A11 of the sensor sample A1 to be tested. In the "test mode", the gas port pipe Q11 of the first gas path port 11 will be extended, and the gas inlet port A11 of the sensor sample can be covered by the gas port pipe Q11 of the gas path port 11. At the same time, there is a fixed block D61 under the test plate D2. The fixed block D61 is connected to the fixed cavity D62 due to the internal track, so the fixed block D61 can move vertically in the fixed cavity D62. There is a fixed column D63 in the fixed cavity D62, and a rolling slider D64 is provided on the upper end of the fixed column D63. The fixed cavity D62 also has a spring mechanism D65, which is connected to the telescopic rod D66, and the moving rod D66 is connected to the gas path pipe D67. In the "test mode", the fixed block D61 and the fixed cavity D62 descend due to the descent of the measuring plate D2. When the fixed cavity D62 contacts the sensor sample A1, it stops descending, so that the fixed block D61 continues to descend, so that the fixed block D61 is compressed into the fixed cavity D62. When the fixed block D61 and the fixed cavity D22 are compressed, the spring mechanism D65 is deformed and the telescopic rod D66 is moved into the fixed cavity D62. The other end of the telescopic rod D66 is an L-shaped air pipe D67. After the telescopic rod D66 moves into the fixed cavity D62, the air port of the air pipe D67 will cover the air outlet A12 of the sensor sample A1. Therefore, when the gas path ports A11 and A12 at both ends of the sensor sample can be covered by the first to fourth gas path ports 11-14, the device automatically switches the gas flow direction of the first three-way valve W1, the second three-way valve W2, the third three-way valve W3, and the fourth three-way valve W4 to point to the first to fourth gas path ports 11-14.

[0108] In the "test mode", when there is no sample plate A2 in front of the gas circuit where the first to fourth gas circuit ports 11-14 are located, this situation usually occurs at the beginning and end of the test sequence. Taking the first gas circuit port 11 as an example, when the sample plate A2 has completed the test in front of the gas circuit port 11 and the next sample plate has not yet been in place, the sample plate A2 will move to the front of the second gas circuit port 12. At this time, there is no sample plate A2 in front of the gas circuit pipe port Q11. According to the above operation, the gas port pipe Q11 will extend to its limit position. In order to avoid excessive gas discharge into the air, the equipment system will automatically switch the first three-way valve W1 to point to the gas outlet Q4. Similarly, in the "test mode", when there is no sample plate A2 in front of the first to fourth gas circuit ports 11-14, the corresponding first to fourth three-way valves W1-W4 will automatically switch to the gas outlet Q4 to avoid excessive output gas discharge into the air.

[0109] The airflow enters from one end of the first to fourth air path ports 11-14, flows through the sensor sample A1, and then from another air path pipe D67. The four groups of air path pipes D67 all flow to the first to fourth one-way valves S1-S4 and then are connected to the air outlet Q4. In this way, the air paths of the air path pipe D67 all flow to the air outlet Q4. The device can test four sensor samples at the same time. Each sensor sample A1 performs zero point test, interference gas test, upper limit test of measurement range, and standard measurement point test in turn. Each group can perform multiple repeatable measurements. If it can be set to 6 times, the average value of the 6 measurements can be obtained through the display panel 200. The above parameters are all set in the qualified range. If the average values ​​of the repeatable measurements are all within the qualified range, the sensor sample A1 is judged to be qualified. If one group of parameters is not within the qualified range, the sensor sample A1 is judged to be unqualified.

[0110] After the sensor sample A1 is measured six times repeatedly, the test block D2 rises vertically and returns to its original position. The gas flow direction of the first three-way valve W1, the second three-way valve W2, the third three-way valve W3, and the fourth three-way valve W4 is automatically switched to the gas outlet Q4. Take the gas path port 11 as an example. The gas path pipe Q11 of the gas path port 11 shrinks and returns to its original position, and is separated from the gas inlet port A11 of the sensor sample. At the same time, the moving block D2 also rises and returns to its original position, so that the fixed block D61 and the fixed block D62 are no longer compressed, and the spring mechanism D65 returns to its original state. At the same time, the telescopic rod D66 moves outward and returns to its original position, and is separated from the gas outlet port A12 of the sensor sample A1. End the "test mode" and restart the "transmission mode". The sample plate A2 moves forward with the rolling of the conveyor belt C1, and the new sample plate is also moved by the first clamp B4 and placed on the conveyor belt C1 for testing.

[0111] Separation process of qualified and unqualified samples: When a sample plate A2 passes through four groups of gas path ports (11-14) and completes four groups of tests, it moves along the conveyor belt C1 and passes through the second fixture E3. If the sensor sample A1 is judged to be qualified, the second fixture E3 will not act on it. If the sensor sample A1 is judged to be unqualified, when the corresponding sample plate A2 moves to the second fixture E3, the second gripper E5 of the second fixture E3 will clamp the sample plate A2 with the unqualified sensor sample, and at the same time, the second gripper E5 will move slightly upward on the second fixture E3 for a distance, and then the moving block E1 moves along the crossbar E2, and the second gripper E5 then drops to place the sample plate A2 with the unqualified sensor sample on the conveyor belt E4 at the other end, and then the moving block E1 returns to the initial position along the crossbar E2, so that the unqualified sensor sample can be separated. This process is also carried out in the "test mode".

[0112] The present invention performs electrochemical performance tests on batches of sensor samples in different ways, and can output ethanol standard gas of different concentrations for testing as needed, thereby improving work efficiency. At the same time, the raw material liquid replaces the standard gas during the testing process, which greatly reduces the use of the standard gas, saves gas source consumption, and improves economic efficiency. In addition, the ventilation time and flow rate during each test are guaranteed to remain consistent, making the test results more accurate. At the same time, automatic testing and automatic screening are performed throughout the process, which greatly saves labor costs.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic detection device for electrical signals of an alcohol sensor, characterized in that: include: Equipment machine, sample device, automatic clamping device, automatic conveying device, gas circuit connection device, test gas generation device, ethanol electrochemical analysis device, automatic screening device, display panel and controller; The automatic clamping device, the automatic conveying device, and the automatic screening device are sequentially arranged on the equipment platform; The gas circuit connection device is located beside the automatic conveying device; the number of the gas circuit connection devices is four, which are respectively connected to the test gas generating device and the ethanol electrochemical analysis device; The sample device is located below the automatic clamping device; The automatic gripping device, the automatic conveying device, the gas circuit connection device, the test gas generating device, the ethanol electrochemical analysis device, the automatic screening device and the display panel are respectively connected to the controller; The automatic clamping device clamps the sample device containing the sample to be tested and places it on the automatic conveying device. The gas circuit connection device and the ethanol electrochemical analysis device are both connected to the sample to be tested for testing; unqualified products in the tested sample that have been tested are screened out by the automatic screening device.

2. The automatic detection device for electrical signals of an alcohol sensor according to claim 1, characterized in that: The test gas generating device comprises: a purifier, an air compressor, a gas-liquid separator, a dryer, a control module, a first gas mixing tank, a second gas mixing tank, a third gas mixing tank, a fourth gas mixing tank, a first flow splitter, a second flow splitter, a third flow splitter, a fourth flow splitter, a fifth flow splitter, a thermostat, an acetone diffuser, an ethanol diffuser, an ethanol detector, a first gas path port, a second gas path port, a third gas path port, and a fourth gas path port; The purifier, the air compressor, the gas-liquid separator, and the first gas mixing tank are connected in sequence; the purifier is connected to the air inlet through the first gas valve, one end of the first gas mixing tank is connected to the exhaust port through the second gas valve, and the other end is divided into three main gas paths after passing through a pressure stabilizing valve, including: a first main gas path, a second main gas path, and a third main gas path; a first pressure gauge is provided between the first gas mixing tank and the second gas valve, and the air compressor is connected to the first pressure gauge through a control module; the gas-liquid separator is connected to the drain port through a water stop valve; The first main gas path is used to output clean air, and includes: a third gas valve, a first flow controller, a first three-way valve, and a first gas path port connected in sequence; the first three-way valve is provided between the first flow controller and the first gas path port, and the first three-way valve is connected to the gas outlet; The second main gas path is used to output the acetone standard gas, and includes: a fourth gas valve and a first flow divider connected in sequence, the other end of the first flow divider is divided into two branch gas paths, one gas path passes through a third flow controller and an acetone diffuser in sequence and flows to the second gas storage tank, and the other gas path passes through the second flow controller and flows to the second gas storage tank, the other end of the second gas storage tank is connected to the second flow divider, and a second pressure gauge is provided on the gas path passing through, which is used to monitor the gas pressure of the second gas storage tank, and the other end of the second flow divider is further divided into two branch gas paths, one branch gas path passes through an eighth flow controller, a second three-way valve, and a second gas path port in sequence, the second three-way valve changes the gas flow direction to the gas outlet, and the other branch gas path flows to the sixth one-way valve and then flows to the gas outlet; The third main gas path is used to output ethanol standard gas, including: a fifth gas valve and a third flow divider connected in sequence, the other end of the third flow divider is divided into three branches, including a first branch, a second branch, and a third branch, the first branch and the second branch are used to prepare high-concentration ethanol gas, and the third branch is used to prepare low-concentration ethanol gas; The first branch flows to the third gas storage tank through the fourth flow controller and the ethanol diffuser in sequence; The second branch flows to the third gas tank through the fifth flow controller, the gas in the third gas tank flows to the fourth flow divider and then is divided into three small branches, a third pressure gauge is provided between the third gas tank and the fourth flow divider to monitor the air pressure of the third gas tank, the first small branch flows to the fourth gas tank through the tenth flow controller, the second small branch passes through the ninth flow controller, the fifth three-way valve, the third three-way valve, and the third gas path port in sequence, the fifth three-way valve can change the gas flow direction to the ethanol detector, the third three-way valve can change the gas flow direction to the gas outlet, and the third small branch flows to the gas outlet after passing through the seventh one-way valve; The third branch flows to the fourth gas tank through the sixth flow controller, the gas in the fourth gas tank flows to the fifth diverter, a fourth pressure gauge is provided between the fourth gas tank and the fifth diverter to monitor the gas pressure of the fourth gas tank, the other end of the fifth diverter is further divided into two small branch gas paths, one small branch gas path passes through the seventh flow controller, the sixth three-way valve, the fourth three-way valve, and the fourth gas path port, the sixth three-way valve can change the gas flow direction to the ethanol detector, the fourth three-way valve can change the gas flow direction to the gas outlet, and another small branch gas path flows to the eighth one-way valve and then flows to the gas outlet; the other end of the ethanol detector flows to the gas outlet after passing through the fifth one-way valve; During the test, the gas path of the first gas path port passes through the sensor sample under test, passes through the first one-way valve, and then flows to the gas outlet; the gas path of the second gas path port passes through the sensor sample under test, passes through the second one-way valve, and then flows to the gas outlet; the gas path of the third gas path port passes through the sensor sample under test, passes through the third one-way valve, and then flows to the gas outlet; the gas path of the fourth gas path port passes through the sensor sample under test, passes through the fourth one-way valve, and then flows to the gas outlet; The first to fifth gas valves, the pressure-stabilizing valve, the first to sixth three-way valves, and the first to fourth pressure gauges are all electrically connected to the controller and the display panel; The acetone diffuser and the ethanol diffuser are respectively placed in two temperature control systems in a thermostat, and the thermostat is connected to the display panel; the two temperature control systems monitor and control the temperatures of the acetone diffuser and the ethanol diffuser respectively.

3. The automatic detection device for electrical signals of an alcohol sensor as claimed in claim 2, characterized in that: The number of the gas circuit connection devices is four; Each of the gas circuit connection devices comprises: a moving block, a test plate, two brackets, a fixed block, a fixed cavity, a fixed column, a rolling slider, a spring mechanism, a telescopic rod, and a gas circuit tube; a circuit board connected to the ethanol electrochemical analysis device is provided on the inner side of one of the brackets; The fixing column is arranged at the bottom of the fixing cavity, the rolling slider is arranged above the fixing column, the spring mechanism is arranged above the rolling slider, one end of the spring mechanism abuts against an inner side wall of the fixing cavity, and the other end is connected to one end of the telescopic rod passing through the other side wall of the fixing cavity, the other end of the telescopic rod is connected to the gas pipe, and the fixing block is arranged above the spring mechanism in the fixing cavity, and the fixing block is located below the test plate; The upper part of the bracket is connected to the test plate; the upper part of the test plate is connected to the moving block, and the moving block moves downward under the action of the controller, driving the test plate to press down the fixed block, and the spring mechanism is forced to pull the air pipe to translate through the telescopic rod, so that the port at the L-shaped lower end of the air pipe is connected to the sample device.

4. The automatic detection device for electrical signals of an alcohol sensor as claimed in claim 1, characterized in that: The sample device comprises: a sensor sample to be tested and a sample plate; the sensor sample to be tested is embedded in the sample plate, one end of the sensor sample to be tested has an air inlet opening, the other end has an air outlet opening, the side has a line groove, and both sides of the sample plate have limit grooves.

5. The automatic detection device for electrical signals of an alcohol sensor as claimed in claim 1, characterized in that: The automatic clamping device includes: a moving column, a horizontal bar, a slide and a first clamp, the moving column is mounted on the horizontal bar, the slide includes: a fixed track and a sliding block, the fixed track is fixedly connected to the moving column, the sliding block is fixedly connected to the first clamp, the bottom of the first clamp has a first clamp for clamping the sample device, and the track direction of the fixed track is perpendicular to the direction of the horizontal bar.

6. The automatic detection device for electrical signals of an alcohol sensor as claimed in claim 1, characterized in that: The automatic conveying device comprises: a conveyor belt and a roller, wherein the roller is arranged below the conveyor belt and is used to drive the conveyor belt to operate.

7. The automatic detection device for electrical signals of an alcohol sensor as claimed in claim 1, characterized in that: The automatic screening device includes: a movable slider, a cross bar, a second clamp, and a conveyor belt. The movable slider is movably mounted on the cross bar. The movable slider and the second clamp are fixedly connected. A second clamp is provided below the second clamp for clamping unqualified products onto the conveyor belt.

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