A pull-out combustible gas detector calibration device and calibration method thereof

Abstract

The present invention relates to a pull-out combustible gas detector calibration device and a calibration method thereof, comprising a calibration box, a first gas analyzer, a second gas analyzer, a gas sample injector and a test box. The device is cleverly designed. By designing the material tray for placing the product to be tested into a drawer-type structure, it is convenient to quickly switch between multiple drawer-type material trays, the outlet flow volume is small, and costs are saved. When in use, the product to be tested is placed in a new drawer-type material tray in advance, and another drawer-type material tray installed in the calibration box is quickly pulled out, and the new drawer-type material tray is quickly pushed into the calibration box to realize the storage and retrieval of the product to be tested, which can save production time. By arranging a first air vent for the gas path of the combustible gas and a blocking component for opening or cutting off the gas path of the combustible gas on the partition, the circulation of the combustible gas between each chamber can be effectively controlled, a part of the combustible gas can be locked, and the product to be tested can be quickly switched conveniently, which saves calibration time and reduces testing hours.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and more particularly to a pull-out combustible gas detector calibration device and a calibration method thereof. Background Art

[0002] After assembly, any sensor must undergo comprehensive and rigorous performance verification according to design specifications. For example, after a period of use or after repair, key technical indicators must be calibrated to ensure that the sensor's performance meets requirements. Sensor calibration is the process of calibrating the sensor using a high-precision standard instrument to establish the corresponding relationship between the sensor's output and input, and also to determine the error relationship under different operating conditions.

[0003] With the continuous improvement of people's living standards and the increasing emphasis on environmental protection, the detection of various toxic and harmful gases, the monitoring of air pollution and industrial waste gas, and the testing of food and living environment quality have all placed higher demands on gas sensors. Therefore, in order to ensure the accuracy of the sensor and the integrity of the system, ventilation calibration is required during the production process of gas sensors.

[0004] The common calibration box used to calibrate the sensors to be tested has its top cover completely opened when placing or removing products. This can easily cause all the combustible gases in the calibration box to leak out, resulting in high production costs. Furthermore, the common calibration box cannot simultaneously calibrate multiple products to be tested with different gas detection concentrations, resulting in low work efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a pull-out combustible gas detector calibration device and a calibration method thereof in view of the above-mentioned defects of the prior art.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a pull-out combustible gas detector calibration device and a calibration method thereof, wherein, the calibration box comprises a calibration box with a hollow cavity, wherein a plurality of partitions are arranged in the calibration box to divide the hollow cavity into a first chamber, a second chamber, a third chamber, a fourth chamber and a fifth chamber in sequence; the gas concentration of the combustible gas in the first chamber, the second chamber, the third chamber, the fourth chamber and the fifth chamber decreases in sequence; the partition is provided with a first vent hole for the gas flow of the combustible gas, and a first vent hole for opening or cutting off the flow of the combustible gas. a blocking component for the gas path; the calibration box is provided with a plurality of feed ports respectively communicating with the second chamber and the fourth chamber; a drawer-type material tray is slidably provided on the feed port; at least one product to be tested can be placed in the drawer-type material tray; the calibration device also includes a first gas analyzer for detecting the concentration of combustible gas in the second chamber, a second gas analyzer for detecting the concentration of combustible gas in the fourth chamber, a gas sampler for filling the first chamber with combustible gas of a standard concentration, and a test box for calibrating the products to be tested in the second chamber and the fourth chamber;

[0007] The pull-out combustible gas detector calibration device and calibration method described in the present invention are as follows: wherein the blocking assembly includes two Z-axis slide rails respectively arranged on the left and right sides of the first air vent, an air baffle tightly fitted with the partition, and a driving mechanism for driving the air baffle to move up and down along the two Z-axis slide rails; a second air vent is provided on the air baffle; when the blocking assembly cuts off the flow path of the combustible gas, the second air vent is misaligned with the first air vent and is not connected; when the blocking assembly opens the flow path of the combustible gas, the second air vent is connected with the first air vent to form an air path for the combustible gas to pass through;

[0008] The calibration device and calibration method of the pull-out combustible gas detector of the present invention are as follows: wherein, fans for blowing the combustible gas in the upper chamber to the lower chamber are sequentially provided on the plurality of partitions;

[0009] The calibration device and calibration method of the pull-out combustible gas detector of the present invention are as follows: the surfaces of the partitions on both sides of the second chamber are respectively provided with a first slide assembly for the drawer-type material tray to slide; the surfaces of the partitions on both sides of the fourth chamber are respectively provided with a second slide assembly for the drawer-type material tray to slide;

[0010] The pull-out combustible gas detector calibration device and calibration method of the present invention are as follows: the insertion end of the drawer-type material tray is provided with a plurality of contact springs; the back of the calibration box is further provided with two probe wiring boards corresponding to the second chamber and the fourth chamber respectively; the probe wiring boards are connected to the test box via wires; the two probe wiring boards are each provided with a plurality of elastic probe heads that penetrate into the calibration box; when the drawer-type material tray is assembled in the calibration box, the contact springs abut against the elastic probe heads;

[0011] The pull-out combustible gas detector calibration device and calibration method of the present invention, wherein the front ends of the two elastic probe heads are connected to one of the contact springs, and the rear ends of the two elastic probe heads are connected to one of the wiring terminals of the test box;

[0012] The calibration device and calibration method of the pull-out combustible gas detector of the present invention are as follows: wherein the calibration box is further provided with an air inlet communicating with the first chamber, an air outlet communicating with the fifth chamber, and a valve for controlling the opening or closing of the air outlet; the air inlet, the plurality of fans, and the air outlet are all located on the same horizontal line;

[0013] The calibration device and calibration method of the pull-out combustible gas detector of the present invention, wherein the drawer door of the drawer-type material tray is further fixed with a sealing ring that fits tightly with the material inlet;

[0014] The present invention further discloses a calibration method for a pull-out combustible gas detector calibration device, wherein the calibration method uses the pull-out combustible gas detector calibration device described above for calibration; the calibration method is characterized in that the calibration method comprises the following steps:

[0015] S10: Preheat the first gas analyzer, the second gas analyzer and the gas sample injector for at least 4 hours;

[0016] S20: Pushing a plurality of drawer-type trays containing predicted products into the second chamber and the fourth chamber of the calibration box to form a sealed space in the calibration box; zeroing and calibrating the first gas analyzer;

[0017] S30: The first chamber is connected to the second chamber, and the gas sample injector injects a standard concentration of combustible gas into the first chamber. Simultaneously, the fan in the first chamber is turned on to pump the gas in the first chamber into the second chamber, and the gases in the first and second chambers are mixed to reach a calibrated gas concentration. When the first gas analyzer detects that the combustible gas concentration in the second chamber reaches a preset first calibration value, the gas sample injector stops injecting combustible gas. There is still a chip inside the product to be tested, and the test box writes the combustible gas concentration value onto the chip of the product to be tested in the second chamber to complete the calibration.

[0018] After calibration of the product to be tested in the second chamber is completed, the blocking component between the second chamber and the third chamber is driven to open the flow path of the combustible gas, and the blocking component between the third chamber and the fourth chamber is driven to open the flow path of the combustible gas, so that the second chamber, the third chamber, and the fourth chamber are interconnected, and fans on both sides of the third chamber are driven to allow the combustible gas in the second chamber to flow into the third chamber and the fourth chamber; when the second gas analyzer detects that the concentration of the combustible gas in the fourth chamber reaches a preset second calibration value, the second chamber is closed; and the test chamber writes the combustible gas concentration value onto the chip of the product to be tested in the fourth chamber to complete the calibration;

[0019] After the calibration of the product to be tested in the fourth chamber is completed, the drawer-type material trays in the second chamber and the fourth chamber are pulled out from the calibration box, and two new drawer-type material trays containing the product to be tested are pushed into the calibration box; the gas sample injector re-injects new gas into the second chamber to reach the calibrated concentration of the second chamber; and the above steps are repeated;

[0020] S40: When the calibration of the product to be tested is completed, the gas sample injector is closed, the gas outlet is opened, all the fans are turned on, and the combustible gas flow paths of all chambers are opened, so that the combustible gas in the calibration box is discharged from the gas outlet;

[0021] In the calibration method of the present invention, the gas concentration of the combustible gas in the second chamber is 50% LEL; and the gas concentration of the combustible gas in the fourth chamber is 25% LEL.

[0022] The beneficial effects of the present invention are as follows: the pull-out type combustible gas detector calibration device and the calibration method thereof are cleverly designed, the hollow chamber in the calibration box is divided into multiple chambers by multiple partitions, the gas concentrations of the combustible gas in the first chamber, the second chamber, the third chamber, the fourth chamber and the fifth chamber are successively reduced, and the second chamber and the fourth chamber are both calibration chambers for calibrating the product to be tested, which is convenient for the test box to calibrate multiple products to be tested with different gas detection concentrations at the same time, and the work efficiency is high; and by designing the material tray for placing the product to be tested into a drawer-type structure, it is convenient to quickly switch between multiple drawer-type material trays, the outlet flow is small, and there is no need to open the entire calibration chamber. The upper cover of the calibration box is fixed, thereby reducing the loss of combustible gas and saving costs; when in use, the product to be tested is placed in a new drawer-type material tray in advance, and another drawer-type material tray installed in the calibration box is quickly pulled out, and the new drawer-type material tray is quickly pushed into the calibration box to realize the storage and retrieval of the product to be tested; it can save production time; by arranging a first air vent for the flow of combustible gas and a blocking component for opening or cutting off the flow of combustible gas on the partition, the flow of combustible gas between each chamber can be effectively controlled, a part of the combustible gas can be locked, and the product to be tested can be quickly and conveniently switched, which saves calibration time and reduces testing hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts.

[0024] Figure 1 This is a front view of a pull-out combustible gas detector calibration device according to a preferred embodiment of the present invention;

[0025] Figure 2 yes Figure 1 AA cross-section in;

[0026] Figure 3 This is a top view of a pull-out combustible gas detector calibration device according to a preferred embodiment of the present invention;

[0027] Figure 4 yes Figure 3 BB cross-section diagram in;

[0028] Figure 5 This is a schematic diagram of the structure of a pull-out combustible gas detector calibration device according to a preferred embodiment of the present invention. Figure 1 ;

[0029] Figure 6 This is a partial structural diagram of a pull-out combustible gas detector calibration device according to a preferred embodiment of the present invention. Figure 2 ;

[0030] Figure 7 Schematic diagram of the contact between the drawer-type material tray and the probe terminal board in a preferred embodiment of the present invention;

[0031] Figure 8 The present invention is another preferred embodiment of a flow chart of a calibration method for a pull-out combustible gas detector calibration device. DETAILED DESCRIPTION

[0032] The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of the present invention are used to distinguish between different items, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0033] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] "Multiple" refers to two or more. "And / or" describes the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0035] Moreover, the terms "up, down, front, back, left, right, upper end, lower end, longitudinal" and the like that indicate directions are all based on the posture and position of the components or devices described in this solution during normal use.

[0036] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the following will be a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work shall fall within the scope of protection of the present invention.

[0037] Example 1:

[0038] A preferred embodiment of the present invention is a pull-out combustible gas detector calibration device and a calibration method thereof, such as Figure 1-7 As shown, the calibration box 100 includes a hollow cavity, wherein a plurality of partitions 106 are provided in the calibration box 100 to divide the hollow cavity into a first chamber 101, a second chamber 102, a third chamber 103, a fourth chamber 104 and a fifth chamber 105 in sequence; the gas concentration of the combustible gas in the first chamber 101, the second chamber 102, the third chamber 103, the fourth chamber 104 and the fifth chamber 105 decreases in sequence; the partition 106 is provided with a first vent hole 107 for the gas flow of the combustible gas, and a blocking component for opening or cutting off the gas flow of the combustible gas; the calibration box 100 is provided with a plurality of partitions 106 that are respectively connected to the second chamber 102 and the fourth chamber 104. A through-feed port 108; a drawer-type material tray 109 is slidably provided on the feed port 108; at least one product to be tested 10 can be placed in the drawer-type material tray 109; the product to be tested can be a detector or sensor for detecting combustible gas, or other existing products that need to be calibrated; the calibration device also includes a first gas analyzer 200 for detecting the concentration of combustible gas in the second chamber 102, a second gas analyzer 300 for detecting the concentration of combustible gas in the fourth chamber 104, a gas sampler 400 for filling the first chamber 101 with combustible gas of a standard concentration, and a test box 500 for calibrating the products to be tested 10 in the second chamber 102 and the fourth chamber 104.

[0039] It is worth mentioning that probe connection holes are provided in the second chamber and the fourth chamber (not shown in the figure), and the probes of the first gas analyzer and the second gas analyzer respectively detect the concentration of combustible gas in the second chamber and the fourth chamber through the probe connection holes, and the detection is accurate; the gas inlet end of the gas sampler can be connected to the gas cylinder 600 containing combustible gas through the gas pipe, and the gas outlet end is connected to the first chamber through the gas pipe; it is worth mentioning that the gas sampler controls whether the combustible gas in the gas cylinder flows into the first chamber; the first gas analyzer, the second gas analyzer, the gas sampler and the test box are all existing technologies and will not be repeated here.

[0040] The pull-out combustible gas detector calibration device and its calibration method are cleverly designed. The hollow chamber in the calibration box is divided into multiple chambers by multiple partitions. The gas concentrations of the combustible gas in the first chamber, the second chamber, the third chamber, the fourth chamber and the fifth chamber decrease in sequence. The second chamber and the fourth chamber are both calibration chambers for calibrating the product to be tested, which facilitates the test box to calibrate multiple products to be tested with different gas detection concentrations at the same time, and has high work efficiency. In addition, by designing the material tray for placing the product to be tested into a drawer-type structure, it is convenient to quickly switch between multiple drawer-type material trays, the outlet flow is small, and there is no need to open the upper cover of the entire calibration box. , thereby reducing the loss of combustible gas and saving costs; when in use, the product to be tested is placed in a new drawer-type material tray in advance, and another drawer-type material tray installed in the calibration box is quickly pulled out, and the new drawer-type material tray is quickly pushed into the calibration box to realize the storage and retrieval of the product to be tested; it can save production time; by arranging a first air vent for the flow of combustible gas on the partition and a blocking component for opening or cutting off the flow of combustible gas, the flow of combustible gas between each chamber can be effectively controlled, a part of the combustible gas is locked, and the product to be tested can be quickly and conveniently switched, saving calibration time and reducing testing hours.

[0041] Specifically, the gas concentration of the combustible gas in the second chamber 102 is 50% LEL; and the gas concentration of the combustible gas in the fourth chamber 104 is 25% LEL.

[0042] It is worth noting that the first gas analyzer and the second gas analyzer are both equipped with sampling pumps to measure the gas concentration of the combustible gas in the second chamber and the fourth chamber inside the box in real time through their air inlet and outlet. The first gas analyzer and the second gas analyzer both have the advantages of high measurement accuracy, good repeatability, rapid response, high reliability, little interference from other components, long life, and constant internal temperature.

[0043] The combustible gas can be flammable gas such as natural gas, liquefied gas, coal gas, etc.

[0044] The blocking assembly includes two Z-axis slide rails 110 respectively arranged on the left and right sides of the first air vent 107, an air baffle 111 tightly fitted with the partition 106, and a driving mechanism 112 that drives the air baffle 111 to move up and down along the two Z-axis slide rails 110; the driving mechanism 112 is a driving cylinder in the prior art and is not described here; a second air vent 113 is provided on the air baffle 111; when the blocking assembly cuts off the flow path of the combustible gas, the second air vent 113 is offset from the first air vent 107 and is not connected; when the blocking assembly opens the flow path of the combustible gas, the second air vent 113 is connected to the first air vent 107 to form an air path for the combustible gas to pass through.

[0045] Specifically, the outer surface of the calibration box 100 is further provided with a solenoid valve 114 for controlling multiple driving cylinders 112. The solenoid valve 114 can control any driving cylinder 112 to drive the air baffle 111 to open or cut off the flow path of the combustible gas according to actual conditions;

[0046] The back of the test box 500 is also provided with a plurality of solenoid valve connection terminals (not shown in the figure); the plurality of solenoid valve connection terminals (not shown in the figure) are electrically connected to the solenoid valve 114 via power lines, thereby controlling whether any driving cylinder 112 on the solenoid valve 114 is opened or closed;

[0047] Specifically, the calibration box 100 is further provided with an air inlet 115 communicating with the first chamber 101, an air outlet 116 communicating with the fifth chamber 105, and a valve 117 for controlling the opening or closing of the air outlet 116; the air inlet 115, multiple fans and the air outlet 116 are all located on the same horizontal line; this facilitates the discharge of all combustible gas in the hollow cavity in the calibration box; the calibration box is also provided with an air inlet hole (not shown) communicating with the fourth cavity, which can replenish a small amount of air into the fourth cavity, so that the combustible gas concentration in the fourth cavity quickly reaches a preset value; it is worth noting that the apertures of the air inlet 115 and the air inlet hole are 0.5 mm-15 mm, which reduces the gas loss in the calibration box;

[0048] Specifically, fans 118 are sequentially provided on multiple partitions 106 to blow the combustible gas in the upper chamber to the next chamber; before calibrating the product to be tested in the second chamber, the flow path of the combustible gas in the first chamber 101 and the second chamber 102 is opened, and then the fans on the partitions are turned on to allow the combustible gas in the first chamber to flow into the second chamber through the flow path, so that the combustible gas in the first chamber and the second chamber are mixed, thereby achieving the purpose of gas calibration concentration.

[0049] After calibrating the product to be tested in the second chamber, close the first chamber, connect the combustible gas paths between the second chamber, the third chamber, and the third chamber, and introduce the combustible gas in the second chamber into the third chamber and the fourth chamber through the fan 118 on the partitions on both sides of the third chamber, so that the combustible gas concentration in the fourth chamber reaches a predetermined value. When the calibration box finishes calibration, open the air outlet 116, all blocking components and all fans 118, so that the air outlet, the first chamber, the second chamber, the third chamber, the fourth chamber and the fifth chamber are connected, which is convenient for discharging the combustible gas in the calibration box and has high exhaust efficiency.

[0050] The back of the test box 500 is also provided with multiple fan terminals (not shown in the figure); the multiple fan terminals (not shown in the figure) are electrically connected to the multiple fans through power lines, thereby controlling the opening or closing of the multiple fans respectively, which is convenient for operation.

[0051] Specifically, the opposite side surfaces of the partitions 106 on both sides of the second chamber 102 are correspondingly provided with a first slide assembly 120 for the drawer-type material tray 109 to slide; the opposite side surfaces of the partitions 106 on both sides of the fourth chamber 104 are correspondingly provided with a second slide assembly 121 for the drawer-type material tray 109 to slide.

[0052] Preferably, the first slide assembly and the second slide assembly each include two Y-axis limit bars arranged vertically; a Y-axis slide for the drawer-type material tray to slide parallel to each other is provided between the two Y-axis limit bars, and the two sides of the drawer-type material tray are inserted parallel to each other into the two Y-axis slides, which is not only convenient for assembly, but also convenient for pulling and withdrawing the drawer-type material tray on the calibration box, and simple to operate; it is worth noting that the first slide assembly and the second slide assembly can also be other structures in the prior art for the drawer-type material tray to slide, such as directly providing a slide for the drawer-type material tray to slide on the partition, etc., all of the above belong to the protection scope of the present invention.

[0053] Specifically, if Figure 7 As shown, a first circuit board 1091 is provided on the drawer-type material tray 109; the conductive terminals of one or more products to be tested 10 are electrically connected to the first circuit board 1091; the insertion end of the drawer-type material tray is also provided with a plurality of contact springs 1092 electrically connected to the first circuit board 1091; the back of the calibration box 100 is also provided with two probe terminal boards 122 corresponding to the second chamber 102 and the fourth chamber 104 respectively; the probe terminal boards 122 are connected to the test box 500 through wires; the two probe terminal boards 122 are provided with a plurality of probe terminals that penetrate the calibration box 100 and connect to the contact springs 1092. The elastic probe head 1221 of the test chamber is retractable. When the drawer-type material tray 109 is assembled in the calibration box 100, the contact spring 1092 abuts against the elastic probe head 1221. In order to ensure that the elastic probe head contacts the contact spring and the test chamber more reliably and stably, the front ends of the two elastic probe heads 1221 are connected to a contact spring 1092, and the rear ends of the two elastic probe heads 1221 are connected to a terminal of the test chamber. A chip (not shown) is also provided inside the product to be tested 10, and the combustible gas concentration value is written on the chip by the test chamber to achieve the purpose of calibration.

[0054] Specifically, the interior of the test box 500 is also provided with a second circuit board (not shown in the figure) and a calibration terminal (not shown in the figure) electrically connected to the second circuit board (not shown in the figure); the calibration terminal (not shown in the figure) is connected to the two probe terminal boards 122 on the calibration box 100 through wires; it is worth noting that the circuit and test logic of the test box are existing technologies and do not need to be reflected in this patent, and will not be described here.

[0055] Specifically, a gas source triplet 700 is further provided on the outer surface of the calibration box 100; the gas source triplet is an existing technology, through which the inflow and outflow of combustible gas in the calibration box can be controlled, and it can also be connected to an external gas source to facilitate the adjustment of the concentration of combustible gas in each chamber in the calibration box.

[0056] The drawer door of the drawer-type material tray 109 is also fixed with a sealing ring 119 that fits tightly with the material inlet 108; this makes the box body more sealed during product calibration and can effectively slow down the leakage of combustible gas.

[0057] When in use, the first chamber and the second chamber are connected through the first through hole and the second through hole, and the other chambers are not connected. The gas sample injector controls the gas cylinder to inject combustible gas into the first chamber. At the same time, the combustible gas in the first chamber flows into the second chamber through the fan until the concentration of the combustible gas in the first chamber reaches a balance with the concentration of the combustible gas in the second chamber. When the first gas analyzer detects that the concentration of the combustible gas in the second chamber reaches a preset first calibration value, the gas sample injector stops injecting combustible gas, and the test box calibrates the product to be tested in the second chamber; at this time, the first chamber and the second chamber are not connected, and the first gas analyzer stops injecting combustible gas. The second chamber, the third chamber and the fourth chamber are connected, so that the combustible gas in the second chamber flows into the fourth chamber, and the combustible gas tested in the second chamber continues to test the product to be tested in the fourth chamber, so that the combustible gas is reused and the waste of combustible gas is reduced; when the second gas analyzer detects that the concentration of the combustible gas in the fourth chamber reaches the preset second calibration value, the test box calibrates the product to be tested in the fourth chamber; after the calibration is completed, the blocking components on all the partitions open the flow path of the combustible gas, and open the valve to discharge the combustible gas in the calibration box from the outlet.

[0058] Example 2:

[0059] The present invention also discloses a calibration method for a pull-out combustible gas detector calibration device, wherein the calibration method uses the pull-out combustible gas detector calibration device of the first embodiment for calibration; wherein, Figure 8 As shown, the calibration method includes the following steps:

[0060] S10: Preheating the first gas analyzer 200, the second gas analyzer 300 and the gas sample injector 400 for at least 4 hours;

[0061] S20: Pushing multiple drawer-type trays 109 containing predicted products into the second chamber 102 and the fourth chamber 104 of the calibration box 100 to form a sealed space in the calibration box 100; zeroing and calibrating the first gas analyzer 200;

[0062] S30: The first chamber 101 is connected to the second chamber 102, and the gas injector 400 injects a standard concentration of combustible gas into the first chamber 101. At the same time, the fan in the first chamber 101 is turned on to pump the gas in the first chamber 101 into the second chamber 102, so that the gases in the first chamber 101 and the second chamber 102 are mixed and reach the gas calibration concentration. When the first gas analyzer 200 detects that the combustible gas concentration in the second chamber 102 reaches a preset first calibration value, the gas injector 400 stops injecting the combustible gas. There is still a chip (not shown) inside the product 10 to be tested. The test box 500 writes the combustible gas concentration value onto the chip (not shown) of the product 10 to be tested in the second chamber 102 to complete the calibration.

[0063] After the calibration of the product under test 10 in the second chamber 102 is completed, the blocking assembly between the second chamber 102 and the third chamber 103 is driven to open the gas flow path for the combustible gas, and the blocking assembly between the third chamber 103 and the fourth chamber 104 is driven to open the gas flow path for the combustible gas, so that the second chamber 102, the third chamber 103, and the fourth chamber 104 are interconnected. The fans 118 on both sides of the third chamber 103 are driven to allow the combustible gas in the second chamber 102 to flow into the third chamber 103 and the fourth chamber 104. When the second gas analyzer 300 detects that the combustible gas concentration in the fourth chamber 104 reaches a preset second calibration value, the second chamber 102 is closed. The test chamber 500 writes the combustible gas concentration value onto the chip (not shown) of the product under test in the fourth chamber 104, thereby completing the calibration.

[0064] After the calibration of the product 10 to be tested in the fourth chamber 104 is completed, the drawer-type material trays 109 in the second chamber 102 and the fourth chamber 104 are pulled out of the calibration box 100, and two new drawer-type material trays 109 containing the product 10 to be tested are pushed into the calibration box 100; the gas sample injector 400 re-injects new gas into the second chamber 102 to reach the calibrated concentration of the second chamber 102; and the above steps are repeated;

[0065] S40: When the calibration of the product to be tested 10 is completed, the gas sample injector 400 is closed, the gas outlet 116 is opened, and all fans 118 and the combustible gas flow paths of all chambers are turned on, so that the combustible gas in the calibration box 100 is discharged from the gas outlet 116.

[0066] Specifically, the gas concentration of the combustible gas in the second chamber 102 is 50% LEL; and the gas concentration of the combustible gas in the fourth chamber 104 is 25% LEL.

[0067] The calibration method of the pull-out combustible gas detector calibration device is simple to operate. The gas concentrations of the combustible gas in the first chamber, the second chamber, the third chamber, the fourth chamber and the fifth chamber decrease in sequence, and the second chamber and the fourth chamber are both calibration chambers for calibrating the product to be tested, which facilitates the test box to calibrate a variety of products to be tested with different gas detection concentrations at the same time, and has high work efficiency. In addition, by designing the material tray for placing the product to be tested into a drawer-type structure, it is convenient to quickly switch between multiple drawer-type material trays, and the outlet flow is small, so there is no need to open the upper cover of the entire calibration box, thereby reducing the loss of combustible gas. , saving costs; when in use, the product to be tested is placed in a new drawer-type material tray in advance, and another drawer-type material tray installed in the calibration box is quickly pulled out, and the new drawer-type material tray is quickly pushed into the calibration box to realize the storage and retrieval of the product to be tested; it can save production time; by arranging a first air vent for the flow of combustible gas on the partition and a blocking component for opening or cutting off the flow of combustible gas, the flow of combustible gas between each chamber can be effectively controlled, a part of the combustible gas can be locked, and the product to be tested can be quickly and conveniently switched, which saves calibration time and reduces testing hours.

[0068] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A pull-out combustible gas detector calibration device, comprising a calibration box having a hollow cavity, characterized in that: The calibration box is provided with a plurality of partitions which divide the hollow cavity into a first chamber, a second chamber, a third chamber, a fourth chamber and a fifth chamber in sequence; the concentration of the combustible gas in the first chamber, the second chamber, the third chamber, the fourth chamber and the fifth chamber decreases in sequence; the partition is provided with a first vent for the flow of the combustible gas path, and a blocking component for opening or cutting off the flow of the combustible gas path; the calibration box is provided with a plurality of feed ports which are respectively connected to the second chamber and the fourth chamber; a drawer-type material tray is slidably provided on the feed port; at least one product to be tested can be placed in the drawer-type material tray; the calibration device also includes a first gas analyzer for detecting the concentration of the combustible gas in the second chamber, a second gas analyzer for detecting the concentration of the combustible gas in the fourth chamber, a gas sampler for filling the first chamber with combustible gas of a standard concentration, and a test box for calibrating the products to be tested in the second chamber and the fourth chamber; The blocking assembly includes two Z-axis slide rails respectively arranged on the left and right sides of the first air vent, an air baffle tightly fitted with the partition, and a driving mechanism for driving the air baffle to move up and down along the two Z-axis slide rails; a second air vent is provided on the air baffle; when the blocking assembly cuts off the flow path of the combustible gas, the second air vent is offset from the first air vent and is not connected; when the blocking assembly opens the flow path of the combustible gas, the second air vent is connected to the first air vent to form an air path for the combustible gas to pass through; The plurality of partitions are sequentially provided with fans for blowing the combustible gas in the upper chamber to the lower chamber.

2. The pull-out combustible gas detector calibration device according to claim 1, characterized in that: The opposite side surfaces of the partitions on both sides of the second chamber are correspondingly provided with a first slide assembly for the drawer-type material tray to slide; the opposite side surfaces of the partitions on both sides of the fourth chamber are correspondingly provided with a second slide assembly for the drawer-type material tray to slide.

3. The pull-out combustible gas detector calibration device according to claim 1, characterized in that: The insertion end of the drawer-type material tray is provided with a plurality of contact springs; the back of the calibration box is also provided with two probe terminal blocks corresponding to the second chamber and the fourth chamber respectively; the probe terminal blocks are connected to the test box through wires; both of the probe terminal blocks are provided with a plurality of elastic probe heads that penetrate into the calibration box; when the drawer-type material tray is assembled in the calibration box, the contact springs abut against the elastic probe heads.

4. The pull-out combustible gas detector calibration device according to claim 3, characterized in that: The front ends of the two elastic probe heads are connected to one of the contact springs, and the rear ends of the two elastic probe heads are connected to a wiring terminal of the test box.

5. The pull-out combustible gas detector calibration device according to claim 4, characterized in that: The calibration box is also provided with an air inlet communicating with the first chamber, an air outlet communicating with the fifth chamber, and a valve for controlling the opening or closing of the air outlet; the air inlet, the multiple fans and the air outlet are all located on the same horizontal line.

6. The pull-out combustible gas detector calibration device according to any one of claims 1 to 5, characterized in that: The drawer door of the drawer-type material tray is also fixed with a sealing ring that fits tightly with the material inlet.

7. A calibration method for a pull-out combustible gas detector calibration device, wherein the calibration method uses the pull-out combustible gas detector calibration device according to any one of claims 1 to 6 for calibration; characterized in that: The calibration method comprises the following steps: S10: Preheat the first gas analyzer, the second gas analyzer and the gas sample injector for at least 4 hours; S20: Pushing a plurality of drawer-type trays containing the products to be tested into the second chamber and the fourth chamber of the calibration box to form a sealed space in the calibration box; zeroing and calibrating the first gas analyzer; S30: The first chamber is connected to the second chamber, and the gas sample injector injects a standard concentration of combustible gas into the first chamber. Simultaneously, the fan in the first chamber is turned on to pump the gas in the first chamber into the second chamber, so that the gases in the first and second chambers are mixed and reach a gas calibration concentration. When the first gas analyzer detects that the combustible gas concentration in the second chamber reaches a preset first calibration value, the gas sample injector stops injecting combustible gas. There is still a chip inside the product to be tested, and the test box writes the combustible gas concentration value onto the chip of the product to be tested in the second chamber to complete the calibration. After calibration of the product to be tested in the second chamber is completed, the blocking component between the second chamber and the third chamber is driven to open the flow path of the combustible gas, and the blocking component between the third chamber and the fourth chamber is driven to open the flow path of the combustible gas, so that the second chamber, the third chamber, and the fourth chamber are interconnected, and fans on both sides of the third chamber are driven to allow the combustible gas in the second chamber to flow into the third chamber and the fourth chamber; when the second gas analyzer detects that the concentration of the combustible gas in the fourth chamber reaches a preset second calibration value, the second chamber is closed; and the test chamber writes the combustible gas concentration value onto the chip of the product to be tested in the fourth chamber to complete the calibration; After the calibration of the product to be tested in the fourth chamber is completed, the drawer-type material trays in the second chamber and the fourth chamber are pulled out from the calibration box, and two new drawer-type material trays containing the product to be tested are pushed into the calibration box; the gas sample injector re-injects new gas into the second chamber to reach the calibrated concentration of the second chamber; and the above steps are repeated; S40: When the calibration of the product to be tested is completed, the gas sampler is closed, the gas outlet is opened, all the fans are turned on, and the combustible gas flow paths of all chambers are opened, so that the combustible gas in the calibration box is discharged from the gas outlet.

8. The calibration method according to claim 7, characterized in that: The gas concentration of the combustible gas in the second chamber is 50% LEL; the gas concentration of the combustible gas in the fourth chamber is 25% LEL.

Images