Formaldehyde detection equipment for environment-friendly building material

Abstract

The invention relates to the technical field of formaldehyde detection, in particular to environment-friendly building material formaldehyde detection equipment. The unit operation device comprises a barrel, an operation cavity is formed in the barrel, an operation opening is formed in the front end of the barrel, the front end of the barrel seals the operation opening through a sealing door, a heater is arranged on the barrel, a formaldehyde detection sensor is fixedly installed in the operation cavity, and a distilled water supply pump, an air suction pump and a waste liquid recovery pump are connected to the barrel; the multifunctional frame comprises a main rotating shaft which is rotatably mounted on the barrel body, a center plate is mounted on the main rotating shaft, and the center plate is connected with a liquid pushing scraping plate. According to the invention, volatilization, detection, sample preparation and removal of formaldehyde, cleaning of the instrument and other work can be automatically completed in the closed cylinder, an operator does not need to transfer for multiple times, and meanwhile, the operator can be isolated from the formaldehyde to the greatest extent, so that the operation steps are simplified, and the health of the operator is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of formaldehyde detection, and specifically to a formaldehyde detection device for environmentally friendly building materials. Background Art

[0002] A large number of building boards are required during the building decoration process. During the production process of these building boards, a large amount of formaldehyde will be mixed in due to adhesives and other reasons. Therefore, using these boards for decoration will cause formaldehyde to gradually volatilize into the air, thus affecting the health of users.

[0003] In order to protect the health of users, it is necessary to detect the formaldehyde content of building materials put on the market. Among them, the dry method for measuring formaldehyde requires cutting the building materials into specified-sized shapes first and then placing them in a closed container. Then, distilled water is placed in the closed container, and the closed container is placed in an incubator to wait for the formaldehyde in the building materials to volatilize. The distilled water is used to absorb this formaldehyde. Subsequently, after mixing the corresponding detection reagents into the distilled water containing formaldehyde, precise measurements are carried out using equipment such as a spectrophotometer. In the existing operation process, it is necessary to transfer between multiple devices and instruments, and the operation is relatively cumbersome. At the same time, when the operator opens the closed container, the formaldehyde that is not absorbed by the distilled water in the closed container is easily inhaled by the operator, thus affecting the health of the operator. Moreover, due to the lack of reasonable formaldehyde removal measures, these formaldehydes are also easily dispersed into the workplace, affecting the environment.

[0004] Therefore, we need a formaldehyde detection device for environmentally friendly building materials to solve the problems of cumbersome operation steps and great health hazards during the existing dry method for detecting formaldehyde, and can effectively improve the safety and convenience of detection. Summary of the Invention

[0005] The purpose of the present invention is to provide a formaldehyde detection device for environmentally friendly building materials to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A formaldehyde detection device for environmentally friendly building materials, comprising: A main housing, on which a controller is fixedly installed; Unit operation device, the unit operation device includes a cylinder fixedly installed on the main housing, and an operation chamber is arranged inside the cylinder. An operation port is opened at the front end of the cylinder, and the operation port is closed by a closing door at the front end of the cylinder. A heater for heating the operation chamber is arranged on the cylinder, and a formaldehyde detection sensor for detecting the formaldehyde content in the gas located in the operation chamber is fixedly installed in the operation chamber. A distilled water supply pump for injecting distilled water into the operation chamber is connected to the cylinder. An air extraction pump for extracting the gas located in the operation chamber is connected to the cylinder, and a waste liquid recovery pump for extracting the liquid located in the operation chamber is connected to the cylinder. The heater, formaldehyde detection sensor, distilled water supply pump, air extraction pump and waste liquid recovery pump are all electrically connected to the controller; Multifunctional rack, the multifunctional rack includes a main rotating shaft rotatably installed on the cylinder, and a central plate for carrying building material samples is installed in the operation chamber on the main rotating shaft. A liquid pushing and scraping plate is connected to the central plate through a connecting ring, and the liquid pushing and scraping plate scrapes the inner wall of the operation chamber and pushes and mixes the liquid located at the bottom of the operation chamber under the rotation drive of the main rotating shaft.

[0007] Optionally, a driving device for driving the main rotating shaft to rotate is arranged on the cylinder. The driving device includes a driving motor fixedly installed on the cylinder, and the driving motor is electrically connected to the controller. A worm gear is coaxially installed on the main rotating shaft, and a worm meshingly connected to the worm gear is driven by the output end of the driving motor.

[0008] Optionally, the bottom of the closing door is hinged to the cylinder, and the top of the closing door is clamped and installed on the cylinder. A handle for conveniently opening the closing door is arranged on the closing door, and a transparent observation window for directly observing the inside of the operation chamber is arranged on the closing door.

[0009] Optionally, a porous mesh plate for facilitating the rapid passage of gas and liquid through the central plate is arranged on the central plate, and a drainage groove for facilitating the discharge of the liquid between the connecting ring and the inner wall of the operation chamber is arranged on the connecting ring.

[0010] Optionally, a partition rack is fixedly installed on the liquid pushing and scraping plate. The partition rack is used for separating building material samples and for stirring the liquid located in the operation chamber under the drive of the main rotating shaft.

[0011] Optionally, insertion slots are formed on both the left and right sides of the central plate, and a brushing device for scraping and cleaning the inner wall of the working chamber is arranged in the insertion slots. The brushing device includes a first connecting plate and a second connecting plate inserted and installed inside the insertion slots. A brush piece for scraping the inner wall of the working chamber is fixedly installed on the outer side of the second connecting plate. An inflatable chamber is formed between the first connecting plate and the second connecting plate by an airtight outer wrapping film. A ventilation port for inflating and deflating the inside of the inflatable chamber is arranged on the first connecting plate. A guiding tube is fixed on the first connecting plate, and a guiding rod is fixed on the second connecting plate and slidably inserted into the guiding tube to guide the moving direction of the second connecting plate.

[0012] Optionally, a bottom film is hermetically arranged at the bottom of the inflatable chamber, and a limiting insertion block is fixedly installed on the bottom film. A jack for inserting and limiting the limiting insertion block is formed in the insertion slot, and a reset elastic piece for resetting the position of the limiting insertion block is installed between the first connecting plate and the bottom film.

[0013] Optionally, a cleaning agent storage tank, a distilled water storage tank, a waste liquid collection tank and a gas collection tank are respectively fixedly installed in the main housing. The cleaning agent storage tank is communicated with the working chamber through a cleaning agent supply pump to supply the cleaning agent to the working chamber. The cleaning agent supply pump is electrically connected with the controller. The distilled water storage tank is communicated with the liquid inlet end of the distilled water supply pump. The waste liquid collection tank is communicated with the liquid discharge end of the waste liquid recovery pump. The gas collection tank is communicated with the exhaust end of the air extraction pump.

[0014] Optionally, at least two unit working devices are arranged on the main housing. Each working chamber is communicated with the liquid discharge end of the distilled water supply pump through an independent distilled water injection valve. Each working chamber is communicated with the air inlet end of the air extraction pump through an independent air valve. Each working chamber is communicated with the liquid discharge end of the cleaning agent supply pump through an independent cleaning agent injection valve. Each working chamber is communicated with the liquid inlet end of the waste liquid recovery pump through an independent drain valve.

[0015] Optionally, a sampling tube is inserted and installed at the bottom of the central plate, and a push rod is fixedly installed at the bottom of the central plate. An extrusion plate is driven by the output end of the push rod, and a sealing plug for closing the sampling tube is tightly clamped on the extrusion plate. The controller is electrically connected with the push rod through a slip ring coaxially installed with the main rotating shaft. An operation switch electrically connected with the controller and used for controlling the controller is fixedly installed at the front end of the cylinder body.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The present invention can automatically complete tasks such as the volatilization, detection, sample preparation, removal of formaldehyde, and the cleaning of the instrument itself inside a sealed cylinder. It does not require multiple transfers by the operator. At the same time, it can also maximize the isolation of the operator from formaldehyde, thus simplifying the operation steps and ensuring the health of the operator. It solves the problems of cumbersome operation steps and great health hazards in the existing formaldehyde detection by the drying method, and can effectively improve the safety and convenience of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a cross-sectional view of the structure of the present invention; Figure 3 is a schematic structural diagram of the unit operation device of the present invention; Figure 4 is a side view of the structure of the unit operation device of the present invention; Figure 5 is a cross-sectional view of the structure of the unit operation device of the present invention; Figure 6 is a schematic internal structure diagram of the unit operation device of the present invention; Figure 7 is a schematic structural diagram of the multi-functional rack of the present invention; Figure 8 is a schematic structural diagram of the scraping device of the present invention; Figure 9 is a cross-sectional view of the scraping device of the present invention.

[0018] In the figure: 1, main housing; 2, scraping device; 201, first connecting plate; 202, ventilation opening; 203, outer wrapping film; 204, inflation chamber; 205, brush piece; 206, bottom film; 207, second connecting plate; 208, guiding tube; 209, guiding rod; 210, limiting insertion block; 211, reset elastic piece; 3, driving device; 301, driving motor; 302, worm; 303, worm gear; 4, multi-functional rack; 401, liquid-pushing scraping plate; 402, main rotating shaft; 403, connecting ring; 404, central plate; 405, inserting slot; 406, porous mesh plate; 407, dividing rack; 408, drainage groove; 5, unit operation device; 501, cylinder body; 502, operation chamber; 503, operation opening; 504, operation switch; 505, closing door; 506, transparent observation window; 6, distilled water injection valve; 7, cleaner storage tank; 8, distilled water storage tank; 9, waste liquid collection tank; 10, push rod; 11, extrusion plate; 12, closing plug; 13, sampling tube; 14, cleaner injection valve; 15, heater; 16, air valve; 17, formaldehyde detection sensor; 18, drainage valve; 19, slip ring; 20, controller; 21, air extraction pump; 22, cleaner supply pump; 23, gas collection tank; 24, distilled water supply pump; 25, waste liquid recovery pump. Detailed implementation mode

[0019] In order to clearly and completely describe the purpose, technical solution of the present invention and make the advantages more clearly understood, the following further details the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all the embodiments, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0020] Embodiment 1: Please refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6, the present invention provides a formaldehyde detection device for environmentally friendly building materials, including a main housing 1, a unit operation device 5 and a multi-functional rack 4. A controller 20 is fixedly installed on the main housing 1. The unit operation device 5 includes a cylinder body 501 fixedly installed on the main housing 1, and an operation chamber 502 is arranged inside the cylinder body 501. An operation port 503 is opened at the front end of the cylinder body 501, and the operation port 503 is closed by a closing door 505 at the front end of the cylinder body 501. The bottom of the closing door 505 is hingedly installed with the cylinder body 501, and the top of the closing door 505 is clamped and installed with the cylinder body 501. A handle for conveniently opening the closing door 505 is arranged on the closing door 505, and a transparent observation window 506 for directly observing the inside of the operation chamber 502 is arranged on the closing door 505. The operator can directly observe the operation status inside the operation chamber 502 through the transparent observation window 506, or directly open the closing door 505, and then place or take out the building material sample into or from the operation chamber 502 through the operation port 503.

[0021] Please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6, a heater 15 for heating the working chamber 502 is provided on the cylinder body 501. A temperature detection sensor for detecting the internal temperature of the working chamber 502 is also provided in the working chamber 502, and the temperature detection sensor is electrically connected to the controller 20. Thus, the heating operation of the inside of the working chamber 502 can be realized by using the heater 15, and the controller 20 can also adjust the working state of the heater 15 in real time according to the temperature data detected by the temperature detection sensor, so as to ensure that the inside of the working chamber 502 can be in a preset constant temperature state. Moreover, the heater 15 can also be used for drying the working chamber 502, so as to evaporate the remaining moisture in the working chamber 502. And a formaldehyde detection sensor 17 for detecting the formaldehyde content in the gas in the working chamber 502 is fixedly installed in the working chamber 502. The controller 20 can detect the formaldehyde content in the gas in the working chamber 502 through the formaldehyde detection sensor 17. The formaldehyde detection sensor 17 can adopt commonly used formaldehyde sensors on the market, such as surface acoustic wave formaldehyde gas sensors, formaldehyde oxide gas sensors, etc. A distilled water supply pump 24 for injecting distilled water into the working chamber 502 is connected to the cylinder body 501. An air extraction pump 21 for extracting the gas in the working chamber 502 is connected to the cylinder body 501. And a waste liquid recovery pump 25 for extracting the liquid in the working chamber 502 is connected to the cylinder body 501. The heater 15, the formaldehyde detection sensor 17, the distilled water supply pump 24, the air extraction pump 21 and the waste liquid recovery pump 25 are all electrically connected to the controller 20. The distilled water can be sent into the working chamber 502 through the distilled water supply pump 24 to absorb the formaldehyde volatilized from the building material sample. Then, by sampling the distilled water absorbing formaldehyde, the formaldehyde content in the distilled water can be detected by using equipment such as a spectrophotometer, and further the formaldehyde content in the building material sample can be calculated. The waste liquid recovery pump 25 can directly recover the waste liquid in the working chamber 502, so that manual handling of the waste liquid is not required. During the process of treating the waste liquid, the distilled water supply pump 24 will continuously supply distilled water to wash the inner wall of the working chamber 502 until the inner wall of the working chamber 502 is washed clean. Subsequently, the heater 15 dries the inside of the working chamber 502, so that the remaining distilled water in the working chamber can volatilize into gas and be discharged by the air extraction pump 21. In this way, the cleanliness of the inside of the working chamber can be maintained, which facilitates the next detection.

[0022] Please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7, the multi-functional rack 4 includes a main rotating shaft 402 rotatably installed on the cylinder body 501, and a central plate 404 for carrying building material samples is installed in the working chamber 502 on the main rotating shaft 402. A liquid-pushing scraper 401 is connected to the central plate 404 through a connecting ring 403. The liquid-pushing scraper 401 scrapes the inner wall of the working chamber 502 under the rotation drive of the main rotating shaft 402 and pushes and mixes the liquid at the bottom of the working chamber 502. When conducting the detection work, the operator needs to first make the building material sample into a specified size, then place it on the central plate 404, and then start the detection program built in the controller 20. The controller 20 will automatically execute the steps required for detection until the preset opening time is reached. When the operator takes out the building material sample from the working chamber 502, close the closing door 505 again and issue a cleaning instruction. At this time, the main rotating shaft 402 can rotate under the drive of the driving device 3, so as to use the liquid-pushing scraper 401 to push distilled water to brush the inside of the working chamber 502, facilitating the rapid cleaning of the inner wall of the working chamber 502.

[0023] Please refer to Figure 5 and Figure 7 , a porous mesh plate 406 that facilitates the rapid passage of gas and liquid through the central plate 404 is provided on the central plate 404, and a drainage groove 408 that facilitates the discharge of the liquid between the connecting ring 403 and the inner wall of the working chamber 502 is provided on the connecting ring 403. A partition frame 407 is fixedly installed on the liquid-pushing scraper 401. The partition frame 407 is used to separate the building material samples, and the partition frame 407 is used to stir the liquid in the working chamber 502 driven by the main rotating shaft 402. The partition frame 407 can separate the building material samples from each other, so as to avoid the mutual influence of the formaldehyde volatilization effect between multiple building material samples due to adhesion, fitting, etc., thus maximizing the accuracy of the detection. Moreover, the partition frame 407 can also be used to stir the distilled water in the subsequent cleaning process, thereby improving the cleaning efficiency. The porous mesh plate 406 can not only be used to carry the building material samples, but also facilitate the flow of gas and liquid inside the working chamber 502. At the same time, when the main rotating shaft 402 rotates, the porous mesh plate 406 can also be used to drive the distilled water to scour along the inner wall of the working chamber 502, facilitating the cleaning operation.

[0024] Please refer to Figure 4 and Figure 7, a driving device 3 for driving the main rotating shaft 402 to rotate is arranged on the cylinder body 501. The driving device 3 includes a driving motor 301 fixedly installed on the cylinder body 501, and the driving motor 301 is electrically connected to the controller 20. A worm gear 303 is coaxially installed on the main rotating shaft 402, and a worm 302 meshed with the worm gear 303 is driven by the output end of the driving motor 301. The worm gear 303 and the worm 302 can form a worm gear and worm driving mechanism with a self-locking function, so that when the main rotating shaft 402 does not need to rotate, the building material sample can be stably supported by the center plate 404, and when the main rotating shaft 402 needs to rotate, the multifunctional frame 4 can be driven to rotate normally.

[0025] In this embodiment, when a tester needs to detect the formaldehyde content of a building material sample, the building material can be cut into a building material sample of a specified size according to the regulations of the relevant detection process. Subsequently, the center plate 404 is adjusted to a horizontal state, and the building material sample is placed above the center plate 404. Then, the closing door 505 is closed. At this time, two detection procedures can be performed according to the detection requirements. When only detecting according to the volatilization of the building material sample in the air, distilled water does not need to be injected into the working chamber 502. When it is necessary to absorb formaldehyde with distilled water and then use equipment such as a spectrophotometer for accurate detection, the distilled water supply pump 24 is used to inject distilled water into the working chamber 502. Subsequently, the heater 15 is used to maintain a specified constant temperature state in the working chamber 502 for a specified time. If distilled water is not placed in advance in the detection procedure, the controller 20 directly collects the data of formaldehyde volatilization through the formaldehyde detection sensor 17 at this time. Subsequently, the exhaust gas inside the working chamber 502 is extracted by the air extraction pump 21. Then, after the operator takes out the building material sample on the center plate 404, since the exhaust gas has been extracted before the operator opens the closing door 505, the formaldehyde emitted from the working chamber 502 during the short period of opening the door can be almost ignored, thus maximizing the isolation of formaldehyde. After closing the closing door 505 again, the self-cleaning procedure can be entered through the controller 20. If distilled water is placed in advance in the program setting, after the operator takes out the building material sample, it is also necessary to take a sample of the distilled water after absorbing formaldehyde, and then let the controller 20 normally execute the cleaning procedure. When the controller 20 executes the cleaning procedure, the controller 20 first supplies a specified amount of distilled water into the working chamber 502 through the distilled water supply pump 24, and then discharges all the waste liquid through the waste liquid recovery pump 25. After repeating the operation of injecting distilled water and discharging the waste liquid at least three times, the controller 20 enters the brushing link. The controller 20 makes the distilled water continuously injected into the working chamber 502 and makes the driving device 3 drive the main rotating shaft 402 to rotate. At this time, the main rotating shaft 402 will use the liquid pushing scraper 401, the center plate 404 and the porous mesh plate 406 to push or throw the distilled water in the working chamber 502 onto the inner wall of the working chamber 502, and use the liquid pushing scraper 401 and the connecting ring 403 to brush the inner wall of the working chamber 502, so as to achieve cleaning. After injecting a specified amount of distilled water and making the main rotating shaft 402 rotate for a specified time, the waste liquid will be discharged again through the waste liquid recovery pump 25. Subsequently, repeating the brushing link at least three times can ensure the completion of cleaning. Then, the heater 15 is used to evaporate the remaining moisture inside the working chamber 502, and the evaporated moisture is extracted by the air extraction pump 21 to complete the cleaning work. Subsequently, it is possible to wait to enter the next round of formaldehyde detection operation. It solves the problems of cumbersome operation steps and great harm to health in the existing dry method for detecting formaldehyde, and can effectively improve the safety and convenience of detection.

[0026] Example 2: Please refer to Figure 7 , Figure 8 and Figure 9, on the basis of the first embodiment, plug slots 405 are provided on both the left and right sides of the central plate 404, and a brushing device 2 for scraping and cleaning the inner wall of the working chamber 502 is provided in the plug slot 405. The brushing device 2 includes a first connecting plate 201 and a second connecting plate 207 that are plugged and installed inside the plug slot 405. A brush piece 205 for scraping the inner wall of the working chamber 502 is fixedly installed on the outer side of the second connecting plate 207. An inflatable cavity 204 is formed between the first connecting plate 201 and the second connecting plate 207 through an airtight outer wrapping film 203. A ventilation port 202 for inflating and deflating the inside of the inflatable cavity 204 is provided on the first connecting plate 201. A guiding tube 208 is fixed on the first connecting plate 201, and a guiding rod 209 that is slidably inserted into the guiding tube 208 and is used to guide the moving direction of the second connecting plate 207 is fixed on the second connecting plate 207. The bottom of the inflatable cavity 204 is hermetically provided with a bottom film 206, and a limiting plug 210 is fixedly installed on the bottom film 206. A jack for plugging and limiting the limiting plug 210 is provided in the plug slot 405, and a reset spring piece 211 for resetting the position of the limiting plug 210 is installed between the first connecting plate 201 and the bottom film 206.When installing the scraping device 2, first, all the gas inside the inflation chamber 204 is pumped out. Subsequently, the first connecting plate 201 and the second connecting plate 207 are correctly placed at the corresponding positions in the insertion slot 405. Then, inflation can be resumed into the inflation chamber 204 from the ventilation port 202. When the inflation chamber 204 is inflated, due to the sliding fit of the guide rod 209 and the guide tube 208, the movement direction of the second connecting plate 207 relative to the first connecting plate 201 is restricted. Therefore, the second connecting plate 207 will move towards the direction of pressing against the inner wall of the working chamber 502, so that the brush piece 205 can be attached to the working chamber 502. By controlling the inflation amount into the inflation chamber 204, the friction force between the brush piece 205 and the inner wall of the working chamber 502 can be adjusted. And during subsequent use, if the brush piece 205 wears and the friction force decreases, the inflation amount can be increased to re-adjust the friction force between the brush piece 205 and the inner wall of the working chamber 502, without having to replace the entire scraping device 2. Therefore, maintenance is facilitated. Moreover, during the inflation of the inflation chamber 204, the outer wrapping film 203 can be utilized to expand and fill the gap between the scraping device 2 and the insertion slot 405, thereby preventing the liquid in the working chamber 502 from penetrating between the scraping device 2 and the insertion slot 405 during the operation of the scraping device 2 to form stagnant liquid. At the same time, during the inflation of the inflation chamber 204, the bottom film 206 will also be squeezed by the gas, so that the bottom film 206 moves towards the bottom and presses against the limit insertion block 210, enabling the limit insertion block 210 to be inserted into the insertion hole in the insertion slot 405. In this way, even without additional fixation of the scraping device 2, it can be prevented from falling off the insertion slot 405. Therefore, installation is facilitated. And when it is necessary to disassemble the scraping device 2, only the gas inside the inflation chamber 204 needs to be released from the ventilation port 202. At this time, the limit insertion block 210 will retract into the first connecting plate 201 under the rebound of the bottom film 206 and the reset elastic piece 211, thus no longer restricting the movement of the first connecting plate 201. And the second connecting plate 207 will also be separated from the state of pressing against the inner wall of the working chamber 502, facilitating the operator to extract the scraping device 2 from the insertion slot 405 through the operation port 503. Therefore, disassembly is facilitated. This makes the equipment easier to maintain and use. It further solves the problems of cumbersome operation steps and great harm to health during the existing dry method for detecting formaldehyde, and can effectively improve the safety and convenience of detection.

[0027] Embodiment 3: Please refer to Figures 1 to 6, on the basis of Embodiment 2, a cleaning agent storage tank 7, a distilled water storage tank 8, a waste liquid collection tank 9, and a gas collection tank 23 are fixedly installed in the main housing 1. The cleaning agent storage tank 7 is communicated with the working chamber 502 through a cleaning agent supply pump 22 and supplies the cleaning agent into the working chamber 502. The cleaning agent supply pump 22 is electrically connected to the controller 20. The distilled water storage tank 8 is communicated with the liquid inlet end of a distilled water supply pump 24, the waste liquid collection tank 9 is communicated with the liquid discharge end of a waste liquid recovery pump 25, and the gas collection tank 23 is communicated with the exhaust end of an air extraction pump 21. At least two unit working devices 5 are provided on the main housing 1. Each working chamber 502 is communicated with the liquid discharge end of the distilled water supply pump 24 through an independent distilled water injection valve 6, each working chamber 502 is communicated with the air inlet end of the air extraction pump 21 through an independent air valve 16, each working chamber 502 is communicated with the liquid discharge end of the cleaning agent supply pump 22 through an independent cleaning agent injection valve 14, and each working chamber 502 is communicated with the liquid inlet end of the waste liquid recovery pump 25 through an independent liquid discharge valve 18. The cleaning agent is used in the cleaning process of the working chamber 502. When the distilled water waste liquid containing formaldehyde is discharged for the first time, immediately after that, a specified amount of the cleaning agent will be supplied by the cleaning agent supply pump 22 while injecting distilled water. And when distilled water is injected into the working chamber 502 for the last time in the cleaning program, there is no need to inject the cleaning agent anymore, so as to ensure that there are no impurity components in the working chamber 502. The cleaning agent used can be a cleaning solvent such as a formaldehyde scavenger, or it can be prepared by oneself according to the needs of use. Since each unit working device 5 can work independently in this embodiment, the operator can simultaneously detect multiple building material samples, avoiding ineffective waiting time, thereby saving the detection time. It further solves the problems of cumbersome operation steps and great harm to health in the existing formaldehyde detection by the drying method, and can effectively improve the safety and convenience of detection.

[0028] Embodiment 4: Please refer to Figure 5 and Figure 7, on the basis of Embodiment 3, a sampling tube 13 is inserted and installed at the bottom of the central plate 404, and a push rod 10 is fixedly installed at the bottom of the central plate 404. The output end of the push rod 10 drives an extrusion plate 11, and a sealing plug 12 for closing the sampling tube 13 is clamped and installed on the extrusion plate 11. The controller 20 is electrically connected to the push rod 10 through a slip ring 19 coaxially installed with the main rotating shaft 402, and an operation switch 504 electrically connected to the controller 20 and used to control the controller 20 is fixedly installed at the front end of the cylinder body 501. The operation switch 504 is used for the operator to quickly issue a control instruction to the controller 20.This embodiment provides a sampling method for a completely formaldehyde-isolated environment. Before the operator places the building material sample on the central plate 404, the operator first needs to rotate the central plate 404 by 180 degrees. Then, insert the sampling tube 13 into the corresponding position on the central plate 404, and then clamp the sealing plug 12 on the extrusion plate 11. Then, flip the central plate 404 again and place the building sample normally above the central plate 404. Then, close the sealing door 505 and set the sampling program to the program with the sampling tube 13. At this time, the controller 20 injects a specified amount of distilled water into the working chamber 502 so that the liquid level of the distilled water can submerge the sampling tube 13. Then, the temperature in the working chamber 502 is kept constant for the set time. Then, the controller 20 will enter the automatic sampling and self-cleaning program. In the automatic sampling program, the controller 20 will control the main rotating shaft 402 to swing left and right, so that the sampling tube 13 and the liquid-pushing scraper 401 immersed in the distilled water can stir the distilled water, so that formaldehyde is evenly distributed in the distilled water. Then, the sealing plug 12 is squeezed onto the sampling tube 13 by the push rod 10 to seal the sampling tube 13. The push rod 10 can be an electric push rod. Then, the controller 20 automatically enters the self-cleaning program. Before the self-cleaning program provided in this embodiment is executed, the operator does not need to first take out the sampling tube 13 and the building material sample. Instead, after the first discharge of the waste liquid, the main rotating shaft 402 directly drives the building material sample and the sampling tube 13 to rotate. Since the sampling tube 13 itself is already sealed, during the subsequent cleaning process, the sample inside the sampling tube 13 will not be affected, while the outer wall of the sampling tube 13 can be cleaned during the cleaning process. At the same time, the partition frame 407 can not only separate different building material samples, but also clamp the building material samples by pre-replacing different partition frames 407, so that the building material samples can stably rotate with the main rotating shaft 402, so that the surface of the building material samples can be cleaned together during the subsequent cleaning process. After the cleaning is completed, the operator can directly take out the cleaned building material samples and the sampling tube 13. During the whole sample preparation process, the operator does not need to contact formaldehyde, and formaldehyde will not directly leak into the air, so it is safer and more environmentally friendly. Then, the operator extracts the formaldehyde-containing water vapor in the sampling tube 13 through equipment such as a syringe and then performs subsequent detection using equipment such as a spectrophotometer. This further solves the problems of cumbersome operation steps and great harm to health in the existing dry method for detecting formaldehyde, and can effectively improve the safety and convenience of detection.

[0029] Embodiment 5: On the basis of Embodiment 4, the present invention also provides a usage method of an environmental protection building material formaldehyde detection device, including the following steps: Step 1: When testers need to detect the formaldehyde content of building material samples, they can form building material samples of specified sizes according to the regulations of relevant detection procedures. Subsequently, adjust the center plate 404 to a horizontal state, and place the building material sample above the center plate 404. If the sampling tube 13 needs to be used, the sampling tube 13 also needs to be installed on the center plate 404 in advance. Then close the closing door 505. At this time, two detection procedures can be carried out according to the detection needs. When only detecting according to the volatilization of the building material sample in the air, distilled water does not need to be injected into the working chamber 502. When it is necessary to absorb formaldehyde with distilled water and then use equipment such as a spectrophotometer for precise detection, distilled water needs to be injected into the working chamber 502 through the distilled water supply pump 24. Subsequently, maintain the specified constant temperature state in the working chamber 502 through the heater 15 until the specified time; Step 2: If distilled water is not placed in advance in the detection procedure, the controller 20 directly collects the data of formaldehyde volatilization through the formaldehyde detection sensor 17 at this time. Subsequently, the exhaust gas inside the working chamber 502 is pumped out through the air extraction pump 21. Then, after the operator takes out the building material sample on the center plate 404 and closes the closing door 505 again, the self-cleaning procedure can be entered through the controller 20. If distilled water is placed in advance in the program setting, after the operator takes out the building material sample, it is also necessary to take samples of the distilled water after absorbing formaldehyde. If the sampling tube 13 is used, the controller 20 will automatically use the sampling tube 13 for sampling in this step; Step 3: Subsequently, let the controller 20 execute the cleaning program normally. When the controller 20 executes the cleaning program, the controller 20 first supplies a specified amount of distilled water into the working chamber 502 through the distilled water supply pump 24, and then discharges all the waste liquid through the waste liquid recovery pump 25. After repeating the operation of injecting distilled water and then discharging the waste liquid at least three times, the controller 20 enters the brushing link. The controller 20 makes the distilled water continuously injected into the working chamber 502 and makes the driving device 3 drive the main rotating shaft 402 to rotate. At this time, the main rotating shaft 402 will use the liquid pushing scraper 401, the central plate 404 and the porous mesh plate 406 to push or throw the distilled water located in the working chamber 502 onto the inner wall of the working chamber 502, and use the liquid pushing scraper 401 and the connecting ring 403 to brush the inner wall of the working chamber 502, so as to achieve cleaning. After injecting the specified amount of distilled water and making the main rotating shaft 402 rotate for a specified time, the waste liquid will be discharged again through the waste liquid recovery pump 25. Subsequently, repeating the brushing link at least three times can ensure the completion of cleaning. Then, the remaining moisture in the working chamber 502 is evaporated by the heater 15, and the evaporated moisture is extracted by the air extraction pump 21 to complete the cleaning work. Subsequently, it can wait to enter the next round of formaldehyde detection operation. If the sampling tube 13 is used, after the self-cleaning is completed, the operator needs to take out the building material sample and the sampling tube 13 located in the working chamber 502.

[0030] Although the above describes the illustrative specific embodiments of the present application for the convenience of those skilled in the art to understand the present application, the present application is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, all the application creations using the concept of the present application are within the scope of protection.

Claims

1. A formaldehyde detection device for environmentally friendly building materials, characterized in that: include: A main housing (1), wherein a controller (20) is fixedly mounted on the main housing (1); The unit operation device (5) comprises a cylinder (501) fixedly mounted on a main housing (1), wherein an operation chamber (502) is arranged inside the cylinder (501), an operation port (503) is provided at the front end of the cylinder (501), and the operation port (503) is closed at the front end of the cylinder (501) by a closed door (505), a heater (15) for heating the operation chamber (502) is arranged on the cylinder (501), and a detector (15) for detecting the formaldehyde content in the gas in the operation chamber (502) is fixedly mounted in the operation chamber (502). A formaldehyde detection sensor (17), the barrel (501) is connected to a distilled water supply pump (24) for injecting distilled water into the working chamber (502), the barrel (501) is connected to an air pump (21) for extracting gas in the working chamber (502), and the barrel (501) is connected to a waste liquid recovery pump (25) for extracting liquid in the working chamber (502), the heater (15), the formaldehyde detection sensor (17), the distilled water supply pump (24), the air pump (21) and the waste liquid recovery pump (25) are all electrically connected to a controller (20); A multifunctional rack (4) comprises a main rotating shaft (402) rotatably mounted on a cylinder (501), and the main rotating shaft (402) is provided with a center plate (404) for carrying a building material sample in a working chamber (502), and the center plate (404) is connected to a liquid pushing scraper (401) via a connecting ring (403), and the liquid pushing scraper (401) scrapes the inner wall of the working chamber (502) and pushes and mixes the liquid at the bottom of the working chamber (502) under the rotation drive of the main rotating shaft (402).

2. The formaldehyde detection device for environmentally friendly building materials according to claim 1, characterized in that: The cylinder (501) is provided with a driving device (3) for driving the main rotating shaft (402) to rotate. The driving device (3) comprises a driving motor (301) fixedly mounted on the cylinder (501), and the driving motor (301) is electrically connected to the controller (20). A worm gear (303) is coaxially mounted on the main rotating shaft (402), and the output end of the driving motor (301) drives a worm (302) meshingly connected to the worm gear (303).

3. The formaldehyde detection device for environmentally friendly building materials according to claim 1, characterized in that: The bottom of the closed door (505) is hingedly mounted on the cylinder (501), and the top of the cylinder (501) is clamped and mounted on the cylinder (501). The closed door (505) is provided with a handle for conveniently opening the closed door (505), and the closed door (505) is provided with a transparent observation window (506) for conveniently directly observing the interior of the working chamber (502).

4. The formaldehyde detection device for environmentally friendly building materials according to claim 1, characterized in that: The center plate (404) is provided with a porous mesh plate (406) for facilitating the rapid passage of gas and liquid through the center plate (404), and the connecting ring (403) is provided with a drainage groove (408) for facilitating the discharge of liquid between the connecting ring (403) and the inner wall of the working chamber (502).

5. The formaldehyde detection device for environmentally friendly building materials according to claim 1, characterized in that: A partition frame (407) is fixedly mounted on the liquid pushing scraper (401), and the partition frame (407) is used to separate building material samples. The partition frame (407) is used to stir the liquid in the working chamber (502) under the drive of the main rotating shaft (402).

6. The formaldehyde detection device for environmentally friendly building materials according to claim 1, characterized in that: The central plate (404) is provided with a plug-in slot (405) on both the left and right sides, and a scraping brush device (2) for scraping and cleaning the inner wall of the working chamber (502) is arranged in the plug-in slot (405), and the scraping brush device (2) comprises a first connecting plate (201) and a second connecting plate (207) plugged and installed in the plug-in slot (405), and a brush sheet (205) for scraping and cleaning the inner wall of the working chamber (502) is fixedly installed on the outer side of the second connecting plate (207), and the first connecting plate An inflation cavity (204) is formed between the first connecting plate (201) and the second connecting plate (207) through a sealed outer membrane (203), and a ventilation port (202) is provided on the first connecting plate (201) for inflating and deflating the interior of the inflation cavity (204), a guide tube (208) is fixed on the first connecting plate (201), and a guide rod (209) is fixed on the second connecting plate (207) and is slidably inserted in the guide tube (208) and is used to guide the movement direction of the second connecting plate (207).

7. The formaldehyde detection device for environmentally friendly building materials according to claim 6, characterized in that: The bottom of the inflation cavity (204) is sealed with a bottom membrane (206), and a limit plug (210) is fixedly installed on the bottom membrane (206), a plug hole for plugging and limiting the limit plug (210) is provided in the plug-in slot (405), and a reset spring (211) for resetting the position of the limit plug (210) is installed between the first connecting plate (201) and the bottom membrane (206).

8. The formaldehyde detection device for environmentally friendly building materials according to claim 1, characterized in that: A detergent storage tank (7), a distilled water storage tank (8), a waste liquid collection tank (9) and a gas collection tank (23) are fixedly installed in the main shell (1), and the detergent storage tank (7) is connected to the working chamber (502) through a detergent supply pump (22) and supplies detergent to the working chamber (502). The detergent supply pump (22) is electrically connected to the controller (20), and the distilled water storage tank (8) is connected to the liquid inlet end of the distilled water supply pump (24), the waste liquid collection tank (9) is connected to the liquid discharge end of the waste liquid recovery pump (25), and the gas collection tank (23) is connected to the exhaust end of the vacuum pump (21).

9. The formaldehyde detection device for environmentally friendly building materials according to claim 8, characterized in that: At least two unit operating devices (5) are arranged on the main shell (1); each of the operating chambers (502) is connected to the discharge end of the distilled water supply pump (24) via an independent distilled water injection valve (6); each of the operating chambers (502) is connected to the air inlet end of the air extraction pump (21) via an independent air valve (16); each of the operating chambers (502) is connected to the discharge end of the detergent supply pump (22) via an independent detergent injection valve (14); and each of the operating chambers (502) is connected to the liquid inlet end of the waste liquid recovery pump (25) via an independent liquid discharge valve (18).

10. The formaldehyde detection device for environmentally friendly building materials according to claim 1, characterized in that: A sampling tube (13) is plugged into and installed at the bottom of the center plate (404), and a push rod (10) is fixedly installed at the bottom of the center plate (404); the output end of the push rod (10) drives an extrusion plate (11), and a sealing plug (12) for sealing the sampling tube (13) is clamped and installed on the extrusion plate (11); the controller (20) is electrically connected to the push rod (10) through a collector ring (19) coaxially installed with the main shaft (402), and an operating switch (504) electrically connected to the controller (20) and used to control the controller (20) is fixedly installed at the front end of the cylinder (501).

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