Highly sensitive gas sensor for detecting formaldehyde content in artificial plywood

Abstract

The present application relates to the technical field of artificial plywood detection, and discloses a device and method for detecting formaldehyde content of artificial plywood by using a high-sensitivity gas sensor, which comprises a detection box and further comprises a dehumidification mechanism arranged in the detection box, wherein the dehumidification mechanism comprises mounting plates one and two arranged in the detection box, and a special-shaped cylinder is arranged on the mounting plates one and two. The circular mounting rack drives the permeation membrane to rotate to generate centrifugal force, which can throw away the excess water on the permeation membrane in the special-shaped cylinder, so that the excess water cannot enter the high-sensitivity gas sensor to affect the detection effect, and the water on the permeation membrane cannot affect the gas flow rate. The thrown-away water flows into the water-absorbing sponge in the water storage tank through the water drainage groove and the water drainage pipe, and is absorbed by the water-absorbing sponge, so that the water is not exposed in the device to cause high humidity in the device, and the influence of humidity on the detection of the high-sensitivity gas sensor is further reduced.

Description

Technical Field

[0001] This invention relates to the field of testing equipment for engineered wood products, specifically to a device and method for detecting formaldehyde content in engineered wood products using a highly sensitive gas sensor. Background Technology

[0002] With the rapid development of modern building decoration and furniture manufacturing industries, engineered wood products (PVP) have become widely used due to their low cost, high strength, and ease of processing. However, urea-formaldehyde resin, which contains formaldehyde, is often used as an adhesive in the production of PVP, leading to the continuous release of formaldehyde gas during use. Formaldehyde is a harmful volatile organic compound (VOC) with a strong, pungent odor. Long-term exposure to low concentrations of formaldehyde can cause respiratory diseases, allergic reactions, and even increase the risk of cancer. Therefore, rapid, accurate, and on-site detection of formaldehyde release from engineered wood products has become a crucial step in ensuring indoor air quality and human health.

[0003] The gas released by plywood at room temperature usually contains high humidity. During detection, water vapor may not only affect the response sensitivity and stability of electrochemical sensors, but may also cause internal components of the sensor to become damp and corroded, thereby reducing detection accuracy and service life. Traditional equipment mostly uses static filtration or chemical desiccant dehumidification, but the dehumidification efficiency is limited and it is difficult to achieve dynamic and continuous moisture separation. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for detecting formaldehyde content in engineered wood products using a highly sensitive gas sensor, in order to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a device for detecting formaldehyde content in engineered wood products using a highly sensitive gas sensor, comprising a detection chamber and further including: A dehumidification mechanism is installed inside the testing chamber. The dehumidification mechanism includes a first mounting plate and a second mounting plate installed inside the testing chamber. An irregularly shaped cylinder is installed on the first mounting plate and the second mounting plate. A circular mounting frame is installed inside the irregularly shaped cylinder. A threaded rod is installed on the circular mounting frame. The dehumidification mechanism is used to remove excess moisture during the testing process. A drainage mechanism is provided inside the testing chamber. The drainage mechanism includes a drainage groove on a shaped cylinder, a drainage pipe on the shaped cylinder, and two water outlets on the drainage pipe. Two water storage tanks are provided inside the testing chamber, and the two ends of the drainage pipe extend into the two water storage tanks respectively. The drainage mechanism is used to drain the residual water inside the testing chamber out of the testing chamber. The cleaning mechanism is installed inside the testing box. The cleaning mechanism includes two hollow boxes installed inside the testing box. Each of the two hollow boxes is provided with a limit spring. A rectangular push plate is provided at one end of each of the two limit springs that are close to each other. The cleaning mechanism is used to blow air in reverse to clean dust.

[0006] Furthermore, the dehumidification mechanism includes a first mounting plate and a second mounting plate fixedly installed inside the testing box. A shaped cylinder is fixedly installed on the first mounting plate and the second mounting plate. A circular mounting frame is rotatably installed inside the shaped cylinder. A threaded rod is rotatably installed through the first mounting plate and the second mounting plate. The circular mounting frame is fixedly connected to the threaded rod.

[0007] Furthermore, a permeation membrane is fixedly installed on the circular mounting bracket, a drive motor is fixedly installed inside the detection box, the output end of the drive motor is fixedly connected to the threaded rod, several air vents are opened on the second mounting plate, a high-sensitivity gas sensor is fixedly installed inside the detection box, several exhaust vents are opened on the top and bottom of the detection box, and a handle is fixedly installed on the back of the detection box.

[0008] Furthermore, the drainage mechanism includes a drainage groove formed on the irregularly shaped cylinder, a drainage pipe fixedly installed on the irregularly shaped cylinder, two water storage tanks fixedly installed on the bottom inner wall of the detection box, two rectangular grooves formed on the bottom of the two water storage tanks respectively, and rectangular blocks fixedly installed on the back of the two water storage tanks respectively.

[0009] Furthermore, L-shaped sliding plates are slidably installed inside the two water storage tanks, with the front ends of the two L-shaped sliding plates extending outside the two water storage tanks respectively. Rubber plates are fixedly installed on the top of the two L-shaped sliding plates, and water-absorbing sponges are fixedly installed on the back of the two L-shaped sliding plates respectively. Connecting plates are fixedly installed on the front ends of the two L-shaped sliding plates, and the two connecting plates slide out of the two water storage tanks respectively. The ends of the two connecting plates slide through the second mounting plate respectively.

[0010] Furthermore, a threaded plate is threaded onto the threaded rod, a return spring is fixedly installed on the back of the second mounting plate, and a circular plate is fixedly installed at the end of the return spring. The circular plate is in contact with the threaded plate, and two horizontal plates are fixedly installed on the threaded plate. The two horizontal plates are respectively fixedly connected to two connecting plates.

[0011] Furthermore, the cleaning mechanism includes hollow boxes fixedly installed on the inner walls of the top and bottom of the detection box. Limiting springs are fixedly installed on the sides of the two hollow boxes that are far apart from each other. Rectangular push plates are fixedly installed on the sides of the two limiting springs that are close to each other. Trapezoidal blocks are fixedly installed on the sides of the two rectangular push plates that are close to each other. The sides of the two trapezoidal blocks that are close to each other slide and extend outside the two hollow boxes.

[0012] Furthermore, ventilation pipes are fixedly installed on the front of the two hollow boxes respectively. Both ventilation pipes pass through the second mounting plate and extend into the irregular cylinder. Air blowing grooves are opened on the front of the two ventilation pipes respectively. A filter plate is rotatably installed on the first mounting plate. The filter plate is fixedly connected to the threaded rod. An annular plate is fixedly installed on the detection box and the first mounting plate.

[0013] Furthermore, a cleaning plate is rotatably sleeved on the threaded rod, the top end of the cleaning plate is fixedly connected to the annular plate, a dust discharge groove is opened on the annular plate, the bottom end of the cleaning plate extends into the dust discharge groove, a number of air inlet grooves are opened on the front of the detection box, and strip grooves are opened on the top and bottom of the detection box respectively. A fan blade is fixedly sleeved on the threaded rod.

[0014] Furthermore, the method steps for using the high-sensitivity gas sensor to detect formaldehyde content in engineered wood products are as follows: S1: Dehumidification: Since the gas contains moisture, when the gas passes through the permeation membrane, the moisture in the gas will pass through in a quantitative manner, while the excess moisture will fall onto the permeation membrane. During the rotation of the threaded rod, the circular mounting bracket will rotate. The circular mounting bracket will drive the permeation membrane to rotate and generate centrifugal force. The centrifugal force will throw the excess moisture on the permeation membrane into the irregular cylinder, ensuring that no excess moisture enters the high-sensitivity gas sensor and affects the detection effect. S2: Water absorption: Under the limiting action of the return spring and the ring plate, the threaded plate is kept stationary. At this time, the threaded plate is in a semi-disengaged state. The corresponding threaded plate will drive the horizontal plate to move, the horizontal plate will drive the connecting plate to move synchronously, the connecting plate will drive the L-shaped sliding plate to move, and the L-shaped sliding plate will drive the water-absorbing sponge to be located below the drain pipe, which is convenient for collecting water droplets. S3: Drainage: The L-shaped slide plate and rectangular block will squeeze the water-absorbing sponge, squeezing out the water inside the sponge and draining it out of the device through the rectangular groove. This prevents water from remaining inside the sponge, which could cause it to mold and affect its use. When the L-shaped slide plate moves and squeezes the water-absorbing sponge, the rubber plate at the top of the L-shaped slide plate will block the drain outlet of the drain pipe, preventing external dust from entering the device and affecting the detection accuracy of the device. S4: Cleaning: After the threaded plate is reset, it leaves the trapezoidal block. At this time, the rectangular push plate will be reset under the elastic force of the limit spring and push out the gas in the hollow box. The gas in the hollow box is blown towards the filter plate through the vent pipe and the air blowing channel. Since the filter plate will rotate with the threaded rod, the gas blown out of the air blowing channel will be blown onto the filter plate and remove the dust particles stuck in the filter plate holes, thus improving the cleaning effect of the filter plate.

[0015] The present invention has the following beneficial effects: (1) The device for detecting formaldehyde content in artificial plywood using the high-sensitivity gas sensor of the present invention is carried by hand. When using it, the air inlet slot on the front of the detection box is aligned with the plywood for detection. The drive motor is started, and the drive motor drives the threaded rod to rotate. The threaded rod drives several fan blades to rotate. The fan blades generate suction force to draw the gas on the plywood through the air inlet slot, the annular plate and the filter plate. Then the gas passes through the permeation membrane and the air outlet and is input into the high-sensitivity gas sensor for detection. The detected gas is discharged from the exhaust port. Since the gas contains moisture, when the gas passes through the permeation membrane, the moisture in the gas will pass through quantitatively, while the excess moisture will be discharged. The water will fall onto the permeate membrane. As the threaded rod rotates, it will drive the circular mounting bracket to rotate. The circular mounting bracket drives the permeate membrane to rotate, generating centrifugal force. This centrifugal force will shake off excess water from the permeate membrane into the irregularly shaped cylinder, ensuring that no excess water enters the high-sensitivity gas sensor and affects the detection effect. At the same time, it will prevent excessive water on the permeate membrane from affecting the gas flow rate. The shaken-off water will flow from the drain trough and drain pipe into the water-absorbing sponge in the water storage tank, where it will be absorbed by the sponge. This will prevent water from being exposed inside the device and causing high humidity, further reducing the impact of humidity on the detection of the high-sensitivity gas sensor.

[0016] (2) The device for detecting formaldehyde content in artificial plywood by the high-sensitivity gas sensor of the present invention will drive the threaded plate to move synchronously when the threaded rod rotates. The threaded plate will move towards the mounting plate 2. Under the continuous movement of the threaded plate, it will leave the thread on the threaded rod. At this time, the threaded plate will contact the ring plate. The corresponding ring plate will drive the return spring to compress and deform. When the threaded plate leaves the thread on the threaded rod, the threaded plate will be kept stationary under the limiting action of the return spring and the ring plate. At this time, the threaded plate is in a semi-disengaged state. Before the corresponding threaded plate moves to a standstill, it will drive the horizontal plate to move synchronously. The horizontal plate will drive the connecting plate to move synchronously. The connecting plate will drive the L-shaped sliding plate to move. The L-shaped sliding plate will drive the water-absorbing sponge to be located below the drain pipe, which is convenient for collecting water droplets.

[0017] (3) The device for detecting formaldehyde content in artificial plywood using the high-sensitivity gas sensor of the present invention reverses the drive motor after detection. The drive motor drives the threaded rod to reverse, and under the elastic force of the reset spring, it pushes the threaded plate to reconnect with the threaded rod. The threaded rod drives the threaded plate to reset, and at the same time, the connecting plate drives the L-shaped slide plate and the absorbent sponge to move closer to the rectangular block. Under the action of the L-shaped slide plate and the rectangular block, the absorbent sponge is squeezed, and the water in the absorbent sponge is squeezed out and discharged from the rectangular groove outside the device, so as to avoid water remaining in the absorbent sponge and causing the absorbent sponge to become moldy and affect its use. When the L-shaped slide plate moves and squeezes the absorbent sponge, the rubber plate at the top of the L-shaped slide plate will block the drain outlet of the drain pipe to prevent external dust from entering the device and affecting the detection accuracy of the device. By keeping the absorbent sponge in a compressed state when the device stops running, the water removal effect is further improved.

[0018] (4) The high-sensitivity gas sensor of the present invention is used to detect formaldehyde content in artificial plywood. When air passes through the filter plate, the filter plate will filter out dust particles in the air. When the threaded rod rotates, it will drive the filter plate to rotate synchronously. The rotation of the filter plate will contact the cleaning plate. Under the scraping action of the cleaning plate, the dust will be discharged from the dust discharge groove outside the annular plate along the cleaning plate. When the threaded plate approaches the second mounting plate, it will contact the trapezoidal block. At the same time, the trapezoidal block will drive the rectangular push plate to move, causing the limit spring to compress and deform. After the threaded plate is reset, the threaded plate leaves the trapezoidal block. At this time, the rectangular push plate will be reset under the elastic force of the limit spring and push out the gas in the hollow box. The gas in the hollow box is blown towards the filter plate through the vent pipe and the blowing groove. Since the filter plate will rotate with the threaded rod, the gas blown out of the blowing groove will be blown onto the filter plate and remove the dust particles stuck in the filter plate holes, improving the cleaning effect of the filter plate. This allows air to enter smoothly when the device is in use, avoiding unstable gas flow and affecting the detection effect.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side cross-sectional view of the present invention; Figure 3This is a schematic cross-sectional view of the side surface of the present invention; Figure 4 For the present invention Figure 3 A magnified structural diagram of A in the middle; Figure 5 This is a schematic diagram of the internal structure of the present invention; Figure 6 For the present invention Figure 2 A magnified structural diagram of B in the diagram; Figure 7 For the present invention Figure 2 A magnified structural diagram of C; Figure 8 This is a schematic diagram of the method steps of the present invention.

[0022] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Detection box; 101. Mounting plate one; 102. Mounting plate two; 103. Irregularly shaped cylinder; 104. Circular mounting bracket; 105. Threaded rod; 106. Permeable membrane; 107. Drive motor; 108. Vent; 109. High-sensitivity gas sensor; 110. Exhaust vent; 111. Handle; 2. Drainage trough; 201. Drainage pipe; 202. Water storage tank; 203. Rectangular groove; 204. Rectangular block; 205. L-shaped sliding plate; 20 6. Rubber sheet; 207. Absorbent sponge; 208. Connecting plate; 209. Threaded plate; 210. Return spring; 211. Circular plate; 212. Horizontal plate; 3. Hollow box; 301. Limiting spring; 302. Rectangular push plate; 303. Trapezoidal block; 304. Vent pipe; 305. Air blowing groove; 306. Circular plate; 307. Filter plate; 308. Cleaning plate; 309. Dust discharge groove; 310. Air inlet groove; 311. Strip groove; 312. Fan blade. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1-8 As shown, this invention is a device for detecting formaldehyde content in engineered wood products using a highly sensitive gas sensor, comprising a detection chamber 1, and further comprising: A dehumidification mechanism is installed inside the testing chamber 1. The dehumidification mechanism includes a mounting plate 101 and a mounting plate 102, both installed within the testing chamber 1. A shaped cylinder 103 is mounted on the mounting plate 101 and the mounting plate 102. A circular mounting bracket 104 is installed inside the shaped cylinder 103, and a threaded rod 105 is mounted on the circular mounting bracket 104. The dehumidification mechanism is used to remove excess moisture during the testing process. The dehumidification mechanism also includes mounting plates 101 and 102 fixedly installed inside the testing chamber 1. A shaped cylinder 103 is fixedly mounted on the mounting plate 101 and the mounting plate 102, and a threaded rod 105 is rotatably mounted inside the shaped cylinder 103. A circular mounting bracket 104 has a threaded rod 105 rotatably mounted on mounting plate 101 and mounting plate 2 102. The circular mounting bracket 104 is fixedly connected to the threaded rod 105. A permeable membrane 106 is fixedly mounted on the circular mounting bracket 104. A drive motor 107 is fixedly mounted inside the detection box 1. The output end of the drive motor 107 is fixedly connected to the threaded rod 105. Several air vents 108 are opened on mounting plate 2 102. A high-sensitivity gas sensor 109 is fixedly mounted inside the detection box 1. Several exhaust holes 110 are opened on the top and bottom of the detection box 1. A handle 111 is fixedly mounted on the back of the detection box 1.

[0025] When in use, hold the handle 111 and position the air inlet 310 on the front of the detection box 1 towards the plywood for detection. Start the drive motor 107, which drives the threaded rod 105 to rotate. The threaded rod 105 drives several fan blades 312 to rotate, and the fan blades 312 generate suction force to draw the gas from the plywood through the air inlet 310, the annular plate 306, and the filter plate 307. The gas then passes through the permeation membrane 106 and the air outlet 108 and is input into the high-sensitivity gas sensor 109 for detection. The detected gas is discharged from the exhaust port 110. Because the gas contains... The gas contains moisture. When the gas passes through the permeation membrane 106, the moisture in the gas will pass through in a measured amount, while the excess moisture will fall onto the permeation membrane 106. During the rotation of the threaded rod 105, the circular mounting bracket 104 will rotate. The circular mounting bracket 104 drives the permeation membrane 106 to rotate, generating centrifugal force. The centrifugal force will throw the excess moisture on the permeation membrane 106 into the irregular cylinder 103, ensuring that no excess moisture enters the high-sensitivity gas sensor 109 and affects the detection effect. At the same time, it avoids the excessive moisture on the permeation membrane 106 from affecting the gas flow rate.

[0026] like Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, a drainage mechanism is installed inside the testing chamber 1. The drainage mechanism includes a drainage groove 2 on the shaped cylinder 103, a drainage pipe 201 with two outlets on the shaped cylinder 103, and two water storage tanks 202 inside the testing chamber 1. The two ends of the drainage pipe 201 extend into the two water storage tanks 202 respectively. The drainage mechanism is used to drain residual water from the testing chamber 1. The drainage mechanism includes a drainage groove 2 on the shaped cylinder 103, a drainage pipe 201 fixedly installed on the shaped cylinder 103, and two water storage tanks 202 fixedly installed on the bottom inner wall of the testing chamber 1. Two rectangular grooves 203 are respectively opened at the bottom of the two water storage tanks 202, and rectangular blocks 204 are fixedly installed on the back of each of the two water storage tanks 202. L-shaped sliding plates 205 are slidably installed inside each of the two water storage tanks 202. The front ends of the two L-shaped slide plates 205 extend to the outside of the two water storage tanks 202 respectively. Rubber plates 206 are fixedly installed on the top of the two L-shaped slide plates 205 respectively. Water-absorbing sponges 207 are fixedly installed on the back of the two L-shaped slide plates 205 respectively. Connecting plates 208 are fixedly installed on the front ends of the two L-shaped slide plates 205 respectively. The two connecting plates 208 slide to the outside of the two water storage tanks 202 respectively. The ends of the two connecting plates 208 slide through the mounting plate 2 102 respectively. A threaded plate 209 is threaded on the threaded rod 105. A return spring 210 is fixedly installed on the back of the mounting plate 2 102. A ring plate 211 is fixedly installed at the end of the return spring 210. The ring plate 211 is in contact with the threaded plate 209. Two horizontal plates 212 are fixedly installed on the threaded plate 209. The two horizontal plates 212 are fixedly connected to the two connecting plates 208 respectively.

[0027] When the threaded rod 105 rotates, it drives the threaded plate 209 to move synchronously. The threaded plate 209 moves towards the mounting plate 102. With continuous movement, the threaded plate 209 disengages from the thread on the threaded rod 105. At this time, the threaded plate 209 contacts the annular plate 211. Correspondingly, the annular plate 211 causes the return spring 210 to undergo compression deformation. After the threaded plate 209 disengages from the thread on the threaded rod 105, it remains stationary under the limiting action of the return spring 210 and the annular plate 211. At this time, the threaded plate 209 is in a semi-disengaged state. It should be noted that the thread on the threaded rod 105 is raised, while the corresponding thread groove on the threaded plate 209 is recessed.

[0028] When the threaded plate 209 moves before coming to a standstill, it drives the horizontal plate 212 to move synchronously. The horizontal plate 212 drives the connecting plate 208 to move synchronously. The connecting plate 208 drives the L-shaped sliding plate 205 to move. The L-shaped sliding plate 205 moves the water-absorbing sponge 207 to a position below the drain pipe 201 for easy collection of water droplets. The reverse drive motor 107 drives the threaded rod 105 to reverse. Under the elastic force of the return spring 210, the threaded plate 209 will reconnect with the threads on the threaded rod 105. The threaded rod 105 will drive the threaded plate 209 to return to its original position. At the same time, the connecting plate 208 will move the L-shaped sliding plate 205 and the water-absorbing sponge 207 closer to the rectangular block 2. As the L-shaped slide 205 and rectangular block 204 move closer to the water-absorbing sponge 207, the water inside the sponge 207 is squeezed out and discharged from the device through the rectangular groove 203. This prevents water from remaining inside the sponge 207 and causing it to mold, thus affecting its use. When the L-shaped slide 205 moves and squeezes the sponge 207, the rubber plate 206 on top of the L-shaped slide 205 blocks the drain outlet of the drain pipe 201, preventing external dust from entering the device and affecting its detection accuracy. By keeping the sponge 207 in a compressed state when the device is not running, the water removal effect is further improved.

[0029] like Figure 1 , Figure 6 and Figure 7As shown, a cleaning mechanism is installed inside the detection box 1. The cleaning mechanism includes two hollow boxes 3 installed inside the detection box 1. Limiting springs 301 are installed inside each of the two hollow boxes 3. Rectangular push plates 302 are installed at the ends of the two limiting springs 301 that are close to each other. The cleaning mechanism is used for reverse air blowing to clean dust. The cleaning mechanism also includes hollow boxes 3 fixedly installed on the top and bottom inner walls of the detection box 1. Limiting springs 301 are fixedly installed on the sides of the two hollow boxes 3 that are far apart from each other. Rectangular push plates 302 are fixedly installed at the ends of the two limiting springs 301 that are close to each other. Trapezoidal blocks 303 are fixedly installed on the sides of the two rectangular push plates 302 that are close to each other. The ends of the two trapezoidal blocks 303 that are close to each other slide out of the two hollow boxes 3. Further, the front sides of the two hollow boxes 3 are respectively fixed... Two vent pipes 304 are fixedly installed, both of which pass through the mounting plate 102 and extend into the irregular cylinder 103. Air blowing grooves 305 are respectively opened on the front of the two vent pipes 304. A filter plate 307 is rotatably installed on the mounting plate 101, and the filter plate 307 is fixedly connected to the threaded rod 105. An annular plate 306 is fixedly installed on the detection box 1 and the mounting plate 101. Further, a cleaning plate 308 is rotatably sleeved on the threaded rod 105. The top end of the cleaning plate 308 is fixedly connected to the annular plate 306. A dust discharge groove 309 is opened on the annular plate 306, and the bottom end of the cleaning plate 308 extends into the dust discharge groove 309. Several air inlet grooves 310 are opened on the front of the detection box 1. Strip grooves 311 are opened on the top and bottom of the detection box 1. A fan blade 312 is fixedly sleeved on the threaded rod 105.

[0030] When air passes through the filter plate 307, the filter plate 307 filters out dust particles in the air. When the threaded rod 105 rotates, it drives the filter plate 307 to rotate synchronously. The rotation of the filter plate 307 will contact the cleaning plate 308. Under the scraping action of the cleaning plate 308, the dust will be discharged from the dust discharge groove 309 and the annular plate 306 along the cleaning plate 308. When the threaded plate 209 approaches the mounting plate 102, it will contact the trapezoidal block 303. At the same time, the trapezoidal block 303 will drive the rectangular push plate 302 to move, causing the limit spring 301 to undergo compression deformation. After the threaded plate 209 returns to its original position, the threaded rod 307 will return to its original position. When plate 209 leaves trapezoidal block 303, rectangular push plate 302 will reset under the elastic force of limit spring 301 and push out the gas in hollow box 3. The gas in hollow box 3 is blown towards filter plate 307 through vent pipe 304 and air blowing groove 305. Since filter plate 307 will rotate with threaded rod 105, the gas blown out of air blowing groove 305 will be blown onto filter plate 307, removing dust particles stuck in the holes of filter plate 307, improving the cleaning effect of filter plate 307, and allowing air to enter smoothly during use of the device, avoiding unstable gas flow and affecting the detection effect.

[0031] like Figures 1-8As shown, the equipment for detecting formaldehyde content in engineered wood products using a high-sensitivity gas sensor is described below, and the method steps are as follows: S1: Dehumidification: Since the gas contains moisture, when the gas passes through the permeation membrane 106, the moisture in the gas will pass through quantitatively, while the excess moisture will fall onto the permeation membrane 106. During the rotation of the threaded rod 105, it will drive the circular mounting bracket 104 to rotate. The circular mounting bracket 104 drives the permeation membrane 106 to rotate, generating centrifugal force. The centrifugal force will throw the excess moisture on the permeation membrane 106 into the irregular cylinder 103, ensuring that no excess moisture enters the high-sensitivity gas sensor 109 and affects the detection effect. S2: Water absorption: Under the limiting action of the return spring 210 and the annular plate 211, the threaded plate 209 is kept stationary. At this time, the threaded plate 209 is in a semi-disengaged state. When the threaded plate 209 moves before it stops, it will drive the horizontal plate 212 to move synchronously. The horizontal plate 212 will drive the connecting plate 208 to move synchronously. The connecting plate 208 will drive the L-shaped sliding plate 205 to move. The L-shaped sliding plate 205 will drive the water-absorbing sponge 207 to be located below the drain pipe 201, which is convenient for collecting water droplets. S3: Drainage: Under the action of the L-shaped slide plate 205 and the rectangular block 204, the water-absorbing sponge 207 will be squeezed, squeezing out the water inside the water-absorbing sponge 207 and discharging it out of the device from the rectangular groove 203. This prevents water from remaining inside the water-absorbing sponge 207, which could cause the sponge 207 to become moldy and affect its use. When the L-shaped slide plate 205 moves and squeezes the water-absorbing sponge 207, the rubber plate 206 on the top of the L-shaped slide plate 205 will block the drain outlet of the drain pipe 201, preventing external dust from entering the device and affecting the detection accuracy of the device. S4: Cleaning: After the threaded plate 209 is reset, it leaves the trapezoidal block 303. At this time, the rectangular push plate 302 will be reset under the elastic force of the limit spring 301 and push out the gas in the hollow box 3. The gas in the hollow box 3 is blown towards the filter plate 307 through the vent pipe 304 and the air blowing groove 305. Since the filter plate 307 will rotate with the threaded rod 105, the gas blown out of the air blowing groove 305 will be blown onto the filter plate 307 and remove the dust particles stuck in the holes of the filter plate 307, thus improving the cleaning effect of the filter plate 307.

[0032] The preferred embodiments of the present invention disclosed above are only for the purpose of illustrating the present invention; the preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementations described; obviously, many modifications and variations can be made based on the content of this specification; this specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and utilize the present invention; the present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for detecting formaldehyde content in engineered wood products using a high-sensitivity gas sensor, comprising a detection chamber (1), characterized in that, Also includes: A dehumidification mechanism is provided inside the testing chamber (1). The dehumidification mechanism includes a first mounting plate (101) and a second mounting plate (102) provided inside the testing chamber (1). A shaped cylinder (103) is provided on the first mounting plate (101) and the second mounting plate (102). A circular mounting frame (104) is provided inside the shaped cylinder (103). A threaded rod (105) is provided on the circular mounting frame (104). The dehumidification mechanism is used to remove excess moisture during the testing process. The drainage mechanism is installed inside the test box (1). The drainage mechanism includes a drainage groove (2) installed on the shaped cylinder (103). A drainage pipe (201) is installed on the shaped cylinder (103). The drainage pipe (201) has two outlets. Two water storage tanks (202) are installed inside the test box (1). The two ends of the drainage pipe (201) extend into the two water storage tanks (202) respectively. The drainage mechanism is used to discharge the residual water in the test box (1) out of the test box (1). The cleaning mechanism is set inside the detection box (1). The cleaning mechanism includes two hollow boxes (3) set inside the detection box (1). Limiting springs (301) are respectively set inside the two hollow boxes (3). Rectangular push plates (302) are respectively set at the ends of the two limiting springs (301) that are close to each other. The cleaning mechanism is used to blow air in reverse to clean dust. L-shaped sliding plates (205) are slidably installed inside the two water storage tanks (202). The front ends of the two L-shaped sliding plates (205) extend to the outside of the two water storage tanks (202). Rubber plates (206) are fixedly installed on the top of the two L-shaped sliding plates (205). Water-absorbing sponges (207) are fixedly installed on the back of the two L-shaped sliding plates (205). Connecting plates (208) are fixedly installed at the front ends of the two L-shaped sliding plates (205). The two connecting plates (208) slidably extend to the outside of the two water storage tanks (202). The ends of the two connecting plates (208) slidably penetrate the second mounting plate (102). A threaded plate (209) is threaded onto the threaded rod (105). A return spring (210) is fixedly installed on the back of the mounting plate (102). A ring plate (211) is fixedly installed at the end of the return spring (210). The ring plate (211) is in contact with the threaded plate (209). Two horizontal plates (212) are fixedly installed on the threaded plate (209). The two horizontal plates (212) are fixedly connected to two connecting plates (208) respectively. The cleaning mechanism includes trapezoidal blocks (303) fixedly installed on one side of two rectangular push plates (302), and the two trapezoidal blocks (303) extend out of the two hollow boxes (3) respectively at their close ends.

2. The device for detecting formaldehyde content in engineered wood products using a high-sensitivity gas sensor according to claim 1, characterized in that: The dehumidification mechanism includes a first mounting plate (101) and a second mounting plate (102) fixedly installed inside the detection box (1). A shaped cylinder (103) is fixedly installed on the first mounting plate (101) and the second mounting plate (102). A circular mounting bracket (104) is rotatably installed inside the shaped cylinder (103). A threaded rod (105) is rotatably installed through the first mounting plate (101) and the second mounting plate (102). The circular mounting bracket (104) is fixedly connected to the threaded rod (105).

3. The device for detecting formaldehyde content in engineered wood products using a high-sensitivity gas sensor according to claim 2, characterized in that: A permeation membrane (106) is fixedly installed on the circular mounting bracket (104). A drive motor (107) is fixedly installed inside the detection box (1). The output end of the drive motor (107) is fixedly connected to the threaded rod (105). Several air outlets (108) are opened on the mounting plate (102). A high-sensitivity gas sensor (109) is fixedly installed inside the detection box (1). Several exhaust holes (110) are opened on the top and bottom of the detection box (1). A handle (111) is fixedly installed on the back of the detection box (1).

4. The device for detecting formaldehyde content in engineered wood products using a high-sensitivity gas sensor according to claim 3, characterized in that: The drainage mechanism includes a drainage groove (2) opened on the irregular cylinder (103), a drainage pipe (201) fixedly installed on the irregular cylinder (103), two water storage tanks (202) fixedly installed on the bottom inner wall of the detection box (1), two rectangular grooves (203) respectively opened on the bottom of the two water storage tanks (202), and rectangular blocks (204) fixedly installed on the back of the two water storage tanks (202).

5. The device for detecting formaldehyde content in engineered wood products using a high-sensitivity gas sensor according to claim 1, characterized in that: Ventilation pipes (304) are fixedly installed on the front of the two hollow boxes (3), and the two ventilation pipes (304) pass through the second mounting plate (102) and extend into the irregular cylinder (103). Air blowing grooves (305) are opened on the front of the two ventilation pipes (304). A filter plate (307) is rotatably installed on the first mounting plate (101). The filter plate (307) is fixedly connected to the threaded rod (105). An annular plate (306) is fixedly installed on the detection box (1) and the first mounting plate (101).

6. The device for detecting formaldehyde content in engineered wood products using a high-sensitivity gas sensor according to claim 1, characterized in that: A cleaning plate (308) is rotatably sleeved on the threaded rod (105). The top end of the cleaning plate (308) is fixedly connected to the annular plate (306). A dust discharge groove (309) is opened on the annular plate (306). The bottom end of the cleaning plate (308) extends into the dust discharge groove (309). Several air inlet grooves (310) are opened on the front of the detection box (1). Strip grooves (311) are opened on the top and bottom of the detection box (1). A fan blade (312) is fixedly sleeved on the threaded rod (105).

7. A method for using a high-sensitivity gas sensor to detect formaldehyde content in engineered wood products, comprising the high-sensitivity gas sensor as described in claim 6, characterized in that... The steps are as follows: S1: Dehumidification: Since the gas contains moisture, when the gas passes through the permeation membrane (106), the moisture in the gas will pass through quantitatively, while the excess moisture will fall onto the permeation membrane (106). During the rotation of the threaded rod (105), the circular mounting bracket (104) will rotate. The circular mounting bracket (104) will drive the permeation membrane (106) to rotate and generate centrifugal force. The centrifugal force will throw the excess moisture on the permeation membrane (106) into the irregular cylinder (103), ensuring that no excess moisture enters the high-sensitivity gas sensor (109) and affects the detection effect. S2: Water absorption: Under the limiting action of the return spring (210) and the ring plate (211), the threaded plate (209) is kept stationary. At this time, the threaded plate (209) is in a semi-disengaged state. The corresponding threaded plate (209) will drive the horizontal plate (212) to move. The horizontal plate (212) will drive the connecting plate (208) to move synchronously. The connecting plate (208) will drive the L-shaped sliding plate (205) to move. The L-shaped sliding plate (205) will drive the water-absorbing sponge (207) to be located below the drain pipe (201) to facilitate the collection of water droplets. S3: Drainage: Under the action of the L-shaped slide plate (205) and the rectangular block (204), the water-absorbing sponge (207) will be squeezed, squeezing out the water in the water-absorbing sponge (207) and discharging it out of the device from the rectangular groove (203). This prevents water from remaining in the water-absorbing sponge (207) and causing it to mold and affect its use. When the L-shaped slide plate (205) moves and squeezes the water-absorbing sponge (207), the rubber plate (206) on the top of the L-shaped slide plate (205) will block the drain outlet of the drain pipe (201) to prevent external dust from entering the device and affecting the detection accuracy of the device. S4: Cleaning: After the threaded plate (209) is reset, the threaded plate (209) leaves the trapezoidal block (303). At this time, the rectangular push plate (302) will be reset under the elastic force of the limit spring (301) and push out the gas in the hollow box (3). The gas in the hollow box (3) is blown to the filter plate (307) through the vent pipe (304) and the air blowing groove (305). Since the filter plate (307) will rotate with the threaded rod (105), the gas blown out by the air blowing groove (305) will be blown onto the filter plate (307) and remove the dust particles stuck in the holes of the filter plate (307), thus improving the cleaning effect of the filter plate (307).

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