A climate chamber and method for detecting the formaldehyde purification efficiency of a veneered wood-based panel

Abstract

The present application relates to the technical field of environmental protection performance detection of decorative materials, and specifically discloses a climate chamber and method for detecting formaldehyde purification efficiency of veneered artificial board, which comprises a box body, a box door arranged on the side wall of the box body, a supporting assembly arranged in the box body and used for supporting a plurality of boards, and a gas circulating device communicated with the box body; the supporting assembly comprises a plurality of supporting plates horizontally and vertically distributed, a storage groove arranged on the upper side of each supporting plate, a cover plate arranged above the uppermost supporting plate, and a first driving device used for driving the cover plate and the supporting plates to move along the vertical direction; one board is clamped in one storage groove, and the depth of the storage groove is greater than the thickness of the board. The climate chamber and method for detecting formaldehyde purification efficiency of veneered artificial board can more accurately test the formaldehyde purification effect of the veneered board in the actual use process.

Description

Technical Field

[0001] This invention relates to the technical field of environmental performance testing of decorative materials, and more specifically, to a climate chamber and method for testing the formaldehyde purification efficiency of decorative engineered wood panels. Background Technology

[0002] Indoor formaldehyde pollution has become a significant issue affecting the safety of human living environments. Formaldehyde-reducing decorative engineered wood panels have become a mainstream material for interior decoration due to their combination of source control and end-of-pipe purification functions. Accurate testing of their formaldehyde purification efficiency is crucial for quality control in the industry.

[0003] Currently, the formaldehyde purification efficiency testing of formaldehyde-removing decorative engineered wood panels mainly adopts the static closed chamber method and the conventional dynamic climate chamber method. Both methods have significant technical defects: the static closed chamber method ignores the air flow and continuous formaldehyde release characteristics in the actual use environment, and the purification efficiency obtained in the test is far higher than the actual use effect, resulting in low data reference value; the conventional dynamic climate chamber method often uses multiple chambers to complete the background release of the board, blank control, and purification efficiency test separately, which is prone to equipment system errors and board parallel sample errors, and the airflow in the chamber is prone to short-circuiting, resulting in insufficient contact between formaldehyde and the board surface.

[0004] Meanwhile, conventional climate chambers mostly control ventilation through fans, making it difficult to achieve precise control of equal intake and exhaust volumes, which can easily lead to fluctuations in formaldehyde concentration within the chamber. Furthermore, the sealing structure of the panels is often an external cover, which is prone to leakage, affecting the accuracy of blank control tests, and cannot achieve decoupled adjustment of ventilation rate and surface wind speed, making it difficult to accurately quantify the impact of various environmental parameters on purification efficiency. Therefore, a formaldehyde purification efficiency testing climate chamber that can integrate multi-stage testing, achieve high detection accuracy, and provide controllable flow field and ventilation can be designed. Summary of the Invention

[0005] The purpose of this invention is to provide a climate chamber and method for testing the formaldehyde purification efficiency of decorative engineered wood panels, which can more accurately test the formaldehyde purification effect of the panels in actual use.

[0006] This invention is achieved through the following technical solution: The climate chamber for testing the formaldehyde purification efficiency of decorative engineered wood panels includes a chamber body, a door located on the side wall of the chamber body, a support assembly located inside the chamber body for supporting multiple panels, and a gas circulation device connected to the chamber body; the support assembly includes multiple horizontally and vertically distributed support plates, a storage slot on the upper side of the support plates, a cover plate located above the uppermost support plate, and a first driving device for driving the cover plate and the support plates to move vertically; one panel is fitted into one storage slot, the depth of the storage slot being greater than the thickness of the panel.

[0007] Furthermore, both the sidewall of the support plate and the sidewall of the cover plate are provided with multiple sliders, and the inside of the box is provided with multiple vertically arranged sliding rods; one slider is slidably mounted on one sliding rod.

[0008] Furthermore, multiple pads are provided on the lower side of the support plate and the lower side of the cover plate; when multiple support plates abut against each other, the pads abut against the upper surface of the plate.

[0009] Furthermore, the first driving device includes a first telescopic cylinder vertically disposed above the box body, and a plurality of connecting ropes disposed inside the box body; the cylinder body of the first telescopic cylinder is fixedly connected to the outer wall of the box body, and the movable end of the first telescopic cylinder passes through the outer wall of the box body and is fixedly connected to the cover plate; the plurality of sliders in the same vertical direction are connected by a connecting rope.

[0010] Furthermore, the bottom of the storage slot is provided with multiple spring clips.

[0011] Furthermore, the gas circulation device includes multiple air-blowing plates horizontally disposed within the housing, a first conduit connected to the air-blowing plates, a second conduit connected to the multiple first conduits and disposed outside the housing, a third conduit connected to the second conduits, a fan disposed on the third conduit, an exhaust plate disposed outside the housing, and multiple fourth conduits for connecting the housing and the exhaust plate; both the air-blowing plates and the exhaust plates are hollow structures, and the air-blowing plates and the exhaust plates are respectively disposed at opposite ends of the housing; the third conduit communicates with the exhaust plate, and multiple air-blowing holes are opened on the side of the air-blowing plates near the support plate.

[0012] Furthermore, when the cover plate moves to the top, the distance between adjacent support plates is equal to the distance between adjacent air blowing plates; it also includes a second driving device for driving the air blowing plates to move up and down, the portion of the first conduit inside the box is a flexible hose; the second driving device includes a connecting rod for connecting adjacent air blowing plates, and a second telescopic cylinder vertically disposed above the box; the cylinder body of the second telescopic cylinder is fixedly connected to the box, and the movable end of the second telescopic cylinder passes through the box and is fixedly connected to the air blowing plate.

[0013] Furthermore, the gas circulation device also includes a pair of coaxially arranged air exchange tanks on the outside of the housing, a piston slidably disposed in the air exchange tanks through a screw passing through the axial direction of the pair of air exchange tanks, a pair of suction pipes, and a pair of supply pipes; each air exchange tank has an exhaust pipe at both ends, a first air inlet pipe at both ends, and a second air inlet pipe on the side wall of the air exchange tank; the second air inlet pipe is connected to a formaldehyde gas source; each pair of supply pipes is connected to the second conduit, and each pair of supply pipes is connected to the opposite ends of the pair of air exchange tanks; each pair of suction pipes is connected to the exhaust plate, and each pair of suction pipes is connected to the opposite ends of the pair of air exchange tanks; the screw is sealed and threadedly connected to the piston, and the screw is sealed and rotatably connected to the air exchange tank; each suction pipe, supply pipe, exhaust pipe, first air inlet pipe, and second air inlet pipe is equipped with a valve.

[0014] Furthermore, the exhaust plate is equipped with a temperature regulating device and a humidity regulating device; the gas circulation device also includes a motor fixedly mounted on the side wall of the housing, a drive wheel mounted on the output shaft of the motor, a driven wheel fixedly mounted on one end of the screw, and a transmission belt for connecting the drive wheel and the driven wheel.

[0015] The present invention also provides a method for detecting the formaldehyde purification efficiency of decorative engineered wood panels, based on the above-mentioned climate chamber for detecting the formaldehyde purification efficiency of decorative engineered wood panels, comprising the following steps:

[0016] (1) Open the box door, put the plate to be tested into the storage slot of the support plate, close the box door, and use the first drive device to drive the cover plate and the support plate to move up so that there is a gap between the support plates;

[0017] (2) The gas inside the box is circulated by a gas circulation device. During the circulation process, fresh air without formaldehyde is intermittently introduced and an equal amount of air is discharged. The formaldehyde content in the box is detected after a certain period of time.

[0018] (3) Use the first driving device to drive the cover plate and the support plate to move down, so that the cover plate and the support plate are pressed together, sealing the plate between the support plates. The gas circulation device intermittently introduces air with a constant formaldehyde content into the box and discharges an equal amount of air. After a certain period of time, the formaldehyde content in the box is detected.

[0019] (4) Keep the gas flow parameters in step (3) unchanged, use the first driving device to drive the cover plate and support plate to move up, so that there is a gap between the support plates, so that the surface of the plate is exposed to the gas, and the formaldehyde content in the box is detected after a certain period of time.

[0020] The technical solution of the present invention has at least the following advantages and beneficial effects: The climate chamber and method for detecting the formaldehyde purification efficiency of decorative engineered wood panels of the present invention, in use, first places the panel to be tested (with the test side facing upwards) in the storage slot of the support plate through the chamber door. After closing the chamber door, a gas circulation device is used to introduce formaldehyde-free fresh air, and the air is circulated within the chamber. After a certain period of time, the formaldehyde content of the gas in the chamber is detected, thus detecting the formaldehyde release amount of the panel itself. Then, a driving device is used to drive the cover plate and support plate to descend, sealing the panel within the support plate and cover plate through their mutual contact. Simultaneously, a certain amount of formaldehyde is added to the gas circulation device to maintain a certain formaldehyde content in the gas within the chamber. After a certain period of time, once the formaldehyde content in the chamber stabilizes, the formaldehyde content of the gas in the chamber is measured. Then, the first driving device is used to move the cover plate and support plate upward, creating a gap between them to expose the board material. The board material can then absorb the formaldehyde in the chamber. After a certain period of time, the formaldehyde content in the chamber is measured again. By measuring the formaldehyde content three times, the absorption and purification efficiency of the board material for formaldehyde in the environment under gas flow conditions can be tested. This also eliminates the influence of formaldehyde released by the board material itself. Furthermore, the entire testing process uses the same board material, the entire device does not need to be turned on, and the gas parameters can remain relatively stable. Therefore, external factors have less influence on the measurement results, making the test results more accurate and more meaningful. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a climate chamber for detecting the formaldehyde purification efficiency of decorative artificial boards provided in Embodiment 1 of the present invention.

[0022] Figure 2 for Figure 1 Second perspective;

[0023] Figure 3 for Figure 1 The third perspective;

[0024] Figure 4 This is a sectional view of the air exchange tank along the vertical direction;

[0025] Figure 5 This is a sectional view of the box along the vertical direction;

[0026] Figure 6 A structural diagram of the supporting components;

[0027] Figure 7 for Figure 6 Second perspective;

[0028] Figure 8 for Figure 6 The third perspective;

[0029] Figure 9 This is a schematic diagram of the structure after the support plate and cover plate are overlapped;

[0030] Figure 10 This is a schematic diagram of the structure after the support plate and the sheet metal are combined;

[0031] Figure 11 This is a structural diagram of the support plate section.

[0032] Icons: 10-Box body, 11-Box door, 20-Support assembly, 21-Support plate, 22-Storage slot, 23-Lid, 24-First drive device, 241-First telescopic cylinder, 242-Connecting rope, 25-Slider, 26-Slide rod, 27-Padded block, 28-Spring, 30-Gas circulation device, 31-Blowing plate, 32-First duct, 33-Second duct, 34-Third duct, 35-Fan, 36-Exhaust Plate, 37-Fourth conduit, 38-Air inlet, 39-Second drive unit, 391-Second telescopic cylinder, 392-Connecting rod, 310-Air exchange tank, 311-Screw, 312-Piston, 313-Suction pipe, 314-Air supply pipe, 315-Exhaust pipe, 316-First air inlet pipe, 317-Second air inlet pipe, 318-Motor, 319-Drive wheel, 320-Driven wheel, 321-Transmission belt, 40-Plate. Detailed Implementation

[0033] Example 1

[0034] The following description, in conjunction with specific embodiments, further illustrates the point, as shown in the appendix. Figure 1 - Appendix Figure 11 As shown, the climate chamber for testing the formaldehyde purification efficiency of decorative engineered wood panels in this embodiment includes a chamber body 10, a chamber door 11 disposed on the side wall of the chamber body 10, a support assembly 20 disposed inside the chamber body 10 for supporting multiple panels 40, and a gas circulation device 30 communicating with the chamber body 10; the support assembly 20 includes multiple horizontally distributed support plates 21, a storage slot 22 opened on the upper side of the support plate 21, a cover plate 23 disposed above the uppermost support plate 21, and a first driving device 24 for driving the cover plate 23 and the support plate 21 to move in the vertical direction; a panel 40 is inserted into a storage slot 22, and the depth of the storage slot 22 is greater than the thickness of the panel 40. Specifically, during use, the board 40 to be tested is first placed in the storage slot 22 of the support plate 21 (test side facing upwards) through the door 11. After closing the door 11, fresh air free of formaldehyde is introduced using the gas circulation device 30, and the air is circulated within the chamber 10. After a certain period of time, the formaldehyde content of the gas in the chamber 10 is measured, thus detecting the formaldehyde release of the board 40 itself. Then, the first driving device 24 drives the cover plate 23 and the support plate 21 to descend, sealing the board 40 within the support plate 21 and cover plate 23 through the mutual contact of the cover plate 23 and the support plate 21 (as shown in the attached diagram). Figure 9 (As shown in the attached diagram), simultaneously, a certain amount of formaldehyde is added to the gas circulation device 30 to maintain a certain formaldehyde content in the gas in the chamber 10. After a certain period of time, once the formaldehyde content in the chamber 10 stabilizes, the formaldehyde content in the gas in the chamber 10 is detected. Then, a driving device is used to drive the cover plate 23 and the support plate 21 to move upward, creating a gap between the cover plate 23 and the support plate 21, thus exposing the board 40 (as shown in the attached diagram). Figure 6-7 As shown, the board 40 can absorb formaldehyde in the chamber 10. After a certain period of time, the formaldehyde content in the chamber 10 is detected. By detecting the formaldehyde content three times, the absorption and purification efficiency of the board 40 on the formaldehyde content in the environment under the actual gas flow conditions can be obtained. It can also eliminate the influence of its own formaldehyde release. Furthermore, the same board 40 is used throughout the entire test process. The entire device does not need to be turned on, and the gas parameters can always remain relatively stable. Therefore, the influence of external factors on the measurement results is smaller, and the test results are more accurate and have more reference value.

[0035] In this embodiment, both the sidewalls of the support plate 21 and the cover plate 23 are provided with multiple sliders 25, and the inside of the housing 10 is provided with multiple vertically arranged sliding rods 26; one slider 25 is slidably mounted on one sliding rod 26. Specifically, through the cooperation of the sliders 25 and the sliding rods 26, the support plate 21 can be made to move stably in the vertical direction.

[0036] In this embodiment, multiple pads 27 are provided on the lower side of the support plate 21 and the lower side of the cover plate 23. When the multiple support plates 21 abut against each other, the pads 27 abut against the upper surface of the plate 40. Specifically, the function of the pads 27 is to prevent the lower side of the support plate 21 from directly contacting the surface of the plate 40, thus preventing the support plate 21 from affecting the plate 40. The pads 27 can be positioned between the support plate 21 and the plate 40, creating a gap between them. Furthermore, when the support plates 21 are in contact with each other, the pads 27 can also press the plate 40 into the storage groove 22. It should be noted that a sealing strip can be provided between the support plates 21 to ensure a sealing effect on the plate 40. At this time, the air flowing in the box 10 will not come into contact with the plate 40. If the gas flowing in the box 10 contains formaldehyde, the formaldehyde content (C1) of the gas in the box 10 can be measured after a certain period of time to obtain a stable formaldehyde content in the box 10 as a blank control.

[0037] In this embodiment, the first driving device 24 includes a first telescopic cylinder 241 vertically disposed above the housing 10, and multiple connecting ropes 242 disposed inside the housing 10. The cylinder body of the first telescopic cylinder 241 is fixedly connected to the outer wall of the housing 10, and the movable end of the first telescopic cylinder 241 passes through the outer wall of the housing 10 and is fixedly connected to the cover plate 23. Multiple sliders 25 in the same vertical direction are connected by a connecting rope 242. Specifically, the first telescopic cylinder 241 can drive the uppermost cover plate 23 to move up and down, and the cover plate 23 can drive multiple support plates 21 to move up through the connecting rope 242. When the connecting rope 242 is fully straightened, the distance between the cover plate 23 and the support plate 21 is the same, and at this time the airflow flowing through the housing 10 will come into contact with the plate 40. When the gas in the chamber 10 does not contain formaldehyde, the formaldehyde release of the board 40 itself can be determined by measuring the formaldehyde content of the gas in the chamber 10 (C2). If the gas flowing in the chamber 10 contains formaldehyde (i.e. there is a stable source of formaldehyde release), the formaldehyde content of the gas in the chamber 10 can be detected (C3), and compared with the formaldehyde content measured above (C1+C2-C3), the absorption and purification effect of the board 40 on formaldehyde can be calculated.

[0038] In this embodiment, the bottom of the storage slot 22 is provided with multiple spring tabs 28. Specifically, when there is a gap between the support plates 21, the spring tabs 28 can lift the plate 40 so that the upper surface of the plate 40 is exposed to the support plate 21, so that the air flowing in the box 10 can better contact the surface of the plate 40.

[0039] The gas circulation device 30 in this embodiment includes multiple air-blowing plates 31 horizontally disposed within the housing 10, first conduits 32 connected to the air-blowing plates 31, second conduits 33 connected to the multiple first conduits 32 and disposed outside the housing 10, third conduits 34 connected to the second conduits 33, a fan 35 disposed on the third conduit 34, an exhaust plate 36 disposed outside the housing 10, and multiple fourth conduits 37 for connecting the housing 10 and the exhaust plate 36. Both the air-blowing plates 31 and the exhaust plate 36 are hollow structures, and are respectively disposed at opposite ends of the housing 10. The third conduit 34 communicates with the exhaust plate 36, and the air-blowing plates 31 have multiple air-blowing holes 38 on the side near the support plate 21. Specifically, the fan 35 promotes the circulation of air within the housing 10 and the various pipes, and during the circulation process, it also periodically exhausts air and then draws in an equal amount of air to simulate the ventilation effect of a real environment. The fan 35 extracts the gas from the chamber 10 through the third duct 34, the exhaust plate 36, and the fourth duct 37, and then sends it into the second duct 33, the first duct 32, and the blowing plate 31. Finally, it blows the gas into the chamber 10 through the blowing hole 38 to complete the circulation. The circulating flow of the gas can better contact the board 40 and better test the formaldehyde absorption and purification effect of the board 40.

[0040] In this embodiment, when the cover plate 23 moves to the top, the distance between adjacent support plates 21 is equal to the distance between adjacent air blowing plates 31; it also includes a second driving device 39 for driving the air blowing plates 31 to move up and down, and the portion of the first conduit 32 located inside the housing 10 is a flexible hose; the second driving device 39 includes a connecting rod 392 for connecting adjacent air blowing plates 31, and a second telescopic cylinder 391 vertically located above the housing 10; the cylinder body of the second telescopic cylinder 391 is fixedly connected to the housing 10, and the movable end of the second telescopic cylinder 391 passes through the housing 10 and is fixedly connected to the air blowing plate 31. Specifically, the second telescopic cylinder 391 and the connecting rod 392 can drive multiple air blowing plates 31 to move vertically. This allows adjustment of the vertical distance between the air blowing plates 31 and the board 40. The closer the air blowing plates 31 are to the board 40, the greater the air velocity on the surface of the board 40, and vice versa. This can simulate the formaldehyde absorption and purification effect of the board 40 under different air velocities. In this way, it is only necessary to use the second telescopic cylinder 391 to pull the air blowing plates 31, without adjusting the wind speed of the fan 35. Therefore, the gas velocity in the box 10 and each pipe will be more controllable.

[0041] The gas circulation device 30 in this embodiment also includes a pair of air exchange tanks 310 coaxially disposed on the outside of the housing 10, a pair of pistons 312 slidably disposed in the air exchange tanks 310 and sealed by a screw 311 passing through the axial direction of the pair of air exchange tanks 310, a pair of suction pipes 313, and a pair of supply pipes 314; both ends of the air exchange tanks 310 are provided with exhaust pipes 315, both ends of the air exchange tanks 310 are provided with first air inlet pipes 316, and the side wall of the air exchange tanks 310 is provided with second air inlet pipes 317; the second air inlet pipes 317 are connected to the formaldehyde gas source; a pair of supply pipes 314... All air pipes 314 are connected to the second conduit 33, and a pair of air supply pipes 314 are respectively connected to the opposite ends of a pair of air exchange tanks 310; a pair of air extraction pipes 313 are both connected to the exhaust plate 36, and a pair of air extraction pipes 313 are respectively connected to the opposite ends of a pair of air exchange tanks 310; the screw 311 is sealed and threadedly connected to the piston 312, and the screw 311 is sealed and rotatably connected to the air exchange tank 310; the air extraction pipe 313, air supply pipe 314, exhaust pipe 315, first air inlet pipe 316, and second air inlet pipe 317 are all equipped with valves. Specifically, the gas in chamber 10 is not constant; instead, new gas (containing or not containing formaldehyde) is intermittently introduced, followed by the exhaust of an equal amount of gas. This simulates ventilation and air exchange. This operation is performed by the air exchange tank 310. The specific principle is as follows: a formaldehyde gas source delivers a certain amount of high-concentration formaldehyde standard gas into the air exchange tank 310 through the second inlet pipe 317. When the piston 312 moves away from the inlet pipe 314, the air exchange tank 310 draws in purified air from the outside through the first inlet pipe 316. The formaldehyde is diluted and fully dispersed in the air exchange tank 310. The piston 312 then moves the air exchange tank 310... 10. The air on the other side is discharged to the outside through the exhaust pipe 315 (at this time, the suction pipe 313 and the supply pipe 314 of the air exchange tank 310 are both closed); at the same time, when the piston 312 in the other air exchange tank 310 moves (the two pistons 312 move in the same direction, or the same effect can be achieved by adjusting the position of each pipe so that the two pistons 312 move in opposite directions), the piston 312 sends the formaldehyde air in the air exchange tank 310 into the second conduit 33 through the supply pipe 314, and the suction pipe 313 draws the gas in the exhaust plate 36 into the other side of the piston 312 in the air exchange tank 310, thus achieving the effect of air exchange. When the piston 312 moves to the end of the air exchange tank 310, before moving in the opposite direction, the valves on each pipe of the two air exchange tanks 310 need to switch their opening and closing states. That is, only one air exchange tank 310 is connected to the box 10 at a time. In this way, the air exchange tank 310 that is not connected can not only discharge the waste formaldehyde air inside, but also allow the new formaldehyde to be fully dispersed in the air exchange tank 310. This can ensure a very stable formaldehyde gas source.It should be noted that, to prevent fresh gas entering the second conduit 33 from the gas exchange tank 310 from directly re-entering the gas exchange tank 310 through the exhaust plate 36, a pause can be made for a certain period of time after the gas in the gas exchange tank 310 enters the second conduit 33 (pause the movement of the piston 312 and close the relevant valves), allowing the gas in the housing 10 to circulate several times before new gas is introduced. This ensures that the gas fully contacts the plate 40. Furthermore, the wind speed of the fan 35 can be temporarily reduced during ventilation.

[0042] In this embodiment, the exhaust plate 36 is equipped with a temperature regulating device and a humidity regulating device. The gas circulation device 30 also includes a motor 318 fixedly mounted on the side wall of the housing 10, a drive wheel 319 mounted on the output shaft of the motor 318, a driven wheel 320 fixedly mounted on one end of the screw 311, and a transmission belt 321 connecting the drive wheel 319 and the driven wheel 320. Specifically, the temperature and humidity of the gas can be adjusted in real time by the temperature regulating device and the humidity regulating device in the exhaust plate 36 to keep it relatively stable or adjust it to a preset value. The piston 312 and the inner wall of the gas exchange tank 310 can be limited by some groove structure to prevent the piston 312 from rotating. The motor 318 can drive the screw 311 to rotate through the transmission belt 321. The motor 318 can also drive the screw 311 to rotate through gear transmission or sprocket and chain transmission.

[0043] Example 2

[0044] This embodiment provides a method for detecting the formaldehyde purification efficiency of decorative engineered wood panels based on Embodiment 1, which includes the following steps:

[0045] (1) Open the box door, put the plate to be tested into the storage slot of the support plate, close the box door, and use the first drive device to drive the cover plate and the support plate to move up so that there is a gap between the support plates;

[0046] (2) The gas inside the box is circulated by a gas circulation device. During the circulation process, fresh air without formaldehyde is intermittently introduced and an equal amount of air is discharged. The formaldehyde content in the box is detected after a certain period of time.

[0047] (3) Use the first driving device to drive the cover plate and the support plate to move down, so that the cover plate and the support plate are pressed together, sealing the plate between the support plates. The gas circulation device intermittently introduces air with a constant formaldehyde content into the box and discharges an equal amount of air. After a certain period of time, the formaldehyde content in the box is detected.

[0048] (4) Keep the gas flow parameters in step (3) unchanged, use the first driving device to drive the cover plate and support plate to move up, so that there is a gap between the support plates, so that the surface of the plate is exposed to the gas, and the formaldehyde content in the box is detected after a certain period of time.

[0049] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A climate chamber for testing the formaldehyde purification efficiency of decorative engineered wood panels, characterized in that: It includes a housing, a door located on the side wall of the housing, a support assembly located inside the housing for supporting multiple plates, and a gas circulation device connected to the housing. The support assembly includes multiple horizontally distributed support plates, a storage slot on the upper side of the support plates, a cover plate located above the uppermost support plate, and a first driving device for driving the cover plate and the support plates to move vertically. One of the plates is fitted into one of the storage slots, the depth of which is greater than the thickness of the plate; Both the sidewall of the support plate and the sidewall of the cover plate are provided with multiple sliders, and the inside of the box is provided with multiple vertically arranged sliding rods; one slider slides on one sliding rod; the first driving device includes a first telescopic cylinder vertically arranged above the box and multiple connecting ropes arranged inside the box; the cylinder body of the first telescopic cylinder is fixedly connected to the outer wall of the box, and the movable end of the first telescopic cylinder passes through the outer wall of the box and is fixedly connected to the cover plate; multiple sliders in the same vertical direction are connected by a connecting rope; the gas circulation device includes multiple air blowing plates horizontally arranged inside the box, and a first... The enclosure includes a conduit, a second conduit connected to multiple first conduits and located outside the housing, a third conduit connected to the second conduits, a fan mounted on the third conduit, an exhaust plate located outside the housing, and multiple fourth conduits connecting the housing and the exhaust plate; both the air blowing plate and the exhaust plate are hollow structures, and are respectively located at opposite ends of the housing; the third conduit communicates with the exhaust plate, and the air blowing plate has multiple air blowing holes on the side near the support plate; when the cover plate is moved to the top, the distance between adjacent support plates is equal to the distance between adjacent air blowing plates; and also includes... The system includes a second driving device for driving the air blowing plate to move up and down; the portion of the first conduit inside the housing is a flexible hose; the second driving device includes a connecting rod for connecting adjacent air blowing plates, and a second telescopic cylinder vertically positioned above the housing; the cylinder body of the second telescopic cylinder is fixedly connected to the housing, and the movable end of the second telescopic cylinder passes through the housing and is fixedly connected to the air blowing plate; the gas circulation device also includes a pair of air exchange tanks coaxially positioned outside the housing, a pair of screws passing through the pair of air exchange tanks axially, a piston slidably positioned in the air exchange tanks, a pair of suction pipes, and a pair of delivery pipes; the gas exchange... Both ends of the gas tank are equipped with exhaust pipes, and both ends of the gas exchange tank are equipped with first air inlets. The side wall of the gas exchange tank is equipped with a second air inlet pipe. The second air inlet pipe is connected to a formaldehyde gas source. A pair of air supply pipes are both connected to the second conduit, and the pair of air supply pipes are respectively connected to the opposite ends of the pair of gas exchange tanks. A pair of air extraction pipes are both connected to the exhaust plate, and the pair of air extraction pipes are respectively connected to the opposite ends of the pair of gas exchange tanks. The screw is threadedly connected to the piston and is rotatably connected to the gas exchange tank. Valves are provided for the air extraction pipe, the air supply pipe, the exhaust pipe, the first air inlet pipe, and the second air inlet pipe.

2. The climate chamber for detecting the formaldehyde purification efficiency of decorative engineered wood panels according to claim 1, characterized in that: Multiple pads are provided on the lower side of the support plate and the lower side of the cover plate; When multiple support plates abut against each other, the pad block abuts against the upper surface of the plate.

3. The climate chamber for detecting the formaldehyde purification efficiency of decorative engineered wood panels according to claim 1, characterized in that: The bottom of the storage slot is equipped with multiple spring clips.

4. The climate chamber for detecting the formaldehyde purification efficiency of decorative engineered wood panels according to claim 1, characterized in that: The exhaust plate is equipped with a temperature regulation device and a humidity regulation device. The gas circulation device also includes a motor fixedly mounted on the side wall of the housing, a drive wheel mounted on the output shaft of the motor, a driven wheel fixedly mounted on one end of the screw, and a transmission belt for connecting the drive wheel and the driven wheel.

5. A method for detecting the formaldehyde purification efficiency of decorative engineered wood panels, based on the climate chamber for detecting the formaldehyde purification efficiency of decorative engineered wood panels as described in any one of claims 1-4, characterized in that, Includes the following steps: (1) Open the box door, put the plate to be tested into the storage slot of the support plate, close the box door, and use the first drive device to drive the cover plate and the support plate to move up so that there is a gap between the support plates; (2) The gas inside the box is circulated by a gas circulation device. During the circulation process, fresh air without formaldehyde is intermittently introduced and an equal amount of air is discharged. The formaldehyde content in the box is detected after a certain period of time. (3) Use the first driving device to drive the cover plate and the support plate to move down, so that the cover plate and the support plate are pressed together, sealing the plate between the support plates. The gas circulation device intermittently introduces air with a constant formaldehyde content into the box and discharges an equal amount of air. After a certain period of time, the formaldehyde content in the box is detected. (4) Keep the gas flow parameters in step (3) unchanged, use the first driving device to drive the cover plate and support plate to move up, so that there is a gap between the support plates, so that the surface of the plate is exposed to the gas, and the formaldehyde content in the box is detected after a certain period of time.

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