Colorimetric detection device for formaldehyde release in SPC floor production

Abstract

The invention relates to the technical field of material detection, and discloses an SPC floor production formaldehyde release colorimetric detection device which comprises a release chamber, an absorption chamber arranged on one side of the release chamber and a detection chamber arranged on one side of the absorption chamber, and a cuvette and an optical detection device located above the cuvette are arranged in the detection chamber. A liquid outlet corresponding to the cuvette is formed in one end of the absorption chamber, an electromagnetic valve is mounted on the liquid outlet, and a pressure cavity is formed above the release chamber; the device further comprises a residue removing mechanism. Through the lifting of the piston plate and the integrated mechanical linkage design of the release chamber, the absorption chamber, the detection chamber, the pressure cavity and the residue removal mechanism, the technical problems that in an existing colorimetric detection device, links such as gas conveying, absorption and residue removal are dispersed and independent and depend on multiple power sources are solved, cooperative and efficient operation of the whole formaldehyde detection process is achieved, and the detection efficiency is improved. The whole structure of the device is simplified, energy consumption is reduced, and precise synchronization of actions of all links is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of materials testing technology, and in particular to a colorimetric detection device for formaldehyde emission from SPC flooring production. Background Technology

[0002] SPC flooring is a new type of flooring material made primarily from polyvinyl chloride resin and natural stone powder through processes such as extrusion and lamination. With its advantages of being waterproof, wear-resistant, easy to install, and environmentally friendly, it is widely used in residential and commercial indoor settings. However, some additives and adhesives used in the production process may release formaldehyde. Since formaldehyde is a volatile harmful gas, long-term exposure can endanger human health. Therefore, formaldehyde emission is a core indicator for SPC flooring product quality testing and must meet relevant national standards. Colorimetric detection is a commonly used technique for quantitative formaldehyde detection. It involves the specific reaction of formaldehyde with a specific colorimetric reagent to generate a colored compound, and then the absorbance of the compound is measured based on optical principles to calculate the formaldehyde concentration. Due to its relatively simple operation and controllable cost, it is widely used in the field of formaldehyde testing for wood-based panels.

[0003] However, existing colorimetric testing devices have certain shortcomings in practical applications in SPC flooring production scenarios: the gas delivery, absorption reaction, and residue removal processes of the device rely heavily on independent power sources and control modules. Gas delivery requires a separate air pump, and residue removal requires a dedicated exhaust fan. Each module also requires its own independent control circuit. This not only results in higher overall device costs but also relatively higher energy consumption, significantly increasing equipment failure rates and maintenance costs. Furthermore, the independently controlled processes are difficult to coordinate precisely, leading to low testing efficiency. This makes it unsuitable for the high-efficiency requirements of batch continuous testing in production scenarios, severely restricting the efficiency of the testing process and production line integration. Summary of the Invention

[0004] The technical problem this invention aims to solve is that existing SPC flooring formaldehyde colorimetric detection devices rely on independent power sources and control modules for each stage, resulting in high costs, energy consumption, and maintenance costs. Furthermore, the coordination between stages is poor, and the detection efficiency is low, making them unsuitable for batch testing needs in production scenarios. Therefore, we propose an SPC flooring formaldehyde release colorimetric detection device.

[0005] To achieve the above objectives, this application adopts the following technical solution: a formaldehyde emission colorimetric detection device for SPC flooring production, comprising a release chamber, an absorption chamber disposed on one side of the release chamber, and a detection chamber disposed on one side of the absorption chamber. The detection chamber is provided with a cuvette and an optical detection device located above the cuvette. One end of the absorption chamber is provided with a drain port corresponding to the cuvette, and a solenoid valve is installed on the drain port. A pressure chamber is provided above the release chamber. A piston plate is vertically and movably disposed inside the pressure chamber. A first air inlet is provided at the upper end of the pressure chamber. An air outlet communicating with the absorption chamber is provided at the lower end of the pressure chamber, and a one-way valve is provided on the air outlet. A drive source for driving the piston plate to rise and fall is provided at the top of the pressure chamber.

[0006] It also includes a residue removal mechanism, which includes a first exhaust port located on one side of the release chamber. A rotating shaft is rotatably installed in the first exhaust port, and a fan blade is mounted on the rotating shaft. A turntable is rotatably installed on one end of the first exhaust port located inside the release chamber. One end of the rotating shaft extends to the inside of the release chamber and is equipped with a second gear that rotates in one direction. Corresponding through holes are provided on the side wall of the turntable and the end of the first exhaust port. A gear ring is installed on the outer side of the turntable. A traction frame is provided above the piston plate. The output end of the drive source is connected to the traction frame. A T-shaped traction pin that movably engages with the piston plate is installed at the bottom of the traction frame. A second air inlet is provided on the piston plate, and a one-way valve is installed on the second air inlet. A drive assembly for driving the rotating shaft and the turntable to rotate is provided on the traction frame.

[0007] Preferably, the drive assembly includes a vertical rod mounted on the traction frame and extending below the piston plate, with a second rack plate corresponding to and adapted to the second gear mounted on one side of the vertical rod;

[0008] Both the upper and lower ends of the upright are provided with rotating grooves. The rotating grooves are equipped with gear teeth that correspond to and are adapted to the gear ring. A torsion spring is installed between the end of the gear teeth and the inner wall of the rotating groove. In the initial state of the torsion spring, the gear teeth at the upper end of the upright can flip upward and the gear teeth at the lower end of the upright can flip downward.

[0009] Preferably, one end edge of the turntable is provided with a convex shaft extending to the side of the first exhaust port, and the side of the first exhaust port is provided with a pair of stop blocks corresponding to the convex shaft.

[0010] Preferably, a second exhaust port is provided at the upper end of the absorption chamber.

[0011] Preferably, the drive source is a cylinder or an electric push rod, and the output shaft of the drive source is bolted to the traction frame.

[0012] Preferably, a stirring shaft is rotatably arranged in the absorption chamber, one end of the stirring shaft extends to the inner side of the release chamber and is rotatably arranged in one direction with a first gear, and a first rack plate corresponding to and adapted to the first gear is provided at one end of the bottom of the piston plate.

[0013] Preferably, the stirring shaft has a hollow structure and nozzles are evenly arranged on the stirring shaft. An air delivery chamber corresponding to the stirring shaft is provided at the junction of the release chamber and the absorption chamber. The side wall of the stirring shaft corresponding to the air delivery chamber is provided with a slot, and the air delivery port is connected to the air delivery chamber.

[0014] Preferably, the release chamber is provided with a guide frame corresponding to the first rack plate and the upright, and a linear guide rail is provided on the guide frame, with one side of the upright and the first rack plate movably connected to the linear guide rail.

[0015] Preferably, the outer ends of the first and second exhaust ports are used to connect to an external gas purification device.

[0016] Preferably, the optical detection device is a colorimeter.

[0017] The technical effects and advantages of this invention are as follows:

[0018] In this invention, the integrated mechanical linkage design of the piston plate lifting and releasing chamber, absorption chamber, detection chamber, pressure chamber, and residue removal mechanism solves the technical pain points of existing colorimetric detection devices where gas delivery, absorption, and residue removal are scattered and independent, and rely on multiple power sources. This achieves coordinated and efficient operation of the entire formaldehyde detection process. The linkage design allows a single movement of the piston plate to simultaneously drive multiple key processes such as gas pressurization and delivery, dispersion, residue replacement, and exhaust, without the need for additional motors or control modules. This simplifies the overall structure of the device, reduces energy consumption, and ensures precise synchronization of the actions of each stage, providing a core guarantee for the stability and reliability of the detection results.

[0019] In this invention, regarding formaldehyde absorption efficiency, the piston plate descends, causing the hollow stirring shaft to rotate. Formaldehyde gas is then uniformly released into the absorption liquid in the form of tiny bubbles through nozzles on the surface of the stirring shaft, increasing the gas-liquid contact area. Simultaneously, the rotation of the stirring shaft drives the absorption liquid to flow, preventing bubble aggregation and ensuring that formaldehyde and the colorimetric reagent can fully react. This effectively solves the problem of low absorption efficiency and low detection results caused by insufficient gas-absorption liquid contact in the prior art, significantly improving the integrity of formaldehyde capture and the uniformity of the colorimetric reaction. Attached Figure Description

[0020] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0023] Figure 3 This is a structural schematic diagram of the piston plate, stirring shaft, and traction frame of the present invention in a disassembled state;

[0024] Figure 4 This is a schematic diagram of the structure of the first exhaust port of the present invention;

[0025] Figure 5 This is a schematic diagram of the first exhaust port, turntable, and rotating shaft of the present invention in a disassembled state.

[0026] Figure 6 For the present invention Figure 5 A structural diagram from another perspective based on the above;

[0027] Figure 7 This is a structural schematic diagram of the traction frame and piston plate of the present invention in a disassembled state;

[0028] Figure 8 This is a schematic diagram of the structure of the gear teeth and rotating groove of the present invention in a disassembled state;

[0029] Figure 9 This is a schematic cross-sectional view of the upright of the present invention.

[0030] Legend: 1. Release chamber; 2. Absorption chamber; 3. Detection chamber; 4. Drive source; 5. First exhaust port; 6. Second exhaust port; 7. Cuvette; 8. Pressure chamber; 9. First air inlet; 10. Drain port; 11. Optical detection device; 12. Piston plate; 13. Vertical rod; 14. First rack plate; 15. Traction frame; 16. Stirring shaft; 17. First gear; 18. Air inlet; 19. Slot; 20. Air inlet chamber; 21. Guide frame; 22. Second rack plate; 23. Turntable; 24. Second gear; 25. Gear ring; 26. Stop block; 27. Cam shaft; 28. Rotating shaft; 29. ​​Fan blade; 30. Through hole; 31. T-shaped traction pin; 32. Gear tooth; 33. Rotating groove; 34. Torsion spring; 35. Second air inlet. Detailed Implementation

[0031] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0032] For reference Figures 1-9As shown, a formaldehyde emission colorimetric detection device for SPC flooring production includes a release chamber 1 and an absorption chamber 2 for storing the absorbent liquid on one side of the release chamber 1. A door is provided on one side of the release chamber 1 for convenient removal and placement of the flooring and internal maintenance. The absorbent liquid in the absorption chamber 2 is preferably an acetylacetone-ammonium acetate buffer solution. Its core principle is that, under normal temperature conditions, acetylacetone and formaldehyde undergo a condensation reaction in the ammonium acetate buffer system to generate a stable yellow compound, diacetyl dihydrorutidine. This product specifically reacts only with formaldehyde and does not interfere with other volatile substances released from the SPC flooring. Furthermore, it reacts at 412 nm. The reagent exhibits a strong characteristic absorption peak at a specific wavelength, precisely matching the detection requirements of optical detection devices. Furthermore, the reagent preparation is simple, cost-effective, and highly stable, with absorbance remaining stable for 2-8 hours after color development, making it suitable for batch continuous detection in this production scenario. A detection chamber 3 is located on the side of the absorption chamber 2 furthest from the release chamber 1. A cuvette 7 is positioned at the lower end of the inner cavity of the detection chamber 3, and an optical detection device 11 is positioned above the cuvette 7 at the upper end of the inner cavity of the detection chamber 3. The optical detection device is preferably a colorimeter, specifically comprising a monochromatic LED with a center wavelength of 412 nm. The system comprises a light source, collimating lens, aperture, 1cm optical path standard detection channel, silicon photodiode, and a microcontroller signal processing unit. Its detection principle is based on Beer-Lambert's law: the concentration of the yellow compound in the absorbing liquid is directly proportional to the absorbance; the higher the formaldehyde concentration, the higher the compound concentration, the greater the absorption of 412nm monochromatic light, and the weaker the transmitted light intensity. During detection, the monochromatic light emitted by the light source is collimated into parallel light by the collimating lens. After the spot size is controlled by the aperture, it penetrates perpendicularly through the colorimetric absorbing liquid in cuvette 7. The transmitted light is received by the silicon photodiode and converted into an electrical signal. After signal amplification and A / D conversion, the microcontroller calls a pre-stored formaldehyde concentration-absorbance standard curve to automatically calculate the corresponding formaldehyde release amount, and finally outputs the result in digital form. The entire detection process requires no manual intervention, and the response time is ≤3 seconds. The detection accuracy is ≤ ±5%, and it is compatible with the installation and automated detection process of the sealed detection chamber 3. One end of the absorption chamber 2 is provided with a drain port 10 corresponding to the cuvette 7. A solenoid valve is installed on the drain port 10. The upper end of the absorption chamber 2 is provided with a second exhaust port 6, which is used to discharge the absorbed gas. A pressure chamber 8 is provided above the release chamber 1. A piston plate 12 is vertically and movably sealed inside the pressure chamber 8. A first air inlet 9 is provided at the upper end of the pressure chamber 8. The first air inlet 9 is used to introduce clean gas, which can be filtered through a filter screen and activated carbon before being introduced. The lower end of the pressure chamber 8 is provided with an air supply port 18 that communicates with the absorption chamber 2. A one-way valve is provided on the air supply port 18. The one-way valve is used for the gas in the pressure chamber 8 to enter the absorption chamber 2. The top of the pressure chamber 8 is provided with a drive source 4 for driving the piston plate 12 to rise and fall. The drive source 4 is preferably a cylinder or an electric telescopic rod.

[0033] To eliminate residual formaldehyde gas in the release chamber 1, a residue removal mechanism is also provided. In a preferred embodiment, the residue removal mechanism includes a first exhaust port 5 located on one side of the release chamber 1. A rotating shaft 28 is rotatably mounted in the first exhaust port 5, and a fan blade 29 is mounted on the rotating shaft 28. A turntable 23 is rotatably mounted on the inner end of the first exhaust port 5 within the release chamber 1. One end of the rotating shaft 28 extends to the inner side of the release chamber 1 and is unidirectionally mounted with a second gear 24 via a one-way bearing. The rotating shaft 28 is rotatably connected to the center of the end of the first exhaust port 5 and the center of the turntable 23 via bearings. Corresponding through holes 30 are provided on the side wall of the turntable 23 and the end of the first exhaust port 5. A gear ring 25 is mounted on the outer side of the turntable 23. A traction frame 15 is provided above the piston plate 12. The output shaft end of the drive source 4 is bolted to the traction frame 15. A T-shaped traction pin 31 that movably engages with the piston plate 12 is mounted at the bottom of the traction frame 15. A second air inlet 35 is provided on the plate 12, and a one-way valve is installed on the second air inlet 35. The one-way valve is used for the gas above the piston plate 12 to enter the space below the piston plate 12. A drive assembly for driving the rotating shaft 28 and the turntable 23 to rotate is provided on the traction frame 15. As a preferred embodiment, the drive assembly includes a vertical rod 13 installed on the traction frame 15 and extending to the bottom of the piston plate 12. The vertical rod 13 and the piston plate 12 are movably sealed. A second rack plate 22 corresponding to and adapted to the second gear 24 is installed on one side of the vertical rod 13. Multiple evenly distributed rotating grooves 33 are provided at both the upper and lower ends of the vertical rod 13. Gear teeth 32 corresponding to and adapted to the gear ring 25 are rotatably arranged in the rotating grooves 33. A torsion spring 34 is installed between the end of the gear teeth 32 and the inner wall of the rotating groove 33. When the torsion spring 34 is in its initial state, the gear teeth 32 at the upper end of the vertical rod 13 can be flipped upward and the gear teeth 32 at the lower end of the vertical rod 13 can be flipped downward.

[0034] To facilitate the restriction of the turntable 23, a convex shaft 27 extending to the side of the first exhaust port 5 is provided at one end edge of the turntable 23, and a pair of stop blocks 26 corresponding to the convex shaft 27 are provided on the side of the first exhaust port 5.

[0035] To achieve rapid and uniform absorption of formaldehyde gas by the absorbent liquid, a hollow stirring shaft 16 is rotatably installed in the absorption chamber 2. One end of the stirring shaft 16 extends to the inner side of the release chamber 1 and is equipped with a first gear 17 that rotates in one direction. A first rack plate 14 corresponding to and adapted to the first gear 17 is provided at one end of the piston plate 12. Multiple nozzles are evenly arranged on the stirring shaft 16. An air delivery chamber 20 corresponding to the stirring shaft 16 is provided at the junction of the release chamber 1 and the absorption chamber 2. A slot 19 is provided on the side wall of the stirring shaft 16 corresponding to the air delivery chamber 20. The air delivery port 18 is connected to the air delivery chamber 20.

[0036] To increase the stability and accuracy of the lifting of the upright 13 and the first rack plate 14, a guide frame 21 corresponding to the first rack plate 14 and the upright 13 is provided in the release chamber 1. A linear guide rail is provided on the guide frame 21, and one side of the upright 13 and the first rack plate 14 is movably connected to the linear guide rail.

[0037] Working principle: During use, the floor to be tested is fixed in the release chamber 1. Multiple floorboards can be fixed together in the release chamber 1. Then, the chamber door of the release chamber 1 is closed, and an appropriate amount of absorbent liquid is added to the absorption chamber 2. Initially, the drive source 4 drives the traction frame 15 to move down. The traction frame 15 drives the upright rod 13 and the T-shaped traction pin 31 to move down as a whole. At this stage, due to the friction between the piston plate 12 and the inner wall of the pressure chamber 8, the piston plate 12 will not move down. When the upright rod 13 moves down, the gear teeth 32 on the lower side wall will mesh with the gear ring 25. Since the lower gear teeth 32 cannot rotate upwards initially, they can drive the turntable 23 to rotate. As a result, the first exhaust port 5 and the through hole 30 on the turntable 23 are gradually misaligned, thereby opening the through hole 30 at one end of the first exhaust port 5. The valve is gradually closed. When the gear tooth 32 at the lower end of the upright 13 separates from the traction frame 15, the through hole 30 at the end of the first exhaust port 5 is completely closed, and the convex shaft 27 on the turntable 23 will contact a stop block 26, thus being limited. At this time, the space formed by the release chamber 1 and the pressure chamber 8 is in a closed state. The floor releases formaldehyde in the release chamber 1 for a certain period of time. After that, the drive source 4 continues to drive the traction frame 15 to move down. At this time, the traction frame 15 can drive the piston plate 12 to move down together. During this stage, the traction frame 15, piston plate 12, upright 13 and first rack plate 14 move down together. The first rack plate 14 will mesh with the first gear 17, thereby driving the stirring shaft 16 to rotate. At the same time, the piston plate 12 compresses the gas in the pressure chamber 8 and the release chamber 1. The air pressure opens the one-way valve on the air inlet 18, then enters the air delivery chamber 20 through the air inlet 18, then enters the interior of the stirring shaft 16 through the slot 19, and then enters the absorbent liquid in the absorption chamber 2 through the nozzle on the stirring shaft 16. Following the rotation of the stirring shaft 16, the liquid is stirred, which can improve the absorption efficiency. After the small bubbles rise, they are discharged to the gas purification device through the second exhaust port 6. Furthermore, during this stage, the second rack plate 22 will mesh with the second gear 24 when it moves down with the upright rod 13. However, since the second gear 24 rotates only on the rotating shaft 28, the second gear 24 and the rotating shaft 28 rotate relative to each other and will not drive the rotating shaft 28 to rotate. The piston plate 12 stops when it descends to its limit distance. Before the upright rod 13 descends to its limit distance, the upper gear teeth 32 will... The shaft 27 contacts the gear ring 25, but due to the restriction of the stop block 26 on the cam shaft 27, and the fact that the upper gear tooth 32 can flip upward in the initial state, the upper gear tooth 32 of the upright 13 will not drive the turntable 23 to rotate through the gear ring 25. The gear tooth 32 will flip upward and twist the torsion spring 34. After descending to the limit distance, the drive source 4 drives the traction frame 15 to rise and reset, and the upright 13 rises accordingly. At this time, the upper gear tooth 32 of the upright 13 will drive the upright 13 to rotate through the gear ring 25, so that the through hole 30 at the end of the first exhaust port 5 and the through hole 30 on the turntable 23 gradually match. When the upper gear tooth 32 separates from the gear ring 25, the through hole 30 at the end of the first exhaust port 5 is fully opened. At this time, the cam shaft 27 is limited by another stop block 26.Subsequently, the traction frame 15 pulls the piston plate 12 upward via the T-shaped traction pin 31. The piston plate 12 begins to move upward. When the second rack plate 22 meshes with the second gear 24 again, it drives the rotating shaft 28 to rotate via the second gear 24. In turn, the rotating shaft 28 drives the fan blade 29 to rotate. At the same time, when the piston plate 12 rises, it generates negative pressure in the release chamber 1 and the pressure chamber 8. Under the action of negative pressure, the one-way valve on the second air inlet 35 is sucked open, and the clean gas above the piston plate 12 enters the pressure chamber 8 and the release chamber 1 through the second air inlet 35, thereby diluting the residual formaldehyde gas. With the fan blade 29 rotating and sucking outward, the diluted gas can enter the first exhaust port 5 through the through hole 30, and then enter the gas purification device through the first exhaust port 5. When the traction frame 15 is about to rise to the limit distance, the wheel tooth 32 at the lower end of the upright 13 contacts the gear ring 25. Due to the lower wheel... The gear 32 will flip downwards, and the stop block 26 will limit the convex shaft 27. At this time, the gear 32 at the lower end of the upright rod 13 will not drive the turntable 23 to rotate through the gear ring 25. In addition, since the first gear 17 and the stirring shaft 16 rotate in one direction, the first rack plate 14 will not drive the stirring shaft 16 to continue rotating through the first gear 17 when it rises during this stage. The first gear 17 will rotate relative to the stirring shaft 16. After the reset is completed, the absorbent liquid in the absorption chamber 2 can be discharged into the cuvette 7 in the detection chamber 3, and then colorimetric detection can be performed by the optical detection device 11. During the discharge and detection, the floor in the release chamber 1 can be removed, and a new base plate can be fixed for subsequent detection. After the detection, the residue in the absorption chamber 2 can be discharged from the bottom and rinsed appropriately for subsequent use. After the absorbent liquid in the cuvette 7 is detected, it can be removed and the cuvette 7 can be cleaned.

[0038] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A colorimetric detection device for formaldehyde emission during SPC flooring production, characterized in that, It includes a release chamber, an absorption chamber located on one side of the release chamber, and a detection chamber located on one side of the absorption chamber. The detection chamber contains a cuvette and an optical detection device located above the cuvette. One end of the absorption chamber is provided with a drain port corresponding to the cuvette, and a solenoid valve is installed on the drain port. A pressure chamber is provided above the release chamber. A piston plate is vertically and movably installed inside the pressure chamber. A first air inlet is provided at the upper end of the pressure chamber. An air supply port communicating with the absorption chamber is provided at the lower end of the pressure chamber, and a one-way valve is provided on the air supply port. A drive source for driving the piston plate to rise and fall is provided at the top of the pressure chamber. It also includes a residue removal mechanism, which includes a first exhaust port located on one side of the release chamber. A rotating shaft is rotatably installed in the first exhaust port, and a fan blade is mounted on the rotating shaft. A turntable is rotatably installed on one end of the first exhaust port located inside the release chamber. One end of the rotating shaft extends to the inside of the release chamber and is equipped with a second gear that rotates unidirectionally. Corresponding through holes are provided on the side wall of the turntable and the end of the first exhaust port. A gear ring is installed on the outer side of the turntable. A traction frame is provided above the piston plate. The output end of the drive source is connected to the traction frame. A T-shaped traction pin that movably engages with the piston plate is installed at the bottom of the traction frame. A second air inlet is provided on the piston plate, and a one-way valve is installed on the second air inlet. A drive assembly for driving the rotating shaft and the turntable to rotate is provided on the traction frame.

2. The formaldehyde emission colorimetric detection device for SPC flooring production according to claim 1, characterized in that: The drive assembly includes a vertical rod mounted on the traction frame and extending below the piston plate, with a second rack plate corresponding to and adapted to the second gear mounted on one side of the vertical rod; Both the upper and lower ends of the upright are provided with rotating grooves. The rotating grooves are provided with gear teeth that correspond to and are adapted to the gear ring. A torsion spring is installed between the end of the gear teeth and the inner wall of the rotating groove. In the initial state of the torsion spring, the gear teeth at the upper end of the upright can flip upward and the gear teeth at the lower end of the upright can flip downward.

3. The formaldehyde emission colorimetric detection device for SPC flooring production according to claim 2, characterized in that: One end edge of the turntable is provided with a convex shaft extending to the side of the first exhaust port, and the side of the first exhaust port is provided with a pair of stop blocks corresponding to the convex shaft.

4. The formaldehyde emission colorimetric detection device for SPC flooring production according to claim 1, characterized in that: A second exhaust port is provided at the upper end of the absorption chamber.

5. The formaldehyde emission colorimetric detection device for SPC flooring production according to claim 1, characterized in that: The drive source is a cylinder or an electric push rod, and the output shaft of the drive source is bolted to the traction frame.

6. The formaldehyde emission colorimetric detection device for SPC flooring production according to claim 1, characterized in that: A stirring shaft is rotatably arranged in the absorption chamber. One end of the stirring shaft extends to the inner side of the release chamber and is rotatably arranged with a first gear in one direction. A first rack plate corresponding to and adapted to the first gear is provided at one end of the bottom of the piston plate.

7. The formaldehyde emission colorimetric detection device for SPC flooring production according to claim 6, characterized in that: The stirring shaft has a hollow structure and nozzles are evenly arranged on it. A gas delivery chamber corresponding to the stirring shaft is provided at the junction of the release chamber and the absorption chamber. The side wall of the stirring shaft corresponding to the gas delivery chamber is provided with a slot. The gas delivery port is connected to the gas delivery chamber.

8. The formaldehyde emission colorimetric detection device for SPC flooring production according to claim 6, characterized in that: The release chamber is equipped with a guide frame corresponding to the first rack plate and the upright. A linear guide rail is provided on the guide frame, and one side of the upright and the first rack plate is movably connected to the linear guide rail.

9. The formaldehyde emission colorimetric detection device for SPC flooring production according to claim 4, characterized in that: The outer ends of the first and second exhaust ports are used to connect to an external gas purification device.

10. The formaldehyde emission colorimetric detection device for SPC flooring production according to any one of claims 1-9, characterized in that: The optical detection device is a colorimeter.

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