Multilayer board formaldehyde emission detection equipment

Abstract

The invention relates to the technical field of formaldehyde monitoring devices, in particular to a multilayer board formaldehyde emission detection device which comprises a main machine, an electrochemical formaldehyde detection probe, an accessory pipe, an exhaust pipe, a one-way valve, an air inlet pipe, a detection air pipe and a cleaning air pipe. The bottom end of the detection air pipe and the bottom end of the cleaning air pipe are fixedly communicated with an adapter pipe, the adapter pipe is movably sleeved with a top port of the accessory pipe, the upper surface of the air inlet pipe is fixedly communicated with an air storage bag right above the cleaning air pipe, and a piston assembly for alternately sealing the top end of the detection air pipe and the top end of the cleaning air pipe is arranged in the air inlet pipe. The electrochemical formaldehyde detection probe is compact in structure and convenient to install, the detection air pipe and the cleaning air pipe are alternately closed through the piston assembly, the electrochemical formaldehyde detection probe is rapidly transferred from a high-concentration formaldehyde environment to a low-concentration formaldehyde environment, it is ensured that the zero point and sensitivity of the electrochemical formaldehyde detection probe rapidly return to normal, and the detection efficiency is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of formaldehyde monitoring devices, and particularly to a detection device for the formaldehyde release amount of multi-layer boards. Background Art

[0002] Formaldehyde is a colorless but pungent gas that has an obvious irritating effect on human organs such as eyes and noses. The gas density of formaldehyde is greater than that of air. In a general enclosed environment, formaldehyde tends to deposit at a position about 1 meter above the ground.

[0003] The Chinese invention with the publication number CN114839325B discloses a detection device for the formaldehyde release amount of multi-layer boards. This invention obtains the atmosphere in the workshop through a rotatable air suction device and detects the formaldehyde content in the air in the workshop through a formaldehyde detector. However, the rotatable air suction device cannot store the atmosphere in the workshop, resulting in the inability to subject the stored atmosphere in the workshop to more rigorous tests in the laboratory. In addition, current formaldehyde detectors mainly include electrochemical formaldehyde sensors and photochemical formaldehyde sensors. For electrochemical formaldehyde sensors, a relatively high-concentration formaldehyde environment may cause partial passivation of the electrolyte or the electrode surface inside the sensor, making the response speed of the sensor slower in a low-concentration environment, and causing the sensor to possibly take longer to detect changes in low-concentration formaldehyde. Summary of the Invention

[0004] The purpose of the present invention is to provide a detection device for the formaldehyde release amount of multi-layer boards to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A detection device for the formaldehyde release amount of multi-layer boards, including a main body, an electrochemical formaldehyde detection probe fixedly arranged on the upper surface of the main body, an accessory pipe fixedly arranged on the upper surface of the main body and located on the outer periphery of the electrochemical formaldehyde detection probe, an exhaust pipe fixedly arranged at the bottom of the side wall of the accessory pipe, a one-way valve fixedly installed on the exhaust pipe, an air inlet pipe with an open left end fixedly arranged above the main body, a detection air pipe and a cleaning air pipe fixedly connected in sequence along the left-right direction on the lower surface of the air inlet pipe, pipeline blowers are fixedly arranged on both the detection air pipe and the cleaning air pipe, the bottom ends of the detection air pipe and the cleaning air pipe are fixedly connected to a rotary joint, the rotary joint is movably sleeved with the top port of the accessory pipe, an air storage bag for storing clean air is fixedly connected to the upper surface of the air inlet pipe and located directly above the cleaning air pipe, and a piston assembly for alternately closing the top end of the detection air pipe and the top end of the cleaning air pipe is arranged in the air inlet pipe.

[0006] Optionally, the piston assembly includes a piston member slidably sleeved on the inner wall of the intake pipe, an elastic airbag fixedly arranged between the right inner wall of the intake pipe and the right side wall of the piston member and storing a non-toxic and easily expandable gas, and an electric heating rod arranged in the elastic airbag.

[0007] Optionally, the elastic airbag is of a cylindrical structure, the right end of the elastic airbag is an open structure, the right port of the elastic airbag is fixedly connected to the right inner wall of the intake pipe, and the electric heating rod is fixedly connected to the right inner wall of the intake pipe.

[0008] Optionally, an antioxidant coating is coated on the outer surface of the electric heating rod, the non-toxic and easily expandable gas is a mixture of oxygen and nitrogen, and the volume ratio of oxygen to nitrogen is 4:1.

[0009] Optionally, an electric heating ring is fixedly arranged on the right inner wall of the intake pipe and outside the elastic airbag, a plurality of heat conducting rods are fixedly arranged on the left side wall of the electric heating ring, and the plurality of heat conducting rods are arranged at intervals in a ring shape with respect to the elastic airbag.

[0010] Optionally, the left end of the heat conducting rod is located on the left side of the cleaning air pipe, an annular groove for accommodating the left end of the heat conducting rod is formed in the right side wall of the piston member, a heat conducting ring is sleeved on the outer walls of the plurality of heat conducting rods, and a plurality of heat conducting rings are arranged at intervals in the left-right direction.

[0011] Optionally, the adapter pipe is of a T-shaped structure, a bracket is arranged outside the main body, the bracket is of an L-shaped structure, the vertical section of the bracket is fixedly connected to the adapter pipe, an elastic member is fixedly arranged on the upper surface of the horizontal section of the bracket, a sleeve is fixedly arranged on the upper surface of the elastic member, and the upper surface of the sleeve abuts against the lower surface of the main body.

[0012] Optionally, the accessory pipe is made of brown glass material, and volume scales are drawn on the outer surface of the accessory pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The structure of the present invention is compact and the installation is convenient. By alternately closing the detection air pipe and the cleaning air pipe with the piston assembly, the electrochemical formaldehyde detection probe can be quickly transferred from a high-concentration formaldehyde environment to a low-concentration formaldehyde environment, ensuring that its zero point and sensitivity quickly return to normal, and significantly improving the detection efficiency; 2. The present invention can evenly transfer heat to the cleaning air flowing out of the air storage bag through the heat conducting rod, ensuring that the humidity in the accessory pipe can be effectively reduced, thereby providing a relatively dry working environment for the electrochemical formaldehyde detection probe. Description of the Drawings

[0014] Figure 1 Structural schematic diagram of the present invention; Figure 2 Partial cross-sectional view of the main machine, electrochemical formaldehyde detection probe and accessory pipe in the present invention; Figure 3 Partial cross-sectional view of the detection air pipe and piston assembly in the present invention.

[0015] In the figure: 1. Main machine; 2. Electrochemical formaldehyde detection probe; 3. Accessory pipe; 4. Exhaust pipe; 5. Check valve; 6. Intake pipe; 7. Detection air pipe; 8. Cleaning air pipe; 9. Pipeline fan; 10. Adapter pipe; 11. Storage airbag; 12. Piston assembly; 13. Piston part; 14. Elastic airbag; 15. Electric heating rod; 16. Electric heating ring; 17. Heat conduction rod; 18. Heat conduction ring; 19. Annular groove; 20. Bracket; 21. Elastic member; 22. Sleeve. Specific implementation mode

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] Embodiment: Please refer to Figures 1 to 3 , the present invention provides a multi-layer board formaldehyde emission detection device, including a main machine 1, an electrochemical formaldehyde detection probe 2 fixedly arranged on the upper surface of the main machine 1, the output end of the electrochemical formaldehyde detection probe 2 is electrically connected to the input end of the main machine 1, and the output end of the main machine 1 is communicatively connected to the upper computer. An accessory pipe 3 is fixedly arranged on the upper surface of the main machine 1 and around the electrochemical formaldehyde detection probe 2, and an exhaust pipe 4 is fixedly arranged at the bottom of the side wall of the accessory pipe 3, and a check valve 5 is fixedly installed on the exhaust pipe 4.

[0018] There is an annular gap between the outer wall of the electrochemical formaldehyde detection probe 2 and the bottom inner wall of the accessory pipe 3, and the gas in the accessory pipe 3 enters the exhaust pipe 4 through the annular gap, and the check valve 5 only allows the gas to discharge from the exhaust pipe 4 to the outside of the exhaust pipe 4.

[0019] Above the main body 1, an intake pipe 6 with an open left end is fixedly provided. Along the left - right direction on the lower surface of the intake pipe 6, a detection air pipe 7 and a cleaning air pipe 8 are fixedly connected in sequence. Pipe fans 9 are fixedly provided on both the detection air pipe 7 and the cleaning air pipe 8. The two pipe fans 9 are respectively connected to the detection air pipe 7 and the cleaning air pipe 8 in a threaded connection manner. The bottom ends of the detection air pipe 7 and the cleaning air pipe 8 are fixedly connected to a transfer pipe 10. The transfer pipe 10 is movably sleeved on the top port of the accessory pipe 3. On the upper surface of the intake pipe 6 and directly above the cleaning air pipe 8, an air storage bag 11 for storing clean air is fixedly connected. A piston assembly 12 for alternately closing the top ends of the detection air pipe 7 and the cleaning air pipe 8 is provided in the intake pipe 6.

[0020] Based on the above - mentioned embodiment, in this embodiment, the piston assembly 12 includes a piston member 13 slidably sleeved on the inner wall of the intake pipe 6, an elastic air bag 14 fixedly arranged between the right - hand inner wall of the intake pipe 6 and the right - hand side wall of the piston member 13 and storing a non - toxic and easily expandable gas, and an electric heating rod 15 arranged in the elastic air bag 14. Among them, the elastic air bag 14 is of a cylindrical structure. The right end of the elastic air bag 14 is an open structure. The right - hand port of the elastic air bag 14 is fixedly connected to the right - hand inner wall of the intake pipe 6, and the electric heating rod 15 is fixedly connected to the right - hand inner wall of the intake pipe 6.

[0021] Based on the above - mentioned embodiment, in this embodiment, the non - toxic and easily expandable gas is a mixture of oxygen and nitrogen, and the volume ratio of oxygen to nitrogen is 4:1. The outer surface of the electric heating rod 15 is coated with an antioxidant coating to reduce the oxidation of the outer surface of the electric heating rod 15 by oxygen.

[0022] Based on the above - mentioned embodiment, in this embodiment, an electric heating ring 16 is fixedly provided on the right - hand inner wall of the intake pipe 6 and outside the elastic air bag 14. A plurality of heat - conducting rods 17 are fixedly provided on the left - hand side wall of the electric heating ring 16. The plurality of heat - conducting rods 17 are arranged at annular intervals with respect to the elastic air bag 14. When the electric heating ring 16 is activated, the heat generated by it will be quickly conducted to the heat - conducting rods 17 in close contact with it. As an efficient heat - conducting medium, the heat - conducting rods 17 can evenly transfer the heat to the clean air flowing out from the air storage bag 11. As the clean air absorbs heat and warms up, its state after temperature rise enables it to effectively heat the inside of the accessory pipe 3 when entering the accessory pipe 3. This heating process can significantly increase the temperature inside the accessory pipe 3, prompt the moisture in it to quickly vaporize, and be discharged smoothly to the external environment through the exhaust pipe 4. In this way, the humidity inside the accessory pipe 3 can be effectively reduced, thereby providing a relatively dry working environment for the electrochemical formaldehyde detection probe 2. This dry environment is crucial for the performance of the electrochemical formaldehyde detection probe 2, can significantly increase the working life of the probe, and ensure the accuracy of its detection results, thereby providing a strong guarantee for the accurate measurement of formaldehyde concentration.

[0023] Based on the above embodiments, in this embodiment, the left end of the heat conduction rod 17 is located on the left side of the cleaning air pipe 8. An annular groove 19 for accommodating the left end of the heat conduction rod 17 is formed on the right side wall of the piston member 13. A heat conduction ring 18 is sleeved on the outer walls of a plurality of heat conduction rods 17. There are a plurality of heat conduction rings 18, and the plurality of heat conduction rings 18 are arranged at intervals in the left-right direction. The heat conduction ring 18 increases the contact area for the heat conduction rod 17 to heat the clean air, and the heat conduction ring 18 and the heat conduction rod 17 form a cage-shaped structure to limit the expansion of the elastic airbag 14, which can ensure that there is still enough space in the air inlet pipe 6 for the clean air to flow into the cleaning air pipe 8 after the elastic airbag 14 expands.

[0024] The present invention is installed in a factory building for storing multilayer boards. During sampling, the piston member 13 blocks the cleaning air pipe 8, and the pipeline fan 9 located on the detection air pipe 7 is turned on. The pipeline fan 9 can suck the atmosphere in the factory building from the air inlet pipe 6 into the adapter pipe 10 and finally reach the accessory pipe 3, and is detected by the electrochemical formaldehyde detection probe 2. The main unit 1 can obtain the formaldehyde concentration value in the factory building. After sampling, the electric heating rod 15 is turned on. The electric heating rod 15 heats the non-toxic and easily expandable gas in the elastic airbag 14, causing the elastic airbag 14 to expand and push the piston member 13 until the piston member 13 no longer closes the cleaning air pipe 8 and completely closes the detection air pipe 7. At this time, the pipeline fan 9 located on the cleaning air pipe 8 is turned on. The pipeline fan 9 can suck the clean air in the air storage bag 11 into the accessory pipe 3 and replace the atmosphere in the accessory pipe 3. The clean air can quickly transfer the electrochemical formaldehyde detection probe 2 from a high-concentration formaldehyde environment to a low-concentration formaldehyde environment, ensuring that its zero point and sensitivity quickly return to normal.

[0025] Based on the above embodiments, in this embodiment, the adapter pipe 10 is of a T-shaped structure. A bracket 20 is provided outside the main unit 1. The bracket 20 is of an L-shaped structure. The vertical section of the bracket 20 is fixedly connected to the adapter pipe 10. An elastic member 21 is fixedly provided on the upper surface of the horizontal section of the bracket 20. The elastic member 21 is a cylindrical helical spring. The upper surface of the elastic member 21 is fixedly provided with a sleeve 22. The upper surface of the sleeve 22 abuts against the lower surface of the main unit 1. The present invention can make a part of the bottom outlet of the adapter pipe 10 fit into the accessory pipe 3 through the elastic force provided by the elastic member 21, and can simply and conveniently complete the fixation of the main unit 1.

[0026] Based on the above embodiments, in this embodiment, the accessory pipe 3 is made of brown glass material, which can reduce the influence of light on the gas in the accessory pipe 3. The accessory pipe 3 can be used as a temporary container for collecting the gas in the factory building. Volume scales are drawn on the outer surface of the accessory pipe 3 of the present invention. When it is necessary to collect the gas in the accessory pipe 3 into the laboratory, a gas absorber can be inserted into the accessory pipe 3 for extraction, and the volume scales can be used to mark the insertion depth of the gas absorber.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting formaldehyde emission of a multilayer board, comprising a main unit (1), and an electrochemical formaldehyde detection probe (2) fixedly mounted on the upper surface of the main unit (1), characterized in that: An accessory pipe (3) is fixedly provided on the upper surface of the main unit (1) and located on the periphery of the electrochemical formaldehyde detection probe (2); an exhaust pipe (4) is fixedly provided on the bottom of the side wall of the accessory pipe (3); a one-way valve (5) is fixedly installed on the exhaust pipe (4); an air intake pipe (6) with an opening at the left end is fixedly provided on the upper part of the main unit (1); a detection air pipe (7) and a cleaning air pipe (8) are fixedly connected in sequence along the left-right direction on the lower surface of the air intake pipe (6); and the detection air pipe (7) and the cleaning air pipe (8) are provided on the upper part of the detection air pipe (7) and the upper part of the cleaning air pipe (8). A duct fan (9) is fixedly provided on both sides; the bottom ends of the detection air pipe (7) and the bottom ends of the cleaning air pipe (8) are fixedly connected to a transfer pipe (10); the transfer pipe (10) is movably connected to the top port of the accessory pipe (3); the upper surface of the air inlet pipe (6) and located directly above the cleaning air pipe (8) is fixedly connected to an air storage bag (11) for storing clean air; a piston assembly (12) is provided in the air inlet pipe (6) for alternately sealing the top ends of the detection air pipe (7) and the top ends of the cleaning air pipe (8).

2. A multi-layer board formaldehyde emission detection device according to claim 1, characterized in that: The piston assembly (12) comprises a piston member (13) slidably sleeved with the inner wall of the intake pipe (6), an elastic airbag (14) fixedly arranged between the right inner wall of the intake pipe (6) and the right wall of the piston member (13) and storing non-toxic and easily expandable gas, and an electric heating rod (15) arranged in the elastic airbag (14).

3. A multi-layer board formaldehyde emission detection device according to claim 2, characterized in that: The elastic airbag (14) is a cylindrical structure, the right end of the elastic airbag (14) is an open structure, the right port of the elastic airbag (14) is fixedly connected to the right inner wall of the air intake pipe (6), and the electric heating rod (15) is fixedly connected to the right inner wall of the air intake pipe (6).

4. A multi-layer board formaldehyde emission detection device according to claim 2, characterized in that: The outer surface of the electric heating rod (15) is coated with an anti-oxidation coating, and the non-toxic and easily expandable gas is a mixture of oxygen and nitrogen, with a volume ratio of oxygen to nitrogen of 4:

1.

5. The formaldehyde emission detection device for multi-layer boards according to claim 2, characterized in that: An electric heating ring (16) is fixedly provided on the right inner wall of the air inlet pipe (6) and located outside the elastic airbag (14), and a plurality of heat-conducting rods (17) are fixedly provided on the left wall of the electric heating ring (16). The plurality of heat-conducting rods (17) are arranged in a ring-shaped manner with respect to the elastic airbag (14).

6. A multi-layer board formaldehyde emission detection device according to claim 5, characterized in that: The left end of the heat-conducting rod (17) is located on the left side of the clean air pipe (8), and the right side wall of the piston member (13) is provided with an annular groove (19) for accommodating the left end of the heat-conducting rod (17). The outer walls of a plurality of the heat-conducting rods (17) are commonly sleeved with a heat-conducting ring (18), and a plurality of the heat-conducting rings (18) are provided, and the plurality of heat-conducting rings (18) are spaced apart in the left-right direction.

7. The formaldehyde emission detection device for multi-layer boards according to claim 1, characterized in that: The adapter tube (10) is of a T-shaped structure. A bracket (20) is provided on the outside of the main unit (1). The bracket (20) is of an L-shaped structure. The vertical section of the bracket (20) is fixedly connected to the adapter tube (10). An elastic member (21) is fixedly provided on the upper surface of the horizontal section of the bracket (20). A sleeve (22) is fixedly provided on the upper surface of the elastic member (21). The upper surface of the sleeve (22) abuts against the lower surface of the main unit (1).

8. The formaldehyde emission detection device for multi-layer boards according to claim 1, characterized in that: The accessory tube (3) is made of brown glass, and a volume scale is drawn on the outer surface of the accessory tube (3).

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