A device for detecting formaldehyde emission of artificial board

Abstract

The present invention discloses a formaldehyde emission detection device for artificial board, which belongs to the technical field of formaldehyde emission detection for artificial board, and comprises a climate chamber body, a detection chamber with an opening on one side is provided in the climate chamber body, a sealing door is installed at the opening of the detection chamber, an air inlet chamber is provided on the bottom wall of the detection chamber, a mounting seat is provided on the upper wall of the air inlet chamber, a support plate is provided on the upper end of the mounting seat, a rotating plate clamping device is provided on the support plate for sliding and pulling, a driving mechanism for driving the rotating plate clamping device to rotate is provided on the support plate, an adaptive uniform air expansion mechanism is rotatably connected to the mounting seat, and the upper end of the air inlet chamber is connected to the adaptive uniform air expansion mechanism. The present invention provides a formaldehyde emission detection device for artificial board, in which the air inlet direction can be continuously adjusted and changed around the test piece to ensure the uniformity of the airflow, and at the same time the test piece is continuously rotated so that the test piece is in uniform contact with the airflow.

Description

Technical Field

[0001] The invention belongs to the technical field of formaldehyde emission detection of artificial boards, and specifically refers to a device for detecting formaldehyde emission of artificial boards. Background Art

[0002] Artificial boards are often used in interior decoration. Artificial boards will release a certain amount of formaldehyde during use, which affects people's health. Therefore, it is usually necessary to test the formaldehyde emission of artificial boards during the production process.

[0003] The formaldehyde emission detection climate chamber is suitable for the determination of formaldehyde emission of various artificial boards, composite wood floors and other indoor decorative materials, and the constant temperature and humidity balance treatment of wood or artificial boards. When testing, the current formaldehyde emission climate chamber places the test piece in a closed test box, waits for the formaldehyde release of the test piece, and then tests the internal mixed gas. During the test, the test piece is directly stacked inside the test box, which is not conducive to the rapid release of formaldehyde and affects the detection efficiency of formaldehyde emission of artificial boards; in addition, the air inlet position of the existing climate chamber is fixed, and the air flow distribution is uneven during the test, which can easily lead to uneven temperature or humidity in the test chamber, which can easily affect the accuracy of the test. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a formaldehyde emission detection device for artificial boards, in which the air inlet direction can be continuously adjusted and changed around the test piece to ensure the uniformity of the airflow. At the same time, the test piece also continuously rotates to make the test piece in uniform contact with the airflow.

[0005] The technical solution adopted by the present invention is as follows: a formaldehyde emission detection device for artificial board provided by the present invention comprises a climate chamber body, a clean constant temperature and humidity air supply system is arranged in the climate chamber body, a detection chamber with an opening on one side is arranged in the climate chamber body, a sealing door is installed at the opening of the detection chamber, an air inlet is arranged at the lower part of the inner wall of the detection chamber, the clean constant temperature and humidity air supply system is connected with the air inlet, an air inlet chamber is arranged on the bottom wall of the detection chamber, a mounting seat is arranged on the upper wall of the air inlet chamber, a support plate is arranged on the upper end of the mounting seat, a rotating board clamping device is slidingly provided on the support plate, a driving mechanism for driving the rotating board clamping device to rotate is arranged on the support plate, an adaptive uniform air expansion mechanism is rotatably connected to the mounting seat, the air inlet chamber is connected to the air inlet, the upper end of the air inlet chamber is connected to the adaptive uniform air expansion mechanism, and the detection A sampling port is provided on the side wall of the cavity, and the sampling port is connected to a sampling detection mechanism. An air duct is provided in the mounting seat, and the air duct is arranged along the axial direction of the mounting seat. The upper end of the air inlet cavity is connected with the air duct, and the side wall of the mounting seat is provided with ventilation ports distributed along a circumferential array. The adaptive uniform air expansion mechanism comprises a rotating sleeve, an air pipe and a vertical air expansion member. The rotating sleeve is coaxially rotatably sleeved on the outside of the mounting seat, and the ventilation port is arranged in the rotating sleeve, and the air duct is connected with the rotating sleeve through the ventilation port. The air pipe is connected and arranged on one side of the rotating sleeve, and the vertical air expansion member is arranged at an end of the air pipe away from the rotating sleeve. The vertical air expansion member is arranged between the support plate and the side wall of the detection cavity, and an air expansion cavity is provided in the vertical air expansion member, and the bottom end of the air expansion cavity is connected with the air pipe. The side wall of the air expansion cavity is provided with a vertical air expansion port, and one side of the rotating sleeve is provided with an air expansion rotation drive for driving the rotating sleeve to rotate.

[0006] The rotating plate clamping device is arranged in an equidistant array on the support plate, and comprises a first screw adjustment assembly, a pull-out bracket, a rotating swivel, a rotating gear ring and a V-shaped clamping plate arranged at the end of the first screw adjustment assembly. The pull-out bracket is arranged on the support plate, and a mounting hole is provided on the pull-out bracket. The rotating swivel is rotatably arranged in the mounting hole, and the rotating gear ring is coaxially fixed to the side wall of the rotating swivel. The first screw adjustment assembly is installed on the inner wall of the rotating swivel along the radial direction of the rotating swivel. The first screw adjustment assembly is symmetrically arranged. A V-shaped clamp is provided at the end of each first screw adjustment assembly, and the V-shaped clamp is set to slide radially along the rotating ring. The first screw adjustment assembly can be used to adjust the spacing between the V-shaped clamps to facilitate clamping of the plate specimen. The rotating gear ring is arranged above the driving mechanism and is connected to the driving mechanism for transmission. The symmetrically arranged V-shaped clamps can clamp and fix the two diagonals of the specimen. The driving mechanism drives the rotating ring and the specimen clamped by the V-shaped clamp to rotate through the rotating gear ring, so that the specimen is in uniform contact with the airflow. The angle of the V-shaped clamp is 90°.

[0007] Furthermore, the length of the air pipe is greater than the length from the side wall of the support plate to the axis of the mounting seat, the air pipe includes a fixed air pipe and a sliding air pipe, the fixed air pipe is fixedly connected to one side of the rotating sleeve, the sliding air pipe is slidingly and sealingly connected to the fixed air pipe, a push spring is provided between the fixed air pipe and the vertical air expansion piece, the push spring pushes the side wall of the vertical air expansion piece to always maintain a state of being in contact with the side wall of the detection cavity, the vertical air expansion piece is provided at the end of the fixed air pipe away from the sliding air pipe, and the sliding air pipe is connected to the air expansion cavity.

[0008] The pull-out bracket includes a pull-out slide rail and a mounting bracket, the pull-out slide rail is arranged on the upper wall of the support plate, the mounting bracket is slidably mounted on the support plate through the pull-out slide rail, the mounting hole is penetrated through the side wall of the mounting bracket, the mounting bracket is provided with a gripping portion on the side close to the sealing door, the gripping portion is convenient for grasping the mounting bracket, and the pull-out slide rail is convenient for pulling out the rotating plate clamping device to facilitate loading and unloading; side limit mechanisms are symmetrically arranged on both sides of the rotating plate clamping device, the side limit mechanism includes a swing shaft, a swing rod and a limit plate arranged at the end of the swing rod, the swing shaft rotates through the mounting bracket, one end of the swing rod is rotatably connected to the swing shaft, the swing rod is rotatably arranged on one side of the mounting bracket through the swing shaft, and the swing rod is away from the swing rod A screw hole is provided at the end of the shaft, and a limit screw is provided on the side wall of the limit plate, which is threadedly connected to the screw hole; a ball is provided on the side of the limit plate close to the rotary plate clamping device; a socket is penetrated through the rocker arm; a positioning through hole is provided on the side wall of the mounting bracket; a positioning through hole is provided on the positioning through hole and the socket, and a positioning rod is passed through the positioning through hole and the socket; the limit plate and the rotating ring are eccentrically arranged, and the rocker arm can be fixed and limited by inserting the positioning through hole and the socket into the positioning through hole and the socket; the limit plate can be driven to approach the side wall of the specimen and clamp the side wall of the specimen by screwing the limit screw; the ball facilitates the rotation of the specimen relative to the limit plate; the eccentrically arranged limit plate can continuously change the clamping position during the rotation of the specimen to avoid obstruction.

[0009] Furthermore, a touch display panel is provided on the outer wall of the climate chamber body, a sensor detection module is provided in the detection cavity, an air outlet is provided on the side wall of the detection cavity, the air inlet and the air outlet are respectively connected to a gas mass flow controller, and a clean constant temperature and humidity air supply system is connected to the air inlet through the gas mass flow controller.

[0010] Furthermore, the sampling and detection mechanism includes a sampling pipeline, a sampling pump, a formaldehyde meter and a two-stage series absorption bottle. The sampling pipeline is connected to the sampling port, the sampling pump is arranged on the sampling pipeline, the end of the sampling pipeline away from the sampling port is connected to a three-way pipe, the other two ports of the three-way pipe are respectively connected to detection tube one and detection tube two, control valves are respectively provided on detection tube one and detection tube two, the formaldehyde meter is installed on the side wall of the climate chamber body, the formaldehyde meter is connected to detection tube one, the side wall of the climate chamber body is provided with a mounting frame, the two-stage series absorption bottle is arranged on the mounting frame, one end of the two-stage series absorption bottle is provided with an input pipe, the input pipe is threadedly connected to detection tube two, and the two-stage series absorption bottle is composed of two absorption bottles connected in series through pipelines.

[0011] Among them, the first screw adjustment assembly includes two groups of telescopic screw assemblies symmetrically arranged, and the two groups of telescopic screw assemblies are parallel. The telescopic screw assembly includes an adjusting screw and a threaded sleeve. The threaded sleeve is rotatably arranged on the inner wall of the rotating ring, and the adjusting screw is inserted in the threaded sleeve and threadedly connected with the threaded sleeve. By rotating the threaded sleeve, the adjusting screw can be driven to slide and retract along the threaded sleeve, thereby adjusting the position of the V-shaped clamp.

[0012] Furthermore, the inner wall of the rotating ring is provided with two groups of second screw adjustment assemblies installed radially and symmetrically, the second screw adjustment assembly has the same structure as the first screw adjustment assembly, the second screw adjustment assembly and the first screw adjustment assembly are perpendicular to each other, and a limiting arc plate is installed at the end of the second screw adjustment assembly.

[0013] Preferably, the rotating ring is equipped with an adjusting drive for driving the two groups of first screw adjustment assemblies and the two groups of second screw adjustment assemblies to extend and retract synchronously, the adjusting drive comprising an adjusting ring, a crown gear, an adjusting driven gear, a concentric gear and an adjusting drive gear, the adjusting ring is rotatably arranged on the side wall of the rotating ring, the crown gear is coaxially fixedly arranged on the side wall of the adjusting ring, the end face of the crown gear is provided with gear teeth, the adjusting driven gear is rotatably arranged on the inner side wall of the rotating ring, and four groups of adjusting driven gears are distributed in a circumferential array on the inner wall of the rotating ring, wherein two groups of adjusting driven gears are respectively rotatably arranged in the two groups of first screw adjustment assemblies, and the other two groups of adjusting driven gears are respectively rotatably arranged in the two groups of second screw adjustment assemblies, and an adjusting driven gear is respectively rotatably arranged between two parallel and adjacent threaded sleeves, the crown gear is meshed with the adjusting driven gear, the concentric gear is coaxially fixedly connected with the adjusting driven gear, the adjusting drive gear is coaxially fixedly arranged on the outside of the threaded sleeve, and the concentric gear is meshed with the adjusting drive gear.

[0014] By rotating the adjusting ring, the adjusting ring drives the crown gear to rotate, the crown gear drives multiple sets of adjusting driven gears to rotate synchronously, the adjusting driven gears drive the concentric gears to rotate synchronously, the concentric gears drive the threaded sleeves on both sides to rotate synchronously through the adjusting drive gears, and the rotation of the threaded sleeve drives the adjusting screw to move and retract along the threaded sleeve, thereby synchronously adjusting the positions of the V-shaped clamping plate and the limit arc plate.

[0015] Preferably, a tightening assembly is provided on the adjusting swivel, and the tightening assembly includes a tightening sleeve, a tightening screw and a tightening plate arranged at the end of the tightening screw. The tightening sleeve is fixedly penetrated through the side wall of the adjusting swivel, the tightening screw is penetrated through the tightening sleeve and is threadedly connected with the tightening sleeve, and the tightening plate is arranged at one end of the tightening screw close to the rotating swivel. The adjusting swivel can be fixed to the side wall of the rotating swivel by rotating the tightening screw to drive the tightening plate and the rotating swivel to tighten.

[0016] Preferably, the spacing length between two adjacent groups of rotating plate clamping devices is greater than or equal to 200 mm.

[0017] Preferably, the end of the positioning rod is threadedly connected with a threaded end cap, and the threaded end cap can prevent the positioning rod from falling off.

[0018] Preferably, the inner wall of the V-shaped clamping plate and the inner wall of the limiting arc plate are respectively provided with a flexible cushion layer, and the flexible cushion layer can be any one of a silicone layer and a rubber layer.

[0019] Among them, the driving mechanism includes a rotating shaft and a rotating driving gear, the support plate is symmetrically provided with fixed brackets, the rotating shaft is rotatably arranged between the fixed brackets, the rotating driving gear is coaxially fixedly arranged on the rotating shaft, and the rotating driving gear is distributed in an axial array along the rotating shaft. A rotating motor for driving the rotating shaft to rotate is provided on the support plate, and a rotating gear ring is rotatably arranged above the rotating driving gear, and the rotating gear ring is meshed with the rotating driving gear.

[0020] Among them, the air expansion rotation drive includes an air expansion motor, an air expansion gear and an air expansion gear ring, the air expansion gear ring is coaxially fixed to the bottom end of the rotating sleeve, the air expansion gear is rotatably arranged on the upper wall of the air inlet chamber, the air expansion gear is meshed with the air expansion gear ring, the air expansion motor is arranged in the air inlet chamber, and a transmission shaft is arranged between the output end of the air expansion motor and the air expansion gear, the transmission shaft rotates and penetrates the upper wall of the air inlet chamber, the air expansion motor drives the air expansion gear to rotate, the air expansion gear drives the rotating sleeve to rotate through the air expansion gear ring, and the rotating sleeve drives the air pipe and the vertical air expansion piece at the end of the air pipe to rotate around the mounting seat.

[0021] Preferably, a driving bevel gear is provided at the output end of the rotating motor, a driven bevel gear is coaxially fixedly provided on the rotating shaft, the driving bevel gear meshes with the driven bevel gear, the rotating motor drives the driving bevel gear to rotate, and the driving bevel gear drives the driven bevel gear and the rotating shaft to rotate.

[0022] Preferably, a side of the vertical air diffuser away from the sliding air duct is arranged as a curved surface.

[0023] Preferably, wind guide plates are installed in the array inside the vertical air diffusers.

[0024] Preferably, a sealing ring is provided between the rotating sleeve and the mounting seat.

[0025] The beneficial effects achieved by the present invention using the above structure are as follows:

[0026] 1. The four corners of the specimen can be quickly fixed and clamped by two sets of V-shaped clamping plates and two sets of limiting arc plates. The specimen can be quickly fixed and clamped in the rotating plate clamping device by cooperating with the side limiting mechanism. The limiting arc plate is in line contact with the specimen, which can avoid affecting the release of formaldehyde from the plate and ensure the accuracy of the formaldehyde emission test results.

[0027] 2. The driving mechanism and the rotating gear ring drive the rotating ring and the test piece clamped by the V-shaped clamp to rotate, so that the test piece is in uniform contact with the airflow, which is convenient for rapid evaluation of formaldehyde release performance.

[0028] 3. The crown gear drives multiple sets of adjustment driven gears to rotate synchronously. The adjustment driven gear drives the threaded sleeve to rotate through the concentric gear and the adjustment driving gear. Multiple sets of telescopic screw assemblies are telescoped synchronously to adjust the distance from the V-shaped clamp to the specimen, which is convenient for clamping the specimen.

[0029] 4. The air expansion rotary drive drives the slidingly connected fixed air pipe and the sliding air pipe to rotate around the mounting seat. The push spring makes the vertical air expansion piece always keep in contact with the inner wall of the detection chamber. The vertical air expansion piece rotates in a circle around multiple sets of rotating plate clamping devices. The air inlet direction is constantly adjusted and changed around the test piece, so that the temperature or humidity in the detection chamber is uniform.

[0030] 5. The rotating vertical air diffuser, in conjunction with the rotating plate clamping device, drives the test piece to rotate continuously, thereby evenly diffusing the airflow to each position of each test piece, ensuring the rapid formation of a constant temperature and humidity environment, and facilitating the improvement of the detection efficiency of formaldehyde release from artificial boards.

[0031] 6. Two measurement methods are provided: instant formaldehyde analyzer and acetylacetone spectrophotometry, which is convenient for users to choose freely. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a device for detecting formaldehyde emission of artificial board provided by the present invention;

[0033] Figure 2 A schematic structural diagram of a device for detecting formaldehyde emission of artificial board provided by the present invention from another perspective;

[0034] Figure 3 A front view of the climate box body provided by the present invention;

[0035] Figure 4 A schematic diagram of the structure of the climate box body provided by the present invention;

[0036] Figure 5 A cross-sectional view of the climate box body provided by the present invention;

[0037] Figure 6 for Figure 2 A partial enlarged view of part A;

[0038] Figure 7 A schematic diagram of the combined structure of the support plate, the rotating plate clamping device and the side limit mechanism provided by the present invention;

[0039] Figure 8 A schematic diagram of the combined structure of the support plate, the rotating plate clamping device and the side limit mechanism provided by the present invention from another perspective;

[0040] Fig. 9 A side view of the rotary plate clamping device and the side limit mechanism provided by the present invention;

[0041] Fig.10 A schematic diagram of the structure of the rotary plate clamping device and the side limit mechanism provided by the present invention;

[0042] Fig.11 A schematic diagram of the structure of the pull-out bracket and the side limit mechanism provided by the present invention;

[0043] Fig.12 An exploded view of the rotating ring, rotating gear, V-shaped clamping plate, first screw adjustment assembly, abutment assembly and adjustment drive provided by the present invention;

[0044] Fig.13 A schematic diagram of the combined structure of the support plate and the driving mechanism provided by the present invention;

[0045] Fig.14 A schematic diagram of the combined structure of the support plate, the mounting seat and the adaptive uniform air diffusion mechanism provided by the present invention;

[0046] Fig.15 A schematic diagram of the combined structure of the rotating sleeve, the air pipe and the vertical air diffuser provided by the present invention;

[0047] Fig.16 A perspective view of a two-stage series absorption bottle provided by the present invention;

[0048] Fig.17 This is a structural block diagram of the clean constant temperature and humidity air supply system provided by the present invention.

[0049] Among them, 1. climate chamber body, 2. detection chamber, 3. sealing door, 4. sampling detection mechanism, 5. mounting seat, 6. support plate, 7. rotating plate clamping device, 8. driving mechanism, 9. adaptive uniform air expansion mechanism, 10. air outlet, 11. sampling port, 12. sampling pipeline, 13. first screw adjustment component, 14. pull-out bracket, 15. rotating swivel, 16. rotating gear ring, 17. V-shaped clamp, 18. mounting hole, 19. side limit mechanism, 20. swing shaft, 21. swing rod, 22, limit plate, 23, screw hole, 24, limit screw, 25, ball, 26, jack, 27, positioning hole, 28, positioning rod, 29, threaded end cap, 30, flexible cushion, 31, adjustment drive, 32, adjustment swivel, 33, crown gear, 34, adjustment driven gear, 35, concentric gear, 36, adjustment drive gear, 37, tightening assembly, 38, tightening screw sleeve, 39, tightening screw, 40, tightening plate, 41, pull-out slide rail, 42, mounting bracket, 43, grip holding part, 44, rotating shaft, 45, rotating drive gear, 46, fixed bracket, 47, rotating motor, 48, active bevel gear, 49, driven bevel gear, 50, airway, 51, vent, 52, rotating sleeve, 53, air pipe, 54, vertical air expansion member, 55, vertical air expansion port, 56, air expansion rotation drive, 57, air inlet chamber, 58, air inlet, 59, gas mass flow controller, 60, fixed air pipe, 61, sliding air pipe, 62, push spring, 63, air guide plate, 64, seal Sealing ring, 65. Air expansion motor, 66. Air expansion gear, 67. Air expansion gear ring, 68. Transmission shaft, 69. Protective cover, 70. Adjusting screw, 71. Threaded sleeve, 72. Touch display panel, 73. Sensor detection module, 74. Sampling pump, 75. Formaldehyde analyzer, 76. Two-stage series absorption bottle, 77. Three-way pipe, 78. Detection tube one, 79. Detection tube two, 80. Mounting bracket, 81. Second screw adjustment assembly, 82. Limiting arc plate, 83. Control valve, 84. Input pipe.

[0050] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0052] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0053] like Figure 1-Figure 17 As shown, a formaldehyde emission detection device for artificial board provided by the present invention comprises a climate box body 1, in which a clean constant temperature and humidity air supply system is arranged, a detection chamber 2 with an opening on one side is arranged in the climate box body 1, a sealing door 3 is installed at the opening of the detection chamber 2, an air inlet 58 is arranged at the lower part of the inner wall of the detection chamber 2, the clean constant temperature and humidity air supply system is connected with the air inlet 58, an air inlet chamber 57 is arranged at the bottom wall of the detection chamber 2, a mounting seat 5 is arranged on the upper wall of the air inlet chamber 57, a support plate 6 is arranged at the upper end of the mounting seat 5, a rotating plate clamping device 7 is arranged on the support plate 6 for sliding and pulling, The support plate 6 is provided with a driving mechanism 8 for driving the rotating plate clamping device 7 to rotate, the mounting seat 5 is rotatably connected with an adaptive uniform air expansion mechanism 9, the air inlet chamber 57 is connected to the air inlet 58, the upper end of the air inlet chamber 57 is connected to the adaptive uniform air expansion mechanism 9, the side wall of the detection chamber 2 is provided with an air outlet 10, the side wall of the detection chamber 2 is provided with a sampling port 11, the sampling port 11 is connected to the sampling detection mechanism 4, the air inlet 58 and the air outlet 10 are respectively connected to a gas mass flow controller 59, and the clean constant temperature and humidity air supply system is connected to the air inlet 58 through the gas mass flow controller 59.

[0054] A touch display panel 72 is disposed on the outer side wall of the climate box body 1 , and a sensor detection module 73 is disposed in the detection cavity 2 .

[0055] As a prior art, in this embodiment, the clean constant temperature and humidity air supply system includes an air pressure control device, a gas filtering device, a temperature regulating device and a humidity regulating device. The gas filtering device is provided with a particle filter, a gas oxidation reaction filter and an activated carbon filter. The air pressure control device is provided with a fan, the humidity regulating device is provided with a humidity adjustment generator, and the temperature regulating device is provided with a refrigeration system and an electric heater. The clean constant temperature and humidity air supply system can filter the air, adjust the temperature and humidity, generate clean air with a certain temperature and humidity, and then send it into the detection chamber 2 through the gas mass flow controller 59 through the air inlet 58; the sensor detection module 73 includes a temperature sensor, a humidity sensor, a wind speed sensor, and an air pressure sensor.

[0056] The sampling and detection mechanism 4 includes a sampling pipeline 12, a sampling pump 74, a formaldehyde analyzer 75 and a two-stage series absorption bottle 76. The sampling pipeline 12 is connected to the sampling port 11. The sampling pump 74 is arranged on the sampling pipeline 12. One end of the sampling pipeline 12 away from the sampling port 11 is connected to a three-way pipe 77. The other two ports of the three-way pipe 77 are respectively connected to a detection tube 1 78 and a detection tube 2 79. The detection tube 1 78 and the detection tube 2 79 are respectively provided with a control valve 83. The formaldehyde analyzer 75 is installed on the side wall of the climate chamber body 1. The formaldehyde analyzer 75 is connected to the detection tube 1 78. The side wall of the climate chamber body 1 is provided with a mounting frame 80. The two-stage series absorption bottle 76 is arranged on the mounting frame 80. One end of the two-stage series absorption bottle 76 is provided with an input pipe 84. The input pipe 84 is threadedly connected to the detection tube 2 79. The two-stage series absorption bottle 76 is composed of two absorption bottles connected in series through pipelines.

[0057] The rotating plate clamping devices 7 are arranged in an equidistant array on the support plate 6 , and the spacing between two adjacent groups of rotating plate clamping devices 7 is greater than or equal to 200 mm.

[0058] The rotary plate clamping device 7 includes a first screw adjustment component 13, a pull-out bracket 14, a rotating swivel 15, a rotating gear ring 16 and a V-shaped clamping plate 17 arranged at the end of the first screw adjustment component 13. The pull-out bracket 14 is arranged on the support plate 6. The pull-out bracket 14 is provided with a mounting hole 18. The rotating swivel 15 is rotatably arranged in the mounting hole 18. The rotating gear ring 16 is coaxially fixed to the side wall of the rotating swivel 15. The first screw adjustment component 13 is installed on the inner wall of the rotating swivel 15 along the radial direction of the rotating swivel 15. The first screw adjustment component 13 is symmetrically arranged, and each first screw adjustment component A V-shaped clamping plate 17 is respectively provided at the end of the component 13, and the V-shaped clamping plate 17 is set to slide radially along the rotating ring 15. The first screw adjustment component 13 is used to adjust the spacing between the V-shaped clamping plates 17 to facilitate clamping of the plate specimen. The rotating gear ring 16 is arranged above the driving mechanism 8 and is connected to the driving mechanism 8 in transmission. The symmetrically arranged V-shaped clamping plates 17 can clamp and fix the two diagonal corners of the specimen. The driving mechanism 8 drives the rotating ring 15 and the specimen clamped by the V-shaped clamping plate 17 to rotate through the rotating gear ring 16, so that the specimen is in uniform contact with the airflow; the angle of the V-shaped clamping plate 17 is 90°.

[0059] The pull-out bracket 14 includes a pull-out slide rail 41 and a mounting bracket 42. The pull-out slide rail 41 is arranged on the upper wall of the support plate 6. The mounting bracket 42 is slidably mounted on the support plate 6 through the pull-out slide rail 41. The mounting hole 18 is penetrated through the side wall of the mounting bracket 42. The mounting bracket 42 is provided with a gripping portion 43 on the side close to the sealing door 3. The gripping portion 43 facilitates grasping the mounting bracket 42. The pull-out slide rail 41 facilitates pulling out the rotating plate clamping device 7 to facilitate loading and unloading.

[0060] The rotatable plate clamping device 7 is symmetrically provided with side limiting mechanisms 19 on both sides, and the side limiting mechanisms 19 include a swing shaft 20, a swing rod 21, and a limiting plate 22 arranged at the end of the swing rod 21. The swing shaft 20 rotates and penetrates the mounting bracket 42, and one end of the swing rod 21 is rotatably connected to the swing shaft 20. The swing rod 21 is rotatably arranged on one side of the mounting bracket 42 through the swing shaft 20. A screw hole 23 is provided at the end of the swing rod 21 away from the swing shaft 20, and a limiting screw 24 is provided on the side wall of the limiting plate 22. The limiting screw 24 is threadedly connected to the screw hole 23. A ball 25 is provided on the side of the limiting plate 22 close to the rotatable plate clamping device 7. A plug hole 26 is penetrated on the swing rod 21. The mounting bracket A positioning through hole 27 is provided on the side wall of the frame 42, and a positioning rod 28 is inserted in the positioning through hole 27 and the insertion hole 26. The limit plate 22 and the rotating ring 15 are eccentrically arranged. The positioning rod 28 is inserted in the positioning through hole 27 and the insertion hole 26, so that the rocker arm 21 can be fixed and limited. By screwing the limiting screw 24, the limit plate 22 can be driven close to the side wall of the specimen and clamp the side wall of the specimen. The ball 25 facilitates the rotation of the specimen relative to the limit plate 22. The eccentrically arranged limit plate 22 can continuously change the clamping position during the rotation of the specimen to avoid obstruction; the end of the positioning rod 28 is threadedly connected with a threaded end cap 29, and the threaded end cap 29 can prevent the positioning rod 28 from falling off.

[0061] The driving mechanism 8 includes a rotating shaft 44 and a rotating driving gear 45. The support plate 6 is symmetrically provided with fixed brackets 46. The rotating shaft 44 is rotatably arranged between the fixed brackets 46. The rotating driving gear 45 is coaxially fixedly arranged on the rotating shaft 44. The rotating driving gear 45 is distributed in an axial array along the rotating shaft 44. A rotating motor 47 for driving the rotating shaft 44 to rotate is provided on the support plate 6. The rotating gear ring 16 is rotatably arranged above the rotating driving gear 45, and the rotating gear ring 16 is meshed with the rotating driving gear 45.

[0062] The output end of the rotating motor 47 is provided with a driving bevel gear 48, and the rotating shaft 44 is coaxially fixed with a driven bevel gear 49. The driving bevel gear 48 meshes with the driven bevel gear 49. The rotating motor 47 drives the driving bevel gear 48 to rotate, and the driving bevel gear 48 drives the driven bevel gear 49 and the rotating shaft 44 to rotate.

[0063] The first screw adjustment assembly 13 includes two groups of telescopic screw assemblies symmetrically arranged, and the two groups of telescopic screw assemblies are parallel. The telescopic screw assembly includes an adjusting screw 70 and a threaded sleeve 71. The threaded sleeve 71 is rotatably arranged on the inner wall of the rotating ring 15. The adjusting screw 70 is inserted into the threaded sleeve 71 and is threadedly connected with the threaded sleeve 71. By rotating the threaded sleeve 71, the adjusting screw 70 can be driven to slide and retract along the threaded sleeve 71, thereby adjusting the position of the V-shaped clamp 17.

[0064] The inner wall of the rotating ring 15 is provided with two groups of second screw adjustment assemblies 81 installed radially and symmetrically. The second screw adjustment assembly 81 has the same structure as the first screw adjustment assembly 13. The second screw adjustment assembly 81 and the first screw adjustment assembly 13 are perpendicular to each other. A limiting arc plate 82 is installed at the end of the second screw adjustment assembly 81.

[0065] In some embodiments, the inner wall of the V-shaped clamping plate 17 and the inner wall of the limiting arc plate 82 are respectively provided with a flexible cushion layer 30, and the flexible cushion layer 30 can be any one of a silicone layer and a rubber layer.

[0066] The rotating ring 15 is provided with an adjusting drive 31 for driving the two groups of first screw adjustment assemblies 13 and the two groups of second screw adjustment assemblies 81 to extend and retract synchronously. The adjusting drive 31 includes an adjusting ring 32, a crown gear 33, an adjusting driven gear 34, a concentric gear 35 and an adjusting driving gear 36. The adjusting ring 32 is rotatably arranged on the side wall of the rotating ring 15, the crown gear 33 is coaxially fixedly arranged on the side wall of the adjusting ring 32, the end face of the crown gear 33 is provided with gear teeth, the adjusting driven gear 34 is rotatably arranged on the inner wall of the rotating ring 15, and the inner wall of the rotating ring 15 is arranged along the circumferential array. Four groups of adjusting driven gears 34 are arranged in a row, two of which are respectively rotatably arranged in two groups of first screw adjusting assemblies 13, and the other two groups of adjusting driven gears 34 are respectively rotatably arranged in two groups of second screw adjusting assemblies 81. An adjusting driven gear 34 is respectively rotated between every two parallel and adjacent threaded sleeves 71, the crown gear 33 is meshed with the adjusting driven gear 34, the concentric gear 35 is coaxially fixedly connected with the adjusting driven gear 34, and the adjusting drive gear 36 is coaxially fixedly connected to the outside of the threaded sleeve 71, and the concentric gear 35 is meshed with the adjusting drive gear 36.

[0067] By rotating the adjusting ring 32, the adjusting ring 32 drives the crown gear 33 to rotate, the crown gear 33 drives multiple sets of adjusting driven gears 34 to rotate synchronously, the adjusting driven gears 34 drive the concentric gears 35 to rotate synchronously, the concentric gears 35 drive the threaded sleeves 71 on both sides to rotate synchronously through the adjusting drive gear 36, and the adjusting screw 70 is driven to move and retract along the threaded sleeve 71 through the rotation of the threaded sleeve 71, so as to synchronously adjust the positions of the V-shaped clamping plate 17 and the limiting arc plate 82; a protective cover 69 is provided on the outer side cover of the adjusting drive 31.

[0068] The adjusting swivel 32 is provided with a clamping assembly 37, and the clamping assembly 37 includes a clamping screw sleeve 38, a clamping screw rod 39 and a clamping plate 40 arranged at the end of the clamping screw rod 39. The clamping screw sleeve 38 is fixedly passed through the side wall of the adjusting swivel 32, the clamping screw rod 39 is passed through the clamping screw sleeve 38 and is threadedly connected with the clamping screw sleeve 38, and the clamping plate 40 is arranged at one end of the clamping screw rod 39 close to the rotating swivel 15. The adjusting swivel 32 can be fixed to the side wall of the rotating swivel 15 by rotating the clamping screw rod 39 to drive the clamping plate 40 to clamp against the rotating swivel 15.

[0069] An air duct 50 is provided in the mounting seat 5, and the air duct 50 is arranged along the axial direction of the mounting seat 5. The side wall of the mounting seat 5 is provided with vents 51 distributed in a circumferential array. The adaptive uniform air expansion mechanism 9 includes a rotating sleeve 52, an air pipe 53 and a vertical air expansion member 54. The rotating sleeve 52 is coaxially rotatably sleeved on the outside of the mounting seat 5. The vent 51 is arranged in the rotating sleeve 52. The air duct 50 is connected to the rotating sleeve 52 through the vent 51. The air pipe 53 is connected to the rotating sleeve 52. On one side of the sleeve 52, the vertical air expansion member 54 is arranged at one end of the air pipe 53 away from the rotating sleeve 52, the length of the air pipe 53 is greater than the length from the side wall of the support plate 6 to the axis of the mounting seat 5, the vertical air expansion member 54 is arranged between the support plate 6 and the side wall of the detection chamber 2, an air expansion cavity is arranged in the vertical air expansion member 54, the bottom end of the air expansion cavity is connected to the air pipe 53, the side wall of the air expansion cavity is provided with a vertical air expansion port 55, and one side of the rotating sleeve 52 is provided with an air expansion rotation drive 56 for driving the rotating sleeve 52 to rotate.

[0070] The air expansion rotary drive 56 includes an air expansion motor 65, an air expansion gear 66 and an air expansion gear ring 67. The air expansion gear ring 67 is coaxially fixed to the bottom end of the rotating sleeve 52. The air expansion gear 66 is rotatably arranged on the upper wall of the air inlet chamber 57. The air expansion gear 66 is meshed with the air expansion gear ring 67. The air expansion motor 65 is arranged in the air inlet chamber 57. A transmission shaft 68 is arranged between the output end of the air expansion motor 65 and the air expansion gear 66. The transmission shaft 68 rotates and penetrates the upper wall of the air inlet chamber 57. The air expansion motor 65 drives the air expansion gear 66 to rotate. The air expansion gear 66 drives the rotating sleeve 52 to rotate through the air expansion gear ring 67. The rotating sleeve 52 drives the air pipe 53 and the vertical air expansion member 54 at the end of the air pipe 53 to rotate around the mounting seat 5.

[0071] The air pipe 53 includes a fixed air pipe 60 and a sliding air pipe 61. The fixed air pipe 60 is fixedly connected to one side of the rotating sleeve 52. The sliding air pipe 61 is slidingly and sealingly connected to the fixed air pipe 60. A push spring 62 is provided between the fixed air pipe 60 and the vertical air expansion piece 54. The push spring 62 pushes the side wall of the vertical air expansion piece 54 to always maintain a state of being in contact with the side wall of the detection chamber 2. The vertical air expansion piece 54 is provided at the end of the fixed air pipe 60 away from the sliding air pipe 61, and the sliding air pipe 61 is connected to the air expansion chamber.

[0072] In some embodiments, a side of the vertical air diffuser 54 away from the sliding air duct 61 is configured as a curved surface.

[0073] In order to better guide the air, in some embodiments, an array of air guide plates 63 are installed in the vertical air diffusers 55 .

[0074] In order to improve the air tightness between the rotating sleeve 52 and the mounting seat 5 , a sealing ring 64 is provided between the rotating sleeve 52 and the mounting seat 5 .

[0075] When in use, place the test piece in the climate box, open the sealing door 3, pull out the rotating plate clamping device 7 and fix the test piece on the rotating plate clamping device 7, first pull out the positioning rod 28 from the positioning through hole 27 and the insertion hole 26, at this time, the swing rod 21 rotates downward under the action of gravity, and the two sides of the rotating ring 15 are unobstructed, and then the tightening screw 39 is screwed to drive the tightening plate 40 away from the rotating ring 15, and the adjusting ring 32 can rotate relative to the rotating ring 15, and then take the test piece and place it between the oppositely arranged V-shaped clamping plates 17, and align the two diagonal corners of the test piece with the angle of the V-shaped clamping plate 17 respectively, and align one diagonal corner of the test piece that is not sealed with the limit arc plate 82, Then, the adjusting ring 32 is rotated, the adjusting ring 32 drives the crown gear 33 to rotate, the crown gear 33 drives multiple groups of adjusting driven gears 34 to rotate synchronously, the adjusting driven gear 34 drives the concentric gear 35 to rotate synchronously, the concentric gear 35 drives the threaded sleeves 71 on both sides to rotate synchronously through the adjusting driving gear 36, and the adjusting screw 70 is driven to move and retract along the threaded sleeve 71 through the rotation of the threaded sleeve 71, thereby driving the two groups of first screw adjustment assemblies 13 and the two groups of second screw adjustment assemblies 81 to extend synchronously, the two groups of first screw adjustment assemblies 13 drive the two V-shaped clamping plates 17 to move synchronously toward the axis of the rotating ring 15 close to the test piece, and the two groups of second screw adjustment assemblies 81 drive the two limit arc plates 82 to rotate synchronously. Move toward the axis of the rotating ring 15 to approach the specimen, the two V-shaped clamping plates 17 and the two limiting arc plates 82 are synchronously moved from four directions to approach the specimen, so that the specimen is firmly clamped between the two V-shaped clamping plates 17 and the two limiting arc plates 82, the two V-shaped clamping plates 17 fit the two diagonal corners of the specimen to play a main clamping role, and the two limiting arc plates 82 limit the other two diagonal corners of the specimen to achieve a stable clamping effect. After the specimen is clamped and tightened, the tightening screw 39 is reversely screwed to drive the tightening plate 40 to approach the rotating ring 15, the tightening plate 40 is pressed against the rotating ring 15 and fixes the adjusting ring 32 to the side wall of the rotating ring 15, and then the swing rod 21 is rotated upward to align the plug hole 26 with the positioning through hole 27. Then reinsert the positioning rod 28 into the positioning through hole 27 and the insertion hole 26, and tighten the threaded end cap 29 on the end of the positioning rod 28, and then respectively screw the limit screws 24 on the two rocker arms 21 to drive the limit disk 22 to approach the side wall of the specimen and clamp and limit the side wall of the specimen. At this time, the four corners and the left and right sides of the specimen are clamped and fixed and cannot move. After the specimen is clamped, the rotary plate clamping device 7 is pushed back into the detection chamber 2 for reset. After resetting, the rotating gear ring 16 engages with the rotating drive gear 45, and the above operation is repeated to fix all specimens on the rotary plate clamping device 7, and each rotary plate clamping device 7 clamps one specimen. After the specimen is clamped, the sealing door 3 can be closed.

[0076] During detection, the rotating motor 47 is started, and the rotating motor 47 drives the active bevel gear 48 to rotate, and the active bevel gear 48 drives the driven bevel gear 49 and the rotating shaft 44 to rotate, and the rotating shaft 44 drives the rotating driving gear 45 to rotate, and the rotating driving gear 45 drives the rotating gear ring 16 to rotate, and the rotating gear ring 16 drives the rotating swivel 15 to rotate in the mounting hole 18, and the rotating swivel 15 drives the test piece clamped by the V-shaped clamping plate 17 and the limiting arc plate 82 to rotate in a circle, and the ball 25 on the side wall of the limiting plate 22 facilitates the rotation of the test piece relative to the limiting plate 22, and the eccentrically arranged limiting plate 22 can continuously change the clamping position during the rotation of the test piece to avoid obstruction, and the rotating plate clamping device 7 cooperates with the side limiting mechanism 19 to make the test piece contact with the airflow evenly.

[0077] When the air in the climate chamber is replaced, the air expansion motor 65 is started, and the air expansion motor 65 drives the air expansion gear 66 to rotate. The air expansion gear 66 drives the rotating sleeve 52 to rotate through the air expansion gear ring 67. The rotating sleeve 52 drives the air pipe 53 and the vertical air expansion piece 54 at the end of the air pipe 53 to rotate around the mounting seat 5. The push spring 62 pushes the side wall of the vertical air expansion piece 54 to always keep in contact with the side wall of the detection chamber 2. The vertical air expansion piece 54 rotates in a circle around the multiple sets of rotating plate clamping devices 7. The air inlet direction is continuously adjusted and changed around the test piece. At the same time, the rotating motor 47 also drives the test piece to rotate continuously through the rotating plate clamping device 7, thereby evenly diffusing the airflow to each position of each test piece.

[0078] During detection, the sampling pump 74 is started. When the formaldehyde measuring instrument 75 is used for measurement, the control valve 83 on the detection tube 1 78 is opened, and the sampling pump 74 draws out the mixed gas in the detection chamber 2 through the sampling pipeline 12 and sends it to the formaldehyde measuring instrument 75 through the detection tube 1 78 for immediate measurement. When the acetylacetone spectrophotometry is used for analysis and calculation of the formaldehyde content, the control valve 83 on the detection tube 2 79 is opened, and the sampling pump 74 draws out the mixed gas in the detection chamber 2 through the sampling pipeline 12 and sends it to the two-stage series absorption bottle 76 through the detection tube 2 79.

[0079] The method for detecting the formaldehyde emission of artificial board using a formaldehyde emission detection device for artificial board comprises the following steps:

[0080] 1. Pretreatment: When testing the formaldehyde emission of artificial boards, first pretreat the specimens. The specimen size is 500mm*500mm. Place the specimens at a temperature of (23±1)℃ and a relative humidity of (50±5)% for (15±2) days. The distance between the specimens is at least 25mm, so that the air can circulate freely on the surface of all specimens. The temperature and humidity are constant and the indoor air replacement rate is at least once per hour. The formaldehyde mass concentration in the indoor air cannot exceed 0.10mg / m³.

[0081] 2. Edge sealing: After the specimens have completed the balance pretreatment, they are sealed with aluminum tape (a 750mm length of each specimen is left unsealed);

[0082] 3. Placement of the specimen: After the edge sealing of the specimen is completed, place the specimen in the detection chamber 2 within 1 hour, open the sealing door 3, pull out the rotating plate clamping device 7 and fix the four corners of the specimen on the rotating plate clamping device 7, rotate the side limit mechanism 19 upward and fix the side limit mechanism 19, then adjust the side limit mechanism 19 to clamp and limit the two sides of the specimen, push the rotating plate clamping device 7 back into the detection chamber 2 to reset after the clamping is completed, and close the sealing door 3 after all the specimens are clamped;

[0083] 4. Climate chamber test: start the climate chamber body 1, set the temperature of the climate chamber body 1 to (23±0.5)℃, the relative humidity to (45±3)%, the air exchange rate to (1.0±0.05)h, and the load rate to (1.0±0.02)m² / m³; start the rotating motor 47 and the fan motor 65, the test duration is at least 10 days, and the test starts from the 7th day. The test period of formaldehyde release in the test piece is 1 day until it reaches a stable state;

[0084] 5. Sampling: When sampling and analyzing air, add 25 mL of distilled water to each of the two absorption bottles, connect them in series, start the sampling pump 74, control the air extraction speed at about 2 L / min, and extract at least 120 L of gas each time. When sampling, record the temperature and atmospheric pressure of the detection chamber 2. After sampling, fully mix the solutions of the two absorption bottles as the absorption liquid to be tested;

[0085] 6. Detection: Use acetylacetone spectrophotometry to analyze and calculate the formaldehyde content;

[0086] 7. Repeated sampling and testing: When the number of tests exceeds 4 times and the difference between the last two measurement results is less than 5%, it is considered that a stable state has been reached; the average of the last two measurement results is the final measurement value. If a stable state has not been reached within 28 days, the measurement value on the 28th day will be used as the measurement value of formaldehyde release in the stable state.

[0087] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0088] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A formaldehyde emission detection device for artificial board, comprising a climate chamber body, a clean constant temperature and humidity air supply system is arranged in the climate chamber body, a detection chamber with an opening on one side is arranged in the climate chamber body, a sealing door is installed at the opening of the detection chamber, an air inlet is arranged at the lower part of the inner wall of the detection chamber, and the clean constant temperature and humidity air supply system is connected to the air inlet, characterized in that: The bottom wall of the detection chamber is provided with an air inlet chamber, the upper wall of the air inlet chamber is provided with a mounting seat, the upper end of the mounting seat is provided with a support plate, the support plate is provided with a slidable and pullable rotating plate clamping device, the support plate is provided with a driving mechanism that drives the rotating plate clamping device to rotate, the mounting seat is rotatably connected with an adaptive uniform air expansion mechanism, the air inlet chamber is connected to the air inlet, the upper end of the air inlet chamber is connected to the adaptive uniform air expansion mechanism, the side wall of the detection chamber is provided with a sampling port, the sampling port is connected to the sampling detection mechanism, an airway is provided in the mounting seat, the airway is arranged along the axial direction of the mounting seat, the upper end of the air inlet chamber is connected to the airway, and the side wall of the mounting seat is arranged along the circumference Ventilation holes are arranged in the array distribution, the adaptive uniform air expansion mechanism comprises a rotating sleeve, an air pipe and a vertical air expansion member, the rotating sleeve is coaxially rotatably sleeved on the outside of the mounting seat, the vent is arranged in the rotating sleeve, the airway is connected with the rotating sleeve through the vent, the air pipe is connected to one side of the rotating sleeve, the vertical air expansion member is arranged at one end of the air pipe away from the rotating sleeve, the vertical air expansion member is arranged between the support plate and the side wall of the detection cavity, an air expansion cavity is arranged in the vertical air expansion member, the bottom end of the air expansion cavity is connected with the air pipe, the side wall of the air expansion cavity is provided with a vertical air expansion port, and an air expansion rotary drive for driving the rotating sleeve to rotate is arranged on one side of the rotating sleeve; The rotating plate clamping device is distributed in an equidistant array on the support plate, and the rotating plate clamping device includes a first screw adjustment component, a pull-out bracket, a rotating swivel, a rotating gear ring and a V-shaped clamping plate arranged at the end of the first screw adjustment component. The pull-out bracket is arranged on the support plate, and a mounting hole is provided on the pull-out bracket. The rotating swivel is rotatably arranged in the mounting hole, and the rotating gear ring is coaxially fixed to the side wall of the rotating swivel. The first screw adjustment component is installed on the inner wall of the rotating swivel along the radial direction of the rotating swivel. The first screw adjustment components are symmetrically arranged, and a V-shaped clamping plate is respectively provided at the end of each first screw adjustment component, and the V-shaped clamping plate is arranged to slide along the radial direction of the rotating swivel. The rotating gear ring is arranged above the driving mechanism and is transmission-connected to the driving mechanism, and the angle of the V-shaped clamping plate is 90°.

2. A formaldehyde emission detection device for artificial board according to claim 1, characterized in that: The length of the air pipe is greater than the length from the side wall of the support plate to the axis of the mounting seat. The air pipe includes a fixed air pipe and a sliding air pipe. The fixed air pipe is fixedly connected on one side of the rotating sleeve. The sliding air pipe is slidingly and sealingly connected to the fixed air pipe. A push spring is provided between the fixed air pipe and the vertical air expansion piece. The push spring pushes the side wall of the vertical air expansion piece to always maintain a state of contact with the side wall of the detection cavity. The vertical air expansion piece is provided at the end of the fixed air pipe away from the sliding air pipe, and the sliding air pipe is connected to the air expansion cavity.

3. A formaldehyde emission detection device for artificial board according to claim 2, characterized in that: The cam is provided with a plurality of holes, the holes being arranged on the side walls of the mounting plate, and the plurality of holes being arranged on the side walls of the mounting plate.

4. A formaldehyde emission detection device for artificial board according to claim 3, characterized in that: The sampling and detection mechanism includes a sampling pipeline, a sampling pump, a formaldehyde analyzer and a two-stage series absorption bottle. The sampling pipeline is connected to the sampling port, the sampling pump is arranged on the sampling pipeline, the end of the sampling pipeline away from the sampling port is connected to a three-way pipe, the other two ports of the three-way pipe are respectively connected to detection tube 1 and detection tube 2, and control valves are respectively provided on detection tube 1 and detection tube 2. The formaldehyde analyzer is installed on the side wall of the climate chamber body, the formaldehyde analyzer is connected to detection tube 1, and the side wall of the climate chamber body is provided with a mounting frame. The two-stage series absorption bottle is arranged on the mounting frame, one end of the two-stage series absorption bottle is provided with an input pipe, the input pipe is threadedly connected to detection tube 2, and the two-stage series absorption bottle is composed of two absorption bottles connected in series through pipelines.

5. A formaldehyde emission detection device for artificial board according to claim 4, characterized in that: The first screw adjustment assembly includes two groups of telescopic screw assemblies symmetrically arranged, the two groups of telescopic screw assemblies are parallel, the telescopic screw assembly includes an adjusting screw and a threaded sleeve, the threaded sleeve is rotatably arranged on the inner wall of the rotating ring, the adjusting screw is inserted into the threaded sleeve and is threadedly connected with the threaded sleeve.

6. A formaldehyde emission detection device for artificial board according to claim 5, characterized in that: The inner wall of the rotating ring is provided with two groups of second screw adjustment assemblies installed radially and symmetrically. The second screw adjustment assembly has the same structure as the first screw adjustment assembly. The second screw adjustment assembly and the first screw adjustment assembly are perpendicular to each other, and a limiting arc plate is installed at the end of the second screw adjustment assembly.

7. A formaldehyde emission detection device for artificial board according to claim 6, characterized in that: The rotating ring is provided with an adjusting drive for driving the two groups of first screw adjustment assemblies and the two groups of second screw adjustment assemblies to extend and retract synchronously, the adjusting drive comprising an adjusting ring, a crown gear, an adjusting driven gear, a concentric gear and an adjusting driving gear, the adjusting ring is rotatably arranged on the side wall of the rotating ring, the crown gear is coaxially fixedly arranged on the side wall of the adjusting ring, the end face of the crown gear is provided with gear teeth, the adjusting driven gear is rotatably arranged on the inner side wall of the rotating ring, and four groups of adjusting driven gears are distributed in a circumferential array on the inner wall of the rotating ring, two groups of adjusting driven gears are respectively rotatably arranged in the two groups of first screw adjustment assemblies, and the other two groups of adjusting driven gears are respectively rotatably arranged in the two groups of second screw adjustment assemblies, and an adjusting driven gear is respectively rotatably arranged between two parallel and adjacent threaded sleeves, the crown gear is meshed with the adjusting driven gear, the concentric gear is coaxially fixedly arranged with the adjusting driven gear, the adjusting driving gear is coaxially fixedly arranged on the outside of the threaded sleeve, and the concentric gear is meshed with the adjusting driving gear.

8. The formaldehyde emission detection device for artificial board according to claim 7, characterized in that: The adjusting swivel is provided with a tightening assembly, which includes a tightening sleeve, a tightening screw and a tightening plate arranged at the end of the tightening screw. The tightening sleeve is fixedly penetrated through the side wall of the adjusting swivel, the tightening screw is penetrated through the tightening sleeve and is threadedly connected with the tightening sleeve, and the tightening plate is arranged at one end of the tightening screw close to the rotating swivel.

9. The formaldehyde emission detection device for artificial board according to claim 8, characterized in that: The driving mechanism includes a rotating shaft and a rotating driving gear, and fixed brackets are symmetrically arranged on the support plate, and the rotating shaft is rotatably arranged between the fixed brackets. The rotating driving gear is coaxially fixedly arranged on the rotating shaft, and the rotating driving gear is distributed in an axial array along the rotating shaft. A rotating motor for driving the rotating shaft to rotate is provided on the support plate, and a rotating gear ring is rotatably arranged above the rotating driving gear, and the rotating gear ring is meshed with the rotating driving gear; the air expansion rotary drive includes an air expansion motor, an air expansion gear and an air expansion gear ring, and the air expansion gear ring is coaxially fixedly arranged at the bottom end of the rotating sleeve, and the air expansion gear is rotatably arranged on the upper wall of the air inlet chamber, and the air expansion gear is meshed with the air expansion gear ring, and the air expansion motor is arranged in the air inlet chamber, and a transmission shaft is provided between the output end of the air expansion motor and the air expansion gear, and the transmission shaft rotates through the upper wall of the air inlet chamber.

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