VOC emission detection device for automotive interior materials

Abstract

This invention belongs to the field of automotive interior material testing technology and discloses a VOC release detection device for automotive interior materials. The device includes: a rotating support frame; a detection chamber assembly rotatably mounted on the rotating support frame, the detection chamber assembly including a main housing and a sealing cover mechanism, which cooperate to form a sealed detection chamber; and a suspension clamping assembly disposed within the detection chamber for clamping the sheet-like test material and physically dividing the detection chamber into a first chamber and a second chamber. This invention constructs a breathing circulation system through an oil-free pump suction mechanism combined with a bellows buffer mechanism, driving gas to reciprocate through the test material. Combined with a rotating inverted structure, gravity is used to accumulate the excitation medium on the material surface. Under the action of alternating airflow, cyclic excitation of fluidized suspension and compaction contact is generated, thereby effectively destroying the gas boundary layer under microscopic hammering and friction, significantly improving the deep VOC desorption rate and detection accuracy.

Description

Technical Field

[0001] This invention belongs to the field of automotive interior material testing technology, specifically a VOC release detection device for automotive interior materials. Background Technology

[0002] Automotive interior materials release volatile organic compounds (VOCs) under certain temperature conditions. The amount and rate of release directly affect the assessment of passenger cabin air quality and the verification of material selection. To obtain comparable test results, it is usually necessary to perform temperature-controlled treatment on sheet-like samples in a closed space and collect and analyze the gas inside the cavity to reflect the release characteristics of the samples under specified operating conditions.

[0003] Existing VOC release detection devices mostly use static or unidirectional circulation to exchange or mix the gas in a closed cavity. The sample is often fixed in the cavity with a clamp or bracket. Since sheet samples usually need to be cut and prepared, edge leakage makes it impossible to accurately measure the transmittance in the thickness direction. Moreover, the migration of volatile organic compounds inside the material to the surface depends entirely on the concentration gradient, and the mass transfer efficiency across the gas-solid interface is extremely low, resulting in long detection time and difficulty in releasing deep residues, and distorted detection data. Summary of the Invention

[0004] The purpose of this invention is to provide a VOC emission detection device for automotive interior materials to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a VOC release detection device for automotive interior materials, comprising: Rotating support frame; The detection chamber assembly is rotatably mounted on the rotating support frame. The detection chamber assembly includes a main housing and a sealing cover mechanism, which cooperate to form a sealed detection chamber. A suspension clamping assembly is disposed within the detection chamber for clamping the sheet-shaped test material and physically dividing the detection chamber into a first chamber and a second chamber; the suspension clamping assembly is provided with an edge sealing structure configured to cover the circumferential cross-section of the test material. The particulate excitation medium is confined within the first chamber; The breathing and circulation system includes an oil-free pump suction mechanism disposed on the sealing cover mechanism and a bellows buffer mechanism communicating with the detection chamber; the oil-free pump suction mechanism is used to generate alternating airflow, which, in conjunction with the passive volume change of the bellows buffer mechanism, drives the gas through the test material for respiratory exchange. When the opening of the main housing faces upward, the particulate excitation medium is stored in the storage area of ​​the first chamber; when the detection chamber assembly on the rotating support frame is flipped, the main housing is located above the sealing cover mechanism, and the particulate excitation medium leaves the storage area under the action of gravity and accumulates on the surface of the material being tested, generating mechanical excitation on the material being tested under the action of alternating airflow and gravity.

[0006] Preferably, the suspended clamping assembly includes a first clamping frame and a second clamping frame; The first clamping frame is provided with an adapter groove, and the second clamping frame is provided with a protruding positioning frame; when the first clamping frame and the second clamping frame are closed, the positioning frame is embedded in the adapter groove and forms a pressing seal on the edge of the material being tested. The inner wall of the first clamping frame is provided with a limiting net, and the limiting net and the inner wall of the first clamping frame form a storage area; the inner wall of the main box is provided with an elastic support mechanism, which includes a sleeve fixed inside the main box, a sleeve rod slidably inserted into the sleeve, and a spring disposed inside the sleeve; one end of the sleeve rod is connected to the first clamping frame, and the other end is fixedly connected to the spring, configured to push the first clamping frame out by the restoring force of the spring when the cover is open; the sealing cover mechanism is provided with a linkage pusher, configured to press down the second clamping frame and the first clamping frame to overcome the resistance of the spring and enter the detection chamber during the closing process.

[0007] Preferably, the oil-free pump suction mechanism includes: The pump cylinder is fixedly mounted on the sealing cover mechanism and communicates with the first chamber; The pump suction piston is dynamically sealed and slidably fitted inside the pump casing; A linear drive unit is connected to the pump suction piston and is used to drive it to perform reciprocating linear motion; The inner wall of the pump cylinder and the outer wall of the pump piston are fitted with a dry self-lubricating combination of glass and graphite, or ceramic and ceramic.

[0008] Preferably, the bellows buffer mechanism is connected to the side wall of the main housing, and its structure is a metal bellows assembly. The assembly is formed by welding several metal diaphragms to form an airtight elastic volume with one end open and the other end closed. The open end of the metal bellows assembly is sealed and welded to the main housing. It uses its own axial elastic stiffness to passively expand or contract and buffer with the air pressure fluctuation in the detection chamber.

[0009] Preferably, the inner wall of the main housing is provided with an auxiliary sealing mechanism, which includes a high-temperature resistant elastic airbag, an air sleeve, a movable plug, and an adjusting rod. The high-temperature resistant elastic airbag is surrounded on the inner wall of the main housing and is made of fluororubber or perfluoroether rubber. The air sleeve is connected to the inside of the high-temperature resistant elastic airbag through the vent hole on the side of the main housing. The adjusting rod is threaded to the air sleeve. By pushing the movable plug to compress the gas in the air sleeve, the high-temperature resistant elastic airbag expands and fills the gap between the sealing suspension clamping assembly and the inner wall of the main housing. When the high-temperature resistant elastic airbag expands, it fills the space between the second clamping frame and the first clamping frame.

[0010] Preferably, it also includes a gas path switching valve connected to the detection chamber, and the outer end of the gas path switching valve is connected to an outlet collection mechanism; The outlet collection mechanism is configured to connect to an external active gas sampling pump; the gas path switching valve is configured to have a circulation mode and a sampling mode: in the circulation mode, the gas path switching valve is closed to maintain the reciprocating penetration circulation of the detection chamber; in the sampling mode, the gas path switching valve is opened, the auxiliary sealing mechanism releases pressure to release the seal on the side of the suspension clamping assembly, and cooperates with the external active gas sampling pump to extract the gas in the detection chamber through the outlet collection mechanism.

[0011] Preferably, a quick-locking mechanism is provided between the sealing cover mechanism and the main housing. The quick-locking mechanism includes a positioning threaded rod fixed to the outer wall of the main housing, a mating notch opened on the edge of the sealing cover mechanism, and a threaded locking ring. The locking ring provides axial clamping force when tightened.

[0012] Preferably, the inner wall of the main chamber and the sealing cover mechanism are both integrated with electric heating elements to heat the detection chamber components and particulate excitation medium to a preset VOC release temperature.

[0013] Preferably, the rotating support frame includes: The base and the bearing seats located on both sides of the base; The rotating shafts connected to both sides of the main housing are rotatably supported on the bearing seats, wherein at least one side of the rotating shaft is hollow, and the control lines and pipelines of the oilless pump suction mechanism and the auxiliary sealing mechanism pass through the hollow rotating shaft. The base is also provided with an angle locking component, which includes a sleeve fixed to the side of the base and sleeved on the outside of the rotating shaft, and a pin movably inserted into the sleeve. The outer wall of the rotating shaft is provided with symmetrical insertion holes. The detection chamber component is restricted and positioned by inserting the pin into the insertion holes.

[0014] Preferably, the linear drive unit is an electric push rod or a linear motor, which is installed outside the sealing cover mechanism and connected to the pump suction piston through its free end to control the movement of the pump suction piston.

[0015] The beneficial effects of this invention are as follows: 1. This invention constructs a breathing cycle system by using an oil-free pump suction mechanism in conjunction with a bellows buffer mechanism to drive gas to reciprocate through the material being tested. Combined with a rotating inverted structure, gravity is used to cause the excitation medium to accumulate on the material surface. Under the action of alternating airflow, a cyclic excitation of fluidized suspension and compaction contact is generated, thereby effectively destroying the gas boundary layer under the action of micro-hammering and friction, significantly improving the deep VOC desorption rate and detection accuracy.

[0016] 2. This invention utilizes the interlocking structure of the suspended clamping component to physically press the edge of the material being tested, and in conjunction with a high-temperature resistant elastic airbag to fill the gap between the clamping frame and the housing, a double edge sealing system is constructed. This effectively blocks the VOC leakage path of the material's circumferential cross-section, prevents lateral release from interfering with the test results, and improves the accuracy of the test data.

[0017] 3. This invention utilizes a rotating inverted structure to allow gravity to deposit the excitation medium on the material surface. Under the action of alternating airflow, it generates cyclic excitation of fluidized suspension and compaction contact. The high-frequency mechanical disturbance not only accelerates the desorption of VOC molecules through physical impact, but also achieves surface self-cleaning through the random jumping and friction of particles. It effectively shakes off and separates dust particles from the material surface, preventing dust from clogging the material's micropores or adsorbing VOCs, thus ensuring the smooth flow of gas penetration channels and the stability of the detection process.

[0018] 4. This invention utilizes particulate excitation medium as a contact heat storage carrier. The particles store heat in the heating environment and are tightly compacted onto the surface of the material under test during the suction negative pressure stage. Compared with traditional single hot air convection heating, solid contact heat transfer significantly reduces interfacial thermal resistance and increases the heating rate of the material under test. The nonlinear effect excited by contact heat further accelerates the release of high-boiling-point stubborn VOC components. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a partial cross-sectional view of the present invention; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 This is an exploded schematic diagram of the detection chamber assembly of the present invention; Figure 6 This is an exploded view of the suspension clamping assembly of the present invention; Figure 7 This is a cross-sectional view of the oil-free pump suction mechanism and the suspension clamping assembly of the present invention; Figure 8 This is a schematic diagram of the elastic support mechanism of the present invention.

[0020] In the diagram: 1. Rotary support frame; 101. Base; 102. Bearing seat; 103. Rotating shaft; 2. Detection chamber assembly; 201. Main housing; 202. Sealing cover mechanism; 3. Suspension clamping assembly; 301. First clamping frame; 302. Second clamping frame; 303. Adaptor groove; 304. Positioning frame; 4. Particulate excitation medium; 5. Oil-free pump suction mechanism; 501. Pump cylinder; 502. Pump suction piston; 503. Linear drive unit; 6. Bellows buffer mechanism; 7. Limiting net; 8. Elastic support mechanism; 801 1. Sleeve; 802. Sleeve rod; 803. Spring; 9. Linkage pusher; 10. Auxiliary sealing mechanism; 1001. High-temperature resistant elastic airbag; 1002. Air sleeve; 1003. Movable plug; 1004. Adjusting rod; 11. Air circuit switching valve; 12. Quick locking mechanism; 1201. Positioning threaded rod; 1202. Mating notch; 1203. Locking ring; 13. Electric heating element; 14. Angle locking assembly; 1401. Sleeve; 1402. Pin; 1403. Insertion hole; 15. Outlet collection mechanism. Detailed Implementation

[0021] like Figures 1 to 8 As shown, the VOC emission detection device for automotive interior materials includes a rotating support frame 1, a detection chamber assembly 2, a suspension clamping assembly 3, a particulate excitation medium 4, and a breathing circulation system. The detection chamber assembly 2 is rotatably mounted on the rotating support frame 1. The detection chamber assembly 2 includes a main housing 201 and a sealing cover mechanism 202, which cooperate to form a sealed detection chamber. The suspension clamping assembly 3 is disposed within the detection chamber and is used to clamp the sheet-like test material and divide the detection chamber into a first chamber and a second chamber, wherein the first chamber is connected to the breathing circulation system. The suspension clamping assembly 3 has an edge sealing structure to cover the circumferential cross-section of the test material, so that gas exchange between the first chamber and the second chamber mainly occurs through the thickness direction of the test material.

[0022] The rotating support frame 1 includes a base 101 and bearing seats 102 disposed on both sides of the base 101. Rotating shafts 103 are connected to both sides of the main housing 201, and the rotating shafts 103 are rotatably supported on the bearing seats 102. An angle locking assembly is provided on the base 101. The angle locking assembly includes a sleeve fitted onto the outside of the rotating shaft 103 and a pin movably inserted into the sleeve. Symmetrical insertion holes are provided on the outer wall of the rotating shaft 103. The pin is inserted into different insertion holes to limit the detection chamber assembly 2 to an upright or inverted position and maintain stability. At least one rotating shaft 103 can be configured as a hollow structure for accommodating pneumatic or electrical connections, reducing the risk of interference from exposed pipelines during the inversion process.

[0023] The suspended clamping assembly 3 includes a first clamping frame 301 and a second clamping frame 302. The first clamping frame 301 has an adapter groove 303, and the second clamping frame 302 has a positioning frame 304 protruding towards the first clamping frame 301. When the first clamping frame 301 and the second clamping frame 302 are closed, the positioning frame 304 embeds into the adapter groove 303 and forms a pressing edge on the edge of the material being tested, thus constituting an edge sealing structure, ensuring that the circumferential cross-section of the material being tested is in a sealed covering state. To improve the stability of the edge seal, an elastic sealing strip or sealing coating can be provided inside the adapter groove 303. After the positioning frame 304 and the adapter groove 303 are closed, a continuous pressing surface is formed.

[0024] A limiting mesh 7 is provided on the inner wall of the first clamping frame 301, forming a storage area between the limiting mesh 7 and the inner wall of the first clamping frame 301. The granular excitation medium 4 is laid in the storage area and confined within the first chamber by the limiting mesh 7. The limiting mesh 7 can be a metal wire mesh or a perforated plate structure, with a pore size smaller than the minimum particle size of the granular excitation medium 4. When the device is in an upright position and the opening of the main housing 201 faces upward, the granular excitation medium 4 remains in the storage area; when the device is flipped to an inverted position and the main housing 201 is above the sealing cover mechanism 202, the granular excitation medium 4 leaves the storage area under the action of gravity and accumulates on the surface of the material being tested.

[0025] An elastic support mechanism 8 is provided inside the main housing 201. The elastic support mechanism 8 is configured to push the first clamping frame 301 to the vicinity of the opening of the main housing 201 when the sealing cover mechanism 202 is opened, so as to facilitate the placement and removal of the material to be tested. The sealing cover mechanism 202 is provided with a linkage pusher 9. The linkage pusher 9 is configured to press down the second clamping frame 302 and the first clamping frame 301 into the detection chamber and achieve positioning during the closing process of the sealing cover mechanism 202. The elastic support mechanism 8 may include a fixed sleeve 801, a spring 803 and a sleeve rod 802. The sleeve rod 802 is connected to the first clamping frame 301. The restoring force of the spring 803 is used to push out the first clamping frame 301. The linkage pusher 9 may be a push plate or pressure block fixed inside the sealing cover mechanism 202. When the sealing cover mechanism 202 is closed, the push plate or pressure block contacts the second clamping frame 302 and drives the clamping frame assembly to move as a whole into the main box 201. A limiting part is provided on the inner wall of the main box 201 to limit the downward pressing end position of the clamping frame assembly, thereby ensuring that the relative position is consistent after each clamping.

[0026] The respiratory circulation system includes an oil-free pump suction mechanism 5 and a bellows buffer mechanism 6. The oil-free pump suction mechanism 5 is mounted on the sealing cover mechanism 202 and communicates with the first chamber. The oil-free pump suction mechanism 5 includes a pump cylinder 501, a pump suction piston 502, and a linear drive unit 503. The pump cylinder 501 is fixedly mounted on the sealing cover mechanism 202, and the pump suction piston 502 is dynamically and slidably mounted inside the pump cylinder 501. The linear drive unit 503 is connected to the pump suction piston 502 and drives it to reciprocate linearly. The pump cylinder 501 and the pump suction piston 502 can adopt a dry self-lubricating fit to reduce the influence of volatile lubricating media on the gas in the detection chamber. The linear drive unit 503 can be installed on the outside of the sealing cover mechanism 202 and drives the pump suction piston 502 through a transmission connector.

[0027] The bellows buffer mechanism 6 is connected to the side wall of the main housing 201. The bellows buffer mechanism 6 is an airtight elastic volume structure. Its open end is sealed to the main housing 201, and its closed end forms a variable volume cavity. When the pressure inside the cavity changes, the bellows buffer mechanism 6 expands or contracts to achieve volume compensation and pressure buffering.

[0028] An auxiliary sealing mechanism 10 is embedded in the inner wall of the main housing 201. The auxiliary sealing mechanism 10 includes a high-temperature resistant elastic airbag 1001, an air sleeve 1002, a movable plug 1003, and an adjusting rod 1004. The high-temperature resistant elastic airbag 1001 is arranged around an annular groove in the inner wall of the main housing 201. The adjusting rod 1004 is threaded to the air sleeve 1002. When the adjusting rod 1004 pushes the movable plug 1003 to compress the gas in the air sleeve 1002, the gas enters the high-temperature resistant elastic airbag 1001 through the ventilation channel at the bottom of the air sleeve 1002, causing the high-temperature resistant elastic airbag 1001 to expand and fill the gap between the outer periphery of the suspension clamping assembly 3 and the inner wall of the main housing 201. It can further fill the gap between the first clamping frame 301 and the second clamping frame 302 to suppress bypass leakage around the clamping frame. The high-temperature resistant elastic airbag 1001 is preferably made of fluororubber or perfluoroether rubber material, and its exposed area in the detection chamber is reduced by embedding.

[0029] The device also includes an outlet collection mechanism 15 connected to the detection chamber and a gas path switching valve 11. The outer end of the gas path switching valve 11 is connected to the outlet collection mechanism 15, and the outlet collection mechanism 15 has an adsorption collection section inside. The gas path switching valve 11 has a circulation mode and a sampling mode. In the circulation mode, the gas path switching valve 11 is closed to maintain the reciprocating penetration circulation of the detection chamber. In the sampling mode, the gas path switching valve 11 is open and connected to an external sampling pipeline. At the same time, the auxiliary sealing mechanism 10 can release the seal to connect the first chamber and the second chamber. The outlet collection mechanism 15 is configured to be connected to an external active gas sampling pump (such as a constant flow sampler). In the sampling mode, the negative pressure suction of the external sampling pump is used to forcibly extract the gas in the detection chamber through the outlet collection mechanism 15 and deliver it to the connected adsorption tube for collection.

[0030] A quick-locking mechanism 12 is provided between the sealing cover mechanism 202 and the main housing 201. The quick-locking mechanism 12 includes a positioning threaded rod 1201, a mating notch 1202 and a locking ring 1203. After the sealing cover mechanism 202 is closed, the positioning threaded rod 1201 is fitted through the mating notch 1202 and the locking ring 1203 is tightened to provide axial clamping force, thereby ensuring the sealing and stability of the sealing cover mechanism 202 and the main housing 201 during repeated assembly and disassembly.

[0031] An electric heating element 13 is installed on the inner wall of the main chamber 201 and inside the sealing cover mechanism 202. The electric heating element 13 is arranged along the circumference of the inner wall of the main chamber 201 and the inner side of the sealing cover mechanism 202 to form the upper and lower and circumferential thermal boundaries of the detection chamber. The particulate excitation medium 4 is located in the detection chamber and is in contact with or adjacent to the material being tested. Under the heating action of the electric heating element 13, the particulate excitation medium 4 and the gas in the detection chamber are heated together, so that the material being tested is under the set temperature conditions during the detection process.

[0032] Working principle Step 1: Loading and Pre-sealing The operator pulls out the pin, rotates the test chamber assembly 2 to the loading position with the main body 201 opening facing upwards, loosens the quick locking mechanism 12 and removes the sealing cover mechanism 202. At this time, the elastic support mechanism 8 pushes out the first clamping frame 301. The operator lays the single-layer sheet material to be tested flat on the surface of the first clamping frame 301, then closes the sealing cover mechanism 202. The linkage pusher 9 presses down the second clamping frame 302 and the first clamping frame 301, so that the positioning frame 304 is embedded in the adapter groove 303 to complete the edge sealing. At the same time, the floating clamping assembly 3 is pushed into the chamber, the locking ring 1203 is tightened, and the adjusting rod 1004 is rotated to inflate the high-temperature resistant elastic airbag 1001 to complete the side wall auxiliary sealing. Step 2: Flip the fabric and heat it. The operator pulls out the pin, drives the detection chamber assembly 2 to rotate 180 degrees around the pivot 103 to the detection posture (main chamber on top) and locks it. During this process, the particulate excitation medium 4 is released from the limiting net 7 under the action of gravity, and is evenly sprinkled and covered on the surface of the material being tested (i.e. the original back side). The electric heating element 13 is turned on to heat the chamber to the preset release temperature.

[0033] Step 3: Breathing pump and mechanical excitation The linear drive unit 503 is activated to control the oilless pump suction mechanism 5 to perform a breathing cycle. When the pump suction piston 502 is pushed in (exhalation), the air pressure in the first chamber increases, and the gas forces the test material to bulge slightly downward and pass through the micropores of the material into the second chamber. The bellows buffer mechanism 6 is passively extended under pressure to buffer the pressure. When the pump suction piston 502 is pulled out (inhalation), a negative pressure is formed in the first chamber, and the bellows buffer mechanism 6 retracts, squeezing the gas back and penetrating the material in the opposite direction. During this alternating airflow process, the particulate excitation medium 4 accumulated on the material surface is in a cyclic state of "fluidized suspension and compacted contact". When the airflow penetrates, the particle layer loosens and jumps randomly, performing microscopic hammering and friction on the material surface, destroying the gas boundary layer. When the airflow reverses, the particle layer compacts the material tightly, and the high heat capacity of the zirconia beads is used for contact heat transfer. The combined effect of mechanical excitation and heat conduction significantly accelerates the desorption of deep VOCs. Step 4: Sampling and Collection Once the release reaches equilibrium, the gas path switching valve 11 is switched to sampling mode. At this time, the auxiliary sealing mechanism 10 is depressurized, the high-temperature resistant elastic airbag 1001 retracts, and the first chamber and the second chamber are connected to eliminate internal dead zones. Subsequently, the external active gas sampling pump (such as a constant flow sampler) is connected to the outlet collection mechanism 15 on the side wall of the main housing 201. The external sampling pump is started, and a strong negative pressure is formed in the detection chamber to overcome the pipeline resistance and forcefully and completely extract the VOC gas enriched in the chamber and send it into the adsorption tube (such as a Tenax TA tube) for collection.

Claims

1. A VOC emission detection device for automotive interior materials, characterized in that, include: Rotary support frame (1); The detection chamber assembly (2) is rotatably mounted on the rotating support frame (1). The detection chamber assembly (2) includes a main housing (201) and a sealing cover mechanism (202), which together form a sealed detection chamber. The suspension clamping assembly (3) is disposed in the detection cavity and is used to clamp the sheet-shaped test material and physically divide the detection cavity into a first chamber and a second chamber; the suspension clamping assembly (3) is provided with an edge sealing structure and is configured to cover the circumferential cross-section of the test material; The particulate excitation medium (4) is confined within the first chamber; The respiratory circulation system includes an oil-free pump suction mechanism (5) disposed on the sealing cover mechanism (202) and a bellows buffer mechanism (6) connected to the detection chamber; the oil-free pump suction mechanism (5) is used to generate alternating airflow, which, in conjunction with the passive volume change of the bellows buffer mechanism (6), drives the gas through the test material for respiratory exchange. When the opening of the main housing (201) faces upward, the particulate excitation medium (4) is stored in the storage area of ​​the first chamber; when the detection chamber assembly (2) on the rotating support frame (1) is flipped, the main housing (201) is located above the sealing cover mechanism (202), and the particulate excitation medium (4) leaves the storage area under the action of gravity and accumulates on the surface of the material to be tested, generating mechanical excitation on the material to be tested under the action of alternating airflow and gravity.

2. The VOC release detection device for automotive interior materials according to claim 1, characterized in that: The suspended clamping assembly (3) includes a first clamping frame (301) and a second clamping frame (302); The first clamping frame (301) is provided with an adapter groove (303), and the second clamping frame (302) is provided with a protruding positioning frame (304); when the first clamping frame (301) and the second clamping frame (302) are closed, the positioning frame (304) is embedded in the adapter groove (303) and forms a tight seal on the edge of the material being tested; The inner wall of the first clamping frame (301) is provided with a limiting net (7), and the limiting net (7) and the inner wall of the first clamping frame (301) form a storage area; the inner wall of the main box (201) is provided with an elastic support mechanism (8), the elastic support mechanism (8) includes a sleeve (801) fixed inside the main box (201), a sleeve rod (802) slidably inserted into the sleeve (801) and a spring (803) set in the sleeve (801); one end of the sleeve rod (802) is connected to the first clamping frame (301), and the other end is fixedly connected to the spring (803), configured to push the first clamping frame (301) out by the restoring force of the spring (803) when the cover is open; the sealing cover mechanism (202) is provided with a linkage pusher (9), configured to press down the second clamping frame (302) and the first clamping frame (301) during the closing process to overcome the resistance of the spring (803) and enter the detection chamber.

3. The VOC release detection device for automotive interior materials according to claim 1, characterized in that: The oil-free pump suction mechanism (5) includes: The pump cylinder (501) is fixedly mounted on the sealing cover mechanism (202) and communicates with the first chamber; The pump suction piston (502) is dynamically sealed and slidably fitted into the pump cylinder (501); A linear drive unit (503) is connected to the pump suction piston (502) and is used to drive it to perform reciprocating linear motion; The inner wall of the pump barrel (501) and the outer wall of the pump suction piston (502) are made of glass and graphite or ceramic and ceramic in a dry self-lubricating fit.

4. The VOC release detection device for automotive interior materials according to claim 1, characterized in that: The bellows buffer mechanism (6) is connected to the side wall of the main housing (201), and its structure is a metal bellows assembly. The assembly is formed by welding several metal diaphragms to form an airtight elastic volume with one end open and the other end closed. The open end of the metal bellows assembly is sealed and welded to the main housing (201). It uses its own axial elastic stiffness to passively expand or contract and buffer with the air pressure fluctuation in the detection chamber.

5. The VOC release detection device for automotive interior materials according to claim 1, characterized in that: The inner wall of the main housing (201) is provided with an auxiliary sealing mechanism (10), which includes a high-temperature resistant elastic airbag (1001), an air sleeve (1002), a movable plug (1003), and an adjusting rod (1004). The high-temperature resistant elastic airbag (1001) is arranged around the inner wall of the main box (201) and is made of fluororubber or perfluoroether rubber. The air sleeve (1002) is connected to the inside of the high-temperature resistant elastic airbag (1001) through the ventilation hole provided on the side of the main box (201). The adjusting rod (1004) is threaded to the air sleeve (1002). By pushing the movable plug (1003) to compress the gas in the air sleeve (1002), the high-temperature resistant elastic airbag (1001) expands and fills the gap between the sealing suspension clamping assembly (3) and the inner wall of the main box (201). When the high-temperature resistant elastic airbag (1001) expands, it fills the space between the second clamping frame (302) and the first clamping frame (301).

6. The VOC emission detection device for automotive interior materials according to claim 1, characterized in that: It also includes a gas path switching valve (11) connected to the detection chamber, and the outer end of the gas path switching valve (11) is connected to an outlet collection mechanism (15). The outgoing collection mechanism (15) is configured to connect to an external active gas sampling pump; the gas path switching valve (11) is configured to have a circulation mode and a sampling mode: in the circulation mode, the gas path switching valve (11) is closed to maintain the reciprocating penetration circulation of the detection chamber; In sampling mode, the gas path switching valve (11) is opened, the auxiliary sealing mechanism (10) releases pressure and releases the seal on the side of the suspension clamping assembly (3), and the gas in the detection chamber is extracted through the outlet collection mechanism (15) in conjunction with the external active gas sampling pump.

7. The VOC release detection device for automotive interior materials according to claim 1, characterized in that: A quick-locking mechanism (12) is provided between the sealing cover mechanism (202) and the main housing (201). The quick-locking mechanism (12) includes a positioning threaded rod (1201) fixed to the outer wall of the main housing (201), a mating notch (1202) opened on the edge of the sealing cover mechanism (202), and a threaded locking ring (1203). The locking ring (1203) provides axial clamping force when tightened.

8. The VOC release detection device for automotive interior materials according to claim 1, characterized in that: The inner wall of the main housing (201) and the sealing cover mechanism (202) are both equipped with electric heating elements (13) for heating the detection chamber assembly (2) and the particulate excitation medium (4) to the preset VOC release temperature.

9. The VOC release detection device for automotive interior materials according to claim 1, characterized in that: The rotating support frame (1) includes: Base (101) and bearing seats (102) disposed on both sides of base (101); The rotating shafts (103) connected to both sides of the main housing (201) are rotatably supported on the bearing seats (102), wherein at least one of the rotating shafts (103) is hollow, and the control lines and pipelines of the oilless pump suction mechanism (5) and the auxiliary sealing mechanism (10) pass through the hollow rotating shaft (103); The base (101) is also provided with an angle locking assembly (14). The angle locking assembly (14) includes a sleeve (1401) fixed to the side of the base (101) and sleeved on the outside of the rotating shaft (103), and a pin (1402) movably inserted into the sleeve (1401). The outer wall of the rotating shaft (103) is provided with symmetrical insertion holes (1403). The pin (1402) is inserted into the insertion hole (1403) to restrict and position the detection chamber assembly (2).

10. The VOC release detection device for automotive interior materials according to claim 3, characterized in that: The linear drive unit (503) is an electric push rod or a linear motor, which is installed outside the sealing cover mechanism (202) and connected to the pump suction piston (502) through its free end to control the movement of the pump suction piston (502).

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