Chemical wastewater VOC content detection device

Abstract

The chemical wastewater VOC content detection device comprises a sampling shell, a sampling container and a rotating disc, and a pipe body is arranged in the middle of the rotating disc; a driving disc is movably arranged at the upper end in the pipe body, and the upper end of the driving disc upwards penetrates out of the sampling shell and is movably sleeved with an adjusting ring; two extraction mechanisms are arranged on the rotating disc in the pipe body in a sliding manner; a piston column in transmission connection with the outer wall of the pipe body is slidably arranged on the outer wall of the pipe body in the sampling shell, and the upper end of the piston column outwards penetrates out of the sampling shell; the driving disc is provided with a connecting valve which is communicated with the gas phase mass spectrometer; a first magnetic part is arranged at the bottom of the communicating valve; a second magnetic part is arranged at the top of the extraction mechanism; the extraction mechanisms are in transmission connection with the driving disc, and when the driving disc slides, the driving disc enables one extraction mechanism to relatively move to the position under the communicating valve; the VOC thermal desorption-gas chromatography detection device can directly perform thermal desorption-gas chromatography detection on the VOC on the two extraction strips, so that the accuracy of the detection result is improved, the operation is simple, and the problem of secondary pollution is favorably avoided.

Description

Technical Field

[0001] The invention relates to the technical field of VOC content detection, and in particular to a device for detecting VOC content in chemical wastewater. Background Art

[0002] In the field of environmental protection and pollution control, the volatile organic compound (VOC) content in chemical wastewater is an important detection indicator. Traditional VOC detection technologies include direct injection gas chromatography (GC), gas chromatography-mass spectrometry (GC-MS), liquid chromatography (LC), and Fourier transform infrared spectroscopy (FTIR).

[0003] However, these detection technologies require complex sample processing: sample pretreatment is required, such as solvent extraction, solid phase microextraction, etc., and these steps are often time-consuming and may introduce contamination, affecting the accuracy of the test results. At the same time, some also require the use of organic solvents, which not only increases the complexity of the operation, but may also cause secondary pollution problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a chemical wastewater VOC content detection device, so that the VOC on the two extraction strips can be directly subjected to thermal desorption-gas chromatography detection, thereby improving the accuracy of the detection results, simplifying the operation, and helping to avoid secondary pollution problems.

[0005] To achieve the above object, the specific scheme of the present invention is as follows:

[0006] A chemical wastewater VOC content detection device comprises a sampling shell, a sampling container is arranged at the lower end of the sampling shell, a rotating disk is rotatably arranged at the top of the sampling container, and a tube body is arranged in the middle of the rotating disk; a driving disk is movably arranged at the upper end of the tube body, and the upper end of the driving disk passes upward through the sampling shell and is movably sleeved with an adjustment ring for making the driving disk slide relative to the tube body; the rotating disk is slidably arranged in the tube body and two extraction mechanisms are connected with the sampling container;

[0007] A piston column is provided inside the sampling shell and is slidably disposed on the outer wall of the tube body and is transmission-connected to the outer wall of the tube body. The upper end of the piston column passes out of the sampling shell. When the piston column moves up and down relative to the sampling shell, it can drive the rotating disk to rotate.

[0008] The driving disk is provided with a connecting valve, which is connected to the gas phase mass spectrometer through the driving disk; a first magnetic component is provided at the bottom of the connecting valve; a second magnetic component is provided at the top of the extraction mechanism; the extraction mechanism is transmission-connected to the driving disk, and when the driving disk slides, the driving disk causes one of the extraction mechanisms to move relatively to just below the connecting valve.

[0009] Optionally, a sampling cavity is formed between the sampling container and the rotating disk, a first cavity connected to the sampling cavity is formed between the sampling shell, the rotating disk, the tube body and the piston column, a second cavity is formed between the sampling shell, the piston column, the tube body and the driving disk; a third cavity connected to the second cavity is formed between the driving disk, the tube body and the rotating disk; and a conductive terminal is provided on the rotating disk directly below the connecting valve;

[0010] The extraction mechanism comprises an extraction tube located in the third cavity, a heating rod arranged in the extraction tube and an extraction strip slidably sleeved on the outer wall of the heating rod; the upper end of the heating rod is connected to the upper end of the extraction tube; a first spring is arranged between the upper end of the extraction strip and the upper end of the extraction tube; the extraction strip is sealed with the inner wall of the extraction tube, so that the upper end of the extraction tube is connected with the third cavity, and the lower end of the extraction tube is connected with the sampling cavity; the first spring accommodates the extraction strip in the extraction tube; and the first magnetic component is arranged on the upper end surface of the extraction tube.

[0011] Optionally, a first track is provided on the inner wall of the extraction tube, the first track includes a first vertical groove and a first spiral groove, the upper end of the first spiral groove is connected to the lower end of the first vertical groove, and the upper end of the first vertical groove is provided with a locking groove smoothly connected to the first vertical groove; the extraction bar is convexly provided with a first pin shaft, and the first pin shaft is movably embedded in the first track; a sealing ring is provided on the outer wall of the first pin shaft; a heat expansion body is embedded in the first pin shaft, and the heat expansion body can protrude outward from the first pin shaft when its temperature reaches the deformation temperature threshold.

[0012] Optionally, a first arc groove is provided on the bottom surface of the driving disk, and two rotationally symmetrical second tracks are provided on the groove wall of the first arc groove, and the second track includes a second vertical groove and a second spiral groove; a second pin shaft is protruding from the outer wall of the extraction tube, and the second pin shaft is movably embedded in the corresponding second track.

[0013] Optionally, a third track is provided on the inner wall of the adjusting ring, a central shaft movably protruding out of the sampling housing is provided in the middle of the top surface of the driving disk, the adjusting ring is movably sleeved on the outer wall of the central shaft, a third pin is convexly provided on the outer wall of the central shaft, and the third pin is movably embedded in the third track;

[0014] The third track includes a first horizontal groove, a third spiral groove extending spirally downward, and a fourth spiral groove extending spirally upward; the two ends of the first horizontal groove are respectively connected to the upper end of the third spiral groove and the lower end of the fourth spiral groove; initially, the third pin shaft is located in the first horizontal groove.

[0015] Optionally, the lower end of the third spiral groove is connected to the second horizontal groove; the upper end of the fourth spiral groove is connected to the third horizontal groove.

[0016] Optionally, an air inlet channel is provided in both the driving disk and the central shaft, the lower end of the air inlet channel is connected to the connection valve through a hose, and the upper end of the air inlet channel is connected to the gas mass spectrometer.

[0017] Optionally, the driving disk is provided with a mounting hole connected to the first arc groove; the connecting valve includes a valve body movably inserted into the mounting hole and a second spring sleeved on the outer wall of the valve body; the two ends of the second spring are respectively abutted against the upper end surface of the driving disk and the upper end of the valve body; the valve body is connected to the third cavity.

[0018] Optionally, the rotating disk is provided with a second arc groove in the tube body, and the lower end of the extraction tube is slidably connected in the second arc groove; the conductive terminal is arranged in the second arc groove and located between the two extraction tubes.

[0019] Optionally, a fourth bayonet is protrudingly provided on the inner wall of the piston column, a fifth spiral groove is provided on the outer wall of the tube body, and the fourth bayonet is movably embedded in the fifth spiral groove.

[0020] The beneficial effects of the present invention are as follows: the present invention arranges a piston column, a rotating disk, a driving disk, and two extraction mechanisms on the rotating disk, so that the piston column moves up and down and the air pressure is used to simultaneously complete the classified extraction of the two extraction mechanisms. Then, the two extraction mechanisms are made to correspond to the positions of the connection valve and the conductive terminal respectively through the adjustment ring, so that the VOCs on the two extraction strips can be directly subjected to thermal desorption-gas chromatography detection, thereby improving the accuracy of the detection results, being simple to operate, and being conducive to avoiding the problem of secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0023] Figure 3 is a cross-sectional schematic diagram of another viewing angle of the present invention;

[0024] Figure 4 It is a partial structural schematic diagram of the present invention;

[0025] Figure 5 is an exploded schematic diagram of the extraction mechanism of the present invention;

[0026] Figure 6 is a cross-sectional schematic diagram of the extraction mechanism of the present invention;

[0027] Figure 7 yes Figure 6 A local enlarged schematic diagram of the middle A;

[0028] Figure 8 It is a schematic diagram of the structure of the drive disk of the present invention;

[0029] Fig. 9 It is a schematic structural diagram of the adjustment ring of the present invention;

[0030] Fig.10 It is a structural schematic diagram of the connection valve of the present invention;

[0031] Fig.11 It is a structural schematic diagram of the rotating disk of the present invention;

[0032] Fig.12 It is a structural schematic diagram of the piston column of the present invention;

[0033] Explanation of the reference numerals: 1. sampling shell; 2. sampling container; 21. one-way valve; 3. rotating disk; 31. tube body; 32. second arc groove; 33. conductive terminal; 34. fifth spiral groove; 4. driving disk; 41. central axis; 411. third pin shaft; 42. first arc groove; 43. second vertical groove; 44. second spiral groove; 45. air inlet channel; 46. mounting hole; 5. adjusting ring; 51. first horizontal groove; 52. third spiral groove; 53. fourth spiral groove; 54. second horizontal groove; 55. third horizontal groove; 61. extraction tube; 611. first vertical Groove; 612, first spiral groove; 613, locking groove; 614, second pin shaft; 62, heating rod; 63, extraction strip; 631, first pin shaft; 632, sealing ring; 633, thermal expansion body; 64, second magnetic member; 65, first spring; 7, piston column; 71, first ring body; 72, second ring body; 73, column; 74, fourth bayonet; 8, connecting valve; 81, valve body; 82, second spring; 83, first magnetic member; 84, hose; 9, gas phase mass spectrometer; 10, sampling chamber; 20, first cavity; 30, second cavity; 40, third cavity. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the implementation scope of the present invention is not limited thereto.

[0035] like Figures 1 to 12 As shown, a chemical wastewater VOC content detection device described in this embodiment includes a sampling shell 1, the sampling shell 1 is cylindrical, the upper end of the sampling shell 1 is a closed end, and the lower end of the sampling shell 1 is an open end;

[0036] A sampling container 2 is provided at the lower end of the sampling housing 1. The sampling container 2 is cylindrical so as to be installed in the sampling housing 1. The upper end of the sampling container 2 is an open end, and the lower end of the sampling container 2 is a closed end. A one-way valve 21 is provided at the closed end of the sampling container 2. Two one-way valves 21 are provided. The two one-way valves 21 are arranged at intervals. When the air pressure at the inner end of the sampling container 2 decreases, the one-way valve 21 can be opened to allow the sample liquid to enter the sampling container 2.

[0037] A rotating disk 3 is rotatably provided on the top of the sampling container 2, and the outer peripheral wall of the rotating disk 3 is sealed with the inner peripheral wall of the sampling housing 1, and a tube body 31 is convexly provided in the middle of the rotating disk 3; a connecting hole is penetrated through the rotating disk 3 to connect the sampling container 2 with the upper half of the sampling housing 1; a driving disk 4 is movably provided at the upper end of the tube body 31;

[0038] The upper end of the driving disk 4 passes through the sampling housing 1 upward and is movably sleeved with an adjustment ring 5 for making the driving disk 4 slide relative to the tube body 31. The user adjusts the ring 5 to make the driving disk 4 slide up and down relative to the tube body 31 in the tube body 31; the rotating disk 3 slides in the tube body 31 and is provided with two extraction mechanisms connected with the sampling container 2;

[0039] A piston column 7 is slidably disposed on the outer wall of the tube body 31 in the sampling housing 1 and is transmission-connected to the outer wall of the tube body 31; the upper end of the piston column 7 passes out of the sampling housing 1;

[0040] The piston column 7 comprises a first ring body 71, a second ring body 72 and two cylinders 73 connected between the first ring body 71 and the second ring body 72; the first ring body 71 is slidably sleeved on the outer peripheral wall of the tube body 31, the two cylinders 73 are movably penetrated through the closed end of the sampling housing 1 and then extend out, the second ring body 72 is fixedly connected to the upper ends of the two cylinders 73, and the user operates the piston column 7 through the second ring body 72 to move the piston column 7 up and down; when the piston column 7 moves up and down relative to the sampling housing 1, it can drive the rotating disk 3 to rotate;

[0041] The driving disk 4 is provided with a connecting valve 8, and the connecting valve 8 is connected with the gas phase mass spectrometer 9 through the driving disk 4; a first magnetic member 83 is provided at the bottom of the connecting valve 8; a second magnetic member 64 is provided at the top of the extraction mechanism, and the first magnetic member 83 and the second magnetic member 64 have opposite magnetic properties; the extraction mechanism is connected to the driving disk 4 in a transmission manner, and when the driving disk 4 slides, the driving disk 4 causes one of the extraction mechanisms to move relatively to the bottom of the connecting valve 8, and when the extraction mechanism moves to the bottom of the connecting valve 8, the first magnetic member 83 and the second magnetic member 64 are magnetically attracted to each other, so that the extraction mechanism is connected with the gas phase mass spectrometer 9 through the connecting valve 8. The first magnetic member 83 and the second magnetic member 64 are both permanent magnets.

[0042] Specifically, Figure 2 and Figure 3 As shown, a sampling cavity 10 is formed between the sampling container 2 and the rotating disk 3, a first cavity 20 communicating with the sampling cavity 10 is formed between the sampling housing 1, the rotating disk 3, the tube body 31 and the piston column 7, and the first cavity 20 is communicated with the sampling cavity 10 through a communicating hole; a second cavity 30 is formed between the sampling housing 1, the piston column 7, the tube body 31 and the driving disk 4; a third cavity 40 communicating with the second cavity 30 is formed between the driving disk 4, the tube body 31 and the rotating disk 3; the rotating disk 3 is provided with a conductive terminal 33 directly below the connecting valve 8;

[0043] like Figure 2 , Figure 3 , Figures 5 to 7 As shown, the extraction mechanism includes an extraction tube 61 located in the third cavity 40, a heating rod 62 arranged in the extraction tube 61, and an extraction strip 63 slidably sleeved on the outer wall of the heating rod 62; the extraction strip 63 is made of fiber material, and the corresponding fiber material is selected according to the VOC substance to be measured and extracted; the extraction strip 63 includes a disc part and a spiral part, the disc part is sealed and slidably connected in the extraction tube 61, the spiral part is connected to the disc part, and the spiral part is spirally extended around the axis of the heating rod 62; the upper end of the heating rod 62 is connected to the upper end of the extraction tube 61, and the heating rod 62 is connected to the upper end of the extraction tube 61. The lower end surface of the rod 62 is flush with the lower end surface of the extraction tube 61; a first spring 65 is provided between the upper end of the extraction bar 63 and the upper end of the extraction tube 61; the extraction bar 63 is sealed with the inner wall of the extraction tube 61, so that the upper end of the extraction tube 61 is connected with the third cavity 40, and the lower end of the extraction tube 61 is connected with the sampling cavity 10; the first spring 65 accommodates the extraction bar 63 in the extraction tube 61; the first magnetic member 83 is provided on the upper end surface of the extraction tube 61; when the piston column 7 moves upward, the extraction bar 63 overcomes the elastic force of the first spring 65 under the action of air pressure and extends downward into the sampling cavity 10.

[0044] In the actual use of the chemical wastewater VOC content detection device of this embodiment, one extraction strip 63 is coated with a polydimethylsiloxane (PDMS) coating, and the other extraction strip 63 is coated with a polyacrylate (PA) coating, which are respectively used to adsorb non-polar compounds and polar compounds; the piston rod 7 is initially at the bottom dead point position, and the user pulls the piston rod 7 upward to increase the effective volume of the first cavity 20 and the sampling cavity 10, the one-way valve 21 is opened, and the sample liquid enters the sampling cavity 10 through the one-way valve 21 until the piston rod 7 Move up to the top dead center position. During the upward movement of the piston column 7, the piston column 7 drives the rotating disk 3 to rotate, and the rotating disk 3 drives the driving disk 4 and the extraction mechanism to rotate synchronously. The driving disk 4 drives the adjusting ring 5 to rotate. At the same time, due to the gradual reduction in the volume of the second cavity 30, the gas in the second cavity 30 enters the third cavity 40, and the pressure in the third cavity 40 increases, so that the two extraction strips 63 overcome the elastic force of the first spring 65 under the action of the gas pressure, penetrate the rotating disk 3 downward, and extend into the sampling cavity 10. At this time, the extraction strips 63 are inserted into the sample liquid for extraction;

[0045] Then, the piston column 7 is pressed down, and the rotating disk 3 rotates in the opposite direction. The effective volumes of the first cavity 20 and the sampling cavity 10 are reduced, the one-way valve 21 is in a closed state, the effective volume of the second cavity 30 is increased, and the pressure of the third cavity 40 is reduced. At this time, the extraction strip 63 is retracted into the extraction tube 61 under the combined action of the air pressure and the elastic force of the first spring 65, thereby completing the extraction process;

[0046] Then, by rotating the adjusting ring 5, the driving disk 4 slides relative to the tube body 31, so that one of the extraction mechanisms moves to the right below the connecting valve 8. At this time, the corresponding second magnetic member 64 cooperates with the first magnetic member 83, so that the connecting valve 8 and the extraction tube 61 are sealed and connected, and the heating rod 62 is electrically contacted with the conductive terminal 33, so that the heating rod 62 is powered on to heat the VOC on the extraction strip 63. After heating, the VOC gas volatilizes and enters the gas mass spectrometer 9 through the connecting valve 8. The gas mass spectrometer 9 detects the VOC gas, thereby completing the thermal desorption-gas chromatography (TD-GC) detection of the VOC on the extraction strip 63 of the extraction mechanism;

[0047] Then, the adjusting ring 5 is rotated in the opposite direction to make the driving disk 4 slide in the opposite direction. The driving disk 4 moves the other extraction mechanism to the position directly below the connecting valve 8. At this time, the corresponding second magnetic member 64 cooperates with the first magnetic member 83 to seal the connecting valve 8 and the extraction tube 61. The heating rod 62 is powered on to heat the VOC on the extraction strip 63, thereby performing thermal desorption-gas chromatography (TD-GC) detection on the VOC on the extraction strip 63 of the other extraction mechanism.

[0048] In this embodiment, a piston column 7, a rotating disk 3, a driving disk 4 and two extraction mechanisms are arranged on the rotating disk 3, so that the piston column 7 moves up and down and the air pressure is used to simultaneously complete the classification extraction of the two extraction mechanisms. Then, the two extraction mechanisms are made to correspond to the positions of the connection valve 8 and the conductive terminal 33 respectively through the adjustment ring 5, so that the VOC on the two extraction strips 63 can be directly subjected to thermal desorption-gas chromatography detection, thereby improving the accuracy of the detection results, simplifying the operation, and helping to avoid secondary pollution problems.

[0049] like Figure 2 , Figures 5 to 7 As shown, in the chemical wastewater VOC content detection device of this embodiment, in some embodiments, the inner wall of the extraction tube 61 is provided with a first track, the first track includes a first vertical groove 611 and a first spiral groove 612, the upper end of the first spiral groove 612 is connected to the lower end of the first vertical groove 611, and the upper end of the first vertical groove 611 is provided with a locking groove 613 which is smoothly transitioned to the first vertical groove 611; the extraction bar 63 is protrudingly provided with a first pin shaft 631, and the first pin shaft 631 is movably embedded in the first track; the outer wall of the first pin shaft 631 is provided with a sealing ring 632; the first pin shaft 631 is embedded with a thermal expansion body 633, the thermal expansion body 633 is a memory alloy, and the thermal expansion body 633 can protrude outward from the first pin shaft 631 when its temperature reaches the deformation temperature threshold.

[0050] Specifically, initially, under the elastic force of the first spring 65, the first pin 631 is located in the locking groove 613; when the user pulls up the piston column 7, the extraction bar 63 moves downward under the action of air pressure, and the first pin 631 enters the first vertical groove 611 from the locking groove 613, and moves along the first vertical groove 611, and then enters the first spiral groove 612 from the first vertical groove 611, so that the extraction bar 63 rotates synchronously during the downward movement, so that the sample liquid in the sampling cavity 10 can be stirred to improve the uniformity of the extraction; when the piston column 7 moves upward, the extraction bar 63 moves upward and rotates synchronously, so that the excess water on the surface of the extraction bar 63 is separated under the action of centrifugation, so that the extraction is more accurate;

[0051] When the first pin shaft 631 returns to the locking groove 613, the extraction mechanism is moved to the bottom of the connecting valve 8 by adjusting the ring 5. At this time, the heating rod 62 is energized to make the VOC gas on the extraction strip 63 enter the gas phase mass spectrometer 9 through the connecting valve 8 for detection. At the same time, the temperature of the thermal expansion body 633 increases due to the heat. When the deformation temperature threshold is reached, the thermal expansion body 633 is deformed, extends into the locking groove 613 and cooperates with the locking groove 613 to unlock the extraction strip 63, so that the structure is more reliable.

[0052] like Figure 5 , Figure 6 and Figure 8 As shown, in the chemical wastewater VOC content detection device of this embodiment, in some embodiments, the bottom surface of the driving disk 4 is provided with a first arc groove 42, and the groove wall of the first arc groove 42 is provided with two rotationally symmetrical second tracks, and the second tracks include a second vertical groove 43 and a second spiral groove 44; the outer wall of the extraction tube 61 is provided with a second pin 614, and the second pin 614 is movably embedded in the corresponding second track. Initially, the second pin 614 is located at the junction of the second vertical groove 43 and the second spiral groove 44.

[0053] Specifically, when the adjusting ring 5 is rotated to move the driving disk 4 downward, the second pin 614 of one of the extraction tubes 61 moves along the corresponding second spiral groove 44, so that the second pin 614 cooperates with the second spiral groove 44 to make the extraction tube 61 slide relative to the rotating disk 3 to be directly below the connection valve 8; since the two second tracks are rotationally symmetrically arranged, the second pin 614 of the other extraction tube 61 moves along the corresponding second vertical groove 43, that is, the extraction tube 61 will not slide relative to the rotating disk 3; when the adjusting ring 5 is rotated in the opposite direction to move the driving disk 4 upward, the second pin 614 of the other extraction tube 61 enters the corresponding second spiral groove 44, so that the other extraction tube 61 slides to be directly below the connection valve 8; in this way, the VOC gases on the two extraction strips 63 are detected respectively.

[0054] like Figure 8and Fig. 9 As shown, in the chemical wastewater VOC content detection device of this embodiment, in some embodiments, the inner wall of the adjustment ring 5 is provided with a third track, the middle part of the top surface of the driving disk 4 is provided with a central shaft 41 that movably protrudes out of the sampling housing 1, the adjustment ring 5 is movably sleeved on the outer wall of the central shaft 41, and the outer wall of the central shaft 41 is convexly provided with a third pin 411, and the third pin 411 is movably embedded in the third track;

[0055] The third track includes a first horizontal groove 51, a third spiral groove 52 extending spirally downward, and a fourth spiral groove 53 extending spirally upward; the two ends of the first horizontal groove 51 are respectively connected to the upper end of the third spiral groove 52 and the lower end of the fourth spiral groove 53; initially, the third pin shaft 411 is located in the first horizontal groove 51.

[0056] Specifically, when the adjusting ring 5 is rotated, the third pin shaft 411 moves along the first horizontal groove 51 and enters the fourth spiral groove 53 from the first horizontal groove 51. At this time, the third pin shaft 411 cooperates with the fourth spiral groove 53 to move the driving disk 4 downward, so that one of the extraction tubes 61 moves to be directly below the connection valve 8. When the adjusting ring 5 is rotated in the opposite direction, the third pin shaft 411 enters the third spiral groove 52 from the first horizontal groove 51, so that the driving disk 4 moves upward, so that the other extraction tube 61 moves to be directly below the connection valve 8, thereby completing the detection of VOC gases on the two extraction strips 63.

[0057] like Fig. 9 As shown, in the chemical wastewater VOC content detection device of this embodiment, in some embodiments, the lower end of the third spiral groove 52 is connected to the second horizontal groove 54; the upper end of the fourth spiral groove 53 is connected to the third horizontal groove 55. In this embodiment, by setting the third horizontal groove 55, when the third pin 411 moves along the fourth spiral groove 53, the third pin 411 can enter the third horizontal groove 55 from the fourth spiral groove 53, so that the driving disk 4 is maintained at the current height position after the upward movement; similarly, by setting the second horizontal groove 54, the driving disk 4 is maintained at the current height position after the downward movement, so as to maintain the position of the extraction tube 61.

[0058] like Figure 2 , Figure 3 and Figure 8As shown, in the chemical wastewater VOC content detection device of this embodiment, in some implementations, the driving disk 4 and the central shaft 41 are both provided with an air inlet channel 45, the lower end of the air inlet channel 45 is connected to the connection valve 8 through a hose 84, and the upper end of the air inlet channel 45 is connected to the gas phase mass spectrometer 9. In this embodiment, by providing an inlet channel, when the extraction tube 61 moves to the bottom of the connection valve 8, the extraction tube 61 is sealed and connected to the connection valve 8, and the VOC gas in the extraction tube 61 enters the air inlet channel 45 through the connection valve 8, and then enters the gas phase mass spectrometer 9 for detection.

[0059] like Figure 3 , Figure 8 and Fig.10 As shown, in the chemical wastewater VOC content detection device of this embodiment, in some implementations, the drive disk 4 is provided with a mounting hole 46 connected to the first arc groove 42 to facilitate the installation of the connecting valve 8; the connecting valve 8 includes a valve body 81 movably inserted into the mounting hole 46 and a second spring 82 sleeved on the outer wall of the valve body 81; the two ends of the second spring 82 are respectively abutted against the upper end surface of the drive disk 4 and the upper end of the valve body 81; the valve body 81 is connected to the third cavity 40.

[0060] Specifically, the valve body 81 is in the top dead center position under the action of the second elastic force. When the extraction tube 61 is located directly below the valve body 81, with the cooperation of the first magnetic part 83 and the second magnetic part 64, the valve body 81 overcomes the elastic force of the second spring 82 and moves downward, so that the lower end face of the valve body 81 is sealed against the upper end face of the extraction tube 61, thereby making the valve body 81 and the extraction tube 61 sealed and connected, so that the VOC gas in the extraction tube 61 passes through the valve body 81, the hose 84 and the air inlet channel 45 and enters the gas mass spectrometer 9 for detection.

[0061] like Figure 2 , Figure 3 and Fig.11 As shown, in the chemical wastewater VOC content detection device of this embodiment, in some embodiments, the rotating disk 3 is provided with a second arc groove 32 in the tube body 31, and the lower end of the extraction tube 61 is slidably connected in the second arc groove 32; the conductive terminal 33 is provided in the second arc groove 32 and is located between the two extraction tubes 61. In this embodiment, the second arc groove 32 is provided to facilitate the installation of the extraction mechanism. When the driving disk 4 moves up and down, the driving disk 4 cooperates with the third spiral groove 52 and the fourth spiral groove 53 through the third pin 411, so that the extraction tube 61 moves along the track of the second arc groove 32, so as to ensure that the extraction tube 61 reliably moves to the position corresponding to the conductive terminal 33, so that the heating rod 62 and the conductive terminal 33 are electrically contacted and connected, so as to perform thermal desorption-gas chromatography detection on the VOC on the extraction strip 63.

[0062] like Figures 2 to 4 , Fig.11 and Fig.12 As shown, in the chemical wastewater VOC content detection device of this embodiment, in some implementations, the inner wall of the piston column 7 is convexly provided with a fourth bayonet 74, the outer wall of the tube body 31 is provided with a fifth spiral groove 34, and the fourth bayonet 74 is movably embedded in the fifth spiral groove 34. In this embodiment, the fourth bayonet 74 is provided to cooperate with the fifth spiral groove 34, so that during the up and down movement of the piston column 7, the fourth bayonet 74 cooperates with the fifth spiral groove 34 to make the rotating disk 3 rotate, so as to complete the extraction of the sample liquid by the two extraction strips 63.

[0063] The above is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the protection scope of the patent application of the present invention.

Claims

1. A chemical wastewater VOC content detection device, characterized in that: It comprises a sampling shell, a sampling container is arranged at the lower end of the sampling shell, a rotating disk is rotatably arranged at the top of the sampling container, and a tube body is arranged in the middle of the rotating disk; a driving disk is movably arranged at the upper end of the tube body, the upper end of the driving disk passes upward through the sampling shell and is movably sleeved with an adjusting ring for making the driving disk slide relative to the tube body; the rotating disk is slidably arranged in the tube body and is provided with two extraction mechanisms connected with the sampling container; A piston column is provided inside the sampling shell and is slidably disposed on the outer wall of the tube body and is transmission-connected to the outer wall of the tube body. The upper end of the piston column passes out of the sampling shell. When the piston column moves up and down relative to the sampling shell, it can drive the rotating disk to rotate. The driving disk is provided with a connecting valve, which is connected to the gas phase mass spectrometer through the driving disk; a first magnetic component is provided at the bottom of the connecting valve; a second magnetic component is provided at the top of the extraction mechanism; the extraction mechanism is transmission-connected to the driving disk, and when the driving disk slides, the driving disk causes one of the extraction mechanisms to move relatively to just below the connecting valve.

2. A chemical wastewater VOC content detection device according to claim 1, characterized in that: A sampling cavity is formed between the sampling container and the rotating disk; a first cavity connected to the sampling cavity is formed between the sampling shell, the rotating disk, the tube body and the piston column; a second cavity is formed between the sampling shell, the piston column, the tube body and the driving disk; a third cavity connected to the second cavity is formed between the driving disk, the tube body and the rotating disk; the rotating disk is provided with a conductive terminal directly below the connecting valve; The extraction mechanism comprises an extraction tube located in the third cavity, a heating rod arranged in the extraction tube and an extraction strip slidably sleeved on the outer wall of the heating rod; the upper end of the heating rod is connected to the upper end of the extraction tube; a first spring is arranged between the upper end of the extraction strip and the upper end of the extraction tube; the extraction strip is sealed with the inner wall of the extraction tube, so that the upper end of the extraction tube is connected with the third cavity, and the lower end of the extraction tube is connected with the sampling cavity; the first spring accommodates the extraction strip in the extraction tube; and the first magnetic component is arranged on the upper end surface of the extraction tube.

3. A chemical wastewater VOC content detection device according to claim 2, characterized in that: A first track is provided on the inner wall of the extraction tube, and the first track includes a first vertical groove and a first spiral groove. The upper end of the first spiral groove is connected to the lower end of the first vertical groove, and the upper end of the first vertical groove is provided with a locking groove smoothly transitioned to the first vertical groove; a first pin shaft is convexly provided on the extraction bar, and the first pin shaft is movably embedded in the first track; a sealing ring is sleeved on the outer wall of the first pin shaft; a thermal expansion body is embedded in the first pin shaft, and the thermal expansion body can protrude outward from the first pin shaft when its temperature reaches the deformation temperature threshold.

4. A chemical wastewater VOC content detection device according to claim 2, characterized in that: A first arc groove is arranged on the bottom surface of the driving disk, and two rotationally symmetrical second tracks are arranged on the groove wall of the first arc groove, and the second track includes a second vertical groove and a second spiral groove; a second pin shaft is convexly arranged on the outer wall of the extraction tube, and the second pin shaft is movably embedded in the corresponding second track.

5. A chemical wastewater VOC content detection device according to claim 4, characterized in that: The inner wall of the adjusting ring is provided with a third track, the middle part of the top surface of the driving disk is provided with a central shaft movably protruding out of the sampling housing, the adjusting ring is movably sleeved on the outer wall of the central shaft, the outer wall of the central shaft is convexly provided with a third pin shaft, and the third pin shaft is movably embedded in the third track; The third track includes a first horizontal groove, a third spiral groove extending spirally downward, and a fourth spiral groove extending spirally upward; the two ends of the first horizontal groove are respectively connected to the upper end of the third spiral groove and the lower end of the fourth spiral groove; initially, the third pin shaft is located in the first horizontal groove.

6. A chemical wastewater VOC content detection device according to claim 5, characterized in that: The lower end of the third spiral groove is connected to the second horizontal groove; the upper end of the fourth spiral groove is connected to the third horizontal groove.

7. A chemical wastewater VOC content detection device according to claim 5, characterized in that: An air inlet channel is provided in both the driving disk and the central shaft. The lower end of the air inlet channel is connected to the connecting valve through a hose, and the upper end of the air inlet channel is connected to the gas phase mass spectrometer.

8. A chemical wastewater VOC content detection device according to claim 7, characterized in that: The driving disk is provided with a mounting hole connected with the first arc groove; the connecting valve comprises a valve body movably arranged in the mounting hole and a second spring sleeved on the outer wall of the valve body; the two ends of the second spring are respectively in contact with the upper end surface of the driving disk and the upper end of the valve body; the valve body is connected with the third cavity.

9. A chemical wastewater VOC content detection device according to claim 2, characterized in that: The rotating disk is provided with a second arc groove in the tube body, and the lower end of the extraction tube is slidably connected in the second arc groove; the conductive terminal is arranged in the second arc groove and located between the two extraction tubes.

10. A chemical wastewater VOC content detection device according to claim 1, characterized in that: A fourth bayonet is convexly arranged on the inner wall of the piston column, a fifth spiral groove is arranged on the outer wall of the tube body, and the fourth bayonet is movably embedded in the fifth spiral groove.

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