A volatile organic compound sampling and detection device

Abstract

The present invention discloses a volatile organic compound sampling and detection device, which comprises a ground moving seat, a rotorcraft, a sampler and a cable winch. The sampler is installed on the rotorcraft. The sampler comprises an air intake box. A filter screen is arranged at the air inlet of the air intake box, and a cleaning mechanism is arranged at the filter screen. The air intake box is connected with a sampling box and a detection box in sequence. The cable winch is movably arranged on the ground moving seat through a displacement compensation mechanism. A cable is wound around the cable winch. Both ends of the cable are electrically connected with the rotorcraft and a power supply, respectively. In this scheme, the sampler is installed on the rotorcraft, so that the sampler can realize high-altitude precise positioning sampling and detection. The power supply can continuously supply power to the rotorcraft through the cable, so that the rotorcraft can perform long-term high-altitude and low-altitude flight and hovering, thereby realizing long-term continuous or intermittent sampling of the sampler at the sampling position, and improving the accuracy of sampling and detection.

Description

Technical Field

[0001] The invention relates to the technical field of environmental gas sampling and detection, and in particular to a volatile organic compound sampling and detection device. Background Art

[0002] Volatile organic compounds, commonly referred to as VOCs, refer to organic compounds with a saturated vapor pressure greater than 70Pa at room temperature and a boiling point below 260°C at normal pressure, or all organic compounds with a vapor pressure greater than or equal to 10Pa at 20°C and are volatile. They not only have a special unpleasant odor, but are also toxic, irritating, teratogenic and carcinogenic. Therefore, the detection of volatile organic compounds in the environment is very necessary.

[0003] The detection of volatile organic compounds in the air is an important indicator of environmental monitoring. It is often measured directly outdoors using a portable sampling and detection device. Since impurities suspended in the air can easily clog the air inlet of the sampling and detection device, it is necessary to initially filter out atmospheric impurities, but not the objects to be detected. This can be achieved by selecting a sparser large-pore filter. However, the current sampling and detection device cannot clean the filter in a timely manner, resulting in a decrease in detection accuracy after the device has been running for a period of time.

[0004] At the same time, when the volatile organic compound collection and monitoring devices in the prior art are sampling, most of them can only collect environmental gases at the same level, but cannot collect and mix environmental gases at different levels, so that the detection results of the obtained environmental gas samples are generally inaccurate.

[0005] In addition, when collecting volatile organic compounds at high altitudes, the sampling and detection device needs to be installed on the aircraft and sampling is carried out using the airflow during flight. The collected samples can only represent the average value of a relatively large area and cannot be used to more accurately analyze the distribution of particulate matter concentration in the area. Compared with traditional aircraft, small multi-rotor aircraft can serve as an ideal carrying platform for sampling and detection devices, but due to the limitations of existing technologies in battery energy storage, the weight is too large and the flight time is short. Ordinary small multi-rotor aircraft are subject to certain limitations in conducting more in-depth research on the characteristics and laws of volatile organic compound pollution. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a volatile organic compound sampling and detection device, which solves the problems of poor sampling and detection accuracy and difficulty in achieving long-term high-altitude sampling in the prior art sampling and detection devices.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is:

[0008] A volatile organic compound sampling and detection device is provided, which comprises a ground moving seat, a rotorcraft, a sampler and a cable winch. The sampler is installed on the rotorcraft. The sampler comprises an air intake box. A filter is arranged at the air inlet of the air intake box, and a cleaning mechanism for removing impurities is arranged at the filter. The air intake box is connected with a sampling box and a detection box in sequence. The cable winch is movably arranged on the ground moving seat through a displacement compensation mechanism. A cable is wound around the cable winch. Both ends of the cable are electrically connected to the rotorcraft and a power supply, respectively.

[0009] The beneficial effects of adopting the above technical scheme are as follows: this scheme installs the sampler on the rotorcraft, and utilizes the flight and hovering positioning functions of the rotorcraft to enable the sampler to achieve high-altitude precise positioning sampling and detection; the power supply can continuously power the rotorcraft through the cable, so that the rotorcraft can perform long-term high and low altitude flight and hovering, thereby achieving long-term continuous or intermittent sampling of the sampler at the sampling position, improving the accuracy of sampling detection, and facilitating in-depth research on the characteristics and laws of volatile organic compound pollution; at the same time, large particles of impurities in the air can be filtered through the filter, thereby achieving accurate detection of volatile organic compounds in the air, and a cleaning mechanism is set at the filter to achieve timely cleaning of the filter, so as to facilitate long-term operation of the sampler.

[0010] Furthermore, a turntable is rotatably arranged at the bottom of the rotorcraft, and an avoidance hole is arranged in the middle of the turntable to facilitate the passage of cables. The air intake box, sampling box and detection box are all arranged on the turntable. A vertical fixed wind wing is arranged on the turntable, and the fixed wind wing and the air intake box are respectively arranged on both sides of the turntable, and the air inlet is arranged on the side of the air intake box away from the fixed wind wing.

[0011] The beneficial effects of adopting the above technical solution are: the air intake box can be freely rotated in the horizontal direction through the turntable, and under the action of wind, the wing surface of the fixed wind wing can automatically deflect and be parallel to the wind direction, so that the air inlet of the air intake box is directly facing the wind direction, thereby utilizing the natural wind speed to sample volatile organic compounds in the air, thereby eliminating the weight of the air pump required for the sampler to collect gas, thereby reducing the load and energy consumption of the rotorcraft.

[0012] Furthermore, the cleaning mechanism includes a brush rod movably arranged at the filter screen, guide rails are arranged on both sides of the filter screen, the brush rod is provided with guide wheels slidably matched with the two guide rails, a conveyor belt parallel to the guide rails is arranged on the air intake box, the conveyor belt is connected to the cleaning motor by transmission, a connecting rod is arranged at one end of the brush rod, a strip groove is opened in the extension direction of the connecting rod, and a driving wheel slidably matched with the strip groove is arranged on one side of the conveyor belt.

[0013] The beneficial effects of adopting the above technical scheme are as follows: this scheme drives the conveyor belt to move through the cleaning motor, and drives the driving wheel on one side of the conveyor belt to perform closed-loop reciprocating motion along the trajectory of the conveyor belt, and the driving wheel can drive the brush rod to slide back and forth along the guide rail, thereby realizing reciprocating cleaning of the filter screen. At the same time, the strip groove on the connecting rod can provide avoidance space for the displacement difference of the driving wheel in the vertical direction of the conveyor belt.

[0014] Furthermore, the displacement compensation mechanism includes a forward threaded rod and a reverse threaded rod, one end of the forward threaded rod and the reverse threaded rod are rotatably connected by a connecting piece, and the other ends of the forward threaded rod and the reverse threaded rod are respectively limited on two bearing seats, the cable winch is movably sleeved on the forward threaded rod and the reverse threaded rod, and the two ends of the cable winch are respectively threadedly matched with the forward threaded rod and the reverse threaded rod, the cable winch is transmission-connected to the driving mechanism, a bearing frame is arranged above the two bearing seats, and a wire guide for facilitating cable retraction and release is arranged in the middle of the bearing frame, the end faces of the forward threaded rod and the reverse threaded rod are both provided with first end face gears, and the outer sides of the two bearing seats are provided with stopping mechanisms respectively matched with the two first end face gears.

[0015] The beneficial effects of adopting the above technical scheme are as follows: this scheme can realize the retraction and release of the cable through the forward and reverse cable winch, so that the cable can adapt to the different flight altitudes of the rotorcraft and provide continuous power for it; at the same time, the forward threaded rod and the reverse threaded rod can be alternately locked by the locking mechanism, and the cable winch can be driven to move back and forth in the axial direction while performing forward and reverse rotation, so that the outlet tangent point of the cable wound on the cable winch is always on the same vertical line as the wire tangent point of the wire guide. This arrangement greatly improves the stability of the cable during retraction and release, and makes the cable wound on the cable winch flat and orderly, avoiding the situation where the cable falls off the cable winch, which is conducive to the stable retraction and release of long cables, and then helps to increase the flight altitude of the rotorcraft.

[0016] Furthermore, the stopping mechanism includes a plurality of guide columns extending toward the outside of the bearing seat, a plurality of guide columns are provided with movable blocks on movable sleeves, a plurality of guide columns are provided with electromagnets on fixed sleeves at one end close to the bearing seat, a plurality of guide columns are provided with stop blocks at one end away from the bearing seat, the stop blocks and the electromagnets are connected by a reset spring, a permanent magnet is provided in the movable block, and a second end face gear matching the first end face gear is provided at one end of the movable block close to the bearing seat.

[0017] The beneficial effects of adopting the above technical scheme are as follows: the electromagnet energized in this scheme can attract the permanent magnet and drive the moving block to slide along the guide column until it is in adsorption contact with the electromagnet. At this time, the second end face gear on the moving block is meshed with the first end face gear, thereby locking the forward threaded rod or the reverse threaded rod to prevent it from rotating. The locked forward threaded rod or the reverse threaded rod can drive the rotating cable winch to undergo axial displacement, while the unlocked forward threaded rod or the reverse threaded rod can rotate freely under the push of the cable winch.

[0018] Furthermore, triggers are provided on the inner sides of the two bearing seats, the two electromagnets are electrically connected to the control power supply through a single-pole double-throw switch, and the single-pole double-throw switch is electrically connected to the two triggers through a controller.

[0019] The beneficial effects of adopting the above technical scheme are as follows: this scheme can control the path switching of the single-pole double-throw switch through a trigger, thereby controlling the alternating on and off of the two electromagnets, and the two triggers are respectively arranged on the inner sides of the two bearing seats, so that when the cable winch moves axially in the positive direction and approaches one of the bearing seats, the trigger sends a signal to alternate the on and off conditions of the two electromagnets, and the locking conditions of the forward threaded rod and the reverse threaded rod also alternate, thereby causing the cable winch to move axially in the reverse direction, and then causing the cable winch to gradually approach the other bearing seat, and so on and so forth, so that the cable winch can realize axial reciprocating displacement while rotating.

[0020] Furthermore, the connecting member includes a sleeve and a connecting sleeve which are respectively fixedly connected to the end of the forward threaded rod and the end of the reverse threaded rod, a bearing is arranged in the sleeve, and the outer wall of the connecting sleeve is rotatably connected to the inner wall of the sleeve through the bearing.

[0021] The beneficial effect of adopting the above technical solution is that while the solution realizes the rotational connection between the forward threaded rod and the reverse threaded rod through the connecting piece, the connecting piece has a strong load capacity, thereby improving the bending resistance of the connection between the forward threaded rod and the reverse threaded rod.

[0022] Furthermore, the driving mechanism includes a columnar gear and a driving motor, the columnar gear is located below the cable winch, the driving motor is transmission-connected to one end of the columnar gear, and one end of the cable winch is provided with a driven gear meshing with the columnar gear.

[0023] The beneficial effects of adopting the above technical solution are as follows: the solution can drive the cable winch to rotate forward and reverse through the driving motor, and when the cable winch undergoes axial displacement, the driven gear can always be in transmission meshing with the columnar gear.

[0024] Furthermore, a conductive slip ring is provided at one end of the cable winch away from the driven gear, one end of the cable is electrically connected to the rotating part of the conductive slip ring, the fixed part of the conductive slip ring is in sliding contact with the conductive rod, the conductive rod is electrically connected to the power supply, and the axial dimensions of the columnar gear and the conductive rod are not less than the axial movement stroke of the cable winch.

[0025] The beneficial effect of adopting the above technical solution is that under the conductive cooperation of the conductive slip ring and the conductive rod, the cable on the cable winch can always be electrically connected to the power supply, so that the cable can continuously supply power to the rotorcraft during the retraction and release process.

[0026] Furthermore, the wire guide includes a rectangular frame, in which two parallel wire wheels with a gap are arranged, an annular groove is arranged in the middle of the outer wall of the wire wheel, and the cable passes through the annular groove between the two wire wheels. The radial dimension of the cable is greater than the spacing between the two wire wheels, and the radial dimension of the cable is smaller than the spacing between the two annular grooves.

[0027] The beneficial effects of adopting the above technical solution are: the wire guide of this solution can limit the entry point and exit point of the cable when it is retracted and released, and the wire wheel can prevent the surface of the cable from rubbing against the rectangular frame when the cable is retracted and released, thereby providing a guarantee for stable and reliable retraction and release of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a volatile organic compound sampling and detection device.

[0029] Figure 2 for Figure 1 Schematic diagram of the cable retracting and releasing line status when the positive threaded rod is locked.

[0030] Figure 3 This is a schematic diagram of the structure of the air intake box.

[0031] Figure 4 This is the end view of the air intake box.

[0032] Figure 5 for Figure 1 Schematic diagram of the structure of area A in the middle.

[0033] Figure 6 This is the connection circuit diagram of the electromagnet, trigger and control power supply.

[0034] Figure 7 A schematic diagram of the structure of the connector.

[0035] Figure 8 A top view of the wire guide.

[0036] Among them, 1. ground mobile seat, 2. rotorcraft, 3. cable winch, 4. air intake box, 5. air inlet, 6. sampling box, 7. detection box, 8. cable, 9. power supply, 10. turntable, 11. avoidance hole, 12. fixed wind wing, 13. filter, 14. brush rod, 15. guide rail, 16. conveyor belt, 17. cleaning motor, 18. connecting rod, 19. strip groove, 20. driving wheel, 21. forward threaded rod, 22. reverse threaded rod, 23. connecting piece, 24. bearing seat, 25. bearing frame, 26. wire guide, 27. First end face gear, 28. Stop mechanism, 29. Guide column, 30. Moving block, 31. Electromagnet, 32. Stop block, 33. Second end face gear, 34. Trigger, 35. Single-pole double-throw switch, 36. Control power supply, 37. Sleeve, 38. Connecting cylinder, 39. Bearing, 40. Columnar gear, 41. Driving motor, 42. Driven gear, 43. Conductive slip ring, 44. Rotating part, 45. Fixed part, 46. Conductive rod, 47. Rectangular frame, 48. Wire pulley, 49. Annular groove, 50. Return spring. DETAILED DESCRIPTION

[0037] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0038] Example 1

[0039] like Figure 1 and Figure 2 As shown, the volatile organic compound sampling and detection device of the present scheme includes a ground mobile base 1, a rotorcraft 2, a sampler and a cable winch 3, wherein the ground mobile base 1 can be an intelligent mobile platform that can be remotely controlled or a manually driven mobile vehicle, the sampler is installed on the rotorcraft 2, and a GPS locator is installed in the rotorcraft 2 to facilitate the sampler to reach the sampling position, and the flight and hovering positioning functions of the rotorcraft 2 are utilized to enable the sampler to achieve high-altitude precise positioning sampling and detection.

[0040] The sampler includes an air intake box 4, a filter 13 is provided at the air inlet 5 of the air intake box 4, and a cleaning mechanism is provided at the filter 13. The large particle impurities in the air can be filtered through the filter 13, so as to achieve accurate detection of volatile organic compounds in the air, and the filter 13 can be cleaned in time through the cleaning mechanism to facilitate long-term operation of the sampler.

[0041] The air intake box 4 is connected to the sampling box 6 and the detection box 7 in sequence, wherein the sampling box 6 is used to collect the sampled air, and the detection box 7 is used to detect volatile organic compounds in the sampled air. Preferably, the detection box 7 may include a processor, a GC-FID analyzer, a data acquisition and processing controller, a wireless signal sending module, etc., so as to analyze and process the data and transmit the data processing results to the ground receiving end.

[0042] The cable winch 3 is movably arranged on the ground movable seat 1 through a displacement compensation mechanism, and a cable 8 is wound around the cable winch 3. The two ends of the cable 8 are electrically connected to the rotorcraft 2 and the power supply 9 respectively; the power supply 9 can continuously supply power to the rotorcraft 2 through the cable 8, so that the rotorcraft 2 can perform long-term high and low altitude flight and hovering, thereby realizing long-term continuous or intermittent sampling of the sampler at the sampling position, improving the accuracy of sampling detection, and facilitating in-depth research on the characteristics and laws of volatile organic compound pollution.

[0043] Example 2

[0044] like Figure 1 As shown, this embodiment is a further limitation made on the basis of Embodiment 1, a turntable 10 is rotatably provided at the bottom of the rotorcraft 2, a avoidance hole 11 is provided in the middle of the turntable 10 for facilitating the passage of the cable 8, the air inlet box 4, the sampling box 6 and the detection box 7 are all arranged on the turntable 10, a vertical fixed wind wing 12 is provided on the turntable 10, and the fixed wind wing 12 and the air inlet box 4 are respectively arranged on both sides of the turntable 10, and the air inlet 5 is arranged on the side of the air inlet box 4 away from the fixed wind wing 12; the turntable 10 can make the air inlet box 4 rotate freely in the horizontal direction, and under the action of high-altitude wind force, the wing surface of the fixed wind wing 12 can automatically deflect and be parallel to the wind direction, so that the air inlet 5 of the air inlet box 4 is directly opposite to the wind direction, so that the natural wind speed is used to sample the volatile organic compounds in the air, thereby eliminating the weight of the air pump required for the sampler to collect gas, thereby reducing the load and energy consumption of the rotorcraft 2.

[0045] In particular, when the present scheme is used for sampling and detection at low altitude or in an environment with weak wind, an air pump may be pre-installed on the connecting pipe between the air inlet box 4 and the sampling box 6 according to actual conditions to facilitate air collection.

[0046] Example 3

[0047] like Figure 3 and Figure 4As shown, based on Example 1, this embodiment provides a specific scheme of the cleaning mechanism, the cleaning mechanism includes a brush rod 14 movably arranged at the filter screen 13, wherein the filter screen 13 is rectangular, the length of the brush rod 14 is adapted to the width of the filter screen 13, guide rails 15 are arranged on both sides of the length direction of the filter screen 13, the brush rod 14 is provided with guide wheels respectively slidingly matched with the two guide rails 15, a conveyor belt 16 parallel to the guide rail 15 is arranged on the air intake box 4, the conveyor belt 16 is transmission-connected to the cleaning motor 17, and a connecting rod 18 is arranged at one end of the brush rod 14, A strip groove 19 is provided in the extension direction of the connecting rod 18, and a driving wheel 20 that slides with the strip groove 19 is provided on one side of the conveyor belt 16; the conveyor belt 16 is driven to move by the cleaning motor 17, and the driving wheel 20 on one side of the conveyor belt 16 is driven to perform closed-loop reciprocating motion along the trajectory of the conveyor belt 16, and the driving wheel 20 can drive the brush rod 14 to slide back and forth along the guide rail 15, thereby realizing reciprocating cleaning of the filter 13, and at the same time, the strip groove 19 on the connecting rod 18 can provide avoidance space for the displacement difference of the driving wheel 20 in the vertical direction of the conveyor belt 16.

[0048] Example 4

[0049] like Figure 1 and Figure 2 As shown, based on Example 1, this embodiment provides a specific scheme of the displacement compensation mechanism, which includes a forward threaded rod 21 and a reverse threaded rod 22. One end of the forward threaded rod 21 and the reverse threaded rod 22 are rotatably connected by a connecting piece 23, so that there is no rotational constraint between the forward threaded rod 21 and the reverse threaded rod 22; the other ends of the forward threaded rod 21 and the reverse threaded rod 22 are respectively limited on two bearing seats 24, so that the forward threaded rod 21 and the reverse threaded rod 22 can rotate on the two bearing seats 24 respectively, but cannot move axially.

[0050] The cable winch 3 is movably sleeved on the forward threaded rod 21 and the reverse threaded rod 22, and the two ends of the cable winch 3 are respectively threadedly matched with the forward threaded rod 21 and the reverse threaded rod 22, and the cable winch 3 is transmission-connected with the driving mechanism; a carrier frame 25 is arranged above the two bearing seats 24, and the carrier frame 25 can be used to carry the rotorcraft 2, and a wire guide 26 is arranged in the middle of the carrier frame 25 for facilitating the retraction and release of the cable 8, and the end faces of the forward threaded rod 21 and the reverse threaded rod 22 are both provided with first end face gears 27, and the outer sides of the two bearing seats 24 are provided with stopping mechanisms 28 respectively matched with the two first end face gears 27.

[0051] The present solution can realize the retraction and release of the cable 8 by driving the cable winch 3 forward and reversely by the driving mechanism, so that the cable 8 can adapt to the different flight altitudes of the rotorcraft 2 and provide continuous power for it; at the same time, the forward threaded rod 21 and the reverse threaded rod 22 can be alternately locked by the locking mechanism 28, and the cable winch 3 can be driven to move back and forth in the axial direction while performing forward and reverse rotation, so that the outlet tangent point of the cable 8 wound on the cable winch 3 is always on the same vertical line as the wire tangent point of the wire guide 26. This arrangement greatly improves the stability of the cable 8 when it is retracted and released, and makes the cable 8 wound on the cable winch 3 smoothly and orderly, avoiding the situation where the cable 8 falls off the cable winch 3, which is beneficial to the stable retraction and release of the long cable 8, and further beneficial to improving the flight altitude of the rotorcraft 2.

[0052] Example 5

[0053] like Figure 1 , Figure 5 and Figure 6 As shown, on the basis of Example 4, this embodiment provides a specific scheme of the stop mechanism 28, and the stop mechanism 28 includes four guide pillars 29 extending toward the outside of the bearing seat 24, the guide pillars 29 are parallel to the forward threaded rod 21 and the reverse threaded rod 22, and a movable sleeve is provided with a moving block 30 on the four guide pillars 29, and an electromagnet 31 is fixedly provided at one end of the four guide pillars 29 close to the bearing seat 24, and a stopper 32 is provided at one end of the four guide pillars 29 away from the bearing seat 24 to prevent the moving block 30 from sliding off the four guide pillars 29, and the stopper 32 is connected to the electromagnet 31 by a reset spring 50, and a permanent magnet is provided in the moving block 30, and a second end face gear 33 matching the first end face gear 27 is provided at one end of the moving block 30 close to the bearing seat 24.

[0054] A trigger 34 is provided on the inner side of the two bearing seats 24 . The two electromagnets 31 are electrically connected to a control power supply 36 via a single-pole double-throw switch 35 . The single-pole double-throw switch 35 is electrically connected to the two triggers 34 via a controller.

[0055] The principle of axial displacement of the cable winch 3 of the present scheme is as follows: by energizing the electromagnet 31, the electromagnet 31 attracts the permanent magnet, and drives the moving block 30 to slide along the guide column 29 until it is in adsorption contact with the electromagnet 31. At this time, the second end face gear 33 on the moving block 30 is meshed with the first end face gear 27, so that the second end face gear 33 locks the first end face gear 27, thereby locking the forward threaded rod 21 or the reverse threaded rod 22 to prevent it from rotating. The locked forward threaded rod 21 or the reverse threaded rod 22 can drive the rotating cable winch 3 to axially displace, and the unlocked forward threaded rod 21 or the reverse threaded rod 22 can rotate freely under the push of the cable winch 3, so that it does not hinder the axial displacement of the cable winch 3.

[0056] The principle of the reciprocating displacement of the cable winch 3 in the axial direction of the present scheme is as follows: the present scheme can control the path switching of the single-pole double-throw switch 35 through the trigger 34, thereby controlling the alternating on and off of the two electromagnets 31, and the two triggers 34 are respectively arranged on the inner sides of the two bearing seats 24, so that when the cable winch 3 moves axially in the positive direction and approaches one of the bearing seats 24, the trigger 34 sends a signal to alternate the on and off conditions of the two electromagnets 31, and the locking conditions of the forward threaded rod 21 and the reverse threaded rod 22 also alternate, so that the cable winch 3 moves axially in the reverse direction, and then the cable winch 3 gradually approaches the other bearing seat 24, and so on and so forth, so that the cable winch 3 can realize axial reciprocating displacement while rotating.

[0057] Example 6

[0058] like Figure 7 As shown, this embodiment, based on Embodiment 4, provides a specific scheme of the connecting member 23, wherein the connecting member 23 includes a sleeve 37 and a connecting tube 38 which are respectively fixedly connected to the end of the forward threaded rod 21 and the end of the reverse threaded rod 22, a bearing 39 is arranged in the sleeve 37, and the outer wall of the connecting tube 38 is rotatably connected to the inner wall of the sleeve 37 via the bearing 39; wherein the connecting member 23 has a strong load capacity, thereby improving the bending resistance of the connection between the forward threaded rod 21 and the reverse threaded rod 22.

[0059] Example 7

[0060] like Figure 1 As shown, this embodiment, based on the embodiment 4, provides a specific scheme of the driving mechanism, the driving mechanism includes a columnar gear 40 and a driving motor 41, the columnar gear 40 is located below the cable winch 3, the driving motor 41 is transmission-connected to one end of the columnar gear 40, and one end of the cable winch 3 is provided with a driven gear 42 meshing with the columnar gear 40; in this scheme, the driving motor 41 can drive the cable winch 3 to rotate forward and reverse, and when the cable winch 3 undergoes axial displacement, the driven gear 42 can always be transmission-engaged with the columnar gear 40.

[0061] In particular, the driving motor 41 of the present solution may preferably be a variable frequency speed regulating motor, which realizes speed control of the axial reciprocating displacement of the cable winch 3 by the variable frequency speed regulating motor through frequency control and adjustment. In specific implementation, as shown in the figure, when the speed of the variable frequency speed regulating motor is at the maximum value, the cable winch 3 is located in the middle of the two bearing seats 24, and when the speed of the variable frequency speed regulating motor is at the minimum value (equal to zero), the cable winch 3 is close to one of the bearing seats 24, and just causes the trigger 34 to trigger the signal; this setting makes the locking condition of the forward threaded rod 21 and the reverse threaded rod 22 in the triggering state. When the rotation of the threaded rod to be locked is alternating, the rotation speed of the threaded rod to be locked (one of the forward threaded rod 21 and the reverse threaded rod 22) will gradually drop to zero, so as to facilitate the matching locking of the first end face gear 27 and the second end face gear 33, thereby avoiding severe wear of the first end face gear 27 and the second end face gear 33 due to forced locking of the second end face gear 33 with the rotating first end face gear 27, which in turn leads to the first end face gear 27 and the second end face gear 33 having a short service life and being easy to damage; at the same time, it also avoids the extrusion wear between the components caused by the inertia during the axial reversing displacement of the cable winch 3.

[0062] Example 8

[0063] like Figure 1 As shown, this embodiment is a further limitation made on the basis of Embodiment 7, in which a conductive slip ring 43 is provided at one end of the cable winch 3 away from the driven gear 42, one end of the cable 8 is electrically connected to the rotating portion 44 of the conductive slip ring 43, the fixed portion 45 of the conductive slip ring 43 is in sliding contact with the conductive rod 46, the conductive rod 46 is electrically connected to the power supply 9, and the axial dimensions of the columnar gear 40 and the conductive rod 46 are not less than the axial movement stroke of the cable winch 3; in this scheme, under the conductive cooperation of the conductive slip ring 43 and the conductive rod 46, the cable 8 on the cable winch 3 can always be electrically connected to the power supply 9, so that the cable 8 can continuously supply power to the rotorcraft 2 during the retraction and extension process.

[0064] Example 9

[0065] like Figure 8As shown, this embodiment is based on the embodiment 4 and provides a specific scheme of the wire guide 26. The wire guide 26 includes a rectangular frame 47. Two parallel wire wheels 48 are arranged with a gap in the rectangular frame 47. An annular groove 49 is arranged in the middle of the outer wall of the wire wheel 48. The cable 8 passes through the annular groove 49 between the two wire wheels 48. The radial dimension of the cable 8 is greater than the spacing between the two wire wheels 48, and the radial dimension of the cable 8 is smaller than the spacing between the two annular grooves 49, so that the cable 8 can be limited in the annular groove 49 between the two wire wheels 48, thereby realizing the limitation of the cable entry point and the cable exit point when the cable 8 is retracted. At the same time, the wire wheel 48 can prevent the surface of the cable 8 from rubbing against the rectangular frame 47 when the cable 8 is retracted, thereby providing a guarantee for the stable and reliable retraction of the cable 8.

Claims

1. A volatile organic compound sampling and detection device, characterized in that: The invention comprises a ground movable seat (1), a rotorcraft (2), a sampler and a cable winch (3), wherein the sampler is mounted on the rotorcraft (2), the sampler comprises an air intake box (4), a filter screen (13) is arranged at an air inlet (5) of the air intake box (4), and a cleaning mechanism for removing impurities is arranged at the filter screen (13), the air intake box (4) is connected to a sampling box (6) and a detection box (7) in sequence, the cable winch (3) is movably arranged on the ground movable seat (1) via a displacement compensation mechanism, a cable (8) is wound around the cable winch (3), and two ends of the cable (8) are respectively electrically connected to the rotorcraft (2) and a power supply (9); The displacement compensation mechanism comprises a forward threaded rod (21) and a reverse threaded rod (22), one end of the forward threaded rod (21) and the reverse threaded rod (22) are rotatably connected via a connecting piece (23), the other ends of the forward threaded rod (21) and the reverse threaded rod (22) are respectively limited on two bearing seats (24), the cable winch (3) is movably sleeved on the forward threaded rod (21) and the reverse threaded rod (22), and the two ends of the cable winch (3) are respectively connected to the forward threaded rod (21) and the reverse threaded rod (22). The threaded rod (22) is threadedly engaged, the cable winch (3) is drivingly connected to the driving mechanism, a bearing frame (25) is arranged above the two bearing seats (24), a wire guide (26) is arranged in the middle of the bearing frame (25) for facilitating the retraction and release of the cable (8), the end faces of the forward threaded rod (21) and the reverse threaded rod (22) are both provided with first end face gears (27), and the outer sides of the two bearing seats (24) are provided with stop mechanisms (28) respectively engaged with the two first end face gears (27); The stop mechanism (28) comprises a plurality of guide posts (29) extending toward the outside of the bearing seat (24), a plurality of guide posts (29) being movably sleeved with moving blocks (30), a plurality of guide posts (29) having an end close to the bearing seat (24) being fixedly sleeved with an electromagnet (31), a plurality of guide posts (29) having an end away from the bearing seat (24) being provided with a stop block (32), the stop block (32) being connected to the electromagnet (31) via a return spring (50), a permanent magnet being provided in the moving block (30), and a second end face gear (33) cooperating with the first end face gear (27) being provided at one end of the moving block (30) close to the bearing seat (24); The driving mechanism comprises a columnar gear (40) and a driving motor (41); the columnar gear (40) is located below the cable winch (3); the driving motor (41) is drivingly connected to one end of the columnar gear (40); and one end of the cable winch (3) is provided with a driven gear (42) meshing with the columnar gear (40).

2. The volatile organic compound sampling and detection device according to claim 1, characterized in that: A turntable (10) is rotatably provided at the bottom of the rotorcraft (2), a avoidance hole (11) is provided in the middle of the turntable (10) for facilitating the passage of the cable (8), the air intake box (4), the sampling box (6) and the detection box (7) are all arranged on the turntable (10), a vertical fixed air wing (12) is provided on the turntable (10), and the fixed air wing (12) and the air intake box (4) are respectively arranged on both sides of the turntable (10), and the air inlet (5) is arranged on a side of the air intake box (4) away from the fixed air wing (12).

3. The volatile organic compound sampling and detection device according to claim 1, characterized in that: The cleaning mechanism comprises a brush rod (14) movably arranged at the filter screen (13), guide rails (15) are arranged on both sides of the filter screen (13), the brush rod (14) is provided with guide wheels respectively slidably matched with the two guide rails (15), the air intake box (4) is provided with a conveyor belt (16) parallel to the guide rails (15), the conveyor belt (16) is connected to the cleaning motor (17) by transmission, a connecting rod (18) is arranged at one end of the brush rod (14), a strip groove (19) is opened in the extension direction of the connecting rod (18), and a driving wheel (20) slidably matched with the strip groove (19) is arranged on one side of the conveyor belt (16).

4. The volatile organic compound sampling and detection device according to claim 1, characterized in that: A trigger (34) is provided on the inner side of each of the two bearing seats (24); the two electromagnets (31) are electrically connected to a control power supply (36) via a single-pole double-throw switch (35); and the single-pole double-throw switch (35) is electrically connected to the two triggers (34) via a controller.

5. The volatile organic compound sampling and detection device according to claim 1, characterized in that: The connecting member (23) comprises a sleeve (37) and a connecting sleeve (38) which are respectively fixedly connected to the end of the forward threaded rod (21) and the end of the reverse threaded rod (22); a bearing (39) is arranged in the sleeve (37); and an outer wall of the connecting sleeve (38) is rotatably connected to an inner wall of the sleeve (37) via the bearing (39).

6. The volatile organic compound sampling and detection device according to claim 1, characterized in that: A conductive slip ring (43) is provided at one end of the cable winch (3) away from the driven gear (42); one end of the cable (8) is electrically connected to a rotating portion (44) of the conductive slip ring (43); a fixed portion (45) of the conductive slip ring (43) is in sliding contact with a conductive rod (46); the conductive rod (46) is electrically connected to a power supply (9); and the axial dimensions of the columnar gear (40) and the conductive rod (46) are not less than the axial movement stroke of the cable winch (3).

7. The volatile organic compound sampling and detection device according to claim 1, characterized in that: The wire guide (26) comprises a rectangular frame (47), wherein two parallel wire wheels (48) are arranged with a gap therebetween, an annular groove (49) is arranged in the middle of the outer wall of the wire wheel (48), and the cable (8) passes through the annular groove (49) between the two wire wheels (48), the radial dimension of the cable (8) is greater than the spacing between the two wire wheels (48), and the radial dimension of the cable (8) is smaller than the spacing between the two annular grooves (49).

Images