CN116086901A

CN116086901A - Sampling device for VOCs detection

Info

Publication number: CN116086901A
Application number: CN202310134108.9A
Authority: CN
Inventors: 刘强; 曹阳; 任昶宇; 史箴; 何吉明; 靳皓琛; 张渝
Original assignee: Sichuan Ecological Environment Monitoring Station
Current assignee: Sichuan Ecological Environment Monitoring Station
Priority date: 2023-02-20
Filing date: 2023-02-20
Publication date: 2023-05-09

Abstract

The invention relates to the field of VOCs detection, in particular to a sampling device for VOCs detection, which comprises an installation box, an air extraction mechanism, an air collecting bag, a rotating disc, a fixing mechanism, an extrusion mechanism and a material taking mechanism, wherein the installation box is provided with a plurality of air inlets; the top of the mounting box is provided with an air inlet, and the air suction mechanism comprises an air delivery pipe which is arranged in the air inlet in a sliding way; the air collecting bag is provided with an air inlet pipe, and the air inlet pipe is provided with an electromagnetic valve which can be closed and opened along with the movement of the air conveying pipe; the rotating disc is arranged in the installation box in a horizontal state and can rotate, and the fixing mechanism is arranged on the rotating disc and used for limiting the position of the air collecting bag; the extrusion mechanism is arranged on the rotating disc and can extrude the fixed air collecting bag along with the movement of the air pipe; the material taking mechanism is arranged on one side of the installation box and is used for taking out the sampled gas collecting bag from the installation box. Through the cooperation of rolling disc and fixed establishment to can take a sample in succession, can extrude the gas collecting bag through extrusion mechanism, thereby guarantee the purity of sample.

Description

Sampling device for VOCs detection

Technical Field

The invention relates to the field of VOCs detection, in particular to a sampling device for VOCs detection.

Background

VOCs are volatile organic compounds, generally classified into non-methane hydrocarbons, oxygen-containing organic compounds, halogenated hydrocarbons, nitrogen-containing organic compounds, sulfur-containing organic compounds, and the like, and participate in the formation of ozone and secondary aerosols in the atmospheric environment, which have important effects on regional atmospheric ozone pollution and PM2.5 pollution, most VOCs have unpleasant special odors, and are toxic, irritating, teratogenic, and carcinogenic, and particularly benzene, toluene, formaldehyde, and the like, which cause great harm to human health.

When detecting the environment, need detect free VOCs content, current VOCs detects and collects gas with the sampling device mostly adopts flexible gas collection bag, before collecting, can remain a certain amount of gas in the gas collection bag, if will not be with gas discharge in the gas collection bag, can lead to the gaseous intermixing with the sample to produce the influence to the testing result, and unable continuous sampling leads to the sampling efficiency lower.

Disclosure of Invention

To the problem that prior art exists, provide a sampling device for VOCs detects, through the cooperation of rolling disc and fixed establishment to can take a sample in succession, can extrude the gas collecting bag through extrusion mechanism, thereby guarantee the purity of sample.

In order to solve the problems in the prior art, the invention adopts the following technical scheme:

a sampling device for VOCs detection comprises an installation box, an air extraction mechanism, an air collecting bag, a rotating disc, a fixing mechanism, an extrusion mechanism and a material taking mechanism;

the top of the mounting box is provided with an air inlet, the air extraction mechanism is arranged at the top of the mounting box and comprises an air delivery pipe which is arranged in the air inlet in a sliding manner;

an air inlet pipe matched with the air delivery pipe is arranged on the air collection bag, and an electromagnetic valve capable of being closed and opened along with the movement of the air delivery pipe is arranged on the air inlet pipe;

the rotating disc is arranged in the installation box in a horizontal state and can rotate, a plurality of fixing mechanisms are arranged, the fixing mechanisms are equidistantly arranged along the circumferential direction of the rotating disc, and the fixing mechanisms are used for limiting the positions of the air collecting bags;

a rectangular notch is formed in one side of the mounting box;

the extrusion mechanisms are provided with a plurality of groups, and the extrusion mechanisms are equidistantly arranged along the circumferential direction of the rotating disc and can extrude the fixed air collecting bag along with the movement of the air conveying pipe;

the material taking mechanism is arranged on one side of the installation box far away from the rectangular notch and used for taking out the sampled gas collecting bag from the installation box.

Preferably, each set of securing mechanisms includes a mounting plate;

the mounting plate is horizontally arranged at the top edge of the rotating disc, and the length direction of the mounting plate is perpendicular to the axis direction of the rotating disc;

a placing groove is formed in the center of one side of each mounting plate far away from the axis of the rotating plate, and guide grooves are formed in the inner walls of the two sides of the placing groove;

the outer wall mirror image of the air inlet pipe is provided with a guide block corresponding to the guide groove.

Preferably, a first magnet is arranged at the center of the inner wall of the bottom of each placing groove, and a second magnet corresponding to the first magnet is arranged on each air inlet pipe.

Preferably, the outer wall of the air inlet pipe is provided with a control mechanism capable of opening and closing the electromagnetic valve along with the movement of the air inlet pipe.

Preferably, the control mechanism comprises a guide rod, a sliding plate, a return spring and a socket;

the outer wall of the air inlet pipe is provided with a mounting groove which is arranged in a vertical state, and the guide rod is arranged in the mounting groove in a vertical state;

the sliding plate can be arranged in the mounting groove in a sliding way, and a guide hole for the guide rod to pass through is formed in the sliding plate;

the reset spring is sleeved on the guide rod and used for resetting the sliding plate;

the socket is arranged on the sliding plate, and the electromagnetic valve is connected with the socket through an electric wire;

the outer wall of the gas pipe is provided with a vertically downward extending abutting rod, and the lower end of the abutting rod is provided with a plug matched with the socket.

Preferably, a sealing ring is arranged at the bottom of the gas pipe.

Preferably, each group of extrusion mechanisms comprises a sliding column, a connecting plate, an extrusion plate, a connecting shaft, a pushing spring and a sliding strip;

the mounting plate is provided with sliding holes on two sides along the length direction, two sliding columns are arranged, and the sliding columns can be arranged in the corresponding sliding holes in a sliding manner;

each sliding column is provided with L-shaped connecting strips, two connecting plates are arranged, and the connecting plates are arranged at one end, far away from the sliding column, of the corresponding L-shaped connecting strip;

two connecting holes are formed in each connecting plate, two extrusion plates are arranged, connecting rods corresponding to the connecting holes are arranged on each extrusion plate, the connecting rods can be slidably arranged in the corresponding connecting holes, the two extrusion plates are positioned between the two connecting plates, and each connecting rod is sleeved with an extrusion spring;

the two sides of the bottom of each mounting plate along the length direction are provided with strip-shaped penetrating grooves for avoiding the L-shaped connecting strips, and the strip-shaped penetrating grooves are communicated with the corresponding sliding holes;

a rectangular penetrating groove is formed in the center of the top of the mounting plate, the rectangular penetrating groove is positioned between two sliding holes, the length direction of the rectangular penetrating groove is perpendicular to the axis direction of the sliding holes, a connecting shaft is horizontally and rotatably arranged in the rectangular penetrating groove, the length direction of the connecting shaft is identical to the length direction of the rectangular penetrating groove, a traction rope is arranged at one end, close to the rectangular penetrating groove, of each sliding column, and each traction rope penetrates through the inner wall of the bottom of the corresponding sliding hole and is wound on the rotating shaft;

the pushing springs are arranged in the corresponding sliding holes and are positioned between the corresponding sliding columns and the inner wall of the bottom of the sliding holes;

one end of each connecting shaft far away from the placing groove is provided with a connecting gear, one side of each rectangular penetrating groove far away from the placing groove is provided with an avoiding groove for avoiding the connecting gear, the top of the mounting plate is provided with a sliding groove, the sliding groove is communicated with the avoiding groove, the sliding strip is arranged in the sliding groove in a vertical state and can slide, the sliding strip is provided with gear teeth along the length direction, and the gear teeth are meshed with the connecting gear;

the air pipe is provided with an L-shaped pressing plate for pressing the sliding strip.

Preferably, each sliding bar top is provided with a placing disc, a guide hole is formed in the center of the top of the placing disc, a reset rod is arranged on each mounting plate and can be slidably arranged in the corresponding guide hole, a return spring is sleeved on each reset rod, and the return springs are located between the corresponding mounting plates and the placing disc.

Preferably, the air extraction mechanism further comprises a first linear driver and an air pump;

the two first linear drivers are arranged on the inner wall of the top of the installation box in a vertical state, and the executing parts of the two first linear drivers are connected with the corresponding placing plates;

the air pump is arranged at the top of the mounting box, and the output end of the air pump is connected with the top of the air pipe through the conveying hose;

the input of air pump is connected with the one end of input hose, and the one end that the input hose kept away from the air pump is provided with the hollow tube.

Preferably, the material taking mechanism comprises a second linear driver and a collecting bin;

a discharge groove is formed in one side, far away from the rectangular notch, of the mounting box, a second linear driver is arranged on the outer wall of the mounting box and is positioned above the discharge groove, and an execution part of the second linear driver stretches into the mounting box and is provided with a pushing plate for pushing the air collecting bag out of the corresponding placing groove;

the collection bin is arranged on one side of the installation box away from the rectangular notch and is used for accommodating the gas collecting bag.

Compared with the prior art, the beneficial effects of this application are:

1. this application is through the cooperation of hollow tube, the air pump, a linear drive, thereby can take a sample the gas of co-altitude not, through the slip post, the connecting plate, the stripper plate, the connecting axle, push spring and the cooperation of sliding strip, thereby can extrude the gas collecting bag before taking a sample, thereby improve the purity of gas in the gas collecting bag, through the guide arm, the stripper plate, reset spring, the cooperation of plug and socket, when the stripper plate is not in contact with the gas collecting bag, the solenoid valve is in the closed condition, after intake pipe and gas-supply pipe contact, plug and socket contact, the solenoid valve circular telegram, make the solenoid valve open, thereby make gas can enter into in the gas collecting bag, thereby accomplish the sample work.

2. This application is through the cooperation of rolling disc, air pump, gas-supply pipe, second linear drive ware and air collecting bag, and the second linear drive ware can be with the sample push of sample completion collect in the storehouse, and the staff is put into the standing groove that corresponds with the air collecting bag through the rectangle breach in to can realize continuous sample work.

Drawings

FIG. 1 is a perspective view of a sampling device for detecting VOCs;

FIG. 2 is a second perspective view of a sampling device for detecting VOCs;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is an exploded perspective view of a sampling device for detecting VOCs;

FIG. 5 is a second exploded perspective view of a sampling device for detecting VOCs;

FIG. 6 is an enlarged view of a portion of FIG. 5 at B;

FIG. 7 is a partial perspective view of a sampling device for VOCs detection;

FIG. 8 is an enlarged view of a portion of FIG. 7 at C;

FIG. 9 is a partial enlarged view of the portion D of FIG. 7

FIG. 10 is a partially exploded perspective view of a sampling device for detecting VOCs;

FIG. 11 is an enlarged view of a portion of FIG. 10 at E;

FIG. 12 is a partial exploded view II of a sampling device for VOCs detection;

FIG. 13 is an enlarged view of a portion of FIG. 12 at F;

fig. 14 is a perspective view of a gas collecting pouch in a sampling device for detecting VOCs.

The reference numerals in the figures are:

1-installing a box; 11-an air inlet hole; 12-rectangular notch; 13-universal wheels; 14-driving a motor; 15-a discharge groove;

2-an air extraction mechanism; 21-a gas pipe; 211-a touch-up lever; 212-plug; 213-sealing ring; 214-L shaped pressing plate; 215-placing a plate; 22-a first linear drive; 23-an air pump; 231-a delivery hose; 232-an input hose; 233-hollow tube;

3-air collecting bag; 31-an air inlet pipe; 311-guide blocks; 312-a second magnet; 313-mounting groove; 32-an electromagnetic valve; 321-electric wires;

4-rotating a disc;

5-a fixing mechanism; 51-mounting plate; 511-a placement tank; 5111-a first magnet; 512-guide slots; 513-sliding holes; 514-bar-shaped through groove; 515-rectangular through slots; 5151-avoidance slot; 5152-sliding groove; 516-reset lever; 5161-a return spring; 5162-a second limit disk;

6-an extrusion mechanism; 61-sliding column; 611-L shaped connecting bars; 612-pulling rope; 62-connecting plates; 621-connecting holes; 63-pressing plate; 631-connecting rods; 6311-first limit plate; 632-pressing the spring; 64-connecting shaft; 641-connecting gears; 65-pushing a spring; 66-sliding bars; 661-gear teeth; 662-placing a tray; 6621-guide holes;

7-a material taking mechanism; 71-a second linear drive; 711-pushing plate; 72-collecting bin;

8-a control mechanism; 81-guiding rod; 82-a sliding plate; 821-guide holes; 83-a return spring; 84-socket.

Detailed Description

The invention will be further described in detail with reference to the drawings and the detailed description below, in order to further understand the features and technical means of the invention and the specific objects and functions achieved.

Referring to fig. 1 to 14, a sampling device for detecting VOCs comprises a mounting box 1, an air extraction mechanism 2, an air collecting bag 3, a rotating disc 4, a fixing mechanism 5, an extrusion mechanism 6 and a material taking mechanism 7; the top of the mounting box 1 is provided with an air inlet hole 11, the air extraction mechanism 2 is arranged at the top of the mounting box 1, and the air extraction mechanism 2 comprises an air delivery pipe 21 which is arranged in the air inlet hole 11 in a sliding manner; the air collecting bag 3 is provided with an air inlet pipe 31 matched with the air delivery pipe 21, and the air inlet pipe 31 is provided with an electromagnetic valve 32 which can be closed and opened along with the movement of the air delivery pipe 21; the rotating disc 4 is arranged in the mounting box 1 in a horizontal state in a rotatable manner, a plurality of fixing mechanisms 5 are arranged, the fixing mechanisms 5 are equidistantly arranged along the circumferential direction of the rotating disc 4, and the fixing mechanisms 5 are used for limiting the position of the air collecting bag 3; a rectangular notch 12 is formed in one side of the mounting box 1; the squeezing mechanisms 6 are provided with a plurality of groups, the squeezing mechanisms 6 are equidistantly arranged along the circumferential direction of the rotating disc 4, and the squeezing mechanisms 6 can squeeze the fixed air collecting bag 3 along with the movement of the air conveying pipe 21; the material taking mechanism 7 is arranged on one side of the mounting box 1 far away from the rectangular notch 12 and is used for taking out the sampled gas collecting bag 3 from the mounting box 1.

The universal wheels 13 are arranged at four corners of the bottom of the mounting box 1, the mounting box 1 is pushed by a worker to move to a region to be sampled, a driving motor 14 for driving the rotating disc 4 to rotate is arranged on the inner wall of the top of the mounting box 1, the gas collecting bag 3 is placed on the fixing mechanism 5 of the rotating disc 4 by the worker through the rectangular notch 12, then the driving motor 14 is adjusted, the rotating disc 4 is driven by the driving motor 14 to rotate, at the moment, the electromagnetic valve 32 on the gas inlet pipe 31 is in a closed state, the air extracting mechanism 2 extracts air, the extracted air enters the gas conveying pipe 21, then the air conveying pipe 21 is adjusted to move downwards vertically, in the sampling state, the gas conveying pipe 21 and the gas inlet pipe 31 on the corresponding gas collecting bag 3 are coaxially arranged, the electromagnetic valve 32 on the corresponding position gas collecting bag 3 is opened along with the movement of the gas conveying pipe 21, the extruding mechanism 6 can extrude the gas collecting bag 3 along with the movement of the gas conveying pipe 21, so that the gas in the gas collecting bag 3 can be discharged, and the purity of the collected gas can be guaranteed.

Referring to fig. 5, 6, 7 and 10, each set of securing mechanisms 5 includes a mounting plate 51; the mounting plate 51 is horizontally arranged at the top edge of the rotating disc 4, and the length direction of the mounting plate 51 is perpendicular to the axial direction of the rotating disc 4; a placing groove 511 is formed in the center of one side of each mounting plate 51 far away from the axis of the rotating plate 4, and guide grooves 512 are formed in the inner walls of two sides of the placing groove 511; the outer wall of the air inlet pipe 31 is provided with a guide block 311 corresponding to the guide groove 512 in a mirror image manner.

The staff places the gas collecting bag 3 in the mounting box 1 through the rectangle breach 12, intake pipe 31 outer wall mirror image is provided with two guide blocks 311, guide block 311 can be gliding set up in corresponding guide slot 512, thereby can restrict the position of gas collecting bag 3, afterwards, adjust rolling disc 4, rolling disc 4 rotates, the staff can continue to add new gas collecting bag 3 in to the standing slot 511, thereby can carry out continuous sample, after the sample is accomplished, take out the gas collecting bag 3 that the sample was accomplished from the mounting box 1 through feeding mechanism 7, thereby the staff of being convenient for detects fast, thereby improve detection efficiency.

Referring to fig. 10 and 14, a first magnet 5111 is provided at the center of the inner wall of the bottom of each of the placement grooves 511, and a second magnet 312 corresponding to the first magnet 5111 is provided on each of the intake pipes 31.

Through being provided with first magnet 5111 at standing groove 511 bottom inner wall, all be provided with second magnet 312 on the intake pipe 31 of every collection air bag 3, through the cooperation of guide way 512 and guide block 311, thereby with collection air bag 3 remove to the standing groove 511 of corresponding mounting panel 51 in, at this moment, second magnet 312 and first magnet 5111 inter attraction, thereby carry out the secondary spacing to collection air bag 3's position, guarantee that intake pipe 31 and gas-supply pipe 21 can coaxial setting, thereby be convenient for take a sample the work.

Referring to fig. 8, 10, 12 and 13, the outer wall of the air inlet pipe 31 is provided with a control mechanism 8 capable of opening and closing the electromagnetic valve 32 in accordance with the movement of the air delivery pipe 21; the control mechanism 8 includes a guide rod 81, a slide plate 82, a return spring 83, and a socket 84; the outer wall of the air inlet pipe 31 is provided with a mounting groove 313, the mounting groove 313 is arranged in a vertical state, and the guide rod 81 is arranged in the mounting groove 313 in a vertical state; the sliding plate 82 is slidably disposed in the mounting groove 313, and a guide hole 821 through which the guide rod 81 passes is provided on the sliding plate 82; the return spring 83 is sleeved on the guide rod 81 and is used for resetting the sliding plate 82; the socket 84 is provided on the slide plate 82, and the solenoid valve 32 is connected to the socket 84 through the electric wire 321; the outer wall of the air pipe 21 is provided with a vertically downward extending abutting rod 211, and the lower end of the abutting rod 211 is provided with a plug 212 matched with the socket 84.

As the gas pipe 21 moves downward in the vertical direction, at this time, the abutting lever 211 provided on the gas pipe 21 can move toward the direction approaching the socket 84, at this time, the plug 212 provided on the abutting lever 211 can contact with the socket 84, so that the solenoid valve 32 provided on the gas pipe 31 can be energized, at this time, the solenoid valve 32 is opened, so that the gas pipe 31 is opened, the pressing mechanism 6 can press the gas collecting bag 3 with the movement of the gas pipe 31, as the gas pipe 21 continues to move, the gas in the gas collecting bag 3 can be discharged from the gas collecting bag 3 through the gas pipe 21, the slide plate 82 moves toward the direction approaching the inner wall of the bottom of the mounting box 1 along the length direction of the mounting groove 313, therefore, a space for avoiding is provided for the discharge of the gas in the gas collecting bag 3, after the lower end of the gas pipe 21 is contacted with the upper end of the gas inlet pipe 31, the gas extraction mechanism 2 is adjusted, so that the gas is conveyed into the gas collecting bag 3, the purity of the gas in the gas collecting bag 3 is ensured, after the conveying is finished, the gas pipe 21 moves in the vertical direction towards the direction away from the gas inlet pipe 31, at the moment, the plug 212 is separated from the socket 84, the electromagnetic valve 32 is closed, the gas leakage in the gas collecting bag 3 is avoided, and the sliding plate 82 moves to the upper end of the mounting groove 313 along the length direction of the mounting groove 313 under the action of the elastic force of the reset spring 83, so that the next sampling is facilitated.

Referring to fig. 12 and 13, a seal ring 213 is provided at the bottom of the gas delivery pipe 21.

Through being provided with sealing washer 213 in gas-supply pipe 21 bottom, when gas-supply pipe 21 and intake pipe 31 contact, sealing washer 213 can improve the leakproofness between gas-supply pipe 21 and the intake pipe 31 to guarantee that the gas of extraction can be accurate enter into the gas collection bag 3 inside.

Referring to fig. 4 to 11, each set of pressing mechanisms 6 includes a slide column 61, a connection plate 62, a pressing plate 63, a connection shaft 64, a push spring 65, and a slide bar 66; the mounting plate 51 is provided with sliding holes 513 on both sides in the length direction, two sliding columns 61 are provided, and the sliding columns 61 can be slidably arranged in the corresponding sliding holes 513; each sliding column 61 is provided with L-shaped connecting strips 611, two connecting plates 62 are arranged, and each connecting plate 62 is arranged at one end of the corresponding L-shaped connecting strip 611 far away from the sliding column 61; two connecting holes 621 are formed in each connecting plate 62, two extrusion plates 63 are arranged, connecting rods 631 corresponding to the connecting holes 621 are arranged on each extrusion plate 63, the connecting rods 631 can be slidably arranged in the corresponding connecting holes 621, the two extrusion plates 63 are located between the two connecting plates 62, and each connecting rod 631 is sleeved with an extrusion spring 632; the two sides of the bottom of each mounting plate 51 along the length direction are provided with strip-shaped penetrating grooves 514 for avoiding the L-shaped connecting strips 611, and the strip-shaped penetrating grooves 514 are communicated with the corresponding sliding holes 513; a rectangular through groove 515 is formed in the center of the top of the mounting plate 51, the rectangular through groove 515 is located between the two sliding holes 513, the length direction of the rectangular through groove 515 is perpendicular to the axial direction of the sliding holes 513, a connecting shaft 64 is arranged in the rectangular through groove 515 in a horizontal state in a rotatable mode, the length direction of the connecting shaft 64 is identical to the length direction of the rectangular through groove 515, a traction rope 612 is arranged at one end, close to the rectangular through groove 515, of each sliding column 61, and each traction rope 612 penetrates through the inner wall of the bottom of the corresponding sliding hole 513 and is wound on the rotating shaft; the pushing springs 65 are two, and the pushing springs 65 are arranged in the corresponding sliding holes 513 and are positioned between the corresponding sliding columns 61 and the inner walls of the bottoms of the sliding holes 513; a connecting gear 641 is arranged at one end of each connecting shaft 64 far away from the placing groove 511, an avoiding groove 5151 for avoiding the connecting gear 641 is arranged at one side of each rectangular penetrating groove 515 far away from the placing groove 511, a sliding groove 5152 is arranged at the top of the mounting plate 51, the sliding groove 5152 is communicated with the avoiding groove 5151, a sliding bar 66 is arranged in the sliding groove 5152 in a vertical state in a sliding manner, gear teeth 661 are arranged on the sliding bar 66 along the length direction, and the gear teeth 661 are meshed with the connecting gear 641; the air delivery pipe 21 is provided with an L-shaped pressing plate 214 for pressing the slide bar 66.

The end of each connecting rod 631 far away from the extrusion plate 63 is provided with a first limit disc 6311, the first limit disc 6311 can limit the position of the extrusion plate 63, thereby avoiding the connecting rod 631 from being pushed out of the connecting hole 621 by the elastic force of the extrusion spring 632, along with the movement of the air delivery pipe 21, the L-shaped pressing plate 214 arranged on the air delivery pipe 21 can be contacted with the sliding strip 66, thereby enabling the sliding strip 66 to move along the sliding groove 5152, the sliding strip 66 is provided with gear teeth 661, the gear teeth 661 are meshed with the connecting gear 641, along with the movement of the sliding strip 66, the connecting gear 641 rotates, along with the rotation of the connecting gear 641, the connecting pump rotates, the connecting shaft 64 drives the two traction ropes 612 to wind, along with the connecting shaft 64 pulling the two traction ropes 612, the two sliding columns 61 can synchronously move towards the direction close to the rectangular through groove 515, along with the movement of the two sliding columns 61, the two connecting plates 62 are close to each other, the squeeze plates 63 slidably arranged on the connecting plates 62 can squeeze the air collecting bag 3, the air in the air collecting bag 3 can be discharged from the air collecting bag 3 through the air inlet pipe 31, at this time, the air pumping mechanism 2 can convey the extracted air into the air inlet pipe 31, along with the expansion of the air collecting bag 3, the two squeeze plates 63 are far away from each other, so that the squeeze springs 632 can generate elastic force to provide a space for the entering of the air, after the sampling is completed, the air conveying pipe 21 moves towards the direction away from the air inlet pipe 31, along with the separation of the air conveying pipe 21 and the air inlet pipe 31, the electromagnetic valve 32 is closed, so that the air collecting bag 3 is sealed, at this time, the slide bars 66 are adjusted, the slide bars 66 move vertically upwards along the slide grooves 5152, so that the two squeeze plates 63 can be far away from each other, thereby facilitating the next operation.

Referring to fig. 10 and 11, a placement tray 662 is provided on the top of each sliding bar 66, a guide hole 6621 is provided in the center of the top of the placement tray 662, a reset lever 516 is provided on each mounting plate 51, the reset levers 516 are slidably disposed in the corresponding guide holes 6621, a reset spring 5161 is provided on each reset lever 516 in a sleeved manner, and the reset spring 5161 is located between the corresponding mounting plate 51 and the placement tray 662.

The top of each reset rod 516 is provided with a second limiting disc 5162, the second limiting discs 5162 can limit the position of the reset rod 516, so that the sliding strips 66 are prevented from being pushed out of the sliding grooves 5152 by the elastic force of the reset springs 83, when sampling is carried out, the L-shaped pressing plates 214 are in contact with the sliding strips 66, the sliding strips 66 move along the sliding grooves 5152, at this time, the placing discs 662 move along the length direction of the reset rods 516, so that the reset springs 5161 are extruded, the elastic force is generated by the reset springs 5161, when sampling is completed, the sliding strips 66 move vertically upwards along the sliding grooves 5152, the L-shaped pressing plates 214 are separated from the sliding strips 66, the placing discs 662 arranged at the tops of the sliding strips 66 can move along the length direction of the reset rods 516 under the elastic force of the reset springs 5161, and when the placing discs 662 are in contact with the second limiting discs 5162, the sliding strips 66 are reset, and the next extrusion is facilitated.

Referring to fig. 2, 3, 4 and 12, the air extracting mechanism 2 further includes a first linear actuator 22 and an air pump 23; two placing plates 215 are arranged on the outer wall mirror image of the air pipe 21, two first linear drivers 22 are arranged, the two first linear drivers 22 are arranged on the inner wall of the top of the installation box 1 in a vertical state, and the executing parts of the two first linear drivers 22 are connected with the corresponding placing plates 215; the air pump 23 is arranged at the top of the mounting box 1, and the output end of the air pump 23 is connected with the top of the air pipe 21 through the conveying hose 231; the input end of the air pump 23 is connected with one end of an input hose 232, and one end of the input hose 232 away from the air pump 23 is provided with a hollow tube 233.

The staff adjusts two first linear drivers 22, and two first linear drivers 22 can drive gas-supply pipe 21 to remove in the vertical direction, and after gas-supply pipe 21 and intake pipe 31 contact, adjust air pump 23, the input of air pump 23 passes through input hose 232 and is connected with hollow pipe 233, and the staff adjusts hollow pipe 233 to can extract the gas of different altitudes, the gas of being extracted can be followed output hose, gas-supply pipe 21 and intake pipe 31 and is got into the collection bag 3 inside, thereby accomplish the sample to this altitude.

Referring to fig. 2 and 5, the take off mechanism 7 includes a second linear drive 71 and a collection bin 72; a discharge groove 15 is formed in one side, far away from the rectangular notch 12, of the mounting box 1, a second linear driver 71 is arranged on the outer wall of the mounting box 1 and is positioned above the discharge groove 15, and an execution part of the second linear driver 71 extends into the mounting box 1 and is provided with a pushing plate 711 for pushing the air collecting bag 3 out of the corresponding placing groove 511; the collecting bin 72 is provided at a side of the mounting box 1 remote from the rectangular notch 12 and is adapted to receive the collecting bag 3.

Through being provided with second linear drive 71, the executive part of second linear drive 71 stretches into inside the mounting box 1, the staff adjusts second linear drive 71, second linear drive 71 drives and pushes away flitch 711 and remove, push away flitch 711 and intake pipe 31 contact, under the cooperation of guide way 512 and guide block 311, collection bag 3 can follow the standing groove 511 and get into the storehouse through discharge groove 15, thereby realize collecting collection bag 3 that the sampling is accomplished, alleviate staff's working strength, the staff is through putting into new collection bag 3 in rectangle breach 12 department and thereby can realize continuous sampling.

The foregoing examples merely illustrate one or more embodiments of the invention, which are described in greater detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. The sampling device for detecting VOCs is characterized by comprising a mounting box (1), an air extraction mechanism (2), an air collecting bag (3), a rotating disc (4), a fixing mechanism (5), an extrusion mechanism (6) and a material taking mechanism (7);

the top of the installation box (1) is provided with an air inlet hole (11), the air extraction mechanism (2) is arranged at the top of the installation box (1), and the air extraction mechanism (2) comprises an air pipe (21) which is arranged in the air inlet hole (11) in a sliding way;

an air inlet pipe (31) matched with the air delivery pipe (21) is arranged on the air collection bag (3), and an electromagnetic valve (32) which can be closed and opened along with the movement of the air delivery pipe (21) is arranged on the air inlet pipe (31);

the rotating disc (4) is arranged in the installation box (1) in a horizontal state in a rotatable mode, a plurality of fixing mechanisms (5) are arranged, the fixing mechanisms (5) are equidistantly arranged along the circumferential direction of the rotating disc (4), and the fixing mechanisms (5) are used for limiting the position of the air collecting bag (3);

a rectangular notch (12) is formed in one side of the mounting box (1);

the extrusion mechanisms (6) are provided with a plurality of groups, the extrusion mechanisms (6) are equidistantly arranged along the circumferential direction of the rotating disc (4), and the extrusion mechanisms (6) can extrude the fixed air collecting bag (3) along with the movement of the air conveying pipe (21);

the material taking mechanism (7) is arranged on one side of the installation box (1) far away from the rectangular notch (12) and is used for taking out the sampled gas collecting bag (3) from the installation box (1).

2. A sampling device for the detection of VOCs according to claim 1, characterized in that each set of fixing means (5) comprises a mounting plate (51);

the mounting plate (51) is horizontally arranged at the top edge of the rotating disc (4), and the length direction of the mounting plate (51) is perpendicular to the axis direction of the rotating disc (4);

a placing groove (511) is arranged in the center of one side of each mounting plate (51) far away from the axis of the rotating plate (4), and guide grooves (512) are formed in the inner walls of two sides of the placing groove (511);

the outer wall mirror image of the air inlet pipe (31) is provided with a guide block (311) corresponding to the guide groove (512).

3. A sampling device for VOCs detection according to claim 2, wherein a first magnet (5111) is provided at the center of the inner wall of the bottom of each placement groove (511), and a second magnet (312) corresponding to the first magnet (5111) is provided on each air inlet pipe (31).

4. A sampling device for VOCs detection according to claim 3, characterized in that the outer wall of the air inlet pipe (31) is provided with a control mechanism (8) which can open and close the solenoid valve (32) with the movement of the air delivery pipe (21).

5. A sampling device for the detection of VOCs according to claim 4, characterized in that the control mechanism (8) comprises a guiding rod (81), a sliding plate (82), a return spring (83) and a socket (84);

the outer wall of the air inlet pipe (31) is provided with a mounting groove (313), the mounting groove (313) is arranged in a vertical state, and the guide rod (81) is arranged in the mounting groove (313) in a vertical state;

the sliding plate (82) is slidably arranged in the mounting groove (313), and a guide hole (821) for the guide rod (81) to pass through is formed in the sliding plate (82);

the return spring (83) is sleeved on the guide rod (81) and used for resetting the sliding plate (82);

the socket (84) is arranged on the sliding plate (82), and the electromagnetic valve (32) is connected with the socket (84) through an electric wire (321);

the outer wall of the air pipe (21) is provided with a vertically downward extending abutting rod (211), and the lower end of the abutting rod (211) is provided with a plug (212) matched with the socket (84).

6. A sampling device for the detection of VOCs according to claim 1, characterized in that the bottom of the gas pipe (21) is provided with a sealing ring (213).

7. A sampling device for VOCs detection according to claim 1, characterized in that each set of compression mechanisms (6) comprises a sliding column (61), a connection plate (62), a compression plate (63), a connection shaft (64), a push spring (65) and a sliding bar (66);

the mounting plate (51) is provided with sliding holes (513) on two sides along the length direction, two sliding columns (61) are arranged, and the sliding columns (61) can be arranged in the corresponding sliding holes (513) in a sliding manner;

each sliding column (61) is provided with L-shaped connecting strips (611), two connecting plates (62) are arranged, and each connecting plate (62) is arranged at one end, far away from the sliding column (61), of the corresponding L-shaped connecting strip (611);

two connecting holes (621) are formed in each connecting plate (62), two extruding plates (63) are arranged, connecting rods (631) corresponding to the connecting holes (621) are arranged on each extruding plate (63), the connecting rods (631) can be slidably arranged in the corresponding connecting holes (621), the two extruding plates (63) are located between the two connecting plates (62), and each connecting rod (631) is sleeved with an extruding spring (632);

the two sides of the bottom of each mounting plate (51) along the length direction are provided with strip-shaped penetrating grooves (514) for avoiding the L-shaped connecting strips (611), and the strip-shaped penetrating grooves (514) are communicated with the corresponding sliding holes (513);

a rectangular penetrating groove (515) is formed in the center of the top of the mounting plate (51), the rectangular penetrating groove (515) is located between two sliding holes (513), the length direction of the rectangular penetrating groove (515) is perpendicular to the axis direction of the sliding holes (513), a connecting shaft (64) is arranged in the rectangular penetrating groove (515) in a horizontal state and can rotate, the length direction of the connecting shaft (64) is identical to the length direction of the rectangular penetrating groove (515), a traction rope (612) is arranged at one end, close to the rectangular penetrating groove (515), of each sliding column (61), and each traction rope (612) penetrates through the inner wall of the bottom of the corresponding sliding hole (513) and is wound on a rotating shaft;

the pushing springs (65) are arranged in the corresponding sliding holes (513) and are positioned between the corresponding sliding columns (61) and the inner walls of the bottoms of the sliding holes (513);

one end of each connecting shaft (64) far away from the placing groove (511) is provided with a connecting gear (641), one side of each rectangular penetrating groove (515) far away from the placing groove (511) is provided with an avoiding groove (5151) for avoiding the connecting gear (641), the top of the mounting plate (51) is provided with a sliding groove (5152), the sliding groove (5152) is communicated with the avoiding groove (5151), a sliding strip (66) is arranged in the sliding groove (5152) in a vertical mode and can slide, gear teeth (661) are arranged on the sliding strip (66) along the length direction, and the gear teeth (661) are meshed with the connecting gear (641);

an L-shaped pressing plate (214) for pressing the sliding bar (66) is arranged on the air pipe (21).

8. The sampling device for detecting VOCs according to claim 7, wherein a placement tray (662) is provided at the top of each sliding bar (66), a guide hole (6621) is provided at the center of the top of the placement tray (662), a reset lever (516) is provided on each mounting plate (51), the reset lever (516) can be slidably provided in the corresponding guide hole (6621), a reset spring (5161) is provided on each reset lever (516), and the reset spring (5161) is located between the corresponding mounting plate (51) and the placement tray (662).

9. A sampling device for the detection of VOCs according to claim 1, characterized in that the suction means (2) further comprises a first linear drive (22) and an air pump (23);

two placing plates (215) are arranged on the outer wall mirror image of the air pipe (21), two first linear drivers (22) are arranged on the inner wall of the top of the installation box (1) in a vertical state, and executing parts of the two first linear drivers (22) are connected with the corresponding placing plates (215);

the air pump (23) is arranged at the top of the installation box (1), and the output end of the air pump (23) is connected with the top of the air pipe (21) through the conveying hose (231);

the input end of the air pump (23) is connected with one end of an input hose (232), and one end of the input hose (232) far away from the air pump (23) is provided with a hollow tube (233).

10. A sampling device for the detection of VOCs according to claim 1, characterized in that the extracting means (7) comprises a second linear drive (71) and a collecting bin (72);

a discharge groove (15) is formed in one side, far away from the rectangular notch (12), of the mounting box (1), a second linear driver (71) is arranged on the outer wall of the mounting box (1) and is positioned above the discharge groove (15), and an execution part of the second linear driver (71) stretches into the mounting box (1) and is provided with a pushing plate (711) for pushing the air collecting bag (3) out of the corresponding placing groove (511);

the collecting bin (72) is arranged on one side of the mounting box (1) far away from the rectangular notch (12) and is used for accommodating the air collecting bag (3).