CN214812804U

CN214812804U - Pneumatic conveying tobacco leaf detecting and removing device with twice detecting and removing functions

Info

Publication number: CN214812804U
Application number: CN202121171915.0U
Authority: CN
Inventors: 杭建军; 徐大川
Original assignee: NANJING TUZHI AUTOMATION TECHNOLOGY CO LTD
Current assignee: NANJING TUZHI AUTOMATION TECHNOLOGY CO LTD
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2021-11-23
Anticipated expiration: 2031-05-28

Abstract

The utility model relates to a pneumatic tobacco leaf detecting and removing device with twice detecting and removing functions, which comprises a pneumatic pipeline and two video cabinets arranged on one side of the pneumatic pipeline, wherein the whole device is provided with two detecting and removing areas on the same pneumatic pipeline, the first detecting and removing area is arranged on a vertical straight line rectangular pipeline, the second detecting and removing area is arranged on a horizontal straight line rectangular pipeline, a plurality of cameras and reflectors are fixed inside the two video cabinets, and each video cabinet is provided with two illuminating light sources, a background light source and an injection valve, the air conveying pipeline is respectively provided with two detection windows, a rejection notch and a sundry outlet, the two sundry outlets are connected with respective sundry channels, light sundries are discharged through a light sundry outlet air lock of the sundry channels, a material-gas separating device is arranged at the rear end of the air conveying pipeline, the lower end of the material-gas separating device is connected with a tobacco leaf outlet, qualified tobacco leaves are discharged through the tobacco leaf outlet, and separated pure gas is returned to the front end of the air conveying pipeline. The utility model discloses carry out twice detection to the tobacco leaf and reject, improve the purity of tobacco leaf greatly.

Description

Pneumatic conveying tobacco leaf detecting and removing device with twice detecting and removing functions

Technical Field

The utility model relates to a tobacco leaf detection device technical field especially relates to a wind send tobacco leaf to detect removing devices with twice detection and removal function.

Background

The quality of tobacco leaves plays a decisive role in the quality of cigarettes, and during the processes of harvesting, airing, transferring and baking, the tobacco leaves can generate or be doped with some foreign matters such as paper scraps, hemp ropes, stones, plastics, worm eggs, nests and penicillium changed tobacco leaves, and the foreign matters must be removed before the tobacco leaves are shredded. At present, a photoelectric foreign matter detection and removal device is generally adopted to remove foreign matters in tobacco leaves and penicillium-transformed tobacco leaves.

Photoelectric foreign matter detection and removal devices are mostly high-speed belt conveyor type foreign matter removal devices currently used, such as a Chinese patent publication No. CN 2574432Y intelligent tobacco foreign matter removal device utility model patent and a publication No. CN 201848391U tobacco foreign matter removal system utility model patent; also have wind-force foreign matter removing devices, such as the utility model patent of No. CN201320826119.5 wind-force tobacco flake foreign matter remover, these apparatuses general commonality is that only once detects and rejects, still contain a lot of debris and blue mold tobacco leaf (according to stipulation acceptance standard lower limit 85%) in the qualified tobacco leaf after detecting and rejecting like this, this is still not good enough to the purity of tobacco leaf for the cigarette of high-grade; therefore, many tobacco factories have the desire and the demand for improving the purity of the tobacco leaves, and the impurities in the tobacco leaves and the penicillium tobacco leaves are required to be as few as possible; if the tobacco leaves can be detected and removed for the second time on the basis of the existing detecting and removing functions, impurities in the tobacco leaves and blue mold tobacco leaves are reduced, the purity of the tobacco leaves is improved, and the method is a method with better cost performance.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a wind send tobacco leaf to detect removing devices with twice detection function, the device can effectively accurately accomplish twice on-line measuring of tobacco leaf fast and do twice rejection with non-tobacco leaf impurity and penicillium tobacco leaf, obtain the higher tobacco leaf of purity.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a wind send tobacco leaf to detect removing devices with twice detection and removal function, is including setting up video cabinet one, video cabinet two, wind send pipeline and centrifugal fan in the platform top, its characterized in that, wind send the pipeline to include: the air supply device comprises a vertical straight line rectangular pipeline, a curve pipeline and a transverse straight line rectangular pipeline, wherein a feeding air lock is arranged on one side of the lower end of the air supply pipeline, a heavy sundry outlet air lock is arranged at the lower end of the air supply pipeline, a first video cabinet is arranged on one side of the vertical straight line rectangular pipeline, one side of the video cabinet faces the width direction of the vertical straight line rectangular pipeline, a first camera is fixed inside the first video cabinet through a support, a first reflector is fixed at the corresponding position of the first camera through a support, a first light-transmitting glass is arranged at the corresponding position of the first reflector, a first illumination light source is further fixedly arranged inside the first video cabinet through a support, a first background light source is arranged on the other side of the vertical straight line rectangular pipeline and the first video cabinet through a support, a first high-speed injection valve is arranged above the first illumination light source, and a second high-speed injection valve is arranged at the corresponding position of the first camera and the first reflector, A first detection window is arranged on the vertical linear rectangular pipeline, the light source center of the first background light source is positioned at the corresponding position of the first detection window, a first rejection notch is also arranged on the vertical linear rectangular pipeline, above the first detection window and at the position corresponding to the first high-speed injection valve, a first sundry outlet is arranged on the vertical linear rectangular pipeline and above the other side of the first rejection notch, the first sundry outlet is connected with a first sundry channel, an upward inclined air blocking drum is arranged at the sundry inlet of the first sundry channel, the lower end of the first sundry channel is connected with a light sundry outlet air lock, a second video cabinet is arranged above the horizontal linear rectangular pipeline, a second camera is fixed inside the second video cabinet through a bracket, and a second reflector is fixed at the corresponding position of the second camera through a bracket, a second transparent glass is arranged at the corresponding position of the second reflective mirror, a second illumination light source is fixedly arranged in the second video cabinet through a support, a second background light source is arranged at the other side of the second transverse linear rectangular pipeline and the second video cabinet through a support, a second high-speed injection valve is arranged at the rear side of the second illumination light source, a second detection window is arranged at the corresponding position of the second camera and the second reflective mirror and above and below the second transverse linear rectangular pipeline, the center of the light source of the second background light source is positioned at the corresponding position of the second detection window, a second rejection notch is arranged on the transverse linear rectangular pipeline, behind the second detection window and at the position corresponding to the second high-speed injection valve, a second sundry outlet is arranged below the other side of the second rejection notch and above the transverse linear rectangular pipeline, and the second sundry outlet is connected with a second sundry channel, the lower extreme of debris passageway two is connected with light debris export airlock, horizontal sharp rectangle pipeline rear end is connected with material gas separator, material gas separator sets up is kept away from to video cabinet one, material gas separator's lower extreme has tobacco leaf export airlock through the pipe connection, material gas separator sets up with centrifugal fan integration, centrifugal fan's air-out pipe connection is to the front end of wind-driven pipeline, centrifugal fan passes through dust discharge pipeline and discharges the offal dust.

Preferably, the same air conveying pipeline is provided with a first material detection rejection area and a second material detection rejection area, the first material detection rejection area is located on the vertical straight line rectangular pipeline on the air conveying pipeline, the vertical straight line rectangular pipeline is a vertical straight line rectangular pipeline or an inclined straight line rectangular pipeline, the second material detection rejection area is located on the same transverse straight line rectangular pipeline on the air conveying pipeline, and the transverse straight line rectangular pipeline is a horizontal straight line rectangular pipeline or an inclined straight line rectangular pipeline.

Preferably, the second detection window of the second material detection and rejection area is located at any position on the transverse straight line rectangular pipeline on the air conveying pipeline.

Preferably, the first detection window is arranged in an open mode or in a shielding mode through a transparent material, and the first video cabinet and the first detection window are arranged in a sealing mode.

Preferably, the second detection window is arranged in an open mode or in a shielding mode through a transparent material, and the second video cabinet and the second detection window are arranged in a sealing mode.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model combines the wind tobacco leaf conveying system and the spectral analysis detecting and rejecting system, and utilizes the characteristics of the vertical straight line rectangular pipeline and the transverse straight line rectangular pipeline of the wind tobacco leaf conveying system to detect and reject the material in the wind tobacco leaf conveying pipeline twice, the wind tobacco leaf conveying system has the function of conveying the tobacco leaves to two detecting positions and two rejecting positions by wind power, and finally, conveying the qualified tobacco leaves after detection and rejection to the next specified position, wherein the spectral analysis, detection and rejection system obtains the surface characteristics of the materials such as color, shape, size, texture and the like through online scanning and shooting, the surface characteristics are analyzed and processed through an image processing board card and image processing software, and finally, an analysis and processing result is sent to a high-speed injection valve controller, the high-speed injection valve controller controls the action of the high-speed injection valve, and non-tobacco leaf impurities and penicillium tobacco leaves are blown by compressed air.

2. The utility model discloses compact structure, reasonable relatively, the modern design, the sexual valence relative altitude can be effectively accurately accomplished the identification process of tobacco leaf fast and reject non-tobacco leaf debris and penicillium tobacco leaf, reject through twice detection, and the rejection rate of non-tobacco leaf debris and penicillium tobacco leaf is high, has improved the purity of tobacco leaf greatly.

Drawings

FIG. 1 is a schematic side view of the schematic structure of a pneumatic tobacco leaf detecting and removing device with two-time detecting and removing functions of the present invention;

fig. 2 is an enlarged view of the spectral detection rejection region of fig. 1 according to the present invention.

Fig. 3 is an enlarged view of the air supply duct inspection rejection area of fig. 1 according to the present invention.

In the figure: 1-video cabinet I, 2-camera I, 3-lighting source I, 4-reflector I, 5-transparent glass I, 6-background light source I, 7-vertical straight-line rectangular pipeline, 8 a-first detection rejection region, 8 b-second detection rejection region, 9-feeding air lock, 10-air conveying pipeline, 11-detection window I, 12-high-speed injection valve I, 13-rejection notch I, 14-sundry outlet I, 15-air blocking drum, 16-sundry channel I, 17-curve pipeline, 18-video cabinet II, 19-background light source II, 20-camera II, 21-transparent glass II, 22-lighting source II, 23-reflector II, 24-detection window II, 25-notch rejection II, 26-a second high-speed injection valve, 27-a second impurity outlet, 29-a transverse linear rectangular pipeline, 30-a second impurity channel, 31-a material gas separation device, 33-a centrifugal fan, 34-an air outlet pipeline, 35-a dust discharge pipeline, 36-a tobacco leaf outlet air lock, 37-a light impurity outlet air lock and 39-a heavy impurity outlet air lock.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all embodiments.

As shown in fig. 1-3, a pneumatic tobacco leaf detection and removal device with twice detection and removal functions comprises a first video cabinet 1, a second video cabinet 18, a pneumatic pipeline 10 and a centrifugal fan 33, wherein the first video cabinet, the second video cabinet, the pneumatic pipeline 10 and the centrifugal fan 33 are arranged above a platform, and the pneumatic pipeline 10 comprises: the air supply system comprises a vertical linear rectangular pipeline 7, a curve pipeline 17 and a transverse linear rectangular pipeline 29, wherein a feeding air lock 9 is arranged on one side of the lower end of an air supply pipeline 10, a heavy sundry outlet air lock 39 is arranged on the lower end of the air supply pipeline 10, materials enter the air supply pipeline 10 through the feeding air lock 9, the materials with large specific gravity or heavier materials directly fall to be discharged through the heavy sundry outlet air lock 39, a video cabinet I1 is arranged on one side of the vertical linear rectangular pipeline 7 on the air supply pipeline 10, the video cabinet I1 faces the width direction of the vertical linear rectangular pipeline 7, a camera I2 is fixed inside the video cabinet I1 through a support, the camera I2 adopts a 3-CCD or 4-CCD color high-speed linear array camera, a reflector I4 is fixed on the position, corresponding to the camera I2, the angle of the reflector I4 relative to the camera I2 can be adjusted, a camera I1, a camera I, The corresponding position of a reflector 4 sets up a printing opacity glass 5 to let camera 2 can observe the material in the vertical straight line rectangle pipeline 7 and can isolate external tobacco powder dust again.

An illumination light source I3 is fixedly arranged in a video cabinet I1 through a support, the illumination light source I3 adopts LED linear light sources, the number of the illumination light sources I3 is 2 to 4, a background light source I6 is arranged on the other side of a vertical linear rectangular pipeline 7 and the video cabinet I1 through the support, the background light source I6 adopts the LED linear light sources, a high-speed injection valve I12 is arranged above the illumination light source I3, a detection window I11 is arranged on the vertical linear rectangular pipeline 7 at the position corresponding to a camera I2 and a reflector I4, the center of the light source of the background light source I6 is positioned at the position corresponding to the detection window I11, a rejection notch I13 is also arranged on the vertical linear rectangular pipeline 7, above the detection window I11 and at the position corresponding to the high-speed injection valve I12, a sundries outlet I14 is arranged on the vertical linear rectangular pipeline 7 above the other side of the rejection notch I13 and obliquely above the other side, the sundry outlet I14 is connected with a sundry channel I16, an air blocking drum 15 which inclines upwards is arranged at the sundry inlet of the sundry channel I16, sundries enter the sundry channel I16 through the air blocking drum 15, the lower end of the sundry channel I16 is connected with a light sundry outlet air lock 37, the air blocking drum 15 arranged at the inlet of the sundry channel I16 can effectively prevent blown sundries and blown air flow from flowing back into the air supply pipeline 10, and therefore the light sundries can smoothly enter the sundry channel I16 to fall down and are discharged through the light sundry outlet air lock 37.

A second video cabinet 18 is arranged above a transverse straight line rectangular pipeline 29 on the air supply pipeline 10, a second camera 20 is fixed in the second video cabinet 18 through a support, the second camera 20 adopts a 3-CCD or 4-CCD color high-speed linear array camera, a second reflector 23 is arranged at the corresponding position of the second camera 20 through a support, the angle of the second reflector 23 relative to the second camera 20 can be adjusted, a second transparent glass 21 for dust prevention is arranged at the corresponding position of the second reflector 23 in the second video cabinet 18, a second illumination light source 22 is also fixedly arranged in the second video cabinet 18 through a support, the second illumination light source 22 adopts an LED linear light source, the number of the second illumination light sources is 2 to 4, a second background light source 19 is arranged at the other side of the transverse straight line rectangular pipeline 29 and the second video cabinet 18 through a support, the second background light source 19 adopts an LED linear light source, and a second high-speed injection valve 26 is arranged at the rear side of the second illumination light source 22, a second detection window 24 is arranged on the transverse straight line rectangular pipeline 29 at the corresponding position of the second camera 20 and the second reflector 23, the second detection window 24 is positioned at any position on the transverse straight line rectangular pipeline, the light source center of the second background light source 19 is positioned at the corresponding position of the second detection window 24, a second rejection notch 25 is also arranged on the transverse straight line rectangular pipeline 29, behind the second detection window 24 and at the position corresponding to the second high-speed injection valve 26, a second sundry outlet 27 is arranged on the transverse straight line rectangular pipeline 29 below the other side of the second rejection notch 25, the second sundry outlet 27 is connected with a second sundry channel 30, the lower end of the second sundry channel 30 is connected with a light sundry outlet air lock 37, light sundries sprayed by the second high-speed injection valve 26 are discharged through the light sundry outlet air lock 37, and the rear end of the transverse straight line rectangular pipeline 29 on the air conveying pipeline 10 is connected with a material-air separating device 31, video cabinet 1 keeps away from material gas separator 31 and sets up, there is tobacco leaf export air lock 36 material gas separator 31's lower extreme through the pipe connection, qualified tobacco leaf passes through the ejection of compact of tobacco leaf export air lock 36, material gas separator 31 sets up with centrifugal fan 33 integration, centrifugal fan 33's air-out pipeline 34 is connected to the front end of pneumatic conveying pipeline 10, the clean gas after will filtering sends back to pneumatic conveying pipeline 10 front end again, constitute wind-force circulation system, thereby realize the wind-force recycle in the whole pneumatic conveying pipeline 10, save power like this, also be favorable to the spectral detection, centrifugal fan 33 still with the help of its centrifugal function, through dust air-out pipeline 35 exhaust dust.

The first material detection and rejection area 8a and the second material detection and rejection area 8b are arranged on the same air conveying pipeline 10, the first material detection and rejection area 8a is located on a vertical straight line rectangular pipeline 7 of the air conveying pipeline 10, the vertical straight line rectangular pipeline 7 can be a vertical straight line rectangular pipeline perpendicular to the ground or an inclined straight line rectangular pipeline not perpendicular to the ground, materials in the area of the vertical straight line rectangular pipeline 7 are conveyed upwards, the second material detection and rejection area 8b is located on a transverse straight line rectangular pipeline 29 on the same air conveying pipeline 10, the transverse straight line rectangular pipeline 29 can be a horizontal straight line rectangular pipeline or an inclined straight line rectangular pipeline, and materials in the area of the transverse straight line rectangular pipeline 29 are conveyed transversely.

The utility model discloses a theory of operation is: the material with initial speed is fed through a feeding air lock 9 at one side of the lower end of an air conveying pipeline 10 and then is conveyed upwards in the air conveying pipeline 10, at the moment, impurities with large specific gravity such as stones and metal blocks and materials with large weight such as tobacco cake and tobacco mass directly fall to the bottom of the air conveying pipeline 10, a heavy impurity outlet air lock 39 is arranged at the bottom of the air conveying pipeline, and heavy impurities are discharged by a timing switch; the material continuously moves upwards to a first detection window 11 of a first detection and rejection area 8a, the color high-speed linear array camera scans and shoots material images on line through the action of a first lighting source 3, a first background light source 6 and a first reflector 4 to obtain the surface characteristics of the tobacco leaves, such as color, shape, size, texture and the like, the surface characteristics are analyzed and processed through an image processing board card and image processing software, the analysis and processing result is finally sent to a controller of a first high-speed injection valve 12, the first high-speed injection valve 12 is controlled by the controller to stand by, when the material moves to the injection position of the first high-speed injection valve 12, the first high-speed injection valve 12 is controlled by the controller to act, impurities and penicillium tobacco leaves which are not tobacco leaves are blown into an impurity channel 16 by compressed air and discharged through a light impurity outlet air lock 37, and the detected and rejected impurity-containing tobacco leaves continuously move forwards to a second detection window 24 of a second detection and rejection area 8b through a curve pipeline 17, repeating the previous detection and elimination process, blowing detected non-tobacco leaf sundries and penicillium tobacco leaves into the sundries channel II 30 and discharging the tobacco leaves through the light sundries outlet air lock 37, continuously advancing the qualified tobacco leaves after the two detection and elimination processes to the material-air separation device 31 for separating tobacco leaves, gas and tobacco dust, discharging the separated tobacco leaves through the tobacco leaf outlet air lock 36 to enter a designated position, separating and filtering the gas and the tobacco dust through the material-air separation device 31 and the centrifugal fan 33, discharging the tobacco dust through the dust discharge pipeline 35, and returning the filtered clean gas to the front end of the air supply pipeline 10 through the air outlet pipeline 34 for continuous use.

The above, only be a specific implementation manner of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is familiar with the technical field of the present invention in the technical scope disclosed by the present invention, according to the technical solution of the present invention and the utility model thereof, the concept of the present invention is equivalent to replace or change, and all should be covered in the protection scope of the present invention.

Claims

1. The utility model provides a wind send tobacco leaf to detect removing devices with twice function of rejecting, is including setting up video cabinet one (1), video cabinet two (18), wind send pipeline (10) and centrifugal fan (33) in the platform top, its characterized in that, wind send pipeline (10) to include: vertical sharp rectangle pipeline (7), curve pipeline (17) and horizontal sharp rectangle pipeline (29), wind send pipeline (10) lower extreme one side to be provided with feeding airlock (9) the lower extreme of wind send pipeline (10) is provided with heavy matter debris export airlock (39), video cabinet (1) sets up one side of vertical sharp rectangle pipeline (7), just video cabinet (1) faces the width direction of vertical sharp rectangle pipeline (7), video cabinet (1) is inside to be fixed with camera (2) through the support, camera (2) correspond the position and are fixed with reflector (4) through the support, the corresponding position of reflector (4) is provided with printing opacity glass (5), video cabinet (1) is inside to still fixedly be provided with illumination light source (3) through the support vertical sharp rectangle pipeline (7) with the opposite side of video cabinet (1) is provided with back of the body through the support A first scene light source (6), a first high-speed injection valve (12) is arranged above the first illumination light source (3), a first detection window (11) is arranged at the corresponding position of the first camera (2) and the first reflector (4) on the first vertical linear rectangular pipeline (7), the center of a light source of the first background light source (6) is positioned at the corresponding position of the first detection window (11), a first rejection notch (13) is further arranged at the position, corresponding to the first high-speed injection valve (12), above the first vertical linear rectangular pipeline (7), above the first detection window (11), on the other side of the first rejection notch (13), a first sundry outlet (14) is arranged on the vertical linear rectangular pipeline (7), the first sundry outlet (14) is connected with a first sundry channel (16), and the first sundry channel (16) is provided with an upward inclined air blocking drum (15) at the sundry inlet, the lower end of the sundries channel I (16) is connected with a light sundries outlet air lock (37), the video cabinet II (18) is arranged above the transverse straight line rectangular pipeline (29), a camera II (20) is fixed inside the video cabinet II (18) through a support, a reflector II (23) is fixed at the corresponding position of the camera II (20) through a support, a transparent glass II (21) is arranged at the corresponding position of the reflector II (23), a lighting source II (22) is also fixedly arranged inside the video cabinet II (18) through a support, a background light source II (19) is arranged at the other side of the transverse straight line rectangular pipeline (29) and the video cabinet II (18) through a support, a high-speed injection valve II (26) is arranged at the rear side of the lighting source II (22), and a light source II (23) is arranged at the corresponding position of the camera II (20) and the reflector II (23), A second detection window (24) is arranged on the transverse straight line rectangular pipeline (29), the light source center of the second background light source (19) is positioned at the corresponding position of the second detection window (24), a second rejection notch (25) is further arranged on the transverse straight line rectangular pipeline (29), behind the second detection window (24) and at the position corresponding to the second high-speed injection valve (26), a second sundry outlet (27) is arranged on the transverse straight line rectangular pipeline (29) below the other side of the second rejection notch (25), the second sundry outlet (27) is connected with a second sundry channel (30), the lower end of the second sundry channel (30) is connected with a light sundry outlet air lock (37), the rear end of the transverse straight line rectangular pipeline (29) is connected with a material-gas separating device (31), and the first video cabinet (1) is far away from the material-gas separating device (31), the lower extreme of material gas separator (31) has tobacco leaf export airlock (36) through the pipe connection, material gas separator (31) and centrifugal fan (33) integration set up, the front end that wind send pipeline (10) is connected to in air-out pipeline (34) of centrifugal fan (33), centrifugal fan (33) are through dust discharge pipeline (35) discharge offal dust.

2. The pneumatic tobacco leaf detection and removal device with the twice detection and removal functions as claimed in claim 1, wherein two detection and removal areas, namely a first material detection and removal area (8a) and a second material detection and removal area (8b), are arranged on the same pneumatic pipeline (10), the first material detection and removal area (8a) is located on the vertical linear rectangular pipeline (7) on the pneumatic pipeline (10), the vertical linear rectangular pipeline (7) is a vertical linear rectangular pipeline or an inclined linear rectangular pipeline, the second material detection and removal area (8b) is located on the same transverse linear rectangular pipeline (29) on the pneumatic pipeline (10), and the transverse linear rectangular pipeline (29) is a horizontal linear rectangular pipeline or an inclined linear rectangular pipeline.

3. The pneumatic tobacco leaf detection and removal device with the double detection and removal functions as claimed in claim 2, wherein the second detection window (24) of the second material detection and removal area (8b) is located at any position on a transverse straight-line rectangular pipeline (29) on the pneumatic pipeline (10).

4. The pneumatic tobacco leaf detection and removal device with the double detection and removal functions as claimed in claim 1, wherein the first detection window (11) is arranged in an open mode or in a shielding mode through a transparent material, and the first video cabinet (1) and the first detection window (11) are arranged in a sealing mode.

5. The pneumatic tobacco leaf detection and removal device with the double detection and removal functions as claimed in claim 1, wherein the second detection window (24) is arranged in an open mode or in a shielding mode through a transparent material, and the second video cabinet (18) and the second detection window (24) are arranged in a sealing mode.