Protective device and security inspection system having the same

Abstract

The present application discloses a protective device and a security inspection system having the same, the protective device comprising: at least one conveying mechanism for conveying a tray and / or an article to be inspected of the security inspection system; a protective medium comprising a first part and a second part, the first part being configured to be conveyed to the inner surface of the tray to separate the article to be inspected from the tray; a medium support configured to carry the second part of the protective medium so that the second part can rotate; and at least one medium conveying mechanism configured to be arranged extending along the conveying direction of the first part of the protective medium so as to convey the first part of the protective medium to the tray in a linear motion. The protective device can automatically protect the tray in the security inspection system.

Description

Background Art

[0002] The background description provided here is to generally present the background of the present application. To the extent described in this background section, the work of the presently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art against the present application.

[0003] When passengers undergo security checks at various locations such as airports and train stations, their carry-on luggage and scattered personal belongings are directly placed in a tray of a security inspection system that has no protection or safeguard. The tray passes through the security inspection system, and the security inspector uses a security inspection machine (X-ray inspection) to determine whether the luggage is safe. The security inspection system distinguishes between safe luggage and suspicious luggage. Safe luggage is handed over to passengers for collection, and suspicious luggage is placed at the bag opening area by security inspectors, who instruct the corresponding passengers to open the bag for inspection.

[0004] Currently, the trays in the baggage inspection systems on the market are not cleaned and protected. Hand luggage and loose items are placed directly in the trays on the sorting position, which can easily cause contamination of luggage and loose items. The trays will become dirty after repeated use, such as liquid spillage, etc., and some security inspection sites require passengers to take off their shoes for security inspection. If the shoes are also placed directly in the tray, it will be even dirtier, which is easy to contaminate the tray and the clothes in the tray.

[0005] Therefore, a device for automatically protecting a pallet is urgently needed. Summary of the invention

[0006] Therefore, the present application provides a protective device for a security inspection system to solve various problems that may exist in the prior art.

[0007] The present application provides a protective device for a security inspection system, comprising: at least one conveying mechanism for conveying a tray and / or items to be inspected of the security inspection system; a protective medium, comprising a first part and a second part, the first part being configured to be conveyed to the inner surface of the tray to separate the items to be inspected from the tray; a medium support, configured to carry the second part of the protective medium so that the second part can rotate; and at least one medium conveying mechanism, configured to be arranged extending along the conveying direction of the first part of the protective medium to convey the first part of the protective medium to the tray in a linear motion.

[0008] In an embodiment of the present application, the at least one medium conveying mechanism includes an active conveyor belt and a driven conveyor belt arranged relatively to each other, and the active conveyor belt and the driven conveyor belt are configured to: during the conveying operation, the protective medium is clamped therebetween, and when the conveying stops, the active conveyor belt and / or the driven conveyor belt can rotate an angle so that the protective medium can move in a direction perpendicular to the conveying direction.

[0009] In an embodiment of the present application, the medium conveying structure further includes at least one medium clamp, and the medium clamp is configured to be located on the same side or the other side of the tray relative to the medium support and is arranged perpendicular to the conveying direction.

[0010] In an embodiment of the present application, the protective device further comprises a medium cutting mechanism arranged perpendicular to the conveying direction, the medium cutting mechanism comprises a cutting knife and a cutting roller, and the cutting roller is provided with a narrow groove along its axial direction to cooperate with the conveying cutting knife.

[0011] In an embodiment of the present application, the protective medium has at least one imprint, and the imprint includes a straight line perpendicular to the conveying direction and / or a curve matching the bottom of the tray.

[0012] In an embodiment of the present application, the distance between the two adjacent straight line impressions is greater than the sum of the length of the tray and the depth of the two trays.

[0013] In an embodiment of the present application, the protection device further comprises a pallet lifting mechanism, which is configured to be located at a side of the at least one conveying mechanism and is used to lift the pallet to a height of the at least one conveying mechanism.

[0014] In an embodiment of the present application, the protective device further comprises at least one pair of medium driving mechanisms disposed between the medium support and the at least one medium transport mechanism, and the pair of medium driving mechanisms comprises a driving wheel and a driven wheel.

[0015] In an embodiment of the present application, the protection device further includes at least one pair of guide mechanisms, and the at least one pair of guide mechanisms is located between the at least one pair of medium driving mechanisms and the at least one medium conveying mechanism.

[0016] In an embodiment of the present application, the medium conveying structure further includes at least one rotating shaft and a plurality of supporting members, at least one of the plurality of supporting members is connected to the driven conveyor belt and can rotate 180 degrees around the at least one rotating shaft.

[0017] In an embodiment of the present application, the medium transport structure further includes a tray placement mechanism, and the tray placement mechanism is configured to be located on a side of the at least one conveying mechanism for placing the tray.

[0018] The present application also provides a baggage security inspection system, comprising the protective device as described above.

[0019] The protective device of the present application can not only automatically lay protective media on the trays in the security inspection system, thereby protecting the trays and protecting the passengers' personal belongings from contamination, but also has the characteristics of simple structure and convenient operation. In addition, the changes made to the existing security inspection transmission system are relatively small, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present application will be more fully understood from the detailed description and the accompanying drawings. These drawings illustrate one or more embodiments of the present application and, together with the written description, are used to explain the principles of the present application. Wherever possible, the same reference numerals are used throughout the drawings to represent the same or similar elements of the embodiments, and among them:

[0021] Figure 1 is a schematic perspective view of a security inspection system with a protective device according to an exemplary embodiment of the present application.

[0022] Figure 2 is a schematic perspective view of a security inspection system with a protective device according to an exemplary embodiment of the present application, wherein the tray is raised to the height of the second-layer conveying rollers.

[0023] Figure 3 is a schematic perspective view of a medium transport mechanism according to an exemplary embodiment of the present application.

[0024] Figure 4 is a schematic perspective view of a conveyor belt rotation 180 according to an exemplary embodiment of the present application.

[0025] Figure 5 is a schematic perspective view of a media trimming mechanism according to an exemplary embodiment of the present application.

[0026] Figure 6 is a schematic perspective view of a tray lifting mechanism according to an exemplary embodiment of the present application.

[0027] Figures 7A-7C is a partial schematic perspective view of a security inspection system with a protective device according to another exemplary embodiment of the present application.

[0028] Figure 8 is a partial schematic perspective view of a security inspection system with a protective device according to yet another exemplary embodiment of the present application. DETAILED DESCRIPTION

[0029] Hereinafter, the present application will be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the present application are shown. However, the present application can be implemented in different embodiments and should not be construed as being limited to the embodiments described herein. These embodiments provided by the present application are to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, for clarity, the thickness and region of the layer may be magnified. Throughout the specification, the same reference numerals are used to represent the same elements. For different embodiments, elements may have different relationships and different positions.

[0030] Figure 1 is a schematic diagram of a security inspection system with a protective device 1 according to an exemplary embodiment of the present application, Figure 2 1 is a schematic perspective view of a security inspection system with a protective device 1 according to an exemplary embodiment of the present application, wherein the tray 100 is raised to the height of the second layer of conveyor rollers. Figure 1 and Figure 2 As shown, the protection system can automatically lay a protective medium on a tray 100 containing carry-on luggage or small luggage, thereby protecting the tray 100.

[0031] In this embodiment, the protective device 1 for the security inspection system includes: at least one conveying mechanism 10, used to convey the tray 100 and / or the items to be inspected of the security inspection system; a protective medium 20, including a first part 21 and a second part 22, the first part 21 being configured to be conveyed to the inner surface of the tray 100 to separate the items to be inspected from the tray 100; a medium support 30, configured to carry the second part 22 of the protective medium 20 so that the second part 22 can rotate; and at least one medium conveying mechanism 50, configured to be arranged extending along the conveying direction of the first part 21 of the protective medium to convey the first part 21 of the protective medium 20 to the tray 100 in a linear motion.

[0032] In the illustrated embodiment, the conveying mechanism 10 includes a frame 110, a first layer of conveying rollers 120 supported by the frame 110, and a second layer of conveying rollers 130. The first layer of conveying rollers 120 and the second layer of conveying rollers 130 can both convey the passenger's items to be inspected and / or the tray to the security inspection equipment. The arrangement of two layers of conveying rollers can not only convey more carry-on luggage or small luggage, but also separate the tray and the luggage to further avoid mutual contamination. Each layer of conveying rollers can include an electric roller 140 and a plurality of driven rollers 150, the electric roller 140 can be driven by a servo motor, and the rollers can be connected by a transmission belt 160.

[0033] In other embodiments, the first layer of conveyor rollers 120 can be used to convey the pallets and luggage to be inspected, and the second layer of conveyor rollers 130 can be used to convey the protected pallets 100. The conveying mechanism in the embodiment of the present application can be implemented by existing conveyor rollers in the existing mechanism, or by existing conveyor belts in the existing mechanism, and the present application does not limit this.

[0034] In the embodiment of the present application, the protective medium can be implemented by paper, and the protective medium can be stored in the form of a roll, that is, the first part 21 of the protective medium. When the protective medium is unfolded and located above the tray 100, it is in an unfolded flat state, that is, the second part 22 of the protective medium. In this article, the longitudinal direction of the protective medium is the same as its conveying direction, the transverse direction is the width direction, that is, the direction perpendicular to the longitudinal direction, and the medium direction is the direction of the plane where the medium itself is located.

[0035] Those skilled in the art will appreciate that the first portion 21 and the second portion 22 of the protective medium are only for convenience of description and are not intended to limit the protective medium. For example, when the protective medium is in the form of a roll on the support, it is the first portion 21, and when it is unrolled and transported above the tray 100 during operation, it becomes the second portion 22. In other words, the first portion 21 of the protective medium rotates around the medium support, and the second portion 22 of the protective medium moves linearly under the guidance of the medium conveying mechanism.

[0036] The protective medium may also be pre-embossed with a mark that is easy to cut, fold or tear, and the mark may match the shape of the tray, that is, the mark may include a straight line perpendicular to the longitudinal direction of the protective medium and / or a curve that matches the bottom of the tray. In other words, the mark of the protective medium is mainly convenient for cutting off the second part of the protective medium. Preferably, the distance between two adjacent marks perpendicular to the longitudinal direction of the protective medium is greater than the sum of the length of the tray and the two depths of the tray, so that a piece of the protective medium that is cut off can fully cover the entire tray, especially the two side tops of the tray, so that passengers can also prevent direct contact with the tray when grasping it.

[0037] In other embodiments, the protective medium may also include a flexible film or a plastic medium, or other materials that can be laid and easily cut.

[0038] In the embodiment of the present application, the medium support 30 is configured to carry the protective medium and enable the protective medium to rotate, thereby facilitating the unfolding of the protective medium. For example, the medium support 30 includes a support shaft and a motor (not shown) mounted on the frame of the conveying mechanism 10. The support shaft can be driven by the motor and inserted into the protective medium arranged in a roll shape, so as to facilitate the unfolding of the protective medium.

[0039] In an embodiment of the present application, the protection device 1 may further include a pallet placement mechanism 40, which is configured to be located at the side of the at least one conveying mechanism 10, for placing the pallet 100. The pallet placement mechanism 40 may include a placement device located at the side of the conveying mechanism 10. In other embodiments, the pallet placement mechanism 40 may also be implemented by the second layer of conveying rollers 130.

[0040] In the embodiments of the present application, Figure 3 As shown, the medium conveying mechanism 50 includes an active conveyor belt 51 and a driven conveyor belt 52 arranged opposite to each other. The active conveyor belt 51 and the driven conveyor belt 52 are configured to be arranged on opposite sides of the protective medium along the longitudinal extension of the second part 22 of the protective medium (i.e., the unfolded protective medium), respectively. For example, the active conveyor belt 51 is arranged below the protective medium, and the driven conveyor belt 52 is arranged above the protective medium. The two conveyors use electrostatic action to convey the protective medium to the tray 100. The protective medium between the active conveyor belt 51 and the driven conveyor belt 52 moves linearly. As shown in the figure, the active conveyor belt 51 and the driven conveyor belt 52 are arranged at the edge portion of the protective medium in the transverse direction. The active conveyor belt 51 and the driven conveyor belt 52 can be arranged symmetrically. Taking the active conveyor belt 51 as an example, the active conveyor belt can include a conveyor belt 54 and shafts located at both ends of the conveyor belt. The shaft can be driven by a motor. The conveyor belt 54 extends from one end of the protective medium in the longitudinal direction to the other end, so that the active conveyor belt can convey the protective medium 20 more smoothly. The driven conveyor belt can be set up in the same way as the driving conveyor belt.

[0041] In other embodiments, the medium conveying mechanism may be arranged only along a portion of the longitudinal direction of the protective medium. In other embodiments, an active conveyor belt and a driven conveyor belt may be arranged on both sides of the lateral direction of the protective medium. The present application does not limit the number of medium conveying mechanisms. The conveyor belt in this embodiment may also utilize a known structure.

[0042] In the embodiments of the present application, Figure 3 and Figure 4As shown, during the operation of the active conveyor belt 51 and the driven conveyor belt 52, the protective medium 20 is clamped therebetween, and the protective medium 20 is conveyed forward by friction. When the active conveyor belt 51 and the driven conveyor belt 52 stop operating, the driven conveyor belt 52 will rotate an angle from the direction shown in the figure, preferably 180 degrees, so that the driven conveyor belt 52 is separated from the protective medium 20, so that the protective medium 20 can move in a direction perpendicular to the conveying direction, such as upward. In other words, driven by the motor, the support member 55 of the driven conveyor belt 52 rotates from the top of the protective medium to the outside of the protective medium around the rotating shaft 56 to release the protective medium from the clamped state. In more detail, the motor (not shown in the figure) drives the rotating shaft 56 to rotate 180 degrees, and the support member 55 connected to the shaft of the driven conveyor belt can rotate around the rotating shaft 56, so that the support member 55 rotates to the lower part of the protective medium so that the tray is pushed upward to the second layer of conveying rollers 130. In this embodiment, the support member can be bent 90 degrees to better enable the driven transmission belt 52 to rotate away from the protective medium.

[0043] In other embodiments, the driven conveyor belt may not rotate at a certain angle, but the driving conveyor belt may realize the rotation, or both the driving conveyor belt and the driven conveyor belt may rotate at a certain angle.

[0044] In this embodiment, the medium conveying structure may further include one or more medium clamps 53. Figure 2 As shown, the medium holder 53 may be located on both sides of the tray 100 and separated from the tray 100 by a certain distance. In other words, the medium holder 53 may be located between the medium conveying structure 50 and the medium support member 30 in the moving direction of the protective medium. Figure 1 As shown, the media clamps 53 can also be rollers arranged in pairs, and placed flush with the top of the tray 100. One of the media clamps 53 can squeeze the other media clamp 53 under the action of a cylinder or a motor, so as to firmly clamp the protective medium.

[0045] In other embodiments, the medium holder 53 may protrude from the frame of the conveying mechanism 10 and be arranged along a direction perpendicular to the conveying direction of the protective medium. Two medium holders may also be provided, which are respectively located on both sides of the frame of the tray 100, or only one medium holder may be provided, which is located at the front end of the protective medium in the conveying direction of the protective medium, that is, at the side of the tray where the medium support member 30 is not provided.

[0046] In this embodiment, if Figure 4-5As shown, the protective device 1 also includes a medium cutting mechanism 60 arranged perpendicular to the conveying direction. The medium cutting mechanism 60 includes a cutting knife 61 and a cutting roller 62. The medium cutting mechanism 60 can be arranged on the frame of the conveying mechanism 10, or one end of the cutting roller 62 is fixed to the frame of the conveying mechanism 10 and protrudes from the frame, perpendicular to the longitudinal direction of the protective medium. The cutting roller 62 is provided with a narrow groove 63 along its axial direction to cooperate with the cutting knife 61. The cutting knife 61 can be driven by a motor to reciprocate in the narrow groove 63 of the cutting roller 62 to cut the first part 21 and the second part 22 of the protective medium. The cutting knife 61 can cut the protective medium in the first movement, and no cutting operation is performed when returning, or cutting is still performed when returning to ensure that the protective medium is completely cut.

[0047] In this embodiment, the protection device further includes a tray lifting mechanism 70, such as Figure 6 As shown, the pallet lifting mechanism 70 is located at the side of the conveying mechanism 10 and connected to the frame of the conveying mechanism 10, and is used to lift the pallet 100 from the first layer of conveying rollers 120 to the second layer of conveying rollers 130 or a position slightly higher than the second layer of conveying rollers 130, so as to facilitate moving the pallet 100 to the second layer of conveying rollers 130. Figure 6 As shown, the pallet lifting mechanism 70 mainly includes a servo motor 71, a synchronous pulley 72, a synchronous belt 73, a pallet 74, a linear guide rail 75, an upper limiter 77 on a main frame 76, and a lower limiter 78. The main frame 76 can be connected to the frame of the conveying mechanism 10. When the servo motor 71 is turned on, the servo motor 71 drives the synchronous pulley 72 to move, and the synchronous pulley 72 and the synchronous belt 73 drive the pallet 74 to move up and down along the linear guide rail 75. The present application does not limit the connection method between the synchronous pulley 72 and the pallet 74. The position of the pallet 75 moving up and down can be limited by the upper and lower limiters 77 and 78.

[0048] In this embodiment, if Figure 3-5 As shown, the protection device 1 further includes at least one pair of medium driving mechanisms 80, which are arranged on the same side as the medium support 30 and are located above the medium support 30 to facilitate the upward conveyance of the protection medium. The medium driving mechanism 80 can be driven by a motor and can be implemented as a driving wheel and a driven wheel, for example, the motor is connected to the driving wheel to drive the medium conveying operation.

[0049] In this embodiment, the protection device 1 further includes two pairs of guide mechanisms 90, which can be driven by a motor and can be implemented as a driving wheel and a driven wheel. The guide mechanism 90 obtains the protection medium from the medium driving mechanism 80 and sends it to the medium conveying mechanism 50, or the guide mechanism 90 conveys the protection medium from the medium driving mechanism 80 to a position close to the medium holder, so that the protection medium can smoothly reach the medium conveying mechanism 50.

[0050] In other embodiments, only one pair of guide mechanisms 90 may be provided. For example, a pair of guide mechanisms 90 may be provided between the medium driving mechanism 80 and the medium conveying mechanism 50 on the side where the medium support 30 is provided, along the lateral direction of the protective medium. Alternatively, two pairs of guide mechanisms 90 may be provided between the medium driving mechanism 80 and the medium conveying mechanism 50 and between the medium conveying mechanism 50 and the medium holder on the other side where the medium support 30 is not provided, or four pairs of guide mechanisms 90 may be provided between the medium driving mechanism 80 and the medium conveying mechanism 50 and between the medium conveying mechanism 50 and the medium holder along the width direction of the protective medium. The guide mechanism may have a driving force or may not have a driving force. In this case, the driving force for conveying the medium is mainly provided by the medium driving mechanism, and the guide mechanism mainly serves to guide the medium.

[0051] The operation of the protection device 1 will be described below with reference to the drawings.

[0052] like Figure 1-6 As shown, when the protective device 1 is started, the tray lifting mechanism 70 lifts the tray 100 from the first layer of conveying rollers 120 to the second layer of conveying rollers 130. At this time, the medium support 30 rotates under the drive of the motor, driving the protective medium to unfold from the roll form and move upward with the help of the medium driving mechanism 80. The guide mechanism 90, driven by the motor, clamps the protective medium from the medium driving mechanism 80 and transfers it to the medium conveying mechanism 50. The protective medium passes through the medium clamp 53 and is conveyed to the medium conveying mechanism 50. Then, the medium conveying mechanism 50 guides the protective medium to continue to move forward with the help of friction and transfers it to the top of the tray 100. When the guide mechanism and the medium clamp 53 are also provided on the other side opposite to the medium support 30, as the protective medium continues to move forward, the guide mechanism 90 and the medium clamp located on the other side also clamp the protective medium. At this time, the tray lifting mechanism 70 raises the tray 100 so that the bottom of the tray 100 is flush with the second layer of conveying rollers 130. When the tray lifting mechanism 70 stops moving, the conveying of the protective medium also stops, and the medium clamps 53 located at both ends of the tray 100 clamp and fix the protective medium. Then, driven by the motor, the medium cutting mechanism 60 cuts the protective medium from one side of the protective medium in a direction perpendicular to the conveying direction. After that, the medium clamp 53 releases the protective medium 20, so that the protective medium 20 can completely cover the tray 100, thereby protecting the tray 100. The passenger can place the protected tray 100 on the baggage conveying mechanism.

[0053] The protective device in the present application can be arranged together with the baggage security inspection system to provide a clean and hygienic luggage tray when passengers undergo security inspection.

[0054] In an alternative embodiment of the present application, the protective device can be set in the security inspection system. In order to more clearly illustrate the principle of the present application, some supporting structures are omitted. Figures 7A-7C As shown, the medium support 30 is arranged above the conveying mechanism 10 such as a baggage conveyor belt through a supporting structure (not shown). The tray 100 moves forward with the baggage conveyor belt, and the protective medium 20 is naturally laid on the tray under the guidance of the medium conveying mechanism 50. After the protective medium 20 completely covers the tray, it is cut by the medium cutting mechanism, and the protective medium falls into the tray 100 and covers the inner surface of the tray, thereby protecting the tray and protecting the personal belongings of the passengers from contamination.

[0055] In other alternative embodiments, Figure 8 As shown, a medium support 30 and a protective medium 20 may also be provided on a tray placement mechanism beside a conveying mechanism 10 such as a luggage conveyor belt, and when a passenger needs it, the protective medium may be manually drawn out and laid inside the tray 100 .

[0056] although Figures 1 to 8 Specific embodiments of the guard are shown and described, but those skilled in the art will appreciate that what is discussed herein may be replaced by other components capable of performing the function, and regardless of the exact method used to connect the components to each other.

[0057] The terms used here are only for the exemplary purposes of the present application and should not be interpreted as limiting the meaning or scope of the present application. As used in this specification, unless a specific example is clearly indicated in the context, the singular form may include the plural form. Moreover, the expressions "including" and / or "including" used in this specification neither limit the shapes, numbers, steps, actions, operations, components, elements and / or their groups mentioned, nor exclude the occurrence or addition of one or more other different shapes, numbers, steps, operations, components, elements and / or their groups, or the addition of these. For ease of description, spatially related terms such as "above...", "above...", "upper", "under...", "under...", "below...", "lower", etc. are used here to describe the relationship between an element or feature as shown in the figure and another element (element) or a feature (feature). It should be understood that, in addition to the orientation illustrated in the figure, spatially related terms are intended to include different orientations of devices (such as packaging) in use or operation. For example, if the device in the figure flips, the element described as below, below or below other elements or features is oriented above or above another element or feature. Thus, the exemplary term "over" can include both an orientation of "above" and "below."

[0058] As used herein, terms such as "first", "second", etc. are used to describe various components, assemblies, regions, layers and / or parts. However, it is obvious that components, assemblies, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one component, assembly, region, layer or part from another component, assembly, region, layer or part. Therefore, the description of the first component, assembly, region, layer or part may also refer to the second component, assembly, region, layer or part without departing from the scope of the present application.

[0059] The above description of the exemplary embodiments of the present application is presented only for the purpose of illustration and description, and is not intended to be exhaustive or limit the present application to the precise form disclosed. In accordance with the above teachings, many modifications and variations are possible. The embodiments are selected and described to explain the principles of the present disclosure and its practical application, so that other technical personnel in the field can utilize the present disclosure and various embodiments, and have various modifications suitable for the specific purposes contemplated. Without departing from the spirit and scope of the present disclosure, replacement embodiments will become apparent to those skilled in the art to which the present disclosure belongs. Therefore, the scope of the present disclosure is limited by the appended claims rather than by the foregoing description and the exemplary embodiments described therein.

Claims

1. A protective device for a security inspection system, characterized in that: include: At least one conveying mechanism, used for conveying the pallet of the security inspection system and / or the items to be inspected; a protective medium, comprising a first portion and a second portion, wherein the first portion is configured to be delivered to an inner surface of the tray to isolate the object to be inspected from the tray; a medium support configured to carry the second portion of the protective medium so that the second portion can rotate; At least one medium conveying mechanism is configured to be arranged extending along the conveying direction of the first part of the protective medium to convey the first part of the protective medium to the tray, wherein the at least one medium conveying mechanism includes an active conveyor belt and a driven conveyor belt arranged relatively to each other, and the active conveyor belt and the driven conveyor belt are configured to: during the conveying operation, clamp the protective medium therebetween, and when the conveying stops, the active conveyor belt and / or the driven conveyor belt can rotate an angle so that the protective medium can move in a direction perpendicular to the conveying direction.

2. The protective device according to claim 1, wherein: The medium transport structure further includes at least one medium holder, which is configured to be located on the same side or the other side of the tray relative to the medium support and disposed perpendicularly to the transport direction.

3. The protective device according to claim 2, wherein: The protection device also includes a medium cutting mechanism arranged perpendicular to the conveying direction, the medium cutting mechanism includes a cutting knife and a cutting roller, and the cutting roller is provided with a narrow groove matched with the conveying cutting knife along its axial direction.

4. The protective device according to any one of claims 1 to 3, wherein: The protective medium has at least one impression, which includes a straight line perpendicular to the conveying direction and / or a curve matching the bottom of the tray.

5. The protective device according to claim 4, wherein: The distance between two adjacent straight line impressions is greater than the sum of the length of the tray and the depth of the two trays.

6. The protective device according to claim 1, wherein: The guard device further comprises a pallet lifting mechanism, which is configured to be located at a side of the at least one conveying mechanism and is used to lift the pallet to a height of the at least one conveying mechanism.

7. The protective device according to claim 6, wherein: The guard device also includes at least one pair of media drive mechanisms disposed between the media support and the at least one media transport mechanism. 8 . The protection device according to claim 7 , further comprising at least one pair of guide mechanisms, wherein the at least one pair of guide mechanisms are located between the at least one pair of medium driving mechanisms and the at least one medium transporting mechanism.

9. The protective device according to any one of claims 1 to 3, wherein: The media conveying structure further includes at least one rotating shaft and a plurality of supports, at least one of the plurality of supports being connected to a driven conveyor belt of the at least one media conveying mechanism and being capable of rotating 180 degrees around the at least one rotating shaft.

10. The protective device according to any one of claims 1 to 3, wherein: The protection device further comprises a pallet placement mechanism, which is configured to be located at a side of the at least one conveying mechanism and is used for placing the pallet.

11. A baggage security inspection system, comprising the protection device according to any one of the above claims.

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