Detection channel for security check CT (Computed Tomography) and composite board structure thereof
By using a PMI foam layer as the core layer in the channel composite board, and covering it with a carbon fiber layer on the outside and an aramid fiber layer on the inside, combined with adhesive bonding, the problem of balancing the stiffness and X-ray transmittance of the detection channel assembly was solved, and a detection channel with high stiffness and high transmittance was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI WUYING TECH CO LTD
- Filing Date
- 2025-05-09
- Publication Date
- 2026-05-08
AI Technical Summary
In the prior art, the detection channel of the CT detection channel made of carbon fiber material has difficulty in balancing the stiffness and radiation transmittance, resulting in poor radiation penetration.
The stiffness and X-ray transmittance of the detection channel component using PMI foam layer as core layer are difficult to balance, resulting in poor X-ray penetration.
By using a PMI foam layer as the core layer in the channel composite board, and covering it with a carbon fiber layer on the outside and an aramid fiber layer on the inside, combined with adhesive bonding, a balance between high stiffness and high transmittance is achieved, extending the service life of the channel.
Smart Images
Figure CN224216596U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of detection channel technology, and in particular to a detection channel for security CT and its composite plate structure. Background Technology
[0002] For security CT scanners, the detection channel is one of the most important components, providing transport space for the object being inspected. The detection channel consists of a basic channel and a channel assembly. The channel assembly is open at both ends and connects to the basic channel, forming a continuous channel. The basic channel absorbs radiation emitted by the X-ray source or scattered by the object being inspected, preventing radiation leakage. The channel assembly allows radiation emitted by the X-ray source to pass through one side of the assembly, then through the object being inspected, and finally exit from the other side of the assembly, where it is absorbed by the detector, thus achieving CT imaging.
[0003] The structural strength and X-ray transmittance of the CT detection channel directly affect the smoothness of the movement of the object under test and the detection effect of the X-ray. Common material choices and connection methods for channel components in existing technologies are as follows: The most common method is to use carbon fiber composite material (multi-layer carbon fiber combined with cyclic resin) to make the CT detection channel. To ensure sufficient rigidity, the total thickness of the carbon fiber is often large, resulting in relatively poor X-ray transmittance. Therefore, it is necessary to develop a CT detection channel that can ensure rigidity, has a suitable volume, and achieve high transmittance. Utility Model Content
[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a detection channel for security CT scans.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] The detection channel for security CT includes a channel body that is generally channel-shaped. The two ends of the channel body are used to connect to the base channel. The base channel is connected to the cavity of the channel body to allow the object to be tested to pass through. The channel body is composed of a channel composite plate. The edge of the channel body is connected to the base channel through connecting plates and fasteners.
[0007] The channel composite panel includes a PMI foam layer, the outer side of which is covered with a carbon fiber layer, and the carbon fiber layer located inside the channel body is covered with an aramid fiber layer.
[0008] Preferably, the channel body is an integral structure composed of channel composite panels.
[0009] Preferably, the main body of the channel is composed of four channel composite panels, with the channel composite panels on corresponding sides having the same size, symmetrically distributed in pairs, and spliced together to form a "U" shaped channel.
[0010] Preferably, the main body of the channel is composed of four identical L-shaped channel composite panels, which are symmetrically distributed and spliced together to form a "U"-shaped channel.
[0011] Preferably, a composite panel structure is applied to the aforementioned detection channel for security CT scans. The main body of the channel is made of a channel composite panel using this composite panel structure. The channel composite panel includes a PMI foam layer, the outer side of which is covered with a carbon fiber layer, and the carbon fiber layer located on the inner side of the channel body is covered with an aramid fiber layer.
[0012] Preferably, the thickness of the PMI foam layer is 3-7 mm, the thickness of the carbon fiber layer is 0.1-0.5 mm, and the thickness of the aramid fiber layer is 0.1-0.5 mm.
[0013] Preferably, the channel composite plate is flat, and stepped through holes are provided at the edges of both sides of the channel composite plate. A reinforcing block is provided on the inner wall of the stepped through hole, and an adhesive layer is provided between the reinforcing block and the inner wall of the stepped through hole.
[0014] Preferably, the transverse cross-section of the channel composite plate is convex, a boss is provided on the inner side of the channel composite plate, a columnar through hole is opened at the edge of the stepped part of the channel composite plate, and an adhesive layer is provided on the inner wall of the stepped through hole of the composite plate.
[0015] The beneficial effects of this utility model are as follows:
[0016] 1. The detection channel proposed in this utility model uses a PMI foam layer as the core layer, which can improve the rigidity of the channel composite plate. At the same time, the density of the core layer is lower than that of carbon fiber, which allows the radiation to penetrate the detection channel better. The carbon fiber layer is covered on the surface of the PMI foam layer and the two are bonded together with adhesive, so that the channel composite plate can meet the requirements of rigidity and strength at the same time. In addition, the working surface of the carbon fiber layer (the surface facing the inside of the channel) is covered with aramid fiber, which can enhance the surface wear resistance of the channel composite plate and improve its service life.
[0017] 2. The detection channel proposed in this utility model has its main body connected to the basic channel at the edge by a connecting plate and fasteners. The connecting plate is flat, which can effectively reduce the diameter of the channel without affecting the passage of items or conveyor belts. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of the channel composite plate proposed in this utility model;
[0019] Figure 2 This is a three-dimensional structural diagram of the channel composite plate proposed in this utility model;
[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the stepped through hole in the composite plate of the channel composite plate proposed in this utility model;
[0021] Figure 4 This is a schematic diagram of a partial structure of the stepped through-holes in the composite plate of the channel composite plate proposed in this utility model. Figure 1 ;
[0022] Figure 5 This is a partial structural diagram of the stepped through-holes in the composite plate structure proposed in this utility model. Figure 2 ;
[0023] Figure 6 This is a schematic diagram of the cross-sectional structure of the channel composite plate II proposed in this utility model;
[0024] Figure 7 This is a three-dimensional structural diagram of the channel composite plate II proposed in this utility model;
[0025] Figure 8 This is a schematic diagram of the cross-sectional structure of the columnar through hole in the composite plate of the second channel composite plate proposed in this utility model;
[0026] Figure 9 This is a partial structural diagram of the columnar through-hole in the composite plate of the second channel composite plate proposed in this utility model;
[0027] Figure 10 This is a schematic diagram of the two-piece splicing structure of the channel composite panel proposed in this utility model. Figure 1 ;
[0028] Figure 11 This is a schematic diagram of the two-piece splicing structure of the channel composite panel proposed in this utility model. Figure 2 ;
[0029] Figure 12 This is a three-dimensional structural diagram of the detection channel for security CT scanner proposed in this utility model;
[0030] Figure 13 This is a schematic diagram of the main view structure of the detection channel for security CT scanner proposed in this utility model;
[0031] Figure 14 This is a schematic diagram of the connection structure of the channel body, basic channel, and connecting plate proposed in this utility model. Figure 1 ;
[0032] Figure 15 This is a schematic diagram of the connection structure of the channel body, basic channel, and connecting plate proposed in this utility model. Figure 2 .
[0033] In the diagram: 1. Main channel body; 2. Basic channel; 3. Connecting plate; 31. First connecting plate; 32. Second connecting plate.
[0034] 101. Composite plate with channel; 102. Composite plate with stepped through holes; 103. Boss; 104. Composite plate with columnar through holes.
[0035] 1001 PMI foam layer, 1002 carbon fiber layer, 1003 aramid fiber layer, 1004 adhesive layer, 1005 reinforcement section. Detailed Implementation
[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0037] Reference Figure 1-15 The detection channel for security CT includes a channel body 1 that is generally channel-shaped. The two ends of the channel body 1 are connected to the basic channel 2. The basic channel 2 is connected to the cavity of the channel body 1, allowing the object to be tested to pass through. The channel body 1 is composed of a channel composite plate 101. The edge of the channel body 1 is connected to the basic channel 2 through a connecting plate 3 and fasteners.
[0038] The channel composite panel 101 includes a PMI foam layer 1001, the outer side of which is covered with a carbon fiber layer 1002, and the carbon fiber layer 1002 located inside the channel body 1 is covered with an aramid fiber layer 1003.
[0039] In Option 1, the main body of the channel 1 is an integrated structure composed of channel composite panels 101. The integrated structure has higher strength, but the manufacturing cost is relatively high.
[0040] In Option 2, the main body of the passage 1 consists of four passage composite panels 101. The passage composite panels 101 on corresponding sides are of the same size and are symmetrically distributed in pairs, splicing together to form a "U"-shaped passage, as shown below. Figure 10 As shown.
[0041] In Option 3, the main body of the channel 1 consists of four identical L-shaped channel composite panels 101, which are symmetrically distributed and spliced together to form a "U"-shaped channel, as shown below. Figure 11 As shown.
[0042] In options one through three, using four identical L-shaped channel composite panels 101 requires only one mold, making it cheaper than a single-piece design. Using four flat channel composite panels 101 requires only one mold if the channel is square, as all four panels are identical. However, if the channel is rectangular, each of the top and bottom panels and the left and right panels requires a separate mold. The mold cost for two flat panels is cheaper than for L-shaped ones, but it increases the number of parts.
[0043] A composite panel structure is applied to the aforementioned detection channel for security CT scans. The channel body 1 is made of a channel composite panel 101 using this composite panel structure. The channel composite panel 101 includes a PMI foam layer 1001, with a carbon fiber layer 1002 covering the outer side of the PMI foam layer 1001. An aramid fiber layer 1003 covers the carbon fiber layer 1002 located on the inner side of the channel body 1.
[0044] The thickness of the PMI foam layer 1001 is 3-7mm, the thickness of the carbon fiber layer 1002 is 0.1-0.5mm, and the thickness of the aramid fiber layer 1003 is 0.1-0.5mm.
[0045] like Figure 1-5 As shown, the channel composite panel 101 is flat. Stepped through holes 102 are formed at the edges of both sides of the channel composite panel 101. Reinforcing blocks 1005 are provided on the inner walls of the stepped through holes 102. An adhesive layer 1004, made of epoxy resin, is provided between the reinforcing blocks 1005 and the inner walls of the stepped through holes 102 to seal the PMI foam layer 1001 and prevent it from being exposed and aging. The stepped through holes 102 have two shapes to accommodate countersunk bolts or screws. The installation state is as follows: Figure 13 As shown, it is installed with a connecting plate 3. After the bolts or screws are installed, their heads do not protrude from the inner wall of the channel, so as not to cause wear to the conveyor belt.
[0046] like Figure 6-9 As shown, the cross-section of the channel composite panel 101 is convex. A boss 103 is provided on the inner side of the channel composite panel 101. A columnar through-hole 104 is provided at the edge of the stepped portion of the channel composite panel 101. An adhesive layer 1004, made of epoxy resin, is provided on the inner wall of the stepped through-hole 102. This adhesive layer 1004 seals the PMI foam layer 1001, preventing it from being exposed and aging. The installation state is as follows. Figure 14 As shown, it needs to cooperate with two connecting plates 3, namely the first connecting plate 31 and the second connecting plate 32. The first connecting plate 31 and the second connecting plate 32 are sandwiched on both sides of the step. The end face of the first connecting plate 31 is flush with the end face of the boss 103 in the channel composite plate 101.
[0047] The carbon fiber layer 1002 covering the outside of the PMI foam layer 1001 is a single piece of carbon fiber, such as... Figure 8 As shown, in the second channel composite panel, the carbon fiber covering the surface of the step section is extended and bent from the carbon fiber in the middle (that is, each layer of carbon fiber is not spliced at the step, but is a whole piece of carbon fiber bent and attached to the PMI foam layer 1001).
[0048] The detection channel uses PMI foam layer 1001 as the core layer, which can improve the rigidity of the channel composite plate 101. At the same time, the density of the core layer is lower than that of carbon fiber, which allows the X-rays to penetrate the detection channel better. The carbon fiber layer 1002 is covered on the surface of PMI foam layer 1001 and the two are bonded together with adhesive, so that the channel composite plate 101 can meet the requirements of rigidity and strength at the same time. In addition, the working surface of carbon fiber layer 1002 (the surface facing the inside of the channel) is covered with aramid fiber, which can enhance the surface wear resistance of the channel composite plate and improve its service life.
[0049] The detection channel is connected to the basic channel 2 at the edge of the channel body 1 by a connecting plate 3 and fasteners. The connecting plate 3 is flat, which can effectively reduce the diameter of the channel without affecting the passage of items or conveyor belts.
[0050] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A detection channel for a security CT scanner, comprising a channel body (1) that is generally channel-shaped, wherein both ends of the channel body (1) are connected to a base channel (2), the base channel (2) is connected to the cavity of the channel body (1), allowing objects to be tested to pass through, characterized in that, The channel body (1) is composed of a channel composite plate (101), and the edge of the channel body (1) is connected to the basic channel (2) through a connecting plate (3) and fasteners; The channel composite plate (101) includes a PMI foam layer (1001), the outer side of which is covered with a carbon fiber layer (1002), and the carbon fiber layer (1002) located inside the channel body (1) is covered with an aramid fiber layer (1003).
2. The detection channel for security CT scan according to claim 1, characterized in that, The main body of the channel (1) is an integral structure composed of channel composite plates (101).
3. The detection channel for security CT scan according to claim 1, characterized in that, The main body of the channel (1) is composed of four channel composite plates (101). The channel composite plates (101) on the corresponding sides are the same size and are symmetrically distributed between each other to form a "U" shaped channel.
4. The detection channel for security CT scan according to claim 1, characterized in that, The main body of the channel (1) is composed of four identical L-shaped channel composite plates (101), which are symmetrically distributed and spliced together to form a "U" shaped channel.
5. A composite panel structure, characterized in that, The detection channel for security CT as described in any one of claims 2-4 is made of a channel composite plate (101) using the composite plate structure. The channel composite plate (101) includes a PMI foam layer (1001), the outer side of which is covered with a carbon fiber layer (1002), and the carbon fiber layer (1002) located on the inner side of the channel body (1) is covered with an aramid fiber layer (1003).
6. The composite plate structure according to claim 5, characterized in that, The PMI foam layer (1001) has a thickness of 3-7 mm, the carbon fiber layer has a thickness of 0.1-0.5 mm, and the aramid fiber layer has a thickness of 0.1-0.5 mm.
7. The composite plate structure according to claim 5, characterized in that, The channel composite plate (101) is flat. The channel composite plate (101) has stepped through holes (102) on both sides of its edges. A reinforcing block (1005) is provided on the inner wall of the stepped through hole (102). An adhesive layer (1004) is provided between the reinforcing block (1005) and the inner wall of the stepped through hole (102).
8. The composite plate structure according to claim 7, characterized in that, The transverse cross section of the channel composite plate (101) is convex. A boss (103) is provided on the inner side of the channel composite plate (101). A columnar through hole (104) of the composite plate is opened at the edge of the stepped part of the channel composite plate (101). An adhesive layer (1004) is provided on the inner wall of the stepped through hole (102) of the composite plate.