A transport container

Abstract

The present invention discloses a transport container, comprising a shielding shell, a bottom component, a top component, a driving component and a bracket, wherein the bracket is arranged in the shielding shell and is used to support a product cup, the driving component is used to drive the bracket to perform lifting movement, the top component comprises a top plate, a cover plate unit and a shielding cover plate, the top plate is fixedly connected to the top of the shielding shell, and an opening is provided on the top plate for the product cup to pass through; the cover plate unit comprises a front cover plate, a rear cover plate and a sliding cover, the front cover plate and the rear cover plate are arranged on the top plate oppositely, a gap is left between the two, the position of the gap corresponds to the opening on the top plate, the sliding cover is embedded in the gap, and the sliding cover can slide back and forth to open the gap; the shielding cover plate is covered on the cover plate unit; the bottom component is used to block the bottom of the shielding shell. The transport container can realize the rapid opening and closing of the top cover, thereby providing convenience for the transport and storage of the product cup.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear industry, and in particular relates to a transport container. Background Art

[0002] With the rapid development of nuclear power, my country's demand for nuclear fuel is also increasing. Certain radioactive materials are necessary materials for the production of nuclear fuel. They are usually stored in product cups. During the preparation of nuclear fuel, these radioactive material product cups need to be transported. The transportation of radioactive materials has a very important impact on the production efficiency, safety and quality of nuclear fuel.

[0003] At present, product cups containing radioactive materials are sealed in transfer containers for transportation. The product cups need to be placed in the transfer container and taken out from the transfer container after reaching the designated location. In the prior art, the cover of the transfer container is generally connected to the cylinder of the transfer container by a fixed connection such as bolt connection. Therefore, when taking out and sealing the product cup, the cover of the transfer container needs to be removed, which complicates the operation process and increases the time the operator is exposed to radioactive rays.

[0004] Secondly, in order to prevent the spread of contamination from radioactive materials, the transfer container needs to have high sealing and shielding properties to ensure safety during the transfer process. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a transport container in view of the above-mentioned deficiencies in the prior art, wherein the transport container can realize rapid opening and closing of the top cover, thereby facilitating the transport and storage of the product cup.

[0006] In order to solve the above problems, the present invention adopts the following technical solutions:

[0007] A transfer container comprises a shielding shell, a bottom component, a top component, a driving component and a bracket, wherein the bracket is arranged in the shielding shell and is used to support a product cup, the driving component is used to drive the bracket to perform lifting movements, the top component comprises a top plate, a cover unit and a shielding cover, the top plate is fixedly connected to the top of the shielding shell, and an opening is provided on the top plate for the product cup to pass through; the cover unit comprises a front cover, a rear cover and a sliding cover, the front cover and the rear cover are arranged on the top plate opposite to each other, a gap is left between the two, the position of the gap corresponds to the opening on the top plate, the sliding cover is embedded in the gap, and the sliding cover can slide back and forth to open the gap; the shielding cover is covered on the cover unit; the bottom component is used to block the bottom of the shielding shell.

[0008] Preferably, there is a middle partition in the shielding shell, and the middle partition divides the shielding shell into an upper chamber and a lower chamber. The driving assembly includes a lift, a screw mechanism, and a guide tube. The screw mechanism includes a screw and a nut connected to the screw. The lift is arranged in the lower chamber of the shielding shell, and the screw is arranged in the upper chamber of the shielding shell. A through hole is opened on the middle partition, and one end of the screw passes through the through hole to be connected with the output end of the lift. The guide tube is sleeved outside the screw, and a guide groove is opened on the guide tube. The guide groove extends along the length direction of the guide tube, and the bracket is connected to the nut through the guide groove. The lift drives the screw to rotate, thereby driving the bracket to rise and fall along the length direction of the guide groove.

[0009] Preferably, the driving assembly also includes a positioning handle and a connecting shaft. The positioning handle is arranged outside the shielding shell. One end of the connecting shaft is connected to the input end of the elevator, and the other end passes through the side of the shielding shell and is connected to the positioning handle. The elevator is driven to move by rotating the positioning handle, thereby causing the nut on the screw to rotate and rise and fall.

[0010] Preferably, the center line of the bracket is parallel to the center line of the shielding shell, the front cover and the rear cover have different sizes, the sliding cover includes a left sliding cover and a right sliding cover, and the shape of the left sliding cover and the right sliding cover after being assembled is adapted to the notch.

[0011] Preferably, handles are respectively provided on the outer sides of the left sliding cover and the right sliding cover.

[0012] Preferably, the shielding shell includes a first shielding layer and a second shielding layer, the first shielding layer is sleeved on the outside of the second shielding layer, the tops of the first shielding layer and the second shielding layer are connected to the top plate, and the bottoms of the first shielding layer and the second shielding layer are connected to the bottom component.

[0013] Preferably, a third shielding layer and a fourth shielding layer are provided in the second shielding layer, the third shielding layer is sleeved on the outside of the fourth shielding layer, the interior of the fourth shielding layer constitutes the upper cavity, the top of the third shielding layer and the fourth shielding layer are connected to the top plate, and the bottom of the third shielding layer and the fourth shielding layer are connected to the middle partition.

[0014] Preferably, a fifth shielding layer and a sixth shielding layer are further provided in the second shielding layer, the fifth shielding layer is sleeved on the outside of the sixth shielding layer, the interior of the sixth shielding layer constitutes the lower cavity, the tops of the fifth shielding layer and the sixth shielding layer are connected to the middle partition, and the bottoms of the fifth shielding layer and the sixth shielding layer are connected to the bottom component.

[0015] Preferably, the bottom component includes a seventh shielding layer, an eighth shielding layer and a bottom fixing plate, the eighth shielding layer is arranged on the seventh shielding layer, and the upper end of the eighth shielding layer is connected to the sixth shielding layer, the upper end of the seventh shielding layer is respectively connected to the fifth shielding layer and the first shielding layer, and the bottom fixing plate is clamped between the second shielding layer and the eighth shielding layer.

[0016] Preferably, the first shielding layer, the fourth shielding layer, the fifth shielding layer and the seventh shielding layer are made of stainless steel; the second shielding layer, the third shielding layer, the sixth shielding layer and the eighth shielding layer are made of polyethylene material.

[0017] In the transfer container of the present invention, the top component can be opened and closed quickly and conveniently, thereby realizing the quick storage and removal of the product cup. In addition, the transfer container has good sealing and shielding properties, which can effectively ensure the safety of the product cup during the transfer process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front view of the transfer container in Example 1 of the present invention;

[0019] Figure 2 is a left side view of the transfer container in Example 1 of the present invention;

[0020] Figure 3 is a top view of the transfer container in Example 1 of the present invention;

[0021] Figure 4 yes Figure 1 AA section view in.

[0022] In the figure: 1-bottom fixing plate, 2-fifth shielding layer, 3-sixth shielding layer, 4-second shielding layer, 5-first shielding layer, 6-middle partition, 7-ninth shielding layer, 8-lifting ear, 9-third shielding layer, 10-fourth shielding layer, 11-top plate, 12-interface shielding plate, 13-shielding cover, 14-handle, 15-left sliding cover, 16-right sliding cover, 17-deep groove ball bearing, 18-retaining ring, 19-bracket, 20-guide tube, 21-lifter, 22-eighth shielding layer, 23-seventh shielding layer, 24-front cover, 25-rear cover, 26-coupling, 27-connecting shaft, 28-sleeve, 29-positioning plate, 30-flange, 31-connecting piece, 32-positioning handle, 33-screw, 34-knob, 35-product cup. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0024] In the description of the present invention, it should be noted that the directions or positional relationships indicated by “upper” and the like are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0025] In the description of the present invention, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "set", "install", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0027] The present invention provides a transport container, comprising a shielding shell, a bottom component, a top component, a driving component and a bracket, wherein the bracket is arranged in the shielding shell and is used to support a product cup, the driving component is used to drive the bracket to perform lifting movements, the top component comprises a top plate, a cover unit and a shielding cover, the top plate is fixedly connected to the top of the shielding shell, and an opening is provided on the top plate for the product cup to pass through; the cover unit comprises a front cover, a rear cover and a sliding cover, the front cover and the rear cover are arranged on the top plate relative to each other, a gap is left between the two, the position of the gap corresponds to the opening on the top plate, the sliding cover is embedded in the gap, and the sliding cover can slide back and forth to open the gap; the shielding cover is covered on the cover unit; the bottom component is used to block the bottom of the shielding shell.

[0028] Example 1

[0029] like Figure 1As shown, this embodiment discloses a transport container, including a shielding shell, a bottom component, a top component, a driving component and a bracket 19. The shielding shell is in the shape of a cylindrical shell. The bracket 19 is arranged in the shielding shell for supporting the product cup 35. The driving component is installed at the bottom of the shielding shell for driving the bracket 19 to perform lifting movements. The top component includes a top plate 11, a cover plate unit and a shielding cover plate 13. The top plate 11 is fixedly connected to the top of the shielding shell, and an opening is provided on the top plate 11. The opening is in the shape of a circle, and its diameter is larger than that of the product cup 35. diameter, so that the product cup 35 can pass smoothly; the cover unit includes a front cover 24, a rear cover 25 and a sliding cover, the front cover 24 and the rear cover 25 are arranged on the top plate 11 relatively, and a gap is left between the two, and the position of the gap corresponds to the opening on the top plate 11. Specifically, the gap is located above the opening on the top plate 11, and the sliding cover is embedded in the gap, and the sliding cover can slide back and forth to open the gap; the shielding cover 13 is covered on the cover unit, which is used to shield and isolate the internal radioactive substances from the outside world, and the bottom component is used to block the bottom of the shielding shell.

[0030] In this embodiment, the top component also includes an interface shielding plate 12, which is arranged between the shielding cover plate 13 and the cover plate unit. The interface shielding plate 12 limits the upward displacement of the left sliding cover 15 and the right sliding cover 16 through threaded connection with the front cover plate 24 and the rear cover plate 25, thereby ensuring the stability of the cover plate unit and serving as a supplementary shield.

[0031] like Figure 2 As shown, the center line of the bracket 19 is parallel to the center line of the shielding shell, and the two are not located on the same straight line, so the sizes of the front cover 24 and the rear cover 25 are set to be different, that is, one large and one small, and the sliding cover includes a left sliding cover 15 and a right sliding cover 16. The shape of the left sliding cover 15 and the right sliding cover 16 after being assembled is adapted to the notch, and a knob 34 is provided at the connection between the left sliding cover 15 and the right sliding cover 16, and the left sliding cover 15 and the right sliding cover 16 can be locked by the knob 34 to prevent them from automatically sliding open during transportation.

[0032] Optionally, handles 14 are respectively provided on the outer sides of the left sliding cover 15 and the right sliding cover 16, and the handles 14 are used to pull the left sliding cover 15 and the right sliding cover 16 to slide along the plane direction where the notch is located to open or close the notch, thereby facilitating the storage and removal of the product cup 35. The left sliding cover 15 and the right sliding cover 16 can slide smoothly between the notches without jamming.

[0033] In this embodiment, there is a middle partition 6 in the shielding shell, which is disc-shaped and embedded in the middle lower height position of the shielding shell, so as to divide the shielding shell into an upper chamber and a lower chamber. The driving assembly includes an elevator 21, a screw mechanism, and a guide tube 20. The screw mechanism includes a screw 33 and a nut connected to the screw 33. The elevator 21 is arranged in the lower chamber of the shielding shell, and the screw 33 is arranged in the upper chamber of the shielding shell. A through hole is opened on the middle partition 6, and one end of the screw 33 passes through the through hole and is connected to the output end of the elevator 21. A deep groove ball bearing 17 is provided on the top plate 11, and a retaining ring 18 is provided inside the deep groove ball bearing 17. The other end of the screw 33 is supported on the deep groove ball bearing 17, so as to ensure the stability of the nut on the screw during the lifting process. The guide tube 20 is sleeved outside the screw 33, and a guide groove is opened on the guide tube 20. The guide groove extends along the length direction of the guide tube 20, and the guide groove is parallel to the length direction of the screw 33.

[0034] Specifically, the bracket 19 includes a sliding plate and a support table. The sliding plate is a flat plate structure, and the support table is a cylindrical structure. The support table is fixedly arranged on the sliding plate. One end of the sliding plate passes through the guide groove and is connected to the nut. The elevator 21 drives the lead screw 33 to rotate, and then drives the product cup 35 to rise and fall along the length direction of the guide groove through the bracket 19.

[0035] like Figure 2 , 3 As shown, the driving assembly also includes a positioning handle 32 and a connecting shaft 27. The positioning handle 32 is arranged outside the shielding shell. Specifically, the connecting shaft 27 is used to connect the elevator 21 and the positioning handle 32. One end of the connecting shaft 27 is connected to the input end of the elevator 21, and the other end passes through the side of the shielding shell and is connected to the positioning handle 32. The elevator 21 is driven to move by the rotation of the positioning handle 32, and the nut on the lead screw 33 is lifted and rotated. From the position point of view, the connecting shaft 27 and the lead screw 33 are perpendicular to each other.

[0036] like Figure 2 , 4 As shown, the drive assembly also includes a positioning plate 29, a coupling 31, a flange 30, a sleeve 28, and a coupling 26. The sleeve 28 is embedded in the hole of the side wall of the shielding shell. One end of the connecting shaft 27 passes through the sleeve 28 and is connected to the elevator 21 through the coupling 26. The other end of the connecting shaft 27 is connected to the positioning handle 32 through the coupling 31. The positioning plate 29 is arranged on the outer surface of the shielding shell and is connected to the sleeve 28. The flange 30 is arranged at the open end of the sleeve 28 connected to the outside.

[0037] Specifically, the positioning plate 29 is used to fix the positioning handle 32. When the bracket 19 rises to a certain height, the positioning handle 32 can be inserted into the positioning hole on the positioning plate 29, so that the bracket 19 is kept at a fixed height.

[0038] like Figure 1 As shown, the shielding shell includes a first shielding layer 5 and a second shielding layer 4, both of which are cylindrical, and the first shielding layer 5 is sleeved on the outside of the second shielding layer 4, the tops of the first shielding layer 5 and the second shielding layer 4 are connected to the top plate 11, and the bottoms of the first shielding layer 5 and the second shielding layer 4 are connected to the bottom assembly. In this embodiment, the first shielding layer 5 is made of stainless steel material, and the second shielding layer 4 is made of polyethylene material. The polyethylene material has a good function of shielding radiation. In addition to having a certain function of shielding radiation, the stainless steel material also has a certain structural strength, which is conducive to ensuring the structural stability and anti-collision performance of the shielding shell.

[0039] like Figure 1 As shown, the second shielding layer 4 is provided with a third shielding layer 9 and a fourth shielding layer 10, both of which are cylindrical, and the third shielding layer 9 is sleeved on the outside of the fourth shielding layer 10. Similarly, in this embodiment, the fourth shielding layer 10 is made of stainless steel material, and the third shielding layer 9 is made of polyethylene material. The tops of the third shielding layer 9 and the fourth shielding layer 10 are connected to the top plate 11, and the bottoms of the third shielding layer 9 and the fourth shielding layer 10 are connected to the middle partition 6. The interior of the fourth shielding layer 10 and the middle partition 6 and the top plate 11 form an upper cavity.

[0040] like Figure 2 As shown, the second shielding layer 4 is also provided with a fifth shielding layer 2 and a sixth shielding layer 3, both of which are cylindrical, and the fifth shielding layer 2 is sleeved on the outside of the sixth shielding layer 3. Similarly, in this embodiment, the fifth shielding layer 2 is made of stainless steel material, and the sixth shielding layer 3 is made of polyethylene material. The tops of the fifth shielding layer 2 and the sixth shielding layer 3 are connected to the middle partition 6, and the bottoms of the fifth shielding layer 2 and the sixth shielding layer 3 are connected to the bottom assembly, and the interior of the sixth shielding layer 3 constitutes a lower cavity.

[0041] like Figure 1 , 2As shown, the bottom component includes a seventh shielding layer 23, an eighth shielding layer 22 and a bottom fixing plate 1, the eighth shielding layer 22 is arranged on the seventh shielding layer 23 and fixed by bolts, and the length of the seventh shielding layer 23 is longer than the eighth shielding layer 22, specifically, the length of the fifth shielding layer 2 is longer than the sixth shielding layer 3, the upper end of the eighth shielding layer 22 is connected to the sixth shielding layer 3, and the upper end of the seventh shielding layer 23 is respectively connected to the fifth shielding layer 2 and the first shielding layer 5. Similarly, in this embodiment, the seventh shielding layer 23 is made of stainless steel material, and the eighth shielding layer 22 is made of polyethylene material. The bottom fixing plate 1 is sandwiched between the second shielding layer 4 and the eighth shielding layer 22, and is fixedly connected to the second shielding layer 4 and the eighth shielding layer 22 by bolts. The first shielding layer 5 is respectively connected to the top plate 11 and the bottom fixing plate 1 by welding.

[0042] In this embodiment, the transport container further includes a ninth shielding layer 7, which is disposed between the second shielding layer 4 and the third shielding layer 9, and the top of the ninth shielding layer 7 is fixedly connected to the top plate 11 by bolts, and the bottom end of the ninth shielding layer 7 is connected to the middle partition plate 6 by bolts.

[0043] In this embodiment, a lifting lug 8 is further provided on the outside of the shielding shell for lifting the transfer container.

[0044] The operation process of the transport container in this embodiment is as follows:

[0045] The transfer container is transferred from the warehouse to the feeding glove box station by a transfer vehicle, and the shielding plug at the bottom of the glove box and the shielding cover 13 at the top of the transfer container are removed.

[0046] Pull the handle 14 to make the left sliding cover 15 and the right sliding cover 16 slide open along the notch.

[0047] The positioning handle 32 is rotated to drive the elevator 21 and the lead screw 33 to rotate, and the nut on the lead screw 33 drives the bracket 19 to rise synchronously, thereby causing the radioactive material product cup 35 to rise.

[0048] Continue to rotate the positioning handle 32 to lift the product cup 35 into the glove box, take out the product cup 35 through the glove hole, then rotate the positioning handle 32 in the opposite direction to lower the bracket 19, and finally close the left and right sliding covers 16 and cover the shielding cover 13.

[0049] The transfer container in this embodiment is very convenient to open and close, and can realize the quick removal and storage of the product cup 35. The transfer container is provided with multiple shielding layers, has good radiation shielding effect and good sealing, which is beneficial to ensure the safety of the product cup 35 during transportation.

[0050] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A transport container, characterized in that: It comprises a shielding shell, a bottom component, a top component, a driving component and a bracket (19), The bracket (19) is arranged in the shielding shell and is used to support the product cup (35). The driving assembly is used to drive the bracket (19) to perform lifting motion. The top assembly comprises a top plate (11), a cover plate unit and a shielding cover plate (13), The top plate (11) is fixedly connected to the top of the shielding shell, and an opening is provided on the top plate (11) for the product cup (35) to pass through; The cover plate unit comprises a front cover plate (24), a rear cover plate (25) and a sliding cover, wherein the front cover plate (24) and the rear cover plate (25) are arranged on the top plate (11) in a manner opposite to each other, and a notch is left between the two, the position of the notch corresponds to the opening on the top plate (11), the sliding cover is embedded in the notch, and the sliding cover can slide forward and backward to open the notch; The shielding cover plate (13) is covered on the cover plate unit; The bottom component is used to seal the bottom of the shielding shell; A middle partition (6) is provided in the shielding shell, and the middle partition (6) divides the shielding shell into an upper cavity and a lower cavity. The driving assembly comprises a lifter (21), a screw mechanism, and a guide tube (20); the screw mechanism comprises a screw (33) and a nut connected to the screw (33); The lifter (21) is arranged in the lower cavity of the shielding shell, the lead screw (33) is arranged in the upper cavity of the shielding shell, a through hole is formed on the middle partition (6), one end of the lead screw (33) passes through the through hole and is connected to the output end of the lifter (21), the guide tube (20) is sleeved outside the lead screw (33), a guide groove is formed on the guide tube (20), the guide groove extends along the length direction of the guide tube (20), the bracket (19) passes through the guide groove and is connected to the nut, The elevator (21) drives the lead screw (33) to rotate, thereby driving the bracket (19) to rise and fall along the length direction of the guide groove.

2. The transport container according to claim 1, characterized in that: The driving assembly further comprises a positioning handle (32) and a connecting shaft (27). The positioning handle (32) is arranged outside the shielding shell, one end of the connecting shaft (27) is connected to the input end of the elevator (21), and the other end passes through the side of the shielding shell and is connected to the positioning handle (32). The positioning handle (32) is rotated to drive the elevator (21) to move, thereby causing the nut on the screw (33) to move up and down.

3. The transport container according to claim 1, characterized in that: The center line of the bracket (19) is parallel to the center line of the shielding shell, the front cover plate (24) and the rear cover plate (25) have different sizes, The sliding cover comprises a left sliding cover (15) and a right sliding cover (16), and the appearance of the left sliding cover (15) and the right sliding cover (16) after being assembled is adapted to the notch.

4. The transport container according to claim 3, characterized in that: Handles (14) are respectively provided on the outer sides of the left sliding cover (15) and the right sliding cover (16).

5. The transport container according to claim 1, characterized in that: The shielding shell comprises a first shielding layer (5) and a second shielding layer (4); the first shielding layer (5) is sleeved on the outside of the second shielding layer (4); the tops of the first shielding layer (5) and the second shielding layer (4) are connected to the top plate (11); and the bottoms of the first shielding layer (5) and the second shielding layer (4) are connected to the bottom component.

6. The transport container according to claim 5, characterized in that: A third shielding layer (9) and a fourth shielding layer (10) are provided in the second shielding layer (4). The third shielding layer (9) is sleeved on the outside of the fourth shielding layer (10), the inside of the fourth shielding layer (10) constitutes the upper cavity, the top of the third shielding layer (9) and the fourth shielding layer (10) are connected to the top plate (11), and the bottom of the third shielding layer (9) and the fourth shielding layer (10) are connected to the middle partition plate (6).

7. The transport container according to claim 6, characterized in that: A fifth shielding layer (2) and a sixth shielding layer (3) are also provided in the second shielding layer (4). The fifth shielding layer (2) is sleeved on the outside of the sixth shielding layer (3), the inside of the sixth shielding layer (3) constitutes the lower cavity, the top of the fifth shielding layer (2) and the sixth shielding layer (3) are connected to the middle partition (6), and the bottom of the fifth shielding layer (2) and the sixth shielding layer (3) are connected to the bottom component.

8. The transport container according to claim 7, characterized in that: The bottom component comprises a seventh shielding layer (23), an eighth shielding layer (22) and a bottom fixing plate (1), The eighth shielding layer (22) is arranged on the seventh shielding layer (23), and the upper end of the eighth shielding layer (22) is connected to the sixth shielding layer (3), and the upper end of the seventh shielding layer (23) is respectively connected to the fifth shielding layer (2) and the first shielding layer (5), The bottom fixing plate (1) is sandwiched between the second shielding layer (4) and the eighth shielding layer (22).

9. The transport container according to claim 8, characterized in that: The first shielding layer (5), the fourth shielding layer (10), the fifth shielding layer (2), and the seventh shielding layer (23) are made of stainless steel; The second shielding layer (4), the third shielding layer (9), the sixth shielding layer (3) and the eighth shielding layer (22) are made of polyethylene material.

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